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FINAL Onsite Remediation Closure Report Former Madera Manufactured Gas Plant Site Madera, California

June 2012 Prepared for PACIFIC GAS AND ELECTRIC COMPANY 3401 Crow Canyon Road San Ramon, California 94583 Prepared by AECOM Technical Services, Inc. 2101 Webster Street, Suite 1900 Oakland, California 94612

i FINAL REMEDIATION CLOSURE REPORT June 2012

Table of Contents

Volume I

Abbreviations and Acronyms .................................................................................................................... x

Acknowledgment and Signature Page ................................................................................................... xiv

Disclaimer .................................................................................................................................................. xv

Executive Summary ................................................................................................................................. xvi

1.0 Introduction ......................................................................................................................................... 1 1.1 OVERVIEW .................................................................................................................................... 1 1.2 SITE HISTORY AND DESCRIPTION ................................................................................................... 1 1.3 INVESTIGATION AND REMEDIATION ACTIVITIES ................................................................................ 2 1.4 PURPOSE OF THE REPORT ............................................................................................................. 2 1.5 REGULATORY FRAMEWORK ............................................................................................................ 3

2.0 Remedial Activities ............................................................................................................................. 6 2.1 OVERVIEW .................................................................................................................................... 6 2.2 PRELIMINARY ACTIVITIES ............................................................................................................... 6

2.2.1 Pre-Excavation Investigations ......................................................................................... 6 2.2.2 Permitting ......................................................................................................................... 7 2.2.3 Site Preparation ............................................................................................................... 7

2.3 SITE DEMOLITION .......................................................................................................................... 7 2.3.1 Monitoring Wells .............................................................................................................. 7 2.3.2 Asphalt and Concrete ...................................................................................................... 8 2.3.3 Fencing ............................................................................................................................ 8 2.3.4 Former Storage Building .................................................................................................. 8 2.3.5 Electrical Disconnection and Power Pole Protection by PG&E ....................................... 8 2.3.6 MGP Related Pipes ......................................................................................................... 9 2.3.7 Former Gas Scrubber ...................................................................................................... 9 2.3.8 Septic Tank ...................................................................................................................... 9 2.3.9 Auto Lift and Associated Cylinders .................................................................................. 9

2.4 EXCAVATION AND BACKFILL ........................................................................................................... 9 2.4.1 Excavation Equipment ..................................................................................................... 9 2.4.2 Excavation Procedures .................................................................................................. 10 2.4.3 Loading of Soil ............................................................................................................... 11 2.4.4 Backfill and Compaction ................................................................................................ 11

2.5 ENVIRONMENTAL CONTROL.......................................................................................................... 12 2.5.1 Overview ........................................................................................................................ 12 2.5.2 Health and Safety .......................................................................................................... 13 2.5.3 Noise Monitoring and Control ........................................................................................ 13

Table of Contents (Continued)

ii FINAL ONSITE REMEDIATION CLOSURE REPORT June 2012

2.5.4 Dust Emissions .............................................................................................................. 13 2.5.5 Air Emissions Monitoring and Control ........................................................................... 14

2.6 RESTORATION ............................................................................................................................. 15 2.7 SUMMARY OF MATERIAL QUANTITIES ............................................................................................ 16

3.0 Onsite Confirmation Sampling and Analyses ................................................................................ 17 3.1 INTRODUCTION ............................................................................................................................ 17 3.2 SUMMARY OF EXCAVATION ACTIVITIES ......................................................................................... 17 3.3 CONFIRMATION SAMPLING AND ANALYSES .................................................................................... 18

3.3.1 Soil ................................................................................................................................. 18 3.3.2 Additional Investigations ................................................................................................ 19

3.4 RISK-BASED EVALUATION OF ONSITE CONFIRMATION SAMPLES .................................................... 20

4.0 Post Remediation Health Risk Assessment ................................................................................... 21 4.1 INTRODUCTION AND OBJECTIVES .................................................................................................. 21 4.2 DATA EVALUATION AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN ................................. 21

4.2.1 Data Evaluation.............................................................................................................. 22 4.2.2 Onsite Soil and Soil Gas ................................................................................................ 22 4.2.3 Selection of Chemicals of Potential Concern ................................................................ 22

4.3 EXPOSURE ASSESSMENT ............................................................................................................. 24 4.3.1 Identification of Potentially Exposed Populations .......................................................... 24 4.3.2 Human Intake Assumptions ........................................................................................... 24 4.3.3 Estimation of Representative Exposure Point Concentrations ...................................... 25

4.4 TOXICITY ASSESSMENT ................................................................................................................ 27 4.4.1 Toxicity Assessment for Carcinogenic Effects ............................................................... 27 4.4.2 Toxicity Assessment for Noncarcinogenic Effects ......................................................... 28 4.4.3 Toxicity Assessment for Lead ........................................................................................ 28

4.5 RISK CHARACTERIZATION ............................................................................................................ 29 4.5.1 Comparison of CPAHs Concentrations in Onsite Soil to Ambient Concentrations ....... 29 4.5.2 Comparison of Arsenic Concentration in Onsite Soil to Ambient Concentrations ......... 30 4.5.3 Estimated Cancer Risk and Noncancer Hazards .......................................................... 31

5.0 Conclusions and Recommendations .............................................................................................. 36 5.1 FINDINGS OF THE POST-REMEDIATION HEALTH RISK ASSESSMENT ................................................ 36 5.2 RECOMMENDATIONS .................................................................................................................... 36

6.0 References ......................................................................................................................................... 37


iii FINAL ONSITE REMEDIATION CLOSURE REPORT June 2012

List of Tables

Table 2-1 Summary of Cleanup Goals

Table 2-2a Summary of Import Soil Analytical Results for PAHs

Table 2-2b Summary of Import Soil Analytical Results for Metals, VOCs and TPH

Table 2-2c Summary of Import Soil Analytical Results for Organochlorine Pesticides, SVOCs, Organophosphorus Compounds, Chlorinated Herbicides, and Asbestos

Table 2-3a Summary of PUF Air Samples Analytical Results for PAHs

Table 2-3b Summary of PM-10 Air Samples Analytical Results for Arsenic and Lead

Table 3-1 Summary of Confirmation Onsite Soil Analytical Results for PAHs and B(a)P Equivalent Concentrations

Table 3-2 Summary of Confirmation Onsite Soil Analytical Results for VOCs and TPH

Table 3-3 Summary of Confirmation Onsite Soil Analytical Results for Metals and Cyanide

Table 3-4 Summary of Soil-Gas Analytical Results for VOCs by TO-15

Table 4-1 Summary of Chemicals Included in the Risk Assessment: Onsite Soil (0-10 feet bgs)

Table 4-2 Summary of Chemicals Included in the Risk Assessment: Soil Gas

Table 4-3 Exposure Parameters

Table 4-4 Equations Used to Calculate Exposure Concentrations and Chronic Daily Intakes: Residential Scenario

Table 4-5 Exposure Point and Predicted Outdoor Air Concentrations for Chemicals of Potential Concern in Onsite Soil: Future Onsite Residential Scenario

Table 4-6 Chemical Properties for Chemicals of Potential Concern

Table 4-7 Carcinogenic and Noncarcinogenic Toxicity Values for Chemicals of Potential Concern

Table 4-8 Summary of Representative Post-Excavation CPAH Data for Onsite Soil (0-10 feet bgs)

Table 4-9 Summary Statistics for Representative Post-Excavation CPAH Dataset for Onsite Soil (0-10 feet bgs)

Table 4-10 Summary Statistics for Northern California CPAH Dataset

Table 4-11 Summary of Representative Post-Excavation Arsenic Data for Onsite Soil (0-10 feet bgs)


iv FINAL ONSITE REMEDIATION CLOSURE REPORT June 2012

Table 4-12 Summary Statistics for Representative Post-Excavation Arsenic Dataset for Onsite Soil (0-10 feet bgs)

Table 4-13 Exposure Concentration and Chronic Daily Intake for Carcinogens in Onsite Soil: Future Onsite Residential Scenario

Table 4-14 Exposure Concentration and Chronic Daily Intake for Noncarcinogens in Onsite Soil: Future Onsite Residential Scenario

Table 4-15 Cancer Risks from Onsite Soil: Future Onsite Residential Scenario

Table 4-16 Noncancer Hazard Indices from Onsite Soil: Future Onsite Residential Scenario

Table 4-17 Risk Evaluation for Lead in Onsite Soil: Future Onsite Residential Scenario

Table 4-18 Vapor Intrusion Cancer Risks and Noncancer Hazard Indices for VOCs in Soil Gas: Future Onsite Residential Scenario

Table 4-19 Outdoor Air Inhalation Cancer Risks and Noncancer Hazard Indices for VOCs in Soil Gas: Future Onsite Residential Scenario

List of Figures

Figure 1-1 Former Madera MGP Site Vicinity Map

Figure 1-2 Former Madera MGP Site Assessor’s Parcel Map

Figure 1-3 Former Madera MGP Site Historical Operations

Figure 1-4 Confirmation Sample Locations

Figure 2-1 Excavation Extent and Depth Contours

Figure 2-2 PUF Sampler Location Map

Figure 3-1 Post-Remediation Samples Showing Onsite B(a)P Equivalent and other select Contaminant Concentrations

Figure 3-2 Post-Remediation Soil Gas Samples Showing Detected VOC Concentrations


v FINAL ONSITE REMEDIATION CLOSURE REPORT June 2012

Volume II

List of Appendices

Appendix A Correspondence

Appendix B Permits

Appendix C Abandonment of Monitoring Wells

Appendix D Site Demolition Weighmaster Certifications and Asbestos Survey

Appendix E Waste Manifest and Weighmaster Certificates – Exported Soil

Appendix F Weighmaster Certificates – Imported Soil

Appendix G Compaction Test Reports

Appendix H Weighmaster Certificates – Imported Aggregate

Appendix I Import Slurry Tickets

Appendix J Analytical Laboratory Reports

Appendix K Quality Assurance Summary Report

Appendix L Geotechnical Soil Sample Results

Appendix M Data Statistical Evaluation

Appendix N Modeling Methodologies

Appendix O Uncertainties in the Risk Assessment

x FINAL REMEDIATION CLOSURE REPORT June 2012

Abbreviations and Acronyms

‘ foot

< less than

> greater than

~ approximately

% percent

µg/dL micrograms per deciliter

µg/kg micrograms per kilogram

µg/L micrograms per liter

µg/m3 microgram per cubic meter

ACM asbestos-containing material

AECOM AECOM Technical Services, Inc.

AETL American Environmental Testing Laboratory

AF attenuation factor

ASTM American Society for Testing and Materials

atm-m3/mol Atmospheres cubic feet per mole

B(a)P benzo(a)pyrene

Bgs below ground surface

BTEX benzene, toluene, ethylbenzene and xylenes

Cal/EPA California Environmental Protection Agency

CDI chronic daily intake

CEQA California Environmental Quality Act

CFR Code of Federal Regulations

CH&SC California Health and Safety Code

COC chain of custody

COPCs chemicals of potential concern

CPAHs carcinogenic polycyclic aromatic hydrocarbons

CRWQCB California Regional Water Quality Control Board

CSF cancer slope factor

DTSC Department of Toxic Substances Control

EC exposure concentration

EPC exposure point concentration

Abbreviations and Acronyms (Continued)

xi FINAL ONSITE REMEDIATION CLOSURE REPORT June 2012

GC/MS gas chromatography/mass spectrometry

g/m2-s grams per squared meter per second

HASP Helath and Safety Plan

HEAST Health Effects Assessment Summary Tables

HERO Office of Human and Ecological Risk

HHRA Human Health Risk Assessment

HI hazard index

HQ hazard quotient

IRIS Integrated Risk Information System

kg/m3 kilogram per cubic meter

MDL method detection limit

mg/kg milligrams per kilogram

mg/kg-day-1 milligram of chemical per kilogram body weight per day

mg/L milligrams per liter

mg/m3 milligrams per cubic meter

MGP manufactured gas plant

mm Hg millimeters of mercury

NA not applicable

NAAQS National Ambient Air Quality Standard

NCP National Contingency Plan

ND non-detect

ng/m3 nanograms per cubic meter

OEHHA Office of Environmental Health Hazard Assessment

PAHs polycyclic aromatic hydrocarbons

PCB polychlorinated biphenyl

PCE tetrachloroethene or perchloroethene

PDR personal dust monitor

PEA Preliminary Endangerment Assessment

PEF particulate emissions factor

PID photoIonization detector

ppm parts per million

Abbreviations and Acronyms (Continued)

xii FINAL ONSITE REMEDIATION CLOSURE REPORT June 2012

PPRTV Provisional Peer Reviewed Toxicity Values

PQL practical quantitation limit

PUF polyurethane foam

QASR Quality Assurance Summary Report

RAW Removal Action Workplan

RBCG Risk-based cleanup goals

RCRA Resource Conservation and Recovery Act

REL reference exposure level

RfC reference concentration

RfD reference dose

RI remedial investigation

RSL Regional Screening Level

STSC Superfund Health Risk Technical Support Center

SVOC semi-volatile organic compound

SWPPP Storm Water Pollution Prevention Program

TF transfer factor

™ trade mark

TPH total petroleum hydrocarbons

TPH-D total petroleum hdrocarbons as diesel

TPH-G total petroleum hydrocarbons as gasoline

TPH-H total petroleum hydrocarbons as heavy hydrocarbons

UCL upper confidence limit

URF unit risk factor

USEPA United States Environmental Protection Agency

UTL Upper tolerance limit

VCA Voluntary Cleanup Agreement

VOCs volatile organic compounds

xiv FINAL ONSITE REMEDIATION CLOSURE REPORT June 2012

Final Onsite Remediation Closure Report Former Madera Manufactured Gas Plant Site

Madera, California

Acknowledgment and Signature Page

This Final Onsite Remediation Closure Report, hereinafter referred to as the “Report,” was prepared by AECOM Technical Services, Inc. (AECOM), for Pacific Gas and Electric Company (PG&E). All site investigation and remediation work was performed under the auspices of the California Department of Toxic Substances Control (DTSC). All project work was performed under the direct supervision of Patricia Sullivan, Project Manager, for PG&E. Luis A. Fraticelli is the Project Manager for AECOM.

June 28, 2012 Luis A. Fraticelli, P.G. Date Project Manager, AECOM.

xv FINAL ONSITE REMEDIATION CLOSURE REPORT June 2012

Disclaimer

This Closure Report (Report) was prepared by AECOM Technical Services, Inc. (AECOM), for the sole use and benefit of Pacific Gas and Electric Company (Client) and for the specific Site known as the Former Madera Manufactured Gas Plant (MGP) site, at corner of Clinton Street and South E Street, located in the city of Madera, California “Site.” Neither this Report, nor any of the information contained herein, shall be used or relied upon for any purpose by any person or entity other than the Client and for the Site.

This Report was prepared based partially on information supplied to AECOM from outside sources and other information which is in the public domain, and partially on the information and data AECOM generated during investigation and remediation of the Site. Documentation for the statements made in this Report is on file either at the Client’s offices or at AECOM’s office located in Oakland, California. AECOM makes no warranty as to the accuracy of statements made by others that are contained in this Report, nor are any other warranties or guarantees, expressed or implied, included or intended in this Report with respect to information supplied by outside sources or conclusions or recommendations substantially based on information supplied by outside sources. This Report has been prepared in accordance with the current generally accepted practices and standards consistent with the level of care and skill exercised under similar circumstances by other professional consultants or firms performing the same or similar services. Since the facts forming the basis for this Report are subject to professional interpretation, differing conclusions could be reached. AECOM does not assume responsibility for the discovery and elimination of hazards that could possibly cause accidents, injuries, or damage unless those hazards were apparent, and should have been discovered, as a result of the services AECOM performed for the Client. This Report represents the best professional judgment of AECOM. However, compliance with submitted recommendations or suggestions does not assure elimination of hazards or the fulfillment of the Client's obligations under local, State, or Federal laws, or any modifications or changes to such laws.

None of the work performed hereunder shall constitute or be represented as a legal opinion of any kind or nature, but shall be a representation of findings of fact from records examined.

xvi FINAL ONSITE REMEDIATION CLOSURE REPORT June 2012

Executive Summary

This Final Onsite Remediation Closure Report (Report) was prepared by AECOM Technical Services, Inc. (AECOM), on behalf of the Pacific Gas and Electric Company (PG&E), for the Former Madera Manufactured Gas Plant (MGP) site (the Site). This Report presents a summary of the soil remediation efforts conducted at the Site in 2011 and 2012. The Report only details the work conducted onsite and does not fully describe any work in the public right of way.

Site History and Description

The former Madera MGP Site is located at corner of Clinton Street and South E Street, Madera, Madera County, California (Figure 1-1). The Site is bounded by Clinton Street (8th Street) to the northwest, 9th Street to the southeast, an unnamed alley to the northeast, and South E Street to the southwest. The property covers approximately 1-acre and is situated on a relatively flat surface which drains toward Clinton and South E Streets. Site elevation is approximately 270 feet above mean sea level (msl).

Beginning in 1913 and until sometime in 1930 the Madera Gas Company operated a MGP facility at the Site. In June 1930, ownership of the Site was transferred to the Southern Counties Gas Company, a predecessor to the Southern California Gas Company. The Site was acquired by PG&E in 1931. The Madera MGP Plant was dismantled between 1931 and 1935 when natural gas was introduced in the area. The current owner/occupant of the Site is PG&E, and the Site is used as an open space storage facility.

Currently, the entire Site is enclosed by a chain-link fence and is mostly covered with crushed rock and some limited asphalt pavement. All the former MGP structures and appurtenances, as well as all other onsite buildings and other features have been removed. The only remaining onsite features are a gas regulating station and light poles.

The Site is located in a commercial use zone. Two single-family houses (one unoccupied) are located across the alley northeast of the Site. Low density residential and service related commercial businesses are located within the vicinity of the Site; high density residential areas are located approximately ¼-mile southwest and to the northeast.

Summary of Site Investigations

Since 1986, several site investigations have been conducted at the Site. The results of these investigations revealed the presence of chemicals commonly found at MGP sites, mainly polycyclic aromatic hydrocarbons (PAHs), metals, total petroleum hydrocarbons (TPH), and volatile organic compounds (VOCs). Following completion of site investigations a human health risk assessment (HHRA) was completed. Based on the HHRA it was determined that the levels of carcinogenic polycyclic aromatic hydrocarbons (CPAHs), arsenic, naphthalene, benzene, ethylbenzene, acenaphthene, benzo(g,h,i)perylene, fluoranthene, pyrene, and/or lead present at certain areas of the Site were above the levels that would be considered safe for future onsite residential use.

Remedial Activities

A detailed evaluation of remedial alternatives was conducted for the Site, as part of the Removal Action Workplan (RAW), prepared by AECOM in 2011 [AECOM, 2011a]. The selected remedial alternative for soil remediation at the site was excavation and disposal. The HHRA identified an initial remediation target of 0.9 milligrams per kilogram (mg/kg) in benzo(a)pyrene (B(a)P) equivalent to reduce the concentrations of CPAHs to ambient-like levels. The HHRA also identified an initial remediation target of 16 mg/kg for arsenic to remediate arsenic concentrations at the Site to ambient-like levels such that the upper bound average (i.e., 95 percent upper confidence level [UCL] of the arithmetic mean concentrations) of post-excavation arsenic concentrations is at or below 6 mg/kg. Moreover, the RAW

xvii FINAL ONSITE REMEDIATION CLOSURE REPORT June 2012

set a target cleanup level for total petroleum hydrocarbons in diesel range (TPH-d) of 4,000 mg/kg. Naphthalene, benzene, ethylbenzene, acenaphthene, benzo(g,h,i)perylene, fluoranthene, pyrene, and lead concentrations above residential risk-based cleanup goals (RBCGs) were collocated with soil which displayed high concentrations of CPAHs; thus, planned removal of CPAHs would remove these constituents to levels below their RBCGs.

Remediation was conducted in July to October 2011, and confirmation soil gas samples were collected in February 2012. In accordance with the RAW [AECOM, 2011a], remediation of the Site was accomplished by excavation and removal of the impacted soil from the accessible areas. The non-hazardous excavated soil was transported to the Forward Landfill in Manteca, California, for disposal. Additionally, non-RCRA hazardous soil (primarily impacted with lead) was transport to Clean Harbor’s Buttonwillow Landfill in Buttonwillow, California for disposal.

A total of 14,820 tons of non-hazardous impacted soil (PAH, VOCs, TPH, and arsenic) were excavated from the onsite and offsite areas and transported to Forward Landfill for disposal. A total of 84 tons of non-RCRA hazardous soil (lead and PAH) were excavated from the onsite and offsite areas and transported to Buttonwillow Landfill for disposal.

During the excavation, confirmation soil samples were collected and analyzed for PAHs and metals. Selected samples were also analyzed for total petroleum hydrocarbons (TPH), and VOCs, as required. Additionally, confirmation soil gas samples, from depths of 5 and 15 feet below ground surface (bgs), were collected approximately three months after the excavation was completed. A post-remediation Human Health Risk Assessment (post-remediation HHRA, Section 4.0) was conducted by Iris Environmental using the confirmation soil data and post-remediation soil gas data.

Conclusions and Recommendations

Remediation activities at the Site were effective in achieving the remedial action goals. The overall objective of the remedial activities was to minimize potential future exposure of humans (onsite workers, residents and visitors) to CPAHs, TPH, naphthalene, benzene, ethylbenzene, acenaphthene, benzo(g,h,i)perylene, fluoranthene, pyrene, lead, and arsenic in soil through inhalation, dermal absorption and/or ingestion.

Remediation activities were successful in reducing CPAHs and arsenic in the onsite soil to concentrations that are similar to ambient levels. Thus, the potential risks from residual CPAHs and arsenic remaining in onsite soil would be no different than the risks posed by ambient levels of CPAHs and arsenic. As such, the residual levels of CPAHs and arsenic remaining in onsite soil are consistent with concentrations that would be considered suitable for future residential use scenarios.

The cumulative potential cancer risks and noncancer hazards posed by all other residual chemicals remaining in onsite soil and soil gas are below levels considered acceptable for future residential populations at the Site. Furthermore, the incremental blood-lead levels estimated for future onsite residential populations are well below the benchmark level of concern for residential populations. As such, the remedial action goals were attained, and the residual levels of chemicals in the onsite soil would be considered safe and protective of future residential land use scenarios.

Based on the successful completion of the onsite soil excavation and the results of the post-remediation HHRA presented in Section 4.0, no further soil removal at the Site would be warranted and no restrictions would be required for future uses. On behalf of PG&E, AECOM requests that a Closure Letter for the Site be issued.

This Report describes work performed within the site boundary, i.e. within the fence line. . A separate report will be submitted to address the remedial actions performed in areas beyond the site boundary.

1 FINAL ONSITE REMEDIATION CLOSURE REPORT June 2012

1.0 Introduction

1.1 Overview

This Final Onsite Remediation Closure Report (Report) was prepared by AECOM Technical Services, Inc. (AECOM), on behalf of the Pacific Gas and Electric Company (PG&E), for the Former Madera Manufactured Gas Plant (MGP) site ("Site"). The Site is located in Madera, California (Figures 1-1 and 1-2). This Report presents a summary of the soil remediation efforts conducted at the Site in 2011 and 2012.

During the remediation in 2011, the impacted soil was removed from the accessible areas of the Site, under the oversight of the Department of Toxic Substances Control (DTSC).

The remediation was conducted by Pivox Consulting Management, Inc. (Pivox) and overseen by AECOM to assure compliance with the Removal Action Workplan (RAW) [AECOM, 2011a]. This Report was prepared to comply in part with the Voluntary Cleanup Agreement (VCA), Docket No. HAS-A 05/06-160, agreed upon by California Environmental Protection Agency, DTSC, and PG&E [DTSC, 2006]. Supporting agencies included the Central Valley Regional Water Quality Control Board and the Madera County Environmental Health Department.

This Report is being submitted to the DTSC for review and approval. The DTSC is authorized to review, evaluate and ultimately approve documents, such as this Report, under the California Health and Safety Code (CH&SC), Chapter 6.8 - Section 25187, which was developed to carry out a removal action in an effective manner that is protective of the public health and environment.

1.2 Site History and Description

The Site is located on an approximately 1-acre parcel at 9th and South E Streets in Madera, Madera County, California (Figure 1-1). The Site is currently recorded as Assessor’s Parcel Number 011-012-008 (Figure 1-2) and is located within a portion of NW1/4, NW1/4, Section 19, Township 11 South, Range 18 East, Mount Diablo Base and Meridian, Madera 7.5 Minute Quadrangle [USGS, 1981].

Beginning in 1913 and until sometime in 1930, the Madera Gas Company operated a MGP facility at the Site. In June 1930, ownership of the Site was transferred to the Southern Counties Gas Company, a predecessor of the Southern California Gas Company. The Site was acquired by PG&E in 1931. The Madera MGP Plant was dismantled between 1931 and 1935 when natural gas was introduced into the area. Based on a Sanborn Map of the Site area [1929, revised in 1950], all the MGP structures, except for the smaller horizontal gas-holder vessels located along the alley (Figure 1-3) were removed.

The Site is operated as an open space storage facility for power poles, transformers, and miscellaneous gas and electrical hardware, and as a field mobilization yard supporting PG&E’s Madera Service Center located on Gateway Drive. Currently, the entire Site is enclosed by a chain-link fence. The Site is mostly covered with crushed rock and limited asphalt pavements. The Site can be accessed through three gates: two along 9th Street and one along Clinton Street. A small building and enclosure area were demolished during site excavation. The only remaining onsite features are a gas regulating station and light poles.

Adjacent to the site along its northwestern perimeter is an unpaved side walk beyond which is Clinton Street (8th Street). Adjacent to the site along its northeast perimeter is an unnamed, unpaved alley. Several utilities run down this alley. Beyond this alley on the north side are two residences (one unoccupied) and on the south side is an automobile shop. Adjacent to the site along its southwestern perimeter is an unpaved side walk beyond which is South E Street and a Southern Pacific railroad spur. Adjacent to the site along its southeastern perimeter is an unpaved side walk beyond which is 9th Street.


1.3 Investigation and Remediation Activities

Several investigations were conducted at the Site to investigate if the historical MGP operations lead to impacts to the Site and the extents of these impacts. These investigations included:

• Limited sample collection and analysis [PG&E’s Department of Engineering Research, 1986];

• Preliminary Endangerment Assessment [Dames and Moore, September, 1991];

• Remedial Investigation/Human Health Risk Assessment [MSE/AECOM Team, June 2008]; and

• Quarterly Groundwater Monitoring [AECOM, 2009-2010].

These investigations were used to evaluate the extent of impacts at the Site and included analysis of soil, groundwater and soil vapor samples. These investigations are summarized in the RI/HHRA [MSE/Earth Tech, 2008].

Based on the investigation results, a RAW [AECOM, 2011a] was prepared to address the remediation of the soils that were impacted with carcinogenic polyaromatic hydrocarbons (CPAHs), arsenic, naphthalene, benzene, ethylbenzene, acenaphthene, benzo(g,h,i)perylene, fluoranthene, pyrene, and/or lead. The RAW recommended the excavation of the soil with concentrations of contaminants of concerns (COCs) above the risk-based clean up goals developed as part of the HHRA.

Groundwater was not retained as a media of concern for the purpose of conducting remediation in accordance with the provisions of the RAW because the VOCs in groundwater are considered to have an offsite source unrelated to historical MGP operations. However, the onsite groundwater monitoring results were considered when determining the locations of post-remediation soil gas survey points.

Residential risk-based cleanup goals (RBCGs) were established based upon data collected during the RI and evaluated in the HHRA. Nine onsite areas were targeted for remediation based upon the established RBCGs. In August through October 2011, the Site was remediated by excavating the soils that were impacted with CPAHs, arsenic, naphthalene, benzene, ethylbenzene, acenaphthene, benzo(g,h,i)perylene, fluoranthene, pyrene, TPH, and/or lead as identified in the RAW. The excavated soil was transported offsite for disposal purposes.

Based on confirmation sampling results, the boundaries of the targeted nine onsite areas were expanded to remove soil above the cleanup goals. In some locations the excavation was extended offsite into the City of Madera Right-of-Way (ROW) along 8th Street, South E Street, and 9th Street as well as into the alley to the east to achieve the cleanup goals. Soil was excavated across most of the Site to depths ranging from 2 feet bgs to 32 feet bgs. A total of 14,904 tons of soil was removed from the Site and replaced with clean imported fill material which meets the criteria established by the DTSC’s fact sheet entitled “Import Advisory, Clean Imported Fill Material” [DTSC, 2001]. Additionally, certain areas were excavated in a slot trench method and filled with cement slurry to maintain the structure integrity of the street side walls. As shown on Figure 1-4, soil confirmation samples were collected throughout the excavation areas.

1.4 Purpose of the Report

The purpose of this Report is to document that the remedial actions proposed in the RAW [AECOM, 2011a], have been successfully implemented at the Site, and that the overall remedial action objectives have been achieved.

The overall remedial action objective for the Site was to minimize potential future exposure of humans (onsite workers, residents and visitors) to CPAHs, TPH, naphthalene, benzene, ethylbenzene, acenaphthene, benzo(g,h,i)perylene, fluoranthene, pyrene, lead, and arsenic in soil through inhalation, dermal absorption and/or ingestion. Based on the post-remediation Human Health Risk Assessment, as outlined in this Report, AECOM believes that the Site no longer presents potential adverse impacts to


human health or to the environment. On behalf of PG&E, AECOM requests a Closure Letter to indicate that the remedial action is complete and the remedial goals have been attained.

1.5 Regulatory Framework

The significant regulatory milestones are listed in the table below. Correspondence relating these milestones is presented in Appendix A.


Chronology of Key Regulatory Events

DATE EVENT

May 5, 1987 A preliminary assessment report summary [PG&E, 1986] was prepared and submitted to the DTSC.

April 1, 1992 Preliminary Endangerment Assessment Report [Dames and Moore, 1991] was submitted to DTSC for review.

May 11, 2006 Pacific Gas and Electric Company entered into a Voluntary Cleanup Agreement (Docket No. HSA-A 05/06-160) [DTSC, 2006] with the DTSC to oversee remedial investigations and cleanup at the Site.

October 2006 MSE submitted an initial Community Profile for DTSC review and approval.

November 2006 Draft Site Characterization Work Plan [MSE/Earth Tech Team, 2006] was prepared and submitted to the DTSC.

February 5, 2007 DTSC provides comments on the Draft Site Characterization Work Plan.

February 26, 2007 Final Remedial Investigation (RI) Work Plan [MSE/Earth Tech Team, 2007a] was prepared and submitted to the DTSC. Note this document was previously titled “Site Characterization Work Plan”.

March 16, 2007 DTSC approves the RI Work Plan.

July 13, 2007 Addendum to Final Remedial Investigation Workplan for groundwater well installation [MSE/Earth Tech Team, 2007b] was prepared and submitted to the DTSC.

July 2007 DTSC approves Addendum to Final RI Work Plan for installation of groundwater monitoring wells.

October 25, 2007 Addendum No. 2 to Final RI Work Plan for soil gas investigation and additional soil borings [MSE/Earth Tech Team, 2007c] was prepared and submitted to the DTSC.

November 9, 2007 DTSC approves Addendum No. 2 to Final RI Work Plan

November 13, 2007 DTSC approved the initial Community Profile.

June 2008 Draft Remedial Investigation Report and Human Health Risk Assessment (RI/HHRA) [MSE/Earth Tech Team, 2008] was prepared and submitted to DTSC.

June 15, 2009 DTSC approved the draft RI/HHRA but requests additional groundwater monitoring. The Draft RI/HRRA document is to be considered as the final RI/HHRA.

June 30, 2009 Groundwater Monitoring Work Plan was submitted for DTSC for review and approval. DTSC did not issue an approval letter for this work plan as all requested elements from June 15, 2009 RI/HHRA approval email were included in this monitoring plan.

November 11, 2009 Draft Removal Action Workplan (RAW) was prepared and submitted to the DTSC.

August 31, 2010 Final Community Profile submitted was submitted for DTSC review.

October 1, 2010 DTSC approved the updated community profile.

December 20, 2010 Draft Final RAW was submitted to DTSC for review prior to review by public.


Chronology of Key Regulatory Events

DATE EVENT

January 26, 2011 The Public Notice and Fact Sheet were publically issued describing the RAW. These documents solicited public comment on the RAW.

January 29, 2011 DTSC approved the Draft Final RAW and directed that it be released for public review.

February 7 to March 8, 2011 The public comment period for the Draft Final RAW is held as outlined in the fact sheet.

March 25, 2011 PG&E submitted the Work Plan for Pre-excavation investigations and waste profiling to DTSC for review [PG&E, 2011].

March 29, 2011 DTSC approves Work Plan for Pre-excavation investigations.

April 13, 2011 Final RAW [AECOM, 2011a] issued.

May 2, 2011 DTSC approved the Final RAW.

May 2, 2011 DTSC issued the CEQA Notice of Exemption to Office of Planning and Research State Clearing House.

May 2011 Draft Remedial Design Implementation Plan (RDIP [AECOM, 2011b]) was issued for DTSC review.

May 26, 2011 DTSC approved the Draft RDIP.

June 3, 2011 Final RDIP [AECOM, 2011c] was issued for public records.

June 20, 2011 Well Abandonment Report for wells MW-MAD-1, MW-MAD-2, and MW-MAD-3 was submitted [AECOM, 2011d] for DTSC review.

June 27, 2011 DTSC approved the Well Abandonment Report for wells MW-MAD-1, MW-MAD-2, and MW-MAD-3.

June 29, 2011 DTSC issued a Work Notice for Cleanup associated with the full scale excavation of the site.

July 25 through October 28, 2011

Full scale excavation of the former Madera MGP site and adjacent areas was conducted by Pivox under observation of AECOM and oversight of DTSC.

September 9, 2011 Work Plan Letter for Additional Soil Sampling [AECOM, 2011e] to address arsenic in public right of way along northwest corner of site was submitted to DTSC for review.

September 12, 2011 DTSC approved the additional soil sampling for arsenic along right of way.

September 20, 2011 Work Plan Letter for Additional Sampling to address deeper TPH contamination in excavation Area 5 [AECOM, 2011f] was submitted to DTSC for review.

September 20, 2011 DTSC approved the additional slant borings to assess deeper contamination with TPH.

January 23, 2012 Post Remediation Soil Gas Investigation Work Plan [AECOM, 2012a] was submitted to the DTSC for review.

February 3, 2012 DTSC approved the Post Remediation Soil Gas Work Plan.

May 2012 Draft Onsite Remediation Closure Report is submitted to DTSC for review.


2.0 Remedial Activities

2.1 Overview

The remedial activities at the Site included excavation of soil impacted by PAHs, volatile organic compounds (VOCs), total petroleum hydrocarbons (TPH), and various metals including arsenic and lead. Mobilization and remediation activities began on July 25, 2011 and were completed on October 28, 2011.

In accordance with the RAW [AECOM, April 2011], the areas with CPAH concentrations, above 0.9 milligrams per kilogram (mg/kg) of benzo(a)pyrene (B(a)P) equivalents were identified for excavation. B(a)P equivalent concentrations are calculated based on the potency equivalency factors of CPAHs, as described in the RAW. Removal of limited areas of elevated arsenic concentrations above the initial excavation target of 16 mg/kg was also specified in the RAW. Removal of arsenic concentrations exceeding 16 mg/kg should reduce site-wide arsenic concentrations to ambient-like levels such that the upper bound average (i.e., 95 percent upper confidence level [UCL] of the arithmetic mean concentrations) of post-excavation arsenic concentrations are at or below 6 mg/kg as required by the RAW. Additionally, the removal of limited areas with elevated concentrations of TPH – Diesel Range (TPH-d) above the preliminary RBCG of 4,000 mg/kg was specified in the RAW.. Naphthalene, benzene, ethylbenzene, acenaphthene, benzo(g,h,i)perylene, fluoranthene, pyrene, and lead concentrations above residential RBCGs were collocated with soil which displayed high concentrations of CPAHs; thus, removal of CPAHs impacted soil would remove these constituents to levels below their RBCGs. Remedial cleanup goals for other contaminants of concern are provided on Table 2-1.

During the excavation activities, confirmation soil samples were collected and submitted to American Environmental Testing Laboratory Inc. (AETL) for chemical analyses. In some cases, the PAH-impacted soil was found in visibly identifiable layers in the field, consisting of discolored soil which extended both laterally and vertically. Removal of the discolored soil generally resulted in removal of PAH-impacted soil. Therefore, in addition to the results of the previous investigations, the excavation was guided by visual observation. If a discrete discolored layer was observed during the excavation, the excavation was extended until the layer was removed. Upon obtaining satisfactory confirmation soil sample results, the excavation limits were terminated, and the excavation was backfilled with clean soil or sand/cement slurry, compacted, and restored. The extent and depth of the excavation are shown on Figure 2-1.

Impacted soil that was classified as non-hazardous, defined by the results of the previous Site investigations, was excavated and transported to Forward Landfill (Class II/III landfill) in Forward, California. Impacted soil that was classified as non-RCRA hazardous was excavated and transported to Clean Harbors, LLC (Class I landfill) in Buttonwillow, California.

2.2 Preliminary Activities

Preliminary activities included pre-excavation investigations, permitting, site preparation, and the demolition/destruction of some site features. Each of these subtasks is discussed in the following subsections.

2.2.1 Pre-Excavation Investigations

Prior to the full-scale excavation, additional delineation/potholing was conducted. As outlined in the Trenching Work Plan [PG&E, 2011], seven trenches were excavated to delineate the transition zone from deeper to shallow excavation and to collect additional samples for waste profiling for full scale excavation. The test trenches were primarily located in the vicinity of the former waste reservoir to delineate the


extents of this reservoir. Some trenches were also used to collect sample for lead analysis to determine if soil for certain areas would be considered as hazardous waste after being excavated. In general, trenches were excavated to a depth of 10 feet bgs and were the width of the single backhoe bucket (approximately 3 feet). Length of trench varied by location. Soil from various depth intervals were collected and analyzed for metals to determine disposition of soil during excavation. Trenches were lined with visqueen, and soil was replaced in the trench pending full-scale excavation of the site.

Additional samples were collected in the northeast corner of the Site and adjacent to the onsite building to delineate arsenic impacted areas. Several samples collected adjacent to the building confirmed that the arsenic contamination has extended beneath the building. The building was removed during site demolition to access the soil beneath the building (see Section 2.3.4).

2.2.2 Permitting

Prior to remediation, the remedial contractor (Pivox) obtained an encroachment permit for traffic control and temporary closure of the eastern alley and surrounding sidewalk areas, a grading permit, and a business license. Copies of the Erosion Control Plan and permits are included in Appendix B. Pivox also contacted Underground Services Alert of Northern California for underground utility locating services and Division of Occupational Safety & Health for excavation and trenching notification.

2.2.3 Site Preparation

Site preparation for the remediation included:

• Marking underground utilities at the Site;

• Erecting temporary fencing and installing a visual barrier on the temporary and existing fence around the perimeter of the work area. A portion of the eastern and southern fence line was affixed with sound panels to mitigate the noise emissions.

• Setting up three air-monitoring stations around the work area, located in the northern, southern and eastern corners of the Site;

• Connecting a water meter to an offsite fire hydrant so that the water could be used for dust and odor control;

• Setting up access and egress paths for equipment;

• Mobilizing construction equipment to the Site;

• Installation of temporary power including power pole and electrical panel;

• Mobilizing a construction trailer, and connecting to the temporary power supply;

• Collecting 24-hour background air samples for PAH, lead, and arsenic analyses; and

• Setting up decontamination stations, work areas, and traffic control.

2.3 Site Demolition

Surface features at the Site, such as asphalt pavement, perimeter fencing, light poles and a storage building were demolished and/or removed. Subsurface features encountered during the excavations included buried concrete structures, underground abandoned piping, a septic tank, hydraulic lift and associated cylinders, a gas scrubber, and abandoned monitoring wells. Demolished and/or removed features are further discussed in Sections 2.3.1 to 2.3.9.

2.3.1 Monitoring Wells

Prior to excavation, three monitoring wells (MW-MAD-1 through MW-MAD-3) were abandoned since


groundwater levels had dropped well below the screened interval of these wells (Figure 1-4). On June 2, 2011, these monitoring wells were abandoned by pressure grouting. A tremie pipe was used to place grout into the well until a depth of 25 feet bgs to limit bubbles in the grout then grout was free poured for the remaining 25 feet to ground surface. Pressure greater than 25 pounds per square inch was then applied so that grout was forced in the well pack. Details of the well abandonment are presented in Appendix C. During remedial excavations, portions of the PVC casings from these wells within the excavation areas were removed and disposed of offsite.

During the excavation activities, three remaining known monitoring wells (MW-MAD-4, MW-MAD-5 and MW-MAD-6) were protected (Figure 1-4). None of these wells were damaged during the excavation activities.

2.3.2 Asphalt and Concrete

Asphalt pavement was removed from a majority of the Site except for a small portion of asphalt in the northern corner of the Site, near well MW-MAD-6 which was not excavated as borings in this area did not exceed cleanup goals. Concrete enclosures in the eastern corner of the Site used for storage of sand and gravel were removed to facilitate excavation of the former waste reservoir. Three concrete driveways were demolished and other concrete debris encountered during excavations were demolished and removed from the Site. A total of approximately 463 tons of asphalt and concrete debris was transported to Triangle Rock Products in Madera (asphalt) and San Joaquin Sand and Gravel (concrete) in Madera for recycling. Copies of the weighmaster certificates, documenting concrete and asphalt disposal, are included in Appendix D.

2.3.3 Fencing

To access impacted soil, approximately 783 linear feet of 6-foot high chain-link fence were removed during remediation. Three rolling gates, one in the northern portion of the Site and two in the southern portion of the Site were also removed. The fence and gates were replaced during Site restoration activities.

2.3.4 Former Storage Building

During onsite excavation activities in the northern area, the existing storage building was demolished to provide access to impacted soil underlying the building. Prior to demolition, RGA Environmental (RGA), Inc. of Emeryville, California, performed a lead and asbestos survey and collected material samples from the existing storage building. Analytical results showed the presence of chrysotile asbestos in the stucco. Analytical results are provided in Appendix D. Based on the samples results, Environmental Resource (ER), a licensed hazardous substance removal contractor, performed abatement of the existing storage building. RGA monitored asbestos air emissions at stations around the perimeter of the abatement. No significant asbestos levels were noted. Pivox subsequently demolished the building and the demolition debris was transported to the Madera County landfill.

2.3.5 Electrical Disconnection and Power Pole Protection by PG&E

Two overhead wires that serviced onsite perimeter lighting were disconnected by PG&E. Five onsite light poles were removed by Pivox, cut to manageable lengths and stockpiled onsite. PG&E representatives removed the pole stockpile and transported the poles to an offsite PG&E yard. A PG&E pole truck held one pole along the eastern site boundary while Pivox removed impacted soil and backfilled around the pole with import soil. Light poles and electrical wires were restored to original conditions at the completion of the project.


2.3.6 MGP Related Pipes

During onsite excavation activities in the southern portion of the Site, a number of subsurface pipes were encountered. The pipes appeared to be associated with the former gas holder and former MGP operations which were located in that area. Approximately 670 linear feet of piping varying in diameter from 3 inches to 11 inches were removed. Selected pipes were surveyed for presence of asbestos-containing materials (ACM) by RGA (Appendix D). The asbestos survey did not indicate the presence of chrysotile asbestos. Onsite piping was transported to a local metal recycler.

2.3.7 Former Gas Scrubber

Excavations in the south-central portion of the Site encountered a concrete container in-filled with bluish-green soil and wood chips. The concrete container was about 5 feet on each side and 5 feet deep. Soil samples were collected from the container and non-hazardous levels of cyanide and lead were detected. Demolition of the gas scrubber and contents were monitored for hydrogen cyanide gas during removal using a BW Technologies GasAlert HCN. Monitoring results indicated levels that were non-detect. The container and container contents were placed in a roll-off bin and were transported offsite as non-hazardous waste. Air monitoring logs for the removal of this gas scrubber are provided in Appendix D.

2.3.8 Septic Tank

Remedial excavations in the northern area of the Site encountered a brick-lined septic tank. The septic tank was approximately 13 feet deep and up to 5 feet in diameter. The surface of the tank was buried by approximately 3 feet of soil and was believed to be unrelated to prior MGP operations. The septic tank was empty and removed by excavation. The bottom of the excavation was sampled and confirmed to be non-hazardous. The excavation was subsequently filled with cement slurry.

2.3.9 Auto Lift and Associated Cylinders

Remedial excavations in the eastern area of the Site in the vicinity of the former MGP auto shop encountered an apparent vehicle lift which consisted of a 1-foot diameter by 10 foot long metal cylinder and 3 small broken metal cylinders. The cylinders were found to be empty of solids or liquids. Subsequently, they were crushed onsite and disposed of at Forward Landfill.

2.4 Excavation and Backfill

2.4.1 Excavation Equipment

The following equipment was used for excavation, backfill, and compaction:

• Excavator, Linkbelt 210

• Excavator, JD 225D LC

• Excavator, Doosan300LC

• Mini-excavator, Takechi TB-135

• Loader, Kawasaki 802V

• Loader, Hyundai HL760-g

• Backhoe, CASE 590 Super N

• Breaker attachment for backhoe

• Bobcat, Skid Steer

• Skip Loader


• Compaction Wheel, Sheep’s Foot attached to loader

• Compaction Wheel attached to excavator

• Vibratory Compactor, Dynapac

• Vibratory Roller, Sunbelt

• Water Truck, Peterbilt 2K

• Street sweeper

• Soil vacuum

• End-dump or transfer trucks for import and export of materials.

2.4.2 Excavation Procedures

Impacted soil was typically removed from an open excavation using an excavator or backhoe. The excavated soil was loaded directly onto trucks, or when necessary, temporarily stockpiled. At the end of the day, the remaining impacted soil stockpile, if any, was covered with visqueen sheeting. Where appropriate, impacted soil exposed in the open excavation area was covered with plastic sheeting at the end of the day to minimize potential emissions. The excavation adjacent to active subsurface utilities or adjacent to sensitive aboveground structures was conducted using a mini-excavator or accomplished by hand. Soil excavation during the remediation was conducted within the guidelines and specifications provided in the Remedial Design Implementation Plan (RDIP) [AECOM, 2011c]. The procedures included the following:

• Prioritizing areas to be excavated to ensure that access and egress were available for other Site activities;

• Developing staging and access paths for equipment to be used during remediation;

• Selecting locations for stockpiles and developing loading procedures;

• Developing dust and odor control procedures to be used at each excavation area;

• Identifying locations for air monitoring stations in addition to the perimeter air monitoring stations; and

• Pre-planning sequencing of slot trenches for stabilization of temporary excavations near streets and structures.

Aggressive dust and odor control measures were applied throughout the remediation period. Upon completion of the excavation, confirmation soil samples were collected and analyzed. If it was determined that further excavation was required, then additional soil was excavated and additional confirmation samples were collected and analyzed. Section 3.0 of this Report provides a detailed discussion of confirmation sampling results.

Petroleum hydrocarbon odors were encountered during excavation in a number of areas around the Site, predominantly in the former wastewater pit location. As planned, extra efforts were implemented to control and monitor the emission of vapors. Odex©, a highly concentrated odor suppressant made by Kuma Corporation, was mixed into the water truck and constantly applied to the soil during excavation using a fire hose and/or a garden hose. Additional odor suppressant application included the addition of Simple Green® additives to the water truck. In some cases, soil with a petroleum odor was directly loaded into trucks for immediate offsite disposal. The excavation was monitored using a photoionization detector (PID) to confirm that VOC concentrations in the worker breathing zone did not exceed action levels set in the Health and Safety Plan (HASP). Additionally, in the area of gas scrubber, a GasAlert HCN was used as bluish-green soil observed in this area indicated that cyanide was present; this meter was not used in other site areas as staining was not observed elsewhere on the site.


Excavation sidewalls greater than 4 feet below ground surface (bgs) were sloped or benched at a minimum of 1:1 (horizontal to vertical) slope. Prior to backfilling, the completed excavation areas were inspected by Moore Twinning Associates (MTA), an independent geotechnical and soil engineering firm located in Fresno, California. The responsibilities of MTA included:

• Observing the bottom of the excavations to verify that the loosened soil was removed and approving placement of the imported fill;

• Conducting compaction tests in accordance with applicable American Society for Testing and Materials (ASTM) methods; and,

• Selecting the number, location, and depth of field density tests.

2.4.2.1 ABC Trenching

Several areas were excavated using the ABC trenching method including sensitive areas such as along the streets and beneath the gas regulator. As part of this method, each trench was excavated to approximately three to six feet wide and 10 feet deep. All trenches were parallel to each other. Excavation started with the first trench designated as “A”. After removal of the impacted soil to the desired depth, confirmation samples were collected from the bottom and the sides and the trench was backfilled with two-sack cement slurry. Then, the second “A” trench (normally six to 12 feet away from the first “A” trench) was excavated and backfilled, as discussed before. Excavation of “B” trenches started after the backfill in the adjacent “A” trench had solidified overnight. Then the excavation of “C” trenches continued accordingly. The ABC trenching method proved to be very effective in areas where deeper excavation was required adjacent to the streets, beneath the gas regulator station and at the deeper TPH-impacted area, where sloping of the excavation was not possible. Use of the two-sack cement slurry eliminated the necessity of compaction of the backfill material; however, the solidified cement slurry backfill is considered rippable if removal is required in the future for other construction purposes. In addition, ABC trenching method helped prevent the collapse of the excavations.

2.4.3 Loading of Soil

Excavated soil was typically either loaded directly into trucks or temporarily stockpiled in a designated area by an excavator and/or loader. Stockpiled soil was loaded into end-dump trucks primarily with a loader and in some cases an excavator.

Soil stockpiles were periodically sprayed with water. The temporary soil stockpiles that remained onsite overnight were covered with visqueen sheeting at the end of each workday. Soil excavation and loading operations were conducted in a manner to reduce the volume of stockpiles remaining overnight.

Excavated PAH, TPH, VOC, arsenic and lead impacted soil that was classified as non-hazardous was profiled and transported, under California non-hazardous waste manifests, to Forward Landfill. A total of approximately 14,820 tons of soil was transported to the Forward Landfill for disposal. Copies of the job summaries, manifests and the weighmaster certificates are included in Appendix E.

Excavated VOC and lead impacted soil that was classified as non-RCRA hazardous waste was profiled and transported, under hazardous waste manifests to Clean Harbors Class I Landfill. A total of approximately 84 tons of soil was transported to Clean Harbors. Copies of the manifests and the weighmaster certificates are included in Appendix E.

2.4.4 Backfill and Compaction

Following the completion of excavation and the testing of confirmation samples, the excavation areas were backfilled with slurry or soil. The soil backfill consisted of imported crushed quarry fines from Cemex Quarry, located in Friant, California. Weighmaster certificates for imported soil are included in Appendix F. Clean backfill was placed within the excavation directly from the transport trucks. As discussed later, the backfill soil was sampled and analyzed prior to placing it into the excavation to assure


that the soil was clean. The backfill soil was spread and compacted using the front-end loader or compaction wheel attached to the excavator. Water was applied to the backfill using handheld hoses or the water truck.

Compaction testing was performed periodically by MTA, at locations and depths selected by MTA. The compaction tests met backfill densities of 90 percent or better and 95 percent or better in the upper 1 foot beneath the driveway approaches. A total of 202 compaction tests were performed on the import soil. Copies of the compaction test results are included in Appendix G. A total of approximately 11,773 tons of clean backfill soil was placed in the excavation during the remediation.

In order to verify that the backfill soil imported to the Site was clean, representative soil samples were collected and analyzed. Soil samples were collected by Pivox prior to importing the fill soil to the Site and by AECOM during the backfill operations. Soil samples were collected by the direct insertion of a laboratory-supplied, glass sample jar. The jars were filled and sealed with threaded, Teflon®-lined lids. The samples were appropriately labeled and stored on ice in a cooler until delivered under chain of custody to the analytical laboratory.

Initially, one sample (Fraint-QS-1) was collected from the intended import soil at the quarry by Pivox and analyzed for the following compounds: TPH in gasoline, diesel and heavy ranges (TPH-G/D/H) by United States Environmental Protection Agency (USEPA) Method 8015 (Modified); VOCs by USEPA Method 8260B; semi-volatile organic compounds (SVOCs) by USEPA Method 8270B; polychlorinated biphenyls (PCBs) by USEPA Method 8082; organochlorine pesticides by USEPA Method 8081A, organophosophorus compounds by USEPA method 8141A, asbestos by USEPA Method 600R-93/116; metals by USEPA Method 6010B/7000 and PAHs [USEPA Method 8310] (Tables 2-2a through 2-2c). Additional samples were collected by AECOM as the import soil was delivered to the Site and submitted to AETL for chemical analysis, under chain of custody procedures. As summarized in Tables 2-2a and 2-2b, the number of samples and analyzed compounds included: 15 samples for TPH-G/D/H, 15 samples for VOCs, 15 samples for metals, and 15 samples for PAHs [USEPA Method 8310]. The analytical laboratory reports for import backfill soil are included in Appendix J.

After fill placement and compaction, the restoration was completed by grading the fill area to 6-inches minus previous existing grade and covering it with a geosynthetic fabric. Tencate Mirafi 500X was placed over the backfilled areas of the Site at approximately 6-inches below finish surface. The edges of the fabric were overlapped a minimum of 1-foot. Six inches of Class II aggregate base, imported from San Joaquin Sand and Gravel, was placed and compacted to better than 90% compaction. A total of approximately 1,870 tons of Class II aggregate base was placed. The final grade generally matched the original ground level at the Site. Weighmaster certificates for the imported aggregate are presented in Appendix H.

2.5 Environmental Control

2.5.1 Overview

Safety and protection of the general public and the environment were given the highest priority when performing the remedial activities. The environmental measures implemented at the Site included the following:

• Implementation of the Site-Specific Health and Safety Plan;

• Noise monitoring and control,

• Dust monitoring and control;

• Air emissions monitoring and control, and

• Traffic Control


Data generated as a result of the implementation of the above measures were recorded daily. Copies of the daily field logs, tailgate safety meetings, and dust and air emission monitoring records are kept on file at the AECOM Oakland, California, office, Pivox Corporation office in Irvine, California and at PG&E’s office in San Ramon, California.

Each of these measures is addressed in the following sections.

2.5.2 Health and Safety

Health and safety procedures provided in the Site-Specific Health and Safety Plan (HASP), prepared for the Site as part of the RAW and adopted by Pivox Corporation and AECOM, were implemented during soil remediation activities. The HASP was approved by the DTSC as part of the RAW. Tailgate safety meetings were held each morning prior to the initiation of field activities. Job Safety Analysis (JSA) cards were completed for each field activity on each day by the remediation contractor. Additional meetings were held by the remediation contractor’s Health and Safety Officer to inform the onsite crew of modifications in procedures, when necessary. No health and safety incidents were reported or recorded during remediation and Site restoration activities.

2.5.3 Noise Monitoring and Control

AECOM personnel conducted periodic noise monitoring, using a Casella CEL-350 noise dosimeter, at the Site perimeter. The data were recorded in daily logs. In addition, the remediation contractor’s Health and Safety Officer continuously monitored various health and safety elements, including noise monitoring, during excavation and loading activities.

To reduce the noise level during remediation operations, the excavation equipment used at the Site was medium sized and was properly and routinely maintained such that the noise levels were relatively low. During remediation, equipment operation was generally limited to the hours of 7:00 A.M. to 4:00 P.M., Monday through Friday. Occasional non-equipment based activities were conducted from 6:00 A.M. to 7:00 A.M. and 4:00 P.M. to 6:00 P.M. during weekdays. The occasional activities included general equipment inspections and fueling, Site cleaning, soil sampling, engineering measurements, air sampling, project and tailgate safety meetings, and similar low-profile activities.

2.5.4 Dust Emissions

AECOM conducted periodic real-time perimeter dust monitoring with a Data Ram – PDR (personal dust monitor) 1000AN dust monitor. The dust monitor was used in multiple locations so as to accurately measure instantaneous levels and time-weighted averages. Measurements of dust levels were recorded periodically during excavation and loading.

Dust mitigation measures were implemented based on the results of the monitoring. Measures implemented were as follows:

• Exposed soil surfaces, excavation and backfilling areas, and soil stockpiles were frequently sprayed with water;

• Exposed pavement surfaces subject to construction or other traffic were swept regularly and washed down periodically to avoid build-up of dirt and soil deposits;

• The trucks and construction equipment traveling onsite were kept at speeds less than 5 miles per hour; and,

• Temporary soil stockpiles left onsite overnight were covered with visqueen.

In addition, the remediation contractor’s Health and Safety Officer continuously monitored various health and safety elements, including dust emissions, during excavation and loading activities.


2.5.5 Air Emissions Monitoring and Control

2.5.5.1 Monitoring

In addition to real-time dust monitoring, continuous monitoring for PAHs was conducted with the use of high-volume samplers equipped with polyurethane foam sample media and quartz-fiber filters (PUF monitors). Arsenic and lead particulates were monitored utilizing high-volume samplers equipped with quartz-fiber filters (PM-10 monitors). During remediation, the prevailing wind direction was generally from the north-northwest. Four PUF monitors and four PM-10 monitors were used; one positioned at the northern corner (generally upwind) near the closest residential receptor, one at the southern corner along the fence line and two in the downwind eastern corner (one for duplicate sampling), near the existing auto-shop. Locations of the PUF and PM-10 samplers are shown on Figure 2-2.

A total of 120 PUF samples and 113 PM-10 samples were collected during the course of the remediation. These included 3 samples per day for 54 excavation days, 9 duplicate samples and 3 background samples before excavation began. PUF samples were analyzed for PAHs, using USEPA Method TO-13 and PM-10 samples were analyzed for arsenic and lead by 6010B. Each sample represented approximately 24 hours of continuous sampling. On July 29, 2011, the first set of three PUF and PM-10 samples was collected to establish background levels. The PUF and PM-10 samplers for active remediation started on August 1, 2011, and were collected on a daily basis during the excavation period. The results of the PUF and PM-10 samples are summarized in Tables 2-3a and 2-3b respectively and laboratory reports are included in Appendix J. Downwind concentrations were generally below or consistent with upwind concentrations.

2.5.5.1.1 PAHs

PAH air emission concentrations were compared to baseline levels collected on July 29, 2011 and November 2011 USEPA Residential and Industrial Air Regional Screening Levels (RSLs) where available. PAH air emission results are presented in Table 2-3a.

Baseline concentrations varied by compound but were generally low except for naphthalene. Baseline concentrations of naphthalene ranged from 36.4 nanograms per cubic meter (ng/m3) to 111 ng/m3. It should be noted that the baseline naphthalene concentration of 111 ng/m3 at Station PUF 3 exceeded the Residential RSL (72 ng/m3) but not the Industrial RSL (360 ng/m3) indicating that ambient naphthalene levels may be high in the general site area possibly due to industrial activities in the area. Baseline concentrations of benzo(a)pyrene ranged from non-detect to 0.109 ng/m3; these concentrations are below the Residential RSL for benzo(a)pyrene of 0.87 ng/m3. All other PAHs were below their respective RSLs during the baseline sampling.

A total of 120 air samples for PAHs were collected during the excavation. Air sampling results for naphthalene ranged from 17.1 ng/m3 to 9,860 ng/m3. Most sample concentrations were below, consistent with, or slightly exceeded baseline sample concentrations. Among the collected samples, 33 of the 120 samples exceeded both the Residential RSL and the baseline concentrations for naphthalene; while 23 of the 120 samples also exceeded the Industrial RSL for naphthalene. Residential RSLs are based upon a 30-year exposure and Industrial RSLs are based on a 10-year exposure so slightly exceeding these RSLs for a limited time during the excavation is considered acceptable.

Air sampling results for benzo(a)pyrene ranged from non-detect to 2.5 ng/m3. Most sample concentrations were below, consistent with, or slightly above baseline sample concentrations. Seven of the 120 samples exceeded the baseline sampling concentration and the Residential RSL for benzo(a)pyrene of 0.87 ng/m3. No sample collected exceeded the Industrial RSL for benzo(a)pyrene of 110 ng/m3. Residential RSL are based upon a 30-year exposure scenario so slightly exceeding the RSL for a limited time during the excavation is considered acceptable.

No other detected PAH concentrations in air samples exceeded their respective Residential or Industrial RSL.


2.5.5.1.2 Arsenic

Arsenic air emissions were compared to the baselines levels collected on July 29, 2011 as well as November 2011 RSLs of 0.57 nanograms per cubic meter (ng/m3) and Industrial RSL of 2.9 ng/m3

[USEPA, 2011]. Arsenic concentrations are presented on Table 2-3b. Baseline levels of arsenic were non-detect at all monitoring stations.

Arsenic concentrations collected during the excavation ranged from non-detect to 0.97 ng/m3. In general, most samples were consistent with or slightly above the baseline arsenic levels collected on July 29, 2011. 15 of the 113 PM-10 samples slightly exceeded the Residential RSL for arsenic. Residential RSL are based upon a 30-year exposure scenario so slightly exceeding the RSL for a limited time during the excavation is considered acceptable. One sample collected on September 28, 2011 exceeded the Industrial RSL; however this sample result was rejected due to the unacceptably small sample volume.

2.5.5.1.3 Lead

Lead air emissions were compared to the baselines levels collected on July 29, 2011 as well as the National Ambient Air Quality Standard (NAAQS) for lead of 150 ng/m3 [USEPA, 2008]. Lead concentrations are presented on Table 2-3b. Baseline levels of lead ranged from 0.207 ng/m3 at Station PM-10 1 to 2.34 ng/m3 at Station PM-10 2.

Lead concentrations collected during excavation ranged from non-detect to 66.7 ng/m3. In general, most samples were below or consistent with the baseline samples collected on July 29, 2011. However, 50 of the 113 samples exceeded the baseline levels collected on July 29, 2011. No samples collected during the excavation exceeded the NAAQS for lead. One sample collected on September 28, 2011 was rejected due to the extremely small sample volume.

2.5.5.2 Emission Controls

Due to the physical characteristics of PAHs and fuel components, the potential for both airborne dust emissions and VOCs were anticipated. By controlling the dust with the procedures discussed above, the emissions of airborne chemicals were significantly reduced. The water spray used to control dust also significantly reduced the emissions of potential volatiles that may have been present in the soil. In addition, loading and export of impacted soil on a routine basis minimized soil stockpiling, which reduced potential emissions of volatile compounds.

For excavated soil and open excavations that exhibited odors, odor suppressants such as Simple Green® were added as necessary to the water truck and were sprayed on the exposed excavation surfaces and on the excavated soil. Monitoring of the Site perimeter and excavations was conducted periodically using a PID for VOCs. The PID was calibrated routinely according to the manufacturer's specifications. No elevated readings were recorded during the remediation of the Site.

2.6 Restoration

After backfilling and compaction, the excavated areas were graded and covered with a geosynthetic fabric (Tencate Mirafi 500X). The geosynthetic fabric was placed over excavation areas of the site at approximately 6-inches below finish surface. The edges of the fabric were overlapped a minimum of 1-foot. The Site restoration was completed with a 6-inch layer of Class II aggregate base, imported from the San Joaquin Sand and Gravel, for dust control purposes. The final grade generally matched the original ground level at the Site. Surface completions for monitoring wells MW-MAD-04 and MW-MAD-05 were made to match the final ground surface. Monitoring well MW-MAD-06 was undisturbed and did not require any further surface restoration.

During the excavation of impacted offsite soil, approximately 725 linear feet of 6-foot high chain link fence and attached barbed-wire were removed. Also, 58 linear feet of 6-feet high chain link interior fence surrounding the gas regulator station was removed. Following soil removal and backfilling, three concrete


driveway aprons were replaced. Fencing was replaced to match the pre-existing fence and three swinging gates were restored to original conditions. One swinging gate is located adjacent to Clinton Street along the northern boundary of the Site and the other two gates are located along the southern boundary of the Site adjacent to 9th Street. The gates are made 13 feet long double swinging with a 26 feet wide opening.

2.7 Summary of Material Quantities

Quantities of the impacted soil exported from the Site, clean backfill imported to the Site, cement slurry used at the Site, and recycled waste materials (asphalt and concrete) exported from the Site are listed in the table below.

Material Quantities

Description Source/Destination Approximate Quantity

Total Non-Hazardous Exported Soil Forward Landfill in Forward, CA 14,820 tons

Total Non RCRA-Hazardous Exported Soil Clean Harbors, LLC in Buttonwillow, CA 84 tons

Imported Soil Cemex Quarry in Friant, CA 11,773 tons

Imported Class II Aggregate Base San Joaquin Sand and Gravel in Madera, CA 1,870 tons

2-Sack Cement-Sand Slurry Builders Concrete, Inc. in Fresno, CA 1,397 cubic yards

Exported Recyclable Waste (asphalt and concrete)

Triangle Rock Products, Inc. in Madera, CA (asphalt) San Joaquin Sand and Gravel in Madera, CA

463 tons


3.0 Onsite Confirmation Sampling and Analyses

3.1 Introduction

The overall remedial action objective for the Site was to minimize potential future exposure of humans (onsite workers, residents and visitors) to CPAHs, TPH, naphthalene, benzene, ethylbenzene, acenaphthene, benzo(g,h,i)perylene, fluoranthene, pyrene, lead, and arsenic in soil through inhalation, dermal absorption and/or ingestion The remedial goal was to reduce the residual concentrations of contaminants at the Site to levels that would require no land use restrictions (i.e., to a point that the area could be used for residential purposes).

During the course of the onsite remediation, offsite areas to the north, west and east of the Site were also remediated. A summary of offsite remediation will be submitted under a separate cover.

Following excavation, confirmation soil samples were collected and analyzed for PAHs, metals and select samples were also analyzed for TPH, VOCs and cyanide. The concentrations of CPAHs were converted into B(a)P equivalent concentrations using the potency equivalency factors shown in the table below.

Factors to Calculate CPAH expressed in Benzo(a)Pyrene Equivalent Concentration

Compound Potency Equivalency Factor(a)

Benzo(a)pyrene 1.0

Benzo(a)anthracene 0.1

Benzo(b)fluoranthene 0.1

Benzo(k)fluoranthene 0.1

Chrysene 0.01

Dibenzo(a,h)anthracene 0.34

Indeno(1,2,3-c,d)pyrene 0.1

(a) Cal/EPA, 1994a Appendix 1 Using the results obtained from the remediation confirmation sampling, combined with previous soil sampling results representing the in-place soil, a post- remediation HHRA was conducted and is included in Section 4 of this report. . The purpose of the post-remediation HHRA is to confirm that the remediation activities completed were successful in attaining the remedial goal for the Site.

3.2 Summary of Excavation Activities

A combination of previous soil analytical results and visual observations during remediation were used to direct the excavations at the Site. In areas where confirmation samples detected elevated results or visual observations showed impacted soil extending beyond the excavated area, the area was further excavated, if possible, and additional confirmation samples were collected. Planned excavations extended in some areas beyond what was originally proposed in the RAW [AECOM, April 2011a]. In addition to the soil excavated onsite, some excavations extended offsite. Reporting of these offsite areas will be provided as a separate report

Figure 2-1 presents the excavation contours, and Figure 1-4 shows the locations of the confirmation soil samples and the samples collected during the site investigations. Figure 3-1 shows the location, depth,


B(a)P equivalent, select VOC, TPH, arsenic and lead concentrations for samples representing soil left in-place following remediation. These include both confirmation soil samples collected by AECOM during remediation activities and soil samples collected during earlier work.

The soil samples that were initially collected as confirmation soil samples but were subsequently removed during this remediation work are not plotted but are included in Appendix J for reference.

3.3 Confirmation Sampling and Analyses

The primary objective of the confirmation sampling program was to characterize the residual levels of PAHs, arsenic, lead, TPH, and VOCs that remain onsite. Confirmation sampling was conducted in general accordance with the approved RAW [AECOM, 2011a] and the Post-Remediation Soil Gas Work Plan [AECOM, 2012]). These documents describe the protocol and specifications for sample collection, processing, detection limits, holding times and appropriate documentation.

3.3.1 Soil

The confirmation soil sampling program was comprised of a systematic triangular grid sampling pattern for samples to be collected from the bottom of the excavation. For collection of an adequate number of samples for the Site, the spacing between the sampling points was approximately 30 feet. The triangular grid was supplemented, as necessary, to obtain adequate coverage from the bottom of each excavation area. Excavation sidewall samples were collected at horizontal intervals of approximately 20 feet to 30 feet to confirm that the horizontal boundaries of the impacted soil had been adequately defined and removed. At each wall locations, several depth intervals were collected to facilitate targeted waste removal. The horizontal spacing intervals were considered to be more than sufficient to provide the necessary statistical power to characterize the residual CPAH concentrations remaining at the Site.

Soil samples from the bottom of the excavation areas were generally collected by the direct insertion of laboratory-supplied, 4-ounce glass sample jars into the soil. When necessary, the soil was first slightly dislodged with a decontaminated shovel, hand-auger or excavator bucket.

Excavation sidewall samples were collected by methods utilizing either decontaminated shovel, hand-auger or excavator bucket. In areas with no remaining evidence of impacted soil, sidewall samples for PAH analyses were collected by direct insertion into laboratory-supplied 4-ounce glass jars, along a typically 1.5-foot interval of the exposed excavation sidewall. In this Report, these samples are referred to as interval samples. This process was repeated to sample the entire vertical interval of the sidewall. For example, if the depth of the excavation was 5 feet, three interval samples were collected from the sidewall to represent the top 2 feet, the middle 2 to 3.5 feet and the lower 3.5 to 5-foot intervals. In areas that a discolored layer had existed and was subsequently removed, a discrete sample was also collected at the same depth from the sidewall, in addition to the interval samples.

Sample jars were filled fully with soil and sealed with threaded, Teflon®-lined lids. The samples were appropriately labeled, placed in re-sealable plastic bags, and stored on ice in a cooler until being delivered to the analytical laboratory.

Soil samples for VOC analysis were collected from the undisturbed soil in accordance with USEPA SW-846, Method 5035. An EasyDraw Syringe™ and PowerStop Handle™ were used to collect 5-gram soil cores which were transferred to pre-weighed 40 milliliter VOA vials in the field. Four soil cores were collected at each sample location; two were placed in VOA vials preserved with sodium bisulfate for potentially low level (<200 µg/kg) VOC analysis, one was placed in a VOA vial preserved with methanol for potentially high level (>200 µg/kg) VOC analysis, and one was placed in a blank VOA vial with no preservative for either low level or high level analysis as needed by the laboratory. A new EasyDraw Syringe™ was used at each sample location and discarded after each sample had been collected.


Soil samples collected from the Site were labeled and submitted under chain of custody to AETL, a California-certified analytical laboratory based in Burbank, California. Copies of the analytical laboratory reports for confirmation soil samples are included in Appendix J. A Quality Assurance Summary Report (QASR) was completed in accordance to the Madera QAPP. The QASR is presented in Appendix K.

Confirmation soil samples collected from the Site were analyzed for PAHs by USEPA Method 8310 and metals by USEPA 6010B. The results of onsite confirmation sample analyses for PAHs are reported in B(a)P equivalent concentrations and are listed in Table 3-1. Samples from selected areas, including the former wastewater pit were analyzed for TPH by USEPA Method 8015 (modified) and VOCs including BTEX by USEPA Method 8260B. In addition, in areas that PID measurements were recorded and/or hydrocarbon odors were detected, additional samples were collected for VOC and TPH analysis. The TPH and VOCs results are summarized in Table 3-2. Analytical results for metals including arsenic and lead analyses are summarized in Table 3-3. Samples from selected areas were analyzed for cyanide by USEPA Method 9010B. The cyanide results are also summarized in Table 3-3.

Figure 3-1, presents the locations and depths of contaminant of concern, including CPAH concentrations (in B(a)P equivalents), arsenic, lead, detected VOCs, and TPH concentrations, for samples representing soil left in place. In general, concentrations left in place on site are below the RBCG developed in the RAW [AECOM, 2011a].

3.3.2 Additional Investigations

Following the completion of the soil excavation activities, additional geotechnical soil and soil gas samples were collected at the Site to support the post-remediation HHRA. These additional sampling activities are discussed in the following sections:

3.3.2.1 Geotechnical Sampling

Six additional soil samples (V-A2-V1-1-2.5, V-A2-V1-13.5-15, V-C3-V1-1-2.5, V-C3-V1-13.5-15, V-C4-V1-1-2.5, and V-C4-V1-13.5-1) were collected by AECOM, Ninyo & Moore, and Penecore personnel for geotechnical testing, at locations shown on Figure 3-4. All samples were collected using a split spoon sampler as part of the installation of the soil gas wells. Samples at 1-2.5 bgs were from the backfill material while samples at 13.5-15 feet were collected from the native material.

All samples were tested for

• Density and soil moisture by ASTM D2937,

• Organic carbon content by ASTM 2974,

• Effective permeability by ASTM D5084 for fine-grained soils or ASTM D2434 for sandy soils,

• Porosity by Phase Relationships, and

• Grain-size distribution by ASTM D422.

A complete report of the geotechnical testing and results are shown in Appendix L.

The soil physical properties reported for samples collected from 1-2.5 feet bgs are considered representative of the soil physical properties for the soil backfill material placed across the Site. The imported soil was classified as silty sand (Appendix L).

Samples from 13.5 to 15 feet bgs were classified as silty sand. The soil physical properties reported for samples collected from 13.5 to 15 feet bgs are considered representative of native materials. As discussed in the RI/HHRA, soils beneath the Site were typically silty sand or sandy silt from 1 to 18 feet bgs. AECOM personnel were on site throughout the excavation and removal of native soils and observed silty sand and sandy silt with occasional silts and clays in all excavation sidewalls and bottoms in the areas of soil removal.


The geotechnical results are used in the HHRA (Section 4) to determine input parameters for the vapor intrusion model..

3.3.2.2 Soil Gas Sampling

A post-remediation soil gas survey was performed for use in the post-remediation HHRA. The post-remediation soil gas survey was performed approximately 3 months following completion of the site remediation in order to allow the site soils to reach equilibrium conditions. Figure 3-2 shows the locations of the post-remediation soil gas investigation points. The results of the soil gas sampling are summarized in Table 3-4. Soil gas sample locations and collection procedures followed the DTSC-approved Post-Remediation Soil Gas Work Plan [AECOM, 2012].

The post-remediation soil gas sampling locations were selected on authoritative “biased” basis. Authoritative or biased sampling was conducted adjacent to previous soil, groundwater, or soil gas sampling location. The main purpose of the authoritative “biased” samples was to investigate the potential presence, extent, and concentrations of VOCs present in soil gas. The soil gas survey generally included the following tasks:

• Install double-completion semi-permanent soil gas probes at 5 and 15 feet bgs;

• Allow the soil gas probes at least 48 hours to equilibrate;

• Collect soil gas samples in SUMMA® canisters from each semi-permanent soil gas probe; and

• Submit soil gas samples to a State of California-certified laboratory for analysis by EPA Method TO-15 for VOCs including naphthalene and by ASTM D-1946 for helium. Analyze only 10% of the samples for helium.

In addition to collecting primary soil gas samples as discussed above, one duplicate split-sample was collected in a SUMMA® canister for every 10 samples collected (approximately 10 percent of the total samples) and sent to a State Certified lab. The duplicate samples were collected using a splitter located upgradient of the flow controller, with separate sampling tubes connecting the splitter to two Summa® canisters.

A total of 43 soil gas samples (39 primary and four duplicate soil gas samples) were collected from the 20 sampling locations. A sample could not be obtained from 15 feet bgs at location V-C5-V1 due to water in the sampling train. All samples were analyzed for VOCs by modified EPA Method TO-15. Additionally, four samples were analyzed for helium by ASTM D-1946.

In general, the concentrations of VOCs detected were low and sporadic. A discussion on the post-remediation soil gas results is presented in the post-remediation HHRA in Section 4. Laboratory reports for the soil gas sampling are provided in Appendix J.

3.4 Risk-Based Evaluation of Onsite Confirmation Samples

All the analytical results of the samples representing the in-place soil and soil gas at the Site were used to conduct a post-remediation HHRA, as presented in Section 4.0 of this Report. The post-remediation HHRA was conducted by Iris Environmental to confirm that the onsite remediation activities have been successful in attaining the remedial action goal for the Site.


4.0 Post Remediation Health Risk Assessment

4.1 Introduction and Objectives

This section of the report describes the post-remediation human health risk assessment (HHRA) conducted to document the overall effectiveness of the remediation activities in restoring the Site to a condition that is protective of human health and the environment.

As previously stated in the RAW [AECOM, 2011a], the overall remedial action objective for the Site was to minimize potential future exposure of humans (onsite residents, workers, or visitors) via inhalation, dermal absorption and/or ingestion to CPAHs, TPH, naphthalene, benzene, ethylbenzene, acenaphthene, benzo(g,h,i)perylene, fluoranthene, pyrene, lead, and arsenic in soil through inhalation, dermal absorption and/or ingestion. The overall goal was to implement a remedial plan that would be sufficient to reduce chemical concentrations in soil to the point that no land use restrictions would be needed, and the Site could be used in the future for residential purposes.

To meet the stated remedial objectives, remedial activities were focused on reducing the concentrations of COCs present in soil at the Site to levels that would be protective of potential future onsite residential land use, and accordingly, protective of all future land uses at the Site.

Consistent with the goals and objectives set forth in the RAW, the post-remediation risk assessment was conducted to:

• Confirm that soil remediation efforts have effectively reduced the concentrations of CPAHs and arsenic in soil at the Site to concentrations that are similar to ambient concentrations;

• Confirm that the cumulative cancer risks posed by all other residual chemicals and noncancer hazards posed by all residual chemicals remaining in onsite soil and soil gas are acceptable and protective of a future residential use scenario.

The post-remediation HHRA was conducted in a manner consistent with the approach set forth in the RAW and in accordance with State and Federal risk assessment guidance documents.

The remaining sections of the post-remediation HHRA are organized according to the typical steps in a risk assessment, as outlined below.

• Section 4.2 summarizes the chemicals included in the post-remediation HHRA;

• Section 4.3 presents the exposure assessment, including the identification of the potentially exposed populations, the specific pathways through which populations could become exposed to chemicals in soil and air, and the magnitude of the potential chemical exposures;

• Section 4.4 presents the toxicity values used in the calculation of the incremental cancer risks and noncancer hazard indices. Section 4.4 also presents the methodology for evaluating health effects associated with the lead detected in soil; and

• Section 4.5 presents a comparison of the residual levels of CPAHs and arsenic remaining in onsite soil to ambient concentrations, as well as a characterization of residual risks associated with all other chemicals remaining in onsite soil and soil gas.

4.2 Data Evaluation and Selection of Chemicals of Potential Concern

This section discusses the environmental data evaluated for use in the post-remediation HHRA and the methodology used to select COPCs for inclusion in the post-remediation HHRA.


4.2.1 Data Evaluation

The analytical results for all samples representative of soil and soil gas remaining on site following the implementation of the remedial activities that are used in the post-remediation HHRA (i.e., samples from locations and/or depths that have not been remediated at the Site), are presented in Tables 3-1 through 3-4. This includes all data obtained during the PEA (Dames and Moore, 1991), RI/HHRA (MSE/AECOM Team, 2008), and post-remediation confirmation sampling. In summary, all soil and soil gas analytical results considered representative of post-remedial conditions at the Site are used in the quantitative post-remediation HHRA.

4.2.2 Onsite Soil and Soil Gas

Under a future land-use scenario, soil down to a depth of 10 feet bgs could potentially be brought up and mixed with surface soil during Site development. Overall, the depths of the remedial excavations conducted across the Site ranged from 2 feet bgs to 32 feet bgs. All onsite soil samples remaining in-place down to a depth of 10 feet bgs are considered in the dataset used to evaluate direct exposures to soil that could be incurred by potential future residential populations (i.e., exposures resulting from soil ingestion, dermal contact with soil, and the inhalation of particulates, discussed further under Section 4.3).

Soil samples collected during previous Site investigations and confirmation sampling from depths down to 10 feet bgs were considered representative of post-remedial conditions at the Site and were analyzed for VOCs, TPH (diesel, gasoline, and motor oil), PAHs, and/or inorganics (metals and cyanide). The summary statistics for the dataset used to evaluate future residential exposure to onsite soil down to a depth of 10 feet bgs at the Site are presented in Table 4-1.

In addition, post-remediation confirmation soil gas analytical results collected from the Site are used in the quantitative post-remediation HHRA to evaluate inhalation of vapors in indoor and outdoor air pathways. In general, post-remediation confirmation soil gas data were collected on a 50-foot x 50-foot grid across the Site with the exception of the area of the former wastewater reservoir in the southeast section of the Site where additional soil gas data were collected from multiple locations. Further, post-remediation confirmation soil gas data were collected at approximately the same locations or in the general vicinity of 2008 RI soil gas sampling locations. As such, post-remediation confirmation soil gas data were considered representative of current post-remedial soil gas conditions at the Site, and previous 2008 RI soil gas data were not included in the dataset quantitatively evaluated in the post-remediation HHRA. The summary statistics for the post-remediation confirmation soil gas dataset used to evaluate future residential exposures are presented in Table 4-2.

4.2.3 Selection of Chemicals of Potential Concern

The selection of COPCs to be included in the quantitative post-remediation HHRA was based on guidance provided by (USEPA, 1989) and Cal/EPA (Cal/EPA, 1997). Briefly, analytical data collected during the original Site remedial investigations and post-remediation confirmation sampling considered representative of onsite soil remaining in place, were compiled, and Site-wide statistics for each chemical were calculated and summarized (e.g., frequency of detection, maximum concentration detected). The summary statistics for chemicals detected in remaining onsite soil following remediation are presented in Table 4-1. The summary statistics for soil gas data are presented in Table 4-2.

In general, all chemicals considered representative of remaining onsite soil and soil gas were included in the quantitative post-remediation HHRA. Consistent with Cal/EPA guidance, the only chemicals excluded from the quantitative risk assessment were inorganic chemicals (metals) detected at levels within ambient concentrations. Ambient concentrations of inorganic chemicals were determined based on eight background samples collected from six offsite borings during the RI, as used in the previous HHRA (MSE/EarthTech, 2008). Specifically, if the maximum detected concentration and the 95% upper confidence limit (UCL) of the arithmetic mean concentration of onsite soil were below the respective


maximum detected concentration and 95% UCL of the ambient soil, then the inorganic chemical was excluded from the quantitative risk assessment. Organic compounds (PAHs and VOCs) were included in the post-remediation HHRA if they were ever detected in soil or soil gas. In accordance with Cal/EPA guidance (1994), lead was retained as a COPC regardless of ambient levels.

As described in the RAW (AECOM, 2011), the remedial activities undertaken at the Site were driven by the presence of various COPCs in soil, including CPAHs and arsenic. For CPAHs and arsenic, the specific numerical remedial targets used as the basis for identifying those areas of the Site that required remedial action were based on the ambient concentrations of CPAHs and arsenic present in urban background soil in California (Cal/EPA, 2009a) and local background soil, respectively, as specified in the RAW. Remedial activities were focused on reducing the concentrations of CPAHs and arsenic in Site soil to ambient concentrations such that potential future residents at the Site (in a residential scenario) will have no more exposure to CPAHs and arsenic than they would have had in the absence of the former MGP operations. As such, CPAHs and arsenic are included in the post-remediation HHRA.

Summaries of COPCs in onsite soil and soil gas that are included in the quantitative post-remediation HHRA are presented in Tables 4-1 and 4-2, respectively, and summarized below:

• Onsite Soil (Table 4-1): VOCs (i.e., benzene), inorganics (i.e., arsenic, barium, chromium, cobalt, copper, lead, nickel, selenium, vanadium, and zinc), CPAHs and non-carcinogenic PAHs.

• Soil Gas (Table 4-2): various VOCs (1,3-butadiene, 2-butanone, 4-ethyltoluene, 4-methyl-2-pentanone, benzene, carbon disulfide, chloroform, ethyl benzene, Freon, propylbenzene, tetrachloroethene, tetrahydrofuran, toluene, trimethylbenzenes, and xylenes).

According to the existing DTSC risk assessment guidance (Cal/EPA, 1994), risks to human health associated with the presence of TPH are assessed by evaluating the significance of individual chemical constituents within the TPH mixture (e.g., benzene, toluene, ethylbenzene, and xylenes [BTEX] and PAHs). The DTSC had released a TPH Interim Guidance which described an approach for evaluating TPH as a mixture in a risk assessment (Cal/EPA, 2009b). However, the TPH Interim Guidance is no longer available on DTSC’s website, and the website specifically states: “This guidance document is no longer active. Future approaches to petroleum hydrocarbon contamination will be part of the revised PEA [Preliminary Endangerment Assessment] Guidance Manual.”

It is our understanding that moving forward, DTSC’s revised PEA Manual will allow health risks associated with weathered TPH, such as those associated with former MGP sites, to be quantified by relying on the estimated risks for the individual chemical constituents in TPH, as originally recommended in DTSC’s 1994 PEA Manual (Cal/EPA, 1994). Based on conversations with representatives from DTSC’s Human and Ecological Risk Office (HERO), we understand that one of the reasons for removing the Interim Guidance is that it may not be a useful tool in remedial decision making for weathered petroleum releases. One example is that many of the toxicity values for TPH recommended in the Interim Guidance are based on fresh petroleum product streams and/or mixtures; such studies may not be representative or relevant for evaluating the toxicity of weathered petroleum releases, such as those associated with MGP operations.

As the TPH associated with residues potentially associated with MGP operations are weathered, an appropriate method for evaluating health risks associated with the TPH is to rely on the specific individual constituents measured in the samples. Therefore, this HHRA evaluates the toxicity of TPH by evaluating the individual compounds that are likely to be associated with the TPH (e.g., BTEX and PAHs).

We note that there are other approaches for evaluating health risks associated with TPH (i.e., TPH Criteria Working Group and Massachusetts Department of Health approaches). The limitations/uncertainties associated with the various approaches for evaluating weathered TPH will be discussed in the Uncertainties in the Risk Assessment (Section 4.5.3.3).


4.3 Exposure Assessment

To quantify whether the residual levels of chemicals present in the onsite soil and soil gas would pose a risk to human populations, it is necessary to identify the populations that may potentially be exposed to the chemicals present in the soil and soil gas and determine the pathways by which the exposures may occur. Identification of the potentially exposed populations requires an evaluation of potential future land use of the Site.

The potentially exposed populations and the complete pathways through which exposure to residual chemicals could occur are discussed in the following sections.

4.3.1 Identification of Potentially Exposed Populations

The overall remedial action goal for the Site was to restore CPAHs and arsenic in soil to ambient conditions such that potential future residents at the Site (in a hypothetical residential scenario) will have no more exposure to CPAHs and arsenic than they would have had in the absence of the former MGP operations, and to verify that the cumulative cancer risks and noncancer hazards posed by other residual chemicals remaining in soil and soil gas at the Site are acceptable and protective of a future residential land use scenario. Accordingly, the primary focus of the post-remediation HHRA is on those exposure pathways that would be considered complete for the future hypothetical residential land use scenario1.

Complete exposure pathways require chemical sources, migration routes, an exposure point for contact, and human exposure routes. The complete pathways through which future onsite residents may be exposed to residual, post-remediation levels of chemicals detected in soil and soil gas include the following:

Future Onsite Resident:

• Inhalation of volatiles migrating from soil and soil gas, up through the soil column, and into indoor/ambient air2

• Inhalation of particulates

• Soil ingestion

• Dermal contact with soil.

4.3.2 Human Intake Assumptions

The route-specific assumptions used to estimate exposure to the residual chemicals remaining in onsite soil and soil gas are presented in Table 4-3. Exposure assumptions are taken from the DTSC and USEPA guidance documents, as cited in Table 4-3.

As described in subsequent sections, the various exposure assumptions are combined to estimate the intake of a chemical through a given route of exposure (e.g., soil ingestion). The route-specific intakes are then combined in order to calculate the total intake, with all exposure pathways combined. The equations used to calculate chemical-specific exposure concentrations (ECs) and chronic daily intakes (CDIs) for residential populations are presented in Table 4-4.

1. As previously indicated in Section 4.1, levels that would be protective of potential future onsite residential land use, accordingly, would be protective of all future land uses at the Site such as future onsite commercial or industrial land uses.

2. Consistent with current DTSC risk assessment recommendations, the inhalation of VOCs in indoor/outdoor air for future onsite resident populations is evaluated in the post-remediation HHRA using the results of the soil gas data.


4.3.3 Estimation of Representative Exposure Point Concentrations

The following section presents the methods used to estimate the representative concentration of the COPCs in the soil and air to which future onsite residents could be exposed.

4.3.3.1 Soil

As discussed by the USEPA (2002), an estimate of the risk associated with a given exposure is based on an estimate of the average concentration from the sampling results. Typically, the 95% UCL is used due to the uncertainty associated with estimating the true average concentration at a site. An estimate of the average concentration is used because:

1. Carcinogenic and chronic non-carcinogenic toxicity criteria are based on lifetime average exposures; and

2. The average concentration is most representative of the concentration that would be contacted over an extended 30-year residential exposure period (USEPA, 2002a) (i.e., exposure point concentration [EPC]).

As mentioned previously in Section 4.2.1, all soil samples remaining onsite and in-place down to a depth of 10 feet bgs were considered in the dataset used to evaluate direct exposures to soil that could be incurred by potential future residential populations (i.e., exposures resulting from soil ingestion, dermal contact with soil, and the inhalation of particulates). Based on a detailed review of the post-remediation analytical data, the following observations are noted:

1. The residual concentrations of COPCs in onsite soil down to a depth of 10 feet bgs, in general, are relatively evenly and randomly distributed; and

2. Localized areas of elevated concentrations in soil at the Site do not exist.

The physical reality at this Site is that the “true” concentration of COPCs to which future populations could be directly exposed is actually much lower than would be estimated using the 95% UCL, as the volume of clean soil has not been accounted for in the estimation of future representative exposure concentrations.

Thus, the 95% UCL3 was conservatively used as the representative soil EPC for the COPCs at the Site, and is believed to provide a conservative estimate of the concentrations to which future residents could be exposed over an extended 30-year exposure period.

The 95% UCL was used as the representative soil EPC to evaluate direct exposures (i.e., soil ingestion and dermal contact) and to estimate the concentration of particulates in outdoor air. Output from the statistical program used in calculating the 95% UCLs is provided in Appendix M. The 95% UCL for the COPCs and representative onsite soil EPCs are presented in Table 4-5.

3. The 95% UCL estimate of the dataset was calculated using USEPA ProUCL Version 4.1 (USEPA, 2010a) statistical program. Data for each chemical were analyzed to determine the distribution pattern (e.g., normal, lognormal, or gamma distribution pattern). If chemical datasets did not fit a normal or lognormal distribution pattern, nonparametric methods were used to calculate the 95% UCL. In instances where the 95% UCL was greater than the maximum detected concentration, the maximum detected concentration was selected in place of the 95% UCL as the representative EPC in soil. In accordance with USEPA guidance (USEPA, 2010b), 95% UCLs were not calculated for datasets with less than five detections or with less than 8 samples. Although the USEPA guidance (USEPA, 2010b) recommends either the use of the mean or the median in these cases, the maximum detected concentration was conservatively used as the representative EPC.


4.3.3.2 Ambient/Indoor Air

Volatile Compounds in Indoor Air

Volatile compounds have the potential to volatilize from soil into soil gas, and migrate up through the soil column and into the indoor air space of an overlying building. This process is referred to as “vapor intrusion.” Building occupants could then be exposed via inhalation to these volatile compounds present in indoor air. The COPCs considered to be volatile are those chemicals with a Henry’s Law constant greater than 1×10-5 atm-m3/mol and a vapor pressure greater than 1×10-3 mm Hg (Cal/EPA, 1994). Physicochemical properties of these COPCs in soil gas are presented in Table 4-6.

In general, soil gas data, rather than soil data, are preferred for use in transport modeling of volatile chemicals to indoor air, because soil gas data represent a direct measurement of the gas-phase constituents that may migrate to indoor air. Thus, soil gas data were used to evaluate the vapor intrusion pathway.

Post-remediation soil gas data are used to assess whether the presence of residual VOCs remaining at the Site could pose a significant health risk to future onsite populations through the vapor intrusion pathway. As previously mentioned in Section 3.3.2.2, soil gas data were collected from 20 locations across the Site at depths of five and 15 feet bgs (location V-C5-V1 was only sampled at five feet bgs). Under the hypothetical future land use scenario, residential buildings could be built anywhere at the Site; thus, potential vapor intrusion for the future onsite resident scenario is evaluated using the soil gas sampling results collected from all sampling locations. Duplicate soil gas samples were taken at four locations; the higher detected concentration of the primary and duplicate was included in the post-remediation HHRA. Potential vapor intrusion into potential future onsite buildings is modeled with the USEPA-recommended Johnson & Ettinger Model for soil gas (SG-SCREEN Version 2.0), as modified by the Cal/EPA DTSC HERO (USEPA, 2004a; Cal/EPA, 2011a).

In summary, the vapor intrusion pathway is evaluated for hypothetical future onsite residents. The details of the fate and transport modeling used to estimate concentrations of volatile chemicals in indoor air are presented in Appendix N. The results of the transport modeling are presented in Tables 4-18 for future onsite residential populations; the table presents the modeled chemical concentration in indoor air associated with each measured chemical concentration in soil gas. The results of the soil gas evaluation are discussed in further detail in Section 4.5, Risk Characterization.

Volatile Compounds in Ambient Air

Post-remediation soil gas data are also used to evaluate the potential inhalation exposures to VOCs in outdoor air for future onsite residents. In general, soil gas data, rather than soil data, are used to model transport of volatile chemicals to outdoor air, because soil gas data represent a direct measurement of the gas-phase contamination that may migrate to outdoor air.

As discussed in Appendix N, transport from soil gas to outdoor air is modeled by assuming steady-state emissions in accordance with ASTM guidance (ASTM, 1995) and a dispersion factor estimated in accordance with the USEPA Soil Screening Guidance (USEPA, 1996; 2002b). This transport process is characterized by the transfer factor (TF), which is defined as the volatile chemical concentration in onsite outdoor air (CA) divided by the volatile chemical concentration in soil gas (CSG). Thus, the concentration of a volatile-phase chemical in outdoor air may be expressed as a function of the chemical concentration in soil gas and the TF:

CA (mg/m3) = CSG (mg/m3) x TF

Chemical- and depth-specific TFs are applied to the results of soil gas sampling data. The results of this transport modeling from soil gas to outdoor air are presented in Table 4-19 for future onsite residents; the


tables present the modeled chemical concentration in onsite outdoor air associated with each measured chemical concentration in soil gas.

Nonvolatile Compounds

Estimation of the concentrations of nonvolatile chemicals in ambient air, present in the particulate form (i.e., adsorbed onto airborne soil particles), requires determination of the concentrations of chemicals in the surface soil and the chemical concentration in the ambient air due to fugitive dust emissions. Airborne particulate matter results from wind erosion and dispersion of surface soil. These processes are modeled using the particulate emission factor (PEF) methodology presented in the USEPA Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites (USEPA, 2002b). The PEF considers an average annual emission rate from wind erosion and is used only for chronic exposure evaluations. The development of the PEF equation is described in detail in the Guidance [USEPA, 2002b] and presented in Appendix N of this HHRA.

Predicted air concentrations of chemicals in the particulate phase are estimated by dividing the concentration of each chemical in the soil (in units of mg/kg) by the PEF (in units of m3 of air per kg dust). The PEFs and resulting outdoor air particulate concentrations for future onsite residents are presented in Table 4-5.

4.4 Toxicity Assessment

The toxicity assessment characterizes the relationship between the magnitude of exposure to a chemical and the potential for adverse effects. More specifically, the toxicity assessment identifies or derives toxicity values that can be used to estimate the likelihood of adverse effects occurring in humans at different exposure levels. Consistent with regulatory risk assessment policy, adverse health effects resulting from chemical exposures are evaluated in two categories: carcinogenic effects and non-carcinogenic effects. The hierarchy of sources for the toxicity criteria used for this post-remediation HHRA corresponds to the State’s guidelines [Cal/EPA, 1994]. All toxicity values used in the HHRA are presented in Table 4-7. For evaluation of lead exposures, the traditional reference dose approach is not applied, because most human health effects data are based on blood lead concentrations, rather than external dose [Cal/EPA, 1993].

4.4.1 Toxicity Assessment for Carcinogenic Effects

Current health risk assessment practice for carcinogens is based on the assumption that there is no threshold dose below which carcinogenic effects do not occur. This approach has generally been adopted by the regulatory agencies as a conservative practice to protect public health, and the “no-threshold” assumption has been used in the agency-derived cancer slope factors (CSFs) and Unit Risk Factors (URFs) used in this HHRA. Although the magnitude of risk declines with decreasing exposure, the risks are believed to be zero only at zero exposure.

The toxicity values used to quantify the response potency of a potential carcinogen are the following:

• The CSF, used in assessing the oral route of exposure, represents the excess lifetime cancer risk due to a continuous, constant lifetime exposure to a specified level of a carcinogen generally reported as excess incremental cancer risk per milligram of chemical per kilogram body weight per day (mg/kg/day)-1.

• The URF, used to assess the inhalation route of exposure, represents the excess lifetime cancer risk due to a continuous, constant lifetime exposure to a specified level of a carcinogen in the air, generally reported as excess incremental cancer risk per microgram of chemical per cubic meter of air (µg/m3)-1; URFs are reported as excess incremental cancer risk per milligram of chemical per cubic meter of air [(mg/m3)-1] in Table 4-7 for risk calculation purposes.


The Cal/EPA and USEPA have published a list of CSFs and URFs recommended for use in risk assessments. In accordance with DTSC guidance [Cal/EPA, 1994], the hierarchy of toxicity values for carcinogenic effects used in this post-remediation HHRA is as follows:

1. The Cal/EPA-recommended CSFs and URFs as maintained on the Cal/EPA Office of Environmental Health Hazard Assessment’s (OEHHA) online toxicity criteria database [Cal/EPA, 2012].

2. The USEPA-recommended CSFs and URFs (referred to as “Inhalation Unit Risks” by USEPA) as maintained on the USEPA’s Integrated Risk Information System (IRIS) on-line database [USEPA, 2012].

3. The National Center of Environmental Assessment (NCEA)/Superfund Health Risk Technical Support Center (STSC)-recommended provisional peer reviewed toxicity values (PPRTVs [Provisional Peer Reviewed Toxicity Values]; as cited in USEPA, 2011b or USEPA 2004b).

4. Other USEPA-recommended values (i.e., HEAST toxicity values; USEPA, 1997).

Table 4-7 presents the CSFs and URFs used in this post-remediation HHRA. As indicated, chemicals detected in soil and soil gas that are currently regulated as carcinogens include: 1,3-butadiene, benzene, chloroform, ethylbenzene, tetrachloroethene, tetrahydrofuran, naphthalene, cobalt, and nickel.

4.4.2 Toxicity Assessment for Noncarcinogenic Effects

The toxicity assessment for noncarcinogenic effects requires the estimation of an exposure level below which no adverse health effects in humans are expected to occur. USEPA refers to these levels as reference doses (RfDs) for oral exposures and reference concentrations (RfCs) for inhalation exposures [USEPA, 1989]. The noncancer RfD represents a dose, given in milligrams of chemical per kilogram of body weight per day (mg/kg/day), that would not be expected to cause adverse noncancer health effects in potentially exposed populations. The noncancer RfD is often referred to as the “acceptable dose.” The noncancer RfC represents the airborne concentration (in units of milligrams per cubic meter [mg/m3]) that would not be expected to cause adverse noncancer health effects in populations exposed through the inhalation pathway. OEHHA refers to these “acceptable dose or concentrations” as Reference Exposure Levels (RELs). As the inhalation RfCs/RELs are derived from inhalation toxicity studies, they are used for evaluating inhalation exposures [USEPA, 1989]. Noncancer toxicity values used (i.e., RfDs and RfCs) correspond to those listed and recommended by Cal/EPA and USEPA.

Consistent with DTSC HERO’s approach [Cal/EPA, 2011a], the more conservative RfD/REL and RfC/REL obtained from either OEHHA’s list of chronic RELs (Cal/EPA, 2012) or USEPA’s sources listed below are used in this post-remediation HHRA (e.g., RfC for naphthalene).

As recommended by USEPA [USEPA, 2003], the hierarchy for toxicity values for noncarcinogenic effects for the oral exposure (i.e., RfDs) from USEPA’s sources used in this post-remediation HHRA is as follows:

1. The USEPA-recommended RfDs as maintained on the USEPA’s IRIS on-line database (USEPA, 2012);

2. The NCEA/STSC-recommended PPRTVs (as cited in USEPA, 2011b or USEPA 2004b); and

3. Other USEPA-recommended values (i.e., HEAST toxicity values; USEPA, 1997).

All noncarcinogenic toxicity values used in this post-remediation HHRA for chemicals detected in onsite soil and soil gas are presented in Table 4-7.

4.4.3 Toxicity Assessment for Lead

The traditional RfD approach to the evaluation of chemicals is not applied to lead because most human health effects data are based on blood lead concentrations, rather than external dose [Cal/EPA, 1993]. Blood lead concentration is an integrated measure of internal dose, reflecting total exposure from Site-related and background sources. A clear “no observed effects level” (NOEL) has not been


established for such lead-related health effects endpoints such as birth weight, gestation period, heme synthesis and neurobehavioral development in children and fetuses, and blood pressure in middle-aged men. The Cal/EPA OEHHA has developed a 1 micrograms per deciliter (µg/dL) benchmark for source-specific incremental change in blood lead levels for protection of school children and fetuses [OEHHA, 2007].

The DTSC has developed a methodology for evaluating exposure and the potential for adverse health effects resulting from exposure to lead in the environment [Cal/EPA, 1993]. The methodology presents an algorithm for estimating blood lead concentrations in children and adults based on a multi-pathway analysis. DTSC has provided a spreadsheet (LeadSpread, Version 8) based on its guidance for evaluating lead toxicity [Cal/EPA, 1993].

For future onsite residential populations who could be exposed to lead in soil via inhalation of particulates, ingestion and dermal contact, health risks associated with lead in onsite soil within the top 10 feet is evaluated with LeadSpread 8. The results of the lead evaluation for future onsite residents are discussed in Section 4.5 (Risk Characterization).

4.5 Risk Characterization

The following section of the post-remediation HHRA presents the quantitative characterization of potential human health risks posed by the residual concentrations of chemicals remaining in onsite soil and soil gas. The uncertainties associated with the projected risks are also briefly discussed in this section and are fully discussed in Appendix O.

The characterization of risk associated with the COPCs in soil at the Site was conducted in this post-remediation HHRA as follows:

• As discussed in the RAW, and in previous sections of this report, the remedial goal for achieving an unrestricted land use scenario for CPAHs and arsenic is not risk-based, but rather is based on reducing CPAHs and arsenic to concentrations that are similar to ambient CPAH concentrations in Northern California soil (ENVIRON et al., 2002) and to ambient arsenic concentrations in local soil, respectively. If this goal is achieved, the residual CPAHs and arsenic remaining in onsite soil should be as protective of human health and the environment as ambient concentrations. Accordingly, the risk characterization section of the post-remediation HHRA presents a comparison of the residual levels of CPAHs and arsenic remaining in the onsite soil to ambient CPAH concentrations in Northern California soil and to ambient arsenic concentrations in local soil, respectively.

• For all other onsite chemicals detected in onsite soil and in soil gas, the risk characterization presents the numerical estimates of future potential cancer risk and noncancer hazard4 posed by the presence of residual levels of COPCs in onsite soil and/or in soil gas.

The statistical comparison of CPAHs and arsenic remaining in onsite soil to ambient concentrations, and the projected residual cancer risks and noncancer hazards associated with COPCs in onsite soil and soil gas, are discussed in the sections that follow.

4.5.1 Comparison of CPAHs Concentrations in Onsite Soil to Ambient Concentrations

Following remediation, confirmation samples were collected from the bottom and sidewalls of the excavated areas and analyzed for CPAHs. The measured concentrations from these samples and the

4. Although the remedial goal of achieving an unrestricted land use scenario for CPAHs is not risk-based, at the recommended by DTSC, the potential noncancer health effects of CPAHs are included in the estimate of cumulative noncancer hazard from all COPCs remaining in onsite soils.


concentration of CPAHs present in the unremediated onsite soil down to a depth of 10 feet bgs were compiled into one dataset for comparison to the ambient CPAHs dataset in order to confirm attainment of the remedial action objectives for the Site.

Table 4-8 presents all CPAHs data points considered representative of the post-remedial conditions remaining in onsite soil and Table 4-9 presents summary statistics for the dataset. As indicated in these tables, a total of 120 samples are considered representative of the onsite soil remaining in place down to 10 feet bgs, ranging from non-detect (ND) (i.e., 0.0012 mg/kg and 0.0088 mg/kg in B(a)P equivalent concentrations) to 0.22 mg/kg (Sample V-C4-W4-0.5-2). The majority of samples, 93 out of 120, were ND for all CPAHs expressed as B(a)P equivalents. The arithmetic mean and 95% UCL of CPAHs present within the top 10 feet of onsite soil are 0.024 mg/kg and 0.040 mg/kg, respectively, in B(a)P equivalent concentrations.

Statistical analyses were performed to compare post-remediation onsite soil concentrations of CPAHs against ambient concentrations to determine if onsite soil had been successfully restored to ambient conditions (ENVIRON et al, 2002). The statistical description of the ambient CPAHs dataset for Northern California is summarized in Table 4-10.

There is no single statistical test that can be used to determine when concentrations on a site are equal to ambient levels. Rather, there are several tests that can be used to support this determination. To evaluate whether the goal for the onsite soil has been attained, the use of both point estimates (e.g., 95% percentile, or 95% UCL) could be used to compare the residual CPAHs detected in the onsite soil to the ambient concentrations of CPAHs. The results of some of these comparisons are discussed below.

The 95th percentile of the Northern California background dataset is 0.92 mg/kg, as shown in Table 4-10. Because this value is lower than the UTL of the background dataset (1.50 mg/kg), 0.9 mg/kg was used as the initial remediation target for the Site. As indicated in Table 4-9, the CPAH concentrations in all in-place onsite samples representative of onsite soil down to a depth of 10 feet bgs (maximum concentration of 0.22 mg/kg) are below 0.9 mg/kg. Further, the 95% UCL of the mean CPAH concentration representative of onsite soil from 0-10 feet bgs of 0.040 mg/kg, is below the 95% UCL of the mean concentration of CPAHs in Northern California surface soil of 0.40 mg/kg.

Based on the results of the statistical comparisons discussed above, remedial efforts have effectively reduced the concentrations of CPAHs in soil at the Site to concentrations that are actually lower than ambient levels; thus

• Residual levels of CPAHs in onsite soil pose no more risk than is posed by ambient levels of CPAHs in Northern California surface soil;

• The remedial action goal for the CPAHs in the onsite soil was attained; and

• The residual levels of CPAHs remaining in soil at the Site are consistent with concentrations that would be considered suitable for residential land use.

4.5.2 Comparison of Arsenic Concentration in Onsite Soil to Ambient Concentrations

As with CPAHs, confirmation samples were collected from the bottom and sidewalls of the excavated areas and analyzed for arsenic following remediation. The measured concentrations from these samples and the concentrations of arsenic present in the remaining onsite soil down to a depth of 10 feet bgs were compiled into one dataset for comparison to the ambient arsenic dataset in order to confirm attainment of the remedial action objectives for the Site.

Table 4-11 presents all arsenic data points considered representative of the post-remedial conditions remaining in onsite soil and Table 4-12 presents summary statistics for the dataset. As indicated in these tables, a total of 105 samples are considered representative of the onsite soil remaining in place down to 10 feet bgs, ranging from non-detect (ND) (i.e., 1 mg/kg) to 13.7 mg/kg (sample V-B4-W2-2, at a depth of 3.5 feet bgs). The majority of samples, 92 out of 105, were non-detects. The mean and 95% UCL of


arsenic present within the top 10 feet of onsite soil are 1.5 mg/kg and 5.8 mg/kg, respectively. Similar to the overall remedial action goal for CPAHs, the remedial action goal for arsenic is to reduce the concentrations of arsenic in soil at the Site to concentrations that are similar to ambient concentrations. As stated in the RAW (AECOM, 2011), this goal is achieved by demonstrating that remediation has effectively reduced arsenic concentrations at the Site such that the 95% UCL for arsenic across the Site is less than 6 mg/kg; the upper limit of ambient concentration of arsenic in Site soil, as recommended by DTSC. As indicated above, the 95% UCL of the mean arsenic concentration representative of onsite soil from 0-10 feet bgs of 5.8 mg/kg is less than the post-remediation goal of 6 mg/kg. Although seven soil samples contained arsenic concentrations above 6 mg/kg, this is not unexpected due to variation in soil, and it is still possible to achieve remediation goals by using the conservative comparison of the 95% UCL with the remediation goal. Additionally, two of the highest concentrations (13.2 mg/kg and 13.7 mg/kg) were detected in confirmation samples collected from the floor of a 10-foot excavation, thus, these concentrations are likely representative of soil at depths greater than 10 ft bgs. Further, all seven of these samples are below the initial remediation target of 16 mg/kg. Accordingly, based on the results of these comparisons, remedial efforts have effectively reduced the concentrations of arsenic in onsite soil to concentrations that are similar to ambient levels; thus

• The remedial action goal for arsenic in Site soil was attained; and

• The residual levels of arsenic remaining in onsite soil are consistent with concentrations that would be considered suitable for residential land use.

4.5.3 Estimated Cancer Risk and Noncancer Hazards

As discussed in the RAW [AECOM, 2011a], the remedial action objective developed for the Site was to ensure that residual concentrations of chemicals remaining in onsite soil are protective of human health and the environment. Successful achievement of these remedial action objectives would in turn result in minimal future land use restrictions for the Site. The goal is achieved by documenting that the cumulative cancer risks and noncancer hazards for all compounds except CPAH5 and arsenic in onsite soil and soil gas are acceptable and protective of future residential land uses.

The remaining portions of this Section present the general methodology used to calculate residual cancer risks and noncancer hazard indices, and present the results and corresponding conclusions that can be drawn from the numerical estimates of risk and hazard.

4.5.3.1 Methodology

The methodology used to estimate the potential incremental cancer risks and noncancer hazard indices for the COPCs was based on guidance provided in the regulatory documents listed below.

• U.S. Environmental Protection Agency (USEPA). 1989. Risk Assessment Guidance for Superfund. Volume I: Human Health Evaluation Manual (Part A). Interim Final. Office of Emergency and Remedial Response. USEPA/540/1-89/002. Washington, D.C. December.

• U.S. Environmental Protection Agency (USEPA). 1991. Risk Assessment Guidance for Superfund. Volume I: Human Health Evaluation Manual. Supplemental Guidance. Standard Default Exposure Factors. Office of Emergency and Remedial Response. March 25.

• California Environmental Protection Agency (Cal/EPA). 1994. Preliminary Endangerment Assessment Manual. Department of Toxic Substances Control.

5. Per DTSC’s recommendation, noncancer hazards are estimated for individual CPAHs and included in the cumulative noncancer hazard index associated with COPCs in onsite soil.


• California Environmental Protection Agency (Cal/EPA). 2011b. DTSC/HERO Human Health Risk Assessment (HHRA) Note Number 1. Recommended DTSC Default Exposure Factors for Use in Risk Assessment at California Hazardous Waste Sites and Permitted Facilities. Department of Toxic Substances Control. May 20.

The potential risk associated with a measured concentration of a chemical in a medium is estimated using the following equations that describe the relationship between estimated intake of constituents, toxicity of specific chemicals, and overall risk for carcinogenic and noncarcinogenic health effects. For carcinogenic effects, the relationship for the ingestion and dermal contact pathways is given by the following equation (USEPA, 1989):

Cancer Risk = CDI x CSF

Where:

Cancer Risk = Cancer risk; the probability of an individual developing cancer as a result of exposure to a particular cumulative dose of a potential carcinogen (unitless);

CDI = Chronic Daily Intake of a chemical (mg chemical/kg body weight-day);

CSF = Cancer Slope Factor; the toxicity value which indicates the upper limit on lifetime incremental cancer risk per unit of dose of chemical (mg chemical/kg body weight-day)-1.

For the inhalation pathway, the relationship for carcinogenic effects is given by the following equation (USEPA, 2009b):

Cancer Risk = EC x URF

Where:

Cancer Risk = Cancer risk; the probability of an individual developing cancer as a result of exposure to a particular cumulative concentration of a potential carcinogen (unitless);

EC = Exposure Concentration of a chemical (mg chemical/m3 air);

URF = Unit Risk Factor; the toxicity value which indicates the upper limit on lifetime incremental cancer risk per unit of concentration of chemical (mg chemical/m3 air)-1.

The relationship for the ingestion and dermal contact pathways for a noncarcinogenic chemical is given by the following equation (USEPA, 1989):

Hazard Quotient = CDI / RfD

Hazard Index = ∑ Hazard Quotient

Where:

Hazard Quotient = Hazard Quotient (HQ); an expression of the potential for a chemical to cause noncarcinogenic effects, which relates the allowable amount of a chemical (reference dose [RfD]) to the estimated site-specific intake (unitless);

Hazard Index = Hazard Index (HI); the sum of the chemical-specific Hazard Quotients, which represents the cumulative potential for predicted exposures to result in noncarcinogenic effects (unitless);


CDI = Chronic Daily Intake of a chemical (mg chemical/kg body weight-day);

RfD = Reference dose; the toxicity value indicating the threshold amount of chemical contacted below which no adverse health effects are expected (mg chemical/kg body weight-day).

For a non-carcinogenic chemical, the relationship for the inhalation pathway is given by the following equation (USEPA, 2009b):

Hazard Quotient = EC / RfC

Hazard Index = ∑ Hazard Quotient

Where:

Hazard Quotient = Hazard Quotient (HQ); an expression of the potential for a chemical to cause noncarcinogenic effects, which relates the allowable concentration of a chemical (reference concentration [RfC]) to the estimated site-specific exposure concentration (unitless);

Hazard Index = Hazard Index (HI); the sum of the chemical-specific Hazard Quotients, which represents the cumulative potential for predicted exposures to result in noncarcinogenic effects (unitless);

EC = Exposure Concentration of a chemical (mg chemical/m3 air);

RfC = Reference concentration; the toxicity value indicating the threshold concentration of chemical contacted below which no adverse health effects are expected (mg chemical/m3 air).

Intake is dependent on the exposure concentration and contact rate. The exposure assumptions and equations used to calculate the EC and CDI for each chemical via the identified complete exposure pathways for potential future onsite residents are presented in Tables 4-3 and 4-4.

The calculated ECs and CDIs for future onsite residents for carcinogenic and noncarcinogenic chemicals in onsite soil are summarized in Tables 4-13 and 4-14, respectively. The calculated ECs and incremental cancer risks and noncancer hazards for future onsite residents for carcinogenic and noncarcinogenic chemicals in indoor and outdoor air are summarized in Tables 4-18 and 4-19, respectively.

Note that the National Contingency Plan (NCP) (40 CFR 300) indicates that lifetime incremental cancer risks posed by a site should not exceed a range of one in one million (1 x 10-6) to one hundred in one million (1 x 10-4). Cal/EPA’s point of departure for excess incremental lifetime cancer risk for all receptor groups (including residential and commercial populations) is 1 x 10-6 and risk management decisions may raise this criterion dependent on Site specific conditions. For noncancer health hazards, a hazard index (HI) of one (1) is identified as the target level of concern. Chemical exposures that yield hazard indices of less than or equal to 1 are not expected to result in adverse noncancer health effects [USEPA, 1989].

4.5.3.2 Results of Cancer Risk and Noncancer Hazard Assessment

This section presents the results of cancer risk and noncancer hazard estimates for exposures associated with the onsite soil and soil gas for future onsite residents. As previously indicated, the incremental cancer risks and noncancer hazards estimated under this land-use scenario are presented in Tables 4-15 and 4-16 for COPCs in onsite soil and in Tables 4-18 and 4-19 for COPCs in soil gas, respectively. The results of the health risk evaluation of lead in onsite soil are presented in Table 4-17.

The estimated incremental cancer risks and noncancer HIs for the future onsite residential population posed by the presence of residual COPCs in onsite soil and in soil gas are summarized in the following table:


Media

Future Onsite Resident

Cancer Risk Noncancer Hazard Index

Onsite Soil 1.6 x 10-7 0.45 (Child)

Soil Gas 2.0 x 10-7 (Maximum) 0.0034 (Maximum)

Cumulative 3.6 x 10-7 0.45 Soil Cancer Risk

As indicated in Table 4-15, the total potential incremental cancer risk for the future onsite residential population posed by the presence of all COPCs (other than CPAHs and arsenic) in onsite soil is 1.6 x 10-, which is below the lower end of the acceptable risk range of 1 x 10-6 to 1 x 10-4. Approximately 87% and 12% of the total potential incremental cancer risk is attributed to naphthalene and cobalt, respectively. Approximately 12%, 59%, and 29% of the total potential incremental cancer risk is from the particulate inhalation, ingestion and dermal contact pathways, respectively.

Soil Gas Cancer Risk

As indicated in Table 4-18, the maximum total potential incremental cancer risks from all COPCs in soil gas range from 3.4 x 10-8 (at sampling depth of 15 ft bgs at location V-B1-V1) to 2.0 x 10-7 (at sampling depth of five ft bgs, at location V-C1-V1; primarily attributed to non-MGP related VOCs, 1,3-butadiene, chloroform 6 and PCE), which are below the lower end of the acceptable risk range of 1 x 10-6 to 1 x 10-4.

As indicated in Table 4-19, the average potential incremental cancer risk from inhalation of outdoor air posed by the presence of VOCs in soil gas under the future residential land use scenario is 8.6 x 10-10, which is well below the lower end of the acceptable risk range of 1 x 10-6 to 1 x 10-4.

Soil Noncancer Hazard

As indicated in Table 4-16, the total potential noncancer hazards for the future onsite resident child and adult posed by the presence of all COPCs in onsite soil are 0.45 and 0.051, respectively, which are both below the acceptable HI of 1. Approximately 74%, 21%, and 2% of the total potential noncancer hazard for the future onsite child resident posed by the presence of all COPCs is attributed to cobalt, vanadium, and barium, respectively, with the ingestion route accounting for approximately 97% of the total hazard.

Soil Gas Noncancer Hazard

As indicated in Table 4-18, for soil gas data, the maximum total potential noncancer HIs from vapor intrusion based on the soil gas data range from 0.00033 (at sampling depth of 15 ft bgs at location V-A5-V1) to 0.0034 (at sampling depth of five ft bgs at V-C3-V1; attributed primarily to trimethylbenzenes), which is well below the acceptable HI of 1.

As indicated in Tables 4-19, the average potential noncancer hazard for the future onsite resident from inhalation of outdoor air posed by the presence of VOCs in soil gas is 0.0000088, which is well below the acceptable HI of 1.

Soil and Soil Gas Cumulative Cancer Risk and Noncancer Hazard

In summary, the estimated cumulative potential incremental cancer risk and noncancer HI posed by the presence of COPCs in onsite soil and in soil gas for the future onsite resident are 3.6 x 10-7 and 0.45, respectively. The estimated cumulative potential incremental cancer risk is below the lower end of the

6. 1,3-Butadiene and chloroform were not detected above laboratory reporting limits in sample V-C1-V1 collected at 5 ft bgs. Estimated vapor intrusion cancer risks for 1,3-butadiene and chloroform in this sample are associated with the concentrations at one-half the laboratory reporting limit.


acceptable risk range of 1 x 10-6 to 1 x 10-4, attributed primarily to the vapor intrusion pathway. The estimated cumulative potential noncancer HI is below the acceptable HI of 1.

Lead Risk Assessment

As indicated in Table 4-17, the 95% UCL concentration for lead in soil of 5.3 mg/kg results in an incremental increase in blood lead level (PbB) in the child of 0.1 µg/dL (at the 90th percentile), which is below the OEHHA’s recommended benchmark change in blood lead concentration of 1 µg/dL [OEHHA 2007].

4.5.3.3 Uncertainties in the Risk Characterization

The risk assessment includes several uncertainties that warrant discussion. Many of the assumptions used in this risk assessment, regarding the representativeness of the sampling data, human exposures, fate and transport modeling, and chemical toxicity, are conservative, following agency guidance, and reflect a 90th or 95th percentile value, rather than a typical or average value. The use of several conservative exposure and toxicity assumptions can introduce considerable uncertainty into the risk assessment. By using conservative exposure or toxicity estimates, the assessment can develop a significant conservative bias that may result in the calculation of significantly higher cancer risk or noncancer hazard than is actually posed by the chemicals present in soil and soil gas. A discussion of the key uncertainties used in this evaluation for the Site is discussed in Appendix O.

As previously noted, there are other approaches for evaluating health risks associated with TPH (i.e., TPH Criteria Working Group and Massachusetts Department of Health approaches). The limitations/uncertainties associated with the various approaches for evaluating weathered TPH will be discussed in the Appendix O, Uncertainties in the Risk Assessment. However, note that, TPH as diesel and motor oil remaining in onsite soil within the top 10 ft are limited to shallow soil in the northeast corner of the Site at relatively low concentrations.


5.0 Conclusions and Recommendations

Remediation activities completed at the Site were effective in achieving the remedial action goal: to reduce chemical concentrations and restore the Site to conditions that would allow unrestricted future use.

The remedial activities completed included the excavation and removal of impacted soil that contained MGP residual contaminants that exceed levels considered safe and protective for future residential populations. The remediation of the Site was performed between July and October of 2011.

The excavation and removal of impacted soil from the Site, was completed under the oversight of the DTSC. Non-hazardous soil was transported to the Forward Landfill in Manteca, California. Non-RCRA hazardous soil was transported to Clean Harbors Landfill in Buttonwillow, California. During excavation, confirmation soil samples were collected and analyzed for PAHs and metals in all areas and for TPH and VOCs in specific areas. The excavation was backfilled with clean import soil. The limits of the excavations and excavation depths are shown on Figure 2-1. A post-remediation soil gas survey was conducted at the Site approximately three months (February 2012) after completion of the soil excavation and backfilling activities.

A post-remediation HHRA was conducted to evaluate the success of soil remediation activities. The remediation confirmation soil and post-remediation soil gas samples representing the post-remediation Site conditions were used for the post-remediation HHRA. The results of the post-remediation HHRA are presented in Section 4.0 of this Report and summarized below.

5.1 Findings of the Post-Remediation Health Risk Assessment

As described in Section 4.0, the post-remediation HHRA supports the following:

• Remediation activities were successful in reducing the CPAHs and arsenic in onsite soil to concentrations that are similar to ambient levels. Thus, the potential risks from residual CPAHs and arsenic remaining in onsite soil would be no different than the risks posed by ambient levels of CPAHs and arsenic. As such, the residual levels of CPAHs and arsenic remaining in onsite soil are consistent with concentrations that would be considered suitable for future residential use scenarios.

• The cumulative potential cancer risks and noncancer hazards posed by all other residual chemicals (i.e., non-CPAHs and excluding arsenic) remaining in onsite soil and soil gas are below levels considered acceptable for future residential populations at the Site. Furthermore, the incremental blood-lead levels estimated for future onsite residential populations are well below the benchmark level of concern for residential populations. As such, the remedial action goal was attained, and the residual levels of chemicals in the onsite soil and soil gas would be considered safe and protective of future residential land use scenarios.

5.2 Recommendations

Based on the successful completion of the onsite soil excavation and the results of the post-remediation HHRA presented in Section 4.0, no further soil removal at the Site would be warranted and no restrictions would be needed for the Site if the Site is developed for residential or commercial purposes. Therefore, AECOM, on behalf of PG&E, requests that the DTSC provide a Closure Letter to indicate that the remedial action is complete and the goals have been attained for the onsite soil at the Site.


6.0 References

AECOM Technical Services (AECOM), Inc, 2011a . Final Removal Action Workplan, Former Madera Manufactured Gas Plant Site, Madera, California. April.

_______, 2011b. Draft Remedial Design and Implementation Plan, Former Madera Manufactured Gas Plant Site, Madera, California. May.

_______, 2011c. Final Remedial Design and Implementation Plan, Former Madera Manufactured Gas Plant Site, Madera, California. June 3.

_______, 2011d. Abandonment of Monitoring wells MW-MAD-1, MW-MAD-2, and MW-MAD-3, Former Madera Manufactured Gas Plant Site, Madera, California. June 20.

_______, 2011e. Letter Workplan, Additional Soil Sampling, Former Madera Manufactured Gas Plant Site, Madera, California. September 9.

_______, 2011f. Letter Workplan, Additional Soil Sampling-Area 5, Former Madera Manufactured Gas Plant Site, Madera, California. September 20.

_______, 2012. Final Post-Remediation Soil Gas Workplan, Former Madera Manufactured Gas Plant Site, Madera, California. January 23.

American Society for Testing and Materials (ASTM). 1995. Standard Guide for Risk-Based Corrective Action Applied at Petroleum Release Sites. Designation: E 1739-95.

California Environmental Protection Agency (Cal/EPA), 1993. Addendum to Chapter 7 of DTSC Supplemental Guidance for Human Health Multimedia Risk Assessments of Hazardous Waste Sites and Permitted Facilities, Memorandum to Interested Parties (Including Lead Spreadsheet Model Version 6). Department of Toxic Substances Control (DTSC). June 10.

_______, 1994. Preliminary Endangerment Assessment Guidance Manual. Department of Toxic Substances Control. January.

_______, 1997. Selecting Inorganic Constituents as Chemicals of Potential Concern at Risk Assessments at Hazardous Waste Site and Permitted Facilities. Sacramento, California. February.

_______, 2009a. Use of the Northern and Southern California Polynuclear Aromatic Hydrocarbon (PAH) Studies in the Manufactured Gas Plant Site Cleanup Process. Department of Toxic Substances Control. July 1.

_______, 2009b. Interim Guidance Evaluating Human Health Risks from Total Petroleum Hydrocarbons (TPH). Department of Toxic Substances Control. Human and Ecological Risk Division (HERD). June 16.

_______, 2011a. Johnson and Ettinger SG-SCREEN Model, EPA Version 2.0, dated April 2003, as modified by DTSC December 6.

_______, 2011b. DTSC/HERO Human Health Risk Assessment (HHRA) Note Number 1. Recommended DTSC Default Exposure Factors for Use in Risk Assessment at California Hazardous Waste Sites and Permitted Facilities. Department of Toxic Substances Control (DTSC). May 20.

_______, 2012. Toxicity Criteria Database. Table of cancer potency factors (July 21, 2009) maintained on-line at http://www.oehha.ca.gov/risk/pdf/tcdb072109alpha.pdf. Office of Environmental Health Hazard Assessment (OEHHA). Table of Air Chronic Reference Exposure Levels Adopted by OEHHA maintained on-line at http://www.oehha.ca.gov/air/allrels.html. Office of Environmental Health Hazard Assessment (OEHHA).

http://www.oehha.ca.gov/air/allrels.html


ENVIRON Corporation, Iris Environmental, and ENV America (ENVIRON et al.), 2002. Background Levels of Polycyclic Aromatic Hydrocarbons in Northern California Surface Soil. June 7.

Dames & Moore, 1991. Preliminary Endangerment Assessment (PEA), Former Manufactured Gas Plant Site in the City of Madera, California, (SQ-YO-MAD). September.

Department of Toxic Substances Control (DTSC), 2001. Information Advisory, Clean Imported Fill Material. October.

_______, 2006. Voluntary Cleanup Agreement, Docket No. HSA-A 05/01-160, 2006.

_______, 2010. Community Profile, PG&E Former Manufactured Gas Plant, 9th and South E Streets, Madera, California. September.

MSE, 2006. Community Profile, Pacific Gas and Electric Company, Former Madera Manufactured Gas Plant, Madera California. October.

MSE/Earth Tech Team, 2006. Draft Site Characterization Work Plan, Groundwater Well Installation, Former Madera Manufactured Gas Plant Site. November.

_______,2007a. Final Remedial Investigation Work Plan, Former Madera Manufactured Gas Plant Site, Madera, California. February 26.

_______,2007b. Addendum to Final Remedial Investigation Work Plan, Groundwater Well Installation, Former Madera Manufactured Gas Plant Site, Madera, California. July 13.

_______, 2007c. Addendum No. 2 to Final Remedial Investigation Work Plan, Additional Remedial Investigations, Former Madera Manufactured Gas Plant Site Madera, California. October 25.

_______, 2008. Draft Remedial Investigation/Human Health Risk Assessment Report Former Madera Manufactured Gas Plant Site. June.

Office of Environmental Health Hazard Assessment (OEHHA), 2007. Development of Health Criteria for Schools Site Risk Assessment Pursuant to Health and Safety Code Section 901(g): Proposed Child-Specific Benchmark Change in Blood Lead Concentration for School Site Risk Assessment. Available at: http://www.oehha.ca.gov/public_info/public/kids/index.html

Pacific Gas & Electric Company (PG&E). 1986. Preliminary Assessment of the Former Manufactured Gas Plant Site in the City of Madera, Site SQ-YO-MAD. December.

_______, 2011. Work Plan – Pre-Excavation Investigations and Waste Profiling, Former Madera Manufactured Gas Plant Site. March 25.

USEPA, 1989. Risk Assessment Guidance for Superfund. Volume 1: Human Health Evaluation Manual (Part A). Interim Final. Office of Emergency and Remedial Response. EPA-540/1-89/002. Washington, D.C. December.

_______, 1991. Risk Assessment Guidance for Superfund. Volume I: Human Health Evaluation Manual. Supplemental Guidance. Standard Default Exposure Factors. Office of Emergency and Remedial Response. March 25.

_______, 1996. Soil Screening Guidance: User’s Guide. Office of Solid Waste and Emergency Response. EPA/540/R-96/018. July.

_______, 1997. Health Effects Assessment Summary Tables (HEAST) FY 1997 Update. Office of Solid Waste and Emergency Response. EPA 540-R-97-036. July.

_______, 2002a. Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. Office of Emergency and Remedial Response. Washington, D.C. OSWER 9285.6-10. December.


_______, 2002b. Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24. December.

_______, 2003. Memorandum: Human Health Toxicity Values in Superfund Risk Assessment. OSWER Directive 9285.7-53. December 5.

_______, 2004a. User’s Guide for Evaluating Subsurface Vapor Intrusion into Buildings. Office of Emergency and Remedial Response. Washington, D.C. Revised February 22, 2004.

_______, 2004b. Preliminary Remediation Goals. Maintained online at http://www.epa.gov/region9/waste/sfund/prg/index.html.

_______, 2008. National Ambient Air Quality Standards for Lead, Final Rule, 40 CFR Part 50, 51, 53, and 58. Federal Register Vol. 73, No, 219. November 12.

_______, 2009a. Non-road Compression-Ignition Engines- Exhaust Emission Standards, 40 CFR Part 1039. June.

_______, 2009b. Risk Assessment Guidance for Superfund. Volume 1: Human Health Evaluation Manual (Part F, Supplemental Guidance for Inhalation Risk Assessment). Final. OSWER Directive 9285.7-82. EPA-540-R1-070-002. January.

_______, 2010a. ProUCL Version 4.1.00 Technical Guide (Draft). EPA/600/R-07/041. May.

_______, 2010b. ProUCL Version 4.1 User Guide (Draft). EPA/600/R-07/041. May.

_______, 2011. USEPA Regional Screening Levels for Chemical Contaminants at Superfund Sites, Nov 2011. Available at http://www.epa.gov/reg3hwmd/risk/human/rb-concentration_table/Generic_Tables/pdf/master_sl_table_run_NOV2011.pdf.

_______, 2012. Integrated Risk Information System (IRIS). http://www.epa.gov/iris/

U.S. Geological Survey (USGS), 1963. Madera, 7.5 minute topographic quadrangle map, photorevised 1981.

http://www.epa.gov/iris/

FINAL REMEDIATION CLOSURE REPORT June 2012

Tables

of 1

TABLE 2-1

Summary of Cleanup Goals Former Madera Manufactured Gas Plant Site Madera, California

Chemical of Concern Collocated with CPAHs Cleanup Goal

CPAHs Yes 1) 0.9 mg/kg benzo(a)pyrene

equivalent concentrations (initial excavation target) (2)

Arsenic Yes but primary contaminant in several locations as well

1) 16 mg/kg (initial excavation target) (3)

2) 6 mg/kg (post-remediation 95% UCL concentration target)

Lead Yes 150 mg/kg

Benzene Yes 0.71 mg/kg

Ethylbenzene Yes 8.0 mg/kg

Acenaphthene Yes 2,775 mg/kg

Benzo(g,h,i)perylene Yes 1,635 mg/kg

Fluoranthene Yes 2,180 mg/kg

Naphthalene (1) Yes but also in two locations outside of CPAH-impacted areas 1.6 mg/kg

Pyrene Yes 1,635 mg/kg

Total Petroleum Hydrocarbons as Diesel

Yes but also in one location outside of CPAH-impacted areas 4,000 mg/kg

Notes: (1) Naphthalene is a carcinogen polycyclic aromatic hydrocarbon which is not considered in the benzo(a)pyrene

equivalent concentrations calculation. (2) Based upon “Use of the Northern and Southern California Polynuclear Aromatic Hydrocarbon Studies in the

Manufactured Gas Plant Site Cleanup Process"; Represents the 95th percentile of the northern California background dataset; Identified to restore the Site to ambient-like conditions.

(3) Developed in accordance with DTSC’s approach for developing arsenic cleanup goals (Cal/EPA 2007, 2009); Initial target based upon the 98 percentile of the arsenic dataset considered representative of ambient conditions; Identified to restore the Site to ambient-like conditions.

CPAHs carcinogenic polycyclic aromatic hydrocarbons mg/kg milligram per kilogram

TABLE 2-2aSummary of Import Soil Analytical Results for PAHs

Madera MGPMadera, California

Page 1 of 5

Sample ID Units FRIANT-QS-1 IS-Friant-1 IS-Friant-2 DUP-082311-1 IS-Friant-3 IS-Friant-4 IS-Friant-5 IS-Friant-6 IS-Friant-7Sample Date 8/2/2011 8/22/2011 8/23/2011 8/23/2011 8/24/2011 8/25/2011 8/25/2011 8/26/2011 8/30/2011Laboratory Job Number 62420 62698 62746 62746 62760 62775 62775 62783 62817Polycyclic Aromatic Hydrocarbons (PAHs) USEPA Method 8310Acenaphthene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Acenaphthylene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Anthracene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Benzo(g,h,i)perylene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Fluoranthene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Fluorene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Naphthalene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Phenanthrene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Pyrene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Benzo(a)anthracene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Benzo(a)pyrene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Benzo(b)fluoranthene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Benzo(k)fluoranthene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Chrysene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Dibenzo(a,h)anthracene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Indeno(1,2,3-cd)pyrene mg/Kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

B(a)P Equivalent mg/Kg 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875

Notes:1) PAHs= POLYCYCLIC AROMATIC HYDROCARBONS, USEPA METHOD 8310.2) "ND<" INDICATES CONSTITUENT(S) NOT DETECTED AT OR ABOVE LABORATORY DETECTION LIMIT.3) BOLD AND HIGHLIGHTED COMPOUNDS INDICATE CARCINOGENIC PAHs (CPAHs) USED TO CALCULATE BENZO(A)PYRENE EQUIVALENT CONCENTRATIONS.4) "J" INDICATES ANALYTE WAS DETECTED. HOWEVER, THE ANALYTE CONCENTRATION IS AN ESTIMATED VALUE, WHICH IS BETWEEN THE METHOD DETECTION LIMIT (MDL) AND THE PRACTICAL QUANTITATION LIMIT (PQL).5) mg/kg = MILLIGRAM PER KILOGRAM6) MGP = MANUFACTURED GAS PLANT7) USEPA = UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

TABLE 2-2aSummary of Import Soil Analytical Results for PAHs


Page 2 of 5

Sample ID UnitsSample DateLaboratory Job NumberPolycyclic Aromatic Hydrocarbons (PAHs) USEPA Method 8310Acenaphthene mg/Kg

Acenaphthylene mg/Kg

Anthracene mg/Kg

Benzo(g,h,i)perylene mg/Kg

Fluoranthene mg/Kg

Fluorene mg/Kg

Naphthalene mg/Kg

Phenanthrene mg/Kg

Pyrene mg/Kg

Benzo(a)anthracene mg/Kg

Benzo(a)pyrene mg/Kg

Benzo(b)fluoranthene mg/Kg

Benzo(k)fluoranthene mg/Kg

Chrysene mg/Kg

Dibenzo(a,h)anthracene mg/Kg

Indeno(1,2,3-cd)pyrene mg/Kg

B(a)P Equivalent mg/Kg

IS-Friant-8 IS-Friant-9 IS-Friant-10 IS-Friant-11 IS-Friant-12 DUP-090911-1 IS-Friant-13 IS-Friant-14 IS-Friant-158/30/2011 9/1/2011 9/1/2011 9/6/2011 9/9/2011 9/9/2011 9/12/2011 10/6/2011 10/12/2011

62817 62858 62858 62884 62929 62929 62944 63312 63373

ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010
















0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875

Notes:1) PAHs= POLYCYCLIC AROMATIC HYDROCARBONS, USEPA METHOD 8310.2) "ND<" INDICATES CONSTITUENT(S) NOT DETECTED AT OR ABOVE LABORATORY DETECTION LIMIT.3) BOLD AND HIGHLIGHTED COMPOUNDS INDICATE CARCINOGENIC PAHs (CPAHs) USED TO CALCULATE BENZO(A)PYRENE EQUIVALENT CONCENTRATIONS.4) "J" INDICATES ANALYTE WAS DETECTED. HOWEVER, THE ANALYTE CONCENTRATION IS AN ESTIMATED VALUE, WHICH IS BETWEEN THE METHOD DETECTION LIMIT (MDL) AND THE PRACTICAL QUANTITATION LIMIT (PQL).5) mg/kg = MILLIGRAM PER KILOGRAM6) MGP = MANUFACTURED GAS PLANT7) USEPA = UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

TABLE 2-2bSummary of Import Soil Analytical Results for Metals, VOCs and TPH


Page 3 of 5

Sample ID Units FRIANT-QS-1 IS-Friant-1 IS-Friant-2 DUP-082311-1 IS-Friant-3 IS-Friant-4 IS-Friant-5 IS-Friant-6 IS-Friant-7Sample Date 8/2/2011 8/22/2011 8/23/2011 8/23/2011 8/24/2011 8/25/2011 8/25/2011 8/26/2011 8/30/2011Laboratory Job Number 62420 62698 62746 62746 62760 62775 62775 62783 62817Metals USEPA Method 6010B/7000CAMAntimony mg/Kg ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0Arsenic mg/Kg ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0Barium mg/Kg 82.5 64.2 61.3 67.3 81 75.2 57.8 81.6 94.5Beryllium mg/Kg ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3Cadmium mg/Kg ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3Chromium mg/Kg 4.93J 4.84J 4.10J 4.08J 5.53 5.3 4.92J 5.65 6.84Cobalt mg/Kg 5.59 4.94J 4.61J 4.78J 6.04 5.36 4.84J 5.42 6.92Copper mg/Kg 7.03 5.42 5.5 5.75 6.8 6.36 4.95J 6.41 8.34Lead mg/Kg 4.05J 3.08J 3.03J 3.09J 3.62J 3.34J ND<2.5 4.53J 4.12JMercury mg/Kg ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1Mercury (By EPA 7471) mg/Kg ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1Molybdenum mg/Kg ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5Nickel mg/Kg 4.86J 4.37J 3.80J 3.89J 5.1 4.64J 4.55J 5.03 5.89Selenium mg/Kg ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0Silver mg/Kg ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5Thallium mg/Kg ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0Vanadium mg/Kg 25.7 23.2 20.7 21.2 28.4 24.3 21.6 26.9 30.5Zinc mg/Kg 34.4 29.6 28.1 28.3 36.1 32.7 26.6 33.3 39.9Total Petroleum Hydrocarbons (TPH) USEPA Method 8015MTPH as Gasoline and Light HC. (C4-C12) mg/Kg ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100TPH as Diesel (C13-C22) mg/Kg ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0TPH as Heavy Hydrocarbons (C23-C40) mg/Kg ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0TPH Total as Diesel and Heavy HC.C13-C40 mg/Kg ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0Volatile Organic Compounds (VOCs) USEPA Method 8260BAll analytes are non-detect for this method mg/Kg

Notes:1) "ND<" INDICATES CONSTITUENT(S) NOT DETECTED AT OR ABOVE LABORATORY DETECTION LIMIT.2) "J" INDICATES ANALYTE WAS DETECTED. HOWEVER, THE ANALYTE CONCENTRATION IS AN ESTIMATED VALUE, WHICH IS BETWEEN THE METHOD DETECTION LIMIT (MDL) AND THE PRACTICAL QUANTITATION LIMIT (PQL).3) mg/kg = milligrams per kilogram4) MGP = MANUFACTURED GAS PLANT5) USEPA = UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

TABLE 2-2bSummary of Import Soil Analytical Results for Metals, VOCs and TPH


Page 4 of 5

Sample ID UnitsSample DateLaboratory Job NumberMetals USEPA Method 6010B/7000CAMAntimony mg/KgArsenic mg/KgBarium mg/KgBeryllium mg/KgCadmium mg/KgChromium mg/KgCobalt mg/KgCopper mg/KgLead mg/KgMercury mg/KgMercury (By EPA 7471) mg/KgMolybdenum mg/KgNickel mg/KgSelenium mg/KgSilver mg/KgThallium mg/KgVanadium mg/KgZinc mg/KgTotal Petroleum Hydrocarbons (TPH) USEPA Method 8015MTPH as Gasoline and Light HC. (C4-C12) mg/KgTPH as Diesel (C13-C22) mg/KgTPH as Heavy Hydrocarbons (C23-C40) mg/KgTPH Total as Diesel and Heavy HC.C13-C40 mg/KgVolatile Organic Compounds (VOCs) USEPA Method 8260BAll analytes are non-detect for this method mg/Kg

IS-Friant-8 IS-Friant-9 IS-Friant-10 IS-Friant-11 IS-Friant-12 DUP-090911-1 IS-Friant-13 IS-Friant-14 IS-Friant-158/30/2011 9/1/2011 9/1/2011 9/6/2011 9/9/2011 9/9/2011 9/12/2011 10/6/2011 10/12/2011

62817 62858 62858 62884 62929 62929 62944 63312 63373

ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

71.9 87.4 78.8 62.9 66.4 66.3 76.2 72.2 77.1ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3

5.73 6.56 6.2 4.64J 4.63J 4.72J 5.19 5.1 5.45.83 6.64 6.04 5.24 5.55 5.47 6.22 5.58 5.735.73 6.71 6.04 5.65 5.87 6.04 5.75 6.45 5.64

2.69J 3.76J 3.27J 2.78J 2.66J 2.63J 3.41J 2.77J 2.79JND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.54.51J 5.84 5.22 4.18J 4.42J 4.49J 5.17 4.69J 4.62J

ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

26.6 31.3 29 22.5 24 24.6 24 24.9 25.832.9 38.5 35.4 29.3 31.6 31.8 34.3 31.6 31.9

ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

Notes:1) "ND<" INDICATES CONSTITUENT(S) NOT DETECTED AT OR ABOVE LABORATORY DETECTION LIMIT.2) "J" INDICATES ANALYTE WAS DETECTED. HOWEVER, THE ANALYTE CONCENTRATION IS AN ESTIMATED VALUE, WHICH IS BETWEEN THE METHOD DETECTION LIMIT (MDL) AND THE PRACTICAL QUANTITATION LIMIT (PQL).3) mg/kg = milligrams per kilogram4) MGP = MANUFACTURED GAS PLANT5) USEPA = UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

TABLE 2-2cSummary of Import Soil Analytical Results


Page 5 of 5

Sample ID Units FRIANT-QS-1Sample Date 8/2/2011Laboratory Job Number 62420Organochlorine Pesticides USEPA Method 8081A

All analytes are non-detect for this method ug/Kg

Semivolatile Organic Compounds (SVOC) USEPA Method 8270C

All analytes are non-detect for this method mg/Kg

Organophosphorus Compounds USEPA Method 8141A


Chlorinated Herbicides USEPA Method 8151A


Asbestos USEPA 600R-93/116

Asbestos, Total Percent ND<1.0

Notes:1) "ND<" INDICATES CONSTITUENT(S) NOT DETECTED AT OR ABOVE LABORATORY DETECTION LIMIT.2) "J" INDICATES ANALYTE WAS DETECTED. HOWEVER, THE ANALYTE CONCENTRATION IS AN ESTIMATED VALUE, WHICH IS BETWEEN THE METHOD DETECTION LIMIT (MDL) AND THE PRACTICAL QUANTITATION LIMIT (PQL).3) ug/kg = MICROGRAM PER KILOGRAM4) MGP = MANUFACTURED GAS PLANT5) USEPA = UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

TABLE 3-1Summary of Confirmation Onsite Soil Analytical Results for PAHs and B(a)P Equivalent Concentrations


Page 1 of 54

Location ID A1-T1 A1-T1 A4-B2 A4-B2 A4-B3 A4-B3 B2-B1 B2-B1Sample ID A1-T1 S06 A1-T1 S07 A4-B2 S02 A4-B2 S03 A4-B3 S01 A4-B3 S02 B2-B1 S04 B2-B1 S05Duplicate Sample IDSample Depth/Interval 8-9 9-9.5 2-3.5 3.5-5 1.5-3 3-4.5 5-6.5 6.5-8Sample Date 7/20/2007 7/20/2007 7/19/2007 7/19/2007 7/19/2007 7/19/2007 7/19/2007 7/19/2007Laboratory Job Number 43225 43225 43206 43206 43226 43226 43225 43225Sample Location: F (floor), W (wall), BH (borehole) BH BH BH BH BH BH BH BHPolycyclic Aromatic Hydrocarbons (PAHs) USEPA Method 8310

Acenaphthene mg/kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Acenaphthylene mg/kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Anthracene mg/kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Benzo(g,h,i)perylene mg/kg 0.054 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.029 ND<0.010 ND<0.010

Fluoranthene mg/kg 0.095 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.049 ND<0.010 ND<0.010

Fluorene mg/kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Naphthalene mg/kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Phenanthrene mg/kg 0.010J ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.026 ND<0.010 ND<0.010

Pyrene mg/kg 0.14 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.058 ND<0.010 ND<0.010

Benzo(a)anthracene mg/kg 0.028 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Benzo(a)pyrene mg/kg 0.074 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.026 ND<0.010 ND<0.010

Benzo(b)fluoranthene mg/kg 0.053 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.017J ND<0.010 ND<0.010

Benzo(k)fluoranthene mg/kg 0.026 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Chrysene mg/kg 0.042 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.017J ND<0.010 ND<0.010

Dibenzo(a,h)anthracene mg/kg ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

Indeno(1,2,3-cd)pyrene mg/kg 0.059 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.026 ND<0.010 ND<0.010

B(a)P Equivalent mg/kg 0.09272 0.00875 0.00875 0.00875 0.00875 0.03317 0.00875 0.00875

Notes:1) PAHs= POLYCYCLIC AROMATIC HYDROCARBONS, USEPA METHOD 8310.2) "ND<" INDICATES CONSTITUENT(S) NOT DETECTED AT OR ABOVE LABORATORY DETECTION LIMIT.3) YELLOW HIGHLIGHT INDICATE CARCINOGENIC PAHs USED TO CALCULATE BENZO(A)PYRENE (B(a)P) EQUIVALENT CONCENTRATION.4) "J" INDICATES ANALYTE WAS DETECTED. HOWEVER, THE ANALYTE CONCENTRATION IS AN ESTIMATED VALUE, WHICH IS BETWEEN THE METHOD DETECTION LIMIT (MDL) AND THE PRACTICAL QUANTITATION LIMIT(PQL).5) mg/kg = MILLIGRAMS PER KILOGRAM6) bgs = BELOW GROUND SURFACE7) ID = IDENTIFICATION8) USEPA = UNITED STATE ENVIRONMENTAL PROTECTION AGENCY9) "J+" INDICATES RESULT IS ESTIMATED FOR POTENTIAL HIGH BIAS.

Units



Page 2 of 54

Location IDSample IDDuplicate Sample IDSample Depth/IntervalSample DateLaboratory Job NumberSample Location: F (floor), W (wall), BH (borehole)Polycyclic Aromatic Hydrocarbons (PAHs) USEPA Method 8310

Acenaphthene mg/kg

Acenaphthylene mg/kg

Anthracene mg/kg

Benzo(g,h,i)perylene mg/kg

Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg

Benzo(a)anthracene mg/kg

Benzo(a)pyrene mg/kg

Benzo(b)fluoranthene mg/kg

Benzo(k)fluoranthene mg/kg

Chrysene mg/kg

Dibenzo(a,h)anthracene mg/kg

Indeno(1,2,3-cd)pyrene mg/kg

B(a)P Equivalent mg/kg

Units

B3-B1 B3-B1 B4-B1 B-MAD-1 B-MAD-1 B-MAD-1 C1-B1B3-B1 S03 B3-B1 S04 B4-B1 S04 B-MAD-1-5.0-6.5A B-MAD-1-10.0-11.5A B-MAD-1-18.0 C1-B1 S03

3.5-5 5-6.5 5-6.5 5-6.5 10-11.5 18- 2-3.57/19/2007 7/19/2007 7/19/2007 2/4/1991 2/4/1991 2/11/1991 7/18/2007

43226 43226 43206 43204BH BH BH BH BH BH BH

ND<0.010 ND<0.010 ND<0.010 ND<0.101 ND<0.101 ND<0.0925 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.0790 ND<0.0790 ND<0.0779 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.0992 ND<0.0992 ND<0.0894 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.0024 ND<0.0024 0.0054 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.00092 ND<0.00092 0.00493 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.0117 ND<0.0117 ND<0.011 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.0449 ND<0.0449 ND<0.0444 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.0545 ND<0.0545 ND<0.0436 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.0158 ND<0.0158 ND<0.01 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.0011 ND<0.0011 0.00206 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.00092 ND<0.00092 0.00293 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.0016 ND<0.0016 0.00526 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.0004 ND<0.0004 0.00292 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.0185 ND<0.0185 ND<0.014 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.0015 ND<0.0015 ND<0.0012 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.00530 ND<0.00530 ND<0.0046 ND<0.010

0.00875 0.00875 0.00875 0.0012275 0.0012275 0.004458 0.00875




Page 3 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

C1-B1 C1-B4 C1-B4 C2-B1 C2-B1 C2-T1 C3-T1 C3-T1C1-B1 S04 C1-B4-S08 C1-B4-S10 C2-B1 S02 C2-B1 S03 C2-T1 S05 C3-T1 S04 C3-T1 S05

5-6.5 14.5-16 18.5-20 2-3.5 3.5-5 5-6.5 4-5.3 5.3-6.57/18/2007 1/10/2008 1/10/2008 7/19/2007 7/19/2007 7/20/2007 7/20/2007 7/20/2007

43204 45578 45578 43226 43226 43233 43225 43225BH BH BH BH BH BH BH BH

ND<0.010 ND<0.010 ND<0.010 ND<0.020 ND<0.010 ND<0.020 ND<0.020 ND<0.010



ND<0.010 ND<0.010 ND<0.010 0.121 ND<0.010 ND<0.020 ND<0.020 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.077 ND<0.010 ND<0.020 0.052 ND<0.010



ND<0.010 ND<0.010 ND<0.010 0.028J ND<0.010 ND<0.020 0.05 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.116 ND<0.010 ND<0.020 0.092 ND<0.010


ND<0.010 ND<0.010 ND<0.010 0.071 ND<0.010 ND<0.020 0.037J ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.053 ND<0.010 ND<0.020 ND<0.020 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.028J ND<0.010 ND<0.020 ND<0.020 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.038J ND<0.010 ND<0.020 0.034J ND<0.010


ND<0.010 ND<0.010 ND<0.010 0.089 ND<0.010 ND<0.020 ND<0.020 ND<0.010

0.00875 0.00875 0.00875 0.09278 0.00875 0.0175 0.04474 0.00875




Page 4 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

C4-B1 C4-B1 C4-B2 C4-B2 C4-B2 C4-B2 MW04 MW06C4-B1 S02 C4-B1 S03 C4-B2 S02 C4-B2 S03 C4-B2 S04 C4-B2 S05 MW04 S04 MW-06-S01

2-3.5 3.5-5 2-3.5 3.5-5 5-6.5 6.5-8 3.5-5 0.5-27/19/2007 7/19/2007 7/19/2007 7/19/2007 7/19/2007 7/19/2007 7/30/2007 7/30/2007

43206 43206 43206 43206 43206 43206 43567 43382BH BH BH BH BH BH BH BH




0.013J ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.050

0.011J ND<0.010 ND<0.010 0.055 ND<0.010 ND<0.010 0.027 0.318ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.050


ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.019J 0.150.018J ND<0.010 ND<0.010 0.09 ND<0.010 ND<0.010 0.037 0.306

ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.269ND<0.010 ND<0.010 ND<0.010 0.045 ND<0.010 ND<0.010 0.012J 0.14ND<0.010 ND<0.010 ND<0.010 0.037 ND<0.010 ND<0.010 ND<0.010 ND<0.050

ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.058JND<0.010 ND<0.010 ND<0.010 0.025 ND<0.010 ND<0.010 0.010J 0.211ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.050

0.012J ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.050

0.00945 0.00875 0.00875 0.05215 0.00875 0.00875 0.0158 0.18831




Page 5 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

MW06 MW-MAD-1 MW-MAD-1 MW-MAD-1 MW-MAD-2 MW-MAD-2 MW-MAD-3 MW-MAD-3MW-06-S02 MW-MAD-1-5-6.5AMW-MAD-1-10-11.5AMW-MAD-1-84-85.5AMW-MAD-2-10-11.5AMW-MAD-2-84-85.5AMW-MAD-3-10-11.5AMW-MAD-3-85.0A

2-3.5 5-6.5 10-11.5 84-85.5 10-11.5 84-85.5 10-11.5 85-7/30/2007 2/6/1991 2/6/1991 2/6/1991 2/6/1991 2/6/1991 2/4/1991 2/4/1991

43382BH BH BH BH BH BH BH BH

















0.00875 0.0012275 0.0012275 0.0012275 0.0012275 0.0012275 0.0012275 0.0012275




Page 6 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-A1-F1 V-A1-F1 V-A1-F2 V-A1-F3 V-A1-F3 V-A1-F4 V-A1-F4 V-A1-W3V-A1-F1-2 DUP-090611-1 V-A1-F2-3 V-A1-F3-4 DUP-090711-1 V-A1-F4-2 DUP-092711-1 V-A1-W3-2-3

V-A1-F1-2 V-A1-F3-4 V-A1-F4-22 2 3 4 4 2 2 2-3

9/6/2011 9/6/2011 9/6/2011 9/7/2011 9/7/2011 9/27/2011 9/27/2011 9/7/201162883 62883 62883 62896 62896 63154 63154 62896floor floor floor floor floor floor floor wall




ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0302ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0184JND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010



ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0266ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0137JND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010


ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0110JND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0173J0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.01874




Page 7 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-A2-F1 V-A2-F2 V-A2-F3 V-A2-F4 V-A2-F7 V-A2-F10 V-A2-W9 V-A2-W9V-A2-F1-3.5 V-A2-F2-8 V-A2-F3-5 V-A2-F4-5.5 V-A2-F7-32 V-A2-F10-16 V-A2-W9-5 V-A2-W9-11

3.5 8 5 5.5 32 16 5 118/12/2011 9/6/2011 9/7/2011 9/7/2011 9/30/2011 9/29/2011 9/29/2011 9/29/2011

62617 62883 62896 62896 63209 63198 63198 63198floor floor floor floor floor floor wall wall

















0.00875 0.00875 0.00875 0.04375 0.00875 0.00875 0.00875 0.00875




Page 8 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-A2-W10 V-A2-W10 V-A2-W11 V-A2-W11 V-A2-W11 V-A2-W11 V-A2-W11 V-A2-W11V-A2-W10-22 V-A2-W10-28 V-A2-W11-5 V-A2-W11-10 V-A2-W11-16 V-A2-W11-22 DUP-100411-1 V-A2-W11-28

V-A2-W11-2222 28 5 10 16 22 22 28

9/30/2011 9/30/2011 10/3/2011 10/3/2011 10/3/2011 10/4/2011 10/4/2011 10/4/201163209 63209 63232 63232 63232 63243 63243 63243

wall wall wall wall wall wall wall wall




ND<0.010 ND<0.010 ND<0.010 0.0917 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.0749 ND<0.010 ND<0.010 ND<0.010 ND<0.010




ND<0.010 ND<0.010 ND<0.010 0.108 ND<0.010 ND<0.010 ND<0.010 ND<0.010


ND<0.010 ND<0.010 ND<0.010 0.0534 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.0585 ND<0.010 ND<0.010 ND<0.010 ND<0.010




ND<0.010 ND<0.010 ND<0.010 0.0569 ND<0.010 ND<0.010 ND<0.010 ND<0.010

0.00875 0.00875 0.00875 0.069928 0.00875 0.00875 0.00875 0.00875




Page 9 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-A2-W11 V-A3-F1 V-A3-F2 V-A3-F3 V-A3-F4 V-A3-W6 V-A3-W6 V-A3-W7DUP-100411-2 V-A3-F1-15 V-A3-F2-10 V-A3-F3-12 V-A3-F4-16 V-A3-W6-5-6.5 V-A3-W6-9-10 V-A3-W7-5-6.5V-A2-W11-28

28 15 10 12 16 5-6.5 9-10 5-6.510/4/2011 8/9/2011 8/10/2011 10/4/2011 9/13/2011 8/10/2011 8/10/2011 8/10/2011

63243 62573 62590 63243 62966 62590 62590 62590wall floor floor floor floor wall wall wall

















0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875




Page 10 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-A3-W7 V-A3-W14 V-A3-W14 V-A3-W15 V-A3-W15 V-A4-F1 V-A4-F1 V-A4-F2V-A3-W7-9-10 V-A3-W14-22 V-A3-W14-28 V-A3-W15-10 V-A3-W15-6 V-A4-F1-5 DUP-080911-1 DUP-081511-1

V-A4-F1-5 V-A4-F2-139-10 22 28 10 6 5 5 13

8/10/2011 10/3/2011 10/3/2011 10/4/2011 10/4/2011 8/9/2011 8/9/2011 8/15/201162590 63232 63232 63243 63243 62573 62573 62632

wall wall wall wall wall floor floor floor

















0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875




Page 11 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-A4-F2 V-A4-F3 V-A4-F3 V-A4-W3 V-A4-W3 V-A4-W3 V-A4-W4 V-A4-W4V-A4-F2-13 V-A4-F3-2 DUP-100411-3 V-A4-W3-0-2 V-A4-W3-2-3.5 V-A4-W3-3.5-5 V-A4-W4-0-2 V-A4-W4-2-3.5

V-A4-F3-213 2 2 0-2 2-3.5 3.5-5 0-2 2-3.5

8/15/2011 10/4/2011 10/4/2011 8/11/2011 8/11/2011 8/11/2011 8/11/2011 8/11/201162632 63243 63243 62604 62604 62604 62604 62604floor floor floor wall wall wall wall wall


ND<0.010 ND<0.010 ND<0.010 0.0544 ND<0.010 ND<0.010 0.0166J ND<0.010


ND<0.010 ND<0.010 ND<0.010 0.0708 ND<0.010 ND<0.010 0.137 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.0494 ND<0.010 ND<0.010 0.108 ND<0.010



ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0315 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.0766 ND<0.010 ND<0.010 0.163 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.0155J ND<0.010 ND<0.010 0.0221 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.054 ND<0.010 ND<0.010 0.0806 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.0428 ND<0.010 ND<0.010 0.0647 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.0178J ND<0.010 ND<0.010 0.0265 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.0226 ND<0.010 ND<0.010 0.0309 ND<0.010


ND<0.010 ND<0.010 ND<0.010 0.0487 ND<0.010 ND<0.010 0.0896 ND<0.010

0.00875 0.00875 0.00875 0.068406 0.00875 0.00875 0.102899 0.00875




Page 12 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-A4-W4 V-A4-W4 V-A4-W5 V-A4-W5 V-A4-W5 V-A4-W7 V-A4-W7 V-A4-W7V-A4-W4-3.5-5 DUP-081111-1 V-A4-W5-0-2 DUP-091311-1 V-A4-W5-7 V-A4-W7-0.5-2 V-A4-W7-2-3.5 V-A4-W7-3.5-5

V-A4-W4-3.5-5 V-A4-W5-0-23.5-5 3.5-5 0-2 0-2 7 0.5-2 2-3.5 3.5-5

8/11/2011 8/11/2011 9/13/2011 9/13/2011 9/13/2011 9/16/2011 9/16/2011 9/16/201162604 62604 62966 62966 62966 63031 63031 63031

wall wall wall wall wall wall wall wall




0.0181J ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.052 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.136 ND<0.010 ND<0.010



ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0964 ND<0.010 ND<0.010

0.0113J ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.214 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0385 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0707 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0481 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0268 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0359 ND<0.010 ND<0.010


0.0110J ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0482 ND<0.010 ND<0.010

0.00935 0.00875 0.00875 0.00875 0.00875 0.088919 0.00875 0.00875




Page 13 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-A4-W11 V-A4-W12 V-A5-F1 V-A5-F1 V-A5-F2 V-A5-F3 V-A5-F4 V-A5-F5V-A4-W11-0-1.5 V-A4-W12-0-1.5 V-A5-F1-10 DUP-080811-2 V-A5-F2-10 V-A5-F3-10 V-A5-F4-10 V-A5-F5-6.5

V-A5-F1-100-1.5 0-1.5 10 10 10 10 10 5-6.5

10/7/2011 10/7/2011 8/8/2011 8/8/2011 8/8/2011 8/8/2011 8/15/2011 8/9/201163323 63323 62541 62541 62541 62541 62632 62573

wall wall floor floor floor floor floor floor





ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0139J ND<0.010












0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875




Page 14 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-B1-F1 V-B1-F2 V-B1-W1 V-B1-W1 V-B1-W1 V-B1-W3 V-B1-W3 V-B1-W5V-B1-F1-3.5 V-B1-F2-5 V-B1-W1-3.5-5 V-B1-W1-5-6.5 V-B1-W1-8-10 V-B1-W3-5-6 V-B1-W3-9-10 V-B1-W5-5-6

3.5 5 3.5-5 5-6.5 8-10 5-6 9-10 5-68/24/2011 9/7/2011 8/8/2011 8/8/2011 8/8/2011 8/18/2011 8/18/2011 8/26/2011

62759 62896 62541 62541 62541 62665 62665 62782floor floor wall wall wall wall wall wall









ND<0.010 0.0122J ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010








0.00875 0.01598 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875




Page 15 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-B1-W5 V-B2-F1 V-B2-F1 V-B2-F2 V-B2-W3 V-B2-W3 V-B2-W3 V-B2-W4V-B1-W5-9-10 V-B2-F1-4 DUP-082411-1 V-B2-F2-8 V-B2-W3-9 DUP-092911-1 V-B2-W3-16 V-B2-W4-22

V-B2-F1-4 V-B2-W3-99-10 4 4 8 9 9 16 22

8/26/2011 8/24/2011 8/24/2011 9/1/2011 9/29/2011 9/29/2011 9/29/2011 10/3/201162782 62759 62759 62857 63198 63198 63198 63232

wall floor floor floor wall wall wall wall





ND<0.010 ND<0.010 ND<0.010 0.12 ND<0.010 ND<0.010 ND<0.010 ND<0.010



ND<0.010 ND<0.010 ND<0.010 0.0416 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.218 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.0948 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.102 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.0413 ND<0.010 ND<0.010 ND<0.010 ND<0.010


ND<0.010 ND<0.010 ND<0.010 0.0946 ND<0.010 ND<0.010 ND<0.010 ND<0.010



0.00875 0.00875 0.00875 0.124796 0.00875 0.00875 0.00875 0.00875




Page 16 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-B2-W4 V-B3-F1 V-B3-F2 V-B4-F1 V-B4-W1 V-B4-W1 V-B4-W1 V-B4-W2V-B2-W4-28 V-B3-F1-2 V-B3-F2-2 V-B4-F1-5 V-B4-W1-0-2 V-B4-W1-2-3.5 V-B4-W1-3.5-5 V-B4-W2-0-2

28 2 2 15 0-2 2-3.5 3.5-5 0-210/3/2011 9/6/2011 9/6/2011 9/2/2011 8/15/2011 8/15/2011 8/15/2011 9/2/2011

63232 62883 62883 62866 62632 62632 62632 62866wall floor floor floor wall wall wall wall




ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0179J ND<0.010 ND<0.010





ND<0.010 0.0169J ND<0.010 ND<0.010 ND<0.010 0.0123J ND<0.010 ND<0.010



ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0102J ND<0.010 ND<0.010





0.00875 0.00875 0.00875 0.00875 0.00875 0.00927 0.00875 0.00875




Page 17 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-B4-W2 V-B4-W2 V-B4-W2 V-B5-F1 V-B5-F2 V-B5-F3 V-B5-W3 V-B5-W3DUP-090211-1 V-B4-W2-2-3.5 V-B4-W2-3.5-5 V-B5-F1-10 V-B5-F2-6 V-B5-F3-3 V-B5-W3-2-3.5 V-B5-W3-3.5-5V-B4-W2-0-2

0-2 2-3.5 3.5-5 10 6 3 2-3.5 3.5-59/2/2011 9/2/2011 9/2/2011 8/22/2011 8/29/2011 8/31/2011 8/25/2011 8/25/201162866 62866 62866 62697 62803 62837 62774 62774

wall wall wall floor floor floor wall wall

















0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875 0.00875




Page 18 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-B5-W6 V-B5-W7 V-B5-W7 V-B5-W8 V-B5-W8 V-C1-F5 V-C1-F6 V-C1-F6V-B5-W6-2-3.5 V-B5-W7-0.5-2 V-B5-W7-2-3 V-B5-W8-0.5-2 V-B5-W8-2-3 V-C1-F5-6 V-C1-F6-10 DUP-081711-1

V-C1-F6-102-3.5 0.5-2 2-3 0.5-2 2-3 6 10 10

8/29/2011 8/31/2011 8/31/2011 9/7/2011 9/7/2011 8/16/2011 8/17/2011 8/17/201162803 62837 62837 62896 62896 62642 62654 62654

wall wall wall wall wall floor floor floor




ND<0.010 0.181 ND<0.010 0.11 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 0.0375 ND<0.010 0.139 0.0161J ND<0.010 ND<0.010 ND<0.010



ND<0.010 ND<0.010 ND<0.010 0.0552 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 0.0625 ND<0.010 0.222 0.0246 ND<0.010 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.0332 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 0.0413 ND<0.010 0.103 0.0114J ND<0.010 ND<0.010 ND<0.010

ND<0.010 0.0384 ND<0.010 0.0761 0.0120J ND<0.010 ND<0.010 ND<0.010

ND<0.010 0.0118J ND<0.010 0.0347 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 0.0146J ND<0.010 0.0453 ND<0.010 ND<0.010 ND<0.010 ND<0.010


ND<0.010 0.0574 ND<0.010 0.0856 ND<0.010 ND<0.010 ND<0.010 ND<0.010

0.00875 0.054406 0.00875 0.128113 0.01585 0.00875 0.00875 0.00875




Page 19 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-C1-F7 V-C1-W1 V-C1-W2 V-C1-W2 V-C1-W2 V-C1-W2 V-C1-W3 V-C1-W5V-C1-F7-17 V-C1-W1-8-10 V-C1-W2-3.5 V-C1-W2-5.5 V-C1-W2-7.5 V-C1-W2-8-10 V-C1-W3-3-4 V-C1-W5-2-2.5

17 8-10 3.5 5.5 7.5 8-10 3-4 2-2.58/17/2011 8/3/2011 8/4/2011 8/4/2011 8/4/2011 8/4/2011 8/10/2011 8/10/2011

62654 62434 62471 62471 62471 62471 62590 62590floor wall wall wall wall wall wall wall

0.0953J+ ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.08570.0474J+ ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 ND<0.010 0.169 ND<0.010 ND<0.010 0.565 ND<0.010 0.2920.0813J+ ND<0.010 0.0238 ND<0.010 ND<0.010 0.149J 0.115 0.1030.108J+ ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.181J 0.493 0.03480.247J+ ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.100J 0.0788J 0.08660.430J+ ND<0.010 0.0423 ND<0.010 ND<0.010 0.155J 0.165 0.125


ND<0.010 ND<0.010 0.0386 ND<0.010 ND<0.010 0.126J ND<0.010 0.0959ND<0.010 ND<0.010 0.0236 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.63ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0302ND<0.010 ND<0.010 0.0106J ND<0.010 ND<0.010 ND<0.010 ND<0.010 0.0191JND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 ND<0.010 0.0629 ND<0.010 ND<0.010 0.218 ND<0.010 0.1930.00875 0.00875 0.050056 0.00875 0.00875 0.15105 0.00875 0.183611




Page 20 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-C2-F1 V-C2-F3 V-C2-F4 V-C2-W4 V-C2-W4 V-C3-F1 V-C3-F1 V-C3-F2V-C2-F1-4.5 V-C2-F3-3.5 V-C2-F4-3 V-C2-W4-2-3.5 V-C2-W4-3.5-5 V-C3-F1-3 DUP-082511-1 V-C3-F2-3

V-C3-F1-34.5 3.5 3 2-3.5 3.5-5 3 3 3

8/22/2011 8/19/2011 8/31/2011 8/22/2011 8/22/2011 8/25/2011 8/25/2011 8/30/201162697 62678 62837 62697 62697 62774 62774 62816floor floor floor wall wall floor floor floor




ND<0.010 ND<0.010 ND<0.010 0.0204 ND<0.010 ND<0.010 ND<0.010 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.0235 ND<0.010 ND<0.010 ND<0.010 ND<0.010




ND<0.010 ND<0.010 ND<0.010 0.0295 ND<0.010 ND<0.010 ND<0.010 ND<0.010








0.00875 0.00875 0.00875 0.01794 0.00875 0.00875 0.00875 0.00875




Page 21 of 54


Acenaphthene mg/kg


Anthracene mg/kg


Fluoranthene mg/kg

Fluorene mg/kg

Naphthalene mg/kg

Phenanthrene mg/kg

Pyrene mg/kg





Chrysene mg/kg




Units

V-C3-F2 V-C3-F3 V-C3-W3 V-C4-F1 V-C4-F2 V-C4-F3 V-C4-W4 V-C4-W5DUP-083011-1 V-C3-F3-3 V-C3-W3-2-3 V-C4-F1-2 V-C4-F2-11 V-C4-F3-1.5 V-C4-W4-0.5-2 V-C4-W5-0-1.5

V-C3-F2-33 3 2-3 2 11 1.5 0.5-2 0-1.5

8/30/2011 8/30/2011 8/30/2011 8/30/2011 9/1/2011 9/12/2011 9/6/2011 9/12/201162816 62816 62816 62816 62857 62943 62883 62943floor floor wall floor floor floor wall wall




ND<0.010 ND<0.010 0.0514 0.111 ND<0.010 ND<0.010 0.224 ND<0.010

ND<0.010 ND<0.010 0.0202 0.137 ND<0.010 ND<0.010 0.285 ND<0.010



ND<0.010 ND<0.010 ND<0.010 0.0539 ND<0.010 ND<0.010 0.111 ND<0.010

ND<0.010 ND<0.010 0.03 0.24 ND<0.010 ND<0.010 0.398 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.0327 ND<0.010 ND<0.010 0.0524 ND<0.010

ND<0.010 ND<0.010 0.0206 0.0988 ND<0.010 ND<0.010 0.171 ND<0.010

ND<0.010 ND<0.010 0.0188J 0.075 ND<0.010 ND<0.010 0.19 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.0332 ND<0.010 ND<0.010 0.0609 ND<0.010

ND<0.010 ND<0.010 ND<0.010 0.0443 ND<0.010 ND<0.010 0.0118J ND<0.010


ND<0.010 ND<0.010 0.0245 0.0869 ND<0.010 ND<0.010 0.17 ND<0.010

0.00875 0.00875 0.02768 0.123723 0.00875 0.00875 0.220148 0.00875


TABLE 3-2Summary of Confirmation Onsite Soil Analytical Results for VOCs and TPH

Madera MGP,Madera, California

Page 22 of 54

Location ID A2-SLB1 A2-SLB1 A2-SLB1 A2-SLB1 A2-SLB1 A2-SLB1 A4-B2Sample ID A2-SLB1-35 A2-SLB1-40 A2-SLB1-45 A2-SLB1-50 A2-SLB1-55 A2-SLB1-60 A4-B2 S02Duplicate Sample IDSample Depth/Interval 30.3 34.6 39 43.3 47.6 52 2-3.5Sample Date 9/21/2011 9/21/2011 9/21/2011 9/21/2011 9/21/2011 9/21/2011 7/19/2007Laboratory Job Number 63090 63090 63090 63090 63090 63090 43206Sample Location: F (floor), W (wall), BH (borehole) BHTotal Petroleum Hydrocarbons (TPH) USEPA Method 8015MTPH as Gasoline and Light HC. (C4-C12) mg/Kg ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.500TPH as Diesel (C13-C22) mg/kg ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<5.0TPH Total as Diesel and Heavy HC (C13-C40) mg/Kg ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<5.0TPH as Heavy Hydrocarbons (C23-C40) mg/Kg ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<5.0Volatile Organic Compounds (VOCs) USEPA Method 8020/8260BBenzene µg/Kg N/A N/A ND<1.0 N/A N/A N/A ND<2.0Naphthalene µg/Kg N/A N/A ND<5.0 N/A N/A N/A ND<5.0All other compounds are not-detected for this method µg/Kg

Notes:1) "ND<" INDICATES CONSTITUENT(S) NOT DETECTED AT OR ABOVE LABORATORY DETECTION LIMIT.2) "J" INDICATES ANALYTE WAS DETECTED. HOWEVER, THE ANALYTE CONCENTRATION IS AN ESTIMATED VALUE, WHICH IS BETWEEN THE METHOD DETECTION LIMIT (MDL) AND THE PRACTICAL QUANTITATION LIMIT(PQL).3) "N/A" INDICATES SAMPLE WAS NOT ANALYZED FOR AN ANALYTE.4) mg/kg = MILLIGRAMS PER KILOGRAM5) µg/Kg = MICROGRAMS PER KILOGRAM6) bgs = BELOW GROUND SURFACE7) ID = IDENTIFICATION8) USEPA = UNITED STATE ENVIRONMENTAL PROTECTION AGENCY

Units



Page 23 of 54

Location IDSample IDDuplicate Sample IDSample Depth/IntervalSample DateLaboratory Job NumberSample Location: F (floor), W (wall), BH (borehole)Total Petroleum Hydrocarbons (TPH) USEPA Method 8015MTPH as Gasoline and Light HC. (C4-C12) mg/KgTPH as Diesel (C13-C22) mg/kgTPH Total as Diesel and Heavy HC (C13-C40) mg/KgTPH as Heavy Hydrocarbons (C23-C40) mg/KgVolatile Organic Compounds (VOCs) USEPA Method 8020/8260BBenzene µg/KgNaphthalene µg/KgAll other compounds are not-detected for this method µg/Kg

Units

A4-B2 A4-B3 A4-B3 B2-SLB1 B2-SLB1 B2-SLB1 B3-B1A4-B2 S03 A4-B3 S01 A4-B3 S02 B2-SLB1-40 B2-SLB1-45 B2-SLB1-50 B3-B1 S03

3.5-5 1.5-3 3-4.5 32.8 36.9 41 3.5-57/19/2007 7/19/2007 7/19/2007 9/23/2011 9/23/2011 9/23/2011 7/19/2007

43206 43226 43226 63121 63121 63121 43226BH BH BH BH

ND<0.500 ND<0.500 ND<0.500 ND<0.100 ND<0.100 ND<0.100 ND<0.500ND<5.0 ND<5.0 ND<5.0 ND<1.0 ND<1.0 ND<1.0 ND<5.0ND<5.0 ND<5.0 ND<5.0 ND<1.0 ND<1.0 ND<1.0 ND<5.0ND<5.0 ND<5.0 ND<5.0 ND<1.0 ND<1.0 ND<1.0 ND<5.0

N/A ND<2.0 ND<2.0 N/A N/A N/A N/AN/A ND<5.0 ND<5.0 N/A N/A N/A N/A




Page 24 of 54


Units

B3-B1 B4-B1 B-MAD-1 B-MAD-1 B-MAD-1 C1-B1 C1-B1B3-B1 S04 B4-B1 S04 B-MAD-1-5.0-6.5A B-MAD-1-10.0-11.5A B-MAD-1-18.0 C1-B1 S03 C1-B1 S04

5-6.5 5-6.5 5-6.5 10-11.5 18- 2-3.5 5-6.57/19/2007 7/19/2007 2/4/1991 2/4/1991 2/11/1991 7/18/2007 7/18/2007

43226 43206 43204 43204BH BH BH BH BH BH BH

ND<0.500 ND<0.500 N/A N/A N/A ND<0.500 ND<0.500ND<5.0 ND<5.0 ND<5.00 ND<5.00 ND<5.00 ND<5.0 ND<5.0ND<5.0 ND<5.0 N/A N/A N/A ND<5.0 ND<5.0ND<5.0 ND<5.0 N/A N/A N/A ND<5.0 ND<5.0

N/A N/A ND<1 ND<1 ND<1 ND<2.0 N/AN/A N/A N/A N/A N/A ND<5.0 N/A




Page 25 of 54


Units

C1-B4 C2-B1 C2-B1 C2-T1 C3-T1 C3-T1 C4-B1C1-B4-S06 C2-B1 S02 C2-B1 S03 C2-T1 S05 C3-T1 S04 C3-T1 S05 C4-B1 S02

10.75-12 2-3.5 3.5-5 5-6.5 4-5.3 5.3-6.5 2-3.51/10/2008 7/19/2007 7/19/2007 7/20/2007 7/20/2007 7/20/2007 7/19/2007

45578 43226 43226 43233 43225 43225 43206BH BH BH BH BH BH BH

N/A ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500N/A ND<5.0 ND<5.0 ND<5.0 ND<5.0 ND<5.0 ND<5.0N/A ND<5.0 ND<5.0 ND<5.0 ND<5.0 ND<5.0 ND<5.0N/A ND<5.0 ND<5.0 ND<5.0 ND<5.0 ND<5.0 ND<5.0

ND<2.0 ND<2.0 N/A ND<2.0 ND<2.0 ND<2.0 ND<2.0ND<5.0 ND<5.0 N/A ND<5.0 ND<5.0 ND<5.0 ND<5.0




Page 26 of 54


Units

C4-B1 C4-B2 C4-B2 MW06 MW06 MW-MAD-1 MW-MAD-1C4-B1 S03 C4-B2 S02 C4-B2 S03 MW-06-S01 MW-06-S02 MW-MAD-1-5-6.5AMW-MAD-1-10-11.5A

3.5-5 2-3.5 3.5-5 0.5-2 2-3.5 5-6.5 10-11.57/19/2007 7/19/2007 7/19/2007 7/30/2007 7/30/2007 2/6/1991 2/6/1991

43206 43206 43206 43382 43382BH BH BH BH BH BH BH

ND<0.500 ND<0.500 ND<0.500 ND<0.500 ND<0.500 N/A N/AND<5.0 ND<5.0 ND<5.0 652 ND<5.0 ND<5.00 ND<5.00ND<5.0 ND<5.0 ND<5.0 4450 ND<5.0 N/A N/AND<5.0 ND<5.0 ND<5.0 3800 ND<5.0 N/A N/A

N/A ND<2.0 N/A ND<2.0 ND<2.0 ND<1 ND<1N/A ND<5.0 N/A ND<5.0 ND<5.0 N/A N/A




Page 27 of 54


Units

MW-MAD-1 MW-MAD-2 MW-MAD-2 MW-MAD-3 MW-MAD-3 V-A2-F7 V-A2-F10MW-MAD-1-84-85.5AMW-MAD-2-10-11.5AMW-MAD-2-84-85.5AMW-MAD-3-10-11.5AMW-MAD-3-85.0A V-A2-F7-32 V-A2-F10-16

84-85.5 10-11.5 84-85.5 10-11.5 85- 32 162/6/1991 2/6/1991 2/6/1991 2/4/1991 2/4/1991 9/30/2011 9/29/2011

63209 63198BH BH BH BH BH floor floor

N/A N/A N/A N/A N/A ND<0.100 ND<0.100ND<5.00 ND<5.00 ND<5.00 ND<5.00 ND<5.00 ND<1.0 ND<1.0

N/A N/A N/A N/A N/A ND<1.0 ND<1.0N/A N/A N/A N/A N/A ND<1.0 ND<1.0

ND<1 ND<1 ND<1 ND<1 ND<1 ND<1.0 ND<1.0N/A N/A N/A N/A N/A ND<5.0 ND<5.0




Page 28 of 54


Units

V-A2-W9 V-A2-W9 V-A2-W10 V-A2-W10 V-A2-W11 V-A2-W11 V-A2-W11V-A2-W9-5 V-A2-W9-11 V-A2-W10-22 V-A2-W10-28 V-A2-W11-5 V-A2-W11-10 V-A2-W11-16

5 11 22 28 5 10 169/29/2011 9/29/2011 9/30/2011 9/30/2011 10/3/2011 10/3/2011 10/3/2011

63198 63198 63209 63209 63232 63232 63232wall wall wall wall wall wall wall


N/A N/A ND<1.0 ND<1.0 N/A N/A N/AN/A N/A ND<5.0 ND<5.0 N/A N/A N/A




Page 29 of 54


Units

V-A2-W11 V-A2-W11 V-A2-W11 V-A2-W11 V-A3-F1 V-A3-F2 V-A3-F3V-A2-W11-22 DUP-100411-1 V-A2-W11-28 DUP-100411-2 V-A3-F1-15 V-A3-F2-10 V-A3-F3-12

V-A2-W11-22 V-A2-W11-2822 22 28 28 15 10 12

10/4/2011 10/4/2011 10/4/2011 10/4/2011 8/9/2011 8/10/2011 10/4/201163243 63243 63243 63243 62573 62590 63243wall wall wall wall floor floor floor


N/A N/A N/A N/A ND<1.0 N/A N/AN/A N/A N/A N/A ND<5.0 N/A N/A




Page 30 of 54


Units

V-A3-F4 V-A3-W14 V-A3-W14 V-A3-W15 V-A3-W15 V-A3-W6 V-A3-W6V-A3-F4-16 V-A3-W14-22 V-A3-W14-28 V-A3-W15-10 V-A3-W15-6 V-A3-W6-5-6.5 V-A3-W6-9-10

16 22 28 10 6 5-6.5 9-109/13/2011 10/3/2011 10/3/2011 10/4/2011 10/4/2011 8/10/2011 8/10/2011

62966 63232 63232 63243 63243 62590 62590floor wall wall wall wall wall wall


N/A N/A N/A N/A N/A N/A N/AN/A N/A N/A N/A N/A N/A N/A




Page 31 of 54


Units

V-A3-W7 V-A3-W7 V-A4-F2 V-A4-F2 V-A4-W5 V-A4-W5 V-A4-W5V-A3-W7-5-6.5 V-A3-W7-9-10 V-A4-F2-13 DUP-081511-1 V-A4-W5-0-2 DUP-091311-1 V-A4-W5-7

V-A4-F2-13 V-A4-W5-0-25-6.5 9-10 13 13 0-2 0-2 7

8/10/2011 8/10/2011 8/15/2011 8/15/2011 9/13/2011 9/13/2011 9/13/201162590 62590 62632 62632 62966 62966 62966wall wall floor floor wall wall wall

ND<0.100 ND<0.100 N/A N/A ND<0.100 ND<0.100 ND<0.100ND<1.0 ND<1.0 N/A N/A ND<1.0 ND<1.0 ND<1.0ND<1.0 ND<1.0 N/A N/A ND<1.0 ND<1.0 ND<1.0ND<1.0 ND<1.0 N/A N/A ND<1.0 ND<1.0 ND<1.0

N/A N/A ND<1.0 ND<1.0 N/A N/A N/AN/A N/A ND<5.0 ND<5.0 N/A N/A N/A




Page 32 of 54


Units

V-B1-W1 V-B1-W1 V-B1-W1 V-B1-W3 V-B1-W3 V-B1-W5 V-B1-W5V-B1-W1-3.5-5 V-B1-W1-5-6.5 V-B1-W1-8-10 V-B1-W3-5-6 V-B1-W3-9-10 V-B1-W5-5-6 V-B1-W5-9-10

3.5-5 5-6.5 8-10 5-6 9-10 5-6 9-108/8/2011 8/8/2011 8/8/2011 8/18/2011 8/18/2011 8/26/2011 8/26/2011

62541 62541 62541 62665 62665 62782 62782wall wall wall wall wall wall wall

N/A N/A N/A ND<0.100 ND<0.100 ND<0.100 ND<0.100N/A N/A N/A ND<1.0 ND<1.0 ND<1.0 ND<1.0N/A N/A N/A ND<1.0 ND<1.0 ND<1.0 ND<1.0N/A N/A N/A ND<1.0 ND<1.0 ND<1.0 ND<1.0

ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 N/A N/AND<5.0 ND<5.0 ND<5.0 ND<5.0 ND<5.0 N/A N/A




Page 33 of 54


Units

V-B2-F2 V-B2-W3 V-B2-W3 V-B2-W3 V-B2-W4 V-B2-W4 V-B4-F1V-B2-F2-8 V-B2-W3-16 V-B2-W3-9 DUP-092911-1 V-B2-W4-22 V-B2-W4-28 V-B4-F1-5

V-B2-W3-98 16 9 9 22 28 15

9/1/2011 9/29/2011 9/29/2011 9/29/2011 10/3/2011 10/3/2011 9/2/201162857 63198 63198 63198 63232 63232 62866floor wall wall wall wall wall floor

N/A ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100N/A ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0N/A ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0N/A ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

ND<1.0 N/A N/A N/A N/A N/A N/AND<5.0 N/A N/A N/A N/A N/A N/A




Page 34 of 54


Units

V-B4-W2 V-B4-W2 V-B4-W2 V-B4-W2 V-C1-F6 V-C1-F6 V-C1-F7V-B4-W2-0-2 DUP-090211-1 V-B4-W2-2-3.5 V-B4-W2-3.5-5 DUP-081711-1 V-C1-F6-10 V-C1-F7-17

V-B4-W2-0-2 V-C1-F6-100-2 0-2 2-3.5 3.5-5 10 10 17

9/2/2011 9/2/2011 9/2/2011 9/2/2011 8/17/2011 8/17/2011 8/17/201162866 62866 62866 62866 62654 62654 62654wall wall wall wall floor floor floor

ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100 ND<0.100 58ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 1220ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 1990ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 773

N/A N/A N/A N/A ND<1.0 ND<1.0 ND<5N/A N/A N/A N/A ND<5.0 ND<5.0 ND<25




Page 35 of 54


Units

V-C1-W1 V-C1-W2 V-C1-W2 V-C1-W2 V-C1-W2 V-C3-F3 V-C4-F2V-C1-W1-8-10 V-C1-W2-3.5 V-C1-W2-5.5 V-C1-W2-7.5 V-C1-W2-8-10 V-C3-F3-3 V-C4-F2-11

8-10 3.5 5.5 7.5 8-10 3 118/3/2011 8/4/2011 8/4/2011 8/4/2011 8/4/2011 8/30/2011 9/1/2011

62434 62471 62471 62471 62471 62816 62857wall wall wall wall wall floor floor

ND<0.100 N/A N/A N/A N/A N/A ND<0.100ND<1.0 N/A N/A N/A N/A N/A ND<1.0ND<1.0 N/A N/A N/A N/A N/A ND<1.0ND<1.0 N/A N/A N/A N/A N/A ND<1.0

ND<1.0 ND<1.0 ND<1.0 1.96Ja 4.37Ja ND<1.0 ND<1.0ND<5.0 ND<5.0 ND<5.0 ND<5.0 14.8 ND<5.0 ND<5.0


TABLE 3-3Summary of Confirmation Onsite Soil Analytical Results for Metals and Cyanide


Page 36 of 54

Location ID A4-B2 A4-B3 A4-B3 A5-B3 A5-B3 A5-B3 A5-B3 A5-B3 A5-B3Sample ID A4-B2 S02 A4-B3 S01 A4-B3 S02 A5-B3-S09 A5-B3-S11 A5-B3-S12 A5-B3-S13 A5-B3-S14 A5-B3-S15Duplicate Sample IDSample Depth/Interval 2-3.5 1.5-3 3-4.5 14-16 18-20 20-22 22-24 24-25.25 25.25-26.5Sample Date 7/19/2007 7/19/2007 7/19/2007 1/9/2008 1/9/2008 1/9/2008 1/9/2008 1/9/2008 1/9/2008Laboratory Job Number 43206 43226 43226 45617 45617 45840 45840 45840 45840Sample Location: F (floor), W (wall), BH (borehole) BH BH BH BH BH BH BH BH BHMetals USEPA Method 6010B/7000CAMAntimony mg/kg ND<1.0 ND<1.0 ND<1.0 N/A N/A N/A N/A N/A N/AArsenic mg/kg ND<1.0 ND<1.0 ND<1.0 N/A N/A N/A N/A N/A N/ABarium mg/kg 166 165 133 N/A N/A N/A N/A N/A N/ABeryllium mg/kg ND<1.3 ND<1.3 ND<1.3 N/A N/A N/A N/A N/A N/ACadmium mg/kg ND<1.3 ND<1.3 ND<1.3 N/A N/A N/A N/A N/A N/AChromium mg/kg 16.1 16 15.4 N/A N/A N/A N/A N/A N/ACobalt mg/kg 9.5 13.1 8.85 N/A N/A N/A N/A N/A N/ACopper mg/kg 12.4 12.1 12.2 N/A N/A N/A N/A N/A N/ALead mg/kg 3.50J 3.65J 3.20J N/A N/A N/A N/A N/A N/AMercury (By EPA 7471) mg/kg ND<0.1 ND<0.1 ND<0.1 N/A N/A N/A N/A N/A N/AMolybdenum mg/kg ND<2.5 ND<2.5 ND<2.5 N/A N/A N/A N/A N/A N/ANickel mg/kg 8.95 8.15 8.3 N/A N/A N/A N/A N/A N/ASelenium mg/kg ND<1.0 ND<1.0 ND<1.0 N/A N/A N/A N/A N/A N/ASilver mg/kg ND<2.5 ND<2.5 ND<2.5 N/A N/A N/A N/A N/A N/AThallium mg/kg ND<1.0 ND<1.0 ND<1.0 N/A N/A N/A N/A N/A N/AVanadium mg/kg 47.4 46.7 44.6 N/A N/A N/A N/A N/A N/AZinc mg/kg 38.6 49 37.1 N/A N/A N/A N/A N/A N/AMetals USEPA Method 6010B-SCANArsenic mg/Kg N/A N/A N/A ND<2.5 23.3 ND<2.5 ND<2.5 ND<2.5 ND<2.5Cyanide USEPA Method 9010/9010BCyanide (Total) mg/kg N/A N/A N/A N/A N/A N/A N/A N/A N/A

Notes:1) PAHs= POLYCYCLIC AROMATIC HYDROCARBONS, USEPA METHOD 8310.2) "ND<" INDICATES CONSTITUENT(S) NOT DETECTED AT OR ABOVE LABORATORY DETECTION LIMIT.3) YELLOW HIGHLIGHT INDICATE CARCINOGENIC PAHs USED TO CALCULATE BENZO(A)PYRENE (B(a)P) EQUIVALENT CONCENTRATION.4) "J" INDICATES ANALYTE WAS DETECTED. HOWEVER, THE ANALYTE CONCENTRATION IS AN ESTIMATED VALUE, WHICH IS BETWEEN THE METHOD DETECTION LIMIT (MDL) AND THE PRACTICAL QUANTITATION LIMIT(PQL).5) mg/kg = MILLIGRAMS PER KILOGRAM6) bgs = BELOW GROUND SURFACE7) ID = IDENTIFICATION8) USEPA = UNITED STATE ENVIRONMENTAL PROTECTION AGENCY9) "J-" INDICATES RESULT IS ESTIMATED FOR POTENTIAL LOW BIAS.

Units



Page 37 of 54

Location IDSample IDDuplicate Sample IDSample Depth/IntervalSample DateLaboratory Job NumberSample Location: F (floor), W (wall), BH (borehole)Metals USEPA Method 6010B/7000CAMAntimony mg/kgArsenic mg/kgBarium mg/kgBeryllium mg/kgCadmium mg/kgChromium mg/kgCobalt mg/kgCopper mg/kgLead mg/kgMercury (By EPA 7471) mg/kgMolybdenum mg/kgNickel mg/kgSelenium mg/kgSilver mg/kgThallium mg/kgVanadium mg/kgZinc mg/kgMetals USEPA Method 6010B-SCANArsenic mg/KgCyanide USEPA Method 9010/9010BCyanide (Total) mg/kg

Units

A5-B3 B3-B1 B-MAD-1 B-MAD-1 B-MAD-1 C1-B1 C1-B4 C2-B1A5-B3-S16 B3-B1 S03 B-MAD-1-5.0-6.5A B-MAD-1-10.0-11.5A B-MAD-1-18.0 C1-B1 S03 C1-B4-S08 C2-B1 S02

28-30 3.5-5 5-6.5 10-11.5 18- 2-3.5 14.5-16 2-3.51/9/2008 7/19/2007 2/4/1991 2/4/1991 2/11/1991 7/18/2007 1/10/2008 7/19/2007

45840 43226 43204 45578 43226BH BH BH BH BH BH BH BH

N/A N/A ND<4.90 ND<7.40 ND<4.90 ND<1.0 ND<1.0 ND<1.0N/A N/A ND<3.00 ND<3.00 ND<3.00 ND<1.0 ND<1.0 ND<1.0N/A N/A 162 57.7 166 118 75.3 191N/A N/A ND<0.24 ND<0.25 ND<0.25 ND<1.3 ND<1.3 ND<1.3N/A N/A ND<2.40 ND<2.50 ND<2.50 ND<1.3 ND<1.3 ND<1.3N/A N/A 20 8 27.8 12 8.65 18.4N/A N/A 9.4 ND<4.90 11 7.5 6.6 8.65N/A N/A 13 ND<5.10 13 9.9 11.8 15.6N/A N/A ND<7.30 ND<7.40 7.5 ND<2.5 3.90J 3.90JN/A N/A ND<0.10 ND<0.10 ND<0.10 ND<0.1 ND<0.1 ND<0.1N/A N/A ND<4.90 ND<4.90 ND<4.90 ND<2.5 ND<2.5 ND<2.5N/A N/A 13 6.1 17 7.45 6.35 10.4N/A N/A ND<3.00 ND<3.00 ND<3.00 ND<1.0 ND<1.0 ND<1.0N/A N/A ND<2.40 ND<2.50 ND<2.50 ND<2.5 ND<2.5 ND<2.5N/A N/A ND<10.0 ND<10.0 ND<10.0 ND<1.0 ND<1.0 ND<1.0N/A N/A 47.5 22 56.2 36.1 19.1 54N/A N/A 47.2 22 58.8 33.4 33.4 53

ND<2.5 N/A N/A N/A N/A N/A N/A N/A

N/A ND<0.50 ND<2.00 ND<2.00 ND<2.00 N/A ND<0.50 N/A




Page 38 of 54


Units

C2-T1 C3-T1 C3-T1 C4-B1 C4-B2 MW06 MW06 MW-MAD-1 MW-MAD-1C2-T1 S05 C3-T1 S04 C3-T1 S05 C4-B1 S02 C4-B2 S02 MW-06-S01 MW-06-S02 MW-MAD-1-5-6.5A MW-MAD-1-10-11.5A

5-6.5 4-5.3 5.3-6.5 2-3.5 2-3.5 0.5-2 2-3.5 5-6.5 10-11.57/20/2007 7/20/2007 7/20/2007 7/19/2007 7/19/2007 7/30/2007 7/30/2007 2/6/1991 2/6/1991

43233 43225 43225 43206 43206 43382 43382BH BH BH BH BH BH BH BH BH

ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<5.00 ND<5.00ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 7.4 ND<1.0 3 ND<3.00

170 126 76.5 160 142 136 125 127 76.7ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<0.25 ND<0.25ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<2.50 ND<2.50

15.4 14.1 10.1 17.3 15.7 14.2 12.5 25.8 9.98.9 7.65 5.3 11.3 9.1 6.05 7.55 9.9 5.8

14.5 11.5 5.15 14 12.3 58 9 13 6.83.25J 3.25J 3.20J 4.05J 3.05J 67 ND<2.5 ND<7.50 ND<7.50


9.05 7.8 6.45 11.6 8.5 7.55 7.05 16 9.5ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<3.00 ND<3.00ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.50 ND<2.50ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<10.0 ND<10.0

45.6 40.4 21.8 51 46.3 29.4 37.8 44.7 2538.6 30.8 15.5 56 39.7 245 35.3 38.5 31.6

N/A N/A N/A N/A N/A N/A N/A N/A N/A

ND<0.50 ND<0.50 ND<0.50 N/A N/A N/A N/A ND<2.00 ND<2.00




Page 39 of 54


Units

MW-MAD-1 MW-MAD-2 MW-MAD-2 MW-MAD-3 MW-MAD-3 PT1 PT6MW-MAD-1-84-85.5A MW-MAD-2-10-11.5A MW-MAD-2-84-85.5A MW-MAD-3-10-11.5A MW-MAD-3-85.0A PT1-5-6.5 PT6-3.5-5

84-85.5 10-11.5 84-85.5 10-11.5 85- 5-6.5 3.5-52/6/1991 2/6/1991 2/6/1991 2/4/1991 2/4/1991 7/26/2011 7/27/2011

62230 62238BH BH BH BH BH

ND<4.90 ND<5.00 ND<4.90 ND<4.90 ND<4.90 N/A N/AND<3.00 ND<3.00 ND<3.00 33 9 N/A N/A

43.5 90.6 47.9 100 45.5 N/A N/AND<0.25 ND<0.25 ND<0.24 ND<0.25 ND<0.24 N/A N/AND<2.50 ND<2.50 ND<2.40 ND<2.50 ND<2.40 N/A N/A

3.4 15 5.5 15 6 N/A N/AND<4.90 6.6 ND<4.90 7.1 ND<4.90 N/A N/A

4.6 7.5 5.3 8.6 ND<5.60 N/A N/AND<7.40 ND<7.50 ND<7.50 ND<7.40 ND<7.30 N/A N/AND<0.10 ND<0.10 ND<0.10 ND<0.10 ND<0.10 N/A N/AND<4.90 ND<5.00 ND<4.90 ND<4.90 ND<4.90 N/A N/AND<4.90 13 8.3 22 6.8 N/A N/A

4 ND<3.00 ND<3.00 ND<3.00 ND<3.00 N/A N/AND<2.50 ND<2.50 ND<2.40 ND<2.50 ND<2.40 N/A N/AND<10.0 ND<10.0 ND<10.0 ND<10.0 ND<10.0 N/A N/A

15 25.3 19 28.9 17 N/A N/A25.2 32.3 23 33.5 26.2 N/A N/A

N/A N/A N/A N/A N/A ND<2.5 11.2

ND<2.00 ND<2.00 ND<2.00 ND<2.00 ND<2.00 N/A N/A




Page 40 of 54


Units

V-A1-F1 V-A1-F1 V-A1-F2 V-A1-F3 V-A1-F3 V-A1-F4 V-A1-F4 V-A1-W3 V-A2-F1V-A1-F1-2 DUP-090611-1 V-A1-F2-3 V-A1-F3-4 DUP-090711-1 V-A1-F4-2 DUP-092711-1 V-A1-W3-2-3 V-A2-F1-3.5

V-A1-F1-2 V-A1-F3-4 V-A1-F4-22 2 3 4 4 2 2 2-3 3.5

9/6/2011 9/6/2011 9/6/2011 9/7/2011 9/7/2011 9/27/2011 9/27/2011 9/7/2011 8/12/201162883 62883 62883 62896 62896 63154 63154 62896 62617floor floor floor floor floor floor floor wall floor

ND<1.0 ND<1.0 ND<1.0 ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

155 171 136 138 130 156J- 128J- 141 105ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3

14.3 16.1 13.8 11.8 12.1 13.5 11.1 11.8 10.59.35 9.8 9.29 7.98 8.27 9.46 7.63 7.82 5.548.54 9.93 9.95 6.23 6.33 8.71 7.06 6.56 24.6

ND<2.5 2.80J ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5

8.62 9.15 6.74 6.69 7.21 8.03 6.6 6.34 4.26JND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5ND<1.0 ND<1.0 ND<1.0 ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0

43.6 48.2 41.6 37.8 38.7 44.5 36.2 37.3 3340.9 41.2 36.9 34.8 34 40.3 32.8 34.1 31.1






Page 41 of 54


Units

V-A2-F2 V-A2-F3 V-A2-F4 V-A2-F7 V-A2-F10 V-A2-W9 V-A2-W9 V-A2-W10 V-A2-W10V-A2-F2-8 V-A2-F3-5 V-A2-F4-5.5 V-A2-F7-32 V-A2-F10-16 V-A2-W9-11 V-A2-W9-5 V-A2-W10-22 V-A2-W10-28

8 5 5.5 32 16 11 5 22 289/6/2011 9/7/2011 9/7/2011 9/30/2011 9/29/2011 9/29/2011 9/29/2011 9/30/2011 9/30/2011

62883 62896 62896 63209 63198 63198 63198 63209 63209floor floor floor floor floor wall wall wall wall

ND<1.0 ND<1.0J- ND<1.0J- ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

77.4 133 116 17 39.4 44.7 122 30.8 129ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3

9.61 12.5 13.4 2.70J 4.16J 5.45 10.2 3.05J 12.14.90J 5.22 10.7 ND<2.5 3.19J 4.08J 5.72 2.95J 11.63.10J 5.41 7.38 ND<2.5 ND<2.5 2.72J 5.61 ND<2.5 5.2

ND<2.5 3.26J 4.00J ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5

5.02 6.01 10.8 ND<2.5 2.51J 3.82J 5.54 2.60J 6.83ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5ND<1.0 ND<1.0J- ND<1.0J- ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

25.3 36.4 42.1 5.2 18.6 18.6 34.2 14.7 40.623.1 29.4 33.9 5.9 13.9 16.1 42.7 12.5 41.8






Page 42 of 54


Units

V-A2-W11 V-A2-W11 V-A2-W11 V-A2-W11 V-A2-W11 V-A2-W11 V-A2-W11 V-A3-F1V-A2-W11-5 V-A2-W11-10 V-A2-W11-16 V-A2-W11-22 DUP-100411-1 V-A2-W11-28 DUP-100411-2 V-A3-F1-15

V-A2-W11-22 V-A2-W11-285 10 16 22 22 28 28 15

10/3/2011 10/3/2011 10/3/2011 10/4/2011 10/4/2011 10/4/2011 10/4/2011 8/9/201163232 63232 63232 63243 63243 63243 63243 62573wall wall wall wall wall wall wall floor

ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J-ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

91.9 69 30.7 75.7 79 161 121 46.8ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3

10 8.44 3.60J 7.3 7.94 14.9 14.5 4.34J6.33 4.71J 2.80J 5.72 6.05 13.3 8.31 3.03J

4.27J 3.44J ND<2.5 2.67J 2.72J 7.31 6.02 ND<2.52.76J ND<2.5 ND<2.5 ND<2.5 ND<2.5 3.51J ND<2.5 ND<2.5

ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1ND<2.5J- ND<2.5J- ND<2.5J- ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5

9.52 5.48 ND<2.5 4.40J 4.63J 9.62 7.37 2.96JND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5

ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J-25.4 22.7 13.8 27.4 28.4 55.1 40.1 14.821.6 22.1 14 26 28.7 47.8 43.6 12.7

N/A N/A N/A N/A N/A N/A N/A N/A





Page 43 of 54


Units

V-A3-F3 V-A3-F4 V-A3-W6 V-A3-W6 V-A3-W7 V-A3-W7 V-A3-W14 V-A3-W14V-A3-F3-12 V-A3-F4-16 V-A3-W6-5-6.5 V-A3-W6-9-10 V-A3-W7-5-6.5 V-A3-W7-9-10 V-A3-W14-22 V-A3-W14-28

12 16 5-6.5 9-10 5-6.5 9-10 22 2810/4/2011 9/13/2011 8/10/2011 8/10/2011 8/10/2011 8/10/2011 10/3/2011 10/3/2011

63243 62966 62590 62590 62590 62590 63232 63232floor floor wall wall wall wall wall wall

ND<1.0J- ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0J- ND<1.0J-ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

57.8 75.5 106 54.7 103 57.1 120 44.7ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3

5.49 7.93 8.22 6.05 12.1 6.9 13.8 3.84J4.38J 5.72 4.93J 3.81J 6.8 6.17 8.93 3.89J2.66J 4.47J 4.38J 2.90J 6.28 3.92J 6.11 ND<2.5

ND<2.5 ND<2.5 ND<2.5 ND<2.5 3.63J 3.05J 2.55J ND<2.5ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5J- ND<2.5J-3.65J 4.47J 8.57 3.58J 6.47 6.2 9.19 ND<2.5

ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5

ND<1.0J- ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0J- ND<1.0J-21.7 32.4 21.4 18.3 35.6 17 39.3 16.818.4 25.7 19 16.7 24.8 13.7 42.2 17.5






Page 44 of 54


Units

V-A3-W15 V-A3-W15 V-A4-F1 V-A4-F1 V-A4-F2 V-A4-F2 V-A4-F3 V-A4-F3 V-A4-W3V-A3-W15-6 V-A3-W15-10 V-A4-F1-5 DUP-080911-1 V-A4-F2-13 DUP-081511-1 V-A4-F3-2 DUP-100411-3 V-A4-W3-0-2

V-A4-F1-5 V-A4-F2-13 V-A4-F3-26 10 5 5 13 13 2 2 0-2

10/4/2011 10/4/2011 8/9/2011 8/9/2011 8/15/2011 8/15/2011 10/4/2011 10/4/2011 8/11/201163243 63243 62573 62573 62632 62632 63243 63243 62604wall wall floor floor floor floor floor floor wall

ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- N/AND<1.0 ND<1.0 5.3 4.40J ND<1.0 ND<1.0 ND<1.0 ND<1.0 N/A

50.4 57.2 126 136 121 94.9 129 127 N/AND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 N/AND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 N/A

7.14 5.79 11.8 12.4 10.4 9.63 14.1 13.6 N/A4.33J 4.17J 6.41 6.87 6.83 5.96 8.7 8.51 N/A3.36J 2.55J 3.80J 4.05J 5.38 4.76J 7.74 7.33 N/A

ND<2.5 ND<2.5 4.00J 4.33J ND<2.5 ND<2.5 ND<2.5 ND<2.5 N/AND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 N/AND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 N/A

5.26 3.52J 12.7 13.4 6.83 6.25 7.8 7.44 N/AND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 N/AND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 N/A

ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0 ND<1.0 ND<1.0J- ND<1.0J- N/A21.8 22.1 27 29.1 27.6 24.1 42.1 41.1 N/A18.8 18.5 17.5 18.5 34.6 29 36 35.2 N/A

N/A N/A 5.34 4.21J N/A N/A N/A N/A ND<2.5





Page 45 of 54


Units

V-A4-W3 V-A4-W3 V-A4-W4 V-A4-W4 V-A4-W4 V-A4-W4 V-A4-W5 V-A4-W5V-A4-W3-2-3.5 V-A4-W3-3.5-5 DUP-081111-1 V-A4-W4-0-2 V-A4-W4-2-3.5 V-A4-W4-3.5-5 V-A4-W5-0-2 DUP-091311-1

V-A4-W4-3.5-5 V-A4-W5-0-22-3.5 3.5-5 3.5-5 0-2 2-3.5 3.5-5 0-2 0-2

8/11/2011 8/11/2011 8/11/2011 8/11/2011 8/11/2011 8/11/2011 9/13/2011 9/13/201162604 62604 62604 62604 62604 62604 62966 62966wall wall wall wall wall wall wall wall

N/A N/A N/A N/A N/A N/A ND<1.0 ND<1.0N/A N/A N/A N/A N/A N/A ND<1.0 ND<1.0N/A N/A N/A N/A N/A N/A 117 117N/A N/A N/A N/A N/A N/A ND<1.3 ND<1.3N/A N/A N/A N/A N/A N/A ND<1.3 ND<1.3N/A N/A N/A N/A N/A N/A 11.7 12.1N/A N/A N/A N/A N/A N/A 7.74 7.82N/A N/A N/A N/A N/A N/A 6.76 6.88N/A N/A N/A N/A N/A N/A ND<2.5 ND<2.5N/A N/A N/A N/A N/A N/A ND<0.1 ND<0.1N/A N/A N/A N/A N/A N/A ND<2.5 ND<2.5N/A N/A N/A N/A N/A N/A 6.59 6.65N/A N/A N/A N/A N/A N/A ND<1.0 ND<1.0N/A N/A N/A N/A N/A N/A ND<2.5 ND<2.5N/A N/A N/A N/A N/A N/A ND<1.0 ND<1.0N/A N/A N/A N/A N/A N/A 36.1 36.2N/A N/A N/A N/A N/A N/A 32 32.1

ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 N/A N/A





Page 46 of 54


Units

V-A4-W5 V-A4-W7 V-A4-W7 V-A4-W7 V-A4-W11 V-A4-W12 V-A5-F1 V-A5-F1V-A4-W5-7 V-A4-W7-0.5-2 V-A4-W7-2-3.5 V-A4-W7-3.5-5 V-A4-W11-0-1.5 V-A4-W12-0-1.5 V-A5-F1-10 DUP-080811-2

V-A5-F1-107 0.5-2 2-3.5 3.5-5 0-1.5 0-1.5 10 10

9/13/2011 9/16/2011 9/16/2011 9/16/2011 10/7/2011 10/7/2011 8/8/2011 8/8/201162966 63031 63031 63031 63323 63323 62541 62541wall wall wall wall wall wall floor floor

ND<1.0 ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0 ND<1.0 ND<1.0J- ND<1.0J-ND<1.0 8.6 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

148 177 115 123 93.7 109 88.2J- 110J-ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3

9.68 14.3 10.4 12 8.35 10.1 7 8.2711.5 8.89 6.96 7.26 4.38J 7.18 5.15 5.01

4.69J 7.61 6.98 6.58 5.07 6.34 2.70J 2.83JND<2.5 2.82J 2.53J 3.06J ND<2.5 ND<2.5 ND<2.5 ND<2.5ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5

11.1 8.82 6.39 6.47 4.13J 5.93 4.11J 4.36JND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5ND<1.0 ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0 ND<1.0 ND<1.0J- ND<1.0J-

24.7 44.9 40.9 37.4 27.1 31.8 25.1 26.427.8 41 29 25 29.7 34.6 21.4 23.5






Page 47 of 54


Units

V-A5-F2 V-A5-F3 V-A5-F4 V-A5-F5 V-B1-F1 V-B1-F2 V-B1-W1 V-B1-W1 V-B1-W1V-A5-F2-10 V-A5-F3-10 V-A5-F4-10 V-A5-F5-6.5 V-B1-F1-3.5 V-B1-F2-5 V-B1-W1-3.5-5 V-B1-W1-5-6.5 V-B1-W1-8-10

10 10 10 5-6.5 3.5 5 3.5-5 5-6.5 8-108/8/2011 8/8/2011 8/15/2011 8/9/2011 8/24/2011 9/7/2011 8/8/2011 8/8/2011 8/8/2011

62541 62541 62632 62573 62759 62896 62541 62541 62541floor floor floor floor floor floor wall wall wall

ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0 ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J-13.2J- ND<1.0 ND<1.0 5.5 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0128J- 96.1J- 66.1 123 158 169 124J- 87.3J- 51.8J-


11.9 8.88 6.18 9.58 14.6 13 12.1 7.9 3.86J7.2 5.34 3.75J 6.07 10.4 8.27 6.57 6.29 4.41J

5.06 3.13J ND<2.5 2.78J 8.85 11.1 10.6 4.09J ND<2.52.90J ND<2.5 ND<2.5 ND<2.5 2.76J 3.50J ND<2.5 ND<2.5 ND<2.5


8.21 4.88J 2.88J 6.96 7.88 8.11 5.73 4.44J 3.18JND<1.0 ND<1.0 ND<1.0 1.10J ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5

ND<1.0J- ND<1.0J- ND<1.0 ND<1.0J- ND<1.0 ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J-33.3 23.5 18.6 26.8 43.7 44.1 37.8 35.1 23.927.9 22.1 17.3 22.3 41.3 47 38 27.6 18.7

N/A N/A N/A 5.48 N/A N/A N/A N/A N/A





Page 48 of 54


Units

V-B1-W3 V-B1-W3 V-B1-W5 V-B1-W5 V-B2-F1 V-B2-F1 V-B2-F2 V-B2-W3V-B1-W3-5-6 V-B1-W3-9-10 V-B1-W5-5-6 V-B1-W5-9-10 V-B2-F1-4 DUP-082411-1 V-B2-F2-8 V-B2-W3-9

V-B2-F1-45-6 9-10 5-6 9-10 4 4 8 9

8/18/2011 8/18/2011 8/26/2011 8/26/2011 8/24/2011 8/24/2011 9/1/2011 9/29/201162665 62665 62782 62782 62759 62759 62857 63198wall wall wall wall floor floor floor wall

ND<1.0J- ND<1.0J- ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0J- ND<1.0ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

109 39.8 123 36.2 125 135 72.6 63.8ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3

11 5.74 12.5 5.09 12.6 12.6 7.2 6.026.85 ND<2.5 6.4 ND<2.5 9.08 8.7 5.43 3.50J8.25 2.60J 7.49 2.63J 7.27 7.48 3.01J ND<2.5

ND<2.5 ND<2.5 ND<2.5 ND<2.5 2.55J 2.66J ND<2.5 ND<2.5ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5

5.72 3.42J 9.32 3.74J 7.61 7.38 6.1 3.39JND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5

ND<1.0J- ND<1.0J- ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.038.1 14.8 40.5 14 40.8 39.8 18.1 17.831.3 11.8 46.6 11.4 34.4 34 15.2 15


N/A N/A N/A N/A N/A N/A ND<0.50 N/A




Page 49 of 54


Units

V-B2-W3 V-B2-W3 V-B2-W4 V-B2-W4 V-B3-F1 V-B3-F2 V-B4-F1 V-B4-W1 V-B4-W1DUP-092911-1 V-B2-W3-16 V-B2-W4-22 V-B2-W4-28 V-B3-F1-2 V-B3-F2-2 V-B4-F1-5 V-B4-W1-0-2 V-B4-W1-2-3.5

V-B2-W3-99 16 22 28 2 2 15 0-2 2-3.5

9/29/2011 9/29/2011 10/3/2011 10/3/2011 9/6/2011 9/6/2011 9/2/2011 8/15/2011 8/15/201163198 63198 63232 63232 62883 62883 62866 62632 62632wall wall wall wall floor floor floor wall wall

ND<1.0 ND<1.0 ND<1.0J- ND<1.0J- ND<1.0 ND<1.0 ND<1.0J- ND<1.0J- ND<1.0J-ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

76.2 42 125 61.7 151 168 166 47.8 133ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3

6.02 2.90J 15 6.62 14.6 16.5 13.1 7.08 13.23.71J 2.98J 8.5 4.67J 9.61 10.4 7.94 3.98J 8.482.55J ND<2.5 8.76 ND<2.5 8.51 9.8 6.79 3.58J 7.15

ND<2.5 ND<2.5 ND<2.5 ND<2.5 2.71J 2.72J 3.09J 2.77J 2.61JND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1ND<2.5 ND<2.5 ND<2.5J- ND<2.5J- ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.53.91J ND<2.5 7.95 3.35J 8.5 9.56 7.15 4.39J 7.23

ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5ND<1.0 ND<1.0 ND<1.0J- ND<1.0J- ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

18.9 13.8 36.4 23.8 44.1 48.2 39.1 15.7 41.616.3 19 43.1 24.1 38.8 42 30.6 11 34.7






Page 50 of 54


Units

V-B4-W1 V-B4-W2 V-B4-W2 V-B4-W2 V-B4-W2 V-B5-F1 V-B5-F2 V-B5-F3 V-B5-W3V-B4-W1-3.5-5 V-B4-W2-0-2 DUP-090211-1 V-B4-W2-2-3.5 V-B4-W2-3.5-5 V-B5-F1-10 V-B5-F2-6 V-B5-F3-3 V-B5-W3-2-3.5

V-B4-W2-0-23.5-5 0-2 0-2 2-3.5 3.5-5 10 6 3 2-3.5

8/15/2011 9/2/2011 9/2/2011 9/2/2011 9/2/2011 8/22/2011 8/29/2011 8/31/2011 8/25/201162632 62866 62866 62866 62866 62697 62803 62837 62774wall wall wall wall wall floor floor floor wall

ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- N/A N/A ND<1.0ND<1.0 ND<1.0 ND<1.0 13.7 ND<1.0 13.7 N/A N/A 4.87J

120 56.7 53.7 150 112 54.3 N/A N/A 124ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 N/A N/A ND<1.3ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 N/A N/A ND<1.3

12.5 8.19 8.04 14.4 12.9 5.24 N/A N/A 10.18.09 4.49J 4.20J 8.85 8.3 4.23J N/A N/A 6.916.65 4.49J 4.20J 7.88 6.74 3.20J N/A N/A 6.38

ND<2.5 3.03J 2.81J 2.52J ND<2.5 ND<2.5 N/A N/A ND<2.5ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 N/A N/A ND<0.1ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 N/A N/A ND<2.5

6.99 5.15 4.98J 8.09 6.94 3.63J N/A N/A 5.54ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 N/A N/A ND<1.0ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 N/A N/A ND<2.5ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0J- N/A N/A ND<1.0

38.2 18.6 18 45.9 40.4 17.5 N/A N/A 32.532.2 13.1 12.8 36.9 34.3 15.6 N/A N/A 37.9

N/A N/A N/A N/A N/A N/A ND<2.5 ND<2.5 4.51J





Page 51 of 54


Units

V-B5-W3 V-B5-W6 V-B5-W7 V-B5-W7 V-B5-W8 V-B5-W8 V-C1-F5 V-C1-F6V-B5-W3-3.5-5 V-B5-W6-2-3.5 V-B5-W7-0.5-2 V-B5-W7-2-3 V-B5-W8-0.5-2 V-B5-W8-2-3 V-C1-F5-6 DUP-081711-1

V-C1-F6-103.5-5 2-3.5 0.5-2 2-3 0.5-2 2-3 6 10

8/25/2011 8/29/2011 8/31/2011 8/31/2011 9/7/2011 9/7/2011 8/16/2011 8/17/201162774 62803 62837 62837 62896 62896 62642 62654wall wall wall wall wall wall floor floor

ND<1.0 N/A N/A N/A ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J-6.54 N/A N/A N/A 5.94 5.58 ND<1.0 ND<1.0120 N/A N/A N/A 101 141 134 50.8

ND<1.3 N/A N/A N/A ND<1.3 ND<1.3 ND<1.3 ND<1.3ND<1.3 N/A N/A N/A ND<1.3 ND<1.3 ND<1.3 ND<1.3

9.93 N/A N/A N/A 8.86 9.12 13.9 3.17J7.07 N/A N/A N/A 6.28 6.83 7.2 3.33J6.37 N/A N/A N/A 8.07 6.92 7.31 ND<2.5

ND<2.5 N/A N/A N/A 8.11 12.7 2.51J ND<2.5ND<0.1 N/A N/A N/A ND<0.1 ND<0.1 ND<0.1 ND<0.1ND<2.5 N/A N/A N/A ND<2.5 ND<2.5 ND<2.5 ND<2.5

5.55 N/A N/A N/A 5.54 5.84 7.55 ND<2.5ND<1.0 N/A N/A N/A ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<2.5 N/A N/A N/A ND<2.5 ND<2.5 ND<2.5 ND<2.5ND<1.0 N/A N/A N/A ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J-

33.2 N/A N/A N/A 27.5 30.1 47.5 16.337 N/A N/A N/A 57.3 58.2 36 16.2

5.79 ND<2.5 ND<2.5 ND<2.5 N/A N/A N/A N/A





Page 52 of 54


Units

V-C1-F6 V-C1-F7 V-C1-W1 V-C1-W2 V-C1-W2 V-C1-W2 V-C1-W2 V-C1-W3 V-C1-W5V-C1-F6-10 V-C1-F7-17 V-C1-W1-8-10 V-C1-W2-3.5 V-C1-W2-5.5 V-C1-W2-7.5 V-C1-W2-8-10 V-C1-W3-3-4 V-C1-W5-2-2.5

10 17 8-10 3.5 5.5 7.5 8-10 3-4 2-2.58/17/2011 8/17/2011 8/3/2011 8/4/2011 8/4/2011 8/4/2011 8/4/2011 8/10/2011 8/10/2011

62654 62654 62434 62471 62471 62471 62471 62590 62590floor floor wall wall wall wall wall wall wall

ND<1.0 ND<1.0J- ND<1.0J- ND<1.0U ND<1.0U ND<1.0U ND<1.0U ND<1.0J- ND<1.0J-ND<1.0 ND<1.0 ND<1.0 ND<1.0U ND<1.0U ND<1.0U ND<1.0U ND<1.0 ND<1.0

51.8 155 34.2J- 159 152 80.8 60.6 153 157ND<1.3 ND<1.3 ND<1.3 ND<1.3U ND<1.3U ND<1.3U ND<1.3U ND<1.3 ND<1.3ND<1.3 ND<1.3 ND<1.3 ND<1.3U ND<1.3U ND<1.3U ND<1.3U ND<1.3 ND<1.34.15J 13.9 3.10J 11.5 12.8 8.44 5.26 13.4 13.93.55J 9.52 3.10J 7.27 8.4 6.19 4.39J 7.94 6.87

ND<2.5 7.88 ND<2.5 8.43 9.74 3.36J 4.80J 8.19 7.33ND<2.5 3.31J ND<2.5 3.93J ND<2.5U ND<2.5U 7.9 ND<2.5 ND<2.5ND<0.1 ND<0.1 ND<0.1 ND<0.1U ND<0.1U ND<0.1U ND<0.1U ND<0.1 ND<0.1ND<2.5 ND<2.5 ND<2.5 ND<2.5U ND<2.5U ND<2.5U ND<2.5U ND<2.5 ND<2.52.60J 10.3 ND<2.5 6.72 7.88 4.68J 3.11J 7.91 6.53

ND<1.0 ND<1.0 ND<1.0 ND<1.0U ND<1.0U ND<1.0U ND<1.0U ND<1.0 ND<1.0ND<2.5 ND<2.5 ND<2.5 ND<2.5U ND<2.5U ND<2.5U ND<2.5U ND<2.5 ND<2.5ND<1.0 ND<1.0J- ND<1.0J- ND<1.0U ND<1.0U ND<1.0U ND<1.0U ND<1.0J- ND<1.0J-

17.4 40.6 15.3 35.2 54.3 33.2 22.6 40.2 41.416.7 48.9 13.9 34.8 36.9 29.6 24.1 38.4 44.7

N/A N/A N/A N/A N/A N/A N/A ND<2.5 ND<2.5





Page 53 of 54


Units

V-C2-F1 V-C2-F3 V-C2-F4 V-C2-W4 V-C2-W4 V-C3-F1 V-C3-F1 V-C3-F2V-C2-F1-4.5 V-C2-F3-3.5 V-C2-F4-3 V-C2-W4-2-3.5 V-C2-W4-3.5-5 V-C3-F1-3 DUP-082511-1 V-C3-F2-3

V-C3-F1-34.5 3.5 3 2-3.5 3.5-5 3 3 3

8/22/2011 8/19/2011 8/31/2011 8/22/2011 8/22/2011 8/25/2011 8/25/2011 8/30/201162697 62678 62837 62697 62697 62774 62774 62816floor floor floor wall wall floor floor floor

ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0 ND<1.0 ND<1.0ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

144 144 176 155 127 151 152 128ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3

14.7 13.5 15.4 14 13.5 14.8 14.7 12.59.17 8.64 9.33 9.42 8.8 9.13 9.24 7.878.89 8.44 14.5 8.89 8.03 9.94 9.7 7.13

2.92J ND<2.5 ND<2.5 ND<2.5 ND<2.5 2.84J 2.95J ND<2.5ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5

8.61 7.87J- 7.31 7.79 7.78 7.63 7.57 7.13ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5

ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0J- ND<1.0 ND<1.0 ND<1.046.1 41.8 48.1 44.9 40.5 44.3 43.4 37.939.6 38.2 42.1 53 35.4 66.6 64.5 32.1






Page 54 of 54


Units

V-C3-F2 V-C3-F3 V-C4-F1 V-C4-F2 V-C4-F3 V-C4-W4 V-C4-W5DUP-083011-1 V-C3-F3-3 V-C4-F1-2 V-C4-F2-11 V-C4-F3-1.5 V-C4-W4-0.5-2 V-C4-W5-0-1.5

V-C3-F2-33 3 2 11 1.5 0.5-2 0-1.5

8/30/2011 8/30/2011 8/30/2011 9/1/2011 9/12/2011 9/6/2011 9/12/201162816 62816 62816 62857 62943 62883 62943floor floor floor floor floor wall wall

ND<1.0 ND<1.0 ND<1.0 ND<1.0J- ND<1.0 ND<1.0 ND<1.0ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

125 121 137 77.9 178 177 154ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3 ND<1.3

13 12.7 12.4 7.57 14 14.9 12.97.96 8.16 8.36 5.04 9.62 9.36 97.38 6.53 7.57 3.28J 7.07 18.6 6.63

ND<2.5 ND<2.5 5.27 ND<2.5 2.79J 16.9 2.76JND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1 ND<0.1ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5

7.2 6.87 7.39 4.15J 8.41 9.39 7.68ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5 ND<2.5ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0

38.8 39.4 39 25.7 43 44.9 4032.8 33.1 35.7 24.8 40.4 78.7 37.6

N/A N/A N/A N/A N/A N/A N/A

N/A N/A N/A N/A N/A N/A N/A


TABLE 3-4Summary of Soil Gas Sample Analytical Results for VOCs by TO-15

Former Madera MGPMadera, California

Page 1 of 6

Sample IDAMB-

01312012AMB-

02012012AMB-

02022012EB-

01312012EB-

02012012EB-

02022012V-A1-V1-5-02072012

V-A1-V1-5-02072012D

V-A1-V1-15-02072012

Sample Date 1/31/2012 2/1/2012 2/2/2012 1/31/2012 2/1/2012 2/2/2012 2/7/2012 2/7/2012 2/7/2012Laboratory Job Number 1202161 1202161 1202161 1202161 1202161 1202161 1202290 1202290 1202290

Acetone ug/m3 13 10 7.4 18 12 10 ND<7.4 ND<7.4 ND<7.6JBBenzene ug/m3 ND<2.5 ND<2.4 ND<2.4 ND<2.5 ND<2.3 ND<2.3 ND<2.5 ND<2.5 ND<2.61,3-Butadiene ug/m3 ND<1.7 ND<1.7 ND<1.7 ND<1.7 ND<1.6 ND<1.6 ND<1.7 ND<1.7 ND<1.82-Butanone (MEK) ug/m3 ND<9.1 ND<9.0 ND<9.0 ND<9.3 ND<8.6 ND<8.5 ND<9.2 ND<9.2 ND<9.4Carbon Disulfide ug/m3 ND<9.6 ND<9.5 ND<9.5 ND<9.8 ND<9.1 ND<9.0 ND<9.8 ND<9.8 ND<10Chloroform (Trichloromethane) ug/m3 ND<3.8 ND<3.7 ND<3.7 ND<3.8 ND<3.6 ND<3.5 ND<3.8 ND<3.8 ND<3.9Dichlorodifluoromethane ug/m3 ND<3.8 ND<3.8 ND<3.8 ND<3.9 ND<3.6 ND<3.6 ND<3.9 ND<3.9 4.3Ethanol ug/m3 23 8.7 9.1 22 6.8 6.8 ND<5.9 ND<5.9 ND<6.0Ethylbenzene ug/m3 ND<3.4 ND<3.3 ND<3.3 ND<3.4 ND<3.2 ND<3.1 ND<3.4 ND<3.4 ND<3.54-Ethyltoluene ug/m3 ND<3.8 ND<3.7 ND<3.7 ND<3.9 ND<3.6 ND<3.5 ND<3.8 ND<3.8 ND<3.94-Methyl-2-pentanone (MIBK) ug/m3 ND<3.2 ND<3.1 ND<3.1 ND<3.2 ND<3.0 ND<2.9 ND<3.2 ND<3.2 ND<3.3n-Propylbenzene ug/m3 ND<3.8 ND<3.7 ND<3.7 ND<3.9 ND<3.6 ND<3.5 ND<3.8 ND<3.8 ND<3.9Tetrachloroethene ug/m3 ND<5.2 ND<5.2 ND<5.2 ND<5.4 ND<5.0 ND<4.9 ND<5.3 ND<5.3 26Tetrahydrofuran ug/m3 ND<2.3 ND<2.2 ND<2.2 ND<2.3 ND<2.2 ND<2.1 ND<2.3 ND<2.3 ND<2.4Toluene (Methyl benzene) ug/m3 ND<2.9 ND<2.9 ND<2.9 ND<3.0 ND<2.8 ND<2.7 ND<3.0 ND<3.0 ND<3.0Trichlorofluoromethane ug/m3 ND<4.4 ND<4.3 ND<4.3 ND<4.4 ND<4.1 ND<4.0 ND<4.4 ND<4.4 ND<4.51,2,4-Trimethylbenzene ug/m3 ND<3.8 ND<3.7 ND<3.7 ND<3.9 ND<3.6 ND<3.5 ND<3.8 ND<3.8 ND<3.91,3,5-Trimethylbenzene ug/m3 ND<3.8 ND<3.7 ND<3.7 ND<3.9 ND<3.6 ND<3.5 ND<3.8 ND<3.8 ND<3.9m,p-Xylenes ug/m3 ND<3.4 ND<3.3 ND<3.3 ND<3.4 ND<3.2 ND<3.1 ND<3.4 ND<3.4 ND<3.5o-Xylene ug/m3 ND<3.4 ND<3.3 ND<3.3 ND<3.4 ND<3.2 ND<3.1 ND<3.4 ND<3.4 ND<3.5All other VOCs are not-detected ug/m3

Helium, ASTM D-1946Helium percent N/A N/A N/A N/A N/A N/A N/A N/A N/A

Notes:1) "ND<" INDICATES CONSTITUENT(S) NOT DETECTED AT OR ABOVE LABORATORY DETECTION LIMIT.2) "ug/m3" INDICATES MICROGRAM PER CUBIC METER3) MGP = MANUFACTURED GAS PLANT4) USEPA = UNITED STATES ENVIRONMENTAL PROTECTION AGENCY5) ASTM = AMERICAN SOCIETY FOR TESTING AND MATERIALS6) N/A INDICATES THAT SAMPLE NOT ANALYZED FOR THIS METHOD.

Units

Volatile Organic Compounds (VOCs) USEPA Method TO-15



Page 2 of 6

Sample IDSample DateLaboratory Job Number

Acetone ug/m3

Benzene ug/m3

1,3-Butadiene ug/m3

2-Butanone (MEK) ug/m3

Carbon Disulfide ug/m3

Chloroform (Trichloromethane) ug/m3

Dichlorodifluoromethane ug/m3

Ethanol ug/m3

Ethylbenzene ug/m3

4-Ethyltoluene ug/m3

4-Methyl-2-pentanone (MIBK) ug/m3

n-Propylbenzene ug/m3

Tetrachloroethene ug/m3

Tetrahydrofuran ug/m3

Toluene (Methyl benzene) ug/m3

Trichlorofluoromethane ug/m3

1,2,4-Trimethylbenzene ug/m3


m,p-Xylenes ug/m3

o-Xylene ug/m3

All other VOCs are not-detected ug/m3

Helium, ASTM D-1946Helium percent

Units


V-A2-V1-5-02082012

V-A2-V1-15-02082012

V-A3-V1-5-02092012

V-A3-V1-15-02092012

V-A4-V1-5-02092012

V-A4-V1-15-02092012

V-A5-V1-5-02102012

V-A5-V1-5-02102012D

2/8/2012 2/8/2012 2/9/2012 2/9/2012 2/9/2012 2/9/2012 2/10/2012 2/10/20121202290 1202290 1202383 1202383 1202383 1202383 1202383 1202383

ND<7.4JB ND<7.4JB ND<7.1JB ND<7.8 ND<7.4 ND<7.2 ND<8.1 ND<7.8JB6.3 ND<2.5 ND<2.4 ND<2.6 ND<2.5 ND<2.4 ND<2.7 ND<2.6

ND<1.7 ND<1.7 ND<1.6 2 ND<1.7 ND<1.7 ND<1.9 ND<1.8ND<9.2 ND<9.1 ND<8.8 ND<9.7 ND<9.1 ND<9.0 ND<10 ND<9.7

12 ND<9.6 ND<9.3 ND<10 ND<9.6 ND<9.5 12 12ND<3.8 ND<3.8 ND<3.6 ND<4.0 ND<3.8 ND<3.7 20 21ND<3.9 3.9 ND<3.7 ND<4.0 ND<3.8 ND<3.8 ND<4.2 ND<4.0ND<5.9 ND<5.8 ND<5.6 ND<6.2 ND<5.8 ND<5.7 ND<6.4 ND<6.2

4.1 ND<3.4 ND<3.2 ND<3.6 ND<3.4 ND<3.3 ND<3.7 ND<3.63.9 ND<3.8 ND<3.7 ND<4.0 ND<3.8 ND<3.7 ND<4.2 ND<4.0

ND<3.2 ND<3.2 ND<3.0 ND<3.4 ND<3.2 ND<3.1 ND<3.5 ND<3.4ND<3.8 ND<3.8 ND<3.7 ND<4.0 ND<3.8 ND<3.7 ND<4.2 ND<4.0

8.8 10 ND<5.0 8.7 5.8 11 8.9 9.1ND<2.3 ND<2.3 ND<2.2 ND<2.4 ND<2.3 ND<2.2 ND<2.5 ND<2.4

21 ND<2.9 ND<2.8 ND<3.1 4.7 ND<2.9 3.3 3.7ND<4.4 ND<4.4 ND<4.2 ND<4.6 ND<4.4 ND<4.3 ND<4.8 ND<4.6

4.9 ND<3.8 ND<3.7 ND<4.0 ND<3.8 ND<3.7 ND<4.2 ND<4.0ND<3.8 ND<3.8 ND<3.7 ND<4.0 ND<3.8 ND<3.7 ND<4.2 ND<4.0

13 ND<3.4 ND<3.2 ND<3.6 ND<3.4 ND<3.3 6.1 5.25 ND<3.4 ND<3.2 ND<3.6 ND<3.4 ND<3.3 ND<3.7 ND<3.6

N/A N/A ND<0.074 N/A N/A N/A N/A N/ANotes:1) "ND<" INDICATES CONSTITUENT(S) NOT DETECTED AT OR ABOVE LABORATORY DETECTION LIMIT.2) "ug/m3" INDICATES MICROGRAM PER CUBIC METER3) MGP = MANUFACTURED GAS PLANT4) USEPA = UNITED STATES ENVIRONMENTAL PROTECTION AGENCY5) ASTM = AMERICAN SOCIETY FOR TESTING AND MATERIALS6) N/A INDICATES THAT SAMPLE NOT ANALYZED FOR THIS METHOD.



Page 3 of 6


Acetone ug/m3

Benzene ug/m3

1,3-Butadiene ug/m3





Ethanol ug/m3

Ethylbenzene ug/m3










m,p-Xylenes ug/m3

o-Xylene ug/m3



Units


V-A5-V1-15-02102012

V-B1-V1-5-02072012

V-B1-V1-15-02072012

V-B1-V2-5-02072012

V-B1-V2-15-02072012

V-B2-V1-5-02072012

V-B2-V1-15-02072012

V-B3-V1-5-02082012

2/10/2012 2/7/2012 2/7/2012 2/7/2012 2/7/2012 2/7/2012 2/7/2012 2/8/20121202383 1202290 1202290 1202290 1202290 1202290 1202290 1202383

ND<7.5 ND<8.1 ND<7.4JB ND<7.3 ND<7.4 ND<7.3 ND<7.8 ND<6.9JBND<2.5 ND<2.7 ND<2.5 ND<2.4 ND<2.5 ND<2.4 ND<2.6 3.2ND<1.7 ND<1.9 ND<1.7 ND<1.7 ND<1.7 ND<1.7 ND<1.8 ND<1.6ND<9.3 ND<10 ND<9.1 ND<9.0 ND<9.2 ND<9.0 ND<9.7 11ND<9.8 ND<10 ND<9.6 ND<9.5 ND<9.8 ND<9.5 ND<10 9.1ND<3.8 ND<4.2 ND<3.8 46 ND<3.8 4.5 ND<4.0 3.9ND<3.9 ND<4.2 ND<3.8 ND<3.8 ND<3.9 ND<3.8 4.7 ND<3.6ND<6.0 ND<6.4 ND<5.8 ND<5.8JB ND<5.9 ND<5.8 ND<6.2 ND<5.5JBND<3.4 ND<3.7 ND<3.4 ND<3.3 ND<3.4 ND<3.3 ND<3.6 8.1ND<3.9 ND<4.2 ND<3.8 ND<3.8 ND<3.8 ND<3.8 ND<4.0 12ND<3.2 ND<3.5 ND<3.2 ND<3.1 ND<3.2 ND<3.1 ND<3.4 7ND<3.9 ND<4.2 ND<3.8 ND<3.8 ND<3.8 ND<3.8 ND<4.0 ND<3.6

5.6 13 ND<5.2 ND<5.2 32 ND<5.2 30 9.4ND<2.3 ND<2.5 ND<2.3 ND<2.2 ND<2.3 ND<2.2 ND<2.4 4ND<3.0 ND<3.2 ND<2.9 ND<2.9 ND<3.0 3.2 ND<3.1 30ND<4.4 ND<4.8 ND<4.4 ND<4.3 ND<4.4 ND<4.3 7.5 ND<4.1ND<3.9 ND<4.2 3.8 5.2 ND<3.8 4 ND<4.0 18ND<3.9 ND<4.2 ND<3.8 ND<3.8 ND<3.8 ND<3.8 ND<4.0 5.2ND<3.4 ND<3.7 5.4 5.8 ND<3.4 5.3 ND<3.6 31ND<3.4 ND<3.7 ND<3.4 ND<3.3 ND<3.4 ND<3.3 ND<3.6 9.8

N/A ND<0.085 N/A N/A N/A N/A N/A N/ANotes:1) "ND<" INDICATES CONSTITUENT(S) NOT DETECTED AT OR ABOVE LABORATORY DETECTION LIMIT.2) "ug/m3" INDICATES MICROGRAM PER CUBIC METER3) MGP = MANUFACTURED GAS PLANT4) USEPA = UNITED STATES ENVIRONMENTAL PROTECTION AGENCY5) ASTM = AMERICAN SOCIETY FOR TESTING AND MATERIALS6) N/A INDICATES THAT SAMPLE NOT ANALYZED FOR THIS METHOD.



Page 4 of 6


Acetone ug/m3

Benzene ug/m3

1,3-Butadiene ug/m3





Ethanol ug/m3

Ethylbenzene ug/m3










m,p-Xylenes ug/m3

o-Xylene ug/m3



Units


V-B3-V1-15-02082012

V-B4-V1-5-02102012

V-B4-V1-5-02102012D

V-B4-V1-15-02102012

V-B5-V1-5-02092012

V-B5-V1-15-02092012

V-C1-V1-5-02082012

V-C1-V1-1502082012

2/8/2012 2/10/2012 2/10/2012 2/10/2012 2/9/2012 2/9/2012 2/8/2012 2/8/20121202383 1202383 1202383 1202383 1202383 1202383 1202290 1202383

ND<7.1 ND<7.8 ND<7.6 ND<17 ND<7.5 ND<7.4 ND<7.8JB ND<7.5JBND<2.4 ND<2.6 ND<2.6 ND<5.8 ND<2.5 ND<2.5 ND<2.6 ND<2.5ND<1.6 ND<1.8 ND<1.8 ND<4.0 ND<1.7 ND<1.7 ND<1.8 ND<1.7ND<8.8 ND<9.7 ND<9.5 ND<22 ND<9.3 ND<9.1 ND<9.7 ND<9.3ND<9.3 ND<10 ND<10 ND<23 ND<9.8 11 15 ND<9.8ND<3.6 ND<4.0 ND<3.9 ND<8.9 5.6 ND<3.8 75 ND<3.8

4.9 ND<4.0 ND<4.0 ND<9.0 ND<3.9 4.2 ND<4.1 4.1ND<5.6 ND<6.2 ND<6.1 ND<14JB ND<6.0 ND<5.8 ND<6.2 ND<6.0JBND<3.2 ND<3.6 ND<3.5 ND<7.9 ND<3.4 ND<3.4 11 ND<3.4ND<3.7 ND<4.0 ND<4.0 ND<9.0 ND<3.9 5.9 19 ND<3.9ND<3.0 ND<3.4 ND<3.3 ND<7.5 ND<3.2 ND<3.2 ND<3.4 ND<3.2ND<3.7 ND<4.0 ND<4.0 ND<9.0 ND<3.9 ND<3.8 ND<4.0 ND<3.9

38 8.1 7.5 38 ND<5.4 6.7 12 14ND<2.2 ND<2.4 ND<2.4 ND<5.4 ND<2.3 ND<2.3 ND<2.4 ND<2.3ND<2.8 ND<3.1 ND<3.0 ND<6.9 5.7 5.7 28 ND<3.0

5 ND<4.6 ND<4.5 ND<10 ND<4.4 ND<4.4 ND<4.6 ND<4.4ND<3.7 ND<4.0 4.2 ND<9.0 4.1 10 26 ND<3.9ND<3.7 ND<4.0 ND<4.0 ND<9.0 ND<3.9 ND<3.8 9.1 ND<3.9ND<3.2 4 3.8 ND<7.9 7.4 12 46 ND<3.4ND<3.2 ND<3.6 ND<3.5 ND<7.9 ND<3.4 5.4 15 ND<3.4

N/A N/A N/A N/A N/A N/A N/A N/ANotes:1) "ND<" INDICATES CONSTITUENT(S) NOT DETECTED AT OR ABOVE LABORATORY DETECTION LIMIT.2) "ug/m3" INDICATES MICROGRAM PER CUBIC METER3) MGP = MANUFACTURED GAS PLANT4) USEPA = UNITED STATES ENVIRONMENTAL PROTECTION AGENCY5) ASTM = AMERICAN SOCIETY FOR TESTING AND MATERIALS6) N/A INDICATES THAT SAMPLE NOT ANALYZED FOR THIS METHOD.



Page 5 of 6


Acetone ug/m3

Benzene ug/m3

1,3-Butadiene ug/m3





Ethanol ug/m3

Ethylbenzene ug/m3










m,p-Xylenes ug/m3

o-Xylene ug/m3



Units


V-C1-V2-5-02062012

V-C1-V2-15-02062012

V-C1-V3-5-02062012

V-C1-V3-15-02062012

V-C1-V4-5-02062012

V-C1-V4-15-02062012

V-C1-V4-15-02062012D

V-C1-V5-5-02062012

2/6/2012 2/6/2012 2/6/2012 2/6/2012 2/6/2012 2/6/2012 2/6/2012 2/6/20121202290 1202290 1202290 1202290 1202290 1202290 1202290 1202290

ND<7.2JB ND<7.5JB ND<7.6 ND<7.5JB ND<7.6 ND<7.6 ND<7.5 ND<7.5ND<2.4 ND<2.5 ND<2.6 3.3 ND<2.6 ND<2.6 ND<2.5 ND<2.5ND<1.7 ND<1.7 ND<1.8 ND<1.7 ND<1.8 ND<1.8 ND<1.7 ND<1.7ND<9.0 ND<9.3 ND<9.5 ND<9.3 ND<9.4 ND<9.5 ND<9.3 ND<9.3ND<9.5 ND<9.8 ND<10 ND<9.8 ND<10 ND<10 ND<9.8 ND<9.8

5.2 ND<3.8 63 ND<3.8 65 ND<3.9 ND<3.8 ND<3.8ND<3.8 4.5 ND<4.0 4.7 ND<4.0 4 4.2 4ND<5.7 ND<6.0 ND<6.1 ND<6.0 ND<6.0 ND<6.1 ND<6.0 ND<6.0JBND<3.3 ND<3.4 ND<3.5 ND<3.4 ND<3.5 ND<3.5 ND<3.4 ND<3.4ND<3.7 ND<3.9 ND<4.0 ND<3.9 ND<3.9 ND<4.0 ND<3.9 ND<3.9ND<3.1 ND<3.2 ND<3.3 ND<3.2 ND<3.3 ND<3.3 ND<3.2 ND<3.2ND<3.7 ND<3.9 ND<4.0 ND<3.9 ND<3.9 ND<4.0 ND<3.9 ND<3.9ND<5.2 8.6 ND<5.5 32 6.1 43 48 8.7ND<2.2 ND<2.3 ND<2.4 ND<2.3 ND<2.4 ND<2.4 ND<2.3 ND<2.3ND<2.9 ND<3.0 ND<3.0 3.9 ND<3.0 ND<3.0 ND<3.0 ND<3.0ND<4.3 ND<4.4 ND<4.5 ND<4.4 ND<4.5 ND<4.5 ND<4.4 ND<4.4ND<3.7 ND<3.9 ND<4.0 ND<3.9 ND<3.9 ND<4.0 ND<3.9 ND<3.9ND<3.7 ND<3.9 ND<4.0 ND<3.9 ND<3.9 ND<4.0 ND<3.9 ND<3.9ND<3.3 ND<3.4 ND<3.5 ND<3.4 ND<3.5 ND<3.5 ND<3.4 ND<3.4ND<3.3 ND<3.4 ND<3.5 ND<3.4 ND<3.5 ND<3.5 ND<3.4 ND<3.4

N/A N/A N/A N/A N/A N/A N/A N/ANotes:1) "ND<" INDICATES CONSTITUENT(S) NOT DETECTED AT OR ABOVE LABORATORY DETECTION LIMIT.2) "ug/m3" INDICATES MICROGRAM PER CUBIC METER3) MGP = MANUFACTURED GAS PLANT4) USEPA = UNITED STATES ENVIRONMENTAL PROTECTION AGENCY5) ASTM = AMERICAN SOCIETY FOR TESTING AND MATERIALS6) N/A INDICATES THAT SAMPLE NOT ANALYZED FOR THIS METHOD.



Page 6 of 6


Acetone ug/m3

Benzene ug/m3

1,3-Butadiene ug/m3





Ethanol ug/m3

Ethylbenzene ug/m3










m,p-Xylenes ug/m3

o-Xylene ug/m3



Units


V-C1-V5-15-02062012

V-C2-V1-5-02082012

V-C2-V1-15-02082012

V-C3-V1-5-02082012

V-C3-V1-15-02082012

V-C4-V1-5-02092012

V-C4-V1-15-02092012

V-C5-V1-5-02092012

2/6/2012 2/8/2012 2/8/2012 2/8/2012 2/8/2012 2/9/2012 2/9/2012 2/9/20121202290 1202290 1202383 1202290 1202290 1202383 1202383 1202383

ND<7.4 ND<7.2 ND<7.5 ND<7.5JB ND<7.4 ND<7.8JB ND<7.5 ND<7.6JBND<2.5 ND<2.4 ND<2.5 4.1 ND<2.5 3.3 ND<2.5 ND<2.6ND<1.7 ND<1.7 ND<1.7 ND<1.7 ND<1.7 ND<1.8 ND<1.7 ND<1.8ND<9.1 ND<8.9 ND<9.3 ND<9.3 ND<9.1 ND<9.7 ND<9.3 ND<9.5ND<9.6 ND<9.4 ND<9.8 11 ND<9.6 ND<10 ND<9.8 ND<10ND<3.8 ND<3.7 ND<3.8 12 ND<3.8 ND<4.0 ND<3.8 ND<3.9

5.4 ND<3.7 4.2 ND<3.9 4.7 ND<4.0 3.9 ND<4.0ND<5.8 ND<5.7 ND<6.0 ND<6.0 ND<5.8 ND<6.2 ND<6.0 ND<6.1ND<3.4 4.9 ND<3.4 12 ND<3.4 ND<3.6 ND<3.4 ND<3.5ND<3.8 8.2 ND<3.9 21 ND<3.8 ND<4.0 ND<3.9 ND<4.0ND<3.2 ND<3.1 ND<3.2 ND<3.2 ND<3.2 ND<3.4 ND<3.2 ND<3.3ND<3.8 ND<3.7 ND<3.9 4.4 ND<3.8 ND<4.0 ND<3.9 ND<4.0

53 7.4 37 14 39 8.3 21 5.6ND<2.3 ND<2.2 ND<2.3 ND<2.3 ND<2.3 ND<2.4 ND<2.3 ND<2.4ND<2.9 11 ND<3.0 31 ND<2.9 8.7 ND<3.0 ND<3.0ND<4.4 ND<4.2 ND<4.4 ND<4.4 ND<4.4 ND<4.6 ND<4.4 ND<4.5ND<3.8 10 ND<3.9 28 ND<3.8 ND<4.0 ND<3.9 ND<4.0ND<3.8 ND<3.7 ND<3.9 11 ND<3.8 ND<4.0 ND<3.9 ND<4.0ND<3.4 21 ND<3.4 50 ND<3.4 3.6 ND<3.4 ND<3.5ND<3.4 6.9 ND<3.4 17 ND<3.4 ND<3.6 ND<3.4 ND<3.5

ND<0.078 ND<0.076 N/A N/A N/A N/A N/A N/ANotes:1) "ND<" INDICATES CONSTITUENT(S) NOT DETECTED AT OR ABOVE LABORATORY DETECTION LIMIT.2) "ug/m3" INDICATES MICROGRAM PER CUBIC METER3) MGP = MANUFACTURED GAS PLANT4) USEPA = UNITED STATES ENVIRONMENTAL PROTECTION AGENCY5) ASTM = AMERICAN SOCIETY FOR TESTING AND MATERIALS6) N/A INDICATES THAT SAMPLE NOT ANALYZED FOR THIS METHOD.

Detection Frequency

(Detections/ Samples

Analyzed)

Range of Detected

Concentrations a

(mg/kg)

Arithmetic Mean

(mg/kg)

95% UCL of Concentrations b

(mg/kg)

Site-Specific Background

Detection Frequency

(Detections/ Samples Analyzed)

Range of Site-Specific Background

Concentrations a

(mg/kg)

95% UCL of Site-Specific Background

Concentrations b

(mg/kg)

Included in Risk

Assessment c

Volatile Organic Compounds1,1,1,2-Tetrachloroethane 0 / 25 ND NC NC -- -- -- No1,1,1-Trichloroethane 0 / 25 ND NC NC -- -- -- No1,1,2,2-Tetrachloroethane 0 / 25 ND NC NC -- -- -- No1,1,2-Trichloroethane 0 / 25 ND NC NC -- -- -- No1,1-Dichloroethane 0 / 25 ND NC NC -- -- -- No1,1-Dichloroethene 0 / 25 ND NC NC -- -- -- No1,1-Dichloropropene 0 / 25 ND NC NC -- -- -- No1,2,3-Trichlorobenzene 0 / 25 ND NC NC -- -- -- No1,2,3-Trichloropropane 0 / 25 ND NC NC -- -- -- No1,2,4-Trichlorobenzene 0 / 25 ND NC NC -- -- -- No1,2,4-Trimethylbenzene 0 / 25 ND NC NC -- -- -- No1,2-Dibromo-3-chloropropane (DBCP) 0 / 25 ND NC NC -- -- -- No1,2-Dibromoethane (EDB) 0 / 25 ND NC NC -- -- -- No1,2-Dichlorobenzene 0 / 27 ND NC NC -- -- -- No1,2-Dichloroethane (EDC) 0 / 25 ND NC NC -- -- -- No1,2-Dichloropropane 0 / 25 ND NC NC -- -- -- No1,3,5-Trimethylbenzene 0 / 25 ND NC NC -- -- -- No1,3-Dichlorobenzene 0 / 27 ND NC NC -- -- -- No1,3-Dichloropropane 0 / 25 ND NC NC -- -- -- No1,4-Dichlorobenzene 0 / 27 ND NC NC -- -- -- No2,2-Dichloropropane 0 / 25 ND NC NC -- -- -- No2-Butanone (MEK) 0 / 25 ND NC NC -- -- -- No2-Chloroethyl vinyl ether 0 / 25 ND NC NC -- -- -- No2-Chlorotoluene 0 / 25 ND NC NC -- -- -- No2-Hexanone 0 / 25 ND NC NC -- -- -- No4-Chlorotoluene 0 / 25 ND NC NC -- -- -- No4-Methyl-2-pentanone (MIBK) 0 / 25 ND NC NC -- -- -- NoAcetone 0 / 25 ND NC NC -- -- -- NoBenzene 2 / 27 0.0020 - 0.0044 0.00092 NC -- -- -- YesBromobenzene (Phenyl bromide) 0 / 25 ND NC NC -- -- -- NoBromochloromethane 0 / 25 ND NC NC -- -- -- No

Chemical

TABLE 4-1SUMMARY OF CHEMICALS INCLUDED IN THE RISK ASSESSMENT: ONSITE SOIL (0-10 FEET BGS)

Former Madera Manufactured Gas PlantMadera, California

Madera_Closure_HRA_Tables Page 1 of 4 IRIS ENVIRONMENTAL

Detection Frequency


Analyzed)

Range of Detected

Concentrations a

(mg/kg)

Arithmetic Mean

(mg/kg)


(mg/kg)


Detection Frequency



Concentrations a

(mg/kg)


Concentrations b

(mg/kg)

Included in Risk

Assessment cChemical



Bromodichloromethane 0 / 25 ND NC NC -- -- -- NoBromoform (Tribromomethane) 0 / 25 ND NC NC -- -- -- NoBromomethane (Methyl bromide) 0 / 25 ND NC NC -- -- -- NoCarbon Disulfide 0 / 25 ND NC NC -- -- -- NoCarbon tetrachloride 0 / 25 ND NC NC -- -- -- NoChlorobenzene 0 / 27 ND NC NC -- -- -- NoChloroethane 0 / 25 ND NC NC -- -- -- NoChloroform (Trichloromethane) 0 / 25 ND NC NC -- -- -- NoChloromethane (Methyl chloride) 0 / 25 ND NC NC -- -- -- Nocis-1,2-Dichloroethene 0 / 25 ND NC NC -- -- -- Nocis-1,3-Dichloropropene 0 / 25 ND NC NC -- -- -- NoDibromochloromethane 0 / 25 ND NC NC -- -- -- NoDibromomethane 0 / 25 ND NC NC -- -- -- NoDichlorodifluoromethane 0 / 25 ND NC NC -- -- -- NoEthylbenzene 0 / 27 ND NC NC -- -- -- NoHexachlorobutadiene 0 / 25 ND NC NC -- -- -- NoIodomethane 0 / 13 ND NC NC -- -- -- NoIsopropylbenzene 0 / 25 ND NC NC -- -- -- Nom,p-Xylenes 0 / 25 ND NC NC -- -- -- NoMethylene chloride (DCM) 0 / 25 ND NC NC -- -- -- NoMethyl-tert-butyl ether (MTBE) 0 / 25 ND NC NC -- -- -- NoNaphthalene 1 / 25 0.015 0.0030 NC -- -- -- Yesn-Butylbenzene 0 / 25 ND NC NC -- -- -- Non-Propylbenzene 0 / 25 ND NC NC -- -- -- Nop-Isopropyltoluene 0 / 25 ND NC NC -- -- -- Nosec-Butylbenzene 0 / 25 ND NC NC -- -- -- NoStyrene 0 / 25 ND NC NC -- -- -- Notert-Butylbenzene 0 / 25 ND NC NC -- -- -- NoTetrachloroethene 0 / 25 ND NC NC -- -- -- NoToluene (Methyl benzene) 0 / 27 ND NC NC -- -- -- Notrans-1,2-Dichloroethene 0 / 25 ND NC NC -- -- -- Notrans-1,3-Dichloropropene 0 / 25 ND NC NC -- -- -- NoTrichloroethene 0 / 25 ND NC NC -- -- -- NoTrichlorofluoromethane 0 / 25 ND NC NC -- -- -- NoVinyl Acetate 0 / 25 ND NC NC -- -- -- NoVinyl chloride (Chloroethene) 0 / 25 ND NC NC -- -- -- NoXylenes, Total 0 / 27 ND NC NC -- -- -- No


Detection Frequency


Analyzed)

Range of Detected

Concentrations a

(mg/kg)

Arithmetic Mean

(mg/kg)


(mg/kg)


Detection Frequency



Concentrations a

(mg/kg)


Concentrations b

(mg/kg)

Included in Risk




Total Petroleum HydrocarbonsTPH as Diesel (C13-C22) 1 / 44 652 16 NC -- -- -- YesTPH as Gasoline 0 / 2 ND NC NC -- -- -- NoTPH as Gasoline and Light HC. (C4-C12) 0 / 42 ND NC NC -- -- -- NoTPH as Heavy Hydrocarbons (C23-C40) 1 / 42 3,800 92 NC -- -- -- YesTPH as Oil 0 / 2 ND NC NC -- -- -- NoTPH Total as Diesel and Heavy HC.C13-C40 1 / 42 4,450 107 NC -- -- -- YesPolycylic Aromatic HydrocarbonsAcenaphthene 1 / 120 0.022 0.0064 NC -- -- -- YesAcenaphthylene 3 / 120 0.017 - 0.086 0.0073 NC -- -- -- YesAnthracene 0 / 120 ND NC NC -- -- -- NoBenzo(a)anthracene 10 / 120 0.016 - 0.27 0.0098 0.023 -- -- -- YesBenzo(a)pyrene 24 / 120 0.011 - 0.17 0.017 0.027 -- -- -- YesBenzo(b)fluoranthene 20 / 120 0.010 - 0.63 0.017 0.036 -- -- -- YesBenzo(g,h,i)perylene 20 / 120 0.013 - 0.57 0.024 0.041 -- -- -- YesBenzo(k)fluoranthene 13 / 120 0.012 - 0.061 0.0080 0.020 -- -- -- YesChrysene 19 / 120 0.010 - 0.21 0.011 0.019 -- -- -- YesDibenzo(a,h)anthracene 0 / 120 ND NC NC -- -- -- NoFluoranthene 27 / 120 0.011 - 0.32 0.023 0.035 -- -- -- YesFluorene 0 / 120 ND NC NC -- -- -- NoIndeno(1,2,3-cd)pyrene 19 / 120 0.011 - 0.22 0.016 0.026 -- -- -- YesNaphthalene 4 / 120 0.012 - 0.49 0.012 NC -- -- -- YesPhenanthrene 17 / 120 0.010 - 0.15 0.013 0.023 -- -- -- YesPyrene 30 / 120 0.011 - 0.40 0.031 0.045 -- -- -- Yes

Benzo(a)pyrene Equivalents 120 / 120 0.0012 - 0.22 0.024 0.040 73 / 86 0.0027 - 2.8 0.40 YesMetalsAntimony 0 / 92 ND NC NC 0/8 ND ND NoArsenic 13 / 105 3.0 - 14 1.5 5.8 6/8 1.25 - 3.3 2.4 YesBarium 92 / 92 34 - 191 119 126 8/8 80.5 - 160 144 YesBeryllium 0 / 92 ND NC NC 0/8 ND ND NoCadmium 0 / 92 ND NC NC 0/8 ND ND NoChromium 92 / 92 3.1 - 26 12 12 8/8 6.35 - 14.7 13.3 YesCobalt 90 / 92 3.1 - 13 7.2 7.6 8/8 4.05 - 8.75 7.8 YesCopper 88 / 92 2.6 - 58 7.8 9.0 8/8 4.8 - 11.6 9.9 Yes

Carcinogenic Polycyclic Aromatic Hydrocarbons

e

f

e

e

e

e

e

e

g

d

i

h

d

d


Detection Frequency


Analyzed)

Range of Detected

Concentrations a

(mg/kg)

Arithmetic Mean

(mg/kg)


(mg/kg)


Detection Frequency



Concentrations a

(mg/kg)


Concentrations b

(mg/kg)

Included in Risk




Lead 41 / 92 2.5 - 67 3.2 5.3 1/8 2.6 NC YesMercury inorganic 0 /92 ND NC NC 0/8 ND ND NoMolybdenum 0 / 92 ND NC NC 2/8 3.05 - 3.4 NC NoNickel 91 / 92 2.6 - 16 7.0 7.4 8/8 4.05 - 8 7.26 YesSelenium 1 / 92 1.1 0.53 NC 0/8 ND ND YesSilver 0 / 92 ND NC NC 0/8 ND ND NoThallium 0 / 92 ND NC NC 0/8 ND ND NoVanadium 92 / 92 14 - 54 35 37 8/8 18.5 - 43 40 YesZinc 92 / 92 11 - 245 35 40 8/8 23.4 - 43 39 YesCyanidesCyanide (Total) 0 / 7 ND NC NC -- -- -- NoNotes:

a

b

c

d

e

f

g

h

i

Sources:

United States Environmental Protection Agency (USEPA). 2010. ProUCL Version 4.1 User Guide (Draft). EPA/600/R-07/041. May.

TPH evaluated using detected individual related constituents.Carcinogenic polycyclic aromatic hydrocarbons (CPAH). Benzo(a)pyrene equivalent concentration for CPAH was calculated using the Potency Equivalency Factors, as recommended by Cal/EPA (1994).

California Environmental Protection Agency (Cal/EPA). 1994. Preliminary Endangerment Assessment Guidance Manual. Department of Toxic Substances Control (DTSC). January.

As set forth in the Remedial Action Workplan (RAW), remedial activities were focused on reducing the concentrations of CPAHs and arsenic in Site soil to ambient concentrations such that potential future residents at the Site (in a residential scenario) will have no more exposure to CPAHs than they would have had in the absence of the former MGP operations and should be effective in restoring the Site to a condition that is protective of all future land uses. As such, CPAHs are included in the post-remediation human health risk assessment.

Represents the 95% UCL of the background CPAH data set for Northern California used for risk management purposes.

As stated in the RAW, the post-remediation health risk assessment will be performed to demonstrate that the remedial goal (i.e., reduce Site arsenic concentrations to ambient levels) is achieved such that the 95% UCL of arsenic concentrations across the Site is less than 6 mg/kg.

mg/kg = milligrams per kilogram.NC = Not calculated. In order for ProUCL 4.1 to reliably evaluate a specific data population (e.g., dataset of concentrations of a particular chemical measured at the site), the population must

include at least eight results including at least five detections and four distinct values.ND = Not detected. -- = Not analyzed for.

The range of concentrations collected at the Site during remedial investigations in 2007 and 2008 by EarthTech; post-remediation confirmation sampling in 2011 was conducted by AECOM. For inorganics, the background dataset includes 8 samples collected in Septmeber 2008 by EarthTech.Corresponds to the 95% Upper Confidence Limit (UCL) of the mean calculated using USEPA (2010) ProUCL Statistical Program. Inorganics were included in the risk assessment if the maximum detected concentration or the 95% UCL is above maximum detected concentration or the 95% UCL in the background data set, respectively. If the 95% UCL is greater than the maximum detected concentration, the maximum detected concentration is used for screening purposes in both the Site and background datasets. Naphthalene was analyzed as a PAH, as the max concentration was higher as a PAH. All other chemicals (e.g., organics) were included in the risk assessment if they were ever detected in soil. Per Cal/EPA PEA guidance, lead is included regardless of background levels.


Detection Frequency

(Detections/Samples

Analyzed)

Range of Detected Concentrations a

(µg/m3)

Included in Risk

Assessment b

Volatile Organic Compounds1,1,1-Trichloroethane 0 / 43 ND No1,1,2,2-Tetrachloroethane 0 / 43 ND No1,1,2-Trichloroethane 0 / 43 ND No1,1-Dichloroethane 0 / 43 ND No1,1-Dichloroethene 0 / 43 ND No1,2,4-Trichlorobenzene 0 / 43 ND No1,2,4-Trimethylbenzene 11 / 43 4 - 28 Yes1,2-Dibromoethane (EDB) 0 / 43 ND No1,2-Dichlorobenzene 0 / 43 ND No1,2-Dichloroethane 0 / 43 ND No1,2-Dichloropropane 0 / 43 ND No1,3,5-Trimethylbenzene 3 / 43 5 - 11 Yes1,3-Butadiene 1 / 43 2 Yes1,3-Dichlorobenzene 0 / 43 ND No1,4-Dichlorobenzene 0 / 43 ND No1,4-Dioxane 0 / 43 ND No2,2,4-Trimethylpentane 0 / 43 ND No2-Butanone (Methyl Ethyl Ketone) 1 / 43 11 Yes2-Hexanone 0 / 43 ND No2-Propanol 0 / 43 ND No3-Chloropropene 0 / 43 ND No4-Ethyltoluene 6 / 43 4 - 21 Yes4-Methyl-2-pentanone 1 / 43 7 YesAcetone 0 / 43 ND Noalpha-Chlorotoluene 0 / 43 ND NoBenzene 5 / 43 3 - 6 YesBromodichloromethane 0 / 43 ND NoBromoform 0 / 43 ND NoBromomethane 0 / 43 ND NoCarbon Disulfide 7 / 43 9 - 15 YesCarbon Tetrachloride 0 / 43 ND NoChlorobenzene 0 / 43 ND NoChloroethane 0 / 43 ND NoChloroform 11 / 43 4 - 75 YesChloromethane 0 / 43 ND Nocis-1,2-Dichloroethene 0 / 43 ND Nocis-1,3-Dichloropropene 0 / 43 ND NoCumene 0 / 43 ND NoCyclohexane 0 / 43 ND NoDibromochloromethane 0 / 43 ND NoEthanol 0 / 43 ND NoEthyl Benzene 5 / 43 4 - 12 Yes

TABLE 4-2SUMMARY OF CHEMICALS INCLUDED IN THE RISK ASSESSMENT: SOIL GAS


Soil Gas

Chemical

ra_Closure_HRA_Tables Page 1 of 2 IRIS ENVIRONMENTAL

Detection Frequency

(Detections/Samples

Analyzed)

Range of Detected Concentrations a

(µg/m3)

Included in Risk

Assessment b

TABLE 4-2SUMMARY OF CHEMICALS INCLUDED IN THE RISK ASSESSMENT: SOIL GAS


Soil Gas

ChemicalFreon 11 2 / 43 5 - 8 YesFreon 113 0 / 43 ND NoFreon 114 0 / 43 ND NoFreon 12 15 / 43 4 - 5 YesHeptane 0 / 43 ND NoHexachlorobutadiene 0 / 43 ND NoHexane 0 / 43 ND Nom,p-Xylene 15 / 43 4 - 50 YesMethyl tert-butyl ether 0 / 43 ND NoMethylene Chloride 0 / 43 ND NoNaphthalene 0 / 43 ND Noo-Xylene 6 / 43 5 - 17 YesPropylbenzene 1 / 43 4 YesStyrene 0 / 43 ND NoTetrachloroethene 34 / 43 6 - 53 YesTetrahydrofuran 1 / 43 4 YesToluene 13 / 43 3 - 31 Yestrans-1,2-Dichloroethene 0 / 43 ND Notrans-1,3-Dichloropropene 0 / 43 ND NoTrichloroethene 0 / 43 ND NoVinyl Chloride 0 / 43 ND No

Notes:

a

b All detected volatile organic compounds (VOCs) in soil gas were included in the risk assessment.

µg/m3 = micrograms per meter cubed. ND = Not detected.

The range of soil gas concentrations collected during post-remedial confirmation sampling conducted by AECOM.

ra_Closure_HRA_Tables Page 2 of 2 IRIS ENVIRONMENTAL

Onsite Resident

Child

Onsite Resident

Adult

Onsite Resident, Age-Adjusted Adult

Inhalation of Soil Particulates Particulate Emission Factor a PEF 1.2E+09 1.2E+09 1.2E+09 m3/kg

Dermal Contact with Soil Surface Area b SA 2,900 5,700 5,700 cm2/day Adherence Factor c AF 0.2 0.07 0.07 mg/cm2

Absorption Factor-PAHs d ABS-PAH 0.15 0.15 0.15 unitless Absorption Factor-Metals d ABS-Met 0.01 0.01 0.01 unitless Absorption Factor-Arsenic d ABS-As 0.03 0.03 0.03 unitless Absorption Factor-Cadmium d ABS-Cd 0.001 0.001 0.001 unitless Absorption Factor-Organics d ABS-Org 0.1 0.1 0.1 unitless Conversion Factor CF 1.0E-06 1.0E-06 1.0E-06 kg/mg

Ingestion of Soil Ingestion Rate e IR 200 100 100 mg/day Conversion Factor CF 1.0E-06 1.0E-06 1.0E-06 kg/mg

Population-Specific Intake Parameters Exposure Frequency f EF 350 350 350 days/yr Exposure Duration ED 6 30 24 yr Body Weight BW 15 70 70 kg Averaging Time-Carcinogens ATc 25,550 25,550 25,550 days Averaging Time-Noncarcinogens ATnc 2,190 10,950 NA days

Notes:a

b

c

d

e

f

g

Sources:

TABLE 4-3EXPOSURE PARAMETERS


Future Populations

U.S. Environmental Protection Agency (USEPA). 2002. Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. Office of Soild Waste and Emergency Response. Washington, DC, December.

Exposure Parameter

Corresponds to the area of exposed skin in each respective population (Cal/EPA 2011).

Symbol Units

The particulate emission factor (PEF) is calculated using the equations found in the Soil Screening Guidance (USEPA 2002), with input parameters as found in Appendix N of this post remediation HRA.

California Environmental Protection Agency (Cal/EPA). 1994. Preliminary Endangerment Assessment Guidance Manual. Department of Toxic Substances Control (DTSC). January. California Environmental Protection Agency (Cal/EPA). 2011. DTSC/HERO Human Health Risk Assessment (HHRA) Note Number 1. Department of Toxic Substances Control (DTSC). May 20.

Soil adherence factors recommended by Cal/EPA (2011) for respective populations. Dermal absorption factors for specific compound classes from Cal/EPA (1994).Ingestion rates recommended by Cal/EPA (2011) for residential populations. For the residents, corresponds to 7 days/week for 50 weeks/year. Per Cal/EPA guidance, cancer risks for future onsite residents are calculated using an age-adjusted approach to account for the higher exposures per body weight that occur during the childhood years. Accordingly, for carcinogenic effects, the evaluation assumes that the resident is a child for the first 6 years of exposure and an adult for the remaining 24 years. For noncarcinogenic hazards, the averaging time for the adult resident is 30 years.

g gg

Madera_Closure_HRA_Tables 1 of 1 IRIS ENVIRONMENTAL

Exposure Concentration: Vapor Inhalation

Noncancer

Cancer

where Ca = Csg x AC for soil gas to indoor air pathway where Ca = Csg x TF for soil gas to outdoor air pathway

Exposure Concentration: Soil Particulate Inhalation

Noncancer

Cancer

Chronic Daily Intake: Soil Dermal Contact

Noncancer

Cancer

TABLE 4-4EQUATIONS USED TO CALCULATE EXPOSURE CONCENTRATIONS AND CHRONIC DAILY INTAKES:

RESIDENTIAL SCENARIOFormer Madera Manufactured Gas Plant

Madera, California

ATnc, adult

ECinhv, c =Ca x EF x EDadult

ATc

ECinhv, nc =Ca x EF x EDadult

CDIderm, age adjusted, c =Cs x SAchild x AFchild x ABS x EF x EDchild x CF

BWchild x ATc

Cs x SAadult x AFadult x ABS x EF x EDadult, age adjusted x CF

BWadult x ATc

Cs x SAadult x AFadult x ABS x EF x EDadult x CF

BWadult x ATnc, adult

Cs x SAchild x AFchild x ABS x EF x EDchild x CF

BWchild x ATnc, childCDIderm, adult =

ECinhp, nc =Cs x (1/PEF) x EF x EDadult

CDIderm, child, nc =

ATnc, adult

ECinhp, c =Cs x (1/PEF) x EF x EDadult

ATc


TABLE 4-4EQUATIONS USED TO CALCULATE EXPOSURE CONCENTRATIONS AND CHRONIC DAILY INTAKES:


Madera, California

Chronic Daily Intake: Soil Ingestion

Noncancer

Cancer

BWadult x ATc

Where:ABS = Absorption Factor [Unitless]AC = Soil Gas-to-Indoor Air Attenuation Coefficient [Unitless]AF = Soil to Skin Adherence Factor [mg/cm2]ATc = Averaging Time for Carcinogenic Compounds [days]ATnc = Averaging Time for Noncarcinogenic Compounds [days]BW = Body Weight [kg]Ca = Concentration of Chemical in Air [mg/m3]Cs = Concentration of Chemical in Soil [mg/kg]Csg = Concentration of Chemical in Soil Gas [mg/m3]

CDIderm = Chronic Daily Intake: Dermal Contact [mgchemical/kgbody weight-day]CDIing = Chronic Daily Intake: Ingestion [mgchemical/kgbody weight-day]

CF = Conversion Factor [kg/mg]ECinhp = Exposure Concentration: Soil Particulate Inhalation [mgchemical/m

3air]

ECinhv = Exposure Concentration: Vapor Inhalation [mgchemical/m3air]

ED = Exposure Duration [years]EF = Exposure Frequency [days/year]IR = Soil Ingestion Rate [mg/day]

PEF = Soil-to-Air Particulate Emission Factor [m3/kg]SA = Surface Area of Exposed Skin [cm2/day]TF = Soil Gas-to-Air Transfer Factor [mg/m3]/[mg/m3]

CDIing, age adjusted, c =

Cs x IRadult x CF x EF x EDadultCDIing, child, nc =

Cs x IRchild x CF x EF x EDchildCDIing, adult =

Cs x IRadult x CF x EF x EDadult, age adjusted

BWchild x ATnc, child BWadult x ATnc, adult

Cs x IRchild x CF x EF x EDchild

BWchild x ATc


Future Onsite Resident

ExposurePoint

Concentrationfor Soil

Particulate Emissions

Factor (PEF)

OutdoorAirborne

Particulate Concentration

(mg/kg) a (m3/kg) (mg/m3) b

Volatile Organic CompoundsBenzene 4.4E-03 1.2E+09 3.6E-12Polycylic Aromatic HydrocarbonsAcenaphthene 2.2E-02 1.2E+09 1.8E-11Acenaphthylene 8.6E-02 1.2E+09 7.1E-11Benzo(a)anthracene 2.3E-02 1.2E+09 1.9E-11Benzo(a)pyrene 2.7E-02 1.2E+09 2.2E-11Benzo(b)fluoranthene 3.6E-02 1.2E+09 3.0E-11Benzo(g,h,i)perylene 4.1E-02 1.2E+09 3.3E-11Benzo(k)fluoranthene 2.0E-02 1.2E+09 1.7E-11Chrysene 1.9E-02 1.2E+09 1.5E-11Fluoranthene 3.5E-02 1.2E+09 2.9E-11Indeno(1,2,3-c,d)pyrene 2.6E-02 1.2E+09 2.1E-11Naphthalene 4.9E-01 1.2E+09 4.1E-10Phenanthrene 2.3E-02 1.2E+09 1.9E-11Pyrene 4.5E-02 1.2E+09 3.7E-11MetalsBarium 1.3E+02 1.2E+09 1.0E-07Chromium 1.2E+01 1.2E+09 1.0E-08Cobalt 7.6E+00 1.2E+09 6.3E-09Copper 9.0E+00 1.2E+09 7.4E-09Lead 5.3E+00 1.2E+09 4.4E-09Nickel 7.4E+00 1.2E+09 6.1E-09Selenium 1.1E+00 1.2E+09 9.1E-10Vanadium 3.7E+01 1.2E+09 3.0E-08Zinc 4.0E+01 1.2E+09 3.3E-08

Notes:a

b Outdoor air particulate concentration is calculated by dividing the soil EPC by the PEF.

TABLE 4-5EXPOSURE POINT AND PREDICTED OUTDOOR AIR CONCENTRATIONS FOR CHEMICALS OF POTENTIAL CONCERN IN ONSITE SOIL: FUTURE ONSITE


Madera, California

Chemical

The exposure point concentrations (EPCs) for onsite soil (0-10 feet bgs) dataset are used for the evaluation of direct contact exposure pathways (i.e., ingestion and dermal contact) and inhalation of outdoor air particulates. Unless otherwise indicated, the 95% upper confidence limit of the arithmetic mean concentrations (95% UCLs) of onsite soil (0-10 feet bgs) dataset are used as the representative EPCs. Maximum detected concentrations are bolded and italized.


VOC? a

Diffusivity in air,

Da

(cm2/s)

Henry's Law Constant at Reference

Temperature (25° C),

H (atm-m3/mol)

Organic Carbon Partition

Coefficient, Koc

(cm3/g)

Pure Component Water Solubility,

S (mg/L)

Soil SaturationConcentration,Csat , calculated

(mg/kg)Volatile Organic Compounds1,2,4-Trimethylbenzene Y 6.1E-02 1 7.9E-06 1 6.1E-03 1 2.5E-01 1 1.4E+03 1 5.7E+01 1 2.4E+00 2 NA1,3,5-Trimethylbenzene Y 6.0E-02 1 8.7E-06 1 5.9E-03 1 2.4E-01 1 1.4E+03 1 2.0E+00 1 3.3E+00 2 NA1,3-Butadiene Y 2.5E-01 1 1.1E-05 1 7.3E-02 1 3.0E+00 1 1.9E+01 1 7.4E+02 1 1.8E+03 2 NA2-Butanone (Methyl ethyl ketone) Y 8.1E-02 1 9.8E-06 1 5.6E-05 1 2.3E-03 1 2.3E+00 1 2.2E+05 1 3.8E+01 1 NA4-Ethyltoluene Y 6.8E-02 3 7.8E-06 4 5.0E-03 3 2.1E-01 3 1.8E+03 3 9.5E+01 3 3.0E+00 3 NA4-Methyl-2-pentanone Y 7.5E-02 1 7.8E-06 1 1.4E-04 1 5.6E-03 1 9.1E+00 1 1.9E+04 1 3.0E+01 2 NABenzene Y 8.8E-02 1 9.8E-06 1 5.5E-03 1 2.3E-01 1 5.9E+01 1 1.8E+03 1 9.5E+01 1 3.8E+02Carbon Disulfide Y 1.0E-01 1 1.0E-05 1 3.0E-02 1 1.2E+00 1 4.6E+01 1 1.2E+03 1 3.6E+02 1 NAChloroform Y 1.0E-01 1 1.0E-05 1 3.7E-03 1 1.5E-01 1 4.0E+01 1 7.9E+03 1 1.9E+02 1 NAEthyl Benzene Y 7.5E-02 1 7.8E-06 1 7.9E-03 1 3.2E-01 1 3.6E+02 1 1.7E+02 1 9.5E+00 1 NAFreon 11 Y 8.7E-02 1 9.7E-06 1 9.7E-02 1 4.0E+00 1 5.0E+02 1 1.1E+03 1 5.4E+02 2 3.4E+01Freon 12 Y 6.7E-02 1 9.9E-06 1 3.4E-01 1 1.4E+01 1 4.6E+02 1 2.8E+02 1 1.8E+02 2 NAm,p-Xylene Y 7.0E-02 1 7.8E-06 1 7.3E-03 1 3.0E-01 1 4.1E+02 1 1.6E+02 1 8.5E+00 1 NAo-Xylene Y 8.7E-02 1 1.0E-05 1 5.2E-03 1 2.1E-01 1 3.6E+02 1 1.8E+02 1 6.6E+00 1 NAPropylbenzene Y 6.0E-02 1 7.8E-06 1 1.1E-02 1 4.4E-01 1 5.6E+02 1 6.0E+01 1 3.4E+00 3 NATetrachloroethene Y 7.2E-02 1 8.2E-06 1 1.8E-02 1 7.5E-01 1 1.6E+02 1 2.0E+02 1 1.7E+01 1 NATetrahydrofuran Y 1.0E-01 3 1.1E-05 4 7.1E-05 3 2.9E-03 3 1.1E+00 3 1.0E+06 3 7.4E+02 3 NAToluene Y 8.7E-02 1 8.6E-06 1 6.6E-03 1 2.7E-01 1 1.8E+02 1 5.3E+02 1 2.9E+01 1 NAPolycylic Aromatic HydrocarbonsAcenaphthene Y 4.2E-02 1 7.7E-06 1 1.5E-04 1 6.3E-03 1 7.1E+03 1 3.6E+00 1 2.7E-03 1 3.4E+01Acenaphthylene N NA NA 1.1E-04 3 4.7E-03 3 3.6E+03 3 1.6E+01 3 9.1E-04 3 NABenzo(a)anthracene N NA NA 1.2E-05 2 4.9E-04 2 1.8E+05 2 9.4E-03 2 1.9E-06 3 NABenzo(a)pyrene N NA NA 4.6E-07 2 1.9E-05 2 5.9E+05 2 1.6E-03 2 5.5E-09 3 NABenzo(b)fluoranthene N NA NA 1.1E-04 1 4.5E-03 1 1.2E+06 1 1.5E-03 1 5.0E-07 1 NABenzo(g,h,i)perylene N NA NA 3.3E-07 3 1.4E-05 3 1.9E+06 3 2.6E-04 3 2.4E-10 3 NABenzo(k)fluoranthene N NA NA 5.8E-07 2 2.4E-05 2 5.9E+05 2 8.0E-04 2 9.7E+10 3 NAChrysene N NA NA 9.4E-05 1 3.9E-03 1 4.0E+05 1 6.3E-03 1 2.0E-06 1 NAFluoranthene N NA NA 8.9E-06 2 3.6E-04 2 5.5E+04 2 2.6E-01 2 8.7E-06 3 NAIndeno(1,2,3-c,d)pyrene N NA NA 3.5E-07 2 1.4E-05 2 2.0E+06 2 1.9E-04 2 3.5E-07 3 NANaphthalene Y 5.9E-02 1 7.5E-06 1 4.8E-04 1 2.0E-02 1 2.0E+03 1 3.1E+01 1 8.9E-02 1 8.6E+01

TABLE 4-6CHEMICAL PROPERTIES FOR CHEMICALS OF POTENTIAL CONCERN


Chemical

Vapor Pressure, VP

(mmHg)

Diffusivity in water,

Dw

(cm2/s)

Dimensionless Henry's Law Constant at Reference


H'(unitless)


VOC? a

Diffusivity in air,

Da

(cm2/s)

Henry's Law Constant at Reference


H (atm-m3/mol)

Organic Carbon Partition

Coefficient, Koc

(cm3/g)

Pure Component Water Solubility,

S (mg/L)

Soil SaturationConcentration,Csat , calculated

(mg/kg)

TABLE 4-6CHEMICAL PROPERTIES FOR CHEMICALS OF POTENTIAL CONCERN


Chemical

Vapor Pressure, VP

(mmHg)

Diffusivity in water,

Dw

(cm2/s)

Dimensionless Henry's Law Constant at Reference


H'(unitless)

Phenanthrene N NA NA 4.2E-05 3 1.7E-03 3 1.2E+04 3 1.2E+00 3 1.1E-04 3 NAPyrene N NA NA 1.1E-05 1 4.5E-04 1 1.1E+05 1 1.4E+00 1 5.6E-05 1 NAMetalsBarium N NA NA NA NA NA NA NA NAChromium N NA NA NA NA NA NA NA NACobalt N NA NA NA NA NA NA NA NACopper N NA NA NA NA NA NA NA NALead N NA NA NA NA NA NA NA NANickel N NA NA NA NA NA NA NA NASelenium N NA NA NA NA NA NA NA NAVanadium N NA NA NA NA NA NA NA NAZinc N NA NA NA NA NA NA NA NA

Notes:Not applicable or not available.

a

Sources:1.

2.

3.

4.5.

SRC PhysProp Database. 2002. found at http://esc.syrres.com/interkow/physdemo.htm and methods from Schwarzenback R. P. et al. 1993. Environmental Organic Chemistry. John Wiley and Sons, Inc., New York, NY.

United States Environmental Protection Agency (USEPA). 2011. From USEPA Regional Screening Levels for Chemical Contaminants at Superfund Sites , June, 2011. Available at: http://www.epa.gov/reg3hwmd/risk/human/rb-concentration_table/index.htm.

California Environmental Protection Department (Cal/EPA). 2011. Department of Toxic Substances Control (DTSC). Human and Ecological Risk Division (HERO). Johnson and Ettinger screening-level soil gas model contained in Excel spreadsheet “HERD_Soil_Gas_Screening_Model.xls”. December 6.

USEPA. 2006. Water9, Version 3. June 29. URL: http://www.epa.gov/ttn/chief/software/water/water9_3.California Environmental Protection Agency (Cal/EPA). 1994. Preliminary Endangerment Assessment Guidance Manual. Department of Toxic Substances Control. January.

NA = VOC = Volatile organic compound. Consistent with Cal/EPA guidance, volatile chemicals are defined as having a Henry's Law Constant [atm-m3/mol] greater than 1 x 10-5

and a vapor pressure greater than 1x10-3 (Cal/EPA 1994).


(mg/m3)-1 (mg/kg-day)-1

Inhalation Source Oral Source Inhalation Source Oral Source

Volatile Organic Compounds1,2,4-Trimethylbenzene NC 1 NC 1 7.0E-03 4 5.0E-02 71,3,5-Trimethylbenzene NC 1 NC 1 6.0E-03 7 5.0E-02 71,3-Butadiene 1.7E-01 1 3.4E+00 1 2.0E-03 2 5.7E-04 2a2-Butanone (Methyl ethyl ketone) NC 1 NC 1 5.0E+00 2 6.0E-01 24-Ethyltoluene NC 1 NC 1 1.0E-01 2b 2.0E-01 2b4-Methyl-2-pentanone NC 1 NC 1 3.0E+00 2 8.0E-02 6Benzene 2.9E-02 1 1.0E-01 1 3.0E-02 2 4.0E-03 2Carbon Disulfide NC 1 NC 1 7.0E-01 2 1.0E-01 2Chloroform 5.3E-03 1 3.1E-02 1 3.0E-01 1 1.0E-02 2Ethyl Benzene 2.5E-03 1 1.1E-02 1 1.0E+00 2 1.0E-01 2Freon 11 NC 1 NC 1 7.0E-01 6 3.0E-01 2Freon 12 NC 1 NC 1 2.0E-01 6 2.0E-01 2m,p-Xylene NC 1 NC 1 1.0E-01 2 2.0E-01 2o-Xylene NC 1 NC 1 1.0E-01 2 2.0E-01 2Propylbenzene NC 1 NC 1 1.4E-01 7a 4.0E-02 7Tetrachloroethene 5.9E-03 1 5.4E-01 1 3.5E-02 1 6.0E-03 2Tetrahydrofuran 2.0E-03 8 7.6E-03 8 3.0E-01 7 2.1E-01 7Toluene NC 1 NA 1 3.0E-01 1 8.0E-02 2Polycylic Aromatic HydrocarbonsAcenaphthene NC 1 NC 1 2.1E-01 2a 6.0E-02 2Acenaphthylene NC 1 NC 1 2.1E-01 2c 6.0E-02 2cBenzo(a)anthracene na 1 na 1 1.1E-01 2d 3.0E-02 2dBenzo(a)pyrene na 1 na 1 1.1E-01 2d 3.0E-02 2dBenzo(b)fluoranthene na 1 na 1 1.1E-01 2d 3.0E-02 2dBenzo(g,h,i)perylene NC 1 NC 1 1.1E-01 2d 3.0E-02 2dBenzo(k)fluoranthene na 1 na 1 1.1E-01 2d 3.0E-02 2dChrysene na 1 na 1 1.1E-01 2d 3.0E-02 2dFluoranthene NC 1 NC 1 1.4E-01 2a 4.0E-02 2Indeno(1,2,3-c,d)pyrene na 1 na 1 1.1E-01 2d 3.0E-02 2dNaphthalene 3.4E-02 1 1.2E-01 1a 3.0E-03 2 2.0E-02 2Phenanthrene NC 1 NC 1 1.1E+00 2e 3.0E-01 2ePyrene NC 1 NC 1 1.1E-01 2a 3.0E-02 2MetalsBarium NC 1 NC 1 5.0E-04 6 2.0E-01 2Chromium NC 1f NC 1f 5.3E+00 2f 1.5E+00 2fCobalt 9.0E+00 4 NC 1 6.0E-06 4 3.0E-04 4Copper NC 1 NC 1 1.4E-01 6a 4.0E-02 6iLead NA g NA g NA g NA gNickel 2.6E-01 1 NC h 1.4E-05 1 2.0E-02 2Selenium NC 1 NC 1 2.0E-02 1 5.0E-03 1Vanadium NC 1 NC 1 1.0E-04 3 5.0E-03 5Zinc NC 1 NC 1 1.1E+00 2a 3.0E-01 2

TABLE 4-7CARCINOGENIC AND NONCARCINOGENIC TOXICITY VALUES FOR CHEMICALS OF POTENTIAL CONCERN


(mg/kg-day)

Reference Concentration

(RfC) (mg/m3)

Chemical

Unit Risk Factor (URF)

Cancer Slope Factor (CSF)

Chronic Noncancer Reference Dose (RfD)


TABLE 4-7CARCINOGENIC AND NONCARCINOGENIC TOXICITY VALUES FOR CHEMICALS OF POTENTIAL CONCERN


Notes:

a

b

c

d

e

f

g

h

i

Sources:1.

2.

3.

4.

5.

6.

7. United States Environmental Protection Agency (USEPA). 2004. USEPA Region 9, Preliminary Remediation Goals (PRGs), October.

Surrogate value - assumes toxicity for total xylenes.

Surrogate value - assumes toxicity for anthracene.

This chemical is not considered a carcinogen by the ingestion route.

NC = na =

Not available or not applicable. Not considered to be a carcinogen.Carcinogenic PAHs (CPAHs) evalauted using benzo(a)pyrene equivalency method for soil.

NA =

Route-to-route extrapolation.

Toxicity values for Chromium (III).

Surrogate value - assumes toxicity for acenaphthene.

Superfund Health Risk Technical Support Center (STSC). 2011. STSC's Provisional Peer Reviewed Toxicity Values (PPRTV) from USEPA Regional Screening Levels for Chemical Contaminants at Superfund Sites , November, 2011.

United States Environmental Protection Agency (USEPA). 1997. Health Effects Assessment Summary Tables. FY 1997 Update. July. Office of Solid Waste and Emergency Response (OSWER).

United States Environmental Protection Agency (USEPA). 2012. Integrated Risk Information System Database . Maintained at http://www.epa.gov/iris/index.html.

United States Environmental Protection Agency (USEPA) 2011. USEPA Regional Screening Levels for Chemical Contaminants at Superfund Sites, November, 2011. Available at http://www.epa.gov/reg3hwmd/risk/human/rb-concentration_table/Generic_Tables/pdf/master_sl_table_run_NOV2011.pdf

California Environmental Protection Agency (Cal/EPA), Office of Environmental Health Hazard Assessment (OEHHA). 2012. Table of cancer slope factors maintained at http://www.oehha.ca.gov/risk/ChemicalDB/index.asp; table of chronic RELs maintained online at http://www.oehha.ca.gov/air/allrels.html.

Agency for Toxic Substances and Disease Registry (ATSDR) from USEPA Regional Screening Levels for Chemical Contaminants at Superfund Sites , November, 2011.

The RfD for copper is based on drinking water standard of 1.3 mg/L.

Because the USEPA has not developed an RfD for this chemical, the noncancer RfD for pyrene is used as a surrogate value.

Lead exposure is evaluated using Cal/EPA OEHHA's benchmark approach. See text for details.


Sample ID a

Sample Depth

(ft bgs)Sample

Date

Benzo(a)pyrene Equivalent b

(mg/kg)A1-T1 S06 8.0 7/20/2007 0.093A1-T1 S07 9.0 7/20/2007 0.0088A4-B2 S02 2.0 7/19/2007 0.0088A4-B2 S03 3.5 7/19/2007 0.0088A4-B3 S01 1.5 7/19/2007 0.0088A4-B3 S02 3.0 7/19/2007 0.033B2-B1 S04 5.0 7/19/2007 0.0088B2-B1 S05 6.5 7/19/2007 0.0088B3-B1 S03 3.5 7/19/2007 0.0088B3-B1 S04 5.0 7/19/2007 0.0088B4-B1 S04 5.0 7/19/2007 0.0088B-MAD-1-5.0-6.5A 5.0 2/4/1991 0.0012C1-B1 S03 2.0 7/18/2007 0.0088C1-B1 S04 5.0 7/18/2007 0.0088C2-B1 S02 2.0 7/19/2007 0.093C2-B1 S03 3.5 7/19/2007 0.0088C2-T1 S05 5.0 7/20/2007 0.018C3-T1 S04 4.0 7/20/2007 0.045C3-T1 S05 5.3 7/20/2007 0.0088C4-B1 S02 2.0 7/19/2007 0.0095C4-B1 S03 3.5 7/19/2007 0.0088C4-B2 S02 2.0 7/19/2007 0.0088C4-B2 S03 3.5 7/19/2007 0.052C4-B2 S04 5.0 7/19/2007 0.0088C4-B2 S05 6.5 7/19/2007 0.0088MW04 S04 3.5 7/30/2007 0.016MW-06-S01 0.5 7/30/2007 0.19MW-06-S02 2.0 7/30/2007 0.0088MW-MAD-1-5-6.5A 5.0 2/6/1991 0.0012V-A1-F1-2 2.0 9/6/2011 0.0088V-A1-F2-3 3.0 9/6/2011 0.0088V-A1-F3-4 4.0 9/7/2011 0.0088V-A1-F4-2 2.0 9/27/2011 0.0088V-A1-W3-2-3 2.0 9/7/2011 0.019

TABLE 4-8

SUMMARY OF REPRESENTATIVE POST-EXCAVATION CPAH DATA FOR ONSITE SOIL (0-10 FEET BGS)


era_Closure_HRA_Tables Page 1 of 4 IRIS ENVIRONMENTAL

Sample ID a

Sample Depth

(ft bgs)Sample

Date


(mg/kg)

TABLE 4-8



V-A2-F1-3.5 3.5 8/12/2011 0.0088V-A2-F2-8 8.0 9/6/2011 0.0088V-A2-F3-5 5.0 9/7/2011 0.0088V-A2-F4-5.5 5.5 9/7/2011 0.044V-A2-W11-10 10.0 10/3/2011 0.070V-A2-W11-5 5.0 10/3/2011 0.0088V-A2-W9-5 5.0 9/29/2011 0.0088V-A3-F2-10 10.0 8/10/2011 0.0088V-A3-W15-10 10.0 10/4/2011 0.0088V-A3-W15-6 6.0 10/4/2011 0.0088V-A3-W6-5-6.5 5.0 8/10/2011 0.0088V-A3-W6-9-10 9.0 8/10/2011 0.0088V-A3-W7-5-6.5 5.0 8/10/2011 0.0088V-A3-W7-9-10 9.0 8/10/2011 0.0088V-A4-F1-5 5.0 8/9/2011 0.0088V-A4-F3-2 2.0 10/4/2011 0.0088V-A4-W11-0-1.5 0.0 10/7/2011 0.0088V-A4-W12-0-1.5 0.0 10/7/2011 0.0088V-A4-W3-0-2 0.0 8/11/2011 0.068V-A4-W3-2-3.5 2.0 8/11/2011 0.0088V-A4-W3-3.5-5 3.5 8/11/2011 0.0088V-A4-W4-0-2 0.0 8/11/2011 0.10V-A4-W4-2-3.5 2.0 8/11/2011 0.0088V-A4-W4-3.5-5 3.5 8/11/2011 0.0094V-A4-W5-0-2 0.0 9/13/2011 0.0088V-A4-W5-7 7.0 9/13/2011 0.0088V-A4-W7-0.5-2 0.5 9/16/2011 0.089V-A4-W7-2-3.5 2.0 9/16/2011 0.0088V-A4-W7-3.5-5 3.5 9/16/2011 0.0088V-A5-F1-10 10.0 8/8/2011 0.0088V-A5-F2-10 10.0 8/8/2011 0.0088V-A5-F3-10 10.0 8/8/2011 0.0088V-A5-F4-10 10.0 8/15/2011 0.0088V-A5-F5-6.5 5.0 8/9/2011 0.0088


Sample ID a

Sample Depth

(ft bgs)Sample

Date


(mg/kg)

TABLE 4-8



V-B1-F1-3.5 3.5 8/24/2011 0.0088V-B1-F2-5 5.0 9/7/2011 0.016V-B1-W1-3.5-5 3.5 8/8/2011 0.0088V-B1-W1-5-6.5 5.0 8/8/2011 0.0088V-B1-W1-8-10 8.0 8/8/2011 0.0088V-B1-W3-5-6 5.0 8/18/2011 0.0088V-B1-W3-9-10 9.0 8/18/2011 0.0088V-B1-W5-5-6 5.0 8/26/2011 0.0088V-B1-W5-9-10 9.0 8/26/2011 0.0088V-B2-F1-4 4.0 8/24/2011 0.0088V-B2-F2-8 8.0 9/1/2011 0.12V-B2-W3-9 9.0 9/29/2011 0.0088V-B3-F1-2 2.0 9/6/2011 0.0088V-B3-F2-2 2.0 9/6/2011 0.0088V-B4-W1-0-2 0.0 8/15/2011 0.0088V-B4-W1-2-3.5 2.0 8/15/2011 0.0093V-B4-W1-3.5-5 3.5 8/15/2011 0.0088V-B4-W2-0-2 0.0 9/2/2011 0.0088V-B4-W2-2-3.5 2.0 9/2/2011 0.0088V-B4-W2-3.5-5 3.5 9/2/2011 0.0088V-B5-F1-10 10.0 8/22/2011 0.0088V-B5-F2-6 6.0 8/29/2011 0.0088V-B5-F3-3 3.0 8/31/2011 0.0088V-B5-W3-2-3.5 2.0 8/25/2011 0.0088V-B5-W3-3.5-5 3.5 8/25/2011 0.0088V-B5-W6-2-3.5 2.0 8/29/2011 0.0088V-B5-W7-0.5-2 0.5 8/31/2011 0.054V-B5-W7-2-3 2.0 8/31/2011 0.0088V-B5-W8-0.5-2 0.5 9/7/2011 0.13V-B5-W8-2-3 2.0 9/7/2011 0.016V-C1-F5-6 6.0 8/16/2011 0.0088V-C1-F6-10 10.0 8/17/2011 0.0088


Sample ID a

Sample Depth

(ft bgs)Sample

Date


(mg/kg)

TABLE 4-8



V-C1-W1-8-10 8.0 8/3/2011 0.0088V-C1-W2-3.5 3.5 8/4/2011 0.050V-C1-W2-5.5 5.5 8/4/2011 0.0088V-C1-W2-7.5 7.5 8/4/2011 0.0088V-C1-W2-8-10 8.0 8/4/2011 0.15V-C1-W3-3-4 3.0 8/10/2011 0.0088V-C1-W5-2-2.5 2.0 8/10/2011 0.18V-C2-F1-4.5 4.5 8/22/2011 0.0088V-C2-F3-3.5 3.5 8/19/2011 0.0088V-C2-F4-3 3.0 8/31/2011 0.0088V-C2-W4-2-3.5 2.0 8/22/2011 0.018V-C2-W4-3.5-5 3.5 8/22/2011 0.0088V-C3-F1-3 3.0 8/25/2011 0.0088V-C3-F2-3 3.0 8/30/2011 0.0088V-C3-F3-3 3.0 8/30/2011 0.0088V-C3-W3-2-3 2.0 8/30/2011 0.028V-C4-F1-2 2.0 8/30/2011 0.12V-C4-F3-1.5 1.5 9/12/2011 0.0088V-C4-W4-0.5-2 0.5 9/6/2011 0.22V-C4-W5-0-1.5 0.0 9/12/2011 0.0088

Notes:mg/kg = milligrams per kilogram.ft = feet.bgs = below ground surface.CPAH = Carcinogenic Polycyclic Aromatic Hydrocarbons (expressed in benzo(a)pyrene equivalena Higher benzo(a)pyrene equivalent value from the primary or duplicate sample is included in the statistical evaluation and is presented here.b Values in bold and italics are based on non-detects for all seven carcinogenic polycyclic aromatic hydrocarbons (CPAHs).


Summary Statistics CPAHOnsite Soil

(0-10 feet bgs)Number of Samples 120Minimum 0.0012Maximum 0.22Averagea 0.024Standard Deviation 0.04Median 0.008895% UCL b 0.04095th percentile 0.12

Notes:

a Corresponds to the arithmetic average concentration.

Source:

CPAH = Carcinogenic Polycyclic Aromatic Hydrocarbons (expressed in benzo(a)pyrene equivalents)

b 95% Upper Confidence Limit (UCL) for soils calculated by USEPA ProUCL Version 4.1 Statistical Program (USEPA 2010).

U.S. Environmental Protection Agency (USEPA). 2010. ProUCL Version 4.1 User Guide (Draft). EPA/600/R-07/041. May .

TABLE 4-9

SUMMARY STATISTICS FOR REPRESENTATIVE POST-EXCAVATION CPAH DATASET FOR ONSITE SOIL (0-10 FEET BGS)



Summary Statistics

Northern California CPAH

Ambient DataNumber of Samples 86Minimum 0.0027Maximum 2.8Average a 0.21Standard Deviation 0.4295% UCLb 0.40UTLc (95% coverage, 95% confidence) 1.5095th Percentile 0.92

Notes:

a

b

c

Corresponds to the 95% Upper confidence limit (UCL) of the mean calculated based on the assumption of lognormality.

Corresponds to the Upper Tolerance Limit (with 95% coverage and 95% confidence) calculated based on the assumption of lognormality.

CPAH = Carcinogenic polycyclic aromatic hydrocarbons, expressed in terms of benzo(a)pyrene equivalents.

TABLE 4-10SUMMARY STATISTICS FOR NORTHERN CALIFORNIA


Corresponds to the arithmetic average concentration.


Area Sample ID a

Sample Depth(ft bgs)

Sample Date

Arsenic b

(mg/kg)Site A4-B2 S02 2 7/19/2007 1.0Site A4-B3 S01 1.5 7/19/2007 1.0Site A4-B3 S02 3 7/19/2007 1.0Site B-MAD-1-5.0-6.5A 5 2/4/1991 3.0Site C1-B1 S03 2 7/18/2007 1.0Site C2-B1 S02 2 7/19/2007 1.0Site C2-T1 S05 5 7/20/2007 1.0Site C3-T1 S04 4 7/20/2007 1.0Site C3-T1 S05 5.3 7/20/2007 1.0Site C4-B1 S02 2 7/19/2007 1.0Site C4-B2 S02 2 7/19/2007 1.0Site MW-06-S01 0.5 7/30/2007 7.4Site MW-06-S02 2 7/30/2007 1.0Site MW-MAD-1-5-6.5A 5 2/6/1991 3.0Site PT1-5-6.5 5 7/26/2011 2.5Site PT6-3.5-5 3.5 7/27/2011 11.2Site V-A1-F1-2 2 9/6/2011 1.0Site V-A1-F2-3 3 9/6/2011 1.0Site V-A1-F3-4 4 9/7/2011 1.0Site V-A1-F4-2 2 9/27/2011 1.0Site V-A1-W3-2-3 2 9/7/2011 1.0Site V-A2-F1-3.5 3.5 8/12/2011 1.0Site V-A2-F2-8 8 9/6/2011 1.0Site V-A2-F3-5 5 9/7/2011 1.0Site V-A2-F4-5.5 5.5 9/7/2011 1.0Site V-A2-W11-10 10 10/3/2011 1.0Site V-A2-W11-5 5 10/3/2011 1.0Site V-A2-W9-5 5 9/29/2011 1.0Site V-A3-W15-10 10 10/4/2011 1.0Site V-A3-W15-6 6 10/4/2011 1.0Site V-A3-W6-5-6.5 5 8/10/2011 1.0Site V-A3-W6-9-10 9 8/10/2011 1.0Site V-A3-W7-5-6.5 5 8/10/2011 1.0Site V-A3-W7-9-10 9 8/10/2011 1.0Site V-A4-F1-5 5 8/9/2011 5.34Site V-A4-F3-2 2 10/4/2011 1.0Site V-A4-W11-0-1.5 0 10/7/2011 1.0Site V-A4-W12-0-1.5 0 10/7/2011 1.0Site V-A4-W3-0-2 0 8/11/2011 2.5Site V-A4-W3-2-3.5 2 8/11/2011 2.5Site V-A4-W3-3.5-5 3.5 8/11/2011 2.5Site V-A4-W4-0-2 0 8/11/2011 2.5Site V-A4-W4-2-3.5 2 8/11/2011 2.5Site V-A4-W4-3.5-5 3.5 8/11/2011 2.5Site V-A4-W5-0-2 0 9/13/2011 1.0

TABLE 4-11SUMMARY OF REPRESENTATIVE POST-EXCAVATION ARSENIC DATA

FOR ONSITE SOIL (0-10 FEET BGS)Former Madera Manufactured Gas Plant

Madera, California


Area Sample ID a


Sample Date

Arsenic b

(mg/kg)



Madera, California

Site V-A4-W5-7 7 9/13/2011 1.0Site V-A4-W7-0.5-2 0.5 9/16/2011 8.6Site V-A4-W7-2-3.5 2 9/16/2011 1.0Site V-A4-W7-3.5-5 3.5 9/16/2011 1.0Site V-A5-F1-10 10 8/8/2011 1.0Site V-A5-F2-10 10 8/8/2011 13.2Site V-A5-F3-10 10 8/8/2011 1.0Site V-A5-F4-10 10 8/15/2011 1.0Site V-A5-F5-6.5 5 8/9/2011 5.5Site V-B1-F1-3.5 3.5 8/24/2011 1.0Site V-B1-F2-5 5 9/7/2011 1.0Site V-B1-W1-3.5-5 3.5 8/8/2011 1.0Site V-B1-W1-5-6.5 5 8/8/2011 1.0Site V-B1-W1-8-10 8 8/8/2011 1.0Site V-B1-W3-5-6 5 8/18/2011 1.0Site V-B1-W3-9-10 9 8/18/2011 1.0Site V-B1-W5-5-6 5 8/26/2011 1.0Site V-B1-W5-9-10 9 8/26/2011 1.0Site V-B2-F1-4 4 8/24/2011 1.0Site V-B2-F2-8 8 9/1/2011 1.0Site V-B2-W3-9 9 9/29/2011 1.0Site V-B3-F1-2 2 9/6/2011 1.0Site V-B3-F2-2 2 9/6/2011 1.0Site V-B4-W1-0-2 0 8/15/2011 1.0Site V-B4-W1-2-3.5 2 8/15/2011 1.0Site V-B4-W1-3.5-5 3.5 8/15/2011 1.0Site V-B4-W2-0-2 0 9/2/2011 1.0Site V-B4-W2-2-3.5 2 9/2/2011 13.7Site V-B4-W2-3.5-5 3.5 9/2/2011 1.0Site V-B5-F1-10 10 8/22/2011 13.7Site V-B5-F2-6 6 8/29/2011 2.5Site V-B5-F3-3 3 8/31/2011 2.5Site V-B5-W3-2-3.5 2 8/25/2011 4.87Site V-B5-W3-3.5-5 3.5 8/25/2011 6.54Site V-B5-W6-2-3.5 2 8/29/2011 2.5Site V-B5-W7-0.5-2 0.5 8/31/2011 2.5Site V-B5-W7-2-3 2 8/31/2011 2.5Site V-B5-W8-0.5-2 0.5 9/7/2011 5.94Site V-B5-W8-2-3 2 9/7/2011 5.58Site V-C1-F5-6 6 8/16/2011 1.0Site V-C1-F6-10 10 8/17/2011 1.0Site V-C1-W1-8-10 8 8/3/2011 1.0Site V-C1-W2-3.5 3.5 8/4/2011 1.0Site V-C1-W2-5.5 5.5 8/4/2011 1.0Site V-C1-W2-7.5 7.5 8/4/2011 1.0


Area Sample ID a


Sample Date

Arsenic b

(mg/kg)



Madera, California

Site V-C1-W2-8-10 8 8/4/2011 1.0Site V-C1-W3-3-4 3 8/10/2011 1.0Site V-C1-W5-2-2.5 2 8/10/2011 1.0Site V-C2-F1-4.5 4.5 8/22/2011 1.0Site V-C2-F3-3.5 3.5 8/19/2011 1.0Site V-C2-F4-3 3 8/31/2011 1.0Site V-C2-W4-2-3.5 2 8/22/2011 1.0Site V-C2-W4-3.5-5 3.5 8/22/2011 1.0Site V-C3-F1-3 3 8/25/2011 1.0Site V-C3-F2-3 3 8/30/2011 1.0Site V-C3-F3-3 3 8/30/2011 1.0Site V-C4-F1-2 2 8/30/2011 1.0Site V-C4-F3-1.5 1.5 9/12/2011 1.0Site V-C4-W4-0.5-2 0.5 9/6/2011 1.0Site V-C4-W5-0-1.5 0 9/12/2011 1.0

Notes:mg/kg = milligrams per kilogram.ft = feet.bgs = below ground surface.

b Non-detect values in table represet the reporting limit, and are presented in bold and italics.

a Higher arsenic value from the primary or duplicate sample is included in the statistical evaluation and is presented here.


Summary Statistics Onsite Soil(0-10 feet bgs)

Number of Samples 105Minimum Detect 3.0Maximum Detect 13.7Averagea 1.5Standard Deviation 2.8Median 0.595% UCL b 5.895th percentile 7.2

Notes:

Source:

b 95% Upper Confidence Limit (UCL) for soils calculated by USPEA ProUCL Version 4.1 Statistical Program (USEPA 2010).

U.S. Environmental Protection Agency (USEPA). 2010. ProUCL Version 4.1 User Guide (Draft). EPA/600/R-07/041. May .

a Corresponds to the arithmetic average concentration.

TABLE 4-12SUMMARY STATISTICS FOR REPRESENTATIVE POST-EXCAVATION

ARSENIC DATASET FOR ONSITE SOIL (0-10 FEET BGS)Former Madera Manufactured Gas Plant

Madera, California


Future Onsite Resident, Age-Adjusted

EC:Particulate Inhalation(mg/m3)

CDI:Dermal Contact

(mg/kg-day)

CDI:Ingestion

(mg/kg-day)Volatile Organic CompoundsBenzene 1.2E-12 2.2E-09 6.8E-09Polycyclic Aromatic HydrocarbonsAcenaphthene NC NC NCAcenaphthylene NC NC NCBenzo(a)anthracene NA NA NABenzo(a)pyrene NA NA NABenzo(b)fluoranthene NA NA NABenzo(g,h,i)perylene NC NC NCBenzo(k)fluoranthene NA NA NAChrysene NA NA NAFluoranthene NC NC NCIndeno(1,2,3-c,d)pyrene NA NA NANaphthalene 1.3E-10 3.7E-07 7.7E-07Phenanthrene NC NC NCPyrene NC NC NCMetalsBarium NC NC NCTotal Chromium NC NC NCCobalt 2.1E-09 NC NCCopper NC NC NCLead na na naNickel 2.0E-09 NC NCSelenium NC NC NCVanadium NC NC NCZinc NC NC NC

Notes:Chronic Daily IntakeExposure ConcentrationNot available. Carcinogenic PAHs are evaluated using benzo(a)pyrene equivalents

Not considered a carcinogen

TABLE 4-13EXPOSURE CONCENTRATION AND CHRONIC DAILY INTAKE FOR CARCINOGENS IN

ONSITE SOIL: FUTURE ONSITE RESIDENTIAL SCENARIOFormer Madera Manufactured Gas Plant

Madera, California

Chemical

Soil Pathway

CDI =

NC =

EC = NA = na = Not applicable. Potential exposure to lead is evaluated using LEADSPREAD 8. Please see text for

discussion.


Future Onsite Resident Child Future Onsite Resident Adult


CDI:Dermal Contact

(mg/kg-day)

CDI:Ingestion(mg/kg-

day)


CDI:Dermal Contact

(mg/kg-day)

CDI:Ingestion(mg/kg-

day)

Volatile Organic CompoundsBenzene 3.5E-12 1.6E-08 5.6E-08 3.5E-12 2.4E-09 6.0E-09Polycyclic Aromatic HydrocarbonsAcenaphthene 1.8E-11 1.2E-07 2.9E-07 1.8E-11 1.8E-08 3.1E-08Acenaphthylene 6.8E-11 4.8E-07 1.1E-06 6.8E-11 7.0E-08 1.2E-07Benzo(a)anthracene 1.8E-11 1.3E-07 3.0E-07 1.8E-11 1.9E-08 3.2E-08Benzo(a)pyrene 2.1E-11 1.5E-07 3.4E-07 2.1E-11 2.2E-08 3.6E-08Benzo(b)fluoranthene 2.9E-11 2.0E-07 4.6E-07 2.9E-11 3.0E-08 5.0E-08Benzo(g,h,i)perylene 3.2E-11 2.3E-07 5.2E-07 3.2E-11 3.3E-08 5.6E-08Benzo(k)fluoranthene 1.6E-11 1.1E-07 2.6E-07 1.6E-11 1.7E-08 2.8E-08Chrysene 1.5E-11 1.0E-07 2.4E-07 1.5E-11 1.5E-08 2.5E-08Fluoranthene 2.7E-11 1.9E-07 4.4E-07 2.7E-11 2.8E-08 4.8E-08Indeno(1,2,3-c,d)pyrene 2.0E-11 1.4E-07 3.3E-07 2.0E-11 2.1E-08 3.5E-08Naphthalene 3.9E-10 2.7E-06 6.3E-06 3.9E-10 4.0E-07 6.8E-07Phenanthrene 1.8E-11 1.3E-07 3.0E-07 1.8E-11 1.9E-08 3.2E-08Pyrene 3.6E-11 2.5E-07 5.8E-07 3.6E-11 3.7E-08 6.2E-08MetalsBarium 1.0E-07 4.7E-05 1.6E-03 1.0E-07 6.9E-06 1.7E-04Total Chromium 9.7E-09 4.5E-06 1.6E-04 9.7E-09 6.7E-07 1.7E-05Cobalt 6.0E-09 2.8E-06 9.7E-05 6.0E-09 4.2E-07 1.0E-05Copper 7.1E-09 3.3E-06 1.2E-04 7.1E-09 4.9E-07 1.2E-05Lead na na na na na naNickel 5.9E-09 2.7E-06 9.5E-05 5.9E-09 4.0E-07 1.0E-05Selenium 8.7E-10 4.1E-07 1.4E-05 8.7E-10 6.0E-08 1.5E-06Vanadium 2.9E-08 1.4E-05 4.7E-04 2.9E-08 2.0E-06 5.0E-05Zinc 3.2E-08 1.5E-05 5.1E-04 3.2E-08 2.2E-06 5.5E-05

Notes:Chronic Daily IntakeExposure Concentration

TABLE 4-14EXPOSURE CONCENTRATION AND CHRONIC DAILY INTAKE FOR NONCARCINOGENS

IN ONSITE SOIL: FUTURE ONSITE RESIDENTIAL SCENARIOFormer Madera Manufactured Gas Plant

Madera, California

Chemical

Soil Pathway Soil Pathway

CDI = EC = na = Not applicable. Potential exposure to lead is evaluated using LEADSPREAD 8. Please see text for discussion.


Future Onsite Resident, Age-Adjusted

Particulate Inhalation

Dermal Contact Ingestion

Total Cancer

RiskVolatile Organic CompoundsBenzene 3.4E-14 2.2E-10 6.8E-10 9.0E-10Polycyclic Aromatic HydrocarbonsAcenaphthene NC NC NC NCAcenaphthylene NC NC NC NCBenzo(a)anthracene NA NA NA NABenzo(a)pyrene NA NA NA NABenzo(b)fluoranthene NA NA NA NABenzo(g,h,i)perylene NC NC NC NCBenzo(k)fluoranthene NA NA NA NAChrysene NA NA NA NAFluoranthene NC NC NC NCIndeno(1,2,3-c,d)pyrene NA NA NA NANaphthalene 4.5E-12 4.5E-08 9.3E-08 1.4E-07Phenanthrene NC NC NC NCPyrene NC NC NC NCMetalsBarium NC NC NC NCTotal Chromium NC NC NC NCCobalt 1.9E-08 NC NC 1.9E-08Copper NC NC NC NCLead na na na naNickel 5.2E-10 NC NC 5.2E-10Selenium NC NC NC NCVanadium NC NC NC NCZinc NC NC NC NC

Total Cancer Risk 1.9E-08 4.5E-08 9.3E-08 1.6E-07

Notes:

ChemicalSoil Pathway

TABLE 4-15CANCER RISKS FROM ONSITE SOIL:

FUTURE ONSITE RESIDENTIAL SCENARIOFormer Madera Manufactured Gas Plant

Madera, California

NC = Not considered a carcinogen.

NA = Not available. Carcinogenic PAHs are evaluated using benzo(a)pyrene equivalents. na = Not applicable. Potential exposure to lead is evaluated using LEADSPREAD 8. Please see

text for discussion.


Future Onsite Resident Child Future Onsite Resident Adult



Total Hazard Index



Total Hazard Index

Volatile Organic CompoundsBenzene 1.2E-10 4.1E-06 1.4E-05 1.8E-05 1.2E-10 6.0E-07 1.5E-06 2.1E-06Polycyclic Aromatic HydrocarbonsAcenaphthene 8.4E-11 2.1E-06 4.8E-06 6.8E-06 8.4E-11 3.0E-07 5.1E-07 8.1E-07Acenaphthylene 3.2E-10 7.9E-06 1.8E-05 2.6E-05 3.2E-10 1.2E-06 2.0E-06 3.1E-06Benzo(a)anthracene 1.7E-10 4.3E-06 9.8E-06 1.4E-05 1.7E-10 6.3E-07 1.1E-06 1.7E-06Benzo(a)pyrene 2.0E-10 4.9E-06 1.1E-05 1.6E-05 2.0E-10 7.2E-07 1.2E-06 1.9E-06Benzo(b)fluoranthene 2.7E-10 6.7E-06 1.5E-05 2.2E-05 2.7E-10 9.9E-07 1.7E-06 2.6E-06Benzo(g,h,i)perylene 3.1E-10 7.5E-06 1.7E-05 2.5E-05 3.1E-10 1.1E-06 1.9E-06 3.0E-06Benzo(k)fluoranthene 1.5E-10 3.7E-06 8.6E-06 1.2E-05 1.5E-10 5.5E-07 9.2E-07 1.5E-06Chrysene 1.4E-10 3.4E-06 7.9E-06 1.1E-05 1.4E-10 5.1E-07 8.4E-07 1.4E-06Fluoranthene 2.0E-10 4.8E-06 1.1E-05 1.6E-05 2.0E-10 7.1E-07 1.2E-06 1.9E-06Indeno(1,2,3-c,d)pyrene 1.9E-10 4.8E-06 1.1E-05 1.6E-05 1.9E-10 7.0E-07 1.2E-06 1.9E-06Naphthalene 1.3E-07 1.4E-04 3.2E-04 4.5E-04 1.3E-07 2.0E-05 3.4E-05 5.4E-05Phenanthrene 1.8E-11 4.3E-07 9.9E-07 1.4E-06 1.8E-11 6.4E-08 1.1E-07 1.7E-07Pyrene 3.4E-10 8.4E-06 1.9E-05 2.8E-05 3.4E-10 1.2E-06 2.1E-06 3.3E-06MetalsBarium 2.0E-04 2.3E-04 8.1E-03 8.5E-03 2.0E-04 3.4E-05 8.6E-04 1.1E-03Total Chromium 1.8E-09 3.0E-06 1.0E-04 1.1E-04 1.8E-09 4.5E-07 1.1E-05 1.2E-05Cobalt 1.0E-03 9.4E-03 3.2E-01 3.4E-01 1.0E-03 1.4E-03 3.5E-02 3.7E-02Copper 5.1E-08 8.4E-05 2.9E-03 3.0E-03 5.1E-08 1.2E-05 3.1E-04 3.2E-04Lead na na na na na na na naNickel 4.2E-04 1.4E-04 4.7E-03 5.3E-03 4.2E-04 2.0E-05 5.1E-04 9.5E-04Selenium 4.3E-08 8.2E-05 2.8E-03 2.9E-03 4.3E-08 1.2E-05 3.0E-04 3.1E-04Vanadium 1.7E-06 2.7E-03 9.4E-02 9.7E-02 1.7E-06 4.0E-04 1.0E-02 1.1E-02Zinc 3.0E-08 4.9E-05 1.7E-03 1.8E-03 3.0E-08 7.3E-06 1.8E-04 1.9E-04Total Hazard Index 1.6E-03 1.3E-02 4.4E-01 4.5E-01 1.6E-03 1.9E-03 4.7E-02 5.1E-02

Notes:

ChemicalSoil Pathway Soil Pathway

TABLE 4-16NONCANCER HAZARD INDICES FROM ONSITE SOIL:

FUTURE ONSITE RESIDENTIAL SCENARIOFormer Madera Manufactured Gas Plant

Madera, California

na = Not applicable. Potential exposure to lead is evaluated using LEADSPREAD 8. Please see text for discussion.

Madera_Closure_HRA_Tables 1 of 1 IRIS ENVIRONMENTAL

INPUT OUTPUT

MEDIUM LEVEL PRG-90Lead in Soil/Dust (ug/g) 5.3 50th 90th 95th 98th 99th (ug/g)Respirable Dust (ug/m3) 1.5 BLOOD Pb, CHILD 0.0 0.1 0.1 0.1 0.1 77

BLOOD Pb, PICA CHILD 0.1 0.1 0.2 0.2 0.2 39

unitsDays per week days/wkGeometric Standard Deviation PEF ug/dl percent PEF ug/dl percentBlood lead level of concern (ug/dl) Soil Contact 5.8E-5 0.00 1% 0.00 0%Skin area, residential cm2 Soil Ingestion 7.0E-3 0.04 99% 1.4E-2 0.07 100%Soil adherence ug/cm2 Inhalation 2.0E-6 0.00 0% 0.00 0%Dermal uptake constant (ug/dl)/(ug/day)Soil ingestion mg/daySoil ingestion, pica mg/dayIngestion constant (ug/dl)/(ug/day)Bioavailability unitlessBreathing rate m3/dayInhalation constant (ug/dl)/(ug/day)

1

LEAD RISK ASSESSMENT SPREADSHEET 8CALIFORNIA DEPARTMENT OF TOXIC SUBSTANCES CONTROL

EXPOSURE PARAMETERS PATHWAYS

children CHILDREN typical with pica

Percentile Estimate of Blood Pb (ug/dl)

7 Pathway contribution Pathway contribution1.6 Pathway

0.446.8

0.192

2900200

0.00011002000.16

RISK EVALUATION FOR LEAD IN ONSITE SOIL: FUTURE ONSITE RESIDENTIAL SCENARIOTABLE 4-17

Madera, CaliforniaFormer Madera Manufactured Gas Plant

SampleID

Sampling Depth

(feet bgs)a Chemical

Soil Gas Concentration

(mg/m3)b

Attenuation Factor

[(mg/m3)/(mg/m3)]c

Exposure Point Concentration

(EPC) in Indoor Air

(mg/m3)d

Exposure Concentration (EC) in Indoor Air – Cancer

Effects (mg/m3)e

Exposure Concentration (EC) in Indoor

Air – Noncancer Effects (mg/m3)e

Incremental Cancer Risk from Vapor Intrusion (unitless)f

Noncancer Hazard Quotient

from Vapor Intrusion (unitless)f

Cumulative Cancer

Risk

Cumulative Noncancer

Hazard V-A1-V1-5 5 1,2,4-Trimethylbenzene 0.0019 4.0E-04 7.5E-07 3.1E-07 7.2E-07 NC 1.0E-04V-A1-V1-5 5 1,3,5-Trimethylbenzene 0.0019 3.9E-04 7.5E-07 3.1E-07 7.2E-07 NC 1.2E-04V-A1-V1-5 5 1,3-Butadiene 0.00085 1.1E-03 9.2E-07 3.8E-07 8.8E-07 6.4E-08 4.4E-04V-A1-V1-5 5 2-Butanone (Methyl Ethyl Ketone) 0.0046 5.1E-04 2.4E-06 9.7E-07 2.3E-06 NC 4.5E-07V-A1-V1-5 5 4-Ethyltoluene 0.0019 4.4E-04 8.3E-07 3.4E-07 7.9E-07 NC 7.9E-06V-A1-V1-5 5 4-Methyl-2-pentanone 0.0016 4.8E-04 7.6E-07 3.1E-07 7.3E-07 NC 2.4E-07V-A1-V1-5 5 Acetone 0.0037 7.1E-04 2.6E-06 1.1E-06 2.5E-06 NC 8.1E-08V-A1-V1-5 5 Benzene 0.00125 5.4E-04 6.7E-07 2.8E-07 6.4E-07 8.0E-09 2.1E-05V-A1-V1-5 5 Carbon Disulfide 0.0049 6.1E-04 3.0E-06 1.2E-06 2.9E-06 NC 4.1E-06V-A1-V1-5 5 Chloroform 0.0019 6.1E-04 1.2E-06 4.8E-07 1.1E-06 2.5E-09 3.7E-06V-A1-V1-5 5 Ethanol 0.00295 8.0E-04 2.4E-06 9.7E-07 2.3E-06 NC 3.2E-07V-A1-V1-5 5 Ethyl Benzene 0.0017 4.7E-04 8.0E-07 3.3E-07 7.7E-07 8.2E-10 7.7E-07V-A1-V1-5 5 Freon 11 0.0022 5.3E-04 1.2E-06 4.8E-07 1.1E-06 NC 1.6E-06V-A1-V1-5 5 Freon 12 0.00195 4.3E-04 8.3E-07 3.4E-07 8.0E-07 NC 4.0E-06V-A1-V1-5 5 m,p-Xylene 0.0017 4.5E-04 7.6E-07 3.1E-07 7.3E-07 NC 7.3E-06V-A1-V1-5 5 o-Xylene 0.0017 5.3E-04 9.0E-07 3.7E-07 8.7E-07 NC 8.7E-06V-A1-V1-5 5 Propylbenzene 0.0019 3.9E-04 7.5E-07 3.1E-07 7.2E-07 NC 5.1E-06V-A1-V1-5 5 Tetrachloroethene 0.00265 4.6E-04 1.21E-06 5.0E-07 1.2E-06 2.9E-09 3.3E-05V-A1-V1-5 5 Tetrahydrofuran 0.00115 6.1E-04 7.0E-07 2.9E-07 6.7E-07 5.7E-10 2.2E-06V-A1-V1-5 5 Toluene 0.0015 5.3E-04 8.0E-07 3.3E-07 7.6E-07 NC 2.5E-06 7.9E-08 7.7E-04V-A1-V1-15 15 1,2,4-Trimethylbenzene 0.00195 1.4E-04 2.7E-07 1.1E-07 2.6E-07 NC 3.7E-05V-A1-V1-15 15 1,3,5-Trimethylbenzene 0.00195 1.4E-04 2.7E-07 1.1E-07 2.6E-07 NC 4.3E-05V-A1-V1-15 15 1,3-Butadiene 0.00090 4.8E-04 4.4E-07 1.8E-07 4.2E-07 3.0E-08 2.1E-04V-A1-V1-15 15 2-Butanone (Methyl Ethyl Ketone) 0.0047 1.9E-04 8.7E-07 3.6E-07 8.3E-07 NC 1.7E-07V-A1-V1-15 15 4-Ethyltoluene 0.00195 1.5E-04 3.0E-07 1.2E-07 2.9E-07 NC 2.9E-06V-A1-V1-15 15 4-Methyl-2-pentanone 0.00165 1.7E-04 2.8E-07 1.2E-07 2.7E-07 NC 9.0E-08V-A1-V1-15 15 Acetone 0.0075 2.7E-04 2.1E-06 8.4E-07 2.0E-06 NC 6.4E-08V-A1-V1-15 15 Benzene 0.0013 2.0E-04 2.5E-07 1.0E-07 2.4E-07 3.0E-09 8.1E-06V-A1-V1-15 15 Carbon Disulfide 0.0050 2.3E-04 1.1E-06 4.7E-07 1.1E-06 NC 1.6E-06V-A1-V1-15 15 Chloroform 0.00195 2.3E-04 4.4E-07 1.8E-07 4.3E-07 9.7E-10 1.4E-06V-A1-V1-15 15 Ethanol 0.0030 3.2E-04 9.6E-07 4.0E-07 9.2E-07 NC 1.3E-07V-A1-V1-15 15 Ethyl Benzene 0.00175 1.7E-04 3.0E-07 1.2E-07 2.8E-07 3.0E-10 2.8E-07V-A1-V1-15 15 Freon 11 0.00225 1.9E-04 4.4E-07 1.8E-07 4.2E-07 NC 6.0E-07V-A1-V1-15 15 Freon 12 0.0043 1.5E-04 6.5E-07 2.7E-07 6.2E-07 NC 3.1E-06V-A1-V1-15 15 m,p-Xylene 0.00175 1.6E-04 2.8E-07 1.1E-07 2.7E-07 NC 2.7E-06V-A1-V1-15 15 o-Xylene 0.00175 1.9E-04 3.4E-07 1.4E-07 3.3E-07 NC 3.3E-06V-A1-V1-15 15 Propylbenzene 0.00195 1.4E-04 2.7E-07 1.1E-07 2.6E-07 NC 1.8E-06V-A1-V1-15 15 Tetrachloroethene 0.026 1.6E-04 4.2E-06 1.7E-06 4.1E-06 1.0E-08 1.2E-04V-A1-V1-15 15 Tetrahydrofuran 0.0012 2.3E-04 2.7E-07 1.1E-07 2.6E-07 2.2E-10 8.7E-07V-A1-V1-15 15 Toluene 0.0015 1.9E-04 2.9E-07 1.2E-07 2.8E-07 NC 9.3E-07 4.5E-08 4.3E-04

TABLE 4-18VAPOR INTRUSION CANCER RISKS AND NONCANCER HAZARD INDICES FOR VOCS IN SOIL GAS:


FUTURE ONSITE RESIDENTIAL SCENARIO

Madera_Closure_J&E Page 1 of 20 IRIS ENVIRONMENTAL

SampleID

Sampling Depth



(mg/m3)b

Attenuation Factor

[(mg/m3)/(mg/m3)]c


(EPC) in Indoor Air

(mg/m3)d


Effects (mg/m3)e






Cumulative Cancer

Risk


Hazard




V-A2-V1-5 5 1,2,4-Trimethylbenzene 0.0049 4.0E-04 1.9E-06 8.0E-07 1.9E-06 NC 2.7E-04V-A2-V1-5 5 1,3,5-Trimethylbenzene 0.0019 3.9E-04 7.5E-07 3.1E-07 7.2E-07 NC 1.2E-04V-A2-V1-5 5 1,3-Butadiene 0.00085 1.1E-03 9.2E-07 3.8E-07 8.8E-07 6.4E-08 4.4E-04V-A2-V1-5 5 2-Butanone (Methyl Ethyl Ketone) 0.0046 5.1E-04 2.4E-06 9.7E-07 2.3E-06 NC 4.5E-07V-A2-V1-5 5 4-Ethyltoluene 0.0039 4.4E-04 1.7E-06 7.0E-07 1.6E-06 NC 1.6E-05V-A2-V1-5 5 4-Methyl-2-pentanone 0.0016 4.8E-04 7.6E-07 3.1E-07 7.3E-07 NC 2.4E-07V-A2-V1-5 5 Acetone 0.0091 7.1E-04 6.4E-06 2.6E-06 6.2E-06 NC 2.0E-07V-A2-V1-5 5 Benzene 0.0063 5.4E-04 3.4E-06 1.4E-06 3.2E-06 4.0E-08 1.1E-04V-A2-V1-5 5 Carbon Disulfide 0.012 6.1E-04 7.3E-06 3.0E-06 7.0E-06 NC 1.0E-05V-A2-V1-5 5 Chloroform 0.0019 6.1E-04 1.2E-06 4.8E-07 1.1E-06 2.5E-09 3.7E-06V-A2-V1-5 5 Ethanol 0.00295 8.0E-04 2.4E-06 9.7E-07 2.3E-06 NC 3.2E-07V-A2-V1-5 5 Ethyl Benzene 0.0041 4.7E-04 1.9E-06 8.0E-07 1.9E-06 2.0E-09 1.9E-06V-A2-V1-5 5 Freon 11 0.0022 5.3E-04 1.2E-06 4.8E-07 1.1E-06 NC 1.6E-06V-A2-V1-5 5 Freon 12 0.00195 4.3E-04 8.3E-07 3.4E-07 8.0E-07 NC 4.0E-06V-A2-V1-5 5 m,p-Xylene 0.013 4.5E-04 5.8E-06 2.4E-06 5.6E-06 NC 5.6E-05V-A2-V1-5 5 o-Xylene 0.0050 5.3E-04 2.7E-06 1.1E-06 2.5E-06 NC 2.5E-05V-A2-V1-5 5 Propylbenzene 0.0019 3.9E-04 7.5E-07 3.1E-07 7.2E-07 NC 5.1E-06V-A2-V1-5 5 Tetrachloroethene 0.0088 4.6E-04 4.0E-06 1.7E-06 3.9E-06 9.7E-09 1.1E-04V-A2-V1-5 5 Tetrahydrofuran 0.00115 6.1E-04 7.0E-07 2.9E-07 6.7E-07 5.7E-10 2.2E-06V-A2-V1-5 5 Toluene 0.021 5.3E-04 1.1E-05 4.6E-06 1.1E-05 NC 3.6E-05 1.2E-07 1.2E-03V-A2-V1-15 15 1,2,4-Trimethylbenzene 0.0019 1.4E-04 2.6E-07 1.1E-07 2.5E-07 NC 3.6E-05V-A2-V1-15 15 1,3,5-Trimethylbenzene 0.0019 1.4E-04 2.6E-07 1.1E-07 2.5E-07 NC 4.2E-05V-A2-V1-15 15 1,3-Butadiene 0.00085 4.8E-04 4.1E-07 1.7E-07 3.9E-07 2.9E-08 2.0E-04V-A2-V1-15 15 2-Butanone (Methyl Ethyl Ketone) 0.00455 1.9E-04 8.4E-07 3.5E-07 8.1E-07 NC 1.6E-07V-A2-V1-15 15 4-Ethyltoluene 0.0019 1.5E-04 2.9E-07 1.2E-07 2.8E-07 NC 2.8E-06V-A2-V1-15 15 4-Methyl-2-pentanone 0.0016 1.7E-04 2.7E-07 1.1E-07 2.6E-07 NC 8.7E-08V-A2-V1-15 15 Acetone 0.010 2.7E-04 2.7E-06 1.1E-06 2.6E-06 NC 8.5E-08V-A2-V1-15 15 Benzene 0.00125 2.0E-04 2.4E-07 1.0E-07 2.3E-07 2.9E-09 7.8E-06V-A2-V1-15 15 Carbon Disulfide 0.0048 2.3E-04 1.1E-06 4.5E-07 1.0E-06 NC 1.5E-06V-A2-V1-15 15 Chloroform 0.0019 2.3E-04 4.3E-07 1.8E-07 4.2E-07 9.4E-10 1.4E-06V-A2-V1-15 15 Ethanol 0.0029 3.2E-04 9.3E-07 3.8E-07 8.9E-07 NC 1.3E-07V-A2-V1-15 15 Ethyl Benzene 0.0017 1.7E-04 2.9E-07 1.2E-07 2.8E-07 2.9E-10 2.8E-07V-A2-V1-15 15 Freon 11 0.0022 1.9E-04 4.3E-07 1.8E-07 4.1E-07 NC 5.8E-07V-A2-V1-15 15 Freon 12 0.0039 1.5E-04 5.9E-07 2.4E-07 5.6E-07 NC 2.8E-06V-A2-V1-15 15 m,p-Xylene 0.0017 1.6E-04 2.7E-07 1.1E-07 2.6E-07 NC 2.6E-06V-A2-V1-15 15 o-Xylene 0.0017 1.9E-04 3.3E-07 1.4E-07 3.2E-07 NC 3.2E-06V-A2-V1-15 15 Propylbenzene 0.0019 1.4E-04 2.6E-07 1.1E-07 2.5E-07 NC 1.8E-06V-A2-V1-15 15 Tetrachloroethene 0.010 1.6E-04 1.6E-06 6.7E-07 1.6E-06 3.9E-09 4.5E-05V-A2-V1-15 15 Tetrahydrofuran 0.00115 2.3E-04 2.6E-07 1.1E-07 2.5E-07 2.1E-10 8.4E-07V-A2-V1-15 15 Toluene 0.00145 1.9E-04 2.8E-07 1.2E-07 2.7E-07 NC 9.0E-07 3.7E-08 3.5E-04


SampleID

Sampling Depth



(mg/m3)b

Attenuation Factor

[(mg/m3)/(mg/m3)]c


(EPC) in Indoor Air

(mg/m3)d


Effects (mg/m3)e






Cumulative Cancer

Risk


Hazard






SampleID

Sampling Depth



(mg/m3)b

Attenuation Factor

[(mg/m3)/(mg/m3)]c


(EPC) in Indoor Air

(mg/m3)d


Effects (mg/m3)e






Cumulative Cancer

Risk


Hazard




V-B1-V1-5 5 1,2,4-Trimethylbenzene 0.0021 4.0E-04 8.3E-07 3.4E-07 8.0E-07 NC 1.1E-04V-B1-V1-5 5 1,3,5-Trimethylbenzene 0.0021 3.9E-04 8.3E-07 3.4E-07 7.9E-07 NC 1.3E-04V-B1-V1-5 5 1,3-Butadiene 0.00095 1.1E-03 1.0E-06 4.2E-07 9.9E-07 7.2E-08 4.9E-04V-B1-V1-5 5 2-Butanone (Methyl Ethyl Ketone) 0.0050 5.1E-04 2.6E-06 1.1E-06 2.5E-06 NC 4.9E-07V-B1-V1-5 5 4-Ethyltoluene 0.0021 4.4E-04 9.2E-07 3.8E-07 8.8E-07 NC 8.8E-06V-B1-V1-5 5 4-Methyl-2-pentanone 0.00175 4.8E-04 8.3E-07 3.4E-07 8.0E-07 NC 2.7E-07V-B1-V1-5 5 Acetone 0.00405 7.1E-04 2.9E-06 1.2E-06 2.7E-06 NC 8.9E-08V-B1-V1-5 5 Benzene 0.00135 5.4E-04 7.2E-07 3.0E-07 6.9E-07 8.6E-09 2.3E-05V-B1-V1-5 5 Carbon Disulfide 0.0050 6.1E-04 3.0E-06 1.3E-06 2.9E-06 NC 4.2E-06V-B1-V1-5 5 Chloroform 0.0021 6.1E-04 1.3E-06 5.3E-07 1.2E-06 2.8E-09 4.1E-06V-B1-V1-5 5 Ethanol 0.0032 8.0E-04 2.6E-06 1.1E-06 2.5E-06 NC 3.5E-07V-B1-V1-5 5 Ethyl Benzene 0.00185 4.7E-04 8.7E-07 3.6E-07 8.4E-07 9.0E-10 8.4E-07V-B1-V1-5 5 Freon 11 0.0024 5.3E-04 1.3E-06 5.2E-07 1.2E-06 NC 1.7E-06V-B1-V1-5 5 Freon 12 0.0021 4.3E-04 9.0E-07 3.7E-07 8.6E-07 NC 4.3E-06V-B1-V1-5 5 m,p-Xylene 0.00185 4.5E-04 8.3E-07 3.4E-07 7.9E-07 NC 7.9E-06V-B1-V1-5 5 o-Xylene 0.00185 5.3E-04 9.8E-07 4.0E-07 9.4E-07 NC 9.4E-06V-B1-V1-5 5 Propylbenzene 0.0021 3.9E-04 8.3E-07 3.4E-07 7.9E-07 NC 5.7E-06V-B1-V1-5 5 Tetrachloroethene 0.013 4.6E-04 5.9E-06 2.4E-06 5.7E-06 1.4E-08 1.6E-04V-B1-V1-5 5 Tetrahydrofuran 0.00125 6.1E-04 7.6E-07 3.1E-07 7.3E-07 6.2E-10 2.4E-06V-B1-V1-5 5 Toluene 0.0016 5.3E-04 8.5E-07 3.5E-07 8.1E-07 NC 2.7E-06 9.9E-08 9.8E-04V-B1-V1-15 15 1,2,4-Trimethylbenzene 0.0038 1.4E-04 5.3E-07 2.2E-07 5.0E-07 NC 7.2E-05V-B1-V1-15 15 1,3,5-Trimethylbenzene 0.0019 1.4E-04 2.6E-07 1.1E-07 2.5E-07 NC 4.2E-05V-B1-V1-15 15 1,3-Butadiene 0.00085 4.8E-04 4.1E-07 1.7E-07 3.9E-07 2.9E-08 2.0E-04V-B1-V1-15 15 2-Butanone (Methyl Ethyl Ketone) 0.00455 1.9E-04 8.4E-07 3.5E-07 8.1E-07 NC 1.6E-07V-B1-V1-15 15 4-Ethyltoluene 0.0019 1.5E-04 2.9E-07 1.2E-07 2.8E-07 NC 2.8E-06V-B1-V1-15 15 4-Methyl-2-pentanone 0.0016 1.7E-04 2.7E-07 1.1E-07 2.6E-07 NC 8.7E-08V-B1-V1-15 15 Acetone 0.010 2.7E-04 2.7E-06 1.1E-06 2.6E-06 NC 8.5E-08V-B1-V1-15 15 Benzene 0.00125 2.0E-04 2.4E-07 1.0E-07 2.3E-07 2.9E-09 7.8E-06V-B1-V1-15 15 Carbon Disulfide 0.0048 2.3E-04 1.1E-06 4.5E-07 1.0E-06 NC 1.5E-06V-B1-V1-15 15 Chloroform 0.0019 2.3E-04 4.3E-07 1.8E-07 4.2E-07 9.4E-10 1.4E-06V-B1-V1-15 15 Ethanol 0.0029 3.2E-04 9.3E-07 3.8E-07 8.9E-07 NC 1.3E-07V-B1-V1-15 15 Ethyl Benzene 0.0017 1.7E-04 2.9E-07 1.2E-07 2.8E-07 2.9E-10 2.8E-07V-B1-V1-15 15 Freon 11 0.0022 1.9E-04 4.3E-07 1.8E-07 4.1E-07 NC 5.8E-07V-B1-V1-15 15 Freon 12 0.0019 1.5E-04 2.9E-07 1.2E-07 2.7E-07 NC 1.4E-06V-B1-V1-15 15 m,p-Xylene 0.0054 1.6E-04 8.5E-07 3.5E-07 8.2E-07 NC 8.2E-06V-B1-V1-15 15 o-Xylene 0.0017 1.9E-04 3.3E-07 1.4E-07 3.2E-07 NC 3.2E-06V-B1-V1-15 15 Propylbenzene 0.0019 1.4E-04 2.6E-07 1.1E-07 2.5E-07 NC 1.8E-06V-B1-V1-15 15 Tetrachloroethene 0.0026 1.6E-04 4.2E-07 1.7E-07 4.1E-07 1.0E-09 1.2E-05V-B1-V1-15 15 Tetrahydrofuran 0.00115 2.3E-04 2.6E-07 1.1E-07 2.5E-07 2.1E-10 8.4E-07V-B1-V1-15 15 Toluene 0.00145 1.9E-04 2.8E-07 1.2E-07 2.7E-07 NC 9.0E-07 3.4E-08 3.5E-04


SampleID

Sampling Depth



(mg/m3)b

Attenuation Factor

[(mg/m3)/(mg/m3)]c


(EPC) in Indoor Air

(mg/m3)d


Effects (mg/m3)e






Cumulative Cancer

Risk


Hazard






SampleID

Sampling Depth



(mg/m3)b

Attenuation Factor

[(mg/m3)/(mg/m3)]c


(EPC) in Indoor Air

(mg/m3)d


Effects (mg/m3)e






Cumulative Cancer

Risk


Hazard




V-C1-V1-5 5 1,2,4-Trimethylbenzene 0.026 4.0E-04 1.0E-05 4.2E-06 9.9E-06 NC 1.4E-03V-C1-V1-5 5 1,3,5-Trimethylbenzene 0.0091 3.9E-04 3.6E-06 1.5E-06 3.4E-06 NC 5.8E-04V-C1-V1-5 5 1,3-Butadiene 0.00090 1.1E-03 9.8E-07 4.0E-07 9.4E-07 6.8E-08 4.7E-04V-C1-V1-5 5 2-Butanone (Methyl Ethyl Ketone) 0.00485 5.1E-04 2.5E-06 1.0E-06 2.4E-06 NC 4.8E-07V-C1-V1-5 5 4-Ethyltoluene 0.019 4.4E-04 8.3E-06 3.4E-06 7.9E-06 NC 7.9E-05V-C1-V1-5 5 4-Methyl-2-pentanone 0.0017 4.8E-04 8.1E-07 3.3E-07 7.7E-07 NC 2.6E-07V-C1-V1-5 5 Acetone 0.011 7.1E-04 7.8E-06 3.2E-06 7.5E-06 NC 2.4E-07V-C1-V1-5 5 Benzene 0.0013 5.4E-04 7.0E-07 2.9E-07 6.7E-07 8.3E-09 2.2E-05V-C1-V1-5 5 Carbon Disulfide 0.015 6.1E-04 9.1E-06 3.8E-06 8.8E-06 NC 1.3E-05V-C1-V1-5 5 Chloroform 0.075 6.1E-04 4.6E-05 1.9E-05 4.4E-05 1.0E-07 1.5E-04V-C1-V1-5 5 Ethanol 0.0031 8.0E-04 2.5E-06 1.0E-06 2.4E-06 NC 3.4E-07V-C1-V1-5 5 Ethyl Benzene 0.011 4.7E-04 5.2E-06 2.1E-06 5.0E-06 5.3E-09 5.0E-06V-C1-V1-5 5 Freon 11 0.0023 5.3E-04 1.2E-06 5.0E-07 1.2E-06 NC 1.7E-06V-C1-V1-5 5 Freon 12 0.00205 4.3E-04 8.8E-07 3.6E-07 8.4E-07 NC 4.2E-06V-C1-V1-5 5 m,p-Xylene 0.046 4.5E-04 2.1E-05 8.4E-06 2.0E-05 NC 2.0E-04V-C1-V1-5 5 o-Xylene 0.015 5.3E-04 8.0E-06 3.3E-06 7.6E-06 NC 7.6E-05V-C1-V1-5 5 Propylbenzene 0.0020 3.9E-04 7.9E-07 3.2E-07 7.5E-07 NC 5.4E-06V-C1-V1-5 5 Tetrachloroethene 0.012 4.6E-04 5.5E-06 2.3E-06 5.3E-06 1.3E-08 1.5E-04V-C1-V1-5 5 Tetrahydrofuran 0.0012 6.1E-04 7.3E-07 3.0E-07 7.0E-07 6.0E-10 2.3E-06V-C1-V1-5 5 Toluene 0.028 5.3E-04 1.5E-05 6.1E-06 1.4E-05 NC 4.8E-05 2.0E-07 3.2E-03V-C1-V1-15 15 1,2,4-Trimethylbenzene 0.00195 1.4E-04 2.7E-07 1.1E-07 2.6E-07 NC 3.7E-05V-C1-V1-15 15 1,3,5-Trimethylbenzene 0.00195 1.4E-04 2.7E-07 1.1E-07 2.6E-07 NC 4.3E-05V-C1-V1-15 15 1,3-Butadiene 0.00085 4.8E-04 4.1E-07 1.7E-07 3.9E-07 2.9E-08 2.0E-04V-C1-V1-15 15 2-Butanone (Methyl Ethyl Ketone) 0.00465 1.9E-04 8.6E-07 3.5E-07 8.3E-07 NC 1.7E-07V-C1-V1-15 15 4-Ethyltoluene 0.00195 1.5E-04 3.0E-07 1.2E-07 2.9E-07 NC 2.9E-06V-C1-V1-15 15 4-Methyl-2-pentanone 0.0016 1.7E-04 2.7E-07 1.1E-07 2.6E-07 NC 8.7E-08V-C1-V1-15 15 Acetone 0.0095 2.7E-04 2.6E-06 1.1E-06 2.5E-06 NC 8.0E-08V-C1-V1-15 15 Benzene 0.00125 2.0E-04 2.4E-07 1.0E-07 2.3E-07 2.9E-09 7.8E-06V-C1-V1-15 15 Carbon Disulfide 0.0049 2.3E-04 1.1E-06 4.6E-07 1.1E-06 NC 1.5E-06V-C1-V1-15 15 Chloroform 0.0019 2.3E-04 4.3E-07 1.8E-07 4.2E-07 9.4E-10 1.4E-06V-C1-V1-15 15 Ethanol 0.010 3.2E-04 3.2E-06 1.3E-06 3.1E-06 NC 4.4E-07V-C1-V1-15 15 Ethyl Benzene 0.0017 1.7E-04 2.9E-07 1.2E-07 2.8E-07 2.9E-10 2.8E-07V-C1-V1-15 15 Freon 11 0.0022 1.9E-04 4.3E-07 1.8E-07 4.1E-07 NC 5.8E-07V-C1-V1-15 15 Freon 12 0.0041 1.5E-04 6.2E-07 2.5E-07 5.9E-07 NC 3.0E-06V-C1-V1-15 15 m,p-Xylene 0.0017 1.6E-04 2.7E-07 1.1E-07 2.6E-07 NC 2.6E-06V-C1-V1-15 15 o-Xylene 0.0017 1.9E-04 3.3E-07 1.4E-07 3.2E-07 NC 3.2E-06V-C1-V1-15 15 Propylbenzene 0.00195 1.4E-04 2.7E-07 1.1E-07 2.6E-07 NC 1.8E-06V-C1-V1-15 15 Tetrachloroethene 0.014 1.6E-04 2.3E-06 9.3E-07 2.2E-06 5.5E-09 6.2E-05V-C1-V1-15 15 Tetrahydrofuran 0.00115 2.3E-04 2.6E-07 1.1E-07 2.5E-07 2.1E-10 8.4E-07V-C1-V1-15 15 Toluene 0.0015 1.9E-04 2.9E-07 1.2E-07 2.8E-07 NC 9.3E-07 3.9E-08 3.7E-04


SampleID

Sampling Depth



(mg/m3)b

Attenuation Factor

[(mg/m3)/(mg/m3)]c


(EPC) in Indoor Air

(mg/m3)d


Effects (mg/m3)e






Cumulative Cancer

Risk


Hazard






SampleID

Sampling Depth



(mg/m3)b

Attenuation Factor

[(mg/m3)/(mg/m3)]c


(EPC) in Indoor Air

(mg/m3)d


Effects (mg/m3)e






Cumulative Cancer

Risk


Hazard




V-C5-V1-5 5 1,2,4-Trimethylbenzene 0.0020 4.0E-04 7.9E-07 3.3E-07 7.6E-07 NC 1.1E-04V-C5-V1-5 5 1,3,5-Trimethylbenzene 0.0020 3.9E-04 7.9E-07 3.2E-07 7.6E-07 NC 1.3E-04V-C5-V1-5 5 1,3-Butadiene 0.00090 1.1E-03 9.8E-07 4.0E-07 9.4E-07 6.8E-08 4.7E-04V-C5-V1-5 5 2-Butanone (Methyl Ethyl Ketone) 0.00475 5.1E-04 2.4E-06 1.0E-06 2.3E-06 NC 4.7E-07V-C5-V1-5 5 4-Ethyltoluene 0.0020 4.4E-04 8.7E-07 3.6E-07 8.4E-07 NC 8.4E-06V-C5-V1-5 5 4-Methyl-2-pentanone 0.00165 4.8E-04 7.8E-07 3.2E-07 7.5E-07 NC 2.5E-07V-C5-V1-5 5 Acetone 0.011 7.1E-04 7.8E-06 3.2E-06 7.5E-06 NC 2.4E-07V-C5-V1-5 5 Benzene 0.0013 5.4E-04 7.0E-07 2.9E-07 6.7E-07 8.3E-09 2.2E-05V-C5-V1-5 5 Carbon Disulfide 0.0050 6.1E-04 3.0E-06 1.3E-06 2.9E-06 NC 4.2E-06V-C5-V1-5 5 Chloroform 0.00195 6.1E-04 1.2E-06 4.9E-07 1.1E-06 2.6E-09 3.8E-06V-C5-V1-5 5 Ethanol 0.00305 8.0E-04 2.4E-06 1.0E-06 2.3E-06 NC 3.3E-07V-C5-V1-5 5 Ethyl Benzene 0.00175 4.7E-04 8.3E-07 3.4E-07 7.9E-07 8.5E-10 7.9E-07V-C5-V1-5 5 Freon 11 0.00225 5.3E-04 1.2E-06 4.9E-07 1.1E-06 NC 1.6E-06V-C5-V1-5 5 Freon 12 0.0020 4.3E-04 8.6E-07 3.5E-07 8.2E-07 NC 4.1E-06V-C5-V1-5 5 m,p-Xylene 0.00175 4.5E-04 7.8E-07 3.2E-07 7.5E-07 NC 7.5E-06V-C5-V1-5 5 o-Xylene 0.00175 5.3E-04 9.3E-07 3.8E-07 8.9E-07 NC 8.9E-06V-C5-V1-5 5 Propylbenzene 0.0020 3.9E-04 7.9E-07 3.2E-07 7.5E-07 NC 5.4E-06V-C5-V1-5 5 Tetrachloroethene 0.0056 4.6E-04 2.6E-06 1.1E-06 2.5E-06 6.2E-09 7.0E-05V-C5-V1-5 5 Tetrahydrofuran 0.0012 6.1E-04 7.3E-07 3.0E-07 7.0E-07 6.0E-10 2.3E-06V-C5-V1-5 5 Toluene 0.0015 5.3E-04 8.0E-07 3.3E-07 7.6E-07 NC 2.5E-06 8.7E-08 8.5E-04

Notes:bgs = below ground surfaceNC = Not considered to be a carcinogen.mg/m3 = micrograms per cubic meter

f Incremental cancer risks and noncancer hazard quotients were calculated using equations presented in Table 4-4 and exposure parameters presented in Table 4-3.

a All locations and depths are included.b Measured chemical concentration in soil gas. Detected results are presented in bold. Non-detect results are represented by one-half the laboratory reporting limit; non-detect results are included if the chemical was detected in at least one site soil gas sample. c The attenuation factor represents the relationship between the chemical concentration in soil gas and the chemical concentration in indoor air (resulting from volatilization from soil gas, i.e. , vapor intrusion). The methodology used in the calculation of attenuation factors is presented in Appendix N. d The exposure point concentration (EPC) in indoor air is the actual concentration of chemical in air the receptor is exposed to while in indoors. e The exposure concentrations (ECs) are analagous to chronic daily intakes (CDIs).


SampleID

Sampling Depth



(mg/m3)b

Transfer Factor

[(mg/m3)/(mg/m3)]c


(EPC) in Outdoor Air

(mg/m3)d

Exposure Concentration

(EC) in Outdoor Air – Cancer

Effects (mg/m3)e

Exposure Concentration (EC)

in Outdoor Air – Noncancer Effects

(mg/m3)e

Incremental Cancer Risk in

Outdoor Air (unitless)f

Noncancer Hazard

Quotient in Outdoor Air (unitless)f

Cumulative Cancer Risk


Hazard V-A1-V1-5 5 1,2,4-Trimethylbenzene 0.0019 2.4E-06 4.5E-09 1.8E-09 4.3E-09 NC 6.1E-07V-A1-V1-5 5 1,3,5-Trimethylbenzene 0.0019 2.3E-06 4.4E-09 1.8E-09 4.3E-09 NC 7.2E-07V-A1-V1-5 5 1,3-Butadiene 0.00085 9.7E-06 8.2E-09 3.4E-09 7.9E-09 5.7E-10 3.9E-06V-A1-V1-5 5 2-Butanone (Methyl Ethyl Ketone) 0.0046 3.2E-06 1.5E-08 6.1E-09 1.4E-08 NC 2.8E-09V-A1-V1-5 5 4-Ethyltoluene 0.0019 2.6E-06 5.0E-09 2.1E-09 4.8E-09 NC 4.8E-08V-A1-V1-5 5 4-Methyl-2-pentanone 0.0016 2.9E-06 4.7E-09 1.9E-09 4.5E-09 NC 1.5E-09V-A1-V1-5 5 Acetone 0.0037 5.0E-06 1.8E-08 7.5E-09 1.8E-08 NC 5.7E-10V-A1-V1-5 5 Benzene 0.00125 3.4E-06 4.3E-09 1.8E-09 4.1E-09 5.1E-11 1.4E-07V-A1-V1-5 5 Carbon Disulfide 0.0049 4.0E-06 2.0E-08 8.1E-09 1.9E-08 NC 2.7E-08V-A1-V1-5 5 Chloroform 0.0019 4.0E-06 7.7E-09 3.2E-09 7.4E-09 1.7E-11 2.5E-08V-A1-V1-5 5 Ethanol 0.00295 5.9E-06 1.7E-08 7.2E-09 1.7E-08 NC 2.4E-09V-A1-V1-5 5 Ethyl Benzene 0.0017 2.9E-06 5.0E-09 2.0E-09 4.8E-09 5.1E-12 4.8E-09V-A1-V1-5 5 Freon 11 0.0022 3.4E-06 7.4E-09 3.1E-09 7.1E-09 NC 1.0E-08V-A1-V1-5 5 Freon 12 0.00195 2.6E-06 5.0E-09 2.1E-09 4.8E-09 NC 2.4E-08V-A1-V1-5 5 m,p-Xylene 0.0017 2.7E-06 4.6E-09 1.9E-09 4.4E-09 NC 4.4E-08V-A1-V1-5 5 o-Xylene 0.0017 3.4E-06 5.7E-09 2.4E-09 5.5E-09 NC 5.5E-08V-A1-V1-5 5 Propylbenzene 0.0019 2.3E-06 4.4E-09 1.8E-09 4.3E-09 NC 3.0E-08V-A1-V1-5 5 Tetrachloroethene 0.00265 2.8E-06 7.4E-09 3.0E-09 7.1E-09 1.8E-11 2.0E-07V-A1-V1-5 5 Tetrahydrofuran 0.00115 4.0E-06 4.6E-09 1.9E-09 4.4E-09 3.8E-12 1.5E-08V-A1-V1-5 5 Toluene 0.0015 3.4E-06 5.1E-09 2.1E-09 4.9E-09 NC 1.6E-08 6.7E-10 5.9E-06V-A1-V1-15 15 1,2,4-Trimethylbenzene 0.00195 7.9E-07 1.5E-09 6.3E-10 1.5E-09 NC 2.1E-07V-A1-V1-15 15 1,3,5-Trimethylbenzene 0.00195 7.8E-07 1.5E-09 6.3E-10 1.5E-09 NC 2.5E-07V-A1-V1-15 15 1,3-Butadiene 0.00090 3.2E-06 2.9E-09 1.2E-09 2.8E-09 2.0E-10 1.4E-06V-A1-V1-15 15 2-Butanone (Methyl Ethyl Ketone) 0.0047 1.1E-06 5.0E-09 2.1E-09 4.8E-09 NC 9.7E-10V-A1-V1-15 15 4-Ethyltoluene 0.00195 8.8E-07 1.7E-09 7.1E-10 1.6E-09 NC 1.6E-08V-A1-V1-15 15 4-Methyl-2-pentanone 0.00165 9.8E-07 1.6E-09 6.6E-10 1.6E-09 NC 5.2E-10V-A1-V1-15 15 Acetone 0.0075 1.7E-06 1.2E-08 5.1E-09 1.2E-08 NC 3.8E-10V-A1-V1-15 15 Benzene 0.0013 1.1E-06 1.5E-09 6.1E-10 1.4E-09 1.8E-11 4.7E-08V-A1-V1-15 15 Carbon Disulfide 0.0050 1.3E-06 6.7E-09 2.8E-09 6.5E-09 NC 9.2E-09V-A1-V1-15 15 Chloroform 0.00195 1.3E-06 2.6E-09 1.1E-09 2.5E-09 5.7E-12 8.4E-09V-A1-V1-15 15 Ethanol 0.0030 2.0E-06 5.9E-09 2.4E-09 5.7E-09 NC 8.1E-10V-A1-V1-15 15 Ethyl Benzene 0.00175 9.7E-07 1.7E-09 7.0E-10 1.6E-09 1.7E-12 1.6E-09V-A1-V1-15 15 Freon 11 0.00225 1.1E-06 2.5E-09 1.0E-09 2.4E-09 NC 3.5E-09V-A1-V1-15 15 Freon 12 0.0043 8.6E-07 3.7E-09 1.5E-09 3.6E-09 NC 1.8E-08V-A1-V1-15 15 m,p-Xylene 0.00175 9.1E-07 1.6E-09 6.5E-10 1.5E-09 NC 1.5E-08V-A1-V1-15 15 o-Xylene 0.00175 1.1E-06 2.0E-09 8.1E-10 1.9E-09 NC 1.9E-08V-A1-V1-15 15 Propylbenzene 0.00195 7.8E-07 1.5E-09 6.2E-10 1.5E-09 NC 1.0E-08V-A1-V1-15 15 Tetrachloroethene 0.026 9.3E-07 2.4E-08 1.0E-08 2.3E-08 5.9E-11 6.6E-07V-A1-V1-15 15 Tetrahydrofuran 0.0012 1.3E-06 1.6E-09 6.6E-10 1.5E-09 1.3E-12 5.2E-09V-A1-V1-15 15 Toluene 0.0015 1.1E-06 1.7E-09 6.9E-10 1.6E-09 NC 5.4E-09 2.9E-10 2.7E-06

TABLE 4-19OUTDOOR AIR INHALATION CANCER RISKS AND NONCANCER HAZARD INDICES FOR VOCS IN SOIL GAS:




SampleID

Sampling Depth



(mg/m3)b

Transfer Factor

[(mg/m3)/(mg/m3)]c



(mg/m3)d



Effects (mg/m3)e



(mg/m3)e



Noncancer Hazard




Hazard






SampleID

Sampling Depth



(mg/m3)b

Transfer Factor

[(mg/m3)/(mg/m3)]c



(mg/m3)d



Effects (mg/m3)e



(mg/m3)e



Noncancer Hazard




Hazard




V-C5-V1-5 5 1,2,4-Trimethylbenzene 0.0020 2.4E-06 4.7E-09 1.9E-09 4.5E-09 NC 6.5E-07V-C5-V1-5 5 1,3,5-Trimethylbenzene 0.0020 2.3E-06 4.7E-09 1.9E-09 4.5E-09 NC 7.5E-07V-C5-V1-5 5 1,3-Butadiene 0.00090 9.7E-06 8.7E-09 3.6E-09 8.4E-09 6.1E-10 4.2E-06V-C5-V1-5 5 2-Butanone (Methyl Ethyl Ketone) 0.00475 3.2E-06 1.5E-08 6.3E-09 1.5E-08 NC 2.9E-09V-C5-V1-5 5 4-Ethyltoluene 0.0020 2.6E-06 5.3E-09 2.2E-09 5.1E-09 NC 5.1E-08V-C5-V1-5 5 4-Methyl-2-pentanone 0.00165 2.9E-06 4.9E-09 2.0E-09 4.7E-09 NC 1.6E-09V-C5-V1-5 5 Acetone 0.011 5.0E-06 5.5E-08 2.2E-08 5.2E-08 NC 1.7E-09V-C5-V1-5 5 Benzene 0.0013 3.4E-06 4.4E-09 1.8E-09 4.3E-09 5.3E-11 1.4E-07V-C5-V1-5 5 Carbon Disulfide 0.0050 4.0E-06 2.0E-08 8.3E-09 1.9E-08 NC 2.8E-08V-C5-V1-5 5 Chloroform 0.00195 4.0E-06 7.9E-09 3.2E-09 7.6E-09 1.7E-11 2.5E-08V-C5-V1-5 5 Ethanol 0.00305 5.9E-06 1.8E-08 7.4E-09 1.7E-08 NC 2.5E-09V-C5-V1-5 5 Ethyl Benzene 0.00175 2.9E-06 5.1E-09 2.1E-09 4.9E-09 5.2E-12 4.9E-09V-C5-V1-5 5 Freon 11 0.00225 3.4E-06 7.6E-09 3.1E-09 7.3E-09 NC 1.0E-08V-C5-V1-5 5 Freon 12 0.0020 2.6E-06 5.2E-09 2.1E-09 5.0E-09 NC 2.5E-08V-C5-V1-5 5 m,p-Xylene 0.00175 2.7E-06 4.8E-09 2.0E-09 4.6E-09 NC 4.6E-08V-C5-V1-5 5 o-Xylene 0.00175 3.4E-06 5.9E-09 2.4E-09 5.7E-09 NC 5.7E-08V-C5-V1-5 5 Propylbenzene 0.0020 2.3E-06 4.7E-09 1.9E-09 4.5E-09 NC 3.2E-08V-C5-V1-5 5 Tetrachloroethene 0.0056 2.8E-06 1.6E-08 6.4E-09 1.5E-08 3.8E-11 4.3E-07V-C5-V1-5 5 Tetrahydrofuran 0.0012 4.0E-06 4.8E-09 2.0E-09 4.6E-09 4.0E-12 1.5E-08V-C5-V1-5 5 Toluene 0.0015 3.4E-06 5.1E-09 2.1E-09 4.9E-09 NC 1.6E-08 7.3E-10 6.5E-06Site-wide Average 8.6E-10 8.8E-06

Notes:bgs = below ground surfaceNC = Not considered to be a carcinogen.mg/m3 = micrograms per cubic meter

f Incremental cancer risks and noncancer hazard quotients were calculated using equations presented in Table 4-4 and exposure parameters presented in Table 4-3.

a All locations and depths are included.b Measured chemical concentration in soil gas. Detected results are presented in bold. Non-detect results are represented by one-half the laboratory reporting limit; non-detect results are included if the chemical was detected in at least one site soil gas sample. In the case of non-detect results in both duplicate and primary samples, one-half of the lower of the two detection limits was evaluated.c The transfer factor represents the relationship between the chemical concentration in soil gas and the chemical concentration in outdoor air (resulting from volatilization from soil gas into outdoor air). The methodology used in the calculation of transfer factors is presented in Appendix N. d The exposure point concentration (EPC) in outdoor air is the actual concentration the receptor is exposed to while in outdoor air. e The exposure concentrations (ECs) are analagous to chronic daily intakes (CDIs).



Figures


Appendices All Appendices are Provided on Compact Disk

Appendix A Correspondence

Appendix B Permits

Appendix C Abandonment of Monitoring Wells

Appendix D Site Demolition Weighmaster Certificates and Asbestos Survey

Appendix E Waste Manifests and Weighmaster Certificates – Exported Soil

Appendix F Weighmaster Certificates - Imported Soil

Appendix G Compaction Test Reports

Appendix H Weighmaster Certificates – Imported Aggregate

Appendix I Import Slurry Tickets

Appendix J Analytical Laboratory Reports

Appendix K Quality Assurance Summary Report

Appendix L Geotechnical Soil Sample Results

Appendix M Data Statistical Evaluation

Appendix N Modeling Methodologies

Appendix O Uncertainties in the Risk Assessment


Volume II - Appendices Appendix A Correspondence Appendix B Permits Appendix C Abandonment of Monitoring Wells Appendix D Site Demolition Weighmaster Certifications and Asbestos Survey Appendix E Waste Manifest and Weighmaster Certificates – Exported Soil Appendix F Weighmaster Certificates – Imported Soil Appendix G Compaction Test Reports Appendix H Weighmaster Certificates – Imported Aggregate Appendix I Import Slurry Tickets Appendix J Analytical Laboratory Reports Appendix K Quality Assurance Summary Report Appendix L Geotechnical Soil Sample Results Appendix M Data Statistical Evaluation Appendix N Modeling Methodologies Appendix O Uncertainties in the Risk Assessment


Appendix A

Correspondence

The Department of Toxic Substances Control (DTSC) is issuing the community about an opportunity to review and comment on a(called a draft Removal Action Workplan or draft RAW) for PCompany’s (PG&E) former manufactured gas plant site (referredthe site

this fact sheet to inform proposed cleanup plan acific Gas and Electric to in this fact sheet as

) located at 9th Street and South E Street, in Madera, California. The site is currently used by PG&E as an open space storage facility and as a mobilization yard for field crews. PG&E is cleaning up this site voluntarily as part of a company-wide program to address impacts from historic operations at various sites throughout its service territory.

Current photo of Madera Yard from Clinton Street

Fact Sheet, February 2011 Soil Cleanup Plan Available for Public Comment

r Madera Manufactured Gas Plant Sitefor FormeMadera, California

Public Comment Period February 7 to March 8, 2011

DTSC invites interested members of the public to review and comment on the proposed cl al Action Workplan (RAW) for the former Madera manufactu ring a 30-day public comment period beginning February 7, 20 , 2011. The draft RAW describes the previous investigations and the proposed cleanup activities for the site. The draft RAW and other site-related documents are available for review at the information repositories listed on page 4 of this fact sheet or online at

eanup plan, called a draft Removred gas plant site du

11 and ending March 8

www.envirostor.dtsc.ca.gov/public.

All written and emailed comments must be submitted by March 8, 2011. A self addressed stamped postcard is enclosed to submit your comments. Please submit your comments to:

Kevin Shaddy – DTSC Project Manager

1515 Tollhouse Road Clovis, CA 93611-0522

Office Phone: (559) 297-3929 [email protected]

Site Description and HistoryThe site is about one acre in scurrently used by PG&E as an storage facility and as a mobilizatiPG&E field crews. The site is paved with asphalt, enclosed with

izoponco a

ins int

facnt

, cooking and heatits. The plant was di

nov

ese investigations have iden

pounds sen

an Health Risk Assessment (HRA) was conducted to determine if chemicals present in the soil and soil gas pose a risk to human health or the environment. The HRA determined that the chemicals detected in the soil and soil gas at the site do not pose a significant risk to current on-site commercial workers, on-site and off-site workers who may occasionally work in or handle the soil, or off-site residential and commercial populations.

e and is en space yard for mpletely six-foot

high cyclone fence, and contastorage building adjacent to the Clentrance.

From 1913 to about 1931 a manuplant operated at the site. This plagas for the lighting

a small on Street

tured gas produced ng needs smantled Madera, ed from

of local residenwhen natural gas became available iand the MGP structures were remthe site from 1931 to 1935.

Site Investigations Since 1986, several phases investigations have been conducteto determine if manufactured residues are present in soil, soil gabetween soil particles) and gTh

of site d at the site

gas plant s (the air in roundwater.

tified varying drocarbons ons (TPHs) oil ranges,

(VOCs), and ic, in soils and

een 1 to 10

at a depth mples of

levels of polycyclic aromatic hy(PAHs), total petroleum hydrocarbin the gasoline, diesel, and crudevolatile organic commetals, including lead and arsoil gas at depths primarily betwfeet.

Groundwater beneath the site occursof approximately 105 feet. Sagroundwater beneath the site ingroundwater has not been impacteof the former MGP operations.

Human Health Risk Assessme

dicate that d as a result

nt

Although the HRA cothe chemicals detectesignificant risk to pcurrent site uses, the sthe future. In order tocondition that wouldfuture land

ncluded that none of d at the site pose a opulations under the ite use may change in restore the site to a

be protective of all uses, including development of

residential uses, some form ecessary.

ves Evaluated draft RAW is to uate the nature and site and to identify a oach that prevents or

reduces potential risks to public health and nup alternatives were

evaluated based on a variety of factors ss, ability to be d public acceptance,

ves were evaluated for

his alternative was ide a baseline against

p alternatives can be alternative would

p actions and the site current condition.

itutional Controls - ould involve placing an asphalt or concrete site, without any soil

oil removal. A deed e placed on the site in

cap and to prohibit ctivities which could

trate the cap. This events exposure to site

users, minimizes the disturbance of impacted soil and minimizes dust, and reduces water infiltration. The volume and concentrations of contaminants would not be reduced under this option.

3. Excavation and Offsite Treatment - This alternative would involve excavating the contaminated soil with standard earthmoving equipment. The excavated soil would be transported off-site for treatment (thermal desorption

the site for future of soil cleanup will be n

Cleanup AlternatiThe purpose of thesummarize and evalextent of impacts at thepreferred cleanup appr

the environment. Clea

including effectiveneimplemented, state anand cost.

Four cleanup alternatithe site:

1. No Action - Tevaluated to provwhich other cleanucompared. This involve no cleanuwould remain in its

2. Capping and InstThis alternative wand/or maintainingcap over the entire treatment or srestriction would border to maintain thesensitive uses or adamage or penealternative pr

A Hum

2

treatment/recycling). The excawould be backfilled with clean site would be restored. The over

vated area fill and the all volume ants would and concentrations of contamin

be reduced under this option.

4. Excavation and Offsite Disposaalternative includes excavcontaminated soil with earthmoving equipment and bthe excavated areas with cleanexcavated soil would be transpsite for disposal at a

l - This ation of

s ndard tackfilling

The a fill.or

n appropritmen

lum ts onion.

rnatihen and soil hte

offend

conta

nearit

g and inst a

pern

derground utilityrg

phal areas of the site;

Phased removal of approximately 5,600 tons (approximately 280 truckloads) of soil and asphalt from depths ranging between 2 and 10 feet;

Placement of excavated soil in a truck and/or bin for off-site disposal;

Confirmation sampling to determine that the excavation has removed impacted soil;

Backfill and compaction of excavated areas with clean, imported soil (approximately 330 truckloads);

ted off-ately

permitted facility with no trea t and/or e and

-site

ve

recycling of soil. The voconcentrations of contaminanwould be reduced under this opt

Recommended Cleanup AlteBased on a complete evaluation of talternatives, Alternative 4, excavatiosite disposal of PAH contaminatedwithin the fenced in area of the site,identified as the proposed cleanup alThe proposed cleanup alternative

cleanup off-from

as been rnative. rs long- can be ingency t cannot utilities

access,

term protection of the community areadily implemented. As a measure, if there is impacted soil thbe removed because it is located or other structures that limAlternative 2, cappin itutional controls will be implemented in those

The following activities would be under th

reas.

rformed ative:

survey to round

t paving

e recommended cleanup alte

Performing an unidentify all piping and other undefeatures;

Removal and demolition of aswithin nine

Restoration of acleanup

ll removed paving; and and restoration of all related

reas.

ing project controls protect the surrounding

implemented during activities:

nd site-specific health ll be prepared to guide all

ntal project manager will be onitor and approve all

g will be conducted n activities and

tivities will be performed e size of excavated areas and minimizing g water onto soil and

g all work on windy days, covering all trucks

ing the site; and from construction

g working only during city and keeping noise wed decibel levels.

California Environmental Quality Act – Notice of Exemption

h the California Act, DTSC has of Exemption (NOE) ft NOE states that the not have significant

Before DTSC makes a final decision to approve, modify, or deny the draft RAW, it is made available for public comment during a 30-day public comment period from February 7 to March 8, 2011. After the close of the public comment period, DTSC will prepare a Response to Comments document. DTSC will consider all of the comments that were received during the comment period prior to making a final decision on the draft RAW.

3

structures and work a

In addition, the followdesigned to community will be cleanup and containment

A remedial design aand safety plan wiremediation work;

An environmeon-site daily to mwork;

Airborne dust monitorinduring all excavatiothroughout the daytime work schedule;

Dust suppression acincluding limiting thfor easy managementexposed soil, sprayinwork areas, stoppincovering soil piles, andleav

Measures to limit noisewill be taken includinhours allowed by thelevels below city-allo

In compliance witEnvironmental Qualityprepared a draft Notice for this project. The draproposed cleanup will impacts on the environment.

Next Steps

The Response to Comments documplaced in the inf

eormation reposito

ork es will likely d be

.,

95/ South n Highw

nt

Site Document

E, and other site-related d available at the in

brary – Refe36

93tm

Hours: 8:00 a.m. - 5:00 p.m. M-F

he lab

alternate format (i.e. Braille, large ps approp

accordance with state and federal law. Please contact Christina Fu for assistance as noted in

EnviroStor Database: Copies of key technical reports, fact sheets, and other site-related information are available online at DTSC’s website: http://www.envirostor.dtsc.ca.gov

nt will be ries that

plan will

have been set up for the site.

If the draft RAW is approved, a wbe prepared to guide all soilactivities. Soil excavation activitiebegin in late-2011 and are expecteto three months. Work will occur hours of 7:00 a.m. and 5:00 p.mthrough Friday. Trucks transportingthe site are expected to exit on to

xcavation

to last up tween the Monday soil from th Street

east to Highway CA-14Drive and turn left o

Gateway ay CA-

145/Madera Avenue and conorthbound Highway 99.

Where to Find

inue to

s the draft ocuments

DTSC encourages you to reviewRAW, NOwhich arerepositories listed below:

Madera County Main Li

formation

rence Desk 121 North G Street, Madera, CA 9(559) 675-7871

DTSC File Room, 1515 Tollhouse Road, Clovis, CA (559) 297-3901 Call for an appoin

37

For More Information For more information about the draft cleanup plan or to be added to the site mailing list please contact the following DTSC representatives:

uestions about the cleanup, please contact:

addy, ject Manager

2 [email protected]

For q

Kevin ShDTSC Pro1515 Tollhouse Road Clovis, CA 93611-052Email: Office Phone: (559) 297-3929

uestions regarding the public participation ss, please contact:

Fu,

nue Cypress, CA 90630

dtsc.ca.gov

For qproce

Christina DTSC Public Participation Specialist 5796 Corporate Ave

Email: cfu@ -Free: (866) 495-5651 (press 4 twice)

one: (714) 484-5488

For media related inquiries, please contact:

venue 11 .ca.gov

TollOffice Ph

611 ent

public by le in an rint, etc.) riate, in

Jeanne Garcia, DTSC Public Information Officer 9211 Oakdale AChatsworth, CA 913Email: jgarcia1@dtsc

All documents made available to tthe DTSC can be made avai

or in another language a

the “For More Information” section.

/public

717-6573

Notice to the Hearing Impaired

mation about the site by using the California State Relay Service (800) 735-2929 to reach the Public Participation Specialist. Ask them to contact Christina Fu at (714) 484-5488 regarding the PG&E Former Madera MGP site in Madera, California.

4

Office Phone: (818)

Telecommunications Device for the Deaf (TDD) users can obtain infor

For more information about DTSC, please visit our Web site at www.envirostor.dtsc.ca.gov/public.

mailto:[email protected]

mailto:[email protected]

NOTICE OF PUBLIC COMMENT PERIOD FOR Draft Removal Action Workplan

Former Madera Manufactured Gas Plant Site 9th and South E Streets, Madera California

February 7, 2011 to March 8, 2011

The Department of Toxic Substances Control (DTSC) announces a 30‐day public comment period on a draft Removal Action Workplan (draft RAW) prepared by Pacific Gas and Electric Company (PG&E) for a property located at 9th Street and South E Street in Madera, California. This property (the site) operated as a manufactured gas plant from 1913 to 1931 and is currently used by PG&E as a storage yard. Environmental investigations found elevated concentrations of polycyclic aromatic hydrocarbons (PAHs), total petroleum hydrocarbons (TPHs), volatile organic compounds (VOCs), and metals including lead and arsenic in site soils and soil gas mostly at depths of one to 10 feet. PG&E is proposing to excavate the contaminated soil from the project area to allow for unrestricted use, dispose of this soil at a permitted off‐site facility, and backfill the excavation with clean soil. The selected remedy would allow continued use of the site as a storage yard, as well as provide long‐term protection of human health and the environment should the future land use change. California Environmental Quality Act (CEQA): In compliance with the California Environmental Quality Act, DTSC has prepared a draft Notice of Exemption (NOE) for this project. The draft NOE states that the proposed cleanup will not have significant impacts on the environment. Public Comment Period: The public is invited to comment on the draft RAW and CEQA NOE during the 30‐day public comment period which runs from February 7, 2011 to March 8, 2011. All public comments will be carefully considered before DTSC makes the final decision for the site. Letter and email comments must be postmarked by March 8, 2011. Please mail your comments to Kevin Shaddy, DTSC Project Manager, 1515 Tollhouse Road, Clovis, CA 93611‐0522 or email your comments to [email protected]. Information Repositories: A copy of the draft RAW, the CEQA NOE and other site‐related documents are available for public review at the information repositories listed below:

Madera County Main Library‐ Reference Desk DTSC ‐ File Room 121 North G Street 1515 Tollhouse Road Madera, California 93637 Clovis, CA 93611‐0522 (559) 675‐7871 (559) 297‐3901 Call for an appointment

Hours: 8:00 a.m. ‐ 5:00 p.m. M‐F

All public documents provided by DTSC can be made available in an alternative format (i.e. Braille, large print, etc.) or in another language as appropriate, in accordance with state and federal law. Please contact Christina fu for assistance as noted in the DTSC Contacts section.

EnviroStor Database: Copies of key technical reports, fact sheets, and other site‐related information are available online at DTSC’s EnviroStor website: http://www.envirostor.dtsc.ca.gov.

DTSC Contacts for More Information:

For questions about the cleanup, please contact: Kevin Shaddy, Project Manager Email: [email protected] BPhone: (559) 297‐3929 For questions regarding the public participation process, please contact: Christina Fu, Public Participation Specialist Email: [email protected] Phone: Toll‐Free (866) 495‐5651 or (714) 484‐5488 TTY/TDD Speech‐to‐Speech users may dial 711 for the California Relay Service.

For media inquiries, please contact: Jeanne Garcia, Public Information Officier Email: [email protected] Phone: (818) 717‐6573

Department of Toxic Substances Control

Linda S. Adams Acting Secretary for

Environmental Protection

May 2,2011

Ms. Patricia Sullivan Senior Engineer

Leonard Robinson Acting Director

1515 Tollhouse Road Clovis, California 93611

Environmental Remediation Department Pacific Gas and Electric Company 3401 Crow Canyon Road, Room 177G San Ramon, California 94583

Edmund G. Brown Jr. Governor

APPROVAL OF REMOVAL ACTION WORKPLAN AND NOTIFICATION OF PROJECT MANAGER CHANGE, FORMER MADERA MANUFACTURED GAS PLANT SITE, MADERA COUNTY

Dear Ms. Sullivan:

A Public Comment Period on the draft Final Removal Action Workplan (RAW) for the Former Madera Manufactured Gas Plant Site was conducted between February 7 and March 8, 2011. No comments were received during the public comment period on either the draft RAW or the California Environmental Quality Act (CEQA), Notice of Exemption (NO E). A copy of the Responsiveness Summary prepared by the Department of Toxic Substances Control (DTSC) on April 8, 2011, documenting that no comments were received during the comment period, is enclosed for your records. While no comments on either the draft RAW or CEQA NOE were received, there was one comment card returned with a request that the individual be added to the mailing list for future outreach activities. A copy of that comment card was previously provided to you via email on March 29, 2011.

DTSC provided direction to you for revising the draft Final RAW so that it could be approved in final form in our email of March, 29, 2011. On March 31, 2011, you requested additional direction from DTSC via email on a minor language change needed regarding state acceptance in Sections 6.8.1 through 6.8.4. DTSC provided suggested language to address this issue to you via email on April 4, 2011.

On April 14,2011, DTSC received all necessary revisions to the Final RAW. DTSC has reviewed the revisions and hereby approves the RAW, dated April 2011 as final. DTSC has also approved the CEQA NOE. A copy is enclosed for your records.

KS:st KS01.511

Ms. Patricia Sullivan May 2,2011 Page

As has been discussed with you and Pacific Gas and Electric Company management over the past few months, personnel changes within DTSC's Manufactured Gas Plant Team have made it necessary to reassign DTSC project management responsibilities for the Madera MGP Site. Effective as of the date of this letter, Mr. Jeff Gymer will assume project management responsibilities for the Madera Site. Mr. Gymer can be reached at the letterhead address, by phone at (559) 297-3907, or via email at [email protected].

If you have any questions, please call me at (559) 297-3929, or Mr. Gymer at (559) 297-3907. It has been a pleasure working with you on the Madera MGP project.

Sincerely,

~1~ Kevin L. Shaddy, P.E. Supervising Hazardous Substances Engineer I Brownfields and Environmental Restoration Program

Enclosures

cc: Mr. E. Essi Esmaili, PhD, PG, CHG AECOM 302 Pendleton Way Oakland, California 94612

Mr. Russell Walls California Regional Water Quality Control Board 1 685 E. E Street Fresno, California 93706

Mr. Tedd Yargeau Senior Hazardous Substances Scientist Dept. of Toxic Substances Control 9211 Oakdale Avenue Chatsworth, California 91311-6505

KS:st KS01.511

Responsiveness Summary

Draft Final Removal Action Workplan, December 2010 Notice of Exemption - CEQA

Former Madera MGP Site

April 8, 2011

I. Introduction

Between February 7 and March 8, 2011, the California Department of Toxic Substances Control (DTSC) held a public comment period on the Draft Final Removal Action Workplan (RAW) and the CEQA - Notice of Exemption for the Former Madera MGP Site located in Madera, Madera County, California. The purpose of the comment period was to provide the public with an opportunity to review information regarding the project and to solicit public comments on the adequacy of the Draft RAW and appropriateness of the Notice of Exemption.

DTSC did not receive any comments on the draft RAW or the CEQA - Notice of Exemption during the public comment period.

DTSC did receive one response card requesting that the individual be added to the mailing list for the project. This has been done.

Project records are available for review at:

Department of Toxic Substances Control Regional Records Office 1515 Tollhouse Road Clovis, California 93611 (559) 297-3901

The RAW and associated documents are also available for review at:

Madera County Library - Reference Desk 121 North G Street Madera, CA 93637 (559) 675-7871

State of California - California Environmental Protection Agency Department of Toxic Substances Control

CALIFORNIA ENVIRONMENTAL QUALITY ACT NOTICE OF EXEMPTION

To: Office of Planning and Research State Clearinghouse P.O. Box 3044 1400 Tenth St., Room 212 Sacramento, CA 95812-3044

From: Department of Toxic Substances Control Brownfields and Environmental Restoration Program 1515 Tollhouse Road Clovis, California 93611

Project Title: Removal Action Workplan, Former Madera Manufactured Gas Plant Site

Project Location: The project is located at 9th and South E Streets, Madera, California 93637

Project Description: This project involves the approval of a Removal Action Workplan (RAW) by the Department of Toxic Substances Control (DTSC) pursuant to Health & Safety Code, chapter 6.8. The RAW was submitted by Pacific Gas and Electric Company (PG&E) as a Draft Final document on December 20, 2010. The RAW focuses on excavation and off-site disposal of site soils impacted with excessive levels of carcinogenic and non-carcinogenic polycyclic aromatic hydrocarbons (PAHs), lead, total petroleum hydrocarbons (TPH), benzene, ethylbenzene, and arsenic. The purpose of the project is to mitigate impacted soils that exceed the project-specific human health and environmental risk criteria to minimize human exposure to, and migration of, the identified chemicals of concern (COCs). The estimated volume of impacted soils is 3,700 cubic yards (about 5,600 tons) or approximately 250 truckloads. It is anticipated that most of the 3,700 cubic yards of impacted soils will be classified as non-hazardous waste; however it is possible that some portion of the materials removed from the site will be classified as hazardous waste for disposal purposes. The target concentrations for removal of soils containing these COCs are: 0.9 parts per million (ppm) for carcinogenic PAHs (expressed as benzo(a)pyrene equivalents), 2,180 ppm for fluoranthene, 1.6 ppm for naphthalene, 1,635 ppm for pyrene, 2,775 ppm for acenaphthene, 1,635 for benzo(g,h,i)perylene, 8.0 ppm for ethylbenzene, 0.71 ppm for benzene, 16 ppm for arsenic, 150 ppm for lead, and 4,000 ppm for TPH - diesel range. Upon completion of the soil excavation activities and associated confirmation sampling, the site will be backfilled and returned to its pre-project condition.

Project activities are planned to commence in late summer to early fall of 2011 and are expected to take approximately three months to complete.

Specific environmental safeguards and monitoring procedures that are enforceable and made a condition of project approval to ensure that impacts to the environment will be less than significant are identified in the RAW. These safeguards and monitoring procedures include; excavation plans, a confirmation sampling and analysis plan, Quality Assurance/Quality Control Plan, Health and Safety Plan, Transportation Plan, Spill Prevention Plan, Air Monitoring and Dust/Emissions Control Plan, Noise Monitoring and Mitigation Plan, Storm Water Management Plan, and the employment of Best Management Practices (BMPs) to ensure that Greenhouse Gas Emissions are maintained at less than significant levels. In addition, in the event resources of biological, cultural, or historical significance are found in the course of project activities, work will be suspended while a qualified biological, cultural, or historical resources specialist makes an assessment of the area and arrangements are made to protect or preserve any resources that are located. If human remains are discovered at the Site, no further disturbance will occur in the location where the remains are found, and the County Coroner will be notified pursuant to Health and Safety Code section 7050.5. The Coroner will determine disposition within 48-hours (Public Resources Code, section 5097.98).

An analysis of project activities upon existing environmental conditions indicates that implementation of environmental safeguards and monitoring procedures are enforceable and made a condition of project approval and will ensure that impacts to the environment will be less than significant. As a result, DTSC finds that the project is exempt from further environmental review under CEQA.

CEQA Notice of Exemption Form for VCPs March 1, 2008 Office of Planning & Environmental Analysis

1

State of California - California Environmental Protection Agency Department of Toxic Substances Control

Name of Public Agency Approving Project: California Environmental Protection Agency, Department of Toxic Substances Control

Name of Person or Agency Carrying Out Project: PG&E Exemption Status: [Check one]

[gI Class 30 Categorical Exemption: Cal. Code Regs., tit. 14, §15330 D General Rule: Cal. Code Regs., tit. 14, §15061(b)(3)

Reasons Why Project is Exempt:

DTSC has determined that the project is a Class 30 categorical exemption project (as provided in California Code of Regulations, title 14, sections 15300.2 and 15330) and is, therefore, exempt from the provisions of California Environmental Quality Act (CEQA) and the Guidelines for the following reasons:

1. The project is a cleanup action to be taken to prevent, minimize, stabilize, mitigate, or eliminate the release or threat of release of a hazardous waste or substance.

2. The project is a removal action costing $1 million or less. 3. The project will not be located on a site which is included on any list compiled pursuant to Cal. Gov. Code §

65962. 5 (http://calepa.ca.gov/sitecleanup/corteselist/default.htm ) 4. The project will not have a significant effect on the environment due to unusual circumstances. 5. The project will not result in damage to scenic resources, including but not limited to, trees, historic

buildings, rock outcroppings, or similar resources, within a highway officially designated as a state scenic highway.

6. The project will not cause a substantial adverse change in the significance of a historical resource. 7. The project will not require onsite use of a hazardous waste incinerator or thermal treatment unit. 8. The project will not require the relocation of residences or businesses. 9. The project will not involve the potential release into the air of volatile organic compounds as defined in

Health and safety Code section 25123. 10. The cumulative impact of successive projects of the same type on the same place, over time, if there are

any, will not be significant. 11. The project will be consistent with applicable State and local environmental permitting requirements

including, but not limited to: (a) offsite disposal; (b) air quality rules such as those governing particulate emissions; and (c) applicable local requirements; and approved by the regulatory body with jurisdiction over the Site.

Evidence to support the above reasons is documented in the project file record, available for inspection at:

Department of Toxic Substances Control Brownfields and Environmental Restoration Program 1515 Tollhouse Road Clovis, California 93611


2

State of California - California Environmental Protection Agency

APPROVAL:

TO BE COMPLETED BY OPRISCH ONLY

Date NOE Filed:



3

AECOM 510.622.6600 Telephone 2101 Webster Street, Suite 1900 510.834.4304 Facsimile Oakland, California 94612

To enhance and sustain the world’s built, natural and social environments

June 20, 2011

Jeff Gymer, PE Department of Toxic Substances Control Hazardous Substances Engineer I Brownfields Revitalization Unit 1515 Tollhouse Road Clovis, California 93611

Subject: Abandonment of Monitoring Wells MW-MAD-1, MW-MAD-2, and MW-MAD-3 Madera Former Manufactured Gas Plant Site Madera, California

Dear Mr. Gymer,

AECOM Technical Services, Inc. (AECOM), on behalf of Pacific Gas and Electric Company (PG&E), has prepared this report to document the well abandonment activities conducted at the Madera Former Manufactured Gas Plant (MGP) Site in Madera, California (the Site) on June 2, 2011. The well abandonment was conducted in accordance with a Workplan prepared by AECOM, dated March 9, 2011. The Workplan was approved by the Department of Toxic Substances Control (DTSC) in an email to PG&E and AECOM dated March 29, 2011. The three abandoned onsite monitoring wells included MW-MAD-1, MW-MAD-2, and MW-MAD-3 (Figure 1). The Workplan included the rationale for abandoning these monitoring wells and the preferred method of well abandonment was in-situ pressure grouting.

History

Monitoring wells MW-MAD-1, MW-MAD-2, and MW-MAD-3 were installed in 1991 to a depth of 95 feet below ground surface (bgs) as part of the Preliminary Endangerment Assessment by Dames and Moore in 1991. The groundwater level at that time was approximately 85 feet bgs; however, since that time, the groundwater table has dropped significantly in the area. In 2007 when investigative work resumed at the Site, all three wells were dry. Three additional wells (MW-MAD-4, MW-MAD-5, and MW-MAD-6) were installed to supplement the monitoring network. Gauging events conducted by AECOM from January 2008 to March 2010 in these deeper wells show the groundwater depth to be approximately 107 feet bgs, representing a drop in the groundwater level of approximately 22 feet since 1991. Accordingly, the shallow dry wells were no longer needed to monitor the quality of the groundwater at the Site. In addition, the three subject monitoring wells were located within the footprint of areas that will be excavated as part of the planned remediation at the Site (AECOM Final Removal Action Work Plan, 2011).

Pre-Field Activities

AECOM contacted the County of Madera Department of Environmental Health Services (the County) and reviewed its guidelines for monitoring well destruction and those of the State of California (Water Well Standards: State of California Bulletin 74-90). A well destruction application package, including a cover letter, the application and application fee, a brief summary of the scope of work, copies of the proposal to

AECOM Mr. Jeff Gymer 2 June 20, 2011

To enhance and sustain the world’s built, natural and social environments

DTSC, a copy of the approval from DTSC, a plot map, and insurance information from the drilling subcontractor was assembled and submitted to the County for its approval. The County approved the in-situ pressure grouting option and an approved Well Destruction Permit was received on May 26, 2011 (see attached permit no.11-0028-DESWELL).

AECOM amended the Madera Removal Action Health and Safety Plan to include task hazard analysis and standard operating procedures (SOPs) for the abandonment of monitoring wells via pressure grouting.

AECOM subcontracted with Woodward Drilling, Inc., of Rio Vista, California, to perform the pressure grouting activities. Woodward Drilling is a licensed (C-57) well drilling contractor and a California Unified Certification Program Minority, Woman, and Disadvantage Business Enterprise contractor.

Field Activities

On June 2, 2011, AECOM and Woodward Drilling convened at the Site to conduct the well abandonment activities. A health and safety tailgate meeting was held with the drilling subcontractor to discuss the potential hazards at the Site and the scope of work. The County grout inspector, who arrived after the tailgate meeting, was also briefed for safety, and stayed onsite for the remainder of the day to observe the abandonment of all three wells.

Typically, the County requires the complete removal of the upper five feet of the well. Because the wells are located within planned excavation areas where that upper five feet of material will be removed anyway, only the well boxes were removed. The wells were then grouted to the surface.

Each well was initially sounded with a tape to its total depth to determine if there were blockages or water in the wells. A trace of water was detected in the bottom of MW-MAD-2, likely due to subsurface condensation; the other two wells were dry.

Once the wells were verified to be clear of any obstructions, each well was pressure grouted with neat cement through a tremie pipe inserted into each well. Because the wells were more than 30 feet in depth, the tremie pipe was used to inject the grout mixture in each well to prevent air pockets from forming in the grout, as per county guidelines. The grout mixture consisted of 47# Portland cement with Premium Gel at a 29:1 ratio. Once the wells were completely filled with grout, a pressure cap was applied to the well head, and a pressure seal was held at least 25 pounds per square inch for at least five minutes using an air compressor. The pressurization of the grout at the surface helps assure that the intertices of the well screen and filter pack has been filled with grout. After the pressure seal and cap were removed, if the grout level in the well had dropped, additional grout was added to the well casing until the grout reached the ground surface.

During grouting of MAD-MW-1, the tremie pipe became stuck and could not be fully recovered. Per the direction of the County inspector, as much tremie pipe as possible was recovered (approximately the upper 10 feet of piping), and grouting continued using a new tremie pipe. Approximately 50 feet of tremie pipe was lost down the hole. This is not assumed to be an issue as the lost pipe was also filled with grout.

Following the grouting, the permit was signed, and the grout inspector left the Site. All holes were rechecked to determine if the grout levels had dropped again. Any head space was filled with grout, and the area around the holes was cleaned up. AECOM and Woodward Drilling then left the Site.

Future Work

As noted above, it is expected that at least the upper five feet of grouted material will be removed and replaced with clean fill during the upcoming excavation of the Site. Care will be taken to not disturb the grout below the level of the excavations to protect groundwater quality.

AEC

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LEGEND

MONITORING WELL LOCATIONS TO BE ABANDONEDEXCAVATION AREA DESIGNATION

RECOMMENDED EXCAVATION 2' BGS

RECOMMENDED EXCAVATION 3'-4' BGS



REMEDIAL AREA FOR ARSENIC CONTAMINATION

FIGURE 1

WELL DESTRUCTIONLOCATION MAP

FORMER MADERA MGP SITEMADERA, CALIFORNIADATE: MAY 2011

5MW-MAD-1

MONITORING WELL LOCATIONS TO REMAIN IN PLACEMW-MAD-5

WWOORRKK NNOOTTIICCEE

PG&E Former Madera Manufactured Gas Plant 9th Street and South E Street

Madera, California

Cleanup Work Scheduled to begin week of July 15, 2011 The California Department of Toxic Substances Control (DTSC) is distributing this work notice to notify area residents and businesses that PG&E will begin cleanup work at the former Madera Manufactured Gas Plant site (Site) located at 9th Street and South E Street in Madera. The work is planned to address the soil at the Site, impacted with polycyclic aromatic hydrocarbons (PAHs), total petroleum hydrocarbons (TPH), volatile organic compounds (VOCs), and metals such as lead and arsenic.

Work Planned: The entire cleanup project is expected to last four months. Work will take place between the hours of 7:00 am and 5:00 pm Monday through Friday. Work planned for the Site includes the following:

Preliminary work to ready the Site includes installing temporary fences and visual barriers around the Site, installing air monitoring stations, temporary relocation of features such as trash bins, identification of underground utilities at the Site, marking of monitoring wells within excavation areas for protection, preparation for use of an external water source for dust control, and setting up of access and exit paths for equipment.

Excavation of 3,700 cubic yards (about 238 truckloads) of impacted soil from a depth of 2 to 10

feet; soil will be hauled off-site to permitted landfill(s). Sampling of excavated areas to ensure that all impacted soil has been removed. Backfilling excavated areas with clean imported soil.

Grading to restore the Site to its original grade and placing 6 inches of crushed rock or gravel,

underlain by geo-fabric to prevent weed growth. The work will include the use of major construction equipment such as excavators, backhoes,

loaders, compactors, and trucks to haul soil to and from the Site.

Community Protection Measures: To ensure that the surrounding community is protected, all work will take place in accordance with a DTSC-approved site-specific Health and Safety, which will include the following measures to lessen off-site impacts to surrounding community:

Installation of a heavy sound curtain and wind-screen on the existing and temporary fences around the Site.

Measures to be implemented to lessen construction noise include: sound curtains, mufflers on certain equipment, and limiting work hours to city-approved schedules.

Continuous 24-hour air sampling and real-time air monitoring at the excavation areas and along the Site perimeter.

Methods to control odor and dust during excavation activities include: using water and environmentally safe additives such as foam; minimizing the size of excavation pits for easy control; covering excavated areas with plastic sheeting; limiting the amount of soil stockpiled on site and covering soil stockpiles with plastic sheeting; covering all trucks leaving the Site, and daily street sweeping of the public roadways in the immediate vicinity of the Site.

Truck Route: To minimize truck traffic and idling, trucks will be staged at designated locations within a few miles of the Site in industrial or commercial zone areas. The trucks will be directed into the Site for loading by the on-site Construction Supervisor. Once loaded, trucks will be tarped, visually inspected and cleaned, and directed out of the Site by traffic control personnel. Trucks will exit the Site, head east onto 9th Street, continue to Highway CA-145/South Gateway Drive, and turn left onto Highway 99.

For More Information: If you have any questions about this work, please contact:

DTSC Project Manager, Jeff Gymer at (559) 297-3907 or by email at [email protected]

DTSC Public Participation Specialist, Christina Fu at (866) 495-5651 (Press 4 twice) or

(714) 484-5488 or by email at [email protected]

For media inquiries, please contact DTSC’s Public Information Officer, Jeanne Garcia at

(818) 717-6573 or by email at [email protected]

You may also call PG&E’s toll-free number at 1-866-247-0581

Where to Find Project Documents: DTSC encourages you to review the investigation work plan and other site-related documents which are available at the information repositories listed below:

Madera County Library 121 North G Street Madera, California 93637 (559) 675-7871

Department of Toxic Substances Control - File Room 1515 Tollhouse Road Clovis, CA 93611 (559) 297-3901

To find information on the web, please visit the following site: www.envirostor.dtsc.ca.gov

All documents made available to the public by DTSC can be provided in an alternative format (i.e. Braille, large print, etc.) or in another language as appropriate, in accordance with State and Federal law. Please contact the Public Participation Specialist noted above for assistance.

Community Profile Former PG&E Manufactured Gas Plant, Madera, California September 2010

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Contents

1.0 INTRODUCTION ............................................................................. 1-1 1.1 Community Profile .................................................................................. 1-1

1.2 Purpose of Community Profile .................................................................. 1-1

1.3 Sources of Information for the Community Profile ....................................... 1-1

1.4 Organization of the Community Profile ...................................................... 1-2

2.0 SITE AND COMMUNITY DESCRIPTION ............................................ 2-1 2.1 Site Location, Description and Surrounding Land Uses ................................. 2-1

2.2 Site Visibility .......................................................................................... 2-1

2.3 Site History ............................................................................................ 2-1

2.4 Site Investigations and Contaminants of Concern ....................................... 2-3

2.5 Proximity to Residential Areas .................................................................. 2-3

2.6 Proximity to Sensitive Receptors .............................................................. 2-4

2.7 Proximity of other Cal/EPA or US EPA Projects ............................................ 2-4

2.8 Community Composition and Characteristics .............................................. 2-5

2.8.1 County of Madera .................................................................... 2-5 2.8.2 City of Madera ......................................................................... 2-6 2.8.3 Local Organizations .................................................................. 2-7

3.0 LOCAL AWARENESS AND INTEREST ............................................... 3-1 3.1 Public Participation History ....................................................................... 3-1

3.2 DTSC Community Survey ........................................................................ 3-1

3.3 Media Coverage of Madera MGP Project Site .............................................. 3-2

4.0 RECOMMENDED PUBLIC PARTICIPATION ACTIVITIES ................... 4-1 4.1 DTSC Information Contacts ...................................................................... 4-1

4.2 Mailing List and Email List ........................................................................ 4-2

4.3 Information Repository ............................................................................ 4-2

4.4 Fact Sheet(s) ......................................................................................... 4-3

4.5 Public Comment Period on the draft RAW .................................................. 4-4

4.6 Public Notices for the draft RAW ............................................................... 4-4

4.7 Responding to Public Comments on the draft RAW ...................................... 4-4

4.8 Work Notices ......................................................................................... 4-5


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4.9 Coordination with the city and county of Madera ........................................ 4-5

4.10 Additional Activities .............................................................................. 4-5

4.11 Schedule of Public Participation .............................................................. 4-5


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LIST OF TABLES, FIGURES AND APPENDICES

LIST OF TABLES

Table 1 – Sensitive Receptors within a half-mile radius of site

Table 2 – Cal/EPA and US EPA Sites within a half-mile radius of site

Table 3 – City of Madera Population Details

Table 4 – Public Participation & Project Schedule

LIST OF FIGURES

Figure 1 – Site Location Map

Figure 2 – Current Photo of Site

LIST OF APPENDICES

Appendix A – DTSC Community Survey and Results

Appendix B – PG&E Former Gas Holder Key Contact List


1-1

1.0 INTRODUCTION

1.1 Community Profile

This Community Profile has been prepared for the California Department of Toxic

Substances Control (DTSC) for a former Pacific Gas and Electric Company (PG&E)

manufactured gas plant site located at the corner of Ninth and South E Streets in

downtown Madera.

1.2 Purpose of Community Profile

This community profile is being written to address the requirements of a Voluntary

Cleanup Agreement (VCA) executed in May 2006 between PG&E and DTSC. DTSC is the

lead state environmental agency responsible for overseeing investigation, assessment, and

remediation activities. DTSC policy requires public participation throughout the cleanup

process. The purpose of this community profile is to:

• Describe the site, its surrounding land uses and its community demographics.

• Identify and determine the level of community awareness and interest on the

site.

• Identify key local officials, community organizations, adjacent businesses and

residents, and interested members of the community.

• Recommend public participation activities to facilitate two-way communication

with the community and other interested parties.

1.3 Sources of Information for the Community Profile

This community profile is based on information obtained from a variety of sources

including the results of a DTSC community survey, technical documents prepared for the

site, recent demographic information issued by private research firms and federal and

state government reference sources, and a review of information maintained by the city of

Madera and the county of Madera.


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1.4 Organization of the Community Profile

The community profile contains four sections: 1) Introduction, 2) Site and Community

Description, 3) Public Participation, and 4) Recommended Public Participation Activities.

Appendix A contains the community survey responses, and Appendix B contains a key

contact list for this site.


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2.0 SITE AND COMMUNITY DESCRIPTION

2.1 Site Location, Description and Surrounding Land Uses

The site is approximately one-acre in size and is located at the corner of 9th and South E

Streets about one-quarter of a mile south of downtown Madera, California (Figure 1). The

site is bordered on the north by 8th Street (formerly Clinton Street), on the south by 9th

Street, on the west by South E Street, and on the east by an alley that runs between 8th

and 9th Streets. A small storage shed is located in the northwest corner of the site and the

remainder of the site is paved with asphalt and concrete. The site serves as a storage

area for electrical equipment and power poles, as well as a field mobilization facility for

PG&E service operations. The site is entirely fenced with a six-foot cyclone fence and

privacy screens with access through a locked gate on 8th Street.

The area in which the site is located carries the zoning designation of general commercial

and the areas immediately to the north, east and west are occupied by a mix of

commercial tenants, including an auto dealership, the offices of the local newspaper, the

Madera Tribune, and an agricultural supplies retailer, and several vacant lots. There are

active Union Pacific rail road tracks about 200 feet to the west of the site. Immediately to

the east of the site on the opposite side of the alley are two small, modest residential

homes. With the exception of these two homes, the nearest residential area is about two

blocks to the east of the site and consists of modest single-family homes and duplexes.

2.2 Site Visibility

The site is located one-quarter of mile south of downtown Madera and is easily visible from

surrounding commercial businesses and to general passersby and passing traffic. Apart

from the small shed situated near its northwest entrance, the site has the appearance and

characteristics of a paved parking area.

2.3 Site History

Madera’s manufactured gas plant was constructed in 1913, and was originally owned and

operated by the Madera Gas Company. The plant originally occupied only a center portion

of a block lying between E Street and the alley. Between 1914 and 1919, the facility

gradually expanded until it occupied the entire block, extending from 9th Street to Clinton

Street (now renamed 8th Street). Historic maps indicate that the facility was originally a

“L” shaped building that housed gas generators, a 20,000 cubic-foot gas holder, an engine


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room, and a variety of smaller structures supporting the production process. For 17 years,

the plant served the residents and business of Madera, manufacturing gas for lighting and

heating, first under the Madera Gas Company and later under the ownership of the

Southern California Gas Company. In 1931, natural gas became available to Madera and

the property was acquired by PG&E. By 1935, the plant had been dismantled and

removed and the property has been used as by PG&E for storage and field crew

mobilization activities.

Figure 1 – Site Location Map


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Figure 2 – Current Photo of site from 8th Street

2.4 Site Investigations and Contaminants of Concern

Since 1986, several phases of environmental site investigations have been conducted to

determine if manufactured gas plant residues are present in soil and groundwater. These

investigations have identified varying levels of polycyclic aromatic hydrocarbons (PAHs),

total petroleum hydrocarbons (TPHs) and metals in soils at depths of up to 20 feet. PG&E

has prepared a draft cleanup plan (called a draft Removal Action Workplan or RAW) for the

site and DTSC is currently reviewing this cleanup plan. DTSC anticipates that the site

cleanup will be conducted in the summer of 2011.

2.5 Proximity to Residential Areas

The site is located in a predominantly commercial area about one-quarter of a mile south

of downtown Madera. Two residences are located about 20 feet to the east of the site


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directly across the alley that runs the length of the site. With the exception of these two

residences, the closest residential area is located about three blocks to the east of the site

and consists of modest single-family homes.

2.6 Proximity to Sensitive Receptors

Sensitive receptors are defined as facilities where sensitive receptor population groups

such as children, the elderly, and the acutely or chronically ill, are likely to be located.

Facilities in this category include schools, playgrounds, childcare centers, retirement

homes, hospitals, and medical clinics. There are 10 such facilities located within half-mile

of the site, which are listed in Table 1 below.

Table 1 – Sensitive Receptors Within a half-mile radius of 9th & South E Streets, Madera, CA

Facility Facility Type Address

Phone Miles from Site

Madera Rehabilitation Convalescent Hospital

Skilled Nursing 517 South A St. 559-673-9228 .20

Court House Park Park/Playground 210 W. Yosemite Avenue 559-673-0291 .26 Madera Adult Cay Care Senior Services

Center 322 West 6th Street 831-675-3119 .28

Madera County Day Care Center

Preschool 525 E. Yosemite Avenue 831-675-4003 .30

McNally Memorial Park Park/Playground 825 South A Street .32 Heartland Opportunity Center

Senior Services Center

323 North E Street 559-674-8828 .35

Madera High School High School 200 South L Street 559-675-4444 .41 St. Joaquim Catholic School

Religious Elementary School

401 West 5th Street 559-673-3290 .43

Sierra Vista Elementary School

Elementary School 917 E. Olive Avenue 559-674-8579 .46

Eastside Head Start Preschool 1112 S. A Street 559-674-1268 .50

2.7 Proximity of other Cal/EPA or US EPA Projects

Table 2 shows the proximity of other open California Regional Water Quality Control Board

(Water Board) and DTSC sites within a half-mile radius of the former PG&E Manufactured

Gas Plant site1

1 DTSC Envirostor and RWQCB Geotracker

. The list also includes a related property, the PG&E former Service Center

site at 309 South Gateway Drive, which is a closed DTSC project located across the


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railroad tracks from the MGP project site that is subject to an environmental deed

restriction. Within the same radius, Cal EPA records 22 other sites that were past subjects

of environmental investigations, cases that are now closed and complete. Of the 28 closed

and open Cal EPA site investigations within a half-mile radius of the site, all but three

involved leaking underground storage tanks.

Table 2 - Cal/EPA Sites Within a half-mile Radius of 9th & E Streets, Madera, CA

Site Name and Responsible Agency

Site Type Status Address Miles from Site

Bilco Oil – RWQCB/Madera County

LUST Cleanup Site Open - Remediation 529 S Gateway Dr .15 miles

A & R Gas & Go – Madera County/RWQCB

LUST Cleanup Site Open - Inactive 300 9TH St East .19 miles

PG&E Former Madera Service Center - DTSC

Cleanup Program Site Closed – Land Use Restrictions

309 S Gateway Dr .13 miles

Madera PRODUCE - RWQCB LUST Cleanup Site Open - Inactive 701 S Gateway Dr .22 miles

Madera Cleaners & Laundry - RWQCB

Cleanup Program Site Open – Site Assessment 321 South C St .28 miles

S & L Texaco - Madera County/RWQCB

LUST Cleanup Site Open – Site Assessment /Interim Remedial Action

701 1ST St South .38 miles

2.8 Community Composition and Characteristics

The sections below provide general background information about the geographic area in

which the site is located, demographic and economic information on Madera County, the

City of Madera, and summary information on local organizations serving the community.

2.8.1 County of Madera

Located south of Yosemite National Park in California’s San Joaquin Valley and 166 miles

east of the San Francisco Bay Area, Madera County is situated at the geographic center of

California, bordered to the north by the San Joaquin River and to the south by the

Chowchilla River. The majority of the county’s industrial and residential areas are

concentrated along Highway 99, one of California’s primary north-south traffic corridors.

According to a the latest estimate by California’s Department of Finance, Madera County’s

population stood at 151,938 in 2008, placing it 33rd among California counties in terms of

population. The same source ranks it as California’s seventh fastest growing county and

projects its population will increase to 212,900 by the year 2020. It is the also the poorest

county in California in terms per capita personal income, which stood at $22,580 in 2006.


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Madera is governed by a five-person Board of Supervisors, whose members are elected by

district. Supervisor Ronn Dominici represents District 3, the district in which the site is

located. Board Meetings are open to the public and are held at 9 am on the first four

Tuesdays of each month at the Board of Supervisors Chambers, located in the County

Government Center at 200 West Fourth Street in downtown Madera.

2.8.2 City of Madera

Founded in 1876 by the California Lumber Company and incorporated in 1907, Madera is

the county seat of Madera County and its most populous city, with three times the

population of the county’s next largest city, Chowchilla. According to the most recent

estimates by the United States Census Bureau, Madera’s population was 52,725 in 2008,

with male residents outnumbering females 52 percent to 48 percent. Hispanic residents

comprise over three quarters of the city’s total population.

Table 3 provides a summary of demographic data derived from the latest U.S. Census

Department estimates issued for the 2006-2008 time period, supplemented by economic

data from California EDD and Dataquick Information Systems.

Table 3 – City of Madera Population Details2

Category

Count Percent

Total Population 52,725 100% Male 27,488 52.1 Female 25,237 47.9 Median Age 27.3 - Household Size 3.62 - White 41,264 78.2 African-American 2,093 4.0 Asian 1,152 2.2 Some Other Race/2 or More Races 8,216 15.6 Hispanic (included in categories above) 39,836 75.6 Median Household Income $41,477 - Median Home Sale Price (April 2010) $124,500 - Unemployment Rate (April 2010) 6,000 24.2 High School Graduate or Higher 55.0 Bachelors Degree or Higher 7.6 Foreign Born Residents 16,289 30.9

Madera is a general law city operating under a council-manager form of government. It

maintains a workforce of over 400 full-time and part-time employees and currently

operates on an annual budget of $58 million. Legislative power and policy-making are

entrusted to the City Council, which consists of five City Council members who are 2 American Community Survey, 2010 (U.S. Census Bureau), Labor Force Data for Sub-County Areas, April 2010 (California EDD), Dataquick Information Systems, April 2010.


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popularly elected and serve four-year terms. The Council selects a Mayor every year from

among its ranks and also appoints the City Manager, who acts as the City’s chief

administrator, overseeing the day-to-day affairs of the City. In addition to their other

functions, Council members also serve on the city’s Redevelopment Agency and Housing

Authority. City Council meetings are held on the first and third Wednesdays of each month

at 6.00 p.m. in the Council Chambers at Madera City Hall, which is located at 205 West

Fourth Street in downtown Madera.

2.8.3 Local Organizations

Below is a summary the key local organizations that have been established to serve the

City of Madera and the surrounding community.

Madera Chamber of Commerce: The Madera Chamber of Commerce is the leading

business advocacy organization for both the City and County of Madera. The Chamber

maintains a busy calendar of events, hosting business forums, government affairs

breakfasts, and trade shows in addition to its regular membership meetings. In support of

Madera’s business community, the Chamber provides business and agency referrals,

assists out-of-town event coordinators in bringing their activities to Madera, supplies

resource materials to potential new businesses, assists in small business start-ups,

publishes an e-newsletter to inform its member firms of legislative developments that

affect their businesses, and partners with the Yosemite Sierra Visitors Bureau to promote

tourism in Madera County and with State Center Community College District on

educational programs. Chamber representatives hold seats on the Madera County

Economic Development Commission, the Madera County Workforce Development Board,

and other civic organizations.

Madera County Economic Development Commission (MCEDC): The MCEDC is a

Joint Powers Authority involving both the County and its two largest cities, Madera and

Chowchilla. Commission members include local Chambers of Commerce, representatives

of municipal and county agencies, Madera’s Workforce Investment Board, and

representatives of industry and the utilities sector. Among the programs administered by

MCEDC are a Small Business Revolving Loan Program and a Brownfields Cleanup Revolving

Loan Program.

San Joaquin River Conservancy (SJRC): Based in Fresno, the San Joaquin River

Conservancy is a public advocacy organization committed to acquiring, managing, and


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preserving lands within the flood plains of the San Joaquin River, one of the two great

rivers sustaining the California’s Central Valley’s and its robust agricultural industry.

Governed by a Board comprised of local citizens and representatives of local and state

agencies, the SJRC’s program involves the acquisition of 6000 acres from willing

landowners in order to manage and conserve them for public enjoyment while protecting

native habitat. William Wattenbarger currently sits as Madera’s Citizen Representative on

the Conservancy’s board. One of the Conservancy’s chief objectives is implementation of

the San Joaquin Parkway Master Plan, a green space and wildlife corridor extending 22

miles along both sides of the river.


3-1

3.0 LOCAL AWARENESS AND INTEREST

This section presents a summary of community interest in site investigation and cleanup

activities and media coverage received to date.

3.1 Public Participation History

DTSC began public participation activities for this project in October 2006. To date, in

support of this project, DTSC has performed the following tasks:

• Created a project specific mailing list including a quarter-mile radius from the

site.

• Established an information repository at the local library for public review of

project documents.

• Conducted telephone briefings of representatives of the city, local business

organizations and media.

• Issued a site-specific community survey which was distributed via US mail and

door-to-door outreach in the immediate vicinity of the site.

• Prepared this site-specific community profile.

3.2 DTSC Community Survey

To gauge initial community interest in the site, DTSC mailed out 414 community surveys in

May 2010 to all properties and off-site owners within a quarter-mile radius of the site, as

well as to local business owners, local, state and federal representatives, and elected

officials. Of the 414 surveys distributed, DTSC received ten completed surveys (nine in

English and one in Spanish), for a response rate of two percent. Results of the survey are

summarized below and the survey responses are presented in Appendix A.

• Three individuals were unfamiliar with the site; five individuals had heard of the

site but have little or no information on it; and two individuals knew a lot about

the site.

• Three individuals stated they knew nothing about the site and could not

determine if they were interested or not; four individuals stated they had some

interest in the site and would be interested in reading or hearing more; and three


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respondents stated they were very interested in the site and would read

information mailed to them.

• Three individuals stated they might attend a meeting about the site; four

individuals stated they would not attend a meeting about the site; and three

respondents stated they might attend a meeting about the site if it was

convenient.

• Seven individuals stated the best way to provide information to them would be

through fact sheets and letters; three individuals stated they would prefer email

communications.

• Five individuals stated that DTSC could contact them for more information; five

individuals stated they did not want DTSC to contact them for more information.

Comments from Survey:

Individuals were given the option of adding open-ended comments. One respondent noted

his property was next door to the project site; a second respondent commented that he was

unsure how his participation might help. One additional form that was returned without

response to the survey questions expressed the sender’s wish that the site “just be cleaned

up”.

3.3 Media Coverage of Madera MGP Project Site

A search of the archives of the Madera Tribune and Fresno Bee shows that there has been

no media coverage regarding environmental investigation activities for the site.


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4.0 RECOMMENDED PUBLIC PARTICIPATION ACTIVITIES

Based on the community survey responses and that the site is located in a commercial

area but is adjacent to residential areas, it is anticipated there will be a moderate level of

interest on the environmental cleanup. The following activities are recommended to

provide members of the public with site-specific information and appropriate opportunities

for public comment:

• Designated DTSC Contact Person

• Mailing List and Email List

• Information Repository

• Fact Sheet on the Draft Removal Action Workplan (RAW)

• Public Comment Period

• Public Notice on the Draft RAW

• Responsiveness Summary

• Work Notice(s)

• Coordination with the City of Madera and County of Madera

• Additional Outreach Activities, as needed.

4.1 DTSC Information Contacts

Information contacts have been established for the public to direct questions and concerns

about the project. These contacts will also be included on all information distributed to the

public by DTSC.


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Kevin Shaddy DTSC - Project Manager 1515 Tollhouse Road Clovis, CA 93611

(559) 297-3929 [email protected]

4.2 Mailing List and Email List

A mailing list has been developed for this project. This mailing list is included as

Appendix B and includes key federal, city, state and county representatives; local

businesses in proximity to the site; representatives of environmental, social and

neighborhood organizations; and area residents. The mailing list will be updated regularly

to ensure accuracy of the information and to add the addresses of individuals that request

to be on the list.

An email list has been prepared for the site and includes representatives of the city and

county; local social, environmental, and neighborhood organizations; adjacent property

owners and owners’ agents; community members; and individuals that specified email

contact as the preferred method of communication in the DTSC survey. The email list will

be updated regularly to ensure accuracy of the information and to add the addresses of

individuals that request to be on the list.

4.3 Information Repository

To facilitate community access to project related documents, a local information repository

has been established at the Madera County Main Library. This repository will include

copies of key technical documents, the Community Profile, fact sheet(s), work notices, and

other new technical documents as they are developed and approved.

TTY/TDD Speech-to-Speech users may dial 711 for the California Relay Service

All documents made available to the public by the DTSC can be made available in alternate

format (i.e. Braille, large print, etc.) or in another language as appropriate, in accordance

with State and Federal law. Please contact Christina Fu as noted above for assistance.

Madera County Main Library 121 North G Street Madera, California 93637 (559) 675-7871 Contact: Linda Sitterding, County Librarian, [email protected]

Christina Fu DTSC - Public Participation Specialist 5796 Corporate Avenue Cypress, California 90630 [email protected] Toll-Free (886) 495-5651 (714) 484-5488

http://www.watsonville.lib.ca.us/index.shtml�

mailto:[email protected]�


4-3

Current library hours:

Monday 11:00 a.m. to 6:00 p.m.

Tuesday 10:00 p.m. to 5:00 p.m.

Wednesday 10:00 a.m. to 5:00 p.m.

Thursday 11:00 a.m. to 6:00 p.m.

Friday 10:00 a.m. to 4:00 p.m.

Saturday Closed

Sunday Closed

Administrative Record: In addition to the library repository, the complete project file

will be available for review at DTSC’s regional office in Clovis, California.

Department of Toxic Substances Control - File Room 1515 Tollhouse Road Clovis, CA 93611-0522 (559) 297-3929 Hours: 8:00 a.m.-5:00 p.m. M-F

EnviroStor Database: Copies of key technical reports, fact sheets, and other site-related

information are available on-line at DTSC’s Envirostor website:

4.4 Fact Sheet(s)

www.envirostor.dtsc.ca.gov

DTSC will prepare fact sheets at key project milestones to provide interested community

members with information about investigation and cleanup activities.

DTSC will prepare a fact sheet at the draft Removal Action Workplan (draft RAW) stage to

provide a general overview of the site history, the nature and extent of the contamination

found at the site, the various remedies evaluated for site cleanup, and the recommended

cleanup approach. DTSC will announce the start and end dates of the public comment

period and contact information. The fact sheet will be written in easily understandable

language and translated into Spanish. The fact sheet will be distributed to all individuals

on the mailing and email list.


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4.5 Public Comment Period on the draft RAW

A public comment period of at least 30 days will be held on the draft RAW. The public will

be notified in advance of the start and end dates via fact sheet and public notice. This

period will allow community members and other interested parties an opportunity to share

their concerns and questions about the draft RAW. Both written and oral comments will be

accepted.

4.6 Public Notices for the draft RAW

A public notice will be placed in the Madera Tribune at the start of the public comment

period on the draft RAW. The Madera Tribune

• A brief overview of the cleanup plan proposed in the draft RAW.

is a newspaper of general circulation that

services the city of Madera and the surrounding areas. The public notice will be placed as

a display advertisement in the front portion of the newspaper. The public notice will

include the following information:

• The locations of the information repositories where this document is available

for review.

• The start and end dates of the public comment period.

• The address to which members of the public can send written comments.

• An announcement of the time, date, and location for the public meeting if one is

held.

4.7 Responding to Public Comments on the draft RAW

Public comments may be submitted through direct mail, phone calls, emails, and at

community briefings and public meetings. All published documents distributed by DTSC

will include the phone number of the DTSC contacts to call with questions or comments

about the environmental cleanup at the site. After the end of the public comment period,

a response to comments document, called a Responsiveness Summary, will be prepared to

address comments received during the public comment period on the draft RAW. The

summary will explain how public comments were considered and how they were, or were

not, incorporated into the final cleanup decision for the site. All individuals that provided


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comments will be sent a copy of the Responsiveness Summary. This document will also be

available at the Information Repositories established for the site.

4.8 Work Notices

Work notices will be sent to the community prior to start of field work for each specific

phase of the investigation and remediation activities. Work notices will be sent at least

five days prior to the start of such work and will include the following information: work

being done; impacts, if any, to area residents; schedule; and contact information for

individuals to call with questions and concerns.

4.9 Coordination with the city and county of Madera

Public participation activities will be coordinated with Madera and County of Madera to

ensure that the necessary permits are secured and appropriate staff are aware of the work

should they receive calls from community members.

4.10 Additional Activities

DTSC may conduct outreach activities in addition to those described above. DTSC may

provide updates to the City Council, or send out additional fact sheets, letters, flyers or

postcards to ensure that the community is kept informed on the status of the site.

Further, to maximize participation, outreach activities may also be implemented, as

suggested by community members.

If significant new information becomes available, the information will be provided to the

community. If information substantially changes the features of the cleanup set forth in

the RAW document, DTSC may seek additional public comment.

4.11 Schedule of Public Participation

Table 4 presents a tentative schedule for the implementation of public participation

activities.


4-6

Table 4 – Public Participation & Project Schedule

Public Participation Activity Schedule

Develop and update mailing list September 2009, ongoing

Prepare and issue community survey March 2010

Community Profile completed September 2010

Issue fact sheet for draft RAW document Fall 2010

30-day public comment period for RAW January 2011

Prepare responsiveness summary Spring 2011

Finalize cleanup plan, RAW Spring 2011

Prepare cleanup design documents and conduct bidding for the Site cleanup Spring 2011

Issue Work Notice for implementation of RAW Spring 2011

Begin Site Cleanup Summer/Fall 2011

Appendix A

DTSC Community Survey and Results

of 3


Maziar Movassaghi Acting Director

5796 Corporate Avenue Cypress, CA 90630-4732


Maziar Movassaghi Acting Director

5796 Corporate Avenue Cypress, CA 90630-4732

Linda S. Adams Secretary for Environmental

May 3, 2010 Dear Community Member: The purpose of this letter is to update you on an environmental investigation and proposed cleanup project being conducted by Pacific Gas and Electric Company (PG&E) at a former manufactured gas plant site located at 9th Street and South E Street in Madera. We are also writing to encourage you to complete and return the brief community survey enclosed with this letter. A site location map and picture of the site are shown on the second page of this letter. The California Department of Toxic Substances Control (DTSC) is the regulatory agency providing oversight of the investigations and future cleanup activities for this project. Your response to the enclosed survey will enable DTSC to determine the level of community interest and conduct appropriate community outreach activities to inform the community of the project’s status.

From 1913 to about 1930 a manufactured gas plant operated at the site. This plant produced gas for the lighting, cooking and heating needs of local residents. The plant was dismantled when natural gas became available in Madera and the plant structures were removed from the site from 1931 to 1935. The site is currently used by PG&E as an open space storage facility and as a mobilization yard for PG&E field crews. The site is enclosed by a six foot high cyclone fence and screening and paved with asphalt and contains a small storage building.

Since 1986, several phases of site investigations have been conducted to determine if manufactured gas plant residues are present in soil and groundwater. These investigations have identified varying levels of polycyclic aromatic hydrocarbons (PAHs), total petroleum hydrocarbons (TPHs) and metals in soils at depths of up to 20 feet. PG&E has prepared a draft cleanup plan (called a draft Removal Action Workplan or RAW) for the site and DTSC is currently reviewing this plan. Prior to DTSC’s approval of the proposed cleanup plan, you will receive a fact sheet that provides a summary of the proposed cleanup and a 30-day public comment period will be held. Thank you for taking the time to complete and return the enclosed community survey. Please be sure to return it to me by May 17, 2010. If you have any questions regarding this project or the enclosed community survey, please contact me toll free at (866) 495-5651 (press 5 for MGP projects and press 1 for Christina Fu) or at (714) 484-5488, or by e-mail to [email protected] Sincerely,

Christina Fu, DTSC Public Participation Specialist

Printed on Recycled Paper

mailto:[email protected]�

of 3

Community Survey for the site located at 9th Street and South E Street, Madera, CA

Please return this community survey by May 17, 2010, in the enclosed, stamped envelope. Where more than one box is presented, please mark only one box.

1. Please mark your current knowledge about this site.

I do not know anything about this site. 3 I have heard about this site but have little or no information on it. 5 I know a lot about this site. 2

2. Please mark your interest in environmental investigations/cleanup at this site.

I do not know anything about this site and cannot tell you if I am interested or not. 3 I have no interest. I would not be interested in information about this site. I have some interest. I would be interested in hearing or reading more about this site. 4 I am very interested. I would read information mailed to me and talk to people about this site. 3

3. Please mark your willingness to attend a meeting regarding environmental activities at this

site.

I would not attend a meeting. 4 I might attend a meeting if it was convenient for me. 3 I would attend a meeting. 3

4. Please tell us how many times you have attended a public meeting on an issue that

concerns you?

Never 2 1-2 times 3-5 times 4 More than 5 times 3

5. Do you have a language preference for receiving information about this site?

English 9 Spanish 1 Other___________________

6. We want to tell you more about this site. What is the best way to give you information?

Printed material and/or letters. 7 By Email: What is your email? 3__________________________________________ Community meetings: When is the best time for you to attend? Daytime Evening Saturday

7. We sometimes need to talk with community members to learn more about the local

community perspective of the site. Would you be willing to talk with us?

No 5 Yes → How m ay we contact you? 5

8. Do you know of an active community group(s) or individual(s) in your neighborhood that we

should add to our mailing list? If so, please provide us with the following information:

Yes - 2 No - 8

Plumas Ranch Elementary School

of 3

9. Please feel free to add any other comments you may have about the site or public

participation.

Comment 1: “My property is next door to PG&E property.”

Comment 2: “I don’t know how my participation would help with this investigation.”

Comment 3: “Why are you wasting money on postage? Just clean it up.”

10. If you received this survey by hand-delivery or e-mail and would like to receive more

information regarding this Site, please complete the information below and we will add you to the site mailing list. By checking this box, you are requesting to be REMOVED

from the Site-specific mailing list. Please provide your name and address below for removal.

Appendix B

PG&E Former Madera Manufactured Gas Plant Key Contact List


B-1

Key Contact Mailing List

Name Title Affiliation Address City State Zip Code Phone

Federal &State Government George P. Radanovich Representative 19th U.S. Congressional District 1040 E. Herndon, Suite 201 Fresno CA 93720 (559) 449-2490 Rachel Arnow Field Representative 19th U.S. Congressional District Office 1040 E. Herndon, Suite 201 Fresno CA 93720 (559) 449-2490 Jackie Speier Representative 19th U.S. Congressional District Office 1040 E. Herndon, Suite 201 Fresno CA 93720 (559) 449-2490 Jeff Denham State Senator 12th California Senate District 1640 N Street, Ste. 210 Merced CA 95340 (209) 726-5495 Michelle Hunter Sr. Field Representative 12th California Senate District Office 1640 N Street, Ste. 210 Merced CA 95340 (209) 726-5495 Louise Farley Field Representative 12th California Senate District Office 1640 N Street, Ste. 210 Merced CA 95340 (209) 726-5495 Michael Villines State Assemblymember 19th California Assembly District 6245 N Fresno St., #106 Fresno CA 93710 (559) 446-2029

Ken May Field Representative 19th California Assembly District Office 6245 N Fresno St., #106 Fresno CA 93710 (559) 446-2029

Julie Griffiths District Director 19th California Assembly District Office 6245 N Fresno St., #106 Fresno CA 93710 (559) 446-2029

Kevin Shaddy Project Manager Calif. Dept. of Toxic Substances Control 1515 Tollhouse Road Clovis CA 93611 (559) 297-3929

Christina Fu Public Participation Specialist

Calif. Dept. of Toxic Substances Control 5796 Corporate Avenue Cypress CA 90630 (714) 484-5488

Mona Arteaga Bontty

Public Participation Supervisor

Calif. Dept. of Toxic Substances Control 5796 Corporate Avenue Cypress CA 90630 (714) 816-1978

Jong Han Caseworker Calif. Regional Water Quality Control Board 1685 E. Street Fresno CA 93706 (559) 488-4389

City Government Gary Svanda Mayor City of Madera 205 West Fourth Street Madera CA 93637 (559) 675-8535 Robert Poythress Mayor Pro Tem City of Madera 205 West Fourth Street Madera CA 93637 (559) 903-3370 Steven Mindt Councilmember City of Madera 205 West Fourth Street Madera CA 93637 (559) 661-5405 Sally Bomprezzi Councilmember City of Madera 205 West Fourth Street Madera CA 93637 (559) 474-7924 Sam Armentrout Councilmember City of Madera 205 West Fourth Street Madera CA 93637 (559) 661-5405 David Tooley City Administrator City of Madera 205 West Fourth Street Madera CA 93637 (559) 661-5405 Sonia Alvarez City Clerk City of Madera 206 West Fourth Street Madera CA 93637 (559) 661-5405 Richard Denhalter City Attorney City of Madera 203 West Fourth Street Madera CA 93637 (559) 661-5400 Jim Taubert Executive Director Madera Redevelopment Agency 5 East Yosemite Avenue Madera CA 93638 (559) 661-5110

Dave Merchen Community Development Director City of Madera 205 West Fourth Street Madera CA 93637 (559) 661-5430

Manuel Ruiz Neighborhool Revitalization Director City of Madera 5 East Yosemite Avenue Madera CA 93638 (559) 661-5115

Keith Helmuth City Engineer City of Madera 205 West Fourth Street Madera CA 93637 (559) 661-5418 Dave Randall Planning Director City of Madera 205 West Fourth Street Madera CA 93637 (559) 661-5434

Matt L. Bullis Public Works Operations Director City of Madera 1030 S. Gateway Drive Madera CA 93637 (559) 661-5466

Mary Anne Seay Community Services Director City of Madera 1030 S. Gateway Drive Madera CA 93637 (559) 661-5495

Michael B. Kime Chief of Police City of Madera 330 South C Street Madera CA 93638 (559) 675-4200 Dale Hutchinson Fire Chief City of Madera 14225 Road 28 Madera CA 93637 (559) 675-7799


B-2


County & Regional Government Steven D. Rodriguez

County Administrative Officer County of Madera 200 West 4th Street Madera CA 93637 (559) 675-7703

Rebecca Martinez County Clerk County of Madera 200 West 4th Street Madera CA 93637 (559) 675-7721 John P. Anderson Sheriff County of Madera 14143 Rd 28 Madera CA 93638 (559) 675-7770 Ronn Dominici Supervisor, District 3 County of Madera 200 West 4th Street Madera CA 93637 (559) 675-7700 Max Rodriguez Supervisor, District 4 County of Madera 200 West 4th Street Madera CA 93637 (559) 675-7700

Tanna G. Boyd Clerk of the Board of Supervisors County of Madera 200 West 4th Street Madera CA 93637 (559) 675-7700

Jill Yaeger Environmental Health Director County of Madera 2037 W. Cleveland Ave. MS-E Madera CA 93637 (559) 675-7823

Ann Rolan Sr. REHS - Environmental Health County of Madera 2037 W. Cleveland Ave. MS-E Madera CA 93637 (559) 675-7823

Carol Barney Public Heatth Director County of Madera 14215 Rd. 28 Madera CA 93638 (559) 675-7893 Michael R. Keitz District Attorney County of Madera 209 West Yosemite Avenue Madera CA 93637 (559) 675-7726

Bobby Kahn Executive Director Madera County EDC 2425 W. Cleveland Ave., Suite 101 Madera CA 93637 (559) 675-7768

Norman L. Allinder Planning Director County of Madera 2037 W. Cleveland Ave M.S. G Madera CA 93637 (559) 675-7821

Sally Bomprezzi Chair Madera County Community Action Agency 1225 Gill Avenue Madera CA 93637 (559) 673-9173

Linda Sitterding County Librarian Madera County Main Library 121 N. G Street Madera CA 93637 (559) 675-7871 Dr. Sally L. Frazier Superintendent of Schools Madera County School District 28123 Avenue 14 Madera CA 93638 (559) 673-6051 Tracie Scott‐Contreras

Workforce Development Officer Madera County School District 209 East 7th Street Madera CA 93638 (559) 662‐4587

Seyed Sadredin Air Pollution Control Officer San Joaquin Valley Air Pollution Control District 1990 E. Gettysburg Avenue Fresno CA 93726 (559) 230-6000

Organizations, Media, and other Interested Parties Jeremy Clar Chapter Chair Sierra Club - Tehipite Chapter P.O. Box 5396 Fresno CA 93755 (559) 681-0517 Melinda Marks Executive Officer San Joaquin River Conservancy 5469 East Olive Avenue Fresno CA 93727 (559) 253-7324 William Wattenbarger

Citizen Representative - Madera San Joaquin River Conservancy 5469 East Olive Avenue Fresno CA 93727 (559) 253-7324

Dr. Terry Kershaw Vice Chancellor State Center Community College 30277 Avenue 12 Madera CA 93638 (559) 675-4855 Debi Bray CEO/President Madera Chamber of Commerce 120 North E Street Madera CA 93638 (559) 673-3563

Carlos Padilla Madera Hispanic Chamber of Commerce 123 North D Street Madera CA 93638

Rochelle Noblett Madera Downtown Association 124 S C Street Madera CA 93638 (559) 673-5951 David Cantu President Madera Evening Lions Club 1625 Howard Road Madera CA 93637 Mike Herder President Madera Rotary Club P.O. Box 135 Madera CA 93639

John Rieping Local News Editor Madera Tribune P.O. Box 269 Madera CA 93637 (559) 674-8134, ext 222

Tami Jo Nix Staff Writer Madera Tribune P.O. Box 269 Madera CA 93637 (559) 674-8134, ext 231

Jerry Holiday Manager Holidays Auto 123 East 9th Street Madera CA 93638 (559) 674-4316 Miguel Aguilar 114 Clinton Street Madera CA 93638 (559) 232-9428

Mona Bontty Public Participation Specialist

Department of Toxic Substances Control 5796 Corporate Avenue Cypress CA 90630

(714) 484-5488

Kevin Shaddy DTSC Project Manager Department of Toxic Substances 1515 Tollhouse Road Clovis CA 93611- (559) 297-3929


B-3


Control 0522

Patricia Sullivan Project Manager PG&E Environmental Remediation Dept.

3401 Crow Canyon Rd., MS 177-C San Ramon CA 94583 (925) 415-6332

Darrell Klingman Portfolio Manager PG&E Environmental Remediation Dept.

3401 Crow Canyon Rd., MS 177-B San Ramon CA 94583 (925) 415-6321

Tracy Craig Communications Manager Craig Communications 2915 Doidge Ave. Pinole CA 94564 (510) 222-8469

AECOM 714.567-2400 Tel 999 W. Town and Country Road 714.689.7351 Fax Orange, California 92868 www.aecom.com

September 9, 2011

Mr. Jeff Gymer. Department of Toxic Substances Control 1515 Tollhouse Road Clovis, California 93611 RE: Letter Workplan

Additional Soil Sampling Former Madera Manufactured Gas Plant Site Madera, California Dear Mr. Gymer: On behalf of the Pacific Gas and Electric Company (PG&E), AECOM Technical Services, Inc. (AECOM) prepared this brief letter Workplan to conduct additional soil sampling in offsite areas adjacent to the former Madera Manufactured Gas Plant Site (Site). This Workplan is prepared as a follow-up to our teleconference on September 8, 2011. As we discussed during our teleconference, arsenic concentrations along the western and northern excavation walls adjacent to the Site exceed the initial excavation target level of 16 milligram per kilogram (mg/kg). As such, additional investigation of the extent of the arsenic in the areas north and west of the Site, within the city of Madera’s right-of-way (ROW) along 8th (Clinton) Street and South E Street, is recommended. The investigation plan is summarized as follows:

Five hand auger soil borings to a depth of 5 feet below ground surface (bgs) are planned parallel to and 10 feet west of the property line in South E Street; and

Five hand auger soil borings to a depth of 5 feet bgs are planned parallel to and 5 feet north of the curb line in 8th (Clinton) Street.

The soil borings will be approximately 20 feet to 25 feet apart, as shown on the attached Figure 1. Soil samples will be collected at 2 feet, 3.5 feet, and 5 feet bgs and analyzed for arsenic. Soil sampling, handling, and analysis will be conducted in accordance with the procedures specified in the Remedial Investigation Workplan (MSE/Earth Tech Team, February 2007).

The results of the sampling and analysis will help to determine if additional soil removal is warranted in the offsite areas northwest of the Site within the City’s ROW. Please note that implementation of this Workplan and any potential soil

Mr. Jeff Gymer Department of Toxic Substances Control Board September 9, 2011 Page 2

removal in the offsite areas will ultimately depend on the consent of the city of Madera. Concluding Remarks We trust that this letter Workplan provides satisfactory description for the recommended investigation in the offsite areas of the Site, as discussed during our September 8th conference call. Please do not hesitate to call Essi Esmaili at 714-689-7284 if you have any questions regarding this letter.

Sincerely,

E. Essi Esmaili, Ph. D., P.G., C.HG. Senior Program Director

Attachment: Figure 1

cc: Ms. Betsy Brunswick, PG&E Mr. Darrell Klingman, PG&E Ms. Maribeth Webber, Southern California Gas Company

A B C

1

2

3

4

5ExistingStorageBuilding Residential

RadiatorShop

Cov

ered

8th Street (Clinton St)

9th Street

South "E" Street

Alley

1

3

9

4

6

5

7

8

2

MW-MAD-3 MW-MAD-6

MW-MAD-4

MW-MAD-2

MW-MAD-5

MW-MAD-1

A4-HA1

A5-HA1

A5-HA2

A5-HA3

A5-HA5 B5-HA2A5-HA6 A5-HA7 B5-HA1

A5-HA4

30 FEET

APPOXIMATE SCALE

0 15

LEGENDEXCAVATION AREA DESIGNATION





REMEDIAL AREA FOR ARSENIC CONTAMINATION

FIGURE 1

PROPOSED SOIL BORINGFOR ARSENICDELINEATION

LOCATION MAPFORMER MADERA MGP SITE

MADERA, CALIFORNIADATE: SEPTEMBER 2011

5PROPOSED BORING LOCATIONS FOR ARSENIC DELINEATION

CURRENT EXCAVATION EXTENTS

A5-HA1

ABANDONED MONITORING WELL LOCATIONSMW-MAD-1

MONITORING WELL LOCATIONSMW-MAD-5