corrective action plan ver 8 · in previous investigations. the 151 south champlain street site has...

HINSDALE PROPERTIES

Burlington, Vermont

REVISED CORRECTIVE ACTION PLAN 151 SOUTH CHAMPLAIN STREET

VDEC SITE # 2003-3098 RAF# 05002

December 19, 2008

HEINDEL AND NOYES

Consulting Hydrogeologists, Engineers and Environmental Scientists

HINSDALE PROPERTIES Burlington, Vermont

REVISED CORRECTIVE ACTION PLAN 151 SOUTH CHAMPLAIN STREET

VDEC SITE # 2003-3098 RAF# 05002

Prepared by:

Heindel & Noyes Burlington, Vermont

Engineering Review by: Bernard Chenette, P.E.

Prepared for: Mr. Clark W. Hinsdale, Jr. Estate Burlington, Vermont

December 19, 2008

i

Executive Summary/Public Notice The following Revised Corrective Action Plan (RCAP) has been compiled to address public comment received regarding the Vermont Department of Environmental Conservation (VDEC) approved Corrective Action Plan dated September 13, 2007. The revisions contained herein details specific responses to the public comments and subsequent negotiated changes. This RCAP provides a clear record of the final agreed upon methods for proceeding with Site activities. Heindel & Noyes (H&N) was contracted by Clark W. Hinsdale, Jr. to complete development of a Corrective Action Plan (CAP) for contaminants associated with his 151 South Champlain Street property in Burlington Vermont. The contamination was discovered during Phase I and II Environmental Site Assessments performed as part of a real estate transaction involving the owner of 151 South Champlain Street, Clark W. Hinsdale, Jr. and the City of Burlington Community and Economic Development Office (CEDO). The property is generally located on Figure 1 and a detailed site plan is included as Plan Sheet 1. The property is currently used for residential and commercial use. Likely redevelopment will remove the commercial building and replace it with a residential structure. Contaminants found on the 151 South Champlain Street property which require performance of corrective actions include volatile organic compounds (VOC), polycyclic aromatic hydrocarbons (PAH) and several heavy metals (Mercury, Arsenic and Lead). The VOC contamination likely originates from the use of the property as a dry cleaner in the middle of the last century. The PAH and metals contamination are attributed to the use of a neighboring property, 157 South Champlain Street, for many years as a radiator repair shop. Contamination on the 157 South Champlain Street property has previously been remediated and the Vermont Department of Environmental Conservation (VDEC) has issued a Site Management Activities Completed (SMAC) designation for the property. Prior to the present industrial use of the heavy metal and PAH contaminated portion of the 151 South Champlain Street property being changed, additional corrective action measures may be required by the VDEC. The extent, degree and risk posed by the VOC contamination associated with the 151 South Champlain Street property have been investigated in detail since 2002. The investigations have involved collection and analyses of soil gas, soil and ground water samples, and installation of monitoring wells from the subject property to the south and west to near Lake Champlain. Investigation of the impact of contaminated soil gas on indoor air quality in buildings over the contaminated ground water plume has also been performed. The investigation data indicate that the primary contaminants emanating from the 151 South Champlain Street property are dry cleaning and degreasing solvents

ii

tetrachloroethene (PCE) and trichloroethene (TCE). The indoor air quality of the 151 South Champlain Street property and several buildings adjacent to the Site on Battery, King and Main Streets may have PCE concentrations above VDEC guidance levels for residential occupation due to the 151 South Champlain Street release. The Revised Corrective Action Plan details installation, operation, efficacy evaluation and monitoring of sub slab vapor intrusion mitigation systems in several of the buildings with indoor air PCE concentrations above the EPA and VDOH guidance levels, further definition of contaminant presence on several specific properties and notices to land records for properties which have 151 South Champlain Street related ground water contamination beneath them. These actions will determine if the PCE in the indoor air spaces off the 151 South Champlain Street property are representative of “background” conditions or the 151 South Champlain Street release; determine the efficacy of sub slab vapor intrusion mitigation systems; and ensure that any changes of use, construction or redevelopment of properties atop the identified contaminated area are reviewed and approved by the VDEC. Continued monitoring, maintenance and reporting on the soil gas mitigation systems and ground water conditions to the VDEC will document site progress and cleanup.

iii

Table of Contents

Executive Summary/Public Notice ..................................................................... i 1.0 Site History and Summary of Investigations .........................................1

1.1 Site Use History........................................................................................1 1.2 Site Setting ...............................................................................................2 1.3 Site Investigation History ........................................................................2 1.4 Geologic Setting.......................................................................................6 1.5 Hydrogeologic Setting .............................................................................8

2.0 Contaminant Distribution ........................................................................9 2.1 Extent and Degree of Contamination .....................................................9

2.1.1 Soil Gas Contamination ................................................................9 2.1.2 Adsorbed Contamination............................................................10 2.1.3 Ground Water Contamination.....................................................13 2.1.4 Ambient Indoor Air Contamination ............................................15

3.0 Conceptual Contaminant Model ...........................................................17 4.0 Receptor Pathway Analysis ..................................................................19

4.1 Ambient Indoor Air.................................................................................20 4.2 Utility Corridors......................................................................................21

5.0 Corrective Action Goal ..........................................................................21 5.1 Phase I – Vapor Mitigation/Monitoring System Installations, Notice to

Land Records and Additional Subsurface Investigation ....................22 5.2 Phase II – Short-Term Vapor Mitigation System Efficacy, Soil Gas

Intrusion, and Ground Water Quality Monitoring and Reporting ......22 5.3 Phase III - Long Term Operations and Management ...........................24

6.0 Proposed Corrective Actions................................................................24 6.1 Phase I -Vapor Mitigation/Monitoring System Installations, Notice to

Land Records and Additional Subsurface Investigation ....................24 6.1.1 Vapor Mitigation System Installation ..............................................24

6.1.1.1 151 South Champlain Street - Blinn House........................29 6.1.1.2 156 Battery Street.................................................................30 6.1.1.3 162 Battery Street.................................................................31 6.1.1.4 164 Battery Street.................................................................32

6.1.2 Contaminated Soil Vapor Intrusion Confirmation Monitoring 33 6.1.2.2 40 King Street .......................................................................34 6.1.2.3 168 Battery Street.................................................................34 6.1.2.4 174 Battery Street.................................................................35

6.1.3 Notices to Land Records ............................................................35 6.1.3.1 151 South Champlain Street................................................35 6.1.3.2 Ground Water and Soil Impacted >10 Feet Below Grade..36 6.1.3.3 Ground Water and Soil Impacted > 5 Feet Below Grade...37 6.1.3.4 Ground Water and Soil Impacted <5 Feet Below Grade....37

6.1.4 Additional Subsurface Investigation .........................................37 6.1.4.1 Soil Gas Sampling................................................................37 6.1.4.2 Soil Sampling........................................................................38 6.1.4.3 Groundwater Monitoring Well Installation and Sampling 39

iv

6.1.4.4 Waste Disposal.....................................................................40 6.1.4.5 Site Survey............................................................................40

6.2 Phase II – Short-Term Vapor Mitigation System Efficacy, Soil Gas Intrusion, and Ground Water Quality Monitoring and Reporting .......40

6.2.1 Soil Gas Intrusion Mitigation System Monitoring.....................41 6.2.1.1 151 South Champlain Street – Blinn House ................41 6.2.1.2 Soil Gas Impacted Properties..............................................42

6.2.2 Sub Slab Soil Gas Monitoring Properties.............................43 6.2.3 Indoor Air Sampling ....................................................................43 6.2.4 Ground Water Sampling .............................................................44 6.2.5 Reporting .....................................................................................45

6.2.5.1 Additional Subsurface Investigation Report......................45 6.2.5.2 As-Built Report .....................................................................45 6.2.5.3 Phase II – Corrective Action Report ...................................45

6.3 Long Term Operations and Management Plan ....................................47 7.0 Revised Corrective Action Plan Implementation.................................47

7.1 Permits ....................................................................................................48 7.2 Subcontractors.......................................................................................49 7.3 Health and Safety Plan...........................................................................49 7.4 List of Interested Parties .......................................................................49 7.5 Hazardous and Solid Waste ..................................................................49

8.0 Cost Estimate .........................................................................................50

v

List of Attachments Table 1 ................................................................................... Ground Water Elevations Table 2 ...........................................Soil Gas and Well Headspace Air Sample Results Table 3 ......................................Monitoring Well Headspace Photoionization Results Table 4 ..................................................Field GC and Laboratory Soil Quality Results Table 5 ........................................................................... Ground Water Quality Results Table 6 ......................................................... Indoor Air Quality Data EPA Method TO2 Figure 1........................................................................................General Location Map Figure 2................................... Active Sub Slab Depressurization System Schematic Figure 3....................................................... Revised Corrective Action Plan Schedule Plan Sheet 1 ...............................................................Site Plan with Ground Contours Plan Sheet 2 ......................................................................Silty Clay Surface Contours Plan Sheet 3 .....................................................................Cross Section Location Map Plan Sheet 4 ................................. Cross Sections A-A’ & B-B’ with Soil Quality Data Plan Sheet 5 ...................................Cross Sections C-C’ – F-F’ with Soil Quality Data Plan Sheet 6 ..................... Ground Water Elevation Contour Map for August 2, 2005 Plan Sheet 7 ............................ Soil Gas& Ambient Indoor Air Quality Summary Map Plan Sheet 8 .................................. Dissolved PCE Summary Map for August 2, 2005 Plan Sheet 9 .........Dissolved TCE and Petroleum Summary Map for August 2, 2005 Plan Sheet 10 ...... Proposed Additional Subsurface Investigation Boring Locations Appendix 1 .........................................................................................ASTM E 2121 – 03

Standard Practice for Installing Radon Mitigation Systems in Existing Low-Rise Residential Buildings

Appendix 2 ..............Sub Slab Depressurization System Component Specifications Appendix 3 ................. Blinn House Sub Slab Depressurization System Component

Specifications Appendix 4 .............................................................................Notices to Land Records Appendix 5 ............................................................................ Potential Subcontractors Appendix 6 ................................................................................ Health and Safety Plan Appendix 7 ............................................................... List of Affected Property Owners Appendix 8 ......................................... Revised Corrective Action Plan Cost Estimate

HINSDALE PROPERTIES – 151 SOUTH CHAMPLAIN STREET – REVISED CORRECTIVE ACTION PLAN

1

1.0 Site History and Summary of Investigations The 151 South Champlain Street Site (Site) is located in the heart of Burlington, Vermont’s historic downtown/waterfront district. A general location map is included as Figure 1. A detailed Site map showing important features and investigation test locations is included as Plan Sheet 1. A number of investigations have been performed to date by various consultants for a number of entities. At this time the property owner, Hinsdale Properties, has selected Heindel and Noyes, Inc.(H&N) to submit and this Revised Corrective Action Plan (RRCAP). 1.1 Site Use History

The subject Site contains two buildings, a brick 3-story residential structure (Blinn House), and a wood framed automotive repair barn as shown on Plan Sheet 1. The subject parcel surrounds the adjoining 157 South Champlain Street property which is currently unoccupied with a small 1-story structure. The subject Site and immediately adjoining properties have been utilized for residential and commercial uses since early in the 20th century. Property uses on and/or adjacent to the Site include: automotive storage and repair, machine shop, blacksmith, automotive painting and printing industries. Lincoln Applied Geology, Inc. (LAG) performed research of Manning’s Telephone Indexes and historic maps at the University of Vermont (UVM) Special Collections Library to further define Site and neighboring property uses. The research revealed many uses consistent with those presented in previous investigations. The 151 South Champlain Street Site has been utilized as a residential structure and intermittently as a commercial business throughout its history. Of particular note is the use of the property for the Holland Furnace Company from 1949 through 1956, and as the Park Cleaners in 1958. These uses coupled with the more recent use as an auto repair facility, provide a number of potential sources for the chlorinated solvent contamination identified beneath this Site. Review of historic maps and other documents regarding the Battery Street area indicate that the 151 South Champlain Street apartment building originally had an additional wing on the west side of the building. This section of the building was reportedly used as a privy. Relic foundation blocks are


2

evident at the ground surface in the area and outline the footprint of the privy. Neighboring property uses which likely also used chlorinated solvents include: auto paint and repair shops at 55, 61 and 65 Main Street from pre-1948 through 1980's; 157 South Champlain Street's use a radiator repair shop from pre-1948 through 1964; and utilization of 21 and 35 King Street as Carpenter's Motor Transport and a private garage for more than 30 years beginning in the early 1940's. This information clearly indicates that potential chlorinated solvent users were located adjacent to the subject property.

1.2 Site Setting

The Site is located in an urban downtown environment of mixed residential and commercial uses. Multiple development and redevelopment activities have occurred particularly along King Street and Main Street during the past 50 years. The current alignment and location of occupied buildings, shown on Plan Sheet 1, has been relatively consistent for the past 30 years. Previously a railroad spur and a number of buildings existed in the current parking areas between the 151 South Champlain Street and the buildings currently located along Battery Street. The Site resides on the west sloping embankment leading to Lake Champlain. Ground contours through the Site are generally uniformly sloping from east to west, approximately 15 feet from South Champlain Street to Battery Street. On the western side of Battery Street another 15 foot of elevation drop occurs within 25 feet of horizontal distance. From the west side of Battery Street to Lake Champlain is relatively flat with only 2 to 3 feet of elevation change. Plan Sheet 1 includes ground elevation contours throughout the area investigated. 1.3 Site Investigation History As part of a real estate transaction, the owner of the 151 South Champlain Street property (Site), Clark W. Hinsdale, Jr., and the City of Burlington


3

Community and Economic Development Office (CEDO) were negotiating a purchase and sales agreement. As part of these negotiations a Phase I Environmental Site Assessment was performed on the Site by ATC Associates, Inc. (ATC) in August 2002. The Phase I Environmental Site Assessment report identified soil and ground water contamination by volatile organic hydrocarbons (VOCs), polycyclic aromatic hydrocarbons (PAHs), and heavy metals associated with the 157 South Champlain Street property existed on the subject property. An additional potential contaminant source was identified on the Site due to poor housekeeping and storage of oil and other auto repair fluids in the auto repair facility. ATC performed a site investigation and produced a Phase II Site Investigation Report for 151 & 157 South Champlain Street in January 2003. The investigation included installation of numerous soil borings, and 3 permanent monitoring wells. Analytic testing of soil and ground water samples for metals, polychlorinated biphenyls (PCBs) total petroleum hydrocarbon (TPH) gasoline range organics (GRO), VOC, and PAH related compounds was performed. Shallow soil samples contained VOCs [trichloroethene (TCE)], PAHs, and several metals in concentrations exceeding the Environmental Protection Agency Region IX Preliminary Remediation Goals (PRGs). Ground water samples indicated the presence of the chlorinated VOC tetrachloroethene (PCE) at concentrations above the Vermont Groundwater Quality Enforcement Standard (GQES). Recommendations included: developing a soil handling plan for Site redevelopment; installing a barrier beneath clean fill to limit physical contact with contaminated surface soils; further delineation of the ground water contaminant plume; and recording a deed notice to the land records documenting the presence of contaminants beneath the Site. ATC developed a Corrective Action Plan (CAP) for CEDO for the redevelopment of the Site in April 2003. The CAP addressed a redevelopment plan by King Street Neighborhood Redevelopment Corporation (KSNRC). The redevelopment plan entailed demolition of the existing auto repair facility and replacement with a new residential building. The RRCAP detailed methods of eliminating contact with contaminated near surface soil through paving and excavation/barrier


4

placement/clean fill cover placement. Indoor air quality within the new building would be protected through the use of an engineered vapor barrier and sub slab venting system. The Blinn House would have a sub slab venting system installed if indoor air sampling indicted intrusion of contaminant vapors. The CAP was approved by the VDEC in May of 2003. At present, KSNRC is not moving forward with property acquisition and redevelopment. Therefore, this CAP has been developed assuming current property uses. At the request of the VDEC and on behalf of CEDO, ATC performed a detailed soil gas survey of 11 temporary sampling points installed throughout the Site in June 2003. The soil gas was analyzed via field gas chromatographic techniques for the presence of VOCs. Confirmatory laboratory analyses were also performed at two sample locations. The collected data indicated PCE and TCE vapors were present in the shallow soil gas less than 5’ below grade at concentrations exceeding 5 parts per million volume/volume (ppm v/v). Quantifiable concentrations of PCE were reported throughout the entire western portion of the Site. The indoor air of the basement apartment in the Blinn House was sampled in October 2003 by New England Air Quality Testing (NEAQT) and analyzed for the presence of VOCs. PCE was quantified at concentrations 130 times the EPA Region III Risk Based Concentration (RBC) for residential exposure. The tenant was subsequently moved from the apartment. The apartment remains unoccupied. H&N performed a supplemental Phase II investigation in October 2004. A total of 14 soil borings were installed. Six of the soil borings were converted to monitoring wells and 8 were completed as soil gas monitoring points. Soil gas and ground water sample analyses indicated a near surface PCE contaminant source area existed beneath the Blinn House. The dissolved phase PCE plume in ground water was found to extend westward across the Site, through the 51-53 Main Street property and onto adjoining Battery Street properties. A petroleum related ground water plume was also identified in the west-northwest portion of the investigation area. The source of the petroleum contamination does not appear to be related to the Site. The extent of the PCE and petroleum


5

plumes was not determined. H&Ns Supplemental Phase II Environmental Site Assessment Report, December 10, 2004 presents and discusses the data collected, recommends additional plume delineation, and puts forth conceptual remedial options. Due to the nature of PCE and the multilayered soils, H&N felt active remediation of the source area(s) would be difficult and expensive. Since the Site is located in an urban setting with relatively low risk of subsurface contaminant contact H&N recommended managing the risks posed by the contaminants through control of soil gas intrusion to indoor air space, notices to land records for all impacted properties and long term contaminant plume monitoring. LAG performed additional investigation of the degree and extent of soil gas, soil, ground water and indoor air VOC contamination on and off the 151 South Champlain Street property under a VDEC contract for Targeted Brownfields Assessments. The Phase II Supplemental Subsurface Investigation Report, December 2, 2005 detailed the results of the investigation and included conceptual remediation methods. The investigation refined the vertical and horizontal extent of 151 South Champlain Street related contamination in the soil, soil gas, ground water and indoor air on and downgradient of the property. Additional information regarding petroleum related contamination in the northwest portion of the investigation area was also collected. The petroleum contamination continues to be related to an undefined source away from the 151 South Champlain Street property. The dissolved PCE plume was defined as far west as 100 feet from Lake Champlain. Indoor air samples were collected from thirteen downgradient buildings “lowest floor” (basement, or ground floor for slab on grade construction) on two occasions. PCE concentrations above the RBC were observed in all of the buildings located directly above the dissolved phase plume. A conceptual contaminant model was presented upon which relative risks and conceptual remedial methods were developed. Recommended remedial methods included vapor intrusion abatement systems for all buildings containing PCE above guidance concentrations, notices to land records for all PCE impacted properties, utilization of engineered vapor barriers for newly constructed buildings and long term monitoring and reporting.


6

At the request of the VDEC, LAG conducted an additional ambient indoor air sampling event of all previously sampled buildings for Hinsdale in February 2006. This sampling event was performed to determine the degree of temporal fluctuations in PCE concentration due to the winter heating season. Samples were collected from the basement (if present) and the first floor of each building. The collected data presented in LAGs Supplemental Indoor Air Quality Monitoring Report, May 15, 2006 indicated a general decrease in VOC concentrations at previously sampled locations within each building. The first floor contaminant concentrations were generally lower than the basement concentrations. However, a number of the buildings sampled continued to report indoor air concentrations of PCE greater than the RBC and/or the Vermont Department of Health (VDH), Vermont Indoor Ambient Air Quality Survey, June 1993 median concentrations. H&N generated a CAP in September 2007 detailing installation of soil vapor intrusion mitigation systems at several buildings, installation of soil vapor monitoring systems in several additional buildings, placement of notices to the land records and long term monitoring and operation protocols. This CAP was accepted by the VDEC and a public comment sought. This RCAP has been generated to address the public comments and provide a comprehensive document summarizing all of the agreed upon remedial actions to be performed. 1.4 Geologic Setting The surficial geologic map of Vermont by Dole (1970), and subsurface investigations identify the soils beneath the Site as marine sands associated with deposition from the Champlain Sea. The interbedded fine and silty sands are underlain by a marine deposited silty clay. No bedrock outcrops are identified near the Site and bedrock was not encountered during any subsurface investigation on or nearby the Site. Regionally, bedrock outcrops are seen to the north and south of the Site along the Lake Champlain border. The area surrounding the subject Site appears to represent a trough in the bedrock surface. This has allowed for deposition of a significant thickness of silt and silty clays beneath the inter-bedded fine sands.


7

The Site is generally underlain by a thin veneer of a fill deposited atop a medium to coarse sand. A dense silty fine sand is then encountered which contains interbeds of medium to fine sand to depths of 14 to 32 feet below grade. This interbedded dense silty sand is underlain by a marine deposited silty clay. In the lowest 5 feet of the interbedded silty sand material, significant iron banding of thin, medium to coarse sand lenses is observed. These iron banded areas are several feet below the average ground water level surface. The silty clay appears to be a significant hydraulic boundary and may be a permeability boundary for the vertical migration of chlorinated solvents. If dense nonaqueous phase liquids (DNAPL) were released in the Site area, they could potentially flow along the surface of this silty clay layer in directions counter to ground water. Plan Sheet 2 shows the contour of the surface of the silty clay. Generally, the silty clay surface contours slope from northeast to southwest at an average slope of 2.6%, or .026 feet/foot. The slope becomes markedly steeper between the 151 South Champlain Street property boundary and the King Street/Battery Street intersection. The silty clay surface slope in this region is .044 feet/foot. An area of significantly less slope is seen beneath Battery Street. The silty clay surface slope increases once again towards the Lake to 0.10 feet/foot (10%) from the Battery Street “plateau” to the western edge of the investigation area. The mildly undulating slope is typical of a marine deposited silty clay surface which has undergone some erosion prior to the deposition of materials atop it. The silty clay surface contours indicate that potential DNAPL migration from the subject Site would be towards Lake Champlain, generally paralleling ground water flow. Soil boring data coupled with elevation data derived from a Site survey, were used to develop 6 cross sectional representations of the subsurface environment. The locations of cross sections A-A'; B-B'; C-C'; D-D'; E-E' and F-F' are shown on Plan Sheet 3. The individual geologic cross sections are enclosed as Plan Sheets 4 and 5.


8

Cross section A-A' passes through the subject Site due west to Battery Street and then southwest towards Lake Champlain generally perpendicular to surface contours. Cross section B-B' passes from the subject Site directly southwest more closely following the slope of the silty clay contour. These cross sections show the undulating slope of the silty clay. The A-A' and B-B' cross sections show how the medium to coarse sand layer is pinched off and essentially nonexistent at the western most portion of the study area adjacent to Lake Champlain. This area has been heavily industrialized over the past century and contains a significant amount of wood chips and fill associated with lumber and railroad industry uses. The fill materials appear to have been placed directly atop the silty clays throughout much of the area to create the waterfront currently depicted. Cross sections C-C', D-D', E-E' and F-F' are aligned north to south parallel to ground contour and represent soils directly beneath the Site and at various distances downgradient through the study area. Review of the cross sections shows the silty clay surface tipping slightly to the south and its undulating surface. 1.5 Hydrogeologic Setting On August 2, 2005, LAG monitored ground water levels in all of the monitoring wells associated with the Site. These data were then utilized to determine relative ground water elevations and contours. Table 1 presents a summary of ground water elevation data collected throughout the Site’s history. Ground water elevations are generally 13 to 15 below grade in the eastern portion of the Site and decrease to 5 feet below grade along the Lake Champlain waterfront area to the west. Ground water levels measured in the preexisting wells in August 2005 are similar to those reported in 2004 and 1.0 to 2.5 feet higher than those in January 2003. The ground water elevation data collected on August 2, 2005 was utilized to generate the Ground Water Contour Map presented as Plan Sheet 6. Ground water contours generally mimic the contours of the silty clay surface and slope from east to west. A relatively flat gradient of 0.036


9

feet/foot exists beneath the 151 South Champlain Street property. From the area just west of the subject property, ground water slope increases significantly and averages 0.057 feet/foot. West of Battery Street the ground water slope flattens considerably to 0.011 feet/foot in response to the impact of Lake Champlain. Ground water flow directions indicated on Plan Sheet 6 show a radial flow pattern away from 151 South Champlain Street with a component towards the south adjacent to King Street. The presence of a significant ground water flow direction shift towards the south in the King Street area has resulted in the bifurcation of the PCE plume.

2.0 Contaminant Distribution Extensive descriptions of the vertical and horizontal extent and degree of contaminants identified during the various Site investigations have been included within individual reports. LAG's 2005 Phase II report has been utilized as a basis to represent current contaminant conditions on the Site as it is the most comprehensive evaluation of all phases of contamination across the entire contaminant plume.

2.1 Extent and Degree of Contamination 2.1.1 Soil Gas Contamination

All soil gas data collected to date is summarized on Table 2. Table 2 reports only those compounds which have been quantified on at least one occasion. The areal extent and degree of PCE in soil gas is shown on Plan Sheet 7. Review of the data indicates the presence of PCE in SG-8 and SG-9 at 9,701 micrograms per cubic meter (ug/m3) and 209 ug/m3 respectively. These sample locations are located directly atop the heart of the H&N identified PCE source area on 151 South Champlain Street and approximately 200 feet downgradient. Comparison of the LAG derived data with previously collected soil gas analyses results presented by H&N and ATC shows a significant apparent reduction in VOC concentrations throughout the 151 South Champlain Street property. The areal extent of PCE related soil gas contamination is isolated to directly


10

atop the most highly contaminated portions of the dissolved phase plume in areas with dissolved PCE concentrations greater than 1,000 ppb (discussed in 2.1.3). TCE was also identified in SG-8 and SG-9 at 1.34 and 5.57 ug/m3 respectively. A number of petroleum related compounds were identified in SG-8, SG-9 and SG-11 at concentrations between 0.71 and 50.49 ug/m3. Monitoring well headspaces were assayed with a PID prior to initiating ground water quality sampling on August 2, 2005. The data are summarized on Table 3 and indicates readings greater than 1 part per million in benzene equivalents (ppm) in MW-11, MW-107, MW-109, MW-110 and MW-113. These wells are generally associated with elevated levels of dissolved phase PCE and TCE on and downgradient of the Site. The PID assay results are likely indicative of compounds "off gassing" from the ground water. Field gas chromatograph (FGC) measured soil gas and soil quality results do not indicate vadose zone contamination outside the immediate vicinity of the Blinn House. 2.1.2 Adsorbed Contamination Soil analyses results are compiled for each soil boring and depth sampled on Table 4. FGC analyses reported PCE, TCE and cis-1,2 DCE. The laboratory data reports EPA Method 8260 quantifiable compounds. PCE and/or TCE were identified in 29 of the 39 soil boring locations. PCE concentrations ranged from slightly greater than the FGC detection limit of 5 parts per billion (ppb; ug/kg) to 13,100 ppb. PCE was found with anaerobic breakdown products TCE and cis-1,2 DCE at many of the locations having detectable concentrations of contaminants. The soil contaminant data has been superimposed on geologic cross sections A-A' through F-F'. PCE concentration isocontours


11

have also been applied to the cross sections. The cross sections with PCE concentrations and isocontours are included as Plan Sheets 4 and 5. Review of cross sections A-A' and B-B' show adsorbed PCE concentrations near the ground surface surrounding the Blinn House and migrating vertically to and below the saturated surface of the dense silty fine sands. The isoconcentration contours describe a contaminated zone of soils directly associated with the iron banded sand lenses and permeability boundary of the dense silty fine sand and gray silty clay. The highest concentrations of PCE seen in soils are located along cross section A-A' at SB-40 directly beneath and slightly east of Battery Street. Cross section B-B' shows the highest level of contaminants on the west side of Battery Street in SB-45 with an additional "hot spot" to the northeast of the King Street/Battery Street intersection in SB-29. The distribution of adsorbed contaminants on cross section B-B' appears to indicate some degree of bifurcation of the contaminant plume as it migrates along the gray silty clay surface and in the iron banded sand lenses. Cross section C-C' shows near surface contaminant concentrations associated with the area immediately downgradient of the Blinn House. Note that the PCE concentrations for SB-11 were obtained during a previous subsurface investigation. These concentrations have been included as they assist in filling a data gap between SB-22 and SB-51. Cross section D-D' runs perpendicular to cross section A-A' and B-B' just west of the subject property. PCE isoconcentrations clearly show the bifurcation of the plume, with much of the identified adsorbed contamination below the ground water surface. The lateral spreading of the two lobes of the contaminant plume is apparent in cross section E-E'. The most highly contaminated soils continue to be associated with the iron banded coarse sands. The


12

lateral spreading of the contaminant plume may be associated with the slightly flatter slope of the sand lenses and clay surface identified in the Battery Street area (Plan Sheet 2). Although depicted as two separate PCE plumes, the contaminant distribution in the E-E' cross section may be one continuous plume. Cross section F-F' shows a clearly bifurcated plume with significantly decreased PCE concentrations. Also shown on cross section F-F' is a near surface lobe of PCE contamination associated with SB-53. The presence of chlorinated contaminants in the 0 to 10 foot soil samples is indicative of a small scale surface source somewhere near or slightly upgradient of this location. The PCE concentrations identified in SB-47 and SB-48 and the separate lobe at SB-54 are located at vertical and horizontal locations consistent with being an extension of the PCE plume emanating from 151 South Champlain Street. The PCE identified in SB-47, SB-48 and SB-54 is clearly isolated and from a different source than the near surface source at location SB-53. The full downgradient extent of PCE associated with the 151 South Champlain Street plume is not identified by the current soil boring array. Additional VOCs were also identified in soil by confirmatory EPA 8260 laboratory analysis results. Compounds identified in the soil samples include; Benzene, Toluene, Ethyl benzene, Xylenes,1,2,4 Trimethylbenzene (TMB), 1,3,5 TMB, Naphthalene, n-Butyl benzene, sec-Butylbenzene, tert-Butylbenzene, Isopropylbenzene, p-Isopropyltoluene and n-Propylbenzene. All of these non chlorinated, substituted benzene compounds are associated with petroleum products such as gasoline, #2 and #4 fuel oil. Many of these compounds were also identified in soil samples obtained during previous subsurface investigations (see page 1 of Table 1). Contaminant concentrations for the petroleum related compounds were predominately less than 100 ppb. However, one sample from SB-40 did report concentrations of petroleum related compounds upwards to 100,000 ppb from a depth of 17 to 18 feet below ground surface. This sample also contained the highest concentration of


13

PCE identified by H&N. Due to the historic property uses and gravel parking lots throughout the area, the presence of petroleum related contaminants is not unexpected. Potential historic uses which could provide a source for the identified petroleum related contamination include the former underground storage tank located at 51-53 Main Street, auto paint and repair at 55 and 61 Main Street. Petroleum related contaminant releases throughout the gravel parking lots. Petroleum related releases and injection to the subsurface near the storm drain at 151 South Champlain Street and co-solvent migration of petroleum contaminated waste PCE being discharged at the subject Site. 2.1.3 Ground Water Contamination Ground water sampling data are summarized in Table 5 along with ground water quality data available from previous investigations. The selected compounds reported in Table 5 represent the suite of compounds quantified on-Site during any previous water quality sampling event. Dissolved PCE concentrations range from non-detect to 2,400 ppb (ug/l). PCE concentrations at or above the VDEC GQES of 5ppb were measured in MW-11, MW-12, MW-102, MW-103R, MW-104R, MW-106R, MW-107, MW-108, MW-111, MW-112, and MW-114. PCE was quantified at concentrations less than the GQES in MW-10, MW-105R, MW-109 and MW-113. The remaining wells contained no detected levels for PCE. The estimated areal distribution of dissolved PCE is depicted on Plan Sheet 8, Dissolved PCE Summary Map for August 2, 2005. The map clearly shows a dissolved phase PCE contaminant plume emanating from the 151 South Champlain Street property and migrating downgradient to the west. A "bulge" in the 10 ppb isoconcentration contour extends to the south near 22-26 King Street. Transport of dissolved phase PCE in this direction is likely occurring due to the change in ground water flow direction to the


14

south shown in this area on Plan Sheet 6. The PCE plume becomes diffuse downgradient of the east side of Battery Street with concentrations consistently less than 25 ppb. The full extent of the PCE plume is not defined as access to the Lake Champlain Transportation Company property was denied. TCE is consistently reported at levels between 1 and 21 ppb in several wells. TCE has also been identified on-Site in several of the collected soil samples as the sole contaminant. TCE is consistently reported above the GQES through the southern downgradient portion of the area investigated. TCE is a common degreasing solvent and is also a breakdown product of PCE under proper conditions. The TCE concentrations are areally depicted along with isoconcentration contours on Plan Sheet 9. The TCE plume appears to originate from beneath the auto repair building located on the 151 South Champlain Street property. The downgradient extent and degree of contamination is consistent of the radial flow pattern of ground water seen beneath the Site. A comparison of the location, orientation and extent of the PCE and TCE plumes indicates separate sources for each contaminant. A suite of petroleum related compounds similar to those seen in the soil samples was identified in ground water in the northern portion of the investigation area. The majority of the compounds identified are associated with #2 fuel oil and/or gasoline products. The distribution of the sum total of quantified concentrations of Benzene, Toluene, Ethylbenzene, Xylenes, Naphthalene, Methyl-tert Butyl Ether, 1,2,4 TMB, and 1,3,5 TMB are depicted on Plan Sheet 9, along with estimated isoconcentration contours. Some intermittent detections of petroleum related contaminants are seen at other locations. The most highly contaminated portion of the petroleum related plume has a sum total of the suite of petroleum compounds of concern of 5,260 ppb in MW-101 and decreases to 3,424 ppb in MW-107. A number of the petroleum related compounds quantified in the ground water exceed the GQES. However, no GQES exceedences for petroleum related compounds are reported on the 151 South Champlain Street property. Due to


15

the relatively limited locations where petroleum related compounds were detected, a delineation of source area and extent of the petroleum plume cannot be made. It appears that the source of these compounds is associated with the former uses of the 53, 55 and 61 Main Street properties.

2.1.4 Ambient Indoor Air Contamination Indoor air quality sampling data are summarized on Table 6. During each sampling event an inventory of potential VOC containing materials and uses in each of the subject properties was recorded. Access could not be obtained to sample the 171 Battery Street, 181 Battery Street or 28 King Street properties. No regulation exists which specifies the concentration of VOCs allowed in the ambient indoor air of residential or commercial buildings. However the VDEC does use the EPA Region III Risk Based Concentration Table (RBC) Residential Ambient Air concentrations and the Annual Median Concentrations reported in the Vermont Department of Health (VDH), Vermont Indoor Ambient Air Quality Survey, June 1993 as guidance when evaluating the potential chemical exposure risk of building occupants. Therefore, the ambient indoor air quality results on Table 6 are compared with the RBC and VDH concentrations. PCE was identified above the RBC and/or the VDH Survey concentrations for indoor air on at least one occasion in:

• 151 South Champlain Street • 40 King Street • 156, 162, 164, 168, 174, and 197 Battery Street • 27 Main Street

The quantified PCE concentrations ranged from 0.25 ug/m3 to 4.65 ug/m3. The areal distribution of PCE in the indoor air samples is presented on Plan Sheet 7. The distribution of PCE in indoor air generally correlates to buildings above the identified dissolved and


16

adsorbed phase PCE contamination. However, some buildings such as, 27 Main Street and 40 King Street do not reside directly above the identified dissolved PCE plume and report indoor air concentrations above one or more of the guidance levels. Buildings consistently reporting quantifiable levels of PCE generally show declining PCE concentration trends. Temporal variations in the indoor air concentrations appear to be significant and are not adequately defined at this time. Interpretation of the potential impact of the ambient indoor air quality on building inhabitants is also complicated by the commercial uses of the buildings sampled. The EPA RBC table is used as a screening device to assist in determining if a specific compound is present in a particular media (soil, water or air) at a level that exposure may increase the risk of cancer or chronic illness due to prolonged residential exposure to the subject compound. The RBC Table contains Reference Doses (RfDs) and Cancer Slope Factors (CSFs). These toxicity factors have been combined with “standard” exposure scenarios to calculate RBCs--chemical concentrations corresponding to fixed levels of risk (i.e., a Hazard Quotient (HQ) of 1, or lifetime cancer risk of 1E-6, whichever occurs at a lower concentration). The equations and the exposure factors are shown in the RBC Table companion memo, the Technical Background Document. The Region III toxicologists use RBCs to screen sites not yet on the NPL, respond rapidly to citizen inquiries, and spot-check formal baseline risk assessments. The primary use of RBCs is for chemical screening during baseline risk assessment. Simply put, RBCs are like risk assessments run in reverse. For a single contaminant in a single medium, under standard default exposure assumptions, the RBC corresponds to the target risk or hazard quotient. To summarize, the Table should generally not be used to set cleanup or no-action levels at CERCLA sites or RCRA Corrective Action sites, to substitute for EPA guidance for preparing baseline risk assessments, or to determine if a waste is hazardous under RCRA.


17

The VDH Survey was performed to evaluate the background concentrations of 25 chemicals in sixty rural homes located throughout Vermont. The homes of non-smokers, in low traffic areas, along mostly non-paved roads, in towns with 4,000 or fewer inhabitants were chosen for the sampling survey. Homes within 1.5 miles of ambient pollution sources such as traffic intersections, pulp mills, etc. were eliminated from the survey. Sampling was performed in each home during the Spring, Summer, Fall and Winter season over a twelve month period. The median concentration for each chemical is assumed to represent a “typical background” concentration for a rural residence in Vermont. H&N has included the RBC and VDH concentrations in Table 6 for comparison purposes only. The RBC and VDH concentrations are not considered regulatory limits for chemical concentrations in ambient indoor air. Other VOCs identified above the RBC and or the VDH concentrations include: benzene, toluene, ethylbenzene, xylenes, methylene chloride, TCE, and carbon tetrachloride. The reported levels of the petroleum compounds and TCE are at or below background for urban environments. The presence of carbon tetrachloride and methylene chloride in the February 2006 analyses are considered specious.

3.0 Conceptual Contaminant Model All of the data collected and reviewed to date have been utilized to develop a Site specific conceptual model for PCE contaminant fate and transport detailed below. PCE was released to the ground surface and/or the subsurface near MW-11 and/or beneath the 151 South Champlain Street Blinn House building. The unknown volume of released PCE was sufficient to result in non-aqueous phase liquid (NAPL) migration to the water table surface. A soil gas plume created by volatilization of the liquid PCE radiated away from the spill source and NAPL. The soil gas plume, being heavier than air, also migrated vertically through the unsaturated soils, causing adsorbed contamination to spread as it cascaded to


18

the water table. PCE vapor and NAPL dissolved into and was transported downgradient by ground water migrating beneath the Site. Precipitation falling on the Site also transports contaminants to the ground water via dissolution of PCE adsorbed to unsaturated soil. A limited volume of DNAPL migrated vertically through the water table to the iron banded coarse sand lenses and/or the impermeability boundary created by the gray silty clay surface. It appears that DNAPL flowed through the iron banded sands and along the gray silty clay surface, as far downgradient as Battery Street. Adsorbed PCE concentrations measured in soils directly atop the gray silty clay surface beneath Battery Street are the highest observed on-Site distal to the immediate source area of the Blinn House. The "flattened” silty clay surface topography in this area appears to have limited DNAPL migration to this point. Release and migration of DNAPL likely ceased on-Site greater than 40 years ago when Park Cleaners exited the Site. As ground water flowed around and ultimately through the residual, immobile DNAPL, dissolution of PCE occurred creating disconnected ganglia of entrapped PCE. Currently, no evidence for the current presence of a mobile or residual immobile DNAPL plume is observed. The continual ground water flow through residual adsorbed phase contaminants in the iron banded sands and atop the gray silty clay has resulted in a broad PCE plume extending beyond the current monitoring network. Undulations in the clay surface along with the radial ground water flow path present at the corner of Battery and King Streets appears to have created a bifurcated PCE plume when soil results are viewed in cross section. An alternate explanation for the two lobed/bifurcated PCE plume is the release of a TCE and PCE mixture in the southern building of the 151 South Champlain Street property. The extent, degree and location of TCE contamination, implies a separate source as opposed to natural degradation of PCE to TCE at this location distal to the Blinn House. Adsorbed PCE contamination is sufficient to provide a source for dissolved phase plume generation and migration for an extended period of time. Due to the absence of property use likely releasing PCE beneath the Blinn House for upwards of 40 years, the dissolved and adsorbed phase plumes are likely in a state of equilibrium.


19

Volatilization and migration of PCE from the dissolved and adsorbed phase plumes appears sufficient to generate elevated indoor air PCE concentrations in buildings on the 151 South Champlain Street property and downgradient Battery, King and Main Street property's directly above the contaminant plume. Temporal fluctuations in ambient indoor air quality appear to be significant but have not been adequately defined at this time. It is unclear if the indoor air PCE concentrations in buildings above the diffuse portions of the ground water plume are truly resultant of soil vapor intrusion. The intermittent nature of PCE detection in these air spaces may be due to “background” sources of PCE in an urban environment. The volume of DNAPL historically released is indefinable. No evidence of liquid or residual ganglia of DNAPL was observed during the investigations. However, the PCE concentrations in the soil gas and ambient indoor air directly surrounding the Blinn House, implies that a source of PCE exists in the vadose zone beneath the building. Comparability issues with regard to the near surface residual PCE concentrations identified by ATC and H&N in 2003/2004 and the 2005 data collected by LAG exist. Near surface contaminant concentrations throughout the 151 South Champlain Street property measured in 2005 are orders of magnitude less than those previously identified. No mechanism for the rapid decrease in the adsorbed phase and soil gas PCE concentrations within 8 feet of the ground surface has been identified. However, the current extent, magnitude and location of the dissolved phase and adsorbed phase PCE plume does not support a broad, high concentration, surface related contaminant source as implied by the previously collected data.

4.0 Receptor Pathway Analysis The completion of potential receptor pathways was evaluated utilizing data collected during the LAG Phase II. The primary pathways for exposure to the VOC contamination identified include breathing ambient indoor air; migration along and discharge of contaminants to utility corridors and exposure to contaminated soil and soil gas by utility/construction workers. Each of these


20

exposure pathways has been evaluated and data collected from the majority of the potentially impacted locations. A summary of the receptor pathway completion analysis is included in the following subsections.

4.1 Ambient Indoor Air Data collected to date from 1 residential building (Blinn House) and 13 commercial buildings surrounding the Site indicate that quantifiable levels of PCE exist above the EPA RBC level for residential use in the air space of nine buildings located directly atop or adjacent to the identified adsorbed and dissolved phase PCE plume. The buildings with PCE levels measured above the RBC at least once are:

151 S. Champlain Street 27 Main Street 40 King Street

156 Battery Street 162 Battery Street 164 Battery Street


The PCE concentrations measured in each of the identified buildings show significant temporal fluctuations. This is likely due to a number of conditions including atmospheric pressure, building ventilation and many being used as commercial properties. The ratio of PCE contribution from “typical commercial use in an urban environment” versus the contribution from soil gas contaminated by the 151 South Champlain Street related contamination is unknown. Likely property use related sources for the “background “concentrations of PCE include, release from cleaning/degreasing products, off gassing from dry cleaned garments and fabrics associated with furniture and carpeting. All of the factors associated with the intermittent presence and fluctuation of PCE contaminant concentrations have resulted in the conservative conclusion that PCE vapor intrusion to the building basements at 151 South Champlain Street, 156, 162, and 164 Battery Street properties could be occurring. These buildings are directly atop the highest ground water related concentrations of PCE and show consistent PCE presence


21

in indoor air samples. Indoor air PCE presence in properties atop or adjacent to the diffuse portions of the ground water plume (27 Main Street; 168, 174, 187 Battery Street; and 40 King Street) may or may not be the result of soil vapor intrusion. Further sampling is necessary to establish if there is a relationship between the documented release and these properties. 4.2 Utility Corridors Several utility corridors are associated with the 151 South Champlain Street property and downgradient areas impacted by adsorbed and dissolved phase PCE. A number of soil gas, soil and ambient air samples have been collected from adjacent to and within the utility corridors. The data clearly indicates that potential exposure of utilities and associated workers to contaminant migration is minimal. Exposure to soil or soil gas concentrations greater than the OSHA limits is negligible.

5.0 Corrective Action Goal The primary goal of this Revised Corrective Action Plan is to:

• Minimize the potential for humans to be exposed to 151 South Champlain Street related contaminants entering indoor air spaces.

Mitigation of risks associated with the potential redevelopment of the 151 South Champlain Street property will be addressed in a separate Revised Corrective Action Plan designed specifically for the specific redevelopment chosen. Utilizing the conceptual model detailed in Section 4 and a number of assumptions regarding contaminant fate and transport, the following remedial actions are proposed to achieve the corrective action goal. The remedial actions are proposed in “phases” with significant efficacy monitoring occurring concurrently to ensure that a “linkage” between the 151 South Champlain Street PCE contaminated soil gas and ambient indoor air concentrations exists. The methods to be utilized to achieve this goal are:


22

5.1 Phase I – Vapor Mitigation/Monitoring System Installations, Notice to Land Records and Additional Subsurface Investigation Phase I of the Revised Corrective Action Plan is to be performed immediately following plan approval. The completion of Phase I activities during the 2008/2009 heating season is critical for the scheduled performance of all other Revised Corrective Action Plan Phases.

1. Installation of a sub slab soil vapor intrusion mitigation system

beneath the Blinn House prior to it being re-occupied. 2. Installation of sub slab soil vapor intrusion mitigation systems at

the 156, 162, and 164 Battery Street properties. 3. Installation of sub slab soil gas monitoring points at the 168 and

174 Battery Street; and 40 King Street properties. 4. Emplacement of Notices to Land Records at all properties atop

the identified PCE plume of impacted groundwater. 5. Signing of Access Agreements with all of the affected property

owners, to allow for further soil vapor, groundwater, and indoor air quality sampling.

6. Performance of additional subsurface investigations at targeted locations on/adjacent to properties on the periphery of the identified PCE plume to determine if the properties are actually affected by contamination from 151 South Champlain Street and would therefore require notices to the land records. These properties include 157 South Champlain Street, 180 Battery Street, 23 King Street, 40 King Street and 27 Main Street

5.2 Phase II – Short-Term Vapor Mitigation System Efficacy, Soil Gas Intrusion, and Ground Water Quality Monitoring and Reporting Phase II of the Revised Corrective Action Plan will be performed over the 18 months following completion of Phase I. The operation and monitoring schedule proposed is designed to collect data through two heating seasons and one summer season. These data will provide crucial information regarding the efficacy of the installed sub slab vapor intrusion


23

mitigation systems. Equally important is the collection of data necessary to determine if 151 South Champlain Street PCE contaminated soil gas intrusion is occurring into buildings with or without vapor mitigation systems. Proof of “linkage” of the 151 South Champlain Street PCE to the ambient indoor air concentrations measure throughout the study area depends on the collection of these data.

1. Operation and detailed monitoring of the efficacy of the Blinn House sub slab vapor intrusion mitigation system if and when the building is re-occupied.

2. Operation and detailed monitoring of the efficacy of the 156, 162, and 164 Battery Street property sub slab vapor intrusion mitigation systems.

3. Detailed monitoring of the sub slab soil gas monitoring points at the 168, and 174 Battery Street; and 40 King Street properties.

4. Collection of ambient indoor air samples from all properties previously sampled, 171 Battery Street, 181 Battery Street, and 22-26 King Street.

5. Collection of annual groundwater quality samples. 6. Preparation of a comprehensive report detailing the results of

the additional subsurface investigation and indicating if Notices to Land Records are required for any of the specific properties investigated.

7. Preparation of a detailed Phase II – Corrective Action Report presenting and discussing sub slab vapor mitigation system operation data, evaluation of contaminated soil gas intrusion monitoring data from buildings with and without vapor mitigation systems, and ground water quality results. The report will also make recommendations regarding the need for additional vapor mitigation system installations, ambient indoor air monitoring, soil gas intrusion monitoring, and ground water quality sampling.

8. Preparation of a Long-Term Site Operations and Management Plan. This plan will detail the methods and schedule for implementation of the recommendations put forth in the Phase II Corrective Action Report. The Long-Term Site Operations and Management Plan will be completed within 2 months of VDEC approval of the Phase II – Corrective Action Report.


24

5.3 Phase III - Long Term Operations and Management Phase III will consist of implementation of the recommendations of the Long-Term Operations and Management Plan. Due to the uncertainty of the outcome of the initial corrective actions and their efficacy, the contents of the Long-Term Operation and Management Plan are unknown. It is assumed that at least one of the proposed sub slab vapor mitigation systems will remain operational, additional sub slab vapor mitigation systems may need to be installed, continued monitoring of the ground water plume will be necessary and reporting of collected data will occur. The data collected will be evaluated to assure sub slab vacuum conditions are controlled through all seasons, to determine if system optimization/modification is necessary and to assure sub slab/vapor intrusion conditions remain stable in all of the buildings being monitored.

6.0 Proposed Corrective Actions Prior to initiating any of the proposed corrective actions on individual properties H&N will enter into formal Access Agreements with each property owner. The access agreements are specific to the work to be performed at each property. Each of four different generic Access Agreements are included in Appendix 4. Property specific agreements have been requested and approved for several properties. These agreements are also included in Appendix 4.

6.1 Phase I -Vapor Mitigation/Monitoring System Installations,

Notice to Land Records and Additional Subsurface Investigation

6.1.1 Vapor Mitigation System Installation

The table below lists each of the buildings atop the most concentrated portion of the ground water plume and where 151 South Champlain Street related contaminants are consistently measured in ambient indoor air above the EPA RBC and VDH Survey concentrations. These buildings will have soil gas intrusion mitigation systems installed. The vapor mitigation systems are


25

designed to preclude intrusion of contaminated soil gas. If the soil gas recovered is not contaminated, the ambient indoor air quality will be unchanged.

151 S. Champlain Street (if re-occupied) 164 Battery Street

162 Battery Street 156 Battery Street

It has been assumed that the presence of PCE and TCE related contaminants in the ambient indoor air is associated with the 151 South Champlain Street ground water plume migrating beneath these buildings. It is also assumed that the VOC concentrations identified fluctuate seasonally to a degree that requires active abatement. If the VOC concentrations observed are not related to the ground water plume, utilization of the proposed remedial systems will not reduce the concentration of VOCs measured in these buildings. In the event it is proven that contaminated soil vapor intrusion is not occurring the vapor intrusion mitigation systems may eventually be decommissioned. Soil gas intrusion mitigation will occur via depressurization of the soils beneath the impacted buildings. Individually controlled depressurization systems will be installed and operated at each individual building. This will allow for independent control and tuning of each system. A new, dedicated, mitigation system electric service will be installed in each building. This will enable independent billing of electric usage to the responsible party. It has been assumed that minimal reduction in contaminant concentrations will be seen downgradient of the source area on 151 South Champlain Street. This provides what is anticipated to be a conservatively over designed mitigation systems for each of the properties. Basement/ground floor usage and physical constraints will require discussions with individual property owners to determine final system layouts. The final as-built construction of


26

each system will be documented and submitted to the property owner and the VDEC. The conceptual sub slab depressurization systems designed for each building are similar and based on the requirements of the American Society for Testing and Materials (ASTM) E-2121-03 Standard Practice for Installing Radon Mitigation Systems in Existing Low-Rise Residential Buildings. This standard is recommended by the EPA for radon gas intrusion mitigation and included as Appendix 1. A generic schematic of the active sub slab soil depressurization system design is included as Figure 3. Each of the abatement systems are identical in function but will vary slightly depending upon the presence of a basement, lowest floor use, building construction materials and the degree of anticipated soil gas contamination. The systems will extract soil gas via four to eight 3” PVC soil gas extraction points installed through the basement/slab floor. The locations of the extraction points must take into consideration the presence and location of any utilities entering the building through the basement walls and floor. Utility trenches likely are often backfilled with coarse grained material which is much more transmissive than the surrounding native soils. This may result in “short circuiting” of soil gas from around the utility line into the sub slab depressurization wells. This would limit the extent and degree of vacuum the system could create beneath the slab. Extraction points will be placed in a manner to ensure limited potential for short circuiting while still providing an appropriate vacuum beneath the entire building. The utility line entrances to each building will be located. The proposed extraction points will be located at least 20 feet away (if possible). In addition, the floor penetration surrounding the utility lines will be sealed with a flexible caulk and/or membrane to prevent direct “short circuiting” of soil gas. Soil gas transmission piping from the extraction points to a common manifold will be either 3” or 4” PVC depending upon the length of


27

piping and number of fittings required. A 6” PVC manifold will connect to an inline fan which will withdraw soil gas from the permeable soil/fill directly below the floor and discharge it to the atmosphere. The fan utilized must be capable of creating a differential vacuum between the soil beneath the slab and the interior air space of 0.025 to 0.035 inches of water to adequately capture the soil gas. The fan will be located in a protective, locked enclosure mounted to the wall (preferably inside the building). The fan will be located to minimize the length of pressurized discharge piping within the building. A differential pressure gage will be permanently placed adjacent to the fan to measure the vacuum being created by the system. An automatic vacuum monitor will be placed adjacent to the fan which sounds an audible alarm if the blower fails to create at least 0.025” of vacuum. A label will be present adjacent to the alarm with instructions to call H&Ns office. H&N will instruct the caller how to temporarily disable the alarm. H&N will respond to the subject building to investigate the cause of vacuum reduction. A muffler will be placed after the fan to reduce noise. Piping will exit the building and terminate at least 2 feet above the roof line and preferably 1 foot above the roof peak. A condensate diverter will be placed at the base of the pipe outside the building to release any condensed water vapor away from the fan and collection piping. Detailed specifications of each of the proposed sub slab depressurization system components are included in Appendix 2. The fans utilized in each building will be selected based on the number of extraction points emplaced, the ability of the sub slab fill/soil to transmit soil gas, and the length of piping needed to manifold the extraction points to the fan. Once a system is installed, vacuum and air flow data will be collected to determine if the selected fan provides the necessary vacuum and flow. If necessary, a different fan with better matched operating parameters can be simply installed without modification of the piping or electrical connections. If the larger fan does not create


28

the necessary vacuum coverage, additional sub slab extraction points could be installed and plumbed to the existing system. The extracted soil gas flow rate needed to create the desired sub slab vacuum will depend on building construction and “tightness” of the existing floor and wall materials. Previous experience indicates that between 50 and 250 cubic feet of air will be removed per minute by each depressurization system. All cracks and penetrations of the concrete floors with air gaps greater than ¼” will be sealed. Sealing will be performed with either hydraulic cement, urethane based caulking, expansion foam or a combination of the three. No floor drains were observed during previous inspections. However, if floor drains are found, they will be retro fitted with a ball check type seal which will allow water to flow into the drains but restrict soil gas entry into the building. A typical floor drain seal schematic is included in Appendix 2. Several vapor monitoring points will be installed when the sub slab depressurization system extraction wells are installed. The vapor monitoring points will be placed at varying distances from the active extraction wells. The vapor monitoring points will be constructed of 1” diameter PVC pipe, sealed into the floor and capped with a vacuum/pressure proof cap. The monitoring points will allow for collection of induced vacuum data necessary to determine if the entire sub slab area is under at least .025 inches of water vacuum. This minimum level of differential pressure between the basement airspace and the sub slab is required to assure soil gas intrusion is not occurring. Basement/ground floor usage and physical constraints will require discussions with individual property owners to determine vapor monitoring point layouts. The final as-built construction diagram showing the location of each vapor monitoring point will be documented and submitted to the property owner and the VDEC. Each of buildings requiring abatement has a unique use, construction and size. The current building construction, use, layout and size have been considered to develop a proposed soil


29

gas intrusion abatement system. As detailed above, coordination with property owners, basement/ground floor occupants will likely dictate the placement of the extraction and monitoring points and fan assembly. The final extraction fan placement and permeability of the sub slab materials will dictate the specific piping and fan sizing. Best estimates of the final abatement system designs for each impacted building are discussed in the following subsections.

6.1.1.1 151 South Champlain Street - Blinn House (to be installed only if building is to be re-occupied)

Basement Use: Unoccupied apartment with walkout

Basement Floor: Uneven concrete slab Basement Wall: Fieldstone and brick with mortar Proposed Number of Interior Extraction Points: 4 Proposed Number of Exterior Extraction Points: 1 Proposed Number of Monitoring Points: 4 Proposed Extraction Fan: DR404 Rotron Estimated Air Volume Removal Rate: 100 cfm Proposed Blower Location: Small enclosure on exterior of building containing blower and 200 lb granular activated carbon treatment unit. The Blinn House is currently unoccupied. Hinsdale does not plan to have the building re-occupied. The proposed vapor mitigation system will not be installed at this time. The proposed system MUST be installed and be operational prior to any re-occupation of the building. The Blinn House


30

represents the source of chlorinated solvent related contaminants seen in the ground water plume migrating downgradient towards Lake Champlain. The investigations have consistently indicated a PCE vapor impact to the Blinn House at levels which imply a significant source mass behind the building and beneath the floor and have necessitated the vacancy of the basement apartment. In addition to the interior extraction points, a vapor extraction point is proposed for outside the rear of the building in the old privy area. This area likely contains the highest PCE concentrations in the soil gas beneath the site. Direct extraction of soil gas in this area will limit the migration of PCE vapor towards the extraction points beneath the building slab. This will minimize the contaminant concentrations in the soil gas extracted from directly beneath the building. Contaminated soils encountered will be drummed and shipped by a certified hazardous waste disposal company as F-listed waste. It is anticipated that the concentration of PCE in the soil gas removed by the Blinn House depressurization system will require treatment prior to discharge to the atmosphere to meet VDEC Air Pollution Control Division requirements. The treatment device will create 2 to 10 inches of water back pressure. Therefore, the proposed system will consist of a 1 horsepower Rotron regenerative blower connected to a 200 pound granular activated carbon treatment unit. The system will be located in a small shed at the rear of the building to allow for unfettered access for monitoring and carbon unit change outs. The blower and carbon treatment specifications are included in Appendix 3.

6.1.1.2 156 Battery Street Basement Use: Office, Laboratory


31

Basement Floor: Concrete with carpet Basement Wall: Fieldstone and brick with mortar Proposed Number of Extraction Points: 3 Proposed Number of Monitoring Points: 3 Proposed Extraction Fan: RadonAway RP260; FanTech HP220 Estimated Air Volume Removal Rate: 100 cfm Proposed Blower Location: Center of east wall potentially

outside The office/laboratory use and finished construction will require extraction point installation adjacent to existing walls and may require being boxed into new pipe chases. The piping may be able to be run above the ceiling without significant finished ceiling disturbance. 6.1.1.3 162 Battery Street Crawlspace Use: Limited storage Crawlspace Floor: Polyethylene covered earth Crawlspace Wall: Fieldstone and brick with mortar Proposed Number of Horizontal Extraction Lines: 2 Proposed Number of Monitoring Points: 2 Proposed Extraction Fan: RadonAway RP260; FanTech HP220


32

Estimated Air Volume Removal Rate: 150 cfm Proposed Blower Location: East wall likely outside The crawlspace beneath the building is between 2 and 3 feet tall with an undulating earthen surface. Polyethylene sheeting has been placed atop the soil surface. A sub membrane depressurization system is proposed for this area. The current polyethylene sheeting will be removed, the crawl space surface smoothed and an array of horizontal 4” PVC extraction piping embedded just below the soil surface. An 8 mil heavy duty polyethylene membrane will then be placed atop the soil and sealed to the foundation walls. Figure 2 is a schematic representation of the piping, membrane and sealing system. Any joints or penetrations through the membrane will be overlapped and sealed. The remainder of the depressurization system installation will be identical to the previous designs. 6.1.1.4 164 Battery Street Basement Use: Office Basement Floor: Concrete with carpet Basement Wall: Fieldstone and brick with mortar Proposed Number of Extraction Points: 3 Proposed Number of Monitoring Points: 3 Proposed Extraction Fan: RadonAway RP260; FanTech HP220 Estimated Air Volume Removal Rate: 100 cfm


33

Proposed Blower Location: Center of east wall likely outside The office/storage use and finished construction will require extraction point installation adjacent to existing walls and may require being boxed into new pipe chases. The piping may be able to be run above the ceiling without significant finished ceiling disturbance.

6.1.2 Contaminated Soil Vapor Intrusion Confirmation Monitoring

Due to the urban setting, commercial building uses, intermittent detection of PCE in indoor air and diffuse concentration of PCE in the ground water beneath the many down gradient properties, there remains the potential that the 151 South Champlain Street plume is not causing PCE soil gas intrusion. The following properties are adjacent to buildings which will be receiving soil gas intrusion mitigation systems. Each of these buildings will have 1” diameter sub slab vapor monitoring points installed to allow for data collection necessary to determine if PCE contaminated soil gas intrusion is actually occurring. Basement/ground floor usage and physical constraints will require discussions with individual property owners to determine final monitoring point layouts. The final as-built construction diagram showing the location of each soil vapor intrusion monitoring point will be documented and submitted to the property owner and the VDEC. All cracks and penetrations of the concrete floors with air gaps greater than ¼” will be sealed. Sealing will be performed with either hydraulic cement, urethane based caulking, expansion foam or a combination of the three. No floor drains were observed during previous inspections. However, if floor drains are found, they will be retro fitted with a ball check type seal which will allow water to flow


34

into the drains but restrict soil gas entry into the building. A typical floor drain seal schematic is included in Appendix 2. Each of buildings has a unique use, construction and size. The current building construction, use, layout and size have been considered to develop a proposed contaminated soil gas intrusion monitoring point array. As detailed above coordination with property owners, basement/ground floor occupants will likely dictate the placement of the monitoring point. Best estimates of the final monitoring point array for each impacted building are discussed in the following subsections.

6.1.2.2 40 King Street Ground Floor Use: Warehouse storage Ground Floor: Uneven concrete slab with several differing levels Proposed Number of Monitoring Points: 4 The warehouse is a single story building with several levels of concrete slab floor. The constant movement of stored product in and out of the building will require monitoring point placement along partition walls away from the body of the open spaces. 6.1.2.3 168 Battery Street Basement Use: Retail Space, Office, Eye examination rooms Basement Floor: Concrete with carpet Basement Wall: Fieldstone and brick with mortar Proposed Number of Monitoring Points: 3


35

The office/storage use and finished construction will require monitoring point installation adjacent to existing walls. 6.1.2.4 174 Battery Street Basement Use: Storage, Computer server Basement Floor: Concrete Basement Wall: Poured concrete Proposed Number of Monitoring Points: 4 The basement of the building has a single level concrete slab floor in excellent condition. All utilities enter in the same general area. Due to frequent access monitoring points will need to be placed near existing storage structure and walls.

6.1.3 Notices to Land Records It is assumed that residual PCE and its breakdown products will be present on the soils and in the ground water beneath the entire Site at concentrations requiring monitoring and reporting to the VDEC. Typically, notices to the land records would be placed on all properties located atop the plume. The notices are intended to ensure any future property use changes are reviewed and approved by the VDEC prior to these actions being taken. The Notice to Land Record will remain in place and will be presented to potential new property owners until such time that PCE related contaminant concentrations no longer require tracking by the VDEC. Due to the unique conditions on each property impacted by the contaminant plume several different agreements will be utilized. The proposed Notices are included in Appendix 4.

6.1.3.1 151 South Champlain Street


36

The Notice for the 151 South Champlain Street property indicates that no excavation, drilling, exterior building modifications, soil gas mitigation system modification or surface water collection and dispersal modifications can be performed without prior notification, detailed plan and design presentation and approval by the VDEC. Any interior construction or use change will also require a notification to the VDEC to assure the operating parameters and effectiveness of the vapor mitigation system is not affected. No excavation or ground water removal can occur without prior VDEC notification and approval. There is also an indication that collection of indoor air and/or groundwater samples may be necessary into the future. This will ensure that any modifications of the buildings will not significantly impact the effectiveness of the proposed vapor mitigation system and assures all buildings owners and occupants' knowledge of the presence and implications of the 151 South Champlain Street plume on property use. 6.1.3.2 Ground Water and Soil Impacted >10 Feet

Below Grade This Notice will be entered into at the following properties:

22-26 King Street 31-35 Main Street 51-53 Main Street 152 Battery Street

156 Battery Street 162 Battery Street 166 Battery Street 168 Battery Street


The Notice for these properties require that no excavation deeper than 10 feet will be performed without VDEC notification, review and approval. An example of this notice is included in Appendix 4.


37

6.1.3.3 Ground Water and Soil Impacted > 5 Feet Below Grade

This notice will be entered at the 189 Battery Street property. The presence of contaminants between 5 and 10 feet below grade in the area leads to the reduce excavation depth requirement to notify the VDEC. The Notice to Land Record is included in Appendix 4. 6.1.3.4 Ground Water and Soil Impacted <5 Feet

Below Grade This Notice to Land Record will be entered into at the 0 King Street (Lake Champlain Transportation Company properties), 1 Main Street (1 Steele Street), and the Railroad right-of-way/Bike Path properties. The Notice for these properties atop the ground water plume indicates that no excavation will be performed without VDEC review and approval.

6.1.4 Additional Subsurface Investigation The additional subsurface investigation will be performed to define if quantifiable levels of PCE related to the 151 South Champlain Street site are present at the property line of several properties on the outer limits of the plume. The investigation locations are shown on Plan Sheet 10. Seven locations have been chosen for the investigation. Direct push drilling methods will be used at each boring location. As with previous investigations a field gas chromatograph (FGC) will be utilized to collect PCE analyses data in “real time” as the borings are advanced. The FGC data will be augmented with laboratory analysis of confirmatory samples. The following describes the media to be sampled at each location.

6.1.4.1 Soil Gas Sampling


38

Soil gas samples will be obtained from each boring at 5 and 10 feet below ground surface. The samples will be collected using a Solinst discrete sampling probe. Disposable tubing will be utilized at each boring location. Once the goal depth is reached a bentonite seal will be placed between the drill rod and the boring annulus. The seal will be packed into the annulus to a depth of one foot to prevent short circuiting of atmospheric air during sampling. An SKC personal sampling pump will be connected to the disposable tubing attached to the sampling point and soil gas extracted. Each soil gas sample will be placed into a tedlar bag for screening via PID and FGC. In addition an EPA TO1/TO2 soil gas sample will be collected from each boring location. The TO1/TO2 sample will be collected from the depth at which the highest FGC reading is measured. If no FGC quantifiable concentrations are measured the TO1/TO2 sample will be collected from the 10 foot depth. The TO1/TO2 sample will be analyzed at Endyne Laboratory for the presence of VOCs. Upon completion of sample collection the boring will be abandoned by pressure grouting with a bentonite slurry. The ground surface will be returned to its original condition. 6.1.4.2 Soil Sampling Soil borings will be advanced at each location using a continuous, direct push sampling method. The soil borings will be advanced to a total depth of 10 feet below groundwater saturation. Soil samples will be obtained in 4 foot acrylic sleeves. Each soil sample sleeve will be opened and screened with a PID. The soils will be descriptively logged and a representative sample obtained for analysis via FGC. The FGC sample will be obtained from either the section of the sample containing the highest PID reading or, if no PID reading is shown, from the center of the sample. Sufficient sample material will be obtained to allow for


39

laboratory confirmation analyses. At a minimum, one soil sample from each boring will be analyzed via EPA Method 8260 at Endyne. The laboratory sample will selected using the FGC data as a guide. The most contaminated sample from each boring will be submitted for laboratory analysis. If no contamination is identified in an individual boring via FGC the soil sample obtained from the groundwater interface will be submitted for laboratory analysis. 6.1.4.3 Groundwater Monitoring Well Installation

and Sampling Upon completion of each soil boring a monitoring well will be placed within the existing borehole. A 3” diameter flush coupled casing with disposable tip will be advanced down the existing soil boring. The casing will be advanced to a depth equivalent to 5 feet below the groundwater surface. A 1” schedule 40 PVC well consisting of 10 feet of factory slotted well screen and sufficient solid riser is the n placed within the casing. The annulus between the casing wall and well will be filled with pack sand as the casing is removed. The sand pack will be placed to 1 foot above the well screen. A bentonite clay plug will be placed atop the sand pack to a depth of 2 feet below grade. The well will be finished at grade with a traffic rated manhole embedded in a concrete collar. Upon completion the new monitoring wells will be developed using non-turbulent techniques until the water removed runs clear. After a one week equilibration period, each of the groundwater monitoring wells will be sampled. The sampling procedure is begun by measuring the depth to groundwater within the well. H&N’s “Low Flow” sampling methodology will be utilized to purge groundwater form the wells until equilibrium is seen in pH, Dissolved Oxygen, Oxidation/reduction potential, specific conductivity and temperature is observed. A disposable bailer will then be


40

used to obtain samples for EPA Method 8260 analysis at Endyne. 6.1.4.4 Waste Disposal Waste materials will be generated during the investigation will include: tubing, bailers, gloves, purge waters, decontamination waters, soil, and soil sampling sleeves. If all of the analysis data indicates a lack of contamination in the soil borings the wastes will be disposed of as regular solid waste. If any contamination is identified in the materials sampled the wastes will be classified as F-Listed hazardous wastes and disposed of via incineration by a certified hazardous waste hauler. All of the wastes generated during the investigation will be stored in appropriately labeled drums on the 151 South Champlain Street property awaiting laboratory results and disposal method determination. The drums will be located in the currently unoccupied basement apartment of the 151 South Champlain Street “Blinn House”. 6.1.4.5 Site Survey Each of the new soil boring and monitoring well locations will be surveyed with a laser transit to accurately locate them in relation to existing on-site features and to determine their relative elevations. The survey data will be used to update the site map and data tables currently existing for the site.

6.2 Phase II – Short-Term Vapor Mitigation System Efficacy, Soil Gas Intrusion, and Ground Water Quality Monitoring and Reporting

Phase II of the corrective action will be performed during the 18 months following completion of Phase I. The operation and monitoring schedule has been designed to collect data during the 2008/2009 and 2009/2010 heating seasons and during the summer of 2009. The data collected will


41

be used to generate a comprehensive Phase II Corrective Action Report which will:

• determine the effectiveness of the vapor mitigation systems to depressurize the soils under each building slab to at least 0.025 inches of water vacuum,

• determine if 151 South Champlain Street PCE contaminated soil vapor intrusion is occurring,

• define ambient indoor air quality trends through several heating seasons,

• provide additional data for evaluating Site-wide ground water quality trends, and

• provide a Long-Term Operations and Management Plan for implementation of the Phase II corrective Action Report recommendations.

Each of the following subsections describes the actions to be taken to properly operate, monitor and evaluate the Phase I mitigation and monitoring systems and collect sufficient data to generate the Phase II – Corrective Action Report.

6.2.1 Soil Gas Intrusion Mitigation System Monitoring

6.2.1.1 151 South Champlain Street – Blinn House

Upon initial installation (prior to re-occupation) the soil gas intrusion mitigation system will be monitored on a weekly basis for one month. Data collected weekly will include induced vacuum, air flow rate, temperature, VOC concentration in extracted air and post treatment system via PID, and differential pressure between outside/inside basement/sub slab piping. Indoor ambient air and extracted soil gas samples will be collected after two weeks of system operation and analyzed


42

via EPA Method TO1/TO2 for VOCs. If the installed system does not reduce indoor air concentrations of VOCs or create adequate sub slab depressurization, the blower will be changed to achieve greater vacuum impact. Additional extraction wells may also be utilized if the blower change does not provide adequate results.

After the first month of “successful operation” (defined for this property as: maintenance of vacuum influence beneath the entire slab and reduced indoor air PCE concentrations in the indoor air) the soil gas mitigation system will be monitored monthly and indoor air samples collected quarterly for one year and semiannually until 18 Months after installation. Monitoring results will be reported to the VDEC in tabular form within one week of collection. 6.2.1.2 Soil Gas Impacted Properties

The operation of the proposed sub slab/sub membrane depressurization systems may not result in the reduction of contaminant concentrations in the indoor air. As a result, the efficacy of the soil gas intrusion mitigation systems cannot be linked solely to reduction of PCE concentrations in ambient indoor air. The creation of a consistent minimum relative pressure differential of 0.025 inches of water between the indoor air space in the basement/ground floor and the sub slab/membrane soils will be the definitive measure of proper system function. The proposed monitoring and sampling protocols below ensure collection of all data necessary to properly evaluate individual vapor intrusion mitigation system effectiveness.

Upon initial installation, each vapor intrusion mitigation system off the 151 South Champlain Street property will be monitored on a weekly basis for one month. Data collected weekly will include induced vacuum, air flow rate,


43

temperature, and differential pressure between outside/inside basement/sub slab piping. Indoor ambient air and extracted soil gas samples will be collected after one month of system operation and analyzed via EPA Method TO1/TO2 for VOCs. The concentration of VOCs extracted will be below the detection limit for a PID. Therefore, no PID monitoring will occur. If the installed system does not create adequate sub slab depressurization, the fan will be changed or an additional fan will be installed to achieve greater vacuum impact. Additional extractions wells may be necessary if the additional fan does not achieve the vacuum influence necessary.

After the first month of “successful operation” (defined for these properties as: maintenance of vacuum influence beneath the entire slab) the soil gas mitigation systems will be monitored monthly and sampled semiannually for the remainder of the 18 month Short-Term monitoring and evaluation period.

6.2.2 Sub Slab Soil Gas Monitoring Properties

The presence and potential for intrusion of 151 South Champlain Street related contaminants immediately beneath the building slabs will be monitored. Each sub slab soil gas monitoring building will be monitored on a semiannual basis. Data collected will include temperature and differential pressure between outside/inside basement/sub slab soils. Semi annual indoor ambient air and soil gas samples will be collected and analyzed via EPA Method TO1/TO2 for VOCs during the 18 month Short-Term monitoring and evaluation period.

6.2.3 Indoor Air Sampling

Ambient indoor air samples will be collected from all buildings previously sampled on a semi-annual basis throughout the 18


44

month Short-Term monitoring and evaluation period (i.e. 2008/2009 heating season, 2009 summer, 2009/2010 heating season). Permission to sample 171 Battery Street, 181 Battery Street and 22-26 King Street has been obtained from each property owner. Each of these buildings will be included in the ambient air sampling rounds. Samples will be obtained from the basement/lowest level and first floor locations utilized during the Site investigation efforts. Each location will be inspected and the use and contents of the area documented. Each sample will be analyzed via EPA Method T01/T02 or acceptable alternate methodology for the presence of 151 South Champlain Street related contaminants. At least one outdoor and one duplicate sample will be obtained during each sampling round. The Site-wide ambient indoor air sampling will be performed in conjunction with the proposed sub slab and soil gas sampling detailed above.

6.2.4 Ground Water Sampling

The current monitoring well array defines the majority of the 151 South Champlain Street related contaminant plume. The source of the 151 South Champlain Street related plume ceased several decades ago. The plume is fully developed and likely in stasis or very slowly reducing in size and degree of contamination. Therefore, the proposed annual ground water monitoring frequency is sufficient to track the subtle variations in contaminant concentrations expected.

Each ground water monitoring and sampling event will consist of accessing each of the existing wells for water level measurement by an interface probe with 0.01 foot increments. Well headspace gas monitoring with a PID will also be performed in all wells. Low flow sampling techniques will be utilized to acquire representative ground water samples for analysis by EPA Method 8260. H&Ns low flow sampling protocol meets industry standards and will be followed. Decontamination wastes and purged ground water will be


45

drummed on the 151 South Champlain Street property for disposal following each sampling event. 6.2.5 Reporting

6.2.5.1 Additional Subsurface Investigation Report Upon receipt of the laboratory results a comprehensive investigation report will be generated detailing all of the information gathered. The report will include the required aspects dictated by the VDEC Site Investigation Procedure, June 2005. H&N will update the existing site maps, cross sections and groundwater flow direction mapping. Conclusions and recommendations regarding the presence or absence of 151 South Champlain Street related contaminants on the downgradient properties which are the subject of the investigation will be made. The ultimate goal of the investigation report is to provide justification for or against placement of Notices to the Land Records for the 27 Main Street, 157 South Champlain Street, 40 King Street and 180 Battery Street properties. 6.2.5.2 As-Built Report Upon completion of individual sub slab/membrane depressurization and sub slab soil gas monitoring point system installations and one month of successful operation a comprehensive as built report will be generated. The report will include scaled maps showing each extraction and monitoring point, piping manifold and fan assembly location. The data collected during startup procedures will be presented along with a discussion of the operating parameters of each system.

6.2.5.3 Phase II – Corrective Action Report


46

Upon completion of the 18 month Short-Term monitoring and evaluation period H&N will generate a detailed Phase II – Corrective Action Report. The Phase II – Corrective action Report will present all data collected during the evaluation period. The report will include conclusions regarding:

• the efficacy of the vapor intrusion mitigation systems installed at the 151 South Champlain Street, 156, 162 and 164 Battery Street properties to create consistent sub slab depressurization,

• the presence or absence of PCE contaminated soil vapor beneath 151 South Champlain Street, 156, 162 and 164 Battery Street properties,

• the presence or absence of PCE contaminated soil vapor beneath the 27 Main Street; 158 and 174 Battery Street; and 40 King Street buildings and the ability of soil vapors to enter these buildings,

• whether “linkage” between the 151 South Champlain Street ground water plume and the soil gas beneath the monitored buildings exists,

• ambient indoor air quality trends in all buildings sampled, and

• ground water quality trends. Based on the conclusions, detailed recommendations will be put forth as deemed necessary regarding:

• the need for continued vapor mitigation system operations,

• the need for installation of additional vapor mitigation systems at other properties,

• potential modification of soil vapor mitigation system operation and monitoring frequencies,

• ambient indoor air quality sampling locations and frequency,

• ground water quality sampling locations and frequency, and


47

• any other issues germane to ensuring minimal human contact with the 151 South Champlain Street related contaminants.

6.3 Long Term Operations and Management Plan Phase III will consist of the generation of a comprehensive plan to implement VDEC approved recommendations put forth in the Phase II – Corrective Action Report. Due to the uncertainty of the outcome of the initial corrective actions and their efficacy, the contents of the Long-Term Operation and Management Plan are unknown. The report will be generated within 2 months of VDEC acceptance of the Phase II Corrective Action Report. It is assumed that at least one of the proposed sub slab vapor mitigation systems will remain operational, minimal ambient indoor air sampling, and continued monitoring of the ground water plume will be necessary along with reporting of collected data. The Long Term Operations and Management Plan will include periodic “Milestones” at which time a complete evaluation of the current plan will be performed and recommendations made regarding:

• the need for modification and/or continued operation of vapor mitigation systems,

• the need for installation of additional vapor mitigation systems, • modification of site wide monitoring/sampling locations and

frequencies • modification of notices to land records

In this manner, appropriate risk reduction and contaminant fate tracking can be assured. A 5 year operation and maintenance scheme has been assumed for the generation of the cost estimate discussed below.

7.0 Revised Corrective Action Plan Implementation All proposed work on-Site including soil vapor mitigation and monitoring system installations, monitoring, maintenance, and sampling will follow


48

VDEC guidelines. A generalized schedule for RCAP implementation is included as Figure 4. RCAP implementation will include the following: Phase I

• Coordination and design of soil gas mitigation systems with individual property owners;

• Obtaining necessary permits;

• Procurement and installation of all necessary equipment;

• Subcontracted electrical utility installation.

Phase II

• Initial startup period;

• Preparation of As-Built Reports;

• Optimization, routine operation, monitoring, sampling and

maintenance of mitigation systems, ambient air sampling and ground water sampling for the 18 month Short-Term Operation and Monitoring period;

• Preparation of the Phase II- Corrective Action Report.

Phase III

• Generation and implementation of a Long Term Operations and Management Plan

Specific aspects of the RCAP implementation are described in the following Sections.

7.1 Permits


49

Each soil gas mitigation system will require the installation of an electric meter and breaker panel. All electrical wiring required will be performed by licensed professional electricians under all appropriate state and local permits. Depending upon the location of the fan housing (interior or exterior) a City of Burlington building permit may be necessary. No other permits are anticipated. 7.2 Subcontractors Any subcontractors necessary will be selected through a competitive bidding process. The bids regarding electrical and carpentry subcontractors will be provided to companies currently being used by each individual property owner and several other potential contractors. A list of potential subcontractors to be used for hazardous waste disposal needs is included in Appendix 5. Subcontractors involved with the potential of contacting contaminated materials will be required to comply with 29 CFR 1910.120 OSHA regulations. 7.3 Health and Safety Plan A health and safety plan for the implementation of the proposed RCAP is included as Appendix 6. The plan is intended to provide adequate protection for the health and safety of H&N personnel and H&N subcontractors on-Site. 7.4 List of Interested Parties A list of property owners atop the 151 South Champlain Street related plume are included in Appendix 7. Due to the large number of properties impacted by the 151 South Champlain Street Site it is assumed that the City of Burlington and the VDEC will coordinate a comprehensive community meeting to present and discuss the RCAP. 7.5 Hazardous and Solid Waste Solid waste generated during the installation of the soil gas mitigation systems will be disposed of by a licensed waste hauler in a certified lined


50

landfill. Regulated and hazardous wastes generated will include soil cuttings, decontamination and sampling fluids. All potentially contaminated waste will be disposed of by a licensed hazardous waste disposal company as f-listed hazardous waste. All wastes will be stored, labeled and shipped in accordance with VDEC and federal regulations.

8.0 Cost Estimate A detailed cost estimate for the proposed Revised Corrective Action Plan detailed above, has been developed and is presented in Appendix 8. It has been assumed that no additional sub slab vapor mitigation systems will be needed once the Phase II monitoring and evaluation regime is completed. Long Term Operations and Management monitoring costs have been extended to 5 years. The need for additional monitoring will be determined at that time. No attempt to adjust costs for inflation or other economic factors has been made. H&N has attempted to provide sufficient detail to assure a conservative estimate of costs. However, the specific requests/needs of individual property owners for their soil gas mitigation systems may result in significant cost increases. Individual buildings have not been inspected to determine the complexity of piping and fan installation, floor covering repair/replacement, or to site individual sub slab depressurization wells. U:\PROJECTS\Hinsdale OFF-PROP 151 SoChampl\CAP\Corrective Action Plan Ver 8.doc

Project: 151 South ChamplainLocation: Burlington, Vermont

Ground Water Elevation (feet)

Table 1VDEC Site # 2003-3098

Sheet 1 of 1

Data PointLAG

Top of Casing

Previously Reported

Top of Casing Well Diameter Total Depth Top of Screen 01/28/03 10/12/04 10/25/04 08/02/05 09/13/05

MW-10 501.76 93.68 2.0 18.0 8.00 487.56 489.62 488.85 489.61

MW-11 502.94 94.87 2.0 24.0 14.00 486.50 488.94 488.14 489.00

MW-12 501.74 93.24 2.0 18.0 8.00 484.71 486.63 486.06 486.79

MW-101 503.03 94.97 1.5 20.0 10.00 487.49 486.99 487.56

MW-102 501.40 1.5 18.0 8.00 488.65

MW-103 500.06 92.05 1.5 15.0 5.00 486.38 <485.69 486.29

MW-103R 500.21 1.5 22.0 12.00 486.29

MW-104 500.02 92.01 1.5 15.0 5.00 486.67 <485.64 486.47

MW-104R 499.86 1.5 22.0 12.00 486.10

MW-105 90.89 1.5 15.0 5.00 485.34 <484.81

MW-105R 498.79 1.5 19.0 9.00 485.28 484.16

MW-106 89.91 1.5 15.0 5.00 485.36 484.13

MW-106R 498.04 1.5 20.0 10.00 485.35 484.28

MW-107 494.81 1.5 22.0 12.00 478.41 478.08

MW-108 492.72 1.5 22.0 12.00 478.92

MW-109 479.96 1.5 34.0 14.00 466.56

MW-110 493.25 1.5 22.0 12.00 474.55 474.40

MW-111 487.53 1.5 22.0 12.00 472.28

MW-112 470.71 1.5 13.0 3.00 465.69

MW-113 468.70 1.5 24.0 4.00 463.53

MW-114 489.27 1.5 22.0 12.00 472.18Lake

Champlain 465.70 457.80

VP-1 100.15 1.0 8.0 5.50

VP-2 506.50 98.70 1.0 11.0 9.50

VP-3 97.23 1.0 8.0 5.50

VP-4 505.76 97.67 1.0 11.0 9.50 <494.36

VP-5 95.85 1.0 11.0 9.50

VP-6 503.92 95.87 1.0 11.0 9.50 <492.72

VP-7 503.18 95.18 1.0 12.0 9.50

VP-8 501.88 93.81 1.0 12.0 9.50Notes: 1 - Elevation datum assumed2 - Reference elevation is elevation of top of PVC well casingLight Grey Cell = DRYDark Grey Cell = Inaccessible

Project: 151 South Champlain StreetLocation: Burlington, Vermont Soil Gas and Well Headspace Air Sample Results

ug/m3

Table 2VDEC Site #2003-3098

Sheet 1 of 5

EPA Region III ATC ATC H&N H&N LAG LAG LAG LAGRBC Table Field GC Summa Can. Field GC TO2 Field GC TO2 Field GC TO2Ambient Air 06/03 06/03 10/04 10/04 06/05 06/05 07/05 07/05

PID Reading ppm (v/v)Benzene 0.23Toluene 420Ethylbenzene 1,100m and o Xylenes 110Tetrachloroethene 0.31Trichloroethene 0.016

MW-10 Chloroform 77PID Reading ppm (v/v)

Benzene 0.23Toluene 420Ethylbenzene 1,100m and o Xylenes 110Tetrachloroethene 0.31Trichloroethene 0.016


Benzene 0.23Toluene 420Ethylbenzene 1,100m and o Xylenes 110Tetrachloroethene 0.31Trichloroethene 0.016


Benzene 0.23 137.2Toluene 420 101.7Ethylbenzene 1,100 ND/<87m and o Xylenes 110 ND/<174Tetrachloroethene 0.31 ND/<136Trichloroethene 0.016 128.9


Benzene 0.23 ND/<64Toluene 420 ND/<75Ethylbenzene 1,100 ND/<87m and o Xylenes 110 ND/<174Tetrachloroethene 0.31 61.0Trichloroethene 0.016 ND/<107


Benzene 0.23 41.5 ND/<4Toluene 420 ND/<75 6.0Ethylbenzene 1,100 ND/<87 ND/<4m and o Xylenes 110 ND/<174 ND/<4Tetrachloroethene 0.31 61.0 18.7Trichloroethene 0.016 80.5 ND/<4

MW-103 Chloroform 77 ND/<4PID Reading ppm (v/v)

Benzene 0.23 ND/<64 ND/<4Toluene 420 ND/<75 5.6Ethylbenzene 1,100 ND/<87 ND/<4m and o Xylenes 110 ND/<174 ND/<4Tetrachloroethene 0.31 ND/<136 ND/<4Trichloroethene 0.016 80.5 ND/<4

MW-104 Chloroform 77 46.6PID Reading ppm (v/v)

Benzene 0.23 ND/<64Toluene 420 ND/<75Ethylbenzene 1,100 ND/<87m and o Xylenes 110 ND/<174Tetrachloroethene 0.31 ND/<136Trichloroethene 0.016 ND/<107


Benzene 0.23 ND/<64Toluene 420 ND/<75Ethylbenzene 1,100 ND/<87m and o Xylenes 110 ND/<174Tetrachloroethene 0.31 ND/<136Trichloroethene 0.016 ND/<107

MW-106 Chloroform 77

NOTES:< - None detected at specified detection limitBlank Cell - No Sample Collected or Compound Not AnalyzedShaded Cell - Above RBC LevelItalics - Value Estimate Results Out of Calibration Range


ug/m3


Sheet 2 of 5


PID Reading ppm (v/v)Benzene 0.23Toluene 420Ethylbenzene 1,100m and o Xylenes 110Tetrachloroethene 0.31 ND/<7Trichloroethene 0.016 ND/<5

MP-1 Chloroform 77PID Reading ppm (v/v)

Benzene 0.23Toluene 420Ethylbenzene 1,100m and o Xylenes 110Tetrachloroethene 0.31 ND/<7Trichloroethene 0.016 ND/<5








Benzene 0.23Toluene 420Ethylbenzene 1,100m and o Xylenes 110Tetrachloroethene 0.31 2,577 30,014Trichloroethene 0.016 ND/<5 3,192


Benzene 0.23Toluene 420Ethylbenzene 1,100m and o Xylenes 110Tetrachloroethene 0.31 1,627Trichloroethene 0.016 ND/<5


Benzene 0.23Toluene 420Ethylbenzene 1,100m and o Xylenes 110Tetrachloroethene 0.31 11,528Trichloroethene 0.016 1,451


Benzene 0.23Toluene 420Ethylbenzene 1,100m and o Xylenes 110Tetrachloroethene 0.31 39,331 63,797Trichloroethene 0.016 13,973 31,912

MP-9 Chloroform



ug/m3


Sheet 3 of 5


PID Reading ppm (v/v)Benzene 0.23Toluene 420Ethylbenzene 1,100m and o Xylenes 110Tetrachloroethene 0.31 50.2Trichloroethene 0.016 ND/<5




Benzene 0.23 ND/<20Toluene 420 ND/<75Ethylbenzene 1,100 ND/<87m and o Xylenes 110 ND/<174Tetrachloroethene 0.31 366Trichloroethene 0.016 ND/<107

VP-1 Chloroform 77PID Reading ppm (v/v)


VP-2 Chloroform 77PID Reading ppm (v/v) 03/17/00

Benzene 0.23 ND/<64Toluene 420 37.7Ethylbenzene 1,100 ND/<87m and o Xylenes 110 ND/<174Tetrachloroethene 0.31 1,153Trichloroethene 0.016 ND/<107


Benzene 0.23 ND/<64Toluene 420 ND/<75Ethylbenzene 1,100 ND/<87m and o Xylenes 110 ND/<174Tetrachloroethene 0.31 610.3Trichloroethene 0.016 ND/<107


Benzene 0.23 ND/<64Toluene 420 ND/<75Ethylbenzene 1,100 ND/<87m and o Xylenes 110 ND/<174Tetrachloroethene 0.31 1,831Trichloroethene 0.016 ND/<107


Benzene 0.23 ND/<64 ND/<169Toluene 420 41.4 ND/<169Ethylbenzene 1,100 ND/<87 ND/<169m and o Xylenes 110 ND/<174 ND/<169Tetrachloroethene 0.31 8,816 4,850Trichloroethene 0.016 ND/<107 ND/<169

VP-6 Chloroform 77 ND/<169PID Reading ppm (v/v)

Benzene 0.23 ND/<64 ND/<18Toluene 420 41.4 70.1Ethylbenzene 1,100 ND/<87 ND/<18m and o Xylenes 110 ND/<174 ND/<18Tetrachloroethene 0.31 1,017 474.0Trichloroethene 0.016 ND/<107 ND/<18

VP-7 Chloroform 77 ND/<18PID Reading ppm (v/v)


VP-8 Chloroform 77



ug/m3


Sheet 4 of 5


PID Reading ppm (v/v) BGBenzene 0.23Toluene 420Ethylbenzene 1,100m and o Xylenes 110Tetrachloroethene 0.31 ND/<100Trichloroethene 0.016 ND/<100

SG-1; 5' Chloroform 77PID Reading ppm (v/v) BG
















SG-5; 10' Chloroform 77



ug/m3


Sheet 5 of 5


PID Reading ppm (v/v) BGBenzene 0.23Toluene 420Ethylbenzene 1,100m and o Xylenes 110Tetrachloroethene 0.31 ND/<100Trichloroethene 0.016 ND/<100







SG-7; 10' Chloroform 77PID Reading ppm (v/v) BG BG

Benzene 0.23 0.85Toluene 420 24.61Ethylbenzene 1,100 8.12m and o Xylenes 110 40.441,2,4-Trimethylbenzene 6.2 12.411,3,5-Trimethylbenzene 6.2 2.27Napthalene 3.3 1.67Tetrachloroethene 0.31 9,701 493.0Trichloroethene 0.016 ND/<100 1.34

SG-8; 5' Chloroform 77PID Reading ppm (v/v) BG BG

Benzene 0.23 0.74Toluene 420 11.23Ethylbenzene 1,100 2.51m and o Xylenes 110 12.211,2,4-Trimethylbenzene 6.2 2.071,3,5-Trimethylbenzene 6.2 0.71Napthalene 3.3 ND/<.67Tetrachloroethene 0.31 209 51.20Trichloroethene 0.016 ND/<100 5.75

SG-9; 10' Chloroform 77PID Reading ppm (v/v) BGBenzene 0.23Toluene 420Ethylbenzene 1,100m and o Xylenes 1101,2,4-Trimethylbenzene 6.21,3,5-Trimethylbenzene 6.2Napthalene 3.3Tetrachloroethene 0.31 ND/<100Trichloroethene 0.016 ND/<100PID Reading ppm (v/v) BGBenzene 0.23 7.09Toluene 420 50.49Ethylbenzene 1,100 5.21m and o Xylenes 110 22.111,2,4-Trimethylbenzene 6.2 2.571,3,5-Trimethylbenzene 6.2 0.91Napthalene 3.3 ND/<.52Tetrachloroethene 0.31 ND/<.52Trichloroethene 0.016 ND/<.52

SG-10; 15'

SG-11; 10'


Project: 151 South Champlain StreetLocation: Burlington, Vermont

Monitoring Well HeadspacePhotoionization Results (PID - ppm)

Table 3VDEC Site # 2003-3098

Sheet 1 of 1

Data Point 08/02/05

MW-10 BG

MW-11 11.7

MW-12 BG

MW-101 BG

MW-102 0.1

MW-103 BG

MW-103R 0.5

MW-104 BG

MW-104R 0.4

MW-105R 0.3

MW-106R 0.4

MW-107 1.2

MW-108 BG

MW-109 4.7

MW-110 1.7

MW-111 BG

MW-112 0.4

MW-113 3.0

MW-114 0.2

Catch Basin BG

Lake Sample BG

Notes:BG - BackgroundSL - Saturated Lamp


Field GC and Laboratory Soil Quality Results (ppb)


Sheet 1 of 6

Loca

tion

Depth

bgs (

ft)

PID (p

pm; v

/v)Ben

zene

Toluen

e

Ethylbe

nzen

e

Xylene

s

1,3,5-

Trimeth

ylben

zene

1,2,4-

Trimeth

ylben

zene

Naphth

alene

n-Buty

lbenz

ene

sec-B

utylbe

nzen

eter

t-Buty

lbenz

ene

1,2-D

ichlor

oben

zene

1,3-D

ichlor

oben

zene

1,4-D

ichlor

oben

zene

cis-1,

2-Dich

loroe

thylen

etra

ns-1,

2-Dich

loroe

thylen

Isopro

pylbe

nzen

ep-I

sopro

pylto

luene

n-Prop

lyben

zene

Styren

e

Tetrac

hloroe

thene

1,1,1-

Trichlo

roetha

neTric

hloroe

thene

Vinyl C

hlorid

eMTBE

TPH (ppm

; mg/K

g)

MW-10 1 -3' BG4 - 6' 1.0

MW-10C 9 - 11' 4.0 ND/<15 ND/<15 ND/<15 72.9 35.7 108 53.7 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<30 ND/<30 3.0914 - 16' BG

MW-11 0 - 2' BG4 - 6' BG

9 - 11' BG14 - 16' 216 - 18' BG20 - 22' BG

MW-12 0 - 2' BG4 - 6' BG

9 - 11' BG14 - 16' BG

SB-10 0 - 2' BG ND/<15 65.4 15.6 223 22.2 27.4 33.5 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 17.2 ND/<15 ND/<15 ND/<30 ND/<30 4.22 - 4' BG4 - 6' BG6 - 8' BG

8 - 10' BGSB-11 0 - 2' BG ND/<10 ND/<10 ND/<10 ND/<20 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 2,650 ND/<10 210 ND/<20 ND/<20 2.47

2 - 4' BG4 - 6' BG6 - 8' BG

MW-11E 8 - 10' 5.0 ND/<10 ND/<10 19.1 158 237 423 127 39.6 20.3 ND/<10 13.5 ND/<10 ND/<10 ND/<10 ND/<10 14.2 28.1 29.6 ND/<10 276 ND/<10 25.1 ND/<20 ND/<20 17.9SB-12 0 - 2' BG ND/<15 17.5 ND/<15 42.6 ND/<15 15.1 ND/<30 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 17.2 378 ND/<15 ND/<15 ND/<30 ND/<30 ND/<2

2 - 4' BG4 - 6' BG6 - 8' BG

8 - 10' BGSB-13 0 - 2' BG ND/<10 13.6 ND/<10 35.1 ND/<10 13.9 ND/<20 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 722 69.6 ND/<10 ND/<10 ND/<10 ND/<10 11,700 ND/<10 2,090 ND/<20 ND/<20 16.3

2 - 4' 3.04 - 6' BG6 - 8' 2.0

8 - 10' BGSB-14 0 - 2' BG ND/<15 94.5 ND/<15 ND/<30 ND/<15 ND/<15 49.8 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 236 20.2 ND/<15 ND/<30 ND/<30 ND/<2

2 - 4' BG4 - 6' BG6 - 8' BG

8 - 10' BGSB-15 0 - 2' BG ND/<15 80.3 69.7 561 111 104 ND/<30 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 23.7 ND/<15 ND/<15 ND/<30 ND/<30 ND/<2

2 - 4' BG4 - 6' BG6 - 8' BG

8 - 10' BGSB-16 0 - 4' BG ND/<15 ND/<15 ND/<15 ND/<30 ND/<15 ND/<15 ND/<30 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<15 ND/<30 ND/<30 ND/<2

4 - 8' BG8 - 10' BG

SB-17 0 - 4' BG ND/<20 ND/<20 ND/<20 ND/<40 ND/<20 ND/<20 ND/<40 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 75.8 ND/<40 ND/<40 ND/<24 - 8' BG

8 - 10' BGSB-18 0 - 4' BG ND/<20 ND/<20 ND/<20 ND/<40 ND/<20 ND/<20 ND/<40 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 ND/<20 22.3 ND/<20 ND/<20 ND/<40 ND/<40 2.25

4 - 6' BG6 - 8' BG

8 - 10' BGSB-19 0 - 2' 7.0 ND/<10 18.9 13.4 102.0 112.0 165.0 85.5 14.0 ND/<10 ND/<10 15.7 ND/<10 11.2 ND/<10 ND/<10 ND/<10 21.3 ND/<10 ND/<10 ND/<10 ND/<10 ND/<20 ND/<20 17.0

2 - 4' 2.04 - 8' BG ND/<10 ND/<10 ND/<10 ND/<20 ND/<10 ND/<10 ND/<20 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<10 ND/<20 ND/<20 ND/<2

8 - 10' BG

ppm - parts per millionPID - Photoionization DetectorBG - Background PID Readingppb - ug/kg - parts per billionND-non-detect




Sheet 2 of 6

Loca

tion

Depth

bgs (

ft)

PID (p

pm; v

/v)Ben

zene

Toluen

e

Ethylbe

nzen

e

Xylene

s

1,3,5-

Trimeth

ylben

zene

1,2,4-

Trimeth

ylben

zene

Naphth

alene

n-Buty

lbenz

ene

sec-B

utylbe

nzen

eter

t-Buty

lbenz

ene

1,2-D

ichlor

oben

zene

1,3-D

ichlor

oben

zene

1,4-D

ichlor

oben

zene

cis-1,

2-Dich

loroe

thylen

etra

ns-1,

2-Dich

loroe

thylen

Isopro

pylbe

nzen

ep-I

sopro

pylto

luene

n-Prop

lyben

zene

Styren

e

Tetrac

hloroe

thene

1,1,1-

Trichlo

roetha

neTric

hloroe

thene

Vinyl C

hlorid

eMTBE

TPH (ppm

; mg/K

g)

SB-20 0-4' BG ND/<5 ND/<5 ND/<54-8' BG ND/<5 ND/<5 ND/<5

8-12' BG ND/<5 ND/<5 ND/<512-16' BG ND/<5 ND/<5 ND/<516-20' BG ND/<5 ND/<5 ND/<520-24' BG ND/<5 ND/<5 ND/<524-28' BG ND/<5 ND/<5 ND/<5

SB-21 0 - 4' BG ND/<5 10.8 ND/<54 - 8' BG ND/<5 ND/<5 ND/<58 -12' BG ND/<5 ND/<5 ND/<5

12 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 ND/<5 40.720 - 24' BG ND/<5 ND/<5 ND/<5

SB-22 0 - 4' BG ND/<5 22 ND/<50 - 4' Lab ND/<12 ND/<12 ND/<12 ND/<24 ND/<12 ND/<12 ND/<24 ND/<12 ND/<12 ND/<12 ND/<12 ND/<12 ND/<12 ND/<12 ND/<12 ND/<12 ND/<12 ND/<12 ND/<12 503 ND/<12 ND/<12 ND/<24 ND/<24

4 - 8' BG ND/<5 ND/<5 ND/<54 - 8' Dup BG ND/<5 9.5 ND/<5

8 -12' BG ND/<5 15.9 ND/<512 -14' BG ND/<5 ND/<5 ND/<514 - 16' BG ND/<5 9.7 ND/<516 - 20' BG ND/<5 ND/<5 ND/<5

SB-23 0 - 4' BG ND/<5 ND/<5 ND/<54 - 8' BG ND/<5 ND/<5 ND/<58 -12' BG ND/<5 ND/<5 ND/<5

12 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 ND/<5 ND/<5


12 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 ND/<5 ND/<520 - 24' BG ND/<5 14.1 61.123' Lab 23.3 ND/<14 ND/<14 88.8 ND/<14 23 105 ND/<14 ND/<14 ND/<14 ND/<14 ND/<14 ND/<14 ND/<14 ND/<14 15.9 ND/<14 19.6 ND/<14 ND/<14 ND/<14 ND/<14 ND/<28 ND/<28


12 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 14 ND/<520 - 24' BG ND/<5 76.3 28.6

20 - 24' Dup BG ND/<5 75.8 30.7SB-26 0 - 4' BG ND/<5 ND/<5 ND/<5

4 - 8' BG ND/<5 ND/<5 ND/<58 -12' BG ND/<5 ND/<5 ND/<5

12 -16' BG ND/<5 ND/<5 ND/<512 - 16' Dup BG ND/<5 ND/<5 ND/<5

16 - 20' BG ND/<5 ND/<5 ND/<520 - 24' BG ND/<5 ND/<5 ND/<5

20 - 24' Lab ND/<15.0 ND/<15.0 ND/<15.0 ND/<30.0 ND/<15.0 ND/<15.0 ND/<30.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<30.0 ND/<30.0SB-27 0 - 4' BG ND/<5 ND/<5 ND/<5

0 - 4' Dup BG ND/<5 ND/<5 ND/<54 - 8' BG ND/<5 ND/<5 ND/<58 -12' BG ND/<5 ND/<5 ND/<5

12 -16' BG ND/<5 ND/<5 ND/<512 - 16' Lab ND/<14.0 ND/<14.0 ND/<14.0 ND/<28.0 ND/<14.0 ND/<14.0 ND/<28.0 ND/<14.0 ND/<14.0 ND/<14.0 ND/<14.0 ND/<14.0 ND/<14.0 ND/<14.0 ND/<14.0 ND/<14.0 ND/<14.0 ND/<14.0 ND/<14.0 ND/<14.0 ND/<14.0 ND/<14.0 ND/<28.0 ND/<28.0

16 - 17' BG ND/<5 ND/<5 ND/<517 - 20' BG ND/<5 ND/<5 ND/<523 - 24' BG ND/<5 ND/<5 ND/<5


12 -16' BG ND/<5 ND/<5 ND/<512 -16' Dup BG ND/<5 ND/<5 ND/<5

16 - 17' BG ND/<5 ND/<5 ND/<516 - 17' Lab ND/<13.0 ND/<13.0 ND/<13.0 ND/<26.0 ND/<13.0 ND/<13.0 ND/<26.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<26.0 ND/<26.0

17 - 20' BG ND/<5 ND/<5 ND/<520 - 24' BG 12.6 24.4 14





Sheet 3 of 6

Loca

tion

Depth

bgs (

ft)

PID (p

pm; v

/v)Ben

zene

Toluen

e

Ethylbe

nzen

e

Xylene

s

1,3,5-

Trimeth

ylben

zene

1,2,4-

Trimeth

ylben

zene

Naphth

alene

n-Buty

lbenz

ene

sec-B

utylbe

nzen

eter

t-Buty

lbenz

ene

1,2-D

ichlor

oben

zene

1,3-D

ichlor

oben

zene

1,4-D

ichlor

oben

zene

cis-1,

2-Dich

loroe

thylen

etra

ns-1,

2-Dich

loroe

thylen

Isopro

pylbe

nzen

ep-I

sopro

pylto

luene

n-Prop

lyben

zene

Styren

e

Tetrac

hloroe

thene

1,1,1-

Trichlo

roetha

neTric

hloroe

thene

Vinyl C

hlorid

eMTBE

TPH (ppm

; mg/K

g)


12 -16' BG 5.7 10.8 6.716 - 20' BG ND/<5 ND/<5 ND/<5

16 - 20' Dup BG ND/<5 ND/<5 ND/<520 - 24' BG 12.3 62.9 16.1

20 - 24' Lab ND/<13.0 ND/<13.0 ND/<13.0 ND/<26.0 ND/<13.0 ND/<13.0 ND/<26.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 58.4 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 ND/<13.0 289 ND/<13.0 119 ND/<26.0 ND/<26.0SB-30 0 - 4' BG ND/<5 ND/<5 ND/<5


12 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG 14.1 14.1 1020 - 24' BG 15.7 36.2 15.1



16 - 20' BG ND/<5 ND/<5 ND/<516 - 20' Lab ND/<17.0 ND/<17.0 ND/<17.0 ND/<34.0 ND/<17.0 ND/<17.0 ND/<34.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<34.0 ND/<34.0

20 - 24' BG ND/<5 ND/<5 ND/<5SB-32 0 - 4' BG


12 -16' BG ND/<5 37.1 ND/<516' BG ND/<5 52.1 11.6

16' Lab ND/<18.0 ND/<18.0 84.7 540 130 357 83.7 32.2 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 24.8 ND/<18.0 56.1 ND/<18.0 38.5 ND/<18.0 ND/<18.0 ND/<36.0 ND/<36.016 - 20' BG ND/<5 16.8 6.720 - 24' BG ND/<25 21.5 ND/<25

20 - 24' Dup BG ND/<25 11.5 ND/<25SB-33 0 - 4' BG ND/<5 ND/<5 ND/<5


12 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 56 7.6

17' BG ND/<5 54 9.320 - 24' BG ND/<25 300 64.4

20 - 24' Lab 276 ND/<19.0 125 493 275 436 195 79.6 21.7 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 60.3 20.6 115 ND/<19.0 143 ND/<19.0 ND/<19.0 ND/<38.0 ND/<38.0SB-34 0 - 4' BG ND/<5 ND/<5 ND/<5


12 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 56 7.6

16 - 20' Lab ND/<15.0 ND/<15.0 ND/<15.0 ND/<30.0 ND/<15.0 ND/<15.0 ND/<30.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<15.0 ND/<30.0 ND/<30.020 - 22' BG 21.5 7.43 9.33

20 - 22' Dup BG 15.4 ND/<5 15.420 - 24' BG 27.6 ND/<5 ND/<5


12 -16' BG 7.5 11.6 8.016 - 20' BG 8.1 47.5 12.620 - 24' BG ND/<5 ND/<5 ND/<5



16 - 20' BG 11.7 34.2 17.3SB-37 0 - 4' BG ND/<5 ND/<5 ND/<5


12 -16' 1.1 ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 ND/<5 ND/<520 - 24' BG ND/<5 ND/<5 ND/<5

20 - 24' Lab ND/<18.0 ND/<18.0 ND/<18.0 ND/<36.0 ND/<18.0 ND/<18.0 ND/<36.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<36.0 ND/<36.0





Sheet 4 of 6

Loca

tion

Depth

bgs (

ft)

PID (p

pm; v

/v)Ben

zene

Toluen

e

Ethylbe

nzen

e

Xylene

s

1,3,5-

Trimeth

ylben

zene

1,2,4-

Trimeth

ylben

zene

Naphth

alene

n-Buty

lbenz

ene

sec-B

utylbe

nzen

eter

t-Buty

lbenz

ene

1,2-D

ichlor

oben

zene

1,3-D

ichlor

oben

zene

1,4-D

ichlor

oben

zene

cis-1,

2-Dich

loroe

thylen

etra

ns-1,

2-Dich

loroe

thylen

Isopro

pylbe

nzen

ep-I

sopro

pylto

luene

n-Prop

lyben

zene

Styren

e

Tetrac

hloroe

thene

1,1,1-

Trichlo

roetha

neTric

hloroe

thene

Vinyl C

hlorid

eMTBE

TPH (ppm

; mg/K

g)

SB-38 0 - 4' BG ND/<5 ND/<5 ND/<54 - 8' BG ND/<5 ND/<5 ND/<58 -12' 0.6 ND/<5 ND/<5 ND/<5


16 - 20' Dup BG ND/<5 ND/<5 ND/<520 - 24' BG ND/<5 ND/<5 ND/<5

20 - 24' Lab 32 ND/<18.0 ND/<18.0 192 ND/<18.0 ND/<18.0 ND/<36.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 44.3 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<18.0 ND/<36.0 ND/<36.0SB-39 0 - 4' BG ND/<5 ND/<5 ND/<5


12 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 ND/<5 ND/<520 - 24' BG ND/<5 8.6 ND/<5


12 -16' BG ND/<5 ND/<5 ND/<516 - 20' 295 1,580 1,950 208

16 - 20' Dup 6,740 1,950 ND/<125017 - 18' 295 1,040 451 74

17 - 18' Lab ND/<26.0 143 3,070 129,000 56,400 165,000 15,400 14,600 4,390 275 ND/<26.0 ND/<26.0 ND/<26.0 ND/<26.0 ND/<26.0 8,290 4,790 22,800 ND/<26.0 13,100 ND/<26.0 ND/<26.0 ND/<52.0 ND/<52.020 - 24' 15


12 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 7.0 ND/<520 - 24' BG ND/<5 8.6 ND/<5


12 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 27.1 ND/<520 - 24' BG ND/<5 9.6 ND/<5


12 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG 15.2 120 31.1

16 - 20' Lab ND/<17.0 ND/<17.0 ND/<17.0 ND/<34.0 ND/<17.0 ND/<17.0 ND/<34.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 37.5 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 ND/<17.0 625 ND/<17.0 133 ND/<17.0 ND/<34.020 - 24' BG 10.5 33.7 6.7

20 - 24' Dup BG 10.3 37.3 7.0SB-44 0 - 4' BG ND/<5 ND/<5 ND/<5


12 -16' BG ND/<5 ND/<5 ND/<516 - 20' 62 16.1 8.1 ND/<5

19' 62 ND/<250 367 ND/<25020 - 24' BG ND/<5 ND/<5 ND/<5



22.5' 23 ND/<5 ND/<5 ND/<522.5' Dup 23 ND/<5 ND/<5 ND/<523 - 24' 23 ND/<5 ND/<5 ND/<5

20 - 24' Lab ND/<16.0 ND/<16.0 ND/<16.0 ND/<32.0 ND/<16.0 ND/<16.0 ND/<32.0 ND/<16.0 ND/<16.0 ND/<16.0 ND/<16.0 ND/<16.0 ND/<16.0 ND/<16.0 ND/<16.0 ND/<16.0 ND/<16.0 ND/<16.0 ND/<16.0 49.8 ND/<16.0 ND/<16.0 ND/<32.0 ND/<32.024 - 28' BG ND/<5 ND/<5 ND/<5





Sheet 5 of 6

Loca

tion

Depth

bgs (

ft)

PID (p

pm; v

/v)Ben

zene

Toluen

e

Ethylbe

nzen

e

Xylene

s

1,3,5-

Trimeth

ylben

zene

1,2,4-

Trimeth

ylben

zene

Naphth

alene

n-Buty

lbenz

ene

sec-B

utylbe

nzen

eter

t-Buty

lbenz

ene

1,2-D

ichlor

oben

zene

1,3-D

ichlor

oben

zene

1,4-D

ichlor

oben

zene

cis-1,

2-Dich

loroe

thylen

etra

ns-1,

2-Dich

loroe

thylen

Isopro

pylbe

nzen

ep-I

sopro

pylto

luene

n-Prop

lyben

zene

Styren

e

Tetrac

hloroe

thene

1,1,1-

Trichlo

roetha

neTric

hloroe

thene

Vinyl C

hlorid

eMTBE

TPH (ppm

; mg/K

g)


12 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 ND/<5 ND/<520 - 24' BG ND/<5 31.7 19.724 - 28' BG ND/<5 24.2 12.728 - 32' BG ND/<5 ND/<5 ND/<5

28 - 32' Dup BG ND/<5 ND/<5 ND/<5SB-47 0 - 4' BG ND/<5 ND/<5 ND/<5

4 - 8' BG ND/<5 ND/<5 ND/<54 - 8' Lab ND/<20.0 ND/<20.0 ND/<20.0 ND/<40.0 ND/<20.0 ND/<20.0 ND/<40.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 38.2 ND/<20.0 ND/<20.0 ND/<40.0 ND/<40.0

8 -12' BG ND/<5 ND/<5 ND/<512 -16' BG ND/<5 ND/<5 ND/<5

SB-48 0 - 4' BG ND/<5 ND/<5 ND/<54 - 8' BG ND/<5 ND/<5 ND/<58 -12' BG ND/<5 41.5 7.9

12 -16' BG ND/<5 ND/<5 ND/<5SB-49 0 - 4' BG ND/<5 ND/<5 ND/<5


12 -16' BG ND/<5 ND/<5 ND/<5SB-50 0 - 4' BG ND/<5 ND/<5 ND/<5


8 - 12' Lab ND/<28.0 133 132 ND/<56.0 ND/<28.0 ND/<28.0 ND/<56.0 ND/<28.0 ND/<28.0 ND/<28.0 ND/<28.0 ND/<28.0 ND/<28.0 ND/<28.0 ND/<28.0 ND/<28.0 73.6 ND/<28.0 ND/<28.0 ND/<28.0 ND/<28.0 ND/<28.0 ND/<56.0 ND/<56.012 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 ND/<5 ND/<5

SB-51 0 - 4' BG ND/<5 20.4 ND/<50 - 4' Lab ND/<10.0 ND/<10.0 ND/<10.0 ND/<20.0 ND/<10.0 ND/<10.0 ND/<20.0 ND/<10.0 ND/<10.0 ND/<10.0 ND/<10.0 ND/<10.0 ND/<10.0 ND/<10.0 ND/<10.0 ND/<10.0 ND/<10.0 ND/<10.0 ND/<10.0 774 ND/<10.0 70.4 ND/<20.0 ND/<20.0

4 - 8' BG ND/<5 9.0 ND/<58 -12' 1.4 ND/<5 13.3 ND/<5

8 -12' Dup 1.4 ND/<5 10.8 ND/<512 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 ND/<5 ND/<5

21' BG ND/<5 ND/<5 ND/<520 - 24' BG ND/<5 ND/<5 ND/<5

SB-52 0 - 4' BG ND/<5 8.9 ND/<54 - 8' BG ND/<5 5.9 ND/<5

8' BG ND/<5 6.0 ND/<58 -12' BG ND/<5 ND/<5 ND/<5

12 -16' BG ND/<5 5.3 ND/<516 - 20' BG ND/<5 ND/<5 ND/<520 - 24' 1.0 ND/<5 ND/<5 ND/<524 - 28' BG ND/<5 ND/<5 ND/<5

SB-53 0 - 4' BG ND/<5 5.4 48.84 - 8' BG ND/<5 15.5 95.78 -12' BG ND/<5 15.7 20.4

8 -12' Dup BG ND/<5 21.8 28.58 - 12' Lab ND/<16.0 26.8 ND/<16.0 ND/<32.0 ND/<16.0 ND/<16.0 ND/<32.0 ND/<16.0 ND/<16.0 ND/<16.0 ND/<16.0 ND/<16.0 ND/<16.0 ND/<16.0 ND/<16.0 ND/<16.0 25.4 ND/<16.0 ND/<16.0 63.3 ND/<16.0 59.6 ND/<32.0 ND/<32.0

12 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 ND/<5 ND/<520 - 24' BG ND/<5 ND/<5 ND/<524 - 28' BG ND/<5 ND/<5 ND/<5

SB-54 0 - 4' BG ND/<5 5.4 48.84 - 8' BG ND/<5 15.5 95.78 -12' BG ND/<5 ND/<5 6.0

8 -12' Dup BG ND/<5 ND/<5 ND/<512 -16' BG ND/<5 5.0 6.816 - 20' BG ND/<5 7.2 1620 - 24' BG ND/<5 ND/<5 5.824 - 28' BG ND/<5 ND/<5 ND/<5





Sheet 6 of 6

Loca

tion

Depth

bgs (

ft)

PID (p

pm; v

/v)Ben

zene

Toluen

e

Ethylbe

nzen

e

Xylene

s

1,3,5-

Trimeth

ylben

zene

1,2,4-

Trimeth

ylben

zene

Naphth

alene

n-Buty

lbenz

ene

sec-B

utylbe

nzen

eter

t-Buty

lbenz

ene

1,2-D

ichlor

oben

zene

1,3-D

ichlor

oben

zene

1,4-D

ichlor

oben

zene

cis-1,

2-Dich

loroe

thylen

etra

ns-1,

2-Dich

loroe

thylen

Isopro

pylbe

nzen

ep-I

sopro

pylto

luene

n-Prop

lyben

zene

Styren

e

Tetrac

hloroe

thene

1,1,1-

Trichlo

roetha

neTric

hloroe

thene

Vinyl C

hlorid

eMTBE

TPH (ppm

; mg/K

g)


12 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 ND/<5 ND/<520 - 24' BG ND/<5 ND/<5 ND/<5

20 - 24' Lab ND/<12.0 18.5 ND/<12.0 ND/<24.0 ND/<12.0 ND/<12.0 ND/<24.0 ND/<12.0 ND/<12.0 ND/<12.0 ND/<12.0 ND/<12.0 ND/<12.0 ND/<12.0 ND/<12.0 ND/<12.0 ND/<12.0 ND/<12.0 ND/<12.0 ND/<12.0 ND/<12.0 ND/<12.0 ND/<24.0 ND/<24.024 - 28' BG ND/<5 ND/<5 ND/<5


12 -16' BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 ND/<5 5.8

16 - 20' Dup BG ND/<5 ND/<5 ND/<520 - 24' BG ND/<5 ND/<5 13.624 - 28' BG ND/<5 ND/<5 ND/<5

24 - 28' Lab ND/<24.0 41.7 ND/<24.0 ND/<48.0 ND/<24.0 ND/<24.0 ND/<48.0 ND/<24.0 ND/<24.0 ND/<24.0 ND/<24.0 ND/<24.0 ND/<24.0 ND/<24.0 ND/<24.0 ND/<24.0 ND/<24.0 ND/<24.0 ND/<24.0 ND/<24.0 ND/<24.0 ND/<24.0 ND/<48.0 ND/<48.0SB-57 0 - 4' BG ND/<5 ND/<5 ND/<5



16 - 20' BG ND/<5 ND/<5 ND/<520 - 24' BG ND/<5 7.1 ND/<5

20 - 24' Lab ND/<20.0 29.5 ND/<20.0 ND/<40.0 ND/<20.0 ND/<20.0 ND/<40.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 ND/<20.0 34.5 ND/<20.0 ND/<20.0 ND/<40.0 ND/<40.024 - 28' BG ND/<5 ND/<5 ND/<528 - 32' BG ND/<5 ND/<5 6.4

28 - 32' Dup BG ND/<5 ND/<5 ND/<532 - 36' BG ND/<5 ND/<5 ND/<5


8 - 12' Lab ND/<19.0 28.2 ND/<19.0 ND/<38.0 ND/<19.0 ND/<19.0 ND/<38.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<38.0 ND/<38.012 -16' BG ND/<5 ND/<5 ND/<5

12 -16' Dup BG ND/<5 ND/<5 ND/<516 - 20' BG ND/<5 ND/<5 9.320 - 24' BG ND/<5 ND/<5 ND/<524 - 28' BG ND/<5 ND/<5 ND/<5

24 - 28' Lab ND/<19.0 22.4 ND/<19.0 ND/<38.0 ND/<19.0 ND/<19.0 ND/<38.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<19.0 ND/<38.0 ND/<38.0


Project: 151 South Champlain StreetLocation: Burlington, Vermont Ground Water Quality Results (ppb)


Sheet 1 of 8ATC H&N LAG

Data Point Compound *GQES 01/14/03 10/25/04 08/02/05Benzene 5 ND/<1.0 ND/<1.0 ND/<1.0n-Butylbenzene ND/<1.0 ND/<1.0sec-Butylbenzene ND/<1.0 ND/<1.0Chlorobenzene 100 ND/<1.0 ND/<1.0 ND/<1.01,2-Dibromoethane ND/<2.0 ND/<2.01,2-Dichloroethane 5 ND/<1.0 ND/<1.0cis-1,2-Dichloroethene (DCE) 70 ND/<1.0 ND/<1.0 ND/<5.0Ethylbenzene 700 ND/<1.0 ND/<1.0 ND/<1.0Isopropylbenzene ND/<1.0 ND/<1.0 ND/<5.0p-Isopropyltoluene ND/<1.0 ND/<1.0 ND/<5.0Methyl-t-butylether (MtBE) 40 ND/<2.0 ND/<2.0 ND/<1.0Naphthalene 20 ND/<2.0 ND/<2.0 ND/<2.0n-Propylbenzene ND/<1.0 ND/<1.0 ND/<5.0Tetrachloroethene (PCE) 5 ND/<1.0 ND/<1.0 1.1Toluene 1000 1.4 ND/<1.0 ND/<1.0Trichloroethene (TCE) 5 ND/<1.0 ND/<1.0 ND/<1.01,2,4-Trimethylbenzene 5 2.5 ND/<1.0 ND/<5.01,3,5-Trimethylbenzene 4 1.2 ND/<1.0 ND/<5.0Xylenes 10,000 7.2 ND/<2.0 ND/<2.0Benzene 5 ND/<1.0 ND/<1.0 ND/<50.0n-Butylbenzene ND/<1.0 ND/<1.0sec-Butylbenzene ND/<1.0 ND/<1.0Chlorobenzene 100 ND/<1.0 ND/<1.0 621,2-Dibromoethane ND/<2.0 ND/<2.01,2-Dichloroethane 5 ND/<1.0 ND/<1.0cis-1,2-Dichloroethene (DCE) 70 ND/<1.0 ND/<1.0 ND/<250Ethylbenzene 700 ND/<1.0 ND/<1.0 ND/<50Isopropylbenzene ND/<1.0 ND/<1.0 ND/<250p-Isopropyltoluene ND/<1.0 ND/<1.0 ND/<250Methyl-t-butylether (MtBE) 40 ND/<2.0 ND/<2.0 ND/<50Naphthalene 20 ND/<2.0 ND/<2.0 ND/<250n-Propylbenzene ND/<1.0 ND/<1.0 ND/<250Tetrachloroethene (PCE) 5 68.8 4,010 2,400Toluene 1000 ND/<1.0 ND/<1.0 ND/<50Trichloroethene (TCE) 5 ND/<1.0 ND/<1.0 ND/<501,2,4-Trimethylbenzene 5 ND/<1.0 ND/<1.0 ND/<2501,3,5-Trimethylbenzene 4 ND/<1.0 ND/<1.0 ND/<250Xylenes 10,000 ND/<2.0 ND/<2.0 ND/<100Benzene 5 ND/<1.0 ND/<1.0 ND/<1.0n-Butylbenzene ND/<1.0 ND/<1.0sec-Butylbenzene ND/<1.0 ND/<1.0Chlorobenzene 100 ND/<1.0 ND/<1.0 ND/<1.01,2-Dibromoethane ND/<2.0 ND/<2.01,2-Dichloroethane 5 ND/<1.0 ND/<1.0cis-1,2-Dichloroethene (DCE) 70 2.4 ND/<1.0 ND/<5.0Ethylbenzene 700 ND/<1.0 ND/<1.0 ND/<1.0Isopropylbenzene ND/<1.0 ND/<1.0 ND/<5.0p-Isopropyltoluene ND/<1.0 ND/<1.0 ND/<5.0Methyl-t-butylether (MtBE) 40 ND/<2.0 ND/<2.0 5.6Naphthalene 20 ND/<2.0 ND/<2.0 ND/<5.0n-Propylbenzene ND/<1.0 ND/<1.0 ND/<5.0Tetrachloroethene (PCE) 5 12.8 1.9 4.2Toluene 1000 ND/<1.0 ND/<1.0 ND/<1.0Trichloroethene (TCE) 5 4.1 ND/<1.0 ND/<1.01,2,4-Trimethylbenzene 5 ND/<1.0 ND/<1.0 ND/<5.01,3,5-Trimethylbenzene 4 ND/<1.0 ND/<1.0 ND/<5.0Xylenes 10,000 ND/<2.0 ND/<2.0 ND/<2.0

MW-10

MW-11

MW-12

NOTES:< - Contaminant not detected at specified detection limit




Data Point Compound *GQES 01/14/03 10/25/04 08/02/05Benzene 5 610 1,900n-Butylbenzene ND/<1.0sec-Butylbenzene ND/<1.0Chlorobenzene 100 ND/<1.0 601,2-Dibromoethane 24.31,2-Dichloroethane 5 6cis-1,2-Dichloroethene (DCE) 70 ND/<1.0 ND/<250Ethylbenzene 700 27.7 410Isopropylbenzene ND/<1.0 ND/<250p-Isopropyltoluene ND/<1.0 ND/<250Methyl-t-butylether (MtBE) 40 ND/<2.0 ND/<50Naphthalene 20 3.8 ND/<250n-Propylbenzene ND/<1.0 ND/<250Tetrachloroethene (PCE) 5 1.9 ND/<50Toluene 1000 53.9 980Trichloroethene (TCE) 5 ND/<1.0 ND/<501,2,4-Trimethylbenzene 5 8.1 3701,3,5-Trimethylbenzene 4 2.6 ND/<250Xylenes 10,000 128 1,600Benzene 5 ND/<1.0 ND/<1.0n-Butylbenzene ND/<1.0sec-Butylbenzene ND/<1.0Chlorobenzene 100 ND/<1.0 ND/<1.01,2-Dibromoethane ND/<2.01,2-Dichloroethane 5 ND/<1.0cis-1,2-Dichloroethene (DCE) 70 ND/<1.0 ND/<5.0Ethylbenzene 700 ND/<1.0 ND/<1.0Isopropylbenzene ND/<1.0 ND/<5.0p-Isopropyltoluene ND/<1.0 ND/<5.0Methyl-t-butylether (MtBE) 40 ND/<2.0 ND/<1.0Naphthalene 20 ND/<2.0 ND/<5.0n-Propylbenzene ND/<1.0 ND/<5.0Tetrachloroethene (PCE) 5 9 9.6Toluene 1000 ND/<1.0 ND/<1.0Trichloroethene (TCE) 5 ND/<1.0 ND/<1.01,2,4-Trimethylbenzene 5 ND/<1.0 ND/<5.01,3,5-Trimethylbenzene 4 ND/<1.0 ND/<5.0Xylenes 10,000 ND/<2.0 ND/<2.0Benzene 5 ND/<1.0 ND/<10n-Butylbenzene ND/<1.0sec-Butylbenzene ND/<1.0Chlorobenzene 100 ND/<1.0 121,2-Dibromoethane ND/<2.01,2-Dichloroethane 5 ND/<1.0cis-1,2-Dichloroethene (DCE) 70 ND/<1.0 ND/<50Ethylbenzene 700 ND/<1.0 ND/<10Isopropylbenzene ND/<1.0 ND/<50p-Isopropyltoluene ND/<1.0 ND/<50Methyl-t-butylether (MtBE) 40 ND/<2.0 ND/<10Naphthalene 20 ND/<2.0 ND/<50n-Propylbenzene ND/<1.0 ND/<50Tetrachloroethene (PCE) 5 626 390Toluene 1000 ND/<1.0 ND/<10Trichloroethene (TCE) 5 ND/<1.0 ND/<101,2,4-Trimethylbenzene 5 ND/<1.0 ND/<501,3,5-Trimethylbenzene 4 ND/<1.0 ND/<50Xylenes 10,000 ND/<2.0 ND/<20

MW-102

MW-103 / MW-103R

MW-101





Data Point Compound *GQES 01/14/03 10/25/04 08/02/05Benzene 5 ND/<1.0 ND/<1.0n-Butylbenzene 3.7sec-Butylbenzene 7.0Chlorobenzene 100 ND/<1.0 ND/<1.01,2-Dibromoethane ND/<2.01,2-Dichloroethane 5 ND/<1.0cis-1,2-Dichloroethene (DCE) 70 ND/<1.0 ND/<5.0Ethylbenzene 700 ND/<1.0 ND/<1.0Isopropylbenzene 5.9 ND/<5.0p-Isopropyltoluene 9.0 ND/<5.0Methyl-t-butylether (MtBE) 40 ND/<2.0 ND/<1.0Naphthalene 20 23.8 ND/<5.0n-Propylbenzene 9.4 ND/<5.0Tetrachloroethene (PCE) 5 ND/<1.0 5.0Toluene 1000 1.1 ND/<1.0Trichloroethene (TCE) 5 ND/<1.0 ND/<1.01,2,4-Trimethylbenzene 5 27 ND/<5.01,3,5-Trimethylbenzene 4 17.3 ND/<5.0Xylenes 10,000 ND/<2.0 ND/<2.0Benzene 5 ND/<1.0 ND/<1.0n-Butylbenzene ND/<1.0sec-Butylbenzene ND/<1.0Chlorobenzene 100 ND/<1.0 ND/<1.01,2-Dibromoethane ND/<2.01,2-Dichloroethane 5 ND/<1.0cis-1,2-Dichloroethene (DCE) 70 ND/<1.0 ND/<5.0Ethylbenzene 700 ND/<1.0 ND/<1.0Isopropylbenzene ND/<1.0 ND/<5.0p-Isopropyltoluene ND/<1.0 ND/<5.0Methyl-t-butylether (MtBE) 40 ND/<2.0 ND/<1.0Naphthalene 20 ND/<2.0 ND/<5.0n-Propylbenzene ND/<1.0 ND/<5.0Tetrachloroethene (PCE) 5 ND/<1.0 1.2Toluene 1000 ND/<1.0 ND/<1.0Trichloroethene (TCE) 5 ND/<1.0 ND/<1.01,2,4-Trimethylbenzene 5 ND/<1.0 ND/<5.01,3,5-Trimethylbenzene 4 ND/<1.0 ND/<5.0Xylenes 10,000 ND/<2.0 ND/<2.0Benzene 5 ND/<1.0 ND/<1.0n-Butylbenzene ND/<1.0sec-Butylbenzene ND/<1.0Chlorobenzene 100 ND/<1.0 ND/<1.01,2-Dibromoethane ND/<2.01,2-Dichloroethane 5 ND/<1.0cis-1,2-Dichloroethene (DCE) 70 ND/<1.0 17.0Ethylbenzene 700 ND/<1.0 ND/<1.0Isopropylbenzene ND/<1.0 ND/<5.0p-Isopropyltoluene ND/<1.0 ND/<5.0Methyl-t-butylether (MtBE) 40 ND/<2.0 ND/<1.0Naphthalene 20 ND/<2.0 ND/<5.0n-Propylbenzene ND/<1.0 ND/<5.0Tetrachloroethene (PCE) 5 2.6 20.0Toluene 1000 ND/<1.0 ND/<1.0Trichloroethene (TCE) 5 ND/<1.0 12.01,2,4-Trimethylbenzene 5 ND/<1.0 ND/<5.01,3,5-Trimethylbenzene 4 ND/<1.0 ND/<5.0Xylenes 10,000 ND/<2.0 ND/<2.0

MW-106 / MW-106R

MW-104 / MW-104R

MW-105 / MW-105R





Data Point Compound *GQES 01/14/03 10/25/04 08/02/05Benzene 5 880n-Butylbenzenesec-ButylbenzeneChlorobenzene 100 64.01,2-Dibromoethane1,2-Dichloroethane 5cis-1,2-Dichloroethene (DCE) 70 ND/<250Ethylbenzene 700 230Isopropylbenzene ND/<250p-Isopropyltoluene ND/<250Methyl-t-butylether (MtBE) 40 ND/<50Naphthalene 20 230n-Propylbenzene ND/<250Tetrachloroethene (PCE) 5 280Toluene 1000 39Trichloroethene (TCE) 5 ND/<501,2,4-Trimethylbenzene 5 5201,3,5-Trimethylbenzene 4 350Xylenes 10,000 1,175Benzene 5 ND/<1.0n-Butylbenzenesec-ButylbenzeneChlorobenzene 100 ND/<1.01,2-Dibromoethane1,2-Dichloroethane 5cis-1,2-Dichloroethene (DCE) 70 24Ethylbenzene 700 ND/<1.0Isopropylbenzene ND/<5.0p-Isopropyltoluene ND/<5.0Methyl-t-butylether (MtBE) 40 1.4Naphthalene 20 ND/<5.0n-Propylbenzene ND/<5.0Tetrachloroethene (PCE) 5 25Toluene 1000 ND/<1.0Trichloroethene (TCE) 5 211,2,4-Trimethylbenzene 5 ND/<5.01,3,5-Trimethylbenzene 4 ND/<5.0Xylenes 10,000 ND/<2.0Benzene 5 ND/<1.0n-Butylbenzenesec-ButylbenzeneChlorobenzene 100 ND/<1.01,2-Dibromoethane1,2-Dichloroethane 5cis-1,2-Dichloroethene (DCE) 70 ND/<5.0Ethylbenzene 700 ND/<1.0Isopropylbenzene ND/<5.0p-Isopropyltoluene ND/<5.0Methyl-t-butylether (MtBE) 40 1.1Naphthalene 20 ND/<5.0n-Propylbenzene ND/<5.0Tetrachloroethene (PCE) 5 3.0Toluene 1000 ND/<1.0Trichloroethene (TCE) 5 171,2,4-Trimethylbenzene 5 ND/<5.01,3,5-Trimethylbenzene 4 ND/<5.0Xylenes 10,000 ND/<2.0

MW-107

MW-108

MW-109





Data Point Compound *GQES 01/14/03 10/25/04 08/02/05Benzene 5 ND/<1.0n-Butylbenzenesec-ButylbenzeneChlorobenzene 100 ND/<1.01,2-Dibromoethane1,2-Dichloroethane 5cis-1,2-Dichloroethene (DCE) 70 ND/<5.0Ethylbenzene 700 ND/<1.0Isopropylbenzene ND/<5.0p-Isopropyltoluene ND/<5.0Methyl-t-butylether (MtBE) 40 13Naphthalene 20 ND/<5.0n-Propylbenzene ND/<5.0Tetrachloroethene (PCE) 5 ND/<1.0Toluene 1000 ND/<1.0Trichloroethene (TCE) 5 ND/<1.01,2,4-Trimethylbenzene 5 ND/<5.01,3,5-Trimethylbenzene 4 ND/<5.0Xylenes 10,000 ND/<2.0Benzene 5 ND/<1.0n-Butylbenzenesec-ButylbenzeneChlorobenzene 100 ND/<1.01,2-Dibromoethane1,2-Dichloroethane 5cis-1,2-Dichloroethene (DCE) 70 ND/<5Ethylbenzene 700 1.3Isopropylbenzene 5.8p-Isopropyltoluene ND/<5.0Methyl-t-butylether (MtBE) 40 1.5Naphthalene 20 5.6n-Propylbenzene 6.0Tetrachloroethene (PCE) 5 22Toluene 1000 ND/<1.0Trichloroethene (TCE) 5 ND/<1.01,2,4-Trimethylbenzene 5 201,3,5-Trimethylbenzene 4 14Xylenes 10,000 5.7Benzene 5 ND/<1.0n-Butylbenzenesec-ButylbenzeneChlorobenzene 100 ND/<1.01,2-Dibromoethane1,2-Dichloroethane 5cis-1,2-Dichloroethene (DCE) 70 6.0Ethylbenzene 700 ND/<1.0Isopropylbenzene ND/<5.0p-Isopropyltoluene ND/<5.0Methyl-t-butylether (MtBE) 40 1.8Naphthalene 20 ND/<5.0n-Propylbenzene ND/<5.0Tetrachloroethene (PCE) 5 15Toluene 1000 ND/<1.0Trichloroethene (TCE) 5 7.81,2,4-Trimethylbenzene 5 ND/<5.01,3,5-Trimethylbenzene 4 ND/<5.0Xylenes 10,000 ND/<2.0

MW-110

MW-111

MW-112





Data Point Compound *GQES 01/14/03 10/25/04 08/02/05Benzene 5 ND/<1.0n-Butylbenzenesec-ButylbenzeneChlorobenzene 100 ND/<1.01,2-Dibromoethane1,2-Dichloroethane 5cis-1,2-Dichloroethene (DCE) 70 ND/<1.0Ethylbenzene 700 ND/<1.0Isopropylbenzene ND/<5.0p-Isopropyltoluene ND/<5.0Methyl-t-butylether (MtBE) 40 ND/<1.0Naphthalene 20 ND/<5.0n-Propylbenzene ND/<5.0Tetrachloroethene (PCE) 5 3.0Toluene 1000 ND/<1.0Trichloroethene (TCE) 5 121,2,4-Trimethylbenzene 5 ND/<5.01,3,5-Trimethylbenzene 4 ND/<5.0Xylenes 10,000 ND/<2.0Benzene 5 ND/<1.0n-Butylbenzenesec-ButylbenzeneChlorobenzene 100 ND/<1.01,2-Dibromoethane1,2-Dichloroethane 5cis-1,2-Dichloroethene (DCE) 70 ND/<1.0Ethylbenzene 700 ND/<1.0Isopropylbenzene ND/<5.0p-Isopropyltoluene ND/<5.0Methyl-t-butylether (MtBE) 40 ND/<1.0Naphthalene 20 ND/<5.0n-Propylbenzene ND/<5.0Tetrachloroethene (PCE) 5 20Toluene 1000 ND/<1.0Trichloroethene (TCE) 5 1.81,2,4-Trimethylbenzene 5 ND/<5.01,3,5-Trimethylbenzene 4 ND/<5.0Xylenes 10,000 ND/<2.0Benzene 5 ND/<1.0n-Butylbenzenesec-ButylbenzeneChlorobenzene 100 ND/<1.01,2-Dibromoethane1,2-Dichloroethane 5cis-1,2-Dichloroethene (DCE) 70 ND/<1.0Ethylbenzene 700 ND/<1.0Isopropylbenzene ND/<5.0p-Isopropyltoluene ND/<5.0Methyl-t-butylether (MtBE) 40 ND/<1.0Naphthalene 20 ND/<5.0n-Propylbenzene ND/<5.0Tetrachloroethene (PCE) 5 ND/<1.0Toluene 1000 1.4Trichloroethene (TCE) 5 ND/<1.01,2,4-Trimethylbenzene 5 ND/<5.01,3,5-Trimethylbenzene 4 ND/<5.0Xylenes 10,000 ND/<2.0

MW-114

Lake Sample

MW-113





Data Point Compound *GQES 01/14/03 10/25/04 08/02/05Benzene 5 ND/<1.0n-Butylbenzenesec-ButylbenzeneChlorobenzene 100 ND/<1.01,2-Dibromoethane1,2-Dichloroethane 5cis-1,2-Dichloroethene (DCE) 70 ND/<1.0Ethylbenzene 700 ND/<1.0Isopropylbenzene ND/<5.0p-Isopropyltoluene ND/<5.0Methyl-t-butylether (MtBE) 40 ND/<1.0Naphthalene 20 ND/<5.0n-Propylbenzene ND/<5.0Tetrachloroethene (PCE) 5 ND/<1.0Toluene 1000 1.5Trichloroethene (TCE) 5 ND/<1.01,2,4-Trimethylbenzene 5 ND/<5.01,3,5-Trimethylbenzene 4 ND/<5.0Xylenes 10,000 2.3Benzene 5 ND/<1.0n-Butylbenzenesec-ButylbenzeneChlorobenzene 100 ND/<1.01,2-Dibromoethane1,2-Dichloroethane 5cis-1,2-Dichloroethene (DCE) 70 ND/<1.0Ethylbenzene 700 1.5Isopropylbenzene 6.3p-Isopropyltoluene ND/<5.0Methyl-t-butylether (MtBE) 40 1.4Naphthalene 20 6.1n-Propylbenzene 6.7Tetrachloroethene (PCE) 5 22Toluene 1000 ND/<1.0Trichloroethene (TCE) 5 ND/<1.01,2,4-Trimethylbenzene 5 231,3,5-Trimethylbenzene 4 15Xylenes 10,000 6.0Benzene 5 ND/<1.0n-Butylbenzenesec-ButylbenzeneChlorobenzene 100 ND/<1.01,2-Dibromoethane1,2-Dichloroethane 5cis-1,2-Dichloroethene (DCE) 70 ND/<1.0Ethylbenzene 700 ND/<1.0Isopropylbenzene ND/<5.0p-Isopropyltoluene ND/<5.0Methyl-t-butylether (MtBE) 40 ND/<1.0Naphthalene 20 ND/<5.0n-Propylbenzene ND/<5.0Tetrachloroethene (PCE) 5 ND/<1.0Toluene 1000 ND/<1.0Trichloroethene (TCE) 5 ND/<1.01,2,4-Trimethylbenzene 5 ND/<5.01,3,5-Trimethylbenzene 4 ND/<5.0Xylenes 10,000 ND/<2.0Trip Blank

151 South Champlain

Catch Basin

Duplicate (MW-111)





Data Point Compound *GQES 01/14/03 10/25/04 08/02/05Benzene 5 ND/<1.0n-Butylbenzenesec-ButylbenzeneChlorobenzene 100 ND/<1.01,2-Dibromoethane1,2-Dichloroethane 5cis-1,2-Dichloroethene (DCE) 70 ND/<1.0Ethylbenzene 700 ND/<1.0Isopropylbenzene ND/<5.0p-Isopropyltoluene ND/<5.0Methyl-t-butylether (MtBE) 40 ND/<1.0Naphthalene 20 ND/<5.0n-Propylbenzene ND/<5.0Tetrachloroethene (PCE) 5 ND/<1.0Toluene 1000 ND/<1.0Trichloroethene (TCE) 5 ND/<1.01,2,4-Trimethylbenzene 5 ND/<5.01,3,5-Trimethylbenzene 4 ND/<5.0Xylenes 10,000 ND/<2.0

Equipment Blank



Indoor Air Quality DataEPA Method TO2


Sheet 1 of 10

2/23/2006Compound EPA RBC* VDOH** Concentration Concentration Concentration

(ug/m3) (ug/m3) (ug/m3) (ug/m3) (ug/m3)Benzene 0.23 0.49 0.76 ND/<.25 ND/<.20Toluene 420 8.75 2.39 1.25 3.02

Ethylbenzene 1,100 1.00 ND/<.35 ND/<.25 0.267Xylenes, Total 110 4.54 1.19 0.51 1.68

1,2,4-Trimethylbenzene 6.2 0.78 ND/<.26 ND/<.201,3,5-Trimethylbenzene 6.2 ND/<.35 ND/<.26 ND/<.20

Naphthalene 3.3 0.39 ND/<.25 ND/<.20Carbon Tetrachloride 0.12 0.41 ND/<.35 ND/<.26 ND/<.20Methylene Chloride 3.8 0.54 ND/<.35 ND/<.96 10.52Tetrachloroethene 0.31 0.57 1.79 0.98 0.34Trichloroethene 0.016 0.41 ND/<.35 ND/<.26 ND/<.20

1,2 Dichloroethane 0.069 ND/<.35 ND/<.25 ND/<.201,1 Dichloroethene 220 ND/<.35 ND/<.26 ND/<.20

1,1,1-Trichloroethane 2,300 ND/<.35 ND/<.26 ND/<.20Benzene 0.23 0.49 0.50 ND/<.30 0.43Toluene 420 8.75 1.6 5.77 3.94

Ethylbenzene 1,100 1.00 ND/<.36 0.62 0.34Xylenes, Total 110 4.54 1.16 3.10 1.91

1,2,4-Trimethylbenzene 6.2 0.59 0.44 0.321,3,5-Trimethylbenzene 6.2 ND/<.36 ND/<.30 ND/<.21

Naphthalene 3.3 ND/<.36 0.33 ND/<.21Carbon Tetrachloride 0.12 0.41 ND/<.36 ND/<.30 ND/<.21Methylene Chloride 3.8 0.54 ND/<.36 ND/<.96 3.33Tetrachloroethene 0.31 0.57 1.32 1.14 3.02Trichloroethene 0.016 0.41 ND/<.36 ND/<.30 ND/<.21


1,1,1-Trichloroethane 2,300 ND/<.36 ND/<.30 ND/<.21Benzene 0.23 0.49 0.58Toluene 420 8.75 4.48

Ethylbenzene 1,100 1.00 0.34Xylenes, Total 110 4.54 2.04

1,2,4-Trimethylbenzene 6.2 0.331,3,5-Trimethylbenzene 6.2 ND/<.19

Naphthalene 3.3 ND/<.19Carbon Tetrachloride 0.12 0.41 0.24Methylene Chloride 3.8 0.54 4.67Tetrachloroethene 0.31 0.57 1.50Trichloroethene 0.016 0.41 ND/<.19

1,2 Dichloroethane 0.069 ND/<.191,1 Dichloroethene 220 ND/<.19

1,1,1-Trichloroethane 2,300 ND/<.19

6/10/2005

151 S.CHAMPLAINBASEMENT

151 S.CHAMPLAIN BASEMENT DUPLICATE

151 S.CHAMPLAIN 1ST FLOOR

8/24/2005

*Region III Risk Based Concentration Table **Indoor Ambient Air Survey - 1989ND< - None Detected Shaded - Value Over Either EPA or VDOH Bolded - Value Over Both EPA and VDOHItalics - Estimated Value




Sheet 2 of 10


(ug/m3) (ug/m3) (ug/m3) (ug/m3) (ug/m3)

6/10/2005 8/24/2005

Benzene 0.23 0.49 0.49 1.27 2.41Toluene 420 8.75 12.7 13.94 12.22

Ethylbenzene 1,100 1.00 2.25 3.56 2.43Xylenes, Total 110 4.54 25.6 14.38 9.46

1,2,4-Trimethylbenzene 6.2 20.1 4.25 2.891,3,5-Trimethylbenzene 6.2 6.71 1.17 0.78

Naphthalene 3.3 7.49 1.96 0.51Carbon Tetrachloride 0.12 0.41 ND/<.39 ND/<.38 ND/<.27Methylene Chloride 3.8 0.54 ND/<.39 ND/<.96 ND/<1.37Tetrachloroethene 0.31 0.57 ND/<.39 ND/<.38 0.57Trichloroethene 0.016 0.41 ND/<.39 ND/<.38 ND/<.27


1,1,1-Trichloroethane 2,300 ND/<.39 ND/<.38 ND/<.27Benzene 0.23 0.49 0.33 1.03Toluene 420 8.75 14.32 2.16

Ethylbenzene 1,100 1.00 2.81 ND/<0.23Xylenes, Total 110 4.54 14.9 0.45

1,2,4-Trimethylbenzene 6.2 1.71 ND/<0.231,3,5-Trimethylbenzene 6.2 0.53 ND/<0.23

Naphthalene 3.3 1.02 ND/<0.23Carbon Tetrachloride 0.12 0.41 ND/<.32 0.26Methylene Chloride 3.8 0.54 ND/<.96 ND/<1.13Tetrachloroethene 0.31 0.57 ND/<.32 0.27Trichloroethene 0.016 0.41 ND/<.32 0.42

1,2 Dichloroethane 0.069 ND/<.32 ND/<.231,1 Dichloroethene 220 ND/<.32 ND/<.23

1,1,1-Trichloroethane 2,300 ND/<.32 ND/<.23Benzene 0.23 0.49 0.34Toluene 420 8.75 4.48


1,2,4-Trimethylbenzene 6.2 0.421,3,5-Trimethylbenzene 6.2 0.19

Naphthalene 3.3 0.16Carbon Tetrachloride 0.12 0.41 ND/<.16Methylene Chloride 3.8 0.54 1.36Tetrachloroethene 0.31 0.57 0.38Trichloroethene 0.016 0.41 ND/<.16



40 KING

197 BATTERY1ST FLOOR

197 BATTERY BASEMENT





Sheet 3 of 10



6/10/2005 8/24/2005

Benzene 0.23 0.49 0.53 1.18Toluene 420 8.75 2.01 1.29

Ethylbenzene 1,100 1.00 0.37 ND/<0.18Xylenes, Total 110 4.54 1.87 ND/<0.37

1,2,4-Trimethylbenzene 6.2 0.46 ND/<.181,3,5-Trimethylbenzene 6.2 ND/<.36 ND/<.18

Naphthalene 3.3 ND/<.36 ND/<.18Carbon Tetrachloride 0.12 0.41 ND/<.37 0.24Methylene Chloride 3.8 0.54 ND/<.96 ND/<.92Tetrachloroethene 0.31 0.57 ND/<.37 ND/<.18Trichloroethene 0.016 0.41 ND/<.37 ND/<.18


1,1,1-Trichloroethane 2,300 ND/<.37 ND/<.18Benzene 0.23 0.49 0.75 0.27 0.58Toluene 420 8.75 4.31 2.47 0.73

Ethylbenzene 1,100 1.00 ND/<.31 6.86 ND/<.23Xylenes, Total 110 4.54 0.86 37.96 ND/<.45

1,2,4-Trimethylbenzene 6.2 3.28 1.78 ND/<.231,3,5-Trimethylbenzene 6.2 1.04 0.59 ND/<.23

Naphthalene 3.3 0.82 0.37 ND/<.23Carbon Tetrachloride 0.12 0.41 ND/<.31 ND/<.27 0.29Methylene Chloride 3.8 0.54 ND/<.31 ND/<.96 ND/<1.14Tetrachloroethene 0.31 0.57 0.44 0.27 ND/<.23Trichloroethene 0.016 0.41 ND/<.31 ND/<.27 ND/<.23





Naphthalene 3.3 0.24Carbon Tetrachloride 0.12 0.41 ND/<.22Methylene Chloride 3.8 0.54 7.48Tetrachloroethene 0.31 0.57 0.65Trichloroethene 0.016 0.41 ND/<.22



180 BATTERY

174 BATTERYBASEMENT






Sheet 4 of 10



6/10/2005 8/24/2005

Benzene 0.23 0.49 0.46 ND/<.36 0.24Toluene 420 8.75 4.8 2.11 0.24

Ethylbenzene 1,100 1.00 1.34 ND/<.36 ND/<.21Xylenes, Total 110 4.54 4.8 1.36 ND/<.21

1,2,4-Trimethylbenzene 6.2 1.6 0.44 ND/<.211,3,5-Trimethylbenzene 6.2 0.47 ND/<.36 ND/<.21

Naphthalene 3.3 1.42 ND/<.36 ND/<.21Carbon Tetrachloride 0.12 0.41 ND/<.40 ND/<.36 0.22Methylene Chloride 3.8 0.54 ND/<.40 ND/<.96 ND/<1.03Tetrachloroethene 0.31 0.57 ND/<.40 ND/<.36 ND/<.21Trichloroethene 0.016 0.41 ND/<.40 ND/<.36 ND/<.21





Naphthalene 3.3 ND/<.23Carbon Tetrachloride 0.12 0.41 ND/<.23Methylene Chloride 3.8 0.54 3.14Tetrachloroethene 0.31 0.57 0.33Trichloroethene 0.016 0.41 ND/<.23


1,1,1-Trichloroethane 2,300 ND/<.23Benzene 0.23 0.49 0.72 0.35 ND/<.24Toluene 420 8.75 2.61 1.91 0.24

Ethylbenzene 1,100 1.00 1.79 4.19 ND/<.24Xylenes, Total 110 4.54 8.87 17.94 ND/<.24

1,2,4-Trimethylbenzene 6.2 1.56 1.71 ND/<.241,3,5-Trimethylbenzene 6.2 0.54 0.58 ND/<.24

Naphthalene 3.3 0.57 ND/<.33 ND/<.24Carbon Tetrachloride 0.12 0.41 ND/<.28 ND/<.33 0.34Methylene Chloride 3.8 0.54 ND/<1.42 ND/<1.64 8.72Tetrachloroethene 0.31 0.57 1.03 ND/<.33 ND/<.24Trichloroethene 0.016 0.41 ND/<.28 ND/<.33 ND/<.24


1,1,1-Trichloroethane 2,300 ND/<.28 ND/<.33 ND/<.24

168 BATTERYBASEMENT


164 BATTERYBASEMENT





Sheet 5 of 10



6/10/2005 8/24/2005

Benzene 0.23 0.49 ND/<.26Toluene 420 8.75 0.26

Ethylbenzene 1,100 1.00 ND/<.26Xylenes, Total 110 4.54 ND/<.26

1,2,4-Trimethylbenzene 6.2 ND/<.261,3,5-Trimethylbenzene 6.2 ND/<.26

Naphthalene 3.3 ND/<.26Carbon Tetrachloride 0.12 0.41 0.29Methylene Chloride 3.8 0.54 2.40Tetrachloroethene 0.31 0.57 ND/<.26Trichloroethene 0.016 0.41 ND/<.26


1,1,1-Trichloroethane 2,300 ND/<.26Benzene 0.23 0.49 ND/<.45 ND/<.32 ND/<.38Toluene 420 8.75 0.45 0.97 4.75

Ethylbenzene 1,100 1.00 ND/<.45 ND/<.32 0.47Xylenes, Total 110 4.54 ND/<.45 0.64 2.17

1,2,4-Trimethylbenzene 6.2 ND/<.45 ND/<.32 ND/<.381,3,5-Trimethylbenzene 6.2 ND/<.45 ND/<.32 ND/<.38

Naphthalene 3.3 ND/<.45 ND/<.33 ND/<.38Carbon Tetrachloride 0.12 0.41 ND/<.45 ND/<.33 ND/<.38Methylene Chloride 3.8 0.54 ND/<.45 ND/<.96 4.15Tetrachloroethene 0.31 0.57 1.23 0.75 0.94Trichloroethene 0.016 0.41 1.65 ND/<.33 ND/<.38





Naphthalene 3.3 0.35Carbon Tetrachloride 0.12 0.41 ND/<.21Methylene Chloride 3.8 0.54 6.59Tetrachloroethene 0.31 0.57 0.87Trichloroethene 0.016 0.41 0.95



162 BATTERYBASEMENT







Sheet 6 of 10



6/10/2005 8/24/2005

Benzene 0.23 0.49 1.04 0.84 0.56Toluene 420 8.75 33.99 12.74 0.51

Ethylbenzene 1,100 1.00 5.67 1.54 ND/<.26Xylenes, Total 110 4.54 24.50 6.39 ND/<.53


Naphthalene 3.3 0.84 ND/<.51 ND/<.26Carbon Tetrachloride 0.12 0.41 ND/<.31 ND/<.52 0.30Methylene Chloride 3.8 0.54 ND/<1.53 ND/<2.56 ND/<1.32Tetrachloroethene 0.31 0.57 4.65 0.96 ND/<.26Trichloroethene 0.016 0.41 ND/<.31 ND/<.52 ND/<.26


1,1,1-Trichloroethane 2,300 0.74 2.14 0.44Benzene 0.23 0.49 0.39Toluene 420 8.75 4.41


1,2,4-Trimethylbenzene 6.2 0.531,3,5-Trimethylbenzene 6.2 ND/<.23

Naphthalene 3.3 ND/<.23Carbon Tetrachloride 0.12 0.41 ND/<.23Methylene Chloride 3.8 0.54 1.93Tetrachloroethene 0.31 0.57 0.25Trichloroethene 0.016 0.41 ND/<.23


1,1,1-Trichloroethane 2,300 ND/<.23Benzene 0.23 0.49 1.50 0.56 ND/<.16Toluene 420 8.75 2.25 1.51 ND/<.16

Ethylbenzene 1,100 1.00 ND/<.31 0.28 ND/<.16Xylenes, Total 110 4.54 3.28 1.38 ND/<.16


Naphthalene 3.3 0.94 ND/<.26 ND/<.16Carbon Tetrachloride 0.12 0.41 ND/<.31 ND/<.26 0.16Methylene Chloride 3.8 0.54 ND/<.31 ND/<.96 ND/<.16Tetrachloroethene 0.31 0.57 ND/<.31 ND/<.26 ND/<.16Trichloroethene 0.016 0.41 ND/<.31 ND/<.27 ND/<.16


1,1,1-Trichloroethane 2,300 ND/<.31 ND/<.27 ND/<.16

156 BATTERYBASEMENT


152 BATTERYBASEMENT





Sheet 7 of 10



6/10/2005 8/24/2005

Benzene 0.23 0.49 ND/<.16Toluene 420 8.75 ND/<.16



Naphthalene 3.3 ND/<.16Carbon Tetrachloride 0.12 0.41 ND/<.16Methylene Chloride 3.8 0.54 ND/<.16Tetrachloroethene 0.31 0.57 ND/<.16Trichloroethene 0.016 0.41 ND/<.16


1,1,1-Trichloroethane 2,300 ND/<.16Benzene 0.23 0.49 ND/<.56 0.55Toluene 420 8.75 2.49 0.81

Ethylbenzene 1,100 1.00 ND/<.56 ND/<.33Xylenes, Total 110 4.54 1.43 ND/<.65

1,2,4-Trimethylbenzene 6.2 ND/<.56 ND/<.331,3,5-Trimethylbenzene 6.2 ND/<.56 ND/<.33

Naphthalene 3.3 ND/<.56 ND/<.33Carbon Tetrachloride 0.12 0.41 ND/<.56 ND/<.33Methylene Chloride 3.8 0.54 ND/<.96 ND/<1.63Tetrachloroethene 0.31 0.57 ND/<.56 ND/<.33Trichloroethene 0.016 0.41 ND/<.56 ND/<.33


1,1,1-Trichloroethane 2,300 ND/<.56 ND/<.33Benzene 0.23 0.49 0.55 0.47 0.83Toluene 420 8.75 1.70 2.16 4.54

Ethylbenzene 1,100 1.00 ND/<.33 0.34 0.48Xylenes, Total 110 4.54 2.28 1.39 4.54

1,2,4-Trimethylbenzene 6.2 1.06 0.50 0.581,3,5-Trimethylbenzene 6.2 0.34 ND/<.31 0.27

Naphthalene 3.3 0.45 ND/<.31 0.21Carbon Tetrachloride 0.12 0.41 ND/<.33 ND/<.31 ND/<.19Methylene Chloride 3.8 0.54 ND/<.33 ND/<.96 4.01Tetrachloroethene 0.31 0.57 ND/<.33 ND/<.31 0.49Trichloroethene 0.016 0.41 ND/<.33 ND/<.31 ND/<.19


1,1,1-Trichloroethane 2,300 0.39 ND/<.31 ND/<.19

1 MAIN

27 MAINBASEMENT






Sheet 8 of 10



6/10/2005 8/24/2005

Benzene 0.23 0.49Toluene 420 8.75

Ethylbenzene 1,100 1.00Xylenes, Total 110 4.54

1,2,4-Trimethylbenzene 6.21,3,5-Trimethylbenzene 6.2

Naphthalene 3.3Carbon Tetrachloride 0.12 0.41Methylene Chloride 3.8 0.54Tetrachloroethene 0.31 0.57Trichloroethene 0.016 0.41

1,2 Dichloroethane 0.0691,1 Dichloroethene 220

1,1,1-Trichloroethane 2,300Benzene 0.23 0.49 0.54 ND/<.28Toluene 420 8.75 1.2 ND/<.28

Ethylbenzene 1,100 1.00 0.56 ND/<.28Xylenes, Total 110 4.54 3.4 ND/<.56

1,2,4-Trimethylbenzene 6.2 1.0 ND/<.281,3,5-Trimethylbenzene 6.2 ND/<.35 ND/<.28

Naphthalene 3.3 0.46 0.28Carbon Tetrachloride 0.12 0.41 0.38 ND/<.28Methylene Chloride 3.8 0.54 ND/<.35 ND/<1.40Tetrachloroethene 0.31 0.57 ND/<.35 ND/<.28Trichloroethene 0.016 0.41 ND/<.35 ND/<.28


1,1,1-Trichloroethane 2,300 ND/<.35 ND/<.28Benzene 0.23 0.49 ND/<.28Toluene 420 8.75 ND/<.28



Naphthalene 3.3 ND/<.28Carbon Tetrachloride 0.12 0.41 ND/<.28Methylene Chloride 3.8 0.54 ND/<1.40Tetrachloroethene 0.31 0.57 ND/<.28Trichloroethene 0.016 0.41 ND/<.28



27 MAIN1ST FLOOR

31-35 MAIN1ST FLOOR

31-35 MAINBASEMENT





Sheet 9 of 10



6/10/2005 8/24/2005

Benzene 0.23 0.49 0.71 ND/<.36 ND/<.49Toluene 420 8.75 1.52 0.98 ND/<.49

Ethylbenzene 1,100 1.00 ND/<.29 ND/<.36 ND/<.49Xylenes, Total 110 4.54 2.42 ND/<.73 ND/<.98

1,2,4-Trimethylbenzene 6.2 0.67 ND/<.36 ND/<.491,3,5-Trimethylbenzene 6.2 ND/<.29 ND/<.36 ND/<.49

Naphthalene 3.3 0.50 ND/<.36 ND/<.49Carbon Tetrachloride 0.12 0.41 ND/<.29 ND/<.37 ND/<.49Methylene Chloride 3.8 0.54 ND/<.29 ND/<.96 ND/<2.44Tetrachloroethene 0.31 0.57 ND/<.29 ND/<.37 ND/<.49Trichloroethene 0.016 0.41 ND/<.29 ND/<.37 ND/<.49


1,1,1-Trichloroethane 2,300 ND/<.29 ND/<.37 ND/<.49Benzene 0.23 0.49 ND/<.23Toluene 420 8.75 ND/<.23



Naphthalene 3.3 ND/<.23Carbon Tetrachloride 0.12 0.41 0.23Methylene Chloride 3.8 0.54 ND/<1.14Tetrachloroethene 0.31 0.57 ND/<.23Trichloroethene 0.016 0.41 ND/<.23


1,1,1-Trichloroethane 2,300 ND/<.23Benzene 0.23 0.49 1.93 0.34Toluene 420 8.75 3.47 1.84

Ethylbenzene 1,100 1.00 2.22 ND/<.32Xylenes, Total 110 4.54 11.01 1.58

1,2,4-Trimethylbenzene 6.2 2.98 0.361,3,5-Trimethylbenzene 6.2 1.12 ND/<.32

Naphthalene 3.3 0.65 ND/<.32Carbon Tetrachloride 0.12 0.41 ND/<.31 ND/<.32Methylene Chloride 3.8 0.54 ND/<.31 ND/<.96Tetrachloroethene 0.31 0.57 ND/<.31 ND/<.32Trichloroethene 0.016 0.41 ND/<.31 ND/<.32


1,1,1-Trichloroethane 2,300 ND/<.31 ND/<.32OUTSIDE

41-47 MAIN1ST FLOOR

41-47 MAINBASEMENT





Sheet 10 of 10



6/10/2005 8/24/2005

Benzene 0.23 0.49 0.35 1.01Toluene 420 8.75 15.79 5.44

Ethylbenzene 1,100 1.00 1.67 0.65Xylenes, Total 110 4.54 8.38 3.47

1,2,4-Trimethylbenzene 6.2 1.18 0.641,3,5-Trimethylbenzene 6.2 0.45 ND/<.21

Naphthalene 3.3 0.34 ND/<.21Carbon Tetrachloride 0.12 0.41 ND/<.31 ND/<.21Methylene Chloride 3.8 0.54 ND/<.96 ND/<1.05Tetrachloroethene 0.31 0.57 ND/<.31 0.67Trichloroethene 0.016 0.41 0.42 ND/<.21


1,1,1-Trichloroethane 2,300 ND/<.31 ND/<.21STORM SEWER


IVS

N F O R M A T I O N &I S U A L I Z A T I O NE R V I C E S

Heindel and NoyesHydrogeology Ecology# # #

Environmental Engineering# #

CONSULTING SCIENTISTS AND ENGINEERS

N

EW

S7/25/07M. Lumanz:\mluman\projects\151 south champlain\sitemap.apr

Site Location

151 South Champlain StreetBurlington, Vermont

USGS Site Location Map2000 0 2000 4000 Feet

Heindel and Noyes


Hydrogeology Ecology

Environmental EngineeringDRAWN BY:

DATE:

PROJECT NO.

FILE:SCALE:

APPROVED:

Prepared By:Information & Visualization Services

PROJ. MGR:

DRAFT FINAL

151 South Champlain StreetBURLINGTON, VERMONT

z:\mluman\151southchamplain

JULY 25, 2007

03336

NOT TO SCALE

Active Sub Slab Depressurization System Schematic

Figure 3

Corrective Action Plan Implementation Schedule

1 2 3 4 5 6 7 8 9 10 11 12Public Notice Period

Negotiation with Affected Property Owners and Acquire Permits

Sub Slab Depressurization System Installations

Extraction and Monitoring Point InstallationsPlumbing and CarpentryFan and Electric InstallationsStart Up/DebuggingAs-Built Report Generation

# of Weeks after CAP AcceptanceProject Task

APPENDIX 1

APPENDIX 1

Designation: E 2121 – 03

Standard Practice forInstalling Radon Mitigation Systems in Existing Low-RiseResidential Buildings 1

This standard is issued under the fixed designation E 2121; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This practice describes methods for reducing radonentry into existing attached and detached residential buildingsthree stories or less in height. This practice is intended for useby trained, certified or licenced, or both, or otherwise qualifiedindividuals.

1.2 These methods are based on radon mitigation techniquesthat have been effective in reducing radon levels in a widerange of residential buildings and soil conditions. These fanpowered mitigation methods are listed in Appendix X1. Moredetailed information is contained in references cited throughoutthis practice.

1.3 This practice is intended to provide radon mitigationcontractors with a uniform set of practices that will ensure ahigh degree of safety and the likelihood of success in retrofit-ting low rise residential buildings with radon mitigationsystems.

1.4 The methods described in this practice apply to cur-rently occupied or formerly occupied residential buildings,including buildings converted or being converted to residentialuse, as well as, residential buildings changed or being changedby addition(s), or alteration(s), or both. The radon reductionactivities performed on new dwellings, while under construc-tion, before occupancy, and for up to one year after occupancy,are covered by Guide E 1465.

1.5 This practice also is intended as a model set of practices,which can be adopted or modified by state and local jurisdic-tions, to fulfill objectives of their specific radon contractorcertification or licensure programs. Radon mitigation per-formed in accordance with this practice is considered ordinaryrepair.

1.6 The methods addressed in this practice include thefollowing categories of contractor activity: general practices,building investigation, systems design, systems installation,materials, monitors and labeling, post-mitigation testing, anddocumentation.

1.7 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.See Section 6 forspecific safety hazards.

2. Referenced Documents

2.1 ASTM Standards:E 631 Terminology of Building Constructions2

E 779 Test Method for Determining Air Leakage Rate byFan Pressurization2

E 1465 Guide for Radon Control Options for the Designand Construction of New Low-Rise Residential Buildings2

E 1745 Specification for Plastic Water Vapor RetardersUsed in Contact With Soil or Granular Fill Under ConcreteSlabs3

E 1998 Guide for Assessing Depressurization-InducedBackdrafting and Spillage from Vented Combustion Appli-ances3

2.2 Government Publications:EPA “A Citizen’s Guide to Radon (Second Edition),” EPA

402-K92-001, May 19924

EPA “Consumer’s Guide to Radon Reduction,” EPA 402-K92-003, August, 19924

EPA “Home Buyers and Sellers Guide,” EPA 402–K-00–008, July 20004

EPA “Handbook, Sub-Slab Depressurization for Low-Permeability Fill Material,” EPA/625/6-91/029, July19914

EPA “Radon Reduction Techniques for Existing DetachedHouses, Technical Guidance (Second Edition),” EPA/625/5–87/019, Revised January, 19884

EPA “Radon Reduction Techniques for Existing DetachedHouses, Technical Guidance (Third Edition) for ActiveSoil Depressurization Systems,” EPA/625/R-93-011, Oc-tober, 19934

1 This practice is under the jurisdiction of ASTM Committee E06 on Perfor-mance of Buildings and is the direct responsibility of Subcommittee E06.41 on AirLeakage and Ventilation Performance.

Current edition approved Feb. 10, 2003. Published February 2003. Originallyapproved in 2001. Last previous edition approved in 2002 as E 2121–02a.

2 Annual Book of ASTM Standards, Vol 04.11.3 Annual Book of ASTM Standards, Vol 04.12.4 Available from the U.S. Environmental Protection Agency, 1200 Pennsylvania

Avenue, NW, Washington, DC 20460.

1

Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.

Copyright by ASTM Int'l (all rights reserved); Mon Jul 10 16:11:55 EDT 2006Reproduction authorized per License Agreement with STEVEN LAROSA (LINCOLN APPLIED GEOLOGY, INC.);

EPA “Radon Mitigation Standards,” EPA 402-R-93-078,April, 19942

EPA “National Emission Standard for Asbestos,” 40 CFR61, Subpart M

EPA “Asbestos School Hazard Abatement ReauthorizationAct” regulation 40 CFR Part 763, Subpart E4

OSHA “Respiratory Protection Standard,” 29 CFR1920.134 (1998)5

OSHA “Safety and Health Regulations for Construction,Ionizing Radiation,” 29 CFR 1926.535

OSHA “Hazard Communication Standard for the Construc-tion Industry,” 29 CFR 1926.595

OSHA “Asbestos Standard for the Construction Indus-try” 29 CFR 1926.11025

OSHA “Occupational Safety and Health Regulations, Ioniz-ing Radiation,” 29 CFR 1910.965

NIOSH “Guide to Industrial Respiratory Protection,”NIOSH Publication No. 87–1166

NCRP “Measurement of Radon and Radon Daughters inAir,” NCRP Report No. 97, 19887

2.3 ANSI/ASHRAE Standards:ANSI/ASHRAE Standard 62–1989, Ventillation for Accept-

able Indoor Air Quality8

ANSI/ASHRAE Standard 62–1989, Ventillation for Accept-able Indoor Air Quality, Appendix B, Positive CombustionAir Supply8

3. Terminology

3.1 Definitions—Definitions of terms used in this practiceare defined in accordance with Terminology E 631.

3.2 Definitions of Terms Specific to This Standard:3.2.1 active soil depressurization (ASD), n—a family of

radon mitigation systems involving mechanically-driven soildepressurization, including sub-slab depressurization (SSD),sump pit depressurization (SPD), drain tile depressurization(DTD), hollow block wall depressurization (BWD), and sub-membrane depressurization (SMD) (see Appendix X2).

3.2.2 backdrafting, n—a condition where the normal move-ment of combustion products up a flue (due to the buoyancy ofthe hot flue gases), is reversed, so that the combustion productsenter the building (seepressure-induced spillage).

3.2.3 communication test, n—a diagnostic test to evaluatethe potential effectiveness of a sub-slab depressurization sys-tem by applying a vacuum beneath the slab and measuring,either with a micromanometer or with a heatless smoke device,the extension of the vacuum field. Also calledpressure-fieldextension test.

3.2.4 contractor, n—for the purposes of this practice, acontractor is one who contracts to performs radon reduction

activities or is an employee of one who contracts to perform orperforms radon reduction activities, with the expectation thatpayment will be received for the work performed. A personwho does radon reduction activities as an employee of abuilding owner is also a contractor for purposes of this standardpractice. Persons whose normal activity is not radon reduction,but who do work related to radon reduction like indoor airquality consultants, radon consultants, plumbers, building con-tractors, or employees of these persons are all viewed ascontractors when performing radon reduction activities cov-ered by this practice.

3.2.5 crawlspace depressurization (CSD) (active), n—a ra-don mitigation technique designed to achieve lower air pres-sure in the crawlspace than in the rooms bordering and abovethe crawlspace. A radon fan, draws air from the crawl spaceand exhausts that air outside the building. Crawlspace depres-surization is intended to mitigate rooms bordering and abovethe crawlspace but not the crawlspace itself. All CSD systems,for purposes of this practice, are active.

3.2.6 depressurization, n—a negative pressure induced inone area relative to another.

3.2.7 diagnostic tests, n—procedures used to identify orcharacterize conditions under, beside and within buildings thatmay contribute to radon entry or elevated radon levels or thatmay provide information regarding the performance of amitigation system.

3.2.8 drain tile depressurization (DTD) (active), n—a typeof active soil depressurization radon mitigation system wherethe suction point piping attaches to a drain tile or is located ingas-permeable material near the drain tile. The drain tile orperimeter drain may be inside or outside the footings of thebuilding.

3.2.9 hollow wall depressurization (BWD) (active), n—aradon mitigation technique that depressurizes the void spacewithin a foundation wall (usually a block wall). A radon faninstalled in the radon system piping draws air from within thewall.

3.2.10 manifold piping, n—this piping collects the flow ofsoil-gas from two or more suction points and delivers thatcollected soil-gas to the vent stack piping. In the case of asingle suction point system, there is no manifold piping sincethe suction point piping connects directly to the vent stackpiping. The manifold piping starts where it connects to thesuction point piping and ends where it connects to the ventstack piping.

3.2.11 mechanically-ventilated crawlspace system, n—aradon-control technique designed to increase ventilation withina crawlspace by use of a fan.

3.2.12 mitigation system, n—any system or steps designedto reduce radon concentrations in the indoor air of a building.

3.2.13 natural draft combustion appliance, n—any fuelburning appliance that relies on natural convective flow toexhaust combustion products through flues to outside air.

3.2.14 occupiable spaces, n—for purposes of this practice,are areas of buildings where human beings spend or couldspend time, on a regular or occasional basis.

3.2.14.1Discussion—Examples of occupiable spaces arethose that are or could be used for sleeping, a work shop, a

5 Available from the U. S. Department of Labor, Occupational Safety and HealthAdministration, Office of Public Affairs, Room N3647, 200 Constitution Avenue,Washington, DC 20210.

6 Available from the National Institute for Occupational Safety and Health, 200Independence Avenue, SW, Room 715H, Washington, DC 20201.

7 Available from the National Commission on Radiation Protection and Mea-surement, 7910 Woodmont Avenue, Suite 800, Bethesda, MD 20814.

8 Available from the American Society of Heating, Refrigerating, and AirConditioning Engineers, 1791 Tullie Circle, N.E., Atlanta, GA 30329.

E 2121 – 03

2Copyright by ASTM Int'l (all rights reserved); Mon Jul 10 16:11:55 EDT 2006Reproduction authorized per License Agreement with STEVEN LAROSA (LINCOLN APPLIED GEOLOGY, INC.);

hobby, reading, student home work, a home office, entertain-ment (TV, music, computer, etc.), physical work-out, laundry,games, or child’s play.

3.2.15 pressure-field extension, n—the distance that a pres-sure change, created by drawing soil-gas through a suctionpoint extends outward in a sub-slab gas permeable layer, undera membrane, behind a solid wall, or in a hollow wall (seecommunication test).

3.2.16 pressure-induced spillage, n—the unintended flow ofcombustion gases from an appliance/venting system into adwelling, primarily as a result of building depressurization (seebackdrafting).

3.2.17 radon system piping, n—this active or passive soildepressurization piping is composed of three parts: suctionpoint piping, manifold piping, and vent stack piping.

3.2.18 re-entrainment, n—the unintended re-entry of radoninto a building from leaks in the radon system piping, fromleaks in the fan housing, or from the discharge of the vent stackpiping.

3.2.19 soil-gas, n—the gas mixture present in soil, whichmay contain radon.

3.2.20 soil-gas-retarder, n—a continuous membrane orother comparable material used to retard the flow of soil gasesinto a building. See Specification E 1745 for permeance anddurability of water vapor retarders that may be used assoil-gas-retarders.

3.2.21 submembrane depressurization (SMD) (active), n—aradon mitigation technique designed to achieve lower airpressure under a soil-gas-retarder membrane than above it. Forexample, a soil-gas-retarder membrane could be used to coverthe soil found on a crawlspace floor. A radon fan installed in theradon system piping draws air from below the soil-gas-retardermembrane.

3.2.22 sub-slab depressurization (SSD) (active), n—a radonmitigation technique designed to achieve lower air pressureunder a floor slab than above it. A radon fan installed in theradon system piping draws soil-gas from below the floor slab.

3.2.23 sub-slab depressurization (passive), n—a radon miti-gation technique designed to achieve lower air pressure undera floor slab than above it. The radon system piping is routedthrough the conditioned (heated and cooled) space of abuilding.

3.2.24 suction point piping, n—one end of this pipingpenetrates the slab, the solid wall, the hollow wall, themembrane, the sump cover, or the drain tile. The other endextends outward to the first accessible pipe connection beyondthe penetration of the soil-gas barrier.

3.2.25 sump pit depressurization (SPD) (active), n—a typeof active soil depressurization radon mitigation system wherethe suction point piping enters the sump pit, that has a sealedgasketed cover, through the side or through the cover.

3.2.26 vent stack piping, n—this piping collects the soil-gasfrom the suction point pipe of single suction point systems orfrom the manifold piping of multi-suction point systems. Thereare no branches in vent stack piping; soil-gas is collected at oneend of the vent stack piping and is discharged from the buildingat the other end. In active soil depressurization systems, theradon fan is installed in the vent stack piping.

3.2.27 ventilation, n—the process of introducing outdoor airinto a building.

3.2.28 working level (WL), n—a unit of radon decay productexposure. Numerically, any combination of short-lived radondecay products in one litre of air that will result in the ultimateemission of 130 000 MeV of potential alpha energy. Thisnumber was chosen because it is approximately the total alphaenergy released from the short lived decay products in equi-librium with 100 pCi of Rn-222.

3.2.29 working level month (WLM), n—a unit of exposureused to express the integrated human exposure to radon decayproducts. It is calculated by multiplying the average workinglevel to which a person has been exposed by the number ofhours exposed and dividing the product by 170.

4. Summary of Practice

4.1 This practice describes methods for mitigating elevatedlevels of radon in existing attached and detached residentialbuildings three stories or less in height.

4.2 The mitigation process is described in terms of thecategories of activity associated with radon mitigation andincludes: general practices, building investigation, systemsdesign, systems installation, materials, monitors and labeling,post-mitigation testing, and contracts and documentation.

4.3 The systems installation category contains subsectionsdescribing the specific requirements applicable to each of thecomponents of radon mitigation systems, for example, radonsystem piping, radon fans, sealing, electrical, etc.

5. Significance and Use

5.1 The purpose of the methods, systems, and designsdescribed in this practice is to reduce radiation exposures foroccupants of residential buildings caused by radon and itsprogeny. The goal of mitigation is to maintain reduced radonconcentrations in occupiable areas of buildings at levels as lowas reasonably achievable. This practice includes sections onreducing radiation exposure caused by radon and its progenyfor workers who install and repair radon mitigation systems.The goal for workers is to reduce exposures to radon and itsprogeny to levels as low as reasonably achievable.

5.2 The methods, systems, designs, and materials describedhere have been shown to have a high probability of success inmitigating radon in attached and detached residential buildings,three stories or less in height (see EPA, “Radon ReductionTechniques for Existing Detached Houses, Technical Guidance(Third Edition) for Active Soil Depressurization Systems”).Application of these methods does not, however, guaranteereduction of radon levels below any specific level, sinceperformance will vary with site conditions, construction char-acteristics, weather, and building operation.

5.3 When applying this practice, contractors also shallconform to all applicable local, state, and federal regulations,and laws pertaining to residential building construction, re-modeling, and improvement.

6. Safety Hazards

6.1 Contractors shall comply with all OSHA, state and localstandards or regulations relating to worker safety and occupa-tional radon exposure. Applicable references in the Code of

E 2121 – 03


Federal Regulations include those in 2.2. Contractors also shallfollow occupational radon guidance in 2.2.

6.2 In addition to OSHA standards and NIOSH recommen-dations, the following requirements specifically applicable tothe safety and protection of radon mitigation workers shall bemet:

6.2.1 The contractor shall advise workers of the hazards ofexposure to radon and the importance of protective measureswhen working in areas of elevated radon concentrations. Inaddition, the contractor shall advise employees of other poten-tial hazards according to the hazard communication standardfor the construction industry (see OSHA, “Hazard Communi-cation Standard for the Construction Industry”).

6.2.2 The contractor shall ensure that appropriate safetyequipment, such as ventilators, respirators, hard hats, faceshields, and ear plugs, are available on the job site duringmitigation activities.

6.2.3 Work areas shall be ventilated to reduce workerexposure to radon, dust, or other airborne pollutants.

6.2.4 Consistent with OSHA permissible exposure limits,contractors shall ensure that employees are exposed to no morethan four working level months (WLM) over a 12-monthperiod (or the equivalent 68 000 pCi/L-h, when converted at anequilibrium ratio of 100 %. A WLM is calculated by multiply-ing the average working level to which a person has beenexposed by the number of hours exposed and dividing theproduct by 170 h.

6.2.5 Contractors shall maintain records of employee expo-sure to radon sufficient to verify that field employees areexposed to less than 4 WLM in any 12-month period.

6.2.6 Where ventilation cannot reduce radon levels to lessthan 0.3 WL, contractors shall provide the respiratory protec-tion that is required to comply with 6.2.4. When unable tomake working level measurements, a radon concentration of 30pCi/1 (1 100 Bq/m3) shall be used in lieu of 0.3 WL. Thecontractor should provide respiratory protection that conformswith NIOSH “Guide to Industrial Respiratory Protection,” andthe OSHA “Respiratory Protection Standard,” which covers fittests for employees and other items related to respirators.

6.2.7 Radon mitigation work shall not be conducted in anywork area suspected of containing friable asbestos material, orwhere work would render non-friable asbestos material friable,until a determination has been made by a properly trained orcertified person that such work will be undertaken in a mannerwhich complies with applicable asbestos regulations, includingthose of EPA and OSHA (see 2.2).

6.2.8 Contractors shall advise employees of the potentialhazards, of the materials and supplies used, and provideapplicable material safety data sheets (MSDS).

7. Standard Practices for Radon Mitigation

7.1 General Practices:7.1.1 Radon mitigation systems shall be designed and in-

stalled to conform to applicable building codes, and maintainthe function and operation of all existing equipment andbuilding features, including doors, windows, access panels, etc.

7.1.2 Prior to starting work, the contractor shall inform theclient of the nature of work to be done, the anticipated use ofany potentially hazardous solvents or other materials, and the

need to ventilate work areas during and after the use of suchmaterials as recommended by the manufacturer of the material.

7.1.3 Prior to installing a radon mitigation system, a visualinspection of the building should be conducted to evaluatecharacteristics of the building which might affect radon miti-gation system performance.

7.1.4 If a contractor has concerns about backdrafting poten-tial at a particular site, the contractor shall recommend that aqualified person inspect the natural draft combustion appli-ances and venting systems for compliance with local codes andregulations. The contractor should recommend that the build-ing owner bring any combustion appliance or venting system,found to be noncomplying, into compliance.

7.2 Systems Design:7.2.1 All radon mitigation systems shall be designed and

installed as permanent, integral additions to the building.7.2.2 All radon mitigation systems shall be designed and

installed to avoid the creation of other health, safety, orenvironmental hazards to building occupants, such asbackdrafting/spillage, of natural draft combustion appliances,constricting or blocking building exits with pipe runs, ordegradation of fire rated assemblies with pipe, or cablingpenetrations, or both.

7.2.3 Radon mitigation system design is not limited tosafety, radon reduction effectiveness, and compliance withbuilding codes and regulations. Radon reduction system designalso is concerned with installation costs, operating costs,energy usage, durability, reliability, maintainability, physicalcomfort for occupants, quietness for occupants and neighbors,as well as impact on interior and exterior building appearance.

7.3 System Installation:7.3.1 General Requirements:7.3.1.1 All components of radon mitigation systems de-

signed and installed in compliance with provisions of thispractice also shall be in compliance with the applicablemechanical, electrical, building, plumbing, energy and fireprevention codes, standards, and regulations of the localjurisdiction.

7.3.1.2 When portions of structural framing members mustbe removed to accommodate radon system components, theamount of the member removed shall be no greater than thatpermitted for plumbing installations by applicable building orplumbing codes.

7.3.2 Radon System Piping Installation Requirements:7.3.2.1 Radon System Pipe Size—Also see Appendix X3.

All vent stack piping shall be solid, rigid pipe not less than3-in. (75-mm) inside diameter (ID). The vent stack piping’s IDshall be at least as large as the largest used in the manifoldpiping. All manifold piping shall be rigid pipe not less than3-in. (75-mm) inside diameter (ID). The manifold piping’s IDshall be at least as large as that used in any suction point.Manifold piping to which two or more suction points areconnected shall be at least 4 in. (100 mm) ID. When installingmanifold pipes to which three or more suction points need to beinstalled, the contractor may benefit from guidance in anindustrial ventilation manual. All suction point piping shall berigid pipe not less than 3-in. (75-mm) inside diameter. Notwithstanding the minimum radon system piping diameters

E 2121 – 03


specified herein, alternate pipe sizes may be used whensufficiently justified by field diagnostic measurements, includ-ing static pressure, air velocity, and rate of air flow measure-ments, and documented using the methodologies found in“Industrial Ventilation: A Manual of Standard Practice, 23rdEdition,”9 or its equivalent. When alternate pipe sizes andshapes are used, a statement of justification, including justifi-cation methodology, calculations employed, and all site spe-cific field data collected shall be prepared. A copy of thejustification shall become part of the system documentationand shall be provided to the building owner.

7.3.2.2 All pipe joints and connections in radon mitigationsystems, both interior and exterior, shall be sealed permanently.Exceptions include installation of radon fans (see 7.3.3.6) andsump covers (see 7.3.2.8).

7.3.2.3 Radon system piping installed in the interior or onthe exterior of a building, should be insulated where conden-sation on the pipe’s exterior may drip onto and damage ceilingsand floors, etc., and where water vapor, from the soil, maycondense inside the pipe, and then freeze partially or fullyblocking the soil-gas exhaust.

7.3.2.4 Radon system piping shall be fastened to the struc-ture of the building with hangers, strapping, or other supportsthat will secure it adequately. Radon system piping shall not beattached to or supported by existing pipes, ducts, conduits, orany kind of equipment. Radon system piping shall not blockwindow and doors or access to installed equipment.

7.3.2.5 Supports for radon system piping should be installedat least every 6 ft (2 m) on horizontal runs. Vertical runs shallbe secured either above or below the points of penetrationthrough floors, ceilings, and roofs, or at least every 8 ft (2.5 m)on runs that do not penetrate floors, ceilings, or roofs.

7.3.2.6 To prevent blockage of air flow into the bottom ofsuction point pipes, they shall be supported and secured in apermanent manner that prevents their downward movement tothe bottom of suction pits or sump pits, or into the soil beneatha soil-gas-retarder membrane. For guidance on submembranepiping, see 7.3.8.3.

7.3.2.7 Horizontal runs in radon system piping shall besloped to ensure that water from rain or condensation drainsdownward into the ground beneath the slab or soil-gas-retardermembrane.

7.3.2.8 If suction point pipes are installed to draw soil gasfrom sump pits, the system shall be designed to facilitateremoval of the sump pit cover for sump pump maintenance.

7.3.2.9 To reduce the risk of vent stack blockage due toheavy snow fall, to reduce the potential for re-entrainment ofradon into the living spaces of a building, and to prevent directexposure of individuals outside of buildings to high levels ofradon, the discharge from vent stack pipes of active soildepressurization systems shall meet the following minimumrequirements. The discharge from vent stack pipes shall be:

(1) Vertical and upward, outside the structure, at least 10 ft(3 m) above the ground level, above the edge of the roof, andshall also meet the separation requirements of (2) and (3).

Whenever practicable, they shall be above the highest roof ofthe building and above the highest ridge.

(2) Ten feet (3 m) or more away from any window, door, orother opening into conditioned or otherwise occupiable spacesof the structure, if the radon discharge point is not at least 2 ft(0.6 m) above the top of such openings.

(3) Ten feet (3 m) or more away from any opening into theconditioned or other occupiable spaces of an adjacent building.Chimney flues shall be considered openings into conditioned orotherwise occupiable space.

(4) For vent stack pipes that penetrate the roof, the point ofdischarge shall be at least 12 in. (0.3 m) above the surface ofthe roof. For vent stack pipes attached to or penetrating thesides of buildings, the point of discharge shall be vertical anda minimum of 6 in. (150 mm) above the edge of the roof andin such a position that it can neither be covered with snow, orother materials nor be filled with water from the roof or anoverflowing gutter. In areas where it snows the point ofdischarge shall be 12 in. (0.3 m) above the surface of the roof.

(5) When a horizontal run of vent stack pipe penetrates thegable end walls, the piping outside the structure shall be routedto a vertical position so that the discharge point meets therequirements of (1), (2), (3), and (4).

(6) Points of discharge that are not in a direct line of sightfrom openings into conditioned or otherwise occupiable spacebecause of intervening objects, such as dormers, chimneys,windows around the corner, etc. shall meet the separationrequirements of (1), (2), (3), (4) and (5).

NOTE 1—Measurements from the point of discharge to openings intothe conditioned or otherwise occupiable spaces of the structure shall bemade from the point of discharge to the closest part of any opening intosuch space. For example, to determine compliance with 7.3.2.9, when thelocation of a planned vent stack discharge can not be seen from a dormerwindow, the contractor would determine whether the required separationexisted by routing a flexible measuring tape between the planneddischarge point location and the part of the dormer window that is theshortest distance away. The measuring tape must follow the shortestpossible path, and be allowed to bend where it passes intervening part(s)of the dormer.

7.3.3 Radon Fan Installation Requirements:7.3.3.1 Radon fans shall be sized to provide the pressure

difference and air flow characteristics necessary to achieve theradon reduction goals established for the specific mitigationproject. Guidelines for sizing radon fans and piping can befound in “Industrial Ventilation: A Manual of Standard Prac-tice, 23rd Edition,”9 and in Appendix X3.

7.3.3.2 Radon fans used in active soil depressurization(ASD) radon mitigation systems shall be installed eitheroutside the building, or inside the building, outside of occupi-able space and above the conditioned (heated/cooled) spaces ofa building. Radon fan location is chosen to minimize the risk ofradon entry into living spaces which could result from leaks inradon fan housings or in the vent stack piping above the radonfan. Preferred locations include places on the exterior of thebuilding, unconditioned house and garage attics not suitable foroccupancy, and other unconditioned house and garage loca-tions not suitable for occupancy, which have no occupiable orconditioned spaces above them.

9 Available from American Conference of Governmental Industrial Hygienists,Inc., 1330 Kemper Meadow Dr., Suite 600, Cincinnati, OH 45240.

E 2121 – 03


7.3.3.3 Radon fans shall be installed in a configuration thatavoids condensation buildup in the radon fan housing.

7.3.3.4 Radon fans mounted on the exterior of buildingsshall be rated for outdoor use or installed in a weather proofprotective housing.

7.3.3.5 Radon fans shall be mounted and secured in amanner that minimizes transfer of vibration to the structuralframing of the building.

7.3.3.6 To facilitate maintenance and future replacement,radon fans shall be installed in the vent pipe using removablecouplings or flexible connections that can be tightly secured toboth the radon fan and the vent pipe.

7.3.3.7 Outside air intake vents of fan powered systemsshall be screened to prevent the intake of debris. Screens shallbe removable to permit cleaning or replacement and buildingowners shall be informed of the need to periodically replace orclean such screens.

7.3.4 General Sealing Requirements:7.3.4.1 Openings around the suction point piping penetra-

tions of the slab, accessible openings around utility penetra-tions of the foundation walls and slab, and other openings inslabs cast over gas permeable soils or aggregates, that reducethe pressure field extension, and the effectiveness of soildepressurization systems, shall be sealed, using methods andmaterials that are permanent and durable. For guidance onsump pits and sump pit covers see 7.3.6.1 and 7.3.6.2.

7.3.4.2 Sealing the Floor-Wall Joint—Sealing openings andcracks where the slab meets the foundation wall is sometimesappropriate. When urethane caulk or equivalent material is tobe used, and when the joint is greater than1⁄2in. (13 mm) inwidth, a foam backer rod or other comparable filler materialshould be inserted into the joint before the application of thesealant. For guidance on channel and French drain sealing, see7.3.13.3.

NOTE 2—Field experience has shown that sealing the floor-wall jointand small cracks in the slab of poured concrete foundation systems ofsub-slab depressurization (SSD), sump pit depressurization (DPD), anddrain tile depressurization (DTD) systems usually is not necessary whenan active soil depressurization is employed. Sealing is desirable whensignificant below grade air leakage is occurring, or when the air flow intothe gas permeable layer below the slab is creating objectionable noise.Failure to limit air flow into the depressurized soil of an active soildepressurization system may be a contributing factor to a backdraftcondition. Submembrane depressurization (SMD) and block wall depres-surization (BWD) systems, active or passive, and any passive radonreduction system requires more thorough sealing.

7.3.4.3 When installing baseboard-type suction systems, allseams and joints in the baseboard material shall be joined andsealed using materials recommended by the manufacturer ofthe baseboard system. Baseboards shall be sealed to walls andfloors with adhesives also designed and recommended for suchinstallations.

7.3.4.4 Utility and other penetrations through a soil-gas-retarder membrane shall be sealed.

7.3.5 Active Sub-Slab Depressurization (SSD) Require-ments:

7.3.5.1 To enhance pressure field extension, when the sub-slab material exhibits poor gas-permeability, it is helpful toexcavate as much as 1 ft3 (28 L) of sub-slab material below and

around each suction point pipe. Even when the sub-slabmaterial is highly permeable, like crushed stone, the end of thesuction point pipe should have an excavated hole, at least onepipe diameter deep, directly below it.

7.3.6 Sump Pit Requirements:7.3.6.1 Sump pits or other large openings in slabs or

basement walls that allow a significant amount of soil gasleakage into the basement or air leakage into the sub-floor areasshould be covered and sealed (see 7.4.7 and 7.4.8 for details onsump covers and sealing materials).

7.3.6.2 When a radon mitigation system is designed to drawsoil-gas from a sump pit, a sump cover shall be installed asdescribed in 7.3.13.4, 7.4.7, and 7.4.8.

7.3.7 Drain Tile Depressurization (DTD) Requirements:7.3.7.1 Whenever a DTD radon mitigation system that is

intended to depressurize a sub-slab area by drawing soil-gasfrom a perimeter drain tile loop (internal or external) isinstalled, all drain lines extending from the drain tile loop todaylight shall have a one-way flow valve, a water trap, or othercontrol device installed to prevent outdoor air from entering thesub-slab area. The control device is intended to prevent airfrom entering the drain line but not prevent water from flowingout of the drain line.

7.3.8 Submembrane Depressurization (SMD) Requirements:7.3.8.1 Any seams in soil-gas-retarder membranes (not

covered by concrete slabs) used for submembrane depressur-ization systems, passive or active, shall be lapped at least 12 in.(300 mm). The membrane’s seams shall be sealed. Themembrane shall be sealed around posts and other penetrations.The membrane shall be sealed, at its edges, to the walls to theextent practical. When there are indications that water is likelyto collect on the membrane, it shall be fitted with trappeddrains at the lowest part of the locations that are likely to bewet.

7.3.8.2 Passive submembrane depressurization systems,which are installed while anticipating possible activation, shallmeet all the requirements for an active submembrane depres-surization (SMD) systems, but without the radon fan andmonitor.

7.3.8.3 Active submembrane depressurization (SMD) sys-tems may be noisy. The noise can be reduced by sealing themembrane (see 7.3.8.1) and the design of the submembranesuction point. Sealing reduces the amount of air leakage and itsassociated noise, and also improves the pressure field extensionunder the membrane. Submembrane suction point designs, thatbury a special intake end of a suction point pipe in a deep bedof clean 1-in. (25-mm) aggregate, significantly reduce the noiseassociated with air entering the end of the suction point pipe.The special suction point pipe’s intake end has eight or morehorizontal or vertical slots, each being1⁄2 in. (13 mm) wide, andcut into the lowest foot (0.3 m) of the suction point pipe. If theslots are horizontal, they go half way through the pipe.

7.3.9 Hollow Block-Wall Depressurization (BWD) Require-ments:

7.3.9.1 When a hollow block wall depressurization (BWD)system is used to mitigate radon, openings in the tops of suchwalls and all accessible openings or cracks in the interiorsurfaces of the walls should be closed and sealed with

E 2121 – 03


polyurethane or equivalent caulks, expandable foams, or otherfillers and sealants. Large, inaccessible openings or cracksshould be disclosed to the client and included in the documen-tation.

7.3.10 Crawlspace Depressurization (CSD)—Crawlspacedepressurization is usually not the first choice radon mitigationmethod for crawlspaces because of its greater potential forhazardous failure, that is, backdrafting, and the probability of ahigh energy loss associated with its operation during the colderand hotter months.10 Sub-slab and submembrane depressuriza-tion are the crawlspace mitigation methods that should be usedwhenever possible.

7.3.10.1 When crawlspace depressurization (CSD) is usedfor radon mitigation, cracks and openings in floors above thecrawlspace, which would permit conditioned air to pass fromthe living spaces to the crawlspace shall be sealed to the extentpracticable. Openings or cracks that are determined to beinaccessible or beyond the ability of the contractor to seal shallbe disclosed to the client and included in the documentation.

7.3.10.2 Crawlspace depressurization (CSD) shall not beused as a radon control system when combustion appliancesare installed within the crawlspace, or within an abuttingcrawlspace or basement, or where adequate isolation (fromdepressurization) does not exist or cannot be created in apractical manner, between interior spaces containing one ormore combustion appliances and the crawlspace.

7.3.10.3 Crawlspace depressurization (CSD) shall not beused as a radon control system when evidence suggests thatfriable asbestos material exists in the crawlspace, or whenwork in the crawlspace would render nonfriable asbestosmaterial friable. If asbestos is to be removed from the crawl-space, to allow the installation of a crawlspace depressurization(CSD) system, the contractor shall employ trained and certifiedasbestos removers whose work will be undertaken in a mannerwhich complies with applicable asbestos regulations, includingthose of EPA and OSHA (see 2.2).

7.3.11 Combination Foundations:7.3.11.1 Buildings with elevated radon levels may have

more than one foundation type. Mitigation may be required inparts of the building involving one or more foundation types.Foundation types include slab-on-grade, basement, and crawl-space. Isolation of foundation spaces using barriers intended tokeep radon from passing, for example, from the crawlspace tothe basement or vise versa are not recommended, becausewalls built using available building trade techniques, usuallydo not accomplish their isolation objective. In addition, if thepurpose of the isolation is to seal off the crawlspace to enablecrawlspace depressurization, it is not recommended. Crawl-space depressurization usually is not the first choice radonmitigation method for crawlspaces because of its greaterpotential for hazardous failure, that is, backdrafting, and theprobability of a high energy loss associated with its operationduring the colder and hotter months. Sub-slab and submem-

brane depressurization are the crawlspace mitigation methodsthat should be used whenever possible.

7.3.12 Electrical Requirements:

NOTE 3—For purposes of this section, electrical power is assumed to beprovided by 120 V, 15, 20, or 30 ampere circuits; however, for all casesand all situations see 7.3.12.1 for guidance.

7.3.12.1 Wiring for all active radon mitigation systems shallconform to provisions of the “1999 National Electrical CodeHandbook, Eighth Edition”11 and any additional local regula-tions.

7.3.12.2 Wiring shall not be located inside the radon systempiping or within any other heating or cooling ductwork.

7.3.12.3 Any plugged cord used to supply power to a radonfan shall be no more than 6 feet (2 m) in length.

7.3.12.4 No plugged cord may penetrate a wall or beconcealed within a wall.

7.3.12.5 A disconnecting means is a switch, a plugged cord,or a branch circuit overcurrent device. A disconnecting meansshall be present in the electric circuit powering radon fans. Thedisconnecting means shall be located within sight of the radonfan, except when the fan motor develops1⁄8th horsepower orless. The branch circuit overcurrent device is permitted to bethe disconnecting means when the fan motor develops1⁄8thhorsepower or less. The primary purpose of the fan’s discon-necting means is to termporarily disconnect the fan’s electricpower when maintenance is performed. Operation of the radonfan’s disconnecting means should not interrupt the power toother electrical devices in the dwelling. See “1999 NationalElectrical Code Handbook, Eighth Edition”11 Articles 430-102(b) and 430-109(b), (c), and (f). Also see Appendix X4,Determining Radon Fan Motor Horsepower.

7.3.12.6 Flexible plugged cords, properly rated for electricalcapacity and weather, may be used on radon fans inside oroutside the building. These flexible plugged cords may alsoserve as a disconnecting means inside or outside the building.Radon fans, cords, plugs, receptacles, receptacle enclosures,switches, switch enclosures, etc. intended for outside use musthave a weatherproof and unattended use rating, and aredifferent than what is generally used inside the building. See“1999 National Electrical Code Handbook, Eight Edition.”11

(Warning—A hard-wired electrical connection (with a discon-nect switch) may be a preferable alternative to a flexibleplugged cord connection for radon fans installed outdoors.There are safety issues and other disadvantages to flexibleplugged cords being installed outdoors. Children may playwith the outdoor cord or receptacle. Because the protection ofwires in an outdoor plugged flexible cord radon fan installationmay not equal that of a hard wired outdoor installation, thewiring may be subjected to greater risk of accidental damage.The outside flexible plugged cord, which may be located whereaccess to it is not easily controlled, can be unplugged to freethe receptacle for other purposes, and the radon fan may not beplugged in again.)

7.3.13 Drain Installation Requirements:

10 Henschel, D.B., “Indoor Radon Reduction in Crawl Space Houses: A Reviewof Alternative Approaches,” Indoor Air 2 (2), 1994, 272–278, available fromInternational Society of Indoor Air Quality and Climate; ISIAO Secretariat, ViaMagenta 25, 20020 Busto Garolfo (Milan), Italy.

11 Available from National Fire Protection Association, Inc., One BatterymarchPark, Quincy, MA 02269.

E 2121 – 03


7.3.13.1 If a drain flows directly into the soil beneath theslab or through solid watertight pipe to a soakaway or todaylight through a broken or perforated pipe, the drain pipeshould have a trap or a one-way flow valve as described in7.3.7.1.

7.3.13.2 If condensate drains from heating or air condition-ing units terminate beneath the floor slab, a trap should beinstalled in the drain that provides a minimum 6-in. (150-mm)standing water seal depth, or the drain should be rerouteddirectly into a trapped floor drain, or connected to a condensatepump.

7.3.13.3 Perimeter (channel or French) drains, open to thesoil, should be sealed in a manner that will retain the channelas a water control system. See EPA “Radon Reduction Tech-niques for Existing Detached Houses, Technical Guidance(Third Edition) for Active Soil Depressurization Systems.”

7.3.13.4 When a sump pit, which is the only system in thebasement for protection or relief from excess surface water, iscovered for radon control purposes, an alternative drainagesystem shall be provided. This alternative system may be a newtrapped floor drain leading to the sump or a trapped draininstalled in the sump pit cover.

7.3.14 HVAC Installation Requirements:7.3.14.1 Modifications to an existing HVAC system, which

are proposed to mitigate elevated levels of radon, shall bereviewed by a certified and licensed mechanical contractor.

7.3.14.2 Foundation vents that are installed specifically toreduce indoor radon levels by increasing the natural ventilationof a crawlspace, shall be noncloseable. In crawlspaces areassubject to freezing conditions, water supply, and other kinds ofpipes or equipment, which could be damaged by freezing shallbe insulated or otherwise protected from freezing.

7.3.15 Heat Recovery Ventilation (HRV):

NOTE 4—HRV as a method for radon control is recommended onlywhen an active soil depressurization system cannot be used, and the initialair exchange rate is low enough to indicate a high probability of success.

7.3.15.1 Heat recovery ventilation (HRV) systems shall notbe installed in areas of the building that contain friable asbestosmaterial or where the work would render nonfriable asbestosmaterial friable, until a determination has been made by aproperly trained or certified person that such work will beundertaken in a manner which complies with applicableasbestos regulations, including those of EPA and OSHA. See2.2.

7.3.15.2 In HRV installations, interior supply and exhaustports shall be a minimum of 12 ft (3.8 m) apart, horizontally.Exterior supply and exhaust ports shall be positioned aminimum of 12 in. (30 cm) above the ground or higher ifnecessary to avoid blockage by snow, leaves, or other thingsand be a minimum of 10 ft (3 m) apart, horizontally. Exteriorsupply and exhaust ports shall be located away from areaswhere stored material or equipment could block airflow.Exterior supply/intake ports shall be kept away from where carand truck exhaust or other air pollutants may be present.

7.3.15.3 Contractors installing HRV systems shall verifythat the incoming and outgoing airflow is balanced to ensurethat the system does not contribute to the negative pressurewithin the building. Contractors shall inform building owners

that periodic filter replacement and inlet grill cleaning arenecessary to maintain a balanced airflow. This maintenanceinformation should be included in the documentation.

7.3.15.4 Both internal and external intake and exhaust ventsin HRV systems shall be covered with wire mesh or screeningto prevent entry of animals or debris, or injury to occupants.

7.4 Materials:7.4.1 All mitigation system electrical components shall be

listed.7.4.2 As a minimum, all plastic radon system piping in

depressurization systems shall be made of Schedule 20 PVC orABS piping material. Schedule 40 piping is recommended foruse in garages and in other internal and external locationssubject to weathering or physical damage. For purposes of thissection the piping, that is used under slabs or membranes toenhance pressure field extension in place of or in conjunctionwith an aggregate layer, is not considered to be radon systempiping and does not have to be solid or rigid PVC or ABS pipeand does not have to conform to any particular wall thicknessor pressure rating requirement. For piping used under slabs,membranes and in aggregate materials, however, crushstrength is important because piping with no crush strengthwould be easily crushed or flattened by traffic or items storedover it.

7.4.3 Fittings used in radon system piping shall be of thesame material as the piping itself. This material compatibilityenables the required cementing of all piping connections;however, when mounting radon fans and when making remov-able connections which facilitate sump pit maintenance, rubbercouplings suitable for use in sanitary sewer systems shall beused instead of cemented pipe joints. For radon fan installationand removal, see 7.3.3.6. For sump pit cover installation andremoval see 7.3.2.8.

7.4.4 The plastic pipe cleaner and cement shall be compat-ible with the kind of plastic in the radon system piping andshall be used as recommended by its manufacturer.

7.4.5 When sealing cracks in slabs and other small openingsaround penetrations of the slab and foundation walls, caulks,and sealants designed for such application shall be used.Urethane sealants are recommended because of their suitabilityand durability.

7.4.6 When sealing holes for plumbing rough-in or otherlarge openings in slabs and foundation walls that are below theground surface, non-shrink mortar, grouts, expanding foam, orsimilar materials designed for such application should be used.

7.4.7 Sump pit covers shall be made of durable plastic orother rot proof rigid material and be designed to permitair-tight sealing. To enable easy removal for sump pumpservicing, the cover shall be sealed using silicone or othernonpermanent type caulking materials or an air-tight gasketand mechanical fasteners. Sump lids with viewing ports arerecommended to permit inspection of the sump without remov-ing the lid.

7.4.8 Penetrations of sump covers to accommodate electri-cal wiring, water ejection pipes, or suction point pipes shouldbe designed to permit air-tight sealing around penetrations,using caulk or grommets.

E 2121 – 03


7.4.9 Flexible membranes installed in crawlspaces as soil-gas-retarders shall be a minimum of 6 mil (0.15-mm) (or 3-mil(0.08-mm) thickness if cross-laminated) polyethylene orequivalent flexible material. Heavier gage sheeting or a pro-tective covering for the sheeting should be used when crawl-spaces are used for storage, or frequent entry is required formaintenance of utilities. The durability of flexible membranesshould be evaluated before the membranes are selected andinstalled. Polyethylene is damaged by the ultraviolet radiationin sunlight. See Specification E 1745 permeance and durabilityspecifications for water vapor retarders, which may be used assoil-gas-retarders.

7.4.10 Any wood or other material that contacts masonry orsoil shall be pressure treated, or otherwise protected andresistant to decay and insect attack. Such material would beused to attach membranes to crawlspace walls, etc.

7.5 Monitors and Labeling:7.5.1 All active radon mitigation systems shall include a

mechanism to monitor system performance (air flow or pres-sure) and provide a visual or audible indication of systemdegradation and failure. The mechanism shall be simple to reador interpret and be located where it is easily seen or heard. Themonitoring device shall be capable of having its calibrationquickly verified on site. The requirement to provide an airflowor pressure operated monitor, does not prohibit additionalperiodic or continuous use of approved radon test devices toconfirm the ongoing effectiveness of the radon mitigationsystem.

7.5.2 If a pressure operated radon monitor is powered byhouse current, it shall be installed on a nonswitched circuit andbe designed to reset automatically after a power failure. If themonitor is battery powered, it shall be equipped with alow-battery power warning feature.

7.5.3 Mechanical radon mitigation system monitors, such asmanometer type pressure gauges, shall be clearly marked toindicate the initial pressure readings.

7.5.4 A system description label shall be placed on themitigation system, the electric service entrance panel, or otherprominent location. This prominently located label shall belegible from a distance of at least 3 ft (1 m) and display thefollowing information: the words “Radon Reduction System,”the installer’s name and phone number, the date of installation,and an advisory that the building should be tested for radon, bya person qualified by training and certification and licensure, orthe occupant at least every two years or as required orrecommended by state or local agencies. In addition, allexposed and visible interior radon system piping shall beidentified with at least one label on each floor that identifies thepipe as a part of a radon reduction system, such as “RadonReduction System,” “Radon System Pipe,” “Component ofRadon Reduction System,” “Radon Pipe,” etc.

7.5.5 The circuit breaker(s) controlling the circuits on whichthe radon fan and system failure warning devices operate shallbe labeled using the word “Radon,” for example, “Radon,” orif two circuits, “Radon Fan,” and “Radon Monitor.” If otherrooms and appliances are on the circuit, they should also beshown on the label.

7.6 Post-Mitigation Testing:7.6.1 Upon completion of radon mitigation work, the con-

tractor shall take steps to ensure that the effectiveness of theradon reduction system is demonstrated using one of threeapproaches: 1) the contractor leaves an approved radon test kitwith the person responsible for the building and instructs thatperson, in writing, that a radon test should be performed usingthe supplied radon test kit or any other approved radon test kit;2) the contractor hires a certified and/or licenced independentradon tester to perform the required radon test, or 3) thecontractor uses the test results, when available, from a reloca-tion company that has arranged for post-mitigation testing.Regardless of the approach used, the contractor shall advise thetester or relocation company that post-mitigation radon testingshould be initiated no sooner than one day (24 h) and no laterthan 30 days following completion and activation of themitigation system(s). In any case the contractor shall makedeliberate attempts to obtain a copy of the post-mitigation testresults and keep the copy as a part of the system documentationaccording to 7.7.1.

7.7 Documentation:7.7.1 Contractors shall keep records of all radon mitigation

work performed and maintain those records for three years orfor the period of any warranty or guarantee, whichever islonger.

7.7.2 Health and safety records, including worker radonexposure logs, shall be maintained for a minimum of 20 years.

7.7.3 Upon completion of the mitigation project, contractorsshall provide clients with information that includes:

7.7.3.1 Copies of contracts and warranties.7.7.3.2 A description of the mitigation system installed and

its basic operating principles.7.7.3.3 A description of the proper operating procedures of

any mechanical or electrical systems installed, including manu-facturer’s operation and maintenance instructions.

7.7.3.4 A list of appropriate actions for clients to take if thesystem failure warning device indicates system degradation orfailure.

7.7.3.5 The name, address, and phone number of the con-tractor.

8. Keywords

8.1 depressurization; radon; radon entry; radon mitigation;radon reduction

E 2121 – 03


APPENDIXES

(Nonmandatory Information)

X1. ACTIVE (FAN-POWERED) RADON MITIGATION METHODS

Table X1.1 may be used by readers to find the various

mitigation methods covered by the standard.

X2. ACTIVE SOIL DEPRESSURIZATION (ASD) PRINCIPLES OF OPERATION

X2.1 Radon is forced into dwellings through radon entrypathways, which are below ground level. These pathways areopenings in foundation walls and floors like cracks, utilitypenetrations, and floor-wall joints. Other mechanisms for radonentry into dwellings include diffusion and emanation. Radonentry by diffusion, through apparently solid materials, is rarelysignificant in amount, and ignored when designing and install-ing ASD radon mitigation systems. Another extremely raresource of radon, is emanation from building material whichcontain some form of uranium or its progeny. Rising warm airinside the dwelling causes the air pressure in the lower levelsof the dwelling to be reduced and the air pressure in the higherparts of the building to increase. This is called the stack effect.

X2.2 Wind can either pressurize or depressurize interiorparts of a building, as well as change the air pressure on theexterior (above and below grade) of a building. The wind effectdepends on the building configuration (shape, window, anddoor position etc.) and the wind’s speed and direction. Airflows from a higher pressure place to a lower pressure place ifthere is an opening between the places. This is true in thecolder winter months and in the warmer summer months. In thewinter months, fresh air enters the lower levels of dwellingsthrough above ground (grade) cracks and joints. Soil-gas,containing radon in various concentrations, enters throughbelow grade foundation cracks and joints. This happens be-cause in the winter, warm air inside the building rises (the stackeffect), depressurizing the interior lower levels of the building.

The continuous stack effect and the intermittent dwellingdepressurizations due to exhausts from combustion appliances,bathroom and kitchen fans, clothes driers, etc., and the inter-mittent pressurization or depressurization associated with windeffects usually combine to create negative indoor air pressure,compared to outside (both above and below grade). In thesummer, when it is cooler inside than outside, indoor air maybe forced out of the dwelling through cracks and joints in thelower parts of the structure. This happens because coolerheavier air sinks (a reverse stack effect) and pressurizes theinside lower levels of the structure. The continuous reversestack effect pressurization and the intermittent depressuriza-tions due to exhausts from combustion appliances, bathroomand kitchen fans, clothes driers, etc., and the intermittentpressurization or depressurization associated with wind effectsnet out to either create a negative or positive indoor air pressurecompared to outside, both above and below grade. When theindoor lower level’s pressurizations/depressurizations net outto a negative pressure compared to below grade outdoorpressure, soil-gas, that may or may not contain radon, is drawninto the structure. When the indoor below gradepressurizations/depressurizations net out to be positive, indoorair flows out of the cracks and joints in the below grade partsof the structure and no soil-gas or radon enters the dwelling.Indoor radon concentrations generally are higher during thecolder winter months.

X2.3 When an active soil depressurization (ASD) radon

TABLE X1.1 Active (Fan-Powered) Radon Mitigation Methods

Radon Mitigation MethodPracticeSection

DefinitionSection

Active soil-depressurization (ASD) 3.2.1

Sub-slab depressurization (SSD) 7.3.5 3.2.22Sump (pit) depressurization (SPD) 7.3.6 3.2.25Drain tile depressurization (DTD) 7.3.7 3.2.8Submembrane depressurization (SMD) 7.3.8 3.2.21Hollow block wall depressurization (BWD) 7.3.9 3.2.9

Ventilation 3.2.27

Crawlspace depressurization (CSD) 7.3.10 3.2.5Heat recovery ventilation (HRV) 7.3.15

E 2121 – 03


system is installed, one end of the radon system piping isconnected to a gas-permeable layer of material just below theslab of the dwelling; and the other end is routed to a locationoutside the building, where the soil-gas containing radon, canbe exhausted safely.

X2.3.1 A radon fan (generally rated between 50 and 150 W)is installed in the radon system piping as a means of depres-surizing the gas permeable layer.

X2.3.2 If the soil between the footings of a dwelling iscovered with a gas permeable layer, like crushed stone, theperformance of an ASD system is enhanced. Ideally, thefootings would rest on undisturbed soil of low permeability.

When turned on, the radon fan pulls soil-gas from the gaspermeable layer below the dwelling, that is, depressurizes thatsoil. When the fan is on, the active soil depressurization (ASD)system is on. By reversing the pre-mitigation air flows throughthe radon entry pathways, significant radon reduction isachieved. For the sub-slab depressurization (SSD) version ofthe ASD method of radon mitigation, indoor radon concentra-tions are significantly (80 to 99 %) reduced when air is flowingfrom inside the dwelling, through its below grade foundationcracks and joints, into the depressurized gas-permeable layer ofsoil underneath the dwelling.

X3. RADON SYSTEM PIPE SIZE AND RADON FAN SIZE AND LOCATION FOR SOIL DEPRESSURIZATION RADONREDUCTION SYSTEMS

X3.1 Radon system pipe and radon fan size considerations,for active soil depressurization systems, influence radon miti-gation system effectiveness, durability, efficiency, noise, vibra-tion, appearance and cost. These considerations also apply topassive soil depressurization system, because a design criteriaof a passive soil depressurization system is that it can beactivated. These considerations do not apply to heat recoveryventilator or crawlspace depressurization systems. Certainbasic considerations can be stated easily, more completediscussions are available, see EPA “Radon Reduction Tech-niques for Existing Detached Houses, Technical Guidance(Third Edition) for Active Soil Depressurization Systems,” and“Industrial Ventilation: A Manual of Standard Practice,” 23rdEdition,” 199810.

X3.2 Radon System Pipe Size Considerations:

X3.2.1 Nominal Pipe Size—For active soil depressurizationsystems the nominal size of radon vent stack piping is 4-in.(100-mm) inside diameter; the minimum inside diameter of aradon vent stack is 3-in. (75-mm).

X3.2.2 Wall Thickness—When compared to a thinnerwalled pipe, a thick walled Schedule 40 pipe is stronger, moredurable, more resistant to damage from the ultraviolet radiationin sunlight and quieter when air is flowing through it.

X3.2.3 Capacity to Move Air—The ability of a pipe toefficiently move air depends on its inside diameter. A 4-in.(100-mm) inside diameter pipe (ID) has approximately twicethe area of a 3-in. (75-mm) ID pipe. An equal volume of airflows through a large diameter pipe easier and quieter thanthrough a small diameter pipe. When an equal volume of airflows through a 3-in. (75-mm) ID pipe and a 4-in. (100-mm) IDpipe in the same amount of time, the velocity of the air in the3-in. (75-mm) pipe is approximately twice the velocity of theair in the 4-in. (100-mm) pipe. The higher air velocity increasesnoise and vibration. The higher air velocity causes greaterfriction loss, more noise, and lower fan effectiveness.

X3.2.4 Friction Loss—Friction loss in radon system pipingis important because it reduces the static pressure supplied bya radon fan that is available for depressurizing the soil in theactive soil depressurization system. Since friction loss isdependent on pipe inside diameter and the velocity of air

traveling through the pipe, larger diameter pipe may benecessary to accommodate the greater friction losses associatedwith longer or more complex piping configurations. Frictionloss is increased, where pipes bend, change size, and merge;friction also increases as pipe runs lengthen. The friction lossfor one 90° bend is up to 15 times that of a 1-ft (300–mm)length of pipe, depending on the velocity of air moving throughthe pipe. Long sweep pipe fittings have less friction loss thanregular or sharp bends. Long sweep bends are commerciallyavailable from distributers of Schedule 40 PVC-dwv fittingswhich are used for sanitary sewer plumbing.

X3.2.5 Noise—Air flow noises and discharge point noisesbecome objectionable at velocities of 1000 to 1500 ft/min (5 to8 m/s), which is equivalent to 90 to 130 ft3/min (2550 to 3680L/min) in 4-in. (100-mm) pipe.

X3.2.6 Intake Connection to Radon Fan—Pipe withoutbends should be connected straight into radon fan intakes. Ifpipe bends are located within a distance of ten pipe diametersfrom the radon fan’s intake, the efficiency of the fan may bereduced. For example, if 3-in. (75-mm) vent stack piping isconnected to the intake of a radon fan, ideally that pipingwould be straight for a distance of 2 ft 6 in. (0.8 m) from theintake. Available space often prevents use of such a long lengthof straight vent stack pipe immediately below the radon fan,but as long a run as practicable, approaching ten pipe diametersin length should be used at this location.

X3.2.7 Pipe Size and Fan Performance—If a smaller diam-eter pipe is chosen for use because of its appearance, becauseit fits better, because of its cost, etc., the performance of theradon mitigation system piping may be compromised, becausemore of the fan’s static pressure will be used to move airthrough the radon system piping rather than to depressurize thesoil.

X3.2.8 Durable, Long-Lived Design—Radon systems de-signed with thicker-walled, larger diameter radon system pipeslikely are to be stronger, and therefore more durable, and moreeffective at reducing indoor radon concentrations becausewhen over time, foundation cracks widen and lengthen, andnew cracks appear, there will be more capacity available tomove the additional air through the piping.

E 2121 – 03


X3.2.9 Pipe Restrictions—The radon system piping shouldnot have built in restrictions, that is, the inside diameter of thevent stack pipe should not be smaller than the suction pointpipe; and, the inside diameter of radon manifold piping shouldnot be smaller than the inside diameter of any suction pointpipe. The inside diameter of a vent stack pipe that is connectedto a manifold, should not be smaller than the largest insidediameter pipe used in the construction of that manifold.

X3.3 Radon Fan Size Considerations:

X3.3.1 Families of commonly used radon fans draw be-tween 50 and 150 W of power. One family of radon fansmanages between 90 and 300 cfm (2550 and 8500 L/min) at astatic pressure of 0.75 in. WG (190 Pa); another family handlesbetween 15 and 60 cfm (425 and 1700 L/min) at a staticpressure of 3 in. WG (750 Pa). The radon fan is selected tomaintain the desired depressurization under the slab or mem-brane in the permeable layer. The pressure field extension testis useful in determining acceptable radon fan size and charac-teristics. The depressurization goal is to maintain 0.025 to0.035 in. WG (6 to 9 Pa) everywhere under the slab, when theinside air pressure and the outside air are the same, as would bethe case when the basement door of a basement foundationwere left open.

X3.3.2 The larger diameter, more efficient radon systempiping may cost more to install, but should provide quieteroperation and improved soil depressurization performance fora given radon fan, because the radon fan does not have toprovide additional static pressure to make up for friction lossesin the piping system; the larger diameter pipe could also allowthe installation of a smaller radon fan.

X3.4 Radon Fan Location—Active soil depressurization(ASD) systems, of all types, carry high concentrations of radonin the radon system piping. It is vital that radon fans in ASDsystems be located and configured so as to minimize thepotential for leaks, in the radon system piping or the fan itself,which result in radon re-entry or re-entrainment into occupi-able spaces of the building. To address this issue, this standardpractice limits the location of radon fans in ASD systems toareas outside the building or to non-occupiable spaces, whichare above the conditioned space of the building. The result isthat all radon system piping, which passes through occupiablespace, is maintained under negative pressure relative to theambient air. Any leaks, which might develop, in the occupiablespace, would result in moving noncontaminated air into theradon system rather than allowing soil gas containing highconcentrations of radon to escape. This practice is consistentwith the management of other hazardous effluents.

X4. DETERMINING RADON FAN MOTOR HORSEPOWER

X4.1 Fan motor horsepower is an issue for radon contrac-tors because wiring requirements change based on the horse-power of the fan’s motor. Motors,1⁄8th or less horsepower,have different wiring requirements than higher horsepowermotors. Some motors, appropriate for use in radon fans,develop less than1⁄8th horsepower and others develop more.The motors with the higher horsepowers are used for lowsuction ASD systems with 6 in. (150 mm) ID radon vent stackpiping, and with high suction ASD systems that develop 15 in.WG (3.7 kPa) or more suction.

X4.2 Horsepower is not an issue when the disconnectingmeans is installed within sight of the fan, because the electriccode does not prohibit the installation of the disconnectingmeans within sight of fans with1⁄8th or less horsepower motors.

X4.3 Because horsepower ratings are not provided on mostradon fan labels, methods for determining the motor horse-power are suggested.

X4.3.1 Fan motor horsepower and efficiency, when notpublished, should be available from the fan’s manufacturer ordistributor.

X4.3.2 Radon fan motor horsepower can be calculated,when efficiency is know. The general formula is: Output(horsepower) equals input (watts) divided by 746 (whichconverts watts to horsepower) times the motor efficiency(factor). The equation is:HP 5 ~Watts/ 746! X ~Eff!

where:HP = motor horsepower,Watts = the rating shown on fan’s label,Eff = fan motor efficiency.

To determine the horsepower of a 95 watt in-line tubular radonfan:1. Assume an efficiency based on the fan’s motor type.(Assume about 50 % for the motor type used in many in-linetubular radon fans.)2. Solve the equation to determine that the 95 watt fan motorprobably develops about1⁄16th horsepower, assuming 50%motor efficiency.

E 2121 – 03


ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.

This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or [email protected] (e-mail); or through the ASTM website(www.astm.org).

E 2121 – 03


APPENDIX 2

APPENDIX 2

HP Series Fansfor Radon Applications

Trust theIndustryStandard!

Why put your reputation at stake by installing a fan you know won'tperform like a Fantech? For nearly fourteen years, Fantech has manufactured quality ventilation equipment for Radon applications.Fantech is the fan Radon contractors have turned to in over 1,000,000successful Radon installations worldwide.

Fantech HP Series Fans Provide theSolutions to meet the challenges ofRadon applications:

HOUSING• UV resistant, UL listed durable plastic• UL Listed for use in commercial

applications• Factory sealed to prevent leakage • Watertight electrical terminal box • Approved for mounting in wet loca-

tions - i.e. Outdoors

MOTOR• Totally

enclosedfor protection

• High efficiency EBM motorized impeller• Automatic reset thermal overload protection• Average life expectancy of 7-10 years under

continuous load conditions

RELIABILITY• Five Year Full Factory Warranty • Over 1,000,000 successful radon

installations worldwide

Improved UV resistance!Improved UV resistance!

Fantech has developed the HP Series fans specifically to suit the

higher pressure capability requirements needed in Radon Mitigation

applications. Most Radon Mitigators who previously used the

Fantech FR Series fans have switched to the new HP Series.

Performance CurvesFantech provides you with independently tested performance specifications.

The performance curves shown in this brochure are

representative of the actual test results recorded at

Texas Engineering Experiment Station/Energy Systems

Lab, a recognized testing authority for HVI. Testing was

done in accordance with AMCA Standard 210-85 and

HVI 915 Test Procedures. Performance graphs show air

flow vs. static pressure.Use of HP Series fans in low resistance applications such as bathroom ventingwill result in elevated sound levels. We suggest FR Series or other Fantech fansfor such applications.

HP FEATURESINCLUDE• Improved UV resistant

housings approved for commercial applications.

• UL Approved for WetLocations (Outdoors)

• Sealed housings and wiring boxes to prevent Radon leakage or water penetration

• Energy efficient permanent splitcapacitor motors

• External wiring box

• Full Five Year Factory Warranty

HP Series Fans are specially designed with higher pressure capabilities for Radon Mitigation applications

Performance Data

FanModel

HP2133HP2190HP175HP190HP220

WattageRange14 - 2060 - 8544 - 6560 - 85

85 - 152

Max.Amps

CFM vs. Static Pressure in Inches W.G.

0.170.780.570.781.30

Max.Ps

0.841.931.662.012.46

0"134163151157344

0.5"68

126112123260

0.75"19

10491

106226

1.0"-

817089

193

1.25"-

584067

166

1.5"-

351245

137

1.75"-

15-

18102

2.0"---1

58

Volts

115115115115115

HP2133 and 2190 Radon Mitigation Fans

HP2133 – For applications where lower pressure and flow are needed. Record low power consumption of 14-20 watts! Often usedwhere there is good sub slab communication and lower Radon levels.

HP2190 – Performance like the HP190 but in a smaller housing. Performance suitable for the majority of installations.

Fans are attached to PVC pipe using flexible couplings.For 4” PVC pipe use Indiana Seals #156-44, Pipeconx PCX 56-44 or equivalent. For 3” PVC pipe use Indiana Seals #156-43, Pipeconx PCX 56-43 or equivalent.

4 1/2"

11/4" 11/4"

6 5/8" 9 3/8"

2.00

1.80

1.60

1.40

1.20

1.00

0.80

0.60

0.40

0.20

0.000 20 40 60 80

Flow Rate (CFM)

Sta

tic

Pre

ssur

e (In

. H2O

)

120100 140 160 180

HP2133

HP2190

Tested with 4" ID duct and standard couplings.

HP175 and HP190 Radon Mitigation Fans

HP220 Radon Mitigation Fan

HP175 – The economical choice where slightly less airflow is needed. Often used where there isgood sub slab communication and lowerRadon levels.

HP190 – The standard for Radon Mitigation. Ideallytailored performance curve for a vast majorityof your mitigations.

Fans are attached to PVC pipe using flexible couplings.For 4” PVC pipe use Indiana Seals #151-44, Pipeconx PCX 51-44 or equivalent.

For 3” PVC pipe use Indiana Seals #156-43, Pipeconx PCX 56-43 or equivalent.

0.00

0.20

0.40

0.60

0.80

1.00

1.20

1.40

1.60

1.80

2.00

0 20 40 60 80 100 120 140 160

Flow Rate (CFM)

Sta

tic

Pre

ssur

e (In

. H2O

)

HP175

HP190

HP 220 – Excellent choice for systems with elevatedradon levels, poor communication, multiplesuction points and large subslab footprint.Replaces FR 175.

Fans are attached to PVC pipe using flexible couplings.For 4” PVC pipe use Indiana Seals #156-64, Pipeconx PCX 56-64 or equivalent.

For 3” PVC pipe use Indiana Seals #156-63, Pipeconx PCX 56-63 or equivalent.

0.00

0.20

0.40

0.60

0.80

1.00

1.20

1.40

1.60

1.80

2.00

2.20

2.40

2.60

0 50 100 150 200 250 300 350

Flow Rate (CFM)

Sta

tic

Pre

ssur

e (In

. H2O

)

HP220



M|, M|,

2

6Z|,

10Z|,

2

9C|v

4C|v

3M|,

1 M|,

1M|,

5M|,

9C|,

1M|,

11C|v

6Z|v

5M|,

THIS WARRANTY SUPERSEDES ALL PRIOR WARRANTIES

FOR FACTORY RETURN YOU MUST:1) Have a Return Materials Authorization (RMA) number. This number

may be obtained by calling FANTECH, INC. at 1-800-747-1762.Please have Bill of Sale available.

2) The RMA number must be clearly displayed on the outside of the car-ton, or delivery will be refused.

3) All product being returned must be shipped prepaid and be accompa-nied with a copy of the Bill of Sale.

4) Product will be replaced/repaired and shipped back to buyer. No cred-its will be issued.

DURING THE FIRST THIRTY (30) DAYS:FANTECH, INC. will replace any product which has a factory defect inworkmanship or material. Product may be returned to either the point ofpurchase or the FANTECH factory, together with Bill of Sale, for an immediate replacement.

DURING THE FIRST THREE (3) YEARS: (excluding the above 30 day period)

FANTECH, Inc. will replace any product which has a factory defect inworkmanship or material. Product must be returned to the FANTECH factory, together with Bill of Sale, and identified with an RMA number.

DURING YEARS FOUR (4) and FIVE (5):FANTECH, INC. will repair or replace any product which has a factorydefect in workmanship or material. Product must be returned to theFantech FACTORY, together with a Bill of Sale, and identified with anRMA number.

THE FOLLOWING WARRANTIES DO NOT APPLY:Damages from shipping, either concealed or visible. Claim must be filedwith the carrier.Damages resulting from improper wiring or installation.Damages caused by acts of nature, or resulting from improper consumerprocedures such as:

Improper Maintenance,Misuse, abuse, abnormal use, or accident, orIncorrect electrical voltage or current.

Removal or alterations made on the FANTECH label control number ordate of manufacture.Any other warranty, expressed, written or implied, and to any consequen-tial or incidental damages, loss of property, revenues, or profit, or costs ofremoval, installation or reinstallation, for any breach of warranty.

WARRANTY VALIDATION:The end user must keep a copy of the Bill of Sale to verify purchase date.

Distributed by:1712 Northgate Blvd.Sarasota, Florida 34234Phone: 800-747-1762Fax: 800-487-9915Phone: 941-309-6000Fax: 941-309-6099www.fantech.nete-mail: [email protected]

The Original Mitigator – Fantech's FR Series Fans

a

d1d2

b c

ø D

FR Series performance is shown with ducted outlet. Per HVI’s Certified Ratings Program, charted air flow performance has been derated by a factor based on actual test results and the certified rate at .2 inches WG.

Five (5) Year Warranty

model

FR100

FR110

FR125

FR140

FR150

FR160

FR200

FR225

FR250

øD

9 1/2

9 1/2

9 1/2

11 3/4

11 3/4

11 3/4

13 1/4

13 1/4

13 1/4

d1

3 7/8

3 7/8

–

5 7/8

5 7/8

5 7/8

7 7/8

7 7/8

–

d2

4 7/8

4 7/8

4 7/8

6 1/4

6 1/4

6 1/4

9 7/8

9 7/8

9 7/8

a

6 1/8

6 1/8

6 1/8

5 7/8

5 7/8

6 3/8

6 1/4

6 1/4

6 1/4

b

7/8

7/8

7/8

1

1

1

1 1/2

1 1/2

–

c

7/8

7/8

–

7/8

7/8

7/8

1 1/2

1 1/2

1 1/2

Performance Data

Dimensional Data

All dimensions in inches

Form#HP0104

FanModel

EnergyStar

RatedWatts

WattageRange

Max.Amps

Max.Ps

DuctDia.RPM Volts 0" .2" .4" .6" .8" 1.0" 1.5"

FR100 2900 115 19 13 – 19 0.18 122 100 78 55 15 - - 0.87" 4"FR110 - 2900 115 80 62 – 80 0.72 167 150 133 113 88 63 41 0.60" 4"FR125 2950 115 18 15 – 18 0.18 148 120 88 47 - - - 0.79" 5"FR140 2850 115 61 47 – 62 0.53 214 190 162 132 99 46 - 0.15" 6"FR150 2750 120 71 54 – 72 0.67 263 230 198 167 136 106 17 1.58" 6"FR160 - 2750 115 129 103 – 130 1.14 289 260 233 206 179 154 89 2.32" 6"FR200 2750 115 122 106 – 128 1.11 408 360 308 259 213 173 72 2.14" 8"FR225 3100 115 137 111 – 152 1.35 429 400 366 332 297 260 168 2.48" 8"FR250 - 2850 115 241 146 – 248 2.40 649 600 553 506 454 403 294 2.58" 10"

CFM vs. Static Pressure in Inches W.G.

Choice of model is dependent on building characteristics including sub-slab materials and should be madeby a radon professional.

Model Watts Typical CFM vs. Static Pressure WC0" 0.5" 1.0" 1.5" 2.0"

-11-

57

-5520139

68132180260

134173275327

14-20

37-7152-7286-140

RP140

RP145RP260RP265

MaximumPressure

"WC0.8

2.11.82.5

Radon Mitigation FansSpecially designed for radon mitigation, RP SeriesFans provide superb performance, run ultra-quiet and are attractive. They are ideal for mostsubslab radon mitigation systems.

The following chart shows performance of RP Series fans:

FOR FURTHER INFORMATION CONTACT:

0902P/N 02008

A

B

C

-

94105207

C DimensionsModel A B C

Duct Size

4''

4''

6''6''

8.5''

8.5''

8.6''8.6''

RP140

RP145

RP260RP265

9.7''

9.7''

11.75''11.75''

ss 5-Year Warrantyss Quiet and attractivess Thermally protectedss Motorized impellerss ETL Listed - for indoor or outdoor usess Meets all electrical code requirementsss Rated for commercial and residential use

RP Series

PRODUCT DESCRIPTION

Mirafi® 500X is a woven geotextile comprised of UV stabi-lized polypropylene slit film. Mirafi® 500X provides excellentpuncture and tear resistant properties in addition to hightensile strengths.

FEATURES AND BENEFITS

• Construction. Woven construction offers excellentresistance to installation abuse.

• Strength. High modulus provide outstanding perfor-mance in a wide range of applications.

• Flow. Uniform openings provide excellent filtration andflow characteristics.

• Cost. Mirafi® 500X geotextiles were developed toimprove the economics and performance of roadwaysystems by reducing the amount of aggregaterequired, increasing the design life and reducing themaintenance cost, preventing periodic overstressing ofthe subgrade, and eliminating costly project delays byallowing all-weather construction.

APPLICATIONS

The use of Mirafi® 500X increases the stability of the basematerial. The geotextile allows for drainage but retainsand separates the soil above to stop subgrade materialfrom contaminating the base material. Mirafi® 500X pre-vents the compacted base course from pushing into thesubgrade. Mirafi® 500X is recommended as a separatorin all paver applications, but specifically in clay soil appli-cations.

PRODUCT DESCRIPTION

Mirafi® 140N is a nonwoven geotextile comprised ofpolypropylene staple fibers. Mirafi® 140N provides excel-lent physical and hydraulic properties in addition to hightensile strengths.

FEATURES AND BENEFITS

• Construction. Mirafi® 140N easily conforms to theground or trench surface for trouble-free installation.

• Strength. Mirafi® 140N withstands severe installationstresses with high puncture and burst resistance.

• Filtration. High permeability properties provide highwater flow rates while providing excellent filtrationproperties.

• Cost effective. Mirafi® 140N geotextiles provideeconomical solutions to many civil engineering appli-cations including a cost-effective alternative to graded-aggregate filters.

APPLICATIONS

Mirafi® 140N nonwovens are used in a wide variety ofapplications including separation, filtration, and protectionapplications.

Lightweight nonwovens are predominantly used for sub-surface drainage applications along highways, withinembankments, under airfields, and athletic fields. Forthese drainage structures to be effective, they must havea properly designed protective filter. Mirafi® N-SeriesNonwoven Geotextiles eliminate the problems of deter-mining the aggregate gradation required to match soilconditions.

Mirafi® 500X for Interlocking Concrete

Paver Stabilization

Mirafi 500X Woven Slit Film Geotextile Mirafi 140N Nonwoven Geotextile

Product DescriptionInnovative Geotextiles

Mirafi® 140N for Subsurface Drainage

PDS.500x140n.0304

www.mirafi.com

CORPORATE OFFICE

365 South Holland Drive • Pendergrass, GA 30567

(888) 795-0808 • (706) 693-2226 • Fax (706) 693-4400

WARRANTYMIRAFI® Construction Products assumes no liability for the accuracy or completeness of this information or for the ultimate use bythe purchaser. MIRAFI® disclaims any and all express, implied, or statutory standards, warranties or guarantees, including withoutlimitation any implied warranty as to merchantability or fitness for a particular purpose or arising from a course of dealing or usageof trade as to any equipment, materials, or information furnished herewith. This document should not be construed as engineer-ing advice.

Technical DataInnovative Geotextiles

Property / Test Method Unit 140N

MECHANICAL PROPERTIES

Grab Tensile StrengthASTM D 4632Strength @ Ultimate kN (lbs) 0.53 (120)Elongation @ Ultimate % 50Mullen Burst Strength kPa 1550ASTM D 3786 (psi) (225)Trapezoidal Tear Strength kN 0.22ASTM D 4355 (lbs) (50)Puncture Strength kN 0.30ASTM D 4833 (lbs) (65)UV Resistance after 500 hrs. % strength 70ASTM D 4355

HYDRAULIC PROPERTIES

Apparent Opening Size (AOS) US Sieve 70ASTM D 4751 mm 0.212

Permittivity sec-1 1.8ASTM D 4491

Flow Rate l/min/m2 5500ASTM D 4491 (gal/min/ft2) (135)

Packaging

Roll Width m(ft) 3.8 (12.5)4.5 (15.0)

Roll Length m(ft) 110 (360)

Est. Gross Weight kg(lbs) 74 (164)89 (197)

Area m2(yd2) 418 (500)502(600)

Property / Test Method Unit 500X

MECHANICAL PROPERTIES

Grab Tensile StrengthASTM D 4632Strength @ Ultimate kN (lbs) 0.90 (200)Elongation @ Ultimate % MD/ CD 15/ 10Mullen Burst Strength kPa 2756ASTM D 3786 (psi) (400)Trapezoidal Tear Strength kN 0.33ASTM D 4355 (lbs) (75)Puncture Strength kN 0.40ASTM D 4833 (lbs) (90)UV Resistance after 500 hrs. % strength 70ASTM D 4355

HYDRAULIC PROPERTIES

Apparent Opening Size (AOS) US Sieve 50ASTM D 4751 mm 0.30

Permittivity sec-1 0.05ASTM D 4491

Packaging

Roll Width m(ft) 3.8 (12.5)5.3 (17.5)

Roll Length m(ft) 132 (432)

94.2 (309)

Est. Gross Weight kg(lbs) 95 (210)

Area m2(yd2) 502 (600)

Mirafi® 500X for Interlocking Concrete

Paver Stabilization

Mirafi® 140N for Subsurface Drainage

VAPOR BLOCK VB6,VB10 & VB15

PRODUCT DESCRIPTION

PRODUCT USE

SIZE & PACKAGING

COMMON APPLICATIONS

Vapor Block™ is a high performance underslab vapor retarder designed to retard moisture migration through concrete slabs-on-grade. This product is made from state of the art polyethylene resins that provide superior physical and performance properties that far exceed ASTM E-1745 (Plastic Water Vapor Retarders Used in Contact with Soil or Granular Fill under Concrete Slabs) Class A, B, and C requirements. High tensile strength, unequaled puncture resistance, low moisture vapor permeability as well as resistance to decay make Vapor Block one of the most effective under-slab vapor retarders on the market today! Available in 6, 10 and 15 mil thickness to best meet required performance specifications.

Vapor Block impedes the transmission of water vapor from traveling upward through a concrete slab-on-grade or through a concrete wall when properly installed. It is extremely important to avoid puncturing a vapor retarder during installation to assure proper performance. Vapor Block’s puncture strength is second to none, withstanding even the most demanding installation conditions.

Vapor Block vapor retarders protect your flooring and other moisture sensitive furnishings in your building’s interior from moisture migration. Vapor Block vapor retarders can also greatly reduce condensation, mold and degradation by controlling water vapor migration.

Vapor Block 6 & 10 are available in 15’ wide rolls by 200’ long for ease of installation and maximum coverage. Vapor Block 15 is available in 12’ wide rolls by 200’ long. Other custom sizes are available depending upon size and volume requirements. All rolls are folded and rolled on heavy-duty cores for ease in handling and installation. Installation instructions and ASTM E-1745 classifications accompany each roll.

• Under-Slab Vapor Retarder• Radon Retarder

• Crawl Spaces • Foundation Wall Vapor Retarder

®

2067 Wineridge Pl. #F • Escondido, CA 92029

toll free (800) 747-6095 • local (760) 747-6095 • fax (760) 747-1920e-mail: [email protected]: www.americover.com

VAPOR BLOCK 6, 10 & 15

The test results listed above were provided by TRI/Environmental, Inc. of Austin, TX.

K Level and tamp or roll granular base.

L Unroll VAPOR BLOCK with the longest dimension parallel with the direction of the pour, and unfold.

M Lap VAPOR BLOCK over the footings, and seal to the vertical foundation walls with two-sided tape. Lap joints a minimum of 6 inches and seal overlap with Seaming Tape.

N Seal around sewer pipes, support columns or any other penetration with an elastomeric sealant to create a monolithic membrane between the surface of the slab and the slab perimeter from moisture sources below.

VAPOR BLOCK PLACEMENT

Note: To the best of our knowledge, these are typical property values and are intended as guides only, not as specification ®limits. AMERICOVER MAKES NO WARRANTIES AS TO THE FITNESS FOR A SPECIFIC USE OR MERCHANTABILITY

OF PRODUCTS REFERRED TO, no guarantee of satisfactory results from reliance upon contained information or recommendations and disclaims all liability for resulting loss or damage.

(These are very general installation instructions. Instructions on architectural or structural drawings should be reviewed & followed as well. Detailed installation instructions accompany each roll of VAPOR BLOCK. ASTM E 1643 also provides valuable installation information.)

PROPERTIES TEST METHOD VAPOR BLOCK 6 VAPOR BLOCK 10 VAPOR BLOCK 15

English Metric English Metric English Metric

THICKNESS, NOMINAL 6 mil 0.15 mm 10 mil 0.25 mm 15 mil 0.38 mm

WEIGHT PER MSF 29 lbs 13 kg 49 lbs. 22 kg 73 lbs. 33 kg

CLASSIFICATION ASTM E 1745 CLASS C CLASS A, B & C CLASS A, B & C

TENSILE STRENGTH Average MD & TD (New Material)

ASTM E 154 Section 9

30 lbs/in 130 N 52 lbs/in 230 N 77 lbs/in 340 N

TENSILE STRENGTH Average MD & TD (After Soak ing)


25 lbs/in 110 N 55 lbs/in 240 N 82 lbs/in 360 N

PUNCTURE RESISTANCE

ASTM D 1709 Method B

1500 g 2600 g 4000 g

MAXIMUM USE TEMPERATURE 180°F 82°C 180°F 82°C 180°F 82°C

MINIMUM USE TEMPERATURE -70°F -57°C -70°F -57°C -70°F -57°C

PERMEANCE (New Material)


ASTM E 96 Procedure B

.090

U.S. Perms

.060

Metric Perms

.036

U.S. Perms

.024

Metric Perms

.025

U.S. Perms

.016

Metric Perms

®

2067 Wineridge Pl. #F • Escondido, CA 92029

toll free (800) 747-6095 • local (760) 747-6095 • fax (760) 747-1920e-mail: [email protected]: www.americover.com

APPENDIX 3

APPENDIX 3

C-5

EN 404M & CP 404MSealed Regenerative Blower w/Explosion-Proof Motor

BLOWER PERFORMANCE AT STANDARD CONDITIONSAIR FLOW RATE (M3/MIN)

60

50

40

30

20

10

125

100

75

50

25

2.0

1.5

1.0

0.5

INC

HE

S O

F W

AT

ER

PS

IG

mB

AR

PRESSURE

0 20 40 60 80 100

AIR FLOW RATE (SCFM)1007550250

1500

1000

500

0

60

40

20

0

MO

TO

RW

IND

ING

TE

MP

RIS

E °

C

PO

WE

RIN

PU

TW

AT

TS

BL

OW

ER

AIR

TE

MP

RIS

E °

C

AIR FLOW RATE (M3/MIN)

-60

-50

-40

-30

-20

-10

125

100

75

50

25

4

3

2

1

INC

HE

S O

F W

AT

ER

INC

HE

S O

F M

ER

CU

RY

mB

AR

SUCTION

0 20 40 60 80 100

AIR FLOW RATE (SCFM)1007550250

1500

1000

500

0

60

40

20

0

MO

TO

RW

IND

ING

TE

MP

RIS

E °

C

PO

WE

RIN

PU

TW

AT

TS

BL

OW

ER

AIR

TE

MP

RIS

E °

C

0.5 1.0 1.5 2.0 2.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0

60 Hz

50 Hz

60 Hz

50 Hz

FEATURES• Manufactured in the USA – ISO 9001 compliant• Maximum flow: 107 SCFM• Maximum pressure: 57 IWG• Maximum vacuum: 52 IWG• Standard motor: 1.0 HP, explosion-proof• Cast aluminum blower housing, cover, impeller &

manifold; cast iron flanges (threaded); teflon lip seal• UL & CSA approved motor with permanently

sealed ball bearings for explosive gas atmospheres Class I Group D minimum

• Sealed blower assembly• Quiet operation within OSHA standards

MOTOR OPTIONS• International voltage & frequency (Hz)• Chemical duty, high efficiency, inverter duty

or industry-specific designs• Various horsepowers for application-specific needs

BLOWER OPTIONS• Corrosion resistant surface treatments & sealing options• Remote drive (motorless) models• Slip-on or face flanges for application-specific needs

ACCESSORIES (See Catalog Accessory Section)• Flowmeters reading in SCFM• Filters & moisture separators• Pressure gauges, vacuum gauges & relief valves• Switches – air flow, pressure, vacuum or temperature• External mufflers for additional silencing• Air knives (used on blow-off applications)• Variable frequency drive package

Rev. 2/04

AMETEK Technical and Industrial Products, Kent, OH 44240 • e mail: [email protected] • internet: www.ametektmd.com

ROTRON Regenerative Blowers

SectionC 2004.qxd 6/26/04 10:53 AM Page C-5

Scale CAD drawing available upon request.

1 Rotron motors are designed to handle a broad range of world voltages and power supply variations. Our dual voltage 3 phase motors arefactory tested and certified to operate on both: 208-230 /415-460 VAC-3 ph-60 Hz and 190-208/380-415 VAC-3 ph-50 Hz. Our dualvoltage 1 phase motors are factory tested and certified to operate on both: 104-115/208-230 VAC-1 ph-60 Hz and 100-110 /200-220VAC-1 ph-50 Hz. All voltages above can handle a ±10% voltage fluctuation. Special wound motors can be ordered for voltages outside ourcertified range.

2 Maximum operating temperature: Motor winding temperature (winding rise plus ambient) should not exceed 140°C for Class F rated motorsor 120°C for Class B rated motors. Blower outlet air temperature should not exceed 140°C (air temperature rise plus inlet temperature).Performance curve maximum pressure and suction points are based on a 40°C inlet and ambient temperature. Consult factory for inlet orambient temperatures above 40°C.

3 Maximum blower amps corresponds to the performance point at which the motor or blower temperature rise with a 40°C inlet and/orambient temperature reaches the maximum operating temperature.

Specifications subject to change without notice. Please consult your Local Field Sales Engineer for specification updates.

C-6

EN 404M & CP 404MSealed Regenerative Blower w/Explosion-Proof Motor

SPECIFICATIONS

MODEL EN404AR58ML EN404AR72ML CP404FQ58MLR CP404FQ72MLRPart No. 038173 038174 038080075173 038958Motor Enclosure – Shaft Material Explosion-proof – CS Explosion-proof – CS Chem XP – SS Chem XP – SSHorsepower 1.0 1.0Phase – Frequency 1 Single - 60 Hz Three - 60 HzVoltage 1 115 230 208-230 460Motor Nameplate Amps 11.4 5.69 3.5-3.2 1.6Max. Blower Amps 3 14.4 7.2 4.2 2.1Inrush Amps 72 36 20.2 10.1Starter Size 0 00 00 00Service Factor 1.0 1.0Thermal Protection 2 Class B - Automatic Class B - Pilot DutyXP Motor Class – Group I-D, II-F&G I-D, II-F&GShipping Weight 72 lb (33 kg) 65 lb (30 kg)

MODEL L (IN) ± .30 L (MM) ± 8

EN/CP404AR72ML 14.58 370.3

EN/CP404AR58ML 15.58 396 A 0.75" NPT CONDUIT CONNECTION AT 12 O’CLOCK POSITION

Same asEN404AR58ML –

038173except add

Chemical Processing(CP)

features from

cataloginside front coverer

Same asEN404AR72ML –

038174except add

Chemical Processing(CP)

features from

cataloginside front cover

DIMENSIONS: INMM

TOLERANCES: .XX ± .082.0

.XXX ± .030.800

(UNLESS OTHERWISE NOTED)

Rev. 2/04



SectionC 2004.qxd 6/26/04 10:53 AM Page C-6

G-8

Noise ReductionAccessories

Inlet/Outlet Muffler (Single Connection)Mufflers lower blower noise in areas where reduced sound levels are required.

SPECIFICATIONS:HOUSING – SteelMEDIA – Acoustical Material

Inline Muffler (Dual Connection)Inline Mufflers are utilized for noise reduction inapplications where piping systems are connected directlyto both ends of the muffler. Muffler may be used on inletor outlet of blower.

SPECIFICATIONS:HOUSING – SteelMEDIA – Acoustical Material

AMETEK Rotron Industrial Products strives to maintain acomplete inventory of accessories to complement theRotron Regenerative Product Line. If there is an Accessory

Product that is not listed in this Accessory Guide, please donot hesitate to contact AMETEK Rotron Industrial’s ApplicationEngineering Department directly with your requirements.

Reference Connection Dimensions (Inches)

Part Number Blower Model Inlet Outlet A B C550888 D 1.5 NPT-M 2.0 NPT-F 4.00 12.75 15.5522948 E 2.0 NPT-M 2.0 NPSC-F 4.00 15.75 18.45529900 E 2.00 NPSC-F 2.0 NPSC-F 4.38 15.75 18.45551377 E 2.00 NPT-M 2.00 NPT-M 4.00 15.75 18.15515185 F 2.50 NPT-M 2.50 NPT-F 6.12 11.75 16.12511569 G 3.00 NPT-M 3.0 NPT-F 7.00 18.00 22.25515210 G 4.00 NPT-M 4.0 NPT-F 10.00 24.00 30.00551565 G 4.00 NPT-M 4.0 NPT-M 10.00 24.00 30.00516264 H 4.00 NPT-M 4.0 NPT-F 8.00 22.00 27.75516265 H 6.00 NPT-M 6.0 NPT-F 12.00 30.00 36.75

Reference Connection Dimensions (Inches)

Part Number Blower Model Inlet A B C D523627 B 1.0 NPT Male 4.00 10.93 13.98 1.00516838 B 1.0 SO Slip on 1.90 5.16 6.23 1.00523626 C 1.25 NPT Male 4.00 10.93 14.07 1.25523625 D 1.50 NPT Male 4.00 10.93 14.57 1.50523624 E 2.00 NPT Male 4.00 10.93 12.16 2.00523623 E 2.00 NPSC Female 4.00 10.93 12.43 2.00523622 E 2.00 NPT Male 4.00 15.75 16.95 2.00

Blower Model Reference KeyA = SPIRAL E = DR/EN/CP 656, 6, 623, S7B = DR/EN/CP 068, 083, 101, 202 F = DR/EN/CP 707, 808, 858, S9, P9 (Inlet Only)C = DR/EN/CP 303, 312, 313, 353 G = DR/EN/CP 823, S13, P13 (Inlet Only)D = DR/EN/CP 404, 454, 513, 505, 555, 523 H = DR/EN/CP 909, 979, 1223, 14, S15, P15 (Inlet Only)

Rev. 2/04



SectionG 2004.qxd 6/26/04 12:19 PM Page G-8

APPENDIX 4

APPENDIX 4

Notice to City of Burlington Land Records – 3/14/08 This is to serve notice to the City of Burlington, Vermont, that at the property located at 0 King Street (King Street Ferry Dock) , currently owned by Lake Champlain Transportation soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 311876720765; and Map Lot Identification Number 049-1-078-000. The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, soil contamination is present in the area between King Street and Maple Street of the property, from approximately 4 feet to 24 feet below grade, at concentrations from 5 to 65 µg/Kg (Tetrachloroethene) and from 20 to 100 µg/Kg (Trichloroethene). On this property, groundwater contamination is present at approximately 5 feet below grade, at concentrations from 3 to 15 µg/L (Tetrachloroethene) and from 8 to 12 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, excavation, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.

For further information contact:

Vermont Agency of Natural Resources Department of Environmental Conservation

Waste Management Division, Sites Management Section 103 South Main Street / West Building

Waterbury, VT 05671-0404 Tel: (802) 241-3888

U:\PROJECTS\Hinsdale OFF-PROP 151 SoChampl\Notices to Land Records\Site Specific Notices 2008\Notice Land Records 0 King Street 3-13-08.doc

Notice to City of Burlington Land Records – 3/14/08 This is to serve notice to the City of Burlington, Vermont, that at the property located at 0 King Street (Railroad Tracks and Bike Path) , currently owned by the State of Vermont - Railroad, soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 311980720799; and Map Lot Identification Number 049-1-077-000. The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, soil contamination is present in the area between King Street and Maple Street of the property, from approximately 4 feet to 24 feet below grade, at concentrations from 5 to 65 µg/Kg (Tetrachloroethene) and from 20 to 100 µg/Kg (Trichloroethene). On this property, groundwater contamination is present at approximately 5 feet below grade, at concentrations from 3 to 15 µg/L (Tetrachloroethene) and from 8 to 12 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, excavation, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.




Waterbury, VT 05671-0404 Tel: (802) 241-3888

U:\PROJECTS\Hinsdale OFF-PROP 151 SoChampl\Notices to Land Records\Site Specific Notices 2008\Notice Land Records Bike Path_RR 3-13-08.doc

Notice to City of Burlington Land Records This is to serve notice to the City of Burlington, Vermont, that at the property located at 181 Battery Street, currently owner by Lowell Spillane, soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 312215720415; and Map Lot Identification Number 049-1-076-000. The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, soil contamination is present across the entire property, from 16 feet to 24 feet below grade, at concentrations from less than 5 to 49.8 µg/Kg (Tetrachloroethene) and from less than 5 to 19.7 µg/Kg (Trichloroethene). On this property, groundwater contamination is present at approximately 8 to 13 feet below grade, at concentrations from 10 to 15 µg/L (Tetrachloroethene) and from 7 to 17 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, excavation beyond 10 feet below grade, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.




Waterbury, VT 05671-0404 Tel: (802) 241-3888

[U:\PROJECTS\Hinsdale OFF-PROP 151 SoChampl\Notices to Land Records\Site Specific Notices 2008\Notice Land Records 181 Battery Street 3-13-08.doc

Notice to City of Burlington Land Records – 3/14/08 This is to serve notice to the City of Burlington, Vermont, that at the property located at 174 Battery Street, currently owned by Ten and Two Trust, soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 312417720582; and Map Lot Identification Number 049-1-094-000. The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, soil contamination is present across the entire property, from 12 feet to 24 feet below grade, at concentrations from 10.8 to 289 µg/Kg (Tetrachloroethene) and from 6.7 to 119 µg/Kg (Trichloroethene). On this property, groundwater contamination is present at approximately 14 feet below grade, at concentrations from 25 µg/L (Tetrachloroethene) to 21 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, excavation beyond 10 feet below grade, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.




Waterbury, VT 05671-0404 Tel: (802) 241-3888

U:\PROJECTS\Hinsdale OFF-PROP 151 SoChampl\Notices to Land Records\Site Specific Notices 2008\Notice Land Records 174 Battery Street 3-13-08.doc

Notice to City of Burlington Land Records – 3/14/08 This is to serve notice to the City of Burlington, Vermont, that at the property located at 171 Battery Street, currently owned by N V Tarwood, soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 312203720647; and Map Lot Identification Number 049-1-079-000. The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, soil contamination is present across the southern two-thirds of the property, from 16 feet to 24 feet below grade, at concentrations from 7.0 to 625 µg/Kg (Tetrachloroethene) and from 6.7 to 133 µg/Kg (Trichloroethene). On this property, groundwater contamination is present from approximately 5 to 17 feet below grade, at concentrations from 15 to 22 µg/L (Tetrachloroethene) and 1.8 to 7.8 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, excavation beyond 10 feet below grade, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.




Waterbury, VT 05671-0404 Tel: (802) 241-3888


Notice to City of Burlington Land Records – 3/14/08 This is to serve notice to the City of Burlington, Vermont, that at the property located at 168 Battery Street, currently owned by Marbryk Limited Partnership, soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 312441720642; and Map Lot Identification Number 049-1-093-000. The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, soil contamination is present across the entire property, from 16 feet to 24 feet below grade, at concentrations less than 14 µg/Kg (Tetrachloroethene) and less than 14 µg/Kg (Trichloroethene). On this property, groundwater contamination is present from approximately 14 to 16 feet below grade, at concentrations less than 50 µg/L (Tetrachloroethene) to less than 50 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, excavation beyond 10 feet below grade, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.




Waterbury, VT 05671-0404 Tel: (802) 241-3888


Notice to City of Burlington Land Records – 3/14/08 This is to serve notice to the City of Burlington, Vermont, that at the property located at 166 Battery Street, currently owned by Pomeroy Associates, LLC, soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 312434720689; and Map Lot Identification Number 049-1-092-000. The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, soil contamination is present across the entire property, from 16 feet to 24 feet below grade, at concentrations less than 14 µg/Kg (Tetrachloroethene) and less than 14 µg/Kg (Trichloroethene). On this property, groundwater contamination is present from approximately 14 to 16 feet below grade, at concentrations less than 50 µg/L (Tetrachloroethene) to less than 50 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, excavation beyond 10 feet below grade, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.




Waterbury, VT 05671-0404 Tel: (802) 241-3888


Notice to City of Burlington Land Records – 3/14/08 This is to serve notice to the City of Burlington, Vermont, that at the property located at 162 Battery Street, currently owned by Angus Property Management, soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 312438720727; and Map Lot Identification Number 049-1-091-000. The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, soil contamination is present across the entire property, from approximately 16 feet to 24 feet below grade, at concentrations from 14 to 76.3 µg/Kg (Tetrachloroethene) and from less than 5 to 30.7 µg/Kg (Trichloroethene). On this property, groundwater contamination is present at approximately 16 feet below grade, at concentrations from approximately 100 µg/L (Tetrachloroethene) to approximately less than 50 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, excavation beyond 10 feet below grade, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.




Waterbury, VT 05671-0404 Tel: (802) 241-3888


Notice to City of Burlington Land Records – 3/14/08 This is to serve notice to the City of Burlington, Vermont, that at the property located at 156 Battery Street, currently owned by Champlain Commercial Property Investment Group, LLC, soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 312411720770; and Map Lot Identification Number 049-1-090-000. The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, soil contamination is present across the entire property, from approximately 16 feet to 24 feet below grade, at concentrations from 14.1 to 300 µg/Kg (Tetrachloroethene) and from 7.6 to 64.4 µg/Kg (Trichloroethene). On this property, groundwater contamination is present at approximately 16 feet below grade, at concentrations from 280 µg/L (Tetrachloroethene) to less than 50 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, excavation beyond 10 feet below grade, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.




Waterbury, VT 05671-0404 Tel: (802) 241-3888


Notice to City of Burlington Land Records – 3/14/08 This is to serve notice to the City of Burlington, Vermont, that at the property located at 152 Battery Street, currently owned by Champlain Commercial Property Investment Group, LLC, soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 312380720807; and Map Lot Identification Number 049-089-000. The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, soil contamination is present across the southern region, from approximately 16 feet to 24 feet below grade, at concentrations no greater than 15 µg/Kg (Tetrachloroethene) and no greater than 18 µg/Kg (Trichloroethene). On this property, groundwater contamination is present from approximately 16.5 feet to 17 feet below grade, at concentrations less than 50 µg/L (Tetrachloroethene) and less than 50 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, excavation beyond 10 feet below grade, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.




Waterbury, VT 05671-0404 Tel: (802) 241-3888


Notice to City of Burlington Land Records – 3/14/08 This is to serve notice to the City of Burlington, Vermont, that at the property located at 151 South Champlain Street, currently owned by Clark Hinsdale Jr., soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 312647720763; and Map Lot Identification Number 049-1-005-000. The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, soil contamination is present across the entire limits of the property, from approximately 0 feet to 24 feet below grade, at concentrations from 5.3 to 11,700 µg/Kg (Tetrachloroethene) and from 25.1 to 2,090 µg/Kg (Trichloroethene). On this property, groundwater contamination is present from approximately 14 feet to 15 feet below grade, at concentrations from 4.2 to 2,400 µg/L (Tetrachloroethene) and from <1.0 to <50 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, any excavation, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.




Waterbury, VT 05671-0404 Tel: (802) 241-3888

U:\PROJECTS\Hinsdale OFF-PROP 151 SoChampl\Notices to Land Records\Site Specific Notices 2008\Notice Land Records 151 South Champlain 3-13-08.doc

Notice to City of Burlington Land Records – 3/14/08 This is to serve notice to the City of Burlington, Vermont, that at the property located at 53 Main Street, currently owned by David Ackerman, soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 312567720756; and Map Lot Identification Number 049-1-117-000. The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, soil contamination is present in the southern region of the property, from approximately 12 feet to 24 feet below grade, at concentrations from 10 to 50 µg/Kg (Tetrachloroethene) and from 5 to 40 µg/Kg (Trichloroethene). On this property, groundwater contamination is present from approximately 13 feet to 16 feet below grade, at concentrations from 50 to 1,000 µg/L (Tetrachloroethene) and less than 1 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, excavation deeper than 10 feet, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.




Waterbury, VT 05671-0404 Tel: (802) 241-3888

U:\PROJECTS\Hinsdale OFF-PROP 151 SoChampl\Notices to Land Records\Site Specific Notices 2008\Notice Land Records 51-53 Main Street 3-13-08.doc

Notice to City of Burlington Land Records – 3/14/08 This is to serve notice to the City of Burlington, Vermont, that at the property located at 31 – 35 Main Street currently owned by Robert Marcellino, soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 312426720838 ; and Map Lot Identification Number 049-1-118-001. The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, the likely presence of soil contamination has been predicted in the southern region of the property, from approximately 12 feet to 24 feet below grade, at concentrations estimated to be 20 µg/Kg (Tetrachloroethene) and 10 µg/Kg (Trichloroethene). On this property, groundwater contamination is predicted to be present from approximately 13 feet to 16 feet below grade, at concentrations from 10 to 20 µg/L (Tetrachloroethene) and less than 5 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, excavation deeper than 10 feet, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.




Waterbury, VT 05671-0404 Tel: (802) 241-3888

U:\PROJECTS\Hinsdale OFF-PROP 151 SoChampl\Notices to Land Records\Site Specific Notices 2008\Notice Land Records 31-35 Main Street 3-13-08.doc

Notice to City of Burlington Land Records – 3/14/08 This is to serve notice to the City of Burlington, Vermont, that at the property located at 22 – 26 King Street currently owned by Lawlor Wakem, soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 312495720588; and Map Lot Identification Number 049-1-002-000. The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, soil contamination is present throughout the property, from approximately 12 feet to 24 feet below grade, at concentrations from 10 to 25 µg/Kg (Tetrachloroethene) and from 5 to 15 µg/Kg (Trichloroethene). On this property, groundwater contamination is present from approximately 12 feet to 18 feet below grade, at concentrations from 20 to 25 µg/L (Tetrachloroethene) and from 10 to 25 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, excavation deeper than 10 feet, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.




Waterbury, VT 05671-0404 Tel: (802) 241-3888

U:\PROJECTS\Hinsdale OFF-PROP 151 SoChampl\Notices to Land Records\Site Specific Notices 2008\Notice Land Records 22-26 King Street 3-13-08.doc

Notice to City of Burlington Land Records - 3/14/08 This is to serve notice to the City of Burlington, Vermont, that at the property located at 1 Steele Street, currently owned by Main Street Landing Company soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 312040720934 ; and Map Lot Identification Number 049-1-080-000 . The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, soil contamination is present in the southern region of the property, from approximately 4 feet to 12 feet below grade, at concentrations from 35 to 45 µg/Kg (Tetrachloroethene) and from 8 to 20 µg/Kg (Trichloroethene). On this property, groundwater contamination is present at approximately 5 feet below grade, at a concentration of 15 µg/L (Tetrachloroethene) and at 8 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, excavation, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.




Waterbury, VT 05671-0404 Tel: (802) 241-3888

U:\PROJECTS\Hinsdale OFF-PROP 151 SoChampl\Notices to Land Records\Site Specific Notices 2008\Notice Land Records 1 Steele Street 3-13-08.doc

Notice to City of Burlington Land Records – 3/14/08 This is to serve notice to the City of Burlington, Vermont, that at the property located at 187 Battery Street, currently owned by Stone Store Holdings, LLC, soils and groundwater are impacted by an unknown volume of chlorinated solvents (Tetrachloroethene, Trichloroethene). This property is further described in City records with the Parcel Identification Number 312567720756 ; and Map Lot Identification Number 049-1-117-000 . The Vermont Waste Management Division, Sites Management Section (SMS) is tracking the contamination as SMS Site #2003-3098. On this property, soil contamination is present in the northern portion of the property, from approximately 16 feet to 32 feet below grade, at concentrations from 20 to 35 µg/Kg (Tetrachloroethene) and from 6 to 20 µg/Kg (Trichloroethene). On this property, groundwater contamination is present from approximately 5 feet to 13 feet below grade, at a concentration of 3 µg/L (Tetrachloroethene) and from 10 to 17 µg/L (Trichloroethene). Details are outlined in the report titled Phase II Supplemental Subsurface Investigation Report, by Lincoln Applied Geology, Inc., dated December 2, 2005. The Heindel and Noyes, Corrective Action Plan dated September 13, 2007 addresses this contamination and explains the SMS-required and approved monitoring and/or mitigation required on-site. Copies of these reports are in the site file (SMS 2003-3098) and are available for review at the Vermont Department of Environmental Conservation offices in Waterbury, Vermont. Prior to any subsurface work, excavation deeper than 5 feet, or groundwater extraction on this property, the Sites Management Section (SMS), of the Agency of Natural Resources, Department of Environmental Conservation, Waste Management Division must be notified. This deed notice may only be updated or altered by the SMS. When conditions warrant, SMS may issue a new notice superseding this deed notice.




Waterbury, VT 05671-0404 Tel: (802) 241-3888

U:\PROJECTS\Hinsdale OFF-PROP 151 SoChampl\Notices to Land Records\Site Specific Notices 2008\Notice to Land Records 187 Battery Street 3-13-08.doc

APPENDIX 5

APPENDIX 5

Potential Subcontractors Glenn Peck Electric Middlebury, Vermont 05753 802-388-2618 Endyne, Inc. Laboratory Williston, Vermont 05495 802-879-4333 Green Mountain Laboratories, Inc. Montpelier, VT 05602 802-262-2004 Environmental Products & Services of Vermont P.O. Box 4620 Burlington, Vermont 05401 802-862-1212 APT Environmental 44 Woodcrest Ave. Milton, Vermont 05468 893-8281 F:\CLIENTS\2005\05041\Corrective Action Plan\Contractors List.doc

APPENDIX 6

APPENDIX 6

151 SOUTH CHAMPLAIN STREET Burlington, Vermont ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀

SITE SAFETY PLAN July 25, 2007 HEINDEL AND NOYES Consulting Hydrogeologists, Engineers, and Environmental Scientists

151 South Champlain Street SITE SAFETY PLAN This Site Safety Plan has been prepared to provide maximum protection to workers without significantly compromising the progress of the project. The Plan is only of value if read, understood, and adhered to by all affected personnel. By signing this document, the reader acknowledges that all pages of the text are present, have been read, understood, and will be adhered to during operations at 151 South Champlain Street in Burlington, Vermont. Heindel and Noyes assumes that the reader will also adhere to all OSHA General Industry Standards. This health and safety plan governs the operations of Heindel and Noyes employees. It does not extend to any contractors working under our supervision. We assume that all contractors have their own health and safety plan and that they are fully and completely OSHA certified for the position they are working in. We offer a copy of our health and safety plan so that the vendors can have the general knowledge of the conditions on the property as we know them and which guide our personnel site operations. Any questions about this plan should be directed to Jeff Noyes at Heindel & Noyes. This document provides a general Health and Safety Plan for responding to hazardous chemical releases. The plan is not all inclusive and should only be used as a guide, not a standard.1 A. GENERAL SITE INFORMATION

Start Date: Summer 2007 Location: 151 South Champlain Street and vacinity Hazards: Tetrachloroethene, Trichloroethylene mechanical

equipment, heat, and utilities Area Affected: Immediate vicinity only. Surrounding Population: Residential/Commercial/Undeveloped Topography: Sloping West Weather Conditions: Forecasted hot and humid, possible thunderstorms

1 Plan patterned after document developed by the U.S. Coast Guard.

151 SOUTH CHAMPLAIN STREET SITE SAFETY PLAN 2

H&N

B. OBJECTIVE The objective of this project is to install several sub slab soil gas extraction systems, soil gas monitoring points, indoor air sample collection and ground water sampling in accordance with the July 25, 2007 Corrective Action Plan. The H&N site inspector/engineer shall be responsible for health and safety monitoring during all work performed by H&N. C. ONSITE ORGANIZATION AND COORDINATION The following personnel are designated to carry out the stated job functions onsite. (Note: One person may carry out more than one job function.)

Project Supervisor/Engineer: Steven LaRosa, H&N Site Inspector/Safety Officer: Wendy Shellito, H&N Client contact: Rebecca Lemire, Hinsdale Properties

In the event that contamination is encountered and an exclusion zone is established, all personnel arriving or departing the work site will log in and out with the Site Inspector/Safety Officer. All activities onsite must be cleared through the Site Safety Officer. D. ONSITE CONTROL Heindel and Noyes has been designated to coordinate access control and security at the drilling site. A safe perimeter will be established at the boundary of the work area. No unauthorized personnel will be allowed access to the work area. Visitors must check in with the Project Supervisor or H&N onsite inspector. Where necessary, work area boundaries shall be identified by flagging/caution tape supported by steel rods, wooden stakes or other suitable barriers.


H&N

Absolutely no smoking within 50 feet of the work area. No confined space entry will be permitted without authorization of H&N site inspector. Any confined space entry must be supervised/monitored by the buddy system. Only OSHA-certified hazardous operations personnel should be permitted to physically handle or sample hazardous or contaminated materials. Pursuant to 29 CFR 1910.120 (the OSHA standard for hazardous waste operations), an uncontrolled release site should be properly marked to delineate the following site safety zones: The Exclusion Zone is defined as the immediate vicinity surrounding an excavation where hazardous materials are encountered. The Contaminant Reduction Zone is defined as the area designated by the Safety Officer for the decontamination of tools and PPE. The Contaminant Reduction Zone is located between the Exclusion Zone and the Support Zone. The Support Zone is defined as those portions of the site where no personnel or equipment having contact with hazardous materials may enter without decontamination. This will be the primary assembly point in the event of an emergency. Alternate assembly areas may be chosen at the discretion of the Site Safety Officer. E. HAZARD EVALUATION

(1) Known Hazards

The following substances are known or suspected to be onsite. The primary hazards are identified.

Substances Involved: Tetrachloroethene (PCE)

Concentrations (if known): Varianle


H&N

Primary Hazards: Inhalation, ingestion, dermal contact (skin and eyes)

Exposure Limits: PCE: TWA 25 ppm Gasoline = 1 ppm

STEL 200 ppm Gasoline = 5 ppm Prevent skin contact, prevent eye contact, wash

skin when contaminated, eyewash/ quick drench

The following additional hazards are expected onsite:

Χ mechanical equipment, Χ possible underground utilities, and Χ heat

(2) Action Levels

Photoionizing Detector:

Type: MicroTip w/10.6 eV lamp or H-Nu with 10.2 eV lamp Calibration: Isobutylene (sustained organic levels):

0 - 5 ppm Level D 5 - 50 ppm Notify Health & Safety Officer, may

require upgrade to Level C >50 ppm Interrupt task/evacuate/irrigate with

fresh air Reassess conditions

(3) Other Potential Health and Safety Hazards (mark if applicable)

X Heat (high ambient temp.) X Heavy equipment Cold X Physical injury and trauma

resulting from moving machinery

X Noise X General construction


H&N

Oxygen depletion X Physical injury and trauma Asphyxiation X Electrical hazards X Excavation Confined space entry Cave-ins Explosions X Falls, trips, slipping Other (Specify): X Handling and transfer of

petroleum products X Fire

F. PERSONAL PROTECTIVE EQUIPMENT Based on evaluation of potential hazards, the following levels of personal protection have been designated for the applicable work areas or tasks:

Location Job Function Level of Protection*

Exclusion Zone All workers Level D Contamination All workers Level D Reduction Zone

* To be determined onsite by the H&N Project Supervisor or Field Team Inspector. Levels of protection may be upgraded at any time, depending on actual site conditions. Specific protective equipment for each level of protection is as follows: Level A: Fully-encapsulating suit Level C: Rain suit

SCBA Full-face canister resp. Disposable coveralls Gloves

Over-boots Level B: Splash gear Level D: Hard hat

SCBA Work boots Over-boots Eye protection


H&N

If air-purifying respirators are required, organic vapor is the appropriate canister for use with the involved substances and concentrations. NO CHANGES TO THE SPECIFIED LEVELS OF PROTECTION SHALL BE MADE WITHOUT THE APPROVAL OF THE SITE SAFETY OFFICER AND THE PROJECT TEAM LEADER. G. ONSITE WORK PLANS

The work party, consisting of the H&N field inspector and designated subcontractors shall perform the work described in the July 25, 2007 Corrective Action Plan. Building specific exclusion zones and safety concerns will be addressed daily prior to initiating work. Close coordination with the building owner and tenants is essential to assure they are not exposed to sub-surface contaminants.

The work party will be briefed on the contents of this plan prior to initiating any excavation or other work involving potential exposure to hazardous materials at the site.

H. COMMUNICATION PROCEDURES Three (3) horn blasts is the emergency signal to indicate that all personnel should leave the Exclusion Zone. The following standard hand signals will be used:

Hand gripping throat -- Out of air, can't breathe

Grip partner's wrist or -- Leave area immediately both hands around waist

Hands on top of head -- Need assistance

Thumbs up -- OK, I am all right, I understand

Thumbs down -- No, negative


H&N

I. DECONTAMINATION PROCEDURES Decontamination procedures will be required for all personnel receiving direct exposure to contaminated materials. Decontamination will consist of removing all outer protective clothing and steam-cleaning of all contaminated equipment. Protective clothing and hand tools will be scrub-brush cleaned with a Liquinox/water solution, followed by a clean water rinse. J. SITE SAFETY AND HEALTH PLAN

(1) The onsite H&N inspector is the designated Site Safety Officer and is directly responsible for site health and safety monitoring. All site contractors are responsible for maintaining safe work practices during the course of this project.

(2) Emergency Medical Care: The closest hospital to the work site is the Fletcher

Allen Hospital in Burlington, Vermont (phone: 656-4285). For emergency services (police, fire and ambulance) dial 911

First aid equipment will be available onsite at the H&N field team member's vehicle.

Emergency medical information for substances present:

Substance: PCE Exposure Symptoms: Dizziness, headache, irritable eyes,

nose, throat, nausea First-aid Instructions: Wash promptly, respiratory

support or professional medical attention if needed

List of emergency phone numbers:

Police: 911 Fire: 911


H&N

Hospital: 911 Ambulance: 911 Poison Control Center:1-800-562-8236 (toll free call)

(3) Environmental Monitoring

The following environmental monitoring instruments shall be used onsite.

MicroTip Photoionization Detector (PID), or Hnu PID.

(4) Emergency Procedures (should be modified as required for incident):

The following standard emergency procedures will be used by onsite personnel. The Site Safety Officer shall be notified of any onsite emergencies and be responsible for ensuring that the appropriate procedures are followed.

Personnel Injury in the Exclusion Zone:

Upon notification of any injury in the Exclusion Zone, the designated emergency signal three (3) horn blasts shall be sounded. All site personnel shall assemble at the decontamination line. The rescue team will enter the Exclusion Zone (if required) to remove the injured person to the hotline. The rescue personnel and injured person should be decontaminated to the extent possible prior to movement to the Support Zone. The onsite EMT shall initiate the appropriate first aid, and contact should be made for an ambulance and with the designated medical facility (if required). No persons shall re-enter the Exclusion Zone until the cause of the injury or symptoms is determined.

Personnel Injury in the Support Zone:

Upon notification of an injury in the Support Zone, the Project Team Leader and Site Safety Officer will assess the nature of the injury. If the cause of the injury or loss of the injured person does not affect the performance of site personnel, operations may continue, with the onsite EMT initiating the appropriate first aid and necessary follow-up as stated above. If the injury increases the risk to others, the designated emergency signal three (3) horn blasts shall be sounded and all site


H&N

personnel shall move to the decontamination line for further instructions. Activities onsite will stop until the added risk is removed or minimized.

Fire/Explosion:

Upon notification of a fire or explosion onsite, the designated emergency signal three (3) horn blasts shall be sounded and all site personnel assembled at the decontamination line. The fire department shall be alerted and all personnel moved to a safe distance from the involved area. Small fires will be fought with hand-held extinguishers.

Personnel Protective Equipment Failure:

If any site worker experiences a failure or alteration of protective equipment that affects the protection factor, that person and his/her buddy shall immediately leave the Exclusion Zone. Re-entry shall not be permitted until the equipment has been repaired or replaced.

Other Equipment Failure:

If any other equipment onsite fails to operate properly, the Project Team Leader and Site Safety Officer shall be notified and then determine the effect of this failure on continuing operations onsite. If the failure affects the safety of personnel shall leave the Exclusion Zone until the situation is evaluation and appropriate actions taken.

The following emergency escape routes are designated for use in those situations where egress from the Exclusion Zone cannot occur through the decontamination line: Any safe direction away from danger. Reassemble at support zone. Evacuation rally point to be determined by Site Safety Office at start of each day and updated depending on site conditions.

In all situations, when an onsite emergency results in evacuation of the Exclusion Zone, personnel shall not re-enter until:

(1) The conditions resulting in the emergency have been corrected. (2) The hazards have been reassessed.


H&N

(3) The Site Safety Plan has been reviewed. (4) Site personnel have been briefed on any changes in the Site Safety Plan.

All site personnel have read the above plan, pages 1-11 inclusive, and are familiar with its provisions. This health and safety plan governs the operations of Heindel and Noyes employees. It does not extend to any contractors working under our supervision. We assume that all contractors have their own health and safety plan and that they are fully and completely OSHA certified for the position they are working in. We offer a copy of our health and safety plan so that the vendors can have the general knowledge of the conditions on the property as we know them and which guide our personnel site operations. ________________________________________ _______________________________________ Steven LaRosa (H&N Project Manager) Jeffrey Noyes (H&N Principal Officer) _________________________________________ _______________________________________ Representative, ________________ Signature Print Name ________________________________________ _______________________________________ Print Name Signature _________________________________________ Representing ________________________________________ _______________________________________ Print Name Signature _________________________________________ Representing ________________________________________ _______________________________________ Print Name Signature _________________________________________ Representing ________________________________________ _______________________________________ Print Name Signature


H&N

_________________________________________ Representing ________________________________________ _______________________________________ Print Name Signature _________________________________________ Representing U:\PROJECTS\HINSDALE OFF-PROP 151 SOCHAMPL\CAP\H&SAFPLN.DOC


H&N

EMERGENCY PHONE NUMBERS VERMONT POISON CENTER:....................................................................... 658-3456 FLETCHER ALLEN HOSPITAL: ...................................................................... 656-4285 FIRE AND AMBULANCE SERVICE:......................................................................... 911 POLICE: .................................................................................................................... 911 U.S. COAST GUARD, BOSTON, MA OFFICE: ....................................... 617-565-9000 VERMONT DEPARTMENT OF ENVIRONMENTAL CONSERVATION

Spill Response:.................................... 241-3888 Sites Management Section:................. 241-3888

HEINDEL AND NOYES:.................................................................................. 658-0820 TOWN OF BURLINGTON PUBLIC WORKS .................................................... 863-9094

APPENDIX 7

APPENDIX 7

Hinsdale PropertiesRevised Corrective Action Plan

Burlington, VermontScope of Services/Cost Estimate

December 19, 2008

Task Item Number Units Unit Rate Fees

Phase I - Vapor Mitigation and Monitoring System Installations

Task I - Blinn House Vapor Mitigation System Installation

System InstallationField Technician II - 40 hr(s) @ $45.00 1,800.00$ Field Technician II - 40 hr(s) @ $45.00 1,800.00$

Health and Safety Monitoring Equipment - 5 day(s) @ $80.00 400.00$ Extraction Point Materials - 4 point(s) @ $150.00 600.00$

Electrical Installation - $1,000.00 1,000.00$ Piping and Fittings - $1,500.00 1,500.00$

System ComponentsVacuum Blower - $1,000.00 1,000.00$

Vapor Carbon Canister AC-1 - 1 @ $650.00 650.00$

Building Modification $2,000.00 2,000.00$ subtotal 10,750.00$

Task II - Downgradient Building Vapor Mitigation System Installations156, 162, 164 Battery Street Properties

Property Owner Coordination and System InstallationSenior Project Manager - 20 hr(s) @ $76.50 1,530.00$

Field Technician II - 30 hr(s) @ $45.00 1,350.00$ Field Technician II - 30 hr(s) @ $45.00 1,350.00$

Health and Safety Monitoring Equipment - 3 day(s) @ $80.00 240.00$ Extraction Point Materials - 4 well(s) @ $150.00 600.00$

Electrical Installation - $1,000.00 1,000.00$ Piping and Fittings - $1,500.00 1,500.00$

System ComponentsVacuum Fan Assembly - $500.00 500.00$

Building Modification $1,500.00 1,500.00$

subtotal per building 9,570.00$ subtotal 28,710.00$

Fan, Enclosure, Muffler, Condensate Trap, Alarm, Gage

The following cost estimate is based on the tasks described in the H&N Revised Corrective Action Plan (CAP) dated December 19, 2008. Details of each task are included in the CAP and are not repeated here.

Heindel & Noyes, Inc. P.O. Box 4503 Burlington, VT 05406-4503

§ Consulting Hydrogeologists § Engineers § Environmental Scientists

Voice 802-658-0820/Fax 802-860-1014

U:\PROJECTS\COSTEST\Cost Estimate for CAP Ver 8 LF.xls 12/19/2008



December 19, 2008



Voice 802-658-0820/Fax 802-860-1014

Phase I (cont)Task III - Sub Slab Vapor Monitoring Point Installation

40 King Street, 168 Battery Street and 174 Battery Street

Property Owner Coordination Monitoring Point InstallationSenior Project Manager - 5 hr(s) @ $76.50 382.50$

Field Technician II - 8 hr(s) @ $45.00 360.00$ Health and SafetyMonitoring Equipment - 1 day(s) @ $80.00 80.00$

Extraction Point Materials - 4 point(s) @ $25.00 100.00$

subtotal per building 922.50$ subtotal 2,767.50$

Task IV - Deed Notices

Legal Fees - $1,000.00 1,000.00$

subtotal per property (18 total) 1,000.00$ subtotal 18,000.00$

Task V - Additional Subsurface Investigation

Property Owner Coordination Senior Project Manager - 10 hr(s) @ $76.50 765.00$

Field Technician II - 20 hr(s) @ $45.00 900.00$

Boring InstallationsSenior Project Manager - 10 hr(s) @ $76.50 765.00$

Field Technician II - 40 hr(s) @ $45.00 1,800.00$ Field GC Operator - 40 hr(s) @ $54.00 2,160.00$

Field GC - 4 day(s) @ $135.00 540.00$ Field GC Screen - 70 sample(s) @ $32.00 2,240.00$

Health and Safety Monitoring Equipment - 4 day(s) @ $80.00 320.00$ Drilling Subcontractor - 4 day(s) @ $1,200.00 4,800.00$

Driller Mobe/Demobe 1 $150.00 150.00$ Soil Gas, Soil Sampling Supplies 7 boring(s) @ $75.00 525.00$

Groundwater Monitoring Materials 7 well(s) @ $120.00 840.00$ Samples, EPA TO1/TO2 (Soil Gas) - 7 sample(s) @ $200.00 1,400.00$ Samples, EPA Method 8260 (Soil) - 7 sample(s) @ $185.00 1,295.00$

Waste Disposal - 2 drum(s) @ $300.00 600.00$

Groundwater SamplingSenior Project Manager - 1 hr(s) @ $76.50 76.50$

Field Technician II - 10 hr(s) @ $45.00 450.00$ Interface Probe - 1 day(s) @ $47.00 47.00$

Low flow Sampling Equipment - 1 day(s) @ $150.00 150.00$ Generator - 1 day(s) @ $75.00 75.00$

Samples, EPA Method 8260 (Water) - 8 sample(s) @ $185.00 1,480.00$ Waste Disposal - 1 drum(s) @ $300.00 300.00$

Site SurveySurvey Technician - 8 hr(s) @ $54.00 432.00$ Field Technician II - 8 hr(s) @ $45.00 360.00$ Survey Equipment - 1 day(s) @ $80.00 80.00$

ReportingSenior Project Manager - 24 hr(s) @ $76.50 1,836.00$

CAD/GIS - 4 hr(s) @ $50.00 200.00$ Administrative Assistant - 4 hr(s) @ $31.50 126.00$

subtotal 24,712.50$




December 19, 2008



Voice 802-658-0820/Fax 802-860-1014

Phase I (cont)Weekly Updates to Client

Senior Project Manager - 1 hr(s) @ $76.50 38.25$

subtotal (12 weeks) 459.00$ subtotal 459.00$

SUBTOTAL PHASE I 85,399.00$

Task I - Blinn HouseElectric Consumption

One Horsepower Blower (1kW/hr) - 13176 kWhr.(s) $0.15 1,976.40$

Carbon ConsumptionVapor Carbon Canister AC-1 - 4 @ $650.00 2,600.00$

Carbon Disposal - 4.0 drum @ $300.00 1,200.00$ 3,800.00$

Soil Gas MonitoringField Technician II - 8 hr(s) @ $45.00 360.00$

Monitoring and Sampling Equipment - 1 day(s) @ $75.00 75.00$ Subtotal per Event 435.00$

Subtotal 18 Months 9,135.00$ (21 events)

Samples, TO-2 (Air) - 3 @ $200.00 600.00$

subtotal 15,511.40$

Phase II - Short-Term Vapor Mitigation System Efficacy, Soil Gas Intrusion, and Ground Water monitoring and Reporting




December 19, 2008



Voice 802-658-0820/Fax 802-860-1014

Phase II (cont)Task II - Downgradient Vapor Mitigation Systems

156, 162, 164 Battery Street Properties

Electric Consumption1/4Horsepower Blower (.25kW/hr) - 3294 kWhr.(s) $0.15 494.10$


Monitoring and Sampling Equipment - 1 day(s) @ $75.00 75.00$ 435.00$

9,135.00$

Samples, TO-2 (Air) - 3 @ $200.00 600.00$

30,687.30$ Task III - Sub Slab Vapor Monitoring Point

27 Main Street, 40 King Street, 168 Battery Street and 174 Battery Street

Soil Gas Monitoring

Field Technician II - 8 hr(s) @ $45.00 360.00$ Monitoring and Sampling Equipment - 1 day(s) @ $75.00 75.00$

Subtotal per Event 435.00$ Subtotal per Building (18 months) 1,305.00$

(3 events)

5,220.00$ Task IV - Ambient Indoor Air Sampling

17 Buildings (2 samples per building), 1 Duplicate, 1 Outdoor

Senior Project Manager - 6 hr(s) @ $76.50 459.00$ Field Technician II - 12 hr(s) @ $45.00 540.00$ Field Technician II - 12 hr(s) @ $45.00 540.00$

SKC Pump Rentals - 37 pumps @ $40.00 1,480.00$ Samples, TO-2 (Air) - 36 @ $200.00 7,200.00$

Subtotal per Event 10,219.00$

30,657.00$ Task V - Ground Water Sampling

Senior Project Manager - 4 hr(s) @ $76.50 306.00$ Field Technician II - 24 hr(s) @ $45.00 1,080.00$ Field Technician II - 24 hr(s) @ $45.00 1,080.00$

Interface Probe - 2 day(s) @ $47.00 94.00$ Low flow Sampling Equipment - 2 day(s) @ $150.00 300.00$

Generator - 2 day(s) @ $75.00 150.00$ Samples, EPA Method 8260 (Water) - 22 @ $185.00 4,070.00$

Waste Disposal - 1 drum(s) @ $300.00 300.00$

7,380.00$

subtotal (3 buildings x 18 months)

subtotal (4 buildings x 18 months)

subtotal (3 events)

subtotal




December 19, 2008



Voice 802-658-0820/Fax 802-860-1014

Task VI - As-Built Soil Gas Intrusion/Monitoring Reports

Senior Project Manager - 12 hr(s) @ $76.50 918.00$ CAD/GIS - 3 hr(s) @ $50.00 150.00$

Administrative Assistant - 2 hr(s) @ $31.50 63.00$

Subtotal per Building 1,131.00$

9,048.00$ Task VII - Phase II - Corrective Action Report

Senior Project Manager - 40 hr(s) @ $76.50 3,060.00$ CAD/GIS - 12 hr(s) @ $50.00 600.00$

Administrative Assistant - 5 hr(s) @ $31.50 157.50$

3,817.50$

Phase II (cont)Weekly Updates to Client

Senior Project Manager - 1 hr(s) @ $76.50 38.25$

subtotal (72 weeks) 2,754.00$ subtotal 2,754.00$

SUBTOTAL PHASE II 105,075.20$

Phase III - Long Term Operation and Monitoring

Long Term Operation and Management Plan Implementation Assumptions:- Operation of all vapor mitigation systems for 5 years.- Quarterly monitoring of all vapor mitigation systems for 5 years.- Annual ambient indoor aor samples required for 2 years.- Ground water sampling will be necessary from all wells annually for 5 years.

Task I - Long Term Operations and Management PlanSenior Project Manager - 40 hr(s) @ $76.50 3,060.00$

CAD/GIS - 12 hr(s) @ $50.00 600.00$ Administrative Assistant - 5 hr(s) @ $31.50 157.50$

3,817.50$ Task II - Blinn House

Electric ConsumptionOne Horsepower Blower (1kW/hr) - 43920 kWhr.(s) $0.15 6,588.00$

Carbon ConsumptionVapor Carbon Canister AC-1 - 4 @ $624.75 2,499.00$

Carbon Disposal - 4.0 drum @ $300.00 1,200.00$ 3,699.00$


Monitoring and Sampling Equipment - 1 day(s) @ $75.00 75.00$ Subtotal per Quarter 255.00$

Subtotal 5 Years 5,100.00$ (20 events)

15,387.00$

subtotal (8 buildings)

subtotal

subtotal

subtotal (5 years)




December 19, 2008



Voice 802-658-0820/Fax 802-860-1014

Phase III (cont)Task III - Downgradient Vapor Mitigation Systems

156, 162, 164 Battery Street Properties

Electric Consumption1/4Horsepower Blower (.25kW/hr) - 10980 kWhr.(s) $0.15 1,647.00$


Monitoring and Sampling Equipment - 1 day(s) @ $75.00 75.00$ Subtotal per Quarter 435.00$

Subtotal per Building (5 Years) 9,135.00$ (20 events)

32,346.00$ Task IV - Ambient Indoor Air Sampling

17 Buildings (2 samples per building), 1 Duplicate, 1 Outdoor

Senior Project Manager - 6 hr(s) @ $76.50 459.00$ Field Technician II - 12 hr(s) @ $45.00 540.00$ Field Technician II - 12 hr(s) @ $45.00 540.00$

SKC Pump Rentals - 37 pumps @ $40.00 1,480.00$ Samples, TO-2 (Air) - 36 @ $200.00 7,200.00$

Subtotal per Year 10,219.00$

20,438.00$

Phase III (cont)Task V - Ground Water Sampling

Senior Project Manager - 4 hr(s) @ $76.50 306.00$ Field Technician II - 24 hr(s) @ $45.00 1,080.00$ Field Technician II - 24 hr(s) @ $45.00 1,080.00$

Interface Probe - 2 day(s) @ $47.00 94.00$ Low flow Sampling Equipment - 2 day(s) @ $150.00 300.00$

Generator - 2 day(s) @ $75.00 150.00$ Samples, EPA Method 8260 (Water) - 22 @ $185.00 4,070.00$

Waste Disposal - 1 drum(s) @ $300.00 300.00$ 7,380.00$

36,900.00$ Monthly Updates to Client

Senior Project Manager - 1 hr(s) @ $76.50 38.25$ subtotal (60 months) 2,295.00$

subtotal 2,295.00$

SUBTOTAL PHASE III 111,183.50$

TOTAL ESTIMATED COSTS 301,657.70$

subtotal (5 years)

subtotal (3 buildings, 5 years)

subtotal (2 years)


1 MAIN ST.

1 MA

IN S

T.

181 BATTERY ST.

187-197 BATTERY ST.

BA

TTE

RY

STR

EE

T

MAIN STREET

1 MAIN ST.

171 BATTERY ST.

180 BATTERY ST.

KING ST.

LAKE CHAMPLAIN23

157 SOUTHCHAMPLAIN ST

51-53 MAIN ST.55 MAIN ST.

27 MAIN ST.

152 BATTERY

156 BATTERY

162 BATTERY

164 BATTERY ST.

168 BATTERY ST.

174-176 BATTERY ST.

22-26 KING ST.

30/40 KING ST.

KING STREET

SO

UTH

CH

AM

PLA

IN S

TRE

ET

STREET

STREET

STREET

31-35 MAIN ST.

FERRY BUILDING

41-47 MAIN ST.


469 469 469

Heindel and Noyes



Environmental Engineering DRAWN BY:

DATE:

PROJECT NO.

FILE:

SCALE:

APPROVED:


PROJ. MGR:

DRAFT FINAL

SHEET:


July 23, 2007

NOTED

1 OF 10

1 MAIN ST.

1 MA

IN S

T.

181 BATTERY ST.

187-197 BATTERY ST.

BA

TTE

RY

STR

EE

T

MAIN STREET

1 MAIN ST.

171 BATTERY ST.

180 BATTERY ST.

KING ST.

LAKE CHAMPLAIN23



27 MAIN ST.

152 BATTERY

156 BATTERY

162 BATTERY

164 BATTERY ST.

168 BATTERY ST.

174-176 BATTERY ST.

22-26 KING ST.

30/40 KING ST.

KING STREET

SO

UTH

CH

AM

PLA

IN S

TRE

ET

STREET

STREET

STREET

31-35 MAIN ST.

FERRY BUILDING

41-47 MAIN ST.


469 469 469

446.2

Heindel and Noyes




DATE:

PROJECT NO.

FILE:

SCALE:

APPROVED:


PROJ. MGR:

DRAFT FINAL

SHEET:


July 23, 2007

NOTED

2 OF 10

1 MAIN ST.

1 MA

IN S

T.

181 BATTERY ST.

187-197 BATTERY ST.

BA

TTE

RY

STR

EE

T

MAIN STREET

1 MAIN ST.

171 BATTERY ST.

180 BATTERY ST.

KING ST.

LAKE CHAMPLAIN23



27 MAIN ST.

152 BATTERY

156 BATTERY

162 BATTERY

164 BATTERY ST.

168 BATTERY ST.

174-176 BATTERY ST.

22-26 KING ST.

30/40 KING ST.

KING STREET

SO

UTH

CH

AM

PLA

IN S

TRE

ET

STREET

STREET

STREET

31-35 MAIN ST.

FERRY BUILDING

41-47 MAIN ST.


B'

A'

C

D

D'

C'

B'

F'

A

F

E'

E

A A'

Heindel and Noyes




DATE:

PROJECT NO.

FILE:

SCALE:

APPROVED:


PROJ. MGR:

DRAFT FINAL

SHEET:


July 23, 2007

NOTED

3 OF 10

ND

367

100

Heindel and Noyes




DATE:

PROJECT NO.

FILE:

SCALE:

APPROVED:


PROJ. MGR:

DRAFT FINAL

SHEET:


July 23, 2007

NOTED

4 OF 10

ND

367

100

Heindel and Noyes




DATE:

PROJECT NO.

FILE:

SCALE:

APPROVED:


PROJ. MGR:

DRAFT FINAL

SHEET:


July 23, 2007

NOTED

5 OF 10

1 MAIN ST.

1 MA

IN S

T.

181 BATTERY ST.

187-197 BATTERY ST.

BA

TTE

RY

STR

EE

T

MAIN STREET

1 MAIN ST.

171 BATTERY ST.

180 BATTERY ST.

KING ST.

LAKE CHAMPLAIN23



27 MAIN ST.

152 BATTERY

156 BATTERY

162 BATTERY

164 BATTERY ST.

168 BATTERY ST.

174-176 BATTERY ST.

22-26 KING ST.

30/40 KING ST.

KING STREET

SO

UTH

CH

AM

PLA

IN S

TRE

ET

STREET

STREET

STREET

31-35 MAIN ST.

FERRY BUILDING

41-47 MAIN ST.


469 469 469

469.0

Heindel and Noyes




DATE:

PROJECT NO.

FILE:

SCALE:

APPROVED:


PROJ. MGR:

DRAFT FINAL

SHEET:


July 23, 2007

NOTED

6 OF 10

1 MAIN ST.

1 MA

IN S

T.

181 BATTERY ST.

187-197 BATTERY ST.

BA

TTE

RY

STR

EE

T

MAIN STREET

1 MAIN ST.

171 BATTERY ST.

180 BATTERY ST.

KING ST.

LAKE CHAMPLAIN23



27 MAIN ST.

152 BATTERY

156 BATTERY

162 BATTERY

164 BATTERY ST.

168 BATTERY ST.

174-176 BATTERY ST.

22-26 KING ST.

30/40 KING ST.

KING STREET

SO

UTH

CH

AM

PLA

IN S

TRE

ET

STREET

STREET

STREET

31-35 MAIN ST.

FERRY BUILDING

NSND/<0.32

NSND/<0.37

0.440.27

ND/<0.39ND/<0.38

ACCESS

ACCESS DENIED

DENIED

ACCESS DENIEDACCESS DENIED

ACCESS DENIEDACCESS DENIED

ND/<0.40ND/<0.36

ND/<0.33ND/<0.31

ND/<0.29ND/<0.37

5'=ND10'=ND

5'=ND10'=ND15'=ND

15'=ND

10'=ND

B

0.27

ACCESS DENIED

ACCESS DENIED

1ST

ND/<0.18

ACCESS DENIED

B

ND/<0.23

1ST0.65

B

ND/<0.21 0.331ST

0.49

B

41-47 MAIN ST.B

ND/<0.49 ND/<0.23


1ST

0.57

NSND/<0.56ND/<0.33

5'=ND10'=ND

10'=209

5'=ND10'=ND

5'=ND10'=ND

4'=ND10'=ND

5'=ND

5'=9,701

5'=9,701

1.79

0.93

3.02

B

1ST

Heindel and Noyes




DATE:

PROJECT NO.

FILE:

SCALE:

APPROVED:


PROJ. MGR:

DRAFT FINAL

SHEET:


July 23, 2007

NOTED

7 OF 10

1 MAIN ST.

1 MA

IN S

T.

181 BATTERY ST.

187-197 BATTERY ST.

BA

TTE

RY

STR

EE

T

MAIN STREET

1 MAIN ST.

171 BATTERY ST.

180 BATTERY ST.

KING ST.

LAKE CHAMPLAIN23



27 MAIN ST.

152 BATTERY

156 BATTERY

162 BATTERY

164 BATTERY ST.

168 BATTERY ST.

174-176 BATTERY ST.

22-26 KING ST.

30/40 KING ST.

KING STREET

SO

UTH

CH

AM

PLA

IN S

TRE

ET

STREET

STREET

STREET

31-35 MAIN ST.

FERRY BUILDING

41-47 MAIN ST.


2,40012

Heindel and Noyes




DATE:

PROJECT NO.

FILE:

SCALE:

APPROVED:


PROJ. MGR:

DRAFT FINAL

SHEET:


July 27, 2007

03336

NOTED

8 OF 10

1 MAIN ST.

1 MA

IN S

T.

181 BATTERY ST.

187-197 BATTERY ST.

BA

TTE

RY

STR

EE

T

MAIN STREET

1 MAIN ST.

171 BATTERY ST.

180 BATTERY ST.

KING ST.

LAKE CHAMPLAIN23



27 MAIN ST.

152 BATTERY

156 BATTERY

162 BATTERY

164 BATTERY ST.

168 BATTERY ST.

174-176 BATTERY ST.

22-26 KING ST.

30/40 KING ST.

KING STREET

SO

UTH

CH

AM

PLA

IN S

TRE

ET

STREET

STREET

STREET

31-35 MAIN ST.

FERRY BUILDING

41-47 MAIN ST.


Heindel and Noyes




DATE:

PROJECT NO.

FILE:

SCALE:

APPROVED:


PROJ. MGR:

DRAFT FINAL

SHEET:


July 23, 2007

NOTED

9 OF 10

1 MAIN ST.

1 MA

IN S

T.

181 BATTERY ST.

187-197 BATTERY ST.

BA

TTE

RY

STR

EE

T

MAIN STREET

1 MAIN ST.

171 BATTERY ST.

180 BATTERY ST.

KING ST.

LAKE CHAMPLAIN23



27 MAIN ST.

152 BATTERY

156 BATTERY

162 BATTERY

164 BATTERY ST.

168 BATTERY ST.

174-176 BATTERY ST.

22-26 KING ST.

30/40 KING ST.

KING STREET

SO

UTH

CH

AM

PLA

IN S

TRE

ET

STREET

STREET

STREET

31-35 MAIN ST.

FERRY BUILDING

41-47 MAIN ST.


2,40012

Heindel and Noyes




DATE:

PROJECT NO.

FILE:

SCALE:

APPROVED:


PROJ. MGR:

DRAFT FINAL

SHEET:


June 9, 2008

03336

NOTED

10 OF 10