certified return receipt requestedanacondasuperfund.com/library/files/2.17.14.23.pdf · table 2 -...

May 23, 2014

CERTIFIED – RETURN RECEIPT REQUESTED

Mr. Charlie Coleman Mr. Joel Chavez

EPA Region VIII DEQ

Montana Office Remediation Division

10 West 15th Street, Suite 3200 P.O. Box 200901

Helena, Montana 59626-0096 Helena, Montana 59620-0901

Subject: Individual Site Work Plans (ISWPs) for facility polygons WGAL-003.28, WGAL-

006.06-A and WGAL-007.01

Dear Gentlemen:

Please find enclosed two copies each of the Individual Site Work Plans (ISWPs) for agricultural/

open space facility polygons (WGAL-003.28, WGAL-006.06-A and WGAL-007.01) located

within the West Galen Expansion Area of the Anaconda Smelter NPL Site. The attached ISWPs

summarize data collected under the Agency-approved Facility Sampling and Analysis

Memorandum and identify appropriate remedial requirements and performance standards for

these facilities in accordance with the ARWW&S OU ROD and Final Vegetation Management

Plan (VMP). The attached ISWPs have also been revised as identified in preliminary Agency

comments and as discussed in the February 26, 2014 technical meeting between Atlantic

Richfield and Agency representatives.

Please call me at (406) 723-1813 if you have any questions.

Sincerely,

Shannon Dunlap

Operations Project Manager

cc: Julie DalSoglio/EPA – (w/o enc.)

Joe Vranka/EPA – (w/o enc)

Andy Lensink/EPA – (1 CD)

Katherine Haque-Hausrath/DEQ – (1 CD)

Gunnar Emilsson/CDM

Ken Brockman/BOR

Connie Ternes-Daniels/ADLC – (1 CD)

Ron Halsey/Atlantic Richfield – (email w/o enc.)

Roy Thun/Atlantic Richfield – (email – w/o enc.)

Charlie Coleman/Joel Chavez

Kevin Bethke/TREC

John Davis/Poore, Roth and Robinson – (email – w/o enc.)

Duane Logan/Pioneer

File: 72.04.110.1 – RDU 16 (w/certs) (w/o enc.)

72.04.130.16 (w/o enc.)

Library: 1 hard copy / 1 electronic copy

Chron. (w/o enc.)

Anaconda Smelter NPL Site

Old Works/East Anaconda Development Area Operable Unit; and

Anaconda Regional Water, Waste and Soils Operable Unit

Facilities Sampling

PRLU (WGAL-006.06-A)

Individual Site Work Plan (ISWP)

Atlantic Richfield Company

May 2014


Old Works/East Anaconda Development Area Operable Unit; and

Anaconda Regional Water, Waste and Soils Operable Unit

Facilities Sampling

PRLU (WGAL-006.06-A)

Individual Site Work Plan (ISWP)

Prepared for:

Atlantic Richfield Company

317 Anaconda Road

Butte, Montana 59701

Prepared by:

TREC, Inc.

1800 W. Koch, Suite 6

Bozeman, Montana 59715

May 2014

WGAL-006.06-A ISWP

Anaconda Smelter NPL Site Page i

Z:\Current_Projects\2103_AR_MT_ARWW\2103-Site_Wide_Support\Sitewide Design Issues\Facilities\2014\ISWP_Resubmittals\9-WGAL-006_06-A_ISWP\Facilities ISWP WGAL-006_06-

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TABLE OF CONTENTS

1.0 INTRODUCTION AND PROJECT DESCRIPTION ......................................................... 1

1.1 Purpose and Objectives ............................................................................................ 1

1.2 Project Organization ................................................................................................. 1

1.3 Site Description ........................................................................................................ 1

2.0 PROJECT ACTIVITIES ...................................................................................................... 2

2.1 Description of Project Activities .............................................................................. 2

2.2 Sample Location Documentation ............................................................................. 2

2.2.1 Sample Labeling ............................................................................................ 2

2.2.2 Field Documentation ..................................................................................... 2

2.3 Analytical methodology ........................................................................................... 3

2.4 SAP Deviations ........................................................................................................ 3

3.0 REMEDIAL ACTION OBJECTIVES AND REQUIREMENTS ....................................... 3

4.0 SITE CHARACTERIZATION ............................................................................................ 3

4.1 Previous Investigations ............................................................................................. 3

4.2 2010 Facility Sampling ............................................................................................ 4

4.3 Analysis .................................................................................................................... 5

5.0 SELECTED REMEDIAL ACTION .................................................................................... 5

6.0 REFERENCES .................................................................................................................... 7

WGAL-006.06-A ISWP

Anaconda Smelter NPL Site Page ii


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LIST OF TABLES

Table 1 - LRES Phase III Sample Results

Table 2 - 2010 Facility Sampling Data Summary Table

Table 3 - Soil Analytical Requirements

Table 4 - Sample Location

LIST OF FIGURES

Figure 1: Vicinity Map – Facilities Sampling and Analysis

Figure 2: Facility Sampling PRLU Polygon WGAL-006.06-A

LIST OF APPENDICES

APPENDIX A: LABORATORY DATA

Appendix A.1 Ashe Analytics Data

Appendix A.2 MSE, Inc. Data

APPENDIX B: SAMPLE CHAIN-OF-CUSTODIES

Appendix B.1 Ashe Analytics Data

Appendix B.2 MSE, Inc. Data

APPENDIX C: FIELD LOGS

WGAL-006.06-A ISWP

Anaconda Smelter NPL Site Page 1


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1.0 INTRODUCTION AND PROJECT DESCRIPTION

1.1 Purpose and Objectives

The Facilities designation for various polygons within the ARWW&S OU was initially used as

an overarching category for regions where the Land Reclamation Evaluation System (LRES)

protocol and/or remedial logic may not have been appropriate or may require modifications

because of past or present activities within the specific area. Sampling was performed within

individual Facility areas, as permitted by landowner access, to better characterize smelter related

impacts and determine remedial requirements, as appropriate. The goal was to obtain sufficient

soils data to determine the extent and magnitude of soil arsenic concentrations in comparison to

the appropriate human health arsenic action levels. In some instances, sampling was proposed to

determine if Superfund obligations are present or whether designation of the area as No Further

Action is appropriate.

This facility was sampled under the Agency-approved Facilities Sampling and Analysis

Memorandum and is located in West Galen Expansion Area 1 of the Anaconda Regional Water,

Waste and Soils (ARWW&S) Operable Unit (OU) at the Anaconda Smelter NPL site. This

ISWP summarizes the Remedial Action Objectives (RAO’s), reviews data and observations from

current and previous investigations, evaluates the need for remedial action, and identifies

appropriate remedial actions and performance standards for Preliminary Land Remediation Unit

(PRLU) polygon WGAL-006.06-A in accordance with the Record of Decision (ROD) (EPA,

1998) and Final Vegetation Management Plan (VMP) (Atlantic Richfield, 2013) for the

ARWW&S OU.

Remedial Action (RA) construction activities required to complete the remedies identified in this

ISWP will be performed in accordance with the requirements for RA implementation approved

in the West Galen Expansion Area FDR/RAWP (Atlantic Richfield, 2005), including applicable

construction quality assurance, historic preservation, and environmental requirements.

1.2 Project Organization

Atlantic Richfield’s designated representative; TREC, Inc. in conjunction with EPA oversight

personnel was responsible for determining the location of the soil sample pits, performing the

excavation of the sample pits and collecting the soil samples. Prior to sampling activities,

appropriate landowners were contacted to facilitate access to the site. TREC reviewed the data

with respect to the remedial action requirement and developed this ISWP.

1.3 Site Description

WGAL-006.06-A is located in sections 7 and 8 of township 5N range 10W between Antelope

Creek and Elk Haven Drive (see the Facilities Vicinity Map provided as Figure 1). The facility

is approximately 30 acres in size has been historically used for private grazing with several

horses occupying the pasture seasonally. Based on current land use, the recreational/open

WGAL-006.06-A ISWP



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space/agricultural action level of 1,000 mg/kg for surface soil arsenic is appropriate for areas

within this facility. Two previous sampling locations existed within the facility. Four (4)

additional locations were sampled under the Facility Sampling and Analysis Memorandum to

further characterize potential smelter related impacts at the site and assist in evaluation of

remedial requirements.

2.0 PROJECT ACTIVITIES

2.1 Description of Project Activities

Sampling locations under the Facilities Sampling and Analysis Memorandum were identified to

better characterize smelter related impacts and determine remedial requirements, as appropriate.

All sample pits were excavated by hand. The sample crew typically consisted of a 2 person crew

accompanied by an Agency representative. All field data and analytical samples were collected

as directed by the Facilities Sampling and Analysis Memorandum and documented in the Field

Log book. Upon the end of each sampling day, the sample crew would complete the Chain-of-

Custodies for the samples. The samples were then delivered to the laboratories within a few

days following sample collection. After samples were collected, each test pit was backfilled by

hand but not reseeded. Care was taken during all phases of the sampling effort to minimize

damage to the existing vegetation.

2.2 Sample Location Documentation

2.2.1 Sample Labeling

Sample locations were labeled by location and depth interval according to the list provided in the

Facilities Sampling and Analysis Memorandum. Depth intervals were labeled as follows:

0 to 2 inches (A interval; surface sample);

2 to 6 inches (B interval);

0 to 6 inches (C interval); and

6 to 12 inches (D interval).

Location labels generally followed the format of FAC for Facilities sampling followed by a two

digit year identifier illustrating the year sampled followed by a sequential number. An example

of a sample label is as follows (FAC-10-101A). Figure 2 shows the final locations of the sample

points overlaid on an aerial basemap.

2.2.2 Field Documentation

A field log book was maintained during this sampling investigation. Copies of the field logs are

included as Appendix C. The original field log books for the facilities sampling event are

located in the offices of TREC, Inc. in Bozeman, Montana.

WGAL-006.06-A ISWP



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2.3 Analytical methodology

Table 3 presents the analytical methods used for sample analysis. Quantitative laboratory

measurements include arsenic, cadmium, copper, lead, zinc and pH for all samples. Table 2 of

the Facilities Sampling and Analysis Memorandum (Atlantic Richfield, 2010) provides

additional detail on the analytical method used for analysis of these parameters. All analyses are

consistent with the Clark Fork River Superfund Site Investigation Lab Analytical Protocols (CFR

SSI LAP) and Quality Assurance Project Plan (QAPP) (PTI, 1992b) unless otherwise noted.

2.4 SAP Deviations

Duplicate metals and duplicate pH samples were not collected for this area.

3.0 REMEDIAL ACTION OBJECTIVES AND REQUIREMENTS

Remedial requirements for impacted soils that are applicable to areas within the ARWW&S OU

are identified in the ROD and FDRs/RAWPs. Design criteria relevant to “facility” areas

identified in this plan include:

Reduce arsenic concentrations at the surface to below human health arsenic action levels

– 1,000 mg/kg for open space/agriculture/recreation, 500 mg/kg for commercial/

industrial areas, 250 mg/kg for residential areas and 2,500 mg/kg for steep slope areas in

Smelter Hill RDUs 3 and 14 where access restrictions are in place through Atlantic

Richfield ownership or restrictive covenants.

High arsenic area – In areas of good vegetation (i.e. Dutchman) or of beneficial use (i.e.

historic areas) that are owned by Atlantic Richfield or a government entity and exceed the

arsenic action level, implementation of ICs may be appropriate through management of

the area as a high arsenic area.

Additionally, evaluations of vegetation performance standards and monitoring and maintenance

(M&M) requirements are made based on land use pursuant to requirements identified in the Final

VMP for the ARWW&S OU (Atlantic Richfield, 2013), or the Modifying Criteria of the LRES

where standards under the VMP are inappropriate.

4.0 SITE CHARACTERIZATION

4.1 Previous Investigations

Previous investigations were conducted at the site under the Land Reclamation Evaluation

System (LRES). The soil samples collected during the LRES evaluations were typically

analyzed for arsenic, cadmium, copper, lead and zinc concentrations as well as rock content, pH

and liming requirements for use in remedial design. The previous investigations within polygon

WGAL-006.06-A were conducted during LRES Phase III datagap/boundary investigation

sampling activities and are summarized in Table 1 below. Sampling locations are shown on

Figure 2.

WGAL-006.06-A ISWP



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Table 1 - LRES Phase III Sample Results

Sample ID Depth

(inches)

As Cd Cu Pb Zn Soil pH

(standard

units) (mg/kg)

04-018A 0-2 141 595 249

04-018AD 0-2 181 615 250

04-018B 2-6 88 207 189

04-018BD 2-6 83 138 194

04-018C 0-6 144 502 250 6.9

04-018CD 0-6 159 676 279 6.7

04-018D 6-12 94 124 87 7.0

04-018DD 6-12 114 76 54 7.1

04-019A 0-2 208 1080 509

04-019B 2-6 139 397 316

04-019C 0-6 202 932 467 6.5

04-019D 6-12 95 146 104 6.9

4.2 2010 Facility Sampling

Soils data for arsenic and other metals including, cadmium, copper, lead, and zinc were collected

to evaluate potential human health impacts as well as the potential impacts to vegetation

establishment. Sample data collected during the Facility sampling of polygon WGAL-006.06-A

are presented in Table 2 below. Sampling locations are shown on Figure 2.

Table 2 - 2010 Facility Sampling Data Summary Table

Sample ID Depth

(inches)

As Cd Cu Pb Zn Soil pH

(standard

units) (mg/kg)

FAC-010-073A 0-2 116 5 923 139 354

FAC-010-073B 2-6 142 4 765 117 360

FAC-010-073C 0-6 6.4

FAC-010-073D 6-12 74 4 164 35 137

FAC-010-074A 0-2 261 5 1620 231 473

FAC-010-074B 2-6 167 4 801 87 367

FAC-010-074C 0-6 6.3

FAC-010-074D 6-12 86 4 230 41 144

FAC-010-075A 0-2 132 4 518 102 256

FAC-010-075B 2-6 95 5 435 53 360

FAC-010-075C 0-6 6.9

FAC-010-075D 6-12 52 4 77 17 92

FAC-010-076A 0-2 337 4 1570 304 609

FAC-010-076B 2-6 144 4 800 54 349

FAC-010-076C 0-6 6.3

FAC-010-076D 6-12 120 4 152 27 134

WGAL-006.06-A ISWP



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4.3 Analysis

As previously mentioned, Facility WGAL-006.06-A represents a 30 acre active grazing parcel

that is located between Antelope Creek and Elk Haven Drive and is privately owned. All

samples collected from the facility were below the applicable arsenic action level of 1,000 mg/kg

for agricultural/open space properties and all but two locations exhibited arsenic values below

the residential action level of 250 mg/kg. Two locations had Total Metal Indices (TMI =

As+Cu+Zn) greater than the moderate plant stress level of 1,700 mg/kg identified in the VMP

and soil pH values in the 0-6 inch interval were occasionally depressed slightly below 6.5

standard units.

5.0 SELECTED REMEDIAL ACTION

Based on the collected data and site characterization information presented in Section 4.0,

applicable Superfund impacts, remedial requirements, and performance standards for the

WGAL-006.06-A facility are summarized below.

Superfund Impacts

While soil arsenic concentrations are substantially below the applicable recreational/open

space/agricultural action level of 1,000 mg/kg at all sampled locations, the TMIs at some

locations are greater than the moderate plant stress level of 1,700 mg/kg identified in the VMP

and soil pH values are slightly depressed. Therefore, smelter related impacts have been

identified that are likely inhibiting vegetation establishment and require remediation in

accordance with the ARWW&S OU ROD.

Remedial Requirements

Based on collected data and consistent with adjacent remedial polygons, the selected remedy to

mitigate identified Superfund impacts in WGAL-006.06-A is T6 (tillage to 6 inches) adding lime

amendment with the primary objective establishing/improving site vegetation. The tillage

remedy will be performed with lime to further reduce containment concentrations relative to the

moderate plant stress level identified in the VMP while ameliorating soil pH values in

accordance with root zone criteria established for the Site. Additionally, facility sampling data

indicates that implementation of a T6 remedy will likely reduce surface arsenic concentrations

below the residential land use action level of 250 mg/kg, thereby classifying the facility as a

Category 1 (Unrestricted Use) area under the Final VMP.

Additional sampling will be required prior to implementing the tillage remedy to determine

appropriate soil amendment requirements. The need for lime amendment has been confirmed

based on facility sampling pH data. Therefore, soil acid-base accounting (ABA) and rock

content data will be collected prior to construction for use in determining lime application rates.

The need for Organic Matter (OM) addition in this area will also be evaluated by conducting an

A-Horizon/OM investigation to evaluate existing soils and prescribe OM amendment as

WGAL-006.06-A ISWP



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necessary to achieve a final organic content of 1.5% in the top 6 inches, based on dry weight.

Revegetation fertilizer and seed mixes will be prescribed consistent with adjacent remedy areas

unless otherwise agreed through landowner access coordination. All tillage, soil amendment,

and revegetation activates will be implemented as specified in the agency-approved West Galen

Expansion Area FDR/RAWP (Atlantic Richfield, 2005).

Post-RA confirmation sampling will be required to verify the tillage remedy has successfully

reduced soil arsenic concentrations below 250 mg/kg if the area is to be classified as Category 1

(Unrestricted Use). Details regarding the post-RA confirmation sampling protocols required to

classify parcels as Category 1 at the ARWW&S OU are currently under development, and will

be applied to this area during construction as formally agreed. The need for additional tillage

efforts (i.e., additional or deeper passes) may be identified in some areas to further reduce

surface arsenic concentrations to levels at or below the residential land use action level of 250

mg/kg, as determined by confirmation sampling during construction.

Performance Standards

Following RA implementation and pending confirmation that the tillage remedy has achieved

Category 1 status, the area would normally be subject to an Operational and Functional

evaluation and two years of post-RA weed management. If Category 1 status is not confirmed,

the area would normally require LRES monitoring and compliance determinations as a Category

2 property in accordance with requirements identified in the Final VMP.

This area has been historically used for grazing and several horses occupy the pasture seasonally.

Under its current land use (active horse pasture), the facility may not pass the vegetation

performance criteria identified in the VMP for typical Category 1 or Category 2 properties

following remediation. However, as discussed in the February 26, 2014 meeting between

Atlantic Richfield and EPA representatives, application of LRES modifying criteria may be

appropriate if current land use practices continue that inhibit vegetation establishment.

Following two years of post-RA weed management and upon either passing the O&F inspection

or application of the LRES modifying criteria as appropriate, this area will be designated as a No

Further Action (NFA) Category 1 (Unrestricted Use) area with no additional Superfund

obligations and unrestricted land use from a Superfund perspective. Future development within

this facility, however, will still be subject to all remaining and relevant provisions of the ADLC

Developmental Permit System (DPS) and other applicable federal, state, and local laws as

enforced by the ADLC.

WGAL-006.06-A ISWP



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6.0 REFERENCES

EPA, 1998. Anaconda Smelter NPL Site, Anaconda Regional Water, Waste and Soils

(ARWW&S) Operable Unit (OU) Record of Decision (ROD). September 1998.

EPA, 2000. Final Remedial Design Work Plan, Anaconda Regional Water, Waste and Soils

Operable Unit, Anaconda Smelter NPL Site, Anaconda, MT. Prepared for EPA by CDM

Federal Programs Corporation. June 26, 2000.

Atlantic Richfield, 2013. Anaconda Smelter NPL Site, Anaconda Regional Water, Waste &

Soils OU, Final Vegetation Management Plan. May 2013.

Atlantic Richfield, 2010. Facilities Sampling and Analysis Memorandum, Anaconda Regional

Water, Waste and Soils Operable Units, Old Works/East Anaconda Development Area

Operable Unit, Anaconda, MT. May 2010.

Atlantic Richfield, 2005. West Galen Expansion Area Final Design Report/Remedial Action

Work Plan, Anaconda Regional Water, Waste and Soils Operable Unit, Anaconda Smelter

NPL Site, Anaconda, MT. June 2005.

WGAL-006.06-A ISWP



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Table 3 - Soil Analytical Requirements

Analyte Analytical Method Container

Requirements Preservative

Holding

Times

Reporting

Limits

(mg/kg)

Arsenic USEPA 6010B

Ziploc plastic

bags None

6 months 1.0 mg/kg

Cadmium USEPA 6010B 6 months 0.3 mg/kg

Copper USEPA 6010B 6 months 1.5 mg/kg

Lead USEPA 6010B 6 months 0.5 mg/kg

Zinc USEPA 6010B 6 months 2.5 mg/kg

pH

(Saturated

paste)

ASA Monograph 9,

Part 2, Method 10-3.2 NA NA

WGAL-006.06-A ISWP



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Table 4 - Sample Location

Sample ID Northing Easting

FAC-010-073A

730679.8620 1109310.8959 FAC-010-073B

FAC-010-073C

FAC-010-073D

FAC-010-074A

730338.2360 1109600.8284 FAC-010-074B

FAC-010-074C

FAC-010-074D

FAC-010-075A

730344.9786 1110484.1114 FAC-010-075B

FAC-010-075C

FAC-010-075D

FAC-010-076A

730039.3133 1111479.7714 FAC-010-076B

FAC-010-076C

FAC-010-076D

WGAL-006.06-A ISWP



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Figures

Figure 1: Vicinity Map – Facilities Sampling and Analysis

Figure 2: Facility Sampling PRLU Polygon WGAL-006.06-A

SHOP-011.01

WGAL-008.01

WGAL-007.01

FT-006

OWSR-010.02

SHOP-005

Gochanour 2

FT-008.05

FT-008.02

FT-011

FT-008.04

WGAL-003.28

FT-010.01

WGAL-006.06-A

FT-009.11

OWSR-014.08

FT-010.02

SHOP-008

SMHL-028

FT-012

OWSR-005

WGAL-003.10

SMHL-055.06

WGAL-003.29

SMHL-055.07

WGAL-001.02

LTCK-002.13LTCK-017.01

FT-008.07

LTCK-002.11

R.D.U.#8-Opportunity Ponds

WEST GALEN EXPANSION

R.D.U.#1-Stucky Ridge

CSOU

R.D.U.#9-Fluvial Taillings

R.D.U.#3-Smelter Hill Uplands

R.D.U.#6-South Opportunity Uplands

R.D.U.#2-Lost Creek

R.D.U.#15-Mt. Haggin

R.D.U.#13-Old Works WMA

R.D.U.#14-Smelter Hill Facilities

R.D.U.#4-Anaconda Ponds

R.D.U.#12-Slag

R.D.U.#10-Warm Springs Creek

R.D.U.#7-North Opportunity Uplands

R.D.U.#5-Blue Lagoon/Active Railroad

R.D.U.#11-Cashman Pile

8 9

89

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7

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4

2

7

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1 63

3

11

11

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11

12

24

15

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20

17

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29

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28

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§̈¦90

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Stewart St.

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4TH ST.

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Haus

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6TH ST.Fa

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OUTLAW Trl

Elk Haven Dr.

Dixon

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5TH ST.

Leslie

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8TH ST.

COMMERCIAL ST.

Smith St.

BEAR PAW Trl

ASPEN HILLS Rd

Erickson St.

Norris

St.

Schu

yler S

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MAPL

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Crosby St.

White

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Fairmont Rd.

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Lost Creek

Mill Creek

Silver Bow Creek

Willow Creek

Antelope Creek

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Clear Creek

Warm Springs Creek

Modesty Creek

Homestead Creek

Gregson

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«

LegendFacility PolygonsRDU BoundariesSection

Hydrologic FeaturesInterstateState Highway

1 0 10.5 Miles

File: Facilities_Plan.mxd Date: 13-Mar-2014

OWSR-014.08

LTCK-002.13

LTCK-017.01LTCK-002.11

3025

1924

29

LOST CREEK RD.

LOST CREEK RD.

Lost Creek

SEE MAPINSET

AFFCO

FIGURE 1VICINITY MAP

FACILITIES SAMPLING & ANALYSISARWW&S OPERABLE UNIT

ANACONDA, MONTANA

%%%%

%%%% %%%%

%%%%

%%%%

%%%%

%%%%%%%%

%%%%04-019

04-01801-034

FAC-010-076

FAC-010-075FAC-010-074

FAC-010-073

WGAL-006.02

WGAL-006.06-A

WGAL-006.06-B

WGAL-003.15-B WGAL-003.15-A

WGAL-005.01

7 8

Source: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, andthe GIS User Community

File: Facil_Samp_WGAL-006.06-A.mxd Date: 12-May-2014

Facilities SamplingPRLU Polygon WGAL-006.06-A

ARWW&S Operable UnitAnaconda Smelter NPL Site

Figure 2

ª

Legend% Facility Samples% LRES Phase III Samples

PRLU PolygonsSection Line

250 0 250125

Feet

Note: Sampling was conducted by TREC, Inc. on 8.6.2010 underAnaconda Smelter NPL Site, OW/EADA OU and ARWW&S,Facilities Sampling and Analysis Memorandum (May 2010).

WGAL-006.06-A28.4

1000 ppm WGE

As Cd Cu Pb Zn

FAC-010-073A 0-2 116 5 923 139 354FAC-010-073B 2-6 142 4 765 117 360FAC-010-073C 0-6 6.4FAC-010-073D 6-12 74 4 164 35 137FAC-010-074A 0-2 261 5 1620 231 473FAC-010-074B 2-6 167 4 801 87 367FAC-010-074C 0-6 6.3FAC-010-074D 6-12 86 4 230 41 144FAC-010-075A 0-2 132 4 518 102 256FAC-010-075B 2-6 95 5 435 53 360FAC-010-075C 0-6 6.9FAC-010-075D 6-12 52 4 77 17 92FAC-010-076A 0-2 337 4 1570 304 609FAC-010-076B 2-6 144 4 800 54 349FAC-010-076C 0-6 6.3FAC-010-076D 6-12 120 4 152 27 134

04-018A 0-2 141 595 24904-018AD 0-2 181 615 25004-018B 2-6 88 207 189

04-018BD 2-6 83 138 19404-018C 0-6 144 502 250 6.9

04-018CD 0-6 159 676 279 6.704-018D 6-12 94 124 87 7.0

04-018DD 6-12 114 76 54 7.104-019A 0-2 208 1080 50904-019B 2-6 139 397 31604-019C 0-6 202 932 467 6.504-019D 6-12 95 146 104 6.9

As > 250ppm at 0-2 inches Yes 2 sample locations

FacilitiesISWP Design Criteria Summary

Land Owner: Private (Violette) Polygon numberLand Use: Agriculture Total AcresArsenic Action Level: RDUAs > Action Level at 0-2 inches No

LRES Phase III Sample Results

Design Justification Discussion: Soils data identify no active remedial requirements necessary to reduce soil arsenic concentrations below the applicable agricultural/open space/recreational action level of 1,000 mg/kg. However elevated total metals, slightly depressed soil pH values, and existing vegetation conditions indicate smelter related impacts are likely inhibiting vegetation establishment and require remediation. A T6 remedy with lime amendment is recommended for this facility consistent with adjacent West Galen areas to ameliorate soil pH and improve site vegetation. Sample data indicates that implementing the T6 remedy will also achieve an additional goal of reducing surface arsenic concentrations to below the residential action level of 250 mg/kg, thereby classifying the area as Category 1 (Unrestricted Use) under the Final VMP. Soil amendment requirements (lime and OM) will be determined by additional sampling prior to RA construction.

REMEDY BASED ON EVALUATION OF BELOW DATA: T6 with Lime

Sample ID Depth (inches)

Soil pH (standard units)(mg/kg)

WGAL-006.06-A ISWP



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Appendix A

Laboratory Data

WGAL-006.06-A ISWP



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Appendix A.1

Ashe Analytics Data

Sheet1

Page 1

TO: TREC, INC. AUG. 16, 2010 K BETHKE D PIPINICH

FROM: ASHE ANALYTICS JOHN ASHE

SUBJECT: ANALYTICAL REPORT NO. KBD0816KPROJECT: 9202 - FACILITIES

FORTY-TWO (42) SAMPLES WERE RECEIVED ON AUG. 06, 2010 FORTOTAL METALS ANALYSIS (As, Cd, Cu, Pb, & Zn) BY XRF.RESULTS ARE PRESENTED BELOW.

SAMPLELAB SAMPLE As As Cd Cd Cu Cu Pb Pb Zn Zn PREPNUMBER I.D. mg/kg FLAG mg/kg FLAG mg/kg FLAG mg/kg FLAG mg/kg FLAG GROUPK-1014 FAC-010-074A 261 4.7 1620 231 473 999842.00K-1015 FAC-010-074B 167 3.9 U 801 86.9 367 999842.00K-1016 FAC-010-074D 86.1 3.9 U 230 40.9 144 999842.00K-1017 FAC-010-073A 116 5.0 923 139 354 999842.00K-1018 FAC-010-073B 142 4.4 765 117 360 999842.00K-1019 FAC-010-073D 73.7 3.9 U 164 34.7 137 999842.00K-1020 FAC-010-075A 132 3.9 U 518 102 256 999842.00K-1021 FAC-010-075B 95.4 5.3 435 53.0 360 999842.00K-1022 FAC-010-075D 52.2 3.9 U 77.40 16.9 91.60 999842.00K-1023 FAC-010-076A 337 3.9 U 1570 304 609 999842.00K-1024 FAC-010-076B 144 4.0 800 54.2 349 999842.00K-1025 FAC-010-076D 120 3.9 U 152 26.5 134 999842.00K-1026 FAC-010-060AK-1027 FAC-010-060BK-1028 FAC-010-060DK-1029 FAC-010-059AK-1030 FAC-010-059BK-1031 FAC-010-059DK-1032 FAC-010-058AK-1033 FAC-010-058BK-1034 FAC-010-058DK-1035 FAC-010-057AK-1036 FAC-010-057BK-1037 FAC-010-057DK-1038 FAC-010-056AK-1039 FAC-010-056BK-1040 FAC-010-056DK-1041 FAC-010-055AK-1042 FAC-010-055BK-1043 FAC-010-055DK-1044 FAC-010-051AK-1045 FAC-010-051BK-1046 FAC-010-051DK-1047 FAC-010-052AK-1048 FAC-010-052BK-1049 FAC-010-052DK-1050 FAC-010-053AK-1051 FAC-010-053BK-1052 FAC-010-053DK-1053 FAC-010-054AK-1054 FAC-010-054BK-1055 FAC-010-054D

Not part of polygon WGAL-006.06-A

WGAL-006.06-A ISWP



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Appendix A.2

MSE, Inc. Data

Not part of polygon WGAL-006.06-A

WGAL-006.06-A ISWP



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Appendix B

SAMPLE CHAIN-OF-CUSTODIES

WGAL-006.06-A ISWP



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Appendix B.1

Ashe Analytics Chain-of-Custody

WGAL-006.06-A ISWP



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Appendix B.2

MSE Inc. Chain-of-Custody

WGAL-006.06-A ISWP



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Appendix C

Field Logs

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