Focused Field Investigation, Fall 2008 Northwest Pipe and ...Focused Field Investigation, Fall 2008 Northwest Pipe and Casing Superfund Site, Clackamas, Oregon . U.S. Environmental

Focused Field Investigation, Fall 2008 Northwest Pipe and Casing Superfund Site, Clackamas, OregonContract No. 68-S7-03-04 Task Order No. 020

Prepared for

U.S. Environmental Protection AgencyRegion 101200 Sixth Avenue, Suite 900, Seattle, WA 98101

Prepared by

Parametrix 700 NE Multnomah, Suite 1000 Portland, OR 97232-4110 503-233-2400 www.parametrix.com

February 23, 2009 │ 415-2328-007

http://www.parametrix.com/�

CITATION

U.S. Environmental Protection Agency. 2009. Focused Field Investigation, Fall 2008 Northwest

Pipe and Casing Superfund Site, Clackamas, Oregon. Prepared by Parametrix, Portland, Oregon.

February 23, 2009.

Focused Field Investigation, Fall 2008 Northwest Pipe and Casing Superfund Site, Clackamas, Oregon

U.S. Environmental Protection Agency

DISTRIBUTION LIST

Name Title Organization

Mark Ader Task Order Project Officer EPA (TOPO)

Martha Lentz Supervising Hydrogeologist EPA

Deborah Bailey Project Manager DEQ

Scott Elkind Task Order Manager Parametrix

Eric Roth Technical Lead Parametrix

Adam Romey Project Geologist/Field Parametrix Coordinator

Project File Parametrix

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TABLE OF CONTENTS

EXECUTIVE SUMMARY.....................................................................................ES-1

1. INTRODUCTION ..............................................................................................1-1

1.1 PURPOSE AND GOALS ......................................................................................1-1

1.2 REPORT ORGANIZATION .................................................................................1-2

2. SITE BACKGROUND.......................................................................................2-1

2.1 HYDROGEOLOGIC SETTING............................................................................2-1

2.2 CHEMICALS OF CONCERN...............................................................................2-2

2.3 CLEAN UP LEVELS AND REMEDIAL GOALS ...............................................2-3

2.4 REMEDIAL ACTIONS .........................................................................................2-4

2.5 INTERIM ACTIONS POST-GCWS .....................................................................2-5

3. APPROACH AND METHODS FOR INVESTIGATION .....................................3-1

3.1 DRILLING PROGRAM GOALS AND METHODOLOGIES .............................3-1

3.2 SAMPLE COLLECTION ......................................................................................3-3

3.3 SAMPLE ANALYSIS ...........................................................................................3-5

3.4 DATA MANAGEMENT .......................................................................................3-5

3.5 DATA VALIDATION ...........................................................................................3-6

3.6 BOREHOLE COMPLETION................................................................................3-6

3.7 INVESTIGATION DERIVED WASTE (IDW) ....................................................3-7

4. SUBSURFACE SOILS INVESTIGATION FINDINGS .......................................4-1

4.1 DELINEATION OF THE DNAPL BOUNDARY ................................................4-1

4.2 EVALUATION OF SELECTED SITE FEATURES ............................................4-3

4.3 SUMMARY ...........................................................................................................4-3

5. GROUNDWATER INVESTIGATION FINDINGS...............................................5-1

5.1 ANALYTICAL RESULTS....................................................................................5-1

5.2 DELINEATION OF VOCS IN GROUNDWATER IN THE PLUME 1 SOURCE AREA ....................................................................................................5-1

5.3 WATER QUALITY PARAMETERS AND NATURAL GASSES ......................5-4

5.4 EVALUATION OF UPGRADIENT AND OFF-SITE GROUNDWATER FOR VOCS.............................................................................................................5-5

5.5 SUMMARY AND RECOMMENDATION ..........................................................5-5

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Focused Field Investigation, Fall 2008 Northwest Pipe and Casing Superfund Site, Clackamas, Oregon U.S. Environmental Protection Agency

TABLE OF CONTENTS (CONTINUED)

6. REFERENCES .................................................................................................6-1

LIST OF FIGURES 2-1 November 2007 PCE Isoconcentration Map and Plume Boundaries

3-1 Newly Installed Monitoring Well Location Map

3-2 Test Boring Locations and Identified Features of Concern in the Plume 1 Source Area

4-1 Field Ranking Observations and Approximate DNAPL Boundaries

5-1 PCE Isoconcentration Map for the Plume 1 Source Area, Shallow Water Bearing Zone

5-2 TCE Isoconcentration Map for the Plume 1 Source Area, Shallow Water Bearing Zone

5-3 Cis 1,2-DCE Isoconcentration Map with Posted Values of VC for the Plume 1 Source Area, Shallow Water Bearing Zone

5-4 Naphthalene Isoconcentration Map for the Plume 1 Source Area, Shallow Water Bearing Zone

5-5 PCE Isoconcentration Map for the Plume 1 Source Area, Intermediate Water Bearing Zone

5-6 TCE Isoconcentration Map for the Plume 1 Source Area, Intermediate Water Bearing Zone

5-7 Cis 1,2-DCE Isoconcentration Map with Posted Values of VC for the Plume 1 Source Area, Intermediate Water Bearing Zone

5-8 Naphthalene Isoconcentration Map for the Plume 1 Source Area, Intermediate Water Bearing Zone

5-9 PCE Isoconcentration Map for the Plume 1 Source Area, Deep Water Bearing Zone

5-10 TCE Isoconcentration Map for the Plume 1 Source Area, Deep Water Bearing Zone

5-11 Cis 1,2-DCE Isoconcentration Map with Posted Values of VC for the Plume 1 Source Area, Deep Water Bearing Zone

5-12 Naphthalene Isoconcentration Map for the Plume 1 Source Area, Deep Water Bearing Zone

LIST OF TABLES 2-1. Summary of COCs in Soil and Groundwater ........................................................... 2-3

2-2. Soil Cleanup Levels for COCs ................................................................................. 2-3

2-3. Groundwater Remedial Goals for COCs .................................................................. 2-4

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2-4. Summary of Analytical Results for the DNAPL and Aqueous Fractions from Well MW-207 ......................................................................................................... 2-5

3-1 Test Boring Detail

3-2 Monitoring Well Construction Details

4-1 Summary of Field Ranking Observations and PID Measurements

4-2 Summary of VOCs Concentrations in Subsurface Soil

4-3 Summary of PAHs in Soil

5-1 Summary of VOCs in Groundwater

5-2 Summary of PAHs in Groundwater

5-3 Summary of Water Quality Field Parameters

APPENDICES Appendix A: Test Boring Logs

Appendix B: Laboratory Results CD/ROM

Appendix C: Data Validation Report

Appendix D: Well Development Reports

Appendix E: Investigation Derived Waste Results

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ACRONYMS bgs below ground surface

BTEX benzene, toluene, ethylbenzene, and xylene

Cis 1,2-DCE Cis 1,2 Dichloroethene

CLP contract laboratory program

CMMP Contaminant Media Management Plan

COC chemical of concern

COPCs contaminants of potential concern

CSM conceptual site model

CVOCs chlorinated volatile organic compounds

DEQ Oregon Department of Environmental Quality

DNAPL dense non-aqueous phase liquid

DQI data quality indicator

DQO data quality objective

EA excavation area

EPA U.S. Environmental Protection Agency

ft feet

Ft/ft feet per foot

GCWs groundwater circulation wells

gpm gallons per minute

HARN high accuracy reference network

HCl hydrochloric acid

HQ hazard quotient

IC institutional controls

IDW investigation-derived waste

IRAM interim remedial measure

mg/kg milligrams per kilogram

mL milliliter

MNA monitored natural attenuation

MS matrix spike

MRL method reporting limit

MSD matrix spike duplicate

NAVD88 North American Vertical Datum 1988

NWDC Northwest Development Corporation

ODOT Oregon Department of Transportation

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ACRONYMS (CONTINUED)

ORP oxidation/reduction potential

OU operable unit

PAH polynuclear aromatic hydrocarbon

PCB polychlorinated biphenyl

PCE tetrachloroethene

PID photoionization detector

PRGs preliminary remedial goals

PQL Practical Quantitation Limit

QA/QC quality assurance/quality control

QAPP Quality Assurance Project Plan

RAOs Remedial Action Objectives

RG Remedial Goal

ROD Record of Decision

RQAM Regional Quality Assurance Manager

RPD relative percent difference

RSD relative standard deviation

RSE Remedial System Evaluation

SOP standard operating procedure

TAT turn around time

TCE trichloroethene

TCL target compound list

USCS Unified Soil Classification System

VC vinyl chloride

VOA volatile organic analysis

VOC volatile organic compound

WBZ water-bearing zone

WRD Oregon State Water Resources Department

µg/L micrograms per liter

µg/Kg micrograms per kilogram

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EXECUTIVE SUMMARY

The goals of this investigation were to:

• Delineate the presence or absence of a dense non-aqueous phase liquid (DNAPL) coal tar body in the Plume 1 Source Area.

• Evaluate former site features that include, vertical drains, in-ground structures, and dumping areas where release(s) of coal tar and/or chlorinated solvents may have occurred.

• Delineate the horizontal and vertical extent of volatile organic compounds (VOCs) contamination in groundwater along the northern, southern, and eastern portion of Plume 1 source area in effort to establish the 1 microgram per liter (µg/L) tetrachloroethene (PCE) isoconcentration line along the plume edge.

• Fill in data gaps in the current monitoring well network along the southern and eastern portion of the Plume 1 source area. Install monitoring wells in selected boreholes to help define the 10 microgram per liter (µg/L) isoconcentration line bounding the Plume 1 source area.

• Determine if an upgradient off-site source of shallow groundwater contamination is migrating onto the Site.

• Install a shallow monitoring well in the northwestern corner of the site to help further define the leading edge of the VOC plume.

• Collect information to update the conceptual site model (CSM) and support of remedial alternative evaluation. This includes information on lithologic heterogeneity, ambient water quality condition, residual contaminant mass, and dissolved phase plume.

To help achieve investigation goals, the following activities were completed:

• Dense non-aqueous phase liquids (DNAPL) bodies in the Plume 1 area were delineated to the extent practical by advancing seventeen test borings (B-01 through B-12, B-21, B-22, B-24, B-26, and B-29) to depths of up to 65 feet bgs. The DNAPL bodies were delineated through field and laboratory analysis of depth-discrete soil and groundwater samples. The field program used a ranking system to help define the extent of DNAPL impacts in approximately 150 soil samples. Based on field and laboratory information, twenty five soil samples were analyzed for VOCs and/or polynuclear aromatic hydrocarbons (PAHs) to help further define the nature and extent of contamination within the DNAPL bodies. In addition, thirty eight discrete groundwater samples collected from the Shallow, Intermediate, and Deep water bearing zones (WBZs) were analyzed for VOCs to characterize the Plume 1 Source Area. Selected samples were also analyzed for PAHs and/or natural fixed gasses. Analysis for natural gases was used to evaluate if methanogenesis is occurring in the source area.

• The test boring program evaluated historic site features within Plume 1 as potential sources of contamination.

• The northern, southern, and eastern boundary of Plume 1 was delineated to the extent practical by advancing ten test borings (B-13 through B-20, B-23, and B-28) to a depth of 65 feet below ground surface (bgs). Twenty-seven depth-discrete groundwater samples from the Shallow, Intermediate, and Deep WBZs were

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analyzed for VOCs to help delineate the Plume 1 Source Area (PCE greater than 100 µg/L), contaminant hot spots (PCE greater than 1,000 µg/L) and the Plume 1 boundary (PCE equal to or greater than 1 µg/L). Selected groundwater samples were also collected and analyzed for PAHs. Four monitoring wells MW-208 through MW211 were installed at the approximate 10 µg/L PCE isoconcentration line to help fill in data gaps in the monitoring well network identified in the Remedial System Evaluation (RSE) Report (GeoTrans 2007).

• A monitoring well MW-212 (test boring B-25) was installed in the Shallow WBZ to fill a data gap in the monitoring well network within the northwestern portion of the Site. This well was sampled during the November 2008 site wide sampling event.

• Groundwater was sampled and analyzed for VOCs in test boring B-27 to evaluate if a potential upgradient and off-site source of groundwater contamination was migrating on to the Site.

Investigation results indicated the following findings:

• Three DNAPL bodies, a main body and two smaller bodies reside in the Plume 1 Source Area. These DNAPL bodies are presumably composed of coal tars. The main DNAPL body likely originates near test boring B-06 through B-08. DNAPL was encountered in the main DNAPL body at a depth of 6 feet bgs, with an approximate maximum saturated thickness of 16 feet. The two smaller DNAPL bodies are centered at B-13 and B-14, and at B-16, respectively. DNAPL was encountered in these bodies at an approximate depth of 12 feet bgs, with a maximum saturated thickness of 7 feet and 2 feet, respectively. See Figure 3-2 & Table 4-1.

• Analytical results for soils collected within the DNAPL bodies indicates relatively high concentrations of chlorinated volatile organic compounds (CVOCs), naphthalene, and BTEX (benzene, toluene, ethylbenzene, xylene). In general CVOCs and BTEX concentrations in subsurface soil are limited in extent both laterally and vertically within the DNAPL bodies. PCE and TCE concentrations in soil within the source area exceed site cleanup goals. Naphthalene concentrations in subsurface soil are more pervasive throughout the DNAPL bodies, with detectable concentrations up to 65 feet bgs. See Table 4-1.

• The distribution of DNAPL based on field observations and analytical results for soil suggest that the main DNAPL body is located within the approximate footprint of Former Plant 3. The source of the main DNAPL body may stem from former features in this portion of the Plant 3, which include, but are not limited to, the two in-ground structures and the southeast concrete pad area. The two smaller DNAPL bodies are located within the approximate footprint of Former Plant 4. These DNAPL bodies may stem from former features in this portion of Plant 4, which include the northwest concrete pad area and drain DR-04. See Figure 3-2.

• Analytical results for CVOCs and naphthalene from depth-discrete groundwater samples indicate that high concentrations of these compounds encompass and/or extend from identified DNAPL bodies along the direction of groundwater flow. PCE, TCE, cis 1,2- dichloroethene (DCE) and naphthalene concentrations greater than 1,000 µg/L are observed within and/or north of the DNAPL bodies in the Shallow and Intermediate WBZs. Lower CVOCs, naphthalene, and BTEX concentrations in groundwater are observed in the Deep WBZ than the Shallow and Intermediate WBZs. However, PCE and naphthalene concentrations greater than 1,000 µg/L are observed in the Deep WBZ. Groundwater analytical results are consistent with field

ES-2 │Executive Summary February 23, 2009│ 415-2328-007



observations and soil analytical results regarding contaminant source areas. See Figures 5-1 through 5-12.

• Analytical results for PCE, TCE and cis 1,2-DCE indicate that the extent of these compounds is more pervasive in groundwater in the Shallow, Intermediate and Deep WBZs relative to naphthalene. Naphthalene appears to have attenuated in groundwater within a short distance of the DNAPL bodies. See Figures 5-1 through 5-12.

• Water quality parameters and dissolved gases results suggest that the geochemical conditions in Plume 1 are suitable for biotic and abiotic degradation of PCE and TCE. This is supported by the presence of methane suggesting that methanogenesis is occurring in a portion of the plume, along with the presence of degradation products cis 1,2-DCE and VC.

• Analytical results from depth-discrete groundwater samples collected at the upgradient and off-site location suggest that CVOCs contamination is not migrating onto the Site.

Recommendations:

The conceptual site model (CSM) should be updated using the results from this investigation and the November 2008 site wide groundwater monitoring event. The goal of the updated CSM is to support decision-making approach for the analysis and selection of future remedial actions; and support remedial design. The remedy may include enhanced attenuation, source control measures, and institutional controls. As such, the CSM should present a comprehensive discussion of hydrogeology, nature and extent of contamination, risk-pathway assessment, estimate of source and plume mass, and evaluation of plume stability. In addition, the CSM should provide a discussion on uncertainties or data gaps within the CSM that may affect the decision-making approach.

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ES-4 │Executive Summary February 23, 2009│ 415-2328-007



1. INTRODUCTION

1.1 PURPOSE AND GOALS This report presents the findings for the supplemental field investigation conducted in the Fall 2008 at Northwest Pipe and Casing Superfund Site (Site), Clackamas, Oregon. Findings in the Five Year Review Report (Parametrix 2006) and the Remedial System Evaluation (RSE) Report (Geo Trans 2007) indicated that additional groundwater characterization and revisions to the conceptual site model (CSM) are needed prior to selection of remedial actions at the Site.

Based on this need, the purpose of this investigation was to collect additional data to:

• Further characterize groundwater and soil in areas where identified data gaps exist;

• Update and revise the CSM previously defined in the Record of Decision (ROD) [EPA 2001a]; and

• Aid in the evaluation of future remedial alternatives that will be presented in a focused feasibility study (FFS).

Goals of the investigation were to:

• Delineate the presence or absence of a dense non-aqueous phase liquid (DNAPL) coal tar body in the Plume 1 source area.

• Evaluate former site features that include vertical drains, in-ground structures, and dumping areas where release(s) of coal tar and/or chlorinated solvents may have occurred.

• Delineate the horizontal and vertical extent of volatile organic compounds (VOCs) contamination in groundwater along the northern, southern, and eastern portion of Plume 1 source area in effort to establish the 1 microgram per liter (µg/L) PCE isoconcentration line along the plume’s edge.

• Fill in data gaps in the current monitoring well network along the southern and eastern portion of the Plume 1 source area. Install monitoring wells in selected boreholes to help define the 10 µg/L isoconcentration line bounding the Plume 1 source area.

• Determine if an upgradient off-site source of shallow groundwater contamination is migrating onto the Site.

• Install a shallow monitoring well in the northwestern corner of the site to help further define the leading edge of the VOC plume.

• Collect information to update the CSM and support remedial alternative screening and analysis. This includes information on lithologic heterogeneity, ambient water quality condition, residual contaminant mass, and dissolved phase plume.

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1.2 REPORT ORGANIZATION The report is organized as follows:

• Executive Summary – presents a summary of relevant findings and conclusions

• Section 1 Introduction - summarizes goals and objectives and provides an overview of the reports organization.

• Section 2 Site Background - provides background information leading up to the investigation

• Section 3 Approach and Methods of Investigation – briefly provides methodologies for the investigation

• Section 4 Subsurface Soil Investigation Findings – presents findings in subsurface soils

• Section 5 Groundwater Investigation Findings – presents findings in groundwater

• References

• Appendices

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2. SITE BACKGROUND This section provides background information necessary to better understand the approach for meeting the goals of the investigation. NW Pipe and Casing (Site) is located between SE Lawnfield and SE Mather Roads in Clackamas County, Oregon, approximately 20 miles southeast of Portland. The Site covers approximately 53 acres of land and was divided into two parcels (Parcels A and B) for the purposes of site management. A pipe manufacturing and storage company (Northwest Pipe and Casing) operated at the Site from 1973 to 1985. During operation, soil and groundwater were impacted by contaminants that include: VOCs associated with degreasers, solvents and paints; polycyclic aromatic hydrocarbons (PAHs) a component of coal tars and transformer oil; polychlorinated biphenyls (PCBs) a component of transformer oil; and metals associated with paint and metal debris. Characterization of the nature and extent of contamination is documented in the Remedial Investigation (RI) Report (Weston 1989).

The following sections provide further information leading up to this supplemental investigation.

2.1 HYDROGEOLOGIC SETTING

Site Geology Five distinct subsurface geologic units were identified at the site:

Fill Unit. Consists of grayish brown silty gravel that was imported as fill material over much of Parcel B and portions of Parcel A. The fill unit is typically between 1 to 1.5 feet thick; however, it may be up to 5 feet thick in areas that were locally excavated. As part of the soil remedial action a two foot thick cap was placed over the majority of Parcel B after soil excavation and soil treatment.

Upper Silt Unit. Consists of grayish brown sandy silt /silt having moderate to high plasticity, with some fine gravel. The upper silt unit is encountered at a depth of 5 to 10 feet below ground surface (bgs), and is interpreted as Holocene overbank deposits and lacustrine sediments deposited by the ancestral Clackamas River.

Upper Gravel Unit. Consists of a grayish brown silty gravel in the upper portion of the unit (10 to 25 feet bgs) and grades to yellowish brown sandy gravel / gravel in the lower portion of the unit (25 to 90 feet bgs). This unit generally includes a significant amount of silt throughout. Interbedded sands and silts of various thicknesses have been noted, but do not appear to be laterally continuous. The Upper Gravel Unit is interpreted as Pleistocene catastrophic flood deposit.

Lower Silt Unit. Consists of a dense, hard, greenish gray to black gray silt. The unit is encountered between 90 feet and 110 feet bgs, and is interpreted to be an Eocene to Miocene low-energy environment deposit that may be associated with the ancestral Columbia River.

Lower Gravel Unit. Consists of sandy gravel, which is encountered at approximately 110 to 135 feet bgs. The unit is interpreted to be the Troutdale Formation or equivalent.

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Site Hydrogeology Five hydrostratigraphic units are interpreted to occur beneath the site:

• Shallow Water Bearing Zone (WBZ): corresponds to the upper portion of Upper Gravel Unit. The shallow WBZ extends from approximately 10 to 25 feet bgs, and typically yields water at rates from 2 to 10 gallons per minute (gpm).

• Intermediate WBZ: corresponds to the lower portion of the Upper Gravel Unit. The intermediate WBZ extends from approximately 25 to 45 feet bgs, and typically yields water at rates from 10 to 25 gpm.

• Deep WBZ: corresponds to the lower portion of the Upper Gravel Unit. The deep WBZ extends from approximately 45 to 90 feet bgs. Hydraulic properties of this zone have not been determined; however, they are thought to yield water at rates greater than 20 gpm.

• Confining Unit: corresponds to the Lower Silt Unit. The Confining Unit extends from 90 to 110 feet bgs. Hydraulic properties of the unit have not been determined; however, driller’s logs indicate the unit has poor water bearing properties.

• Lower Aquifer (Troutdale Gravel Aquifer equivalent): corresponds to Lower Gravel Unit, and is observed at depths greater than 100 feet bgs. The Lower WBZ is reportedly under confined conditions. The Troutdale Aquifer is an important and productive source of groundwater in the Portland Basin.

The shallow, intermediate and deep WBZs are considered to be part of the upper WBZ. The Confining Unit separates the upper WBZ from the lower aquifer. Groundwater elevations in the upper WBZ range from 100 to 106 feet National Geodetic Vertical Datum 1989 (NGVD89). Groundwater flow direction in the upper WBZ is approximately north to northwest. Natural groundwater hydraulic gradients vary seasonally and range from 1.0E-03 feet per foot (ft/ft) to 1.0E-05 ft/ft.

2.2 CHEMICALS OF CONCERN Chemicals of Concern (COCs) for soil and groundwater are summarized in Table 2-1. The table also displays the maximum concentrations of COCs observed during the RI. COCs were selected based on potential human health exposure at the site. They represent specific chemicals for which remedial action objectives (RAOs), cleanup levels, and remediation goals (RGs) were established.

The Record of Decision (ROD) for groundwater identified three VOCs as COCs: tetrachloroethene (PCE), trichloroethene (TCE), and vinyl chloride (VC). Of these COCs, PCE and TCE are primary contaminants and VC is a breakdown product resulting from biodegradation process. Other contaminants of potential concern (COPCs) such as PAHs, PCBs and metals were determined not to pose an unacceptable risk to human health or ecological receptors. Therefore, these chemicals classes were not monitored during the implementation of the groundwater remedy.

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Table 2-1. Summary of COCs in Soil and Groundwater

Maximum Detected Operable Unit Group Contaminant Concentration

Gro

und

Soil

wat

er

PCBs Total polychlorinated biphenyls (PCBs) 870 mg/kg

Tetrachlorethene (PCE) 11,000 µg/L

Tetrachloroethene (PCE) 370 mg/kg VOCs Trichloroethene (TCE) NA

Vinyl Chloride NA Benzo(a)anthracene 950 mg/kg Benzo(b)fluoranthene 800 mg/kg Benzo(k)fluoranthene 530 mg/kg

PAHs Benzo(a)pyrene 410 mg/kg Chrysene 2,100 mg/kg

Dibenz(a,h)anthracene 89 mg/kg Indeno(1,2,3-cd)pyrene 250 mg/kg

VOCs Trichloroethene (TCE) 320 µg/L

Vinyl Chloride 100 µg/L

mg/kg = milligram per kilogram µg/L = microgram per liter NA = not available

2.3 CLEAN UP LEVELS AND REMEDIAL GOALS

Soil ROD specific cleanup levels for soil-specific COCs are presented on Table 2-2. Cleanup levels for individual PAHs in soil were selected to correspond to lifetime cancer risk of 1E-06 from direct contact by trespassers, construction workers, and maintenance workers with impacted soil. Cleanup levels for PCE, TCE, and vinyl chloride in soil were selected to be protective of groundwater used in the future for drinking water by off-site residents (EPA 2000).

Table 2-2. Soil Cleanup Levels for COCs

Group Contaminant of Concern Soil Cleanup Level

VOCs Tetrachloroethene (PCE) 7 µg/kg Trichloroethene (TCE) 13 µg/kg

Vinyl Chloride 0.1 µg/kg PAHs Benzo(a)anthracene 2,500 µg/kg

Benzo(b)fluoranthene 2,500 µg/kg Benzo(k)fluoranthene 2,500 µg/kg

Benzo(a)pyrene 250 µg/kg Chrysene 250,000 µg/kg

Dibenz(a,h)anthracene 250 µg/kg Indeno(1,2,3-cd)pyrene 2,500 µg/kg

PCBs Total PCBs 1 mg/kg

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Groundwater ROD specific remedial goals (RGs) for groundwater-specific COCs are presented on Table 23. These goals were established to prevent exposure of future off-site residents and future onsite maintenance workers from direct contact (ingestion, dermal contact, and inhalation) to contaminated groundwater that would result in an excess lifetime cancer risk greater than one in a million (1E-06) for individual carcinogens, above one in one hundred thousand (1.0E-05) for additive carcinogenic contaminants, or above Hazard Quotient (HQ) of one (HQ>1) for non carcinogenic compounds (EPA 2000).

Table 2-3. Groundwater Remedial Goals for COCs

Group Contaminant of Concern Remedial Goal

VOCs Tetrachloroethene (PCE) 1 µg/L Trichloroethene (TCE) 1.6 µg/L

Vinyl Chloride 1 µg/L

2.4 REMEDIAL ACTIONS The site was divided into two operable units (OUs) to address soil (OU1) and groundwater (OU2) contamination.

The remedy for OU1 was completed in 2003. The remedy addressed the bulk of the soil contamination that was found on Parcel B. The remedial actions (RAs) included excavation, removal, treatment and capping of on-site soils (URS 2002 and 2004). Excavation and removal were conducted in six discrete excavation areas (EAs). EAs were located in areas were former plants footprints, buried piles or other site features occurred, and/or where significant contamination was present. In general, soil in these areas was: Excavated to a depth of 2 feet bgs; Stockpiled on-site, treated and used as backfill or; hauled off-site, treated and disposed at a Subtitle C or D landfill. All EAs were capped using specified material. In the supplemental investigation area, EA06 addressed soil impacts associated with former Plant 3 and Plant 4.

The remedy for OU2 addressed the four groundwater plumes that extend beneath Parcels A and B in the upper WBZ (Figure 2-1). These plumes include the following:

• Plume 1 originated near former Plant 3 and was initially estimated to be 12 acres in size (Parcel B). Groundwater concentrations of PCE in the Plume 1 source area were as high as 11,000 micrograms per liter (µg/L). The southern extent of this plume is unknown and requires further assessment.

• Plume 2 is located in the southwest corner of the site (Parcel B) and was initially estimated to be 9 acres in size. The plume has no identifiable discrete source area, but has PCE concentrations as high as 100 µg/L.

• Plume 3 is located in the southeast corner of the site (Parcel B) and was initially estimated to be 3.5 acres in size. The plume had PCE concentrations as high as 630 µg/L.

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• Plume 4 is located in the northern portion of the site (Parcel A). Commingled Plumes 1 and 4 are estimated to be 20 acres in size, and had PCE concentrations as high as 180 µg/L.

The RA for OU2 consisted of 1) installation of 15 groundwater circulation wells (GCWs) 2) monitored natural attenuation (MNA) and 3) institutional controls (ICs). The two primary functions of the GCW treatment system were to: 1) treat groundwater in plume source areas of the upper WBZ, and 2) treat groundwater in the northern downgradient boundary to prevent off-site migration.

Start-up of the GCWs treatment system was conducted in July 2003. However, operation and monitoring data indicated that the system was not effectively reducing VOC concentration and removing VOC mass. A scheduled partial shutdown of the GCW treatment system occurred in September 2006. The system was shut down completely in May 2007 after EPA determined that the GCWs were not functioning as intended (GeoTrans 2007).

2.5 INTERIM ACTIONS POST-GCWS After determining that the groundwater remedy was not functioning as intended, EPA requested that a site wide groundwater monitoring event be conducted to provide updated information on the nature and extent of groundwater contamination post-GCWs. The event was conducted in November 2007. During this event a non-aqueous phase liquid (NAPL) was discovered in monitoring well MW-207 located within the Plume 1 source area (Parametrix, 2007). The term DNAPL is used to describe the NAPL because it was observed at the bottom of the well and appeared to denser than water during sampling. However, a thin floating sheen was also observed and a minor component of the NAPL appeared to be buoyant when agitated.

Analysis of the DNAPL fraction indicated it was primarily composed of PAHs and VOCs with some PCBs and metals; and that the composition of the DNAPL fraction is similar to that of coal tar used at the site (Parametrix, 2008). Analytical results indicate elevated concentrations of chlorinated volatile organic compounds (CVOCs), aromatic compounds (BTEX), and naphthalene (benzoid) are observed in both the DNAPL and aqueous fractions (see Table 2-4). The partitioning of these compounds into the aqueous phase is likely related to their relatively high solubility compared to PAHs and PCBs.

Table 2-4. Summary of Analytical Results for the DNAPL and Aqueous Fractions from Well MW-207

Group Analyte DNAPL Fraction Aqueous Fraction

VOC

s

1,1,2 TCA (1-Methyl ethyl)-benzene 1-Methy-4-(1-methyle thyl)-benzene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 1,1 DCE cis-1,2 DCE trans-1,2 DCE Benzene Carbon Tetrachloride Ethylbenzene MP-Xylene

mg/kg

N/A

µg/L

1.3 N/A 4.0

44 J 3.0 U 1,031 J 135

200 J 24.9 N/A 3.0 710 J 522 N/A 3.3 N/A 1.2 N/A 1.0 U 252 J 102 362 J 126 J

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Group Analyte DNAPL Fraction Aqueous Fraction sec-Butylbenzene n-Butylbenzene o-Xylene Naphthalene Propylbenzene Tetrachloroethene Toluene Trans-1,3-Dichloropropene Trichloroethene Trichloromethane Vinyl Chloride

59 J N/A 84 J 1

254 J 98.4 J 21,000 J 377

121 J 14.5 1,100 J 2570

N/A 25.5 N/A 3.0 J

99 J 343 148 UJ 5.1 296 UJ 23.4

PAH

s

9H-Fluorene Acenaphthene Acenaphthylene Anthracene Benzo(a)anthracene Benxo(a)pyrene Benzo(g,h,i)perylene Benzo[b]fluoranthene Benzo[k]fluoranthene Chrysene Dibenzo[a,h]anthracene Fluoranthene Indeno(1,2,3-cd)pyrene Naphthalene Naphthalene, 2-methyl-Phenanthrene Pyrene

mg/kg

38,000

µg/L

1,000 J 2,400 J

50 UJ 86,000

180 5,600 200 J 6,100 61 J 1,000 50 UJ

170 50 UJ 1,100 50 UJ

920 50 UJ 4,100 65 J

92 50 UJ 83,000 1,200 J

50 UJ200 20,000 2,200 J

480 J12,000 170,000 3,100 J

890 J53,000 PCBs PCB-1254 mg/kg 120 µg/L 9.5

Met

als

Arsenic Barium Cadmium Chromium Copper Manganese Lead Zinc

mg/kg

38 UJ

µg/L

2,000 U 1321.5

2.6 U 1,000 8.5 U 10,000 U

43,000 28.3 4.0 J 3,520 21 U 17,000

4.3 U 65 U = not detected at or above its respective method reporting limit (MRL) J = quantity is estimated N/A = not analyzed

Based on the November 2007 groundwater monitoring results, EPA requested that a supplemental groundwater monitoring event be conducted in Spring 2008 at selected monitoring wells to characterize PAH concentrations in the vicinity and downgradient of monitoring well MW-207 (Parametrix 2008).

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Results indicated PAH contamination appeared to be limited spatially to three locations, MW-115, MW-116, and MW-207. The source of these analytes is thought to stem from coal tar sources associated with former Plant 2 and/or Plant 3. Groundwater samples collected downgradient from these locations indicated that PAH and metals impacts in groundwater are limited in extent. Based on the supplemental 2008 groundwater monitoring results, EPA requested that this supplemental site investigation be conducted to fulfill stated objectives (see Section 1).

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3. APPROACH AND METHODS FOR INVESTIGATION This section describes the approach for meeting the investigation goals and the methodologies used for field screening and analysis of soil and groundwater samples. The investigation was conducted in a manner that allowed the project team to make quick and sound decisions in the field regarding borehole location and depth, sample interval, analysis, and monitoring well placement. The methodologies used during the investigation were consistent with the Quality Assurance Project Plan (QAPP) for Supplemental Site Investigation (Parametrix 2008b).

3.1 DRILLING PROGRAM GOALS AND METHODOLOGIES The drilling program was conducted from October 15 to November 15, 2008. Drilling services were provided by Cascade Drilling, Inc., Portland, Oregon, and overseen by a Parametrix geologist registered in the State of Oregon. Activities completed included advancing 29 test borings (B-01 through B-29) to depths between 18 and 65 feet below ground surface (bgs); and the installation of 5 monitoring wells in the upper WBZ. Newly installed monitoring well and test boring locations are displayed on Figure 3-1 and Figure 32, respectively.

The drilling program utilized rotosonic drilling techniques to provide a continuous, nondisturbed 4-inch diameter soil core to selected target depths. Advantages of the rotosonic drilling techniques included: 1) the collection of representative depth-discrete soil and groundwater samples, 2) the installation of high quality monitoring wells, and 3) the minimization of investigation derived waste (IDW). A disadvantage of the drilling technique is the potential for volatilization of VOCs in soil due to heat generation.

Delineation of DNAPL Boundary A goal of the investigation was to delineate the DNAPL boundary in the Plume 1 source area. Delineation was completed using a phased or tiered approach. The tiered approach consisted of advancing a series of borings along north, south, east and west transects that intersect concentric circles centered on well MW-207. Approximately seventeen borings were advanced in this fashion to help delineate the DNAPL body (B-01 through B-12, B-21, B-22, B-24, B-26, and B-29) (Figure 3-2). The spacing between the borings ranged from 15 feet to 60 feet and was based on the presence or absence of DNAPL in soil and/or groundwater. Findings are presented in Sections 4.

Evidence of DNAPL

The following concentrations in groundwater were considered indicative of the presence of DNAPL:

• PCE 20,000 µg/L

• TCE 100,000 µg/L

• Naphthalene 30,000 µg/L

In addition, the presences or absences of DNAPL in soil and/or groundwater samples were ranked using the following system:

• 0 – no odor (Blue)

• 1 – coal tar-like odor (Green)

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• 2 – sheen (Yellow)

• 3 – NAPL globules (Orange)

• 4 – saturated with NAPL (Red)

A ranking of 3 or 4 was considered evidence of the presence of DNAPL.

Delineation of VOCs in Groundwater in the Plume 1 A goal of the investigation was to delineate the southern extent of Plume 1 by estimating the approximate 1 µg/L PCE isoconcentration line. 1 However, because VOCs impacts were more extensive than anticipated further delineation of Plume 1 to the north, east and west was necessary. This was completed to the extent practical by advancing ten test borings (B-13 through B-20, B-23, and B-28) to help define the 1, 10, 100, and 1,000 PCE isoconcentration lines. Findings are presented in Section 5.

After delineating the plume boundary, monitoring wells MW-208 through MW-211 were installed in areas where data gaps in the monitoring well network existed. The wells will be sampled as part of the November 2008 Site Wide Groundwater Monitoring Event.

Evaluation of Selected Historic Site Features During the course of the investigation, soil and groundwater data indicated that elevated concentrations of PCE and naphthalene were present in areas outside of the DNAPL boundary. These elevated concentrations were not anticipated and suggested that other source(s) of chlorinated solvents and/or coal tars maybe present in Plume 1.

The following site features were identified in the RI (Weston 1989) and during the soil removal interim remedial action measure (IRAM) (URS 2002) as potential source of coal tar and/or chlorinated solvent contamination to Plume 1 (see Figure 2-2). These features were evaluated during this investigation to the extent practical with the aid of eight test boring (B13 through B-15, B-18, B-21 through B-24, and B-28). Findings are presented in Sections 4 and 5.

Spill or Surface Releases at Former Plants 3 and 4

Spills or surface releases likely occurred within or in the vicinity of Former Plants 3 and 4. Historic evidence of surface releases at Former Plant 3 included distressed vegetation around the buildings footprint, visible coal-tar like staining of surface soil at the northwest corner of the building, and elevated photoionization detector (PID) measurements in the concrete pad area. Surface soils along the western side of Former Plant 3 were reportedly not impacted. Surface soil staining was present on the eastern side of Plant 3; however minimal contamination was noted in subsurface soil during test pitting.

Historic evidence of surface releases at Former Plant 4 included visible staining within the building footprint. Gross contamination was observed in test pits along the western edge of the plant. During demolition of Plant 4 and subsequent excavation activities conducted under the IRAM, indicated that the concrete footings debris was stained with coal tar and/or had “red” soil adhering to it. Significant coal tar impacts were also observed around a concrete slab located at the northwest corner of the Plant 4 building.

1 The RG for PCE is 1 µg/L.

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In-ground Structures

Releases from in-ground structures, and associated ancillary piping are a likely source of coal tar and chlorinated solvent contamination in the Plume 1 source area. Two in-ground structures were identified within Plant 3. The first consisted of an approximately 40-feet long and 6 feet wide structure located along the northern edge of Plant 3. The top of the structure was equipped with access ports and covered with harden coal tar. The function of the inground structure was not identified. Soil around the tank was strongly iron-oxidized. Information on the decommissioning of the tank was not available. The second in-ground structure was encountered during the removal action. It consisted of a tank located along the western edge of the Plant 3. The top of tank was approximately 5 feet bgs, 5 foot in diameter, 15-foot in length and had a volume of 2,200 gallons. The tank was composed of metal and had numerous 1-inch diameter holes cut into it. Backfill around the tank was composed of 3inch gravel, suggesting that the tank was used as a drain or for dewatering.

Vertical Drains

Two vertical drains DR-03 and DR-04 were identified in the Plume 1 source area. DR-03 was located along the southeastern corner of Plant 3. The drain consisted of a 3-foot diameter metal pipe approximately 5 feet long. The pipe contained no perforations and had a closed bottom. Backfill around the drain consisted of native material. As such DR-03 did not likely function as a drain. The pipe reportedly contained approximately 30 gallons of an oily substance. Test pitting adjacent to the drain indicated no significant impacts (Weston 1989).

DR-04 was located on the southwest corner of former Plant 4. The drain consisted of a 4-foot diameter perforated cement tile. Backfill around the drain consisted of rounded rock. No evidence of contamination was indicated in referenced reports.

Evaluation of VOCs in Up-Gradient and Off-Site Groundwater A goal of this investigation was to determine if an up-gradient off-site source of shallow groundwater contamination is migrating onto the Site. The evaluation was complete by advancing test boring B-27 along SE Mather Road and collecting and analyzing three depthdiscrete groundwater samples for VOCs. Findings are presented in Section 5.

Installation of a Shallow Monitoring Well Along the Northwest Edge of Plume 4 An additional goal of this investigation was to install a shallow monitoring well in the northwestern corner of the site to help further define the leading edge of the VOC plume. This was complete by installing shallow monitoring well MW-212 in test boring B-25. Further construction details are provided in Section 3.6. The well will be sampled as part of the November 2008 Site Wide Groundwater Monitoring Event.

3.2 SAMPLE COLLECTION The objective of the sampling program was to collect representative groundwater and soil samples for characterizing and delineating subsurface conditions.

Subsurface Soil The methodology for conducting soil sampling is described below:

• 4-inch diameter sampling cores were advanced in 10 to 20 foot runs. Soil recovery was typically greater than 80 percent.

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• Soil cores were extruded into plastic sleeves. Core sections were typically 2-feet long.

• Soil cores were laid out by depth for examination and sample collection.

• Soil samples were collected approximately every 5 feet.

• Samples were placed directly into a 2-ounce and an 8-ounce jar. All samples were logged onto a chain-of-custody and relinquished to the laboratory.

• Soil from the sample interval was placed in a zip locks baggie for headspace analysis using a photoionization detector (PID) and into an 8-ounce jar containing deionized water for a shake test to evaluate the presence or absence of NAPL using screening techniques. Results were logged into the field notebook.

• The borehole was cleared to depth using a 6-inch conductor casing prior to advancing the next core sampler run.

The soil core was logged for lithology using the unified soil classification system (USCS). Logs for test boring B-01 through B-29 are presented in Appendix A.

Groundwater Groundwater samples were collected from up to three depth-discrete intervals in each test boring. Depth intervals were selected based on the hydrostratigraphy and/or the presence/absence of contamination. In general depth discrete groundwater samples were collected from depths of 25 to 27 feet (shallow WBZ), 45 to 47 feet (intermediate WBZ), and 63 to 65 feet (deep WBZ).

The methodology for conducting groundwater sampling is described below:

• 6-inch conductor casing was advanced to target depth. The casing was pulled back 2 to 4 feet exposing the borehole wall.

• An inflatable packer connected to a 2-inch black iron pipe was placed at the bottom of the 6-inch conductor casing.

• The packer was inflated to seal off the depth discrete zone. Water levels within and outside of the annulus were measured to ensure the integrity of the seal. The seal was considered adequate if differences between the two water levels occurred and water levels outside of the annulus were not influenced by pumping.

• New clean polyethylene tubing was placed down the annulus of the 2-inch pipe to the depth-discrete interval.

• The downhole tubing was connected to a peristaltic pump. Tubing from the pump was connected to an in-line flow cell with YSI multi-meter.

• Groundwater from the depth-discrete zone was purged at a rate of approximately 0.1 liter per minute with minimal drawdown. Purge water was monitored for pH, oxidation reduction potential (ORP), dissolved oxygen, conductivity, turbidity and temperature.

• Samples were collected when water quality parameters stabilized. Note: 1) turbidity readings were typically greater than 100 Nephelometric Turbidity Units (NTU) and did not stabilize because the amount of suspended fine material. 2) If DNAPL was encountered, than water quality readings were not collected because of potential damage to the meter.

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• Groundwater samples were placed into five laboratory provided 40 milliliter vials preserved with hydrochloric acid (not preserved for natural gas analysis). All samples were logged onto a chain-of-custody and relinquished to the laboratory.

3.3 SAMPLE ANALYSIS Laboratory services were provided by Specialty Analytical, Clackamas, Oregon.

Soil Soil samples were analyzed for:

• VOCs by U.S. EPA Method 8260C with a listing of chlorinated ethenes and ethanes, aromatics hydrocarbons, and naphthalene.2

• PAHs by U.S. EPA Method 8270 selective ion method (SIM).

One hundred forty-seven soil samples were collected during the investigation. Of these, 25 samples were selected by the project team for analysis. In general soil samples were selected for analysis to characterize contaminant concentrations in DNAPL and define the vertical extent of contamination in areas where heavy impacts exist. The remaining samples were archived at the laboratory for potential analysis.

Groundwater Groundwater samples were analyzed for:

• VOCs by U.S. EPA Method 8260C with a listing of chlorinated ethenes and ethanes, aromatics hydrocarbons, and naphthalene.

• PAHs by U.S EPA Method 8270 selective ion method (SIM).

• Natural gases (methane, ethane, ethene) by ASTM D1945.

Sixty-nine groundwater samples were collected during the investigation. Of these, 68 were selected by the project team for analysis. All groundwater samples were analyzed for VOCs, with selected samples analyzed for PAHs and natural gasses in areas where heavy impacts exist.

3.4 DATA MANAGEMENT Groundwater and soil samples were submitted to Specialty Analytical for analysis at the end of each day. Upon receiving the samples, the laboratory confirmed the request for analysis using a sample receipt work order. The work order contains the sample name, laboratory identification (ID), requested analysis, submittal date, due date, and sample status. Work orders were managed by the project team throughout the investigation to ensure that the proper analyses were being conducted and for invoicing purposes.3 Sixty-three work orders were generated during this investigation. Electronic copies of work orders and chain of custodies are provided in Appendix B.

2 Because turbidity in groundwater VOCs samples exceeded 100 NTU, samples were spun on a centrifuge prior to analysis to help reduce the amount of dissolved solids in the aqueous sample.

3 Cost of analysis was dependent on turnaround time.

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For groundwater samples, preliminary VOCs analytical results were completed by the laboratory in turnaround times of 12-hours to 4 days. In general groundwater samples from a test boring were submitted at the end of the day, with preliminary results provided to the project team at the start on the following day via a portable document format (PDF). Standard turnaround times of 5 to 10 days were completed for PAHs and natural gasses preliminary results.

Final analytical results for 25 soil samples and 68 groundwater samples were provided by the laboratory in report format as PDFs and as electronic data deliverables (EDDs) as database files. The lab reports are organized numerically by work order number and are located in Appendix B. Appendix B also contains an Index Table that provides test boring ID, sample ID, laboratory ID, analysis, sample status, as well as lab report and EDD receipt confirmation information for each work order number. The table is intended to ease review of the analytical data by using work order numbers to cross-reference sample information with laboratory reports.

The analytical data are managed using a Microsoft Access™ relational database application developed for the NW Pipe project. The application links sample analytical results from EDDs to field ranking observations (0 through 4), water quality measurements (temperature, conductivity, pH, ORP, and DO), and geospatial coordinates. Standard and custom queries are used to perform analyses and generate reports and figures. The database application resides on a server dedicated to EPA project work at the Parametrix office in Auburn, Washington.

3.5 DATA VALIDATION The laboratory analytical results were validated according to QC specifications outlined in the contract laboratory program (CLP) Statement of Work (SOW) for low organic concentration analysis, and applicable parts of the EPA CLP National Functional Guidelines for Organic Data Review (EPA 2001b). The data are considered acceptable for their intended use, with the appropriate data qualifiers assigned where judged appropriate. A detailed description of data validation is presented in Appendix C.

Naphthalene can exhibit both volatile and semi-volatile characteristics due to its boiling point and vapor pressure. As a result, two methods were used to analyze naphthalene concentrations during this investigation, EPA Method 8260C (VOCs) and EPA Method 8270 SIM (PAHs). Naphthalene results from both analyses tend to agree, though variations can be seen depending on the concentration of the analyte, which can impact method efficiency.

3.6 BOREHOLE COMPLETION

Test Borings All test borings, except those selected for installation of monitoring wells, were abandoned by backfilling with bentonite grout. Test boring locations were surveyed using a Trimble hand held geographic positioning system (GPS) utilizing the National American Vertical Datum 1988 (NAVD88) High Accuracy Reference Network (HARN). A summary test boring details is displayed on Table 3-1.

Monitoring Wells New monitoring wells were installed by a well driller licensed in Oregon, with installation and construction oversight conducted by a staff geologist registered in the State of Oregon.

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New monitoring wells locations were surveyed in by W.H. Pacific, Inc., Portland, Oregon to the established monitoring well network NAVD88 datum. A summary of well construction details is provided in Table 3-2.

Monitoring wells MW-209, MW-211, and MW-212 were install in boreholes at B-12, B-17, and B-25, respectively. Because the test borings were deeper than the desired well construction, the boreholes were backfilled using pelletized bentonite chips to the appropriate depth and allowed to hydrate prior to well construction. This construction required a variance granted by the State of Oregon Water Resource Department (WRD). Boreholes were drilled to install shallow monitoring wells MW-208 and MW-210 next to their intermediate pairs MW-209 and MW-211, respectively (Figure 3-1).

Monitoring wells were developed approximately 2 weeks after installation. Well development reports are presented in Appendix D.

3.7 INVESTIGATION DERIVED WASTE (IDW)

Management and Storage Soil cuttings were moved from the drill rig using a hopper to a designated on-site waste management storage area consisting of two 13 yard drop boxes. Drop boxes were lined with plastic sheeting and secured nightly. The project team attempted to segregate visibly impacted soil from non-visibly impacted soil during drilling. Visibly impacted soil was placed in Drop Box D and non-visibly impacted soil was placed in Drop Box C.

Fifty-five gallon drums were used to store: groundwater displaced by borehole abandonment and purged during well development; decontamination water generated during washing of down-hole equipment; and sampling materials such as personal protective equipment (PPE) and polyethylene tubing. All drums are labeled and secured in a designated area. A drum inventory list describing drum contents, sampling dates, and status is currently kept by the contractor.

Sample Collection and Analysis

Soil

Composite soil samples were collected from each drop box. The composite sample was composed of four discrete soil samples collected from different areas of the drop box. Composite samples were analyzed for COCs specified in the Soil OU ROD, including VOCs by EPA Method 8260B, PAHs by EPA Method 8270SIM, and PCBs by EPA Method 8082. Laboratory services were provided by Specialty Analytical, Portland, Oregon.

Laboratory results for soil characterization are provided in Appendix E. A summary of the analytical results is displayed in Table E-1. Chemical concentrations were compared to soil COCs threshold criteria for disposal referenced in the Site Waste Management Plan or Region 9 Preliminary Remedial Goals (PRGs) if no criteria existed. Table E-1 indicates that COCs in soil cuttings were not detected at or above threshold criteria.

Water

Sampling and analysis of drummed water will be conducted during the upcoming November 2008 Site Wide Groundwater Monitoring Event. This event generates up to five drums of purge water. As such, all drummed water will be managed together to reduce the overall effort in this task.

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Characterization and Disposal Soil analytical results indicated that analyte concentrations are below concentrations considered to be characteristic waste. EPA has determined that on-site waste is not considered a listed waste (EPA 2000). As such, soil cuttings were disposed at Waste Management Subtitle D Hillsboro Landfill, Hillsboro, Oregon. Hauling services were provided by West Coast Marine Environmental, Vancouver, Washington. Profile sheet, waste manifests and disposal agreement are provided in Appendix E.

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4. SUBSURFACE SOILS INVESTIGATION FINDINGS This section presents findings for soil, and discusses the nature and extent of soil contamination associated with DNAPL impacts. The findings presented below help satisfy the goals of the investigation outlined in Section 3.1.

4.1 DELINEATION OF THE DNAPL BOUNDARY

Field Observations The ranking system presented in Section 3 was used to help define the boundary of the DNAPL body, where rankings of 3 or 4 were considered evidence of DNAPL. A ranking of 3 indicated residual DNAPL coating portions of the soil media (typically sand and gravel size particles), where a ranking of 4 indicated more saturated conditions existed. The DNAPL appeared to be petroleum based and is presumably composed of coal tar. Distinction between sheen (ranking of 2) and residual DNAPL (a ranking of 3) was made to the extent practical. A ranking of 1 typically indicated that a strong naphthalene-like odor existed. Elevated PID measurements correlated with rankings of 3 or higher. A summary of soil rankings and PID results are presented in Table 4-1.

A schematic of the DNAPL boundary is displayed on Figure 4-1. The figure displays rankings of 3 and 4 as hot colors (orange and red), rankings of 0 and 1 as cool colors (blue and green), and a ranking of 2 as a warm color (yellow). The figure indicates that three discrete DNAPL bodies were identified during the investigation. These consist of a main DNAPL body, and two smaller bodies that are east of the main body. The approximate boundaries of these bodies were interpreted between borehole locations. As such, boundaries of the DNAPL bodies are approximations.

In the main DNAPL body, DNAPL was encountered between 6 and 12 feet bgs at test borings B-06 through B-09; Encountered between 14 and 16 feet bgs at test borings B-05 B10, B-11 and B-29; and encountered between 20 and 25 feet bgs at test borings B-02 and well MW-207. The thickness of the DNAPL appeared to be greatest at test borings B-06 through B-08 with an approximate thickness of 16 feet (Table 4-1). This distribution suggests that the source of the main DNAPL body may have stemmed in the vicinity of test boring B-06 through B-09.

The two smaller DNAPL bodies appear to be discontinuous with each other based on observations at test boring B-15. The DNAPL body at test borings B-13 and B-14 is thought to be more significant than the body at test boring B-16. DNAPL was encountered at test borings B-13 and B-14 between 13 and 20 feet bgs, with an approximate thickness of 7 feet. DNAPL was encountered at test boring B-16 at 12 feet bgs, with an approximate thickness of 2 feet (Table 4-1).

Analytical Results In effort to further delineate the DNAPL bodies selected soil samples were analyzed to characterize contaminant concentrations and define the vertical extent of compounds in areas where heavy impacts exist. For the purposes of comparison, cleanup goals for soil are provided on analytical summary tables for COCs.

VOCs

Analytical results for VOCs in soil collected during the investigation are summarized on Table 4-2. The table indicates that chlorinated VOCs (CVOCs), naphthalene, and BTEX

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compounds were detected at or above their respective method reporting limit (MRL) in one or more of the soil samples. The highest concentrations of these compounds are observed at approximately 15 feet bgs in test borings B-06 through B-09, and B-29. High concentrations of PCE (7,280 microgram per kilogram [µg/kg]), TCE (547 µg/kg), cis 1,2-DCE (1,620 µg/kg), naphthalene (115,000 µg/kg), and BTEX in soil from these borings is consistent with field observations regarding the location of the source of the main DNAPL body. PCE and TCE concentrations exceed site cleanup goals for soil.

Field observations also suggest that test borings B-02, B-05, B-10 and B-11 are located outside of the source of the main DNAPL body. This is supported by analytical results, where soil samples from these borings have significantly lower concentrations of naphthalene (778 µg/kg), CVOCs (non detect), and BTEX (non detect).

Within the main DNAPL body, deeper soil samples collected between 45 and 65 feet bgs had concentrations of CVOCs and BTEX that were below their respective MRLs. However, naphthalene concentrations although reduced in deeper soil samples were detected above its MRL. The distribution CVOCs and BTEX in soils suggests that much of the contaminant mass associated with these compounds is bound near the source of the main DNAPL body. This is in contrast to naphthalene, which is more pervasive throughout the main DNAPL body.

A similar distribution of CVOCs, naphthalene, and BTEX compounds is observed in the smaller DNAPL body to the east. Soils collected at 15 feet bgs from test borings B-13 and B14 have relatively high concentrations of PCE (554 µg/kg), TCE (20.8 µg/kg), cis 1,2-DCE (40.2 µg/kg ), naphthalene (27,000 µg/kg), and BTEX. The concentrations of these compounds are significantly reduced in deeper soil samples collected at test boring B-14 between 45 and 65 feet bgs. Similar to the main DNAPL body, CVOC and BTEX concentrations were not detected in deeper soils above their respective MRLs; however, naphthalene was detected above its MRL in deeper soils.

PAHs

Analytical results for PAHs in soil collected during the investigation are summarized on Table 4-3. The table indicates that PAHs were detected at or above their respective MRLs in one or more of the soil samples. The highest concentrations of PAHs are at approximately 15 feet bgs in test boring B-06 through B-09, and B-29; and include, but not limited to: benzo(a)anthracene (44,100 µg/kg), benzo(a)pyrene (6,070 µg/kg), benzo(b)fluoranthene (6,200 µg/kg), benzo(k)fluoranthene (6,730 µg/kg), chrysene (35,000 µg/kg), and fluoranthene (371,000 µg/kg). These compounds exceed their respective site soil cleanup goals, if applicable.

High concentrations of PAHs in soil from these test borings are consistent with field observations and VOC analytical results in regards to the location of the source of the main DNAPL body. This is also supported by significantly lower concentrations of PAHs in test borings B-02, B-05, B-10 and B-11. The highest PAHs concentrations at these borings include, but are not limited to, benzo(a)anthracene (3,290 µg/kg), benzo(a)pyrene (527 µg/kg), benzo(b)fluoranthene (544 µg/kg), benzo(k)fluoranthene (620 µg/kg), chrysene (2,840 µg/kg), and fluoranthene (27,200 µg/kg).

Elevated concentrations of PAHs are also observed in soil from test boring B-13 and B-14. Concentrations of PAHs in soil at these borings typically are not as high as those observed in the main DNAPL body.

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4.2 EVALUATION OF SELECTED SITE FEATURES The distribution of DNAPL based on field observations and analytical results for soil suggest that the main DNAPL body is located within the approximate footprint of Former Plant 3. The source of the main DNAPL body may stem from former features in this portion of the Plant 3, which include, but not limited to, the two in-ground structures and the southeast concrete pad area (see Figure 3-2).

The two smaller DNAPL bodies are located within the approximate footprint of Former Plant 4. These DNAPL bodies may stem from former features in this portion of Plant 4, which include the northwest concrete pad area and drain DR-04.

4.3 SUMMARY • Three DNAPL bodies, a main body and two smaller bodies reside in the Plume 1

Source Area. These DNAPL bodies are presumably composed of coal tars. The main DNAPL body likely originates near test boring B-06 through B-08. DNAPL was encountered in the main DNAPL body at a depth of 6 feet bgs, with an approximate maximum saturated thickness of 16 feet. The two smaller DNAPL bodies are centered at B-13 and B-14, and at B-16, respectively. DNAPL was encountered in these bodies at an approximate depth of 12 feet bgs, with a maximum saturated thickness of 7 feet and 2 feet, respectively. See Figure 3-2 & Table 4-1.

• Analytical results for soils collected within the DNAPL bodies indicates relatively high concentrations of chlorinated volatile organic compounds (CVOCs), naphthalene, and BTEX (benzene, toluene, ethylbenzene, xylene). In general CVOCs and BTEX concentrations in subsurface soil are limited in extent both laterally and vertically within the DNAPL bodies. However, naphthalene concentrations in subsurface soil are more pervasive throughout the DNAPL bodies, with detectable concentrations up to 65 feet bgs. See Table 4-1.

• The distribution of DNAPL based on field observations and analytical results for soil suggest that the main DNAPL body is located within the approximate footprint of Former Plant 3. The source of the main DNAPL body may stem from former features in this portion of the Plant 3, which include, but are not limited to, the two in-ground structures and the southeast concrete pad area. The two smaller DNAPL bodies are located within the approximate footprint of Former Plant 4. These DNAPL bodies may stem from former features in this portion of Plant 4, which include the northwest concrete pad area and drain DR-04. See Figure 3-2.

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5. GROUNDWATER INVESTIGATION FINDINGS This section presents the findings and discusses the nature and extent of groundwater contamination in Plume 1 Source Area. In addition, this section also presents the findings for groundwater collected at an up-gradient and off-site test boring. The findings presented below help satisfy the goals for the investigation outlined in Section 3.1.

5.1 ANALYTICAL RESULTS Test boring analytical results for VOCs and PAHs in groundwater are summarized in Tables 5-1 and 5-2. For the purposes of comparison, remedial goals (RGs) are presented on the tables for chemicals of concern (COCs). Water quality field measurements are presented on Table 5-3.

5.2 DELINEATION OF VOCS IN GROUNDWATER IN THE PLUME 1 SOURCE AREA

Groundwater contamination in the Plume 1 Source Area was delineated using the aid of isoconcentration maps. Isoconcentration maps were constructed by contouring lines of equal concentrations for depth discrete and monitoring groundwater samples.4 Isoconcentration lines consisted of 1 microgram per liter (µg/L), 10 µg/L, 100 µg/L and 1,000 µg/L, where applicable. Maps were completed for PCE, TCE, cis 1,2-DCE, and naphthalene for the shallow, intermediate, and deep WBZs. In addition, VC concentrations are posted on the cis 1,2-DCE maps.

For purposes of this report:

• The Plume 1 Source Area is defined by the presence of DNAPL and/or PCE concentrations in groundwater greater than 100 µg/L (micrograms per liter) (100 times the RG).

• Hot spots within the Plume 1 Source Area are defined as concentrations greater than PCE concentrations greater than 1,000 µg/L (1,000 times the RG).

• The boundary of the Plume 1 Source Area is defined as PCE concentrations equal to greater than 1.0 µg/L (RG).

These definitions are for descriptive purposes and are based on the understanding that PCE is the primary COC in Plume 1.

Shallow WBZ

PCE Isoconcentration Map - Figure 5-1

PCE concentrations in groundwater are greater than 1,000 µg/L in the Shallow WBZ. The map displays two PCE hot spot areas north of the DNAPL bodies. Although the PCE hot spot areas have or likely will commingle these areas are shown as two separate hot spots based on review of soil and groundwater analytical data.

4 Results are from the November 2007 Groundwater Site Monitoring Event.

February 23, 2009 │ 415-2328-007 5-1


The 100 µg/ PCE isoconcentration line is used to display the approximate boundaries of the Plume 1 Source Area in the Shallow WBZ. The map indicates that 100 µg/L isoconcentration line extends to the north along the direction of groundwater flow.

The 1 µg/L PCE isoconcentration line is used to help define the boundary of Plume 1 in the Shallow WBZ. The map displays the southern boundary of Plume 1 as being separate from Plume 3. However these plume boundaries have or likely will commingle with time. The eastern boundary of Plume 1 for the Shallow WBZ extends to the property line. The eastern boundary will be more clearly defined based on groundwater analytical results from newly installed monitoring well MW-210 conducted as part of the November 2008 site wide groundwater monitoring event.

TCE Isoconcentration Map - Figure 5-2

TCE concentrations in groundwater are greater than 1,000 µg/L in the Shallow WBZ. The map displays a TCE hot spot area north of the smaller DNAPL body. TCE concentrations greater than 1,000 µg/L are not observed within or north of the main DNAPL body.

Similar to the PCE isoconcentration map, the 100 µg/L TCE isoconcentration line extends to the north along the direction of groundwater flow. The 1.6 µg/L TCE isoconcentration line is used to help define the boundary of Plume 1 in the Shallow WBZ. This boundary is similar to that of the PCE.

Cis 1,2-DCE Isoconcentration Map with Posted VC Concentrations - Figure 5-3

Cis 1,2-DCE concentrations in groundwater are greater than 1,000 µg/L in the Shallow WBZ. The map displays two cis 1,2-DCE hot spot areas north of the DNAPL bodies. The map indicates that highest concentration of VC (129 µg/L) is observed at boring B-18 within the eastern hot spot area. Detectable concentrations of VC are observed within and north of the DNAPL bodies.

The 100 µg/L cis 1,2-DCE isoconcentration line is similar to that of PCE and TCE, except that it likely extends further to the north based on the November 2007 monitoring well data.

Naphthalene Isoconcentration Map - Figure 5-4

Naphthalene concentrations in groundwater are greater than 1,000 µg/L in the Shallow WBZ. Two naphthalene hot spots areas are co-located with the main DNAPL body and the smaller DNAPL body to the east. The map indicates that the naphthalene plume associated with these two DNAPL bodies has commingled as shown by the 100 µg/L isoconcentration line.

The 1.0 µg/L isoconcentration line is used to help define the boundary of the naphthalene plume in the Shallow WBZ. The map indicates that the naphthalene plume appears to have attenuated in close proximity to the DNAPL bodies.

Other PAHs - Table 5-2

Table 5-2 indicates that other PAH compounds were detected at relatively high concentrations in groundwater from the Shallow WBZ at B-13. These include but are not limited to, benzo(a)anthracene (6,470 µg/L), benzo(a)pyrene (1,120 µg/L), benzo(b)fluoranthene (1,150 µg/L), benzo(k)fluoranthene (1,010 µg/L), chrysene (5,840 µg/L), and fluoranthene (73,100 µg/L).

February 23, 2009│ 415-2328-007 5-2



Intermediate WBZ


In general lower concentrations of PCE are observed in groundwater in the Intermediate WBZ than in the Shallow WBZ. PCE concentrations greater than 1,000 µg/L s are located within and north of the smaller eastern DNAPL body. PCE concentrations greater than 1,000 µg/L are not observed within or north of the main DNAPL body.

The 100 µg/L PCE isoconcentration line is used to display the approximate boundaries of the Plume 1 Source Area in the Intermediate WBZ. The figure indicates that 100 µg/L isoconcentration line extends to the north along the direction of groundwater flow.

The 1 µg/L PCE isoconcentration line is used to help define the boundary of Plume 1 in the Intermediate WBZ. The figure displays the southern boundary of Plume 1 as being separate from Plume 3. The eastern boundary of Plume 1 for the Intermediate WBZ extends to the property line. The eastern boundary will be more clearly defined based on groundwater analytical results from newly installed monitoring well MW-211 conducted as part of the November 2008 site wide groundwater monitoring.


In general lower concentrations of TCE are observed in groundwater in the Intermediate WBZ than in the Shallow WBZ, with TCE concentrations less than 1,000 µg/L. TCE concentrations greater than 100 µg/L are observed within the main DNAPL body and in the northern portion of the Plume 1 Source Area. The boundary of the TCE plume in the Intermediate WBZ extends south and east similar to that of PCE.

Cis 1,2-DCE Isoconcentration Map with Posted VC Concentrations – Figure 5-7

In general lower concentrations of cis 1,2-DCE and VC are observed in groundwater in the Intermediate WBZ than in the Shallow WBZ, with cis 1,2-DCE concentrations less than 1,000 µg/L and VC concentrations less than 100 µg/L.

The map indicates that 100 µg/L cis 1,2-DCE isoconcentration line extends north from the DNAPL bodies. This helps reinforce the concept that at least two separate source areas of CVOCs may have occurred. In general higher concentrations of cis 1,2-DCE and VC are thought to be present in the northern portion of the Plume 1 Source Area.


Naphthalene concentrations in groundwater are greater than 1,000 µg/L in the Intermediate WBZ. Two naphthalene hot spots are co-located with the main DNAPL body and the smaller DNAPL body to the east. Isoconcentration lines for the Intermediate WBZ are similar to those for the Shallow WBZ.

Deep WBZ


Lower concentrations of PCE are observed in groundwater in the Deep WBZ than in the Intermediate WBZ. PCE concentrations greater than 1,000 µg/L are located generally within and north of the smaller eastern DNAPL body. PCE concentrations greater than 1,000 µg/L are not observed within or north of the main DNAPL body.

February 23, 2009 │ 415-2328-007 5-3


The 1.0 µg/L PCE isoconcentration line extends to the north along the direction of groundwater flow. The line suggests that the footprint of the PCE plume in the Deep WBZ is smaller than that of the Intermediate WBZ.


Lower concentrations of TCE are observed in groundwater in the Deep WBZ than in the Intermediate WBZ. TCE concentrations are less than 100 µg/L. The 1.6 µg/L TCE isoconcentration line extends to the north along the direction of groundwater flow. The line suggests that the footprint of the TCE plume in the Deep WBZ is smaller than that of the Intermediate WBZ.

Cis 1,2-DCE Isoconcentration Map with Posted VC Concentrations - Figure 5-11

Lower concentrations of cis 1,2-DCE and VC are observed in groundwater in the Deep WBZ than in the Intermediate WBZ. cis 1,2-DCE concentrations are less than 1,000 µg/L and VC concentrations are less than 10 µg/L. Cis 1-,2 DCE concentrations greater than 100 µg/L are located north of the smaller DNAPL body.

The 1.0 µg/L cis 1,2-DCE isoconcentration line extends to the north along the direction of groundwater flow. The line suggests that the footprint of the cis 1,2-DCE plume in the Deep WBZ is smaller than that of the Intermediate WBZ.


Lower concentrations of naphthalene are observed in groundwater in the Deep WBZ than in the Intermediate WBZ. Naphthalene concentrations greater than 1,000 µg/L are located within and east of the main DNAPL body. However, naphthalene concentrations greater than 1,000 µg/L are not observed within or north of the smaller DNAPL body. The 1.0 µg/L naphthalene isoconcentration line extends around the DNAPL bodies. The map indicates that the naphthalene plume appears to have attenuated in close proximity to the DNAPL bodies.

Other PAHs - Table 5-2

Table 5-2 indicates that other PAHs compounds were detected at significantly lower concentrations in groundwater from the Deep WBZ than the Shallow WBZ. The highest concentrations of these PAHs compounds are at B-07 within the main DNAPL body.

5.3 WATER QUALITY PARAMETERS AND NATURAL GASSES Water quality parameters were collected to help define geochemical condition in the Plume 1 Source Area. A summary of Water Quality parameters is presented on Table 5-3.

The table indicates:

• pH ranged from 6.2 to 8.0 pH units (a pH of 5 to 9 is the optimal range for biodegradation to occur)

• Oxidation Reduction Potential (ORP) ranged from 66.3 to -632.8 millivolts (mV)(less than 50 mV suggests reductive pathway is possible)

• DO ranged from 0.02 to 5.05 milligram per liter (mg/L) indicating that anaerobic conditions occur. Anaerobic conditions are required for biodegradation to occur for PCE.

February 23, 2009│ 415-2328-007 5-4



Water quality parameters suggest that geochemical conditions in the Plume 1 Source Area are suitable for CVOC biodegradation to occur.

Natural gasses were analyzed in groundwater at 27 feet bgs from test boring B-06 to assess potential degradation of CVOCs in the Plume 1 Source Area. The following natural gasses were detected:

• Methane at a concentration of 5,000 µg/L

• Ethane at a concentration of 100 µg/L

• Ethene was not detected at or above its MRL

• Carbon Dioxide at a concentration 44,000 µg/L

Presence of methane indicates that methanogenesis is occurring in this portion of the plume. The occurrence of natural gasses, suitable geochemical conditions, and presence of degradation products cis 1,2-DCE and VC suggest that biotic and abiotic degradation of PCE and TCE is occurring in the Plume 1 Source Area. Further evaluation of the extent, rate and completeness of degradation process will be necessary for assessing future remedial action at the Site.

5.4 EVALUATION OF UPGRADIENT AND OFF-SITE GROUNDWATER FOR VOCS

Test boring B-27 was advanced at an off-site upgradient location to evaluate potential VOCs impacts migrating onto the Site (Figure 3-1). Analytical results for VOCs in groundwater collected at 27 feet, 47 feet and 65 feet bgs from B-27 are summarized on Table 5-1. The table indicates that only TCE (1.46 µg/L) and cis 1,2-DCE (1.78 µg/L) were detected above their respective MRLs in groundwater collected at 27 feet bgs. Analytical data suggests that it unlikely that VOCs from an upgradient off-site source are migrating onto the site. Based on these results the project team did not install a monitoring well at this location.

5.5 SUMMARY AND RECOMMENDATION • Analytical results for CVOCs and naphthalene from depth-discrete groundwater

samples indicate that high concentrations of these compounds encompass and/or extend from identified DNAPL bodies along the direction of groundwater flow. PCE, TCE, cis 1,2-DCE and naphthalene concentrations greater than 1,000 µg/L are observed within and/or north of the DNAPL bodies in the Shallow and Intermediate WBZs. Lower CVOCs, naphthalene, and BTEX concentrations in groundwater are observed in the Deep WBZ than the Shallow and Intermediate WBZs. However, PCE and naphthalene concentrations greater than 1,000 µg/L are observed in the Deep WBZ, to a limited extent. Groundwater analytical results are consistent with field observations and soil analytical results regarding contaminant source areas. See Figures 5-1 through 5-12.

• Analytical results for PCE, TCE and cis 1,2-DCE indicate that the extent of these compounds is more pervasive in groundwater in the Shallow, Intermediate and Deep WBZs relative to naphthalene. Naphthalene appears to have attenuated in groundwater within a short distance of the DNAPL bodies. See Figures 5-1 through 5-12.

• Water quality parameters suggest that the geochemical conditions in Plume 1 are suitable for biotic and abiotic degradation of PCE and TCE. This is supported by the

February 23, 2009 │ 415-2328-007 5-5


presence of methane suggesting that methanogenesis is occurring in a portion of the plume, and the presence of degradation products cis 1,2-DCE and VC.

• Analytical results from depth-discrete groundwater samples collected at the upgradient and off-site location suggest that CVOCs contamination is not migrating onto the Site.

Recommendations:

The conceptual site model (CSM) should be updated using the results from this investigation and the November 2008 site wide groundwater monitoring event. The goal of the updated CSM is to support decision-making approach for the analysis and selection of future remedial actions; and support remedial design. The remedy may include enhanced attenuation, source control measures, and institutional controls. As such, the CSM should present a comprehensive discussion of hydrogeology, nature and extent of contamination, risk-pathway assessment, estimate of source and plume mass, and evaluation of plume stability. In addition, the CSM should provide a discussion on uncertainties or data gaps within the CSM that may affect the decision-making approach.

February 23, 2009│ 415-2328-007 5-6



6. REFERENCES

EPA. 2000. Record of Decision, Operable Unit 1, Northwest Pipe and Casing. June 2000.

_____. 2001. Record of Decision Operable Unit 2, Northwest Pipe and Casing. September 2001.

_____. 2004. Explanation of Significant Differences – Operable Unit 1, Northwest Pipe and Casing / Hall Process Company, Clackamas County Oregon. March 23, 2004.

_____. 2005. Waste Management Plan, Northwest Pipe and Casing / Hall Process Company, Clackamas County, Oregon.

GeoTrans. 2007. Remedial System Evaluation Report. Prepared for U.S Environmental Protection Agency. May 9.

Parametrix. 2006. Five Year Review Report, Northwest Pipe and Casing, Clackamas, Oregon. Prepared for the U.S. Environmental Protection Agency. September 2006.

Parametrix. 2008. Site Wide Groundwater Monitoring Report – November 2008 through June 2008, Northwest Pipe and Casing Site, Clackamas, Oregon. July, 25, 2008.

URS Corporation. 2002. Interim Remedial Action Report, Northwest Pipe and Casing / Hall Process Company Superfund Site Operable Unit 1. Prepared for US Environmental Protection Agency. March 2002.

_____. 2004. Combined Final Remedial Action Report for OU1 – Soil and Interim Remedial Action Report for OU2 – Groundwater. Prepared for US Environmental Protection Agency by URS Corporation. August 2004.

Weston. 1998. Remedial Investigation Report, Northwest Pipe and Casing / Hall Process Company. Prepared for US Environmental Protection Agency. August 1998.

February 23, 2009 │ 415-2328-007 6-1



February 23, 2009│ 415-2328-007 6-2

APPENDIX A

Test Boring Logs

APPENDIX B

Laboratory Results CD/ROM

APPENDIX C

Data Validation Report

APPENDIX D

Well Development Reports

APPENDIX E

Investigation Derived Waste Results

MW-112MW-112

CMT-7

MW-130 MW-05

MW-207

MW-04

MW-206MW-206

MW-205MW-205 MW-210MW-210MW-211MW-211

MW-18MW-18 MW-14MW-14

MW-208 MW-209

MW-118

MW-117

MW-205MW-205

MW-14 MW-206 MW-18

MW-04

MW-207 MW-112MW-112

MW-211

MW-210

MW-209 MW-208

Parametrix LEGEND RANKING

4@ Monitoring well? 3

@ Test boring? 2 Footprint of observed 1 NAPL in shallow WBZ 0

Figure 4-1 Field Ranking Observations and Approximate DNAPL Boundaries

Table Notes Fall 2008 Supplemental Investigation

Acronyms and Abbreviations bgs = below ground surface BTC = below top of casing

CMT-60 = Continuous Multichannel TubingTM well identiifcation - top of well screen depth in feet BTC Cond = conductivity measured in uS/cm DTW = depth to water dup = duplicate sample hold = sample submitted for possible follow up analysis ID = identification Low Flow = Low flow purge and sampling MS = matrix spike MSD = matrix spike duplicate NAVD88 = North American Vertical Datum 1988 NI = not installed NM = not measured NTU = nephelometric units ORP = oxidiation reduction potential measured in mV PAHs = polycyclic aromatic hydrocarbons PCBs = polychlorinated biphenyls PCE = tetrachloroethene QA/QC = quailty assurance / quality control RG = Remedial Goal TCE = trichloroethene Temp = Temperature in degrees C TOC = top of well casing Turbidity = measured in NTUs USEPA = U.S. Environmental Protection Agency VC = vinyl chloride VOCs = volatile organic compounds WBZ = water bearing zone X = completed -- = does not apply / not analyzed

Analysis VOC Analyzed by EPA Method 8260C PAHs Analyzed by EPA Method 8270 SIM Water Quality Parameters include field testing for pH, ORP, conductivity, turbidity and temperature

Units ºC = degrees Celsius mg/L = milligrams per liter ug/L = micrograms per liter ug/L = micrograms per kilogram uS/cm = microsiemens per centimeter. nmV = millivolts NTUs = nephelometric turbidity units

Qualifiers D = The reported result is from a dilution.

J = the result for this analyte is between the method detection limit and the method reporting limit, and should be considered an estimated concentration

U = not detected at or above the method reporting limit UJ = The analyte was not detected at or above the reported estimated result

Table 3-1 Test Boring Details Supplemental Field Investigation, Fall 2008

Test Boring ID Total Depth (feet bgs)

Northing Easting Status

B-01 65.0 644601.88 7671951.65 Abandoned B-02 65.0 644566.92 7671931.38 Abandoned B-03 65.0 644583.95 7671894.99 Abandoned B-04 65.0 644625.89 7671916.08 Abandoned B-05 65.0 644553.89 7671937.27 Abandoned B-06 65.0 644533.32 7671942.41 Abandoned B-07 65.0 644514.67 7671949.14 Abandoned B-08 26.0 644495.78 7671956.58 Abandoned B-09 27.0 644477.62 7671961.64 Abandoned B-10 27.0 644457.39 7671967.97 Abandoned B-11 27.0 644437.74 7671974.17 Abandoned B-12 65.0 644411.47 7671982.19 MW-209 installed B-13 65.0 644627.27 7672123.46 Abandoned B-14 65.0 644644.53 7672169.19 Abandoned B-15 65.0 644567.58 7672194.03 Abandoned B-16 49.0 644476.82 7672173.19 Abandoned B-17 65.0 644651.39 7672271.64 MW-211 installed B-18 65.0 644736.30 7672131.87 Abandoned B-19 65.0 644828.54 7672096.00 Abandoned B-20 65.0 644923.24 7672064.20 Abandoned B-21 57.0 644574.28 7672009.50 Abandoned B-22 64.0 644482.49 7672038.72 Abandoned B-23 65.0 644616.04 7671816.24 Abandoned B-24 65.0 644462.40 7671861.82 Abandoned B-25 18.0 645611.67 7670930.08 MW-212 installed B-26 27.0 644503.24 7671984.79 Abandoned B-27 65.0 644032.49 7672640.59 Abandoned B-28 47.0 644666.48 7671976.89 Abandoned B-29 27.0 644486.97 7671926.76 Abandoned

EPA R-10 AES 1/7/2008 NW Pipe and Casing well construction.xls

Table 3-2 New Well Construction Details Supplemental Field Investigation, Fall 2008

Well ID Water

Bearing Zone Northing Easting TOC

Elevation Ground

Elevation

Depth of Well (log

ft bgs)

Depth of Well from TOC

(measured) Screen Length

Top of Screen (ft bgs)

Bottom of

Screen (ft bgs)

Top of Screen

Elevation (NAVD 88)

Bottom of Screen

Elevation (NAVD 88)

Wells Completed in the Shallow Water Bearing Zone

MW-208 Shallow 644414.10 7671990.07 112.47 111.94 18.00 NM 5 13.00 18.00 99.47 94.47 MW-210 Shallow 644643.73 7672275.48 111.93 111.52 27.00 NM 5 22.00 27.00 89.93 84.93 MW-212 Shallow 645611.67 7670930.08 102.35 102.80 25.00 NM 5 20.00 25.00 82.35 77.35 Wells Completed in the Intermediate Water Bearing Zone

MW-209 Intermediate 644411.68 7671982.76 112.40 112.02 45.00 NM 5 40.00 45.00 72.40 67.40 MW-211 Intermediate 644650.85 7672272.81 111.95 111.56 45.00 NM 5 40.00 45.00 71.95 66.95

EPA R-10 AES 1/7/2008 NW Pipe and Casing well construction.xls

Table 4-1 Field Ranking Observations and PID Measurements for Soil Supplemental Field Investigation, Fall 2008

Test Boring

Sample Name Depth Northing Easting Rank PID (ppm)

B-01-SS-5.0 5 644601.88 7671951.65 0 0 B-01-SS-10.0 10 644601.88 7671951.65 0 0 B-01-SS-15.0 12 644601.88 7671951.65 0 0 B-01-SS-20.0 20 644601.88 7671951.65 0 0 B-01-SS-21.5 21.5 644601.88 7671951.65 1 9.8 B-01-SS-25.0 25 644601.88 7671951.65 2 0

B-01 B-01-SS-30.0 30 644601.88 7671951.65 2 9 B-01-SS-35.0 35 644601.88 7671951.65 1 0 B-01-SS-40.0 40 644601.88 7671951.65 0 0 B-01-SS-45.0 45 644601.88 7671951.65 0 0 B-01-SS-50.0 50 644601.88 7671951.65 0 0 B-01-SS-55.0 55 644601.88 7671951.65 0 0 B-01-SS-61.0 61 644601.88 7671951.65 0 0.5 B-02-SS-7.7 7.7 644566.92 7671931.38 0 0 B-02-SS-14.0 14 644566.92 7671931.38 0 0 B-02-SS-16.0 16 644566.92 7671931.38 0 0 B-02-SS-20.0 20 644566.92 7671931.38 0 0 B-02-SS-21.2 21.2 644566.92 7671931.38 2 3.8 B-02-SS-25.0 25 644566.92 7671931.38 3 14.6

B-02 B-02-SS-28.5 B-02-SS-35.0

28.5 35

644566.92 644566.92

7671931.38 7671931.38

0 1

0 1.7

B-02-SS-43.0 43 644566.92 7671931.38 0 0.2 B-02-SS-47.0 47 644566.92 7671931.38 2 2.2 B-02-SS-51.0 51 644566.92 7671931.38 0 0 B-02-SS-55.0 55 644566.92 7671931.38 0 0 B-02-SS-60.0 60 644566.92 7671931.38 0 0 B-02-SS-65.0 65 644566.92 7671931.38 0 0 B-03-SS-10.0 10 644583.95 7671894.99 0 0 B-03-SS-15.0 13 644583.95 7671894.99 0 0 B-03-SS-20.0 20 644583.95 7671894.99 0 0 B-03-SS-25.0 25 644583.95 7671894.99 0 3.6 B-03-SS-30.0 30 644583.95 7671894.99 0 0 B-03-SS-35.0 35 644583.95 7671894.99 0 0

B-03 B-03-SS-39.0 39 644583.95 7671894.99 0 0 B-03-SS-42.0 42 644583.95 7671894.99 0 0 B-03-SS-45.0 45 644583.95 7671894.99 0 0 B-03-SS-51.7 51.7 644583.95 7671894.99 0 3.4 B-03-SS-55.0 53 644583.95 7671894.99 0 0 B-03-SS-61.0 61 644583.95 7671894.99 0 0 B-03-SS-65.0 63 644583.95 7671894.99 0 0.5 B-04-SS-10.0 10 644625.89 7671916.08 0 0 B-04-SS-15.0 15 644625.89 7671916.08 0 0 B-04-SS-21.0 21 644625.89 7671916.08 0 0.1 B-04-SS-25.0 25 644625.89 7671916.08 0 2.1 B-04-SS-29.0 29 644625.89 7671916.08 0 1.4 B-04-SS-31.0 31 644625.89 7671916.08 0 0

B-04 B-04-SS-35.0 35 644625.89 7671916.08 0 0 B-04-SS-39.5 39.5 644625.89 7671916.08 0 0

EPA R-10 AES Contract 1/7/2009 NW Pipe and Casing 1 FieldParmtrsDepDisSoilSamples.xls


Test Boring


B-04-SS-45.0 45 644625.89 7671916.08 0 0 B-04-SS-51.0 51 644625.89 7671916.08 0 0 B-04-SS-54.0 54 644625.89 7671916.08 0 0 B-04-SS-60.0 60 644625.89 7671916.08 0 0 B-04-SS-65.0 65 644625.89 7671916.08 0 0 B-05-SS-8.0 8 644553.89 7671937.27 0 0 B-05-SS-12.0 12 644553.89 7671937.27 2 0.4 B-05-SS-14.0 14 644553.89 7671937.27 4 0.4 B-05-SS-16.0 16 644553.89 7671937.27 4 1 B-05-SS-17.0 17 644553.89 7671937.27 4 2.4 B-05-SS-20.8 20.8 644553.89 7671937.27 4 12.9 B-05-SS-22.0 22 644553.89 7671937.27 2 8

B-05 B-05-SS-25.0 B-05-SS-30.0

25 30

644553.89 644553.89

7671937.27 7671937.27

1 1

0.9 1.2

B-05-SS-35.0 35 644553.89 7671937.27 0 0 B-05-SS-39.0 39 644553.89 7671937.27 0 0 B-05-SS-45.0 45 644553.89 7671937.27 0 0 B-05-SS-50.2 50.2 644553.89 7671937.27 0 0.3 B-05-SS-55.0 55 644553.89 7671937.27 0 0 B-05-SS-60.0 60 644553.89 7671937.27 0 0 B-05-SS-65.0 65 644553.89 7671937.27 0 0 B-06-SS-10.0 10 644533.32 7671942.41 1 9.2 B-06-SS-12.0 12 644533.32 7671942.41 4 19.4 B-06-SS-14.0 14 644533.32 7671942.41 4 76.3 B-06-SS-18.0 18 644533.32 7671942.41 4 11.7 B-06-SS-22.0 22 644533.32 7671942.41 2 1.3

B-06 B-06-SS-25.0 B-06-SS-29.0

25 29

644533.32 644533.32

7671942.41 7671942.41

2 1

0.1 0.5

B-06-SS-35.0 35 644533.32 7671942.41 0 1.1 B-06-SS-41.5 41.5 644533.32 7671942.41 0 0 B-06-SS-45.0 45 644533.32 7671942.41 0 0 B-06-SS-55.0 55 644533.32 7671942.41 0 0 B-06-SS-65.0 65 644533.32 7671942.41 0 0 B-07-SS-6.0 6 644514.67 7671949.14 4 18 B-07-SS-11.0 11 644514.67 7671949.14 4 12.3 B-07-SS-15.0 15 644514.67 7671949.14 4 15.3 B-07-SS-20.0 20 644514.67 7671949.14 1 13.3 B-07-SS-25.0 25 644514.67 7671949.14 4 11.4 B-07-SS-30.0 30 644514.67 7671949.14 1 8.2 B-07-SS-35.0 35 644514.67 7671949.14 0 3

B-07 B-07-SS-41.0 B-07-SS-45.0

41 45

644514.67 644514.67

7671949.14 7671949.14

0 0

0 0

B-07-SS-50.0 50 644514.67 7671949.14 0 0 B-07-SS-55.0 55 644514.67 7671949.14 0 0 B-07-SS-57.0 57 644514.67 7671949.14 0 1.5 B-07-SS-59.0 59 644514.67 7671949.14 0 3 B-07-SS-61.0 61 644514.67 7671949.14 0 2.1 B-07-SS-63.0 63 644514.67 7671949.14 0 0



Test Boring


B-07-SS-65.0 65 644514.67 7671949.14 0 0 B-08-SS-8.0 8 644495.78 7671956.58 4 64.9 B-08-SS-10.0 10 644495.78 7671956.58 4 19.2 B-08-SS-12.0 12 644495.78 7671956.58 4 28.2

B-08 B-08-SS-14.0 B-08-SS-16.0

14 16

644495.78 644495.78

7671956.58 7671956.58

4 4

17.2 22.1

B-08-SS-18.0 18 644495.78 7671956.58 4 29.8 B-08-SS-24.0 24 644495.78 7671956.58 4 6.7 B-08-SS-26.0 26 644495.78 7671956.58 4 9.3 B-09-SS-6.0 6 644477.62 7671961.64 2 2.9 B-09-SS-8.0 8 644477.62 7671961.64 3 3.4 B-09-SS-9.0 9 644477.62 7671961.64 3 3.1

B-09 B-09-SS-14.0 14 644477.62 7671961.64 3 4.6 B-09-SS-18.0 18 644477.62 7671961.64 3 2.4 B-09-SS-22.0 22 644477.62 7671961.64 3 10.8 B-09-SS-27.0 27 644477.62 7671961.64 3 4.1 B-10-SS-6.0 6 644457.39 7671967.97 1 3.5 B-10-SS-8.0 8 644457.39 7671967.97 1 4.9 B-10-SS-10.0 10 644457.39 7671967.97 2 3.1

B-10 B-10-SS-16.0 16 644457.39 7671967.97 4 4.3 B-10-SS-20.0 20 644457.39 7671967.97 3 2.7 B-10-SS-24.0 24 644457.39 7671967.97 2 2.6 B-10-SS-27.0 27 644457.39 7671967.97 1 2.9 B-11-SS-4.0 4 644437.74 7671974.17 0 3.3 B-11-SS-6.0 6 644437.74 7671974.17 0 2.6

B-11 B-11-SS-14.0 B-11-SS-20.0

14 20

644437.74 644437.74

7671974.17 7671974.17

4 4

4.9 2.4

B-11-SS-24.0 24 644437.74 7671974.17 3 2.1 B-11-SS-27.0 27 644437.74 7671974.17 2 4.7 B-12-SS-6.0 6 644411.47 7671982.19 0 0 B-12-SS-13.0 13 644411.47 7671982.19 0 0 B-12-SS-16.0 16 644411.47 7671982.19 0 0 B-12-SS-20.0 20 644411.47 7671982.19 0 0 B-12-SS-25.0 25 644411.47 7671982.19 0 0

B-12 B-12-SS-27.0 B-12-SS-32.0

27 32

644411.47 644411.47

7671982.19 7671982.19

1 0

2 1.3

B-12-SS-35.0 35 644411.47 7671982.19 0 4 B-12-SS-45.0 45 644411.47 7671982.19 0 0 B-12-SS-55.0 55 644411.47 7671982.19 0 2.2 B-12-SS-60.0 60 644411.47 7671982.19 0 0 B-12-SS-65.0 65 644411.47 7671982.19 0 0 B-13-SS-8.0 8 644627.27 7672123.46 0 108 B-13-SS-10.0 10 644627.27 7672123.46 0 9.1 B-13-SS-12.0 12 644627.27 7672123.46 2 19.8 B-13-SS-14.0 14 644627.27 7672123.46 4 17.2 B-13-SS-15.0 15 644627.27 7672123.46 4 13.6 B-13-SS-20.0 20 644627.27 7672123.46 4 25.8

B-13 B-13-SS-25.0 25 644627.27 7672123.46 0 2.4



Test Boring


B-13-SS-29.0 29 644627.27 7672123.46 2 6.1 B-13-SS-35.0 35 644627.27 7672123.46 1 1.2 B-13-SS-41.0 41 644627.27 7672123.46 1 2.2 B-13-SS-45.0 45 644627.27 7672123.46 0 0.6 B-13-SS-55.0 55 644627.27 7672123.46 0 0 B-13-SS-65.0 65 644627.27 7672123.46 0 0 B-14-SS-8.0 8 644644.53 7672169.19 0 0.4 B-14-SS-10.0 10 644644.53 7672169.19 1 118 B-14-SS-12.0 12 644644.53 7672169.19 1 58.7 B-14-SS-13.0 13 644644.53 7672169.19 4 35.6

B-14 B-14-SS-18.5 B-14-SS-25.0

18.5 25

644644.53 644644.53

7672169.19 7672169.19

4 0

23.1 1.6

B-14-SS-35.0 35 644644.53 7672169.19 0 0 B-14-SS-45.0 45 644644.53 7672169.19 0 0 B-14-SS-55.0 55 644644.53 7672169.19 0 0 B-14-SS-64.0 64 644644.53 7672169.19 0 0 B-15-SS-10.0 10 644567.58 7672194.03 1 NA B-15-SS-20.0 20 644567.58 7672194.03 1 NA B-15-SS-27.0 27 644567.58 7672194.03 1 NA

B-15 B-15-SS-41.0 41 644567.58 7672194.03 0 NA B-15-SS-47.0 47 644567.58 7672194.03 0 NA B-15-SS-57.0 57 644567.58 7672194.03 0 NA B-15-SS-65.0 65 644567.58 7672194.03 0 NA B-16-SS-2.0 2 644476.82 7672173.19 0 NA B-16-SS-5.0 5 644476.82 7672173.19 0 NA B-16-SS-10.0 10 644476.82 7672173.19 2 NA B-16-SS-12.0 12 644476.82 7672173.19 3 NA

B-16 B-16-SS-15.0 15 644476.82 7672173.19 1 NA B-16-SS-20.0 20 644476.82 7672173.19 0 NA B-16-SS-25.0 25 644476.82 7672173.19 0 NA B-16-SS-30.0 30 644476.82 7672173.19 0 NA B-16-SS-35.0 35 644476.82 7672173.19 0 NA B-17-SS-11.0 11 644651.39 7672271.64 0 NA B-17-SS-16.0 16 644651.39 7672271.64 0 NA B-17-SS-25.0 25 644651.39 7672271.64 0 NA

B-17 B-17-SS-36.0 36 644651.39 7672271.64 0 NA B-17-SS-45.0 45 644651.39 7672271.64 0 NA B-17-SS-55.0 55 644651.39 7672271.64 0 NA B-17-SS-65.0 65 644651.39 7672271.64 0 NA B-18-SS-11.0 11 644736.30 7672131.87 0 NA B-18-SS-15.0 15 644736.30 7672131.87 0 NA B-18-SS-18.0 18 644736.30 7672131.87 0 NA B-18-SS-23.0 23 644736.30 7672131.87 0 NA B-18-SS-25.0 25 644736.30 7672131.87 2 NA

B-18 B-18-SS-27.0 B-18-SS-29.0

27 29

644736.30 644736.30

7672131.87 7672131.87

2 1

NA NA

B-18-SS-31.0 31 644736.30 7672131.87 0 NA B-18-SS-35.0 35 644736.30 7672131.87 0 NA



Test Boring


B-18-SS-45.0 45 644736.30 7672131.87 0 NA B-18-SS-55.0 55 644736.30 7672131.87 0 NA B-18-SS-65.0 65 644736.30 7672131.87 0 NA B-19-SS-2.5 2.5 644828.54 7672096.00 0 NA B-19-SS-12.0 12 644828.54 7672096.00 0 NA B-19-SS-15.0 15 644828.54 7672096.00 0 NA B-19-SS-20.0 20 644828.54 7672096.00 0 NA

B-19 B-19-SS-25.0 B-19-SS-27.0

25 27

644828.54 644828.54

7672096.00 7672096.00

0 0

NA NA

B-19-SS-35.0 35 644828.54 7672096.00 0 NA B-19-SS-45.0 45 644828.54 7672096.00 0 NA B-19-SS-55.0 55 644828.54 7672096.00 0 NA B-19-SS-65.0 65 644828.54 7672096.00 0 NA B-20-SS-5.0 5 644923.24 7672064.20 0 NA B-20-SS-15.0 15 644923.24 7672064.20 0 NA B-20-SS-20.0 20 644923.24 7672064.20 0 NA

B-20 B-20-SS-25.0 B-20-SS-35.0

25 35

644923.24 644923.24

7672064.20 7672064.20

0 0

NA NA

B-20-SS-45.0 45 644923.24 7672064.20 0 NA B-20-SS-55.0 55 644923.24 7672064.20 0 NA B-20-SS-65.0 65 644923.24 7672064.20 0 NA B-21-SS-11.0 11 644574.28 7672009.50 0 NA B-21-SS-15.0 15 644574.28 7672009.50 0 NA B-21-SS-21.0 21 644574.28 7672009.50 1 NA B-21-SS-25.0 25 644574.28 7672009.50 1 NA

B-21 B-21-SS-28.0 B-21-SS-30.0

28 30

644574.28 644574.28

7672009.50 7672009.50

2 1

NA NA

B-21-SS-33.0 33 644574.28 7672009.50 1 NA B-21-SS-39.0 39 644574.28 7672009.50 1 NA B-21-SS-45.0 45 644574.28 7672009.50 0 NA B-21-SS-55.0 55 644574.28 7672009.50 0 NA B-22-SS-15.0 15 644482.49 7672038.72 0 10.7 B-22-SS-18.0 18 644482.49 7672038.72 0 4.7 B-22-SS-25.0 25 644482.49 7672038.72 0 3.5

B-22 B-22-SS-35.0 35 644482.49 7672038.72 0 0.1 B-22-SS-45.0 45 644482.49 7672038.72 0 NA B-22-SS-55.0 55 644482.49 7672038.72 0 NA B-22-SS-63.0 63 644482.49 7672038.72 0 NA B-23-SS-11.0 11 644616.04 7671816.24 0 NA B-23-SS-15.0 15 644616.04 7671816.24 0 NA B-23-SS-18.5 18.5 644616.04 7671816.24 0 NA

B-23 B-23-SS-25.0 B-23-SS-34.0

25 34

644616.04 644616.04

7671816.24 7671816.24

0 0

NA NA

B-23-SS-45.0 45 644616.04 7671816.24 0 NA B-23-SS-55.0 55 644616.04 7671816.24 0 NA B-23-SS-65.0 65 644616.04 7671816.24 0 NA B-24-SS-15.0 15 644462.40 7671861.82 0 0.5 B-24-SS-20.0 20 644462.40 7671861.82 0 1.1



Test Boring


B-24-SS-25.0 25 644462.40 7671861.82 0 1.1 B-24-SS-31.0 31 644462.40 7671861.82 0 1

B-24 B-24-SS-35.0 35 644462.40 7671861.82 0 1.2 B-24-SS-45.0 45 644462.40 7671861.82 0 0.6 B-24-SS-55.0 55 644462.40 7671861.82 0 1 B-24-SS-60.0 60 644462.40 7671861.82 0 0.9 B-24-SS-65.0 65 644462.40 7671861.82 0 NA

B-25 B-25-SS-10.0 B-25-SS-17.0

10 17

645611.67 645611.67

7670930.08 7670930.08

0 0

NA NA

B-26-SS-9.5 9.5 644503.24 7671984.79 0 0.7 B-26-SS-12.0 12 644503.24 7671984.79 0 0.8

B-26 B-26-SS-15.0 B-26-SS-20.0

15 20

644503.24 644503.24

7671984.79 7671984.79

2 3

2.5 25.9

B-26-SS-24.0 24 644503.24 7671984.79 2 3.7 B-26-SS-27.0 27 644503.24 7671984.79 1 0.8 B-27-SS-15.0 15 644032.49 7672640.59 0 0.6 B-27-SS-25.0 25 644032.49 7672640.59 0 NA

B-27 B-27-SS-35.0 35 644032.49 7672640.59 0 NA B-27-SS-55.0 55 644032.49 7672640.59 0 NA B-27-SS-65.0 65 644032.49 7672640.59 0 NA B-28-SS-8.0 8 644666.48 7671976.89 0 0.6 B-28-SS-15.0 15 644666.48 7671976.89 0 3.9

B-28 B-28-SS-21.0 B-28-SS-25.0

21 25

644666.48 644666.48

7671976.89 7671976.89

0 0

4 8.2

B-28-SS-35.0 35 644666.48 7671976.89 0 1.3 B-28-SS-45.0 45 644666.48 7671976.89 0 2 B-29-SS-10.0 10 644486.97 7671926.76 1 5.3 B-29-SS-14.0 14 644486.97 7671926.76 3 11.3

B-29 B-29-SS-19.0 19 644486.97 7671926.76 4 12.2 B-29-SS-24.0 24 644486.97 7671926.76 2 10.2 B-29-SS-27.0 27 644486.97 7671926.76 2 17.7


Table 4-2 Summary of VOCs in Subsurface Soils Supplemental Investigaiton, Fall 2008 Units in micrograms per kilogram

Test Boring Sample Name Depth

Sample Rank

CVOCs

Naphthalene

BTEX

1,1,1-Trichloroethane


1,1-Dichloroethane

1,1-Dichloroethene

1,2-Dichloroethane

cis-1,2-Dichloroethene

trans-1,2-Di chloroethene PCE TCE VC Benzene Toluene

Ethylbenzene

m,p-Xylene

o-Xylene

Cleanup Goals - - - - - - - 7 13 0.1 - - - - - -

B-01 B-01-SS-15.0 12 0 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 1 UJ 10 UJ 10 UJ 10 UJ 1.6 UJ 10 UJ 10 UJ 10 UJ 20 UJ 10 UJ

B-02 B-02-SS-25.0 25 3 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 1 UJ 10 UJ 10 UJ 10 UJ 458 J 10 UJ 10 UJ 1.4 UJ 3.3 UJ 10 UJ

B-03 B-03-SS-65.0 63 0 10 U 10 U 10 U 10 U 10 U 10 U 1 UJ 10 U 10 U 10 U 2.7 UJ 10 U 10 U 10 U 20 U 10 U

B-05-SS-14.0 14 4 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 1 UJ 10 UJ 10 UJ 10 UJ 551 J 10 UJ 10 UJ 1.1 UJ 20 UJ 10 UJ


B-05-SS-45.0 45 0 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 1 UJ 10 UJ 10 UJ 10 UJ 1.6 UJ 10 UJ 10 UJ 10 UJ 20 UJ 10 UJ


B-06 B-06-SS-14.0 14 4 10 U 10 U 10 U 2.4 UJ 10 U 1620 10 U 7280 574 4 UJ 75700 10 83 2930 2990 2330

B-07 B-07-SS-15.0 15 4 10 U 10 U 10 U 10 U 10 U 8.2 UJ 1 U 49.3 3.3 UJ 10 U 81300 10 U 5.8 UJ 39.6 64.6 31.5

B-07-SS-25.0 25 4 10 U 10 U 10 U 10 U 10 U 10 U 1 U 81.7 10 U 10 U 89600 10 U 1.8 UJ 33.8 53.6 29.1

B-08 B-08-SS-14.0 14 4 10 U 10 U 10 U 10 U 10 U 23.9 1 U 53.6 43.2 10 U 30300 0.4 UJ 12.7 24.6 36.7 7.6 UJ

B-08-SS-24.0 24 4 10 U 10 U 10 U 2.2 UJ 10 U 494 5 U 402 505 7.6 UJ 66300 4.4 UJ 25 367 477 52.6

B-09 B-09-SS-18.0 18 3 10 U 10 U 10 U 10 U 10 U 5.2 UJ 1 U 5.2 UJ 4.9 UJ 0.91 UJ 4200 0.52 UJ 10 U 8.7 UJ 24.3 7.6 UJ

B-10 B-10-SS-20.0 20 3 10 U 10 U 10 U 10 U 10 U 8.7 UJ 1 U 10 U 10 U 10 U 5 UJ 10 U 10 U 10 U 20 U 10 U

B-11 B-11-SS-20.0 20 4 10 U 10 U 10 U 10 U 10 U 10 U 1 U 1.5 UJ 10 U 10 U 778 10 U 10 U 0.85 UJ 3.3 UJ 2.1 UJ

B-13-SS-15.0 15 4 10 U 10 U 10 U 10 U 10 U 40.2 1 U 554 20.8 0.78 UJ 27000 10 U 8.4 UJ 1.9 UJ 7.1 UJ 2 UJ



B-13-SS-8.0 8 0 10 U 10 U 10 U 10 U 10 U 14.7 5 U 1.3 UJ 10 U 6.3 UJ 665 10 U 10 U 10 U 20 U 10 U

B-14-SS-13.0 13 4 10 U 10 U 10 U 10 U 10 U 66.7 1 U 310 12.9 3.4 UJ 1280 10 U 4.1 UJ 3.8 UJ 9.3 UJ 3.9 UJ

B-14 B-14-SS-25.0 25 0 10 U 10 U 10 U 10 U 10 U 10.4 1 U 8.5 UJ 10 U 10 U 513 10 U 10 U 10 U 20 U 10 U

B-14-SS-45.0 45 0 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 10 UJ 1 UJ 10 UJ 10 UJ 10 UJ 104 J 10 UJ 10 UJ 10 UJ 20 UJ 10 UJ


B-17 B-17-SS-65.0 65 0 10 U 10 U 10 U 10 U 10 U 10 U 1 U 10 U 10 U 10 U 4.7 UJ 10 U 10 U 10 U 20 U 10 U

B-29 B-29-SS-19.0 19 4 10 U 0.98 UJ 10 U 10 U 10 U 40.8 2500 U 42.6 5.3 UJ 0.91 UJ 115000 0.94 UJ 3.7 UJ 28.9 57.4 29.8

EPA R-10 AES 1/7/2009 NW Pipe and Casing 1 SummVOCsSoilv2.xls

Table 4-3: Summary of PAHs in Subsurface Soil Supplemental Field Investigation, Fall 2008 Units in micrograms per kilogram

Test Boring

Sample Name

Depth Sample Rank

Acenaphthene

Acenaphthylene

Anthracene Benzo(a) anthracene

Benzo(a) pyrene

Benzo(b) fluoranthene

Benzo(g,h,i) perylene

Benzo(k) fluoranthene

Chrysene Dibenz(a,h) anthracene

Fluoranthene Fluorene Indeno (1,2,3cd) pyrene

Naphthalene Phenanthrene Pyrene

Cleanup Goals - - - 2,500 250 2,500 - 2,500 250,000 250 - - 2,500 - - -

B-02 B-02-SS-25.0 25 3 6820 J 32.7 J 1270 J 737 J 109 J 100 J 19.3 J 121 J 633 J 12 J 7770 J 4370 J 20.7 J 458 J 15800 J 6550 J

B-05 B-05-SS-14.0 14 4 25300 J 96 J 4750 J 3290 J 527 J 544 J 112 J 602 J 2840 J 75.3 J 27200 J 11500 J 115 J 551 J 58500 J 26400 J

B-06 B-06-SS-14.0 14 4 272000 6.67 U 31100 21000 4050 3640 865 3920 19200 443 200000 121000 937 75700 415000 170000

B-07 B-07-SS-15.0 15 4 432000 J 1730 J 66100 J 40100 J 6070 J 6200 J 1160 J 6730 J 35000 J 733 J 371000 J 251000 J 1290 J 81300 752000 J 300000 J

B-07-SS-25.0 25 4 123000 J 316 J 16200 J 8730 J 1280 J 1450 J 245 J 1530 J 7830 J 162 J 118000 J 57500 J 260 J 89600 236000 J 65300 J

B-08 B-08-SS-14.0 14 4 9530 J 50.7 J 4130 J 947 J 125 J 147 J 20.7 J 119 J 853 J 12.7 J 10900 J 5870 J 22 J 30300 27700 J 7000 J

B-08-SS-24.0 24 4 146000 J 374 J 21200 J 11600 J 1440 J 1610 J 253 J 1560 J 10300 J 173 J 141000 J 73000 J 293 J 66300 271000 J 88200 J

B-09 B-09-SS-18.0 18 3 51300 J 174 J 8170 J 4950 J 674 J 861 J 69.3 J 805 J 4250 J 52 J 52700 J 28700 J 82.7 J 4200 118000 J 40800 J

B-10 B-10-SS-20.0 20 3 10.7 6.67 U 6.7 UJ 3.3 UJ 0.67 UJ 6.67 U 2 UJ 1.3 UJ 3.3 UJ 2 UJ 39.3 7.33 2 UJ 5 UJ 46.7 23.3

B-11 B-11-SS-20.0 20 4 3590 17.3 594 423 48 68 7.33 62 361 5.3 UJ 3240 2180 8 778 8580 2890

B-13 B-13-SS-15.0 15 4 97700 158 10800 6130 1000 1110 159 1150 5690 96.7 81700 34500 166 27000 163000 60300

B-13-SS-8.0 8 0 5680 6.67 U 969 457 162 157 58 163 471 29.3 4260 2600 58.7 665 9430 3240

B-14 B-14-SS-13.0 13 4 14400 40.7 1630 997 147 155 26.7 165 864 20 9430 6190 32 1280 22500 7900

B-14-SS-25.0 25 0 764 2.7 UJ 109 44 9.33 8.67 4.7 UJ 8.67 42 2.7 UJ 461 292 3.3 UJ 513 1190 423

B-29 B-29-SS-19.0 19 4 152000 66.7 U 20100 12500 1830 2410 249 1970 10900 188 164000 76000 313 115000 317000 93000

EPA R-10 AES 1/7/2009 NW Pipe and Casing 1 SummPAHsSoilv2.xls

Table 5-1 Summary of VOCs in Groundwater Supplemental Field Investigation, Fall 2008 Units in micrograms per liter

Test Boring

Sample Name Depth Sample Rank

CVOCs

Naphthalene

BTEX



1,1-Dichloroethane

1,1-Dichloroethene

1,2-Dichloroethane


trans-1,2-Dichloroethene PCE TCE VC Benzene Toluene

Ethylbenzene

m,p-Xylene

o-Xylene

Remedial Goals - - - - - - - 1.0 1.6 1.0 - - - - - -

B-01-GW-27.0 27 2 1 U 0.93 UJ 1 U 1.53 1 U 574 NA 1100 165 13.4 1150 0.78 11 7.76 12 11.2

B-01 B-01-GW-47.0 47 0 1 U 1 U 1 U 1 U 1 U 315 NA 142 32 4.34 1280 0.41 2.52 8.68 23.7 22.4

B-01-GW-65.0 65 0 1 U 1 U 1 U 1 U 1 U 114 NA 125 19.2 6.08 470 0.22 UJ 1.91 4.38 10.5 9.95

B-02-GW-27.0 27 3 10 U 10 U 10 U 10 U 10 U 1100 NA 214 122 103 2870 3.1 14.7 115 111 83.2

B-02 B-02-GW-46.0 46 2 1 U 1 U 1 U 1 U 1 U 140 NA 119 53.1 5.67 2580 0.34 3.34 43.7 46.7 36.1

B-02-GW-65.0 65 0 1 U 1 U 1 U 1 U 1 U 49.4 NA 69.3 21.3 4.24 1760 0.8 1.92 18.5 22.3 17.3

B-03-GW-27.0 27 0 1 U 1 U 1 U 3.35 1 U 1220 NA 1880 769 16.4 320 1.54 0.39 UJ 2.13 2.12 1.06

B-03 B-03-GW-47.0 47 0 1 U 1 U 1 U 1 U 1 U 122 NA 105 74.5 5.33 590 0.32 3.92 2.31 2.07 1.1

B-03-GW-65.0 65 0 1 U 1 U 1 U 1 U 1 U 49.3 NA 13 16.9 1 U 50.1 0.3 U 0.74 UJ 0.46 UJ 0.26 UJ 1 U

B-04-GW-27.0 27 0 1 U 1 U 1 U 1 U 1 U 148 1 U 49.8 9.57 4.48 1 U 0.3 U 1 U 1 U 2 U 1 U

B-04 B-04-GW-47.0 47 1 1 U 1 U 1 U 1 U 1 U 960 20 U 64 87.1 12 1.05 0.3 U 1 U 1 U 2 U 1 U

B-04-GW-65.0 65 0 1 U 1 U 1 U 1 U 1 U 7.67 1 U 26.6 15 1 U 0.766 0.3 U 1 U 1 U 2 U 1 U

B-05-GW-27.0 27 3 1 U 1 U 1 U 1.91 1 U 714 3.24 272 168 63.3 1450 2.22 6.74 36.5 39.3 33.6

B-05 B-05-GW-47.0 47 2 1 U 1 U 1 U 1 U 1 U 91.7 1 U 231 83.8 3.18 1150 0.4 1.29 17 19.7 16.6

B-05-GW-65.0 65 2 1 U 1 U 1 U 1 U 1 U 29.4 1 U 83.2 28.5 0.95 UJ 728 0.2 UJ 0.95 UJ 10.6 10.5 9.4

B-06-GW-27.0 27 3 5 U 5 U 5 U 5 U 5 U 467 5 U 72.8 159 35 1380 2.1 3.1 UJ 22.2 24.2 15.6

B-06 B-06-GW-47.0 47 1 5 U 5 U 5 U 5 U 5 U 82.2 20 U 110 144 4.2 UJ 667 1.5 U 1 UJ 11.7 11.7 7.85

B-06-GW-65.0 65 0 1 U 1 U 1 U 1 U 1 U 18.9 1 U 22 23.8 0.61 UJ 451 0.16 UJ 0.4 UJ 3.83 4.65 3.16

B-07-GW-27.0 27 2 5 U 5 U 5 U 5 U 5 U 129 20 U 61.6 71.2 35.4 734 3.55 4.7 UJ 17.4 15.6 7.75

B-07 B-07-GW-47.0 47 2 5 U 5 U 5 U 5 U 5 U 56.3 5 U 81.6 107 2.7 UJ 1340 0.55 UJ 1.9 UJ 7.75 10 UJ 3.8 UJ

B-07-GW-65.0 65 2 5 U 5 U 5 U 5 U 5 U 6.8 20 U 28.7 17.6 5 U 1320 1.5 U 0.95 UJ 4.6 UJ 4.2 UJ 1.8 UJ

B-08 B-08-GW-27.0 27 4 1 U 1 U 1 U 1.25 1 U 296 1.93 147 230 16.6 2190 2.84 7.57 25.4 35.2 12.6

B-09 B-09-GW-27.0 27 3 5 U 5 U 5 U 5 U 5 U 92.1 20 U 62.9 76.8 8.15 1860 1.1 UJ 7.25 18.2 22.6 5.5

B-10 B-10-GW-27.0 27 2 5 U 5 U 5 U 5 U 5 U 98.2 5 U 6.25 33.5 9.2 263 1.5 U 5 U 2.2 UJ 3.6 UJ 1.2 UJ

B-11 B-11-GW-27.0 27 1 1 U 1 U 1 U 0.57 UJ 1 U 109 1 U 4.6 38.2 5.74 141 0.18 UJ 0.2 UJ 0.7 UJ 2.12 1.43

B-12-GW-27.0 27 0 1 U 1 U 1 U 1 U 1 U 34.2 1 U 13.6 39 1.43 157 0.12 UJ 0.14 UJ 0.64 UJ 2.14 1.01

B-12 B-12-GW-47.0 47 0 1 U 1 U 1 U 1 U 1 U 2.98 1 U 6.26 23.9 1 U 9.49 0.3 U 0.14 UJ 0.1 UJ 2 U 1 U

B-12-GW-65.0 65 0 1 U 1 U 1 U 1 U 1 U 0.54 UJ 1 U 1 U 3.77 1 U 0.49 UJ 0.3 U 0.23 UJ 0.21 UJ 2 U 1 U

EPA R-10 AES 1/7/2009 NW Pipe and Casing 1 SummVOCsGWv2.xls


Test Boring


CVOCs

Naphthalene

BTEX



1,1-Dichloroethane

1,1-Dichloroethene

1,2-Dichloroethane



Ethylbenzene

m,p-Xylene

o-Xylene

Remedial Goals - - - - - - - 1.0 1.6 1.0 - - - - - -

B-13

B-13-GW-27.0

B-13-GW-47.0

B-13-GW-65.0

27

47

65

4

0

0

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

2.35

1 U

1 U

1 U

1 U

1 U

873

21.1

1.24

2.77

1 U

1 U

550

127

14.3

157

12

1.23

54.2

1 U

1 U

14600

621

164

0.96

0.16 UJ

0.3 U

12

1.55

0.21 UJ

5.73

1.4

0.3 UJ

18.2

4.18

0.43 UJ

6.98

1.38 0.13 UJ

B-14

B-14-GW-27.0 B-14-GW-27.0-

FD

B-14-GW-47.0

27

27

47

4

2

25 U

25 U

25 U

25 U

25 U

25 U

25 U

25 U

25 U

25 U

25 U

25 U

25 U

25 U

25 U

76

80.5

46.8

25 U

25 U

25 U

620

645

2860

38.8

48

95.5

25 U

25 U

25 U

1610

1470

1570

7.5 U

7.5 U

7.5 U

3.8 UJ

2.8 UJ

4.5 UJ

7 UJ

7 UJ

14 UJ

5.8 UJ

5.2 UJ

20 UJ

2.5 UJ

25 U

7 UJ

B-15

B-14-GW-64.0

B-15-GW-27.0

B-15-GW-47.0

64

27

47

0

2

0

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

5.01

81.1

13.4

100 U

1 U

1 U

1140

135

12.2

22.4

70.8

8.12

1 U

2.55

1 U

762

374

127

0.3 U

0.3 U

0.3 U

1.1

0.29 UJ

0.86 UJ

7.21

0.32 UJ

0.25 UJ

15.8

0.74 UJ

0.16 UJ

5.82 0.23 UJ

1 U

B-15-GW-65.0 65 0 1 U 1 U 1 U 1 U 1 U 3.28 1 U 2.69 1.71 1 U 67.3 0.3 U 3.99 1 U 2 U 1 U

B-16 B-16-GW-27.0

B-16-GW-45.0

27

45

0

0

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

0.6 UJ

1 U

1 U

6.11

1 U

1 U

2.9

1 U

1 U

5.83

0.92 UJ

0.3 U

0.3 U

0.85 UJ

1 U

0.24 UJ

0.1 UJ

2 U

2 U

1 U

1 U

B-17 B-17-GW-27.0

B-17-GW-47.0

27

47

0

0

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

8.08

1 U

1 U

1 U

57.2

3.02

19.3

0.62 UJ

1.22

1 U

1 U

0.24 UJ

0.3 U

0.3 U

1 U

1.06

0.1 UJ

0.11 UJ

2 U

2 U

1 U

1 U

B-18

B-18-GW-27.0

B-18-GW-47.0

27

47

2

0

5 U

1 U

5 U

1 U

5 U

1 U

32.5

1 U

5 U

1 U

7650

130

5.8

0.99 UJ

6250

100

1220

14.3

129

1.59

67.3

21.8

3.95

0.58

1.2 UJ

1.21

0.7 UJ

0.13 UJ

10 U

2 U

5 U

1 U

B-18-GW-65.0 65 0 1 U 1 U 1 U 0.72 UJ 1 U 112 1.07 57.7 51.6 3.78 96.6 0.3 U 0.48 UJ 0.12 UJ 0.12 UJ 1 U

B-19

B-19-GW-27.0

B-19-GW-47.0

27

47

0

0

1 U

1 U

1 U

1 U

1 U

1 U

9.72

1.11

1 U

1 U

3280

231

5.29

1.05

1290

1140

988

174

6.23

10.2

0.66 UJ

0.49 UJ

0.74

0.32

1 U

0.79 UJ

0.12 UJ

0.1 UJ

2 U

2 U

1 U

1 U

B-19-GW-65.0 65 0 1 U 1 U 1 U 1 U 1 U 10.9 1 U 41.6 7.17 1 U 0.31 UJ 0.3 U 0.92 UJ 0.1 UJ 2 U 1 U

B-20-GW-27.0 27 0 1 U 1 U 1 U 0.64 UJ 1 U 230 1 U 35.8 45.9 2.33 0.3 UJ 0.3 U 1 U 1 U 2 U 1 U

B-20 B-20-GW-47.0

B-20-GW-65.0 B-20-GW-65.0-

FD

47

65

65

0

0

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1 U

1.15

1 U

1.18

1 U

1 U

1 U

448

463

164

1.47

1 U

1 U

523

424

165

227

69.2

86.9

21

4.72

6.52

1 U

1 U

0.23 UJ

0.3

0.3 U

0.3 U

1.84

0.85 UJ

0.97 UJ

0.1 UJ

1 U

1 U

2 U

2 U

2 U

1 U

1 U

1 U

B-21

B-21-GW-27.0

B-21-GW-47.0

27

47

2

0

1 U

1 U

4.93

1 U

1 U

1 U

8.83 J

1 U

0.82 UJ

1 U

136

6.08

50 U

1 U

7090

240

184

10.1

35.4

1 U

379

1140

1.18

0.3 U

1.7

2.22

12.2

24.7

11.9

30.2

4.55

15.8

B-22-GW-27.0 27 2 1 U 1 U 1 U 1 U 1 U 6.65 1 U 41.4 7.98 1 U 0.69 UJ 0.3 U 1 U 1 U 2 U 1 U

EPA R-10 AES NW Pipe and Casing 2

1/7/2009 SummVOCsGWv2.xls


Test Boring


CVOCs

Naphthalene

BTEX



1,1-Dichloroethane

1,1-Dichloroethene

1,2-Dichloroethane



Ethylbenzene

m,p-Xylene

o-Xylene

Remedial Goals - - - - - - - 1.0 1.6 1.0 - - - - - -

B-22 B-22-GW-47.0 47 0 1 U 1 U 1 U 1 U 1 U 6.65 1 U 8.91 13.1 1 U 46.9 0.3 U 0.62 UJ 0.71 UJ 0.63 UJ 1 U 0.81

B-22-GW-64.0 64 0 1 U 1 U 1 U 1 U 1 U 1 U 1 U 12 2.23 1 U 820 0.3 U 0.71 UJ 2.69 5.81 UJ

B-23-GW-27.0 27 0 1 U 1 U 1 U 1 U 1 U 158 1 U 483 121 1.68 8.04 0.3 U 1 U 1 U 2 U 1 U

B-23 B-23-GW-47.0 47 0 1 U 1 U 1 U 1 U 1 U 5.38 1 U 36.4 6.07 1 U 1.59 0.3 U 0.42 UJ 1 U 2 U 1 U

B-23-GW-65.0 65 0 1 U 1 U 1 U 1 U 1 U 1 U 1 U 6.54 1.74 1 U 1.03 0.3 U 0.66 UJ 1 U 2 U 1 U

B-24-GW-27.0 27 0 1 U 1 U 1 U 1.27 1 U 192 1.04 12.8 69.4 20.7 0.21 UJ 0.17 UJ 1 U 0.11 UJ 2 U 1 U

B-24 B-24-GW-47.0 47 0 1 U 1 U 1 U 1 U 1 U 41.4 1 U 45 80.9 2.71 0.41 UJ 0.3 U 0.37 UJ 0.14 UJ 2 U 1 U

B-24-GW-65.0 65 0 1 U 1 U 1 U 1 U 1 U 2.01 1 U 1.04 3.29 1 U 0.5 UJ 0.3 U 0.38 UJ 0.19 UJ 0.22 UJ 1 U

B-26 B-26-GW-27.0 27 1 1 U 1 U 1 U 1.51 1 U 1050 2.49 149 318 30.8 1120 0.93 1.96 4.69 3.52 1.12

B-27-GW-27.0 27 0 1 U 1 U 1 U 1 U 1 U 1.78 1 U 0.35 UJ 1.46 1 U 0.79 UB, UJ 0.3 U 0.16 UJ 1 U 2 U 1 U

B-27 B-27-GW-47.0 47 0 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0.56 UJ 1 U 0.9 UB, UJ 0.3 U 0.52 UJ 0.12 UJ 2 U 1 U

B-27-GW-65.0 65 0 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0.75 UB, UJ 0.3 U 0.27 UJ 0.12 UJ 2 U 1 U

B-28 B-28-GW-27.0 27 0 1 U 2.85 1 U 1.11 0.3 UJ 123 0.54 UJ 3830 342 7.91 0.22 UJ 0.26 UJ 1 U 0.23 UJ 2 U 1 U

B-28-GW-47.0 47 0 1 U 1 U 1 U 1 U 1 U 13.1 1 U 378 96.9 1.37 0.73 UJ 0.3 U 1 U 0.32 UJ 0.12 UJ 1 U

B-29-GW-27.0 27 3 1 U 1 U 1 U 1 U 1 U 13.6 1 U 17 13.2 3.28 1730 0.9 2.53 23.1 50.1 12.3 B-29 B-29-GW-27.0-

FD 27 1 U 1 U 1 U 1 U 1 U 15.2 1 U 15.4 14.7 4.06 1820 0.88 3.23 25.4 48.4 10.3

EPA R-10 AES 1/7/2009 NW Pipe and Casing 3 SummVOCsGWv2.xls

Table 5-2 Summary of PAHs in Groundwater Supplemental Field Investigation, Fall 2008 Units in micrograms per liter

Test Boring Sample Name Depth Matrix

Sample Rank

Acenaphthene

Acenaphthylene Anthracene

Benz(a) anthracene

Benzo(a) pyrene

Benzo(b) fluoranthene

Benzo(g,h,i) perylene

Benzo(k) fluoranthene Chrysene

Dibenz(a,h) anthracene Fluoranthene Fluorene

Indeno (1,2,3-cd)

pyrene Naphthalene Phenanthrene Pyrene

Remedial Goals -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -

B-01 B-01-GW-65.0 65 GW 0 710 4.39 34.7 10.3 1.39 1.85 0.284 1.97 8.86 0.142 136 229 0.284 470 460 81.8

B-04 B-04-GW-65.0 65 GW 0 2.55 0.0491 U 0.58 0.285 0.0098 UJ 0.0491 0.0491 U 0.0491 0.344 0.0491 U 6.71 1.87 0.0491 U 0.766 11.1 4.08

B-05 B-05-GW-65.0 65 GW 2 1040 27.7 63.6 24.8 4.21 4.25 0.716 4.73 21.5 0.442 351 345 0.747 728 806 225

B-07 B-07-GW-65.0 65 GW 2 4880 0.048 U 554 385 51.2 55 7.14 52.9 335 4.55 4250 3090 8.5 1320 8050 3390

B-12 B-12-GW-65.0 65 GW 0 17.1 0.035 UJ 21.9 9.67 1.26 1.18 0.283 1.3 8.94 0.177 164 38.4 0.318 0.49 UJ 239 97.2

B-13 B-13-GW-27.0 27 GW 4 96300 2.58 U 10000 6470 1120 1150 232 1010 5840 152 73100 38500 249 14600 137000 51000

EPA R-10 AES 1/7/2009 NW Pipe and Casing 1 SummPAHsGWv2.xls

Table 4-3 Water Quality Field Measurements Supplemental Field Investigation, Fall 2008

Test Boring

Sample Name Depth Rank pH (SU)

ORP (mV)

DO (mg/L)

Temp (C)

Cond (uS/cm)

Turb (NTU)

B-01-GW-27.0 27 2 7.03 -217.4 0.93 21.4 680 729.5 B-01 B-01-GW-47.0 47 0 7.44 -421.4 0.31 28.83 487 NA

B-01-GW-65.0 65 0 7.9 -495.1 0.34 19.56 403 NA B-02-GW-27.0 27 3 6.97 -331.4 0.34 21.97 1095 1216.7

B-02 B-02-GW-46.0 46 2 7.76 -252 0.29 17.06 476 NA B-02-GW-65.0 65 0 7.75 -102.1 0.7 22.55 367 NA B-03-GW-27.0 27 0 6.88 -137.2 0.38 21.58 74 1213.5

B-03 B-03-GW-47.0 47 0 7.81 -374.1 0.27 16.27 431 NA B-03-GW-65.0 65 0 7.87 -383.2 2.16 18.49 351 NA B-04-GW-27.0 27 0 6.64 -194.5 0.79 16.8 550 1172.1

B-04 B-04-GW-47.0 47 1 7.34 -478.6 0.39 19.27 718 B-04-GW-65.0 65 0 8 -469.4 0.37 22.41 229 1221.9 B-05-GW-27.0 27 3 7.1 -263 0.4 13.77 954 NA

B-05 B-05-GW-47.0 47 2 7.58 -313.2 0.55 20.27 422 NA B-05-GW-65.0 65 2 7.8 -476.4 0.34 20.81 288 NA B-06-GW-27.0 27 3 7.21 66.3 1 15.4 1046 NA

B-06 B-06-GW-47.0 47 1 7.47 -434.4 0.71 21.25 437 NA B-06-GW-65.0 65 0 7.81 -436.1 0.42 22.36 271 NA B-07-GW-27.0 27 2 6.97 -1.3 1.15 18.42 1398 1186.3

B-07 B-07-GW-47.0 47 2 7.55 -216.7 0.98 21.2 378 NA B-07-GW-65.0 65 2 7.93 -280.9 0.51 20.67 243 NA

B-08 B-08-GW-27.0 27 4 7.05 -222.1 0.36 14.7 970 NA B-09 B-09-GW-27.0 27 3 6.9 -59.8 1.11 18.37 627 1131.8 B-10 B-10-GW-27.0 27 2 7.13 -68.3 NA 17.5 512 1178.6 B-11 B-11-GW-27.0 27 1 7.39 -141.9 NA 14.65 464 1153.5

B-12-GW-27.0 27 0 7.26 -17.5 NA 17.8 354 1180.7 B-12 B-12-GW-47.0 47 0 7.9 -402.8 NA 24.48 208 NA

B-12-GW-65.0 65 0 8.01 -459.8 NA 31.3 219 NA B-13-GW-27.0 27 4 NA NA NA NA NA NA

B-13 B-13-GW-47.0 47 0 7.82 -579.3 0.12 25.16 213 NA B-13-GW-65.0 65 0 6.23 -479.3 0.09 22.28 193 NA B-14-GW-27.0 27 4 NA NA NA NA NA NA

B-14 B-14-GW-47.0 47 2 NA NA NA NA NA NA B-14-GW-64.0 64 0 7.83 -620.6 0.08 25.66 197 NA B-15-GW-27.0 27 2 7.34 -183.2 0.52 17.46 209 NA

B-15 B-15-GW-47.0 47 0 7.9 -618.1 0.05 22.1 213 NA B-15-GW-65.0 65 0 7.88 -632.8 0.3 22.97 213 NA

B-16 B-16-GW-27.0 B-16-GW-45.0

27 45

0 0

7.41 7.53

-483 -537

2.1 1.2

17.31 16.8

161 170

NA NA

B-17 B-17-GW-27.0 B-17-GW-47.0

27 47

0 0

7.59 7.85

-371.5 -530.2

0.3 0.12

20.28 21.21

179 179

NA NA

B-18-GW-27.0 27 2 7.48 -367.4 0.17 16.81 371 NA B-18 B-18-GW-47.0 47 0 7.67 -475.9 0.11 17.65 197 NA

B-18-GW-65.0 65 0 8.01 -564.2 1.35 21.79 214 NA B-19-GW-27.0 27 0 7.09 -429.1 0.22 17.58 719 NA

B-19 B-19-GW-47.0 47 0 7.99 -501.2 0.16 18.15 206 NA B-19-GW-65.0 65 0 7.98 -578.3 0.07 18.19 185 NA

EPA R-10 AES Contract 1/7/2009 NW Pipe and Casing 1 WrQualFndDepDisGWSamples.xls

Table 4-3 Water Quality Field Measurements Supplemental Field Investigation, Fall 2008

Test Boring

Sample Name Depth Rank pH (SU)

ORP (mV)

DO (mg/L)

Temp (C)

Cond (uS/cm)

Turb (NTU)

B-20-GW-27.0 27 0 NA NA NA NA NA NA B-20 B-20-GW-47.0 47 0 7.88 -579.9 0.06 18.47 270 NA

B-20-GW-65.0 65 0 7.78 -619.1 0.04 21.02 268 NA

B-21 B-21-GW-27.0 B-21-GW-47.0

27 47

2 0

7.19 7.55

-158.8 -554.2

0.64 0.05

18.74 17.99

452 189

NA NA

B-22-GW-27.0 27 2 7.34 13.2 5.05 19.93 246 NA B-22 B-22-GW-47.0 47 0 7.82 -563.8 0.07 17.04 232 NA

B-22-GW-64.0 64 0 7.78 -466.4 0.09 19.3 188 NA B-23-GW-27.0 27 0 7.55 -603.1 0.02 24.12 394 NA

B-23 B-23-GW-47.0 47 0 7.95 -612.5 0.04 17.95 210 NA B-23-GW-65.0 65 0 8.03 -558.2 0.05 20.64 206 NA B-24-GW-27.0 27 0 7.53 -403.3 0.15 20.75 270 NA

B-24 B-24-GW-47.0 47 0 7.83 -601.9 0.08 18.74 182 NA B-24-GW-65.0 65 0 7.93 -423 0.15 18.85 188 NA

B-26 B-26-GW-27.0 27 1 NA NA NA NA NA NA B-27-GW-27.0 27 0 6.67 -415.8 0.06 19.8 175 NA

B-27 B-27-GW-47.0 47 0 6.68 -516.8 0.03 22.27 199 NA B-27-GW-65.0 65 0 6.39 -528.4 0.02 21.52 195 NA

B-28 B-28-GW-27.0 B-28-GW-47.0

27 47

0 0

6.79 6.81

60.1 -408.7

0.09 0.04

18.15 21.06

291 231

NA NA

B-29 B-29-GW-27.0 27 3 NA NA NA NA NA NA

EPA R-10 AES Contract 1/7/2009 NW Pipe and Casing 2 WrQualFndDepDisGWSamples.xls

M E M O R A N D U M�

Date: December 12, 2008 To: Eric Roth From: Lori Bernardini

Cindy Blegen Subject: Analytical Data Quality Assurance Review – Northwest Pipe and Casing Supplemental

Site Investigation cc: Project File

Project Number: 415-232-8007 (020/F203) Project Name: Northwest Pipe and Casing Long Term Response Action Technical Assistance

and Oversight

IN T R O D U C T IO N

This memorandum summarizes the findings of an internal quality assurance/quality control (QA/QC) review of groundwater and soil analytical results for the Northwest Pipe and Casing Superfund Site (Site), Clackamas, Oregon. Site investigation and sampling activities were conducted between September and October 2008.

Laboratory services were provided by Specialty Analytical, Inc., Clackamas, Oregon for: sixty-eight groundwater samples; twenty-five soil samples; three groundwater field duplicates, and twenty-eight trip blanks. Sample analyses included: volatile organic compounds (VOCs) by U.S. EPA Method 8260C; semi-volatile organics (SVOCs) by U.S. EPA Method 8270 SIM; and permanent gasses by ASTM D1945. Final laboratory data were delivered to Parametrix via Tier II data reports following a three-step technical review by Specialty Analytical’s Project Chemist. The chemist reviewed all data and analytical QC elements against project, laboratory, and method QC criteria, and applied laboratory qualifiers where judged appropriate.

The Parametrix QA/QC review was conducted in accordance with the project Quality Assurance Project Plan (QAPP) (Parametrix, 2008), using the USEPA Contract Laboratory Program, (CLP) National Functional Guidelines for Organic Data Review (USEPA 1999) for guidance, as required. This data review was conducted on summary results only (i.e., did not include recalculation of results from raw data) and included evaluation of the following information for completeness, precision, and accuracy:

• Chain of custody documentation

• Analytical methods and holding times

• Laboratory quality control samples and applied qualifiers – including method blanks, laboratory control samples (LCS/LCSD), matrix spikes (MS/MSD), laboratory duplicate samples, and surrogates

• Field quality control samples – including trip blanks and field duplicates

(Rev. 02/04)

Eric Roth December 12, 2008 Page 2 of 25

• Other issues that may influence reported sample results

Table 1 lists the sample delivery packages collected, matrix, and the analyses performed.

Table 1. Groundwater and Soil Samples Collected and Analyses Performed

Lab Sample ID VOCs PAHs Permanent Gases Matrix

0809056 x x GW

0809057 x SO

0809068 x x SO

0809069 x GW

0809077 x GW

0809078 x SO

0809086 x GW

0809092 x GW

0809096 x GW

0809097 x GW

x x SO

0809106 x x GW

0809107 x x SO

0809110 x GW

0809111 x GW

x x SO

0809115 x GW

0809116 x x SO

0809117 x x SO

0809118 x x SO

0809119 x GW

0809125 x GW

0809126 x x SO

0809129 x GW

0809133 x x GW

0809138 x GW

0809139 x x GW

x x SO

0810008 x GW

0810009 x GW

x x SO

0810019 x GW

0810020 x GW

0810035 x GW

0810036 x GW

0810045 x GW

0810049 x GW


Lab Sample ID VOCs PAHs Permanent Gases Matrix

0810059 x SO

0810064 x GW

0810069 x GW

0810083 x GW

0810092 x GW

0810093 x GW

0810099 x GW

0810100 x GW

0810108 x GW

0810114 x GW

0810122 x GW

0810135 x GW

0810174 x GW

0810179 x GW

0810187 x GW

0810191 x GW

x x SO

0810192 x GW

D A TA Q U A LITY S U M M A R Y

In general, the data results reported met the laboratory and Parametrix quality control specifications and are acceptable as qualified for all qualitative and quantitative purposes. No data were rejected based on this review.

Identified issues are primarily associated with holding time exceedances. Per the project manager, some field samples were held at the laboratory until further notice. If and when a held sample was analyzed, the analysis generally took place outside of recommended holding times. This led to results being qualified (flagged) as estimated concentrations. Other issues which led to results being qualified included a trip blank detection and laboratory quality control sample recovery outside of acceptance limits.

Minor issues included matrix spike/matrix spike duplicates (MS/MSD) recoveries and relative percent differences (RPDs) outside of acceptance limits. These issues are generally associated with relatively high or low sample concentrations and/or with sample matrix interference. High analyte concentrations in QC samples make it difficult to calculate MS recoveries and/or RPDs. Low analyte concentrations create conditions where RPDs are not applicable. Sample matrix interference creates conditions where MS percent recoveries exceed established control limits. In most cases, review of laboratory QC data indicated that associated QC criteria were met and therefore the data were not qualified.

The laboratory was requested to report results detected above the Method Detection Limit (MDL) and to list both the MDL and the Method Reporting Limit (MRL) on the lab reports. All results below the MRL are considered undetected and were qualified with a “U”. In addition, results between the MDL and the Method Reporting Limit (MRL) are also considered estimates and were qualified with a “J”.

Table 2 summarizes the data qualifiers used in this review. Table 6, located at the end of this memorandum, summarizes all qualified groundwater and soil data.


Table 2. Definitions of Data Qualifiers

Qualifier Definition

U Analyte was not detected above the Method Reporting Limit (MRL).

UB Analyte was detected in a QC blank. The sample result is less than five times the blank concentration and is possibly due to cross-contamination. The analyte is considered not detected.

J The reported result should be considered an estimate.

C H A IN O F C U S TO D Y D O C U M E N TA TIO N

A copy of the chain of custody (COC) documentation was included in each laboratory data report. The COC form was filled out satisfactorily for all samples with the following exceptions or modifications noted during the data review.

• The PAH analysis requested for field sample B-04-GW-65.0 (0809086) was moved to a separate sample delivery group (0809092) in order to process more quickly.

• Trip blank TB-092508 (0809125) was given a name in the field that had already been used for a previous trip blank sample; therefore, this trip blank name was changed to TB-092508B for reporting purposes.

• Sample B-21-SS-35.0 (0810108) was incorrectly labeled on the container as B-21-SS-33.0. The chain of custody listed the correct sample name.

• Trip blank TB-101408 (0810108) was incorrectly listed on the lab report as Trip Blank. The lab reissued the lab report with the corrected field sample ID.

H O LD IN G TIM E S

All samples met the holding time criteria except for a group of soil samples that were selected for analysis following the end of the holding time period (see Table 3). All results for these samples were qualified as estimates (UJ for undetected and J for detected results).

Table 3. Samples that Exceeded Holding Times

Lab Sample ID Field Sample ID Date Sampled Matrix Analysis Method

0809057-01A B-01-SS-15.0 9/15/08 SO SW8260B

0809068-02A B-02-SS-25.0 9/16/08 SO 8270SIM

0809068-02B B-02-SS-25.0 9/16/08 SO SW8260B

0809097-01A B-05-SS-14.0 9/19/08 SO 8270SIM

0809097-01B B-05-SS-14.0 9/19/08 SO SW8260B

0809097-02A B-05-SS-25.0 9/19/08 SO SW8260B

0809097-04A B-05-SS-45.0 9/22/08 SO SW8260B

0809097-06A B-05-SS-65.0 9/22/08 SO SW8260B

0809111-02A B-07-SS-15.0 9/24/08 SO 8270SIM

0809111-03A B-07-SS-25.0 9/24/08 SO 8270SIM

0809116-02A B-08-SS-14.0 9/24/08 SO 8270SIM

0809116-03A B-08-SS-24.0 9/24/08 SO 8270SIM


Lab Sample ID Field Sample ID Date Sampled Matrix Analysis Method

0809118-01A B-09-SS-18.0 9/25/08 SO 8270SIM

0809139-03A B-13-SS-25.0 9/29/08 SO SW8260B

0809139-05A B-13-SS-45.0 9/30/08 SO SW8260B

0810009-06A B-14-SS-45.0 10/1/08 SO SW8260B

0810009-08A B-14-SS-64.0 10/1/08 SO SW8260B

TR IP B LA N K S

Naphthalene was detected in a trip blank above the method reporting limit concentration of 1.00 ug/L. Analyte concentrations in the associated samples with results less than five times the concentration found in the trip blank were qualified as undetected (UB), possibly due to cross-contamination (see Table 4).

Table 4. Samples Qualified Due to Trip Blank Results

Sample Analysis Data Lab Sample ID Field Sample ID Date Matrix Method Analyte Result Qualifier

0810179-02A B-27-GW-27.0 10/27/08 GW SW8260B Naphthalene 0.79 UB



M E TH O D B LA N K S

No analytes were detected in any method blanks with the exception of naphthalene in the method blank for lab report 0809106. However, all associated field sample results for naphthalene were either undetected or were greater than five times the concentration in the method blank. No results were qualified.

LC S /LC S D R E C O V E R IE S

All laboratory control spike (LCS) and laboratory spike duplicate (LCSD) percent recoveries and RPDs are within limits with the exception of chlorobenzene and 1,1-dichloroethene (DCE) for lab report 0810100. For chlorobenzene, the percent recovery was within continuing calibration verification (CCV) criteria, so no data were qualified. For DCE, the field results may be biased high due to the percent recovery; therefore, all detected results have been qualified as estimates (J). This applies to sample B21-GW-27.0 (0810100).

LA B O R A TO R Y D U PLIC A TE S A M PLE S

The laboratory prepared one laboratory duplicate for the groundwater sample analyzed for permanent gases (Method D1945Mod.). The primary and duplicate sample concentrations were screened against a relative percentage difference of 30% and all results were below this value. No results were qualified.

M S /M S D R E C O V E R IE S

Several MS/MSD recoveries and/or RPDs were outside of acceptance limits due to high or low sample concentrations or due to sample matrix interference. Review of laboratory QC data indicated that associated QC criteria were met and therefore the data were not qualified.


S U R R O G A TE R E C O V E R IE S

The recovery of VOC surrogate dibromofluoromethane for soil sample B-10-SS-20 (0809117-02A) is outside of limits. However, the other three associated surrogates are within limits. No results were qualified.

The recovery of PAH surrogate 2-fluorobiphenyl for soil samples B-11-SS-20.0, B-13-SS-8.0, and B-29SS-19.0 (0810191) are outside of limits. However, the other two associated surrogates are within limits. No results were qualified.

FIE LD S A M PLE D U PLIC A TE S

Three field duplicate groundwater samples were collected during this sampling event. Field duplicate precision for target analytes was screened against a RPD of 35%. Field duplicate RPDs were below this value with the exception of o-xylene, DCE, cis-1,2-dichloroethene (cis 1,2-DCE), and tetrachloroethene (PCE) (Table 5). No results were flagged based on duplicate RPDs alone.

Table 5. Field Sample Duplicate Results

Primary Duplicate Relative Field Duplicate Sample Result Sample Result Percent Precision Less

Analyte (ug/L) (ug/L) Difference (%) Than 35%? (Y/N)

The field duplicate FD-100108 (0810009) is a duplicate of B-14-GW-27.0 (0810008).

cis-1,2-Dichloroethene 76 80.5 5.75 Y

Ethylbenzene 7.0 J 7.0 J 0.00 Y

m,p-Xylene 5.8 J 5.2 J 10.91 Y

Naphthalene 1610 1470 9.09 Y

o-Xylene 2.5 J <1* 85.71 N

Tetrachloroethene 620 645 3.95 Y

Toluene 3.8 J 2.8 J 30.30 Y

Trichloroethene 38.8 48 21.20 Y


1,1-Dichloroethene <0.11* 1.18 165.89 N

cis-1,2-Dichloroethene 463 164 95.37 N

Naphthalene <0.21* 0.23 J 9.09 Y

Tetrachloroethene 424 165 87.95 N

Toluene 0.85 J 0.97 J 13.19 Y

Trichloroethene 69.2 86.9 22.68 Y

Vinyl chloride 4.72 6.52 32.03 Y


Benzene 0.9 0.88 2.25 Y

cis-1,2-Dichloroethene 13.6 15.2 11.11 Y

Ethylbenzene 23.1 25.4 9.48 Y

m,p-Xylene 50.1 48.4 3.45 Y

Naphthalene 1730 1820 5.07 Y


Analyte

Primary Sample Result

(ug/L)

Duplicate Sample Result

(ug/L)

Relative Percent

Difference (%)

Field Duplicate Precision Less

Than 35%? (Y/N)

o-Xylene 12.3 10.3 17.70 Y

Tetrachloroethene 17 15.4 9.88 Y

Toluene 2.53 3.23 24.31 Y

Trichloroethene 13.2 14.7 10.75 Y

Vinyl chloride 3.28 4.06 21.25 Y

* Sample was not detected so MDL value is listed. J - The result for this analyte is between the MDL and the MRL and should be considered an estimated concentration.

Q U A LIFIE D S O IL A N D G R O U N D W A TE R D A TA

Table 6 provides a summary of all analytical data results that were qualified following the data review of the Northwest Pipe and Casing Supplemental Site Investigation.


Table 6. Qualified Groundwater and Soil Data

Analysis Lab Sample ID Sample ID Method Analyte Result Units Qualifier Sample Date Matrix Reason

0809056-02A B-01-GW-27.0 SW8260B 1,1,2-Trichloroethane 0.93 ug/L UJ 15-Sep-08 GW Result between MDL and MRL

0809056-04A B-01-GW-65.0 SW8260B Benzene 0.22 ug/L UJ 16-Sep-08 GW Result between MDL and MRL

0809057-01A B-01-SS-15.0 SW8260B Naphthalene 1.6 ug/kg UJ 15-Sep-08 SO Result between MDL and MRL, holding time exceedance

0809057-01A B-01-SS-15.0 SW8260B Vinyl Chloride 10 ug/kg UJ 15-Sep-08 SO Holding time exceedance

0809057-01A B-01-SS-15.0 SW8260B Trichloroethene 10 ug/kg UJ 15-Sep-08 SO Holding time exceedance

0809057-01A B-01-SS-15.0 SW8260B Toluene 10 ug/kg UJ 15-Sep-08 SO Holding time exceedance

0809057-01A B-01-SS-15.0 SW8260B o-Xylene 10 ug/kg UJ 15-Sep-08 SO Holding time exceedance

0809057-01A B-01-SS-15.0 SW8260B m,p-Xylene 20 ug/kg UJ 15-Sep-08 SO Holding time exceedance

0809057-01A B-01-SS-15.0 SW8260B Ethylbenzene 10 ug/kg UJ 15-Sep-08 SO Holding time exceedance

0809057-01A B-01-SS-15.0 SW8260B cis-1,2-Dichloroethene 10 ug/kg UJ 15-Sep-08 SO Holding time exceedance

0809057-01A B-01-SS-15.0 SW8260B Benzene 10 ug/kg UJ 15-Sep-08 SO Holding time exceedance

0809057-01A B-01-SS-15.0 SW8260B 1,2-Dichloroethane 10 ug/kg UJ 15-Sep-08 SO Holding time exceedance

0809057-01A B-01-SS-15.0 SW8260B 1,1-Dichloroethene 10 ug/kg UJ 15-Sep-08 SO Holding time exceedance


0809057-01A B-01-SS-15.0 SW8260B 1,1,2-Trichloroethane 10 ug/kg UJ 15-Sep-08 SO Holding time exceedance


0809057-01A B-01-SS-15.0 SW8260B Tetrachloroethene 10 ug/kg UJ 15-Sep-08 SO Holding time exceedance

0809068-02A B-02-SS-25.0 8270SIM Fluoranthene 7770 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02A B-02-SS-25.0 8270SIM Chrysene 633 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02A B-02-SS-25.0 8270SIM Pyrene 6550 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02A B-02-SS-25.0 8270SIM Phenanthrene 15800 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02A B-02-SS-25.0 8270SIM Naphthalene 479 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02A B-02-SS-25.0 8270SIM Fluorene 4370 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02A B-02-SS-25.0 8270SIM Dibenz(a,h)anthracene 12 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02A B-02-SS-25.0 8270SIM Anthracene 1270 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02A B-02-SS-25.0 8270SIM Indeno(1,2,3-cd)pyrene 20.7 ug/kg J 16-Sep-08 SO Holding time exceedance



0809068-02A B-02-SS-25.0 8270SIM Benzo(k)fluoranthene 121 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02A B-02-SS-25.0 8270SIM Acenaphthylene 32.7 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02A B-02-SS-25.0 8270SIM Benz(a)anthracene 737 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02A B-02-SS-25.0 8270SIM Benzo(a)pyrene 109 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02A B-02-SS-25.0 8270SIM Acenaphthene 6820 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02A B-02-SS-25.0 8270SIM Benzo(b)fluoranthene 100 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02A B-02-SS-25.0 8270SIM Benzo(g,h,i)perylene 19.3 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02B B-02-SS-25.0 SW8260B Vinyl Chloride 10 ug/kg UJ 16-Sep-08 SO Holding time exceedance

0809068-02B B-02-SS-25.0 SW8260B cis-1,2-Dichloroethene 10 ug/kg UJ 16-Sep-08 SO Holding time exceedance

0809068-02B B-02-SS-25.0 SW8260B Toluene 10 ug/kg UJ 16-Sep-08 SO Holding time exceedance

0809068-02B B-02-SS-25.0 SW8260B Tetrachloroethene 10 ug/kg UJ 16-Sep-08 SO Holding time exceedance

0809068-02B B-02-SS-25.0 SW8260B o-Xylene 10 ug/kg UJ 16-Sep-08 SO Holding time exceedance

0809068-02B B-02-SS-25.0 SW8260B Naphthalene 458 ug/kg J 16-Sep-08 SO Holding time exceedance

0809068-02B B-02-SS-25.0 SW8260B Trichloroethene 10 ug/kg UJ 16-Sep-08 SO Holding time exceedance

0809068-02B B-02-SS-25.0 SW8260B Benzene 10 ug/kg UJ 16-Sep-08 SO Holding time exceedance

0809068-02B B-02-SS-25.0 SW8260B 1,2-Dichloroethane 10 ug/kg UJ 16-Sep-08 SO Holding time exceedance

0809068-02B B-02-SS-25.0 SW8260B 1,1-Dichloroethene 10 ug/kg UJ 16-Sep-08 SO Holding time exceedance


0809068-02B B-02-SS-25.0 SW8260B 1,1,2-Trichloroethane 10 ug/kg UJ 16-Sep-08 SO Holding time exceedance


0809068-02B B-02-SS-25.0 SW8260B Ethylbenzene 1.4 ug/kg UJ 16-Sep-08 SO Result between MDL and MRL, holding time exceedance

0809068-02B B-02-SS-25.0 SW8260B m,p-Xylene 3.3 ug/kg UJ 16-Sep-08 SO Result between MDL and MRL, holding time exceedance

0809077-02A B-03-GW-27.0 SW8260B Toluene 0.39 ug/L UJ 17-Sep-08 GW Result between MDL and MRL


0809077-04A B-03-GW-65.0 SW8260B m,p-Xylene 0.26 ug/L UJ 18-Sep-08 GW Result between MDL and MRL

0809077-04A B-03-GW-65.0 SW8260B Ethylbenzene 0.46 ug/L UJ 18-Sep-08 GW Result between MDL and MRL

0809078-06B B-03-SS-65.0 SW8260B Naphthalene 2.7 ug/kg UJ 18-Sep-08 SO Result between MDL and MRL

0809086-04A B-04-GW-65.0 SW8260B Naphthalene 0.78 ug/L UJ 19-Sep-08 GW Result between MDL and MRL



0809092-01A B-04-GW-65.0 8270SIM Benzo(a)pyrene 0.0098 ug/L UJ 19-Sep-08 GW Result between MDL and MRL

0809096-04A B-05-GW-65.0 SW8260B Vinyl Chloride 0.95 ug/L UJ 22-Sep-08 GW Result between MDL and MRL



0809097-01A B-05-SS-14.0 8270SIM Dibenz(a,h)anthracene 75.3 ug/kg J 19-Sep-08 SO Holding time exceedance




0809097-01A B-05-SS-14.0 8270SIM Indeno(1,2,3-cd)pyrene 115 ug/kg J 19-Sep-08 SO Holding time exceedance






0809097-01A B-05-SS-14.0 8270SIM Acenaphthylene 96 ug/kg J 19-Sep-08 SO Holding time exceedance





0809097-01A B-05-SS-14.0 8270SIM Benzo(g,h,i)perylene 112 ug/kg J 19-Sep-08 SO Holding time exceedance

0809097-01B B-05-SS-14.0 SW8260B Ethylbenzene 1.1 ug/kg UJ 19-Sep-08 SO Result between MDL and MRL, holding time exceedance

0809097-01B B-05-SS-14.0 SW8260B m,p-Xylene 20 ug/kg UJ 19-Sep-08 SO Holding time exceedance

0809097-01B B-05-SS-14.0 SW8260B Trichloroethene 10 ug/kg UJ 19-Sep-08 SO Holding time exceedance

0809097-01B B-05-SS-14.0 SW8260B Toluene 10 ug/kg UJ 19-Sep-08 SO Holding time exceedance

0809097-01B B-05-SS-14.0 SW8260B Tetrachloroethene 10 ug/kg UJ 19-Sep-08 SO Holding time exceedance

0809097-01B B-05-SS-14.0 SW8260B Naphthalene 551 ug/kg J 19-Sep-08 SO Holding time exceedance

0809097-01B B-05-SS-14.0 SW8260B Vinyl Chloride 10 ug/kg UJ 19-Sep-08 SO Holding time exceedance

0809097-01B B-05-SS-14.0 SW8260B Benzene 10 ug/kg UJ 19-Sep-08 SO Holding time exceedance




0809097-01B B-05-SS-14.0 SW8260B 1,1-Dichloroethene 10 ug/kg UJ 19-Sep-08 SO Holding time exceedance




0809097-01B B-05-SS-14.0 SW8260B o-Xylene 10 ug/kg UJ 19-Sep-08 SO Holding time exceedance

0809097-01B B-05-SS-14.0 SW8260B cis-1,2-Dichloroethene 10 ug/kg UJ 19-Sep-08 SO Holding time exceedance

















































0809106-02B B-06-GW-27.0 D1945Mod. Ethane 100 ug/L UJ 23-Sep-08 GW Result between MDL and MRL

0809106-03A B-06-GW-47.0 SW8260B Toluene 1 ug/L UJ 23-Sep-08 GW Result between MDL and MRL







0809107-01B B-06-SS-14.0 SW8260B 1,1-Dichloroethene 2.4 ug/kg UJ 22-Sep-08 SO Result between MDL and MRL

0809107-01B B-06-SS-14.0 SW8260B Vinyl Chloride 4 ug/kg UJ 22-Sep-08 SO Result between MDL and MRL





0809110-02A B-07-GW-47.0 SW8260B m,p-Xylene 10 ug/L UJ 24-Sep-08 GW Result between MDL and MRL

0809110-02A B-07-GW-47.0 SW8260B o-Xylene 3.8 ug/L UJ 24-Sep-08 GW Result between MDL and MRL























0809111-02B B-07-SS-15.0 SW8260B cis-1,2-Dichloroethene 8.2 ug/kg UJ 24-Sep-08 SO Result between MDL and MRL

0809111-02B B-07-SS-15.0 SW8260B Toluene 5.8 ug/kg UJ 24-Sep-08 SO Result between MDL and MRL

0809111-02B B-07-SS-15.0 SW8260B Trichloroethene 3.3 ug/kg UJ 24-Sep-08 SO Result between MDL and MRL






























0809116-02A B-08-SS-14.0 8270SIM Dibenz(a,h)anthracene 12.7 ug/kg J 24-Sep-08 SO Holding time exceedance






0809116-02A B-08-SS-14.0 8270SIM Acenaphthylene 50.7 ug/kg J 24-Sep-08 SO Holding time exceedance




0809116-02B B-08-SS-14.0 SW8260B Benzene 0.4 ug/kg UJ 24-Sep-08 SO Result between MDL and MRL

0809116-02B B-08-SS-14.0 SW8260B o-Xylene 7.6 ug/kg UJ 24-Sep-08 SO Result between MDL and MRL



















0809116-03B B-08-SS-24.0 SW8260B 1,1-Dichloroethene 2.2 ug/kg UJ 24-Sep-08 SO Result between MDL and MRL


0809116-03B B-08-SS-24.0 SW8260B Vinyl Chloride 7.6 ug/kg UJ 24-Sep-08 SO Result between MDL and MRL

0809117-02A B-10-SS-20.0 8270SIM Benzo(a)pyrene 0.67 ug/kg UJ 25-Sep-08 SO Result between MDL and MRL

0809117-02A B-10-SS-20.0 8270SIM Anthracene 6.7 ug/kg UJ 25-Sep-08 SO Result between MDL and MRL

0809117-02A B-10-SS-20.0 8270SIM Benzo(g,h,i)perylene 2 ug/kg UJ 25-Sep-08 SO Result between MDL and MRL

0809117-02A B-10-SS-20.0 8270SIM Benz(a)anthracene 3.3 ug/kg UJ 25-Sep-08 SO Result between MDL and MRL

0809117-02A B-10-SS-20.0 8270SIM Benzo(k)fluoranthene 1.3 ug/kg UJ 25-Sep-08 SO Result between MDL and MRL

0809117-02A B-10-SS-20.0 8270SIM Chrysene 3.3 ug/kg UJ 25-Sep-08 SO Result between MDL and MRL

0809117-02A B-10-SS-20.0 8270SIM Dibenz(a,h)anthracene 2 ug/kg UJ 25-Sep-08 SO Result between MDL and MRL

0809117-02A B-10-SS-20.0 8270SIM Indeno(1,2,3-cd)pyrene 2 ug/kg UJ 25-Sep-08 SO Result between MDL and MRL

0809117-02A B-10-SS-20.0 8270SIM Naphthalene 2.7 ug/kg UJ 25-Sep-08 SO Result between MDL and MRL

0809117-02B B-10-SS-20.0 SW8260B Naphthalene 5 ug/kg UJ 25-Sep-08 SO Result between MDL and MRL






0809118-01A B-09-SS-18.0 8270SIM Indeno(1,2,3-cd)pyrene 82.7 ug/kg J 25-Sep-08 SO Holding time exceedance















0809118-01B B-09-SS-18.0 SW8260B Trichloroethene 4.9 ug/kg UJ 25-Sep-08 SO Result between MDL and MRL

0809118-01B B-09-SS-18.0 SW8260B Tetrachloroethene 5.2 ug/kg UJ 25-Sep-08 SO Result between MDL and MRL


0809118-01B B-09-SS-18.0 SW8260B Ethylbenzene 8.7 ug/kg UJ 25-Sep-08 SO Result between MDL and MRL





0809125-01A B-11-GW-27.0 SW8260B 1,1-Dichloroethene 0.57 ug/L UJ 26-Sep-08 GW Result between MDL and MRL


0809126-02A B-11-SS-20.0 8270SIM Dibenz(a,h)anthracene 5.3 ug/kg UJ 25-Sep-08 SO Result between MDL and MRL


0809126-02B B-11-SS-20.0 SW8260B m,p-Xylene 3.3 ug/kg UJ 25-Sep-08 SO Result between MDL and MRL









0809133-01A B-12-GW-65.0 SW8260B cis-1,2-Dichloroethene 0.54 ug/L UJ 29-Sep-08 GW Result between MDL and MRL


0809133-01A B-12-GW-65.0 SW8260B Naphthalene 0.49 ug/L UJ 29-Sep-08 GW Result between MDL and MRL

0809133-01B B-12-GW-65.0 8270SIM Acenaphthylene 0.035 ug/L UJ 29-Sep-08 GW Result between MDL and MRL








0809139-02B B-13-SS-15.0 SW8260B o-Xylene 2 ug/kg UJ 29-Sep-08 SO Result between MDL and MRL







































0810008-01A B-14-GW-27.0 SW8260B Ethylbenzene 7 ug/L UJ 01-Oct-08 GW Result between MDL and MRL

0810008-01A B-14-GW-27.0 SW8260B Toluene 3.8 ug/L UJ 01-Oct-08 GW Result between MDL and MRL

0810008-01A B-14-GW-27.0 SW8260B o-Xylene 2.5 ug/L UJ 01-Oct-08 GW Result between MDL and MRL

0810008-01A B-14-GW-27.0 SW8260B m,p-Xylene 5.8 ug/L UJ 01-Oct-08 GW Result between MDL and MRL

0810008-02A B-14-GW-47.0 SW8260B Ethylbenzene 14 ug/L UJ 01-Oct-08 GW Result between MDL and MRL

0810008-02A B-14-GW-47.0 SW8260B m,p-Xylene 20 ug/L UJ 01-Oct-08 GW Result between MDL and MRL

0810008-02A B-14-GW-47.0 SW8260B o-Xylene 7 ug/L UJ 01-Oct-08 GW Result between MDL and MRL


0810009-02A FD-100108 SW8260B Ethylbenzene 7 ug/L UJ 01-Oct-08 GW Result between MDL and MRL

0810009-02A FD-100108 SW8260B m,p-Xylene 5.2 ug/L UJ 01-Oct-08 GW Result between MDL and MRL

0810009-02A FD-100108 SW8260B Toluene 2.8 ug/L UJ 01-Oct-08 GW Result between MDL and MRL






0810009-04A B-14-SS-25.0 8270SIM Benzo(g,h,i)perylene 4.7 ug/kg UJ 30-Sep-08 SO Result between MDL and MRL



0810009-04A B-14-SS-25.0 8270SIM Dibenz(a,h)anthracene 2.7 ug/kg UJ 30-Sep-08 SO Result between MDL and MRL

0810009-04A B-14-SS-25.0 8270SIM Indeno(1,2,3-cd)pyrene 3.3 ug/kg UJ 30-Sep-08 SO Result between MDL and MRL

0810009-04A B-14-SS-25.0 8270SIM Acenaphthylene 2.7 ug/kg UJ 30-Sep-08 SO Result between MDL and MRL


0810009-06A B-14-SS-45.0 SW8260B Naphthalene 104 ug/kg J 01-Oct-08 SO Holding time exceedance

0810009-06A B-14-SS-45.0 SW8260B o-Xylene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-06A B-14-SS-45.0 SW8260B m,p-Xylene 20 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-06A B-14-SS-45.0 SW8260B Tetrachloroethene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-06A B-14-SS-45.0 SW8260B Toluene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-06A B-14-SS-45.0 SW8260B Vinyl Chloride 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-06A B-14-SS-45.0 SW8260B 1,1-Dichloroethane 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-06A B-14-SS-45.0 SW8260B Trichloroethene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-06A B-14-SS-45.0 SW8260B cis-1,2-Dichloroethene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-06A B-14-SS-45.0 SW8260B Benzene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-06A B-14-SS-45.0 SW8260B 1,1-Dichloroethene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance


0810009-06A B-14-SS-45.0 SW8260B 1,1,2-Trichloroethane 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance


0810009-06A B-14-SS-45.0 SW8260B Ethylbenzene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-08A B-14-SS-64.0 SW8260B cis-1,2-Dichloroethene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-08A B-14-SS-64.0 SW8260B Vinyl Chloride 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-08A B-14-SS-64.0 SW8260B Trichloroethene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-08A B-14-SS-64.0 SW8260B Toluene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-08A B-14-SS-64.0 SW8260B Tetrachloroethene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-08A B-14-SS-64.0 SW8260B o-Xylene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-08A B-14-SS-64.0 SW8260B Naphthalene 1.5 ug/kg UJ 01-Oct-08 SO Result between MDL and MRL, holding time exceedance

0810009-08A B-14-SS-64.0 SW8260B Ethylbenzene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810009-08A B-14-SS-64.0 SW8260B Benzene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance




0810009-08A B-14-SS-64.0 SW8260B 1,1-Dichloroethene 10 ug/kg UJ 01-Oct-08 SO Holding time exceedance




0810009-08A B-14-SS-64.0 SW8260B m,p-Xylene 20 ug/kg UJ 01-Oct-08 SO Holding time exceedance

0810019-01A B-15-GW-27.0 SW8260B Ethylbenzene 0.32 ug/L UJ 02-Oct-08 GW Result between MDL and MRL









0810035-02A B-16-GW-45.0 SW8260B cis-1,2-Dichloroethene 0.6 ug/L UJ 03-Oct-08 GW Result between MDL and MRL


0810035-02A B-16-GW-45.0 SW8260B Naphthalene 0.92 ug/L UJ 03-Oct-08 GW Result between MDL and MRL




0810049-01A B-17-GW-47.0 SW8260B Trichloroethene 0.62 ug/L UJ 06-Oct-08 GW Result between MDL and MRL

0810059-03A B-17-SS-65.0 SW8260B Naphthalene 4.7 ug/kg UJ 07-Oct-08 SO Result between MDL and MRL






0810069-01A B-18-GW-65.0 SW8260B 1,1-Dichloroethene 0.72 ug/L UJ 08-Oct-08 GW Result between MDL and MRL













0810093-02A B-20-GW-27.0 SW8260B 1,1-Dichloroethene 0.64 ug/L UJ 10-Oct-08 GW Result between MDL and MRL



0810099-04A FD-101308 SW8260B Naphthalene 0.23 ug/L UJ 13-Oct-08 GW Result between MDL and MRL

0810099-04A FD-101308 SW8260B Toluene 0.97 ug/L UJ 13-Oct-08 GW Result between MDL and MRL

0810100-02A B-21-GW-27.0 SW8260B 1,1-Dichloroethene 8.83 ug/L J 13-Oct-08 GW LCS % recovery was outside limits

0810100-02A B-21-GW-27.0 SW8260B 1,2-Dichloroethane 0.82 ug/L UJ 13-Oct-08 GW Result between MDL and MRL












0810135-04A B-24-GW-27.0 SW8260B Benzene 0.17 ug/L UJ 16-Oct-08 GW Result between MDL and MRL









0810155-01A DROPBOX-C 8270SIM Acenaphthylene 2 ug/kg UJ 22-Oct-08 SO Result between MDL and MRL

0810155-01A DROPBOX-C 8270SIM Naphthalene 6 ug/kg UJ 22-Oct-08 SO Result between MDL and MRL

0810155-01B DROPBOX-C SW1311/826 m,p-Xylene 0.02 mg/L UJ 22-Oct-08 SO Result between MDL and MRL

0810155-01B DROPBOX-C SW1311/826 Toluene 0.008 mg/L UJ 22-Oct-08 SO Result between MDL and MRL

0810155-01B DROPBOX-C SW1311/826 Trichloroethene 0.04 mg/L UJ 22-Oct-08 SO Result between MDL and MRL

0810155-01B DROPBOX-C SW1311/826 Ethylbenzene 0.01 mg/L UJ 22-Oct-08 SO Result between MDL and MRL

0810155-02B DROPBOX-D SW1311/826 Ethylbenzene 0.01 mg/L UJ 22-Oct-08 SO Result between MDL and MRL

0810155-02B DROPBOX-D SW1311/826 m,p-Xylene 0.02 mg/L UJ 22-Oct-08 SO Result between MDL and MRL

0810155-02B DROPBOX-D SW1311/826 Toluene 0.008 mg/L UJ 22-Oct-08 SO Result between MDL and MRL

0810156-02A ODOT-01 SW8260B Tetrachloroethene 0.44 ug/L UJ 22-Oct-08 GW Result between MDL and MRL

0810179-02A B-27-GW-27.0 SW8260B Naphthalene 0.79 ug/L UB, UJ 27-Oct-08 GW Result between MDL and MRL, trip blank exceedance

0810179-02A B-27-GW-27.0 SW8260B Tetrachloroethene 0.35 ug/L UJ 27-Oct-08 GW Result between MDL and MRL





0810179-03A B-27-GW-47.0 SW8260B Trichloroethene 0.56 ug/L UJ 27-Oct-08 GW Result between MDL and MRL






0810187-02A B-28-GW-27.0 SW8260B 1,2-Dichloroethane 0.3 ug/L UJ 28-Oct-08 GW Result between MDL and MRL

0810187-02A B-28-GW-27.0 SW8260B Benzene 0.26 ug/L UJ 28-Oct-08 GW Result between MDL and MRL






0810191-03A B-29-SS-19.0 SW8260B Vinyl Chloride 0.91 ug/kg UJ 28-Oct-08 SO Result between MDL and MRL

0810191-03A B-29-SS-19.0 SW8260B 1,1,2-Trichloroethane 0.98 ug/kg UJ 28-Oct-08 SO Result between MDL and MRL

0810191-03A B-29-SS-19.0 SW8260B Benzene 0.94 ug/kg UJ 28-Oct-08 SO Result between MDL and MRL

0810191-03A B-29-SS-19.0 SW8260B Toluene 3.7 ug/kg UJ 28-Oct-08 SO Result between MDL and MRL

0810191-03A B-29-SS-19.0 SW8260B Trichloroethene 5.3 ug/kg UJ 28-Oct-08 SO Result between MDL and MRL


R E FE R E N C E S

Parametrix. 2008. Quality Assurance Project Plan for Supplemental Site Investigation – Northwest Pipe and Casing Superfund Site. Prepared for the USEPA Region 10. September 2008.

USEPA. 2005. USEPA Contract Laboratory Program National Functional Guidelines for Superfund Organic Methods Data Review. Draft Final. USEPA-540-R-04-009. Office of Superfund Remediation and Technology Innovation (OSRTI). January 2005.

Documents

Focused Field Investigation, Fall 2008 Northwest Pipe and ...Focused Field Investigation, Fall 2008 Northwest Pipe and Casing Superfund Site, Clackamas, Oregon . U.S. Environmental