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7903 TETRA TECH • LOCKHEED MARTIN MIDDLE RIVER COMPLEX •2012 ADDITIONAL BLOCK E SOIL INVESTIGATION REPORT PAGE 1-1

Section 1

Introduction

On behalf of Lockheed Martin Corporation (Lockheed Martin), Tetra Tech Inc. (Tetra Tech) has

prepared the following report documenting a 2012 additional investigation to further identify and

evaluate the horizontal and vertical extent of polychlorinated biphenyls (PCBs), polycyclic

aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs), petroleum hydrocarbons,

and metals in Block E soil at the Lockheed Martin Middle River Complex (MRC) in Baltimore

County, Middle River, Maryland (Figure 1-1). Chlorinated volatile organic compounds

(e.g., trichloroethene [TCE] and trichloroethene degradation products) detected in groundwater

in the eastern portion of Block E are being addressed under separate studies. Evaluation of

Block E soil data indicate widespread detections of polychlorinated biphenyls at levels greater

than the U.S. Environmental Protection Agency’s (USEPA’s) most-protective recommended soil

cleanup level of one milligram per kilogram (mg/kg) (USEPA, 1990 and 2005), with higher

concentrations found in some soil borings both within and outside of the former Building D

footprint.

Prior data indicate elevated concentrations of polychlorinated biphenyls in the southwestern

portion of the former Building D, with the highest polychlorinated biphenyl concentrations of

19,000 and 24,000 milligrams per kilogram at depths between seven and 12 feet below grade.

Volatile organic compounds in this area appear to be commingled with the polychlorinated

biphenyl contamination. Polychlorinated biphenyls are also found at the locations of former

cleaning and plating rooms where lubricating or cutting oils may have been used, and south of

the former Building D in the area of a former fuel storage tank.

Polycyclic aromatic hydrocarbons have also been detected in storm-drain sediments and in

surface soil and subsurface soil (e.g., greater than 10 feet deep) at the site. Volatile organic

compounds and metals have likewise been detected in soil at levels exceeding risk screening


criteria. However, polychlorinated biphenyls are most widespread in Block E, and account for

most potential risk to human health from contaminants at the site.

The federal Toxic Substances Control Act (TSCA) requires that the extent of site contamination

is identified to evaluate remedial alternatives. The primary objective of this Block E

investigation is to better identify and evaluate the horizontal and vertical extent of

polychlorinated biphenyls, polycyclic aromatic hydrocarbons, volatile organic compounds,

petroleum hydrocarbons, and metals in soils. These data will be used in an updated human health

risk assessment and in remedy selection. A secondary objective is to better understand the

existing concrete slab underlying the former Building D, and its possible influence on impacted

soils and their possible migration pathways.

A concurrent radiological survey and sampling program was undertaken at Block E during the

sampling described herein. Objectives were to assess worker safety and identify whether

radioactive constituents remain from past activities at a former nuclear laboratory that once

operated in the basement of Building D. The methods and results of the Block E radiological

program are included in Appendix A.

The 2012 Block E program entailed the following activities:

performed high-resolution, subsurface, electrical resistivity imaging, focusing within thesouthwest quadrant of the former Building D that covered approximately 600 feet by270 feet, with a 1.5-meter electrode, 60-foot grid-spacing, and obtaining 18 images to amaximum depth of 55 feet below grade

collected concrete surface samples at 40 locations from the former Building D concreteslab to evaluate current risk to site workers from exposure to polychlorinated biphenyls.Six concrete samples were also analyzed for asbestos for waste characterization purposes.

advanced shallow soil borings at 28 locations to four feet below grade to furtherinvestigate polychlorinated biphenyls and polycyclic aromatic hydrocarbons in soil alongthe periphery of the former Building D foundation. Metals were also sampled at seven ofthese locations.

advanced deep soil borings at six locations (based on the geophysical survey results) todepths of 40–50 feet below grade to further characterize polychlorinated biphenyls,polycyclic aromatic hydrocarbons, volatile organic compounds, total petroleumhydrocarbons, and metals in soil in areas near the former waste disposal area and formertransformer room


collected 77 samples from concrete, surface, and shallow soil, including background soiland concrete samples, and analyzed for isotopic uranium and thorium (Appendix A)

collected shallow groundwater samples from soil borings for chemical analyses and field-parameter measurements

collected groundwater levels from Block E wells

performed laboratory chemical analyses and chemical-data validation of soil samples

additionally, reviewed historical maps and figures to gain insight into the constructionand locations of underground utilities at former Building D, and to assess historicaloperations that may have led to the release of the identified contaminants of concern(COC).

This report is organized as follows:

Section 2Site Background: Briefly describes site history, subsurface conditions, andprevious investigations.

Section 3Investigation Approach and Methodology: Describes the investigation’s technicalapproach and field methodologies.

Section 4Results: Discusses the data evaluation and results for the 2012 investigation andthe site-wide distributions of primary site contaminants.

Section 5Block E Southwestern Area Conceptual Site Model for PolychlorinatedBiphenyls: Develops a conceptual site model describing site conditions, past operations, andpotential pathways to evaluate the current distribution of polychlorinated biphenyls in thesouthwestern portion of Block E

Section 6Summary: Summarizes the investigation findings.

Section 7References: Cites references used in compiling this report.

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Middle River

Frog Mortar Creek

Stansbury CreekDark Head

Cove

Martin State Airport

Eastern Boulevard

Cow Pen Creek

Middle River Complex

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Miles

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Middle River

±DATE MODIFIED: CREATED BY:

4/28/11 MP

Lockheed Martin Middle River ComplexMiddle River, Maryland

FIGURE 1-1

MIDDLE RIVER COMPLEX

LOCATION MAP

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Map Document: (K:\GProject\middle_river\Maps\MiddleRiver_MRC_Location Map_042811.mxd)4/28/2011 -- 11:09:59 AM


Section 2

Site Background

2.1 MIDDLE RIVER COMPLEX BACKGROUND

2.1.1 Location

The Middle River Complex (MRC), part of the Chesapeake Industrial Park, is at 2323 Eastern

Boulevard in Middle River, Maryland, approximately 11.5 miles northeast of downtown

Baltimore. The MRC covers approximately 161 acres and is comprised of 12 main buildings, an

active industrial area and yard, perimeter parking lots, an athletic field, a vacant concrete lot, a

trailer and parts storage lot, and numerous grassy spaces along the perimeter (Figure 2-1). The

MRC is bounded by Eastern Boulevard (Maryland Route 150) to the north, Dark Head Cove to

the south, Cow Pen Creek to the west, and Martin State Airport to the east. As shown in

Figure 2-1, the property is currently divided into eight tax parcels (Tax Blocks A, B, and D

through I).

2.1.2 History and Operations

In 1929, Glenn L. Martin Company, a Lockheed Martin Corporation (Lockheed Martin)

predecessor entity, acquired a large parcel of undeveloped land in Middle River, Maryland, to

manufacture aircraft for the United States government and commercial clients. In the early

1960s, Glenn L. Martin Company merged with American-Marietta Company to form Martin

Marietta Corporation. Around 1975, the adjacent eastern airport (Martin State Airport), totaling

approximately 750 acres, was transferred to the State of Maryland. In the mid-1990s, Martin

Marietta merged with Lockheed Corporation to form Lockheed Martin Corporation, specializing

in equipment fabrication and testing for the United States government and commercial clients.

Shortly after the merger, General Electric Company acquired most of Lockheed Martin’s

aeronautical business in Middle River and its subsidiary, MRA Systems, Inc., and began

operating on site as Middle River Aircraft Systems (MRAS).


Lockheed Martin subsidiary LMC Properties, Inc., (LMCPI) is the present owner of the site.

LMCPI site activities include facility and building management and maintenance. Two principal

tenants occupy the site: MRAS and Mission Systems & Sensors—Ships & Aviation Systems

(MS2—S&AS). MRAS designs, manufactures, fabricates, tests, overhauls, repairs, and

maintains aeronautical structures, parts, and components for military and commercial

applications. MS2—S&AS, a division of Lockheed Martin Corporation, designs systems for sea

and airborne applications.

2.1.3 Surrounding Land Use

The MRC is an industrial facility surrounded primarily by commercial, industrial, and residential

establishments (see Figure 2-1). Six facilities adjacent to the MRC comprise the remaining

portion of the Chesapeake Industrial Park. These include Tilley Chemical Company, Inc. (a food

and pharmaceutical chemical distributor), North American Electric, Inc. (an industrial and

commercial electrical contractor), Johnson and Towers (a heavy-duty automotive and boat repair

and maintenance company), Poly Seal Corp. (a flexible-packaging producer), Exxon (a gasoline

filling station and convenience store), and the Middle River Post Office. Residential

developments are on the opposite shores of Cow Pen Creek, Dark Head Cove, and Dark Head

Creek, and north of Eastern Boulevard (Route 150).

2.1.4 Physiography

Tax Block E lies in the Western Shore of the Coastal Plain physiographic province. Coastal Plain

topography is generally characterized by low relief. The MRC’s topography slopes gently from

approximately 32 feet above sea level down to sea level. The topography slopes from Eastern

Boulevard to the southwest and south toward Cow Pen Creek and Dark Head Cove.

2.1.5 Soils

Soils underlying the MRC have been mapped by the United States Department of Agriculture

(USDA) Soil Conservation Service as Mattapex-Urban Land Complex and Sassafras-Urban

Land Complex. Mattapex-Urban Land soils consist of deep, well-drained, silty soils, the original

texture of which has been disturbed, graded over, or otherwise altered before construction.

Sassafras-Urban Land soils consist of deep, well-drained, sandy soils, the original texture of

which has been disturbed, graded over, or otherwise altered before construction (USDA, 1993).


MRC site assessments, however, indicate that soils in many areas of the site contain very high

clay and silt content, with poor surface drainage.

2.1.6 Hydrology

The MRC is at the junction of Cow Pen Creek and Dark Head Cove (see Figure 2-1). Both of

these surface water bodies discharge into Dark Head Creek, a tributary to Middle River, which is

a tributary to Chesapeake Bay. The MRC is approximately 3.24 miles (17,100 feet) upstream of

Chesapeake Bay.

The MRC has no surface water bodies on site. Excluding areas immediately adjacent to Cow Pen

Creek and Dark Head Cove, surface-water runoff discharges from the facility via storm drains.

Lockheed Martin maintains a National Pollutant Discharge Elimination System (NPDES) permit

(state discharge permit No. 00-DP-0298, NPDES No. MD0002852) issued by the Maryland

Department of the Environment (MDE) Industrial Discharge Permits Division, Water

Management Administration. The permit covers storm water discharge from the entire property,

rather than from individual tenants.

2.1.7 Geology

Geologic mapping of Baltimore County shows that the MRC is underlain by the Potomac Group,

a Cretaceous Age interbedded gravel, sand, silt, and clay unit ranging from zero to 800 feet thick.

The Potomac Group is composed of three units: the Raritan and Patapsco Formations, the

Arundel Clay, and the Patuxent Formation. The Raritan and Patapsco Formations range up to

400 feet thick and are composed of a gray, brown, and red variegated silt and clay unit with

lenses of sand and few gravels. The Arundel Clay is composed of dark gray and maroon

lignitic-clays ranging from 25 to 200 feet thick. The Patuxent Formation is described as a white

or light gray to orange brown, moderately sorted sand unit with quartz gravels, silts, and clays up

to 250 feet thick.

Lithologic logging of the soils beneath the MRC has identified a very heterogeneous

stratigraphy. Figure 2-2 shows the locations of geologic cross-sections constructed for the MRC.

Figures 2-3 through 2-5 are generalized geologic cross-sections showing the materials

encountered during the drilling of the MRC wells, including four deep wells (MW-93D,

MW-94D, MW-95D, and MW-96D).


Overall, the investigation results indicate complex arrangements of predominantly clay, silty

clay, silt, and clayey silt, with smaller, more permeable zones of silty sand and sand. Thick

sequences of low permeability clay, silty clay, clayey silt, and silt are found in the northern

two-thirds of the MRC. These clayey and silty materials extend from MW-3 to the area between

MW-60 and MW-94D.

As shown in Figure 2-3, the lithologic data for MW-93D, MW-94D, and MW-96D indicate clay

up to 50 feet thick underlying the surficial aquifer at 15 to 60 feet below mean sea level (msl) at

well MW-93D, and 60 to 110 feet below msl at MW-94D and MW-96D. Below this clay zone is

a series of thinner alternating layers of sand and clay. Seventy-three feet of continuous clay were

encountered at MW-93D, beginning at an elevation of 164 feet below msl and ending at an

elevation of approximately 237 feet below msl.

Directly overlying the 73 feet of clay is seven feet of sand, followed by 11 feet of overlying clay

and sand layers (clay thickness totaling eight feet) from 146 to 157 feet below msl. Below the

73-feet-thick clay layer is 14 feet of silty and clayey fine sand, followed by 15 feet of clay from

251 to 266 feet below msl. The thickness of the deep clay and interlayer sand/silt (123 feet) is

consistent with the Arundel Formation’s thickness (50 to 125 feet) in this area, as reported by

Chapelle (1985) and Vroblesky and Fleck (1991). However, the basal altitude of the clay (at

266 feet below msl) is somewhat lower than the altitude of 200 feet below msl reported by these

two sources.

In the northern portion of the site (Figure 2-3), clay is encountered in the first 25 feet at

MW-93D, thickening to approximately 40 feet to the south at well MW-57 near Building C.

Boring logs indicate that this thick upper zone of clayey material terminates to the south along an

east–west line formed roughly by MW-27, MW-25, and MW-22. Interbedded sands, silty sands,

sandy silts, and silts are encountered south of Buildings A, B, and C (Figure 2-2). Several feet of

sandy and silty materials overlie the shallow clay at MW-55 and MW-57 (Figure 2-3). These

sandy and silty materials thicken to the south/southeast in the area of MW-60, MW-27, MW-79,

and MW-34. The sandy materials are approximately 50 to 60 feet thick in the area from MW-27

to MW-34 and overlie a lower clay confining-unit at 55 to 60 feet below msl.


In the southwestern portion of the MRC (Figures 2-4 and 2-5), silty sands and sandy silts are

encountered in the upper several feet of subsurface soil in the area of wells MW-12 to MW-56,

to the northeast. A lower sandy unit at 50 feet below msl at MW-14 appears to be contiguous

with sand encountered at MW-12 and MW-95D to the southwest. The upper silty sand unit and

the lower sand unit are separated by approximately 30 to 35 feet of clay and/or silt.

Figure 2-4 also indicates geologic sequences at well MW-95D similar to those of MW-93D.

Similar to MW-93D, the lithology at MW-95D shows primarily clay from the ground surface to

50 feet below msl, followed by a thick sand zone (split by clay and silt layers) from

approximately 60 feet below msl to approximately 140 feet below msl. At MW-95D, relatively

continuous clay is encountered at approximately 150 to 226 feet below msl. However, a

14-feet-thick sand layer was encountered in MW-95D from approximately

190 to 204 feet below msl. Thick clay layers are above and below the sand units monitored by

the deep wells at all MRC deep-well locations. The sand zones monitored by the deep wells are

therefore considered hydraulically confined.

2.1.8 Hydrogeology

Sand and gravel zones in the unconsolidated surficial deposits, when present, may form an

unconfined or water table aquifer system (Bennett and Meyer, 1952). The water table at the

MRC generally conforms to the land surface, with the highest water levels in the interior land

areas and the lowest levels at approximately the surface water elevations along the shoreline. The

Patuxent Formation is the most important water-bearing formation in the Baltimore area.

Industrial wells in the southeastern part of the area, specifically Curtis Bay and Sparrows Point,

yield from 500 to 900 gallons per minute (gpm). Transmissivities and storage coefficients in

confined portions of the aquifer in these industrialized areas average about 50,000 gallons per

day per foot (g/d/ft) and 0.00026 (unitless), respectively.

The Patapsco Formation is also an important water-bearing formation in industrialized Baltimore,

where it is separated by clay into a lower and upper aquifer. The lower aquifer yields as much as

500 to 750-gpm to industrial wells, with an estimated transmissivity of 25,000 g/d/ft (Bennett and

Meyer, 1952). The upper aquifer yields quantities of water similar to industrial wells, and likely

has a higher overall transmissivity because it is thicker than the lower aquifer.


Groundwater at MRC is encountered at depths ranging from less than one foot to nearly

18 feet below ground surface (bgs). To the southeast, groundwater preferentially flows to the

southeast within sandy strata, which extend from MW-55 and MW-57, toward the thicker sandy

material at MW-27 and MW-37. Approximately 65 to 70 feet of saturated sandy material lies

above the lower confining-clay in this area.

The lower portion of the aquifer in the area of MW-34 and MW-37 is divided by silt and silty

clay at 20 to 30 feet below msl. Deeper groundwater may be under hydraulically confined

conditions in this area. To the southwest, shallow groundwater flows through the sandy and silty

materials that extend from MW-21 to MW-12 and Cow Pen Creek. Approximately 13 to 18 feet

of saturated sandy material is in this area.

Single-well permeability tests (slug tests) were conducted in 2005 in 28 wells selected to

represent variability across the site. The average hydraulic conductivity (i.e., soil permeability)

reported for the shallow wells is low, ranging from 0.0027 feet per day (ft/d) at MW-57 to

1.25 ft/d at MW-66A. The arithmetic-average hydraulic conductivity for the shallow wells is

0.22 ft/d. These results are consistent with published permeabilities of sand and silt mixtures

(Spitz and Moreno, 1996; Halford and Kuniansky, 2002) reported for these locations. Lower

hydraulic conductivities were reported for shallow wells to the south (MW-55A through

MW-62A) and west (MW-52A through MW-54A, and MW-64A).

Except for MW-27B, hydraulic conductivity values for the intermediate wells are more

consistent than those of the shallow wells, with an arithmetic average of 0.48 ft/d and a

geometric mean of 0.22 ft/d. The intermediate-well permeabilities are consistent with lower

values for clean sand or typical values of sand and silt mixtures. Hydraulic conductivities for the

deep wells (except for well MW-37C) range from 0.35 to 9.16 ft/d. The average

hydraulic-conductivity of the deeper wells (3.82 ft/d) is approximately 10 times the average

hydraulic conductivity for the shallow and intermediate zones. The geometric-mean hydraulic

conductivity for deep wells is 0.89 ft/d; if the low permeability at MW-37C is eliminated as an

outlier, the geometric-mean hydraulic conductivity is 3.02 ft/d.


2.2 BLOCK E SITE CHARACTERISTICS

2.2.1 History and Operations

The MRC has been used historically to design, develop, assemble, and test aircraft and missile

launching systems. Block E (15.97 acres), in the southern portion of the MRC (Figure 2-1), is the

site of former Building D. It was built in the early 1940s for final assembly of aircraft frames and

demolished between 1970 and 1974 according to available records. The building had an

assembly floor (first floor) and a basement (current concrete slab) and occupied approximately

400,000 square feet. Figure 2-6 shows former Building D as it existed in 1944.

Historical engineering maps obtained from files at the MRC show the former basement areas

were used for welding, extrusion milling, engine preparation, and assembly (Figure 2-7). Former

elevators and former heater rooms are shown along the interior northern, eastern, and southern

perimeter areas and former electrical transformer rooms are shown along the interior northern

and southern building perimeter areas. As shown in the engineering maps, the northwestern and

southwestern portions of the basement housed several nuclear-related offices and laboratories.

The maps also show cleaning, plating, and finishing work areas along the southern interior wall

near the building’s center, and waste disposal and radioisotope outbuildings in the southwestern

corner of Building D.

Former Building D occupied approximately half of Block E. The building foundation remains and

appears to be composed of relatively intact concrete slabs (Figure 2-7). Ceramic tiles overlie the

concrete foundation in areas corresponding to the former cafeteria, cleaning/plating, and finishing

rooms.

The area occupied by former Building D has not been redeveloped since the building was

demolished. No records have been found regarding when the demolition of Building D occurred.

Evidence suggests that Building D was demolished sometime between 1970 and 1974. Building D

was present in a 1970 aerial photograph but not in a 1974 aerial photograph. Nuclear Regulatory

Commission records indicate that the pre-decontamination and post-contamination survey of the

Building D was performed in 1970 to support the facility decontamination license application.

Portions of the former Building D area currently store lowboy trailers and airplane carcasses

belonging to the Martin State Airport air museum. A shed to store sand and road salt is in the


northwestern corner of the former Building D footprint. A 500,000-gallon aboveground storage tank

(AST) and pump-house are in the southeastern corner of Block E. The tank stores water as a backup

supply for the MRC fire suppression system. Tilley Chemical Company stores tractor-trailers on the

concrete apron in the southwestern corner of Block E.

2.2.2 Block E Recognized Environmental Conditions andContaminants of Concern

Three recognized environmental conditions (RECs) identified in the Phase I environmental site

assessment (ESA) are in Block E: REC #1 (former Building D), REC #2 (product pipeline), and

REC #3 (former 500,000-gallon AST and associated tanks). The product pipeline (REC #2) is a

1,815-foot long, two-inch-diameter pipe running underground from a former 500,000-gallon diesel

fuel oil AST (REC #3) to the MRC power plant in Block I. The former 500,000-gallon fuel AST

and associated tanks of REC #3 were on a grassy shoulder in the southeastern portion of Block E,

directly west of the current water AST and pump house (Figure 2-7). The 500,000-gallon fuel AST

was surrounded by a shallow, grassy, earthen berm.

A human health risk assessment (HHRA) for Block E soil (Tetra Tech, 2012a) identified

polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), and the volatile

organic compounds (VOCs) 1,2,3-trichlorobenzene (123-TCB), 1,2,4-trichlorobenzene

(124-TCB), and 1,4-dichlorobenzene (14-DCB) as primary contaminants of concern (COC) for

Block E soil. Arsenic (As) and hexavalent chromium (CrVI) were also identified as COC, but

arsenic concentrations were considered to represent background concentrations and account for

less overall risk than the other COC. Groundwater along the eastern portion of Block E also

contains chlorinated VOCs (i.e., the degreasing solvent trichloroethene [TCE], and breakdown

products dichloroethenes and vinyl chloride [VC]) at concentrations above Maryland

groundwater standards.

2.3 SUMMARY OF BLOCK E INVESTIGATIONS

Earlier Block E environmental investigations date from 2003 and include record reviews,

discussions with MRC personnel, geophysical surveys, and chemical analyses of soil, concrete,

storm sewer sediment, and groundwater samples. An HHRA, a subsurface utility

cross-connection (UCC) study, and an interim remedial measure (IRM) removal action for the

storm sewer have been completed. The results of these environmental studies and the HHRA


indicate that several constituents are in soil, concrete, sediment, and groundwater at Block E at

concentrations exceeding human-health risk-based levels. The HHRA found that the primary

COC in Block E include:

PCBs in concrete

PCBs, PAHs, VOCs, and metals in soil and storm sewer sediment

VOCs (TCE and TCE-degradation products) in groundwater

VOCs in groundwater in the eastern portion of Block E are being addressed under separate

studies, so this report does not include tasks to investigate VOCs in groundwater at Block E.

Although not a COC in groundwater, Aroclor-1254 (a PCB) was detected in 2011 in a

groundwater sample from well MW-43A at a concentration of 0.24-micrograms per liter (µg/L),

which is below the Maryland groundwater standard of 0.5 µg/L. PCBs were not detected in the

groundwater sample collected from well MW-43A in 2012.

Block E studies to date include:

Phase I Environmental Site Assessment (ESA) (Earth Tech, Inc., 2003)

Phase II Site Investigation of Exterior Areas (Tetra Tech, Inc. [Tetra Tech], 2004a)

Radiological Survey, Building D (REC #1) (Tetra Tech, 2004b)

Site-Wide Phase II Investigation (Tetra Tech, 2005)

Phase II Soil Investigation (included in Tetra Tech, 2006)

Site Characterization (Tetra Tech, 2006)

Additional Field Investigation (Tetra Tech, 2011)

Supplemental Soil and Storm Drain Sediment Characterization (Tetra Tech, 2010)

Data Gap Investigation (Tetra Tech, 2011)

Human Health Risk Assessment for Blocks D, E, F, G, and H Soils (Tetra Tech, 2012a)

Additional Block E Soil Characterization Report (Tetra Tech, 2012b)

Human Health Risk Assessment Update for Block E Soils (Tetra Tech, 2012c)

Utility Cross-Connection Report (Tetra Tech, 2012d)


Block E Storm Drain System Interim Remedial Measures Final Site Remediation Report(Tetra Tech, 2012f)

Injection Pilot Test Report (Tetra Tech, 2012g)

Block E and G Pre-Design Soil Sampling Investigation Report (Tetra Tech, 2012h)

Concrete and soil samples were also collected from Block E in 2012 and analyzed for radiation

and radionuclides. Results of that study will be presented in a separate report. Details of the

studies listed above are provided in the following sections. Details are also provided in tabular

form in chronological order (Table 2-1).

2.3.1 Phase I Environmental Site Assessment (Winter 2003)

Earth Tech, Inc. (Earth Tech) conducted a Phase I ESA of the MRC in February 2003

(Earth Tech, 2003). It consisted of a historical review of the MRC (i.e., a review of MRC

documents, aerial photographs, and city directories), a review of federal, state, and local agency

databases, interviews with MRC personnel, and a site visit. The Phase I ESA identified 13 RECs

at the MRC, including the three RECs in Block E (REC #1, REC #2, and REC #3). The Phase I

ESA also recommended further investigation into the MRC’s historical activities to identify other

potential environmental concerns.

2.3.2 Phase II Site Investigation of Exterior Areas (Fall/Winter 2003)

Tetra Tech conducted a Phase II investigation in autumn 2003 consisting of soil and groundwater

sampling and analysis and a geophysical survey of seven of the 13 Phase I ESA RECs (Tetra

Tech, 2004a). The objective of the Phase II investigation was to determine baseline conditions by

identifying and evaluating contaminants of potential concern (COPC) in the underlying

environmental media. Six soil borings (SB-1 through SB-6) were advanced within the footprint

of former Building D to determine baseline conditions at REC #1. The depths of these borings

ranged from 10 to 24 feet below grade. Two soil samples were collected from each boring (at

five and 10 feet below grade) and analyzed for VOCs, semivolatile organic compounds

(SVOCs), total petroleum hydrocarbon (TPH)-diesel-range organics (DRO), TPH-gasoline-range

organics (GRO), PCBs, and metals.

To assess the product pipeline and any possible releases from the pipeline, 10 soil borings

(SB-9 through SB-18) were advanced along its entire length (not including the section in a


concrete utility trench). A soil sample was collected from five feet below grade at each soil

boring. All samples were analyzed for benzene, toluene, ethyl benzene, and xylenes (BTEX),

naphthalene, and TPH-DRO.

Three soil borings (SB-19 through SB-21) were advanced at REC #3 during the 2003

investigation. Soil borings SB-19 and SB-21 were advanced within the footprint of the

500,000-gallon AST, and SB-20 was advanced within the footprint of the 500-gallon

underground storage tanks (UST). Two soil samples (five and 10 feet below grade) were

collected from each boring and analyzed for BTEX, naphthalene, and TPH-DRO.

VOCs, PAHs (expressed as a benzo(a)pyrene equivalent [BaPEq]), TPH-GRO, and various

metals were detected in soil samples collected in 2003. Arsenic and benzene were the only

compounds detected at concentrations exceeding Maryland Department of the Environment

(MDE) screening levels. The results of the 2003 investigation, including figures of sampling

locations, are in the Final Report Phase II Site Investigation of Exterior Areas, Volumes I and II

(Tetra Tech, 2004a). PCBs were not detected in excess of the one-milligram per

kilogram (mg/kg) screening level in any of the samples collected for the 2003 investigation.

2.3.3 Radiological Survey of Former Building D (REC #1) (Winter 2004)

A radiological survey of REC #1 (former Building D) in March 2004 (Tetra Tech, 2004b) sought

to determine if radiological activities possibly conducted in Building D had affected the

underlying environmental media. The survey focused on the remaining former Building D

foundation slab where suspected nuclear activities (possibly involving uranium, plutonium, and

strontium, as well as other isotopes) may have occurred. A cobalt-60 source was also located in

the wet lab. The radiological survey covered two areas where isotopes were known to have been

used, based on information from MRC personnel who had been present during such operations in

the late 1950s–1960s. The primary area was in the southwestern portion of the building, along

the southern exterior wall; the secondary area was immediately north of the first area, along the

western exterior wall of former Building D.

The radiological survey used alpha and beta monitors and a gamma-radiation survey instrument,

which was deemed appropriate for detecting the suspected radioisotopes of concern. The work

began with a survey of a 10-foot by 10-foot area near the center of the former Building D


foundation using a beta/gamma monitor to verify background radiation levels. After these levels

were established, 11 areas of the building foundation were surveyed, in the areas of reported

radionuclide use in the southwestern and western sections of the building.

Walkover gamma surveys were performed over most of the former Building D floor surface to

identify any areas where radiation levels may exceed background levels. Alpha and beta

floor-monitor measurements revealed no areas with readings significantly above background;

however, three areas had gamma readings above background. None of the elevated levels appear

likely to have presented an exposure risk to a full-time worker. Two areas were in places where

portions of the concrete slab had either been removed or had deteriorated to the point where

grass was growing. The third area was above brick tiles on top of the foundation slab. Two of

these three areas did not appear to be associated with a particular source or activity.

Elevated readings in the third area may be the result of naturally occurring radiation common to

building material, such as brick tiles. These areas were sampled for purposes of laboratory

analysis as part of the site-wide Phase II investigation. The results of the radiological survey and

soil sample radiological analyses are in the Radiological Survey Report for Former Building D

(Tetra Tech, 2004b).

2.3.4 Site-Wide Phase II Investigation (2004)

All 13 RECs were investigated during the site-wide Phase II investigation, including geophysical

surveys of five areas, plus soil and groundwater sampling. The 2004 Block E investigation was

limited to soil and groundwater sampling. Eight surface soil samples and two subsurface soil

samples were collected from the former Building D footprint and analyzed for VOCs, SVOCs,

PCBs, perchlorate, total and dissolved metals, and TPH-DRO and TPH-GRO. Six of the surface

soil samples (SB-1A through SB-6A) were collected in the same areas where soil borings had

been advanced in the 2003 Phase II investigation.

Two new borings (SB-35 and SB-36) were advanced within the footprints of the clean plating

shop (SB-35) and the finishing shop (SB-36). Samples were obtained from the surface and

between four to five feet below grade at these two new locations. Six radiological surface-media

samples were collected from the three gamma anomalies identified during the radiological

survey (SB-41 through SB-43) and submitted for gamma spectroscopy analysis. The only


radiological parameters detected in the soil boring samples from the former Building D footprint

were naturally occurring metal nuclides such as cesium-137 (0.145 picocuries per gram [pCi/g]

in SB-41) and actinium-228 (at concentrations of 0.95 and 1.02 pCi/g in SB-43 and SB-42,

respectively).

Several VOCs, PAHs, TPH-DRO, TPH-GRO, PCBs (specifically Aroclor-1260), and metals

were detected in REC #1 soil samples collected in the 2004 investigation. The only chemicals

exceeding MDE soil screening levels were PCBs, TPH-DRO, and chromium in surface soils, and

arsenic in subsurface soils. Chromium slightly exceeded its MDE anticipated typical

concentration (ATC) (28 micrograms per kilogram [µg/kg]) in surface soil samples, but not in

subsurface samples; this most likely represents background conditions rather than impacts from

former activities at what is now an REC. Sampling locations where PCBs exceeded the 1 mg/kg

screening level are shown in Figure 2-8. The results of the aforementioned sample analyses and

sampling location figures are in the Final Data Report, Site-Wide Phase II Investigation

(Tetra Tech, 2005).

2.3.5 Phase II Soil Investigation (Summer 2005)

To further delineate the elevated levels of PCBs detected in 2004, SB-4A was re-sampled from

one to two feet below grade in 2005. Four new borings (SB-232 through SB-235) were advanced

approximately 60 feet from SB-4A. Two samples (from zero- to one-foot and

one-foot to two-feet below grade) were collected from each boring; these samples were analyzed

for PCBs and found to contain the common PCBs Aroclor-1242 and Aroclor-1260. Sampling

locations and the results of this investigation are in the Site Characterization Report (Tetra

Tech, 2006). Sampling locations with PCB concentrations exceeding the 1 mg/kg screening level

are shown in Figure 2-8.

2.3.6 Site Characterization Report (May 2006)

The Site Characterization Report (Tetra Tech, 2006) summarizes the data collected for all

environmental media through 2005, including the Phase II Soil Investigation results discussed in

the preceding section. The study compared the chemical results detected in soil samples against

natural background concentrations. It also includes a human health risk assessment (HHRA) that

identified potential human health effects posed by exposure to site chemicals under a number of


current and hypothetical land use scenarios. Results of the site-specific HHRA helped determine

which COPC are the principal contributors to potential human health risk and should thus be

considered contaminants of concern (COC). After comparison to natural background

concentrations in the HHRA, arsenic (identified as a COPC in Block E and Parking Lot No. 3

soil) was not retained as a COC. PAHs (expressed as BaPEq), PCBs, and TPH-DRO and

TPH-GRO in surface and subsurface soils were identified as COC for Block E.

2.3.7 Additional Field Investigation (Fall 2007)

An additional field investigation in fall 2007 sought to confirm previous results and delineate

areas of concern in Block E. Initially, 20 surface samples (SB-345 through SB-364) were

collected in a grid pattern around SB-4A to evaluate the extent of PCB impacts. All samples were

collected from the slab joints and cracks of the former Building D concrete slab and analyzed for

PCBs. Twenty-one soil borings (SB-500 through SB-520) were advanced across the former

Building D footprint to a maximum depth of 12 feet below grade. The concrete is approximately

eight inches thick and contains reinforcing steel. Most of the soil samples were collected after

coring through the concrete slab. These samples were analyzed for PCBs, VOCs, SVOCs, metals

(including iron, manganese, and mercury), and for TPH-DRO and TPH-GRO.

An additional 20 surface soil samples (SB-521 through SB-540) were obtained from around five

storm sewer manholes south of former Building D. Storm sewer piping runs parallel to the

former building, with manholes 175 feet apart. Four soil samples were collected around each

manhole and analyzed for PCBs.

PCB concentrations were greater than the risk-based screening level (1 mg/kg) in 52 of 61 soil

samples collected from zero to 10 feet below grade; most of the samples containing exceedances

were collected from surface soils. Aroclor-1260 was the only PCB detected, at concentrations

ranging from non-detect to a maximum of 1,800 mg/kg in the surface soil sample from location

SB-353. Aroclor-1260 was also elevated in soil samples collected between the concrete floor

slabs in the area of former Building D.

BaPEq concentrations in soil samples ranged from non-detect to a maximum of 7,600 µg/kg at

SB-503. BaPEq concentrations above its screening level (150 µg/kg) were detected in most soil

samples. Thirty of 60 exceedances were calculated from analytical results with elevated detection


limits. In those cases, one-half the detection limit (of each constituent associated with an elevated

detection limit) was used as proxy in the calculation, resulting in an approximation that may or

may not represent a true exceedance. Twenty samples exceeding screening levels were collected

in and around REC #1, REC #2, and REC #3.

None of the other constituents, including metals, was detected in site soils above screening

levels, except TPH, which exceeded its screening level (230 mg/kg) at one location

(SB-503-0001) with a concentration of 650 mg/kg. Sampling locations with PCB exceedances

above the 1 mg/kg screening level are shown in Figure 2-8. Sampling locations and the results of

this investigation are in the Block E Data Summary Report (Tetra Tech, 2011).

2.3.8 Supplemental Soil and Storm Drain Sediment CharacterizationReport (Fall 2008)

The 2008 supplemental soil and storm drain sediment characterization study (Tetra Tech, 2010)

focused on defining the extent of PCB impacts in Tax Block E and Parking Lot No. 3 soil and

associated storm sewer sediment, based on the areas identified in the Site Characterization

Report (Tetra Tech, 2006). Forty soil borings were advanced in REC #1 using direct push

technology (DPT) in areas where the horizontal extent of PCB impacts had not been completely

bounded, and the vertical extent of PCB impacts below the shallow sampling depth

(i.e., 1–2 feet below grade) was unknown. Thirty-one borings were advanced during the first

phase (SB-541 through SB-571) and nine during the second phase (SB-541A, SB-543A,

SB-544A, SB-546A, SB-550A, SB-555A, SB-561A, SB-568A and SB-570A). One-hundred

sixty-one soil samples, including duplicates, were collected from the soil borings and analyzed

for PCBs at a fixed-base laboratory.

The chemical analytical results confirmed the presence of PCBs (including Aroclor-1016, -1254,

and -1260) in 58 soil samples. Aroclor-1260 concentrations range from non-detect to a maximum

of 300 mg/kg (SB-569-0-0.5). Aroclor-1260 was detected in surface soil samples from across the

former Building D site wherever samples were collected. Fifteen soil samples exceeded the

screening level at that time. PCB concentrations for several deeper-depth samples, including

SB-555A-12 (0.71 mg/kg), SB-555A-14 (0.038 mg/kg), and SB-570A-10 (0.034 mg/kg), did not

exceed the screening level; however, a PCB exceedance was seen in SB-555A-12. PCB

concentrations exceeding the 1 mg/kg screening level are shown in Figure 2-8.


2.3.9 Data Gap Investigation (Fall 2010)

The Block E Data Summary Report (Tetra Tech, 2011) summarizes the 2010 data gap soil

investigation, which sampled and analyzed concrete and soil to determine the vertical and lateral

extent of PCB concentrations above the screening level. Thirty soil borings (E-SB-818 through

E-SB-847) were advanced in areas of Block E requiring additional delineation to determine the

horizontal and vertical extent of contamination. In addition to these borings, the detection of free

product at soil boring E-SB-833 led to additional delineation of the area through advancement of

14 additional soil borings (E-SB-833A through E-SB-833N), moving outward from the original

boring location (E-SB-833), to characterize soils in the subsurface.

All soil and concrete samples (241 plus 13 duplicates) were analyzed for PCBs. Twenty-one

samples were also analyzed for PAHs. Soil boring E-SB-828 was sampled (at nine and 11 feet

below grade) for TPH-DRO and -GRO. Boring E-SB-833 was sampled at nine feet below grade

for VOCs, SVOCs, inorganic metals, CrVI, and TPH-DRO and TPH-GRO. Soil and concrete

samples collected around E-SB-833 were analyzed for PCBs; soil samples were also analyzed

for VOCs and PAHs. Samples collected from six of these 14 borings were analyzed for

TPH-DRO and TPH-GRO, and one sample was analyzed only for TPH-GRO (E-SB-833B). A

water sample collected from the electric manhole adjacent to E-SB-833 was analyzed for VOCs,

PCBs, TPH-GRO, and TPH-DRO.

Evaluation of soil data for the data gap investigation indicates that PCB concentrations range

from non-detect to less than 1 mg/kg in most soil borings, with the following exceptions found in

E-SB-827, E-SB-833, and E-SB-835:

E-SB-827: maximum PCB concentration of 260 mg/kg detected at nine feet below grade

E-SB-833: free product observed at nine feet below grade during soil sampling.Analytical data indicate PCBs at seven to 11 feet below grade. The maximum PCBconcentration (24,000 mg/kg) was detected at nine feet below grade. PCB concentrationsreduced to 61 mg/kg at 11 feet below grade. Low PCB concentrations (below 1 mg/kg)were detected in the associated concrete samples.

E-SB-835: a PCB concentration of 3.5 mg/kg was detected at nine to 11 feet below grade


Trichlorobenzene (9,600,000 µg/kg), 1,2-dichlorobenzene (120,000 µg/kg), 14-DCB

(130,000 µg/kg) and TPH-DRO (28,000 mg/kg) were also detected in soil boring E-SB-833 at

9 feet below grade.

Data for the 14 additional soil borings around E-SB-833, covering an area with an approximate

60-foot radius, confirm the presence of PCBs. PCB concentrations range from non-detect to a

maximum of 2,000 mg/kg at soil boring E-SB-833A (10 feet below grade), which is

approximately 20 feet southwest of E-SB-833. These data indicate that the vertical extent is still

unknown at this location. The highest concentrations of PCBs in the additional soil borings in the

E-SB-833 area were as follows:

E-SB-833E (360 mg/kg at two feet below grade)

E-SB-833I (350 mg/kg at 10 feet below grade)

E-SB-833K (970 mg/kg at six feet below grade)

E-SB-833L (700 mg/kg at two feet below grade)

E-SB-833L (700 mg/kg at eight feet below grade)

Dichloro- and trichloro-benzenes were also detected in multiple soil samples in the E-SB-833

series soils (A though N). The concrete sample from E-SB-833F exhibited the highest PCB

concentration of 1,600 mg/kg. PCB concentrations exceeding the 1 mg/kg screening level are

shown in Figure 2-8.

2.3.10 Human Health Risk Assessment for Soil (Spring 2011)

An HHRA was completed in early 2011 for soil at Block E, as well as for other MRC tax blocks

(Tetra Tech, 2012a). This HHRA updated the risk evaluations in the May 2006 Site

Characterization Report (Tetra Tech, 2006) and is based on the significant volume of

environmental data collected from 2007–2010 to further characterize the nature and extent of

impacts to soil in Block E. The HHRA objective was to identify chemical contaminants of

concern (COC) that may pose risks to human health, and to determine if the detected chemical

concentrations in soil at Block E pose a significant threat to potential human receptors under

current and/or future land uses. No full-time workers currently work at Block E.


Potential risks to human receptors were estimated on the assumption that no actions will be taken

to control contaminant releases. Primary guidance sources used to prepare the risk assessment

include the MDE Cleanup Standards for Soil and Groundwater (MDE, 2008) and Voluntary

Cleanup Program Guidance (MDE, 2006). Current guidance and reports published by the United

States Environmental Protection Agency (USEPA) and USEPA Region 3 were also considered in

preparing the risk assessment.

The current and potential/hypothetical future land uses evaluated suggest the following potential

receptors could be exposed to impacted soils at the MRC:

construction workers

industrial workers

commercial land-use receptors

child, adolescent, and adult recreational users

future child, adolescent, and adult residents

Cancer and non-cancer risk estimates were calculated for these receptors using reasonable

maximum-exposure assumptions and assuming that human exposure to soils may occur via

incidental ingestion, dermal contact, and inhalation exposure routes. Cancer risk estimates were

presented in terms of incremental lifetime-cancer risks; the non-cancer risks were presented in

terms of hazard indices. Cancer estimates were interpreted using the MDE cancer risk

benchmark (1×10-5, or a one-in-100,000 probability of developing cancer) for cumulative risk,

and the USEPA target cancer risk range (1×10-4 to 1×10-6, or a one-in-10,000 to a

one-in-a-million probability of developing cancer); non-cancer risks were evaluated using a

hazard index (HI) value of 1.0 (adverse non-cancer health effects are not anticipated when the

estimated HI is equal to or less than 1). The following COC were identified for surface and

subsurface soils in Block E, based on a comparison of the cancer and non-cancer risk estimates

to the MDE risk benchmarks:


Taxblock

Acreage

Do risk estimates forhypothetical future full-time

workers exceed riskbenchmarks?

(Chemicals of concern(1))

Do risk estimates forhypothetical future residents

exceed risk benchmarks?(Chemicals of concern(1))

Block E 15.97 Yes:PCBs, BaPEq, 124-TCB, 123-TCB,14-DCB

Yes:PCBs, BaPEq, As(2), 124-TCB,CrVI(3), 14-DCB

(1) BaPEq (benzo[a]pyrene equivalents), arsenic (As), hexavalent chromium (CrVI), polychlorinatedbiphenyls (PCBs), 1,2,3-trichlorobenzene (123-TCB), 1,2,4-trichlorobenzene (124-TCB),1,4-dichlorobenzene (14-DCB)

(2) Arsenic concentrations likely represent background concentrations.

(3) The limited amount of available CrVI data for the tax block soils suggests that only low concentrations(typically less than 1 mg/kg) are present. Reported concentrations do not exceed the USEPA regionalscreening-level (RSL) for the industrial worker. Reported concentrations for most soil samples are alsoless than the USEPA RSL for the hypothetical future resident, if the USEPA RSL were to be set at the1×10-5 cancer risk level.

Preliminary cleanup goals were developed for those environmental media with incremental

lifetime-cancer risk (ILCRs) greater than 1×10-5 and a total HI greater than 1.0. Cleanup goals

were derived for those COC that contribute significantly to the cancer risk and/or hazard index,

for each exposure pathway in a given land-use scenario for a receptor group. Ranges of

preliminary cleanup goal concentrations developed for Block E COC in soil follow:

Aroclor-1254 (a PCB): 0.20 mg/kg (lifelong resident at 10-6 risk level) to 575 mg/kg(construction workers at 10-4 risk level)

Aroclor-1260 (a PCB): 0.202 mg/kg (lifelong resident at 10-6 risk level) to 575 mg/kg(construction workers at 10-4 risk level)

BaPEq: 0.014 mg/kg (lifelong resident at 10-6 risk level) to 53.8 mg/kg (adultrecreational user at 10-4 risk level)

1,2,4-trichlorobenzene: 18.2 mg/kg (lifelong resident at 10-6 risk level) to 18,360 mg/kg(adult recreational user at 10-4 risk level)

1,2,3-trichlorobenzene: 57.7 mg/kg (child resident at HI=1 risk level) to 306 mg/kg (adultresident HI=1 risk level)

1,4-dichlorobenzene: 3.1 mg/kg (lifelong resident at 10-6 risk level) to 307 mg/kg(lifelong resident at 10-4 risk level)

arsenic: 0.351 mg/kg (lifelong resident at 10-6 risk level) to 105 mg/kg (lifelongcommercial receptor at 10-4 risk level)


CrVI: 0.129 mg/kg (lifelong resident at 10-6 risk level) to 565 mg/kg (adolescent residentat HI=1 risk level)

Uncertainty in risk characterization resulted from assumptions made regarding additivity of

effects from exposure to multiple COC via various exposure routes. High uncertainty exists

when summing non-carcinogenic risks for several substances across different exposure

pathways. The assumption of additivity was considered because in most cases it represents a

conservative estimate of risk. The risk characterization does not consider antagonistic or

synergistic effects. Little or no information was available to determine the potential for

antagonism or synergism among the COPC. The likelihood of over- or under-predicting risks

could not be defined because chemical-specific interactions could not be predicted; however, the

methodology used is based on current USEPA guidance.

2.3.11 Additional Soil Investigation (July–August 2011)

The 2011 additional soil investigation sought to further characterize PCB in soils at the

southwest portion of Block E and provide data to complete a risk assessment for site worker

exposure. One-hundred-nine samples (80 during the first phase and 29 during the second phase)

were analyzed for PCBs. Figure 2-9 presents the composite PCB results for the surface and

subsurface soil investigations for 2011. Sampling locations and the results of this investigation

are included in the Additional Block E Soil Characterization Report (Tetra Tech, 2012b).

Overall, PCB concentrations greater than the screening level were detected in 39 of 106 samples

(37 samples and two duplicate samples). Aroclor-1254 and Aroclor-1260 are the only two PCBs

detected, with detected concentrations ranging from trace (0.0084 mg/kg) to a maximum of

19,000 mg/kg, in the eight- to 12-foot soil-sampling interval at soil boring E-SB-853, which is

within the area of a former transformer room. The highest concentration collected at a surface

soil location was 3,300 mg/kg at E-SB-852-01, which is adjacent to the former transformer room

and the former waste disposal area.

2.3.11.1 Initial Phase—July 2011

On-site screening was conducted using RaPID® Assay test kits. The test-kit results indicate

concentrations less than the screening criterion in at least one of the three deepest samples

collected from each boring. One exception is soil boring E-SB-853, where PCBs were detected


in the deepest sample at a test kit concentration of 1.6 mg/kg, which is slightly greater than the

screening threshold of 1 mg/kg. The deepest sample for this boring was analyzed for PCBs by

the laboratory, but a field decision was made not to continue sampling at this location because

the test-kit concentration was just slightly greater than the screening threshold. The laboratory

concentration of 1.5 mg/kg for E-SB-853-28-30 confirmed that the deep-sample PCB

concentration only slightly exceeded the screening criterion.

During the initial-phase sampling, 80 soil samples from 12 soil borings were analyzed for PCBs

by the laboratory. Laboratory results for the initial-phase soil samples indicate that PCB

concentrations exceeded the PCB screening criterion (1 mg/kg) in 20 soil samples. The

laboratory-detected PCB concentrations range from 0.0084 to 19,000 mg/kg (E-SB-853-8-12).

The mean PCB concentration of all samples collected during the July 2011 sampling event is

308 mg/kg.

Soil boring E-SB-853, the location of the highest PCB concentration, is approximately 30 feet

southwest of E-SB-833E and 20 feet south of E-SB-833F. The three highest concentrations of

PCBs detected in soil borings were as follows:

E-SB-852 (3,300 mg/kg at one foot below grade)

E-SB-853 (19,000 mg/kg at 12 feet below grade)

E-SB-853 (780 mg/kg at 16 feet below grade)

Evaluation of the July 2011 data led to the determination that the southern boundary of the

known PCB–impacted area needed further delineation, and that additional surface soil PCB data

were required to complete a risk assessment for worker exposure in this area.

2.3.11.2 Follow-on Phase—August 2011

Twenty-nine samples (23 soil, three concrete, and three duplicate samples) were collected from

15 locations and analyzed for PCBs during this investigation. PCBs were consistently detected in

all Block E surface soil samples, with 19 soil samples exceeding the PCB screening criterion of

1 mg/kg. The detected PCB concentrations range from 0.084 to 1,100 mg/kg (E-SB-864-0.0-0.5).

The mean of all samples collected in August 2011 is 152 mg/kg.


Soil boring E-SB-864 is approximately 60 feet east of E-SB-853 and 50 feet southeast of

E-SB-833K. The highest detected concentrations of PCBs in the follow-on phase of the

investigation (August 2011 samples) were as follows:

E-SB-862 (880 mg/kg at 0.5 feet below grade)

E-SB-864 (1,100 mg/kg at 0.5 feet below grade)

Three concrete samples were also collected. PCBs were detected in one of the three samples at a

concentration of 0.58 mg/kg (E-SB-874-CS).

2.3.12 Human Health Risk Assessment Update (Fall 2011)

An HHRA update was completed in 2011 for soil at several sub-areas of Block E (Tetra

Tech, 2012c). The HHRA was an update to the risk evaluations presented in the 2011 Human

Health Risk Assessment of Soils Blocks D, E, F, G, & H (Tetra Tech, 2012a). The HHRA update

is based on the environmental data in Tetra Tech (2012a) and additional Block E soil-chemical

data collected during the summer of 2011 (Tetra Tech, 2012b). The HHRA update was conducted

to determine if chemical concentrations detected in soil at three different areas in Block E pose a

significant threat to potential human receptors (i.e., industrial workers, lawn mowing personnel)

under the following current conditions:

current industrial workers at the Tilley Chemical Company who park trucks in thesouthwest area of Block E (referred to as the Tilley Chemical Company Area)

current volunteer workers that access the area used to store aircraft parts in the northeastarea of Block E (Museum Area)

current personnel that cut grass-covered portions of Block E (Grassy Area)

Potential risks to human receptors were estimated on the assumption that no actions will be taken

to control contaminant releases. Primary guidance sources used to prepare the HHRA include the

MDE Cleanup Standards for Soil and Groundwater (MDE, 2008) and Voluntary Cleanup

Program Guidance (MDE, 2006). Current guidance and reports published by USEPA and

USEPA Region 3 were also considered in preparing the risk assessment.

Current land uses suggest the following receptors could potentially be exposed to contaminated

soils at the MRC:


workers (specifically, Tilley Chemical Company employees parking trucks, museumworkers)

personnel that cut grass

Consequently, cancer and non-cancer risk estimates were calculated for these receptors using

reasonable maximum-exposure assumptions, and assuming that human exposure may occur via

incidental ingestion, dermal contact, and inhalation exposure-routes.

Cancer-risk estimates are presented in terms of incremental lifetime-cancer-risks;

non-cancer-risk estimates are presented in terms of hazard indices. Potential cancer effects were

interpreted using the MDE cancer risk benchmark (1×10-5, or a one-in-100,000 probability of

developing cancer) for cumulative risk, and the USEPA’s target cancer risk range (1×10-4 to

1×10-6). Non-cancer risks were evaluated using an HI value of 1.0 (adverse non-cancer health

effects are not anticipated when the estimated HI is equal to or less than 1). The following COC

were identified for surface soils in each of the Block E sub-areas, based on a comparison of the

cancer and non-cancer risk estimates to the MDE risk benchmarks:

Exposure unit Receptor Chemical of concern

Museum area—all locations Typical industrial worker None

Museum area—exposed locations Typical industrial worker None

Tilley Chemical Company area—all locations

Typical industrial worker Aroclor-1260

Typical industrial worker,fraction ingested = 0.5

Aroclor-1260

Tilley Chemical Company areachemical-exposed locations

Typical industrial worker Aroclor-1260

Typical industrial worker,fraction ingested = 0.5

Aroclor-1260

Grassy area Mowing personnel BaPEq, Aroclor-1254, Aroclor-1260

*The non-cancer toxicity criteria for Aroclor-1254 were used as a proxy for Aroclor-1260.

BaPEq = benzo(a)pyrene equivalents

Following this additional analysis, ILCRs calculated for a typical industrial worker

hypothetically working within the Tilley Chemical Company Area (3×10-6 to 5×10-5) do not


exceed the USEPA target risk range (1×10-4 to 1×10-6); risk estimates calculated based on the

most likely exposures incurred by current Tilley Chemical Company Area workers (3×10-6 to

5×10-6) also do not exceed the MDE target cancer risk level (1×10-5). HI for these workers do not

exceed 1. The incremental lifetime cancer risk for the lawn mower (2×10-5) does not exceed the

USEPA target cancer risk range, but does exceed the MDE target risk level. The HI for the lawn

mower does not exceed 1.

The HHRA update includes the following cleanup goals for the lawn mower operator:

Aroclor-1254 (a PCB): 19.3 mg/kg (10-6 risk level) to 1930 mg/kg (10-4 risk level)

Aroclor-1260 (a PCB): 19.3 mg/kg (10-6 risk level) to 1930 mg/kg (10-4 risk level)

BaPEq: 5.6 mg/kg (10-6 risk level) to 555 mg/kg (10-4 risk level)

Cleanup goals were previously calculated for other typical Block E industrial workers in the

HHRA for Tax Blocks D, E, F, G, and H (Tetra Tech, 2012a).

2.3.13 Utility Cross-Connection Study (Summer 2011)

A utility cross-connection (UCC) investigation (Tetra Tech, 2012d) was completed in 2011 for

the area in Block E identified for potential in situ groundwater bioremediation in the draft

Groundwater Response Action Plan (Tetra Tech, 2012e). The UCC investigation included only

the southeastern portion of Block E, in the area around the existing 500,000-gallon water tank

and REC #3. The objective of this program was to identify utilities within the footprint of the

groundwater remedy system currently proposed for installation in 2013. The results of the utility

cross-connection investigation were used to design a pilot-scale groundwater-injection tracer test

and the full-scale groundwater remedial system design.

The UCC investigation included reviews of historical drawings, employee interviews, site

reconnaissance, geophysical surveys, field and closed-circuit television (CCTV) inspections of

storm drains, and professional land surveying to locate, record, and map subsurface utilities that

may act as preferential migration pathways for groundwater contaminants or bioremediation

substrates that may be injected into groundwater to remedy VOCs. Historical and current utility

records, site reconnaissance, and geophysical surveys indicate numerous underground utilities in

the Block E study area. In interviews, current MRC employees did not recall any utilities that


were not marked on the current MRC utility drawing. Underground utilities include electrical

lines, telecommunication lines, domestic and fire water lines, and storm drains. Known utilities

and geophysical anomalies were marked in the field. These locations were professionally

surveyed to provide location coordinates and elevations, and to provide detailed maps of the

utilities for future remedial designs. Closed-circuit television was used to inspect and digitally

record accessible underground structures.

Underground utilities described in historical documents for the Block E study area include a

storm drain line, a former #2 fuel pipeline (two-inch diameter) that ran along the Block E fence

line, a 10-inch-diameter fire water line (now abandoned) running along the southern perimeter of

former Building D, and two fire water lines that connected the existing AST to a former fire

pump in the southeastern corner of the former Building D basement. Several drains are in the

basement floor of former Building D; these are shown in historical documents as connecting to

the storm drain system south of the former Building D foundation.

An unknown linear geophysical anomaly was detected along the median of Chesapeake Park

Plaza. The anomaly runs from the western edge of the survey area, crosses underneath the

roadway, and terminates at a concrete block in the southeastern corner of Block E. An additional

geophysical anomaly was detected in the area of a former aboveground fuel storage tank west of

the current aboveground water tank. Block E study area storm-drain systems consist of groups of

steel-grated brick catch basins, manholes, and concrete underground piping that discharge to

Dark Head Cove via Outfalls 06 and Outfall 08.

Several sections of large pipe were characterized as having root intrusion, and several contain

small longitudinal cracks near joints. Medium pipe offsets were observed in a line connecting a

catch basin to a manhole. Groundwater seepage was observed in the pipe upstream of a catch

basin north of the water tank.

Storm drain lines exist in the proposed injection area of Block E, but they are shallow, with

typical structure depths slightly less than three feet to nearly five feet below grade (maximum

depth of 4.7 feet below grade). The deepest catch basins, located in the Chesapeake Park median

east of Block E, are approximately 7.6 feet deep. Historical groundwater level data in the


Block E study area indicate that groundwater levels fluctuate seasonally and respond to droughts

and moderate to heavy precipitation events.

Groundwater depths range from approximately one foot to slightly over eight feet below grade in

the central and southern portions of Block E, and 10–15 feet below grade in the northern portion

of Block E. Groundwater depths in the central and southern portions of the site, and the presence

of cracks and joint separations, suggest that storm drains in the Block E study area could

potentially intercept the upper surface of the groundwater table. As part of the Block E

inspections, groundwater was observed flowing into a joint separation north of the water tank.

Groundwater inflow encrustations were observed in the deepest pipes running in the median of

Chesapeake Park Plaza.

2.3.14 Block E Storm-Drain Interim Remedial Measures (Fall 2011)

A storm-drain interim-response measure (IRM) was completed at Block E in autumn 2011 (Tetra

Tech, 2012f). The IRM removed sediment and debris from the drainage system piping and

manholes, provided sediment controls, and repaired or replaced inlets and manholes. The IRM

was intended to minimize the transport of contaminated storm-drain sediments to off-site

locations and to allow free drainage of the Block E area. The IRM was not designed to achieve

preliminary sediment cleanup goals, but rather to remove the more mobile sediment that could

migrate off-site from the drainage system. The IRM was an initial step in the more

comprehensive remediation of contaminated sediments planned for the Dark Head Cove area.

Any inlets, manholes, or pipe sections of the storm drain system that were damaged beyond

repair or blocked and inaccessible were generally left as found. A Maryland-licensed land

surveyor conducted a pre-construction survey to record topographic and as-built features of the

planned and potential areas of disturbance around the Block E storm drain system. Following

completion of all fieldwork, a post-construction survey documented that the site had been

restored to a condition as close as practical to its original pre-construction state.

Three additional catch basins were identified in the northeast corner of Block E during a site

walk-through in July 2011, before implementation of the Block E storm drain system IRM. Two

buried manholes (MH-8 and MH-9) were also found near the southeast corner of the former

Building D foundation during the IRM. These manholes have grated-steel covers and previously


acted as catch basins for local runoff. Manhole MH-9 was raised to grade and a new cover placed

over the manhole opening. Manhole MH-9 is filled with rocks, which partially obstruct flow

from the upstream pipe. However, large rocks used for backfill allow some water to flow through

manhole MH-9 to the downstream catch basin and piping. MH-8 could not be cleaned or filmed

because the piping was filled with water due to the rocks obstructing the connection from MH-9.

Cleaning the storm sewer system involved inserting a jet nozzle into the downstream structure

and propelling it toward the upstream structure. As the nozzle was pulled back, liquid and solid

material was vacuumed into a jet-vacuum truck. Hand removal of debris was necessary at some

locations due to the large size or heavy weight of the debris in these structures.

If lines were damaged or filled with material such that cleaning was not possible, those segments

were left as found and cleaning proceeded to the next line segment or outfall system. Jet-vacuum

truck contents were transferred to roll offs or fractionation tanks located on a containment pad.

The storm drain lines were cleaned to restore a minimum of 95% of their original flow capacity.

Concrete debris affixed to the storm drain pipes could not be removed with the industry standard

conventional cleaning equipment employed. Concrete affixed to pipes was mainly observed on

an east–west line of the Outfall 06 storm drain system.

After a pipe segment had been cleaned, the mobile CCTV truck was positioned at the upstream

structure and a robotic crawler camera equipped with a multi-angle lens was inserted into the

drainage pipe to video inspect the downstream structure. All observations were recorded on a

hard drive, and an audio commentary accompanied the video inspection.

Repairs using brick, concrete, grout, and cast iron frames and covers were performed as cleaning

of the Block E storm drain system progressed. Crushed stone backfill and concrete or vegetative

surface finishes were used as needed to return the structure/location to its original or better

condition. Upon completion of the IRM, all disturbed areas were restored to approximately

pre-existing grades. Seed and topsoil were distributed across all disturbed vegetated areas. Land

surveys, photographs, and a post-cleaning video survey of the Block E drainage pipes document

site restoration activities. Sediment controls, including silt fences and hay bales, were then

installed around catch basins and manholes to minimize sediment reentering cleaned drain lines.


2.3.15 Pilot Injection Program (Fall 2011)

An injection pilot test was performed in November 2011 in the southeastern portion of Block E

in the area of the 500,000-gallon water tank to determine key design parameters for a full-scale

bioremediation system for the eastern TCE plume (Tetra Tech, 2012g). The test layout consisted

of an injection well screened at a depth interval of 15–35 feet and three monitoring well clusters

approximately five feet, 10 feet, and 15 feet from the injection well. Each monitoring well cluster

consisted of two monitoring points: a deep interval (25–35 feet) and a shallow interval

(10–20 feet).

Three separate 24-hour injection tests were performed at Block E: (1) a low-rate test

(approximately 0.3 gallon per minute); (2) an intermediate-rate test (approximately 0.5 gallon per

minute); and (3) a high-rate test (approximately one gallon per minute). Each test was performed

by injecting an aqueous sodium-bromide tracer solution into the injection well and monitoring

injection effects in nearby monitoring well clusters and from nearby storm drain catch basins.

Changes in hydraulic head and bromide tracer detections were used to evaluate the injections’

radii of influence.

During the high-rate test, the water level in the injection well was only approximately five feet

above the static level (approximately three feet below ground surface). The bromide tracer was

detected in all Block E deeper monitoring wells monitored for the test. In contrast, no bromide

tracer was detected in any shallow Block E well monitored for the test. This confirms that the

deeper interval in Block E is more permeable as compared to the shallow portion of the

formation, and that a degree of hydraulic isolation occurs between the shallow and deeper zones.

Following the high-rate injection test, an elevated bromide concentration (1.7 mg/L versus

0.1 mg/L baseline) was detected in the Block E catch basin MH-10/IL-3, north and hydraulically

upgradient of the test area. For design purposes, we have assumed that bromide traveled from the

injection well to catch basin MH-10/IL-3, perhaps via a preferential pathway. Detection of

bromide in the storm sewer system during the pilot test demands that particular care be taken in

the design and implementation of the full-scale bioremediation system to be installed in Block E.


2.3.16 Blocks E and G Pre-Design Soil Sampling Investigation(Summer 2012)

A soil investigation (Tetra Tech, 2012h) was conducted in June 2012 to support the design of the

Block E groundwater treatment system. The pre-design soil sampling program consisted of

collecting and chemically analyzing soil samples from the ground surface to 10 feet below grade

at 25 locations in and around the footprint of the planned groundwater remediation system at

Block E. The locations of the pre-design soil borings are shown in Figure 2-10. The purpose of

this investigation of the Block E area was to refine the limits of impacted soil at the planned

treatment area and to determine cut lines for excavation and proper disposal of any soils

removed. Samples were analyzed for PCBs, PAHs, and TPH-DRO/GRO. Ten samples were

analyzed for CrVI, metals, and pesticides.

The pre-design investigation delineated PCBs in soils at the planned Block E groundwater

treatment system area. The maximum pre-design sample PCB concentration in Block E was

320 mg/kg, detected in boring E-SB-890 at a depth of zero to two feet below grade

(Figure 2-10). PCB concentrations decreased to 3 mg/kg at a depth of 2–4 feet in the same boring.

Boring E-SB-890 was advanced in the location of a former 500,000-gallon diesel fuel tank. Most

of the PCB concentrations detected above the remediation goal of 1 mg/kg are limited to the top

two feet of soil in and around the 500,000-gallon water tank in the southwest corner of Block E.

BaPEq concentrations in the pre-design soil samples range from less than 3.5 µg/kg to a

maximum of 2,104 µg/kg in sample E-SB-897-0–2. The residential screening level of 140 µg/kg

was exceeded in seven samples. Most of the BaPEq exceedances were in the grass covered area

surrounding the water tank, and were collected in the 0–2 foot interval. An exception is sample

E-SB-906-6–10, which was collected north of the water tank at a depth of six to 10 feet below

grade.

TPH-DRO was detected in eight samples (plus one duplicate) from three soil borings (E-SB-890,

E-SB-905 and E-SB-906), and at various depths. Several samples had concentrations in excess of

the residential screening level of 230 mg/kg. The highest concentrations of TPH-DRO in the

pre-design samples (15,000 and 4,800 mg/kg) were observed beneath the basement floor of

former Building D (samples E-SB-905-6–10 and E-SB-906-6–10), at a depth of six to 10 feet

below grade.


CrVI and pesticide concentrations in Block E soil samples were below their respective

residential screening levels in the 10 samples analyzed. Metals such as arsenic and vanadium

were detected in soils collected from 10 sampling locations. However, none of these metals

exceeded their residential screening levels.

Table 2-1

Chronological Summary of Block E Events and Investigations

Lockheed Martin Middle River Complex, Middle River, Maryland

Page 1 of 5

Investigation Report Fieldwork DateGeophysical Survey/Utility

Survey/Radiological SurveySoil Borings Well Installation Water Sampling

Sediment

SamplingComments/Results

Phase I Environmental

Investigation


Investigation Report

(H2M Associates, Inc.

[H2M], 1998)

1997-1998 None None None None None Conducted by H2M on seven parcels within the Middle River Complex (MRC) including the Former Building D Lot within Block E. Based on

observations made during a site visit and information obtained from the regulatory database review and site history review, 3 areas of potential

concern (APC) were identified in the Former Building D Lot including a Fuel Oil Transfer House (APC #3) with surface staining and minor spillage

with absorbent materials on the floor, Trailer Restoration Company (APC #4) whose activities could not be confirmed, and a Spherical Structure

(APC #5) appearing to be an elevated tank was visible in the 1982 and 1989 aerial photographs and whose use could not be confirmed.

Phase I Environmental Site

Assessment (ESA)


Site Assessment

(Earth Tech, 2003)

2002 None None None None None Conducted by Earth Tech in 2003 consisted of a historical review of the MRC (i.e., a review of available facility documents, aerial photographs, and

city directories), a review of Federal, state, and local agency databases, interviews with site personnel, and a site visit. The Phase I ESA identified 13

recognized environmental conditions (RECs) associated with the MRC including REC #1 (Former Building D), REC #2 (Product Pipeline), and REC

#3 (Former 500,000-gallon Above Ground Storage Tank [AST] and associated tanks) located in Block E.

Radiological Survey of

Former Building D

Radioloical Survey

Reportfor Former

Building D (Tetra Tech,

2004b)

April 2004 A radiological survey was performed in Block E at

two locations in the southwestern portion of

former Builing D. Two locations were surveyed

including the primary area along the southern

boundary of the building, and the secondary area

along the western boundary and southwest corner

of the building.

None None None None The radiological surveys revealed three areas with gamma readings elevated above background. These three areas did not appear to be associated

with a particular source or activity. Naturally occurring radiation common to building material such as brick and tiles could account for the elevated

readings in the second area. Elevated readings in the two grassy areas might also be attributable to naturally occuring radiation, however, this was not

indicated by background readings taken at a location of similar soil type. None of the elevated levels appear likely to have presented an exposure risk

for a full-time worker.

Only gamma exposure rates were obtained from the secondary area of concern due to standing water at the time of the survey. No gamma

measurements above background were observed.Ten radionuclides were detected above the MDE, with the results appearing to be

consistent with background levels and naturally occurring radioactive material. Samples

SB-41S-SS, SB-42S-SS, SB-43C-SS, and SB-43T-SS had detects above the minimum detectable

concentrations on lead and bismuth as well as radium. All three radionuclides are expected on the

radium and uranium decay changes, both of which can occur naturally.

Detected concentrations of Aroclor-1260 (polychlorinated biphenyl [PCB])exceeded the MDE residential standard of 320 µg/kg in two samples (SB-

3A-SS, 350 µg/kg and SB-4A-SS at 180,000 µg/kg (re-analysis 200,000 µg/kg). It was not detected in any subsurface samples. DRO was detected at

concentrations ranging from 13,000 ug/kg (SB-36) to 330,000 ug/kg (SB-4A in the subsurface soil). DRO was detected once in the subsurface soil

samples at 56,000 ug/kg (SB-19-5). The maximum DRO concentration of 330,000 µg/kg was the only subsurface detection exceeding the MDE soil

cleanup standard.

SB-1A-GW exceeded MDE groundwater standards for beryllium (11 µg/L) and nickel (170 µg/L). SB-3A-GW exceeded MDE groundwater

standards for GRO (140 µg/L), nickel (140 µg/L) and zinc (1,200 µg/L). SB-38-GW exceeded MDE groundwater standards for 1,1-DCE (21 µg/L),

Cis-1,2-DCE (320 µg/L), MTBE (99 µg/L), TCE (1,900 µg/L), vinyl chloride (49 µg/L), GRO (970 µg/L), and nickel (240 µg/L). SB-45 exceeded

MDE groundwater standards for GRO (150 µg/L). SB-49 exceeded MDE groundwater standards for benzene (18 µg/L) and DRO (600 µg/L).

Phase II Investigation

6 radiological surface media samples were

collected from the three gamma anomalies (SB-41

through SB-43) identified during the radiological

survey and submitted for gamma-spectroscopy

analysis.

March 2004Site Wide Phase II

Investigation

(Tetra Tech, 2004)

Site Wide Phase II

Investigation

Fall/ Winter 2003Final Report Phase II

Investigation of Exterior

Areas, Volumes I and II

(Tetra Tech, 2004a)

None3 groundwater samples (SB-2, -4,

and -6) were collected from REC

#1 and analyzed for TPH-GRO

and -DRO, VOCs, SVOCs, total

and dissolved metals, and PCBs.

13 groundwater samples (SB-9

through SB-21) were collected

from RECs #2 and #3 and

analyzed for TPH-DRO and

BTEX+naphthalene.

None6 soil borings (SB-1 through SB-6) REC #1, two soil samples

collected from each location were analyzed for total petroleum

hydrocarbons (TPH)-gasoline range organics (GRO) and -

diesel range organic (DRO), volatile organic compounds

(VOCs), semivolatile organic compounds (SVOCs), metals,

and polychlorinated biphenyls (PCBs).

10 soil borings (SB-9 through SB-18) REC #2, one soil sample

collected from each location were analyzed for TPH-DRO and

benzene, toluene, ethylbenzene, and xylenes

(BTEX)+naphthalene.

3 soil borings (SB-19 through SB-21) REC #3, two soil

samples collected from each location were analyzed for TPH-

DRO and BTEX+naphthalene.

A radiological survey was performed at two

locations in Block E. The primary location was in

the southwestern portion of Building D, and the

secondary area was immediately north of the

primary location.

The radiological surveys revealed three areas with gamma readings elevated above background. Two of these three areas did not appear to be

associated with a particular source or activity. Elevated readings in the third area may be the result of naturally occurring radiation common to

building material, such as brick tiles. None of the elevated levels appear likely to have presented an exposure risk for a full-time worker.

All soil borings were advanced using direct push technology (DPT). VOCs, polyaromatic hydrocarbons (PAHs), TPH‑GRO, and various metals were

detected in soil samples. Arsenic and benzene are the only compounds detected at concentrations exceeding Maryland Department of the

Environment (MDE) screening levels. Arsenic exceedances were detected above the MDE cleanup standard of 3,800 micrograms per kilogram

(µg/kg) at concentrations of 5,500 and 4,900 µg/kg from SB-1-5 and SB-4-5 soil samples, respectively. Benzene was detected in soil sample SB-21-

10 slightly above the 5 µg/kg MDE cleanup standard with a concentration of 6 µg/kg.

SB-2 exceeded MDE groundwater standards for GRO (420 micrograms per liter [µg/L]), methyl tert-butyl ether (MTBE) (230 µg/L), trichloroethene

(TCE) (13 µg/L), and vinyl chloride (7 µg/L). SB-4 exceeded MDE groundwater standards for beryllium (23 µg/L), chlorobenzene (51 µg/L), GRO

(110 µg/L), and nickel (560 µg/L). Benzene was detected in groundwater from SB-9 at 21 µg/L and SB-21 at 10 µg/L. TPH-DRO was detected in

groundwater samples collected from SB-19 at 3,000 µg/L.

None7 groundwater samples were

collected (SB-1A, -3A, -35, -36,

and SB-38 through SB-40) REC

#1 and were analyzed for TPH-

GRO and -DRO, VOCs,

perchlorate, SVOCs, total and

dissolved metals, and PCBs.

3 groundwater samples were

collected (SB-44 through SB-46)

REC #2 and were analyzed for

TPH-GRO, VOCs, and

perchlorate.

3 groundwater samples were

collected (SB-47 through SB-49)

REC #3 and were analyzed for

TPH-DRO and

BTEX+naphthalene.

None8 surface soil samples (SB1A through SB-61, SB-35, and SB-

36) REC #1 and were analyzed for TPH-GRO and -DRO,

VOCs, SVOCs, metals, and PCBs.

Table 2-1



Page 2 of 5



Sediment


Historical Survey Historical Survey

(Tetra Tech, 2004c)

Summer 2004 None None None None None A historical research investigation was conducted to evaluate historical site activities identified in the Phase I. Based on the investigation findings, a

total of 18 additional RECs located along the facility’s perimeter, within the active industrial yard, and within Buildings A, B, and C were identified,

thus bringing the total to 31 RECs.

Phase II Soil Investigation Site Characterization

Report

(Tetra Tech, 2006)

Summer 2005 None 1 soil sample was collected from SB-4A

2 samples were collected SB-232 through SB-235

None None None To further delineate previously detected elevated levels of PCBs, two samples (from 0–1 feet and 1–2 feet bgs) were collected from four soil borings

located approximately 60 feet from SB-4A. Samples were analyzed for PCBs, and found to include the common PCBs Aroclor‑1242 and

Aroclor‑1260. The average concentration of Aroclor-1242 in the soil samples was 45 µg/kg. The maximum concentration of Aroclor-1242 was 58

µg/kg (SB-235) and the minimum concentration was 32 µg/kg. The average concentration of Aroclor-1260 in the soil samples was 250 µg/kg. The

maximum concentration in these samples was 1,070 µg/kg (SB-234) and the minimum concentration was 8.5 µg/kg.

Site Characterization Report Site Characterization

Report

(Tetra Tech, March 2006)

None None None None None Summarizes the data collected for all environmental media through 2005, including screening of the chemicals detected in soil against natural

background concentrations. It also includes a human health risk assessment (HHRA) that identifies potential human health effects posed by exposure

to the detected levels of site chemicals under a number of current and hypothetical land use scenarios. After comparison to natural background

concentrations and the HHRA, arsenic (identified as a chemical of potential concern (COPC) in Block E and E Lot 3 soil) was not retained as a

chemical of concern (COC). Polycyclic Aromatic Hydrocarbons [PAHs] (expressed as benzo[a]pyrene equivalents [BaPEq]), PCBs, and TPH‑DRO

and ‑GRO in surface and subsurface soils were identified as COC for Block E.

Additional Field

Investigation

Block E Data Summary

Report (Tetra Tech,

2011a)

Fall 2007 None 20 surface soil samples were collected around SB-4A and

analyzed for PCBs. 21 soil borings were then advanced across

the Building D footprint. Three samples were collected from

each boring and analyzed for PCBs, VOCs, SVOCs, and

metals. Lastly, four surface soil samples were obtained from

around each of the five storm sewer manholes located south of

former building D. These 20 samples were analyzed for PCBs.

None None 101 soil samples were collected and analyzed during this event. The sixty samples collected from soil borings were analyzed for PCBs, VOCs,

SVOCs, metals, iron and manganese, mercury, and TPH-GRO/DRO. The forty-one surface soil samples (not collected from soil borings) were only

analyzed for PCBs.

PCBs (more specifically, Arclor-1260, the only PCB detected) was detected at 52 sampling locations with concentrations in soil ranging from non

detect to a maximum of 1,800,000 µg/kg. Elevated PCB concentrations in soil samples were typically collected between the concrete floor slabs in

the area of former Building D. PAHs exceeded the screening level of 150 µg/kg at 20 sampling locations. BaPEq concentrations exceed the screening

level of 150 µg/kg at four of the 14 locations analyzed for PAHs.

Phase I Historical Review February 2008 February 2008 None None None None None This historical Data Review included evaluation of previously unknown facility records, museum files, interviews, Freedom of Information Act data,

and review of available aerial and low angle oblique photographs.

Supplemental Soil and Storm-

Drain Sediment

Characterization

Supplemental Soil and

Storm-Drain Sediment

Characterization Report

(Tetra Tech, 2010)

Fall 2008 - Jan 2009 None 161 soil samples (including duplicates) were collected from 49

DPT advanced soil borings in Block E.

None None None The study focused on defining the extent of PCB impacts in Tax Block E and E Lot 3 soil and associated storm-sewer sediment, based on previous

investigations. The soil borings were located in areas where the horizontal extent of PCB impacts was not completely bounded and the vertical extent

of PCB impacts below the shallow sampling depth (i.e., 1–2 feet below ground surface [bgs]) was unknown.

The chemical analytical results confirmed the presence of PCBs (including Aroclor-1016, -1254, and -1260) in 58 soil samples. Aroclor 1260

concentrations range from non-detect to a maximum of 300,000 µg/kg (SB-569-0-0.5). Aroclor 1260 was detected in surface soil samples from

across the Building D site. Fifteen soil samples exceeded the screening level at that time. PCB concentrations for several deeper-depth samples,

including SB-555A 12 (710 µg/kg), SB-555A 14 (38 µg/kg), and SB 570A-10 (34 µg/kg), did not exceed the screening level.

Of the 23 sediment samples, PCBs exceeded greater then 1000 ug/kg in 13 sediment samples. Max PCB concentrations of 102,000 ug/kg was

detected in ILSD-18. BaPEq was detected in all sediment samples, but exceeded in 4 sediments greater than screening level. The maximum BaPEq

was detected in IL-15 with 139,052 ug/kg. There were low detection of TCE in sediments. Cadmium and Chromium concentrations exceeded

screening criteria.

Table 2-1



Page 3 of 5



Sediment


To delineate the areas of concern in Block E, this DPT soil characterization was executed to define the lateral and vertical (as defined by

groundwater) boundaries of COCs as defined in the Site Characterization Report. Soil boring E-SB-833 at 9 feet bgs contains VOCs, semivolatile

organic compounds (SVOCs), PCBs, inorganics, and TPH-DRO and -GRO. Exceedances include PCBs, arsenic, iron, and TPH-DRO. These

extremely high concentrations led to advancement of 14 additional soil borings, E-SB-833A through E-SB-833N in this area.

Evaluation of the data collected in 2010 verifies the presence of PAHs, PCBs, and TPH-DRO and -GRO in the soils in 36 of the 44 soil borings,

including the 14 soil borings associated with E-SB-833. BaPEq concentrations exceed the screening level of 150 micrograms per kilogram at four of

the 14 locations analyzed for PAHs. PCBs concentrations typically ranged from non-detect to less than 1,000 micrograms per kilogram with six

exceptions ranging from 3,500 to 24,000,000 micrograms per kilogram at the initial boring locations in subsurface soils.

The additional 14 soil borings around E-SB-833 confirmed areas of PCB impacts with sample results ranging from non detectable to a maximum of

2,000,000 µg/kg (E SB 833A-10). Although most of the concrete samples had low PCB concentrations (below 1,000 µg/kg), one concrete sample

(from E-SB-833F) detected maximum PCBs 1,600,000 µg/kg. Dichloro and trichloro benzenes were also detected in multiple soil samples in the E-

SB-833 series soils (A through N). PAHs (reported in terms of BaPEq) exceeded the screening level of 150 µg/kg in seven of the 59 E-SB-833 series

soils analyzed, distributed among four of the 14 soil borings. BaPEq concentrations range from non detectable to 1,788 µg/kg (at E-SB-833K-02).

TPH-DRO exceeded screening levels in soil boring E-SB-828 at 9 feet bgs, E-SB-833 at 9 feet bgs, in the electric manhole water sample (adjacent to

E-SB-833), and between 2 and 10 feet bgs at several of the E-SB-833 series borings (E-SB-833A, E-SB-833BE, E-SB-833I, E-SB-833K, and E-SB-

833L). Results by the manhole also indicate TPH-GRO.

Human Health Risk

Assessment for Block D, E,

F, G, and H Soils

Tetra Tech, (2012a) An HHRA was completed in early 2011 for soil at Block E as well as other tax blocks at the MRC. This HHRA was an update to the risk

evaluations in the May 2006 Site Characterization Report (Tetra Tech, 2006b).The objective of the HHRA was to identify chemical contaminants

of concern (CoC) that may pose risks to human health, and to determine if the detected chemical concentrations in soil at Block E pose a significant

threat to potential human receptors under current and/or future land uses.

Cancer and non cancer risk estimates were calculated for construction workers, industrial workers, commercial land-use receptors, and current and

future child, adolescent, and adult recreational user receptors using reasonable maximum exposure assumptions and assuming that human exposure

may occur via incidental ingestion, dermal contact, and inhalation exposure routes.

Polychlorinated biphenyls (PCBs), benzo(a)pyrene equivalents (BaPEq, 1,2,3,-trichlorobenzene (123-TCB), 1,2,4,-trichlorobenzene (124-TCB),

and 1,4-dichlorobenzene (1,4-DCB) had risk estimated exceeding risk benchmarks for hypothetical future full-time workers.

Polychlorinated biphenyls (PCBs), benzo(a)pyrene equivalents (BaPEq), 1,2,4,-trichlorobenzene (124-TCB), hexavalent chromium (CrVI), and 1,4-

dichlorobenzene (1,4-DCB) had risk estimated exceeding risk benchmarks for hypothetical future residents.

Additional Block E

Characterization

Tetra Tech (2012b) July and August 2011 None Initial phase: July 2011- 93 soil samples were collected from

12 soil borings in Block E in four foot increments to 30 feet

bgs.

Follow-on Phase: August 2011- Follow-up sampling included 2

surface soil samples collected from each of 13 locations (at one

location only one sample was collected) to two feet bgs along

with 3 concrete samples to 0.1 feet bgs. All samples were

analyzed for PCBs. Thus a total of 25 surface soils and 3

concrete samples were collected.

None None None Of the soil samples collected from borings advanced to 32 feet, 22 samples exceeded the MDE residential screening criteria, 18 of which also exceed

the non-residential screening criteria. Additional samples were collected from borings advanced to two feet bgs to further define the extent of PCB

impacts. 22 of the 26 soil samples collected from borings advanced to 2 feet exceeded the MDE residential screening criteria, 19 of which also

exceed the non-residential screening criteria. Only one of the concrete samples exceeded the MDE residential screening criteria.

Based on analysis of July 2011 preliminary data, the average concentration for soil samples with detectable levels of PCBs in the soil borings

advanced to 32 feet was 719,566 µg/kg. The maximum concentration in these samples was 19,000,000 µg/kg (E-SB-853-12) and the minimum

concentration was 1.3 µg/kg (E-SB-850-04).

The follow-up sampling in August 2011 was focused on surface soils and 3 concrete samples. The average concentration for surface soil samples

with detectable levels of PCBs in the soil borings advanced to two feet was 163,390 µg/kg. The maximum concentration in these samples was

1,100,000 µg/kg (E-SB-864-SB-0.0-0.5) and the minimum concentration was 1.3 µg/kg (E-SB-866-SB-0.5-2.0).

Validated data collected during the following environmental investigations were used to assess risks to potential human receptors:

• Phase II site investigation (fall/winter 2003)

• Site wide Phase II investigation (2004)

• Phase II soil investigation (summer 2005)

• Additional soil characterization (fall 2007)

• Supplemental soil and storm-drain-sediment characterization (Block E fall 2008)

• Final soil delineation (Blocks D, F, G, and H fall 2009)

• Data gap investigation (fall 2010)

2010 Data Gap Investigation Block E Data Summary

Report (Tetra Tech,

2011a)

Summer and Fall 2010 None Eight samples were collected in two-foot intervals at each of 30

soil borings. Concrete samples were collected from 14 of these

30 boring locations. Soil and concrete samples were analyzed

for PCBs with 21 soil samples also being analyzed for PAHs.

Additional concrete samples and soil samples at two-foot

increments were collected from each of 14 borings advanced

around E-SB-833. The soil and concrete samples were

analyzed for PCBs. All soil samples were also analyzed for

VOCs, and PAHs. In addition, soil samples from six of the 14

locations were also analyzed for TPH-GRO/DRO (one only

analyzed for TPH-GRO).

None One water sample was collected

from the electric manhole adjacent

to E-SB-833 and analyzed for

VOCs, PCBs, and TPH-

GRO/DRO

None

Table 2-1



Page 4 of 5



Sediment


Human Health Risk

Assessment Update for

Block E Soils

Tetra Tech (2011c) Cleanup goals were developed for those environmental media with incremental lifetime cancer risk (ILCRs) greater than 1×10 5 and a total hazard

index (HI) greater than 1.0. Cleanup goals were derived for those contaminants of concern (COC) that contribute significantly to the cancer risk

and/or hazard index for each exposure pathway in a given land use scenario for a receptor group. Cleanup goals were calculated for Industrial

workers in the Tilley Chemical Company Area and lawn mower operators as those for Block E industrial workers had already been calculated in the

HHRA for Tax Blocks D, E, F, G, and H.

Industrial workers in the Tilley Chemical Company Area had ILCRs exceeding USEPA’s target-risk range for some scenarios and MDE’s target level

for all scenarios except when the inhalation only exposure route was evaluated. HIs for industrial workers in the Tilley Chemical Company area

exceed 1 in most scenarios; however, HIs for Scenarios 5 and 6 and for the inhalation only evaluation do not exceed 1. The inhalation exposure route

is the most likely exposure route for current receptors, and worker exposure via ingestion and dermal contact is currently highly unlikely.

ILCRs for the lawn mower operator do not exceed USEPA’s target risk range. The lawn mower operator ILCR for the reasonable maximum exposure

(RME) exceeds MDE’s target level, but the ILCR for the central tendency exposure (CTE) is less than MDE’s target level. The HI for the lawn

mower operator exceeds the target level of 1 for the RME but is less than 1 for the CTE. Given the very limited potential for lawn mower operator

contact with surface soils, the CTE scenario is most likely (versus the RME scenario) reflective of current exposures incurred by the receptor.

Utility Cross-Connection

Investigation Report

Tetra Tech (2012d) Summer 2011 Geophysical surveys consisting of a pipe- and

cable-locator survey and mark‑out, and an

electromagnetic (EM) survey survey were

performed in June 2011 to locate and mark the

horizontal boundaries of underground utilities and

piping Block E. The utility and EM surveys were

used to locate subsurface anomalies possibly

associated with buried objects and utilities, such

as catch basins, drains, sumps, pits, piping,

manholes, etc.

None None This investigation used several

techniques to locate, record, and

map subsurface utilities that may

act as preferential pathways for

groundwater contaminants.

None In 2011, a utility cross‑connection (UCC) investigation was completed for the southeastern portion of Block E area to design a pilot‑scale

groundwater-injection tracer test and the full‑scale groundwater remedial-system design. The UCC investigation included reviews of historical

drawings, employee interviews, site reconnaissance, geophysical surveys, field and closed-circuit television (CCTV) inspections of storm-drains and

professional land surveying to locate, record, and map subsurface utilities that may act as preferential migration pathways for groundwater

contaminants or bioremediation substrates that may be used to remedy VOCs in groundwater.

Historical and current utility records, site reconnaissance, and geophysical surveys indicate numerous underground utilities, an unknown linear

geophysical-anomaly, and an unknown area geophysical-anomaly in the Block E study area. Underground utilities include electrical lines,

telecommunication lines, domestic- and fire‑water lines, a former fuel pipeline, and storm drains.

Block E Storm Drain System

Interim Remedial Measures

Final Site Remediation

Report

Tetra Tech (2012f) Summer and Fall 2011 None None None None None A storm drain IRM removed sediment and debris from the drainage system piping and manholes, provided sediment controls, and repaired or

replaced inlets and manholes at Block E in the fall of 2011 to minimize the transport of contaminated sediments in the storm drain system to off‑site

locations and to allow free drainage of the Block E area.

Injection Pilot Test Tetra Tech (2012g) Fall 2011 Yes. To locate potential underground utilities for

well installation

None Installed injection well

and observation wells

for bromide injection

test in Block E

Sampling for bromide in

groundwater in wells and

surface water in catch basins

None An injection pilot test was performed in the southeastern portion of Block E in the area of the 500,000-gallon water tank to determine key design

parameters for a full scale bioremediation system for the eastern TCE plume. The test layout consisted of an injection well screened at a depth

interval of 15–35 feet and three monitoring well clusters approximately five feet, 10 feet, and 15 feet from the injection well. Each monitoring well

cluster consisted of two monitoring points: a deep interval (25–35 feet) and a shallow interval (10–20 feet).

Three separate 24 hour injection tests were performed at Block E: (1) a low rate test (approximately 0.3 gallon per minute); (2) an intermediate rate

test (approximately 0.5 gallon per minute); and (3) a high rate test (approximately 1 gallon per minute). Each test was performed by injecting an

aqueous sodium bromide tracer solution into the injection well and monitoring injection effects in nearby monitoring well clusters and from nearby

storm drain catch basins. Changes in hydraulic head and bromide tracer detections were used to evaluate the injections’ radii of influence.

During the high rate test, the water level in the injection well was only approximately five feet above the static level (approximately three feet below

ground surface). The bromide tracer was detected in all Block E deeper monitoring wells monitored for the test. In contrast, no bromide tracer was

detected in any shallow Block E well monitored for the test. Because of the detection of bromide in the storm sewer system during the pilot test,

particular care was recommended during the design and implementation of the full scale bioremediation system to be installed in Block E.

Validated data collected during the following environmental investigations were used to assess risks to potential human receptors:

• site wide Phase II investigation (2004)

• additional soil characterization (fall 2007)

• supplemental soil and storm-drain-sediment characterization (Block E fall 2008)

• data-gap investigation (fall 2010)

• additional investigation (summer 2011)

Table 2-1



Page 5 of 5



Sediment


Block E and G Pre-Design

Soil Sampling Investigation

Tetra Tech (2012h) Summer 2012 Yes. To locate potential underground utilities for

soil borings.

Twenty-five soil borings were advanced at 25 locations at

Block E. Most of the soil borings were advanced to a

maximum depth of ten feet using DP. Three borings in Block E

(E‑SB‑894, E‑SB‑898, and E‑SB‑902) were advanced to a

depth of 15 feet below grade to confirm that the deepest

sample from each boring was collected in the groundwater

table. Three samples were collected from soil boring and

checmially analyzed for various analytes. The analysis include

PCBs, PAHS, TPH-GRO/DRO, metals, hexavalent chromium

and pesticides.

None None None The 2012 investigation verified the continued presence of polychlorinated biphenyls (PCBs) in soils at Block E. The maximum PCB concentration

was 320 mg/kg, detected in boring E-SB-890 at 0 to 2 feet; concentrations decreased to 3 mg/kg at a depth of 2-4 feet in the same boring. Boring E-

SB-890 was advanced in the location of a former 500,000-gallon diesel fuel tank. Most of the PCB detections are confined to top two feet of soil in

and around the 500,000-gallon water tank in the southwest corner of Block E.

Polycyclic aromatic hydrocarbons (PAHs), expressed as benzo(a)pyrene equivalents (BaPEq), are also considered a primary risk driver in Block E

soils. BaPEq concentrations ranged from less than 3.5 µg/kg to a maximum of 2,104 µg/kg n sample E-SB-897-0-2. The residential screening

criterion of 140 µg/kg was exceeded in seven samples. Most of the BaPEq exceedances were located in the grass covered area surrounding the water

tank, and were collected in the 0-2 feet interval. An exception is sample E-SB-906-6-10, which was collected from a location north of the water tank

at a depth of 6-10 feet below grade.

Total petroleum hydrocarbons-diesel range organics (TPH-DRO) were detected in eight samples from three soil borings (E-SB-890, E-SB-905 and E-

SB-906), and at various depths. Several samples had concentrations that exceeded the residential screening criteria of 230 mg/kg. The highest

concentrations of TPH-DRO (15,000 and 4,800 mg/kg) were observed in samples collected from beneath the basement floor in former Building D

(samples E-SB-905-6-10 and E‑SB‑906-6-10), at a depth of 6-10 feet.

The hexavalent chromium and pesticide concentrations in Block E soil samples were below their respective residential criteria in the ten samples

analyzed.

Metals such as arsenic and vanadium were detected in soils collected from 10 samples. However, none of these metals exceeded their residential

criterion.

JOHNSONAND

TOWERS

CHESAPEAKE PLAZA

ANNEXBUILDING

VERTICALASSEMBLYBUILDING

PARKING LOT NO. 4

ATHLETICFIELD

PARKING LOT NO. 5

BUILDING "G"

BUILDING "A"

BUILDING "B"

BUILDING "C"

FORMER AERO PYHSICSLAB/ WIND TUNNEL

TEST BUILDING

FORMERBOAT HOUSE

FORMERRAMP STORAGE

BUILDING

FORMERTRAININGSCHOOL

SEVEN 1,000-GAL. AVIATION FUELUSTs ABANDONED IN-PLACE

FORMERHYDRAULIC AND FIELD

TEST BUILDING

NORTHAMERICANELECTRIC

FORMERSEWAGE

TREATMENTPLANT

CHESAPEAKE PARK PLAZA

FORMER BUILDING "D"

500,000-GAL.WATER TANK

FORMER 500-GAL. UST

FORMER 500,000-GAL.DIESEL FUEL AST

FIRE PUMP BUILDING WITH275-GAL DIESEL FUEL AST

TRANSFER SHED

WATERFRONT LOT

BUILDING "M"

PROGRAM

BUILDING


BUILDING "L"

PARKING LOT NO. 3

TILLEY CHEMICALCOMPANY

DROP HAMMERBUILDING

ACTIVE FIRING RANGE

DIESTORAGE

MAINTENANCEGARAGE

HAZARDOUS WASTESTORAGE BUILDING

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DRUMSTORAGEFACILITY

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POST OFFICE

BLOCK 'I'

BLOCK 'B'

BLOCK 'E'

BLOCK 'G'

BLOCK 'D'

BLOCK 'F'

BLOCK 'A'

BLOCK 'H'

BLOCK 'A'

FIGURE 2-1

MIDDLE RIVER COMPLEXSITE LAYOUT AND TAX BLOCKS

DATE MODIFIED: CREATED BY:11/30/11 MP

±


0 300 600150 Feet

Map Document: (K:\GProject\middle_river\Maps\Tax Blocks_30Nov11.mxd)11/30/2011 -- 6:20:16 PM

LEGEND

STRUCTURE

RAILROAD TRACKS

MIDDLE RIVER COMPLEXTAX BLOCK BOUNDARY

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FIGURE 2-2

GEOLOGIC CROSS-SECTIONLOCATIONS


±


LEGEND

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MARTIN STATE AIRPORT

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COMMUNITY(RESIDENTIAL)

Map Document: (K:\GProject\middle_river\Maps\Geologic Cross Section Locations_Aug 2010_revised062212.mxd) 6/22/2012 -- 11:02:06 AM

DEEP GROUNDWATER MONITORING WELL

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DATE MODIFIED: CREATED BY:9/7/10 K. MOORE

LEGEND


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FIGURE 2-5

GEOLOGIC CROSS-SECTION C-C'


LEGEND


FIGURE NUMBER

SCALE

DATE

AS NOTED

K:\GProject\middle_river\graphics\Block E former D building.cdr

4/24/12REV

FILE

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LOCKHEED MARTIN, MIDDLE RIVER COMPLEXMIDDLE RIVER, MARYLAND

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DATE MODIFIED: CREATED BY:9/27/12 LR

±


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Map Document: (K:\GProject\middle_river\Maps\Proposed DPT\Block E Utilities and Historical Operation Areas_revised 1 16 12.mxd)9/27/2012 -- 2:00:22 PM

FIGURE 2-7

FACTORY LAYOUT OF FORMERBUILDING D BASEMENT

(Source date: January 1957)

LEGENDUNDERGROUND SANITARY SEWER *

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REC #2

REC #1

FIRE PUMP BUILDINGWITH 275-GAL DIESELFUEL AST TRANSFERSHED

FORMER 500,000-GALDIESEL FUEL AST

BLOCK 'E'

BLOCK 'F'

BLOCK 'I'BLOCK 'D'

SB-555 A

SB-561 A

SB-541 A

SB-550 A

SB-544 A

SB-543 A

SB-570 A

SB-568 A

SB- 569

SB- 567

SB- 566

SB- 565

SB- 564

SB- 563

SB- 562

SB- 560

SB- 559

SB- 558

SB- 557

SB- 556

SB- 554

SB- 553SB- 552

SB- 551

SB- 550

SB- 549

SB- 548SB- 547

SB- 546

SB- 545SB- 544

SB- 543

SB- 542

SB- 541SB- 571

SB-345

SB-9

SB-2

SB-1

SB-6A

SB-3A

SB-36

SB-35

SB-2A

SB-1A

SB-19

SB-18

SB-17

SB-16

SB-15

SB-14

SB-13

SB-12

SB-11

SB-10SB-233

SB-232

SB-3

SB-5A

SB-21

SB-20

SB-235

SB-42

SB-41

SB-43

SB-515BaPEq 948 (0 - 1')BaPEq 924 (4 - 6')BaPEq 908 (8 - 10')

SB-346PCB 1.7 (0 - 1')

SB-350PCB 55 (0 - 1') SB-347

PCB 7.1 (0 - 1')

SB-516BaPEq 587 (0 - 1')

SS-537PCB 10 (0-0.5')

SS-540PCB 1.8 (0-0.5')

SS-538PCB 4.5 (0-0.5')

SS-539PCB 18 (0-0.5')

SB-519BaPEq 863 (0 - 1')BaPEq 878 (4-6')BaPEq 878 (8-10')

SS-534PCB 49 (0-0.5')

SS-535PCB 6 (0-0.5')

SS-536PCB 77 (0-0.5')

SB-356PCB 25 (0 - 1')

SB-504PCB 1.2 (0 - 1')BaPEq 486 (0 - 1')PCB 11 (4 - 6')BaPEq 2167 (4 - 6')PCB 2.3 (8 - 10')BaPEq 477 (8 - 10')

SS-532PCB 2.1 (0-0.5')

SB-502PCB 1.2 (0 - 1')BaPEq 5574 (0 - 1')PCB 49 (4 - 6')BaPEq 412 (4 - 6')PCB 65 (8 - 10')BaPEq 8782 (8 - 10')

SS-527PCB 62 (0-0.5')

SS-526PCB 82 (0-0.5')

SB-360PCB 27 (0 - 1')

SB-359PCB 3.7 (0 - 1')

SS-524PCB 52 (0-0.5')

SS-522PCB 3.4 (0-0.5')

SS-523PCB 2.1 (0-0.5')

SS-521PCB 3.1 (0-0.5')

SS-528PCB 34 (0-0.5')

SS-525PCB 54 (0-0.5')

SB-361PCB 140 (0 - 1')

SB-362PCB 5 (0 - 1')

SB-363PCB 24 (0 - 1')

SB-364PCB 12 (0 - 1')

SB-512BaPEq 398 (0 - 1')BaPEq 878 (4 - 6')BaPEq 510 (8 - 10')BaPEq 456 (8 - 10' D)

SB-358PCB 27 (0 - 1')

SB-357PCB 12 (0 - 1')

SB-355PCB 96 (0 - 1')

SB-354PCB 400 (0 - 1')

SB-353PCB 1800 (0 - 1')

SB-352PCB 19 (0 - 1')

SB-351PCB 21 (0 - 1')

SB-500BaPEq 542 (0-1')BaPEq 855 (4-6')BaPEq 924 (8-10')


SB-508BaPEq 878 (0 - 1')BaPEq 901 (4 - 6')BaPEq 901 (4 - 6 D')BaPEq 924 (8 - 10')


SB-510BaPEq 401 (0 - 1')BaPEq 878 (4 - 6')BaPEq 426 (8 - 10')BaPEq 419 (8 - 10 D')

SB-511BaPEq 825 (4 - 6')BaPEq 948 (8 - 10')


SB-514BaPEq 878 (0 - 1')BaPEq 924 (4 - 6')BaPEq 901 (8 - 10')BaPEq 901 (8 - 10' D)



E-SB-828DRO 1500 (9')

E-SB-827PCB 2.5 (7')PCB 260 (9')PCB 15 (13' DI)

E-SB-841PCB 25 (SS)

E-SB-839PCB 41 (SS)

E-SB-845PCB 37 (SS)

SB-506BaPEq 878 (0 - 1')BaPEq 878 (0 - 1' D)BaPEq 878 (4 - 6')BaPEq 971 (8 - 10')

SB-505PCB 99 (0 - 1')BaPEq 827 (0 - 1')BaPEq 878 (4 - 6')BaPEq 464 (8 - 10')

E-SB-844PCB 2.3 (SS)

SB-503PCB 1.7 (0 - 1')BaPEq 10999 (0 - 1')BaPEq 890 (0 - 1' D)TPH 650 (0-1')BaPEq 434 (4 - 6')BaPEq 901 (8 - 10')

E-SB-821

E-SB-818

E-SB-822

E-SB-819

E-SB-820

E-SB-823

E-SB-825

E-SB-824

SB-349PCB 24 (0 - 1')


E-SB-826

E-SB-832

E-SB-834

E-SB-829

E-SB-836

E-SB-840

E-SB-830

E-SB-837

E-SB-831

E-SB-843E-SB-842

E-SB-846

E-SB-838

E-SB-847

SB- 558PCB 1.6 (0-0.5')

E-SB-835PCB 3.5 (9')

SS-533PCB 53 (0-0.5')

SB- 568PCB 81 (0-0.5')PCB 11 (0.5-1')

SS-530PCB 690 (0-0.5')

SS-531PCB 190 (0-0.5')

SS-529PCB 1500 (0-0.5')

SB-501PCB 58 (0 - 1')BaPEq 8695 (0 - 1')PCB 5.8 (4 - 6')BaPEq 855 (4 - 6')PCB 24 (8 - 10')BaPEq 901 (8 - 10')

SB-348PCB 34 (0 - 1')

SB-4DRO 230 (5')

SB-4APCB 180 (0-0.5')DRO 330 (0-0.5')

SB-234PCB 1.07 (0-0.5')SB- 566

PCB 1.2 (0-0.5')

SB-5BaPEq 288 (0-0.5')

SB-546 APCB 9.6 (0-0.5')

SB-6BaPEq 286 (0-0.5')BaPEq 182 (5')

SB- 570PCB 6.8 (0-0.5')

SB- 561PCB 3.4 (0.5-1')PCB 4 (2')PCB 11 (4')

SB- 555PCB 17 (0-0.5')PCB 3.8 (0.5-1')PCB 3.8 (2')PCB 7.8 (4')


±


0 75 15037.5 Feet

Map Document: (K:\GProject\middle_river\Maps\Proposed DPT\Block E Historic Exceedances_091611_revised042312.mxd) 4/23/2012 -- 11:36:46 AM

FIGURE 2-8

HISTORICAL EXCEEDANCES OF PCBAND BAPEQ SCREENING LEVELSTHROUGH 2010BLOCK E

SCREENING LEVEL FOR PCBs IS 1.0 mg/kgSCREENING LEVEL FOR BaPEq IS 150 ug/kgSCREENING LEVEL FOR TPH-GRO AND DRO IS 230 mg/kg

PCB,TPH-GRO and DRO results are in units of milligrams per kilogram (mg/kg)BaPEq results are in units of micrograms per kilogram (ug/kg)(8-10' D) = DuplicateE-SB-833E (CS) = Concrete SampleE-SB-827-13' DI = Dilution SampleE-SB-839 (SS) = Surface SoilJ- Positive result is considered estimated as a result of technical non-compliance

LEGEND!? 2010 SOIL SAMPLE LOCATION

!( PREVIOUS SOIL SAMPLE LOCATION

G!. HYDRANT

"/ STORMWATER INLET

!@ ELECTRIC MANHOLE

!P MHSD


DRAIN CLEANOUTS

DRAIN CLEANOUT PIPES

FIRE WATER LINE

STORM SEWER

ELECTRIC

GAS

SANITARY

DOMESTIC WATER

TELEPHONE

g g GEOPHYSICAL SURVEY ANOMALY

BASEMAP REVISIONS

CONDENSATE

STEAM

ELECTRIC SUBSTATION

PARCELS

BUILDING FOOTPRINT

REC BOUNDARY

gg

gg

gg

g

gg

gg

gg

g

D

D

D

D

D

!(

!(

!(

!(!(

!(

!(

!(

!(

!(

!(

!(

!(

!?

!?

!?!?

!?

!?

!?!?

!?

!?

!?

!?

!?

!?

!?

E-SB-833MPCB 1.3 (2')

E-SB-833NBaPEq 294 (6')

E-SB-833IPCB 220 (8')DRO 460 (DI) (8')PCB 350 (10')BaPEq 198 (10')

E-SB-833BPCB 1.7 (2')

E-SB-833DRO 28000 (9')PCB 24000 (9')PCB 61 (11')

E-SB-833KPCB 3.1 (CS)PCB 680 (2')BaPEq 1788 (2')DRO 1400 (2')PCB 970 (6')DRO 310 (6')PCB 35 (8')PCB 270 (10')BaPEq 163 (10')DRO 590 (10')

E-SB-833LPCB 4.5 (6')PCB 700 (8')DRO 450 (8')

E-SB-833EPCB 1.1 (CS)PCB 360 (2')DRO 640 (2')PCB 180 (6')DRO 1900 (DI) (6')PCB 27 (10')

E-SB-833FPCB 1600 (CS)PCB 25 (2')PCB 2.3 (6')PCB 1 (10')

E-SB-833APCB 1.4 (CS)BaPEq 323 (2')DRO 8900 (2')PCB 510 (6')BaPEq 461 (6')PCB 2000 (10')BaPEq 462 (10')

E-SB-833JPCB 3 (2')

SB-550

E-SB-833C

E-SB-833D

SB-349

SB-234

SB-348

E-SB-833G

E-SB-833H

SB-350

SB-349PCB 24 (0 - 1')

SB-348PCB 34 (0 - 1')

0 30 60 Feet

"/

!P

!P

!P

!P

"/

"/

"/

!@

!P

gO

!P

"/

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"/

"/

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D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

DD

D

D

D

D

D

D

D

D

D

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!(

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WATERFRONT LOT

FORMER 5000-GALDIESEL FUEL AST

REC #2

REC #3

REC #1 FIREWATER LINE

BLOCK 'E'

BLOCK 'F'

FORMER500-GAL

UST

SB-565

E-SB-821

E-SB-826

E-SB-828

E-SB-829

E-SB-830

E-SB-832

E-SB-834E-SB-835

E-SB-836

E-SB-839

E-SB-840

E-SB-841

E-SB-842

E-SB-844

E-SB-845

E-SB-837

E-SB-831

E-SB-827

E-SB-833N

E-SB-833M

E-SB-833J

E-SB-833I

E-SB-833A

E-SB-833BE-SB-833C

E-SB-833D

E-SB-833E

E-SB-833F

E-SB-833G

E-SB-833H

E-SB-833

E-SB-833L

E-SB-833K

SB-541A SB-542

SB-551

SB-550A

SB-4A

SB-552

SB-564

SB-559

SB-567

SB-558

SB-563

SB-568

SB-568A

SB-557

SB-553

SB-543A

SB-547

SB-546A

SB-546

SB-545

SB-548

SB-569

SB-561A

SB-561

SB-556

SB-543

SB-544

SB-234

SB-554

SB-550

SB-549

SB-6

SB-5

SB-4

SB-505

SB-6A

SB-9

SB-36

SB-35

SB-1A

SB-16

SB-15

SB-14

SB-13

SB-11

SB-10

SB-235

SB-233

SB-232

SB-17

SB-12

SB-41

SB-43

SB-566

SB-5A

SB-540SB-539SB-538

SB-536 SB-535

SB-532

SB-531SB-530

SB-527

SB-526

SB-519

SB-518

SB-516

SB-515

SB-513

SB-508

SB-507

SB-506SB-504

SB-502

SB-501

SB-364

SB-363

SB-362

SB-360

SB-359

SB-358

SB-357

SB-356

SB-355

SB-354

SB-353

SB-352

SB-351

SB-346

SB-345

SB-537

SB-534SB-533

SB-529

SB-525

SB-520SB-517

SB-503

SB-361

SB-350

SB-348

SB-347

SB-349

SB-560

E-SB-848PCB 200 (8')

E-SB-852PCB 3,300 (1')PCB 120 (12')PCB 17 (16')PCB 15 (19')PCB 2.9 (24')PCB 1.2 (28')PCB 9.3 (30')

E-SB-853PCB 4.3 (8')PCB 19,000 (12')PCB 780 (16')PCB 12 (20')PCB 270 (24')PCB 4.3 (28')PCB 1.5 (28.5')

E-SB-854PCB 9.1 (0 - 2.5')PCB 470 (8')PCB 2 (12') E-SB-855

PCB 680 (12')PCB 16 (16')

E-SB-856

E-SB-860PCB 5.9 (0 - 0.5')

E-SB-861PCB 400 J (0 - 0.5')PCB 680 J (0 - 0.5')(D)

E-SB-862PCB 880 (0 - 0.5')PCB 18 K (0.5 - 2')

E-SB-863PCB 1.6 J (0- 0.5')

E-SB-864PCB 1,100 (0 - 0.5')PCB 2.2 J (0 - 2')

E-SB-865PCB 17 K (0 - 0.5')

E-SB-866PCB 1.9 (0 - 0.5')

E-SB-867PCB 7.7 L (0 - 0.5')

E-SB-868PCB 110 J (0 - 0.5')PCB 450 (0 - 0.5')(D)

E-SB-869PCB 170 (0 - 0.5')PCB 1.6 (0.5 - 2')

E-SB-870PCB 480 K (0 - 0.5')PCB 3.1 (0.5 - 2')

E-SB-871PCB 75 (0 - 0.5')PCB 3.7 J (0.5 - 2')E-SB-874

E-SB-849

E-SB-850

E-SB-872

E-SB-873

E-SB-857

E-SB-859

E-SB-858E-SB-851


±


0 30 6015 Feet

Map Document: (K:\GProject\middle_river\Maps\Proposed DPT\Block E 2011 Sample Locations Exceedances_PCB revised 11 03 11.mxd)11/11/2011 -- 2:31:33 PM

FIGURE 2-9

PCB RESULTS IN BLOCK E SOILSAMPLES EXCEEDING THE RESIDENTIALUSE SCREENING LEVEL - JULY ANDAUGUST 2011

D

D

D

D

D

D

D

D

D

DD

D

DD

D

DD

D

D

D

D

D

D

D

DD

DD

DD

DD

DD

DD

D

D

D

D

D

D

D

D

Area Shown

DARK HEAD COVE

BLOCK 'I'

BLOCK 'E'

BLOCK 'F'

BLOCK 'G'

BLOCK 'D'

RESIDENTIAL SCREENING LEVEL FOR PCBsIS 1 mg/kgPCB results are in units of milligrams per kilogram (mg/kg)E-SB-833E (CS) = Concrete Sample(D) = DuplicateJ- Positive result is considered estimated as a result of technical non-complianceK- Positive result is considered to be biased high as a result of technical non-complianceL- Positive result is considered to be biased low as a result of technical non-compliance

LEGEND!. JULY 2011 SOIL SAMPLE LOCATION!. AUGUST 2011 SOIL SAMPLE LOCATION!( PREVIOUS SOIL SAMPLE LOCATION

G!. HYDRANT

"/ STORMWATER INLET!@ ELECTRIC MANHOLE!P MHSD


DRAIN CLEANOUTSDRAIN LINESFIRE WATER LINE(ABANDONED)STORM SEWERELECTRICGASSANITARYDOMESTIC WATERTELEPHONEBASEMAP REVISIONSCONDENSATESTEAMELECTRIC SUBSTATIONPARCELSBUILDING FOOTPRINTREC BOUNDARY

?

Soil Boring No.

Analyte Concentration (Depth: feet below grade)

Sample Tag Key:

!?!?

!?

!?

!?

!?

!?

!?!?

!?

!?

!?

!?

!?

!?

!?

!?

!?

!? !?

!?!?

!?!?

!?

500,000Gallon Water

Tank

REC #2Product Pipeline

REC #3Former 500,000gallon Diesel Fuel AST

Fire Pump Buildingwith 275 Gal Diesel Fuel AST

BLOCK 'E'

SB-556

SB-524SB-523SB-522SB-521

SB-842

SB-843

SB-846

SB-847

SB-571

SB-830

SB-831

SB-837

SB-838

SB-841

SB-845

SB-500

SB-501

SB-508

SB-509

SB-511

SB-548

SB-555

SB-570

SB-36

SB-6A

SB-6

REC #3

SB-555A

SB-570A

SB-529SB-530SB-531SB-532SB-568

SB-547

SB-561ASB-561

SB-525SB-526SB-527SB-528SB-569

E-SB-886E-SB-887

E-SB-888PCB 2 J (0-2')BaPEq 180 (0-2')

E-SB-891

E-SB-898

E-SB-899

E-SB-900

E-SB-902E-SB-901

E-SB-903

E-SB-904

E-SB-907

E-SB-908E-SB-909

E-SB-910

Planned InjectionEquipment Trailer

E-SB-889BaPEq 180 (0-2')

E-SB-890PCB 320 (0-2')PCB 3 (2-4')TPH-DRO 2400 (0-2')

E-SB-891BaPEq 188 (0-2')

E-SB-892BaPEq 205 (0-2')

E-SB-893PCB 1.6 (0-2')

E-SB-894PCB 2.8 (0-2')

E-SB-895PCB 3.9 (0-2')

E-SB-896PCB 1.4 (0-2')BaPEq 462 (0-2')

E-SB-897PCB 4.2 (0-2')BaPEq 2104 (0-2')

E-SB-906BaPEq 191 (6-10')TPH-DRO 2000 J (2-6 D')TPH-DRO 4800 (6-10')

E-SB-905TPH-DRO 703 J (2-6')TPH-DRO 15000 (6-10')

Map Document: (K:\GProject\middle_river\Maps\Proposed DPT\Block E PreDesign Soil Sample locations Surveyed_June2012 exceedances_revised.mxd)9/21/2012 -- 11:29:49 AM

MIDDLE RIVER COMPLEX

INSET MAP

BLOCK 'I'

BLOCK 'B'

BLOCK 'E'BLOCK 'G'

BLOCK 'A'

BLOCK 'D'

BLOCK 'F'

BLOCK 'H'

BLOCK 'A'

FIGURE 2-10

BLOCK E PRE-DESIGN SOIL-SAMPLE RESIDENTIAL-USESCREENING LEVELEXCEEDANCES

* Obtained from historical plans and drawingsREC- Recognized Environmental ConditionAST- Aboveground Storage TankBaPEq - Benzo(a)pyrene EquivalentTPH-DRO - Total Petroleum Hydrocarbons DieselRange OrganicsPCB - Polychlorinated Biphenyl

!?

Proposed Trench

Proposed Injection Piping

(boring to be placedwithin approximateproposed trenchwidth)

Detail of Approximate Trench Sample Placement:


±


0 10 205 Feet

0 3 6 Feet

PCB and TPH-DRO concentrations are in milligrams perkilogram (mg/kg)Residential screening level for PCB is 1 mg/kgResidential screening level for TPH-DRO is 230 mg/kgBaPEq concentrations are in micrograms per kilogram (ug/kg)Residential screening level for BaPEq is 140 ug/kg

J= Estimated ValueD= Duplicate Value

!(!(!(!( >20 feet

0-4 10-20 feet

4-10 feet

SAMPLE DEPTH

LEGEND

!? PRE-DESIGN SOIL BORING 2012

PCB Levels in Surface and SubsurfaceSoil Samples - Pre-2012 Samples

< 1.0 mg/kg

> 1 - 50 mg/kg

> 50 - 100 mg/kg

> 100 mg/kg

BLOCK E PLANNED GROUNDWATERREMEDIAL SYSTEM LAYOUT

!P PROPOSED INJECTION WELLS

G!. HYDRANT

"/ STORMWATER INLET

!@ ELECTRIC MANHOLE

!P MHSD (MANHOLE SEDIMENT)


FUEL OIL LINE *

FIRE WATER LINE *

STORM SEWER

D EXISTING FENCE

REC AREA

BUILDING FOOTPRINT

TAX PARCELS

Soil Boring No.

Analyte Concentration (Depth: feet below grade)

Sample Tag Key:


Section 3

Investigation Approachand Methodology

The primary objectives of the 2012 Block E investigation were to review historical data and

collect additional soil-chemical data to better identify and evaluate the horizontal and vertical

extent of polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), volatile

organic compounds (VOCs), total petroleum hydrocarbon (TPH)-gasoline range organics

(GRO), TPH-diesel range organics (DRO), and metals (including hexavalent chromium [CrVI])

in soils. These data were obtained to complete an updated human health risk assessment

(HHRA) and to aid remedy selection. An additional objective is to better understand the

foundation of the existing concrete slab underlying the former Building D, which will be used to

evaluate impacted soils and their potential migration pathways.

The investigation objectives were to be achieved through a phased approach using the data from

this first phase (Phase I) to guide a second phase (Phase II) of the work. This report only presents

details of the Phase I activities, which includes a limited geophysical survey of the former

Building D basement, additional sampling of the concrete slabs for PCBs, and sampling of soil

and groundwater around the periphery of former Building D and at a possible PCB source area in

the southwestern area of Block E. The 2012 Block E program entailed the following activities:

mobilized/demobilized equipment and staff, including obtaining site access, utilityclearance, and permitting

performed high-resolution surface/subsurface electrical-resistivity imaging (ERI)focusing within the southwest quadrant of the former Building D, which coveredapproximately 600 feet by 270 feet, using a 1.5-meter electrode 60-foot-grid spacing, andobtained 18 images to a maximum depth of 55 feet below grade. The survey wasconducted in an area of elevated PCB concentrations in the surface and subsurface soil.

collected concrete surface samples at 40 locations from the former Building D concreteslab to evaluate current risk to site workers from PCBs. Six concrete samples were alsoanalyzed for asbestos for waste characterization purposes.


advanced shallow soil borings at 28 locations to a depth of four feet below grade tofurther investigate PCBs, PAHs, metals, and CrVI in soil along the periphery of theformer Building D foundation

advanced deep soil borings at six locations (based on results of the ERI survey) to40–50 feet below grade to further characterize PCBs, PAHs, VOCs, TPH, and metals insoil in areas near the former waste disposal area and former transformer room

selected concrete and soil samples from the concrete, peripheral, and deep borings weresent for radiological analyses (see Appendix A)

collected shallow groundwater samples from soil borings for chemical analyses andmeasurements of field parameters

collected groundwater levels from Block E wells

collected, stored, and characterized investigation-derived waste (IDW). IDW wasdisposed of at a Lockheed Martin Corporation (Lockheed Martin)-approved off-sitetreatment and disposal facility.


reviewed historical maps and figures to gain insight into the construction and locations ofunderground utilities at the former Building D, and to assess historical operations thatmay have led to the release of the identified contaminants of concern (COC). Thehistorical review is not discussed in this section but its findings are incorporated into thesite discussions in Section 4.

3.1 MOBILIZATION/DEMOBILIZATION

Tetra Tech, Inc. (Tetra Tech) procured the required subcontractors and began mobilization in

June 2012. Mobilization included:

coordinating with Lockheed Martin Middle River Complex (MRC) personnel

obtaining utility clearance in the geophysical survey area and soil boring locations usinga private firm (as described in Section 3.2)

mobilizing subcontractors, equipment, personnel, and materials to the site

implementing a site-specific health and safety plan (HASP)

arranging a decontamination area

Demobilization activities include:

demobilizing equipment and materials from the site


performing general site cleanup and trash removal at work completion

repairing landscaping, ground, and other surfaces as necessary at work completion

managing IDW (as described in Section 3.10)

The Tetra Tech field operations leader coordinated the mobilization and demobilization,

including inventorying equipment to ensure its availability, purchasing and leasing equipment as

required, and staging equipment for efficient loading and transport to and from the site after each

activity.

Appropriate Tetra Tech personnel familiarized themselves with the site-specific HASP and the

respective safe work permits. Tetra Tech held mandatory health and safety tailgate meetings for

all workers involved, including subcontractors, before each day’s field events. All personnel

working on-site received site-specific safety training from the Lockheed Martin safety manager.

Subsequent to this training, subcontractors were issued a security pass allowing site access.

Tetra Tech coordinated access to Block E work areas through Lockheed Martin and obtained

utility clearances for the areas of the proposed soil borings, including completing the dig

authorization form and risk-handling checklist and following EO-28 requirements governing

intrusive fieldwork. This also includes notifying Miss Utility, the underground utility-location

center, reviewing facility utility maps (including the site plan) (TAI, October 2002), and

engaging a private utility-locating contractor (Enviroscan, Inc.). Miss Utility personnel generally

will not mark utilities on private property, so Enviroscan, Inc. was employed to clear subsurface

sampling locations. Tetra Tech met directly on-site with Miss Utility and Enviroscan personnel to

review proposed sampling locations, provide utility clearance personnel with accurate maps, and

discuss any potential issues related to subsurface utilities.

Enviroscan, Inc. conducted geophysical surveys to mark all underground utility lines within a

30-foot radius of each proposed soil boring. A combination of electromagnetic

resistivity/conductivity, line locating, and ground-penetrating radar (GPR) ensured that all

proposed sampling locations would avoid underground utilities. Borings requiring relocation

because of conflicts with existing subsurface obstructions were positioned as close as possible to

their original locations. Refer to Appendix B for the Enviroscan utility clearance report.


3.2 SUBSURFACE ELECTRICAL RESISTIVITY IMAGING

High-resolution ERI surveys were used at the southwestern portion of Block E to assess the

complex subsurface structure beneath the Building D foundation that includes concrete, fill,

underground utilities, potential voids, heterogeneous geology, and soil contamination. The ERI

survey was conducted by Aestus, LLC, a geophysical survey firm based in Loveland, Colorado.

Aestus was selected based on their prior experience identifying subsurface utilities, geologic

lithology, residual pockets of light non-aqueous phase liquids (LNAPLs)/dense non-aqueous

phase liquids (DNAPLs), and the extent of dissolved-phase contamination using ERI. The survey

was performed along multiple survey alignments focusing on the areas around the former waste

disposal area and former transformer room and the grassy area south of former Building D, in an

area where high concentrations of PCBs have been detected in soil, and where PCB-containing

DNAPL was observed during a recent subsurface investigation.

Figure 3-1 presents the locations of the ERI survey transects. The survey results were used to

produce two-dimensional and quasi-three-dimensional, color-shaded images of subsurface

electrical resistivity and conductivity that illustrate the presence or absence of subsurface

anomalies such as subsurface utilities, LNAPL, and DNAPL. The series of two-dimensional

images were combined to visualize the subsurface electrical resistivity of the site in three

dimensions.

Aestus compiled the ERI survey results in a report included here as Appendix C. It details methods,

compiles and tabulates results, and provides interpretations and conclusions regarding the

subsurface utilities, geology, and distribution and possible source of identified contaminants. The

ERI methodology is therefore not repeated in this section. To help interpret the ERI results, soil

samples were collected from four soil borings and analyzed for PCBs, PAHs, TPH, and metals.

3.3 CONCRETE SAMPLING

Forty concrete surface samples were collected from the former Building D concrete flooring

(including the former Building D footprint and the concrete slab south of the former Building D

footprint along the Chesapeake Park Plaza roadway) to evaluate current risk to site workers.

Concrete surface samples were collected by drilling a hole approximately ½-inch deep into the


concrete surface using a one-inch-diameter carbide drill-bit to generate approximately 10 grams

of powder (USEPA, 2005).

Figure 3-2 presents the locations of concrete surface samples, and Table 3-1 presents the

rationales for the sampling locations, sample analyses conducted, and analytical methods used.

Concrete samples were sent to the laboratory for PCBs analysis. Additionally, six of the samples

from SB-934, SB-944, SB-949, SB-950, SB-953, and SB-961 were sent for asbestos analysis.

3.4 SOIL SAMPLING

The sampling program advanced 28 shallow soil borings along the periphery of the former

Building D footprint in areas of limited or no previous sampling. Additionally, six deep soil

borings were advanced in areas near the former waste disposal area and former transformer

room. Two borings were designed as step-out sampling locations, to further delineate

constituents in soil in the area of high PCB concentrations and previously observed oily product.

Four borings were advanced in areas of the ERI survey to provide confirmation data for the ERI

results. Figures 3-3 and 3-4 show the locations of the peripheral and deep soil borings,

respectively. Tables 3-2 and 3-3 present the rationales developed for the sampling locations.

Table 3-4 lists the methods used for the chemical analyses.

3.4.1 Peripheral Shallow Soil Sampling

Shallow soil borings were advanced, using direct-push technology (DPT), to approximately

four feet below grade by a Maryland-licensed driller. Continuous soil samples (DPT macrocores)

were collected in each boring for lithologic description and field screening using a

1.5-inch-diameter stainless-steel MacroCore™ sampler fitted with a disposable liner. The probe

sampler was advanced and the retrieved soil inspected by a qualified Tetra Tech field geologist

for lithologic characteristics, staining, discolorations, and odors. Soil was categorized using the

Modified Burmister system. Additionally, the soil was screened in the field for volatile organic

compounds (VOCs) using a photoionization detector (PID), and for alpha, beta, and gamma

radiation using dual-phosphate and scintillation probes.

All pertinent information, including boring location, soil/lithology description, sample

designation and depth, PID readings, sample collection time, etc., was recorded on boring-log

forms and soil-sample log sheets. Boreholes were backfilled with granular bentonite to within


0.5-foot of the ground surface, hydrated, and then filled to grade with like material (i.e., soil,

gravel, or concrete). The logs for the shallow borings are included in Appendix D. Results of the

radiation screening are in Appendix A.

After lithologic logging and field screening, soil from the designated sampling intervals was

collected and immediately placed in the appropriate sample containers and handled as described

in Section 3.5. In general, discrete soil samples were collected from four intervals in each boring;

thus, four samples were collected from each soil boring at 0–0.5 feet (except where concrete was

present), 0.5–2 feet (or, proceeding from the bottom of concrete downward to two feet), 2–3 feet,

and 3–4 feet below grade. At locations with a concrete or paved surface, the sampling depth was

recorded in feet below the top of the concrete or paved surface. Sampling depths and the number

of samples collected were modified based on soil recovery and observations made during sample

collection. Sample record sheets are provided in Appendix E.

The laboratory was instructed via written chain of custody forms to analyze the upper two

samples, and to hold the analyses of the other two samples pending results of the upper two

samples (or hold the deepest sample if only three soil samples were collected, as in the case of

locations with concrete samples [e.g., E-SB-970]). The lower samples were analyzed for PCBs

only if PCBs were detected in the upper samples at concentrations greater than 1 mg/kg.

Similarly, the lower samples were analyzed for PAHs only if PAHs were detected in the upper

samples at concentrations greater than 0.14 mg/kg.

3.4.2 Deep Soil Sampling

Six deep soil borings were advanced in the southeastern portion of Block E to further delineate

the extent of PCBs and to provide subsurface data to evaluate the ERI survey results. The

locations of the deep borings are shown in Figure 3-2. Deep soil borings E-SB-983 and

E-SB-984 were advanced to delineate COC south and east of high PCB concentrations detected

in the southeastern portion of Block E. Soil Boring E-SB-983 was in the former waste disposal

area shown on historical Building D drawings. This boring was also south–southeast of previous

boring E-SB-852, which had a PCB concentration of 3,300 mg/kg at one foot and 120 mg/kg at

8–12 feet below grade. Soil boring E-SB-984 was northwest of previous soil boring E-SB-853,

where PCB concentrations were detected at 19,000 mg/kg (8–12 feet) and 780 mg/kg


(12–16 feet), and PCBs were detected above the site screening level (1 mg/kg) at concentrations

ranging from 1.5–27 mg/kg at 20–28 feet below grade.

Recommendations in the geophysical survey report led to advancement of four confirmation

borings (E-CB-2, E-CB-11A, E-CB-11B, and E-CB-13) to provide lithologic and chemical data

for areas of anomalous ERI readings. Borings E-CB-11A and E-CB-11B were advanced in areas

of high subsurface conductivities. Borings E-CB-2 and E-CB-13 were advanced in areas of high

resistivities.

Generally, soil samples for chemical analyses were collected continuously at two-foot intervals

from the top of each boring to 20 feet, and at four-foot intervals from 20 feet to the bottom of

each of the six borings. The RotoSonic method involved using a six-inch by eight-inch drill

rod/override-casing set-up (with temporary casing) to advance drilling to the target depth. The

override casing is designed to seal the upper portions of the soil column, thereby precluding the

downward movement of contamination from the shallow to deeper intervals during drilling. Soil

borings were advanced to depths ranging from 40 feet at E-SB-983, E-SB-984, and E-CB-11B to

50 feet at E-CB-11A and E-CB-2. Boring E-CB-13 was advanced to a depth of 46 feet below

grade.

Soil was cored continuously using a 10-foot core-barrel. The retrieved soil was inspected by a

qualified Tetra Tech field geologist for lithologic characteristics, staining, discolorations, and

odors. Soil was categorized using the Modified Burmister system. Additionally, the soil was

screened in the field for VOCs using a PID, and for alpha, beta, and gamma radiation using dual

phosphate and scintillation probes. All pertinent information, including boring location,

soil/lithology description, sample designation and depth, PID readings, sample collection time,

etc., was recorded on boring-log forms and soil-sample log sheets. After sonic drilling, the

boreholes were backfilled to within 0.5-foot of the ground surface using bentonite-cement grout,

and then filled to grade with like material (i.e., soil, gravel, or concrete). The logs for the deep

boring are in Appendix D. Results of the radiation screening are in Appendix A.

3.5 GROUNDWATER LEVELS AND SAMPLING

Groundwater levels and water quality parameters were collected from 32 groundwater

monitoring wells, 10 storm-sewer catch basins and manholes, and four concrete boreholes to


provide a concurrent set of groundwater data for evaluating the ERI survey results. Water quality

parameters of pH, specific conductance, salinity, temperature, and depth to water were measured

and recorded for the study. Water quality measurements could not be obtained at catch basin

CB-2 due to insufficient water volume in the catch basin. A grab groundwater sample was

collected from boring E-SB-976 (boring depth of five feet) to evaluate contaminants of concern

(COC) in shallow groundwater near the former waste disposal area.

3.6 SAMPLE NOMENCLATURE

Each concrete and soil sample was identified with a unique sample designation. The sample

designation includes information for the tax block parcel (“E” for Block E), then “SB” for soil

boring, followed by the boring number (e.g., 979). The letters “CB” for confirmation boring were

used for the four borings installed to assess the ERI survey results. For concrete samples, the soil

boring location was followed by the letters “CS” to designate it as a “concrete sample.” Sample

designations for both concrete and soil samples include ending digits that represent the top and

bottom depths of the sampling interval. For example, E-SB-979-2-3 would be a sample from

boring location 979 in Block E, collected at a depth of 2–3 feet below grade.

3.7 SAMPLE HANDLING

Sample jars collected were labeled and placed on ice pending delivery to the analytical

laboratory. Sample labels include a unique sample designation, the date and time the sample was

collected, name of the person(s) collecting the sample, and the specific analyses requested from

the laboratory (see Section 3.9). Samples were submitted to the analytical laboratories for

analyses of PCBs, PAHs, VOCs, TPH-GRO, TPH-DRO, metals, and asbestos. Sample handling

for radiological samples is discussed in Appendix A.

Samples were handled according to field-related considerations concerning the selection of

containers and preservatives, allowable holding times, and the analyses requested. Proper chain

of custody procedures were followed throughout all phases of sample collection and handling to

ensure the evidentiary integrity of sample containers. These protocols demonstrate that the

samples have been handled and transferred in a manner that minimizes as well as detects

possible tampering or cross-contamination.


Signatures were required to release sample containers from the laboratory. Samples were

accepted under signature either by the sampler(s), or by an individual responsible for maintaining

custody, until the sample containers were transferred to the sampler(s). Transport containers

returned to the laboratory were sealed with strapping tape and a tamper-proof custody seal. The

custody seal includes the signature of the individual releasing the transport container, along with

the date and time.

3.8 DOCUMENTATION

A master site logbook was maintained as an overall record of field activities for the Block E

project. Defining soil characteristics and visual indicators of possible contamination (such as

staining and/or soil discoloration) were logged for each boring. The soil-boring logs are in

Appendix D.

Sample documentation consists of the completed chain-of-custody reports and matrix-specific

sample log sheets. All pertinent information, including soil boring location, sample designation

and depth, and sample collection date and time, was recorded on a soil-sample log sheet.

Sampling log sheets are also in Appendix E.

The chain-of-custody report is a standardized form documenting such pertinent sample

information as sample identification and type, matrix, date and time of collection, preservation,

and analysis requested. These procedures and documentation ensure both a complete record and

the integrity of sample acquisition. Chain-of-custody forms are in Appendix F as part of the data

validation reports.

3.9 LABORATORY ANALYSES

For the 2012 additional investigation, more than 300 samples were shipped to TestAmerica Inc.

in North Canton, Ohio. Samples were analyzed by TestAmerica for PCBs and subsets of soil

samples were analyzed for PAHs, VOCs, TPH-GRO, TPH-DRO, and metals using the methods

listed in Table 3-4. Samples for asbestos were analyzed by EHS Laboratories of Richmond,

Virginia. Seventy-seven samples were also collected for radiological analyses (Appendix A).

Field-duplicate samples were not collected during this investigation. Table 3-5 lists the samples

collected and analyses performed for each sample, including radiological analyses.


3.10 SURVEYING

Boring locations and the ERI transect lines were surveyed by a Tetra Tech survey team under the

direction of a Maryland-licensed professional land surveyor. The survey team used global

positioning system (GPS) technology with sub-meter accuracy to locate and provide horizontal

and vertical coordinates for each boring and survey line. Coordinates for the soil borings and

survey lines are in the survey report” included as Appendix G.

3.11 EQUIPMENT DECONTAMINATION

An equipment decontamination area was established at the perimeter of the restricted work zone

to prepare and break down sampling equipment and to contain rinsing solution until it could be

properly disposed of. Small, reusable equipment and supplies (i.e., DPT rods, augers, scoops,

etc.) were decontaminated before and after each use, as follows:

Alconox® and potable-water wash

potable-water rinse

thorough rinsing and wetting the equipment with reagent-grade isopropanol

analyte-free water rinse

air drying

3.12 WASTE MANAGEMENT

Investigation-derived waste (IDW) consisted of soil cuttings, concrete, decontamination-rinsate

water, and personal protective equipment (PPE) generated during Block E sampling. PPE IDW

was disposed of as general refuse. Soil cuttings, concrete fragments, and decontamination water

were collected and stored in United States Department of Transportation (USDOT)-approved

55-gallon drums. Wastes were then characterized and disposed of in accordance with

applicable state and federal regulations. The IDW was removed from the facility and properly

disposed of at a Lockheed Martin-approved disposal facility in accordance with federal, state,

and local regulations. Waste characterization and disposal documentation is provided in

Appendix J.

3.13 DATA VALIDATION

Data validation involves having a party independent of the analytical laboratory review the

laboratory data to ensure that specific criteria were met. These criteria are concerned with


specifications that are not sample-dependent; they specify performance requirements that should

be fully under a laboratory’s control. For organic data analyses, specific validation areas include

blanks, performance-evaluation-standard materials, and instrument-performance checks. For

inorganic data analyses, specific validation areas include blanks, calibration standards,

calibration-verification standards, laboratory control standards, and interference-check standards.

Chemical data were supplied by the laboratory as hard-copy reports and electronic databases.

After the sampling was completed, the chemical data were validated to assess their reliability and

accuracy, in accordance with established United States Environmental Protection Agency

(USEPA) protocols. This review was based on the USEPA Region 3 guidelines (USEPA, 1993

and 1994) and the specifics of the analytical method employed. Data validation reports with COC

are in Appendix F.

Collectively, these data are acceptable for their intended use, except for data that have been

qualified as unreliable. For this validation, the following data qualifiers (i.e., flags) were applied

to the chemical results presented in this report:

B The analyte was not detected substantially above the level reported in the laboratoryor field blank (i.e., the result is considered an artifact of the laboratory analysis and isnot considered a site contaminant).

U Not detected. The analyte is considered not detected at the reported value.

J The analyte is considered present in the sample. However, the value is estimated andmay not be accurate or precise.

L The analyte is considered present in the sample. However, the value is biased low andthe actual value is expected to be higher than the reported value.

NJ The analyte has been tentatively identified. This qualifier indicates presumptiveevidence of a compound. Special methods may be required to confirm its presence orabsence in future sampling efforts.

UJ The analyte was not detected. However, the quantitation or detection limit may beinaccurate or imprecise.

UL The analyte was not detected. However, the quantitation or detection limit is likelygreater than the reported value.

UR The result is considered qualitatively or quantitatively unreliable. Only the results(i.e., non-detected results) for 2-butanone, tertiary butyl alcohol, and vinyl acetatewere flagged with “UR” data qualifiers.


The “J” and “L” qualifiers appear in the chemical results tables and the figures in Section 4. All

flags appear in Appendices F and H.

Common laboratory or field contaminants occasionally may be detected in the samples. The

analysis of quality control blanks and other internal laboratory blanks (e.g., method blanks, etc.)

are used to determine the significance of the analytical results versus possible laboratory or field

contaminants. Common laboratory contaminants for VOCs include acetone, methylene chloride,

and 2-butanone. According to USEPA national functional laboratory guidelines, any compound

detected in both the sample and an associated blank must be qualified (i.e., flagged with a “B”)

when the sample concentration is less than five times the concentration detected in the blank.

For the common laboratory contaminants (listed above), results were qualified with a “B” flag

when the sample concentration was less than 10 times the blank concentration. In addition to the

common laboratory blanks listed above, in many instances several TPH and common metals

were reported as blank contamination. Qualified results are presented in the chemical tables in

Section 4 and Appendices F and H.

3.14 DATA MANAGEMENT

Laboratory data handling procedures met the requirements set forth in the laboratory subcontract.

All analytical and field data are maintained in the project files. The project files contain copies of

the chain of custody form, sampling log forms, sampling location maps, and data quality-

assurance documentation.

3.14.1 Data Tracking and Control

A “cradle to grave” sample tracking system was used from the beginning to the end of the

sampling event. The field operations leader coordinated sample tracking before field

mobilization. Sample jar labels were handwritten in the field. Labels were reviewed to ensure

their accuracy and adherence to work plan requirements. The project manager’s (PM) assistant

coordinated with the analytical laboratory to ensure that they were aware of the number and type

of samples and analyses to expect.

When field sampling was underway, the field operations leader forwarded the chain of custody

forms to the PM’s assistant and the laboratory for each day that samples were collected. The


PM’s assistant confirmed that the chain of custody form provided the information required by the

work plan. This allowed early detection of errors made in the field so adjustments could be made

while the field team was mobilized. The laboratory submitted an electronic deliverable for the

sample delivery groups. When all electronic deliverables were received from the laboratory, the

PM’s assistant confirmed that the laboratory performed all analyses requested.

3.14.2 Sampling Information

Data from field measurements were recorded using the appropriate log sheets as per Tetra Tech,

Inc. (Tetra Tech) standard operating procedures. Reduction of field data entailed summarizing

and presenting these data in tabular form. Reduction of laboratory data entailed manipulation of

raw data-instrument output into reportable results. Laboratory data were verified by the group

supervisor and then by the laboratory’s quality control/documentation department.

3.14.3 Project Data Compilation

The analytical laboratory generated an Adobe Acrobat® portable document format (PDF) file of

the analytical data packages, as well as an electronic database deliverable. The electronic

database was checked against the PDF file provided by the laboratory and updated as required,

based on data qualifier flags applied during data validation. Data generated during

implementation of the sampling and analysis plan were incorporated into the MRC

environmental geographic information system (GIS) database. All data (such as units of measure

and chemical nomenclature) were checked to maintain consistency with the project database.

3.14.4 Geographical Information System

The data management system for this effort consists of a relational database and GIS to manage

environmental information pertaining to MRC. The relational database stores chemical,

geological, hydrogeological, and other environmental data collected for the MRC environmental

investigations. The GIS is built from the relational database and contains subsets of the larger

data pool. Using the GIS, environmental data were posted onto base maps to represent the

information graphically for this report.

TABLE 3-5

LIST OF BLOCK E SAMPLES AND CHEMICAL ANALYSES, JUNE-JULY 2012

LOCKHEED MARTIN MIDDLE RIVER COMPLEX, MIDDLE RIVER, MARYLAND

PAGE 1 OF 8

Boring

Number Sample ID

Sample Date

(yyyymmdd)

PCBs

(USEPA

8082A)

PAHs

(USEPA

8270C)

Metals

(USEPA

6010C)

Mercury

(USEPA

7471B)

Hexavalent

chromium

(USEPA

7196A)

VOCS

(USEPA

8260B)

TPH-

DRO/GRO

(USEPA

8015B)

Asbestos

(USEPA

600/R-93/116

and 600/M4-

82-020)

Radiological

(MOD HASL-

300)

E-SB-BCK-1 E-SB-BCK-RAD-1 20120627 XE-SB-BCK-2 E-SB-BCK-RAD-2 20120627 XE-SB-BCK-3 E-SB-BCK-RAD-3 20120627 XE-SB-921 E-SB-921-CS-0-0.25 20120626 XE-SB-922 E-SB-922-CS-0-0.33 20120626 XE-SB-923 E-SB-923-CS-0-0.33 20120626 XE-SB-924 E-SB-924-CS-0-0.25 20120625 XE-SB-924 E-SB-924-CS-0-0.25-RAD 20120626 XE-SB-925 E-SB-925-CS-0-0.25 20120625 XE-SB-925 E-SB-925-CS-0-0.25-RAD 20120626 XE-SB-926 E-SB-926-CS-0-0.25-RAD 20120626 XE-SB-926 E-SB-926-CS-0-0.42 20120625 XE-SB-927 E-SB-927-CS-0-0.25 20120626 XE-SB-928 E-SB-928-CS-0-0.33 20120626 XE-SB-929 E-SB-929-CS-0-0.33 20120626 XE-SB-930 E-SB-930-CS-0-0.42 20120626 XE-SB-930 E-SB-930-CS-0-0.42-RAD 20120626 XE-SB-931 E-SB-931-CS-0-0.33 20120626 XE-SB-932 E-SB-932-CS-0-0.25 20120626 XE-SB-933 E-SB-933-CS-0-0.42 20120626 XE-SB-933 E-SB-933-CS-0-0.42-RAD 20120626 XE-SB-934 E-SB-934-CS-0-0.42 20120627 X XE-SB-935 E-SB-935-CS-0-0.33 20120626 XE-SB-935 E-SB-935-CS-0-0.33-RAD 20120626 XE-SB-936 E-SB-936-CS-0-0.25 20120626 XE-SB-936 E-SB-936-CS-0-0.25-RAD 20120626 XE-SB-937 E-SB-937-CS-0-0.25 20120625 XE-SB-937 E-SB-937-CS-0-0.25-RAD 20120626 XE-SB-938 E-SB-938-CS-0-0.17 20120625 XE-SB-938 E-SB-938-CS-0-0.17-RAD 20120626 XE-SB-939 E-SB-939-CS-0-0.33 20120626 XE-SB-939 E-SB-939-CS-0-0.33-RAD 20120626 XE-SB-940 E-SB-940-CS-0-0.33 20120626 XE-SB-940 E-SB-940-CS-0-0.33-RAD 20120626 XE-SB-941 E-SB-941-CS-0-0.25 20120625 XE-SB-941 E-SB-941-CS-0-0.25-RAD 20120626 XE-SB-942 E-SB-942-CS-0-0.33 20120625 XE-SB-942 E-SB-942-CS-0-0.33-RAD 20120626 XE-SB-943 E-SB-943-CS-0-0.25 20120626 XE-SB-943 E-SB-943-CS-0-0.25-RAD 20120626 XE-SB-944 E-SB-944-CS-0-0.5 20120627 X X

CONCRETE SAMPLES

TABLE 3-5



PAGE 2 OF 8

Boring

Number Sample ID

Sample Date

(yyyymmdd)

PCBs

(USEPA

8082A)

PAHs

(USEPA

8270C)

Metals

(USEPA

6010C)

Mercury

(USEPA

7471B)

Hexavalent

chromium

(USEPA

7196A)

VOCS

(USEPA

8260B)

TPH-

DRO/GRO

(USEPA

8015B)

Asbestos

(USEPA

600/R-93/116

and 600/M4-

82-020)

Radiological

(MOD HASL-

300)

E-SB-945 E-SB-945-CS-0-0.5 20120628 XE-SB-946 E-SB-946-CS-0-0.33 20120626 XE-SB-946 E-SB-946-CS-0-0.33-RAD 20120626 XE-SB-947 E-SB-947-CS-0-0.25 20120626 XE-SB-947 E-SB-947-CS-0-0.25-RAD 20120626 XE-SB-948 E-SB-948-CS-0-0.25 20120625 XE-SB-948 E-SB-948-CS-0-0.25-RAD 20120626 XE-SB-949 E-SB-949-CS-0-0.5 20120627 X XE-SB-950 E-SB-950-CS-0-0.5 20120627 X XE-SB-951 E-SB-951-CS-0-0.33 20120626 XE-SB-951 E-SB-951-CS-0-0.33-RAD 20120626 XE-SB-952 E-SB-952-CS-0-0.33 20120625 XE-SB-952 E-SB-952-CS-0-0.33-RAD 20120626 XE-SB-953 E-SB-953-CS-0-0.42 20120627 X XE-SB-954 E-SB-954-CS-0-0.25 20120625 XE-SB-954 E-SB-954-CS-0-0.25-RAD 20120626 XE-SB-961 E-SB-961-CS-0-0.5 20120627 X XE-SB-962 E-SB-962-CS-0-0.42 20120628 XE-SB-963 E-SB-963-CS-0-0.5 20120627 XE-SB-969 E-SB-969-CS-0-0.5 20120627 XE-SB-970 E-SB-970-CS-0-0.5 20120627 XE-SB-971 E-SB-971-CS-0-0.5 20120627 XTotal 40 6 23

D-SB-887 D-SB-887-BCK-RAD 20120629 X

D-SB-888 D-SB-888-BCK-RAD 20120629 X

D-SB-889 D-SB-889-BCK-RAD 20120629 X

D-SB-890 D-SB-890-BCK-RAD 20120629 X

D-SB-891 D-SB-891-BCK-RAD 20120629 X

D-SB-892 D-SB-892-BCK-RAD 20120629 X

D-SB-893 D-SB-893-BCK-RAD 20120629 X

E-SB-955 E-SB-955-0-0.5 20120629 X XE-SB-955 E-SB-955-0.5-2 20120629 X XE-SB-955 E-SB-955-0.5-2-RAD 20120629 XE-SB-955 E-SB-955-2-3 20120629 X XE-SB-955 E-SB-955-2-3-RAD 20120629 XE-SB-955 E-SB-955-3-4 20120629 X XE-SB-956 E-SB-956-0-0.5 20120628 X XE-SB-956 E-SB-956-0.5-2 20120628 X XE-SB-956 E-SB-956-2-3 20120628 X XE-SB-956 E-SB-956-3-4 20120628 X X

SHALLOW PERIPHERAL SOIL BORING SAMPLES(1)

TABLE 3-5



PAGE 3 OF 8

Boring

Number Sample ID

Sample Date

(yyyymmdd)

PCBs

(USEPA

8082A)

PAHs

(USEPA

8270C)

Metals

(USEPA

6010C)

Mercury

(USEPA

7471B)

Hexavalent

chromium

(USEPA

7196A)

VOCS

(USEPA

8260B)

TPH-

DRO/GRO

(USEPA

8015B)

Asbestos

(USEPA

600/R-93/116

and 600/M4-

82-020)

Radiological

(MOD HASL-

300)

E-SB-957 E-SB-957-0-0.5 20120628 X XE-SB-957 E-SB-957-0.5-2 20120628 X XE-SB-957 E-SB-957-2-3 20120628 X XE-SB-957 E-SB-957-3-4 20120628 X XE-SB-958 E-SB-958-0-0.5 20120628 X XE-SB-958 E-SB-958-0.5-2 20120628 X XE-SB-958 E-SB-958-0.5-2-RAD 20120628 XE-SB-958 E-SB-958-2-3 20120628 X X X X XE-SB-958 E-SB-958-3-4 20120628 X XE-SB-959 E-SB-959-0-0.5 20120628 X XE-SB-959 E-SB-959-0.5-2 20120628 X XE-SB-959 E-SB-959-2-3 20120628 XE-SB-959 E-SB-959-3-4 20120628 XE-SB-960 E-SB-960-1-2 20120628 X XE-SB-960 E-SB-960-1-2-RAD 20120628 XE-SB-960 E-SB-960-2-3.5 20120628 X XE-SB-961 E-SB-961-1-2 20120628 X XE-SB-961 E-SB-961-1-2-RAD 20120628 XE-SB-961 E-SB-961-2-3 20120628 X XE-SB-961 E-SB-961-2-3-RAD 20120628 XE-SB-962 E-SB-962-1-2 20120628 X XE-SB-962 E-SB-962-1-2-RAD 20120628 XE-SB-962 E-SB-962-2-3 20120628 X X X X XE-SB-963 S-SB-963-0.5-2 20120627 X XE-SB-963 E-SB-963-0.5-2.0-RAD 20120627 XE-SB-963 S-SB-963-2-2.5 20120627 X XE-SB-963 E-SB-963-2-2.5-RAD 20120627 XE-SB-964 S-SB-964-0-0.5 20120627 X XE-SB-964 S-SB-964-0.5-2 20120627 X XE-SB-964 E-SB-964-1.5-2.0-RAD 20120627 XE-SB-964 S-SB-964-2-3 20120627 XE-SB-964 S-SB-964-3-4 20120627 XE-SB-965 E-SB-965-0-0.5 20120627 X XE-SB-965 E-SB-965-0.5-2 20120627 X XE-SB-965 E-SB-965-0.5-2.0-RAD 20120627 XE-SB-965 S-SB-965-2-3 20120627 XE-SB-966 E-SB-966-0-0.5 20120627 X X X X XE-SB-966 E-SB-966-0-1-RAD 20120627 XE-SB-966 E-SB-966-0.5-2 20120627 X XE-SB-966 E-SB-966-2-3 20120627 X X X XE-SB-967 E-SB-967-0-0.5 20120627 X XE-SB-967 E-SB-967-0.5-2 20120627 X X

TABLE 3-5



PAGE 4 OF 8

Boring

Number Sample ID

Sample Date

(yyyymmdd)

PCBs

(USEPA

8082A)

PAHs

(USEPA

8270C)

Metals

(USEPA

6010C)

Mercury

(USEPA

7471B)

Hexavalent

chromium

(USEPA

7196A)

VOCS

(USEPA

8260B)

TPH-

DRO/GRO

(USEPA

8015B)

Asbestos

(USEPA

600/R-93/116

and 600/M4-

82-020)

Radiological

(MOD HASL-

300)

E-SB-967 E-SB-967-0.5-2.0-RAD 20120627 XE-SB-968 E-SB-968-0-0.5 20120627 X XE-SB-968 E-SB-968-0.5-2 20120627 X XE-SB-968 E-SB-968-0.5-2.0-RAD 20120627 XE-SB-968 E-SB-968-2-3 20120627 XE-SB-968 E-SB-968-3-4 20120627 XE-SB-968 E-SB-968-3-4-RAD 20120627 XE-SB-969 E-SB-969-0.5-2 20120627 X XE-SB-969 E-SB-969-0-5-2.0-RAD 20120627 XE-SB-969 E-SB-969-2-3 20120627 X XE-SB-969 E-SB-969-3-4-RAD 20120627 XE-SB-970 E-SB-970-0.5-2 20120627 X XE-SB-970 E-SB-970-1.5-2.0-RAD 20120627 XE-SB-970 E-SB-970-2-3 20120627 X XE-SB-971 E-SB-971-0.5-2 20120627 X XE-SB-971 E-SB-971-0.5-2.0-RAD 20120627 XE-SB-971 E-SB-971-2-3 20120627 X X X X XE-SB-972 E-SB-972-0-0.5 20120629 X XE-SB-972 E-SB-972-0.5-2 20120629 X XE-SB-972 E-SB-972-0.5-2-RAD 20120629 XE-SB-972 E-SB-972-2-3 20120629 X XE-SB-972 E-SB-972-2-3-RAD 20120629 XE-SB-972 E-SB-972-3-4 20120629 X XE-SB-973 E-SB-973-0-0.5 20120629 X XE-SB-973 E-SB-973-0.5-2 20120629 X XE-SB-973 E-SB-973-0.5-2-RAD 20120629 XE-SB-973 E-SB-973-2-3 20120629 X XE-SB-973 E-SB-973-2-3-RAD 20120629 XE-SB-973 E-SB-973-3-4 20120629 X XE-SB-974 E-SB-974-0-0.5 20120629 X XE-SB-974 E-SB-974-0.5-2 20120629 X XE-SB-974 E-SB-974-0.5-2-RAD 20120629 XE-SB-974 E-SB-974-2-3 20120629 X XE-SB-974 E-SB-974-2-3-RAD 20120629 XE-SB-974 E-SB-974-3-4 20120629 X XE-SB-975 E-SB-975-0-0.5 20120629 X XE-SB-975 E-SB-975-0.5-2 20120629 X XE-SB-975 E-SB-975-0.5-2-RAD 20120629 XE-SB-975 E-SB-975-2-3 20120629 X XE-SB-975 E-SB-975-3-4 20120629 X XE-SB-976 E-SB-976-0-0.5 20120629 X X X X XE-SB-976 E-SB-976-0.5-2 20120629 X X

TABLE 3-5



PAGE 5 OF 8

Boring

Number Sample ID

Sample Date

(yyyymmdd)

PCBs

(USEPA

8082A)

PAHs

(USEPA

8270C)

Metals

(USEPA

6010C)

Mercury

(USEPA

7471B)

Hexavalent

chromium

(USEPA

7196A)

VOCS

(USEPA

8260B)

TPH-

DRO/GRO

(USEPA

8015B)

Asbestos

(USEPA

600/R-93/116

and 600/M4-

82-020)

Radiological

(MOD HASL-

300)

E-SB-976 E-SB-976-0.5-2-RAD 20120629 XE-SB-976 E-SB-976-2-3 20120629 X XE-SB-976 E-SB-976-2-3-RAD 20120629 XE-SB-976 E-SB-976-3-4 20120629 X X X X XE-SB-977 E-SB-977-0-0.5 20120629 X XE-SB-977 E-SB-977-0.5-2 20120629 X XE-SB-977 E-SB-977-0.5-2-RAD 20120629 XE-SB-977 E-SB-977-2-3 20120629 X XE-SB-977 E-SB-977-3-4 20120629 X XE-SB-978 E-SB-978-0-0.5 20120629 X XE-SB-978 E-SB-978-0.5-2 20120629 X XE-SB-978 E-SB-978-0.5-2-RAD 20120629 XE-SB-978 E-SB-978-2-2.5 20120629 X XE-SB-979 E-SB-979-0-0.5 20120628 X XE-SB-979 E-SB-979-0.5-2 20120628 X XE-SB-979 E-SB-979-0.5-2-RAD 20120628 XE-SB-979 E-SB-979-2-3 20120628 X XE-SB-979 E-SB-979-3-4 20120628 X XE-SB-980 E-SB-980-0-0.5 20120628 X XE-SB-980 E-SB-980-0.5-2 20120628 X XE-SB-980 E-SB-980-0.5-2-RAD 20120628 XE-SB-980 E-SB-980-2-3 20120628 X XE-SB-980 E-SB-980-3-4 20120628 X XE-SB-981 E-SB-981-0-0.5 20120628 X XE-SB-981 E-SB-981-0.5-2 20120628 X XE-SB-981 E-SB-981-0.5-2-RAD 20120628 XE-SB-981 E-SB-981-2-3 20120628 X XE-SB-981 E-SB-981-2-3-RAD 20120628 XE-SB-981 E-SB-981-3-3.5 20120628 X XE-SB-982 E-SB-982-0-0.5 20120628 X XE-SB-982 E-SB-982-0.5-2 20120628 X XE-SB-982 E-SB-982-0.5-2-RAD 20120628 XE-SB-982 E-SB-982-2-3 20120628 X XE-SB-982 E-SB-982-3-4 20120628 X X

DEEP SOIL BORING SAMPLESE-CB-2 E-CB-2-0-2 20120719 X XE-CB-2 E-CB-2-0-2-RAD 20120719 XE-CB-2 E-CB-2-2-4 20120719 X XE-CB-2 E-CB-2-2-4-RAD 20120719 XE-CB-2 E-CB-2-4-6 20120719 X XE-CB-2 E-CB-2-6-8 20120719 X XE-CB-2 E-CB-2-8-10 20120719 X X

TABLE 3-5



PAGE 6 OF 8

Boring

Number Sample ID

Sample Date

(yyyymmdd)

PCBs

(USEPA

8082A)

PAHs

(USEPA

8270C)

Metals

(USEPA

6010C)

Mercury

(USEPA

7471B)

Hexavalent

chromium

(USEPA

7196A)

VOCS

(USEPA

8260B)

TPH-

DRO/GRO

(USEPA

8015B)

Asbestos

(USEPA

600/R-93/116

and 600/M4-

82-020)

Radiological

(MOD HASL-

300)

E-CB-2 E-CB-2-10-12 20120719 X XE-CB-2 E-CB-2-12-14 20120719 X X X X X XE-CB-2 E-CB-2-16-18 20120719 XE-CB-2 E-CB-2-22-24 20120719 XE-CB-2 E-CB-2-26-28 20120719 X X X X X XE-CB-2 E-CB-2-28-30 20120719 XE-CB-2 E-CB-2-32-34 20120719 XE-CB-2 E-CB-2-36-38 20120719 XE-CB-2 E-CB-2-38-40 20120719 X X X X X XE-CB-2 E-CB-2-42-44 20120719 XE-CB-2 E-CB-2-46-48 20120719 XE-CB-2 E-CB-2-48-50 20120719 X X X X X XE-CB-11A E-CB-11A-0-2 20120720 X XE-CB-11A E-CB-11A-0-2-RAD 20120720 XE-CB-11A E-CB-11A-2-4 20120720 X XE-CB-11A E-CB-11A-2-4-RAD 20120720 XE-CB-11A E-CB-11A-4-6 20120720 X XE-CB-11A E-CB-11A-6-8 20120720 X XE-CB-11A E-CB-11A-8-10 20120720 X XE-CB-11A E-CB-11A-10-12 20120720 X X X X X XE-CB-11A E-CB-11A-12-14 20120720 XE-CB-11A E-CB-11A-16-18 20120720 XE-CB-11A E-CB-11A-18-20 20120720 X X X X X XE-CB-11A E-CB-11A-22-24 20120720 XE-CB-11A E-CB-11A-26-28 20120720 XE-CB-11A E-CB-11A-32-34 20120720 XE-CB-11A E-CB-11A-36-38 20120720 X X X X X XE-CB-11A E-CB-11A-38-40 20120720 XE-CB-11A E-CB-11A-42-44 20120720 XE-CB-11A E-CB-11A-46-48 20120720 X X X X X XE-CB-11A E-CB-11A-48-50 20120720 XE-CB-11B E-CB-11B-0-2 20120719 XE-CB-11B E-CB-11B-0-2-RAD 20120719 XE-CB-11B E-CB-11B-2-4 20120719 XE-CB-11B E-CB-11B-2-4-RAD 20120719 XE-CB-11B E-CB-11B-4-6 20120719 XE-CB-11B E-CB-11B-6-8 20120719 X X X X X XE-CB-11B E-CB-11B-8-10 20120719 XE-CB-11B E-CB-11B-12-14 20120719 XE-CB-11B E-CB-11B-16-18 20120719 X X X X X XE-CB-11B E-CB-11B-18-20 20120719 XE-CB-11B E-CB-11B-22-24 20120719 X

TABLE 3-5



PAGE 7 OF 8

Boring

Number Sample ID

Sample Date

(yyyymmdd)

PCBs

(USEPA

8082A)

PAHs

(USEPA

8270C)

Metals

(USEPA

6010C)

Mercury

(USEPA

7471B)

Hexavalent

chromium

(USEPA

7196A)

VOCS

(USEPA

8260B)

TPH-

DRO/GRO

(USEPA

8015B)

Asbestos

(USEPA

600/R-93/116

and 600/M4-

82-020)

Radiological

(MOD HASL-

300)

E-CB-11B E-CB-11B-26-28 20120719 XE-CB-11B E-CB-11B-28-30 20120719 X X X X X XE-CB-11B E-CB-11B-32-34 20120719 XE-CB-11B E-CB-11B-36-38 20120719 XE-CB-11B E-CB-11B-38-40 20120719 X X X X X XE-CB-13 E-CB-13-0-2 20120720 X XE-CB-13 E-CB-13-0-2-RAD 20120720 XE-CB-13 E-CB-13-2-4 20120720 X XE-CB-13 E-CB-13-2-4-RAD 20120720 XE-CB-13 E-CB-13-4-6 20120720 X XE-CB-13 E-CB-13-6-8 20120720 X XE-CB-13 E-CB-13-8-10 20120720 X XE-CB-13 E-CB-13-10-12 20120720 X X X X X XE-CB-13 E-CB-13-14-16 20120720 XE-CB-13 E-CB-13-18-20 20120720 XE-CB-13 E-CB-13-22-24 20120720 X X X X X XE-CB-13 E-CB-13-24-26 20120720 XE-CB-13 E-CB-13-28-30 20120720 XE-CB-13 E-CB-13-32-34 20120720 XE-CB-13 E-CB-13-36-38 20120720 X X X X X XE-CB-13 E-CB-13-38-40 20120720 XE-CB-13 E-CB-13-40-42 20120720 XE-CB-13 E-CB-13-42-44 20120720 XE-CB-13 E-CB-13-44-46 20120720 X X X X X XE-SB-983 E-SB-983-0-2 20120719 X X XE-SB-983 E-SB-983-0-2-RAD 20120719 XE-SB-983 E-SB-983-2-4 20120719 X XE-SB-983 E-SB-983-2-4-RAD 20120719 XE-SB-983 E-SB-983-4-6 20120719 X XE-SB-983 E-SB-983-6-8 20120719 X XE-SB-983 E-SB-983-8-10 20120719 X XE-SB-983 E-SB-983-10-12 20120719 XE-SB-983 E-SB-983-12-14 20120719 XE-SB-983 E-SB-983-14-16 20120719 XE-SB-983 E-SB-983-16-18 20120719 XE-SB-983 E-SB-983-18-20 20120719 XE-SB-983 E-SB-983-22-24 20120719 XE-SB-983 E-SB-983-26-28 20120719 XE-SB-983 E-SB-983-32-34 20120719 XE-SB-983 E-SB-983-36-38 20120719 XE-SB-984 E-SB-984-0-2 20120724 X XE-SB-984 E-SB-984-0-2-RAD 20120724 X

TABLE 3-5



PAGE 8 OF 8

Boring

Number Sample ID

Sample Date

(yyyymmdd)

PCBs

(USEPA

8082A)

PAHs

(USEPA

8270C)

Metals

(USEPA

6010C)

Mercury

(USEPA

7471B)

Hexavalent

chromium

(USEPA

7196A)

VOCS

(USEPA

8260B)

TPH-

DRO/GRO

(USEPA

8015B)

Asbestos

(USEPA

600/R-93/116

and 600/M4-

82-020)

Radiological

(MOD HASL-

300)

E-SB-984 E-SB-984-2-4 20120724 X XE-SB-984 E-SB-984-2-4-RAD 20120724 X

E-SB-984 E-SB-984-4-6 20120724 X X X XE-SB-984 E-SB-984-6-8 20120724 X XE-SB-984 E-SB-984-8-10 20120724 X XE-SB-984 E-SB-984-10-12 20120724 X X X XE-SB-984 E-SB-984-12-14 20120724 XE-SB-984 E-SB-984-14-16 20120724 XE-SB-984 E-SB-984-16-18 20120724 XE-SB-984 E-SB-984-18-20 20120724 XE-SB-984 E-SB-984-22-24 20120724 XE-SB-984 E-SB-984-26-28 20120724 XE-SB-984 E-SB-984-32-34 20120724 XE-SB-984 E-SB-984-36-38 20120724 XTotal 178 135 23 23 7 20 18 0 54

1 Samples were also collected at depths of 3-4 feet at E-SB-961, E-SB-962, E-SB-969 and E-SB-971 and 3-3.5 feet at E-SB-970, but were not analyzedin accordance with the work plan because the analyte concentrations for the above sample were less than the project screening levels.

CB - confirmation boring PAHs - polycyclic aromatic hydrocarbons TPH - total petroleum hydrocarbonsCS - concrete sample PCBs - polychlorinated biphenyls USEPA - U.S. Environmental Protection AgencyDRO - diesel-range organics RAD - radiological yyyymmdd - year month dayGRO - gasoline-range organics SB - soil boring

This page intentionally left blank.


Section 4

Results

The following section presents the results of the June–July 2012 Block E additional soil

investigation. The study includes a geophysical survey of the southeastern portion of Block E to

identify potential subsurface geophysical anomalies and features, and additional concrete, soil

and groundwater sampling and chemical analyses. The results of these investigation tasks are

described in the following sections.

4.1 GEOPHYSICAL SURVEY

This section summarizes the finding of the electrical resistivity imaging (ERI) study. A full report

detailing the findings of the ERI survey is in Appendix C. The survey confirms the presence of a

metallic water pipeline running through the study site. The electrical signal for the structure is

indicated as purple-shaded conductive anomalies in several transections. The pipeline is shown

running from the southwestern corner to the northeastern boundary of the survey area in a line

parallel to survey lines MID-4, MID-5, and MID-6. Building footers and, with one exception,

significant sub-slab voids were not detected when advancing stainless-steel electrodes below the

slab or in the ERI data.

Small voids ranging from approximately two to six inches deep were detected at several

locations when the steel probes were advanced below the concrete slabs. A nine-foot deep void

was detected after advancing a 10-foot long steel rod in the area shown in historical drawings as

an elevator location. Vertical high-conductivity signatures indicate possible locations of pilings

in the survey area. A review of historical building structural drawings shows building footers at

depths ranging from 4.5 to 5.2 feet below grade in the survey area; deeper pilings were installed

north and east of the survey area. Strong and consistent correlations between resistivity readings

and lithology are not apparent in the ERI results.

Four soil borings CB-2, CB-11A, CB-11B, and CB-13 were advanced in areas of ERI anomalies.

Soil samples were collected continuously to depths of 40 to 50 feet using RotoSonic drilling


methods. The potential presence of ERI anomalies (i.e., subsurface areas of either high

conductivity or high resistivity) led to collection of soil samples for chemical analyses to provide

soil-chemical data to be evaluated along with the occurrence of the ERI anomalies. CB-2 and

CB-11A were advanced in areas of high resistivity and CB-11B and CB-13 were advanced in

areas of high conductivity. Only low concentrations of target analytes were detected in these

borings, at limited depth.

Low concentrations of polycyclic aromatic hydrocarbons (PAHs) (resistive constituents) were

detected in shallow soil samples collected from CB-2 (0–2 feet), CB-11A (4–12 feet), and CB-13

(4–6 feet). Slightly elevated concentrations of several metals (conductive constituents) were

detected in shallow and intermediate-depth soil samples at CB-11B (6–8 feet) and CB-11A

(18–20 feet) (see Tables 4-7 and 4-8 and discussions below). At SB-984, contaminant

concentrations above regulatory standards are coincident with resistive anomalies detected in this

area. Elsewhere, strong correlations between chemical constituents (e.g., PCBs, PAHs, or metals)

and high conductivity or high resistivity could not be established with the ERI survey.

4.2 GROUNDWATER LEVELS

Groundwater levels and elevations and measured field parameters for the study are in Table 4-1.

Groundwater elevations obtained from the groundwater level measurements were plotted to

provide a groundwater-elevation contour map in Figure 4-1. Groundwater elevations are shown

for the upper surficial aquifer “A” wells in Block E. Figure 4-1 shows that during the period of

the ERI survey, groundwater flow was from the area of higher groundwater elevations in the

northwest to Dark Head Cove to the southeast.

4.3 CONCRETE, SOIL, AND GROUNDWATER SAMPLING,JUNE–JULY 2012

This investigation primarily sought to further characterize polychlorinated biphenyls (PCBs) and

PAHs in soil at the southwestern portion and the periphery of Block E, and to provide data for

other chemicals to update a risk assessment. Two-hundred-eighteen concrete and soil samples

were analyzed for PCBs and 135 soil samples were analyzed for PAHs. Selected samples were

also analyzed for volatile organic compounds (VOCs), total petroleum hydrocarbons

(TPH)-gasoline range organics (GRO), TPH-diesel range organics (DRO), metals (including


hexavalent chromium [CrVI]) in soils, and six concrete samples were analyzed for asbestos.

Samples analyzed for radiological parameters are discussed in Appendix A. As discussed in

Section 3, the analytical results from the laboratory underwent Level IV data-validation

procedures in accordance with U.S. Environmental Protection Agency (USEPA) Region 3

protocols to ensure that the laboratory data generated are valid and adequate for the project

objectives.

This section presents the results of the chemical analyses of site concrete, soil, and a single

groundwater sample relative to human health risk-based screening standards. Human health

screening was completed for this investigation because human health risks are considered the

primary drivers for implementing additional studies and remedial actions. The screening is

intended to gauge the degree of observed soil and groundwater impacts in relation to regulatory

standards and potential adverse effects on human health or the environment, and to evaluate the

need for further sampling or remedial action. Therefore, regulatory risk-based standards are used

whenever possible.

Residential standards are used to provide a relative evaluation for hypothetical future property

use. Non-residential or industrial screening of the results was conducted because the site is

restricted and the facility is likely to remain an industrial or commercial property for the

indefinite future. Therefore, non-residential or industrial standards are considered more

applicable for current and likely future uses of the property.

USEPA recommends PCB remediation goals of one milligram per kilogram (mg/kg)

concentration for residential land use, and 10–25 mg/kg concentration for industrial land use

(USEPA, 1990). Therefore, the recommended PCB residential remediation goal of 1 mg/kg and

industrial goal of 10 mg/kg were selected as PCB screening-criteria for this investigation. The

Block E human-health risk assessment (HHRA) formulated preliminary remediation goals for

PAHs as benzo(a)pyrene equivalents (BaPEq) (Tetra Tech, 2012a). The BaPEq residential

remediation goal is 0.140 mg/kg and its industrial remediation goal of 2.90 mg/kg were

developed as part of the HHRA (Tetra Tech, 2012a; Table 6-2) and subsequently selected as

BaPEq screening-criteria for this investigation. Site-specific background levels for the Middle

River Complex (MRC) were also developed for arsenic (12 mg/kg) and vanadium (91 mg/kg) in

soil in a subsequent response action plan for Block B soil (Tetra Tech, 2010). These two site-


specific background concentrations were approved for the MRC by Maryland Department of the

Environment (MDE) These background concentrations are used as residential and

non-residential screening criteria for this study.

For other constituents, MDE chemical-specific soil and groundwater standards (MDE, 2008)

were used to evaluate concentrations of constituents detected in soil and groundwater. MDE uses

these standards to screen sites, and they are useful benchmarks for evaluating site data and

potential cleanup goals. For soil, the results of the field investigation were compared to MDE

residential and non-residential land use standards for constituents without site-specific

remediation goals discussed previously.

Two types of tables summarizing the chemical analytical results are in the following sections. In

the first table, statistical summaries detail the number of detections, minimum and maximum

concentrations, and average concentrations for each analyte detected. The second table is a

complete list of concentrations detected in soil with data validation qualifiers for the samples

collected during this investigation. Shaded cells in these second tables represent constituents for

which concentrations exceed the screening level. Data tables presenting all sampling analytical

results, along with laboratory reporting limits or method-detection limits, are in Appendix H. The

asbestos analyses report is also in Appendix H. Data validation reports are in Appendix F.

4.3.1 Concrete Samples

Analytical results for the 40 concrete samples collected at Block E in June 2012 are in Tables 4-2

and 4-3 and in Figure 4-2. The tables and figure show that PCBs were detected at 23 sampling

locations with detected concentrations of total PCBs (t-PCBs) ranging from 0.021 mg/kg at

E-SB-962 (along the eastern boundary of Block E) to 12 mg/kg at E-SB-947 (in the west–central

part of the former Building D concrete slabs). Of the 23 detections, only three sampling locations

exceed the screening level of 1 mg/kg.

The three sampling locations exceeding the screening level are E-SB-947 (12 mg/kg), E-SB-942

(5.8 mg/kg), and E-SB-938 (1.2 mg/kg). Borings E-SB-942 and E-938 are along the southern

edge of the concrete slabs in the areas of the former finishing department (E-SB-942) and former

transformer room (E-SB-938). The t-PCB concentration at boring E-932 (0.97 mg/kg), in the

tractor-trailer storage area, is slightly below the screening level of 1 mg/kg. Aroclor-1260 is the


primary PCB detected in the 2012 samples; Aroclor-1248 was detected in only one sample

(E-SB-948).

Except for the area of boring E-SB-947 (in the west–central portion of the concrete slabs), these

results confirm previous findings that PCB concentrations exceed the screening level primarily

along the southern edge of the concrete. In the eastern and northern portions of the slabs, PCB

concentrations are generally below the residential standard of 1 mg/kg.

Sampling results at borings E-SB-933, E-SB-934, E-SB-935, E-SB-939, and E-SB-943 also

provide boundaries of PCB concentrations that are less than the screening level to the east and

west of where elevated PCBs levels were detected in concrete at borings E-SB-833, E-SB-833E,

and E-SB-833K, in the southwestern portion of the concrete slabs.

Concrete samples from borings E-SB-934, E-SB-944, E-SB-949, E-SB-950, E-SB-953, and

E-SB-961 were also analyzed for asbestos. Asbestos was not detected in any of these samples.

(See the asbestos report in Appendix H).

4.3.2 Peripheral Soil Samples

Soil samples were collected from 28 shallow soil borings (E-SB-955 through E-SB-982) to

maximum depths of 2.5 to four feet below grade. As mentioned in Section 3, deeper samples at

the shallow soil borings were analyzed for PCBs and PAHs only if the upper sample result did

not exceed the residential screening levels for those analytes. Therefore, the actual number of

samples analyzed may vary from those actually collected in the field (as shown in Table 3-2) to

those analyzed (Tables 3-4 and 3-5). The following sections briefly discuss the PCB, PAHs,

TPH-GRO, TPH-DRO, and metals results for the 2012 peripheral soil samples. Statistical

summaries of detected concentrations in the peripheral soil samples are in Table 4-4; detected

concentrations are in Table 4-5.

4.3.2.1 Polychlorinated Biphenyls

Eighty-five soil samples from 28 peripheral soil borings were analyzed for PCBs by the

laboratory. PCBs were detected in 48 of 85 samples: Aroclor-1260 was detected in 47 samples

(one of the 47 samples also contained Aroclor-1248), and Aroclor-1242 was detected in one

sample. Aroclor-PCB concentrations range from 0.020 mg/kg at sampling location E-SB-977 (at


a depth of two to three feet) to 800 mg/kg at sampling location E-SB-980 (at a depth of zero to

six inches). PCB concentrations exceed the residential screening level of 1 mg/kg in 24 samples,

and exceed the industrial screening level of 10 mg/kg in 14 samples.

Total PCBs detected in soil samples are shown in Figure 4-3. The highest t-PCB concentration

detected in a peripheral soil sample is 800 mg/kg (E-SB-980-0–0.5), collected from a location

adjacent to the former electrical substation and transformer room in the south–central portion of

Block E. The highest t-PCB concentrations detected in the 2012 peripheral soil samples are as

follows:

E-SB-980 (800 mg/kg at 0–0.5 foot) E-SB-957 (39 mg/kg at 0–0.5 foot)

E-SB-981 (720 mg/kg at 0.5–2 feet) E-SB-976 (35 mg/kg at 0–0.5 foot)



E-SB-981 (110 mg/kg at 0–0.5 foot) E-SB-958 (22 mg/kg at 0.5–2 feet)

E-SB-975 (87 mg/kg at 0–0.5 foot) E-SB-978 (16 mg/kg at 0.5–2 feet)

E-SB-979 (55 mg/kg at 0–0.5 foot)

The highest t-PCB concentrations shown above are in shallow soil at depths of 0–0.5 foot and

0.5–2 feet. PCBs were typically not detected below two feet, or if they were detected, their

concentrations were less than the residential screening level. Except for boring E-SB-967, near

the former electrical transformer and heating room in the northwestern portion of Block E, the

2012 results confirm previous findings that t-PCB concentrations are, for the most part, below

the residential screening level in the northern and eastern portions of Block E, and that screening

level exceedances occur in samples collected from the southern edge of the concrete slabs

(borings E-SB-973 through E-SB-982) to the southern boundary of Block E (borings E-SB-955

through E-SB-958).

4.3.2.2 Benzo(a)pyrene Equivalent

Ninety-three soil samples from 28 peripheral soil borings were analyzed for PAHs by the

laboratory. Benzo(a)pyrene equivalent (BaPEq) concentrations were computed for each sample


using the PAH results. PAHs were detected in 63 of 93 samples, in concentrations ranging from

0.0045 mg/kg (E-SB-977-0.5–2) to 45.37 mg/kg (E-SB-974-0–0.5).

BaPEq concentrations exceeding screening levels are shown in Table 4-6 and Figure 4-4. BaPEq

concentrations exceed the residential screening level (0.140 mg/kg) in 30 samples, and exceed

the industrial screening level (2.90 mg/kg) in 12 samples. The highest BaPEq concentration is

45.37 mg/kg at E-SB-974-0-0.5, which is south of the former Building D concrete slabs, between

the former waste disposal area and the concrete pad area used to store Tilley Chemical trailers.

The highest BaPEq concentrations (all of which are industrial screening-level exceedances) and

most of the residential screening-level exceedances are found in shallow soil, at depths of

0–0.5 foot or 0.5 to two feet. Five residential screening-level exceedances were detected in

samples collected below two feet. The 2012 results confirm previous findings that BaPEq

concentrations are, for the most part, below the industrial screening level in the northern and

eastern portions of Block E, and concentrations exceed screening levels from the southern edge

of the concrete slabs (borings E-SB-973 through E-SB-982) to the southern boundary of Block E

(borings E-SB-955 through E-SB-957 and E-SB-959). Exceptions that exceed the industrial

screening level in the northern portion of Block E include surface soil (0–0.5 foot) at borings

E-SB-964, E-SB-965, and E-SB-967, near a former heater room, the former cafeteria, and a

former electrical transformer and heating room.

4.3.2.3 Metals

The laboratory analyzed seven soil samples for metals and CrVI. Eighteen metals, including

CrVI, were detected in at least one sample. However, concentrations of all metals are below

non-residential screening levels, and exceedances of the residential levels occurred infrequently.

Metal concentrations exceed residential screening levels in two samples: E-SB-976-0–0.5 and

E-SB-966-2–3. In E-SB-976-0–0.5, concentrations of antimony, chromium, lead, and mercury

exceed their respective residential screening levels. Antimony at 6.2 mg/kg exceeds its screening

level (3.1 mg/kg) by a factor of two, but chromium, lead, and mercury only exceed their

residential screening levels by 4–30% (e.g., lead at 450 mg/kg, with a residential screening level

of 400 mg/kg, exceeds its residential screening level by 12.5%). Thallium at E-SB-966-2–3

(0.65 mg/kg) slightly exceeds its residential screening level (0.55 mg/kg), but is below its non-

residential screening level (7.2 mg/kg).


4.3.3 Deep Boring Soil Samples

Soil samples were collected from six deep soil borings (E-SB-983, E-SB-984, E-CB-2,

E-CB-11A, E-CB-11B, and E-CB-13) to maximum depths of 50 feet below grade. The following

sections briefly discuss the PCB, PAHs, TPH-GRO, TPH-DRO, and metals results for the 2012

deep-boring soil samples. Statistical summaries of detected concentrations in the deep soil

samples are in Table 4-7; detected concentrations are in Table 4-8.

4.3.3.1 Polychlorinated Biphenyls

The laboratory analyzed 93 soil samples from six soil borings for PCBs. PCBs were detected in

17 samples, 11 of which were from one boring (E-SB-984). Concentrations range from

0.032 mg/kg (E-SB-984-26–28) to 1,700 mg/kg (E-SB-984-4–6). PCB concentrations exceed the

residential screening level (1 mg/kg) in four samples, three of which also exceed the industrial

screening level (10 mg/kg).

Figure 4-3 shows total PCB concentrations in the deep soil samples. This highest t-PCB

concentration for a deep soil sample is 1,700 mg/kg, collected at the 4–6 foot interval at

E-SB-984, which is near a former electrical transformer room in the southwestern portion of

Block E. High PCB concentrations are expected at boring E-SB-984 because it is near previous

soil boring E-SB-853, where high PCB concentrations of 19,000 mg/kg and 780 mg/kg were

detected at depth (8–12 feet and 12–16 feet, respectively). PCB exceedances of the residential

screening level (1 mg/kg) were also detected in E-SB-853 at 24–28.5 feet below grade, at

concentrations ranging from 1.5 to 4.3 mg/kg.

Concentrations of t-PCBs exceeding residential and industrial screening levels in the deep-soil

boring samples are as follows:

E-SB-984 (1,700 mg/kg at 4–6 feet) E-SB-984 (480 mg/kg at 10–12 feet)

E-SB-984 (120 mg/kg at 12–14 feet) E-SB-984 (10 mg/kg at 14–16 feet)

T-PCB concentrations for soil samples collected from 16 to 28 feet at E-SB-984 are less than the

residential screening level (1 mg/kg). PCBs were not detected in E-SB-984 samples collected

below 28 feet, at 32–38 feet below grade. PCBs were either not detected, or were detected at


concentrations (0.034–0.160 mg/kg) below the residential screening level (1 mg/kg) in the

remaining five soil borings (see Figure 4-3).

4.3.3.2 Benzo(a)pyrene Equivalent

PAHs were detected in six of 42 soil samples collected from deep soil borings and analyzed for

PAHs. PAH results were used to calculate BaPEq concentrations (see the human health risk

assessment [Tetra Tech, 2012a] for details on methodology and BaPEq calculation). BaPEq

concentrations range from 0.0066 mg/kg (E-CB-13-4–6) to 0.188 mg/kg (E-SB-983-0–2), and

are as follows:

E-SB-983 (0.188 mg/kg at 0–2 feet)—exceeds residential level of 0.14 mg/kg

E-CB-11A (0.079 mg/kg at 4–6 feet)—below residential level

E-CB-11A (0.020 mg/kg at 8–10 feet)—below residential level

E-SB-983 (0.018 mg/kg at 4–6 feet)—below residential level

E-CB-2 (0.009 mg/kg at 0–2 feet)—below residential level

E-CB-13 (0.007 mg/kg at 4–6 feet)—below residential level

BaPEq concentrations exceeding screening levels in deep boring samples are shown in Table 4-8

and Figure 4-4. BaPEq concentrations do not exceed the industrial screening level of 2.90 mg/kg

in any deep boring sample, and BaPEq exceeds the residential screening level of 0.140 mg/kg in

only one sample (E-SB-983-0–2, 0.188 mg/kg). Boring E-SB-983 is south of former Building D

and adjacent to the former waste disposal area. In this boring, the BaPEq concentration in the

deeper soil sample (4–6 feet) was 0.0184 mg/kg, which is 10 times lower than the 0–2 foot

sample concentration, and well below the residential screening level.

4.3.3.3 Petroleum Hydrocarbons

Eighteen samples were analyzed for TPH-GRO and TPH-DRO. As shown in the Tables 4-7 and

4-8 and Figure 4-5, TPH-GRO was detected in one sample (E-CB-2-12–14) at 12–14 feet and

TPH-DRO was detected in one sample (E-CB-11A-10–12) at 10–12 feet. Both detected TPH

concentrations are less than screening criteria. Nine TPH-DRO sampling results were flagged

with a “B” data qualifier, indicating that TPH-DRO appeared in laboratory control blanks but its


presence in these samples is likely due to laboratory contamination. One TPH-GRO result (sample

E-SB-984-10–12) was flagged with a “UR” qualifier, indicating that it is not considered reliable.

4.3.3.4 Volatile Organic Compounds

Twenty soil samples from the deep borings were analyzed for VOCs. Most VOCs were detected

in shallow soil samples from boring E-SB-984. This boring is in an area near a former electrical

transformer room in the southwestern portion of Block E, and contains PCBs above 100 mg/kg at

four to 14 feet below grade. As shown in Table 4-8, 1,2,3-trichlorobenzene (123-TCB) was

detected at 47,000-micrograms per kilogram (µg/kg) at a depth of 10–12 feet, and at

69,000 µg/kg in the four- to six-foot interval, exceeding its residential screening level

(2,900 µg/kg). 1,2,4-Trichlorobenzene (124-TCB) exceeds both its residential (38,000 µg/kg)

and non-residential (175,000 µg/kg) screening levels with concentrations of 210,000 µg/kg and

310,000 µg/kg at the same depths (10–12 feet and 4–6 feet, respectively). Both TCB

concentrations are approximately 47% higher in the 4–6-foot sample than they are in the

10–12 foot sample.

Lower concentrations of other common Block E VOCs such as dichlorobenzene (DCB) isomers

(200–3,700 µg/kg), tetrachloroethene (530–710 µg/kg), trichloroethene (TCE) (340 µg/kg),

naphthalene (470–770 µg/kg), ethylbenzene (180 µg/kg), and xylenes (260–370 µg/kg) were in

one or both of these samples. Deeper samples collected from boring E-SB-984 were not analyzed

for VOCs because field-screening measurements did not indicate high concentrations of VOCs at

depth. Lower concentrations of the TCB and DCB isomers and TCE were detected in samples

collected from 10–14 feet in boring E-CB-2, located southeast of E-SB-984 and the former waste

disposal area at Block E.

4.3.3.5 Metals

The laboratory analyzed 16 soil samples for metals. Fourteen metals were detected in one or

more samples, and nine of these were detected in all samples. Chromium exceeds its residential

screening level (23 mg/kg) in samples E-CB-11A-18-20 (44 mg/kg) and E-CB-11B-6-8

(24 mg/kg).


4.4 GROUNDWATER SAMPLING

The results for the single groundwater sample collected from boring E-SB-976 are shown in

Table 4-9. VOCs detected in soil samples were also detected in this shallow groundwater sample.

The VOCs 124-TCB, 1,2-dichlorobenzene, 1,3-dichlorobenzene, 1,4-dichlorobenzene (14-DCB),

chlorobenzene, tetrachloroethene, TCE, and trichlorofluoromethane were all detected in this

sample. Fluorodichloromethane was tentatively identified in the sample. Concentrations of

1,3-dichlorobenzene, tetrachloroethene, and TCE exceed Maryland groundwater standards in this

sample.

4.5 POLYCHLORINATED BIPHENYLS

Figure 4-6 presents the PCB results for all concrete and soil samples collected, including the

2012 results. In Figure 4-6, concentrations exceeding the PCB screening level of 1 mg/kg are

represented by yellow, purple, and red for the sample dots. The interior dot represents the result

for the sample collected at greater than or equal to (≥) 0–2 feet below grade, and the outer

concentric rings represent the results for progressively deeper intervals of ≥2–4 feet, ≥4–10 feet,

≥10–20 feet, and >20 feet, respectively. Figure 4-6 shows three main areas where PCB

concentrations in soil exceed the screening level of 1 mg/kg. These areas are (1) the eastern

storm-drain manholes and REC #3—the former 500,000-gallon aboveground storage tank (AST)

and associated tanks; (2) former milling/plating/finishing area and south–central former

transformer room; and (3) the former waste disposal area and southwestern former transformer

room. PCB sampling results for these three areas are discussed in the following sections.

4.5.1 Eastern Storm Drain Manholes and REC #3—Former 500,000-GallonAST and Associated Tanks

PCB exceedances were found in small clusters of samples in the area of two storm-drain

manholes and REC #3 (the former 500,000-gallon AST and associated tanks) (Figure 4-6). The

PCB exceedances are at soil borings SB-521 through SB-528, and SB-570 (adjacent to two

storm-drain manholes), and in the grass field in the area of the former 500,000-gallon fuel AST

and berm at soil borings SB-505, SB-555, SB-841, SB-844, SB-845, SB-888, SB-890, SB-893

through SB-897, SB-957, and SB-958. PCB exceedances in this area are limited to the first

four feet of soil. All surface-soil sampling locations with exceedances have a deeper soil sample

from the same location, indicating that PCB concentrations in deeper soils are less than the


screening criterion of 1 mg/kg (i.e., one or more green rings representing the sampling results

collected at ≥4–10 feet and/or ≥10–20 feet). Figure 4-6 shows that PCB concentrations for

subsurface soil samples at SB-837 and SB-570A are less than the screening level to depths of

30 feet.

4.5.2 Former Milling/Plating/Finishing Area and South–CentralFormer Transformer Room

PCB exceedances were identified in the south–central portion of former Building D in a

rectangular area that includes areas formerly used for milling, plating, and finishing operations

and a former electrical transformer room (Figure 4-6). The area also includes concrete aprons

south of these former operations that include soil borings SB-504, SB-558, SB-839, and SB-956.

This rectangular area, encompassed by soil borings SB-357, SB-364, SB-529, and SB-533, is the

area of the former plating and finishing departments and eastern portion of the former milling

department. SB-501 is in the area of a former electrical transformer room and substation. Two

sampling clusters in this area (samples SB-533 through SB536 and SB-567; SB-529 through

SB-532 and SB-568) are located around two storm-drain manholes currently at the site. Most

PCB exceedances in this area are limited to the first four feet of soil. However, PCB exceedances

were detected in soil 4–10 feet deep at SB-501, SB-502, SB-504, and SB-835 in this area.

4.5.3 Former Waste Disposal Area and Southwestern FormerTransformer Room

PCB exceedances were identified in the western and southwestern portion of Block E. The

exceedances range as far north and east as soil boring SB-353 and as far south and west as soil

boring SB-973. These borings are in the area of the former nuclear laboratory, former electrical

transformer room, and former waste disposal area. In this area, PCB-containing oil was observed

in samples collected from SB-833. SB-833 had a PCB concentration of 24,000 mg/kg, and other

high concentrations of PCBs were detected in samples near SB-833. The high PCB concentration

detected at E-SB-853 (19,000 mg/kg at 8–12 feet) in the area of the former transformer room

indicates that PCB dielectric fluid may have penetrated to a depth of 12 feet. This is supported by

the detection of dichlorobenzenes in prior sampling, and observations of oil and strong odors

during sampling. The high concentration of PCBs in the concrete samples from SB-833F,

SB-833F, and SB-833L also indicates that surface releases may be partially responsible for the

subsurface PCBs.


The results for soil boring E-SB-853 and E-SB-852 indicate that PCBs may extend to a depth of

30 feet below grade in the area of the former electrical transformer room at concentrations

exceeding the residential screening level of 1 mg/kg. However, results from surrounding deep soil

borings (i.e., excluding borings E-SB-853 and E-SB-854) indicate that concentrations above the

residential and industrial screening levels in deep soil are limited. Exceedances are only found in

soil samples collected at depths of 16 feet or less.

At SB-984, northeast of SB-853, PCBs exceed the residential screening level at varying depths

down to a maximum depth of 16 feet (10 mg/kg in the 14–16 foot sample). PCBs were

0.25 mg/kg or less in SB-984 samples collected from 16–28 feet, and were not detected in

samples collected deeper than 28 feet. As shown in Figures 4-9 and 4-14, PCBs at depth at

SB-852/853 have also been bounded to the east by SB-854 and SB-855 and to the west by

CB-11B. SB-852/853 have also been bounded to the south by SB-983 and SB-856, and to the

north by SB-849 and CB-11A and CB-13. These sampling results demonstrate that PCBs at

concentrations exceeding the residential and industrial screening criteria extend into the drainage

area south of the former Building D footprint. However, PCB concentrations associated with the

concrete slab and underlying soil south of this drainage area are less than the screening criterion,

based on previous soil results at SB-564, SB-559, and SB-560, and concrete sampling results at

SB-928, SB-867, SB-930, SB-869, SB-932, SB-923, and SB-922.

4.6 BENZO(A)PYRENE EQUIVALENTS

BaPEq results for all samples collected to date are shown in Figure 4-7. BaPEq concentrations

are plotted in Figure 4-7 using both residential and non-residential risk-based soil

screening-levels developed in the HHRA. The distribution of shallow BaPEq across the site is

similar to that of PCBs, except for the southwestern portion of Block E. Similar to PCBs at

Block E, BaPEq exceedances are found in shallow soil in several samples in the area of a storm

drain at REC #3 (the former 500,000-gallon AST and associated tanks) and in the grass area

adjacent to the 500,000-gallon water AST. BaPEq exceedances also occur in shallow soil beneath

the concrete slab in the area of the former plating and finishing departments and in the eastern

portion of the former milling department.

In many of the samples collected beneath the concrete slabs, PAHs used to calculate BaPEq were

not detected because the detection limits are greater than the residential level of 0.14 mg/kg, and,


in a few instances, greater than the industrial level of 2.9 mg/kg. These samples are shown as

white circles or circles with black hatching in Figure 4-7. BaPEq concentrations in several soil

samples collected in grass areas in the northern and southern peripheries of Building D exceed

the industrial level of 2.90 mg/kg. BaPEq infrequently exceeds the residential and industrial

screening levels in samples collected from beneath the concrete slabs in the former waste

disposal area and former transformer room. BaPEq exceedances in this area are limited to

shallow soil only.

4.7 TOTAL PETROLEUM HYDROCARBONS

TPH results for all samples collected to date are shown in Figure 4-8. TPH concentrations are

plotted using Maryland residential and non-residential soil cleanup standards. Exceedances of

TPH cleanup standards are limited mainly to samples collected (a) beneath the concrete slabs in

the southwestern portion of Block E at the former waste disposal area and former transformer

room (several SB-833-series samples and SB-984), (b) northeast of this area at SB-828,

(c) beneath the concrete slabs in the eastern portion of Block E (SB-905 and SB-906), (d) in

shallow soil at one location at the former 500,000-gallon fuel UST (SB-890), and (e) in shallow

soil at the southern end of the finishing department (SB-503).

TABLE 4-1

GROUNDWATER LEVELS, ELEVATIONS, AND WATER QUALITY MEASUREMENTS, JULY 2012


PAGE 1 OF 2

Depth to Groundwater

Groundwater Elevation

Northing Easting Elevation July 14,2012 July 14,2012

Feet Feet Top of Well Feet Feet

Well ID (NAD 1983) (NAD 1983) (NAVD 1988) (NAVD 1988) (NAVD 1988)

MW-30A 605551.84 1473663.58 11.14 1.40 9.74

MW-31A 605634.11 1473876.50 11.00 3.20 7.80

MW-32A 605705.13 1474065.34 11.01 3.88 7.13

MW-33A 605444.47 1473899.22 11.08 2.68 8.40

MW-34A 605533.40 1474131.14 10.88 4.28 6.60

MW-34B 605527.59 1474062.91 10.84 4.18 6.66

MW-34C 605519.90 1474067.03 10.80 3.62 7.18

MW-36A 605204.23 1474116.35 9.72 6.73 2.99

MW-37A 605266.99 1474222.88 10.50 7.57 2.93

MW-43A 605174.30 1473528.29 11.01 1.57 9.44

MW-44A 605203.70 1473707.56 10.64 1.48 9.16

MW-62A 605294.24 1473425.09 10.62 0.95 9.67

MW-62C 605279.69 1473429.63 10.89 3.22 7.67

MW-72A 605428.64 1474217.52 11.12 6.04 5.08

MW-72B 605412.56 1474225.42 10.79 5.96 4.83

MW-73A 605348.53 1474302.29 10.46 6.8 3.66

MW-73B 605337.69 1474311.02 10.28 6.9 3.38

MW-74A 605307.16 1474202.46 11.18 7.56 3.62

MW-74B 605296.50 1474204.19 10.88 7.7 3.18

MW-74C 605301.41 1474196.58 11.05 8.41 2.64

MW-79B 605705.72 1473649.78 19.14 9.82 9.32

MW-101A 605489.14 1473199.87 27.29 15.68 11.61

MW-101B 605489.30 1473199.83 27.25 16.55 10.70

MW-102A 605633.14 1473506.99 21.63 10.83 10.80

MW-102B 605633.58 1473507.00 21.58 11.74 9.84

PZ-01A 605305.23 1474207.58 11.21 7.76 3.45

PZ-01B 605289.71 1474186.36 11.23 7.91 3.32

TABLE 4-1

GROUNDWATER LEVELS, ELEVATIONS, AND WATER QUALITY MEASUREMENTS, JULY 2012


PAGE 2 OF 2

Item ID pH

Specific

conductance

(µS/cm)

Salinity

(parts per

thousand)

Temperature

(ºC)

Depth to Water

(feet)

MPE-2I 5.18 114.2 0.1 19.9 8.26

MPE-2S 4.95 196.1 0.1 20.2 8.26

MPE-3I 4.97 172.5 0.1 19.8 7.99

MPE-3S 4.97 290.6 0.1 19.8 7.79

MW-101A 4.06 432.8 0.2 23.8 15.68

MW-101B 4.12 173.4 0.1 22.5 16.55

MW-102A 5.35 1045.0 0.5 22.0 10.83

MW-102B 4.41 188.2 0.1 23.4 11.74

MW-30A 6.26 870.0 0.4 30.7 1.40

MW-31A 3.10 184.0 0.1 21.8 3.20

MW-32A 4.56 450.1 0.2 25.9 3.88

MW-33A 3.99 92.3 0.0 25.6 2.68

MW-34A 5.23 356.5 0.2 24.0 4.28

MW-34B 4.65 600.0 0.3 26.5 4.18

MW-34C 8.56 277.5 0.1 27.0 3.62

MW-36A 5.63 0.9 0.0 20.0 6.73

MW-37A 1.87 164.5 0.2 18.6 7.57

MW-43A 5.36 218.5 0.1 31.3 1.57

MW-44A 5.85 1074.0 0.5 26.2 1.48

MW-62A 5.55 390.5 0.2 31.0 0.95

MW-62C 6.97 357.9 0.2 27.3 3.22

MW-72A 5.19 280.4 0.1 20.5 6.04

MW-72B 4.98 126.2 0.1 20.5 5.96

MW-73A 4.60 512.0 0.2 18.1 6.80

MW-73B 4.30 110.4 0.1 18.9 6.90

MW-74A 4.93 363.5 0.2 19.5 7.56

MW-74B 5.00 174.6 0.1 19.8 7.70

MW-74C 5.51 75.5 0.0 19.5 8.41

MW-79B 8.23 4.8 0.0 21.3 9.82

MW-94D 4.36 42.6 0.0 24.7 11.09

PZ-01A 4.64 341.9 0.2 19.8 7.76

PZ-01B 5.35 184.0 0.1 19.9 7.91

IL-14 5.68 994.0 0.5 19.7 4.60

IL-13 5.83 954.0 0.5 22.3 3.42

IL-10 6.55 437.3 0.2 24.6 2.40

CB-1 7.01 238.0 0.1 26.6 2.80

CB-2 N/A N/A N/A N/A 2.70

IL-3/MH-10 6.11 635.0 0.3 25.6 4.44

MH-7 5.86 943.0 0.3 26.2 2.32

MH-7A 6.34 432.0 0.2 26.8 1.90

MH-4 6.04 471.0 0.2 26.7 1.03

IL-18 5.65 425.0 0.2 24.9 2.31

MID-5-33 6.55 260.0 0.1 27.2 1.80

CC-1 6.52 1106.0 0.5 29.1 1.80

CC-2 6.64 374.0 0.2 29.6 1.89CC-3 6.39 4448.0 2.3 29.2 1.85

NAD - North American Datum

NAVD - North American Vertical Datum

uS/cm - microSiemens per centimeteroC - degree Celsius

Water levels and water quality parameters were collected on July 14, 2012.

Inlet/Manhole

Concrete Hole

TABLE 4-2

STATISTICAL SUMMARY OF BLOCK E CONCRETE PCB ANALYSES, JUNE-JULY 2012


Frequency Mininum Maximum Mininum Maximum Sample of Mean of Mean of Standard

Chemical of Detection Non Non Detected Detected Maximum All Positive Deviation

Number Percent Detected Detected Detected Samples Detects

Polychlorinated Biphenyls (mg/kg)

TOTAL AROCLOR 23/40 58 0.013 1.1 0.021 12 E-SB-947-CS-0-0.25 0.543 0.945 2.079

AROCLOR-1260 23/40 58 0.017 0.09 0.021 J 12 E-SB-947-CS-0-0.25 0.545 0.939 2.078

AROCLOR-1248 1/40 3 0.017 0.87 0.13 0.13 E-SB-948-CS-0-0.25 0.028

AROCLOR-1016 0/40 0 0.021 1.1 0.031

AROCLOR-1221 0/40 0 0.016 0.82 0.024

AROCLOR-1232 0/40 0 0.014 0.72 0.021

AROCLOR-1242 0/40 0 0.013 0.67 0.019

AROCLOR-1254 0/40 0 0.017 0.87 0.025

Footnotes:

For non-detects, 1/2 sample quantitation limit was used as a proxy concentration.

1/2 the detection limit was used for B qualified data.

J - estimated concentration

mg/kg - milligrams per kilogram

CS - concrete sample

Associated Samples

E-SB-921-CS-0-0.25 E-SB-931-CS-0-0.33 E-SB-941-CS-0-0.25 E-SB-951-CS-0-0.33

E-SB-922-CS-0-0.33 E-SB-932-CS-0-0.25 E-SB-942-CS-0-0.33 E-SB-952-CS-0-0.33E-SB-923-CS-0-0.33 E-SB-933-CS-0-0.42 E-SB-943-CS-0-0.25 E-SB-953-CS-0-0.42E-SB-924-CS-0-0.25 E-SB-934-CS-0-0.42 E-SB-944-CS-0-0.5 E-SB-954-CS-0-0.25E-SB-925-CS-0-0.25 E-SB-935-CS-0-0.33 E-SB-945-CS-0-0.5 E-SB-961-CS-0-0.5E-SB-926-CS-0-0.42 E-SB-936-CS-0-0.25 E-SB-946-CS-0-0.33 E-SB-962-CS-0-0.42E-SB-927-CS-0-0.25 E-SB-937-CS-0-0.25 E-SB-947-CS-0-0.25 E-SB-963-CS-0-0.5E-SB-928-CS-0-0.33 E-SB-938-CS-0-0.17 E-SB-948-CS-0-0.25 E-SB-969-CS-0-0.5E-SB-929-CS-0-0.33 E-SB-939-CS-0-0.33 E-SB-949-CS-0-0.5 E-SB-970-CS-0-0.5E-SB-930-CS-0-0.42 E-SB-940-CS-0-0.33 E-SB-950-CS-0-0.5 E-SB-971-CS-0-0.5

TABLE 4-3

ANALYTES DETECTED IN BLOCK E CONCRETE SAMPLES, JUNE-JULY 2012


PAGE 1 OF 3

LOCATION

SAMPLE ID

SAMPLE DATE

TOP DEPTH

BOTTOM DEPTH

AROCLOR-1248 1 10 -- -- -- -- --

AROCLOR-1260 1 10 -- -- 0.16 0.41 --

LOCATION

SAMPLE ID

SAMPLE DATE

TOP DEPTH

BOTTOM DEPTH

AROCLOR-1248 1 10 -- -- -- -- --

AROCLOR-1260 1 10 0.28 J -- -- -- 0.22 J

LOCATION

SAMPLE ID

SAMPLE DATE

TOP DEPTH

BOTTOM DEPTH

AROCLOR-1248 1 10 -- -- -- -- --

AROCLOR-1260 1 10 0.66 0.97 -- -- 0.28

20120626 20120626 20120626 20120625 20120625


E-SB-921 E-SB-922 E-SB-923 E-SB-924 E-SB-925

E-SB-921-CS-0-0.25 E-SB-922-CS-0-0.33 E-SB-923-CS-0-0.33 E-SB-924-CS-0-0.25 E-SB-925-CS-0-0.25

0 0 0 0 0

0.25 0.33 0.33 0.25 0.25

E-SB-930

E-SB-930-CS-0-0.42

E-SB-926 E-SB-927 E-SB-928 E-SB-929

E-SB-926-CS-0-0.42 E-SB-927-CS-0-0.25 E-SB-928-CS-0-0.33 E-SB-929-CS-0-0.33

20120626 20120626

0 0 0 0 0

20120625 20120626 20120626

0.42 0.25 0.33 0.33 0.42



20120626 20120626 20120626 20120627 20120626

0 0 0 0 0

0.33 0.25 0.42 0.42 0.33

USEPA

Residential

Screening

Level

USEPA Non-

Residential

Screening Level

USEPA

Residential

Screening

Level

USEPA Non-

Residential

Screening Level

USEPA

Residential

Screening

Level

USEPA Non-

Residential

Screening Level



TABLE 4-3



PAGE 2 OF 3

LOCATION

SAMPLE ID

SAMPLE DATE

TOP DEPTH

BOTTOM DEPTH

AROCLOR-1248 1 10

AROCLOR-1260 1 10

LOCATION

SAMPLE ID

SAMPLE DATE

TOP DEPTH

BOTTOM DEPTH

AROCLOR-1248 1 10

AROCLOR-1260 1 10

LOCATION

SAMPLE ID

SAMPLE DATE

TOP DEPTH

BOTTOM DEPTH

AROCLOR-1248 1 10

AROCLOR-1260 1 10


USEPA

Residential

Screening

Level

USEPA Non-

Residential

Screening Level

USEPA

Residential

Screening

Level

USEPA Non-

Residential

Screening Level

USEPA

Residential

Screening

Level

USEPA Non-

Residential

Screening Level



-- -- -- -- --

0.023 J 0.025 J 1.2 0.23 J 0.14

-- -- -- -- --

0.052 5.8 0.13 -- 0.028 J

-- -- 0.13 -- --

-- 12 0.22 -- --

E-SB-940E-SB-936 E-SB-937 E-SB-938 E-SB-939

E-SB-938-CS-0-0.17 E-SB-939-CS-0-0.33 E-SB-940-CS-0-0.33E-SB-936-CS-0-0.25 E-SB-937-CS-0-0.25

2012062620120626 20120625 20120625 20120626

0 0 0 0 0

0.25 0.25 0.17 0.33 0.33



20120625 20120625 20120626 20120627 20120628

0 0 0 0 0

0.25 0.33 0.25 0.5 0.5



20120626 20120626 20120625 20120627 20120627

0 0 0 0

0.33 0.25 0.25 0.5 0.5

0

TABLE 4-3



PAGE 3 OF 3

LOCATION

SAMPLE ID

SAMPLE DATE

TOP DEPTH

BOTTOM DEPTH

AROCLOR-1248 1 10

AROCLOR-1260 1 10

LOCATION

SAMPLE ID

SAMPLE DATE

TOP DEPTH

BOTTOM DEPTH

AROCLOR-1248 1 10

AROCLOR-1260 1 10

LOCATION

SAMPLE ID

SAMPLE DATE

TOP DEPTH

BOTTOM DEPTH

AROCLOR-1248 1 10

AROCLOR-1260 1 10


USEPA

Residential

Screening

Level

USEPA Non-

Residential

Screening Level

USEPA

Residential

Screening

Level

USEPA Non-

Residential

Screening Level

USEPA

Residential

Screening

Level

USEPA Non-

Residential

Screening Level



-- -- -- --

0.081 0.14 -- --

-- -- --

0.09 0.021 J 0.058

-- -- --

-- -- --

Notes:

EXCEEDS BOTH CRITERIA

EXCEEDS ONE CRITERION-- - Not detected


USEPA - United States Environmental Protection Agency

20120628

0

0.42

E-SB-962

E-SB-962-CS-0-0.42

E-SB-951 E-SB-952 E-SB-953 E-SB-954

E-SB-952-CS-0-0.33 E-SB-953-CS-0-0.42 E-SB-954-CS-0-0.25E-SB-951-CS-0-0.33

20120625 20120627 2012062520120626

0 0 00

0.33 0.42 0.250.33

E-SB-961

E-SB-961-CS-0-0.5

20120627

0

0.5

E-SB-963

E-SB-961-CS-0-0.5

20120627

0

0.5

0

0.5

E-SB-970

E-SB-970-CS-0-0.5

20120627

0

0.5

E-SB-971

E-SB-971-CS-0-0.5

20120627

0

0.5

E-SB-969

E-SB-969-CS-0-0.5

20120627

J - Positive result is considered

estimated as a result of

TABLE 4-4

STATISTICAL SUMMARY OF ANALYTES DETECTED IN BLOCK E PERIPHERAL SHALLOW-SOIL SAMPLING, JUNE-JULY, 2012


PAGE 1 OF 2


Chemical(1)of Detection Non Non Detected Detected Maximum All Positive Deviation


Inorganics (mg/kg)

ARSENIC 7/7 100 0.81 J 4.6 E-SB-958-2-3 2.8 2.8 1.4

BARIUM 7/7 100 10 J 90 E-SB-976-0-0.5 32.9 32.9 28.2

CHROMIUM 7/7 100 7.1 30 E-SB-976-0-0.5 15.8 15.8 7.4

COBALT 7/7 100 3.2 29 E-SB-966-0-0.5 7.3 7.3 9.6

COPPER 7/7 100 5.4 48 E-SB-976-0-0.5 15.4 15.4 14.9

NICKEL 7/7 100 4.8 49 E-SB-966-0-0.5 17.0 17.0 15.3

VANADIUM 7/7 100 9.5 33 E-SB-976-0-0.5 22.6 22.6 8.2

ZINC 7/7 100 13 450 E-SB-976-0-0.5 94.9 94.9 158.9

LEAD 6/7 86 11 11 3.2 450 E-SB-976-0-0.5 70.2 81.0 167.5

MERCURY 6/7 86 0.019 0.019 0.016 J 2.4 E-SB-976-0-0.5 0.39 0.45 0.89

BERYLLIUM 5/7 71 0.045 0.37 0.56 6.5 E-SB-966-0-0.5 1.53 2.10 2.26

CADMIUM 4/7 57 0.036 0.17 0.074 J 3.4 E-SB-976-0-0.5 0.62 1.05 1.24

MOLYBDENUM 3/7 43 0.27 1.3 0.39 J 1.5 J E-SB-976-0-0.5 0.58 0.82 0.46

SELENIUM 2/7 29 0.45 2.2 0.56 J 0.72 J E-SB-958-2-3 0.60 0.64 0.39

SILVER 2/7 29 0.1 0.5 0.17 J 0.7 J E-SB-976-0-0.5 0.22 0.44 0.23

ANTIMONY 1/7 14 0.39 1.9 6.2 6.2 E-SB-976-0-0.5 1.27 6.20 2.20

THALLIUM 1/7 14 0.53 0.59 0.65 J 0.65 J E-SB-966-2-3 0.33 0.65 0.14

Miscellaneous (mg/kg)

HEXAVALENT CHROMIUM 2/7 29 0.29 0.32 0.33 J 0.51 J E-SB-966-0-0.5 0.23 0.42 0.14

PAHs (ug/kg)

FLUORANTHENE 65/93 70 3.5 9.2 4 J 89000 E-SB-974-0-0.5 2618 3744 10502

PYRENE 64/93 69 3.5 9.2 3.9 J 61000 E-SB-974-0-0.5 2050 2977 7498

BAP EQUIVALENT-HALFND 63/93 68 3.5 9.2 4.50 45369 E-SB-974-0-0.5 1527 2253 5485

BENZO(B)FLUORANTHENE 63/93 68 3.5 9.2 4.1 J 47000 E-SB-974-0-0.5 1506 2222 5685

BENZO(A)PYRENE 59/93 63 3.5 9.2 3.8 J 34000 E-SB-974-0-0.5 1106 1742 4073

CHRYSENE 59/93 63 1.2 3.1 4.3 J 39000 E-SB-974-0-0.5 1278 2014 4710

BENZO(A)ANTHRACENE 58/93 62 3.5 9.2 4.5 J 43000 E-SB-974-0-0.5 1267 2030 5034

PHENANTHRENE 57/93 61 3.5 9.2 5.1 J 63000 E-SB-974-0-0.5 1756 2864 7405

BENZO(G,H,I)PERYLENE 53/93 57 3.5 9.2 7.2 J 21000 E-SB-974-0-0.5 740 1298 2549

BENZO(K)FLUORANTHENE 53/93 57 3.5 9.2 5.6 J 20000 E-SB-974-0-0.5 682 1195 2453

INDENO(1,2,3-CD)PYRENE 53/93 57 3.5 9.2 6.7 J 19000 E-SB-974-0-0.5 644 1128 2291

ANTHRACENE 45/93 48 3.5 9.2 5.2 J 13000 E-SB-974-0-0.5 406 837 1592

NAPHTHALENE 37/93 40 3.5 68 4.1 J 4400 E-SB-974-0-0.5 103 255 510

FLUORENE 34/93 37 3.4 35 5.4 J 8200 E-SB-974-0-0.5 215 583 973

ACENAPHTHENE 33/93 35 3.5 35 4.3 J 15000 E-SB-974-0-0.5 277 775 1607

2-METHYLNAPHTHALENE 27/93 29 3.4 72 4 J 3300 E-SB-965-0-0.5 76 254 384

ACENAPHTHYLENE 23/93 25 3.5 72 3.8 J 3300 E-SB-977-0-0.5 87 343 416

1-METHYLNAPHTHALENE 22/93 24 3.4 72 4.7 J 4100 E-SB-965-0-0.5 75 305 442

DIBENZO(A,H)ANTHRACENE 18/93 19 3.5 460 5.6 J 1200 E-SB-978-0.5-2 72 341 216

TABLE 4-4

STATISTICAL SUMMARY OF ANALYTES DETECTED IN BLOCK E PERIPHERAL SHALLOW-SOIL SAMPLING, JUNE-JULY, 2012


PAGE 2 OF 2


Chemical(1)of Detection Non Non Detected Detected Maximum All Positive Deviation


PCBs (mg/kg)

AROCLOR-1260 47/85 55 17 0.09 0.021 J 800 E-SB-980-0-0.5 26.6 48.4 117

AROCLOR-1242 1/85 1 13 27 0.02 J 0.020 J E-SB-977-2-3 0.647 0.020 2.2

AROCLOR-1248 1/85 1 17 36 39 39 E-SB-978-0-0.5 1.230 39 4.9

1 Chemicals not detected in any of the samples are not shown on this table.J = Positive result estimated due to quality control noncompliance.mg/kg - milligrams per kilogram

ug/kg - micrograms per kilogram



Associated Samples

E-SB-955-0-0.5 20120629 S-SB-963-2-2.5 20120627 E-SB-973-0-0.5 20120629 E-SB-980-0-0.5 20120628

E-SB-955-0.5-2 20120629 S-SB-964-0-0.5 20120627 E-SB-973-0.5-2 20120629 E-SB-980-0.5-2 20120628

E-SB-955-2-3 20120629 S-SB-964-0.5-2 20120627 E-SB-973-2-3 20120629 E-SB-980-2-3 20120628

E-SB-955-3-4 20120629 S-SB-964-2-3 20120627 E-SB-973-3-4 20120629 E-SB-980-3-4 20120628

E-SB-956-0-0.5 20120628 S-SB-964-3-4 20120627 E-SB-974-0-0.5 20120629 E-SB-981-0-0.5 20120628

E-SB-956-0.5-2 20120628 E-SB-965-0-0.5 20120627 E-SB-974-0.5-2 20120629 E-SB-981-0.5-2 20120628

E-SB-956-2-3 20120628 S-SB-965-2-3 20120627 E-SB-974-2-3 20120629 E-SB-981-2-3 20120628

E-SB-956-3-4 20120628 E-SB-965-0.5-2 20120627 E-SB-974-3-4 20120629 E-SB-981-3-3.5 20120628

E-SB-957-0-0.5 20120628 E-SB-966-0-0.5 20120627 E-SB-975-0-0.5 20120629 E-SB-982-0-0.5 20120628

E-SB-957-0.5-2 20120628 E-SB-966-0.5-2 20120627 E-SB-975-0.5-2 20120629 E-SB-982-0.5-2 20120628

E-SB-957-2-3 20120628 E-SB-966-2-3 20120627 E-SB-975-2-3 20120629 E-SB-982-2-3 20120628

E-SB-957-3-4 20120628 E-SB-967-0-0.5 20120627 E-SB-975-3-4 20120629 E-SB-982-3-4 20120628

E-SB-958-0-0.5 20120628 E-SB-967-0.5-2 20120627 E-SB-976-0-0.5 20120629

E-SB-958-0.5-2 20120628 E-SB-968-0-0.5 20120627 E-SB-976-0.5-2 20120629

E-SB-958-2-3 20120628 E-SB-968-0.5-2 20120627 E-SB-976-2-3 20120629

E-SB-958-3-4 20120628 E-SB-968-2-3 20120627 E-SB-976-3-4 20120629

E-SB-959-0-0.5 20120628 E-SB-968-3-4 20120627 E-SB-977-0-0.5 20120629

E-SB-959-0.5-2 20120628 E-SB-969-0.5-2 20120627 E-SB-977-0.5-2 20120629

E-SB-959-2-3 20120628 E-SB-969-2-3 20120627 E-SB-977-2-3 20120629

E-SB-959-3-4 20120628 E-SB-970-0.5-2 20120627 E-SB-977-3-4 20120629

E-SB-960-1-2 20120628 E-SB-970-2-3 20120627 E-SB-978-0-0.5 20120629

E-SB-960-2-3.5 20120628 E-SB-971-0.5-2 20120627 E-SB-978-0.5-2 20120629

E-SB-961-1-2 20120628 E-SB-971-2-3 20120627 E-SB-978-2-2.5 20120629

E-SB-961-2-3 20120628 E-SB-972-0-0.5 20120629 E-SB-979-0-0.5 20120628

E-SB-962-1-2 20120628 E-SB-972-0.5-2 20120629 E-SB-979-0.5-2 20120628

E-SB-962-2-3 20120628 E-SB-972-2-3 20120629 E-SB-979-2-3 20120628

S-SB-963-0.5-2 20120627 E-SB-972-3-4 20120629 E-SB-979-3-4 20120628

TABLE 4-5

ANALYTES DETECTED IN BLOCK E PERIPHERAL SHALLOW SOIL-SAMPLES, JUNE-JULY 2012


PAGE 1 OF 14

SAMPLE ID Non-

SAMPLE DATE Residential Residential

TOP DEPTH (FEET BELOW GRADE) Screening Screening

BOTTOM DEPTH (FEET BELOW GRADE) Levels Levels

METALS (MG/KG)

ANTIMONY 3.1 41 NA NA NA NA NA NA NA

ARSENIC 12(1) 12(1) NA NA NA NA NA NA NA

BARIUM 1600 20000 NA NA NA NA NA NA NA

BERYLLIUM 16 200 NA NA NA NA NA NA NA

CADMIUM 3.9 51 NA NA NA NA NA NA NA

CHROMIUM 23 310 NA NA NA NA NA NA NA

COBALT NA NA NA NA NA NA NA NA NA

COPPER 310 4100 NA NA NA NA NA NA NA

LEAD 400 1000 NA NA NA NA NA NA NA

MERCURY 2.3 31 NA NA NA NA NA NA NA

MOLYBDENUM NA NA NA NA NA NA NA NA NA

NICKEL 160 2000 NA NA NA NA NA NA NA

SELENIUM 39 510 NA NA NA NA NA NA NA

SILVER 39 510 NA NA NA NA NA NA NA

THALLIUM 0.55 7.2 NA NA NA NA NA NA NA

VANADIUM 91(1) 91(1) NA NA NA NA NA NA NA

ZINC 2300 31000 NA NA NA NA NA NA NA

HEXAVALENT CHROMIUM 23 310 NA NA NA NA NA NA NA

PCBS (UG/KG)AROCLOR-1242 1000 10000 -- -- -- -- -- -- --AROCLOR-1248 1000 10000 -- -- -- -- -- -- --AROCLOR-1260 1000 10000 7100 540 -- -- 22000 130 29 J

1-METHYLNAPHTHALENE NA NA 11 -- -- -- 37 -- --2-METHYLNAPHTHALENE NA NA 12 -- -- -- 48 -- 7.9

ACENAPHTHENE 470000 6100000 48 8.9 -- -- 280 -- 18

ACENAPHTHYLENE 470000 6100000 25 -- -- -- -- -- --

ANTHRACENE 2300000 31000000 97 14 -- -- 520 7.9 8.4 L

BAP EQUIVALENT-HALFND 140 2900 754.94 76.195 -- -- 1212.7 29.122 27.165

BENZO(A)ANTHRACENE 220 3900 510 J 62 -- -- 950 20 21 L

BENZO(A)PYRENE 22 390 490 56 -- -- 830 21 19

BENZO(B)FLUORANTHENE 220 3900 820 83 -- -- 1000 29 26

BENZO(G,H,I)PERYLENE 230000 3100000 350 40 -- -- 470 14 16

BENZO(K)FLUORANTHENE 2200 39000 440 38 -- -- 560 10 14

CHRYSENE 22000 390000 540 J 65 -- -- 1100 22 25 L

DIBENZO(A,H)ANTHRACENE 22 390 95 -- -- -- 130 -- --

FLUORANTHENE 310000 4100000 1100 120 -- -- 2200 34 45 L

FLUORENE 310000 4100000 41 8.8 -- -- 250 -- 18

INDENO(1,2,3-CD)PYRENE 220 3900 320 35 -- -- 510 12 14

NAPHTHALENE 160000 2000000 16 4.1 J -- -- 63 -- 37

PHENANTHRENE 2300000 31000000 560 73 -- -- 2000 30 53 L

PYRENE 230000 3100000 800 J 95 -- -- 1600 30 35 L

POLYCYCLIC AROMATIC HYDROCARBONS (UG/KG)

MISCELLANEOUS PARAMETERS (MG/KG)

E-SB-956-2-3E-SB-955-0.5-2E-SB-955-0-0.5 E-SB-955-2-3 E-SB-955-3-4 E-SB-956-0.5-2E-SB-956-0-0.5

2012062920120629 20120629 20120629 2012062820120628 20120628

20.50 2 3 0.50

320.5 3 4 20.5

TABLE 4-5



PAGE 2 OF 14

SAMPLE ID Non-




METALS (MG/KG)

ANTIMONY 3.1 41

ARSENIC 12(1) 12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MERCURY 2.3 31MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

THALLIUM 0.55 7.2

VANADIUM 91(1) 91(1)

ZINC 2300 31000

HEXAVALENT CHROMIUM 23 310PCBS (UG/KG)AROCLOR-1242 1000 10000AROCLOR-1248 1000 10000AROCLOR-1260 1000 10000

1-METHYLNAPHTHALENE NA NA2-METHYLNAPHTHALENE NA NA

ACENAPHTHENE 470000 6100000

ACENAPHTHYLENE 470000 6100000

ANTHRACENE 2300000 31000000BAP EQUIVALENT-HALFND 140 2900

BENZO(A)ANTHRACENE 220 3900

BENZO(A)PYRENE 22 390

BENZO(B)FLUORANTHENE 220 3900

BENZO(G,H,I)PERYLENE 230000 3100000

BENZO(K)FLUORANTHENE 2200 39000

CHRYSENE 22000 390000

DIBENZO(A,H)ANTHRACENE 22 390

FLUORANTHENE 310000 4100000

FLUORENE 310000 4100000

INDENO(1,2,3-CD)PYRENE 220 3900

NAPHTHALENE 160000 2000000

PHENANTHRENE 2300000 31000000

PYRENE 230000 3100000



NA NA NA NA NA NA NA






NA NA NA NA NA NA NANA NA NA NA NA NA NA










-- -- -- -- -- -- ---- -- -- -- -- -- ---- 39000 2200 320 23 J 15000 22000

8.4 49 -- -- -- -- --15 63 -- -- -- -- --7.7 170 -- -- -- -- --

-- 90 -- -- -- -- --

8 L 390 -- -- -- -- --

29.63 3466.9 34.96 10.8476 -- 46.522 38.41626 L 2300 24 -- -- 28 22

20 2400 26 7.5 -- 34 28

34 3400 30 11 -- 51 39

18 1800 19 -- -- 26 27

15 1400 18 -- -- 23 23

30 L 2900 30 9.1 L -- 42 36

-- 330 -- -- -- -- --

42 L 4900 46 12 L -- 51 45

8.4 150 -- -- -- -- --

16 1500 15 -- -- 26 23

17 110 -- -- -- -- 7.4

37 L 2200 22 -- -- 24 24

37 L 4300 41 13 L -- 44 41

E-SB-956-3-4 E-SB-957-0.5-2E-SB-957-0-0.5 E-SB-957-2-3 E-SB-957-3-4 E-SB-958-0.5-2E-SB-958-0-0.5

20120628 2012062820120628 20120628 20120628 2012062820120628

3 0.50 2 3 0.50

4 3 4 20.520.5

TABLE 4-5



PAGE 3 OF 14

SAMPLE ID Non-




METALS (MG/KG)

ANTIMONY 3.1 41

ARSENIC 12(1) 12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51


COPPER 310 4100

LEAD 400 1000


NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

THALLIUM 0.55 7.2


ZINC 2300 31000











CHRYSENE 22000 390000



FLUORENE 310000 4100000




PYRENE 230000 3100000



-- NA NA NA NA NA NA

4.6 NA NA NA NA NA NA

35 J NA NA NA NA NA NA


0.074 J NA NA NA NA NA NA

17 NA NA NA NA NA NA

3.2 NA NA NA NA NA NA6.9 NA NA NA NA NA NA



0.58 J NA NA NA NA NA NA6.3 NA NA NA NA NA NA







-- -- -- -- NA NA ---- -- -- -- NA NA --

3000 290 740 29 J NA NA --

-- -- -- -- -- -- 11-- -- -- -- -- -- 18-- -- 8.2 -- -- -- 5.2 J

-- -- 10 -- -- -- --

12 L -- 24 -- -- -- 5.2 J

62.418 -- 236.2 -- 10.1694 -- 20.39654 L -- 170 -- 6.2 J -- 17

46 -- 160 -- 6.6 J -- 14

58 -- 240 -- 10 -- 18

36 -- 140 -- -- -- 12

31 -- 100 -- -- -- 12

58 L -- 200 -- 6.9 J -- 16

-- -- 23 -- -- -- --

93 L -- 290 -- 12 -- 29

-- -- -- -- -- -- 5.5 J

30 -- 110 -- -- -- 9.6

-- -- 9.6 -- -- -- 25

54 L -- 130 -- 5.1 J -- 25

80 L -- 290 -- 11 L -- 23

E-SB-958-2-3 E-SB-958-3-4 E-SB-959-0.5-2E-SB-959-0-0.5 E-SB-959-2-3 E-SB-959-3-4 E-SB-960-1-2

20120628 20120628 2012062820120628 20120628 20120628 20120628

2 3 0.50 2 3 1

3 4 20.5 3 4 2

TABLE 4-5



PAGE 4 OF 14

SAMPLE ID Non-




METALS (MG/KG)

ANTIMONY 3.1 41

ARSENIC 12(1) 12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51


COPPER 310 4100

LEAD 400 1000


NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

THALLIUM 0.55 7.2


ZINC 2300 31000











CHRYSENE 22000 390000



FLUORENE 310000 4100000




PYRENE 230000 3100000



NA NA NA NA -- NA NA

NA NA NA NA 3.1 NA NA

NA NA NA NA 12 J NA NA

NA NA NA NA 0.37 B NA NA



NA NA NA NA 3.8 NA NANA NA NA NA 5.4 NA NA


NA NA NA NA 0.018 J NA NA

NA NA NA NA 0.39 J NA NANA NA NA NA 4.8 NA NA




NA NA NA NA 18 J NA NA

NA NA NA NA 13 NA NA


-- -- -- -- -- -- ---- -- -- -- -- -- ---- -- -- -- -- -- --

-- -- -- -- -- -- ---- -- -- -- -- -- ---- -- -- -- -- -- --

-- -- -- -- -- -- --

-- -- -- -- -- -- --

-- -- -- -- -- 6.9278 ---- -- -- -- -- 4.5 J --

-- -- -- -- -- 3.8 J --

-- -- -- -- -- 6.2 J --

-- -- -- -- -- -- --

-- -- -- -- -- -- --

-- -- -- -- -- 4.3 J --

-- -- -- -- -- -- --

-- -- -- 5.7 J -- 9.6 --

-- -- -- -- -- -- --

-- -- -- -- -- -- --

-- -- -- 5.6 J -- 7.6 --

-- -- -- -- -- 11 --

-- -- -- 3.9 J -- 6.8 J --

E-SB-960-2-3.5 E-SB-961-1-2 E-SB-961-2-3 E-SB-962-1-2 E-SB-962-2-3 S-SB-963-0.5-2 S-SB-963-2-2.5

20120628 20120628 20120628 20120628 20120628 20120627 20120627

2 1 2 1 2 0.5 2

3.5 2 3 2 3 2 2.5

TABLE 4-5



PAGE 5 OF 14

SAMPLE ID Non-




METALS (MG/KG)

ANTIMONY 3.1 41

ARSENIC 12(1) 12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51


COPPER 310 4100

LEAD 400 1000


NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

THALLIUM 0.55 7.2


ZINC 2300 31000











CHRYSENE 22000 390000



FLUORENE 310000 4100000




PYRENE 230000 3100000



















-- -- NA NA -- -- NA-- -- NA NA -- -- NA

650 -- NA NA 48 30 J NA

-- -- -- -- 4100 -- 18 J56 -- -- -- 3300 4.7 J 19 J93 -- -- -- 1500 4.3 J 18 J

220 7.7 -- -- 2200 7.4 32 J

450 9.2 9 J -- 5700 19 120 J

3154.3 42.644 61.836 26.331 10251.4 94.256 377.42000 34 47 J 19 J 8500 78 260 J

2100 31 46 J 19 J 7400 72 270 J

2700 42 63 J 22 J 6200 78 240 J

1600 29 43 J 16 J 4500 61 190 J

1200 21 28 J 11 J 3200 32 110 J

2300 34 56 J 21 J 9400 86 300 J

440 -- -- -- 1000 -- 43 J

3400 55 80 J 28 J 16000 110 420 J

110 -- -- -- 4000 7.9 44 J

1300 20 27 J 13 J 3400 45 130 J

95 -- -- -- 2200 5.3 J 18 J

1100 20 35 J 12 J 23000 81 450 J

3500 49 80 J 33 J 20000 160 670 J

S-SB-964-0.5-2S-SB-964-0-0.5 S-SB-964-2-3 S-SB-964-3-4 E-SB-965-0.5-2E-SB-965-0-0.5 S-SB-965-2-3

2012062720120627 20120627 20120627 2012062720120627 20120627

0.50 2 3 0.50 2

20.5 3 4 20.5 3

TABLE 4-5



PAGE 6 OF 14

SAMPLE ID Non-




METALS (MG/KG)

ANTIMONY 3.1 41

ARSENIC 12(1) 12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51


COPPER 310 4100

LEAD 400 1000


NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

THALLIUM 0.55 7.2


ZINC 2300 31000











CHRYSENE 22000 390000



FLUORENE 310000 4100000




PYRENE 230000 3100000



-- NA -- NA NA NA NA

3.9 J NA 1.8 L NA NA NA NA

45 J NA 22 NA NA NA NA

6.5 NA -- NA NA NA NA

0.42 J NA 0.29 J NA NA NA NA

17 NA 7.1 NA NA NA NA

29 NA 3.5 NA NA NA NA18 NA 9.2 J NA NA NA NA

15 NA 11 B NA NA NA NA

0.2 NA 0.057 J NA NA NA NA

-- NA -- NA NA NA NA49 NA 10 NA NA NA NA

-- NA -- NA NA NA NA

-- NA 0.17 J NA NA NA NA

-- NA 0.65 J NA NA NA NA

31 NA 9.5 NA NA NA NA

94 NA 24 NA NA NA NA

0.51 J NA 0.33 J NA NA NA NA

-- -- NA -- -- -- ---- -- NA -- -- -- --

48 25 J NA 6400 1200 -- --

-- 30 20 J 240 -- -- ---- 43 22 J 240 -- -- ---- 120 63 J 350 -- -- --

12 100 47 J 460 -- -- --

22 360 140 J 1300 78 5.6 J --

89.122 1491.2 1015.82 4784.6 220.81 31.075 7.323767 1000 650 J 3300 190 21 --

69 1000 680 J 3200 150 22 4.5 J

70 1100 860 J 3500 230 33 5.8 J

57 690 510 J 2500 140 18 --

35 510 410 J 2100 110 15 --

72 1100 720 J 3600 210 25 5.2 J

-- 210 140 J 690 -- -- --

75 1800 1200 J 6500 380 43 8

5.4 J 130 62 J 390 -- -- --

42 650 400 J 1900 100 17 --

4.1 J 81 36 J 320 -- -- --

48 1100 700 J 4100 190 24 5.2 J

110 1600 1200 J 5900 300 36 8.4

E-SB-966-0.5-2E-SB-966-0-0.5 E-SB-966-2-3 E-SB-967-0.5-2E-SB-967-0-0.5 E-SB-968-0.5-2E-SB-968-0-0.5

2012062720120627 20120627 2012062720120627 2012062720120627

0.50 2 0.50 0.50

20.5 3 20.5 20.5

TABLE 4-5



PAGE 7 OF 14

SAMPLE ID Non-




METALS (MG/KG)

ANTIMONY 3.1 41

ARSENIC 12(1) 12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51


COPPER 310 4100

LEAD 400 1000


NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

THALLIUM 0.55 7.2


ZINC 2300 31000











CHRYSENE 22000 390000



FLUORENE 310000 4100000




PYRENE 230000 3100000



















NA NA -- -- -- -- --NA NA -- -- -- -- --NA NA -- -- -- -- --

-- -- -- -- -- -- ---- -- -- -- -- -- ---- -- -- -- -- -- --

-- -- -- -- -- -- --

-- -- -- -- -- -- --

16.5575 4.9791 4.9791 -- -- -- --12 J -- -- -- -- -- --

12 J -- -- -- -- -- --

14 J 8.9 J 8.9 -- -- -- --

-- -- -- -- -- -- --

-- -- -- -- -- -- --

15 J -- -- -- -- -- --

-- -- -- -- -- -- --

15 J 8.2 J 10 -- -- -- --

-- -- -- -- -- -- --

-- -- -- -- -- -- --

-- -- -- -- -- -- --

8.9 J -- -- -- -- -- --

18 J 10 J 7.4 J -- -- -- --

E-SB-968-2-3 E-SB-968-3-4 E-SB-969-0.5-2 E-SB-969-2-3 E-SB-970-0.5-2 E-SB-970-2-3 E-SB-971-0.5-2

20120627 20120627 20120627 20120627 20120627 20120627 20120627

2 3 0.5 2 0.5 2 0.5

3 4 2 3 2 3 2

TABLE 4-5



PAGE 8 OF 14

SAMPLE ID Non-




METALS (MG/KG)

ANTIMONY 3.1 41

ARSENIC 12(1) 12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51


COPPER 310 4100

LEAD 400 1000


NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

THALLIUM 0.55 7.2


ZINC 2300 31000











CHRYSENE 22000 390000



FLUORENE 310000 4100000




PYRENE 230000 3100000









3.3 NA NA NA NA NA NA8.6 NA NA NA NA NA NA



-- NA NA NA NA NA NA9.8 NA NA NA NA NA NA







-- -- -- -- -- -- ---- -- -- -- -- -- ---- 720 -- -- -- 1300 22 J

-- 16 -- -- -- 55 J 4.7 J-- 20 -- -- -- 62 J 7.1 J-- 79 -- -- -- 470 48

-- 29 -- -- -- 86 --

-- 160 -- -- 5.4 J 1000 78

-- 1133.38 16.488 16.8 25.199 4274.9 174.81-- 870 14 14 20 3700 170

-- 850 11 11 18 3200 130

-- 1300 15 17 22 4700 170

-- 590 7.2 J 8.6 13 2000 85

-- 760 5.6 J 5.8 J 7.8 2300 85

-- 930 12 12 21 3900 160

-- -- -- -- -- -- --

-- 1700 22 26 39 8000 380

-- 55 -- -- -- 370 39

-- 540 6.7 J 7.8 10 1900 79

-- 23 -- -- -- 66 J 19

-- 730 11 14 20 4500 320

-- 1200 18 21 32 5600 270

E-SB-971-2-3 E-SB-972-0.5-2E-SB-972-0-0.5 E-SB-972-2-3 E-SB-972-3-4 E-SB-973-0.5-2E-SB-973-0-0.5

20120627 2012062920120629 20120629 20120629 2012062920120629

2 0.50 2 3 0.50

3 20.5 3 4 20.5

TABLE 4-5



PAGE 9 OF 14

SAMPLE ID Non-




METALS (MG/KG)

ANTIMONY 3.1 41

ARSENIC 12(1) 12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51


COPPER 310 4100

LEAD 400 1000


NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

THALLIUM 0.55 7.2


ZINC 2300 31000











CHRYSENE 22000 390000



FLUORENE 310000 4100000




PYRENE 230000 3100000



















-- -- -- -- -- -- ---- -- -- -- -- -- ---- -- 320000 39 -- -- 87000

10 J -- 1200 -- -- -- --14 J -- 1700 -- -- -- --83 J 13 15000 -- -- -- 210

-- -- 650 J -- -- -- 26 J

120 J 23 13000 -- -- -- 320

322.47 58.629 45369 -- -- -- 2795.2270 J 53 43000 -- -- -- 1900

210 J 40 34000 -- -- -- 1900

290 J 54 47000 -- -- -- 2600

140 J 24 21000 -- -- -- 1200

120 J 18 20000 -- -- -- 1300

270 J 49 39000 -- -- -- 2200

42 J 5.6 J -- -- -- -- 320

590 J 110 89000 -- -- -- 3700

62 J 9.4 8200 -- -- -- 150

130 J 21 19000 -- -- -- 1100

40 J 4.4 J 4400 -- -- -- 32 J

510 J 89 63000 -- -- -- 2000

480 J 85 61000 -- -- -- 3200

E-SB-973-2-3 E-SB-973-3-4 E-SB-974-0.5-2E-SB-974-0-0.5 E-SB-974-2-3 E-SB-974-3-4 E-SB-975-0-0.5

20120629 20120629 2012062920120629 20120629 20120629 20120629

2 3 0.50 2 3 0

3 4 20.5 3 4 0.5

TABLE 4-5



PAGE 10 OF 14

SAMPLE ID Non-




METALS (MG/KG)

ANTIMONY 3.1 41

ARSENIC 12(1) 12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51


COPPER 310 4100

LEAD 400 1000


NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

THALLIUM 0.55 7.2


ZINC 2300 31000











CHRYSENE 22000 390000



FLUORENE 310000 4100000




PYRENE 230000 3100000



NA NA NA 6.2 NA NA --

NA NA NA 3.6 NA NA 1.5 J

NA NA NA 90 NA NA 16 J

NA NA NA 0.64 NA NA 1.2

NA NA NA 3.4 NA NA --

NA NA NA 30 NA NA 13

NA NA NA 4.4 NA NA 4NA NA NA 48 NA NA 12

NA NA NA 450 NA NA 6 L

NA NA NA 2.4 NA NA 0.016 J

NA NA NA 1.5 J NA NA --NA NA NA 21 NA NA 18

NA NA NA 0.56 J NA NA --

NA NA NA 0.7 J NA NA --

NA NA NA -- NA NA --



NA NA NA -- NA NA --

-- -- -- -- -- -- ---- -- -- -- -- -- --

7600 -- -- 35000 210 -- --

-- -- 57 260 J -- -- ---- 72 140 320 J 4 J -- ---- -- 170 3900 48 -- --

-- -- -- 390 3.8 J -- --

6.1 J 45 98 5400 58 -- --

53.679 115.891 246.15 21539 250.21 8.2246 --31 100 170 19000 J 210 6 J --

39 82 150 16000 190 4.9 J --

64 84 210 25000 250 6.1 J --

45 54 86 10000 120 -- --

19 60 97 11000 120 -- --

39 91 180 19000 J 210 5.6 J --

-- -- 45 -- -- -- --

53 170 360 42000 430 9.9 4 J

-- 39 170 2400 29 -- --

28 53 120 9200 110 -- --

-- 59 210 620 8.6 -- --

27 170 220 24000 270 6.4 J --

44 140 280 29000 J 330 8 --

E-SB-975-0.5-2 E-SB-975-2-3 E-SB-975-3-4 E-SB-976-0.5-2E-SB-976-0-0.5 E-SB-976-2-3 E-SB-976-3-4

20120629 20120629 20120629 2012062920120629 20120629 20120629

3 0.50 2 30.5 2

2 3 4 20.5 3 4

TABLE 4-5



PAGE 11 OF 14

SAMPLE ID Non-




METALS (MG/KG)

ANTIMONY 3.1 41

ARSENIC 12(1) 12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51


COPPER 310 4100

LEAD 400 1000


NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

THALLIUM 0.55 7.2


ZINC 2300 31000











CHRYSENE 22000 390000



FLUORENE 310000 4100000




PYRENE 230000 3100000



















-- -- 20 J -- -- -- ---- -- -- -- 39000 -- --

27000 -- -- -- 97000 16000 860

270 -- -- -- -- -- --280 -- -- -- -- -- --240 -- -- -- 130 840 --

3300 -- -- -- 26 J -- --

2100 -- -- -- 240 2700 --

4912.2 4.4991 -- -- 2024.8 12383.4 30.1243600 J -- -- -- 1300 9700 21

3800 J -- -- -- 1300 8600 22

4600 J 4.1 J -- -- 2100 11000 28

3400 J -- -- -- 850 4900 16

2100 J -- -- -- 730 4400 10

4200 J -- -- -- 1500 9400 24

-- -- -- -- 290 1200 --

6100 4.4 J -- -- 2700 20000 33

640 -- -- -- 110 1000 --

2500 J -- -- -- 860 4600 12

300 -- -- -- 22 J 160 --

3500 -- -- -- 1300 11000 10

7500 J 5.6 J -- -- 2200 17000 33

E-SB-977-0.5-2E-SB-977-0-0.5 E-SB-977-2-3 E-SB-977-3-4 E-SB-978-0.5-2E-SB-978-0-0.5 E-SB-978-2-2.5

2012062920120629 20120629 20120629 2012062920120629 20120629

0.50 2 3 0.50 2

20.5 3 4 20.5 2.5

TABLE 4-5



PAGE 12 OF 14

SAMPLE ID Non-




METALS (MG/KG)

ANTIMONY 3.1 41

ARSENIC 12(1) 12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51


COPPER 310 4100

LEAD 400 1000


NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

THALLIUM 0.55 7.2


ZINC 2300 31000











CHRYSENE 22000 390000



FLUORENE 310000 4100000




PYRENE 230000 3100000



















-- -- -- -- -- -- ---- -- -- -- -- -- --

55000 32 J -- -- 800000 730 87

110 -- -- 140 -- -- --110 -- -- 210 -- -- --740 -- -- 130 280 -- --

-- -- -- -- 99 J -- --

1300 -- -- 210 L 680 -- --

8274.6 5.75965 -- 361.59 3608.4 -- --5600 8 -- 330 L 2500 -- --

5400 -- -- 250 2700 -- --

7800 9.5 -- 310 4100 -- --

4400 -- -- 120 2600 -- --

3800 -- -- 130 2200 -- --

6600 -- -- 290 L 2400 -- --

1100 -- -- 35 -- -- --

12000 13 -- 730 L 5300 -- --

510 -- -- 160 270 -- --

3900 -- -- 110 1900 -- --

190 -- -- 120 -- -- --

6600 -- -- 820 L 2700 -- --

9800 11 -- 550 L 3000 -- --

E-SB-979-0.5-2E-SB-979-0-0.5 E-SB-979-2-3 E-SB-979-3-4

20120628 20120628 2012062820120628

2 30.50

420.5 3

2012062820120628 20120628

E-SB-980-0.5-2E-SB-980-0-0.5 E-SB-980-2-3

2

20.5 3

0.50

TABLE 4-5



PAGE 13 OF 14

SAMPLE ID Non-




METALS (MG/KG)

ANTIMONY 3.1 41

ARSENIC 12(1) 12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51


COPPER 310 4100

LEAD 400 1000


NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

THALLIUM 0.55 7.2


ZINC 2300 31000











CHRYSENE 22000 390000



FLUORENE 310000 4100000




PYRENE 230000 3100000



















-- -- -- -- -- -- ---- -- -- -- -- -- --

29 J 110000 720000 6500 6000 8000 220

-- 20 J -- -- -- 47 J ---- 22 J -- -- -- 46 J ---- 100 -- -- -- 390 --

-- 15 J -- -- -- 48 J --

-- 200 77 -- -- 540 7.4

-- 1258.01 1213.82 -- -- 3631.4 81.273-- 920 790 J -- -- 3000 59

-- 940 910 -- -- 2700 60

-- 1500 1400 -- -- 4200 89

-- 740 790 -- -- 2200 52

-- 710 740 -- -- 2100 40

-- 910 920 J -- -- 3400 73

-- -- -- -- -- -- --

-- 2100 1500 -- -- 7000 120

-- 86 -- -- -- 290 --

-- 610 590 -- -- 1700 42

-- 25 J -- -- -- 58 J --

-- 1100 260 -- -- 3900 36

-- 1400 1100 -- -- 5000 95

E-SB-981-0.5-2E-SB-981-0-0.5 E-SB-981-2-3

20120628 20120628

E-SB-980-3-4

20120628

3 0.5

E-SB-981-3-3.5 E-SB-982-0.5-2E-SB-982-0-0.5

3 0.50 2

20120628 20120628 20120628 20120628

4 20.5 3 3.5 20.5

0

TABLE 4-5



PAGE 14 OF 14

SAMPLE ID Non-




METALS (MG/KG)

ANTIMONY 3.1 41

ARSENIC 12(1) 12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51


COPPER 310 4100

LEAD 400 1000


NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

THALLIUM 0.55 7.2


ZINC 2300 31000











CHRYSENE 22000 390000



FLUORENE 310000 4100000




PYRENE 230000 3100000



NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NANA NA

NA NA

NA NA

NA NANA NA

NA NA

NA NA

NA NA

NA NA

NA NA

NA NA

-- ---- ---- --

-- ---- ---- --

-- --

-- --

21.463 --15 L --

15 --

22 --

8.6 --

8.6 --

17 L -- 1 Site specific screening level.-- -- NA = CRITERION NOTE AVAILABLE OR NOT ANALYZED

18 L -- EXCEEDS BOTH CRITERIA-- -- EXCEEDS ONE CRITERION

8.6 -- L = Positive result biased low due to quality control noncompliance.-- -- J = Positive result estimated due to quality control noncompliance.-- -- "--" denotes nondetected result.

18 L -- B = Result is considered to be from laboratory blank contamination.

E-SB-982-3-4

20120628

E-SB-982-2-3

20120628

3

43

2

TABLE 4-6

BAPEQ EXCEEDANCES FOR BLOCK E PERIPHERAL SHALLOW-SOIL SAMPLES, JUNE-JULY, 2012


Sample Sample Top Sample BaPEq Screening

Boring Sample Date Depth Bottom Depth Concentration Level

Number ID yyyymmdd Feet Feet mg/kg Exceeded

E-SB-974 E-SB-974-0-0.5 20120629 0 0.5 45.37 NR

E-SB-976 E-SB-976-0-0.5 20120629 0 0.5 21.54 NR

E-SB-978 E-SB-978-0.5-2 20120629 0 0.5 12.38 NR

E-SB-965 E-SB-965-0-0.5 20120627 0 0.5 10.25 NR

E-SB-979 E-SB-979-0-0.5 20120628 0 0.5 8.28 NR

E-SB-977 E-SB-977-0-0.5 20120629 0 0.5 4.91 NR

E-SB-967 E-SB-967-0-0.5 20120627 0 0.5 4.78 NR

E-SB-973 E-SB-973-0-0.5 20120629 0 0.5 4.28 NR

E-SB-982 E-SB-982-0-0.5 20120628 0 0.5 3.63 NR

E-SB-980 E-SB-980-0-0.5 20120628 0 0.5 3.61 NR

E-SB-957 E-SB-957-0-0.5 20120628 0 0.5 3.47 NR

E-SB-964 S-SB-964-0-0.5 20120627 0 0.5 3.15 NR

E-SB-975 E-SB-975-0-0.5 20120629 0 0.5 2.795 R

E-SB-978 E-SB-978-0-0.5 20120629 0 0.5 2.03 R

E-SB-966 E-SB-966-0.5-2 20120627 0 2 1.49 R

E-SB-981 E-SB-981-0-0.5 20120628 0 0.5 1.26 R

E-SB-981 E-SB-981-0.5-2 20120628 0 2 1.21 R

E-SB-956 E-SB-956-0-0.5 20120628 0 0.5 1.213 R

E-SB-972 E-SB-972-0-0.5 20120629 0 0.5 1.13 R

E-SB-966 E-SB-966-2-3 20120627 2 3 1.02 R

E-SB-955 E-SB-955-0-0.5 20120629 0 0.5 0.755 R

E-SB-965 S-SB-965-2-3 20120627 2 3 0.377 R

E-SB-979 E-SB-979-3-4 20120628 3 4 0.362 R

E-SB-973 E-SB-973-2-3 20120629 2 3 0.322 R

E-SB-976 E-SB-976-0.5-2 20120629 0 2 0.250 R

E-SB-975 E-SB-975-3-4 20120629 3 4 0.246 R

E-SB-959 E-SB-959-0-0.5 20120628 0 0.5 0.236 R

E-SB-967 E-SB-967-0.5-2 20120627 0 2 0.221 R

E-SB-983 E-SB-983-0-2 20120719 0 2 0.188 R

E-SB-973 E-SB-973-0.5-2 20120629 0 2 0.175 R

BaPEq - benzo(a)pyrene equivalence R - residential screening level of 0.140 mg/kg

NR - non-residential screening level of 2.90 mg/kg yyyymmdd - year month day


TABLE 4-7

STATISTICAL SUMMARY OF ANALYTES DETECTED IN BLOCK E DEEP BORING SOIL SAMPLES, JUNE-JULY, 2012


PAGE 1 OF 2


Chemical (1)of Detection Non Non Detected Detected Maximum All Positive Deviation


Inorganics (mg/kg)

BARIUM 16/16 100 6.7 J 25 J E-CB-11A-18-20 12.91 12.91 4.20

BERYLLIUM 16/16 100 0.35 J 13 E-CB-11A-10-12 3.04 3.04 3.28

CHROMIUM 16/16 100 8.3 44 E-CB-11A-18-20 17.27 17.27 8.47

COBALT 16/16 100 3.2 94 E-CB-11B-6-8 15.08 15.08 22.01

COPPER 16/16 100 3 47 E-CB-11B-6-8 12.87 12.87 9.84

LEAD 16/16 100 2.3 16 E-CB-11A-18-20 5.64 5.64 3.74

NICKEL 16/16 100 6.5 62 E-CB-13-22-24 26.85 26.85 19.14

VANADIUM 16/16 100 13 77 E-CB-11A-18-20 28.44 28.44 19.43

ZINC 16/16 100 8.4 81 E-CB-11B-6-8 35.09 35.09 24.43

ARSENIC 15/16 94 1.5 1.5 0.53 J 4.4

E-CB-2-12-14 and

E-CB-11B-6-8 1.72 1.79 1.527

SILVER 3/16 19 0.084 0.51 0.087 J 0.22 J E-CB-13-22-24 0.104 0.152 0.083

MOLYBDENUM 2/16 13 0.23 1.4 0.33 J 0.44 J E-CB-2-26-28 0.263 0.385 0.212

CADMIUM 1/16 6 0.028 0.19 0.043 J 0.043 J E-CB-2-12-14 0.037 0.043 0.032

SELENIUM 1/16 6 0.35 2.3 0.56 J 0.56 J E-CB-13-22-24 0.404 0.560 0.357

Volatile Organics (ug/kg)

ACETONE 11/20 55 5.5 5400 10 J 52 E-SB-983-0-2 283 22 810

1,2,4-TRICHLOROBENZENE 5/20 25 0.24 0.43 2.1 J 310000 E-SB-984-4-6 26005 104018 81652

2-BUTANONE 5/20 25 1.2 1400 1.4 J 3100 J E-SB-984-4-6 192 622 702

TOLUENE 5/20 25 0.24 540 0.24 J 23 J E-CB-2-12-14 28 5 81

1,2,3-TRICHLOROBENZENE 4/20 20 0.33 0.6 11 J 69000 E-SB-984-4-6 5801 29006 18205

1,4-DICHLOROBENZENE 3/20 15 0.55 8.4 3.4 J 3700 J E-SB-984-4-6 306 2034 962

1,2-DICHLOROBENZENE 2/20 10 0.3 2100 2.1 J 3100 J E-SB-984-4-6 208 1551 720

1,2-DICHLOROETHANE 2/20 10 0.28 320 210 300 E-CB-2-12-14 41 255 89

1,3-DICHLOROBENZENE 2/20 10 0.29 5 200 J 320 J E-SB-984-4-6 26 260 82

CHLOROBENZENE 2/20 10 0.27 200 130 270 E-CB-2-12-14 30 200 69

NAPHTHALENE 2/20 10 0.16 7 470 J 770 J E-SB-984-4-6 62 620 197

TETRACHLOROETHENE 2/20 10 0.43 13 530 J 710 J E-SB-984-4-6 63 620 193

TOTAL XYLENES 2/20 10 0.55 8.5 260 J 370 J E-SB-984-4-6 32 315 98

TRICHLOROETHENE 2/20 10 0.35 310 1 J 340 J E-SB-984-4-6 25 171 82

1,2-DICHLOROPROPANE 1/20 5 0.57 260 1.5 J 1.5 J E-CB-2-10-12 13 2 39

ETHYLBENZENE 1/20 5 0.21 170 180 J 180 J E-SB-984-4-6 14 180 44

METHYLENE CHLORIDE 1/20 5 0.55 2500 300 300 E-CB-2-12-14 138 300 378

STYRENE 1/20 5 0.12 180 280 J 280 J E-SB-984-4-6 19 280 65

PAHs (ug/kg)

FLUORANTHENE 12/42 29 3.6 4.3 8.3 370 E-SB-983-0-2 18.1 58.4 57.9

PYRENE 8/42 19 3.6 4.3 6 J 230 E-SB-983-0-2 10.9 48.9 37.2

BAP EQUIVALENT-HALFND 6/42 14 3.6 4.3 6.5752 188.31 E-SB-983-0-2 9.3 53.5 30.8

BENZO(A)ANTHRACENE 6/42 14 3.6 4.3 5.1 J 170 E-SB-983-0-2 8.3 46.3 27.5

TABLE 4-7

STATISTICAL SUMMARY OF ANALYTES DETECTED IN BLOCK E DEEP BORING SOIL SAMPLES, JUNE-JULY, 2012


PAGE 2 OF 2


Chemical (1)of Detection Non Non Detected Detected Maximum All Positive Deviation


BENZO(B)FLUORANTHENE 6/42 14 3.6 4.3 5.4 J 190 E-SB-983-0-2 9.4 53.7 31.6

CHRYSENE 6/42 14 1.2 1.4 5.7 J 160 E-SB-983-0-2 7.4 48.0 27.4

INDENO(1,2,3-CD)PYRENE 6/42 14 3.6 4.3 11 92 E-SB-983-0-2 6.3 32.7 15.2

BENZO(A)PYRENE 5/42 12 3.6 4.3 4.3 J 140 E-SB-983-0-2 7.1 45.1 22.7

BENZO(G,H,I)PERYLENE 5/42 12 3.6 4.3 4.8 J 93 E-SB-983-0-2 5.8 34.0 15.9

PHENANTHRENE 5/42 12 3.6 4.3 12 160 E-SB-983-0-2 7.1 45.2 24.6

BENZO(K)FLUORANTHENE 4/42 10 3.6 4.3 7.7 J 100 E-SB-983-0-2 5.7 41.2 16.4

ANTHRACENE 2/42 5 3.6 4.3 9.2 33 E-SB-983-0-2 2.9 21.1 4.9

NAPHTHALENE 2/42 5 3.6 4.3 4.7 J 18 E-CB-2-38-40 2.4 11.4 2.5

ACENAPHTHENE 1/42 2 3.6 4.3 15 15 E-SB-983-0-2 2.3 15.0 2.0

FLUORENE 1/42 2 3.6 4.3 9.5 9.5 E-SB-983-0-2 2.1 9.5 1.2

PCBs (ug/kg)

AROCLOR-1260 17/93 18 19 25 32 J 1700000 E-SB-984-4-6 24884 136086 182891

Petroleum Hydrocarbons

TPH-GRO (C06-C10) (ug/kg) 1/18 6 50 UJ 20000 U 180 180 E-CB-2-12-14 623 180 2417

TPH-DRO (C10-C32) (mg/kg) 1/18 6 10 UJ 1000 B 11 J 11 J E-CB-11A-10-12 55 11 141

1 Chemicals not detected in any of the samples are not shown on this table.

B = Result considered to be from laboratory blank contamination.

J = Positive result estimated due to quality control noncompliance.

UJ = Analyte not detected. Detection limit is estimated due to technical noncompliance.


ug/kg - micrograms per kilogram

Footnotes:



Associated Samples

E-CB-11A-0-2 20120720 E-CB-13-0-2 20120720 E-CB-11B-0-2 20120719 E-CB-2-0-2 20120719 E-SB-983-0-2 20120719 E-SB-984-0-2 20120724














E-CB-11A-42-44 20120720 E-CB-13-40-42 20120720 E-CB-2-42-44 20120719

E-CB-11A-46-48 20120720 E-CB-13-42-44 20120720 E-CB-2-46-48 20120719

E-CB-11A-48-50 20120720 E-CB-13-44-46 20120720 E-CB-2-48-50 20120719

TABLE 4-8

ANALYTES DETECTED IN BLOCK E DEEP BORING SOIL SAMPLES, JUNE-JULY 2012


PAGE 1 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1) NA NA NA NA NA NA

BARIUM 1600 20000 NA NA NA NA NA NA

BERYLLIUM 16 200 NA NA NA NA NA NA

CADMIUM 3.9 51 NA NA NA NA NA NA

CHROMIUM 23 310 NA NA NA NA NA NA

COBALT NA NA NA NA NA NA NA NA

COPPER 310 4100 NA NA NA NA NA NA

LEAD 400 1000 NA NA NA NA NA NA

MOLYBDENUM NA NA NA NA NA NA NA NA

NICKEL 160 2000 NA NA NA NA NA NA

SELENIUM 39 510 NA NA NA NA NA NA

SILVER 39 510 NA NA NA NA NA NA

VANADIUM 91(1)

91(1) NA NA NA NA NA NA

ZINC 2300 31000 NA NA NA NA NA NA

PCBS (UG/KG)AROCLOR-1260 1000 10000 70 -- -- -- -- --

TPH-DRO 230 620 NA NA NA NA NA NA

TPH-GRO 230000 620000 NA NA NA NA NA NA

ACENAPHTHENE 470000 6100000 -- -- -- -- -- NA

ANTHRACENE 2300000 31000000 -- -- -- -- -- NA

BAP EQUIVALENT-HALFND 140(1)

2900(1) 9.2772 -- -- -- -- NA

BENZO(A)ANTHRACENE 220 3900 5.5 J -- -- -- -- NA

BENZO(A)PYRENE 22 390 4.3 J -- -- -- -- NA

BENZO(B)FLUORANTHENE 220 3900 7 J -- -- -- -- NA

BENZO(G,H,I)PERYLENE 230000 3100000 4.8 J -- -- -- -- NA

BENZO(K)FLUORANTHENE 2200 39000 -- -- -- -- -- NA

CHRYSENE 22000 390000 7.2 J -- -- -- -- NA

FLUORANTHENE 310000 4100000 31 -- -- -- -- NA

FLUORENE 310000 4100000 -- -- -- -- -- NA

INDENO(1,2,3-CD)PYRENE 220 3900 17 -- -- -- -- NA

NAPHTHALENE 160000 2000000 -- -- -- -- -- NA

PHENANTHRENE 2300000 31000000 12 -- -- -- -- NA

PYRENE 230000 3100000 8 J -- -- -- -- NA


PETROLEUM HYDROCARBONS (UG/KG)

PETROLEUM HYDROCARBONS (MG/KG)

E-CB-2-0-2 E-CB-2-10-12E-CB-2-4-6 E-CB-2-6-8E-CB-2-2-4 E-CB-2-8-10

20120719 201207192012071920120719 20120719 20120719

0 102 4 6 8

2 1264 8 10

TABLE 4-8



PAGE 2 OF 32

SAMPLE ID Non-




E-CB-2-0-2 E-CB-2-10-12E-CB-2-4-6 E-CB-2-6-8E-CB-2-2-4 E-CB-2-8-10

20120719 201207192012071920120719 20120719 20120719

0 102 4 6 8

2 1264 8 10

VOLATILES (UG/KG)1,2,3-TRICHLOROBENZENE 29000 NA NA NA NA NA NA 13

1,2,4-TRICHLOROBENZENE 38000 175000 NA NA NA NA NA 51

1,2-DICHLOROBENZENE 700000 9200000 NA NA NA NA NA 2.1 J

1,2-DICHLOROETHANE 7000 31000 NA NA NA NA NA 210

1,2-DICHLOROPROPANE 9400 42000 NA NA NA NA NA 1.5 J

1,3-DICHLOROBENZENE 23000 310000 NA NA NA NA NA --

1,4-DICHLOROBENZENE 31000 NA NA NA NA NA NA 3.4 J

1-BUTANOL NA NA NA NA NA NA NA NA

2-BUTANONE 4700000 61000000 NA NA NA NA NA --

ACETONE 7000000 92000000 NA NA NA NA NA --

CHLOROBENZENE 160000 2000000 NA NA NA NA NA 130

CYCLOHEXANONE NA NA NA NA NA NA NA NA

DIETHYL ETHER NA NA NA NA NA NA NA NA

ETHYLBENZENE 780000 10000000 NA NA NA NA NA --

HEXANE NA NA NA NA NA NA NA NA

METHYL ACETATE NA NA NA NA NA NA NA NA

METHYLENE CHLORIDE 85000 380000 NA NA NA NA NA --

NAPHTHALENE 160000 2000000 NA NA NA NA NA --

STYRENE 1600000 20000000 NA NA NA NA NA --

TETRACHLOROETHENE 1200 5300 NA NA NA NA NA --

TOLUENE 630000 8200000 NA NA NA NA NA --

TOTAL XYLENES 1600000 20000000 NA NA NA NA NA --

TRANS-1,4-DICHLORO-2-BUTENE NA NA NA NA NA NA NA NA

TRICHLOROETHENE 1600 7200 NA NA NA NA NA 1 J

TABLE 4-8



PAGE 3 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310

COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

VANADIUM 91(1)

91(1)

ZINC 2300 31000PCBS (UG/KG)AROCLOR-1260 1000 10000

TPH-DRO 230 620

TPH-GRO 230000 620000


ANTHRACENE 2300000 31000000


2900(1)






CHRYSENE 22000 390000


FLUORENE 310000 4100000




PYRENE 230000 3100000




4.4 NA NA 0.53 J NA NA

13 J NA NA 12 J NA NA

2.7 NA NA 1 NA NA

0.043 J NA NA -- NA NA

19 NA NA 17 NA NA

14 NA NA 4 NA NA

12 NA NA 3 NA NA

6.1 NA NA 2.8 NA NA

-- NA NA 0.44 J NA NA

39 NA NA 13 NA NA

-- NA NA -- NA NA

0.15 J NA NA 0.087 J NA NA

29 NA NA 13 NA NA

44 NA NA 8.4 NA NA

-- -- -- -- -- --

13 B NA NA 14 B NA NA

180 NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

E-CB-2-12-14 E-CB-2-16-18 E-CB-2-22-24 E-CB-2-26-28 E-CB-2-28-30 E-CB-2-32-34

20120719 20120719 20120719 20120719 20120719 20120719

12 16 26 28 3222

14 18 24 28 30 34

TABLE 4-8



PAGE 4 OF 32

SAMPLE ID Non-




VOLATILES (UG/KG)1,2,3-TRICHLOROBENZENE 29000 NA

1,2,4-TRICHLOROBENZENE 38000 175000

1,2-DICHLOROBENZENE 700000 9200000

1,2-DICHLOROETHANE 7000 31000

1,2-DICHLOROPROPANE 9400 42000

1,3-DICHLOROBENZENE 23000 3100001,4-DICHLOROBENZENE 31000 NA

1-BUTANOL NA NA

2-BUTANONE 4700000 61000000

ACETONE 7000000 92000000

CHLOROBENZENE 160000 2000000CYCLOHEXANONE NA NA

DIETHYL ETHER NA NA

ETHYLBENZENE 780000 10000000HEXANE NA NA

METHYL ACETATE NA NA

METHYLENE CHLORIDE 85000 380000


STYRENE 1600000 20000000

TETRACHLOROETHENE 1200 5300

TOLUENE 630000 8200000

TOTAL XYLENES 1600000 20000000TRANS-1,4-DICHLORO-2-BUTENE NA NA

TRICHLOROETHENE 1600 7200

E-CB-2-12-14 E-CB-2-16-18 E-CB-2-22-24 E-CB-2-26-28 E-CB-2-28-30 E-CB-2-32-34

20120719 20120719 20120719 20120719 20120719 20120719

12 16 26 28 3222

14 18 24 28 30 34

11 J NA NA -- NA NA

37 J NA NA -- NA NA

-- NA NA -- NA NA

300 NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

2100 NJ NA NA NA NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

270 NA NA -- NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

-- NA NA -- NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

300 NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

-- NA NA -- NA NA

23 J NA NA -- NA NA

-- NA NA -- NA NA

NA NA NA NA NA NA

-- NA NA -- NA NA

TABLE 4-8



PAGE 5 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310

COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

VANADIUM 91(1)

91(1)


TPH-DRO 230 620

TPH-GRO 230000 620000


ANTHRACENE 2300000 31000000


2900(1)






CHRYSENE 22000 390000


FLUORENE 310000 4100000




PYRENE 230000 3100000




NA 0.78 J NA NA 0.55 J NA


NA 0.68 NA NA 0.35 J NA

NA -- NA NA -- NA

NA 10 NA NA 13 NA

NA 4.3 NA NA 3.2 NA

NA 6.6 NA NA 3.9 NA

NA 2.3 NA NA 2.4 NA

NA -- NA NA -- NA

NA 10 NA NA 6.5 NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA 15 NA NA 14 NA

NA 14 NA NA 10 NA

-- -- -- -- -- --

NA 15 B NA NA 17 B NA

NA -- NA NA -- NA

NA -- NA NA -- --

NA -- NA NA -- --

NA -- NA NA -- --

NA -- NA NA -- --

NA -- NA NA -- --

NA -- NA NA -- --

NA -- NA NA -- --

NA -- NA NA -- --

NA -- NA NA -- --

NA -- NA NA -- --

NA -- NA NA -- --

NA -- NA NA -- --

NA 18 NA NA -- --

NA -- NA NA -- --

NA -- NA NA -- --

E-CB-11A-0-2

0

E-CB-2-46-48 E-CB-2-48-50E-CB-2-36-38 E-CB-2-38-40 E-CB-2-42-44

2012072020120719 2012071920120719 20120719 20120719

36 38 42 46 48

248 5038 40 44

TABLE 4-8



PAGE 6 OF 32

SAMPLE ID Non-










1-BUTANOL NA NA

2-BUTANONE 4700000 61000000

ACETONE 7000000 92000000


DIETHYL ETHER NA NA





STYRENE 1600000 20000000


TOLUENE 630000 8200000



E-CB-11A-0-2

0

E-CB-2-46-48 E-CB-2-48-50E-CB-2-36-38 E-CB-2-38-40 E-CB-2-42-44

2012072020120719 2012071920120719 20120719 20120719

36 38 42 46 48

248 5038 40 44

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA NA NA NA NA NA

NA -- NA NA 1.4 J NA

NA -- NA NA 24 NA

NA -- NA NA -- NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA -- NA NA -- NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA NA NA NA NA NA

NA -- NA NA -- NA

TABLE 4-8



PAGE 7 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310

COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

VANADIUM 91(1)

91(1)


TPH-DRO 230 620

TPH-GRO 230000 620000


ANTHRACENE 2300000 31000000


2900(1)






CHRYSENE 22000 390000


FLUORENE 310000 4100000




PYRENE 230000 3100000




NA NA NA NA -- NA

NA NA NA NA 15 J NA

NA NA NA NA 13 NA

NA NA NA NA -- NA

NA NA NA NA 19 NA

NA NA NA NA 13 NA

NA NA NA NA 13 NA

NA NA NA NA 6.4 NA

NA NA NA NA -- NA

NA NA NA NA 40 NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA 26 NA

NA NA NA NA 66 NA

-- 160 34 J 39 J 70 --

NA NA NA NA 11 J NA

NA NA NA NA -- NA

-- -- -- -- -- NA

-- 9.2 -- -- -- NA

-- 78.842 -- 19.529 -- NA

-- 66 -- 16 -- NA

-- 57 -- 13 -- NA

-- 88 -- 17 -- NA

-- 52 -- 12 -- NA

-- 46 -- 11 -- NA

-- 82 -- 19 -- NA

-- 86 -- 21 8.3 NA

-- -- -- -- -- NA

-- 38 -- 11 -- NA

-- -- -- -- -- NA

-- 26 -- -- -- NA

-- 88 8.6 20 9.3 NA

E-CB-11A-10-12 E-CB-11A-12-14E-CB-11A-2-4 E-CB-11A-4-6 E-CB-11A-6-8 E-CB-11A-8-10

20120720 20120720 2012072020120720 20120720 20120720

2 4 10 1286

12 144 6 8 10

TABLE 4-8



PAGE 8 OF 32

SAMPLE ID Non-










1-BUTANOL NA NA

2-BUTANONE 4700000 61000000

ACETONE 7000000 92000000


DIETHYL ETHER NA NA





STYRENE 1600000 20000000


TOLUENE 630000 8200000



E-CB-11A-10-12 E-CB-11A-12-14E-CB-11A-2-4 E-CB-11A-4-6 E-CB-11A-6-8 E-CB-11A-8-10

20120720 20120720 2012072020120720 20120720 20120720

2 4 10 1286

12 144 6 8 10

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA NA NA

NA NA NA NA -- NA

NA NA NA NA 10 J NA

NA NA NA NA -- NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA -- NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA NA NA

NA NA NA NA -- NA

TABLE 4-8



PAGE 9 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310

COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

VANADIUM 91(1)

91(1)


TPH-DRO 230 620

TPH-GRO 230000 620000


ANTHRACENE 2300000 31000000


2900(1)






CHRYSENE 22000 390000


FLUORENE 310000 4100000




PYRENE 230000 3100000




NA 4.3 J NA NA NA 1.7 L

NA 25 J NA NA NA 11 J

NA 5.3 NA NA NA 2.2

NA -- NA NA NA --

NA 44 NA NA NA 15

NA 25 NA NA NA 8.9

NA 14 NA NA NA 8.2

NA 16 NA NA NA 5.2

NA -- NA NA NA --

NA 60 NA NA NA 23

NA -- NA NA NA --

NA -- NA NA NA --

NA 77 NA NA NA 22

NA 59 NA NA NA 30

-- -- -- -- -- --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

E-CB-11A-16-18 E-CB-11A-18-20 E-CB-11A-32-34 E-CB-11A-36-38E-CB-11A-22-24 E-CB-11A-26-28

20120720 20120720 20120720 20120720 2012072020120720

26 3216 18 22 36

18 20 24 28 34 38

TABLE 4-8



PAGE 10 OF 32

SAMPLE ID Non-










1-BUTANOL NA NA

2-BUTANONE 4700000 61000000

ACETONE 7000000 92000000


DIETHYL ETHER NA NA





STYRENE 1600000 20000000


TOLUENE 630000 8200000



E-CB-11A-16-18 E-CB-11A-18-20 E-CB-11A-32-34 E-CB-11A-36-38E-CB-11A-22-24 E-CB-11A-26-28

20120720 20120720 20120720 20120720 2012072020120720

26 3216 18 22 36

18 20 24 28 34 38

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA NA NA NA NA NA

NA -- NA NA NA --

NA 13 J NA NA NA 21

NA -- NA NA NA --

NA NA NA NA NA NA

NA NA NA NA NA NA

NA -- NA NA NA --

NA NA NA NA NA NA

NA NA NA NA NA NA

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA --

NA -- NA NA NA 0.4 J

NA -- NA NA NA --

NA NA NA NA NA NA

NA -- NA NA NA --

TABLE 4-8



PAGE 11 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310

COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

VANADIUM 91(1)

91(1)


TPH-DRO 230 620

TPH-GRO 230000 620000


ANTHRACENE 2300000 31000000


2900(1)






CHRYSENE 22000 390000


FLUORENE 310000 4100000




PYRENE 230000 3100000




NA NA 1.5 L NA NA NA

NA NA 14 J NA NA NA

NA NA 2.5 NA NA NA

NA NA -- NA NA NA

NA NA 15 NA NA NA

NA NA 8.7 NA NA NA

NA NA 15 NA NA NA

NA NA 5.7 NA NA NA

NA NA 0.33 J NA NA NA

NA NA 19 NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA 21 NA NA NA

NA NA 32 NA NA NA

-- -- -- -- -- --

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

E-CB-11A-42-44 E-CB-11A-46-48 E-CB-11A-48-50 E-CB-11B-2-4E-CB-11B-0-2E-CB-11A-38-40

2012071920120720 20120720 2012071920120720 20120720

46 48 0 238 42

44 448 50 240

TABLE 4-8



PAGE 12 OF 32

SAMPLE ID Non-










1-BUTANOL NA NA

2-BUTANONE 4700000 61000000

ACETONE 7000000 92000000


DIETHYL ETHER NA NA





STYRENE 1600000 20000000


TOLUENE 630000 8200000



E-CB-11A-42-44 E-CB-11A-46-48 E-CB-11A-48-50 E-CB-11B-2-4E-CB-11B-0-2E-CB-11A-38-40

2012071920120720 20120720 2012071920120720 20120720

46 48 0 238 42

44 448 50 240

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA NA NA NA NA

NA NA -- NA NA NA

NA NA 24 NA NA NA

NA NA -- NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA -- NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA -- NA NA NA

NA NA 0.35 J NA NA NA

NA NA -- NA NA NA

NA NA NA NA NA NA

NA NA -- NA NA NA

TABLE 4-8



PAGE 13 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310

COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

VANADIUM 91(1)

91(1)


TPH-DRO 230 620

TPH-GRO 230000 620000


ANTHRACENE 2300000 31000000


2900(1)






CHRYSENE 22000 390000


FLUORENE 310000 4100000




PYRENE 230000 3100000





NA 16 J NA NA 14 J NA

NA 7 NA NA 2.1 NA

NA -- NA NA -- NA

NA 24 NA NA 14 NA

NA 94 NA NA 17 NA

NA 47 NA NA 14 NA

NA 10 NA NA 3.8 NA

NA -- NA NA -- NA

NA 58 NA NA 26 NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA 51 NA NA 17 NA

NA 81 NA NA 52 NA

-- -- -- -- -- --

NA 19 B NA NA 17 B NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

E-CB-11B-12-14 E-CB-11B-16-18 E-CB-11B-18-20E-CB-11B-4-6 E-CB-11B-6-8 E-CB-11B-8-10

2012071920120719 20120719 2012071920120719 20120719

12 1686 184

6 14 18 208 10

TABLE 4-8



PAGE 14 OF 32

SAMPLE ID Non-










1-BUTANOL NA NA

2-BUTANONE 4700000 61000000

ACETONE 7000000 92000000


DIETHYL ETHER NA NA





STYRENE 1600000 20000000


TOLUENE 630000 8200000



E-CB-11B-12-14 E-CB-11B-16-18 E-CB-11B-18-20E-CB-11B-4-6 E-CB-11B-6-8 E-CB-11B-8-10

2012071920120719 20120719 2012071920120719 20120719

12 1686 184

6 14 18 208 10

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA NA NA NA NA NA


NA 20 NA NA 48 NA

NA -- NA NA -- NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA -- NA NA -- NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA -- NA NA -- NA

NA NA NA NA NA NA

NA -- NA NA -- NA

TABLE 4-8



PAGE 15 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310

COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

VANADIUM 91(1)

91(1)


TPH-DRO 230 620

TPH-GRO 230000 620000


ANTHRACENE 2300000 31000000


2900(1)






CHRYSENE 22000 390000


FLUORENE 310000 4100000




PYRENE 230000 3100000




NA NA 1.1 J NA NA 0.55 J

NA NA 13 J NA NA 8.2 J

NA NA 1.7 NA NA 0.7

NA NA -- NA NA --

NA NA 16 NA NA 8.3

NA NA 9.3 NA NA 3.3

NA NA 11 NA NA 12

NA NA 3.2 NA NA 3.2

NA NA -- NA NA --

NA NA 24 NA NA 8.2

NA NA -- NA NA --

NA NA -- NA NA --

NA NA 20 NA NA 17

NA NA 21 NA NA 12

-- -- -- -- -- --

NA NA 18 B NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

E-CB-11B-26-28 E-CB-11B-28-30 E-CB-11B-32-34 E-CB-11B-36-38 E-CB-11B-38-40E-CB-11B-22-24

20120719 20120719 20120719 20120719 20120719 20120719

36 3828 3222 26

24 28 30 34 38 40

TABLE 4-8



PAGE 16 OF 32

SAMPLE ID Non-










1-BUTANOL NA NA

2-BUTANONE 4700000 61000000

ACETONE 7000000 92000000


DIETHYL ETHER NA NA





STYRENE 1600000 20000000


TOLUENE 630000 8200000



E-CB-11B-26-28 E-CB-11B-28-30 E-CB-11B-32-34 E-CB-11B-36-38 E-CB-11B-38-40E-CB-11B-22-24

20120719 20120719 20120719 20120719 20120719 20120719

36 3828 3222 26

24 28 30 34 38 40

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA NA NA NA NA

NA NA -- NA NA --

NA NA -- NA NA 13 J

NA NA -- NA NA --

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA -- NA NA --

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA -- NA NA --

NA NA NA NA NA NA

NA NA -- NA NA --

TABLE 4-8



PAGE 17 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310

COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

VANADIUM 91(1)

91(1)


TPH-DRO 230 620

TPH-GRO 230000 620000


ANTHRACENE 2300000 31000000


2900(1)






CHRYSENE 22000 390000


FLUORENE 310000 4100000




PYRENE 230000 3100000




NA NA NA NA 1.4 J NA

NA NA NA NA 15 J NA

NA NA NA NA 1.4 NA

NA NA NA NA -- NA

NA NA NA NA 20 NA

NA NA NA NA 5.8 NA

NA NA NA NA 9.2 NA

NA NA NA NA 5 NA

NA NA NA NA -- NA

NA NA NA NA 15 NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA 31 NA

NA NA NA NA 23 J NA

-- -- -- -- -- --

NA NA NA NA -- NA

NA NA NA NA -- NA

-- -- -- -- -- NA

-- -- -- -- -- NA

-- -- 6.5752 -- -- NA

-- -- 5.1 J -- -- NA

-- -- -- -- -- NA

-- -- 5.4 J -- -- NA

-- -- -- -- -- NA

-- -- -- -- -- NA

-- -- 5.7 J -- -- NA

24 -- 28 -- -- NA

-- -- -- -- -- NA

-- -- 16 -- -- NA

-- -- -- -- -- NA

-- -- -- -- -- NA

-- -- 6 J -- -- NA

E-CB-13-2-4E-CB-13-0-2 E-CB-13-4-6 E-CB-13-6-8 E-CB-13-10-12 E-CB-13-14-16

20120720 2012072020120720 201207202012072020120720

2 10 144 60

12 166 842

TABLE 4-8



PAGE 18 OF 32

SAMPLE ID Non-










1-BUTANOL NA NA

2-BUTANONE 4700000 61000000

ACETONE 7000000 92000000


DIETHYL ETHER NA NA





STYRENE 1600000 20000000


TOLUENE 630000 8200000



E-CB-13-2-4E-CB-13-0-2 E-CB-13-4-6 E-CB-13-6-8 E-CB-13-10-12 E-CB-13-14-16

20120720 2012072020120720 201207202012072020120720

2 10 144 60

12 166 842

NA NA NA NA 0.5 B NA


NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA NA NA

NA NA NA NA -- NA

NA NA NA NA 11 J NA

NA NA NA NA -- NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA -- NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA -- NA

NA NA NA NA -- NA


NA NA NA NA -- NA

NA NA NA NA NA NA

NA NA NA NA -- NA

TABLE 4-8



PAGE 19 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310

COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

VANADIUM 91(1)

91(1)


TPH-DRO 230 620

TPH-GRO 230000 620000


ANTHRACENE 2300000 31000000


2900(1)






CHRYSENE 22000 390000


FLUORENE 310000 4100000




PYRENE 230000 3100000




NA 3.7 NA NA NA NA

NA 13 J NA NA NA NA

NA 5.5 NA NA NA NA

NA -- NA NA NA NA

NA 22 NA NA NA NA

NA 20 NA NA NA NA

NA 16 NA NA NA NA

NA 11 NA NA NA NA

NA -- NA NA NA NA

NA 62 NA NA NA NA

NA 0.56 J NA NA NA NA

NA 0.22 J NA NA NA NA

NA 67 NA NA NA NA

NA 75 NA NA NA NA

-- -- -- -- -- --

NA -- NA NA NA NA

NA -- NA NA NA NA

NA -- -- NA NA NA

NA -- -- NA NA NA

NA -- -- NA NA NA

NA -- -- NA NA NA

NA -- -- NA NA NA

NA -- -- NA NA NA

NA -- -- NA NA NA

NA -- -- NA NA NA

NA -- -- NA NA NA

NA -- -- NA NA NA

NA -- -- NA NA NA

NA -- -- NA NA NA

NA -- -- NA NA NA

NA -- -- NA NA NA

NA -- -- NA NA NA

E-CB-13-8-10 E-CB-13-24-26 E-CB-13-28-30 E-CB-13-32-34E-CB-13-18-20 E-CB-13-22-24

20120720 20120720 20120720 2012072020120720 20120720

818 22 24 28 32

20 24 26 3010 34

TABLE 4-8



PAGE 20 OF 32

SAMPLE ID Non-










1-BUTANOL NA NA

2-BUTANONE 4700000 61000000

ACETONE 7000000 92000000


DIETHYL ETHER NA NA





STYRENE 1600000 20000000


TOLUENE 630000 8200000



E-CB-13-8-10 E-CB-13-24-26 E-CB-13-28-30 E-CB-13-32-34E-CB-13-18-20 E-CB-13-22-24

20120720 20120720 20120720 2012072020120720 20120720

818 22 24 28 32

20 24 26 3010 34

NA -- NA NA NA NA

NA -- NA NA NA NA

NA -- NA NA NA NA

NA -- NA NA NA NA

NA -- NA NA NA NA

NA -- NA NA NA NA

NA -- NA NA NA NA

NA NA NA NA NA NA

NA -- NA NA NA NA

NA -- NA NA NA NA

NA -- NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA -- NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA -- NA NA NA NA

NA -- NA NA NA NA

NA -- NA NA NA NA

NA -- NA NA NA NA

NA -- NA NA NA NA

NA -- NA NA NA NA

NA NA NA NA NA NA

NA -- NA NA NA NA

TABLE 4-8



PAGE 21 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310

COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

VANADIUM 91(1)

91(1)


TPH-DRO 230 620

TPH-GRO 230000 620000


ANTHRACENE 2300000 31000000


2900(1)






CHRYSENE 22000 390000


FLUORENE 310000 4100000




PYRENE 230000 3100000




0.66 J NA NA NA 0.63 J NA

12 J NA NA NA 11 J NA

1.4 NA NA NA 1.1 NA

-- NA NA NA -- NA

10 NA NA NA 10 NA

6.1 NA NA NA 4.7 NA

11 NA NA NA 10 NA

3.5 NA NA NA 3.6 NA

-- NA NA NA -- NA

16 NA NA NA 9.9 NA

-- NA NA NA -- NA

-- NA NA NA -- NA

17 NA NA NA 18 NA

19 NA NA NA 15 NA

-- -- -- -- -- 81

-- NA NA NA -- NA

-- NA NA NA -- NA

-- NA NA NA -- 15

-- NA NA NA -- 33

-- NA NA NA -- 188.31

-- NA NA NA -- 170

-- NA NA NA -- 140

-- NA NA NA -- 190

-- NA NA NA -- 93

-- NA NA NA -- 100

-- NA NA NA -- 160

-- NA NA NA -- 370

-- NA NA NA -- 9.5

-- NA NA NA -- 92

-- NA NA NA -- --

-- NA NA NA -- 160

-- NA NA NA -- 230

E-CB-13-42-44 E-CB-13-44-46E-CB-13-36-38 E-CB-13-38-40 E-CB-13-40-42 E-SB-983-0-2

20120720 2012071920120720 20120720 20120720 20120720

4238 40 44 036

46 238 40 42 44

TABLE 4-8



PAGE 22 OF 32

SAMPLE ID Non-










1-BUTANOL NA NA

2-BUTANONE 4700000 61000000

ACETONE 7000000 92000000


DIETHYL ETHER NA NA





STYRENE 1600000 20000000


TOLUENE 630000 8200000



E-CB-13-42-44 E-CB-13-44-46E-CB-13-36-38 E-CB-13-38-40 E-CB-13-40-42 E-SB-983-0-2

20120720 2012071920120720 20120720 20120720 20120720

4238 40 44 036

46 238 40 42 44

-- NA NA NA -- --

-- NA NA NA -- --

-- NA NA NA -- --

-- NA NA NA -- --

-- NA NA NA -- --

-- NA NA NA -- --

-- NA NA NA -- --

NA NA NA NA NA NA

-- NA NA NA -- 1.9 J

11 J NA NA NA -- 52

-- NA NA NA -- --

NA NA NA NA NA NA

NA NA NA NA NA NA

-- NA NA NA -- --

NA NA NA NA NA NA

NA NA NA NA NA NA

-- NA NA NA -- --

-- NA NA NA -- --

-- NA NA NA -- --

-- NA NA NA -- --

-- NA NA NA 0.37 J --

-- NA NA NA -- --

NA NA NA NA NA NA

-- NA NA NA -- --

TABLE 4-8



PAGE 23 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310

COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

VANADIUM 91(1)

91(1)


TPH-DRO 230 620

TPH-GRO 230000 620000


ANTHRACENE 2300000 31000000


2900(1)






CHRYSENE 22000 390000


FLUORENE 310000 4100000




PYRENE 230000 3100000




NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

-- -- -- -- -- --

NA NA NA NA NA NA

NA NA NA NA NA NA

-- -- -- -- NA NA

-- -- -- -- NA NA

-- 18.441 -- -- NA NA

-- 15 -- -- NA NA

-- 11 -- -- NA NA

-- 15 -- -- NA NA

-- 8.1 J -- -- NA NA

-- 7.7 J -- -- NA NA

-- 14 -- -- NA NA

22 49 22 21 NA NA

-- -- -- -- NA NA

-- 22 -- -- NA NA

4.7 J -- -- -- NA NA

-- 13 -- -- NA NA

-- 21 -- -- NA NA

E-SB-983-2-4 E-SB-983-10-12 E-SB-983-12-14E-SB-983-4-6 E-SB-983-6-8 E-SB-983-8-10

20120719 20120719 2012071920120719 2012071920120719

2 10 124 6 8

4 6 12 148 10

TABLE 4-8



PAGE 24 OF 32

SAMPLE ID Non-










1-BUTANOL NA NA

2-BUTANONE 4700000 61000000

ACETONE 7000000 92000000


DIETHYL ETHER NA NA





STYRENE 1600000 20000000


TOLUENE 630000 8200000



E-SB-983-2-4 E-SB-983-10-12 E-SB-983-12-14E-SB-983-4-6 E-SB-983-6-8 E-SB-983-8-10

20120719 20120719 2012071920120719 2012071920120719

2 10 124 6 8

4 6 12 148 10

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

TABLE 4-8



PAGE 25 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310

COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

VANADIUM 91(1)

91(1)


TPH-DRO 230 620

TPH-GRO 230000 620000


ANTHRACENE 2300000 31000000


2900(1)






CHRYSENE 22000 390000


FLUORENE 310000 4100000




PYRENE 230000 3100000




NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

-- -- -- -- -- --

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

E-SB-983-22-24 E-SB-983-26-28E-SB-983-14-16 E-SB-983-32-34E-SB-983-16-18 E-SB-983-18-20

20120719 2012071920120719 20120719 20120719 20120719

16 18 2614 3222

28 3416 18 20 24

TABLE 4-8



PAGE 26 OF 32

SAMPLE ID Non-










1-BUTANOL NA NA

2-BUTANONE 4700000 61000000

ACETONE 7000000 92000000


DIETHYL ETHER NA NA





STYRENE 1600000 20000000


TOLUENE 630000 8200000



E-SB-983-22-24 E-SB-983-26-28E-SB-983-14-16 E-SB-983-32-34E-SB-983-16-18 E-SB-983-18-20

20120719 2012071920120719 20120719 20120719 20120719

16 18 2614 3222

28 3416 18 20 24

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

TABLE 4-8



PAGE 27 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310

COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

VANADIUM 91(1)

91(1)


TPH-DRO 230 620

TPH-GRO 230000 620000


ANTHRACENE 2300000 31000000


2900(1)






CHRYSENE 22000 390000


FLUORENE 310000 4100000




PYRENE 230000 3100000




NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

-- 920 860 1700000 340 400

NA NA NA 750 B NA NA

NA NA NA -- NA NA

NA -- -- -- -- --

NA -- -- -- -- --

NA -- -- -- -- --

NA -- -- -- -- --

NA -- -- -- -- --

NA -- -- -- -- --

NA -- -- -- -- --

NA -- -- -- -- --

NA -- -- -- -- --

NA -- -- 18 -- --

NA -- -- -- -- --

NA -- -- -- -- --

NA -- -- -- -- --

NA -- -- 15 -- --

NA -- -- -- -- --

E-SB-983-36-38 E-SB-984-0-2 E-SB-984-2-4 E-SB-984-4-6 E-SB-984-6-8 E-SB-984-8-10

20120719 20120724 20120724 20120724 2012072420120724

4 6 82036

38 42 6 8 10

TABLE 4-8



PAGE 28 OF 32

SAMPLE ID Non-










1-BUTANOL NA NA

2-BUTANONE 4700000 61000000

ACETONE 7000000 92000000


DIETHYL ETHER NA NA





STYRENE 1600000 20000000


TOLUENE 630000 8200000



E-SB-983-36-38 E-SB-984-0-2 E-SB-984-2-4 E-SB-984-4-6 E-SB-984-6-8 E-SB-984-8-10

20120719 20120724 20120724 20120724 2012072420120724

4 6 82036

38 42 6 8 10

NA NA NA 69000 NA NA

NA NA NA 310000 NA NA

NA NA NA 3100 J NA NA

NA NA NA -- NA NA

NA NA NA -- NA NA



NA NA NA NA NA NA


NA NA NA -- NA NA

NA NA NA -- NA NA

NA NA NA 16000 NJ NA NA





NA NA NA -- NA NA




NA NA NA -- NA NA




TABLE 4-8



PAGE 29 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310

COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

VANADIUM 91(1)

91(1)


TPH-DRO 230 620

TPH-GRO 230000 620000


ANTHRACENE 2300000 31000000


2900(1)






CHRYSENE 22000 390000


FLUORENE 310000 4100000




PYRENE 230000 3100000




NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

NA NA NA NA NA NA

480000 120000 10000 250 210 --

1000 B NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

E-SB-984-18-20 E-SB-984-22-24E-SB-984-10-12 E-SB-984-12-14 E-SB-984-14-16 E-SB-984-16-18

20120724 20120724 2012072420120724 20120724 20120724

10 12 14 16 18 22

12 14 16 18 20 24

TABLE 4-8



PAGE 30 OF 32

SAMPLE ID Non-










1-BUTANOL NA NA

2-BUTANONE 4700000 61000000

ACETONE 7000000 92000000


DIETHYL ETHER NA NA





STYRENE 1600000 20000000


TOLUENE 630000 8200000



E-SB-984-18-20 E-SB-984-22-24E-SB-984-10-12 E-SB-984-12-14 E-SB-984-14-16 E-SB-984-16-18

20120724 20120724 2012072420120724 20120724 20120724

10 12 14 16 18 22

12 14 16 18 20 24

47000 J NA NA NA NA NA


2100 B NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA




-- NA NA NA NA NA

-- NA NA NA NA NA

-- NA NA NA NA NA

NA NA NA NA NA NA


-- NA NA NA NA NA


NA NA NA NA NA NA

-- NA NA NA NA NA


-- NA NA NA NA NA


-- NA NA NA NA NA


NA NA NA NA NA NA

-- NA NA NA NA NA

TABLE 4-8



PAGE 31 OF 32

SAMPLE ID Non-




METALS (MG/KG)

ARSENIC 12(1)

12(1)

BARIUM 1600 20000

BERYLLIUM 16 200

CADMIUM 3.9 51

CHROMIUM 23 310

COBALT NA NA

COPPER 310 4100

LEAD 400 1000

MOLYBDENUM NA NA

NICKEL 160 2000

SELENIUM 39 510

SILVER 39 510

VANADIUM 91(1)

91(1)


TPH-DRO 230 620

TPH-GRO 230000 620000


ANTHRACENE 2300000 31000000


2900(1)






CHRYSENE 22000 390000


FLUORENE 310000 4100000




PYRENE 230000 3100000




NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

32 J -- --

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

E-SB-984-26-28 E-SB-984-32-34 E-SB-984-36-38

2012072420120724 20120724

32 3626

28 34 38

TABLE 4-8



PAGE 32 OF 32

SAMPLE ID Non-










1-BUTANOL NA NA

2-BUTANONE 4700000 61000000

ACETONE 7000000 92000000


DIETHYL ETHER NA NA





STYRENE 1600000 20000000


TOLUENE 630000 8200000



E-SB-984-26-28 E-SB-984-32-34 E-SB-984-36-38

2012072420120724 20120724

32 3626

28 34 38

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA

NA NA NA mg/kg - milligrams per kilogram

NA NA NA ug/kg - micrograms per kilogram

NA NA NA NA = CRITERION NOT AVAILABLE OR NOT ANALYZED

NA NA NA EXCEEDS BOTH CRITERIA

NA NA NA EXCEEDS ONE CRITERION

NA NA NA L = Positive result biased low due to quality control noncompliance.

NA NA NA NJ = Tentatively Identified Compound.

NA NA NA J = Positive result estimated due to quality control noncompliance.

NA NA NA "--" denotes nondetected result.

NA NA NA B = Result is considered to be from laboratory blank contamination.

TABLE 4-9

ANALYTES DETECTED IN THE BLOCK E GROUNDWATER SAMPLE, JULY 2012


LOCATION Maryland

SAMPLE ID Groundwater

SAMPLE DATE Standard

MATRIX UG/L

VOLATILES (UG/L)


1,2-DICHLOROBENZENE 600 5.5 J

1,3-DICHLOROBENZENE 1.8 7.6 J


CHLOROBENZENE 100 19


TRICHLOROETHENE 5 9.3

TRICHLOROFLUOROMETHANE NA 220

FLUORODICHLOROMETHANE NA 22 NJ

GW - groundwater

J - estimated value

NA - no standard available

PW - purge water

NJ - Tentatively identified compound

UG/L - micrograms per liter

Shaded cell indicates the concentration exceeds the standard.

E-SB-976

E-SB-976-PW

20120629

GW


Tables 4-1 through 4-9


Figures 4-1 through 4-8


Section 5

Block E Southwestern AreaConceptual Site Model

A conceptual site model (CSM) was developed for polychlorinated biphenyl (PCB)

contamination in the southwestern portion of Block E based on known history and operations,

current site conditions, PCB chemical results, and PCB behavior in the environment. From

2003–2012, numerous soil samples have been collected and chemically analyzed to identify

potential soil contaminants at Block E. The Block E soil human health risk assessment (HHRA)

identified PCBs, benzo(a)pyrene equivalent (BaPEq), and the volatile organic compounds

(VOCs) 1,2,3-trichlorobenzene (123-TCB), 1,2,4-trichlorobenzene (124-TCB), and

1,4-dichlorobenzene (14-DCB) as primary contaminants of concern (COC) for Block E soil.

Arsenic and hexavalent chromium (CrVI) were also initially identified as COC, but arsenic

concentrations are considered representative of background concentrations and account for less

overall risk than the other COC.

The soil data suggest that only low concentrations of CrVI (typically less than 1 milligram per

kilogram [mg/kg]) are on site; reported CrVI concentrations do not exceed the risk-based

screening level for the industrial worker. Furthermore, CrVI concentrations reported for most soil

samples are also less than the risk-based screening levels for the hypothetical future resident, if

the levels were set at the 1×10-5 cancer risk level. PCBs are more widespread in soil at Block E,

account for most of the overall risk to human health, and are at elevated concentrations in the

subsurface at the southwestern portion of Block E. For these reasons, a CSM focusing on PCB

contamination in soil in the southwestern portion of Block E was developed through the

evaluation of site characteristics, known previous site operations, building foundation

construction, site geology, and potential contaminant pathways.


5.1 BLOCK E FORMER SITE OPERATIONS

As mentioned previously, Building D was built in the early 1940s for final assembly of aircraft

frames and was later demolished sometime between 1970 and 1974. The building had an

assembly floor (first floor) and a basement (current concrete slab) and occupied a total building

footprint of approximately 400,000 square feet. The former basement areas of former Building D

were used for welding, extrusion milling, engine preparation, and assembly (see Figure 2-7).

Former elevators and heater rooms were located along the northern, eastern, and southern

interior building-perimeter areas, and former electrical transformer rooms were located along the

northern and southern interior building-perimeter areas. The northwestern and southwestern

portions of the basement housed several nuclear-related offices and laboratories. Cleaning,

plating, and finishing work areas were along the southern interior wall near the building’s center.

As part of the 2012 electrical resistivity imaging (ERI) survey, a nine-foot deep subsurface void

was found below the concrete slab at the former location of the southern elevator. This void is

approximately 60 feet east of the deep PCB contamination found at soil borings SB-852, SB-854

and SB-833 (see Figure 4-6). Soil samples collected around the former elevator area indicate

only shallow soil PCB contamination; however, deep soil samples have not been collected

adjacent to or beneath the former elevator area. Although this area would not be expected to be

the source for PCBs in the deeper subsurface soil to the west, additional soil sampling here

would be necessary to fully assess this location as a potential contaminant source area.

Several electrical-service manholes were in the interior of the building. Engineering drawings

indicate sump pumps and small-diameter discharge lines that were apparently used to pump out

standing water from the manholes. These pipes ran to the building exterior and are shown as

being connected to the northern and southern storm sewer lines. The drawings show numerous

floor drains and indicate that they are connected to the storm sewer system.

As part of the storm-sewer interim remedial measures (IRM) conducted in 2011, manhole MH-9,

which was previously buried, was partially excavated, repaired, and the top extended to the

ground surface to drain runoff. At the time of this repair, a pipe lateral was observed extending

from the manhole toward the building slab, indicating that floor drains may be connected to the

storm sewer system at Block E. Other portions of the storm sewer system in this area could not


be accessed during the IRM due to blockages; therefore, closed-circuit television of the storm

sewer could not be conducted to confirm the presence of other floor drain connections.

5.2 BLOCK E CONCRETE SLAB FOUNDATION

The former Building D foundation system is described below. Information on the foundation was

obtained by reviewing existing as-built foundation drawings, including “Plant One—

Building ‘D’ for the Glenn L. Martin Co., Middle River, Baltimore, Maryland,” dated August 22,

1945. Drawings used for the description below include sheets “1-S, Footing Plan—Column and

Footing Schedule,” “2, Foundation Plan,” and “2-S, Wall & Foundation Detail.” These

documents are in Appendix I of this report.

The foundation system for the former Building D is comprised of both typical reinforced-

concrete spread footings and reinforced-concrete pile caps over a multiple round-pile system.

The spread footings and pile caps are spaced at approximately 25 feet-0 inches on-center in both

the east–west and north–south directions. At the exterior of the building, a reinforced-concrete

foundation wall and continuous wall footing are provided between the concrete column/footing

locations. The typical concrete spread footings are generally east of column line 21 and west of

column line 16. The drawings indicate that all of the pile-supported footings lie between column

lines 16 and 21.

The basement slab-on-grade was comprised of eight inches of concrete. The drawings show no

reinforcement details to indicate that the slab-on-grade was reinforced, but reinforcing has been

observed in the field where the concrete has been disturbed. In addition, a reinforced-concrete

retaining wall and associated footing lies at the southwestern corner of the building. This

retaining wall extends approximately 60 feet beyond the face of the main portion of the building.

The general construction of the typical reinforced-concrete spread footings included footings

with dimensions ranging from 5-feet 6-inches by 5-feet 6-inches to 16-feet 6-inches by

20-feet 0-inches. Their respective reinforcing ranged from 13 0.5-inch-diameter bars spanning

both ways to 37 one-inch-diameter bars spanning both ways. Their respective loading conditions,

as indicated in sheet “1-S, Footing Plan—Column and Footing Schedule,” ranged from

150 kilopounds (kips) for the 5-foot 6-inch square footing to 1763 kips for the 16-foot by 20-foot

footing.


The general construction of the concrete pile caps over concrete piles includes pile caps ranging

from 5-feet 6-inches by 5-feet 6-inches to 13-feet 2-inches by 14-feet 6-inches. Their respective

reinforcing ranges from six one-inch-diameter bars spanning both ways to 29 one-inch-diameter

bars spanning both ways. Their respective loading conditions, as indicated in sheet “1-S, Footing

Plan—Column and Footing Schedule,” ranged from 210 kips for the five-foot-square footing

pile-caps to 1763 kips for the 13-foot by 14-foot footing pile-caps. In addition, the table in the

drawing indicates a pile capacity of 40 tons per pile.

The exact size, length, and composition of the existing round piles could not be determined from

information in the drawings. All concrete associated with the foundation system was to have a

compressive strength of 2,500 pounds per square inch at 28 days.

The footers in the area of former waste disposal area and southwestern former transformer room

where PCBs have been detected in deep soil are shown as fairly shallow, with depths ranging

from 4.5 to 5.2 feet below grade. The drawings indicate that deep piles driven for the foundation

support were installed east of the former waste disposal area and southwestern former

transformer room.

5.3 BLOCK E GEOLOGY AND HYDROGEOLOGY

The Block E area was a wetland before building construction. It was filled with soil to expand

the usable area of the Middle River Complex (MRC) and construct the building and Dark Head

Cove ramp areas to the south. Lithologic logging of soils beneath the MRC (conducted during

extensive site characterization) has identified a very heterogeneous substrate. Underlying soils

are composed primarily of silty sands, fine-grained to medium-grained sands, silty clays, clayey

silts, and plastic clay, with the primary lithology being clay to silty clay. Sand lenses were

encountered, but in general do not appear to be continuous beneath the facility.

Geologic soil logs for wells and soil boring at Block E were used to construct geologic

cross-sections across Block E. Locations of the cross-sections are shown in Figure 5-1.

Cross-sections A–A' and B–B' are shown in Figures 5-2 and 5-3, respectively.

Cross-section A–A' (Figure 5-2) is in the western portion of Block E, extending from well

MW-62C to the northwest to well MW-103 to the southeast. Concrete covers most of the ground


surface along this cross-section. The cross-section shows a two- to three-foot-thick sand layer

beneath the concrete at soil boring SB-853 and south to well MW-103. Sandy fine-grained gravel

was encountered at these depths at soil boring SB-852, west of SB-853. Samples were not

recovered at depths of 1.5–8 feet at SB-852 and 2–4.5 feet at SB-853, as indicated by white areas

in the figure.

Generally, the subsurface in the western portion of Block E consists of clay, silty clay, and clayey

silt to a depth of 30 feet below grade. Four thin interbeds of silty-sand and sandy-silt are in this

area. At SB-853, silty-sand and sandy-silt layers were observed at depths of 5.5–6 feet,

12.5–13 feet, 19.5–20 feet, and 26–26.5 feet below grade. The silty-sand and sandy-silt layers are

thickest at MW-62C, and pinch out toward the south at SB-853. Only the upper layer of silty-

sand and sandy-silt was observed to the south at well MW-103. A sandy-silt and fine sand layer

was encountered at depths of 50–63 feet below grade at well MW-62C.

Cross-section B–B' (Figure 5-3) is in the southern portion of Block E and extends from soil

boring SB-852 to the west to well MW-105 to the east. This cross-section runs along the

southern interior edge of the former Building D footprint. Concrete covers most of the ground

surface along this cross-section. Generally, the subsurface along the southern portion of Block E

consists of clay, silty clay, and clayey silt to a depth of 30 feet below grade. A thin layer of silty

sand and medium-grained sand occurs at depths of 12–13.5 feet at SB-854 and 9.5–12 feet at

SB-859. However, this material was not found farther east at SB-837 (except that silty clay with

gravel and medium-grained sand are reported at a depth of 9–9.5 feet at SB-837). Voids were

reported in the boring log at depths of 2–11 feet at SB-857 (not shown) northwest of SB-859.

Farther east, a thicker, more extensive silty sand was encountered at depths of 15–30 feet at

MW-72B and 9–29 feet at MW-105.

Groundwater in the Block E area is shallow, with measured groundwater depths ranging from

approximately one foot to slightly more than eight feet below grade in the central and southern

portions of Block E, and 10–15 feet below grade in the northern portion of Block E, as measured

in groundwater monitoring wells. Groundwater levels fluctuate seasonally and respond to

droughts and moderate to heavy precipitation events. Annual groundwater-level data for Block E

wells show that groundwater level fluctuation range from approximately 0.5 to nearly three feet,

and are typically higher in late fall through early spring in response to recharge from meso-scale


frontal systems (i.e., coastal low-pressure systems) and occasional tropical storms. However,

these levels were measured during discrete annual rounds of groundwater levels; therefore, these

groundwater fluctuations may be greater than indicated, and do not reflect groundwater levels

that were monitored continuously or seasonally at wells. For example, the available data may not

show short-term, transient groundwater-level responses from significant recharge due to a large

precipitation event.

A recent (July 2012) Block E groundwater-elevation contour map was developed for this

investigation for the upper surficial aquifer wells (see Figure 4-1). Groundwater elevation

contours can be used to estimate groundwater flow direction, as groundwater generally is

expected to flow perpendicular to the elevation contours, or what is known as the “groundwater

potentiometric surface.” As illustrated in the July 2012 groundwater-elevation contour map, (see

Figure 4-1), groundwater in Block E flows southeast toward Dark Head Cove.

Local groundwater flow is influenced by several factors, and can deviate from the mapped

surface based on well data in the presence of more-permeable naturally occurring stratigraphic

layers. Groundwater flow may also be altered by manmade features such as more-permeable

gravel or sand envelopes installed around subsurface utilities, leaking or broken subsurface

utilities (e.g., storm sewers or sanitary sewers), or low-permeability features such as subsurface

concrete footers, pilings, or walls that will act to impede or redirect groundwater flow.

Groundwater flow may also be influenced by surface features such as concrete or pavement

(reduced local infiltration and local groundwater recharge); wetlands, ponds, or storm-water

management ponds (increased infiltration and local groundwater recharge); or breaches in

concrete or paved surfaces (increased infiltration and local groundwater recharge). No surface

water bodies cross or emanate from Block E, and no wetlands have been identified in or around

Block E.

5.4 BLOCK E SURFACE WATER

Surface water runoff discharges from Block E via storm drains (see Figure 2-7), except for areas

immediately adjacent to Cow Pen Creek and Dark Head Cove (storm drains and storm drain

outfalls are shown in Figure 2-7 as yellow lines and light blue squares). Historical records show

more than 20 former Building D basement floor-drain lines (see drain cleanouts and drain lines

in Figure 2-7) connected to the storm-drain system, which ultimately discharges to Dark Head


Cove. Lockheed Martin Corporation maintains a State of Maryland National Pollutant Discharge

Elimination System (NPDES) permit (state discharge permit No.: 00-DP-0298,

NPDES No.: MD0002852), issued by the Maryland Department of the Environment (MDE)

Industrial Discharge Permits Division, Water Management Administration.

These records also show several sanitary sewer and storm drains beneath the floor (thick dashed

black lines in Figure 2-7). Recent field activities have found at least two open storm-drain catch

basins on or adjacent to the former Building D slab. No records indicate whether these lines are

currently open or if they have been sealed or filled as part of building demolition.

5.5 POSSIBLE BLOCK E PCB-RELEASE MECHANISMS ANDTRANSPORT PATHWAYS

Soil data collected from Block E indicate that past activities have released contaminants to the

surrounding environment. MRC site assessments indicate that a large percentage of site soils

contain very high clay and silt content and exhibit poor surface drainage. Several possible

scenarios can explain the PCBs detected in Block E soils. Currently, there are no records or

reports that confirm which mechanism(s) are responsible for the occurrence of PCBs in deep soil

at the southwestern portion of Block E.

Figures 5-4 through 5-6 show the PCB results for the samples along geologic cross-sections

A-A', A'–A (reverse view of A–A' to show PCB results hidden in A–A'), and B–B'. Figures 5-7

and 5-8 are fence diagrams that show closer views of the geology and PCB concentrations in the

area of the highest PCB concentrations (e.g., SB-833 and SB-853), along with results from

nearby 2012 deep borings.

Two of the highest PCB concentrations (19,000-24,000 mg/kg) were detected in soil samples

collected at borings SB-833 and SB-853. As shown in Figure 5-7, boring SB-833 has a thin layer

of silty sand at a depth of 9-10 feet below grade (elevations of 1 to 2 feet) at the sample location

of the elevated PCB concentration of 24,000 mg/kg (sample SB-833-9). Below the sand is clay at

a depth of 10 feet (elevation of 1 foot). At boring SB-853, an elevated PCB concentration of

19,000 mg/kg is present in a sample collected from a depth interval of 10-12 feet (+1 to -1 foot

elevation). At a depth of 12.5 feet at (approximate elevation of -1.5 feet) the silty-clay logged

above this depth changes to stiff, dense, clay with no silts or sands. The clay at 10 feet at SB-833


and the top of the denser clay at SB-853 at 12.5 feet (logged as containing no silt and sand) is

expected to inhibit PCBs from migrating to the deeper soil at highly elevated concentrations.

This is supported by the relatively lower PCBs concentrations in the next deeper samples

collected at these borings (61 mg/kg at SB-833-11 [11 feet] and 780 mg/kg at SB-853-12-16

[12-16 feet]).

PCB sample results in Figure 5-8 also show the presence of a soil boundary that has limited the

downward movement of elevated concentrations of PCBs to 10-15 feet below grade west-east

from SB-852 (west) to SB-855 (east). A sample collected at nine feet at soil boring SB-853 has

the highest PCB concentration of 19,000 mg/kg in Figure 5-8. At depths of 11.5 feet at SB-852

(approximate elevation of 0.5 feet in Figure 5-8) and 12.5 feet at SB-853 (approximate elevation

of -1.5 feet in Figure 5-8), the silty-clay logged above these depths changes to stiff, dense, clay

with no silts or sands. The top of this dense clay logged as containing no silt and sand (i.e., 11.5

and 12 feet) is expected to inhibit PCBs from migrating to the deeper soil at highly elevated

concentrations, and supported by the distinctly limited and lower PCB concentrations found in

samples collected below these depths (e.g., PCB concentrations at SB-853 reduce from

19,000 mg/kg at nine feet to 780 mg/kg at 11 feet). Similar distinct reductions in PCB

concentrations are found at a depth of 12 feet at a silty-sand and clay interface in SB-984 (where

PCBs reduce from 480 mg/kg to 120 mg/kg at an elevation of -1 foot in the figure), at a depth of

eight feet at SB-854 (where PCBs reduce from 470 mg/kg to 2 mg/kg at an elevation of three

feet), and a depth of 12 feet at SB-855 (where PCBs reduce from 680 mg/kg to 16 mg/kg at an

elevation of -1 foot).

Figures 5-7 and 5-8 also show the approximate boundaries for the PCB residential cleanup level

one mg/kg and the non-residential cleanup level of 10 mg/kg. The figures show that the primary

areas in the southwestern area are similar in size where PCBs exceed the residential and

non-residential cleanup levels. The primary source area extends from SB-833 to the north to

SB-862 to the south (Figure 5-7), and west of SB-852 to east of SB-855 (Figure 5-8). Note that

PCB concentrations above the non-residential cleanup level of 10 mg/kg extend north of SB-833

at SB-833A, SB-833I, and SB-848, but these are not shown on the figures. Results for SB-833I

and SB-848 are shown on Figures 5-4 and 5-5, respectively. Only in the area of soil borings

SB-852 and SB-853 are differences in depths apparent for the PCB residential and

non-residential screening level exceedances. In the area of these borings, the maximum depths


for non-residential cleanup level exceedances are approximately 20 feet below grade (elevation

of -9 feet) at SB-852, and 24 feet below grade (elevation of -13 feet) at SB-853.

As mentioned previously, dielectric fluids may have leaked or spilled from transformers at the

former transformer room in the southwestern portion of former Building D, possibly during

operations but also possibly during building demolition. PCB-containing wastes may have also

been stored at the former waste disposal area outside of the building. Since oils can penetrate

pores in concrete or travel through cracks or floor joints and degraded seals around features such

as cleanouts, vaults, or other utilities, a leaking or overfilled waste containment vessel or drum

could have resulted in a release that would travel to depth in the upper sandy and silty portions of

the soil column. As shown in Figure 5-8, the 1,000 mg/kg PCB contour line extends from a

shallow sample collected in gravel at SB-852 (PCBs at 3,300 mg/kg) to the nine-foot sample

collected at SB-853 (PCBs at 19,000 mg/kg). Elevated PCB concentrations of 680-800 mg/kg

were also in the shallow samples from SB-861 (not shown) and SB-862 (Figure 5-7). SB-852,

SB-853, SB-861, and SB-862 are located adjacent to each other in the western portion of the

southwestern former transformer room. Although there was poor lithologic sample recovery in

the upper portions of these soil borings SB-852 and SB-853, coarse-grained soils including

gravel and sand were encountered in the first 5-8 feet of these two borings. Gravelly, sandy, and

silty soils or the presence of voids in this shallow zone would not inhibit the downward

migration of dielectric fluids or oils spilled or leaked at the surface. Silty or sandy clays can also

become saturated with oils, particularly if smaller sand seams, macropores, or fissures are

present. Therefore, the origination of PCBs in the former southwestern transformer room may

have been from a surface release in the area of SB-861 and SB-862. Oil product reaching the

subsurface may spread across the top surface of clay layers or clay seams, or travel along

permeable materials installed along underground utility lines. A nine-foot deep void is also in the

area of a former elevator along the southern boundary of former Building D, which could have

provided a subsurface conduit for spilled or leaked PCB materials. Although the elevator area is

not expected to be the source for PCBs in the deeper subsurface soil to the west, additional soil

sampling at the elevator area would be necessary to fully assess this as a potential contaminant

source area. Elevated concentrations of PCBs have also been detected in soil around manholes

and in sediments in manholes and catch basins that are part of the storm drain system running

along the southern edge of the former Building D (see Figure 4-6). In Block E, surface soil


contaminants have been transported through overland runoff, storm water conveyance, and

erosion. PCBs have been detected in sediment in Dark Head Cove.

PCB-containing oils released to storm drains, catch basins, or sanitary sewer lines can enter the

subsurface soil through structural cracks and separations at pipe joints. The oils can migrate out

to the permeable envelope of gravel placed around the perimeter of these utilities during

construction.

Once released, chemicals may migrate within an environmental medium (e.g., soil) or migrate to

another environmental medium (e.g., air or water). PCBs in concrete and soil could migrate from

both surface and subsurface soil to groundwater through leaching of chemicals in the soil or in

the presence of a solvent. The migration of soil particulates from soil to air is probably

significantly limited, since most of the surface soils in the sub-areas of concern are either paved

or grass covered. Subsurface soil is not currently exposed in any of these sub-areas; however, if

future construction were to bring subsurface soil to the surface, contaminants in subsurface soil

could be transported into the air through wind erosion or through volatile emissions.

At Block E, transport of PCBs through groundwater is unlikely due to the hydrophobic

properties of PCBs; however, PCBs can be mobilized as dissolved constituents in groundwater in

the presence of solvents. Low concentrations of PCBs have been detected in groundwater

samples collected at Block E to date. PCBs have either not been detected in groundwater in

nearby wells, or have been detected only at well MW-43A, at a concentration of 0.24 µg/L in

2011, which is below the MDE groundwater standard of 0.5 µg/L. PCBs were not detected in

any Block E groundwater sample from wells in 2012.


Section 6

Summary

The 2012 Block E additional field investigation included an electrical resistivity imaging (ERI)

geophysical survey and the collection and chemical analyses of soil and one groundwater sample

to better identify and evaluate the horizontal and vertical extent of polychlorinated biphenyls

(PCBs), polycyclic aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs), total

petroleum hydrocarbon (TPH)-gasoline-range organics (GRO), TPH-diesel-range organics

(DRO), and metals (including hexavalent chromium [CrVI]) in soils, and to obtain data to

complete an updated human health risk assessment (HHRA) and aid remedy selection. A

radiological study was also conducted and is provided separately as Appendix A. This

investigation entailed the following activities:

performed high-resolution, subsurface, electrical resistivity imaging, focusing within thesouthwest quadrant of the former Building D (which covered approximately 600 feet by270 feet) and using a 1.5-meter electrode 60-foot-grid spacing, obtaining 18 images to amaximum depth of 55 feet below grade

collected concrete surface samples at 40 locations associated with the former Building Dconcrete slab to evaluate current risk to site workers from polychlorinated biphenyls. Sixconcrete samples were also analyzed for asbestos, for waste characterization purposes.

advanced shallow soil borings at 28 locations to four feet below grade to furtherinvestigate polychlorinated biphenyls, polycyclic aromatic hydrocarbons, volatile organiccompounds, total petroleum hydrocarbons, and metals in soil along the periphery of theformer Building D foundation

advanced deep-soil borings at six locations (based on results of the geophysical survey)to depths of 40–50 feet below grade to further characterize polychlorinated biphenyls,polycyclic aromatic hydrocarbons, volatile organic compounds, total petroleumhydrocarbons, and metals in soil in areas near the former waste disposal area and formertransformer room

collected seventy-seven samples from concrete and shallow and deep soil, includingbackground samples of soil and concrete, and analyzed for isotopic uranium and thorium(Appendix A)


collected a shallow groundwater sample from a soil boring for chemical analyses andmeasurements of field parameters

collected groundwater levels for Block E wells


additionally, reviewed historical maps and figures to gain insight into the constructionand locations of underground utilities at former Building D, and to assess historicaloperations that may have led to the release of the identified contaminants of concern(COC)

The following summarizes the findings of the 2012 Block E program:

The electrical resistivity survey confirms the presence of a metallic water pipelinerunning through the study site. The pipeline runs from the southwestern corner to thenortheastern boundary of the survey area parallel to survey lines MID-4, MID-5, andMID-6. A nine-foot-deep void was detected after advancing a 10-foot long steel rod in thearea reported to be a former elevator shaft. Strong and consistent correlations betweenresistivity readings and lithology are not apparent in the survey results. Four soil boringswere advanced in areas of geophysical anomalies. Strong correlations between chemicalconstituents and high conductivity or high resistivity could not be established with thissurvey.

Overall, polychlorinated biphenyl concentrations greater than the residential screeninglevel were detected in three concrete samples and 28 soil samples collected inJune–July 2012. Aroclor-1242, Aroclor-1248, and Aroclor-1260 are the only PCBsdetected, with detected concentrations ranging from 0.020 milligrams per kilogram(mg/kg) to a maximum of 1,700 milligrams per kilograms in the 4–6 foot soil-samplinginterval at deep-soil boring E-SB-984, which is in the area of a former electricaltransformer room in the southwestern portion of Block E. The highest polychlorinatedbiphenyl concentration collected at a peripheral soil location was 800 milligrams perkilogram at E-SB-980-0–0.5, which is adjacent to the former electrical substation andtransformer room in the south–central portion of Block E.

The highest benzo(a)pyrene equivalents (BaPEq) concentrations, all of which areindustrial screening level exceedances (12 exceedances), and most residential screeninglevel exceedances are found in shallow soil at depths of 0–0.5 foot or 0.5–2 feet in theJune–July 2012 samples. Five residential screening-level exceedances were detected inthe June–July 2012 samples collected below two feet. The June–July 2012benzo(a)pyrene equivalent results confirm previous findings that benzo(a)pyreneequivalent concentrations are, for the most part, below the industrial screening level inthe northern and eastern portions of Block E, and that benzo(a)pyrene equivalentconcentrations primarily exceed screening levels in samples from the southern edge ofthe concrete slabs to the southern boundary of Block E.


Seventeen metals and hexavalent chromium (CrVI) were detected in one or moreperipheral samples. However, all metal concentrations are below non-residentialscreening levels, and exceed residential levels infrequently. In deep-boring soil samples,14 metals were detected in one or more samples, and nine metals were detected in allsamples. However, only two samples of chromium exceed the residential screening level,and two samples of vanadium exceed the residential and non-residential screening levels.

Twenty soil samples collected from the June–July 2012 deep borings were analyzed forvolatile organic compounds. Most volatile organic compounds were detected in shallowsoil samples from boring E-SB-984, which is in the area of a former electricaltransformer room in the southwestern portion of Block E. This boring containspolychlorinated biphenyls above 100 milligrams per kilogram at 4–14 feet below grade.Concentrations of 1,2,3-trichlorobenzene (123-TCB) and 1,2,4-trichlorobenzene(124-TCB) exceed the residential or non-residential screening levels in E-SB-984 soilsamples collected at 4–6 and 10–12 feet.

The 2012 and previous polychlorinated biphenyl data show three main areas where

polychlorinated biphenyl concentrations exceed screening levels. The first is the southeastern

area near the 500,000-gallon water tank. The grass field west of the water tank is the former

location of a 500,000-gallon aboveground storage tank (AST) for fuel oil. Two sampling clusters

in this area are located around two storm-drain manholes currently at the site. In the

southwestern portion of this area, polychlorinated biphenyl exceedances are limited to the first

four feet of soil. Polychlorinated biphenyls in this area may be due to minor surface spills of oils

during facility operations, or drainage from the southwestern portion of Block E.

The second area of polychlorinated biphenyl exceedances is in the south–central portion of

former Building D. This area housed the former cleaning, plating, and finishing rooms, a former

electrical transformer room on the basement floor, and an electrical substation outside the

building. Two clusters of elevated-concentration samples in this area are located around two

storm-drain manholes currently at the site. Most polychlorinated biphenyl exceedances are

limited to the first four feet of soil. However, polychlorinated biphenyl exceedances were

detected in soil 4–10 feet deep at four borings in this area. Polychlorinated biphenyls in this area

may be due to surface spills of oils during facility operations, from leaking transformers, released

during the building demolition, or drainage from the southwestern portion of Block E.

The third area of polychlorinated biphenyl exceedances is in the western and southwestern

portion of Block E. These polychlorinated biphenyl exceedances are in the area of the former

nuclear laboratory, former electrical transformer room, and former waste collection area.


Polychlorinated biphenyls were detected at a concentration of 24,000 mg/kg at nine feet and

19,000 mg/kg at 8–12 feet in the area of the former transformer room. Results from several

additional deep soil borings advanced in this area indicate that polychlorinated biphenyls are in

soil at elevated concentrations (exceeding 100 milligrams per kilogram) at depths up to 16 feet

below grade in the southwestern portion of Block E.

These high concentrations indicate the possibility of residual polychlorinated

biphenyl-containing product at these depths. The high concentrations of polychlorinated

biphenyls in concrete samples from this area also suggest that surface releases may be

responsible for the subsurface polychlorinated biphenyls. The results for two deep soil borings

advanced previously in 2011 (borings E-SB-852 and E-SB-853) indicate that polychlorinated

biphenyls may be at concentrations exceeding the residential screening criterion at a depth of

30 feet below ground surface in the area of the former electrical transformer room and former

nuclear facility waste collection area.

The maximum depth for an industrial screening level exceedance is 24 feet at soil boring

E-SB-853. However, results from surrounding deep-soil borings indicate that concentrations

above the residential and industrial screening levels in deep soil are limited, and exceedances in

surrounding borings (excluding E-SB-852 and E-SB-853) are only in soil samples collected at a

depth of 16 feet or less. The radiological study concluded that workers were not at risk during the

2012 field activities, and such risks would not be expected in future work at Block E. Screening

and radiological analyses of concrete and soil indicate that site cleanup activities to address

radiological hazards are unnecessary at this time. Possible radiological contamination located

within sealed drain pipes should be further analyzed during remedial activities.


Section 7

References

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