genesis engineering & redevelopment, inc. 115 south school ...€¦ · genesis engineering &...

Genesis Engineering & Redevelopment, Inc. 115 South School Street, Suite 8, Lodi, California 95240 Phone: 209.599.2004 Fax 209.433.3990

March 30, 2018 Mr. Mohammad Zaidi Los Angeles Regional Water Quality Control Board 320 West 4th Street, Suite 200 Los Angeles, California 90013 Subject: Soil, Soil Vapor, and Groundwater Delineation Work Plan

Hi-Shear Corporation, Torrance, California Case No. 218, Site ID No. 2042300

Dear Mr. Zaidi: The attached Soil, Soil Vapor, and Groundwater Delineation Work Plan is submitted on behalf of the Hi-Shear Corporation.

Should you have any questions or require additional information, please do not hesitate to contact me at (209) 599-2004. Respectfully submitted, Genesis Engineering & Redevelopment, Inc.

Stephen J. Van der Hoven, Ph.D., P.G. Vice President cc: T. Schmidt and D. Evans, Hamrick & Evans, LLP C. Darville, Hi-Shear Corporation

SOIL, SOIL VAPOR, AND GROUNDWATER DELINEATION WORK PLAN

Hi-Shear Corporation 2600 Skypark Drive

Torrance, California 90505

Prepared For:

Thomas P. Schmidt David L. Evans

Hamrick & Evans, LLP 2600 West Olive Avenue, Suite 1020

Burbank, California 91505

Prepared By:

Genesis Engineering & Redevelopment, Inc. 115 South School Street, Suite 8

Lodi, California 95240

September 28, 2018

_____________________________ Stephen J. Van der Hoven, Ph.D., P.G.

Vice President

Hi-Shear Corporation Project i Soil, Soil Vapor, and Groundwater Delineation Work Plan September 2018

Table of Contents 1.0 INTRODUCTION.......................................................................................................... 1 2.0 SITE BACKGROUND .................................................................................................. 1

2.1 Regional Geology ......................................................................................................... 2 2.2 Site Geology and Hydrogeology .................................................................................. 3

3.0 SUMMARY OF EXISTING DATA ............................................................................. 4 3.1 Soil ............................................................................................................................... 4

3.1.1 Metals .................................................................................................................... 4 3.1.2 Total Petroleum Hydrocarbons ............................................................................. 6 3.1.3 VOC ...................................................................................................................... 6

3.2 Soil Vapor .................................................................................................................... 7 3.2.1 On-Site Distribution of PCE and TCE (2011) ...................................................... 8 3.2.2 Off-Site Distribution of PCE and TCE (2014 – 2016) ....................................... 10

3.3 Groundwater ............................................................................................................... 14

4.0 SCOPE OF WORK...................................................................................................... 15 4.1 Screening Levels ........................................................................................................ 15 4.2 Delineation of Soil Vapor and Potential Vapor Intrusion East of Crenshaw ............. 17 4.3 On-Site Soil and Soil Vapor ....................................................................................... 18 4.4 Delineation of Off-Site Soil and Soil Vapor Impacts ................................................ 19 4.5 Delineation of Perched Groundwater ......................................................................... 19 4.6 Delineation of the Horizontal and Vertical Extent of Groundwater Impacts ............. 21

5.0 REPORTING ............................................................................................................... 21 6.0 SCHEDULE.................................................................................................................. 22 7.0 REFERENCES ............................................................................................................. 23

Hi-Shear Corporation Project ii Soil, Soil Vapor, and Groundwater Delineation Work Plan September 2018

Table of Contents (continued)

FIGURES 1 Site Location Map 2 Site Layout and Existing Soil Vapor Probe, Monitoring Well, and Cross Section

Locations 3 Cross Section A-A’ 4 Cross Section B-B’ 5 PCE Concentration Contours at 5 Feet and Existing Soil Vapor Probe Locations 6 TCE Concentration Contours at 5 Feet and Existing Soil Vapor Probe Locations 7 Shallow Hydraulic Head Contours 8 TCE Contours in Shallow Groundwater 9 TCE Contours in Intermediate Groundwater 10 Vapor Intrusion Assessment East of Crenshaw Boulevard 11 Existing and Proposed Soil Vapor Probe Locations West of Crenshaw Boulevard 12 Proposed Perched Groundwater Monitoring Well Locations 13 Proposed Regional Groundwater Monitoring Well Locations TABLES 1A Metals Concentrations in Soil 1B TPH Concentrations in Soil 1C Carbon Chain Concentrations in Soil 1D Chlorinated VOC Concentrations in Soil 1E Other VOC Concentrations in Soil 2 Chlorinated VOC Concentrations in Soil Vapor 3 Groundwater Elevations and Field Measurements 4 Chlorinated VOC Concentrations in Groundwater 5A TPH Carbon Chain in Groundwater (2018) 5B Historical TPH Carbon Chain in Groundwater (2010-2017) 6 Hexavalent Chromium, 1,4-Dioxane, and Perchlorate Concentrations in Groundwater 7 Metals Concentrations in Groundwater APPENDICES A Sampling and Analysis Plan B Quality Assurance Project Plan C Health and Safety Plan D Investigation Schedule

Hi-Shear Corporation Project 1 of 23 Soil, Soil Vapor, and Groundwater Delineation Work Plan September 2018

1.0 INTRODUCTION

This Soil, Soil Vapor, and Groundwater Delineation Work Plan (“Work Plan”) was prepared in response to the requirements in the August 28, 2018 Los Angeles Regional Water Quality Control Board (“RWQCB”) letter; based on the 13267 Order dated October 29, 2009. The Work Plan details an investigation to delineate the extent of volatile organic compound (“VOC”) impacts to soil, soil vapor, and groundwater at and in the vicinity of the Hi-Shear Corporation facility located at 2600 Skypark Drive, Torrance, California (“Site”) (Figures 1 and 2). The principal objectives of the Work Plan are:

1. Delineate the extent of VOC impacts to soil vapor and the vapor intrusion potential to the east of Crenshaw Boulevard;

2. Collect additional data to evaluate current VOC and metal impacts to on-Site soil and VOC impacts to on-Site soil vapor and the migration of soil vapor both off-Site and on-Site;

3. Delineate the extent of VOC and metal impacts to soil and VOC impacts to soil vapor to the north, west, south of the Site and east of the Site to Crenshaw Boulevard;

4. Delineate the horizontal extent of the perched groundwater layer and evaluate VOC, metals, 1,4-dioxane, hexavalent chromium, and perchlorate impacts to perched groundwater; and

5. Delineate the horizontal and vertical extent of VOC, metals, 1,4-dioxane, hexavalent chromium, and perchlorate impacts to groundwater downgradient (east) of the Site.

Each of these objectives will be discussed as a separate phase of work. Each phase of work is designed to be stand-alone, with its own set of objectives and investigation report.

2.0 SITE BACKGROUND

The Site is located on an approximately 12.25 acre portion of the Torrance Municipal Airport (aka Zamperini Field), which is owned by the City of Torrance (APN 7377-006-905). The City of Torrance leases the Site to Hi-Shear Corporation.

Hi-Shear Corporation operates a facility on the Site that manufactures fasteners for the aerospace industry. Hi-Shear previously occupied an adjacent portion of the airport directly to the west of the Site that is currently leased by La Caze Development, which has a sublease with Lowe’s HIW, Inc. The LARWQCB has assigned the Hi-Shear Site SCP Case No. 218, Site ID No. 2042300.


The Site is bounded by commercial or industrial properties to the north, east, and west. The Site is bounded to the north-northeast by Skypark Drive; to the south-southwest by the Torrance Municipal Airport; to the west-northwest by Lowe’s Home Improvement; and to the east by the former Robinson Helicopter facility, a Lexus Dealership at 24777 Crenshaw Boulevard, and Dasco Engineering at the corner of Crenshaw Boulevard and Skypark Drive (Figures 1 and 2). There are residential properties further to the east of the Site across Crenshaw Blvd.

Soil, soil vapor, and groundwater at and in the vicinity of the Site have been impacted primarily with VOC, petroleum hydrocarbons, and metals. It appears that other current or historical operations on the properties surrounding the Site have contributed to the regionally detected VOC and petroleum hydrocarbon contamination.

2.1 Regional Geology

The Site is located within the Los Angeles Basin, specifically the West Coast Basin. The West Coast Basin extends from the Pacific Ocean southeast to the Palos Verdes Hills; San Pedro Bay, and Orange County (California Department of Water Resources [CDWR], 1961). It is bordered by the Central Basin to the east and the Ballona Gap to the north.

According to the geologic map of the Redondo Beach, Torrance, and San Pedro quadrangles, the Site is underlain by relatively flat-lying unconsolidated marine and continental deposits of Pleistocene age. These deposits overlie of Tertiary age sedimentary and crystalline bedrock. This is also supported from the Palos Verdes Peninsula Map (DF-70), showing the Site as primarily Qae, Holocene alluvium of mostly loamy clay of valley and flood plains that are slightly elevated and locally dissected.

The Site is underlain by approximately 200 feet of gravel, sand, sandy silt, silt, and clays of Pleistocene Lakewood Formation. Underlying the Site is the Gage Aquifer, which is within the Lakewood Formation. The thickness of the Gage Aquifer is more than 100 feet in vicinity of the Site and comprised of primarily sand with trace amounts of gravel and thin beds and silt and clay.

Underneath the Lakewood Formation are the sediments of the San Pedro Formation. A clay layer between 40 and 100 feet thick separates the Gage Aquifer and the Silverado Aquifer. The Silverado aquifer is estimated to be present between 250 and 550 feet below the Site.

The Pliocene-age Pico Formation, underlying the San Pedro Formation, is composed of mostly marine sediments which include sandstones, siltstones, and mudstones. While upper units of this formation have low permeability and act as aquitards, water at deeper depths is often saline (CDWR, 1961).


Groundwater flow within the vicinity of the Site is eastward and its flow pattern is influenced by a combination of groundwater injection wells to the west and withdrawals from the east. The groundwater injection wells to the west was completed in 1969 by the West Coast Basin Barrier Project (WCBBP). The barrier wells extend approximately 9 miles in a north-south orientation, with the closest barrier wells location approximately 2.75 miles west-northwest of the Site (BBL, 2002).

2.2 Site Geology and Hydrogeology

A geologic cross section of a vertical distribution along Crenshaw Boulevard is shown on Figure 3; and a horizontal distribution south of Skypark Drive to 247th Street is shown on Figure 4. The following major geologic units are laterally continuous:

Clay is the predominant grain size in the upper 15 feet to 20 feet bgs

A silt and silty sand layer between 5 feet and 10 feet thick that is discontinuous in the vicinity of MW-20/VP-27

Sand is the predominant grain size between 30 feet and 110 feet bgs (the maximum depth drilled along Crenshaw)

In addition to the laterally continuous layers discussed above, there is a discontinuous clay sequence present near the southern portion of the cross section. The clay ranges up to approximately 30 feet thick in these areas, and rapidly pinches out to the north along Crenshaw Boulevard. A perched groundwater unit is also present at approximately 60 feet bgs in the southern most borings along the cross section (VP-38 and MW-21). The full extent of perched groundwater and its interaction with the underlying regional water table and the migration of potential VOC contaminates in the area are not currently known.

The regional water table is first encountered at a depth of approximately 90 feet bgs. The thickness of the regional aquifer to extends to a depth of at least 285 feet bgs. The regional aquifer is unconfined; and there is no evidence in the immediate Site vicinity of fine-grained sediments (clay or silt) at or near the water table that act as a confining layer. There is no geologic evidence of lithologic or structural changes that might create hydrogeologic barriers.

The aquifer material beneath the Site consists of highly permeable, poorly-graded and silty fine sand. Groundwater pump tests were conducted in March 2013; analysis of aquifer test data indicated an average hydraulic conductivity of 50 feet per day (Alta, 2012). Based on recent groundwater monitoring events conducted at the Site, the direction of horizontal groundwater flow is generally towards the east-southeast with a gradient of approximately 0.001 to 0.002. This horizontal flow direction has remained unchanged since 1991, when Site groundwater level monitoring started.


3.0 SUMMARY OF EXISTING DATA

The Site has been undergoing environmental investigation since 1989. Relevant environmental investigations of the Site are detailed in:

1. Site Conceptual Model, Winefield & Associates, Inc., March 15, 2010 2. Soil Gas Survey Report, Alta Environmental, September 6, 2011 3. Additional Soil Gas Survey Report, Alta Environmental, September 4, 2014 4. Well and Probe Installation, Groundwater Monitoring, and Health Risk Assessment

Report, Alta Environmental, August 10, 2015 5. Interim Offsite Assessment Report, Alta Environmental, September 9, 2016

3.1 Soil

3.1.1 Metals

Metal analyses have been performed on 292 soil samples; collected between 1991 and 2015 at depths ranging from 1 to 95 bgs. A summary of metal detections is shown in Table 1A. Arsenic, hexavalent chromium (“Cr-VI”), and thallium are the only metals that have been detected above screening levels. The following table shows statistical information on the metals detected above the screening levels.

Metals in Soil

Statistic Arsenic Cr-VI Thallium

Minimum Concentration (mg/kg) 1.9 0.18 1.1

Maximum Concentration (mg/kg) 140 52 27

Median Concentration (mg/kg) 4.2 0.73 2.95

Mean Concentration (mg/kg) 9.9 15.8 7.7

Number of Detections 54 12 12 Number of Detections above Screening Level

54 5 3

Screening Level 0.36 6.3 12

As shown in the table Cr-VI and thallium have only been detected 12 times each out of 292 samples, with 5 and 3 samples exceeding the screening level, respectively. For Cr-VI, the median concentration was below the screening level, but the mean concentration exceeded


the screening level. For thallium, the median and mean concentrations were below the screening level.

Arsenic has been detected 54 times out of 292 samples with all detections above the screening level. The median and mean arsenic concentrations were above the screening level, however, it should be noted that the natural background arsenic concentrations are likely to be above screening level. Bradford et al (1996) report the median arsenic concentration in California soils of 2.7 mg/kg, and an upper quartile median concentration of 4.7 mg/kg. Arsenic was detected above the upper quartile value in 23 samples, suggesting potential anthropogenic contributions to the arsenic concentrations.

The arsenic concentrations are plotted versus depth on the graph below. This plot shows that all arsenic concentrations at 5 feet bgs are below the upper quartile concentration in California soils. The low arsenic concentrations at 5 feet bgs are not consistent with a near surface release of arsenic. In addition, all arsenic detections above the upper quartile for California soils are found at depths of 10 feet bgs or deeper. Elevated arsenic concentrations are found throughout the Site, including areas where no plating operations have been historically performed. Based on the low arsenic concentrations at 5 feet bgs, it does not appear that there has been a near surface release and the elevated arsenic concentrations 10 feet and below may be naturally occurring.

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1 10 100 1000

Depth (fe

et)

Concentration (mg/kg)

Arsenic Concentration Vs Depth

ArsenicConcentration

Lower Quartile

Upper Quartile


3.1.2 Total Petroleum Hydrocarbons

Hydrocarbon analyses have been performed on 245 soil samples collected between 1991 and 2015 at depths ranging from 5 to 95 feet bgs. Samples were analyzed for total petroleum hydrocarbons as gasoline (“TPH-g”), diesel (“TPH-d”), motor oil (“TPH-o”), and total hydrocarbons (“TPH”). A summary of TPH detections is shown in Tables 1B and 1C. The following table shows statistical information on TPH detections.

TPH in Soil

Statistic TPH-g TPH-d TPH-o TPH

Minimum Concentration (mg/kg) 0.26 5.4 84 75

Maximum Concentration (mg/kg) 1,400 3,600 8,900 60,0000

Median Concentration (mg/kg) 42 320 520 1,227

Mean Concentration (mg/kg) 224 654 1,280 5,881

Number of Detections 25 29 15 34

Number of Detection Above Screening Level 12 22 1 --

All TPH detections above the screening level are located in areas where former hydrocarbon use has been documented. Elevated TPH at almost all sampling depths were detected in Borings L37, L31, and the HS series of borings which are all located in areas where former underground storage tanks. For TPH-g and TPH-d, the median and mean concentrations are greater than the screening level. For TPH-o, the median and mean concentrations are less than the screening level.

3.1.3 VOC

VOC analyses have been performed on 249 soil samples; collected between 1991 and 2015 from depths ranging from 1 to 187 feet bgs. A summary of VOC detections is shown in Tables 1D and 1E. Of the VOC detected, tetrachloroethene (“PCE”), trichloroethene (“TCE”), cis-1,2-dichloroethene (“cis-1,2-DCE”), and benzene exceeded their respective screening levels. The following table shows statistical information on VOC detections.


VOC in Soil

Statistic PCE TCE cis-1,2-DCE Benzene

Minimum Concentration (mg/kg) 0.002 0.0019 0.0025 0.27

Maximum Concentration (mg/kg) 3,200 11,400 1,550 19.9

Median Concentration (mg/kg) 0.355 0.56 0.175 1.7

Mean Concentration (mg/kg) 119 289 85 3.8

Number of Detections 130 163 38 12

Number of Detection Above Screening Level 39 46 4 6

The highest concentrations of PCE, TCE, cis-1,2-DCE, and benzene were detected in borings, BH-4 at 50 feet bgs, SS-11 at 1 foot bgs, SS-4 and 1 foot bgs, and SS-11 at 1 foot bgs, respectively. For PCE and TCE, the median concentration is below the screening but the mean is above the screening level. For cis-1,2-DCE, both the median and mean concentrations are below the screening level. For benzene, both the median and mean concentrations are above the screening level.

3.2 Soil Vapor

There have been 3 recent soil vapor investigation. Almost all of the soil vapor probes that were installed during the recent investigations have been nested with permanent probes installed throughout the entire thickness of the unsaturated zone. Most of the probes have been sampled only once since their installation. A summary of the soil vapor sampling conducted since 2011 is shown in the table below.

2011-2016 Soil Vapor Sampling Summary

Year Location Probe IDs Report

2011 On-Site only (25 total locations) VP-1 through VP-18, VP-21, VP-24 Alta (2011)

2014 3 on-Site and 4 off-Site west of Crenshaw VP-25, VP-26, VP-28 through VP-31, Alta (2014)

2016 2 on-Site, 6 off-Site west of Crenshaw, 6 off-Site east of Crenshaw

VP-42, VP-46 through VP-52 Alta (2016)


The 2011 data will be discussed separately from the 2014 and 2016 data. The soil vapor probes sampled in 2011 are all on-Site, the oldest dataset, and the concentrations are likely to have changed most, as the on-Site SVE system has been in continuous operation since these older samples were collected. However, these data do provide a snapshot of on-Site conditions in 2011.

The data from 2014 and 2016 are from off-Site locations to the east, except for 5 on-Site locations. These data are analyzed together since they were collected within a 2 year period and the off-Site data are not likely to be significantly affected by the on-Site SVE system.

3.2.1 On-Site Distribution of PCE and TCE (2011)

The concentrations of individual VOC detected in on-Site soil vapor during 2011 are highly variable, from non-detectable up to 17,000,000 micrograms per cubic meter (“g/m3”) (Table 2). The soil vapor probes were installed in proximity to the previously defined Areas of Potential Concern (“AOPC”) (Winefield 2010, shown on Figure 2). However, there are extensive areas along the eastern side and southwest corner of the Site where no soil vapor probes have been installed.

Spatially, the highest VOC concentrations are in the probes are clustered in several AOPC including:

VP-1 (AOPC 1) VP-11 and VP-12 (AOPC 3) VP-17 and VP-18 (AOPC-5)

The vertical distribution of TCE in soil vapor in these 3 AOPC are shown on the graphs below. In general, TCE concentrations increase with depth in each AOPC with the highest concentrations at depths below 50 feet. Notable exceptions to this pattern are in VP-1 (AOPC 1) and VP-17 (AOPC 5) where the TCE concentrations are highest near the surface and consistently decrease with depth.


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Depth (fe

et)

Concentration (g/m3)

AOPC 1 - TCE in Soil Vapor

VP‐1

VP‐2

VP‐3

VP‐4

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Depth (fe

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VP‐10

VP‐11

VP‐12

VP‐52


3.2.2 Off-Site Distribution of PCE and TCE (2014 – 2016)

The soil vapor probes installed in 2014 and 2016 were primarily located to the east of the Site, with the exception of 5 probes installed in the eastern and central part of the Site. The VOC concentrations in the on-Site probes sampled in 2014 (VP-28, VP-29, and VP-30) may have decreased as a result of ongoing soil vapor extraction between the 2014 and 2016 events.

Horizontal Distribution

PCE concentrations in the one data set collected to-date from the area east of Crenshaw Boulevard exceed the commercial screening level to the north of 247th Street and west of Dormant Avenue. The land use north of 247th Street is primarily commercial, and is primarily residential along and south of 247th Street. All of the soil vapor probes to the east of Crenshaw Boulevard have PCE above the residential screening level of 230 g/m3 in the one data collection effort conducted in this area. Therefore, PCE impacts at 5 feet bgs have not been delineated, nor confirmed, and additional delineation is needed to the east of Pennsylvania Avenue, to the south of 248th Street, and to the north of 246th Street.

The PCE concentration contour map at 5 feet bgs (Figure 5) indicates that soil vapor has been impacted above the commercial screening level of 2,000 g/m3 between the Site and Crenshaw Boulevard. Both the PCE and TCE contour maps show concentration highs on the Lexus property, indicating that there may be a source area in the vicinity of Soil Vapor Probe VP-49.

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Depth (fe

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VP‐16

VP‐17

VP‐18


The TCE concentration contour map at 5 feet bgs (Figure 6) indicates that the area east of Crenshaw Boulevard where concentrations exceed the commercial and residential screening coincides with the area where PCE concentrations exceed the commercial and residential screening levels. The extent of TCE impacts has not been confirmed from the one sampling event, nor delineated to the residential screening level, and it appears that the area requiring further delineation is similar to the area requiring further PCE delineation.

Vertical Distribution

The following graphs show concentration variations with depth for individual nested soil vapor probes, and are grouped into probes to the east and to the west of Crenshaw.

To the west of Crenshaw, the concentration versus depth profiles for PCE and TCE suggest diffusive transport away from a potential source area in the vicinity of Soil Vapor Probe VP-49. PCE and TCE concentrations are highest and have no distinct trend with depth in the Soil Vapor VP-49 probes. The data from the remaining 5 soil vapor borings west of Crenshaw indicate that there increasing concentration with depth in 3 of the soil vapor borings (VP-27, VP-47, and VP50). This pattern is interpreted to result from unsaturated zone diffusive transport away from the Soil Vapor Probe VP-49 source area, with concentrations lowest near the surface because of mass loss to the atmosphere. There is a moderate decreasing trend with depth in Soil Vapor Probe VP-42 which suggests a potential newer, second source area that is separate from the VP-49 source area.

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Dep

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Soil Vapor PCE Concentrations West of Crenshaw

VP‐27

VP‐31

VP‐42

VP‐47

VP‐49

VP‐50


To the east of Crenshaw Boulevard, PCE and TCE concentrations in the nested soil vapor probes do not show a strong trend with depth with the exception of Soil Vapor Probe VP-35. The lack of trend with depth does not support groundwater degassing as a source of the VOC in the unsaturated zone. If groundwater degassing were contributing to VOC in the unsaturated zone, concentrations would be expected to increase with depth (an upward diffusion profile)

There are 3 probes that show a pronounced PCE (and to a lesser extent TCE) concentration high at 25 feet bgs, and the reason for this is uncertain. The probes are spaced 500 to 1,000 feet apart, and a geologic explanation is not evident from a preliminary review of the boring logs.

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Dep

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Soil Vapor TCE Concentrations West of Crenshaw

VP‐27

VP‐31

VP‐42

VP‐47

VP‐49

VP‐50

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Dep

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Soil Vapor PCE Concentrations East of Crenshaw

VP‐33VP‐34VP‐35VP‐38


In Soil Vapor Probe VP-35, the TCE concentration increases with depth, suggesting an upward diffusion for VOC degassing from groundwater or that there is another source area in proximity to this soil vapor sampling location. A preliminary evaluation of the boring logs in this area does not suggest a geologic reason for the vertical concentration trend in Soil Vapor Probe VP-35. The borings in this area all have finer-grained material in the upper 30 feet (silt, clay, silty sand) and primarily sand below 30 feet.

Soil Vapor Probe VP-35 was resampled in April 2018 to confirm the anomalously high TCE concentrations detected in 2016 (data shown on Table 1). The 2016 and 2018 sampling results from Soil Vapor Probe VP-35 are compared on the graph below. TCE concentrations in 2018 are 4 to 100 times lower compared to samples collected in 2016 for depths less than 25 feet bgs. TCE concentrations at 45 feet and 65 feet bgs are similar during the 2 sampling events. At 85 feet bgs, TCE concentrations were about 16 times lower in 2018. This result leads to the conclusion that source of the anomaly be further investigated.

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Soil Vapor TCE Concentrations East of Crenshaw

VP‐33 VP‐34VP‐35 VP‐38


3.3 Groundwater

Investigation and groundwater monitoring has been on-going at the Site since 1991. Based on historical assessments, VOC originating from the Site has impacted the regional water table aquifer (“RWTA”) beneath and downgradient of the Site. The depth to water measurements, corresponding water surface elevations, and measured field parameters are summarized in Table 3.

The RWTA is first encountered at approximately 90 feet bgs. The direction of groundwater flow at the Site is to the east-southeast (Figure 7). The horizontal hydraulic gradient between Monitoring Wells MW-7R and MW-26 is 0.002.

The primary constituent of concern in groundwater at the Site is TCE. In addition, other VOC detected at the Site include “PCE, 1,1,1-trichloroethane, cis-1,2-DCE, trans-1,2-dichloroethene (“trans-1,2-DCE”), 1,1-dichloroethene (“1,1-DCE”), 1,2-dichloroethane, 1,1,2-trichloroethane, vinyl chloride (“VC”), benzene, toluene, and ethylbenzene. In addition, low concentrations of hexavalent chromium, 1,4-dioxane, and perchlorate have been detected.

In the shallow RWTA (less than 100 feet bgs), the plume of VOC impacted groundwater is oriented east-west in the direction of groundwater flow (Figure 8). The horizontal extent of groundwater impacts has not been delineated, and impacts extend to the east of Pennsylvania Avenue.

In the intermediate RWTA (between 100 and 150 feet bgs), the plume of VOC impacted groundwater is also oriented east-west in the direction of groundwater flow (Figure 9). Intermediate RWTA monitoring wells have only been installed on-Site, and the horizontal extent of groundwater impacts has not been delineated.

0

20

40

60

80

100

Dep

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Comparison of TCE Concentrations in VP-35

Jun‐16

Apr‐18


The on-Site vertical extent of VOC impacts to groundwater is less than 260 feet bgs. The off-Site vertical extent of groundwater impacts is not known as only shallow RWTA wells are present downgradient (to the east) of the Site.

4.0 SCOPE OF WORK

The RWQCB’s August 28, 2018 letter requires that the lateral and vertical extent of soil, soil gas, and groundwater impacts be delineated. Impacts to soil vapor and groundwater extend more than 1,000 feet from the Site; with data from some areas being sparse or non-existent. Because of the extensive investigations necessary to meet the RWQCB’s requirements, the scope of work will be conducted in consecutive phases prioritized by human health risk potential. Each phase of work may be performed as a stand-alone investigation with report or conducted consecutively, depending upon a number of factors to be determined.

The phases of investigation that make up the scope of the Work Plan include:

1. Delineate the extent of VOC impacts to soil vapor and the vapor intrusion potential to the east of Crenshaw Boulevard;

2. Collect additional data to evaluate current VOC and metal impacts to on-Site soil and VOC impacts to on-Site soil vapor and the migration of soil vapor both off-Site and on-Site;

3. Delineate the extent of VOC and metal impacts to soil and VOC impacts to soil vapor to the north, west, south of the Site and east of the Site to Crenshaw Boulevard;

4. Delineate the horizontal extent of the perched groundwater layer and evaluate VOC, metals, 1,4-dioxane, hexavalent chromium, and perchlorate impacts to perched groundwater; and

5. Delineate the horizontal and vertical extent of VOC, metals, 1,4-dioxane, hexavalent chromium, and perchlorate impacts to groundwater downgradient (east) of the Site.

Sampling and analytical procedures and health and safety practices will be followed in accordance with the Sampling and Analytical Plan (“SAP” Appendix A), Quality Assurance Project Plan (“QAPP” Appendix B), and Health and Safety Plan (“HASP” Appendix C).

4.1 Screening Levels

The compounds of potential concern (“COPC”) that have been detected in soil, soil vapor, and groundwater are PCE, TCE, cis-1,2-DCE, trans-1,2-DCE, 1,1-DCE, and VC. The screening levels for the COPC are listed in the following table, along with citations for the screening level source document.


Screening Levels for COPC in Various Media

COPC Media Residential Screening Level Commercial

Screening Level Source

PCE

Soil 0.59 mg/kg 2.7 mg/kg HHRA Note No. 3 (Jan. 2018)

Soil Vapor 230 g/m3 2,000 g/m3

HHRA Note No. 3 (Jan. 2018) using DTSC-modified Indoor Air RSL with an attenuation factor of 0.002 (residential) and 0.001 (commercial)

Groundwater 5 g/L 5 g/L State Water Resources Control Board Maximum Contaminant Level (Jan. 2016)

TCE

Soil 0.94 mg/kg 6.0 mg/kg USEPA Regional Screening Levels (Nov. 2017)

Soil Vapor 105 g/m3 880 g/m3

HHRA Note No. 3 (Jan. 2018) using USEPA Air Regional Screening Levels (Nov. 2017) with an attenuation factor of 0.002 (residential) and 0.001 (commercial)


Cis-1,2-DCE

Soil Not applicable Not applicable

Soil Vapor Not applicable Not applicable

Groundwater 6.0 g/L 6.0 g/L State Water Resources Control Board Maximum Contaminant Level (Jan. 2016)

Trans-1,2-DCE

Soil Not applicable Not applicable

Soil Vapor Not applicable Not applicable



Screening Levels for COPC in Various Media (continued)

COPC Media Residential Screening Level Commercial

Screening Level Source

1,1-DCE

Soil 230 mg/kg 1,000 mg/kg USEPA Regional Screening Levels (Nov. 2017)

Soil Vapor g/m3 g/m3



Vinyl Chloride

Soil 0.0088 mg/kg 0.15 mg/kg HHRA Note No. 3 (Jan. 2018)

Soil Vapor 4.75 g/m3 g/m3



4.2 Delineation of Soil Vapor and Potential Vapor Intrusion East of Crenshaw

The contour maps of PCE and TCE concentrations at 5 feet bgs for samples collected primarily off-Site in 2014 and 2016 show impacts to soil vapor above both commercial and residential screening levels extend to the east of Crenshaw Boulevard (Figures 5 and 6). To further delineate the lateral and vertical extent of TCE and PCE impacts to soil vapor and evaluate the potential for vapor intrusion to commercial and residential buildings, nested, permanent soil vapor probes will be installed in 25 locations (VP-53 through VP-77 on Figure 10). Nested soil vapor probes will be installed in the 25 soil vapor borings at the following depths (Figure 10).

At 16 boring locations, nested soil vapor probes will be installed at 5 feet and 15 feet bgs in each boring

At 9 boring locations, nested soil vapor probes will be installed at 5, 15, 30, 45, 65, and 85 feet bgs in each boring

Soil vapor probes will be installed and sampled as detailed in the SAP (Appendix A), and in accordance with California EPA’s Advisory Active Soil Gas Investigations (2012) and Appendix G of Vapor Intrusion Guidance (2011).


After installation, both the existing soil vapor probes (VP-33 through VP-37 on Figure 10) and new soil vapor probes (VP-53 through VP-77 on Figure 10) will be sampled. Soil vapor samples will be analyzed for VOC by EPA Method 8260B using a mobile laboratory. Analytical procedures are detailed in the QAPP (Appendix B).

4.3 On-Site Soil and Soil Vapor

The existing on-Site soil vapor probes are clustered around the previously defined AOPCs, and there is little or no soil vapor data in other areas of the Site. In addition, the on-Site soil vapor probes have not been sampled since 2011. To evaluate current soil and soil vapor conditions, vapor intrusion potential, and the migration of VOC impacted soil vapor both onto and off the Site, nested, permanent soil vapor probes will be installed in 21 locations (VP-78 through VP-97 and VP-130 on Figure 11). Nested soil vapor probes will be installed in the at the following depths (Figure 11).

At 18 boring locations, nested soil vapor probes will be installed at 5, 15, 30, 45, 65, and 85 feet bgs in each boring

At 3 boring locations inside the building in the northwest corner of the Site, nested soil vapor probes will be installed at 5 feet and 15 feet bgs in each boring

Soil samples will also be collected from borings that are either in previously defined AOPC or potential source areas that have not been previously defined. These include Borings VP-93 through VP-97. Soil samples will be collected at the same depths as the soil vapor probes. Field screening of soil samples from all borings will also be performed using a photoionization detector. Additional soil samples for VOC analysis may be collected as warranted by field screening results.

Soil vapor probes will be installed and sampled as detailed in the SAP (Appendix A), and in accordance with California EPA’s Advisory Active Soil Gas Investigations (2012) and Appendix G of Vapor Intrusion Guidance (2011).

After installation, the existing soil vapor probes (VP-1 through VP-18, VP-21, VP-24, VP-28 through VP-30, VP-51, and VP-52 on Figure 11) and the new soil vapor probes (VP-78 through VP-97 and VP-130 on Figure 11) will be sampled. Soil vapor samples will be analyzed for VOC by EPA Method 8260B using a mobile laboratory. Soil samples will be analyzed for VOC by EPA Method 8260B, TPH by EPA Method 8015M, metals by EPA Method 6010B, Cr-VI by EPA Method 7196A, and perchlorate by EPA Method 6850. Analytical procedures are detailed in the QAPP (Appendix B).


4.4 Delineation of Off-Site Soil and Soil Vapor Impacts

Delineation of off-Site soil vapor impacts is currently limited to the 9 soil vapor borings (VP-25, VP-26, VP-31, VP-42, and VP-46 through VP-50 on Figure 11) located in the commercial area immediately east of the Site to Crenshaw Boulevard. There are little to no off-Site soil vapor data to the north, south, or west of the Site.

To evaluate the horizontal and vertical extent of off-Site soil vapor impacts, and to identify other potential VOC source areas surrounding the Site, nested, permanent soil vapor probes will be installed in 36 locations (VP-98 through VP-133 on Figure 11). Nested soil vapor probes will be installed in the 33 soil vapor borings at the following depths (Figure 11).

At 9 boring locations north and northeast of the Site across Skypark Drive (VP-98 through VP-104, VP-132 and VP-133 on Figure 11), nested soil vapor probes will be installed at 5, 15, 30, 45, 65, and 85 feet bgs in each boring

At 4 boring locations between the Site and Crenshaw Boulevard (VP-105 through VP-108 on Figure 11), nested soil vapor probes will be installed at 5, 15, 30, 45, 65, and 85 feet bgs in each boring

At 14 boring locations south and southeast the Site (VP-109 through VP-121, VP-124, and VP-131 on Figure 11), nested soil vapor probes will be installed at 5, 15, 30, 45, 65, and 85 feet bgs in each boring on Zamperini Field

At 8 boring locations west the Site (VP-122, VP-123, V-125 through VP-130 on Figure 11), nested soil vapor probes will be installed at 5, 15, 30, 45, 65, and 85 feet bgs in each boring on the Lowes property

Soil samples will be collected from borings in proximity to suspected source areas including VP-107, VP-108, VP-132, and VP-133. Soil samples will also be collected in each boring at the same depths as the soil vapor probes. Field screening of soil samples from all borings will also be performed using a photoionization detector. Additional soil samples for VOC analysis may be collected as warranted by field screening results.

Soil vapor samples will be analyzed for VOC by EPA Method 8260B using a mobile laboratory. Soil samples will be analyzed for VOC by EPA Method 8260B, Cr-VI by EPA Method 7196A, and perchlorate by EPA Method 6850.

4.5 Delineation of Perched Groundwater

As documented in Alta (2016), a perched groundwater layer has been encountered at approximately 60 feet bgs (30 feet above the regional water table) to the southwest of the Site (approximate location shown on Figure 12). The perched groundwater layer was encountered while drilling soil vapor borings VP-42 and VP-50, however, the lateral extent of the perched groundwater layer is currently not known. Reconnaissance groundwater


samples were collected from the perched layer during drilling of VP-42 and VP-50, and elevated concentrations of PCE, TCE, 1,1-DCE, and 1,1,1-TCA were detected in samples from both borings. No monitoring wells have been installed in the perched groundwater layer.

Delineation of the extent of the perched groundwater layer will be performed primarily during drilling of the soil vapor borings in the area where the perched groundwater may be present. These include VP-108 on the Lexus property, VP-109 through VP-116 and VP-131 on Zamperini Field (Figure 11), and VP-70 and VP-74 east of Crenshaw Boulevard (Figure 10). A reconnaissance groundwater sample will be collected in each boring where the perched groundwater layer is encountered. The procedures for collecting reconnaissance groundwater samples as detailed in the SAP (Appendix A).

In borings where perched groundwater is encountered, procedures will be implemented to ensure that an artificial pathway is not created for perched groundwater to directly enter the regional groundwater. For example, if soil vapor probes are to be installed below the perched layer, conductor casing will be installed into the low permeability layer below perched groundwater, and the probes set below the perched layer through the conductor casing.

After evaluating its extent, 3 monitoring wells will be installed in the perched groundwater layer. Preliminary monitoring well locations are shown on Figure 12, however, the final locations will be selected based on the extent of the perched layer. The monitoring wells will be installed with a screened interval between approximately 50 and 60 feet bgs, and care will be taken so that the low permeability layer causing groundwater perching will not be fully penetrated during drilling.

The monitoring wells will be installed, developed and sampled as discussed on the SAP (Appendix A). Reconnaissance groundwater and monitoring well samples will be analyzed for VOC using EPA Method 8260B.

The boring and monitoring well data collected as a part of investigating the perched groundwater will also be used to evaluate the interaction between the perched groundwater layer and the underlying regional groundwater. Potential interactions scenarios are (i) vertical migration through the low permeability layer that causes groundwater perching, (ii) horizontal migration to the edge of the low permeability layer followed by vertical migration to the regional groundwater table, or (iii) a combination of these scenarios. The flow direction, VOC concentrations in the perched layer, and the pattern of VOC concentrations in RWTA will be used to analyze potential interactions between the 2 groundwater bodies. In addition to the proposed monitoring wells in the regional groundwater aquifer (discussed in the next section and shown on Figure 13), other RWTA monitoring wells may be installed as warranted by the interpretation of the perched groundwater data in the future.


4.6 Delineation of the Horizontal and Vertical Extent of Groundwater Impacts

Monitoring wells installed in the RWTA indicate that the horizontal extent of VOC impacts to groundwater extend at least 1,700 feet east of the Site and beyond Pennsylvania Avenue (Figure 8). The vertical extent of impacts to the RWTA is less than 260 feet on-Site but has not been delineated downgradient (to the east) of the Site.

To evaluate the horizontal extent of impacts to the shallow RWTA, 6 monitoring wells will be installed along and to the east of Pennsylvania Avenue (MW-28 through MW-33 on Figure 13). These monitoring wells will be installed with a screened interval between approximately 90 feet and 100 feet bgs.

At the intermediate depth in the RWTA (between approximately 110 feet and 150 feet bgs), the vertical extent of impacts will be evaluated by installing 5 monitoring wells with screened intervals between 140 feet and 150 feet bgs (MW-34 through MW-38 on Figure 13). Each of these wells will be paired with an existing or proposed shallow RWTA well.

The vertical extent of impacts in the deep RWTA (between approximately 150 feet and 260 feet bgs) will be evaluated by installing a monitoring well immediately to the east of the Site adjacent to existing shallow RWTA well MW-12 (MW-39 on Figure 13). This well will be screened between 240 feet and 250 feet bgs.

Additional shallow RWTA wells may be necessary in the future based on the interpretation of the perched groundwater data. The locations of these wells would be designed to enhance the understanding to the interaction between the perched groundwater layer and the RWTA (as necessary).

The monitoring wells will be installed, developed and samples as discussed on the SAP (Appendix A). Groundwater samples will be analyzed for VOC using EPA Method 8260B.

5.0 REPORTING

Depending upon implementation sequence, individual reports may be submitted at the end of each phase of investigation, and the findings and conclusions will be specific to each phase. The maximum reports to be submitted may include:

1. Extent of soil vapor impacts and vapor intrusion assessment east of Crenshaw Boulevard;

2. On-Site soil vapor conditions and soil vapor migration on to and off of the Site; 3. Delineation of off-Site soil vapor impacts and evaluation of potential source areas

to the west of Crenshaw Boulevard and north, south, east, and west of the Site.


4. Delineation of the extent of the perched groundwater layer and evaluation of VOC impacts to perched groundwater; and

5. Delineation of the horizontal and vertical extent of impacts to the RWTA. Each report will include tabulation of the data, display of data on figures (analytical data, geologic cross section, contour maps, etc.), and data interpretation of the data with respect to the specific investigation objectives. The reports will also include boring logs, field activity sheets, and laboratory analytical data as appendices. Recommendation for additional investigation will be made as appropriate.

After completion of all 5 phases of the Work Plan, and an Updated Site Conceptual Model will be prepared and submitted.

6.0 SCHEDULE

Implementation of the first phase of the Work Plan will begin immediately after RWQCB approval of the Work Plan. A meeting has been requested by representatives of Hi-Shear and the RWQCB personnel in mid-October to discuss approval of the work plan and scope implementation sequence. Assuming that each investigation phase will be performed consecutively, the entire Work Plan will take approximately 2 years to complete. A schedule of major tasks in each phase is included as Appendix D and is subject to revision.


7.0 REFERENCES

Alta (2011). Soil Gas Survey Report, Alta Environmental, September 6, 2011.

Alta (2014). Additional Soil Gas Survey Report, Alta Environmental, September 4, 2014.

Alta (2016). Interim Offsite Assessment Report, Alta Environmental, September 9, 2016.

BBL (2002). Groundwater Flow Model Report Hi-Shear Corporation, 2600 Skypark Drive, Torrance, California, Blasland Bouck and Lee, Inc., 2002. California Department of Water Resources, Southern District, Bulletin 104 – Planned Utilization of the Ground Water Basins of the Coastal Plain of Los Angeles County, June, 1961.

Interim Offsite Assessment Report, Alta Environmental, September 9, 2016

Soil Gas Survey Work Plan, Hi-Shear Corporation, 2600 Skypark Drive, Torrance, California, May 31, 2012

Well and Probe Installation, Groundwater Monitoring, and Health Risk Assessment Report, Alta Environmental, August 10, 2015

Winefield (2010). Site Conceptual Model, Winefield & Associates, Inc., March 15, 2010.

TABLES

Antinomy Arsenic Barium Beryllium Cadmium Chromium Cr-VI Cobalt Copper Lead Mercury Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc

13.5 4/11/91 NA 9.7 NA 0.75 6.7 43 NA NA 31 19 0.09 NA 81 ND ND ND NA 6260.5 4/11/91 NA 19 NA 0.5 3.9 24 NA NA 28 16 0.06 NA 22 ND ND 11 NA 5761.5 4/11/91 NA 19 NA 0.51 3.7 23 NA NA 29 15 0.1 NA 23 ND ND ND NA 57

15.5 4/11/91 NA 21 NA 1.1 4 59 NA NA 32 24 0.04 NA 54 ND ND ND NA 7725.5 4/11/91 NA 15 NA 0.72 4.9 49 NA NA 33 17 0.03 NA 48 ND ND 12 NA 7935.5 4/11/91 NA 8.0 NA ND 2 14 NA NA 5.8 6.7 0.01 NA 28 ND ND ND NA 3850.5 4/11/91 NA 9.2 NA ND 2.1 14 NA NA 5.3 5.1 0.05 NA 10 ND ND ND NA 26

25.5 4/11/91 NA 22 NA 1.1 5.4 65 NA NA 35 28 0.06 NA 50 ND ND 13 NA 8935.5 4/11/91 NA 18 NA 0.5 2 18 NA NA 7.7 8.4 0.02 NA 27 ND ND ND NA 32

50 4/11/91 NA 6.2 NA ND 1.5 13 NA NA 6.1 6.5 0.02 NA 8.3 ND ND ND NA 25

25.5 4/11/91 NA 20 NA 1.1 5.6 93 NA NA 41 34 0.15 NA 65 ND ND 27 NA 13035.5 4/11/91 NA 16 NA 0.54 1.8 17 NA NA 5.4 8.5 0.04 NA 17 ND ND ND NA 3145.5 4/11/91 NA ND NA ND 1.7 13 NA NA 3.7 4.9 0.06 NA 10 ND ND ND NA 24

VB-2 5 4/10/01 ND 4.2 560 0.63 2.7 52 52 8.5 31 4.1 0 2.2 45 3.4 ND ND 94 58

VPO-2 5 4/9/01 ND 3.6 450 0.52 2.3 49 49 7.4 24 3.7 0 3.4 35 3.1 ND ND 100 47

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170

Table 1A

Hi-Shear Corporation ProjectSoil, Soil Vapor, and Groundwater Delineation Work Plan

Metals Concentrations in Soil

Sampling Date

Concentration (mg/kg)Depth (ft bgs )

Sample ID

HS1

HS2

HS3

HS4

Industrial Screening Level**

Background Levels for

California Soils*

Hi‐Shear Corportion ProjectSoil, Soil Vapor, and Groundwater Delineation Work PlanSeptember 2018


Table 1A



Sampling Date


Sample ID

5 7/3/08 ND ND 950 ND ND 64 ND ND 47 ND ND ND 66 ND ND ND 130 8210 7/13/08 ND ND 580 ND ND 55 ND ND 37 ND ND ND 70 ND ND ND 120 8515 7/13/08 ND ND 580 ND ND 100 ND ND 67 ND ND ND 71 ND ND ND 170 13020 7/13/08 ND ND 500 ND ND 58 ND ND 66 ND ND ND 26 ND ND ND 78 12025 7/13/08 ND ND 610 ND ND 14 ND ND 15 ND ND ND 6.4 ND ND ND 48 4230 7/13/08 ND ND 870 ND ND 34 ND ND 22 ND ND ND 10 ND ND ND 51 57

5 7/3/08 ND ND 480 ND ND 31 ND ND 49 ND ND ND 37 ND ND ND 70 7310 7/13/08 ND ND 950 ND ND 63 ND ND 52 ND ND ND 60 ND ND ND 120 8615 7/13/08 ND ND 480 ND ND 94 ND ND 48 ND ND ND 56 ND ND ND 140 11020 7/13/08 ND ND 470 ND ND 81 ND ND 43 ND ND ND 46 ND ND ND 120 10025 7/13/08 ND ND 360 ND ND 24 ND ND 15 ND ND ND 15 ND ND ND 49 5230 7/13/08 ND ND 110 ND ND 14 ND ND 3.5 ND ND ND ND ND ND ND 56 29

5 6/18/08 ND ND 900 ND ND 59 ND ND 40 ND ND ND 52 ND ND ND 120 7710 6/18/08 ND ND 730 ND ND 86 ND ND 60 ND ND ND 69 ND ND ND 150 12015 6/18/08 ND ND 1,100 ND ND 74 ND ND 42 ND ND ND 58 ND ND ND 120 9220 6/18/08 ND ND 420 ND ND 80 ND ND 38 ND ND ND 39 ND ND ND 110 11025 6/18/08 ND ND 330 ND ND 38 ND ND 20 ND ND ND ND ND ND ND 240 3630 6/18/08 ND ND 95 ND ND 13 ND ND ND ND ND ND 2.4 ND ND ND 87 32

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170

L4

L5

L6



California Soils*



Table 1A



Sampling Date


Sample ID

5 6/25/08 ND ND 1,100 ND ND 94 ND ND 68 ND ND ND 71 ND ND ND 170 11010 6/25/08 ND ND 1,000 ND ND 79 ND ND 52 ND ND ND 68 ND ND ND 140 10015 6/25/08 ND ND 2,100 ND ND 120 ND ND 61 ND ND ND 74 ND ND ND 180 13020 6/25/08 ND ND 610 ND ND 43 ND ND 33 ND ND ND 10 ND ND ND 65 5725 6/25/08 ND ND 180 ND ND ND ND ND ND ND ND ND ND ND ND ND 32 1730 6/25/08 ND ND 77 ND ND 12 ND ND ND ND ND ND ND ND ND ND 75 27

5 6/25/08 ND ND 2,000 ND ND 77 ND ND 42 ND ND ND 55 ND ND ND 150 8010 6/25/08 ND ND 810 ND ND 65 ND ND 42 ND ND ND 58 ND ND ND 120 9615 6/25/08 ND ND 660 ND ND 90 ND ND 49 ND ND ND 63 ND ND ND 150 11020 6/25/08 ND ND 400 ND ND 84 ND ND 42 ND ND ND 44 ND ND ND 120 11025 6/25/08 ND ND 98 ND ND 13 ND ND ND ND ND ND ND ND ND ND 46 3730 6/25/08 ND ND 70 ND ND ND ND ND ND ND ND ND ND ND ND ND 15 ND

5 6/24/08 ND ND 940 ND ND 61 ND ND 42 ND ND ND 51 ND ND ND 130 7210 6/24/08 ND ND 760 ND ND 42 ND ND 31 ND ND ND 54 ND ND ND 100 7015 6/24/08 ND ND 820 ND ND 64 ND ND 170 ND ND ND 43 ND ND ND 110 15020 6/24/08 ND ND 230 ND ND 11 ND ND 37 ND ND ND ND ND ND ND 48 4925 6/24/08 ND ND 75 ND ND ND ND ND ND ND ND ND ND ND ND ND 29 5.630 6/24/08 ND ND 40 ND ND ND ND ND ND ND ND ND ND ND ND ND 8.7 ND

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170



California Soils*

L12

L13

L11



Table 1A



Sampling Date


Sample ID

5 6/24/08 ND ND 1,000 ND ND 67 ND ND 41 ND ND ND 53 ND ND ND 140 7410 6/24/08 ND ND 890 ND ND 50 ND ND 40 ND ND ND 59 ND ND ND 110 8115 6/24/08 ND ND 120 ND ND 11 ND ND 10 ND ND ND ND ND ND ND 51 4120 6/24/08 ND ND 430 ND ND 73 ND ND 52 ND ND ND 58 ND ND ND 140 11025 6/24/08 ND ND 54 ND ND ND ND ND ND ND ND ND ND ND ND ND 19 ND30 6/24/08 ND ND 72 ND ND ND ND ND ND ND ND ND ND ND ND ND 28 8.6

5 7/16/08 ND ND 780 ND ND 60 ND ND 41 ND ND ND 54 ND ND ND 100 8610 7/16/08 ND ND 680 ND ND 63 ND ND 35 ND ND ND 51 ND ND ND 110 8215 7/16/08 ND ND 500 ND ND 57 ND ND 31 ND ND ND 45 ND ND ND 110 8620 7/16/08 ND ND 830 ND ND 74 ND ND 37 ND ND ND 50 ND ND ND 130 9525 7/16/08 ND ND 290 ND ND 51 ND ND 15 ND ND ND 23 ND ND ND 84 6930 7/16/08 ND ND 440 ND ND 28 ND ND 18 ND ND ND 14 ND ND ND 60 50

5 7/15/08 ND ND 950 ND ND 74 ND ND 47 ND ND ND 65 ND ND ND 130 9810 7/15/08 ND ND 570 ND ND 73 ND ND 40 ND ND ND 63 ND ND ND 120 9915 7/15/08 ND ND 840 ND ND 71 ND ND 36 ND ND ND 45 ND ND ND 130 9520 7/15/08 ND ND 300 ND ND 16 ND ND 9.7 ND ND ND 8.7 ND ND ND 45 9825 7/15/08 ND ND 130 ND ND 8.7 ND ND ND ND ND ND ND ND ND ND 27 8.730 7/15/08 ND ND 140 ND ND 15 ND ND ND ND ND ND ND ND ND ND 28 8.2

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170



California Soils*

L14

L15

L16



Table 1A



Sampling Date


Sample ID

5 7/8/08 ND ND 950 ND ND 98 ND ND 57 ND ND ND 74 ND ND ND 180 10010 7/8/08 ND ND 820 ND ND 94 ND ND 73 ND ND ND 200 ND ND ND 160 13015 7/8/08 ND ND 440 ND ND 88 ND ND 51 ND ND ND 73 ND ND ND 150 11020 7/8/08 ND ND 1,300 ND ND 58 ND ND 20 ND ND ND 39 ND ND ND 80 79

5 7/8/08 ND ND 1,000 ND ND 110 ND ND 52 ND ND ND 69 ND ND ND 160 9610 7/8/08 ND ND 540 ND ND 72 ND ND 66 ND ND ND 71 ND ND ND 120 13015 7/8/08 ND ND 300 ND ND 110 ND ND 57 ND ND ND 73 ND ND ND 170 13020 7/8/08 ND ND 150 ND ND 54 ND ND 23 ND ND ND 25 ND ND ND 110 7225 7/8/08 ND ND 140 ND ND 33 ND ND 6.4 ND ND ND ND ND ND ND 66 4830 7/8/08 ND ND 40 ND ND ND ND ND ND ND ND ND ND ND ND ND 10 ND

5 7/14/08 ND ND 810 ND ND 60 ND ND 38 ND ND ND 43 ND ND ND 110 8910 7/14/08 ND ND 460 ND ND 68 ND ND 47 ND ND ND 58 ND ND ND 130 10015 7/14/08 ND ND 340 ND ND 52 ND ND 29 ND ND ND 28 ND ND ND 100 7820 7/14/08 ND ND 95 ND ND 14 ND ND 2.4 ND ND ND ND ND ND ND 54 3225 7/14/08 ND ND 120 ND ND 2.6 ND ND ND ND ND ND ND ND ND ND 45 3.230 7/14/08 ND ND 59 ND ND ND ND ND ND ND ND ND ND ND ND ND 6.8 ND

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170


California Soils*


L17

L18

L19



Table 1A



Sampling Date


Sample ID

5 7/7/08 ND ND 1,100 ND ND 110 ND ND 72 ND ND ND 90 ND ND ND 190 13010 7/17/08 ND ND 1,200 ND ND 130 ND ND 84 ND ND ND 120 ND ND ND 220 17015 7/17/08 ND ND 1,300 ND ND 120 ND ND 78 ND ND ND 79 ND ND ND 160 14020 7/17/08 ND ND 300 ND ND 44 ND ND 26 ND ND ND 23 ND ND ND 94 11025 7/17/08 ND ND 160 ND ND 51 ND ND 5.2 ND ND ND 5 ND ND ND 100 4330 7/17/08 ND ND 47 ND ND ND ND ND ND ND ND ND ND ND ND ND 14 ND

5 7/11/08 ND ND 1,000 ND ND 110 ND ND 67 ND ND ND 95 ND ND ND 180 12010 7/11/08 ND ND 690 ND ND 62 ND ND 40 ND ND ND 68 ND ND ND 110 8415 7/11/08 ND ND 820 ND ND 110 ND ND 58 ND ND ND 84 ND ND ND 170 13020 7/11/08 ND ND 2,200 ND ND 73 ND ND 20 ND ND ND 25 ND ND ND 90 8125 7/11/08 ND ND 60 ND ND ND ND ND ND ND ND ND ND ND ND ND 9.6 ND30 7/11/08 ND ND 78 ND ND 7 ND ND ND ND ND ND ND ND ND ND 30 9.5

5 7/7/08 ND ND 430 ND ND 31 ND ND 61 ND ND ND 49 ND ND ND 51 9610 7/17/08 ND ND 860 ND ND 76 ND ND 210 ND ND ND 110 ND ND ND 140 19015 7/17/08 ND ND 460 ND ND 120 ND ND 66 ND ND ND 86 ND ND ND 190 15020 7/17/08 ND ND 2,900 ND ND 74 ND ND 55 ND ND ND 40 ND ND ND 120 11025 7/17/08 ND ND 180 ND ND 24 ND ND 23 ND ND ND 3.2 ND ND ND 52 4230 7/17/08 ND ND 110 ND ND 31 ND ND 6.3 ND ND ND 7.2 ND ND ND 53 39

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170



California Soils*

L20

L21

L22



Table 1A



Sampling Date


Sample ID

5 6/18/08 ND ND 800 ND ND 43 ND ND 31 ND ND ND 41 ND ND ND 88 6010 6/18/08 ND ND 510 ND ND 66 ND ND 41 ND ND ND 47 ND ND ND 120 9115 6/18/08 ND ND 860 ND ND 78 ND ND 42 ND ND ND 44 ND ND ND 120 9220 6/18/08 ND ND 160 ND ND ND ND ND ND ND ND ND ND ND ND ND 14 ND25 6/18/08 ND ND 170 ND ND 16 ND ND ND ND ND ND ND ND ND ND 35 1730 6/18/08 ND ND 70 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND

5 6/30/08 ND ND 1,600 ND ND 39 ND ND 35 ND ND ND 46 ND ND ND 100 9710 6/30/08 ND ND 370 ND ND ND ND ND ND ND ND ND ND ND ND ND 20 1515 6/30/08 ND ND 520 ND ND 75 ND ND 81 ND ND ND 65 ND ND ND 140 16020 6/30/08 ND ND 120 ND ND ND ND ND ND ND ND ND ND ND ND ND 7.5 225 6/30/08 ND ND 130 ND ND ND ND ND ND ND ND ND ND ND ND ND 32 1330 6/30/08 ND ND 53 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND

5 6/19/08 ND ND 1,100 ND ND 57 ND ND 35 ND ND ND 46 ND ND ND 120 6710 6/20/08 ND ND 1,400 ND ND 53 ND ND 33 ND ND ND 62 ND ND ND 110 7615 6/20/08 ND ND 460 ND ND 100 ND ND 62 ND ND ND 72 ND ND ND 170 13020 6/20/08 ND ND 340 ND ND 8.8 ND ND 12 ND ND ND ND ND ND ND 40 3025 6/20/08 ND ND 200 ND ND 13 ND ND ND ND ND ND ND ND ND ND 36 1130 6/20/08 ND ND 110 ND ND 8.2 ND ND ND ND ND ND ND ND ND ND 36 21

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170



California Soils*

L24

L25

L23



Table 1A



Sampling Date


Sample ID

5 6/18/08 ND ND 700 ND ND 51 ND ND 39 ND ND ND 48 ND ND ND 110 7410 6/18/08 ND ND 830 ND ND 68 ND ND 57 ND ND ND 64 ND ND ND 130 14015 6/18/08 ND ND 2,300 ND ND 79 ND ND 51 ND ND ND ND ND ND ND 130 9520 6/18/08 ND ND 61 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND25 6/18/08 ND ND 150 ND ND 5.9 ND ND ND ND ND ND ND ND ND ND 23 2030 6/18/08 ND ND 65 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND35 6/18/08 ND ND 72 ND ND ND ND ND ND ND ND ND ND ND ND ND 11 29

5 6/19/08 ND ND 1,100 ND ND 49 ND ND 36 ND ND ND 35 ND ND ND 92 6210 6/19/08 ND ND 660 ND ND 75 ND ND 49 ND ND ND 61 ND ND ND 130 10015 6/19/08 ND ND 520 ND ND 76 ND ND 41 ND ND ND 55 ND ND ND 130 9920 6/19/08 ND ND 99 ND ND ND ND ND ND ND ND ND ND ND ND ND 7.3 1225 6/19/08 ND ND 150 ND ND 25 ND ND ND ND ND ND ND ND ND ND 70 2130 6/19/08 ND ND 66 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND35 6/19/08 ND ND 120 ND ND ND ND ND ND ND ND ND ND ND ND ND 3.8 1150 6/19/08 ND ND 110 ND ND ND ND ND 5.8 ND ND ND ND ND ND ND 12 1760 6/19/08 ND ND 39 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND

5 6/19/08 ND ND 170 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND10 6/19/08 ND ND 840 ND ND 44 ND ND 38 ND ND ND 48 ND ND ND 95 7515 6/19/08 ND ND 350 ND ND 71 ND ND 40 ND ND ND 57 ND ND ND 130 9920 6/19/08 ND ND 190 ND ND ND ND ND 4.8 ND ND ND ND ND ND ND 40 2725 6/19/08 ND ND 180 ND ND 35 ND ND ND ND ND ND ND ND ND ND 85 3130 6/19/08 ND ND 56 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170



California Soils*

L30

L29

L28



Table 1A



Sampling Date


Sample ID

5 6/11/08 ND ND 510 ND ND 39 ND ND 37 ND ND ND 50 ND ND ND 79 7010 6/11/08 ND ND 740 ND ND 48 ND ND 31 ND ND ND 54 ND ND ND 82 7215 6/11/08 ND ND 330 ND ND 35 ND ND 32 ND ND ND 48 ND ND ND 99 7820 6/11/08 ND ND 910 ND ND 31 ND ND 8 ND ND ND 16 ND ND ND 48 3725 6/11/08 ND 9.2 ND ND 140 ND ND ND ND ND ND ND ND ND ND ND ND ND30 6/11/08 ND ND 50 ND ND ND ND ND ND ND ND ND 28 ND ND ND 41 3040 6/11/08 ND ND 60 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND50 6/11/08 ND ND 200 ND ND 20 ND ND 50 ND ND ND 2 ND ND ND 64 10060 6/11/08 ND ND 100 ND ND ND ND ND ND ND ND ND ND ND ND ND ND 1070 6/11/08 ND ND 36 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND80 6/11/08 ND ND 74 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND90 6/11/08 ND ND 82 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND

5 6/20/08 ND ND 300 ND ND 17 ND ND 18 ND ND ND ND ND ND ND 32 5410 6/20/08 ND ND 950 ND ND 97 ND ND 69 ND ND ND 92 ND ND ND 170 15015 6/20/08 ND ND 430 ND ND 95 ND ND 66 ND ND ND 97 ND ND ND 170 14020 6/20/08 ND ND 180 ND ND ND ND ND 15 ND ND ND ND ND ND ND 32 4625 6/20/08 ND ND 59 ND ND ND ND ND ND ND ND ND ND ND ND ND 25 2.730 6/20/08 ND ND 98 ND ND 2.7 ND ND ND ND ND ND ND ND ND ND 42 30

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170



California Soils*

L32

L33



Table 1A



Sampling Date


Sample ID

5 6/16/08 ND ND 1,300 ND ND 76 ND ND 53 ND ND ND 63 ND ND ND 150 9210 6/16/08 ND ND 740 ND ND 37 ND ND 28 ND ND ND 43 ND ND ND 72 6915 6/16/08 ND ND 450 ND ND 91 ND ND 57 ND ND ND 66 ND ND ND 140 11020 6/16/08 ND ND 400 ND ND 79 ND ND 46 ND ND ND 52 ND ND ND 100 12025 6/16/08 ND ND 420 ND ND 55 ND ND 33 ND ND ND 25 ND ND ND 91 10030 6/16/08 ND ND 85 ND ND 1.3 ND ND ND ND ND ND ND ND ND ND 32 47

5 6/30/08 ND ND 930 ND ND 64 ND ND 44 ND ND ND 48 ND ND ND 140 7410 6/30/08 ND ND 890 ND ND 87 ND ND 75 ND ND ND 53 ND ND ND 120 8915 6/30/08 ND ND 1,100 ND ND 76 ND ND 51 ND ND ND 58 ND ND ND 140 9920 6/30/08 ND ND 320 ND ND 35 ND ND 30 ND ND ND 51 ND ND ND 73 7525 6/30/08 ND ND 110 ND ND ND ND ND ND ND ND ND ND ND ND ND 44 1430 6/30/08 ND ND 62 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND

5 7/9/08 ND ND 1100 ND ND 110 ND ND 65 ND ND ND 83 ND ND ND 170 10010 7/9/08 ND ND 1100 ND ND 69 ND ND 43 ND ND ND 61 ND ND ND 120 8715 7/9/08 ND ND 420 ND ND 77 ND ND 44 ND ND ND 67 ND ND ND 140 9820 7/9/08 ND ND 300 ND ND 83 ND ND 49 ND ND ND 52 ND ND ND 150 12025 7/9/08 ND ND 72 ND ND ND ND ND ND ND ND ND ND ND ND ND 16 1630 7/9/08 ND ND 180 ND ND 18 ND ND ND ND ND ND ND ND ND ND 30 27

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170

L45

L34

L35



California Soils*



Table 1A



Sampling Date


Sample ID

5 7/9/08 ND ND 1700 ND ND 120 ND ND 69 ND ND ND 83 ND ND ND 200 12010 7/9/08 ND ND 980 ND ND 70 ND ND 44 ND ND ND 56 ND ND ND 130 9015 7/9/08 ND ND 420 ND ND 120 ND ND 64 ND ND ND 84 ND ND ND 180 14020 7/9/08 ND ND 78 ND ND ND ND ND 3.1 ND ND ND ND ND ND ND 36 9.225 7/9/08 ND ND 160 ND ND 33 ND ND 8.5 ND ND ND 3.9 ND ND ND 58 4930 7/9/08 ND ND 220 ND ND 23 ND ND ND ND ND ND ND ND ND ND 36 31

5 7/10/08 ND ND 960 ND 38 77 ND ND 53 ND ND ND 140 ND ND ND 150 15010 7/10/08 ND 140 81 ND 840 ND ND ND 260 ND ND ND 49 ND ND ND 95 6515 7/10/08 ND ND 500 ND ND 150 ND ND 77 ND ND ND 97 ND ND ND 230 17020 7/10/08 ND ND 83 ND ND ND ND ND ND ND ND ND ND ND ND ND 9.2 ND25 7/10/08 ND ND 120 ND ND 7.2 ND ND ND ND ND ND ND ND ND ND 38 1330 7/10/08 ND ND 92 ND ND 22 ND ND ND ND ND ND ND ND ND ND 53 31

5 7/10/08 ND ND 1,300 ND ND 90 ND ND 49 ND ND ND 66 ND ND ND 150 9110 7/10/08 ND ND 1,000 ND ND 100 ND ND 62 ND ND ND 97 ND ND ND 190 12015 7/10/08 ND ND 380 ND ND 110 ND ND 56 ND ND ND 73 ND ND ND 170 12020 7/10/08 ND ND 150 ND ND ND ND ND 2.9 ND ND ND ND ND ND ND 34 1325 7/10/08 ND ND 530 ND ND 17 ND ND ND ND ND ND ND ND ND ND 40 2530 7/10/08 ND ND 95 ND ND 6.6 ND ND ND ND ND ND ND ND ND ND 37 17

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170

L46

L47

L49


California Soils*




Table 1A



Sampling Date


Sample ID

5 6/26/08 ND ND 1,000 ND ND 75 ND ND 87 ND ND ND 92 ND ND ND 130 11010 6/26/08 ND ND 830 ND ND 59 ND ND 53 ND ND ND 63 ND ND ND 110 13015 6/26/08 ND ND 1,200 ND ND 92 ND ND 54 ND ND ND 66 ND ND ND 150 12020 6/26/08 ND ND 87 ND ND ND ND ND ND ND ND ND ND ND ND ND 8.1 ND25 6/26/08 ND ND 160 ND ND 14 ND ND ND ND ND ND ND ND ND ND 34 2530 6/26/08 ND ND 110 ND ND 5.5 ND ND ND ND ND ND ND ND ND ND 16 13

5 7/14/08 ND ND 1300 ND ND 77 ND ND 65 ND ND ND 68 ND ND ND 150 9810 7/14/08 ND ND 810 ND ND 69 ND ND 42 ND ND ND 69 ND ND ND 140 9015 7/14/08 ND ND 510 ND ND 67 ND ND 43 ND ND ND 47 ND ND ND 120 9720 7/14/08 ND ND 130 ND ND 25 ND ND ND ND ND ND ND ND ND ND 43 4125 7/14/08 ND ND 330 ND ND 20 ND ND ND ND ND ND ND ND ND ND 44 1730 7/14/08 ND ND 88 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND

5 6/26/08 ND ND 910 ND ND 63 ND ND 44 ND ND ND 61 ND ND ND 120 8110 6/26/08 ND ND 780 ND ND 72 ND ND 63 ND ND ND 71 ND ND ND 140 10015 6/27/08 ND ND 840 ND ND 86 ND ND 48 ND ND ND 68 ND ND ND 140 11020 6/27/08 ND ND 130 ND ND ND ND ND ND ND ND ND ND ND ND ND 5.3 ND25 6/27/08 ND ND 140 ND ND 8.3 ND ND ND ND ND ND ND ND ND ND 33 1830 6/27/08 ND ND 190 ND ND 15 ND ND 13 ND ND ND 4.4 ND ND ND 43 38

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170

L50

L51

L52



California Soils*



Table 1A



Sampling Date


Sample ID

5 7/11/08 ND ND 960 ND ND 80 ND ND 51 ND ND ND 68 ND ND ND 160 8710 7/11/08 ND ND 870 ND ND 68 ND ND 43 ND ND ND 65 ND ND ND 130 8415 7/11/08 ND ND 1,200 ND ND 130 ND ND 72 ND ND ND 90 ND ND ND 210 14020 7/11/08 ND ND 270 ND ND 48 ND ND 21 ND ND ND 57 ND ND ND 90 6925 7/11/08 ND ND 190 ND ND 12 ND ND ND ND ND ND ND ND ND ND 64 21

5 7/11/08 ND ND 1100 ND ND 100 ND ND 61 ND ND ND 76 ND ND ND 160 10010 7/11/08 ND ND 790 ND ND 87 ND ND 49 ND ND ND 57 ND ND ND 160 9615 7/11/08 ND ND 770 ND ND 83 ND ND 45 ND ND ND 62 ND ND ND 150 11020 7/11/08 ND ND 250 ND ND 69 ND ND 25 ND ND ND 50 ND ND ND 90 92

5 6/27/08 ND ND 960 ND ND 71 ND ND 52 ND ND ND 68 ND ND ND 130 9310 6/27/08 ND ND 820 ND ND 80 ND ND 48 ND ND ND 70 ND ND ND 140 10015 6/27/08 ND ND 500 ND ND 71 ND ND 40 ND ND ND 50 ND ND ND 120 8920 6/27/08 ND ND 140 ND ND 14 ND ND ND ND ND ND 4.1 ND ND ND 40 3225 6/27/08 ND ND 220 ND ND 19 ND ND 4.3 ND ND ND 2.6 ND ND ND 53 3728 6/27/08 ND ND 260 ND ND 38 ND ND ND ND ND ND ND ND ND ND 63 39

5 7/9/08 ND ND 950 ND ND 85 ND ND 50 ND ND ND 73 ND ND ND 150 8710 7/9/08 ND ND 1,200 ND ND 110 ND ND 70 ND ND ND 84 ND ND ND 170 13015 7/9/08 ND ND 550 ND ND 100 ND ND 59 ND ND ND 86 ND ND ND 170 12020 7/9/08 ND ND 150 ND ND 27 ND ND 2.2 ND ND ND ND ND ND ND 37 40

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170

L54

L55

L56

L57



California Soils*



Table 1A



Sampling Date


Sample ID

20 11/10/09 ND 5.1 350 0.66 3.4 61 ND 10 35 5.4 ND 4.7 54 ND 1.8 ND 120 7495 11/10/09 ND 2.3 68 ND ND 16 ND 2.5 3.7 ND ND ND 8.7 ND ND ND 20 21

20 11/20/09 ND ND 2.3 250 ND 7.5 23 3 21 3.8 ND 2.2 35 ND ND ND 34 4280 11/20/09 ND ND 2.3 76 ND 2.8 19 ND 7.1 2 0.39 ND 9.9 ND ND ND 22 20

20 11/11/09 ND 4.2 170 ND 0.69 29 ND 4.7 12 2.7 ND ND 29 ND 1.2 ND 53 3790 11/11/09 ND ND 63 ND ND 14 ND 3.9 4.1 ND ND ND 9.3 ND ND ND 20 23

15 11/23/09 ND 2.8 310 0.58 3.7 58 ND 9.3 35 5.5 ND 3.8 55 ND ND ND 95 8020 11/23/09 ND 2.2 62 ND 0.81 9.5 ND 3.7 9.8 2.4 0.02 ND 14 ND ND ND 26 2035 11/23/09 ND 4.2 58 ND ND 16 0.25 4.8 5.6 2.3 0.023 ND 13 ND ND ND 26 2850 11/23/09 ND ND 92 0.52 ND 22 ND 10 31 7.4 0.039 ND 20 ND ND ND 51 5455 11/23/09 ND 2 37 ND ND 8.4 ND 2.5 5.7 2.4 ND ND 6.3 ND ND ND 13 1860 11/23/09 ND 3.1 59 ND ND 12 ND 3.8 7.8 3.2 0.032 ND 9.1 ND ND ND 19 25

20 11/18/09 ND 3.8 130 ND 0.58 30 0.55 4.4 17 3.3 ND ND 23 ND ND ND 57 4390 11/20/09 ND ND 57 ND ND 13 ND 3.5 3.7 ND ND ND 7.9 ND ND ND 18 21

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170

MW-15

MW-13

MW-14

MW-16

MW-17



California Soils*



Table 1A



Sampling Date


Sample ID

15 11/13/09 ND 3.3 390 0.57 3.6 69 0.91 9.6 35 4.6 ND 4 54 ND ND ND 130 7950 11/13/09 ND 8.3 170 ND ND 26 ND 13 26 5.1 0.Q28 ND 22 ND ND ND 47 5765 11/13/09 ND ND 42 ND ND 10 ND 1.9 2.9 ND ND ND 5.6 ND ND ND 13 1295 11/16/09 ND 4.3 470 0.6 2.2 58 ND 9.5 33 6.6 ND 6.9 48 ND ND ND 77 73

20 11/17/09 ND 3.2 400 0.56 3.0 38 ND 10 29 5.2 ND 4.1 47 ND ND ND 61 5785 11/18/09 ND 3.8 60 ND ND 16 ND 3.3 8.6 ND 0.02 ND 8.4 ND ND ND 18 21

10 11/17/09 ND 4.1 450 0.66 2.5 60 ND 11 31 4.8 0.029 3.3 46 ND 1.1 ND 120 6220 11/17/09 ND ND 340 0.68 2.6 52 ND 9.1 32 5.3 ND 3 41 ND ND ND 89 7430 11/17/09 ND 2.7 47 ND ND 15 ND 3.7 4.2 ND ND ND 13 ND ND ND 29 1735 11/17/09 ND 3.8 64 ND ND 18 ND 4.2 5.2 2.3 ND ND 14 ND ND ND 33 2640 11/17/09 ND 5 84 ND ND 24 ND 6.6 7.5 2.3 0.022 ND 15 ND ND ND 35 3345 11/17/09 ND ND 120 0.57 ND 58 ND 5.5 21 3.9 0.064 ND 23 ND ND ND 72 6250 11/17/09 ND 15 130 0.62 ND 29 ND 11 31 6.4 0.098 ND 24 ND ND ND 60 6755 11/17/09 ND 9.7 31 ND ND 8.6 ND 2.3 4.9 ND ND ND 5.7 ND ND ND 15 1560 11/17/09 ND 9.9 96 ND ND 25 ND 3.8 6.4 ND ND ND II ND ND ND 34 2775 11/17/09 ND ND 32 ND ND 6.8 ND 2.2 5.3 ND ND ND 4.2 ND ND ND 8.3 7.180 11/17/09 ND ND 73 ND ND 16 ND 2.8 3.1 ND 0.025 ND 8.6 ND ND ND 15 1586 11/17/09 ND ND 98 ND ND 9.9 ND 2.2 2.4 ND 0.07 ND 6.1 ND ND ND 13 14

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170



California Soils*

MW-18

MW-19

SVE-13



Table 1A



Sampling Date


Sample ID

20 11/19/09 ND 2.8 420 0.52 4.3 42 ND 9.6 30 5.6 ND 4 51 ND ND ND 63 6585 11/19/09 ND ND 56 ND ND 9.9 ND 1.8 2.4 ND ND ND 6.7 ND ND ND 14 15

VP-1 20 5/11/11 ND 4.2 240 0.74 3.4 14 ND 69 38 7.3 0.059 4 58 ND ND 1.1 120 77

VP-6 65 5/11/11 42 3.2 34 0.057 1.1 5.2 0.55 16 ND 46 ND ND ND 25 0.47 ND ND ND

VP-9 50 5/13/11 ND 30 ND ND 2.6 0.046 ND 10 ND ND 4.8 6.6 1.6 ND 8.4 16 5.8 ND

VP-14 80 5/13/11 16 ND 1.6 12 0.022 6.4 44 ND ND ND 1.1 ND ND 14 ND 3.9 ND ND

5 5/27/11 1.2 3.6 500 0.67 1.1 51 ND 8.6 33 4 0.054 4.1 45 2.3 ND 1.4 94 5110 5/27/11 ND 4.3 320 0.53 0.45 36 0.19 5.6 21 3.9 0.081 2 27 1.1 ND ND 62 3920 5/27/11 0.95 3.6 570 0.7 1.9 53 ND 8 33 4.2 0.065 3.3 44 2.7 ND 2 120 6135 5/27/11 ND 4.3 150 0.3 ND 20 ND 2 5.8 2.1 0.2 0.98 9.8 ND ND ND 35 1845 5/27/11 ND 3.4 79 0.49 ND 30 ND 4.3 14 3.2 0.063 0.51 17 ND ND ND 42 3950 5/27/11 ND 5.5 120 0.75 ND 28 ND 10 35 6.1 0.17 ND 21 1.3 ND ND 62 5765 5/31/11 ND 1.9 24 ND ND 8 NA 2 2.1 1.4 0.067 ND 4.4 ND ND ND 12 1285 5/31/11 ND 2.7 140 ND 0.31 19 NA 3.4 4 0.7 0.033 ND 11 ND ND ND 20 23

VP-18 50 5/18/11 ND 3.7 45 0.23 ND 14 ND 3.2 10 2.4 0.05 0.27 8.6 ND ND ND 25 20

VP-21 15 6/7/11 ND 3.1 440 0.63 4.1 54 0.18 10 32 5.3 0.026 2.6 48 ND ND 1.5 87 60

VP-24 5 6/7/11 ND 3.7 510 0.67 3.2 60 ND 9.2 36 4.5 0.026 3.4 50 ND ND ND 100 64

B-25 10 6/7/11 ND 5.8 440 0.7 2.5 8 0.2 53 39 0.053 71 3 43 5.7 ND 1.7 ND 72

10 6/7/11 ND 3.6 410 0.54 3.3 9.2 ND 39 30 0.074 53 1.9 40 5.4 ND 1.2 ND 56

470 0.36 220,000 6,900 7.3 NA 6.3 350 47,000 320 4.5 5,800 64,000 5,800 1,500 12 1,000 350,000Lower

Quartile 0.33 1.4 375 0.92 0.15 45 NA 8.7 16.1 16 0.10 0.6 21 0.015 0.22 9.8 75 133

Median 0.47 2.7 519.5 1.265 0.275 69 NA 11.6 21.6 20.6 0.19 0.85 27 0.015 0.37 13.5 94 153Upper

Quartile 0.76 4.7 625 1.53 0.44 115 NA 18.3 36.6 26.7 0.34 1.4 56 0.050 0.53 19.5 134 170



California Soils*

B-26

SVE-14

VP-16



Table 1A



Sampling Date


Sample ID

75 7/31/14

25 4/20/15

Table 1B


TPH Concentrations in Soil

TPH (mg/Kg )

TPH-d (mg/Kg )

TPH-o (mg/Kg )

TPH-g (mg/Kg)Sample ID

Depth (ft bgs )

Sampling Date

70 7/31/14

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