TECHNICAL MEMORANDUM June 16, 2011

Transcription

1 TECHNICAL MEMORANDUM June 16, 2011 Tier 1 Remedial Investigation Results and Tier 2 Sampling Plan Former Salinas Manufactured Gas Plant To: Mr. Henry Chui, Department of Toxics Substances Control From: Terra Pacific Group on behalf of Pacific Gas and Electric Company Date: June 16, 2011 Terra Pacific Group (TPG), on behalf of Pacific Gas and Electric Company (PG&E), has prepared this Technical Memorandum to summarize the results of the Tier 1 Remedial Investigation (RI) conducted at the former Salinas manufactured gas plant (MGP) site in (Figure 1). This Technical Memorandum also presents the proposed Tier 2 sampling plan. A complete discussion of the nature and extent of impact will be included in the RI report to be prepared following the completion of all tiered phases of investigation. The Tier 1 soil sampling activities were conducted in January 2011 in accordance with the RI Workplan dated December 15, 2010 (TPG, 2010), which was approved by the Department of Toxic Substances Control (DTSC), and pursuant to the Voluntary Cleanup Agreement (VCA) (Docket No. HSA-VCA 09/10-105) established between PG&E and the DTSC. Detailed background information including the site s history, past and current usage, hydrogeology, and surrounding land use are presented in the RI Workplan (TPG, 2010). The following section presents a brief summary of the Tier 1 results. 1.0 SUMMARY OF TIER 1 SAMPLING ACTIVITIES Between January 11 and 19, 2011, a total of 45 soil borings were drilled to depths ranging from 1.5 to 35 feet below ground surface (bgs) using a hand auger and direct-push geoprobe drill rig. Five of the borings, designated by an A or B after the boring number (e.g., P-16A), were step-out borings drilled due to refusal before reaching the target depth at the original location. Two borings, P-39 and P-40, were added to the proposed scope of work to further define the extent of visibly impacted soil encountered in the southern part of the Chevron property. Of the 45 borings completed, 26 were drilled on the Chevron property (former Unocal bulk plant), 7 were drilled on the California Water Service Company (CWS) property, 3 were drilled on the PG&E property (regulator station), and 9 were drilled within the public right-of-way on Bridge Alley, Market Way, and Bridge Street. All planned borings were drilled within close proximity to the locations specified in the workplan. Minor adjustments were made to the proposed locations due to the presence of utilities or other subsurface obstructions. The final Tier 1 boring locations are shown on the site plan in Figure SUBSURFACE CONDITIONS Subsurface soils beneath the site consist of artificial fill overlying alluvial deposits primarily composed of clay with subordinate interbeds of silt and fine-grained sand. Fill materials vary in thickness and composition and are characterized by debris consisting of fragments of red brick, concrete, wood, and metal. With few exceptions, the fill was generally 3 to 6 feet deep. In boring Page 1 of 6

2 TECHNICAL MEMORANDUM Former Salinas Manufactured Gas Plant June 16, 2011 P-32B, drilled on the CWS property (Figure 2), well-graded sand with concrete and brick debris was encountered to a depth of 10 feet bgs. In boring P-17, poorly and well graded sands with concrete, brick, metal and wood debris was encountered to a depth of approximately 10.5 feet where a concrete obstruction was encountered. Concrete was encountered in boring P-16 at a depth of 8 feet. In boring P-40, an abundance of wood debris was observed between 4 and 5.5 feet bgs. A void space was encountered below the wood debris between 5.5 and 8 feet bgs below which native lean clay was observed. Groundwater, which is estimated to occur at a depth of approximately 40 feet, was not encountered in any of the borings drilled. 1.2 SUMMARY OF TIER 1 SOIL ANALYTICAL RESULTS Table 1 summarizes the soil samples collected and the corresponding analytical tests that were performed. As shown in Table 1, the majority of the samples were analyzed for total petroleum hydrocarbons (TPH), quantified in the gasoline (), diesel (TPHd), and motor oil ranges (TPHmo), polycyclic aromatic hydrocarbons (), benzene, toluene, ethylbenzene, and total xylenes (BTEX), and for arsenic and lead. Select samples collected from visibly impacted intervals were also tested for the full list of volatile organic compounds (VOCs), Title 22 metals, and total cyanide. The analytical results are summarized in Tables 2 through 6 and the sampling locations are shown on the site plan in Figure 2. The distribution of the select constituents analyzed is illustrated on the site plan in Plate 1. The select constituents listed include, TPHd, TPHmo, carcinogenic polycyclic aromatic hydrocarbons (C) expressed in benzo(a)pyrene [B(a)P] equivalent concentrations, benzene, naphthalene, arsenic and lead. 2.0 PROPOSED TIER 2 SOIL AND SOIL GAS SAMPLING PROGRAM The proposed Tier 2 investigation will focus on evaluating potential impacts from former MGP structures located on the Alvarez property. Additional sampling on the Chevron property to fill data gaps, and the installation of soil gas probes near key structures throughout the former MGP site will also be performed. In addition, borings will be drilled on Market Way and Bridge Alley to evaluate the lateral extent of impacts encountered in Tier 1. The following sections present an overview of the Tier 2 sampling program. The proposed sampling locations are shown in Figure 3 and Plate 1. The sampling rationale is presented in Tables 7 and 8. The sampling activities will be performed in accordance with the field procedures presented in the December 15, 2010 RI Workplan. 2.1 TIER 2 SOIL SAMPLING PROGRAM Tier 2 soil sampling will be conducted to investigate potential MGP-related impacts associated with former MGP features located on the Alvarez property including the underground oil tanks, lampblack separators, retorts, scrubbers, purifiers and gas holder. Additional soil sampling will also be conducted on properties previously investigated in Tier 1. To investigate these areas, a total of 31 soil borings will be drilled to depths ranging from 5 to 35 feet at the approximate locations shown in Figure 3 and Plate 1. The boring locations may be adjusted in the field based on the conditions encountered (e.g., underground obstructions, utilities, refusal, etc.). Soil samples will be collected Page 2 of 6

3 TECHNICAL MEMORANDUM Former Salinas Manufactured Gas Plant June 16, 2011 from the most visibly impacted zones, if present. The proposed sampling depths and rationale, which are based on known historical information and results of the Tier 1 investigation, are presented in Table 7. Of the 31 soil borings proposed, 12 will be completed as multi-depth soil gas wells as discussed in Section 2.2. At locations where soil containing MGP residue (e.g. lampblack) is observed, additional step-out borings may be drilled. The need for step-out borings will be determined by the field engineer or geologist. Factors determining the need for and location of a step-out boring include: 1) the distance to the next closest sampling location, 2) the anticipated size of the former feature being investigated, and 3) the nature of the impacted material encountered. The proposed sample depths may be adjusted or additional samples may be collected and analyzed based on the field conditions encountered. In addition, the target boring depths may be extended to achieve vertical delineation of observed impacts. 2.2 TIER 2 SOIL GAS SAMPLING A soil gas survey consisting of the installation of 25 multi-depth soil gas wells (each with two probes for a total of 50 soil gas sampling points) will be performed to evaluate the potential presence of vapor-phase organic compounds in subsurface soils. The soil gas wells will be placed throughout the site as shown in Figure 3 and Plate 1. The soil gas well locations were selected to target impacted areas on the Chevron, CWS, and PG&E properties based on the Tier 1 results and potential source areas on the Alvarez property. This includes 9 locations on the Chevron Property (SG-1 through SG-9), 11 locations on the Alvarez property (SG-10 to SG-12, SG-14 to SG-16; SG- 18 to SG-20; SG-22 and SG-23), 1 location on the PG&E regulator station (SG-21), and 2 locations on the CWS property (SG-24 and SG-25). Soil gas wells SG-13 and SG-17 will be installed on Bridge Alley and Bridge Street, respectively. SG-13 will be used to evaluate potential impacts associated with high B(a)P and naphthalene concentrations detected in boring P-23. SG-17 will be installed to evaluate impacts detected in boring P-26 and to evaluate soil gas conditions along the west side of the existing auto service building. The soil gas wells will be constructed and sampled according to the procedures outlined in the December 15, 2010 Remedial Investigation Workplan except that the target depth for the deep probes will be 15 feet rather than 10 feet. Table 8 presents a summary of the target soil gas probe depths and rationale associated with the proposed location of each soil gas well. 3.0 TENTATIVE IMPLEMENTATION SCHEDULE Pre-field activities (utility clearance, permitting, etc.) will be initiated within four weeks of receiving DTSC approval of this Technical Memorandum. Upon completion of the pre-field activities, the Tier 2 investigation will be performed and completed over a three-week period. The DTSC will receive at least 7 days advanced notice before initiating the Tier 2 field activities. Following the completion of the Tier 2 investigation, a second inter-tier memorandum will be prepared which includes the Tier 2 results and a recommended scope of work for Tier 3 if deemed Page 3 of 6

4 TECHNICAL MEMORANDUM Former Salinas Manufactured Gas Plant June 16, 2011 necessary. If Tier 3 investigation is not warranted, the RI Report will be prepared following receipt of all Tier 2 investigation results. 4.0 REFERENCES Terra Pacific Group, 2010, Remedial Investigation Workplan, Former Salinas Manufactured Gas Plant, 2 Bridge Street, : Project No. PGE , dated December 15, 2010, 30 p. Page 4 of 6

5 TECHNICAL MEMORANDUM Former Salinas Manufactured Gas Plant June 16, ACKNOWLEDGMENT AND SIGNATURE The Tier 1 Technical Memorandum presented herein was prepared by Terra Pacific Group Incorporated on behalf of Pacific Gas and Electric Company. All work was performed by or under the direct supervision of the undersigned professionals. Raul A. Briones, PG, Project Manager Max Reyhani, PE, Principal-in-Charge Page 5 of 6

6 TECHNICAL MEMORANDUM Former Salinas Manufactured Gas Plant June 16, 2011 LIST OF TABLES Table No. Title 1 Tier 1 Soil Summary 2 Summary of TPH and BTEX in Soil 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil 4 Summary of Arsenic, Lead, and Cyanide in Soil 5 Summary of Volatile Organic Compounds in Soil 6 Summary of Metals in Soil 7 Proposed Tier 2 Soil Sampling Program and Rationale 8 Proposed Soil Gas Sampling Program and Rationale LIST OF FIGURES Figure No. Title 1 Site Location Map 2 Tier 1 Sampling Locations 3 Proposed Tier 2 Sampling Locations LIST OF PLATES Plate No. Title 1 Summary of Select Constituents in Soil Page 6 of 6

7 TABLES

8 Table 1 Tier 1 Soil Summary Boring Number P-1 P-2 P-3 P-4 P-5 P-6 P-7 P-8 P-9 Number Date Depth (feet) (8260B) TPHd (8015) TPHmo (8015) BTEX (8260B) Analytical Test (EPA Method) (8270SIM) Lead (6010B) Arsenic (6010B) Total Cyanide (9010/9014) VOCs (8260B) P /11/ X X X X X X X - - X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X - - X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X P /11/ X X X X X X X - - X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X X - - P-8-2.5A 1/11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X Title 22 Metals (6010/7471) Page 1 of 7

9 Table 1 Tier 1 Soil Summary Boring Number P-10 P-11 P-12 P-13 P-14 P-15 P-16 Number Date Depth (feet) (8260B) TPHd (8015) TPHmo (8015) BTEX (8260B) Analytical Test (EPA Method) (8270SIM) Lead (6010B) Arsenic (6010B) Total Cyanide (9010/9014) VOCs (8260B) P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X X X X X X X P /11/ X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X - - X P /12/ X X X X X X X P /12/ X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X P /12/ X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /13/ X X X - X - - X X X Title 22 Metals (6010/7471) Page 2 of 7

10 Table 1 Tier 1 Soil Summary Boring Number P-16A P-17 P-18 P-19 P-20 P-21 Number Date Depth (feet) (8260B) TPHd (8015) TPHmo (8015) BTEX (8260B) Analytical Test (EPA Method) (8270SIM) Lead (6010B) Arsenic (6010B) Total Cyanide (9010/9014) VOCs (8260B) P-16A-1.0 1/12/ X X X X X X X P-16A-3.0 1/12/ X X X X X X X P-16A-5.0 1/12/ X X X X X X X P-16A-6.5 1/13/ X X X X X X X P-16A /13/ X X X X X P-16A /13/ X X X X X P /12/ X X X X X X X P /12/ X X X X X X X X - X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /12/ X X X X X X X P /13/ X X X X X X X P /13/ X X X X X X X P /13/ X X X X X X X P /13/ X X X X X X X P /13/ X X X X X X X P /13/ X X X X X X X P /13/ X X X X X X X P /13/ X X X X X X X P /13/ X X X X X X X P /13/ X X X X X X X P /13/ X X X X X X X P /13/ X X X X X - - Title 22 Metals (6010/7471) Page 3 of 7

11 Table 1 Tier 1 Soil Summary Boring Number P-22 P-23 P-24 P-25 P-26 Number Date Depth (feet) (8260B) TPHd (8015) TPHmo (8015) BTEX (8260B) Analytical Test (EPA Method) (8270SIM) Lead (6010B) Arsenic (6010B) Total Cyanide (9010/9014) VOCs (8260B) P /13/ X X X X X X X X - - P /13/ X X X X X X X P /13/ X X X X X X X P /13/ X X X X X X X P /13/ X X X X X X X P /13/ X X X X X - - P /13/ X X X X X X X X - X P /13/ X X X X X X X X - X P /13/ X X X X X X X P /13/ X X X X X X X P /13/ X X X X X P /13/ X X X X X P /18/ X X X X X X X P /18/ X X X X X X X P /18/ X X X X X X X P /18/ X X X X X P /18/ X X X X X P /18/ X X X X X P /18/ X X X X X X X P /18/ X X X X X X X P /18/ X X X X X X X P /18/ X X X X X P /18/ X X X X X P /18/ X X X X X P /19/ X X X X X X X P /19/ X X X X X X X P /19/ X X X X X X X P /19/ X X X X X P /19/ X X X X X P /19/ X X X X X Title 22 Metals (6010/7471) Page 4 of 7

12 Table 1 Tier 1 Soil Summary Boring Number P-27 P-28 P-29 P-30 P-31 Number Date Depth (feet) (8260B) TPHd (8015) TPHmo (8015) BTEX (8260B) Analytical Test (EPA Method) (8270SIM) Lead (6010B) Arsenic (6010B) Total Cyanide (9010/9014) VOCs (8260B) P /18/ X X X X X X X P /18/ X X X X X X X P /18/ X X X X X X X P /18/ X X X X X P /18/ X X X X X P /18/ X X X X X P /19/ X X X X X X X P /19/ X X X X X X X P /19/ X X X X X X X X - - P /19/ X X X X X P /19/ X X X X X P /19/ X X X X X P /19/ X X X X X P /19/ X X X X X P /18/ X X X X X X X X - - P /18/ X X X X X X X P /18/ X X X X X X X P /18/ X X X X X P /18/ X X X X X P /18/ X X X X X P /18/ X X X X X P /18/ X X X X X X X P /18/ X X X X X X X P /18/ X X X X X X X P /19/ X X X X X P /19/ X X X X X P /13/ X X X X X X X - - X P /13/ X X X X X X X P /13/ X X X X X X X P /14/ X X X X X Title 22 Metals (6010/7471) Page 5 of 7

13 Boring Number Number Date Depth (feet) (8260B) Table 1 Tier 1 Soil Summary TPHd (8015) TPHmo (8015) BTEX (8260B) Analytical Test (EPA Method) (8270SIM) Lead (6010B) Arsenic (6010B) Total Cyanide (9010/9014) P /13/ X X X X X X X P-32 P /13/ X X X X X X X P /13/ X X X X X X X P /14/ X X - X X X P-32A P-32A-3.0 1/17/ P-32B-6.0 1/17/ X X X X X X X P-32B P-32B-9.5 1/17/ X X X X X P-32B /17/ X X X X X P /13/ X X X X X X X P-33 P /13/ X X X X X X X P /13/ X X X X X X X P-34 P /13/ X X X X X X X - - X P-34A-1.0 1/13/ X X X X X X X P-34A P-34A-3.0 1/14/ X X X X X X X P-34A-5.0 1/14/ X X X X X X X P-35 P /14/ X X X X X X X X - X P-35A-0.5 1/18/ X X X X X X X P-35A-2.5 1/18/ X X X X X X X P-35A-4.0 1/18/ X X X X X X X P-35A P-35A-5.0 1/18/ X X X X X X X P-35A-6.0 1/18/ X X X X X X X P-35A /18/ X X X X X P-35A /18/ X X X X X P-35A /18/ X X X X X P /14/ X X X X X X X P /14/ X X X X X X X P-36 P /14/ X X X X X X X P /14/ X X - X P /14/ X X - X P /14/ X X - X VOCs (8260B) Title 22 Metals (6010/7471) Page 6 of 7

14 Boring Number P-37 P-38 P-39 P-40 Number Date Depth (feet) (8260B) Table 1 Tier 1 Soil Summary TPHd (8015) TPHmo (8015) BTEX (8260B) Analytical Test (EPA Method) (8270SIM) Lead (6010B) Arsenic (6010B) Total Cyanide (9010/9014) VOCs (8260B) P /14/ X X X X X X X P /14/ X X X X X X X P /14/ X X X X X X X P /14/ X X - X P /14/ X X - X P /14/ X X X X X X X P /14/ X X X X X X X P /14/ X X X X X X X P /18/ X X X X X X X P /18/ X X X X X P /18/ X X X X X P /17/ X X X X X X X X - - P /17/ X X X X X X X P /17/ X X X X X X X P /17/ X X X X X P /17/ X X X X X P /17/ P /17/ X X X X X P /17/ X X X X X X X X - - P /17/ X X X X X X X P /17/ X X X X X P /17/ X X X X X P /17/ X X X X X P /17/ X X X X X Notes: = Total petroleum hydrocarbons quantified as gasoline TPHd = Total petroleum hydrocarbons quantified as diesel TPHmo = Total petroleum hydrocarbons quantified as motor oil BTEX = Benzene, toluene, ethylbenzne, and xylenes = Polycyclic aromatic hydrocarbons VOCs = Volatile organic compounds Title 22 Metals (6010/7471) Page 7 of 7

15 Table 2 Summary of TPH and BTEX in Soil Total Petroleum Hydrocarbons Volatile Organic Compounds No. Depth TPH- TPH- TPH- Ethylbenzene Date Benzene Toluene o-xylene p/m-xylene Gasoline Diesel Motor Oil (feet) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) P /11/11 1 < < < < <0.002 P /11/11 3 <0.05 <5.0 <25 <0.001 <0.001 <0.001 <0.001 <0.002 P /11/11 5 <0.048 <5.0 < < < < < P /11/11 1 < <0.001 <0.001 <0.001 <0.002 P /11/11 3 <0.05 <5.0 <25 <0.001 <0.001 <0.001 <0.001 <0.002 P /11/11 5 <0.041 <5.0 < < < < < P /11/ < <0.001 <0.001 <0.001 <0.002 P /11/11 3 < < < < < <0.002 P /11/11 5 <0.048 <5.0 < < < < < P /11/ < < < < P /11/ < < < <0.002 P /11/11 5 <0.046 <5.0 <25 < < < < < P /11/ ,400 3, <0.001 <0.001 <0.002 P /11/ < , < < < P /11/11 3 < < < < < P /11/11 5 <0.046 <5.0 < < < < < P /11/11 1 < , < < < < P /11/11 3 < < < < < P /11/11 5 <0.05 <5.0 < < < < <0.002 P /11/ <0.001 <0.001 <0.001 <0.002 P /11/ < < < < P /11/11 5 <0.046 <5.0 < < < < < P /11/11 1 < < < < <0.002 P /11/ < , <0.001 <0.001 <0.001 < P-8-2.5A 01/11/ <50 110, ,000 <0.5 <0.5 <0.5 <0.5 <0.5 P /11/11 5 <0.048 <5.0 < < < < < P /11/11 1 < < < < < < P /11/11 3 <0.047 <5.0 < < < < < P /11/11 5 <0.047 <5.0 < < < < < P /11/ , <0.001 <0.001 <0.002 P /11/ < < < < P /11/11 3 <0.049 <5.0 < < < < <0.002 P /11/11 5 <0.054 <5.0 < < < < < P /12/11 1 < < < < < P /12/11 3 <0.06 <5.0 < < < < < P /12/11 5 <0.048 <5.0 < < < < < P /12/11 10 <0.5 <5.0 <25 <0.005 <0.005 <0.005 <0.005 <0.005 P /12/ ,100 6,600 2, < <0.54 <1.1 P /12/ < , < < < < P /12/ < < < < < P /12/ , < < < < P /12/ , < < < Page 1 of 5

16 No. Date Table 2 Summary of TPH and BTEX in Soil Total Petroleum Hydrocarbons Volatile Organic Compounds Depth TPH- TPH- TPH- Ethylbenzene Benzene Toluene o-xylene p/m-xylene Gasoline Diesel Motor Oil (feet) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) P /12/ <25 <0.005 <0.005 <0.005 <0.005 <0.005 P /12/ < < < < P /12/ < < < < P /12/11 5 < < < < <0.002 P /12/ , <0.001 <0.001 <0.001 <0.002 P /12/ < < < < P /12/ <0.001 <0.001 <0.001 <0.002 P /12/ < < P /12/ , <0.11 <0.11 <0.11 <0.22 P /12/ <0.001 <0.001 <0.002 P /12/11 3 < ,300 4, < < < < P /12/11 5 < ,400 4, < < < < P /12/ ,100 3, < < < < P /12/ <0.001 <0.001 <0.001 < P /12/ < < < < P /13/11 6 1,000 2,800 3, P-16A /12/ < < < < P-16A /12/ < < < < < P-16A /12/ <5.0 < < < < < P-16A /13/ < <0.053 <0.053 <0.053 <0.11 P-16A /13/ <0.5 <0.5 <0.5 <0.5 <0.5 P-16A /13/ <0.5 <5.0 <25 <0.005 <0.005 <0.005 <0.005 <0.005 P /12/ , P /12/ ,000 14, < < < < P /12/ <0.005 <0.005 <0.005 <0.005 P /12/ < <2.5 <2.5 P /12/ < < < < P /12/11 3 <0.05 <5.0 < <0.001 <0.001 <0.001 <0.002 P /12/11 5 < < < < < P /12/ < < < < P /12/11 3 < < < < < P /12/ < < < <0.002 P /13/ , < P /13/ <5.0 < < < < P /13/11 5 <0.047 <5.0 < < < < < P /13/ <0.072 <0.072 <0.072 <0.072 <0.14 P /13/11 30 <0.047 <5.0 <25 < < < < < P /13/ ,100 2, P /13/ < P /13/11 5 < , < < < P /13/ ,300 3,700 <0.058 <0.058 <0.058 <0.058 <0.12 P /13/ <1 <1 <1 <1 <1. Page 2 of 5

17 No. Date Table 2 Summary of TPH and BTEX in Soil Total Petroleum Hydrocarbons Volatile Organic Compounds Depth TPH- TPH- TPH- Ethylbenzene Benzene Toluene o-xylene p/m-xylene Gasoline Diesel Motor Oil (feet) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) P /13/ , < P /13/ <1 < P /13/ ,000 25, P /13/ < < P /13/ < < < < P /13/ < < P /13/ ,500 3, P /13/ ,800 25,000 11,000 < < P /13/ ,700 8, < P /13/ ,300 8,100 <0.066 <0.066 <0.066 <0.066 <0.13 P /13/ ,300 94,000 67, P /13/ ,200 4,700 3, P /13/ ,300 7,200 4, < P /13/ <2 < P /18/11 1 <0.048 <5.0 < < < < < P /18/11 3 <0.052 <5.0 < <0.001 <0.001 < P /18/11 5 <0.056 <5.0 < < < < P /18/ ,800 4,900 <0.11 <0.11 <0.11 <0.11 <0.22 P /18/ ,300 <0.052 <0.052 <0.052 <0.052 <0.1 P /18/ <0.05 <5.0 <25 <0.001 <0.001 <0.001 <0.001 <0.002 P /18/11 1 < <0.005 <0.005 <0.005 <0.005 <0.005 P /18/11 3 <0.048 <5.0 < < < < < P /18/11 5 <0.045 <5.0 < < < < P /18/ ,900 3,100 <0.048 <0.048 <0.048 <0.048 <0.097 P /18/ ,600 3,600 <0.051 <0.051 <0.051 <0.051 <0.1 P /18/11 29 <0.041 <5.0 <25 < < < < < P /19/ < < < < P /19/11 3 <0.052 <5.0 < <0.001 <0.001 < P /19/11 5 <0.04 <5.0 < < < < P /19/ ,800 2,300 <0.068 <0.068 <0.068 <0.068 <0.14 P /19/ < < <0.002 P /19/ <0.042 <5.0 < < < < < P /18/ < < < < <0.002 P /18/11 3 <0.047 <5.0 < < < < < P /18/11 5 <0.045 <5.0 < < < < < P /18/11 9 < ,800 6, < < < P /18/ <5.0 < < < <0.002 P /18/ <0.041 <5.0 < < < < < P /19/ < < < P /19/11 3 < < < < < P /19/ ,900 3, < < < < P /19/ ,900 7,900 <0.085 <0.085 <0.085 <0.085 <0.17. Page 3 of 5

18 No. Date Table 2 Summary of TPH and BTEX in Soil Total Petroleum Hydrocarbons Volatile Organic Compounds Depth TPH- TPH- TPH- Ethylbenzene Benzene Toluene o-xylene p/m-xylene Gasoline Diesel Motor Oil (feet) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) P /19/ ,100 5,300 <0.052 <0.052 <0.052 <0.052 <0.1 P /19/ ,700 6,600 <0.053 <0.053 <0.053 <0.053 <0.11 P /19/ ,300 1,700 <0.048 <0.048 <0.048 <0.048 <0.095 P /19/ ,900 4,900 <0.052 <0.052 <0.052 <0.052 <0.1 P /18/ < < < < P /18/11 3 <0.049 <5.0 < < < <0.002 P /18/11 5 <0.046 <5.0 < < < < P /18/ < < < P /18/ <5.0 < < < P /18/ <5.0 < < < < < P /18/ <5.0 < < < < < P /18/11 1 <0.044 <5.0 < < < < < P /18/11 3 <0.045 <5.0 < < < < P /18/11 5 <0.048 <5.0 < < < < P /19/11 10 <0.05 <5.0 < <0.001 <0.001 <0.001 <0.002 P /19/11 18 <0.054 <5.0 < < < < P /13/ , < < < P /13/ ,900 3, < < < P /13/11 5 <0.048 <5.0 < < < < P /14/ <0.5 <5.0 <25 <0.005 <0.005 <0.005 <0.005 <0.005 P /13/ < < < P /13/ < < <0.002 P /13/ < < < P /14/ ,200 5, P-32B /17/11 6 < < < < < P-32B /17/ ,800 5,000 < <0.001 <0.001 < P-32B /17/ <5.0 < < < P /13/ < < < P /13/11 3 < < < < < P /13/11 5 <0.045 <5.0 < < < < P /13/ , <0.001 <0.001 <0.002 P-34A /13/ < < < < P-34A /14/ <0.001 <0.001 <0.001 <0.001 <0.002 P-34A /14/11 5 <0.056 <5.0 <25 < < < < < P /14/11 1 < < < < < P-35A /18/ <0.001 < P-35A /18/ <0.046 <5.0 < < < < < P-35A /18/11 4 < < < < < P-35A /18/11 5 <0.042 <5.0 < < < < P-35A /18/ <0.052 < P-35A /18/ ,000 3,000 <0.051 <0.051 <0.051 <0.051 <0.1 P-35A /18/ < Page 4 of 5

19 No. Date Table 2 Summary of TPH and BTEX in Soil Total Petroleum Hydrocarbons Volatile Organic Compounds Depth TPH- TPH- TPH- Ethylbenzene Benzene Toluene o-xylene p/m-xylene Gasoline Diesel Motor Oil (feet) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) P-35A /18/ <5.0 < < < < P /14/ < < <0.002 P /14/11 3 < , < < < < P /14/11 5 <0.05 <5.0 < <0.001 <0.001 <0.002 P /14/ P /14/ <5.0 < P /14/ <5.0 < P /14/ < ,600 5, < < < < P /14/11 3 < ,000 4,400 < < < < < P /14/ < < < P /14/ P /14/ , P /14/ < < < P /14/11 3 <0.049 <5.0 <25 < < < < <0.002 P /14/11 5 <0.041 <5.0 < < < < < P /18/ ,000 3,000 <0.054 <0.054 <0.054 <0.054 <0.11 P /18/ ,700 1,700 <0.05 <0.05 <0.05 <0.05 <0.099 P /18/11 29 <0.054 <5.0 <25 < < < < < P /17/ P /17/ < < P /17/ <5.0 < < < < P /17/ <0.092 <0.092 <0.092 <0.092 <0.18 P /17/ <5.0 <25 <0.051 < P /17/11 34 <0.042 <5.0 <25 < < < < < P /17/ < < < <0.002 P /17/ <0.001 <0.001 < P /17/ < < < P /17/ <5.0 < P /17/ P /17/ ,600 6,600 4, Notes: "<#" = not detected at or above laboratory reporting limit (RL) "---" = Not analyzed. Page 5 of 5

20 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. P P P P P P P P P P P P Depth (ft bgs) Date d 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 Non-Carcinogenic Acenaphthene 0.11 < < < < < J < < J < Acenaphthylene 0.59 < < J < < < < Anthracene 0.52 < < < < < < < Benzo (g,h,i) Perylene J J J J < Fluoranthene J J J J < Fluorene 0.15 < < J < < < < < Phenanthrene 3.6 < J J J J J < Pyrene J J < Carcinogenic Benzo (a) Anthracene J J J J J < Benzo (a) Pyrene J J J J < Benzo (b) Fluoranthene J J J J < Benzo (k) Fluoranthene 4.1 < J J < J J < Chrysene 4.2 < J < J < Dibenz (a,h) Anthracene 0.83 < < J < < J < Indeno (1,2,3-c,d) Pyrene 4.7 < J J J J < Naphthalene 0.66 < < J J J J < BaP Equivalent Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 1 of 17

21 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P P P P P P P P P P P P /11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 < J < J < < < J < J < J < < J J J J < J < D J < J J < < < < J J Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 2 of 17

22 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P-8-2.5A P P P P P P P P P P P A /11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/11/11 1/12/11 1/12/11 1/12/11 <0.13 < <0.025 < < J J < < J < < <0.060 < J < < < < < <0.15 < J < < < < < < J J 0.67 < J J J J J J 0.16 J < J < < < < J < < < J J J 0.20 < J J J J J < J J J J J 0.70 < J J J J J 0.44 J < J J J J J 0.28 J < < J J 1.2 < J 2.7 < J J J 1 < J <0.067 < < < < < J 0.38 J < J J J 0.65 < J 0.11 J < < < J J < J Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 3 of 17

23 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P P P P P P P P P P P P /12/11 1/12/11 1/12/11 1/12/11 1/12/11 1/12/11 1/12/11 1/12/11 1/12/11 1/12/11 1/12/11 1/12/11 < < J < J < J < < < J J < < J J < < < J < J J J J D J 0.22 < J < J < < < J J < J J J J J J J 0.42 < J J 0.44 < J 0.29 < < J J J < J J J J J Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 4 of 17

24 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P P P P P P P P P P P-16A-1.0 P-16A /12/11 1/12/11 1/12/11 1/12/11 1/12/11 1/12/11 1/12/11 1/12/11 1/12/11 1/13/11 1/12/11 1/12/11 < J 0.23 J 0.13 J J J J < < < J J < J J J < J J J < J < J J J < J J J < < J J < Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 5 of 17

25 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P-16A-5.0 P-16A-6.5 P-16A-20.0 P-16A-34.5 P P P P P P P P /12/11 1/13/11 1/13/11 1/13/11 1/12/11 1/12/11 1/12/11 1/12/11 1/12/11 1/12/11 1/12/11 1/12/ J < < < < < J < < J J J J J 0.55 < < < < J J < J J 0.69 < < J J < < < J < < J J < J J J < J 0.88 < < J J J 1.5 D < < J 0.75 < < J 0.78 < < J J 0.87 < < J < < < J J J J J 0.54 < < < J J J Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 6 of 17

26 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P P P P P P P P P P P P /12/11 1/12/11 1/13/11 1/13/11 1/13/11 1/13/11 1/13/11 1/13/11 1/13/11 1/13/11 1/13/11 1/13/ J J 0.19 J < < < < J 0.13 J < J J J < < J < < J < J J < J < < J < J J J J J < < J < < < J 0.19 < < < < J < < J J < < J J J Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 7 of 17

27 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P P P P P P P P P P P P /13/11 1/13/11 1/13/11 1/13/11 1/13/11 1/13/11 1/13/11 1/13/11 1/13/11 1/13/11 1/13/11 1/13/ J < J D J J J D J J J J ,000 1, Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 8 of 17

28 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P P P P P P P P P P P P /13/11 1/13/11 1/18/11 1/18/11 1/18/11 1/18/11 1/18/11 1/18/11 1/18/11 1/18/11 1/18/11 1/18/ < < < J < < < < < < < < < < < J J < < < < < J < < J J < < J < < J J J < J J 0.20 < J < < < < < < < < < < J < < < < < < J < J < < J 0.25 < J J < < J J 0.29 < J J < < J J 0.55 < J J < < J J 0.38 < J < < < < < < J J < < < < < J J 0.23 J < < < J < < < < < J J < < J < < < J J < < < J < J < < J Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 9 of 17

29 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P P P P P P P P P P P P /18/11 1/18/11 1/19/11 1/19/11 1/19/11 1/19/11 1/19/11 1/19/11 1/18/11 1/18/11 1/18/11 1/18/ < < < < < < < < J < < < < < < < < < J J < < < < < < < J < < J J < < < < < < J < < < J < < < < J J < < < < < J D < < < < J < < < < J < < < < < J < < < < < < < < < < < J < < < < J J < < < < < < Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 10 of 17

30 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P P P P P P P P P P P P /18/11 1/18/11 1/19/11 1/19/11 1/19/11 1/19/11 1/19/11 1/19/11 1/19/11 1/19/11 1/18/11 1/18/11 < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < J J 1.9 < J < < < < J J J < < < < < < J < < J J J < < < < < J J < < < < J < < < < < J < J < < < < < J J J < < < < < J J J < < < < < < < < < < < < < J J J < < < < < < < < < < < < < < J J 1.7 < J J J 0.14 < < < < J Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 11 of 17

31 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P P P P P P P P P P P P /18/11 1/18/11 1/18/11 1/18/11 1/18/11 1/18/11 1/18/11 1/18/11 1/19/11 1/19/11 1/13/11 1/13/11 < J < < < J < < < < J < J < < < J J < < < J < < < < < < < < J < J < J J J J < J < J J J < J < < < < < < < J < J < J J < < J < D J J J J < J < J J J J J < J < J J J < J < J < J J J < J < J < J J < < J < J < J J < < < < J < J J < < < J < J < J J J < J J < < J < Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 12 of 17

32 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P P P P P P P-32B-6.0 P-32B-9.5 P-32B-19.0 P P P /13/11 1/14/11 1/13/11 1/13/11 1/13/11 1/14/11 1/17/11 1/17/11 1/17/11 1/13/11 1/13/11 1/13/11 < < < < J 0.36 J < <0.050 < <0.050 < < J < < J < J J < < < < < < J < J 0.14 < J J J J < < < J J 0.29 < J < < J J J J 0.17 < J J J < J < J < J < J < J < J < < < J < < < J J < < J < < < < J < J J < < J J Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 13 of 17

33 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P P-34A-1.0 P-34A-3.0 P-34A-5.0 P P-35A-0.5 P-35A-4.0 P-35A-5.0 P-35A-6.0 P-35A-16.0 P-35A-2.5 P-35A /13/11 1/13/11 1/14/11 1/14/11 1/14/11 1/18/11 1/18/11 1/18/11 1/18/11 1/18/11 1/18/11 1/18/ J < < J < J < < J J J J J < < J J J J < J J J J J < < J J < < J J Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 14 of 17

34 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P-35A-29.5 P P P P P P P P P P P /18/11 1/14/11 1/14/11 1/14/11 1/14/11 1/14/11 1/14/11 1/14/11 1/14/11 1/14/11 1/14/11 1/14/ J J < J <0.25 < < J J < < < < < J 0.55 < < < J J J 120D < J < J J < < J J < J 3.3 < J < J 0.83 < J < J 1 < J < J 0.57 < < < < < < < J 0.97 < < < < < < J < J 0.44 < < J Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 15 of 17

35 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P P P P P P P P P P P P /14/11 1/14/11 1/14/11 1/18/11 1/18/11 1/18/11 1/17/11 1/17/11 1/17/11 1/17/11 1/17/11 1/17/ < < < J J < J < J < < < J < < J < < < < < < < J J < < < J J J < J < < < < < < < J < J < J < < J 0.10 < < J < J J < < J < J < < J < J < < J < J J < < J < J < < J < < < J < < J < J J < < J < J J J < Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 16 of 17

36 Table 3 Summary of Polycyclic Aromatic Hydrocarbons in Soil No. Depth (ft bgs) Date d Non-Carcinogenic Acenaphthene Acenaphthylene Anthracene Benzo (g,h,i) Perylene Fluoranthene Fluorene Phenanthrene Pyrene Carcinogenic Benzo (a) Anthracene Benzo (a) Pyrene Benzo (b) Fluoranthene Benzo (k) Fluoranthene Chrysene Dibenz (a,h) Anthracene Indeno (1,2,3-c,d) Pyrene Naphthalene BaP Equivalent 1 P P P P P P /17/11 1/17/11 1/17/11 1/17/11 1/17/11 1/17/ J J J Notes: All analytical results presented in milligrams per kilogram. "<#" = not detected at or above laboratory detection limit ft bgs = feet below ground surface BaP Equivalent = Calculated Benzo(a)pyrene Equivalent 1 Benzo(a)pyrene equivalents represent the sum of the concentration of each carcinogenic PAH multiplied by its toxicity equivalence factor (except for naphthalene). J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limit. D = The sample was diluted to bring the analyte concentration within calibration range.. Page 17 of 17

37 Table 4 Summary of Arsenic, Lead and Cyanide in Soil ID Date Depth (feet bgs) Arsenic (mg/kg) Lead (mg/kg) Total Cyanide (mg/kg) P /11/ , P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ <0.50 BU P-8-2.5A 01/11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /11/ P /12/ P /12/ P /12/ P /12/ P /12/ P /12/ P /12/ P /12/ P /12/ Page 1 of 4

38 Table 4 Summary of Arsenic, Lead and Cyanide in Soil ID Date Depth (feet bgs) Arsenic (mg/kg) Lead (mg/kg) Total Cyanide (mg/kg) P /12/ P /12/ P /12/ P /12/ P /12/ P /12/ P /12/ P /12/ P-16A /12/ P /12/ P /12/ P-16A /12/ P /12/ P-16A /12/ P /13/ P-16A /13/ P /12/ P /12/ <0.50 P /12/ , P /12/ P /12/ P /12/ P /12/ P /12/ P /12/ P /12/ P /13/ P /13/ P /13/ P /13/ P /13/ P /13/ P /13/ P /13/ P /13/ P /13/ P /13/ P /13/ P /13/ P /13/ P /13/ P /13/ P /13/ , P /13/ , P /13/ Page 2 of 4

39 Table 4 Summary of Arsenic, Lead and Cyanide in Soil ID Date Depth (feet bgs) Arsenic (mg/kg) Lead (mg/kg) Total Cyanide (mg/kg) P /13/ P /18/ P /18/ P /18/ P /18/ P /18/ P /18/ P /19/ P /19/ P /19/ P /18/ P /18/ P /18/ P /19/ P /19/ P /19/ <0.50 P /18/ P /18/ P /18/ P /18/ P /18/ P /18/ P /13/ P /13/ P /13/ P /13/ P /13/ P /13/ P /14/ P-32B /17/ P /13/ P /13/ P /13/ P /13/ P-34A /13/ P-34A /14/ P-34A /14/ P-35A /18/ P /14/ <0.50 P-35A /18/ P-35A /18/ P-35A /18/ P-35A /18/ P /14/ P /14/ Page 3 of 4

40 Table 4 Summary of Arsenic, Lead and Cyanide in Soil ID Date Depth (feet bgs) Arsenic (mg/kg) Lead (mg/kg) Total Cyanide (mg/kg) Notes: P /14/ P /14/ P /14/ P /14/ P /14/ P /14/ P /14/ P /18/ P /17/ P /17/ P /17/ P /17/ P /17/ All analytical results presented in milligrams per kilogram (mg/kg) "<#" = not detected at or above laboratory reporting limit (RL) feet bgs = feet below ground surface "---" = Not analyzed. Page 4 of 4

41 Table 5 Summary of Volatile Organic Compounds in Soil No. P P Date 01/13/11 01/12/11 Depth (feet) Units mg/kg mg/kg 1,1,1,2-Tetrachloroethane <1 <2.5 1,1,1-Trichloroethane <1 <2.5 1,1,2,2-Tetrachloroethane <1 <2.5 1,1,2-Trichloro-1,2,2-Trifluoroethane <10 <25 1,1,2-Trichloroethane <1 <2.5 1,1-Dichloroethane <1 <2.5 1,1-Dichloroethene <1 <2.5 1,1-Dichloropropene <1 <2.5 1,2,3-Trichlorobenzene <2 <5 1,2,3-Trichloropropane <1 <2.5 1,2,4-Trichlorobenzene <1 <2.5 1,2,4-Trimethylbenzene <1 <2.5 1,2-Dibromo-3-Chloropropane <5 <12 1,2-Dibromoethane <1 <2.5 1,2-Dichlorobenzene <1 <2.5 1,2-Dichloroethane <1 <2.5 1,2-Dichloropropane <1 <2.5 1,3,5-Trimethylbenzene <1 <2.5 1,3-Dichlorobenzene <1 <2.5 1,3-Dichloropropane <1 <2.5 1,4-Dichlorobenzene <1 <2.5 2,2-Dichloropropane <1 <2.5 2-Butanone <10 <25 2-Chlorotoluene <1 <2.5 2-Hexanone <10 <25 4-Chlorotoluene <1 <2.5 4-Methyl-2-Pentanone <10 <25 Acetone <25 <62 Benzene Bromobenzene <1 <2.5 Bromochloromethane <1 <2.5 Bromodichloromethane <1 <2.5 Bromoform <1 <2.5 Bromomethane <5 <12 c-1,2-dichloroethene <1 <2.5 c-1,3-dichloropropene <1 <2.5 Carbon Disulfide <10 <25 Carbon Tetrachloride <1 <2.5 Chlorobenzene <1 <2.5 Chloroethane <1 <2.5 Chloroform <1 <2.5 Chloromethane <5 <12 Dibromochloromethane <1 <2.5 Dibromomethane <1 <2.5. Page 1 of 2

42 Notes: Table 5 Summary of Volatile Organic Compounds in Soil No. P P Date 01/13/11 01/12/11 Depth (feet) Units mg/kg mg/kg Dichlorodifluoromethane <1 <2.5 Diisopropyl Ether (DIPE) <2 <5 Ethanol <100 <250 Ethylbenzene Ethyl-t-Butyl Ether (ETBE) <2 <5 Isopropylbenzene <1 <2.5 Methylene Chloride <10 <25 Methyl-t-Butyl Ether (MTBE) <1 <2.5 Naphthalene 480 J 290 n-butylbenzene <1 <2.5 n-propylbenzene <1 <2.5 o-xylene 1.5 <2.5 p/m-xylene 4.5 <2.5 p-isopropyltoluene <1 <2.5 sec-butylbenzene <1 <2.5 Styrene <1 <2.5 t-1,2-dichloroethene <1 <2.5 t-1,3-dichloropropene <1 <2.5 Tert-Amyl-Methyl Ether (TAME) <2 <5 Tert-Butyl Alcohol (TBA) <10 <25 tert-butylbenzene <1 <2.5 Tetrachloroethene <1 <2.5 Toluene 3.4 <2.5 Trichloroethene <1 <2.5 Trichlorofluoromethane <10 <25 Vinyl Acetate <10 <25 Vinyl Chloride <1 <2.5 "<#" = not detected at or above laboratory reporting limit (RL) J = Estimated value; analyte detected at a level less than the reporting limit and greater than or equal to the method detection limi. Page 2 of 2

43 ID Date Depth (feet) Sb Ba Be Cd Cr Co Cu Hg Mo Ni Se Ag Th V Zn (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) P /13/11 6 < <0.750 <0.250 < P /12/11 3 < < < <0.750 <0.250 < P /12/ < < <0.750 <0.250 < Notes: "<#" = not detected at or above laboratory reporting limit (RL) See Table 4 for arsenic and lead results. Sb = Antimony Co = Cobalt Se = Selenium Ba = Barium Cu = Copper Ag = Silver Be = Berylium Hg = Mercury Th = Thallium Cd = Cadmium Mo = Molybdenum V = Vanadium Cr = Chromium Ni = Nickel Zn = Zinc Table 6 Summary of Metals in Soil. Page 1 of 1

44 Boring ID Target P-41 5 P P-43 5 Target Table 7 Proposed Tier 2 Soil Sampling Program and Rationale Analyses 1 As, Pb, Sampling Rationale Assess western extent of arsenic and lead detected in shallow soil (0-6-ft interval) in boring P-1. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. 3 As, Pb, 5 Hold If impacted soil observed, adjust sampling depth to collect most impacted soil. Drill deeper if necessary to collect a sample without visual impacts and assess analytical program. Assess eastern extent of impact detected in shallow soil (0-6-ft interval) in boring P-5. If impacted soil 1 observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range Hold Hold If impacted soil observed, adjust sampling depth to collect most impacted soil. Drill deeper if necessary to collect a sample without visual impacts and assess analytical program. Assess eastern extent of impact detected in shallow soil (0-6-ft interval) in boring P-8. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Drill deeper if necessary to collect a sample without visual impacts and assess analytical program. Page 1 of 12

45 Boring ID Target P P P-46 5 Target Table 7 Proposed Tier 2 Soil Sampling Program and Rationale Analyses TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, 5 Hold Sampling Rationale Assess eastern extent of impact detected in shallow soil (0-6-ft interval) in boring P-12. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Drill deeper if necessary to collect a sample without visual impacts and assess analytical program. Assess eastern extent of impact observed in boring P-22. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Analyze and adjust sampling depth to target the most impacted soil observed within the 15- to 35-ft depth range. Assess analytical program and drill deeper as appropriate. Assess western extent of impact observed in boring P-20. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Drill deeper if necessary to collect a sample without visual impacts and assess analytical program. Page 2 of 12

46 Boring ID Target P P Target Table 7 Proposed Tier 2 Soil Sampling Program and Rationale Analyses TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, Sampling Rationale Assess potential impacts associated with former gas holder and lampblack separator and evaluate extent of impact detected in 10- to 20-ft depth range in boring P-24. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Analyze and adjust sampling depth to target the most impacted soil observed within the 15- to 25-ft depth range. Assess analytical program and drill deeper as appropriate. Assess potential impacts associated with former lampblack tracks and evaluate the southern extent of impact detected in borings P-20 and P-21. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 15- to 35-ft depth range. Page 3 of 12

47 Boring ID Target P P P Target Table 7 Proposed Tier 2 Soil Sampling Program and Rationale Analyses 10 Hold TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, Sampling Rationale Assess potential impacts associated with the generator and scrubbers in Building If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Analyze and adjust sampling depth if impact observed. Assess analytical program and drill deeper as appropriate. Assess potential impacts in area between scrubbers and underground oil tanks. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 20-ft depth range. Assess analytical program and drill deeper as appropriate. Assess potential impacts associated with the former underground oil tank. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 25-ft depth range. Assess analytical program and drill deeper as appropriate. Page 4 of 12

48 Boring ID Target P P P Target Table 7 Proposed Tier 2 Soil Sampling Program and Rationale Analyses TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, Sampling Rationale Assess potential impacts associated with former MGP building If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 20-ft depth range. Assess analytical program and drill deeper as appropriate. Assess eastern extent of impact detected in borings P-35A and P-38. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 30-ft depth range. Assess analytical program and drill deeper as appropriate. Assess northern extent of impact detected in boring P-28 and evaluate potential impacts in the vicinity of former MGP building If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 35-ft depth range. Assess analytical program and drill deeper as appropriate. Page 5 of 12

49 Boring ID Target P-55 5 P P Target Table 7 Proposed Tier 2 Soil Sampling Program and Rationale Analyses TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, Sampling Rationale Assess eastern extent of impact in shallow soils (0-3 ft bgs) detected in borings P-34 and P-34A. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Assess analytical program and drill deeper as appropriate. Assess southwestern extent of impact detected in boring P-27 and west of boring P-28 (underground fuel oil tank). If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 25-ft depth range. Assess analytical program and drill deeper as appropriate. Assess southern extent of impact detected in boring P-28 (underground fuel oil tank). If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 35-ft depth range. Assess analytical program and drill deeper as appropriate. Page 6 of 12

50 Boring ID Target P-58 5 P-59 5 SG-5 15 Target Table 7 Proposed Tier 2 Soil Sampling Program and Rationale Analyses TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, Sampling Rationale Assess eastern extent of impact detected in shallow soil (0- to 3-ft interval) in boring P-33. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Assess analytical program and drill deeper as appropriate. Assess eastern extent of impact detected in shallow soil (0- to 3-ft interval) in boring P-31. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. Assess analytical program and drill deeper as appropriate. Assess vertical extent of TPH and PAH impact detected in boring P-15. If impacted soil observed, adjust sampling depth to target most impacted soil. The boring will be completed as a nested soil gas probe. See Table 8 for soil gas sampling program. Assess analytical program and drill deeper as appropriate. Page 7 of 12

51 Boring ID Target SG SG Target Table 7 Proposed Tier 2 Soil Sampling Program and Rationale Analyses TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, Sampling Rationale Assess potential impacts associated with former gas holder and lampblack separator and evaluate extent of impact detected in borings P-20 and P-24. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. The boring will be completed as a nested soil gas probe. See Table 8 for soil gas sampling program. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 25-ft depth range. Assess analytical program and drill deeper as appropriate. Assess potential impacts associated with former lampblack track and turntable and to evaluate extent of impact detected in boring P-21. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. The boring will be completed as a nested soil gas probe. See Table 8 for soil gas sampling program. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 35-ft depth range. Assess analytical program and drill deeper as appropriate. Page 8 of 12

52 Boring ID Target SG SG SG Target Table 7 Proposed Tier 2 Soil Sampling Program and Rationale Analyses TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, Sampling Rationale Assess potential impacts associated with former scrubbers and wash box and to evaluate extent of impact detected in boring P-23. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. The boring will be completed as a nested soil gas probe. See Table 8 for soil gas sampling program. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 35-ft depth range. Assess analytical program and drill deeper as appropriate. Assess eastern extent of impact detected in boring P-23. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. The boring will be completed as a nested soil gas probe. See Table 8 for soil gas sampling program. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 35-ft depth range. Assess analytical program and drill deeper as appropriate. Assess lateral extent of impact detected in boring P-25. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. The boring will be completed as a nested soil gas probe. See Table 8 for soil gas sampling program. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 25-ft depth range. Assess analytical program and drill deeper as appropriate. Page 9 of 12

53 Boring ID Target SG SG SG Target Table 7 Proposed Tier 2 Soil Sampling Program and Rationale Analyses TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, Sampling Rationale Assess potential impacts associated with the former underground oil tank. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. The boring will be completed as a nested soil gas probe. See Table 8 for soil gas sampling program. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 25-ft depth range. Assess analytical program and drill deeper as appropriate. Assess potential impacts associated with the former gas retorts. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. The boring will be completed as a nested soil gas probe. See Table 8 for soil gas sampling program. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 25-ft depth range. Assess analytical program and drill deeper as appropriate. Assess potential impacts associated with structures in former Building If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. The boring will be completed as a nested soil gas probe. See Table 8 for soil gas sampling program. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 15-ft depth range. Assess analytical program and drill deeper as appropriate. Page 10 of 12

54 Boring ID Target SG SG Target Table 7 Proposed Tier 2 Soil Sampling Program and Rationale Analyses TPPH, TEPH, BTEX, TPPH, TEPH, BTEX, Sampling Rationale Assess potential impacts associated with the former gas retorts and impacts detected in boring P-36. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. The boring will be completed as a nested soil gas probe. See Table 8 for soil gas sampling program. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 25-ft depth range. Assess analytical program and drill deeper as appropriate. Assess potential impacts associated with the former lampblack track and turntable inside Building 2782 and assess lateral extent of impacts detected in borings P-35A and P-38. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. The boring will be completed as a nested soil gas probe. See Table 8 for soil gas sampling program. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 25-ft depth range. Assess analytical program and drill deeper as appropriate. Page 11 of 12

55 Boring ID Target SG Target Table 7 Proposed Tier 2 Soil Sampling Program and Rationale Analyses TPPH, TEPH, BTEX, Sampling Rationale Assess potential impacts next to existing building and former Building 2781 and assess lateral extent of impacts detected in boring P-27. If impacted soil observed, adjust sampling depth to target most impacted soil in upper 1- to 2-ft depth range. The boring will be completed as a nested soil gas probe. See Table 8 for soil gas sampling program. Analyze and adjust sampling depth if impact observed and target the most impacted soil within the 10- to 25-ft depth range. Assess analytical program and drill deeper as appropriate. Notes: As = Arsenic using EPA Method 6010B Pb = Lead using EPA Method 6010B TPPH = total purgeable petroleum hydrocarbons using EPA Method 8260B/5035 TEPH = total extractable petroleum hydrocarbons using EPA Method 8015 BTEX = benzene, toluene, ethylbenzene, and total xylenes using EPA Method 8260B/5035 = polycyclic aromatic hydrocarbons using EPA Method 8270C SIM Select soil samples will be analyzed for cyanide using EPA Method 335.2/9010, VOCs using EPA Method 8260B/5035, and metals using EPA Method 6010B/7471A. Page 12 of 12

56 Soil Gas Probe ID Target Target Soil Gas Probe SG SG SG SG SG Table 8 Proposed Soil Gas Sampling Program and Rationale Analyses Sampling Rationale Assess soil gas in the vicinity of impacts detected in P-1 and P-2. Assess soil gas in the area of the former northern steel gas holder. Assess soil gas in the area of the former northern steel gas holder. Assess soil gas in the area of the former northern steel gas holder. Assess soil gas associated with impact detected in boring P-15. Soil samples will be collected and analyzed to define the vertical extent of impact in P-15. See Table 7 for soil sampling program and rationale. Page 1 of 5

57 Soil Gas Probe ID Target Target Soil Gas Probe SG SG SG SG SG Table 8 Proposed Soil Gas Sampling Program and Rationale Analyses Sampling Rationale Assess soil gas associated with impacts detected in borings P-14 and P-17 in the area of the former gas holder. Assess soil gas associated with impacts detected in borings P-16 and P-17 within the area of the former gas holder. Adjust depth or eliminate 15-foot probe if concrete obstructions or liquids encountered as observed in P- 16 and P-17. Assess soil gas associated with impacts detected in boring P-40 and the area adjacent to the former steel purifiers. Assess soil gas associated with impacts detected in borings P-22 and P-23 located in the area of the former steel purifiers. Assess soil gas associated with impacts detected in boring P-20 and potential impacts associated with the former lampblack separator and gas holder. Soil samples will be collected from this boring to evaluate potential impacts to soil. See Table 7 for soil sampling program and rationale. Page 2 of 5

58 Soil Gas Probe ID Target Target Soil Gas Probe SG SG SG SG SG Table 8 Proposed Soil Gas Sampling Program and Rationale Analyses Sampling Rationale Assess soil gas associated with impacts detected in boring P-21 and potential impacts associated with the former lampblack track and turntable. Soil samples will be collected from this boring to evaluate potential impacts to soil. See Table 7 for soil sampling program and rationale. Assess soil gas associated with impacts detected in boring P-23 and potential impacts associated with the former scrubbers. Soil samples will be collected from this boring to evaluate potential impacts to soil. See Table 7 for soil sampling program and rationale. Assess soil gas in Bridge Alley east of impact observed in boring P-23. Soil samples will be collected from this boring to evaluate the eastern extent of impact. See Table 7 for soil sampling program and rationale. Assess soil gas adjacent to existing building and potential impacts associated with former gas holder and scrubbers. Soil samples will be collected from this boring to evaluate potential impacts to soil. See Table 7 for soil sampling program and rationale. Assess soil gas in the vicinity of the former underground oil tanks. Soil samples will be collected from this boring to evaluate potential impacts to soil. See Table 7 for soil sampling program and rationale. Page 3 of 5

59 Soil Gas Probe ID Target Target Soil Gas Probe SG SG SG SG SG Table 8 Proposed Soil Gas Sampling Program and Rationale Analyses Sampling Rationale Assess soil gas in the vicinity of the former gas retorts. Soil samples will be collected from this boring to evaluate potential impacts to soil. See Table 7 for soil sampling program and rationale. Assess soil gas associated with impacted soil detected in boring P-26. Also to evaluate soil gas adjacent to existing building and potential impacts associated with the former washbox. If visually impacted soil is observed, collect and analyze soil samples as appropriate. Assess soil gas adjacent to existing building. Soil samples will be collected from this boring to evaluate potential impacts to soil associated with nearby former MGP structures. See Table 7 for soil sampling program and rationale. Assess soil gas in the vicinity of the former gas retorts and to evaluate impacts detected in boring P-36. Soil samples will be collected from this boring to evaluate potential impacts to soil. See Table 7 for soil sampling program and rationale. Assess soil gas in the vicinity of the lampblack track and turntable inside former Building Soil samples will be collected from this boring to evaluate potential impacts to soil. See Table 7 for soil sampling program and rationale. Page 4 of 5

60 Soil Gas Probe ID Target Target Soil Gas Probe SG SG SG SG SG Table 8 Proposed Soil Gas Sampling Program and Rationale Analyses Sampling Rationale Assess soil gas associated with impacts detected in borings P-35A and P-38. Assess soil gas adjacent to existing building. Soil samples will be collected from this boring to evaluate potential impacts to soil. See Table 7 for soil sampling program and rationale. Assess soil gas associated with impacts detected in boring P-28. Assess soil gas near former steel tank and impacted soil detected in borings P-32 and P-32B. Assess soil gas associated with shallow impacted soil detected in boring P-31 and potential impacts from the former generator building. Notes: VOCs = volatile organic compounds = total petroleum hydrocarbons as gasoline Page 5 of 5

61 FIGURES

62 P:\Drafting\Projects\PGE-1059\PGE \031-PGE Site Loc Map-Fig1.dwg 3/28/ :34:56 PM PST FORMER SALINAS MGP SITE 0 2,000 4,000 FEET APPROXIMATE SCALE FIGURE 1 SITE LOCATION MAP REFERENCE: 7.5 MINUTE U.S.G.S. TOPOGRAPHIC MAP OF SALINAS, CALIFORNIA DATED: 1947 PHOTOREVISED: 1984 FORMER SALINAS MGP SALINAS, CALIFORNIA Terra Pacific Group Environmental Engineering, Consulting, and Construction