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Proposal 10-005 Phase II ESA and Remedial Action/San Joaquin County,CA October 14,2005 <br /> liners from approximately 0.5-foot bgs. The soil samples will be capped, labeled and placed into <br /> a pre-chilled ice chest for temporary storage. The four discrete off-site soil samples will be <br /> delivered under chain-of-custody documentation to a State-certified hazardous waste testing <br /> laboratory and analyzed for CAM 17 metals using EPA Methods 6010/7000 series to determine <br /> background metal concentrations, according to the DTSC (2002). Each sample will be located <br /> on a Shea Homes supplied base map. <br /> We anticipate a total of 60 borings using the 400-square-foot sampling grid and up to 180 <br /> borings using the 200 square-foot sampling grid. <br /> Debris Pile/Solid Waste/Burn Pits <br /> A TERR,4SEARCH, inc. field geologist will collect at least two four-point composite soil samples <br /> from each debris pilelbum pit or solid waste area. The soil samples will be collected using clean <br /> brass liners from random depths and locations within the debris or burn pit area, and will be <br /> capped, labeled and placed into a pre-chilled ice chest for temporary storage. The locations of the <br /> soil samples will be marked on a Shea Homes supplied map. The soil,samples will be immediately <br /> delivered under chain-of-custody documentation to a State-certified hazardous waste testing <br /> laboratory for analysis. Prior to analysis, each set of four-discrete samples will be composited <br /> into one composite sample and analyzed for total petroleum hydrocarbons reported as gasoline <br /> (TPHg), total extractable petroleum hydrocarbons (TEPH), total oil and grease (TOG), volatile <br /> organic compounds (VOCs), semi-volatile organics"(SVOs), PCBsand pesticides, asbestos and <br /> CAM 17 metals using EPA Methods 5030, 8021, 8015 (modified), 418.1 (or equivalent), 8260, <br /> 8270, 8080, AB 435 and 6010/7000 series. <br /> Petroleum-Pipeline Assessrnent <br /> Approximately 200 feet of a Chevron/Texaco pipeline traverse the southwestern corner of the <br /> Silva-Vosti property. In order to adequately evaluate the lateral and vertical extent of possible <br /> petroleurihydrocarbon impaction to the subsurface soil and groundwater, both sides of the <br /> pipelines should be drilled and sampled. In this section of our proposal, we recommend drilling <br /> and sampling both sides of each pipeline easement. <br /> TERRASEARCH, inc. will obtain drilling permits from the SJCEHD and will clear all proposed <br /> boring locations through underground service alert(USA)at least 5-days prior to commencement of <br /> fieldwork. Once the drilling permits are obtained and USA has cleared the boring locations. <br /> A TERR,4SEARCH, inc. field geologist will observe a State-licensed drilling contractor drill <br /> borings to groundwater (at least 15 feet bgs) every 200-feet along the existing Chevron/Texaco <br /> petroleum pipelines for a total of approximately 2 borings. The borings will be advanced within 10 <br /> to 15 feet on either side from each pipeline (perpendicular from each pipeline). Soil samples will <br /> be collected at 5-foot intervals for description and possible laboratory analysis and each boring will <br /> be logged by a TERR,4SEARCH, inc. field geologist using the United Soil Classification System <br /> (USCS). Soil samples retained for laboratory analysis will be capped,labeled and placed into a pre- <br /> chilled ice-chest for temporary storage. Once soil sampling activities are completed, a groundwater <br /> TERR,4SEARCH, inc. Page 4 <br />