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2 0 CQRRECTIVE ACTIONS <br /> This Section summarizes the corrective actions performed at the former AFPC Stockton facility <br /> These actions include a preliminary site assessment and subsequent soil sampling and analysis conducted <br /> by Bechtel National Incorporated (BNI) in 1985 and 1986 After the tanks were taken out of service in <br /> 1986, J H Kleinfelder and Associates conducted a soil and water investigation which was completed in <br /> 1987 The 10,000 gallon diesel and 500 gallon waste oil tanks were removed under the supervision of <br /> San Joaquin County Public Health Services - Environmental Health Division (PHS-EH) in 1988 A <br /> supplemental soil and groundwater investigation, feasibility study, and remedial action plan was <br /> completed in 1988 by Dames & Moore <br /> In 1990, the RWQCB became the lead regulatory agency and requested a work plan for soil <br /> remediation and additional groundwater monitoring Dames & Moore completed this work plan in early <br /> 1990 and began remedial actions in the vicinity of the impacted sods in mid 1990 Excavated soil was <br />' treated as specified in the work plan and after treatment the soil was fully characterized and classified as <br /> a non-hazardous waste with diesel residues After all analyses were reviewed by Browning Ferris <br /> Industries (BFI), their Class II landfill in Livermore, California accepted the soil for disposal In 1991, <br /> San Joaquin PHS-EHD requested a completed application/work pian for the closure of a buried product <br /> line Dames & Moore prepared the requested application and work plan for PHS-EHD which approved <br /> the plan and the pump island and product lines were removed, and decontaminated in 1991 A small <br /> volume of soil was removed, treated and disposed at Port Costa Materials, a licensed treatment facility <br /> 2 1 PRELIMINARY INVESTIGATIONS <br /> Bechtel National Incorporated (BNI) conducted a preliminary site investigation which consisted <br /> of two phases of soil sampling in the vicinity of the maintenance shop The first phase consisted of a <br />' series of three shallow test pits in the vicinity of a drainage ditch located along the northwestern corner <br /> of the maintenance shop The location of these test pits and all subsequent soil borings and monitoring <br />' wells are shown in Figure 2 1 Soil samples collected from the test pits at the 0 to 1 foot interval, 1 to <br /> 2 foot interval and 2 to 3 foot interval were analyzed for total petroleum hydrocarbons (TPH) as gasoline <br /> and diesel using a gas chromatography flame ionization potential technique with detection limits ranging <br /> Lfrom 20 to 100 mg/kg TPH Lead and chlorinated organic compounds were also measured in selected <br /> soil samples and were analyzed by conventional atomic absorption spectrometry and gas chromatography <br /> combined with mass spectrometry (GC/MS) A summary of the BN1 soil analyses is given in <br /> Appendix A <br /> Diesel fuel was reported in one of four samples at 1,000 mg/kg TPH, at 1 5 to 2 5 feet bgs <br /> (Appendix A) Pentachlorophenol was reported at 33 mg/kg in one of three soil samples taken from an <br /> SAC36 046 3 <br />