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1 <br /> February 14, 1992 AF=jzM � <br /> ARCO Service Station No 2130, Stockton, California <br /> 1 <br /> Results of analyses of samples of stockpiled soil will be submitted to the SJCPHS-EHD <br /> If hydrocarbons are detected at concentrations that are not acceptable for disposal in a Class <br /> III landfill, the soil will be aerated according to conditions stated in the aeration permit for <br /> uncontrolled soil aeration issued by the San Joaquin County Air Pollution Control District <br /> dated June 28, 1991 A copy of the letter is included in Appendix E of this document <br /> 1 Installation of Conductor Casing and Sub rade Pi in <br /> A maximum of six conductor casings, two between each new tank, will be installed from the <br /> base of the new tank cavity to the ground surface The conductor casing will be driven <br /> approximately 2 feet into native soil and then surrounded by clean pea gravel backfill <br /> Twelve-inch-diameter polyvinyl chloride pipe will be used for conductor casing The <br /> conductor casing will allow soil borings to be drilled and vapor-extraction wells to be <br /> constructed between the new tanks to continue further investigation of soil conditions <br /> beneath the tanks We also plan to install subgrade components in the product-line trenches <br /> to later be used in a vapor-extraction system <br /> LABORATORY ANALYSES <br /> Soil samples collected from the base of the tank cavity and product-line trenches will be <br /> submitted to a State-certified laboratory for analysis of TPHg by EPA preparation Method <br /> 5030 and modified EPA Method 8015 and BTEX by EPA Method 8020 Soil samples <br /> collected from under the former leaded gasoline tank will be submitted for analysis of total <br /> lead and ethyl-dibromethane Laboratory results will be discussed with ARCO personnel <br /> and with ARCO's approval forwarded to the SJCPHS-EHD A copy of a signed <br /> Authorization to Release Analytical Data form is included in Appendix E of this work plan <br /> • 30003-4W 10 <br />