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F i <br /> Results of Initial Investigation and Work Plan December 18, 1990 <br /> ARCO Service Station No. 760, Lodi, California AGS 38048-4 <br /> m <br /> o Observe excavation of soil in and around the proposed gasoline-tank cavity <br /> to approximately 12 feet below grade. <br /> o Collect appropriate soil samples from the base of the proposed tank cavity to <br /> evaluate hydrocarbons, if present, in soil were removed by excavation. <br /> o Install a max:mum of six conductor casings in either tank cavity to allow soil <br /> borings to be drilled between the new tanks ai a later date,if soil containing <br /> greater than 10 ppm of TPHg and greater than 1.0 ppm benzene remains at <br /> the bottom of either tank cavity after the safe operating limits of the <br /> equipment is reached. <br /> o Collect and analyze one soil sample every 20 linear feet below the former <br /> product lines. <br /> o Observe excavation of soil in and around existing waste-oil tank until the safe <br /> operating limits of the equipment wdth respect to sidewall stability and the <br /> sidewall stability and surrounding structures are reached and submit <br /> appropriate soil samples. <br /> f,3 <br /> o Collect and analyze soil samples from the stockpiled so:!, evaluate disoosal <br /> options and apprise ARCO of the disposal options for the soil. <br /> o Submit soil samples associa.ted with the gasoline cavaties, to a State-certified <br /> laboratory for analysis of ITHg and BTEX. Soil samples collected from <br /> under the former leaded gasoline tank will be submitted for analysis of total <br /> and o%-Mc lead. 1'1r_ I` <br /> o Submit soil samples associated with the former waste-oil tank cavity to a <br /> State-certified l-.boratory for analysis of TPHg. HTEX, total petroleum <br /> hydrocarbons as diesel (TPHD), and total oil and grease (TOG). <br /> o Prepare a report summarizing tank removal operations and our findings, <br /> conclusions, and::•ccommendations. <br /> 4r <br /> 13 <br /> AP <br /> p/ied Ge0SYSMIM5 <br />