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Results of Initial Investigation and Work Plan <br /> ARCO Service Station No. 760, Lodi, California December 1$, 1990 <br /> AGS 38048-4 t <br /> with aluminum foil and plastic end caps and taped. The tube will be labeled and <br /> immediately placed on ice for transport to the laboratory. Chain of Custody Records will <br /> be maintained throughout delivery to the laboratory. <br /> Soil samples will be collected from the stockpiled soil to evaluate treatment and disposal <br /> options. Four soil samples will be collected for every 50 cubic yards of stockpiled soil. <br /> Each group of four samples will be composited into one sample by the laboratory. Soil <br /> samples will be collected in clean brass tubes from approximately 6 inches below the surface <br /> of the stockpiles. <br /> 1'nstallation of nductar 'n <br /> After excavating, if results of laboratory analyses indicate soil samples collected from the <br /> r base of either gasoline tank excavation contain hydrocarbons in concentrations that warrant <br /> remediation, a maximum of six conductor casings, two between each tank,will be installed <br /> from the base of the tanks 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 between the new tanks to continue <br /> further investigation of soil conditions beneath the tanks. Vapor-recovery wells could be <br /> installed in these borings if remediation of soil is warranted. <br /> l <br /> LABORNrORY ANALYSES <br /> Soil samples collected from the bottom of the existing and proposed gasoline tank cavities <br /> will be submitted to a State-certified laboratory for analysis of TPHg by Environmental <br /> Protection Agency (EPA) preparation Method 5030 and modified EPA Method 8015 and <br /> w <br /> 17 <br /> w <br /> Applied Geo SlbrlenyS <br />