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Results of Initial Investigation and Work flan December 18, 1990 <br /> ARCO Service Station No. 2076, Lodi, California AGS 30008-2 <br /> This estimate of excavated soil will vary depending on the final depths of the excavations. <br /> �ethasds asf Collectinst Basil Sar tlnleg <br /> The soil will be brought to the ground surface in an excavator bucket,and the outer sail will <br /> b-,scraped away. A clean.6-inch-long,2-inch-diameter,clean brass tube will be driven into <br /> the soil using a percussion sampler. The brass tube will be removed and the ends covered <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 /> z Soil samples will also be collected from the stockpiled soil to evaluate treatment and <br /> is xut� <br /> disposal options. Four soil samples will be collected for every 50 cubic yards of stockpiled <br /> soil. 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 /> i <br /> of the stockpiles. <br /> In,stallatian of Conductor Casing 1 <br /> After excavating, if results of laboratory analyses indicate soil samples collected from the <br /> base of either 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 /> 14 <br /> 5 � .4oap/led �Sea>'�'�fertts <br />