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T - ' <br />� a <br /> K f <br /> p <br />}9 <br /> l <br /> Results of Initial Investigation and Work Plan December 18, 1990 <br /> ,.� ARCO Service Station No. 548, Stockton, California AGS 30004-2 <br /> EWmate of Excavated Soil <br /> The approximate limits of the excavation are based on information gathered during our <br /> October 1990 investigation and are shown on Plate P-2. The actual size of the excavation <br /> will depend on site conditions and the concentration of hydrocarbons encountered during <br /> excavation. <br /> We estimate 900 cubic.yards of soil may be excavated. The estimate of the volume of soil <br /> is based on(1)the evaluated amount of backfill surrounding the existing gasoline tanks and <br /> excavating the existing tank cavity to approximately 18 feet below grade, (2) an evaluated <br /> A amount of soil excavated from pipeline trenches excavated 5 feet deep, 2 feet wide for a <br /> s <br /> total linear distance of 165 feet,(3) excavating the proposed gasoline tank cavity to 12 feet <br /> below grade and (4) excavating the waste-oil tank.cavity to 8 feet below grade. This <br /> estimate of excavated soil will vary depending on the final depths of the excavations. <br /> Methods of ]lectin Soil Samples <br /> The soil will be brought to the ground surface in an excay.for bucket,and the outer soil will <br /> be 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 /> is be"maintained throughout deliveryto the laboratory. <br /> Soil....samples..will alsobe-collected-from the-stockpiled soil to-evaluate treatment-and <br /> disposal options. Four soil samples will be collected for every 50 cubic yards of stockpiled <br /> 15 <br /> �4ie��ol>�d G490SYSAMS <br />