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i <br /> r <br /> rResults of Initial Investigation and Work Plan December 18, 1990 <br /> Aft RCO Service Station No. 2076, Lodi, California AGS 30008.2 <br /> depending on site conditions. One soil sample will be collected under each proposed tank <br /> location. Sidewall soil samples will be collected only if soil exhibiting evidence of <br /> ® hydrocarbons remains in place. <br /> Excavated soil will be stockpiled onsite. The stockpiles will be covered with plastic sheeting <br /> ® to restrict vapor emissions and control dust. Composite soil samples will be collected and <br /> analyzed to evaluate disposal options. If laboratory results of composite soil samples <br /> indicate concentrations of TPHg and BTEX compounds are less than fL and 1.0 ppm, <br /> respectively, the soil will be used to backfill the former gasoline tank cavity. If laboratory <br /> ®. results of the composite soil samples indicate concentrations of T Hg and .BTEX j <br /> j`; <br /> compounds are greater than 10 and 1.0 ppm respectively, the soil will be disposed of <br /> properly.. The disposal of stockpiled soil is ARCO's responsibility. <br /> Estimate of Excavate } <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 /> r: excavation. <br /> We esfsmate 900 ct bic yards of soil may be excavated. The estimate of the volume of soil <br /> t3 is based on (1) the.amount of backfill surrounding the.existing tanks and excavating the <br /> existing tank.cavity to approximately 18 feet below grade, (2) an evaluated amount of soil <br /> r: excavated from pipeline trenches excavated 5 feet deep, 2 feet wide for a total linear <br /> distance of 130 feet, and (3) excavating the proposed tank cavity to 12 feet below <br /> 13 <br />