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._,s�I NO MNMO., ELM w xz sir• <br /> a r� g' <br /> 2 <br /> 0-01 <br /> r•+ <br /> laws and regulations, hydrostatic tests were conducted at the <br /> end of December, 1986, and as a result of this testing, a leak <br /> was suspected in the west tank. The volume of gasoline which <br /> leaked was considered to be small, based on inventory records <br /> and subsequent soil sampling data (Anheuser-Busch, personal <br /> communication ) . <br /> Soil sampling in the vicinity of the tanks was performed <br /> following hydroz:tatic testing. The analytical results are <br /> presented in Table 2-1 . The results suggested elevated levels <br /> of miscellaneous hydrocarbons under both tanks through a depth <br /> of 28 ft. When the leak was detected, abandonment and <br /> excavation procedures began. Gasoline was pumped out of the <br /> nest tank prior to excavation. The east tank was opened and <br /> Emptied of sand (approximately 20 cubic yards) while still in <br /> place. The sand from the east tank was spread evenly in a <br /> thin layer on the northwest edge of the property per San <br /> Joaquin Air Pollution Control District (APCD) requirements to <br /> enhance volatilization and biodegradation of residual <br /> volatiles. Both tanks were cleaned and scrapped offsite. <br /> The width of the excavation was 14 ft, with additional <br /> dimensions shown approximately in Figure 2-2 . The dimensions <br /> of the soil contamination removal area mere 14 ft by 15 ft by <br /> 16 ft. Excavation was accomplished using a backhoe. A total <br /> estimated soil volume of 450 cubic yards was removed from the <br /> area. The contaminated soil (estimated volume of about 120 <br /> cubic yards) was deposited in the northwest part of the <br /> property as per San Joaquin APCD requirements. The resulting <br /> pit was filled in. with clean, compacted, crushed rock and was <br /> ultimately paved over with asphalt. <br /> 2-3 <br />