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5. REMEDIAL ACTIONS <br /> An SVE system was installed in June 1994. The system operated continuously from June 1994 <br /> through December 1996. Clustered well VEW-1 and well VEW-2 were used to extract soil <br /> vapors. The system was operated intermittently during the first quarter 1997. Pertinent <br /> information such as initial and final concentrations of soil vapors, flow rates, mass extraction <br /> rates, and cumulative mass extracted are not readily available. Stratus will update the SCM when <br /> this data becomes available. <br /> Soil samples collected from borings drilled in the vicinity of the former UST prior to SVE <br /> operation (borings MW-1, VEW1, CB-/NEW-2, MPI, and MP2) indicated hydrocarbon impact <br /> as deep as 66 feet bgs. Results from soil samples collected in 1999 (boring B-I/MW-9) and 2001 <br /> (boring CPT-1), subsequent to SVE system operation, indicate the SVE system was effective in <br /> reducing concentrations of residual petroleum hydrocarbons in soil. <br /> Elevated concentrations of TPHG (5,000 mg/kg) and benzene (70 mg/kg) were detected in the <br /> soil sample collected from 66 feet bgs at boring MP-2 prior to SVE operation. TPHG and <br /> benzene concentrations were not detected in the soil sample collected from 66 feet bgs in boring <br /> B-11MW-9 (approximately 5 feet east of boring MP-2) following SVE operation. Likewise, <br /> TPHG (4,800 mg/kg) and benzene (52 mg/kg) were detected at 46 feet bgs in boring MP-2 prior <br /> to SVE operation. Concentrations of TPHG and benzene were not in the soil sample collected <br /> from 42.5 feet bgs in boring CPT-1 (approximately 5 feet east of boring MP-2) following SVE. <br /> These data indicate the SVE system was effective in reducing residual hydrocarbons from the <br /> soil beneath the former UST to a depth of approximately 66 feet. <br /> i <br /> p:\Apache Plastics\Reports\Apache SCM.doc Page 11 5tratue <br />