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' 9.0 PROPOSED BACKFILL - GASOLINE TANK PIT <br /> RESNA Industries proposes to backfill the existing open excavation from the removal of the gasoline <br /> storage tanks Stockpiled soil originally excavated from the pit and additional clean fill will be placed <br /> into the excavation and compacted Subsequent to compaction the backfilled pit will be covered with <br /> a relatively impermeable asphalt layer to mitigate any downward migration of petroleum hydrocarbons <br /> Laboratory analyses of 4 to 1 composite samples on October 17, 1991 from the soil stockpiled from <br /> the excavated gasoline pit exhibited trace levels of toluene (0 0068 ppm), xylenes (0 032 ppm) and <br /> TPHD (5 7 ppm) Laboratory data sheets and chain-of-custody documentation are present in the <br /> Problem Assessment Report dated December 23, 1991 Backfilling of the soil does not pose a <br /> ' significant threat to the soil immediately adjacent to the tank pit or the underlying groundwater <br /> ' approximately 55 feet below the pit <br /> ' 10.0 REFERENCES <br /> Department of Water Resources, Bulletin No 146, San Joa urn Coun1y Ground Water Investigation, <br /> July 1967 <br /> ' RESNA Industries, Problem Assessment Report, Soil Contamination, December 23, 1991 <br /> San Joaquin County Flood Control and Water Conservation Distnct, Lines of E ual Elevation oWater <br /> in Wells, Spring 1991 <br /> San Joaquin County Public Health Services, Correspondence, Laurie J Cotulla, September 16, 1991 <br /> 1 <br /> State Water Resources Control Department, LUFT Manual, October 1989 <br /> R 042992 TIL 17 <br />