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TANK CLOSURE REPORT—BEACON STATION #419 -4- 2350 Waterloo Road, Stockton, CA Ab" Project No 19011 03 ' The soil stockpiled on October 22, 1993, was removed from the site on October 25, 1993, by Ben's Truck and Equipment Company and transported to their facility in Red Bluff, California, ' for remediation. Soil from the overexcavation that was stockpiled on site on October 26, 1993, was removed on October 29, 1993, by MP Environmental and transported to Forward Landfill in Stockton, California, for disposal 6.0 DISCUSSION Approximately 950 cubic yards of soil were excavated at the site in the attempt to completely ' remove all petroleum hydrocarbon impacted soils from the property The former tank basin area was overexcavated to depths ranging from 18 to 30 feet below grade. Analytical results from ' soil samples collected from beneath the pump island indicated that overexcavation was not necessary in this area. Three soil samples (T1A, T2A, and T3 A) collected from the north end of the former tank basin at approximately 30 feet below grade (the maximum depth of overexcavation) contained concentrations of TPHg exceeding 100 mg/kg Concentrations of TPHg were reported to be below the detection limit in soil samples collected from the southern extent of the UST excavation at depths ranging from 18 to 22 feet below grade. The overexcavated areas have since been backfilled by Walton Engineering using clean gravel backfill that was compacted ' subject to recognized engineering practices ' 7.0 REMARKS ' We recommend that a copy of this report be submitted to Mr Michael J Infurna Mr Gordon Boggs Public Health Services California Regional Water Quality County of San Joaquin Control Board, Central Valley Region Post Office Box 2009 3443 Routier Road ' Stockton, California 95201 Sacramento, CA 95827-3098 RPT020 ECD