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1 <br /> AZURE ENVIRONMENTAL <br /> December 26, 1996 AZ145-001 4 <br />' Harlan Knoll r <br /> San Joaquin County Public Health Services <br /> 445 N San Joaquin Street <br /> r^t h <br />' Stockton, California 95201 <br /> La � <br /> RE Soil Sampling Results and Recommendation for Soil Treatment Cell Closure <br />' Manna Pro Facility, Stockton, California 's <br /> Dear Mr Knoll "a <br /> This letter report presents the results of confirmation soil sampling and a recommendation for soil <br />' treatment cell closure at the former Manna Pro facility, 4004 South El Dorado Street in Stockton, <br /> California (Figure 1) Soil sampling was conducted at the soil treatment cell in accordance with <br /> Azure EnvironmentaI's August 19, 1996 proposal to the San Joaquin County Public Health <br />' Services (SJCPHS) The objective of conducting confirmation soil sampling at the soil treatment <br /> cell was to assess residual petroleum hydrocarbon concentrations in the treatment cell soil This <br /> report presents the soil sampling results and a rationale for recommending treatment cell closure <br />' 1.0 BACKGROUND <br />�j In July 1990 SEMCO, Inc , under contract to VMF Environmental, removed five fuel <br /> underground storage tank (USTs) at the Site and excavated hydrocarbon affected soils to a <br /> depth of approximately 15-feet below ground surface Approximately 4,000 cubic yards of <br /> hydrocarbon affected soil were removed from the tank excavation and stored on Site The <br /> affected soil was stored on the asphalt--paved parking area south of the excavation and covered <br /> with plastic The stockpiled sod was sampled and analyzed for total petroleum hydrocarbons <br />' as gasoline (TPHg) and diesel (TPHd), and benzene, toluene, ethylbenzene, and xylene <br /> (BTEX) compounds TPHg and BTEX were reportedly not detected in the stockpile samples <br />' Based on the TPHd analytical results, the stockpiled soil was segregated into separate <br /> stockpiles Approximately 1,200 cubic yards were found to be non-detect for TPHd, 1,700 <br /> cubic yards contained between 10 mg/kg and 50 mg/kg of TPHd, and 1,100 cubic yards <br /> contained between 50 mg/kg and 530 mg/kg of TPHd <br /> In April 1993, the 1,200 cubic yards of stockpiled soil that was characterized as non-detect for <br />' petroleum hydrocarbons were used to complete the backfilling of the tank excavation Soil <br /> generated from the installation of a sewer transmission line across the northern portion of the <br /> site was also used to backfill the tank excavation The remaining stockpiled soil was moved to <br /> the north end of the site into a soil treatment cell with approximate 145-foot by 170-foot <br /> dimensions The treatment cell berm was constructed using approximately 200 cubic yards of <br /> stockpiled soil containing no greater than 21 mg/kg of TPHd A 6-inch thick layer of clean <br /> sand was spread over the surface of the treatment cell The sand layer and berm was then <br /> covered with a 20-millimeter polyethylene liner The remaining stockpiled sod (approximately <br /> 2,600 cubic yards) was moved into the treatment cell for aeration/bioremediation. <br /> 828 Mission Avenue, San Rafael, CA 94901 0 4151485-9740 Fax 4151485-6062 <br />