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Site Background Information FORMER FISCO WAREHOUSE (Howard Lenz Property) 1648 Shaw Road, Stockton, California Ground water samples CPT2-76-80 and CPT3.74-78 were collected from HU1 TPH-d was Idetected in sample CPT3-74-78 at a concentration of 64 micrograms per liter (}ig/1) Total xylenes were detected in sample CPT2-76-80 at a concentration of 0 97 pg/l No other target analytes were detected in samples CPT2-76-80 and CPT3-74-78 I Ground water samples CPT1-92-96 and CPT2-92-96 were collected from HU2 sample P � P I CPT3-92-96 was collected at the boundary between HU2 and HU3 TPH-g and TPH-d were detected in sample CPT1-92-96 at concentrations of 530 gg/1 and 98 pIg/l, respectively Toluene, ethylbenzene and total xylenes were detected in sample CPT1-92-96 at concentrations of 9 9 µg/l,20 gg/1 and 140 µg/1,respectively No other target analytes were detected in the samples from HU2 Benzene and fuel additives were not detected at or above laboratory reporting limits in any of the ground water samples The general count of heterotrophic organisms in soil sample CPT 1-31 was 12 2 X 105 (colony-forming units/gram) cfu/g and the selective count was 2 1 X 105 cfu/g, which indicate a moderate population of organisms capable of gasoline metabolism However,the nutrient concentrations are at moderate to high levels to sustain ongoing bioremediation, rutrates (NOD, phosphate (PO4) and ammonium (NH4) were detected in the sample at concentrations of 57 2 parts per million (mg/kg), 22 mg/kg and 28 38 mg/kg, respectively, indicating The moisture content (MC) of the soil sample was 23% On 14 January 2002, an 8-hour SVE pilot test was conducted at the site using vapor well VW-2, screened from 15 feet bsg to 35 feet bsg as the extraction well The pilot test was performed to provide SVE data prior to installation of a full scale remediation system TPH-g was detected in the soil vapor samples at concentrations ranging from 1,300 gg/1 to 2,700 µg/1 Toluene, ethylbenzene and total xylenes were detected in the vapor samples at concentrations as high as 47 gg/1 toluene, 30 µg/1 ethylbenzene and 220 µg/1 total xylenes Benzene and MTBE were not detected at or above laboratory reporting limits in the gas/vapor samples The SVE unit was operated at approximately 2,300 RPMs for the eight-hour test The flow rate was measured between 25 cfm (standard cubic feet per minute) and 30 scfm for the eight-hour test OV readings ranged from 108 to 363 mg/kg Induced vacuum measured at the extraction well (VW-2) ranged from 54 to 72 inches of water • Advanced GeoEnviranmental,Inc