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I <br /> Site Background Information <br /> FORMER FISCO WAREHOUSE (Howard Lenz Property) <br /> 1648 Shaw Road, Stockton, California <br /> The model presented is interpretational and will be modified as more data is collected The four <br /> vertical zones identified are as follows (depths arc approximate and can vary by several feet across <br /> the site) <br /> IVadose Zone-Extending from surface grade to 54 feet bsg,the depth to the water table The vadose <br /> zone is predominantly fine grained material from surface grade to 54 feet bsg, with a coarse grain <br />' sand unit occurring between 20 feet and 25 feet bsg across a portion of the site The zone is <br /> characterized by low pore pressure <br /> Hydrological Unit 1 (HU1), at the top of the current saturated zone, extends from 54 feet to 80 feet <br /> bsg and is comprised of silty sand to sandy silt and characterized by predominantly high pore <br /> pressure <br />' Hydrological Unit 2 (HU2) extends from 80 to 96 feet bsg, it is composed of an upper 10-foot layer <br /> of fine-grained soil underlain by an approximately 5-foot sand and gravelly sand interval HU2 is <br />' characterized by low pore pressure <br /> Hydrological Unit 3 (HU3) extends from 96 feet bsg to and possibly beyond 134 feet bsg Silt and <br /> clay are the dominant soil type in the interval The interval is characterized by pore pressure <br /> variations from moderate to high pressures <br />' UNDERGROUND STORAGE TANK REMOVAL <br /> Two 550-gallon USTs were removed from the site on 03 October 1986 by Stockton Service Station <br /> Equipment Company According to correspondence from the San Joaquin County-Environmental <br /> Health Department(EHD),both USTs were reportedly used to store gasoline Upon removal of the <br /> USTs,one soil sample was collected from the floor of the excavation The sample was analyzed by <br /> California Water Labs,Inc ,a state-certified analytical laboratory, for total petroleum hydrocarbons <br />' quantified as diesel (TPH-d), benzene, toluene and xylene <br /> TPH-d and xylene were detected in the soil sample at concentrations of 3,000 milligrams per <br />' kilogram(mg/kg) and 0 188 mg/kg,respectively Benzene and toluene were not detected above the <br /> analytical method reporting limit of 010 mg/kg Based upon results of the soil sample analysis,the <br /> EHD required assessment of the lateral and vertical extent of hydrocarbon-impacted soil and/or <br /> Iground water in the area of the former UST <br /> I <br />' Advanced GeoEnvironmental,Inc <br /> I <br />