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July 8, 1988 AGS Job No. 38032-1 <br /> !� UNOCAL Service Station No. 6981, Itockton, California <br /> r� <br /> Based on previous work in the area and conversations with <br /> personnel of the California Regional Water Quality Control Board, <br /> Central Valley Region, the depth to first ground water is <br /> estimated to be approximately 30 feet. Ground water is inferred <br /> to have a southeasterly gradient based on regional data supplied <br /> by California Water Service of Stockton, California, and Applied <br /> Geosystems project sites located in the area. This gradient can <br /> vary locally depending on seasonal fluctuations of ground-water <br /> 4 levels and local ground-water pumping. <br /> FIELD WORK AND METHODS <br /> Initial work at the site began on May 13, 1988, when a geologist <br /> from Applied GeoSystems collected nine soil samples from 4-foot <br /> deep test pits located on each side of the two dispenser islands z <br /> and one located perpendicular to and at the southern end of the <br /> dispenser islands. These samples were collected in response to <br /> - ` contamination encountered during installation of a gasoline- <br /> blending system at the service station. Samples were collected <br /> using a hand operated percussion sampler to drive a clean brass <br /> sleeve into the soil immediately after it was brought to the <br /> surface in a backhoe bucket. Samples were then sealed with <br /> aluminum foil, a plastic cap, and air-tight tape, before being <br /> labeled and placed in iced-storage.___A-Chain_of Custody_-Record------- <br /> 4 <br /> Record -- - <br /> AA,0,0/1ed Geosystems -- <br />