Laserfiche WebLink
El§M�`WW7 <br /> F <br /> l 28, 1988 AGS Job No. 038012-1 <br /> e: UNOCAL Sea.-vice Station, Stockton, California <br /> FIELD WORK AND METHODS <br /> An Applied GeoSystems geologist was present at the site on March <br /> 30, 1988 to collect eight soil samples from beneath the base of <br /> the tanks. The tanks were removed, and soil was excavated from <br /> the tank cavities with a backhoe. The removed tanks were hauled <br /> by Triangle, Inc. , to its facility in Sacramento. <br /> Six soil samples were collected from native clay and silty clay <br /> at an approximate depth of lb feet below the ground surface in <br /> the gasoline storage tank cavity, or 2 feet below the bases of <br /> the former gasoline tanks. Samples were collected below each end <br /> of the tanks and below the former fill ports at the centers of <br /> the tanks. Another sample was collected from an approximate <br /> depth of 8 feet, or 2 feet below the base of the former waste oil <br /> tank. <br /> All samples were collected by driving a hand-operated percussion <br /> sampler fitred w; it a cleaned brass sleeve into the soil <br /> j immediately after it was brought to the surface in the backhoe <br /> bucket. The sleeve was removed from the sampler_and seal ed_.with___.—_.____ <br /> aluminum foil, plastic caps, and airtight tape. It was then <br /> labeled and placed in iced storage. The samples collected were <br /> 3 <br />