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q <br /> April 28, 1988 AGS Job No. 03801.2--1 <br /> Dormer UNOCAL Service Station, Stockton, California <br /> it <br /> assigned consecutive sample designations. The locations of these <br /> samples within the tank cavity are shown on <br /> the Generalized Site Plan (plate P-2) . <br /> quderate and obvious hydrocarbon odor, inferred to be gasoline, <br /> was present in three soil_ samples. Some evidence of soil <br /> contamination was noted in the native materials below the tanks <br /> 5..7 and in the walls of the excavation. Because subjective evidence <br /> of hydrocarbon contamination was detected below the former <br /> gaso?.ine storage tanks following their removal, additional soil <br /> was excavated in an attempt to reluce the level of remaining <br /> contaminants at the request of UNOCAL and with the approval of <br /> the SJ'LHD. The tank cavity dimensions were enlarged to <br /> approximately 25 by 35 feet, and a bench was cut into the <br /> periphery to a depth of 7 to 8 feet. An excavator was lowered <br /> onto this bench and continued to excavate below the former tanks <br /> to a total depth of 26 feet. <br /> During excavation, an attempt was made to segregate relatively <br /> contaminated soil from relatively uncontaminated soil using a <br /> field organic vapor analyzer. Several samples were taken at <br /> random locations within the relatively contaminated soil, <br /> composited into one sample by the laboratory, and analyzed for <br /> -- 4 - ---- - ------- <br /> ------ -- ----- <br /> Applied GOOSYstel"s <br />