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June 26, 1992 <br /> ARCO Service Station No. 549, Stockton, California <br /> Laboratory AnaLys-es <br /> The soil samples collected from just above the first-encountered ground water and selected <br /> samples with photoionization detector readings were submitted to the laboratory for analysis <br /> of TPHg and BTEX using modified Environmental Protection Agency (EPA) Method 8015 <br /> and Method 8020, respectively. Soil samples collected from the boring near the waste-oil <br />•; tank (B-12) were also analyzed for total petroleum hydrocarbons as diesel (TPHd) using <br /> EPA Method 8015 (modified), TOG using Standard Method 4131, volatile organic <br /> compounds (VOC's) using EPA Method 8010, and total cadmium, chromium, nickel, lead, <br /> chromium VI, and zinc using EPA Method 7000. <br /> Ground-water samples were analyzed for TPHg and BTEX using modified EPA Method <br /> 8015 and Method 602, respectively. A water sample collected from the well downgradient <br />� . of the waste-oil tank (well MW-1) was analyzed for total oil and grease (TOG) using EPA <br /> Method 601. <br /> The samples were analyzed at the Enseco-California Analytical Laboratories in West <br /> S <br /> Sacramento, California (Hazardous Waste Testing Laboratory Certificate No. 106), and <br /> Applied Analytical Environmental Laboratories in Rancho Cordova, California (Hazardous <br /> Waste Testing Laboratory Certificate No. E773). <br /> i <br /> RESULTS OF INVESTIGATION <br /> Site Geolo�y. <br /> Sediments underlying the site consist primarily of silt with some clay and silt with fine- to <br /> medium-grained sand. The sedimentary units are generally discontinuous. From the ground <br /> surface to approximately 10 to 15 feet below grade, sediments consist of silt with some clay <br /> 30004-4 7 <br />