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WIN <br /> e <br /> Problem Assessment Report <br /> USA Petroleum Station No, 65, Lodi, California December S, 1989 <br /> AGS 87050-3 <br /> In response to hydrocarbon contamination detected during this initia: investigation, the <br /> Central Valley Regional Water Quality Control Board requested that USA perform a site <br /> assessment. At the request of USA, Applied Geo$vsterns prepared a Work Plan for <br /> additional soil borings and groundwater monitoring wells to delineate further the extent <br /> of the initially detected contamination (Applied GeoSyslcros, May 29, 1987). <br /> r. <br /> Previous Work Conducted b A lied Geo stems <br /> r - <br /> a <br /> _ Augusr 1987 <br /> On,August 11 and 12, 1987,Applied GeoSystems drilled three 8-inch-diameter borings(B- <br /> 4 <br /> 1 through$-3)and installed monitoring weds MIV-i through ITV-3 in the locations shown <br /> an Plate P-3. On August 24, 1987, we ret <br /> urned to the site to collect ground-water samples <br /> for subjective analyses, measure.ground water levels to evaluate the slope of the groind- <br /> water surface across, the site, and collect the ground water samples for laboratory analyses <br /> in the three wells. Subjective analyses showed no evidence of 11-drocarbon contamt...a,,on. <br /> The grounc:-water elevation used to calculate the ground-water g wat flow er i1 direction was <br /> ;mss calculated by subtracting_the.static...w <br /> r7 <br /> ater-level-from-the-monitoring wellfiea., clevcaion. <br /> The ground-water elevation ter eltion information was used to construct ground-wafer gradient n2a <br /> 5 { - <br /> J 6 <br /> �pwJ�ed Geasystems __._ <br />