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.. =' <br /> App/led GeoSystems 4191-E Power Imi Road, Sacramento, CA 95826 (9161 452-2901 <br /> • FREMONT s IRVINE • HOUSTON • BOSTON Is SACRAMENTO u CULVER CITY a SAN )OSE <br /> ! December 20, 1990 <br /> 1015gdeni <br /> AGS 86091-8 <br /> Mr. Glenn Dembroff <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject: Third Quarter 1990 Sampling of Ground-Water Monitoring Wells at Beacon <br /> Service Station No. 502, 35 North Cherokee Lane. L)di, California. <br /> Mr. Dembroff: <br /> This report presents the results of the third quarter 1990 groundwater sampling that <br />. Applied GeoSystems conducted at Ultramar's request at the subject site (see the Site <br /> Vicinity Map, Plate P-1). The purpose of this sampling program is to monitor the <br /> concentration of dissolved hydrocarbons in ground water at the site. Work included <br /> measuring depths to water, sampling ground water for subjective and laboratory analyses of <br /> hydrocarbons, and evaluating the ground-water gradient beneath the site. The locations of <br /> the monitoring wells are shown on the Generalized Site Plan, Plate P-2. <br /> Present roue - ater Samplin <br /> On September 25, 1990, a geologist from Applied GeoSystems measured water levels in the <br /> monitoring wells (see Table 1). These water levels were used to construct the <br /> Potentiometric Map, Plate P-3. The measurement from monitoring well MW-1 indicated <br /> that the groundwater surface has dropped below the total depth of the well. The direction <br /> of ground-water flow beneath the site on September 25, 1990, was evaluated to be to the <br /> southwest; the gradient was evaluated to be 0.0037. -� ---- <br /> We collected groundwater samples from each monitoring well except well MW-1 and <br /> examined the samples for floating product, sheen, and other subjective evidence of <br /> hydrocarbons. No subjective evidence of hydrocarbons was observed in any of the <br /> monitoring wells. The geologist then collected ground-water samples from each monitoring <br /> well for laboratory analysis. Fater purged from the wells was placed in 55-gallon drums <br /> approved for this use by the Department of Transportation and stored temporarily at the <br /> site pending removal F,y Ultramar. <br />