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Applied GeoSystems 4191-E Power Inn Road,Sacramento,CA 95826 1916)452-2901 a FREMONT a IRVINE •HOUSTON a BOSTON a SACRAMENTO a CULVER CITY a SAN)OSE September 4, 1990 0806gdem AGS 86091-8 Mr. Glenn Dembroff Ultramar Inc. 525 West Third Street Hanford, California 93230 Sub;pct: Letter Report on Second Quarter 1490 Sampling of Ground-Water Monitorir..g Wells at P?!acon Service Station No. 502, 35 North Cherokee Lane, Lodi, California: i Mr. Dembroff: This report presents the results of the second quarter 1990 ground-water sampling that Applied GeoSystems conducted at Ultramar's request at the subject site. (see the Site Vicinity Map, Plate P-1). The purpose of this sampling program is to monitor the concentration of dissolved hydrocarbons in ground water at the site. Work included.. measuring depths to water,=mpling ground water for subjective and laboratory analyses of hydrocarbons,and evaluating the ground-water gradient beneath the site. The locations of the monitoring wells are shown on the Generalized Site Plan, Plate P-2. Present Ground-Water Sampling On June 29, 1990, a geologist from Applied GeoSystems measured:later levels in the monitoring wells (see Table 1). These water levels were used to construct the Potentiometric Map,Plate P-3. The direction of ground-water flow beneath the site on June 29, 1990, was evaluated to be to the southwest; the gradient was evaluated to be 0.0046. We collected ground-water samples from each monitoring well and examined the samples for floating product, sheen, and other subjective evidence of hydrocarbons. No subjective evidence of hydrocarbons was observed in any of the monitoring wells. The geologist then - -------------- - - - --collected ground-water samples from e;ch monitoring-well-for laboratory analysis--Water--- purged from the wells was placed in 55-gallon drums approved for this use by the Department of Transportation and stored temporarily at the site pending removal by Ultramar, J _