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a } <br /> 9- <br /> 1 <br /> Problem Assessment Repurt December S, 1989 <br /> USA Petroleum Station No. 65, Lodi, California AGS 87050-3 <br /> Chemical results of water samples collected from MW-1, N[W-2, and NIW-3 indicated TVH <br /> ranged from 0.1063 ppm to 0.0504 ppm. La#�oratory.analyses indicated concentrations of j <br /> 'benzed, #aluene and tofal xylene isomers increased'iii'tlie`tlowngeadient directioa•in,thg <br /> sor3ilueiu�t Sly air rtlonatoward MW-3.: the sample from well MW-3, the benzene <br /> concentration was 0.0027 ppm which exceeded the drinking water standard of 0.0007 ppm <br /> set by the California Department of Health Services at that time. Ethylbenzene was <br /> detected in the water sample from well MW-1 but not in samples from the downgradient <br /> wells MW-2 and MW-3. <br /> 6 <br /> August 1988 <br /> M <br /> At the request of USA,we returned to the site on August 30, 1988. to collect water samples <br /> for subjective analyses,measure the groundwater levels to evaluate the slope of the ground- <br /> water surface across the site and collect water samples From wells MW-I through MW-3. <br /> Subjective analyses showed no evidence of hydrocarbon contamination. The average.slope" <br /> of the ground water was in a southeast direction similar to the August 24. 1987, evaluation <br /> r of the flow direction. <br /> } <br /> Fr - The Applied GeoSystems analytical laboratory in Fremont, California, (Hazardous Waste <br /> ---Testing Laboratory-No.153) conductedtheanalytical tests..-The results of this sampling are- 7— <br /> summarized <br /> --summarized in Table 3. Chemical results of water samples indicated that concentrations <br /> F <br /> i <br /> g <br /> 1 . <br /> Al <br /> s <br /> x <br /> i. <br /> �L <br />