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Work Plan for Ile-excavation May 3, 1989 <br /> Former Texaco Service Station, Manteca, California AGS 38053-1 <br /> contamination. The locations of the monitoring wells are shown <br /> on Plate P-2. Subjective evidence of contamination was present <br /> in soil samples collected from the boring located north of the <br /> former product-storage tanks. The results of laboratory analyses <br /> of soil samples collected from the unsaturated zone in this <br /> boring indicate that contaminants are present at relatively low <br /> levels (23 and 29 ppm TPH as gasoline) . No subjective evidence <br /> of soil contamination was present in the boring located on the <br /> southern edge adjacent to the former tank cavity. <br /> On October 25, 1988, a geologist from Applied GeoSystems visited <br /> i' the site to develop the monitoring wells; on October 27, a <br /> geologist from Applied GeoSystems measured depths to water, <br /> subjectively analyzed ground water in the monitoring wells, <br /> purged the monitoring wells, and collected ground-water samples <br /> for laboratory analysis. Analysis of ground water from each <br /> monitoring well indicated relatively low levels of TPH as <br /> gasoline. Ground-water samples were not analyzed for TPH as <br /> diesel. Laboratory analyses of samples from monitoring wells <br /> MW-2 and MW-3 showed concentrations of benzene in excess of the <br /> action level (0.0007-ppm) for this gasoline constituent in <br /> drinking water recommended by the DHS. <br /> 5 <br /> AilWAXed 000SysteMS <br />