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April 22, 1987 AGS 8691-6 <br /> Beacon Service Station #1-502 - Lodi, California <br /> Only low levels of hydrocarbons were detected in the ground water <br /> collected from MW-5. The benzene concentrations detected are <br /> above action levels established by the California Department of <br /> Health Services. Other volatile hydrocarbon constituents are <br /> within drinking water standards, and all hydrocarbon levels are <br /> substantially below values detected in monitoring wells MW-1, MW- <br /> 2, and MW-4. We thus conclude that the ground water <br /> contamination observed in MW-1 and MW-2 does not extend far <br /> beyond the location of MW-5 at the edge of the site. <br /> GROUND WATER GRADIENT <br /> Evaluation of relative ground water elevations in the five <br /> monitoring wells on site indicates that the average gradient is <br /> to the south southwest. Table 2 is a summary of well elevation <br /> data obtained to date. Data from MW-1, MW-2, and MW-3 show <br /> essentially the same direction of ground water flow, although the <br /> slope of the potentiometric surface has changed from 0. 471 /100 ' <br /> on October 14, 1986 to 0. 341 /100 ' on March 31, 1987. <br /> 9 <br /> .4,o,�/ied GeoSystems <br />