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e <br /> October 13, 3987 <br /> rT USA Station too, 65, Lodi, California AGS 87050_2 <br /> ra <br /> and ground water is restricted to the USA station site. The <br /> results of laboratory analyses of water from wells Mw-1 through <br /> Mw-3 also suggest that the concentrations of the hydrocarbon <br /> contaminants in the water have attenuated within the confines of <br /> the station property to near or below levels that are recommended <br /> as acceptable for drinking water. We infer from this information <br /> that no threat to current ground-water use at offsite wells <br /> appears to exist due to the presence of contamination below the <br /> subject site. <br /> Based on the information gathered, we recommend that wells S-1, <br /> S-2, and wells MW_1 through Mw-3 be monitored quarterly to <br /> establish whether the levels of hydrocarbon contaminants are <br /> decreasing with time. The quarterly monitoring should include <br /> subjective sampling of water in the wells to examine for floating <br /> product, product sheen, emulsion, and odor. The wells should <br /> then be purged a minimum of three to four well volumes and then <br /> be sampled for laboratory analyses of concentrations of <br /> hydrocarbon constituents. The next sampling should take place <br /> during the first week in December 1987. The depth to water <br /> should also be measured so that the direction of <br /> -ground-water- <br /> ;low <br /> round-water__.flow may be evaluated at each sampling episode. These . <br /> measurements will also indicate any effects of the irrigation <br /> _Mai <br /> 21 <br />