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June 7, 1988 <br /> AGS Job No. 87048--2 <br /> Page 3 <br /> The results•of the analyses indicate that levels of total <br /> volatile hydrocarbons have decreased in well MW-2 and increased <br /> slightly in wells MW-1., MW-3, and MW-4. Levels of benzene in <br /> ground water have decreased from the previous sampling event in <br /> well MW--2, increased slightly in wells MW-1 and MW-3, and <br /> remained below laboratory detection limits in well MW-4. The <br /> concentration of benzene in ground water from wells MW-1, MW-2, <br /> and MW-3 exceeds the maximum level for drinking water recommended <br /> by the Department of Health Services. However, the levels of <br /> .0012 parts per million (ppm) benzene in water from well MW-1 and <br /> .0019 ppm benzene in water from well MW-3 are only slightly above <br /> the allowable safe drinking water standard of .0007 ppm. The <br /> level of benzene in water from well MW-2 has decreased from .438 <br /> ppm during the previous sampling event to .0249 ppm. Levels of <br /> ® toluene, ethyibenzene, and total xylene isomers remain within <br /> recommended drinking-water levels in all wells. <br /> Previously existing dry wells at the site which served as catch <br /> basins for station runoff have now been destroyed. In the past, <br /> these wells may have served as conduits, allowing surface <br /> ® contaminants to react: ground water. Because 1) the dry wells <br /> have now been destroyed, 2) ground water from three of four wells <br /> at the site is at or near drinking-water quality, and 3) the <br /> hydrocarbon constituent levels in the four wells are <br /> significantly lower than those initially obtained, Applied <br /> GeoSystems recommends continued. quarterly.monitoring:cf.>,grround- <br /> ® water quality in .the -monitoring.:wells as a sufficient:response to. <br /> site conditions. . We have tentatively scheduled the next sampling: <br /> event for July 25, 1988. . <br /> ARR11ed Ge®SYStems <br />