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v <br /> * Monitor well MW-3A, which was screened properly based on the groundwater <br /> elevation during July, had a benzene concentration of 47 µg/l, while monitor well <br /> MW-3 (groundwater above screen) had a value of 75 µg/1 As a result of the fact <br />' that the improperly screened well had a higher benzene concentration, an <br /> inference can be made that the site is in fact naturally attenuating, the significant <br /> 1-- <br />' reduction in groundwater hydrocarbon concentrations 1s valid and not merely a <br /> function of the rise in groundwater elevations above screened intervals <br /> • Benzene concentrations for the July 25, 1996, sampling were below the laboratory <br />' detection limit in monitor wells MW-1, MW-4, MW-5, MW-6, and MW-7 The <br /> maximum benzene value during the July sampling was 134 14g11 in monitor well <br /> MW-10. <br /> • Analyses for MTBE were all below the laboratory detection limit of 5 µg11. TPH <br /> groundwater results were below the laboratory detection limit in monitor wells <br />' MW-1, MW-4, MW-5, MW-6, and MW-7 The maximum concentration was in <br /> monitor well MW-3A (4,840 µg/I). <br /> 1 <br /> 8 <br /> 1 <br />