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I <br /> TPH-g and benzene have attenuated to Less than detectable levels in MW-9 west of the UST area <br /> of the site TPH-b and benzene have consistently remained at less than detectable levels since <br /> t1995 to all quarterly mortitoang episodes <br /> Yearly Average Benzene and TPH-g Concentrations from NIW9 <br /> Year Average benzene concentration (ug/L) Average TPH-G concentration (ug/L) <br /> 1990 <242> <370> <br /> 1991 <144> <710> <br /> I1992 <25> <175> <br /> 1993 ND ND <br /> 1994 ND <20> <br /> 1995 ND ND <br /> 1996 ND ND <br /> 1997* ND ND <br /> 1998 ND ND <br /> *Sample results obtained on 12/10/1997 were not InLluded in the average result-,since those samples were cross <br /> contaminated with submersible pump operatiow, <br /> MWIO, located in the UST area of the site, contained free product until November 1992, and has <br /> not exceeded the primary MCLS for Benzene since December 1996 <br /> 12 <br />