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TPH-g and benzene concentrations have attenuated to non detectable levels to MW6, located <br /> north of the UST area of the site TPH-g and benzene levels have consistently remained at less <br /> than detectable levels since 1993 <br /> IYearly Average Benzene and TPH-g Concentrations from MW6 <br /> Year Average benzene concentration(ag/L) Average TPH-G concentration(gg/L) <br /> 1990 <2UUU> <463> <br /> 1991 <968> <545> <br /> I992 N 3> ND <br /> I1993 ND ND <br /> 1994 ND ND <br /> I1995 ND ND <br /> 1996 ND ND <br /> I1997* ND ND <br /> 1998 ND ND <br /> *Sample results obtained on 12/16/1997 were not included m the average results since those samples were cross <br /> contaminated with submersible pump operations <br /> ITPH-g and benzene remain at non detectable levels to 1\4W-7 located south of the site <br /> I <br /> 10 <br />