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1 <br /> I early Average Benzene and TPH-g Concentrations from MW 10 <br /> Year Average benzene concentration (ug/L) Average TPH-G concentration (,ug/L) <br /> 1990 <39,700> <58 300> <br /> 1991 H, FP <br /> 1992 Dry Well My Well <br /> 1993 <276> <28,500> <br /> 1994 <18> <42,750> <br /> 1995 <6> <14 575> <br />' 1996 <2> <2 157> <br /> 1997* ND <970> <br /> 1998 ND <445> <br /> *Sample results obtained on 12/16/1997 were not imluded in the average results since those samples were cross <br /> wfitaminated with.ubuner.ible pinup operation. <br /> TPH-g and the all aromatic constituents, benzene, toluene, ethylbenzene and xylene have not been <br /> identified at detectable levels since monitoring was initiated to N Wl 1, down gradient of MW8, in <br /> 1992 <br /> IYearly Average Benzene and TPH-g Concentrations from MW 11 <br /> Year Average benzene concentration(deg/L) Average TPH-G concentration(ug/L) <br /> 1990 ND ND <br /> 1991 ND ND <br /> 1992 ND ND <br /> 1993 ND ND <br /> 1994 ND ND <br /> 1995 ND ND <br /> 1996 ND ND <br /> 1997* ND ND <br /> 1998 ND ND <br /> 13 <br />