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Yearly Average Benzene and TPH-g Concentrations from MW1 <br /> Year Average benzene concentration(,ug/L) Average TPH-G concentration (ug/L) <br /> 1990 Free phase product Free phase product <br /> 1991 Free phase product Free phase product <br />' 1992 Fiee phase pioduo Free phase product <br /> 1993 <2 8> <1178> <br /> 1994 ND <225> <br /> 1995 ND <400> <br /> 1996 <0 2> <43> <br />' 1997 ND* <47>* <br /> 1998 ND <br /> ND <br />' *Sample results obtained on 12/16/1997 were not included in the average results~ince lho.e sample~were cross <br /> contaminated with submersible pump operations <br /> MW2 identified a g9% attenuation of average benzene concentrations and a 64% attenuation of <br /> avera a TPH-g concentration between 1990 and 1998 <br /> Yearly Average Beniene and TPH-g Concentrations front IN W2 <br /> lea Average benzene concentration (Eig/L) Average TPH-G concentration(pg/L) <br />' 1990 <27,700> <49,000> <br /> 1991 <12,520> <38,000> <br /> 1992 <75,500> <11,475> <br /> 1993 <2,435> <53,000> <br /> 1994 <962> <21,950> <br /> 1995 <642> <15,800> <br /> 1996 <475> <14,400> <br /> E1997* <193> <10,730> <br /> 1998 <175> <17 500> <br /> *Sample results obtamcd on 12/16/1997 were,not included in the average Pc,sulk Since those,samples were cross <br /> contaminated with submersible pump operations <br /> 7 <br />