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I early Average Benzene and TPH-g Conlentratton$from NIW4 <br /> Iear Average benzene concentration(ugfL) Average TPH-G concentration (gg/L) <br /> 1990 <1 68o> <2 500> <br /> 1991 <1,220> <br /> <2,375> <br /> ' 1992 <20> <100> <br /> 1993 ND ND <br /> ' <br /> 1994 ND <br /> ND <br /> 1995 ND ND <br /> 1 1996 ND <br /> ND <br />' 1997* ND <br /> ND <br /> 1998 Nn ND <br />' *Sample results obtained on 12/16/1997 were not m(luded m the average results since those samples were cross <br /> wntammatW with submersible pump opLratrons <br /> MWS, located off-site, south of the Kragen Auto property, contains no detectable levels of <br /> TPH- nor benzene <br /> Yearly Average Benzene and TPH-g Concentrations from MW5 <br /> Year Average benzene concentration(kg/L) Average TPH-G concentration(ugg1L) <br /> 1990 ND <0 6> <br /> 1991 ND <br /> ND <br /> 1992 ND <br /> NU <br /> 1993 ND <br /> ND <br /> 1994 ND <br /> ND <br /> 1995 ND <br /> ND <br /> 1996 ND ND <br /> 1997* ND <br /> ND <br /> 1998 ND ND <br /> *Sample results obtained on 12/16/1997 were not included in the,average result~duce those samples were cross <br /> contani mated with submei,ible pump operations <br /> 9 <br />