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1 <br /> 1 <br /> MM3 which contained free Product until November 1992 has not exceeded the primary MCLs for <br /> toluene, ethylbenzene and xylenes since March 1993 and the secondary MCLs for toluene since <br /> Se tember 1993 and for eth lbenzene since September 1995 <br />' Yearly Average Benzene and TPH-g Concentrations from INIM3 <br /> I ear Average benzene concentration(yg/L) Average TPH-G concentration(,Ug/L) <br />' 1990 Free phase product Free phase product <br /> 1991 1•ree phase product free phase product <br /> 1992 free phase product Free <br /> base product <br /> P <br /> 1993 <78 4> <6,875> <br /> 1994 <3 5> <5,675> <br /> 1995 <2 5> <2,525> <br /> 1996 <1 2> <1,038> <br />' 1997* <10> <843> <br /> 1998 <0 8> <460> <br /> *Sample retiuits ohtanned on 12/16/1997 were not included in the average;resiplls~ince those samples were;cross <br /> contaminated with submersible pump operations <br />' MW4, located on-site and south of the UST area, identified significant attenuation of TPH-g and <br /> benzene during that period 1990 to 1992 to non detectable levels in 1993 TPH-g and benzene <br />' have consistently remained at less than detectible levels from 1993 to present <br /> r <br /> r <br />