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FigN 7 <br /> TPHG, MTBE, TBA Concentration Variation With Time in Groundwater, Well MW-4 <br /> Station No 835 <br /> 2705 Country Club Boulevard, Stockton, California <br /> 10000 - — -- — — - - 0 <br /> —TPHG MTBE <br /> —�--TBA Groundwater _2 <br /> TPHG was consistently below the detection limit value <br /> 1000 between 1993 and 2002 Samples were not analyzed <br /> for MTBE until the last quarter of 1996 , -4 <br /> E <br /> -6 a <br /> m <br /> 100 <br /> CC <br /> 0 C <br /> v 10 3 <br /> -12 <br /> -14 <br /> 1 <br /> Samples were not analyzed for TBA until the last quarter of -16 <br /> 1997, the detection limit values for TBA are unknown prior <br /> to 2002 <br /> 01 -18 <br /> 1991 1993 1995 1997 1999 2001 2003 2005 <br /> year <br /> i <br />