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• FS9 <br /> TPHG, MTBE, TBA Concentration Variation With Time in Groundwater, Well MW-8 <br /> Station No 836 <br /> 2705 Country Club Boulevard, Stockton, Califomia <br /> 1000 ---- ---- - --- -- a <br /> --* MTBE - ---TPHG <br /> - -TBA — —Goundwater <br /> -2 <br /> Samples were not analyzed for MTBE until the last <br /> quarter of 1996 <br /> 100 -4 <br /> ... -6 E <br /> l -8 <br /> 10 - 0 <br /> tj -10 <br /> 1 Samples were not analyzed for TBA until the last quarter of -12 <br /> 1997,the detection limit values for TBA are unknown prior <br /> / to 2002 <br /> -14 <br /> 01 -16 <br /> 1992 1994 1996 1998 2000 2002 2004 2006 <br /> Year <br /> i <br />