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• A 8 � <br /> MTBE TBA Concentration Variation With Time in Groundwater, Well MW-7 <br /> Station No 835 <br /> 100000 2705 Country Club Boulevard, Stockton, California __ 0 <br /> -�MTBE — -TBA Groundwater r <br /> 10000 TPHG concentration below lab detection limit -2 <br /> value Samples were not analyzed for MTBE <br /> until the fast quarter of 1996 <br /> 1000 `4 <br /> ^, E <br /> a <br /> Y � <br /> 100 <br /> V / I 0 <br /> ! t <br /> V J <br /> 10 -8 <br /> 1 -10 <br /> Samples were not analyzed for TBA until the last quarter of <br /> 1997,the detection limit values for TBA are unknown pnor <br /> to 2002 <br /> 0 1 -12 <br /> 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 <br /> Year <br />