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• TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA Casing Depth Groundwater LPH _ Concentration_(µg/L) Well Elevation to Water Elevation Thickness Ethyl- No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE I MW5 11/04/96 958 2468 -15 10 000 -- -_ __ -_ 02/03/97 958 1989 -1031 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 05/08/97 863 1943 -1080 000 <0 5 <0 5 <0 5 <0 5 56 <2 5 08/26/97 863 20 19 -1156 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 11/11/97 8 63 Well dry -- -- -- __ __ 03/03/98 8 63 1612 -749 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 03/03/98 8 63 <2 0* 05/20/98 8 63 1560 -697 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 05/20/98 8 63 <2 0* 08/19/98 8 63 1745 -8 82 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 08/19/98 8 63 <2 0* 11/18/98 8 63 1798 -935 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 03/30/99 863 -- -- -- -- -- -- -- -- -- 05/05/99 863 1641 -778 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 08/20/99 863 1787 -924 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 12/06/99 863 18 16 -953 000 <1 <1 <1 <1 <50 <1 02/29/00 863 1559 -696 000 <1 <1 <1 <1 <50 <1 05/16/00 863 1566 -7 03 000 <1 <1 <1 <1 <50 <1 09/11/00 8 63 1801 -938 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 12/13/00 8 63 1795 -932 000 <0 5 <0 5 <0 5 0 65 190 <0 5 03/08/01 863 17 12 -849 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 06/21/01 8 63 1846 -9 83 000 <0 5 <0 5 <0 5 064 <50 <0 5 MW6 07/16/87 8 92 1935 -1043 000 3,100 4,300 1,200 6,600 12,000 -- 04/11/88 892 2304 -1367 062 Not sampled-LPH 09/13/88 892 25 12 -1620 000 19,000 17,000 2,300 12,000 65,000 -- 11/16/88 892 2551 -1658 001 19,000 19,000 3,000 12,000 83,000 -- 02/09/89 892 2485 -1593 Sheen Not sampled-LPH 05/31/89 892 2657 -17 65 000 20,000 33,000 3,100 23,000 120,000 -- 08/17/89 892 2836 -1944 000 16,000 15,000 2,900 19,000 98,000 -- 12/19/89 892 28 80 -1988 000 -- -- -- -- -- 892 _892 Well dry since 03/21/90 05/11/95 892 25 13 -1621 000 48 25 19 56 720 -- 'projects1739421master\%%p%g66113942gw xls Page 9 of 37