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TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942,4444 N PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration(µg/L,) <br /> Well Flevation to Water Elevation Thickness Ethyl- <br /> N. 0 <br /> thyl-yo Date (ft ms]) (ft) (ft msl) (ft) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW5 02/03/97 958 1989 -1031 000 <05 <05 <05 <05 <50 <25 <br /> 05/08/97 8 63 1943 -1080 000 <0 5 <0 5 <0 5 <0 5 56 <2 5 <br /> 08/26/97 20 19 -1156 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> l 1/1 1197 Well dry -- -- -- -- -- -- <br /> 03103198 16 12 -749 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 03/03/98 <2 0* <br /> 05/20/98 15 60 -697 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 05/20/98 <2 0* <br /> 08/19/98 1745 -8 82 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 08/19/98 <2 0* <br /> 11/18/98 1798 -935 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 03/30/99 -- -- -- -- -- -- <br /> 05/05/99 1641 -778 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 <br /> 08/20/99 17 87 -924 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 12/06/99 18 16 -9 53 000 <1 <1 <1 <1 <50 <1 <br /> 02/29/00 15 59 -6 96 000 <1 <1 <1 <1 <50 <1 <br /> 05/16/00 15 66 -7 03 0.00 <1 <1 <1 <1 <50 <1 <br /> MW6 07/16/87 892 1935 -1043 000 3,100 4,300 1,200 6,600 12,000 -- <br /> 04/11/88 2304 -13 67 062 Not sampled-LPH <br /> 09/13/88 25 12 -1620 000 19,000 17,000 2,300 12,000 65,000 -- <br /> 11/16/88 25 51 -1658 0 01 19,000 19,000 3,000 12,000 83,000 -- <br /> 02/09/89 2485 -15 93 Sheen Not sampled-LPH <br /> 05/31/89 2657 -1765 000 20,000 33,000 3,100 23,000 120,000 -- <br /> 08/17/89 2836 -1944 000 16,000 15,000 2,900 19,000 98,000 -- <br /> 12/19/89 28 80 -1988 000 -- -- -- -- -- <br /> Well dry since 03/21/90 <br /> 05/11/95 25 13 -1621 000 48 25 19 56 720 -- <br /> 08/24/95 2649 -1757 000 -- -- -- -- -- <br /> 10119/95 Well dry -- -- -- -- -- -- <br /> I hrnlut 7�')l?loii rubs IQSp{)1,912 + \I+ Page 9of37 <br />