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I ABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration (p�/L _ <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW4 02/23/93 8 13 29 12 -2099 000 <br /> 08/22/93 28 04 -1991 000 <br /> 12/30/93 27 85 -1972 000 <br /> 02/17/94 2749 -1936 000 <br /> 05/10/94 27 17 -1904 000 <br /> 08/02/94 28 63 -2050 000 <br /> 11/01/94 2898 -2085 000 -- -- -- -_ <br /> 02/17/95 2641 -1828 000 6 4 <0 5 3 2 3 4 880 -- <br /> 05/11/95 23 84 -15 71 000 91 <1 0 87 2 9 520 -- <br /> 08/24/95 2522 -1709 000 28 20 35 7 2 870 -- <br /> 10/19/95 25 70 -1757 000 19 <5 0 18 6 0 1,000 <25 <br /> 02/13/96 2348 -1535 000 4 4 <1 0 12 1 1 750 -- <br /> 04/18/96 21 17 -1304 000 10 <1 0 12 10 430 <5 0 <br /> 08/08/96 2241 -1428 000 4 4 <0 5 5 2 <0 50 450 7 4 <br /> 11/04/96 2280 -1467 000 <0 5 <0 5 5 3 <0 5 730 15 <br /> 02/03/97 1832 -10 19 000 9 3 <2 0 11 3 5 1,400 17 <br /> 05/08/97 7 18 1792 -10 74 000 13 0 83 3 5 <0 5 780 10 <br /> 08/26/97 1971 -1253 000 7 6 <1 0 <1 0 <1 0 440 c 12 <br /> 11/11/97 2022 -13 04 000 <2 0 <2 0 <2 0 <2 0 720 c <10 <br /> 03/03/98 1457 -739 000 8 9 0 80 058 <0 5 640 13 <br /> 03/03/98 6 0* <br /> 05/20/98 1455 -737 000 15 <5 0 35 9 1 1,I00 <25 <br /> 05/20/98 65* <br /> 08/19/98 1606 -888 000 1 1 16 4 3 <0 5 680 <2 5 <br /> 08/19/98 7 7* <br /> 11/18/98 1640 -922 000 <0 5 14 5 4 <0 5 770 c 15 <br /> 05/05/99 1490 -772 000 <0 5 <0 5 1 14 <0 5 542 72 <br /> 1 Iprgecls1739421masterlnp1g3O[13942gw Nis Page 8 of 41 <br />