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TABLE t GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942, 4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration ( /L <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBF <br /> i <br /> ]W 1 03/03/98 690 1411 -721 000 21 <5 0 220 170 2,900 <25 <br /> 03/03/98 <5 9* <br /> 05/20/98 14 15 -725 000 17 <10 160 93 2,600 <50 <br /> 05/20/98 <2 0* <br /> 08/19/98 1566 -876 000 12 <2 5 120 79 1,600 28 <br /> 08/19/98 <4 0* <br /> 11/18/98 1602 -912 000 16 <5 0 78 40 1,300 26 <br /> 05/05/99 1452 -7 62 000 1 56 <1 0 148 725 2,170 10 6 <br /> 08/20/99 1600 -910 000 -- -- -- -- -- -- <br /> 12/06/99 1622 -932 000 <1 <1 19 85 420 19 <br /> 02/29/00 1373 -683 000 <1 <1 <1 <1 68 <1 <br /> 05/16/00 13 82 -692 000 7 6 <1 16 <1 490 2 4 <br /> 09/11/00 1615 -925 000 0 51 <0 5 096 <0 5 590 <0 5 <br /> 12/13/00 1600 -910 000 <0 5 <0 5 <0 5 192 690 <0 5 <br /> 03/08/01 15 13 -823 000 <0 5 <0 5 <0.5 <0 5 <50 <0 5 <br /> MW] 01187 776 -- -- -- <1 <1 -- <1 <50 -- <br /> 07/16/87 -- -- -- <0 5 15 <0 5 <0 50 <100 -- <br /> 04/11/88 2051 -1275 000 <0 5 <0 5 <0 5 <0 5 <100 -- <br /> 09/13/88 22 18 -1442 000 19 2 5 <0 5 <0 5 70 -- <br /> 11/16/88 2307 -15 31 000 <0 5 9 5 <0 5 <0 5 130 -- <br /> 02/09/89 2264 -1488 000 17 0 2 0 2 0 6 <250 -- <br /> 05/31/89 2926 -2150 000 <0 5 <0 5 <0 5 0 8 <250 -- <br /> 08/17/89 25 87 -18 11 000 <0 5 <0 5 <0 5 <0 5 <250 -- <br /> 12/19/89 2922 -2146 000 <0 5 19 <0 5 <0 5 <250 -- <br /> 03/21/90 2746 -1970 000 <0 5 <0 5 0 8 2 9 80 -- <br /> 05/17/90 28 24 -2048 000 <0 5 4 5 <0 5 <0 5 120 -- <br /> C1projects173942Vmasterlwp1g30113942gw xis Page 2 of41 <br />