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TABLE I 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 TPR-g MTBE <br /> IWI 11/11/97 690 1985 -1295 000 30 <10 160 130 2,200 <50 <br /> 03/03/98 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 <br /> <4 0* <br /> 11/18/98 1602 -912 000 16 <5 0 78 40 1,300 26 <br /> 03/30/99 -- -- <br /> 05/05/99 1452 -762 000 1 56 <1 0 148 725 2,170 106 <br /> 08/20/99 1600 -910 000 -- -_ -- <br /> 12/06/99 1622 -932 000 <1 <1 19 8 5 420 1 9 <br /> 02/29/00 13 73 -6 83 000 <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 -9 25 000 051 <0 5 096 <0 5 590 <0 5 <br /> 12/13/00 1600 -910 000 <0 5 <0 S <0 5 192 690 <0 5 <br /> MWl 01/87 776 -- -- -- <1 <1 -- <1 <50 -- <br /> 07/16/87 -- -- -- <0 5 15 <0 5 <0 50 <100 -- <br /> 04/11/88 2051 -12 75 000 <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 -1531 000 <05 95 <05 <05 130 -- <br /> 02/09/89 22 64 -1488 000 17 0 2 0 2 0 6 <250 -- <br /> 05/31/89 2926 -21 50 000 <0 5 <0 5 <0 5 0 8 <250 <br /> 08/17/89 2587 -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 /> 03/21190 2746 -1970 000 <0 5 <0 5 0 8 2 9 80 -- <br /> 15pro3ects173942Unas1er\wp4g 12000942gw x1s Page 2 of 43 <br />