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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(}tg/L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (ft nlsl) (ft) (ft msl) (ft) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> 1 W l 05/20/98 690 14 15 -725 000 17 <10 160 93 2,600 <50 <br /> 05/20/98 <2 0* <br /> 08/19/98 15 66 -8 76 000 12 <2 5 120 79 1,600 28 <br /> 08/19/98 <4 0* <br /> 11/18/98 1602 -9 12 000 16 <5 0 78 40 1,300 26 <br /> 03/30/99 -- -- -- -- -- -- -- -- -- <br /> 05/05/99 1452 -7 62 000 1 56 <1 0 148 725 2,170 10 6 <br /> 08/20/99 1600 -9 10 000 -- -- -- -- -- -- <br /> 12/06/99 1622 -932 000 <1 <1 19 8 5 420 19 <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 1.6 <1 490 2.4 <br /> MW I 01187 776 -- -- -- <1 <1 -- <1 <50 -- <br /> 07/16/87 1744 -968 132 <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 1 9 2 5 <0 5 <0 5 70 -- <br /> 11/16/88 23 07 -15 31 000 <0 5 9 5 <0 5 <0 5 130 -- <br /> 02/09/89 22 64 -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 2824 -2048 000 <0 5 4 5 <0 5 <0 5 120 -- <br /> 09/25/90 2959 -21 83 000 <0 5 7 0 1 0 4 7 170 12/19/90 Dry -- -- -- -- -- <br /> 01/30/91 Dry -- -- -- -- -- -- <br /> 05/02/91 Dry -- -- -- -- --07/16-17/91 Dry -- -- -- -- -- -- <br /> 10/15/91 2995 -22 19 a 000 -- -- -- -- -- -- <br /> 01128192 29 70 -2194 a 000 -- -- -- -- -- -- <br /> I Iprojects173942lmaster\ttp1Q50013942gu xls Page 2 of 37 <br />