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i • • <br /> TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCK-TON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration {pg/L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet ms]) (feet) (feet MSI) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> IWl 11/11/97 690 1985 -12 95 000 30 <10 160 130 2,200 <50 <br /> 03/03/98 690 1411 -721 000 21 <5 0 220 170 2,900 <25 <br /> 03/03/98 690 <5 9* <br /> 05/20/98 690 14 15 -725 000 17 <10 160 93 2,600 <50 <br /> 05/20/98 690 <2 0* <br /> 08/19/98 690 1566 -876 000 12 <2 5 120 79 1,600 28 <br /> 08/19/98 690 <4 0* <br /> 11/18/98 690 1602 -912 000 16 <5 0 78 40 1,300 26 <br /> 03/30/99 690 -- -- -_ -- -- -- -- -- <br /> 05/05/99 690 1452 -762 000 1 56 <1 0 148 725 2,170 106 <br /> 08/20/99 690 1600 -910 000 <br /> 12/06/99 690 1622 -932 000 <1 <1 19 8 5 420 1 9 <br /> 02/29/00 690 13 73 -683 000 <1 <1 <1 <1 68 <1 <br /> 05/16/00 690 13 82 -692 000 7 6 <1 16 <1 490 2 4 <br /> 09/11/00 690 16 15 -925 000 051 <0 5 096 <0 5 590 <0 5 <br /> 12/13/00 690 1600 -9 10 000 <0 5 <0 5 <0 5 192 690 <0 5 <br /> 03/08/01 690 15 13 -823 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 <br /> 06/21/01 690 1651 -9.61 000 <0 5 <0 5 1.5 0.6 800 5 7 <br /> 06/21/01 690 <5* <br /> MWI 01/87 776 -- -- -- <1 <1 -- <1 <50 -- <br /> 07/16/87 776 -- -- -- <0 5 15 <0 5 <0 50 <100 -- <br /> 04/11/88 776 2051 -1275 000 <0 5 <0 5 <0 5 <0 5 <100 -- <br /> 09/13/88 776 22 18 -1442 000 19 2 5 <0 5 <0 5 70 -- <br /> 11/16/88 776 2307 -15 31 000 <0 5 9 5 <0 5 <0 5 130 -- <br /> 02/09/89 776 2264 -1488 000 17 0 2 0 2 0 6 <250 -- <br /> 05/31/89 776 2926 -2150 000 <0 5 <0 5 <0 5 0 8 <250 <br /> d�proje us1739421niasterlwp\g6OIU94?gw sls Page 2 or 46 <br />