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TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration(µg/L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet ms]) (feet) (feet ms!) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW3 05/08/97 854 1942 -1088 000 <br /> 08/26/97 2120 -1266 000 <br /> 11/11/97 Well dry __ __ __ __ __ __ <br /> 03/03/98 16 16 -7 62 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 03/03/98 <2 0* <br /> 05/20/98 1602 -748 000 14 <0 5 <0 5 <0 5 170 <2 5 <br /> 05/20/98 <2 0* <br /> 08/19/98 1748 -894 000 5 9 2 2 <0 5 0 63 280 2 6 <br /> 08/19/98 <2 0* <br /> 11/18/98 1793 -939 0 00 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 03/30/99 -- -- -- -- -- -- <br /> 05/05/99 1640 -7 86 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 <br /> 08/20/99 1785 -931 0 00 -- -- -- __ __ _- <br /> 12/06/99 18 02 -948 000 <br /> 02/29/00 15 67 -7 13 000 <br /> 05/16/00 1562 -7 08 0 00 -- -- -- __ __ -- <br /> 09/11/00 1798 -944 000 73 8 4 5 9 11 5 220 <0 5 <br /> MW4 07/16187 8 13 18 15 -1002 000 1,100 <50 850 1,750 4,900 -- <br /> 04/11/88 21 23 -13 10 000 510 <25 490 1,100 8,500 -- <br /> 09/13/88 23 66 -15 53 000 860 40 670 2,400 5,600 -- <br /> 11/16/88 23 81 -1568 000 860 340 810 1,000 8,000 -- <br /> 02/09/89 23 55 -1542 0 00 630 20 530 650 4,800 -- <br /> 05/31/89 2501 -1688 000 790 35 720 1,300 6,000 -- <br /> 08/17/89 2650 -1837 000 1,000 45 940 1,100 8,100 -- <br /> 12/19/89 2757 -1944 0 00 190 2,800 1,100 380 7,900 -- <br /> 03/21/90 28 06 -1993 0 00 400 6 8 340 160 3,200 -- <br /> 05/17/90 28 87 -2074 000 300 40 150 93 3,500 -- <br /> 01/28/92 Dry -- __ __ __ _- <br /> 04/30/92 2953 -2140 0 00 <br /> 08/13192 Dry -- -- -- __ __ -- <br /> t Ipro3ec.ts4739421maslehwp%g9ODL3442bw xis Pabe 6 of 37 <br />