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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 ( /L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW4 08/20/99 718 1645 -927 000 140 151 <0 5 168 460 203 <br /> 12/06/99 1655 -937 000 <1 <1 18 4 7 330 89 <br /> 02/29/00 1412 -694 000 43 <1 <1 <1 100 7 <br /> 05/16/00 1414 -696 000 19 <1 <1 <1 190 6 9 <br /> 09/11/00 1649 -9 31 000 <0 5 <0 5 <0 5 <0 5 330 72 <br /> 12/13/00 1635 -9 17 000 <0 5 5 8 0 82 5 1 360 13 <br /> 12/13/00 10* <br /> 03/08/01 1549 -8.31 0.00 <0.5 <0.5 <0.5 <0.5 280 24 <br /> MW5 07/16/87 958 1669 -7 11 000 <10 480 280 1,390 2,200 -- <br /> 04/11/88 22 86 -13 28 000 <2 0 25 25 85 500 -- <br /> 09/13/88 25 33 -15 75 000 4 4 650 50 110 1,400 -- <br /> 11/16/88 2531 -15 73 000 <1 3 19 25 24 910 -- <br /> 02/09/89 25 09 -15 51 000 3 4 12 15 22 1,250 -- <br /> 05/31/89 2672 -17 14 000 <0 5 14 24 46 790 -- <br /> 08/17/89 2844 -18 86 000 10 29 13 12 1,200 -- <br /> 12/19/89 2945 -19 87 000 -- -- -- -- -- <br /> Well dry since 03/21/90 <br /> 12/30/93 2990 -2032 000 -- -- -- -- -- <br /> 02/17/94 2954 -1996 000 -- -- -- -- -- -- <br /> 05/10/94 2913 -1955 000 -- -- -- -- -- -- <br /> 08/02/94 Well dry <br /> 11/01/94 Well dry -- -- -- -- -- -- <br /> 02/17/95 2841 -1983 000 -- -- -- -- -- <br /> 05/11/95 2572 -1614 000 14 1 2 7 5 4 8 350 -- <br /> 08/24/95 23 35 -1377 000 <0 5 <0 5 072 15 85 -- <br /> 10/19/95 2720 -1762 000 <0 5 <0 5 1 1 1 1 85 <2 5 <br /> f Ipro3LCIs\739421ma5ter1wp4g30]U942gw AS Pap 9 of 4 S <br />