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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 (u /L) <br /> Well Elevation to Water Elevation Thickness Ethyl El <br /> - <br /> No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> P 1 03/30/99 643 -- -- -- -- -- -- -- -- -- <br /> 05/05/99 1437 -794 000 <br /> 08/20/99 -- -- <br /> 12/06/99 <br /> 02/29/00 -- -- -- -- -- -- -- -- -_ <br /> 05/16/00 -- -- -- -- -- -- -- <br /> 09/11/00 <br /> 12/13/00 -- -- __ -- -- -- -- -- <br /> P2 01/30/91 7 87 3022 -2235 000 -- __ __ -_ <br /> 05/02/91 30 13 -2226 000 140 13 650 610 5,400 -- <br /> 07/16-17191 3105 -23 18 000 61 <5 300 220 5,200 -- <br /> 10/15/91 3164 -2377 000 20 82 90 63 1,500 -- <br /> 01/28/92 2993 -2206 000 53 24 170 120 2,900 <br /> 04/30/92 2951 -2164 000 52 <2 5 160 120 2,000 -- <br /> 08/13/92 3153 -23 66 000 45 12 100 76 2,100 -- <br /> 10/08/92 32 17 -2430 000 34 20 60 80 2,000 -- <br /> 02/23/93 2879 -2092 000 58 3 0 44 34 1,000 -- <br /> 05/18/93 2739 -1952 000 65 20 81 58 1,400 -- <br /> 08/22/93 2763 -1976 000 50 2 4 69 53 1,400 -- <br /> 12/30/93 2729 -1942 000 160 45 180 105 42,000 -- <br /> 02/17/94 2697 -19 10 000 5 7 2 8 17 14 270 -- <br /> 05/10/94 2663 -1876 000 24 <0 5 92 69 1,500 -- <br /> 08/02/94 2808 -2021 000 35 5 0 96 82 1,800 -- <br /> 11/01/94 28 43 -2056 000 18 <0 5 76 66 1,400 -- <br /> 02/17/95 2571 -17 84 000 -- -- -- -- __ <br /> 05/11/95 23 00 -15 13 000 20 <5 0 58 40 1,400 -- <br /> f 1pro3ec 039421masleAwp\g 1200\3942gw xls Page 25 of43 <br />