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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 (pg/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 /> MW3 09/13/88 9 14 2495 -1578 004 Not sampled- LPH <br /> 11/16/88 23 27 -14 13 000 <250 3,200 1,900 8,600 61,000 -- <br /> 02/09/89 2541 -1627 Sheen Not sampled- LPH <br /> 05/31/89 2643 -17 18 0 15 Not sampled- LPH <br /> 08/17/89 28 12 -1877 0 15 Not sampled- LPH <br /> 12/19/89 2849 -1926 0 13 Not sampled- LPH <br /> 03/21/90 2851 -1929 Oil Not sampled- LPH <br /> Well dry since 05/17/90 <br /> 02/17/94 2892 -1979 000 <br /> 05/10/94 29 14 -2000 000 -- -- -- __ <br /> 08/02/94 Well dry <br /> 11/01/94 Well dry <br /> 02/17/95 Well dry <br /> 05/11/95 2559 -1645 000 97 24 42 1,300 5,600 -- <br /> 08/24/95 2449 -15 35 000 45 5 9 19 440 2,600 -- <br /> 10/19/95 Well dry <br /> 02/13/96 2529 -1615 000 270 68 81 210 2,200 -- <br /> 04/18/96 1940 -1026 000 80 95 25 45 1,000 17 <br /> 08/08/96 2405 -14 91 000 <br /> 11/04/96 2405 -1491 000 -- -- -- -- <br /> 02/03/97 1963 -1049 000 180 4 6 48 110 1,400 24 <br /> 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 /> f 1pi o3eclsti739421Unasierlu p1g301 L3942gw els Page 6 of 41 <br />