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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 msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW2 05/05/99 749 1520 -771 000 -- -- _- __ __ <br /> 08/20/99 1668 -919 000 101 456 808 242 253 681 <br /> 12/06/99 1688 -939 000 <1 <1 <1 <1 52 <1 <br /> 02/29/00 1442 -693 000 <1 <1 <1 <1 <50 <1 <br /> 05/16/00 1445 -696 000 <1 <1 <1 <1 <50 <1 <br /> 09/11/00 1682 -933 0 00 <0 5 <0 5 <0 5 <0 5 <50 <0 5 <br /> MW3 01/87 914 -- -- -- 17 640 -- 400 32,000 -- <br /> 07/16/87 1926 -10 12 0 00 830 600 190 436 1,700 -- <br /> 04/11/88 2243 -1329 0 00 450 970 210 860 4,600 -- <br /> 09/13/88 2495 -1578 0 04 Not sampled- LPH <br /> 11/16/88 2327 -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 28 51 -1929 0 11 Not sampled- LPH <br /> Well dry since 05/17/90 <br /> 02/17/94 2892 -1978 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 25 59 -1645 000 97 24 42 1,300 5,600 -- <br /> 08/24/95 2449 -1535 000 45 5 9 19 440 2,600 -- <br /> I0/19/95 Well dry -- __ -- __ <br /> 02/13/96 2529 -16 15 000 270 68 81 210 2,200 -- <br /> 04/18/96 1940 -1026 0 00 80 9 5 25 45 1,000 17 <br /> 08/08/96 2405 -1491 0 00 -- -- __ __ <br /> 11/04/96 2405 -1491 0 00 -- -- __ _- __ -- <br /> 02/03)97 19 63 -1049 0 00 180 4 6 48 110 1,400 24 <br /> fipio7ecis573942Undsier5wplg9ODU942b%v xls Pabe 5 of 37 <br />