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TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON, CALIFORNIA Casing Depth Groundwater LPH Concentration( /L) Well Elevation to Water Elevation Thickness Ethyl- No Date (feet msl) (feet) (feet rnsl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW2 05/05/99 749 1520 -771 000 -- -- __ __ 08/20/99 749 1668 -9 19 000 101 456 808 242 253 681 12/06/99 749 1688 -939 000 <1 02/29/00 749 1442 -693 000 <1 <1 <1 <1 <50 <1 05/16/00 749 1445 -696 000 <1 <1 <1 09/11/00 749 1682 -933 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 12/13/00 749 1667 -918 000 2 6 1 5 9 69 <0 5 03/08/01 749 15 81 -832 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 06/21/0I 749 1715 -966 000 <0 5 <0 5 <0 5 <0 5 81 12 06/21/01 749 <5* MW3 01/87 914 -- -- -- 17 640 -- 400 32,000 -- 07/16/87 9 14 1926 -10 12 000 830 600 190 436 1,700 -- 04/11/88 914 2243 -1329 000 450 970 210 860 4,600 -- 09/13/88 9 14 2495 -1578 0 04 Not sampled- LPH 11/16/88 9 14 2327 -14 13 000 <250 3,200 1,900 8,600 61,000 -- 02/09/89 9 14 25 41 -1627 Sheen Not sampled- LPH 05/31/89 9 14 2643 -17 18 0 15 Not sampled- LPH 08/17/89 9 14 28 12 -1877 0 15 Not sampled- LPH 12/19/89 9 14 2849 -1926 0 13 Not sampled- LPH 03/21/90 9 14 2851 -1929 0 11 Not sampled- LPH 9 14 Well dry since 05/17/90 02/17/94 9 14 2892 -1978 000 05/10/94 9 14 29 14 -2000 000 -- -- -- -- -- -- 08/02/94 9 14 Well dry -- -- -- -- --11/01/94 9 14 Well dry -- -- -- -- -- 02/17/95 9 14 Well dry -- -- -- -- -- 05/11/95 9 14 2559 -1645 000 97 24 42 1,300 5,600 -- 08/24/95 9 14 2449 -15 35 000 45 5 9 19 440 2,600 -- 10/19/95 9 14 Well dry -- -- -- -- -- 02/13/96 9 14 2529 -16 15 000 270 68 81 210 2,200 -- 04/18/96 9 14 1940 -1026 000 80 9 5 25 45 1,000 17 08108/96 914 2405 -14 91 000 -- -- -- -- -- -- a 1projec 1\73942111]astLr\wplg60113942gw xis Page 5 of 37