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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(µg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH- MTBE MW2 03/02/04 7 15 <0 5' MW2 06/28/04 7 15 1903 -1188 000 -- -- -- -- -- -- MW2 06/29/04 7 15 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 h <0 5* MW2 09/27/04 715 1970 -1255 000 — — — _ -- MW2 09/28/04 715 -- -- -- <0.5 <0 5 <0 5 <0 5 217 h <0 5* MW3 01/87 914 -- -- -- 17 640 -- 400 32,000 -- MW3 07/16/87 9 14 0 26 -1012 0 00 830 600 190 436 1,700 -- MW3 04/11/88 9 14 2243 -13 29 000 450 970 210 860 4,600 -- MW3 09/13/88 9 14 2495 -1578 0 04 Not sampled- LPH MW3 11/16/88 9 14 2327 -14 13 000 <250 3,200 1,900 8,600 61,000 -- MW3 02/09/89 9 14 2541 -1627 Sheen Not sampled- LPH MW3 05/31/89 9 14 2643 -17 18 0 15 Not sampled- LPH MW3 08/17/89 9 l4 2812 -1877 0 15 Not sampled- LPH MW3 12/19/89 9 14 2849 -1926 0 13 Not sampled- LPH MW3 03/21/90 9 14 2851 -1929 Oil Not sampled- LPH MW3 9 14 Well dry since 05/17/90 MW3 02/17/94 9 14 2892 -1978 000 -- -- -- -- __ -- MW3 05/10/94 9 14 2914 -2000 000 -- -- -- -- -- -- MW3 08/02/94 9 14 Well dry MW3 11/01/94 9 14 Well dry -- -- -- -- -- MW3 02/17/95 9 14 Well dry -- -- -- -- -- MW3 05/11/95 9 14 2559 -1645 000 97 24 42 1,300 5,600 -- MW3 08/24/95 9 14 2449 -1535 000 45 5 9 19 440 2,600 -- MW3 10/19/95 9 14 Well dry -- -- -- -- -- MW3 02/13/96 9 14 2529 -1615 000 270 68 81 210 2,200 -- MW3 04/18/96 9 14 1940 -1026 000 80 9 5 25 45 1,000 17 MW3 08/08/96 9 14 2405 -1491 000 -- -- -- -- -- -- MW3 11/04/96 9 14 2405 -1491 000 -- -- -- -- -- -- MW3 02/03/97 9 14 1963 -1049 000 180 46 48 110 1,400 24 MW3 05/08/97 854 1942 -1088 000 -- -- -- -- -- -- MW3 08/26/97 854 2120 -1266 000 -- -- -- -- -- g 5projects%739421masterlwp\g0904U942gw As Page 7 of 56