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�i �j �� 1� • • s 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 MW3 04/11/88 9 14 2243 -1329 000 450 970 210 860 4,600 -- MW3 09/13/88 914 2495 -1578 004 Not sampled- LPH MW3 11/16/88 9 14 23 27 -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 18 015 Not sampled- LPH MW3 08/17/89 9 14 28 12 -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 914 Well dry since 05/17/90 MW3 02/17/94 9 14 28 92 -1978 000 MW3 05/10/94 914 29 14 -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 -16 15 0 00 270 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 24 05 -1491 000 -- -- __ _- MW3 02/03/97 9 14 1963 -1049 000 180 4 6 48 110 1,400 24 MW3 05/08/97 854 1942 -1088 000 -- -- __ -_ MW3 08/26/97 854 21 20 -1266 000 MW3 11/11/97 854 Well dry -- _- _- __ __ -- MW3 03/03/98 854 16 16 -762 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW3 03/03/98 854 <2 0* MW3 05/20/98 854 1602 -748 000 14 <0 5 <0 5 <0 5 170 <2 5 MW3 05/20/98 854 <2 0* MW3 08/19/98 854 1748 -894 000 5 9 2 2 <0 5 063 280 2 6 MW3 08/19/98 854 <2 0* MW3 11/18/98 854 1793 -939 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 g lprojects1739421master\wplg060213942gw xIs Page 6 of 43