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• i TABLE 2 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- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE MW2 12/08/03 7 15 1935 -1220 000 1 70 <0 5 <0 5 <0 5 127 h 0 8 MW2 12/08/03 7 15 <0 5* MW2 03/02/04 715 1784 -1069 000 250 <0 5 <0 5 <0 5 115 h 1 5 MW2 03/02/04 7 15 <0 5* MW2 06/28/04 715 1903 -1188 000 -- MW2 j 06/29/04 7 15 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 h <0 5* MW2 09/27/04 7 15 1970 -12 55 000 -- MW2 1 09/28/04 7 15 -- -- -- <0 5 <0 5 <0 5 <0 5 217 h <0 5* MW2 12/01/04 715 1934 -1219 000 — MW2 1 12/02/04 715 — — -- 150 <0 5 <0 5 <0 5 133 h <0 5* MW3 01/87 914 -- -- -- 17 640 -- 400 32,000 MW3 07/16/87 9 14 1926 -1012 000 830 600 190 436 1,700 MW3 04/11/88 9 14 2243 -1329 0 00 450 970 210 860 4,600 -- MW3 09/13/88 9 14 24 95 -1578 0 04 Not sampled- LPH MW3 11/16/88 9 14 2327 -1413 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 013 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 28 92 -1978 000 MW3 05/10/94 9 14 29 14 -2000 000 MW3 08/02/94 914 Well dry -- MW3 11/01/94 9 I4 Well dry -- -- -- -- -- W3 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 10/19/95 914 Well dry MW3 02/13/96 9 14 2529 -16 15 000 270 68 81 210 2,200 -- MW3 04/18/96 9 14 1940 -1026 000 80 95 25 45 1,000 17 S\projects1739421masterlwplq I20413942gw xls Page 7 of 59