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■� �� wr www �ll� �� i� �� J� � � � !� � 1♦ TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(ufl _ Well Elevation to Water Elevation Thickness Ethyl- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE I 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 000 450 970 210 860 4,600 MW3 09/13/88 9 14 2495 -1578 004 Not sampled- LPH MW3 11/16/88 9 14 23 27 -14 l3 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 -1718 0 15 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 0 I 1 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 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 25 59 -1645 000 97 24 42 1,300 5,600 -- MW3 08/24/95 9 14 2449 -1535 000 45 59 19 440 2,600 -- MW3 10/19/95 9 14 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 9 5 25 45 1,000 17 MW3 08/08/96 9 14 24 05 -1491 000 -- __ __ __ MW3 11/04/96 9 14 2405 -1491 000 -- -- -- MW3 02/03/97 914 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 1616 -762 0 00 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW3 03/03/98 854 <2 0* MW3 05/20/98 8 54 1602 -748 000 14 <0 5 <0 5 <0 5 170 <2 5 MW3 05/20/98 854 <2 0* 9 lP,-Jects173942U.asterlwp1g0704\3942gw As Page 7 of 54