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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( L) tLr�11 Elevation to Water Elevation Thickness Ethyl- Number Date _ _ (feet) (feet) (feet) (feet) Benzene - Toluene benzene _Xylenes TPH-g MTBE I MW4 09/17/03 712 114* MW4 12/08/03 7 12 1928 -12 16 000 1 70 <0 5 <0 5 <0 5 444 h 126 MW4 12/08/03 712 130* MW4 03/02/03 7 12 1778 -1066 000 220 <0 5 <0 5 <0 5 354 h 100 MW4 03102/04 7 12 $4 2* MW5 07/16/87 958 1669 -7 11 000 <10 480 280 1,390 2,200 -- MW5 04/11/88 958 2286 -1328 000 <2 0 25 25 85 500 -- MW5 09/13/88 958 2533 -1575 000 4 4 650 50 110 1,400 -- MW5 11/16/88 9 58 2531 -1573 000 <1 3 19 25 24 910 MW5 02/09/89 958 2509 -1551 000 3 4 12 15 22 1,250 MW5 05/31/89 958 2672 -17 14 000 <0 5 14 24 46 790 -- MW5 08/17/89 958 2844 -1886 000 1 0 29 13 12 1,200 MW5 12/19/89 9 58 2945 -19 87 000 -- -- __ __ MW5 9 58 Well dry since 03/21/90 MW5 12/30/93 9 58 2990 -2032 000 MW5 02/17/94 9 58 2954 -1996 000 MW5 05/10/94 9 58 2913 -1955 000 MW5 08/02/94 9 58 Well dry MWS 11/01/94 9 58 Well dry MW5 02/17/95 958 28 41 -18 83 000 -- -- __ __ MWS 05/11/95 958 2572 -1614 000 14 12 7 5 4 8 350 -- MW5 08/24/95 9 58 2335 -1377 0 00 <0 5 <0 5 072 15 85 -- M W 5 10/19/95 958 2720 -1762 0 00 <0 5 <0 5 1 1 1 1 85 <2 5 MW5 02/13/96 958 Well dry -- __ __ MW5 04/18/96 958 2200 -1242 0 00 <0 5 <0 5 <0 5 068 65 <2 5 MW5 08/08/96 958 2422 -1464 000 -- -- __ -- MW5 11/04/96 958 2468 -15 10 0 00 -- -- __ __ MW5 02/03/97 9 58 1989 -1031 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 05/08/97 863 1943 -1080 000 <0 5 <0 5 <0 5 <0 5 56 <2 5 MW5 08/26/97 863 20 19 -1156 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 11/11/97 863 Well dry -- __ __ __ _- 4projecrs173942Masterlwp1go304%3942gw x1s Page 11 of 52