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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( ) Well Elevation to Water Elevation Thickness Ethyl- Numbel Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW5 09/13/88 958 2533 -1575 000 4 4 650 50 110 1,400 -- MW5 11/16/88 958 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 -1714 000 <0 5 14 24 46 790 -- MW5 08/17/89 9 58 2844 -1886 000 10 29 13 12 1,200 -- M1V5 12/19/89 958 2945 -1987 000 -- -- -- __ MW5 9 58 Well dry since 03/21/90 NIW5 12/30/93 958 2990 -2032 000 MWS 02/17/94 9 58 29 54 -1996 000 MW5 05/10/94 958 29 13 -1955 000 MW5 08/02/94 958 Well dry NIW5 11/01/94 958 Well dry MW5 02/17/95 958 2841 -1883 000 -- -- __ __ -- _ MW5 05/11/95 958 2572 -16 14 000 14 1 2 7 5 4 8 350 NIW5 08/24/95 958 2335 -1377 000 <0 5 <0 5 072 1 5 85 -- NIW5 10/19/95 958 2720 -1762 000 <0 5 <0 5 1 1 1 1 85 <2 5 MW5 02/13/96 958 Well dry -- -- __ __ __ -- NIW5 - NIW5 04/18/96 9 58 2200 -1242 0 00 <0 5 <0 5 <0 5 0 68 65 <2 5 NIW5 08/08/96 9 58 2422 -1464 0 00 -- __ __ __ __ -- NIW5 11/04/96 958 2468 -15 10 000 -- -- -- __ __ -- NIW5 _MW5 02/03/97 958 1989 -10 31 000 <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 8 63 2019 -1156 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 NIW5 11/11/97 8 63 Well dry -- __ __ __ __ -- NIW5 03/03/98 863 1612 -749 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 NIIW5 03/03/98 863 <2 0* MW5 05/20/98 863 1560 -697 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 05/20/98 863 <2 0* MW5 08/19/98 863 1745 -882 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW5 08/19/98 863 <2 0* MW5 11/18/98 863 1798 -935 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 NiWS 03/30/99 863 -- -- __ __ __ 6 tiprojects1739421masterlwpNq 126313942gw As Page l l of 51