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TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942, 4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration( /L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW5 07/16/87 958 1669 -711 000 <10 480 280 1,390 2,200 -- <br /> 04/11/88 958 2286 -1328 000 <2 0 25 25 85 500 -- <br /> 09/13/88 958 25 33 -1575 000 4 4 650 50 110 1,400 -- <br /> 11/16/88 9 58 25 31 -1573 000 <1 3 19 25 24 910 -- <br /> 02/09/89 958 2509 -1551 000 3 4 12 15 22 1,250 -- <br /> 05/31/89 958 26 72 -17 14 000 <0 5 14 24 46 790 -- <br /> 08/17/89 9 58 2844 -1886 000 10 29 13 12 1,200 -- <br /> 12/19/89 9 58 2945 -1987 000 -- -- __ -- __ <br /> 9 58 Well dry since 03/21/90 <br /> 12/30/93 958 2990 -2032 000 <br /> 02/17/94 958 2954 -1996 000 <br /> 05/10/94 958 29 13 -1955 000 <br /> 08/02/94 958 Well dry <br /> 11/01/94 9 58 Well dry <br /> 02/17/95 958 2841 -1883 000 -- -- __ __ __ <br /> 05/11/95 9 58 2572 -1614 000 14 1 2 75 48 350 -- <br /> 08/24/95 9 58 2335 -13 77 000 <0 5 <0 5 072 1 5 85 -- <br /> 10/19/95 958 2720 -1762 000 <0 5 <0 5 1 1 l 1 85 <2 5 <br /> 02/13/96 958 Well dry -- -- __ __ __ -- <br /> 04/18/96 958 2200 -1242 000 <05 <05 <05 068 65 <25 <br /> 08/08/96 958 2422 -1464 000 -- -- -- -- __ -- <br /> 11/04/96 958 2468 -15 10 000 -- -- __ __ __ -- <br /> 02/03/97 958 1989 -1031 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 05/08/97 963 1943 -10 80 000 <0 5 <0 5 <0 5 <0 5 56 <2 5 <br /> 08/26/97 863 2019 -1156 000 <0 5 <0 5 <0 5 <0 5 <50 <2 S <br /> 11/11/97 863 Well dry -- -- __ __ __ _- <br /> 03/03/98 863 16 12 -749 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> b 1prgj;L tsW3942Wmsterlu plgW I U942gw xls page 10 a f 46 <br />