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1 ABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942, 4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration ()ig/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 /> S W2 03/08/01 <br /> 06/21/01 -- -- __ -- -- -- -- -_ -- <br /> V 1 05/02/91 857 31 74 -23 17 000 20,000 49,000 4,700 25,000 130,000 -- <br /> 07/16-17/91 857 3270 -24 13 000 14,000 44,000 3,000 15,000 170,000 -- <br /> 10/15/91 857 3325 -2468 000 18,000 51,000 4,200 23,000 200,000 -- <br /> 01/28/92 857 3151 -22 94 Sheen 20,000 58,000 2,400 23,000 150,000 -- <br /> 04/30/92 857 31 12 -2255 000 15,000 43,000 3,000 18,000 130,000 -- <br /> 08/13/92 857 33 17 -2460 000 12,000 44,000 3,600 20,000 180,000 -- <br /> 10/08/92 857 3376 -25 18 001 Not sampled - LPH <br /> 02/23/93 8 57 3047 -2190 000 9,800 19,000 3,700 18,000 100,000 -- <br /> 05/18/93 857 -- -- __ __ <br /> 08/22/93 8 57 2970 -21 13 000 <br /> 12/30/93 8 57 2905 -2048 000 <br /> 02/17/94 857 2873 -20 16 000 -- -- __ -- <br /> 05/10/94 857 2833 -1976 000 8,200 37,000 3,600 17,000 110,000 -- <br /> 08/02/94 857 -- -- -- __ __ <br /> 11/01/94 857 3005 -2148 000 <br /> 02/17/95 857 2763 -1906 000 <br /> 05/11/95 857 2487 -1630 000 <br /> 08/24/95 857 -- -- -- <br /> 10/19/95 857 Well dry <br /> 02/13/96 857 Well dry <br /> 04/18/96 857 Well dry <br /> 08/08/96 857 Well dry -- -- -- -- -- -- <br /> 11/04/96 857 Well dry -- -- -- -- -- -- <br /> 02/03/97 857 Well dry <br /> e�pro3cabV739421uiaslerliaplg6O)U942gw As Page 37 of46 <br />