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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(fig/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 /> MW7 05/08/97 685 1731 -1046 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 08/26/97 2009 -13 24 000 -- -- __ __ <br /> 11/11/97 Well dry __ __ __ __ -- <br /> 03/03/98 13 85 -700 000 <0 5 <0 5 <0 5 <0 5 79c <2 5 <br /> 03/03/98 <2 0* <br /> 05/20/98 1398 -7 13 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 05/20/98 <2 0* <br /> 08/19/98 1543 -858 000 <05 <05 <05 <05 <50 <25 <br /> 08/19/98 <2 0* <br /> 11/18/98 1582 -897 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 03/30/99 -- -- __ <br /> 05/05/99 1433 -748 000 <0 5 <0 5 <0 5 0 637 542 <2 0 <br /> 08/20/99 15 75 -890 000 -- -_ __ <br /> 12/06/99 1597 -9 12 000 <1 <t <1 <1 92 <1 <br /> 02/29/00 1351 -666 000 1 6 <1 <1 <1 64 <1 <br /> 05/16/00 13 65 -680 000 <1 <1 <1 <1 <50 <1 <br /> 09/11/00 1592 -907 000 <0 5 <0 5 <0 5 <0 5 53 <0 5 <br /> MWS 04111188 779 2025 -1247 000 740 18,000 5,700 32,000 120,000 -- <br /> 09/13/88 2258 -14 80 000 470 11,000 3,900 20,000 56,000 - <br /> 11/16/88 2272 -1494 000 <500 9,300 3,600 16,000 63,000 -- <br /> 02/09/89 2228 -1450 000 650 13,000 3,900 21,000 62,500 -- <br /> 05/31/89 2395 -16 17 000 460 8,700 3,700 24,000 66,000 -- <br /> 08/17/89 2549 -1771 000 620 10,000 5,500 25,000 72,000 -- <br /> 12/19/89 2660 -1882 000 190 2,800 1,100 5,300 21,000 -- <br /> 03/21/90 27 11 -19 33 000 880 11,000 4,400 22,000 63,000 -- <br /> 05/17/90 2787 -2009 000 520 5,500 3,900 20,000 67,000 -- <br /> 09/25/90 29 17 -21 39 000 -- -- __ -- <br /> 12/19/90 29 13 -2135 000 <br /> 01/30/91 Dry -_ -- -_ -- __ <br /> 05102191 2939 -2161 000 830 5,900 4,900 23,000 57,000 -- <br /> !iprop.Lts173942Unasterlwp4g900U942bw AS Pa6e 11 of 37 <br />