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TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942, 4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA f Casing Depth Groundwater LPH _ Concentration (µg/L) Well Elevation to Water Elevation Thickness Ethyl- No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW7 05/20/98 685 <2 0* MW7 08/19/98 685 1543 -8 58 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW7 08/19/98 6 85 <2 0t MW7 11/18/98 6 85 15 82 -897 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW7 03/30/99 6 85 -- -- -- -- -- -- -- -- MW7 05/05/99 6 85 1433 -748 000 <0 5 <0 5 <0 5 0 637 542 <2 0 MW7 08/20/99 6 85 15 75 -890 000 -- -- -- -- -- -- MW7 12/06/99 6 85 15 97 -912 000 <1 <1 <1 <1 92 <1 MW7 02/29/00 6 85 13 51 -666 000 16 <1 <1 <1 64 <1 MW7 05/16/00 6 85 13 65 -680 000 <1 <1 <1 <1 <50 <1 MW7 09/11/00 6 85 1592 -907 000 <0 5 <0 5 <0 5 <0 5 53 <0 5 MW7 12/13/00 6 85 15 83 -8 98 000 076 28 0 63 3 09 <50 <0 5 MW7 03/08/01 6 85 1497 -8 12 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW7 06/21/01 6 85 1633 -948 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW7 09/20/01 6 85 1682 -997 000 -- -- -- -- -- MW8 04/11/88 778 2025 -1247 000 740 18,000 5,700 32,000 120,000 -1 MW8 09/13/88 7 78 2258 -1480 000 470 11,000 3,900 20,000 56,000 -; MW8 11/16/88 7 78 2272 -1494 000 <500 9,300 3,600 16,000 63,000 -- MW8 02/09/89 778 2228 -1450 000 650 13,000 3,900 21,000 62,500 -- MW8 05/31/89 778 23 95 -1617 000 460 8,700 3,700 24,000 66,000 MW8 08/17/89 7 78 2549 -1771 000 620 10,000 5,500 25,000 72,000 -- MW8 12/19/89 779 2660 -1882 000 190 2,800 1,100 5,300 21,000 -- MW8 03/21/90 778 27 11 -1933 000 880 11,000 4,400 22,000 63,000 MW8 05/17/90 7 78 27 87 -2009 000 520 5,500 3,900 20,000 67,000 -{ MW8 09/25/90 778 2917 -21 39 000 -- -- -- -_ -_ _ro MW8 12/19/90 7 78 29 13 -2135 000 -- -- -- -- -= r �dd �prnµct�17394?Im.1$tLr\%�p%g91111393Zg��xis Page 14 of 47 g