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m I_ TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHMG AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration( /L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW7 05/20/98 6 85 <2 0* MW7 08/19/98 6 85 1543 -858 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW7 08/19/98 685 <2 0* MW7 11/18/98 6 85 1582 -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 54 2 <2 0 MW7 08/20/99 685 1575 -890 000 MW7 12/06/99 685 1597 -9 12 000 <1 <1 <1 <1 92 <1 MW7 02/29/00 685 1351 -666 000 1 6 <1 <1 <1 64 <1 MW7 05/16/00 6 85 1365 -680 000 <1 <1 <1 <1 <50 <1 MW7 09/11/00 6 85 1592 -9 07 000 <0 5 <0 5 <0 5 <0 5 53 <0 5 MW7 12/13/00 6 85 1583 -898 000 076 28 063 309 <50 <0 5 MW7 03/08/01 6 85 14 97 -8 12 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW7 06/21/01 685 1633 -948 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW7 09/20/01 6 85 16 82 -997 000 MW7 12/04/01 6 80 17 18 -1038 000 MW7 03/05/02 6 80 1635 -955 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW7 06/11/02 6 80 MW7 09/10/02 6 80 1800 -1120 0 00 MW7 12/18/02 6 80 1773 -1093 000 MW7 03/24/03 680 1725 -1045 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW7 06/11/03 680 1738 -10 58 000 -- MW8 04/11/88 7 78 2025 -1247 000 740 18,000 5,700 32,000 120,000 -- MW8 09/13/88 7 78 2258 -1480 000 470 11,000 3,900 20,000 56,000 -- MWS 1(/16/88 778 2272 -1494 000 <500 9,300 3,600 16,000 63,000 -- MW 8 02/09/89 7 78 2228 -1450 000 650 13,000 3,900 21,000 62,500 -- MW8 05/31/89 778 2395 46 17 000 460 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 12/19/89 778 2660 -18 82 000 190 2,800 1,100 5,300 21,000 -- MWS 03/21/90 778 27 11 -1933 000 880 11,000 4,400 22,000 63,000 MW8 05/17/90 778 2787 -2009 0 00 520 5,500 3,900 20,000 67,000 - g SprojectsV739421masterSwp1g060313942gw x1s Page 14 of 48