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TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA Casing Depth Groundwater LPH Concentration_(ug/l.) Well Elevation to Water Elevation Thickness Ethyl- No Date _ (feet msl) (feet) -- (feet msl) (feet) Benzene Toluene benzene _ Xylenes TPH-g MTBE MW7 08/24/95 835 Well dry 10/19/95 835 Well dry 02/13/96 835 Well dry 04/18/96 8 35 Well dry 08/08/96 835 2160 -1325 000 11/04/96 835 2250 -14 15 000 -- __ __ __ 02/03/97 835 1758 -923 000 <0 5 <0 5 <0 5 <0 5 71 <2 5 05/08/97 685 1731 -1046 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 08/26/97 6 85 2009 -1324 000 -- -- _- __ 11/11/97 6 85 Well dry __ __ __ -- 03/03/98 685 13 85 -700 000 <0 5 <0 5 <0 5 <0 5 79c <2 5 03/03/98 6 85 <2 0* 05/20/98 6 85 1398 -7 13 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 05/20/98 6 85 <2 0* 08/19/98 685 1543 -8 58 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 08/19/98 6 85 <2 0* 11/18/98 685 1582 -897 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 03/30/99 6 85 -- -- -- -- __ __ __ 05/05/99 6 85 1433 -748 000 <0 5 <0 5 <0 5 0 637 542 <2 0 08/20/99 6 85 15 75 -890 000 -- -- _- -- __ -- 12/06/99 6 85 1597 -912 000 <1 <1 <1 <1 92 <1 02/29/00 6 85 13 51 -666 000 16 <1 <1 <1 64 <1 05/16/00 6 85 13 65 -680 000 <1 <1 <1 <1 <50 <1 09/11/00 6 85 15 92 -907 000 <0 5 <0 5 <0 5 <0 5 53 <0 5 12/13/00 685 15 83 -898 000 076 2 8 063 309 <50 <0 5 03/08/01 685 1497 -8 12 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 06/21/01 6 85 1633 -9 48 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW8 04/11/88 778 2025 -1247 000 740 18,000 5,700 32,000 120,000 -- 09/13/88 778 22 58 -14 80 000 470 11,000 3,900 20,000 56,000 -- 11/16/88 778 2272 -1494 000 <500 9,300 3,600 16,000 63,000 -- 02/09/89 7 78 2228 -1450 000 650 13,000 3,900 21,000 62,500 -- 05/31/89 778 2395 -1617 000 460 8,700 3,700 24,000 66,000 -- g 1projec ts173942'masterlwp%g6Ol13942gw x1s Page l l of 37