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• i i TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA Casing Depth Groundwater LPH Concentration(pg/L) Well Elevation to Water Elevation Thickness Ethyl- No Date (feet msl) (feet) (feet MSI) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE IWI 01/30/91 7 80 3022 -2242 000 240 44 350 820 3,500 -- 05/02/91 30 11 -2231 000 150 25 230 520 2,500 -- 07116-17191 3107 -2327 000 -- __ __ __ __ 10/15/91 31 65 -23 85 000 120 36 280 390 3,400 -- 01/28/92 2991 -22 11 000 130 25 330 500 3,600 -- 04/30/92 2949 -2169 000 -- -- __ __ 08/13/92 3153 -2373 000 19 3 7 50 70 650 -- 10/08/92 32 13 -2433 000 -- -- __ __ __ 02/23/93 2878 -2098 000 -- -- __ 05/18/93 -- -- __ 08/22/93 2770 -1990 000 12/30/93 2750 -1970 000 02/17/94 2717 -1937 000 -- _- __ _- __ -_ 05/10/94 2886 -1906 000 41 7 7 180 230 2,000 -- 08/02/94 2829 -2049 000 55 3 8 210 240 2,100 -- 11/01/94 28 64 -2084 000 36 <1 0 170 220 1,900 -- 02/17/95 2603 -1823 000 73 <25 410 470 5,000 -- 05/11/95 2347 -1567 000 58 <10 350 400 4,700 08/24/95 2481 -1701 000 67 5 4 430 420 4,100 -- 10/19/95 2535 -17 55 000 29 <5 0 370 370 4,000 43 02/13/96 23 11 -1531 000 58 <5 0 370 390 5,400 -- 04/18/96 2080 -1300 000 60 <5 0 470 450 6,100 38 08/08/96 2202 -1422 000 -- -- -- -- __ -- 11/04/96 2246 -1466 000 50 <5 0 320 290 3,800 <25 02/03/97 17 87 -1007 0 00 48 <5 0 300 310 4,300 71 05/08/97 690 1752 -1062 000 <2 5 <2 5 170 150 2,600 16 08/26/97 1931 -1241 000 17 <2 5 130 97 2,400 14 11/11/97 19 85 -1295 000 30 <10 160 130 2,200 <50 03/03/98 14 11 -721 000 21 <5 0 220 170 2,900 <25 03/03/98 <5 9* 0512008 14 15 -725 000 17 <10 160 93 2,600 <50 flprolL�is573912Utwsierkwp1g9UDO9426w xis h6e 1 of37