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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( /L) Well Elevation to Water Elevation Thickness Ethyl- Number er Date (feet) (feet) (feet) (feet) Benzene fe _ Toluene benzene _Xylenes TPH-g MTBE _ IWI 01/30/91 780 3022 -2242 0 00 240 44 350 820 3,500 - IWI 05/02/91 7 80 30 11 -2231 0 00 150 25 230 520 2,500 -- IWI 07116-17/91 7 80 31 07 -2327 0 00 -- -- _- -- IWI 10/15/91 7 80 3165 -23 85 0 00 120 36 280 390 3,400 [WI 01/28/92 7 80 29 91 -22 It 0 00 130 25 330 500 3,600 IWI 04/30/92 780 2949 -2169 000 -- -- -- __ __ lW 1 08/13/92 7 80 3153 -2373 000 19 3 7 50 70 650 IWI 10/08/92 780 32 13 -2433 000 -- -- -- __ -- IWI 02/23/93 7 80 2878 -2098 000 IWI -- 05/18/93 7 80 -- -- -- IWI _iWI 08/22/93 780 2770 -1990 000 IWI 12/30/93 780 2750 -1970 000 IWI 02/17/94 7 80 27 17 -1937 000 -- -- -- __ __ IWI 05/10/94 780 28 86 -1906 000 41 7 7 180 230 2,000 IWI 08/02/94 7 80 28 29 -2049 000 55 3 8 210 240 2,100 IWI 11/01/94 7 80 2864 -2084 000 36 <1 0 170 220 1,900 IWI 02/17/95 780 2603 -18 23 000 73 <25 410 470 5,000 IWI 05/11/95 7 80 2347 -1567 000 58 <10 350 400 4,700 -- IW 1 08/24/95 780 2481 -1701 000 67 5 4 430 420 4,100 -- 1W 1 10/19/95 7 80 25 35 -1755 000 29 <5 0 370 370 4,000 43 IWI 02/13/96 7 80 23 11 -15 31 000 58 <5 0 370 390 5,400 -- IWI 04/18/96 7 80 2080 -1300 000 60 <5 0 470 450 6,100 38 IWI 08/08/96 780 2202 -1422 000 -- -- -- -- __ -- IWI 11/04/96 7 80 2246 -14 66 000 50 <5 0 320 290 3,800 <25 IWI 02/03/97 7 80 l7 87 -10 07 000 48 <5 0 300 310 4,300 71 IWI 05/08/97 690 l7 52 -1062 000 <2 5 <2 5 170 t50 2,600 16 1 W 1 08/26/97 6 90 1931 -1241 000 17 <2 5 130 97 2,400 14 IWI 11/11/97 690 1985 -1295 000 30 <10 160 130 2,200 <50 IWI 03/03/98 690 1411 -7 21 000 21 <5 0 220 170 2,900 <25 IWI 03/03/98 690 <5 9* IW 1 05/20/98 690 1415 -725 000 17 <10 160 93 2,600 <50 IWI 05/20/98 690 <2 0* G 1Pralec[s173942VAS7 ERIWPMP0303U942gw xis Page 1 of 45