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TABLE 2 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- Numbei ) (feet) (feet) Benzene Date {feet) {feet _ e Toluene benzene Xylenes TPH-g MTBE --- ----- ---. __ -. _.--- 1W1 01/30/91 780 3022 -2242 000 240 44 350 820 3,500 IWI 05/02/91 780 30 11 -2231 000 150 25 230 520 2,500 -- ]W1 07/16-17/91 780 31 07 -2327 000 -- -- -- __ __ _ I W 1 10/15/91 780 31 65 -2385 000 120 36 280 390 3,400 IWI 01/28/92 780 2991 -22 It 000 130 25 330 500 3,600 IWI 04/30/92 780 2949 -2169 000 -- -- -_ __ __ IWI 08/13/92 780 31 53 -2373 000 19 37 50 70 650 -- I W I 10/08/92 780 32 13 -2433 000 -- -- __ __ __ IWI 02/23/93 780 2878 -2098 000 IWI 05/18/93 780 -- -- __ ]W1 08/22/93 780 2770 -1990 000 IWI 12/30/93 780 2750 -1970 000 IW1 02/17/94 780 2717 -1937 000 -- __ __ __ IWI 05/10/94 780 28 86 -1906 000 41 77 1$0 230 2,000 -- IW 1 08/02/94 780 2829 -2049 000 55 38 210 240 2,100 -- 1W1 11/01/94 780 2864 -2084 000 36 <1 0 170 220 1,900 -- lW 1 02/17/95 780 2603 -1823 000 73 <25 410 470 5,000 - )W1 05/11/95 780 2347 -1567 000 58 <10 350 400 4,700 IWI 08/24/95 780 2481 -1701 000 67 54 430 420 4,100 -- IWI 10/19/95 780 2535 -1755 000 29 <5 0 370 370 4,000 43 IW 1 02/13/96 780 23 11 -15 31 000 58 <5 0 370 390 5,400 -- IW1 04/18/96 780 2080 -1300 000 60 <5 0 470 450 6,100 38 IWI 08/08/96 780 2202 -1422 000 -- -- __ __ lW 1 11/04/96 780 2246 -1466 000 50 <5 0 320 290 3,800 <25 IWI 02/03/97 780 1787 -1007 000 48 <5 0 300 310 4,300 71 IWI 0510819- 690 1752 -1062 000 <2 5 <2 5 170 150 2,600 16 IWI 08/26/97 690 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 I W 1 03/03/98 690 14 11 -721 000 21 <5 0 220 170 2,900 <25 IWI 03/03/98 690 <5 9* 1 W I 05/20/98 690 14 15 -725 000 17 <10 160 93 2,600 <50 1 W 1 05/20/98 690 <2 0* glpru3ecls1739421maslerlwp1g030413942gw d, Pa6e l of 52