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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- Number Date (feet) (feet) (feet) (feet) Benzene 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 000 150 25 230 520 2,500 IWI 07/16-17/91 780 31 07 -2327 000 -- -- IWI 10/15/91 7 80 31 65 -23 85 000 120 36 280 390 3,400 IWI 01/28/92 7 80 2991 -2211 000 130 25 330 500 3,600 -- IW1 04/30/92 7 80 2949 -2169 000 -- -- -- IWI _1W1 08/13/92 7 80 31 53 -2373 000 19 3 7 50 70 650 IWI 10/08/92 780 32 13 -2433 000 -- -- -- IWI _IW1 02/23/93 780 2878 -2098 000 -- IW1 05/18/93 780 -- __ I W 1 08/22/93 7 80 2770 -1990 000 -- IW 1 12/30/93 7 80 2750 -1970 000 -- IWI 02/17/94 780 27 17 -1937 000 __ _- -- IWI 05/10/94 780 2886 -1906 000 41 7 7 180 230 2,000 -- ' 1 W 1 08/02/94 780 2829 -2049 000 55 3 8 210 240 2,100 1W1 11/01/94 780 2864 -2084 0 00 36 <1 0 170 220 1,900 IWI 02/17/95 780 2603 -1823 000 73 <25 410 470 5,000 ]WI 05/11/95 780 2347 -1567 000 58 <10 350 400 4,700 IWI 08/24/95 7 80 2481 -1701 000 67 5 4 430 420 4,100 -- IWI 10/19/95 7 80 2535 -1755 000 29 <5 0 370 370 4,000 43 IWI 02/13/96 7 80 23 11 -1531 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 IW 1 08/08/96 7 80 22 02 -1422 0 00 -- -- -- IWI IW1 11/04/96 780 2246 -14 66 000 50 <5 0 320 290 3,800 <25 IWI 02/03/97 7 80 l7 87 -1007 000 48 <5 0 300 310 4,300 71 IWI 05/08/97 690 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 19 85 -1295 000 30 <10 160 130 2,200 <50 IWI 03/03/98 690 1411 -721 000 21 <5 0 220 170 2,900 <25 IWI 03/03/98 690 <5 9* I W 1 05/20/98 6 90 14 15 -725 000 17 <10 160 93 2,600 <50 1 W I 05/20/98 690 <2 0* g 1projccts1739421masteAl%p1gi202U942gw xis Page t of 45