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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 000 240 44 350 820 3,500 IWI 05/02/91 780 30 11 -2231 000 150 25 230 520 2,500 IWI 07/16-17191 780 3107 -2327 000 -- -- -- IWI -IW1 10/15/91 780 31 65 -23 85 000 120 36 280 390 3,400 IWI 01/28/92 7 80 2991 -22 11 000 130 25 330 500 3,600 -- I W I 04/30/92 7 80 2949 -2169 0 00 -- __ __ IW 1 08/13/92 7 80 31 53 -23 73 000 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, -IW1 08/22/93 780 2770 -1990 000 IWI 12/30/93 780 2750 -1970 000 IW 1 02/17/94 7 80 27 17 -1937 000 -- -- _- IWI 05/10/94 7 80 2886 -1906 000 41 7 7 180 230 2,000 I W I 08/02/94 780 2829 -2049 000 55 3 8 210 240 2,100 ]WI 11/01/94 7 80 2864 -2084 000 36 <1 0 170 220 1,900 -- IWI 02/17/95 7 80 2603 -1823 0 00 73 <25 410 470 5,000 -- IWI 05/11/95 7 80 2347 -15 67 000 58 <10 350 400 4,700 -- I W 1 08/24/95 7 80 2481 -1701 000 67 5 4 430 420 4,100 -- IWI 10/19/95 780 25 35 -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 -- IW1 04/18/96 790 2080 -1300 000 60 <5 0 470 450 6,100 38 IWI 08/08/96 7 80 2202 -1422 000 -- __ __ IWI 11/04/96 7 80 2246 -1466 000 50 <5 0 320 290 3,800 <25 1 W 1 02/03/97 7 80 1787 -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 I W 1 08/26/97 690 1931 -1241 0 00 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 14 11 -721 000 21 <5 0 220 170 2,900 <25 1W1 03/03/98 690 <5 9* IWI 05/20/98 690 14 15 -725 000 17 <10 160 93 2,600 <50 IWI. 05/20/98 690 <2 0* g 1projects173942Vmasterlwp1gb60213942gw x1s Page i of 43