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i TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration( IL) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) _ (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE IW I 01/30/91 7 80 3022 -2242 000 240 44 350 820 3,500 -- IW i 05/02/91 790 30 It -2231 000 150 25 230 520 2,500 -- I W I 07116-17/91 7 80 3107 -2327 000 -- -- -- __ __ IW I 10/15/91 7 80 31 65 -23 85 000 120 36 280 390 3,400 -- IW I 01/28/92 7 80 2991 -22 11 000 130 25 330 500 3,600 1W] 04/30/92 7 80 2949 -2169 000 -- -- -- ]WI _IW1 08/13/92 7 80 3153 -23 73 000 19 3 7 50 70 650 -- I W 1 10/08/92 7 80 32 13 -2433 000 -- -- -_ -- 1W] 02/23/93 780 2878 -20 98 000 IW 1 05/18/93 780 -- -- -- ]W 1 08/22/93 780 2770 49 90 000 -- I W l 12/30/93 780 2750 -1970 000 IW l 02/17/94 780 27 17 -1937 000 -- -- __ __ IW 1 05/10/94 7 80 28 86 -1906 000 41 7 7 180 230 2,000 - W 1 08/02/94 780 2829 -2049 000 55 3 8 210 240 2,100 -- IW I 11/01/94 7 80 2864 -2084 000 36 <1 0 170 220 1,900 -- 1 W 1 02/17/95 7 80 2603 -1823 000 73 <25 410 470 5,000 -- IW] 05/11/95 7 80 2347 -15 67 000 58 <10 350 400 4,700 -- 1W] 08/24/95 7 80 2481 -1701 000 67 5 4 430 420 4,100 -- IW I 10/19/95 7 80 25 35 -1755 000 29 <5 0 370 370 4,000 43 1W I 02/13/96 7 80 23 11 -1531 000 58 <5 0 370 390 5,400 -- 1W 1 04/18/96 7 80 2080 -1300 000 60 <5 0 470 450 6,100 38 I W] 08/08/96 7 80 22 02 -14 22 000 -- -- __ __ 1W I 11/04/96 780 2246 -1466 000 50 <5 0 320 290 3,800 <25 1 W 1 {12/03197 7 80 1787 -1007 000 48 <5 0 300 310 4,300 71 IW 1 05/08/97 690 1752 -1062 000 <2 5 <2 5 170 150 2,600 16 W 1 08/26/97 690 1931 -1241 000 17 <2 5 130 97 2,400 14 IW I 11/11/97 690 1985 -1295 000 30 <10 160 130 2,200 <50 IW I 03/03/98 690 1411 -721 000 21 <5 0 220 170 2,900 <25 1 W I 03/03/98 690 <5 9* W I 05/20/98 690 14 15 -725 000 17 <10 160 93 2,600 <50 !W l 05120/98 6 90 <2 0* IW I 08/19/98 690 1566 -876 000 12 <2 5 120 79 1,600 28 IW l 08/19/98 690 <4 0* 1plu}uta1739421masterSuply(N)0313942t,wAk Page l of 47