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TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration(pg/L) _ <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> IW1 01/30/91 7 80 3022 -2242 000 240 44 350 820 3,500 -- <br /> 05/02/91 7 80 3011 -2231 000 150 25 230 520 2,500 <br /> 07/16-17/91 780 3107 -2327 000 -- -- -- -- -- <br /> 10/15/91 7 80 3165 -23 85 000 120 36 280 390 3,400 -- <br /> 01/28/92 7 80 2991 -22 11 000 130 25 330 500 3,600 -- <br /> 04/30/92 7 80 2949 -21 69 000 -- -- -- -- -- <br /> 08/13/92 7 80 3153 -23 73 000 19 3 7 50 70 650 -- <br /> 10/08/92 7 80 32 13 -2433 000 -- -- -- -- -- <br /> 02/23/93 7 80 28 78 -2098 000 -- -- -- -- -- -- <br /> 05/18/93 7 80 -- -- -- -- -- -- - _- __ <br /> 08/22/93 7 80 2770 -1990 000 -- -- -- -- -- -- <br /> 12/30/93 780 2750 -1970 000 -- -- -- -- -- -- <br /> 02/17/94 7 80 27 17 -1937 000 -- -- -- -- -- <br /> 05/10/94 7 80 2886 -1906 000 41 7 7 180 230 2,000 -- <br /> 08/02/94 7 80 2829 -2049 000 55 3 8 210 240 2,100 -- <br /> 11/01/94 7 80 2864 -20 84 000 36 <1 0 170 220 1,900 -- <br /> 02/17/95 780 2603 -1823 000 73 <25 410 470 5,000 -- <br /> 05/11/95 780 2347 -15 67 000 58 <10 350 400 4,700 -- <br /> 08/24/95 780 2481 -1701 000 67 5 4 430 420 4,100 -- <br /> 10/19/95 7 80 2535 -17 55 000 29 <5 0 370 370 4,000 43 <br /> 02/13/96 7 80 23 11 -1531 000 58 <5 0 370 390 5,400 -- <br /> 04/18/96 780 2080 -1300 000 60 <5 0 470 450 6,100 38 <br /> 08/08/96 780 2202 -1422 000 -- -- -- -- -- -- <br /> 11/04196 780 2246 -1466 000 50 <5 0 320 290 3,800 <25 <br /> 02/03/97 7 80 17 87 -1007 000 48 <5 0 300 310 4,300 71 <br /> 05/08/97 690 1752 -1062 000 <2 5 <2 5 170 150 2,600 16 <br /> 08/26/97 690 1931 -1241 000 17 <2 5 130 97 2,400 14 <br /> 11/11/97 690 19 85 -1295 000 30 <10 160 130 2,200 <50 <br /> 03/03/98 690 14 11 -721 000 21 <5 0 220 170 2,900 <25 <br /> 03/03/98 690 <5 9* <br /> 05/20/98 690 14 15 -7 25 000 17 <10 160 93 2,600 <50 <br /> 05/20/98 690 <2 0* <br /> 08119/98 690 1566 -876 000 12 <2 5 120 79 1,600 28 <br /> �prolccts1739421Lnasler\kPtigb0113942gw Ms <br /> Pagel of 37 <br /> I <br />