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� ■w� �� war �� a� �w �� A■� �■� � � � � � TABLE 1 GROUNDWATER GAUGING DATA AND ANALYTICAL RESULTS, FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA, 1987-1999 Casing Depth. Groundwater LPH Concentration Gig/L,) Well Elevation to Water Elevation Thickness Ethyl- No Date (ft msI) (ft) (ft msl) (ft) Benzene Toluene benzene Xylenes TPH-g MTBE IW 1 01/30/91 780 3022 -2242 000 240 44 350 820 3,500 -- 05/02/91 30 11 -2231 000 I50 25 230 520 2,500 -- 07/16-17/91 3107 -2327 000 -- -- -- -- -- 10/15/91 3165 -23 85 000 120 36 280 390 3,400 -- 01/28/92 2991 -22 11 000 130 25 330 500 3,600 -- 04/30/92 2949 -2169 000 -- -- -- -- -- 08/13/92 3153 -23 73 000 19 3 7 50 70 650 -- 10/08/92 3213 -2433 000 -- -- -- -- -- 02/23/93 28 78 -2098 000 05/18/93 -- -- -- 08/22/93 2770 -1990 000 -- -- -- -- -- -- 12/30/93 2750 -1970 000 -- -- -- -- -- -- 02/17/94 27 17 -1937 000 -- -- -- -- -- -- 05/10/94 2886 -1906 000 41 7 7 180 230 2,000 -- 08/02/94 2829 -2049 000 55 38 210 240 2,100 -- 11/01/94 2864 -2084 000 36 <1 0 170 220 1,900 -- 02/17/95 2603 -1823 000 73 <25 410 470 5,000 -- 05/11/95 2347 -1567 000 58 <10 350 400 4,700 -- 08/24/95 2481 -1701 000 67 5 4 430 420 4,100 -- 10/19/95 2535 -1755 000 29 <5 0 370 370 4,000 43 02/13/96 23 11 -1531 000 58 <5 0 370 390 5,400 -- 04/18/96 20 80 -1300 000 60 <5 0 470 450 6,100 38 08/08/96 2202 -1422 000 -- -- -- -- -- -- 11/04/96 2246 -1466 000 50 <5 0 320 290 3,800 <25 02/03/97 1787 -1007 000 48 <5 0 300 310 4,300 71 05/08/97 690 17 52 -1062 000 <2 5 <2 5 170 150 2,600 16 08/26/97 1931 -1241 000 17 <2 5 130 97 2,400 14 11/11/97 1985 -1295 000 30 <10 160 130 2,200 <50 03/03/98 14 11 -721 000 21 <5 0 220 170 2,900 <25 03/03/98 <5 9* 05/20/98 14 15 -725 000 17 <10 160 93 2,600 <50 71942 Q1299T1 XL$ Page t