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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- MTBE MW13 1 06/22/05 808 2046 -12.38 000 <0.5 <0 5 <0 5 <0 5 <50 It <0 5* PI 01/30/91 779 3024 -2245 000 -- -- -- -- -- -- P1 05/02/91 779 30 13 -2234 000 340 5 430 520 3,700 -- P1 07/16-17191 779 3109 -2330 000 160 <2 5 160 240 3,000 -- 131 10/15/91 779 3168 -23 89 000 69 34 63 73 1,300 -- P1 01/28/92 779 2993 -22 14 000 110 26 270 330 2,000 -- P1 04/30/92 779 2956 -2177 000 120 <10 540 600 4,700 -- P1 08/13/92 779 3157 -2378 1110 72 45 260 260 2,900 -- P1 10/08/92 779 32 17 -2438 000 18 28 52 45 1,100 -- Pl 02/23/93 779 2882 -2103 000 66 18 200 200 2,300 -- Pl 05/18/93 779 2746 -1967 000 43 18 290 220 3,200 -- PI 08/22/93 779 2772 -1993 000 44 69 160 130 1,900 -- P1 12/30/93 779 2707 -1928 000 210 52 840 770 7,800 -- P1 02/17/94 779 2675 -1896 000 57 29 250 190 2,300 -- 111 05/10/94 779 2641 -1862 000 120 60 450 370 4,800 PI 08/02/94 779 2787 -2008 000 100 16 310 200 3,200 -- PI 11/01/94 779 2820 -2041 000 52 <0 5 160 120 1,700 -- P1 02/17/95 779 2552 -1773 000 80 58 300 180 4,000 -- Pl 05/11/95 779 2295 -15 16 000 55 <5 0 160 110 2,400 -- P1 08/24/95 779 2431 -1652 000 <5 0 80 350 230 2,900 -- PI 10/19/95 779 2478 -1699 000 84 97 250 180 2,700 <25 PI 02/13/96 779 2252 -1473 000 84 <5 0 230 70 3,300 -- PI 04/18/96 779 2070 -1291 000 -- -- -- -- -- PI 08/08/96 779 2141 -1362 000 -- -- -- -- -- -- Pi 11/04/96 779 2205 -1426 000 67 <5 0 170 21 2,000 <25 Pi 02/03/97 779 1750 -971 000 -- -- -- -- -- -- PI 05/08/97 643 17 14 -1071 000 41 29 120 48 1,500 71 P1 08/26/97 643 1882 -1239 000 -- -- -- -- -- -- Pi 11/11/97 643 1936 -1293 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 P1 03/03/98 643 1341 -698 000 20 1 1 91 28 940 13 P1 03/03/98 643 3 7* P1 05/20/98 643 1375 -732 000 20 <5 0 110 19 1,600 <25 9 1proiecis1739421masterlwp\g0605L3942gw As Page 30 of 59