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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(pg/L) Well Elevation to Water Elevation Thickness EthyI- Number Date _ (feet) (feet)- (feet) (feet) Benzene Toluene _benzene Xylenes TPH-g MTBE 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 02117/95 779 2552 -1773 000 80 5 8 300 180 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 -- P1 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 -- P1 04/18/96 779 2070 -1291 000 -- -- -- -- -- P1 08/08/96 779 2141 -1362 000 -- -- -- -- -- -- P1 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 1714 -1071 000 41 29 120 48 1,500 7 1 PI 08/26/97 643 1882 -1239 000 -- -- -- -- -- -- Pi 11/11/97 643 1936 -1293 000 <05 <05 <05 <05 <50 <25 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 Pi 05/20/98 643 3 1* P1 08/19/98 643 1521 -878 000 16 25 17 13 250 30 P1 08/19/98 643 <2 0* Pi 11/18/98 643 1561 -9 18 000 -- -- -- -- -- -- P1 03/30/99 643 -- -- -- P1 05/05/99 643 1437 -794 000 -- -- -- -- -- -- P2 01/30/91 787 3022 -2235 000 -- -- -- -- -- P2 05/02/91 787 30 13 -2226 000 140 13 650 610 5,400 -- P2 07/16-17/91 787 3105 -23 18 000 61 <5 300 220 5,200 -- P2 10/15/91 787 3164 -2377 000 20 82 90 63 1,500 -- P2 01/28/92 787 2993 -2206 000 53 24 170 120 2,900 -- P2 04/30/92 787 2951 -2164 000 52 <2 5 160 120 2,000 -- P2 08/13/92 787 3153 -2366 000 45 12 100 76 2,100 -- P2 10/08/92 787 32 17 -2430 000 34 20 60 80 2,000 -- P2 02/23/93 787 2879 -2092 000 58 30 44 34 1,000 -- g Iprojects1739421masterlwplq 10050942gw xls Page 31 of 58