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s • • 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 Ethyl- i Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW13 09/10/02 8 08 2140 -13 32 000 MW13 12/18/02 808 21 12 -1304 000 MW13 03/24/03 808 2043 -1235 000 -- — -- MW13 MW13 0312 5/03 8 08 -- — -- <0 5 <0 5 <0 5 <0 5 <50 h <0 5 P1 01/30/91 779 3024 -2245 000 -- __ __ Pl 05/02/91 779 30 13 -2234 000 340 5 430 520 3,700 PI 07116-17191 779 3109 -2330 000 160 <2 5 160 240 3,000 PI 10/15/91 779 3168 -2389 000 69 3 4 63 73 1,300 -- PI 01/28/92 779 2993 -22 14 000 110 26 270 330 2,000 -- PI 04/30/92 779 2956 -21 77 000 120 <10 540 600 4,700 P1 08/13/92 779 31 57 -2378 000 72 4 5 260 260 2,900 - P1 10/08/92 779 32 17 -2438 000 18 2 8 52 45 1,100 -- P1 02/23/93 779 2882 -2103 0 00 66 1 8 200 200 2,300 -- P1 05/18/93 779 2746 -1967 000 43 18 290 220 3,200 -- P1 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 -- PI 02/17/94 779 2675 -1896 000 57 29 250 190 2,300 PI 05/10/94 779 2641 -1862 000 120 60 450 370 4,800 P) 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 5 8 300 180 4,000 131 05/11/95 779 2295 -15 16 000 55 <5 0 160 110 2,400 Pi 08/24/95 779 2431 -1652 000 <5 0 8 0 350 230 2,900 PI 10/19/95 779 2478 -1699 000 84 9 7 250 180 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 __ _- -- PI 11/04/96 779 2205 -1426 000 67 <5 0 170 21 2,000 <25 PI 02/03/97 779 1750 -971 000 _- __ __ P1 05/08/97 643 17 14 -1071 000 41 2 9 120 48 1,500 7 1 P1 08/26/97 643 18 82 -1239 000 -- -- 6 Npro3ects1739421aieasterlwp1gO303139421,w xis Page 25 of 47