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� � ! 1 � ! m m m m 0 0 I TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH _ Concentration(yg/L) Well Elevation to Water Elevation Thickness Ethyl_ Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE 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 -- P 1 12/30/93 779 2707 -1928 000 210 52 840 770 7,800 -- Pl 02/17/94 779 2675 -1896 000 57 29 250 190 2,300 -- P1 05/10/94 779 2641 -1862 0 00 120 60 450 370 4,800 -- P1 08/02/94 779 2787 -20 08 000 100 16 310 200 3,200 -- P 1 11101194 779 2820 -2041 000 52 <0 5 160 120 1,700 -- P1 02/17/95 779 25 52 -1773 000 80 5 8 300 180 4,000 -- P1 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 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 -- __ -- PI _P1 08/08/96 779 2141 -1362 000 -- -_ -- PI 11/04196 779 2205 -1426 000 67 <5 0 170 21 2,000 <25 P1 02/03/97 779 1750 -9 71 000 -- -- __ P1 05/08/97 643 1714 -1071 000 41 2 9 120 48 1,500 7 1 P1 08/26/97 643 18 82 -1239 000 -- -- -_ PI 11/11/97 643 1936 -1293 000 <05 <05 <05 <05 <50 <25 PI 03/03/98 643 1341 -698 000 20 1 1 91 28 940 13 PI 03/03/98 643 37* Pi 05/20/98 643 13 75 -732 000 20 <5 0 110 19 1,600 <25 P1 05/20/98 643 3 1* P1 08/19/98 643 1521 -878 000 16 2 5 17 1 3 250 3 0 P1 08/19/98 643 <2 0* PI 11/18/98 643 1561 -9 18 000 -- __ -- PI 03/30/99 643 -- _- P1 05/05/99 643 1437 -794 000 Pl 08/20/99 643 -- -- PI _PI 12/06/99 643 -- P1 02/29/00 643 P1 05/16/00 643 g 1projects1739424tnasterlwp1gO603U942gw xls Page 26 of 48