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0 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-g MTBE RWI 08/26/97 770 2051 -1281 000 600 2,600 1,200 3,400 21,000 380 RWI 11/11/97 770 21 11 -1341 000 410 1,500 750 1,800 13,000 520 RWI 11/11/97 770 <25* RWI 03/03/98 770 15 51 -781 000 320 1,300 660 1,700 11,000 420 RWI 03/03/98 770 <33* RWI 05/20/98 770 1530 -760 000 310 1,500 670 1,800 13,000 760 RWI 05/20/98 770 <33* RWI 08/19/98 770 1675 -9 05 000 340 1,200 630 1,700 18,000 1,100 RW1 08/19/98 770 <40* RWI 11/18/98 770 1721 -951 000 250 840 520 1,100 8,200 90 R W 1 03/30/99 770 1531 -7 61 000 197 678 432 967 8,150 <20 RWI 05/05/99 770 1566 -796 000 234 833 499 1,270 8,680 58 4 RWI 08/20/99 770 1731 -9 61 000 234 415 409 728 6,450 315 RWI 12/06/99 770 1742 -9 72 0 00 180 220 310 500 4,300 <5 RWI 02/29/00 770 1505 -735 000 280 200 750 1,270 14,000 <1 RWI 05/16/00 7 70 14 88 -7 18 000 280 190 670 1,010 10,000 15 RWI 09/11/00 770 1725 -955 000 300 240 550 950 9,400 <5 RWI 12/13/00 770 1717 -947 000 330 470 1,400 3,210 29,000 <120 RWI 03/08/01 770 1635 -865 000 53 14 120 128 2,300 <0 5 RWI 06/21/01 770 1770 -1000 000 130 300 530 1,450 17,000 24 RWI 06/21/01 770 <5* RWI 09/20/01 770 1886 -11 15 0 O1 -- -- -- __ RWI 12/04/01 768 1864 -1096 000 -- -- -- -- RWI _RW1 03/05/02 768 17 80 -1012 000 148 820 214 298 3,360 h 970 RWI 03/05/02 768 <0 5* RWI 06/11/02 768 1828 -1060 000 755 25 0 120 950 1,640 h 23 5 RWI 06/11/02 768 <0 5* RWI 09/14/02 7 68 1950 -11 82 000 634 313 121 116 2,750 h 295 RWI 09/10/02 768 <0 5* RWI 12/18/02 768 1927 -1159 000 130 910 228 255 2,400 h 240 RWI 12/18/02 768 <5* RWI 03/24/03 768 1875 -1107 000 -- -- _- glpro3ects1739421masterlwp\gO6Q313942&'w xls Page 30 of 48