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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(µg/L) _ Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE RW1 08/19/98 770 1675 -905 000 340 1,200 630 1,700 18,000 1,100 RW 1 08/19/98 770 <40* RW 1 11/18/98 770 1721 -951 000 250 840 520 1,100 8,200 90 RW 1 03/30/99 770 15 31 -761 000 197 678 432 967 8,150 <20 RW 1 05/05/99 770 1566 -796 000 234 833 499 1,270 8,680 584 RW 1 08/20/99 770 1731 -961 000 234 415 409 728 6,450 315 RW 1 12/06/99 770 1742 -972 000 180 220 310 500 4,300 <5 RW 1 02/29/00 770 1505 -735 000 280 200 750 1,270 14,000 <1 RW 1 05/16/00 770 1498 -7 18 000 280 190 670 1,010 10,000 15 RWl 09/11/00 770 1725 -955 000 300 240 550 950 9,400 <5 RW 1 12/13/00 770 17 17 -947 000 330 470 1,400 3,210 29,000 <120 RW1 03/08/01 770 1635 -865 000 53 14 120 128 2,300 <0 5 RW1 06/21/01 770 1770 -1000 000 130 300 530 1,450 17,000 24 RW 1 06/21/01 770 <5* RW I 09/20/01 770 1886 -11 15 001 -- -- -- -- -- -- RW1 12/04/01 768 1864 -1096 000 -- -- -- -- -- -- RW1 03/05/02 768 1780 -1012 000 148 820 214 298 3,360 h 970 RW I 03/05/02 768 <0 5* RW1 06/11/02 768 1828 -1060 000 755 250 120 950 1,640 h 23 5 RW 1 06/11/02 768 <0 5* RW I 09/10/02 768 1950 -1182 000 634 313 121 116 2,750 h 295 RW1 09/10/02 768 <0 5* RW1 12/18/02 768 1927 -1159 000 130 910 228 255 2,400 h 240 RW1 12/18/02 768 <5* RW1 03/24/03 768 1875 -1107 000 -- -- -- -- -- -- RW I 03/25/03 768 -- -- -- 105 698 163 229 3,690 h 208 RW 1 03/25/03 768 <0 5* RW 1 06/I 1103 768 1887 -11 19 000 180 115 187 251 4,740 h 706 RW 1 06/11/03 768 <0 5* RW1 09/17/03 768 2026 -1258 000 176 127 298 590 5,300 h 696 RW 1 09/17/03 768 <0 5* RWi 12/08/03 768 2025 -1257 000 147 897 239 349 5,140 h 442 RWI 12/08/03 768 <0 5* g Wojec1s1739421masteriwplq 1005�3942gw x1s Page 34 of 58