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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 Ethyl- Number Date (feet) (feet) (feet) - (feet) Benzene Toluene benzene Xylenes TPH-g MTBE RW2 12/04/01 676 1754 -1078 000 39 19 150 1133 2,800 <5* RW2 03/05/02 676 1665 -989 000 51 5 290 176 182 4,560 h 132 RW2 03/05/02 676 <0 5* RW2 06/11/02 676 1723 -1047 000 360 144 106 745 3,830 h 660 RW2 06/11/02 676 <0 5* RW2 09/10/02 676 1837 -1161 000 600 240 154 95 0 4,380 h 103 RW2 09/10/02 676 <5* RW2 12/18/02 676 18 12 -1136 000 540 208 134 69 4 2,200 h 15 5 RW2 12/18/02 676 <0 5* RW2 03/24/03 676 1740 -1064 000 262 75 55 8 257 2,950 h 274 RW2 03/24/03 676 <0 5* RW2 06/11/03 676 1776 -1100 000 42 2 15 0 813 42 7 2,450 h 627 RW2 06/11/03 676 <0 5* RW2 09/17/03 676 1915 -1239 000 108 246 179 932 3,140 h 138 RW2 09/17/03 676 <0 5* RW2 12/08/03 676 1914 -1238 000 689 19 6 106 462 1,400 h 63 7 RW2 12/08/03 676 <0 5* RW2 03/02/04 676 1761 -1085 0 00 586 171 113 628 5,460 h 85 0 RW2 03/02/04 676 <0 5* RW2 06/28/04 676 1883 -1207 0 00 -- -- -- -- -- -- RW2 M29/04 676 -- -- -- 190 68 421 21 2 1,840 h 27 1 RW2 06/29/04 676 <0 5* RW2 09/27/04 676 1970 -1294 000 697 214 125 53 3 4,170 h 68 1 RW2 09/27/04 676 <0 5* RW2 12/01/04 676 1933 -1257 000 -- -- -- -- -- -- RW2 12/02/04 676 -- -- -- 188 8 3 365 22 1 1,530 h 25 8 RW2 12/02/04 6 76 <0 5* RW2 03/24/05 676 1744 -1068 000 103 3 0 184 88 894 h 7 9 RW2 03/24/05 676 <0 5* RW2 06/22/05 676 1749 -1073 000 -- -- -- -- -- -- RW2 06/23/05 676 -- -- -- 15 1 4 0 224 86 1,190 h 168 RW2 06/23/05 676 <1* RW2 10/12/05 676 1892 -12.16 000 34 12 91 29 3,100 h <50 g Ipro3ects17394Zmaster4plq 1005U942gw xis Page 37 of 58