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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 L Well Elevation to Water Elevation Thickness Ethyl- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE MW8 09/17/03 642 6 50* MW8 12/08/03 642 1806 -1164 000 339 143 780 1,520 8,410 h 144 MW8 12/08/03 642 5 00* MW8 03/02/04 642 1651 -10 09 000 180 115 726 1,370 6,800 h 165 MW8 03/02/04 642 7 00* MW8 06/28/04 642 1770 -1128 000 -- -- -- __ -- MW8 06/29/04 642 -- -- -- 242 85 3 754 1,200 6,900 h 4 40* MW8 09/27/04 642 1849 -1207 0 00 -- -- __ __ __ -- MW8 09/28/04 642 -- -- -- 273 688 647 112 712 h 2 30* MW8 J 12/01/04 642 1820 -1178 0 00 I5 0 116 674 1,390 7,720 h 2 20* MW8 03/24/05 642 1622 -980 000 -- -- -- _- -- MW8 03/25/05 642 -- -- -- 190 800 581 1,100 5,650 h 2 80* MW8 06/22/05 642 1635 -9 93 000 215 806 554 1,140 5,570 h 2 10* MW8 10/12/05 642 1776 -1134 000 <50 <50 490 800 5,000 h 1 1* MW8 J,q 12/22/05 642 1768 -1126 000 <25 36 360 690 4,100 h 0 58* MW9 04/11/88 788 2081 -1293 000 <50 <50 <50 <50 2,100 -- MW9 09/13/88 788 23 14 -1526 000 85 67 100 90 35,000 -- MW9 11/16/88 788 23 24 -1536 000 70 12 14 19 2,200 -- MW9 02/09/89 7 88 2279 -1491 000 12 16 4 1 3 4 800 -- MW9 05/31/89 788 2447 -1659 000 14 <0 5 12 1 3 540 -- MW9 08/17/89 788 2605 -18 17 000 5 <0 5 2 <0 5 <250 -- MW9 12/19/89 7 88 26 97 -19 09 000 66 1 1 <0 5 12 470 -- MW9 03/21/90 7 88 2745 -1957 000 84 10 2 1 3 7 160 -- MW9 05/17/90 788 2823 -2035 000 2 0 093 089 <0 5 120 -- MW9 09/25/90 788 Dry __ __ -- __ __ MW9 12/19/90 788 2933 -2145 000 MW9 01/30/91 788 Dry MW9 05/02/91 788 2945 -2157 000 MW9 07/16-17/91 788 2960 -2172 a 000 MW9 101I5/91 7 88 Dry MW9 01/28/92 788 Dry MW9 04/30/92 7 88 2907 -21 19 000 g Iprojects1739421masterlwplq t2050942gw xls Page 20 of 59