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■w w 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 MW3 06/11/03 851 <0 5* MW3 09/17/03 8 51 2094 -1243 000 920 6 2 12 4 167 1,510 h 268 MW3 09/17/03 851 <0 5* MW3 12/08/03 8 51 2094 -1243 000 5 70 6 1 9 0 11 1 1,270 h 16 3 MW3 12/08/03 8 51 <0 5* MW3 03/02/04 851 1945 -1094 000 6 80 4 4 104 9 7 940 h 224 MW3 03/02/04 851 <0 5* MW3 06/28/04 851 2061 -12 10 000 -- -- -- -- -- -- MW3 06/29/04 851 -- -- -- 830 4 2 10 0 9 7 1,280 h 12 5 MW3 06/29/04 851 <0 5* MW3 09/27/04 851 2146 -1295 000 MW3 09/28/04 851 -- -- -- 890 113 6 7 15 6 1,000 h 9 4 MW3 09/28/04 851 <0 5* MW3 12/01/04 8 51 21 12 -1261 000 -- -- -- -- -- -- MW3 12/02/04 851 -- -- -- 560 4 6 101 9 2 1,090 h 12 3 MW3 12/02/04 851 <0 5* MW3 03/24/05 851 1926 -1075 000 770 3 6 8 1 6 4 1,250 h 6 3 MW3 03/24/05 851 <0 5* MW3 06/22/05 851 1924 -10,73 000 -- — — -- -- -- MW3 06/23/05 851 -- -- -- 750 2 5 6.4 4 7 685 h 7 9 MW3 06/23/05 851 <1* MW4 07116187 8 13 18 15 -1002 000 1,100 <50 850 1,750 4,900 -- MW4 04/11/88 8 13 2123 -13 10 000 510 <25 490 1,100 8,500 -- MW4 09/13/88 8 13 2366 -15 53 000 860 40 670 2,400 5,600 -- MW4 11/16/88 8 13 2381 -1568 000 860 340 810 1,000 8,000 -- MW4 02/09/89 8 13 23 55 -1542 000 630 20 530 650 4,800 -- MW4 05/31/89 8 13 25 01 -1688 000 790 35 720 1,300 6,000 -- MW4 08/17/89 8 13 2650 -1837 000 1,000 45 940 1,100 8,100 -- MW4 12/19/89 8 13 2757 -1944 000 190 2,800 1,100 380 7,900 -- MW4 03/21/90 8 13 2806 -1993 000 400 68 340 160 3,200 -- MW4 05/17/90 8 13 2887 -2074 000 300 40 150 93 3,500 -- MW4 01/28/92 813 Dry -- -- -- -- -- MW4 04/30/92 8 13 2953 -2140 000 -- -- -- -- -- -- MW4 08/13/92 813 Dry -- -- -- -- -- -- g Sprojecis173942Vnasterlwplg060543942gw As Page 9 of 59