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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 EthyI- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE S W 1 09/20/01 -- SWI -SW1 12/04/01 825 -- -- -- -- -- -- -- -- -- SWI 03/05/02 825 -- -- -- -- -- -- -- -- -- SWI 06/11/02 8 25 -- -- -- -- -- -- -- -- -- SWI 09/10/02 825 -- -- -- -- -- -- -- -- SWI 12/18/02 825 -- -- -- SWI -SW1 03/24/03 825 19 15 -10 90 000 -- -- -- -- -- SWI 03/25/03 825 -- -- -- 1,750 1,910 426 1,680 18,100 h 620 SWI. 03/25/03 825 <5* SWI 06/11/03 825 1926 -1101 000 1,970 2,510 570 2,080 18,700 h 580 SWI 06/11/03 825 <2 5* SWI 09/17/03 825 2064 -1239 000 2,210 1,810 534 1,690 17,800 h 102 SWI. 09/17/03 825 <5* SWI 12/08/03 825 2064 -1239 000 1,720 1,610 416 1,360 18,900 h 78 9 SWI 12/08/03 825 <0 5* SWI. 03/02/04 825 19 15 -1090 000 1,520 1,680 379 1,420 13,400 h 179 SWI 03/02/04 825 <5* SWI 06/28/04 8 25 2030 -1205 000 -- -- -- -- -- -- SWI 06/29/04 825 -- -- -- 1,830 1,960 549 1,720 18,400 h <0 5* SWI 09/27/04 825 21 17 -1292 000 -- -- -- -- --SWI 09/28/04 825 -- -- -- 2,240 2,050 614 1,880 19,300 h <0 5* SWI 12/01/04 825 2082 -1257 000 -- -- -- -- -- -- SWI 12/02/04 825 -- -- -- 946 2,830 788 3,310 20,000 h <0 5* SWI 03/24/05 825 1898 -1073 000 1,760 1,990 469 1,540 17,800 h <0 5* SWI 06/22/05 825 1902 -10.77 0.00 -- - _ -- _ -- SWI 06/23/05 825 -- -- - 1,990 2,180 548 1,940 17,300 h <0 5* SW2 i 02/17/94 -- 2870 -- 000 660 2,000 770 3,600 29,000 -- SW2 -- Not accessible since 02/17/94 SW2 02/17/95 -- 2757 Air sparging well--samples not collected SW2 05/11/95 -- 2484 Air sparging well--samples not collected SW2 08/24/95 -- -- Air sparging well--samples not collected SW2 10/19/95 -- -- Air sparging well--samples not collected g 4projects173942Umasterlwplg060513942gw xls Page 43 of 59