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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 L Well Elevation to Water EIevation Thickness Ethyl- Number Date feet (feet)_____ feet feet Benzene Toluene benzene Xylenes TPH-g MTBE 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 SW2 02/13/96 -- -- Air sparging well--samples not collected SW2 04/18/96 -- -- Air sparging well--samples not collected SW2 08/08/96 -- -- Air sparging well--samples not collected SW2 11/04/96 -- 23 72 -- 000 110 <1 2 <1 2 2 0 320 <6 2 SW2 12/04/01 753 1850 -1097 000 -- -- -- -- -- -- SW2 03/05/02 7 53 -- -- -- -- -- -- - -_ __ SW2 06/11/02 7 53 SW2 09/10/02 753 SW2 12/18/02 753 -- -- -- -- -- -- __ SW2 03/24/03 753 1855 -1102 000 1,360 <5 330 <5 6,980 h 260 SW2 03/24/03 7 53 <2 5* SW2 06/11/03 7 53 1873 -1120 000 2,570 200 62 0 2206,770 h 380 SW2 06/11/03 753 <0 5* SW2 09/17/03 753 20 14 -1261 000 2,170 275 876 408 7,840 h 804 SW2 09/17/03 753 <0 5* SW2 12/08/03 753 20 10 -1257 0 00 1,190 104 40 2 109 5,820 h 13 9 SW2 12/08/03 753 <0 5* SW2 03/02/04 753 1862 -1 l 09 0 00 1,080 8 0 320 9 0 5,710 h <5* SW2 06/28/04 753 1992 -1239 000 -- -- -- -- -- -- SW2 06/29/04 753 -- -- -- 1,190 140 370 220 4,680 h <0 5* SW2 09/27/04 753 2074 -1321 000 -- -- -- -- -- -- SW2 j 09/28/04 7 53 -- -- -- 1,680 225 77 5 375 9,730 h <0 5* SW2 12/01/04 753 2033 -12 80 000 -- -- -- -- -- -- SW2 12/02/04 753 -- -- -- 1,290 16 2 548 237 2,570 h <0 5* SW2 03/24/05 753 1840 -10 87 000 564 7 4 184 7 7 2,260 h <0 5* SW2 06/22/05 753 1846 -10 93 000 -- -- -- -- -- -- g SprojeclsM9421masteAwplq 120513942gw xis page 43 of 59