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1111111_ 1111_ 111_ 111_ 1_ 1_ 11� 1_ 1_ I_ 1111111- 11111111111111 ]11111111111111 Illllllllllll1 1111 1_ ]ll� Illlllllllll, TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA Casing Depth Groundwater LPH _ Concentration(_µg1[,) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) _(feet) (feet) _ (feet) Benzene Toluene benzene _Xylenes TPH-g MTBE RW4 08/19/98 7 86 <12* RW4 11/18/98 786 1798 -1012 000 300 480 400 970 5,600 <25 RW4 03/30/99 786 RW4 05/05/99 7 86 RW4 08/20/99 7 86 RW4 12/06/99 786 RW4 02/29/00 7 86 -- -- _- -- -- -- -- -- - RW4 05/16/00 786 1520 -734 000 5 6 57 220 363 2,500 21 RW4 09/11100 7 86 1795 -1009 000 5 7 5 8 1 7 7 7 550 <0 5 RW4 12/13/00 7 86 17 85 -999 000 5 6 0 88 1 7 4 4 820 <0 5 RW4 03/08/01 7 86 17 10 -924 000 <0 5 1 1 3 5 13 9 640 5 5 RW4 06/21/01 7 86 1833 -1047 000 3 6 081 1 3 251 350 6 4 RW4 06/21/01 786 <5* RW4 09/20/01 7 86 1958 -1172 000 <2 5 <2 5 <2 5 <2 5 270 <2 5 RW4 12/04/01 786 1947 -1161 000 190 76 320 349 2,600 <5* RW4 03/05/02 7 86 18 65 -1079 000 RW4 03/06/02 7 86 -- -- -- 198 740 316 304 2,350 h 200 RW4 03/06/02 786 <0 5* RW4 06/11/02 7 86 1913 -1127 0 00 108 470 230 246 2,520 h 190 RW4 06/11/02 786 <0 5* SWI 02/17/94 -- Not accessible since 02/17/94 SWI 02/17/95 -- 28 01 Air spargmg well--samples not collected SWI 05/11/95 -- -- Air sparging well--samples not collected SWI 08/24/95 - Air spargmg well--samples not collected SWI 10/19/95 -- - Air spargmg well--samples not collected SWI 02/13/96 -- -- Air spargmg well--samples not collected SWI 04/18/96 -- Air spargmg well--samples not collected SWI 08/08/96 -- Air spargmg well--samples not collected SWI 11/04/96 -- 2424 -- 000 2,400 3,100 290 2,800 25,000 <250 SWI 02/03/97 -- -- __ SW t 05/09/97 -- -- -- -- g\projects\73942\ntaster\wplgD6O2\39426w xis Page 32 of 43