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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(µg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) _Afect) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE RW4 06/28/04 786 <0 5* RW4 09/27/04 786 2191 -1405 000 994 276 111 112 1,590 h 292 RW4 09/28/04 786 <0 5* RW4 12/01/04 786 2152 -1366 000 941 292 1 l2 134 1,470 h 322 RW4 12/01/04 786 <0 5* RW4 03/24/05 786 1955 -1169 000 -- -- -- -- -- -- RW4 03/25/05 786 -- -- -- 980 290 880 100 1,200 h 25 RW4 03/25/05 786 <0 5* RW4 06/22/05 786 1948 -1162 000 100 239 928 104 1,400 h 96 RW4 06/22/05 786 <1* RW4 10/12/05 786 2096 -13.10 0.00 81 23 74 92 1,400 h <12 SWI 02/17/94 -- Not accessible since 02/17/94 SWI 02/17/95 2801 Air sparging well--samples not collected SWI 05/11/95 -- -- Air sparging well--samples not collected SWI 08/24/95 -- -- Air sparging well--samples not collected SWI 10/19/95 -- Air sparging well--samples not collected SWI 02/13/96 -- -- Air sparging well--samples not collected SWI 04/18/96 -- -- Air sparging well--samples not collected SWI 08/08/96 -- Air sparging well--samples not collected SWI 11/04/96 -- 2424 -- 000 2,400 3,100 290 2,800 25,000 <250 SWI 12/04/01 825 -- -- -- -- -- -- -- -- -- S W 1 03/05/02 825 -- -- -- -- -- -- -- SWI 06/11/02 825 -- -- -- -- -- -- -- -- SW 1 09/10/02 825 -- -- -- -- -- -- -- -- -- SWI 12/18/02 825 -- -- -- SWI -SWI 03/24/03 825 19 15 -1090 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 SW 1 09/17/03 825 <5* g 1projects1739421masterlwplq 100513942gw x1s Page 41 of 58