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Table 2 Groundwater Analytical Results -Oxygenate Compounds Former Unocal Service Station No 2859 1665 Pacific Avenue Stockton, California WELL fD DATE ETHANOL TBA MtBE DIPE ETBE TAME 1,2-DCA EDB (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (uga) (ug/L) MW-1 03/06/98 ND ND ND ND ND ND — -- 06118/98 ND ND ND ND ND ND -- — 08/31/98 ND ND ND ND ND ND — -- 12/04/98 ND ND ND ND ND ND — -- 02/04/99 ND ND 23 ND ND ND -- -- 11/26/03 -- <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 02126104 -- <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 i 04/05/04 -- <5 0 <1 0 <0 50 <0 50 <0 50 <0 50 <0 50 07/06/04 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 MW-2 03/06/98 ND ND ND ND ND ND -- -- 06/18/98 ND ND 21 ND ND ND -- -- 08/31/98 ND' ND' ND' ND' ND' ND' -- -- 12/04/96 ND' ND' ND' ND' ND' ND' -- -- 02/04/99 ND ND ND ND ND ND -- -- 11/28/03 -- <50 <0 50 <0 50 <050 <0 50 <0 50 <0 50 02/26/04 -- <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <050 04/05/04 -- <5 0 <1 0 <0 50 <0 50 <0 50 <0 50 <0 50 07106104 -- <50 <0 50 <0 50 <0 50 <050 <0 50 <0 50 MW-3 03/06/98 ND ND 29 ND ND ND -- -- 06/18/98 ND ND ND ND ND ND -- -- 08/31/98 ND ND ND ND ND ND -- -- 12/04/98 ND ND ND ND ND ND 02/04/99 ND ND ND ND ND ND -- -- 11/28/03 -- <5 0 <0 50 <0 50 <050 <0 50 <0 50 <0 50 02/26/04 -- <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 04/05/04 -- <5 0 <1 0 <0 50 <050 <0 50 <0 50 <0 50 06940-357 1 of 11 ENSR Corporation