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Table 2 Groundwater Analytical Results-Oxygenate Compounds Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL ID DATE METHANOL ETHANOL TBA MTBE DIPE ETRE TAME 1,2-DCA EDB (PPM) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) MW-1 12/08/97 WELL PAVED OVER -- -- -- -- -- - - 03l05198 -- <500 <100 20 <20 <20 <2 0 -- -- 05/27/98 -- <500 <100 30 <20 <20 <2 0 -- -- 07/21/98 1,500 <100 27 <20 <20 <2 0 10/14/98 -- <500 <100 20 <20 <20 <2 0 01/25-26199 -- <500 <100 53 <20 <2 0 <2 0 --' -- 04119/-20/99 -- <500 <100 24 <2 0 <2 0 <20 07/15-16/99 -- -- <100 <20 <2 0 <2 0 <20 - - 10/25-26/99 -- -- <100 38 <2 0 <2 0 <20 - -- 01/27-28100 -- -- <100 30 <2 0 <2 0 <2 0 -{ -- 06126-27100 -- -- <100 <2 00 <2 00 <2 00 <2 00 -- 09/22-23/00 <1 00 <500 <50 <20 <2 0 <2 0 <2 0 <2 0 <2 0 12126-27100 -- <1,000 <100 <2 00 <2 00 <2 00 <2 00 -- -- 03/07-08/01 -- <1,000 <100 <2 00 <2 00 <2 00 <2 00 <2 00 <2 00 06/26-27101 -- <1,000 <100 <20 <2 0 <2 0 <2 0 <20 <2 0 09112-13/01 -- <1,000 <100 <2 0 <2 0 <20 <2 0 <20 <2 0 12/12-13/01 - <500 <20 <10 <10 <10 <10 <10 <10 01/20-21102 -- <500 <100 <2 0 <2 0 <20 <2 0 <20 <2 0 j 06/06-07/02 -- <500 <100 <2 0 <20 <20 <2 0 <20 <2 0 09/30/02 -- <500 <100 <2 0 <2 0 <20 <20 <20 <2 0 i MW-2 12/08/97 20 <1,700 <330 390 <6 7 <6 7 <6 7 -- -- 03/05/98 -- <10,000 <2,000 300 <40 <40 <40 - -- 05/27/98 - <10,000 <2,000 270 <40 <40 <40 -- -- 07/21/98 -- <500 <100 180 <2 0 <2 0 <2 0 - -- 10/14/98 -- <2,500 <500 190 <10 <10 <10 - -- 01/25-26/99 -- <500 <100 170 <2 0 <2 0 <20 -- -- 041191-20199 -- <1,000 <200 180 <40 <4 0 <4 0 -- 07/15-16199 -- -- <100 180 <2 0 <2 0 <2 0 -- -- 10/25-26199 -- - <500 200 <10 <10 <10 - 01/27-28/00 - -- <100 140 <2 0 <2 0 <2 0 -- -- i A*130102 6991 x1s13$