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Table 2 Groundwater Analyticalis-Oxygenate Compounds R Farmer Tosco(Unoc Service Station#6981 4707 Pacific Avenue Stockton,California WELL ID DATE METHANOL ETHANOL TBA MTBE DIPS ETBE TAME 1,2-DCA EDB (PPM) (Ppb) (Ppb) (Ppb) (Ppb) (pp b) (ppb) (PP b) (ppb) MW-1 12/08/97 WELL PAVED OVER __ 03/05/98 - <500 <100 20 <2 0 <2 0 <2 0 - -- 05/27/98 -- <500 <100 30 <2 0 <2 0 <2 0 07/21/98 1,500 <100 27 <2 0 <2 0 <2 0 -- 10/14/98 <500 <100 20 <2 0 <2 0 <2 0 - -- 01/25-26199 -- <500 <100 53 <2 0 <2 0 <2 0 -- _-_- 04/19/-20/99 -- <500 <I00 24 <2 0 <2 0 <2 p 07/15-16/99 -- -- <100 <2 0 <2 0 <2 0 <2 0 -- 10/25-26/99 -- -- <100 38 <2 0 <2 0 <2 0 -- 01/27-28/00 -- -- <100 30 <2 0 <2 0 <2 0 -- 06/26-27100 -- -- <100 <2 00 <2 00 <2 00 <2 00 09/22-23100 <1 00 <500 <50 <20 <2 0 <2 0 <2 0 <2 0 <2 0 12126-27/00 -- <1,000 <100 <2 00 <2 00 <2 00 <2 00 03/07-08101 -- <1,000 <100 <2 00 <2 00 <2 00 <2 00 <2 00 <2 00 06/26-27/01 <1,000 <100 <2 0 <2 0 <2 <20 <20 <20 09/12-13/01 -- <1,000 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 12/12-13101 -- <500 <20 <10 <10 <10 <10 <10 <10 03/20-21/02 -- <500 <100 <2 0 <2 0 <2 0 <2 <2p <20 06106-07102 -- <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 09/30/02 -- <500 <100 <2 0 <2 0 <2 0 <2 0 20 <20 12/30-31/02 -- <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 03/29-30/03 -- <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 06/25-26/03 -- <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 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 -- <I0,000 <2,000 270 <40 <40 <40 -- 07/21/98 <500 <100 180 <2 0 <2 0 <2 0 - -- 10/14/98 -- <2,500 <500 I90 <10 <10 <10 -. 01/25-26/99 -- <500 <100 170 <2 0 <2 0 <2 0 -- 04/19/-20/99 -- <1,000 <200 180 <4 0 <4 0 <4 0 6981 xis/#180138 1 As of 06/26/03