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i I Table 2 Groundwater Analytical Results-Oxygenate Compounds Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL ID DATE METHANOL ETHANOL TBA MTBE DIPE ETRE TAME 1,2-DCA EAB (PPM) (Ppb) (PPb) (PPb) (ppb) (Ppb) (ppb) € (.Ppb) fppb) i MW-11 12/08/97 WELL PAVED OVER -- 03/05/98 03/05/98 -- -- -- -- -- -- -- 03/16/98 - <2,500 <500 <10 <10 <10 <10 - -- 05/27/98 -- <500 <100 17 <2 0 <2 0 <2 0 -- 07/21/98 -- <500 <100 <2 0 <2 0 <2 0 <2 0 -- - 10/14/98 -- <500 <100 <2 0 <20 <2 0 <2 0 -- -- 01/25-26199 -- <500 <100 <2 0 <2 0 <2 0 <2 0 -- -- 041191-20/99 -- <500 <100 <2 0 <20 <2 0 <2 0 -- -- 07/15-t6199 - -- <100 <2 0 <2 0 <2 0 <2 0 -- -- 10/25-26199 - <100 <2 0 <2 0 <2 0 <2 0 -- 01/27-28/00 - - <100 40 <2 0 <2 0 <2 0 -- - 06/26-27/00 -- -- <100 <2 00 <2 00 <2 00 <2 00 - -- 09122-23100 <100 <500 <50 <2 0 <2 0 <2 0 <20 <2 0 <2 0 12/26-27100 -- <1,000 <100 <2 00 <2 00 <2 00 <2 00 1-- -- t03/07-08/01 -- <1,000 <100 <2 00 <2 00 <2 00 <2 00 <2 00 <2 00 MW-14 08/21/99 -- <500 <100 110 <2 0 <2 0 <2 0 -- -- 10/25-26199 - -- <100 150 <2 0 <2 0 <20 11 <20 01/27-28100 -- - <100 170 <2 0 <2 0 <2 0 88 <20 06/26-27/00 -- -- <200 346 <4 00 <4 00 <4 00 188 <4 00 09122-23/00 <1 00 <500 <50 250 <2 0 <2 0 <2 0 10 <2 0 12126-27100 -- <1,610 <167 210 <3 34 <3 34 <3 34 614 <3 34 03/07-08101 -- <1,250 <125 198 <2 50 <2 50 <2 50 414 <2 50 MW-15 08/21/99 - <500 <100 20 <2 0 <2 0 <2 0 - 10/25-26199 - -- <100 72 <2 0 <2 0 <2 0 <2 0 <2 0 01/27-28100 -- - <100 72 <2 0 <2 0 <2 0 <2 0 <2 0 06126-27100 -- -- <100 523 <2 00 <2 00 <2 00 357 <2 0 I � 6981 x]s7#IT80138 A003108101