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!I Table 2 Groundwater Analytical Results-Oxygenate Compounds Tosca(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL 1D DATE METHANOL ETHANOL TBA MTBE DIPS ETRE TAME 112-DCA EDB (PPM) (Ppb) b) (W) (ppb) (pleb) (Ppb) (Ppb) (Ppb) MW-11 12/08/97 WELL PAVED OVER 03/05/98 -- -- -- 03/16/98 - <2,500 <500 <10 <10 <10 <10 -- - 05/27/98 - <500 <100 17 <20 <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 -- -- 01/25-26/99 -- <500 <100 <2 0 <2 0 <2 0 <2 0 -- -- 04/19/-20199 - <500 <100 <2 0 <20 <2 0 <2 0 - i 07115-16/99 -- <100 <2 0 <2 0 <2 0 <2 0 -- -- 10/25-26/99 -- <100 <20 <2 0 <2 0 <2 0 -- -- OI/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 <1 00 <500 <50 <2 0 <2 0 <2 0 <20 <2 0 <2 0 12126-27100 -- <1,000 <100 <2 00 <2.00 <2.00 <2.00 -- -- I� MW-14 08/21/99 -- <500 <100 110 <2 0 <2 0 <2 0 -- -- 10/25-26/99 - -- <100 150 <2 0 <2 0 <2 0 11 <2 0 01127-28/00 -- - <100 170 <20 <2 0 <2 0 88 <2 0 06/26-27/00 -- -- <200 346 <4 00 <4 00 <4 00 1818 <4 00 09/22-23100 <1 00 <500 <50 250 <2 0 <2 0 <20 10 <2 0 12/26-27/00 -- <1,670 <167 210 <334 <3.34 <3 34 6 84 <334 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 01127-28/00 - -- <100 72 <2 0 <2 0 <2 0 <2 0 <2 0 06126-27/00 -- -- <100 523 <2 00 <2 00 <2 00 357 <2 0 09/22-23100 <1 00 <500 <50 14 <2 0 <2 0 <2 0 <2°0 <2 0 12/26-27/00 -- 4,000 <100 168 <2 00 <2 00 <2 00 <20'10 <2 00 i I 6981 x1*138 As2/27t00