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d Table 2 Groundwater Analytical Results-Oxygenate Compounds i Former Tosco(Unocal)Service Station#16981 I 4707 Pacific Avenue i Stockton,California WELL!D DATE METHANOL ETHANOL TBA MTBE D1PE ETBE TAME 1,2-DCA EDB (PPM) (p b) (p b) (ppb) (ppb) (ppb) (pp b) (pp b) (PP b) M W-6 12/08/97 <1 0 <500 <100 <2 0 <2 0 <2 0 <2 0 -- -- i <2 0 03/05!98 -- <500 <100 44 <2 0 <2 0 - <100 <20 <20 <20 <20 - 05/27/98 -- <500 <2 0 0 2 <2 0 ; -- - 07/21/98 -- <500 <100 <2 0 < <2 0 10/14/98 - <500 <100 <2 0 <2 0 <2 0 i - 01125-26199 - <500 <100 <2 0 <2 0 <2 0 <2 0 i -- � -- -- 041191-20/99 -- <500 <100 <2 0 <2 0 <2 0 <2 0 07115-16199 -- <100 <2 0 <2 0 <2 0 <2 0 i -- -- -- � -- -- 10/25-26199 -- - <100 27 <2 0 <2 0 <2 0 -- <100 <2 0 <2 0 <2 0 <2 0 -- 01/27-28/00 -- -- <2 00 <2 00 <2 00 - 06/26-27/00 -- -- <100 <z oa <1 00 <500 <2 0 <2 0 <2 0 <2 0 09122-23/Q0 <50 <2 00 4 Ofl <2 00 <2 00 1 -- <2 -- <1,000 <100 <1,OOQ <100 <2 00 <2 00 <2 00 <2 00 03107-08/01 - <2 00 00 <2 0 i<2 0 <2 0 06126-27/01 - <1,000 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 <I,000 <100 09112-13101 -- <2 0 <2 0 Q, � 12112-13101 I l 0 V <1 0 � <500 <20 <1 0 <1 0 <1 0 <1 0 i -- �< 03/20-21/02 -- <500 <100 <2 0 <2 0 <20 <20 20" <20 06106-07102 - <500 <100 <2 0 <2 0 <2 0 <2 0 I<2 0 <2 0 09/30/02 -- <500 <100 <2 0 <2 0 <2 0 <2 0 20 <2 0 12130-31102 -- <500 <100 <2 0 <2 0 <2 0 <2 0 I i2 0 <2 0 03/29-30103 -- <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 06/25-26103 -- <500 <100 <2 0 <2 0 <2 0 <2 0 I<2 0 <2 0 I I MW-7 12/08/97 <1 0 <500 <100 69 <2 0 <2 0 <2 0 -- 03/05/98 -- <500 <100 120 <2 0 <2 0 <2 0 -- it -- i 05!27198 -- <500 <100 53 <2 0 <2 0 <2 0 -- -- 07/21/98 -- <500 <100 22 <2 0 <2 0 <2 0 - - < < < -- 10/14/98 -- <500 <100 33 2 0 2 0 2 0 - I 01125-26199 -- <500 <100 35 <2 0 <2 0 <2 0 --04/19/-20/99 -- <500 <100 120 <2 0 <2 0 <2 0 - - 07/15-16/99 -- -- <200 320 <4 0 <4 0 <40 - - 6981 x10638 A,1026/03