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Table 2 1 Groundwater Analytical Results-Oxygenate Compounds Former Tocco(Unocal)Service Station##6981 4707 Pacific Avenue i Stockton,California WELL ID DATE METHANOL ETHANOL TBA MTBE DIPE ETRE TAME 1,2-DCA EDB (ppm) (p b) (ppb) (pp15) (Ppb) (ppb) (ppb) (pb) ( b) 1 i MW-2 10125-26199 -- <500 200 <10 <10 <10 -- 1' - (cant) 01/27-29/00 -- -- <100 140 <2 0 <2 0 <2 0 --= -' 06/26-27100 -- -- <100 879 <2 00 <2 00 OD -- 09122-23100 120 <500 <50 100 <20 <20 <2 0 <2 0 <2 0 <2 00 <2 00 <1 00Q <100 785 -- -- 12/26-27100 -- <2 00 <2 00 03/07-08/01 -- <1,000 <100 732 <2 00 <2 00 <2 00 i <2 00� 06/26-27101 -- <1,000 <100 47 <2 0 <2 0 <2 0 120 <2 0 09112-13101 -- <1,000 <100 62 <2 0 <2 0 <2 0 <2 0 - <2 0 12112-13/01 -- <500 <20 94 <10 <10 <10 <1011 <10 <500 <100 78 <2 0 <2 0 <2 0 <2 0 <2 0 03120-21102 -- , 06/06-07102 -- <500 <100 58 <2 0 <2 0 <2 0 <2 0 <40 09/30IO2 <1 Q,Q00 __ <2,000 60 <40 <40 <40 t <40, 12130-31102 _- <2,500 <500 49 <10 <10 <10 <10I <10 � 03/29-30/03 -- <500 <100 31 <2 0 <2 0 <2 0 <2 0 <2 0 11 06125-26101 -- <500 <100 19 <2 0 <2 0 <2 0 <2 0 <2 0 �j ' 9 Mw-4 12/08/97 <1 0 <500 <100 75 <2 0 <2 0 <2 0 -- -- 03/05/98 -- <2,500 <500 34 <10 <10 <10 -- 05/27/98 -- <500 <100 32 <2 0 <2 0 <2 0 -- <500 <100 18 <2 0 <2 0 <2 0 07/21/98 --10/14/98 -- <500 <100 10 <2 0 <2 0 <2 001/25-26/99 -- <500 <100 10 <2 0 <2 0 <2 0 - -- 04/19/-20/99 - <500 <100 48 <2 0 <2 0 <2 0 07/15-16199 -- -- <100 46 <2 0 <2 D <2 0 -- 10/25-26/99 -- -- <100 33 <2 0 _ <2 0 <2 0 - -- 01127-28/00 -- -- <100 <2 0 <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 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 12126-27100 -- <1,000 <100 <2 00 <2 00 <2 00 <2 00 _ -_ 03107-08101 -- <1,000 <100 <2 00 <2 00 <2 00 <2 00 <2 0'0 <2 00 06/26-27101 -- <1,000 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 09/12-13/01 -- <1,000 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 C,9R! x!c 1�R A 126/03