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4al 2Groundwater Analyticals-Oxygenate Compounds Former Tosco(Unocal) Service Station#/6981 I� 4707 Pacific Avenue Stockton,Califorma WELL 10 DATE METHANOL ETHANOL TBA. MTBE DIPE ETBE TAME 1,2-DCA EDB (Ppm) (Ppb) (ppb) (ppb) (Ppb) fppb) (ppb) (Ppb) (Ppb) VW-4 12/08/97 WELL CONNECTED TO VES -- -- -- -- -- -- -- 03/05/98 -- <500 <100 39 <2 0 <2 0 <2 0 -- 05/27/98 -- <1,250 <250 <5 0 <5 0 <5 0 <5 0 07/21/98 -- <500 170 <2 0 <2 0 <2 0 <20 10/14/98 -- <16,500 <3,300 <66 <66 <66 <66 -- -- 01/25-26/99 - <500 610 15 <2 0 <2 0 <2 0 -- -- 04/19/-20/99 -- <2,500 <500 15 <10 <10 <10 -- -- 07/15-16/99 -- 440 19 <10 <10 <10 - -- I 10125-26/99 - -- 260 27 <2 0 <2 0 <2 0 -- -- 01/27-28/00 -- -- 170 51 <2 0 <2 0 <2 0 -- -- 06/26-27/00 -- -- 1,080 1,110 <20 0 <20 0 <20 0 -- -- VW-4 09/22-23100 <1 00 <500 <50 160 <2 0 <2 0 <2 0 <2 0 <2 0 (cont) 12/26-27/00 -- <5,000 <500 172 <10 0 <100 <10 0 -- -- 03/07-08/01 -- <2,000 227 321 <4 00 <4 00 <4 00 <4 00 696 06/26-27/01 -- <17,000 <1,700 330 <33 <33 <33 <33 <33 I 09/12-13/01 -- <5,000 <500 310 <10 <10 <10 <10 <10 I 12/12-13/01 -- <1,000 <40 270 <2 0 <2 0 <2 0 <2 0 <2 0 03/20-21/02 -- <500 <100 36 <2 0 <2 0 <2 0 <2 0 <20 06/06-07/02 -- <500 <100 40 <2 0 <2 0 <2 0 <2 0 <2 0 09/30/02 DRY -- -- -- -- -- -- -- -- 12/30-31/02 DRY -- -- -- -- -- -- -- 03/29-30/03 -- <500 <100 <2 0 <2 0 <20 <2 0 <2 0 <2 0 06/25-26/03 NOT SAMPLED DUE TO INSUFFICIENT WATER — -- -- — -- VW-7 08/21/99 -- <2,500 <500 510 <10 <10 <10 10/25-26/99 -- -- <100 47 <2 0 <2 0 <2 0 <2 0 <2 0 01/27-28/00 -- -- <100 75 <2 0 <2 0 <2 0 <2 0 2 3 06/26-27/00 -- -- <2,000 41 1 <40 0 <40 0 <40 0 <40 0 <40 0 09/22-23/00 <1 00 <500 <50 35 <2 0 <2 0 <2 0 <20 <2 0 12/26-27/00 -- <50,000 <5,000 <100 <100 <100 <100 <100 <100 03/07-08/01 -- <20,000 <2,000 <40 0 <40 0 <40 0 <40 0 <40 0 <40 0 6981 xis/#180138 12 As of 06/26/03