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• T2 • Groundwater Analytical R is-Oxygenate Compounds Former Tosco(Unocal)Service Station#6981 4707 Pacific Avenue Stockton,California WELL ID DATE METHANOL ETHANOL TBA MTBE DIPE ETRE TAME 1,2-DCA EDB (Ppm) (Ppb) (Ppb) (ppb) (Ppb) (Ppb) (Ppb) (ppb) (Ppb). VW-3 12/08/97 <10 <500 <100 <20 <20 <20 <2 0 03/05/98 -- <1,200 <250 300 <5 0 <5 0 <50 05/27/98 <500 <100 <2 0 <2 0 <20 <2 0 -- 07/21/98 -- <500 <100 <2 0 <2 0 <2 0 <2 0 10/14/98 <500 <100 <2 0 <20 <20 <2 0 01/25-26/99 - <500 <100 1 300 <2 0 <2 0 <2 0 04/191-20/99 -- <5,000 <1,000 890 <20 <20 <20 07115-16/99 -- -- <5,000 4,900 <100 <100 <100 10/25-26199 -- <1,000 850 <20 <20 <20 01/27-28100 -- <2,000 2,500 <40 <40 <40 06126-27100 -- -- <250 384 <5 00 <5 00 <5 00 -- -- 09/22-23/00 <100 <5,000 <500 2,400 <20 <20 <20 <20 <20 12126-27100 -- <1,000 <100 104 <2 00 <2 00 <2 00 -- -- 03/07-09/01 -- <1,000 <100 333 <2 00 <2 00 <2 00 <2 00 <2 00 06/26-27/01 -- <1,000 <100 41 <2 0 <2 0 <20 <20 <2 0 09/12-13/01 -- <1,000 <100 45 <2 0 <2 0 <2 0 <20 <2 0 12112-13/01 <500 <20 <10 <10 <10 <10 <10 <10 03120-21102 -- <500 <100 <2 0 <20 <20 <2 0 <2 0 <20 06/06-07/02 <500 <100 <20 <2 0 <2 0 <20 <2 0 <20 09130!02 -- <500 <100 <2 0 <20 <2 0 <20 <2 0 <20 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 t 70 <20 <2 0 <2 0 <2 0 -- -- 10/14/98 -- <16,500 <3,300 <66 <66 <66 <66 -- -- 01/25-26199 -- <500 610 15 <2 0 <20 <20 - -- 04/19/-20199 -- <2,500 <500 15 <10 <10 <10 -- -- 07/15-I6/99 - -- 440 19 <10 <10 <10 -- -- 10/25-26199 -- -- 260 27 <2 0 <20 <2 0 --01/27-28/00 -- -- 170 ST <2 0 <2 0 <2 0 -- -- 6981 xlsf#180138 35 As of 09/30/02