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Tab Groundwater Analytical Res Oxygenate Compounds Former Tosco(Unocal) Service Station#6981 4707 Pacific Avenue Stockton,California WELL I'D DATE METHANOL ETHANOL TBA MTBE RIPE ETBE TAME 1,2-DCA EDB (PPM) (ppb) (pp b) (Ppb) (Ppb) (ppb) (ppb) (PPh) (Pb) VW-3 07/21/98 <500 <100 <2 0 <2 0 <2 0 <2 0 -- -- -- (conl) 10/14/98 <5Q0 <100 <2 0 <2 0 <2 0 <2 0 -- -- -_ -- 01/25-26/99 - <500 <100 1,300 <2 0 < <2 0 2 0 041191-20!99 - <5 000 <1,000 890 <20 <20 <20 - -- 07/15-16/99 "- <5,000 4,900 <100 <100 <100 - -- <20 -- <1,000 850 <20 <20 10125-26199 -- -' 01127-28100 -- -- <2,000 2,500 <40 <40 <40 ' 06/26-27100 -- -- <250 384 <5 00 <5 00 <5 00 - -- <20 09122-23100 <100 <5,000 <500 2,400 <20 <20 <20 <20 12126-27100 -- <1 000 <100 104 <2 00 <2 00 <2 00 -- -- 03/07-08101 -- <1,000 <100 333 <2 00 <2 00 <2 00 <2 00 <2 00 06126-27/01 -- <1,000 <100 41 <2 0 <2 0 <2 0 <2 0 <2 0 09112-13101 -- <1,000 <100 45 <2 0 <2 0 <2 0 <2 0 <2 0 12/12-13/01 -- <500 <20 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 03120-21/02 <500 <100 <z a <2 0 <2 0 <2 0 <2 0 <2 0 -- ' 06106-07102 -- <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 09130102 - <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 12130-31102 - <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 03/29-30103 -- <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 n6/25-26/01 <500 <100 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 i 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 01 -<2 0 -- <500 170 <2 0 <2 0 - <2 0 07/21/98 -- -- -- 10/14/98 <16,500 <3,300 <66 <66 <66 <66 ' - -- i 01125-26199 -- <500 610 15 <2 0 <2 0 <2 0 -- -- 04/19/-20/99 - <2,500 <500 15 <10 <10 <10 -- -- 07115-16199 -- -- 440 19 <10 <10 <10, -- -- 10125-26199 -- -- 260 27 <2 0 <2 0 <2 0 - -- 01/27-28100 -- -- 170 51 <2 0 <2 0 <2 0' - -- 06l26-27100 -- - 1 080 1,110 <20 0 <20 0 <20 0 -_ -- 6981 xls/4180139 17 Aeof06126101