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I <br /> TABLE 3 <br /> OXYGENATED COMPOUNDS IN GROUNDWATER <br /> Knowles -Roek <br /> Stockton, California <br /> Page 8 of 8 <br /> (In parts per billion) <br /> I <br /> Well Date Methanol Ethanol TBA I MTBE RIPE ETBE TAME 1,2 DCA EDB <br /> MW13 Nov-97 -- -- <50 <5 0 <5 0 <5 0 <5 0 -- -- <br /> Feb-98 -- -- <500 <30 <30 40 <30 - -- <br /> May-98 -- -- <600 X60 <60 <60 <60 -- -- <br /> Aug-98 -- -- <250 <50 <50 <50 <50 - -- <br /> Nov-98 -- -- <500 <I00 <100 <100 <100 -- -- <br /> Feb-99 -- -- <5,000 <100 <100 <I00 <100 - -- <br /> May-99 -- -- <50 1 <500 <50 <50 <50 -- -- <br /> Aug-99 -- -- <500 <50 <50 <50 <50 -- -- <br /> Aug-00 <10,000 <5,000 <1,000 <100 <100 <100 <100 <100 <100 <br /> Nov-00 <20,000 <10,000 4,000 400 400 <200 <200 400 <200 <br /> Mar-01 <50,000 <25,000 <2,000 <200 <200 400 400 <200 <200 <br /> May-01 -- -- <2,000 400 <200 <200 <200 <200 <200 <br /> Aug-01- <br /> Not Sampled <br /> Nov-02 <br /> MW14 Mar-01 <50,000 45,000 4,000 24,000 <200 <200 <200 <200 <200 <br /> May-01 - -- <5,000 15,000 <500 <500 <500 <500 <500 <br /> Aug-01 -- -- <400 3,100 <40 <40 <40 <40 <40 <br /> Dec-01 - - <500 34,000 <50 <50 <50 370 <50 <br /> Feb-02 -- -- <1,000 70,000 <100 <100 <100 <100 <100 <br /> May-02 -- -- <10,000 81,000 <1,000 <1,000 <1,000 <1,000 4,000 <br /> Aug-02 <10,000 140,000 <1,000 <1,000 <1,000 <1,000 <1,000 <br /> Nov-02 -- -- -L-<10,000 210,000 <1,000 <1,000 <1,000 <1,000 <1 000 <br /> NOTES <br /> Analyzed using modified EPA method 8260 <br /> Bold values indicate value at or above method detection limit <br /> D1PE = Di-isopropyl ether <br /> ETBE = Ethyl tert-butyl ether <br /> MTBE - Methyl tert-butyl ether <br /> TAME = tert-amyl methyl ether <br /> TBA = tert-butanol(tertiary butyl alcohol) <br /> 1,2 DCA = 1,2 Ihehloroetlme <br /> EDB = Ethylenedibromide <br /> < = Less than the indicated detection limit <br /> * = Resampled 12/16/97 <br /> ** = Amended result (Argon Laboratory corresp, 1217100) <br /> I <br />