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TABLE 3 <br /> ' OXYGENATED COMPOUNDS IN GROUNDWATER <br /> Knowles - Roek <br /> Stockton, California <br /> • Page 7 of 7 <br /> (In parts per billion) <br /> Well Date Methanol Ethanol TSA MTBE DIPS ETBE TAME 1,2 DCA EDB <br /> MW12 Aug-00 <500 <250 <50 <5 0 <5 0 <5 0 <5 0 35 <5 0 <br /> Cont Nov-00 <500 <250 <50 <5 0 <5 0 <5 0 <5 0 21 <5 0 <br /> Mar-01 <500 <250 <20 13 <2 0 <2 0 <2 0 81 <2 0 <br /> May-01 -- -- <20 34 <2 0 <2 0 <2 0 98 <2 0 <br /> Aug-01 -- <20 48 <2 0 <2 0 <2 0 13 <2 0 <br /> Dec-01 Not Sampled <br /> Feb-02 -- -- <20 200 <2 0 1 <2 0 <2 0 19 <2 0 <br /> May-02 Not Sampled <br /> Aug-02 -- -- <20 110 <2 0 1 <2 0 <2 0 19 <2 0 <br /> MW13 Nov-97 -- -- <50 <5 0 <5 0 <5 0 <5 0 -- -- <br /> Feb-98 -- -- <500 <30 <30 <30 <30 -- -- <br /> May-98 -- -- <600 <60 <60 <60 <60 -- -- <br /> Aug-98 -- -- <250 <50 <50 <50 <50 -- -- <br /> Nov-98 -- -- <500 <100 <100 <100 <100 -- -- <br /> Feb-99 -- -- <5,000 <100 <100 <100 <100 -- -- <br /> May-99 -- -- <50 <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 <2,000 <200 <200 <200 <200 <200 <200 <br /> Mar-01 <50,000 <25,000 <2,000 <200 <200 <200 <200 <200 <200 <br /> May-01 -- -- <2,000 <200 <200 <200 <200 <200 <200 <br /> Aug-01 <br /> Dec-01 <br /> Feb-02 Not Sampled <br /> May-02 <br /> Aug-02 <br /> MW14 Mar-01 <50,000 <25,000 <2,000 24,000 <200 <200 <200 <200 <200 <br /> May-01 -- -- <5,000 15,000 <500 <500 <500 <500 <500 <br /> Aug-Ol -- -- <400 3,100 <40 <40 <40 <40 <40 <br /> Dec-01 -- -- <500 34,000 <50 <50 <50 370 <50 <br /> Feb-02 -- -- <11000 70,000 <100 I <100 <100 <100 <100 <br /> May-02 -- -- <10,000 81,000 <1,000 <1,000 <1,000 <1,000 <1,000 <br /> Aug-02 -- -- <10,000 140 000 <1,000 <1 000 <1,000 I <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 /> DIPE - Dr-isopropyl ether <br /> ETRE = 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 DC 1,2 Dichloroethane <br /> EDB Ethylenedibronude <br /> < Less than the indicated detection]unit <br /> * = Resampled 12/16/97 <br /> ** = Amended result (Argon Laboratory corresp, 1217100) <br />