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I <br /> ' TABLE 3 <br /> OXYGENATED COMPOUNDS IN GROUNDWATER <br /> Knowles-Roek <br /> ' Stockton,California <br /> Page 6 of 6 <br /> (rn parts er billion) <br /> ' Well 'Date Metha-Ralf Ethanol TBA MTBE DIPS ETBE TAME I,2 DCA EDE <br /> MW 13 Nov-97 -- <56 <5 0 <5 0 <5 0 <5 0 - -- <br /> Feb-98 — -- <500 <30 <30 <30 <30 -- -- <br /> ' <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-0i -- -- <2,000 <200 <200 <200 <200 <200 <200 <br /> Aug-01 <br /> ' Dec-0 <br /> Feb-02 Not Sampled <br /> May-02 <br /> ' MW 14 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-01 <400 3,100 <40 <40 <40 <40 <40 <br /> Dec-01 -- <500 34,000 <50 <50 <50 370 <50 <br /> ' <br /> Feb-02 <1,000<1,000 70,000 <100 <100 <100 <100 <100 <br /> Feb-02 <10,000 1 81,000 <1,000 1 <1,000 I <1 000 <1 440 <1 000 <br /> NOTES <br /> Analyzed using modified EPA method 8260 <br /> ' Bold values indicate value at or above method detection limit <br /> DIPE 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 BCA = 1,2 Dichloroethane <br /> ' EDB _ Ethylenedibromide <br /> < Less than the indicated detection limit <br /> ' Resampled 12/16/97 <br /> ## = Amended result (Argon Laboratory corresp, 12/7/00) <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> • <br /> i <br /> I <br />