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TABLE3 <br /> OXYGENATED COMPOUNDS IN GROUNDWATER <br /> Knowles-Rock <br /> Stockton,California <br /> Page 11 of I I <br /> (in parts per billion) <br /> 0 <br /> 41 <br /> VP, <br /> MW 15B Jan-03 <20 76 '0 <.O <2.0 5.5 <2.0 <br /> Feb-03 <20 86 <2.0 <2.0 <2.0 8.4 <2,0 <br /> May-03 <20 190 <2.0 <2.0 <2.0 9.0 <2.0 <br /> Aug-03 <20 320 <2.0 <2.0 <2.0 6.8 <2.0 <br /> Nov-03 <20 440 <2.0 <2.0 <2.0 6.4 <2.0 <br /> Feb-04 <20 400 <2.0 1 <2.0 <2.0 4.8 <2.0 <br /> Kay-04 <20 300 <2.0 <2.0 <10 6.0 <2.0 <br /> Aug-04 <40 450 <4.0 <4.0 <4.0 8.8 <4.0 <br /> Nov-04 <50 940 <5.0 <5.0 <5.0 6.8 <5.0 <br /> Feb-05 <50 600 <5.0 <5.0 <5.0 5.9 <5.0 <br /> MW15C Jan-03 <20 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <br /> Feb-03 <20 <2.0 <10 <2.0 <2.0 <2.0 <2.0 <br /> May-03 <20 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 <br /> Aug-03 <20 <10 <2.0 <2.0 <2.0 <2.0 <2.0 <br /> Nov-03 <20 <10 <2.0 <2.0 <2.0 <2.0 <2.0 <br /> Feb-04 <20 <2.0 <2.0 <2.0 <2.0 <2.0 <1.0 <br /> May-04 <20 <2.0 <2.0 <2.0 <2.0 2.4 <br /> Aug-04 <20 <2.0 <2.0 <2.0 <2,0 2.9 <2.0 <br /> Nov-04 <20 <2.0 <2.0 <2.0 <2.0 2.3 <2.0 <br /> Feb-05 <5.0 <0.5 <0.5 <0.5 <0.5 2.8 <0,5 <br /> MW16A Jan-03 <1000 2,500 <100 <100 <100 <100 <100 <br /> Feb-03 <400 2,900 <40 <40 <40 <40 <40 <br /> May-03 <400 1,300 <40 <40 <40 <40 <40 <br /> Aur,-03 <400 1,400 <40 <40 <40 <40 <40 <br /> Nov-03 <400 3,300 <40 <40 <40 <40 <40 <br /> Feb-04 <400 1,500 <40 <40 <40 <40 <40 <br /> May-04 <400 760 <40 <40 0 <40 <40 <br /> Aug-04 <1,000 580 <100 <100 <100 <100 <100 <br /> Nov-04 <100 960 <10 <10 <10 <10 <10 <br /> Feb-05 <500 4,700 <50 <50 <50 <50 <25 0 <br /> MW16B Jan-03 <200 170 <20 <20 <20 <20 <20 <br /> Feb-03 <400 260 <40 <40 <40 <40 <40 <br /> May-03 <400 87 <40 <40 <40 <40 <40 <br /> Aug-03 <400 120 <40 <40 <40 <40 <40 <br /> Nov-03 <400 140 <40 <40 <40 <40 <40 <br /> Feb-04 <400 <40 <40 <40 <40 <40 <40 <br /> May-04 <200 <20 <20 <20 <20 <20 <20 <br /> Aug-04 <1,000 <100 <100 <100 <100 <100 <100 <br /> Nov-04 <100 14 <10 <10 <10 <10 <10 <br /> Feb-05 <I 000 <100 <100 <100 <100 <100 -<1-00 <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 ler!-butyl ether <br /> TAME ien-amyl methyl ether <br /> TBA ierj-butanol(tertiary butyl alcohol) <br /> 1,2 DCA 1,2 Dichloroethane <br /> EDB E(hylenedibromide <br /> < Less than the indicated detection limit <br /> Resampled 12/16/97 <br /> Amended result (Argon Laboratory corresp,1217!90) <br />