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' TABLE3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles-Rock Stockton,California ' Page 8 of 12 (ot purls per billion) ' W01 Date" "Methanol.: .Ethanol:: TBA MTBE" DipE"" ETBE TAME 1,2 DCA EDB-: MW9 Feb-02 <20 8.7 72.0 <2.0 <2.0 1 <2.0 4.0 ' Cont'd May-02 Not Sampled Aug-02 <20 8.2 1 <2.0 <2.0 <2.0 <2.0 12.0 Nov-02 Not Sampled ' Feb-03 1 <20 5.1 <2.0 <2.0 <2.0 <2.0 72.0 May-03 Not Sampled Aug-03 <20 21 1 <2.0 <2.0 <2.0 4.1 <2,0 Nov-03 Not Sampled ' Feb-04 -- <20 4.9 1 <2.0 <2.0 <2.0 <2.0 <2.0 May-04 Not Sampled Aug-04 <20 33 1 <2.0 4.0 <2.0 3.5 <2.0 Nov-04 Not Sampled ' Feb-05 -- <5.0 1.5 <0.5 <0,5 <0.5 <0,5 <0.5 May-05 Not Sampled Aug-05 MW10 Nov-97 l5 <5.0 7.6 <1.0 <1.0 -- Feb-98 - Feb-98 <100 <5.0 <5.0 <5.0 <5.0 Nov-99 <50 <5.0 <5.0 <5.0 <5.L- Feb-00 -_ <50 <5A <5.0 <5.0 <5.0 May-00 <500 <250 <50 <5.0 <5.0 <5.0 <5.0 19 <5.0 Aug-00 1 <500 <250 <50 <5.0 <5.0 <5.0 <5.0 23 <5.0 Nov-00 <500 <250 <50 1 <5.0 <5,0 <5.0 <5.0 29 <5.0 Mar-01 <500 <250 <20 4.2 <2.0 <2.0 <2.0 17 <2.0 May-OI -- -- 40 2.D <2.0 <2.0 <2.0 7.8 <2.0 Aug-01 Not Sampled Dee-01 <20 10 <2.0 <2.0 <2.0 Feb-02 Not Sampled ' May-02 - <20 3.9 <2.0 <2.0 <2.0 16 <2.0 Aug-02 Not Sampled Nov-02 <20L 4.2 <2.0 <2.0 <2.0 12 <2.0 Feb-03 Not Sampled ' May-03 <20 2.5 1 <2.0 <2.0 <2.0 12 72.0 Aug-03 Not Sampled Nov-03 <20 j 2.64.0 <2.0 Q.0 10 <2.0 Feb-04 Not Sampled ' May-04 <20 1 <2.0 1 <2.0 <2.0 <2.0 13 1 <2.0 Aug-04 Not Sampled Nov-04 <20 <2.0 <2.0 <2.0 <2.o 12 <2.0 Feb-05- ' Au -OS - Not Sampled MWII Nov-97 12 1 <5.0 9.4 1 <1.0 <1.0 Feb-98 -- <100 <5.0 16 <5.0 <5.0 May-98 38 <5.0 11 <1.0 <1,0 ' Aug-9844 <1.0 28 <]D <1.0 Nov-98 35 <1,0 26 <I.0 <1.0 Fcb-99 -- 18 <1.0 1 22 <1.0 I <1.0 May-99 - <50 <5.0 16 <5"0 <5.0 ' Aug-99 -- <50 <5.0 <5.0 <5.0 <5.0 Nov-99 <50 <5.0 <5.0 <5.0 <5.0 Feb-00 -- -_ -- May-00 <500 <250 <50 <5.0 9.5 <5.0 <5.0 27 <5.0 ' Aug-00 <500 <250 <50 <5.0 <5.0 <5.0 <5.0 37 <5.0 Nov-00 4 <500 50 <50 <5.0 <5.0 <5.0 p s i t