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' TABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles-Rock Stockton,California ' Page 2 of 12 (in parls per billion) E• Well Date. Methanol Ethanol TSA. .MTBE DIPE 1 TBE: TAME 1,2 DCA EBB VW3 Nov-02 <20 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 ' Cont'd Feb-03 <]00 <10 <to <to <to <10 <10 May-03 Not Sampled Aug-03 <200 <20 <20 <20 <20 <20 <20 ' Nov-03 Not Sampled Feb-04 <200 <20 <20 <20 <20 <20 <20 May-04 Not Sampled Aug-04 <40 55 <4.0 1 <4.0 1 <4.0 L <4.0 1 <4.0 ' Nov-04 Not Sampled Feb-05 <200 51 <20 <20 1 <20 <20 <20 May-OS Aug-05 Not Sampled ' V W4 Nov-97 -- <250 <50 <50 <50 <50 == Feb-98 <100 <5.0 <5.0 <5.0 <5.0 Feb-00 <50 <5.0 20 <5.0 <5.0 - May-00 <500 <250 <50 <5.0 <5.0 <5.0 <5.0 34 <5.0 ' Aug-00 <500 <250 <50 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 Nov-00 <1,000 <SDO <100 <10 <10 <10 <10 130 <10 Mar-01 <2,500 <1,250 <100 <10 <10 <10 <10 190 <10 May-01 -- <40 <4.0 <4.0 <4.0 <4.0 270 <4.0 ' Aug-01 Not Sampled Dec-01 <20 <2.0 <2.0 <2.D <2.0 97 1 <2.0 Feb-02 Not Sampled May-02 -- <20 <2.0 <2.Q <2.0 110 <2.0 Aug-02 Not Sampled Nov-02 <20 <2.0 <2.0 4.0 Q.0 48 <2.0 Feb-03 Not Sampled ' May-03 -- <20 <2.0 <2.0 <2,0 <2.0 75 <2.0 Aug-03 Not Sampled Nov-03 <20 <2.0 <2.0 <2.0 <2.0 30 <2.0 Feb-04 Not Sampled ' May-04 -- -- <20 L <2.0 1 <2.0 <2.0 <2.0 60 <2.0 Aug-04 Not Sampled Nov-04 <20 <2.0 <2.0 <2.0 <2.0 49 <2.0 Feb-05- Not Sampled ' Aug-05 VW5 Feb-00 <54 <5.0 <5.0 <S.D <5.0 -- -- May-00 <500 <250 <50 <5.0 <5.0 6.0 <5.0 <5.0 <5.0 Aug-00 <500 <250 <50 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 ' Nov-00 <500 <250 <50 <5.0 <5.0 <5.0 <5.0 <5,0 <5.0 Mar-01 <500 <250 <20 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 May-01 <20 <2.0 1 <2.0 <2,0 <2,0 <2.0 <2.0 Aug-01 Not Sampled ' Dec-01 <20 <2.0 <2.0 <2.0 <2.0 <2,0 <2.0 Feb-02 Not Sampled May-02 <20 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 Aug-02- Not Sampled ' Aug-05 __ -- -_ VWfi Nov-97 <670 <135 <135 <l35 <135 Feb-98 <500 <30 <30 <30 <30 Feb-00 <250 <50 <50 <50 <SD ' Ma -00 <l0 60=0-0 <5,000 <1000 <100 <100 <100 <100 <]00 <100 •