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I TABLE 5 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles -Roek Stockton, California . Page 7 of 9 (in parts per billion) 1 > Well Date Methanol Ethanol TBA MTBE DIPE ETBE TAME 1,2 DCA EDB MW10 NOV-00 <500 <250 <50 <5 0 <5 0 <5 0 <5 0 29 <5 0 Cont'd Mar-01 <500 <250 <20 42 <20 <2 0 <2 0 17 <2 0 May-01 -- -- <20 20 <20 <2 0 <2 0 78 <2 0 ' Aug-01 -- -- Not Sampled Dec-01 <20 10 <2 01 <20 <2 0 16 <2 0 Feb-02 Not Sampled ' May-02 -- -- <20 39 <20 <2 0 <2 0 16 <2 0 Aug-02 Not Sampled Nov-02 -- -- <20 4 2 <2 0 <2 0 <2 0 12 <2 0 t Feb-03 -- - Not Sampled MWl l Nov-97 12 <5 0 94 <10 <1 0 -- -- Feb-98 -- -- <100 <5 0 16 <5 0 <5 0 -- -- ' May-98 38 <5 0 11 <10 <1 0 =� =- Aug-98 44 <10 28 <10 <10 Nov-98 -- -- 35 <10 26 <10 <10 -- -- Feb-99 _- -- 18 <10 1 22 <10 <10 =_ -- May-99 <50 <5 0 16 <5 0 <5 0 Aug-99 -- <50 <5 0 <5 0 <5 0 <5 0 -- -- ' Nov-99 <50-- - __ <50 <50 <5 0 <5 0 <5 0 Feb-00 May-00 <500 <250 <50 <5 0 95 <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 <500 <250 <50 <5 0 <5 0 <5 0 <5 0 10 <5 0 Mar-01 <500 <250 <20 <2 0 <2 0 <2 0 <2 0 42 <2 0 ' May-01 -- -- <20 <20 <2 0 <2 0 <2 0 86 <2 0 Aug-01 Not Sampled Dec-01 -- -- <20 31 1 <2 0 <2 0 <2 0 41 <2 0 ' Feb-02 -- -- Not Sampled May-02 <20 L 7 1 <2 01 <2 0 <2 0 26 <2 0 Aug-02 Not Sampled ' Nov-02 -- 4a 23 1 <20 1 <2 0 <20 58 <2 0 Feb-03 Not Sampled MW12 Nov-97 -- -- 42 <5 0 70 <1 0 <10 -- -- Feb-98 -- 110 <5 0 <5 0 <5 0 <5 0 May-98 49 <5 0 19 <10 <10 Aug-98 -- -- 58 <1 0 34 <10 <10 -- -- ' Nov-98 Y- -- 45 <10 33 <10 <1 0 -- -- Feb-99 18 12 27 <1 0 <l 0 May-99 -- -- <50 <5 0 <5 0 <5 0 <5 0 -- Aug-99 =_ <50 <5 0 <5 0 <50 <5 0 -- Nov-99 <50 <5 0 <5 0 <5 0 <5 0 Feb-00 -- -- -- -- -- -- -- May-00 -Ma -00 -- -- -- -- -- -- -- --