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i TABLE 3 1 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles -Rock Stockton, California Page 7 of 9 (in parts per billion) Well Date MethanolEthanol TBA I MTBE DIPE ETBE TAME 1,2 DCA EDB MW10 Nov-97 -- 15 j <5 0 76 <1 0 <1 0 -- -- Feb-98 -- -- <100 <5 0 <5 0 <5 0 <5 0 -- -- Nov-99 -- -- <50 <5 0 <5 0 <5 0 <5 0 -- -- Feb-00 -- -- <50 <5 0 <5 0 <5 0 <5 0 -- May-00 <500 <250 <50 <5 0 <5 0 <5 0 <5 0 19 <5 0 Aug-00 <500 <250 <50 <5 0 <5 0 <5 0 <5 0 23 <5 0 Nov-00 1 <500 <250 <50 <5 0 <5 0 <5 0 <5 0 29 1 <5 0 Mar-01 <500 <250 <20 42 <2 0 <2 0 <2 0 17 <2 0 May-01 -- -- <20 20 <2 0 <2 0 <2 0 78 <2 0 Aug-01 Not Sampled Dec-01 -- -- <20 10 <2 O <2 0 <2 0 16 <2 0 Feb-02 Not Sampled May-02 -- <20 _39 <2 0 1 <2 0 <2 0 16 <2 0 Aug-02 Not Sampled Nov-02 -- -- <20 42 1 <2 0 1 <2 0 <2 0 12 <2 0 Feb-03 Not Sampled May-03 -- -- <20 2 5 <2 0 <2 0 <2 0 12 <2 0 M W 11 Nov-97 -- -- 12 <5 0 94 <1 0 <1 0 -- -- Feb-98 =� " <100 <5 0 16 <5 0 <5 0 == =- May-98 38 <5 0 11 <1 0 <10 Aug-98 -- -- 44 <10 28 <10 <10 -- -- Nov-98 -- -- 35 <10 26 <10 <10 -- -- Feb-99 -- -- 18 <10 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 <5 0 <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 1 <5 0 Mar-O 1 <500 <250 <20 <2 0 <2 0 <2 0 <2 0 42 <2 0 May-O 1 -- -- <20 <2 0 <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 71 1 <2 0 1 <2 0 <2 0 26 <2 0 Aug-02 Not Sampled Nov-02 -- -- <20 23 <2 01 <2 0 <2 0 58 <2 0 Feb-03 Not Sampled May-03 I <20 26 29 <2 0 <2 0 10 <2 0 MW12 Nov-97 -- 42 <5 0 70 <1 0 <1 0 -- -- Feb-98 =_ -- 110 <5 0 <5 0 <5 0 <5 0 May-98 49 <5 0 19 <1 0 <1 0 Aug-98 -- -- 58 <1 0 34 <1 0 <1 0 -- -- Nov-98 -- -- 45 <1 0 1 33 <1 0 1 <10 -- --