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I TABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles - Roek Stockton,California Page 6 of 10 (in parts per billion) Weil Date Methanol Ethanol TBA MTBE DP'E )E1TBE TAME 1,2 DCA EDB MW6 Feb-00 -- -- <50 <50 <5 0 <5 0 <5 0 -- -- Cont'd May-00 <500 <250 <50 <5 0 <5 0 <5 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-O 1 -- -- <20 <2 0 t<2 0 <2 0 <2 0 <2 0 <2 0 Aug-01 Not Sampled Dec-01 -- -- <20 <20 1 <20 <20 <2 0 <2 0 <2 0 Feb-02 Not Sampled May-02 -- -- <20 <20 1 <20 <20 <2 0 <2 0 <2 0 Aug-02 Not Sampled Nov-02 -- -- <20 <2 0 <2 0 <20 <2 0 6.2 <2 0 Feb-03 Not Sampled May-03 -- -- <20 <2 0 <2 0 <2 0 <2 0 <2 0 <20 Aug-03 Not Sampled MW7 Nov-97 -- -- <5 0 <5 0 <1 0 <1 0 <1 0 -- -- Feb-98 -- -- <100 <5 0 <5 0 <5 0 <5 0 -- -- • May-99 == <50 <5 0 <5 0 <5 0 <5 0 Aug-99 <50 <5 0 <5 0 <5 0 <5 0 Nov-99 -- -- <50 12 <5 0 <5 0 <5 0 -- -- Feb-00 -- -- <50 20 <5 0 <5 0 <5 0 -- -- May-00 <500 <250 <50 33 <5 0 <5 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 1 12 <5 0 <5 0 <5 0 <5 0 <5 0 Mar-01 <500 <250 <20 39 <2 0 <2 0 <2 0 <2 0 <2 0 May-O 1 -- -- <20 70 <2 0 <2 0 <2 0 <2 0 <2 0 Aug-01 -- <20 18 <2 0 <2 0 <2 0 <2 0 <2 0 Dec-01 Not Sampled Feb-02 -- -- <20 240 <2 0 <20 <2 0 <2 0 <2 0 May-02 Not Sampled Aug-02 -- -- <20 280 <2 0 <2 0 <2 0 <2 0 <2 0 Nov-02 Not Sampled Feb-03 -- -- <20 110 <2 0 <2 0 <2 0 <2 0 <2 0 May-03 Not Sampled Aug-03 -- -- <20 68 <2 0 <2 0 <2 0 <2 0 <2 0 MW8 Nov-97 -- -- <5 0 <5 0 4.2 <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 -- --- Ma -00 <500 <250 <50 <5 0 <5 0 <5 0 <5 0 <5 0 1 <5 0