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TABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles -Roek Stockton, California i Page 1 of 9 (in parts per billion) Well Date Methanol Ethanol FTBA I MTBE DIPE ETBE TAME1,2 DCA EDB V W 1 Feb-98 -- -- <100 <5 0 <5 0 <5 0 <5 0 -- -- Feb-00 -- -- 670 <50 <50 <50 <50 -- May-00 <50,000 <25,000 <5,000 <500 <500 <500 <500 <500 <500 Aug-00 <25,000 <12,500 <2,500 <250 <250 <250 <250 <250 490** Nov-00 <40,000 <20,000 <4,000 <400 <400 <400 <400 <400 1,200 Mar-01 <100,000 <50,000 <4,000 <400 <400 <400 <400 <400 590 May-01 -- -- <2,000 <200 <200 <200 <200 390 1,200 Aug-01 -- -- <2,000 <200 <200 <200 <200 630 800 Dec-01 Feb-02 Not Sampled May-02 -- -- <10,000 <1,000 <1,000 <1,000 <1,000 <1,000 <1,000 Aug-02 -- -- <10,000 <1,000 <1,000 <1,000 <1,000 <1,000 <1,000 Nov-02 Not Sampled Feb-03 -- -- <2000 <200 <200 <200 <200 <200 930 May-03 Not Sampled VW2 Aug-00 <10,000 <5,000 <1,000 <100 <100 <100 <100 <100 <100 Nov-00 <4,000 <2,000 <400 <40 <40 <40 <40 <40 <40 Mar-OI <10,000 <5,000 <400 <40 <40 <40 <40 <40 <40 . May-01 -- -- <200 <20 <20 <20 <20 <20 <20 Aug-01 Not Sampled Dec-01 -- -- <400 490 <40 <40 <40 <40 <40 Feb-02 -- -- <400 <40 <40 <40 <40 <40 <40 May-02 -- -- <400 <40 <40 <40 <40 <40 <40 Aug-02- Not Sampled May-03 VW3 Nov-97 -- -- <100 <20 <20 <20 <20 -- -- Feb-98 -- -- <100 <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 <5 0 <50 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 <2,500 <1,250 <100 <10 <10 <10 <10 <10 <10 May-01 -- -- <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 Aug-01 -- -- <40 <4 0 <4 0 <4 0 <4 0 <4 0 <4 0 Dec-01 Not Sampled Feb-02 -- -- <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 O May-02 Not Sampled Aug-02 Nov-02 -- -- <20 <2 0 1 <2 0 1 <2 0 <2 0 <2 0 <2 0 Feb-03 -- -- <100 <10 <10 <IO <10 <10 <f0 May-03 Not Sampled