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i TABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles -Roek Stockton, California • Page 6 of 9 (in parts per billion) Well 7Date Methanol Ethanol TBA MTBE DIPE ETBE TAME 1,2 DCA EDB MW7 May-01 I -- 1 <20 70 <2 0 <2 0 <2 0 <2 0 <2 0 Cont'd Aug-01 L -- -- <20 1$ <2 0 <2 0 <2 0 <2 t7O <2 0 Dec-01 Not Sampled Feb-02 -- -- <20 240 <2 0 1 <2 0 <2 0 <2 0 <2 0 May-02 Not Sampled Aug-02 -- -- <20 280 <2 0 1 <2 OT <2 0 <2 0 <20_ Nov-02 Not Sampled Feb-03 -- -- <20 110 <2 0 <2 0 <2 0 <2 0 <2 0 May-03 I Not Sampled MW8 Nov-97 -- -- <5 0 <5 0 42 <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 <5 0 <5 0 Aug-00 <2500 <1250 <250 <25 <25 <25 <25 <25 <25 Nov-00 <1,000 <500 <100 <10 <10 <10 <10 <10 <10 Mar-01 <1,000 <500 <40 <4 0 <4 0 <4 0 <4 0 <4 0 <4 0 May-01 -- -- <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 Aug-01 <20 <2 Q <2 0 <2 0 <2 0 <2 0 <2 0 Dec-01 -- -- <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 Feb-02 -- -- <200 <20 <20 <20 <20 <20 <20 May-02 -- -- <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 Aug-02 -- -- <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 Nov-02 -- -- <20 <2 0 <2 0 <2 0 <2 0 _ <2 0 <2 0 Feb-03 -- -- <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 May-03 -- -- <20 <2 0 1 <2 0 <2 0 <2 0 <2 0 <2 0 MW9 Nov-97 -- -- <5 0 93 14 <1 0 <10 -- -- Feb-98 -- -- <100 22 <5 0 <5 0 <5 0 -- Nov-99 -- -- <50 18 <5 0 <5 0 <5 0 -- -- Feb-00 -- -- <50 22 <5 0 <5 0 <5 0 -- -- May-00 <500 <250 <50 27 <5 0 <5 0 1 <5 0 68 <5 0 Aug-00 <500 <250 <50 15 <5 0 <5 0 <5 0 <5 0 <5 0 Nov-00 <500 <250 <50 13 <5 0 <5 0 <5 0 62 <5 0 Mar-O 1 <500 <250 <20 98 <2 0 <2 0 <2 0 3 1 <2 0 May-0 i -- -- <20 85 <2 0 <2 0 <2 0 <2 0 <2 0 Aug-01 -- -- <20 60 <2 0 1 <2 0 <2 0 <2 0 <2 0 Dec-01 Not Sampled Feb-02 -- -- <20 8 7 <2 01 <2 0 <2 0 <2.0 <2 0 May-02 Not Sampled Aug-02 -- -- <20 8 2 <2 01 <2 0 <2 0 <2 0 _ <2 0_ Nov-02 Not Sampled Feb-03 <20 51 1 <2 0 1 <2 0 <2 0 <2 0 <2 0 May-03 i Not Sampled I � I