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I ' TABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles -Rock Stockton,Callfolnla Page 5 of 6 ' (in parts per billion) Well Date Methanol:Ethanol TBA, MTBE DIPE ME TAME 14 DCA EDIR MW 10 Nov-97 -- — 15 <5 0 7 6 <1 0 <1 0 -- -- Feb-98 - - <100 <5 0 <5 0 <50 <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 Q50 <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-DO <500 <250 <50 <5 0 <5 0 <5 0 <5 0 29 <5 0 i ' Mar-01 <500 Q50 <20 42 <2 0 <2 0 Q 0 17 Q O May-01 QO 20 Q0 Q Q0 78 QO Aug-01 Not Sampled ' Dec-01 - -- <20 i0 Q 0 1 <2 0 Q 0 16 Q 0 Feb-02 Not Sampled MW 11 Nov-97 — -- 12 <5 0 1 94 <1 0 <l 0 -- Feb-98 - -- <100 <5 0 16 <5 0 <5 0 - -- May-98 -- -- 38 <5 0 11 <1 0 <1 0 -- -' Aug-98 44 <10 28 <10 <10 Nov-98 - - 35 <10 26 <10 <10 - - Feb-99 - -- 18 <1 0 22 <1 0 <10 — - ' May-99 -- — <50 <5 0 16 <5 0 <5 0 = -- Au9-99 — - <50 <5 0 <5 0 <5 0 <5 0 Nov-99 -- -- <50 <5jo <5 0 <5 0 <5 0 -- -- ' Feb-00 May-DO <500 <250 <50 <59 5 <5 0 <5 0 27 <5 0 Aug-00 <500 <250 <50 <5 <5 0 <5 0 <5 0 37 <5 0 Nov-00 <500 <250 <50 <5 <5 0 <5 0 <5 0 10 <5 0 ' Mar-O 1 <500 <250 <20 <2 0 Q 0 120 <2 0 42 <2 0 May-01 QO <20 <20 <20 Q0 86 <20 Aug-01 Not Sampled ' Dec.-01 — -- Q0 31 1 <20 <2 0 <2 0 4 1 Q 0 Feb-02 Not Sampled MW12 Nov-97 - -- 42 <5 0 70 1 <1 0 <1 0 -- Feb-98 - -- 110 <5 0 <5 0 <5 0 <5 0 - - t 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 33 <l 0 <1 0 - - Feb-99 -- -- 18 12 27 <1 0 <1 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 <5 0 <5 0 <5 0 <5 0 -- - ' Feb 00 - -- -- -- -- -- -- - May-00 Aug-00 <500 <250 <50 <5 0 <5 0 <5 D 1 <50 35 <5 0 Nov-00 <500 Q50 <50 <5 0 <5 0 <5 0 <5 0 21 <5 0 ' Mar-01 <500 <250 <20 13 <2 0 <2 0 Q 0 81 <2 0 May-01 QO 34 Q 0 <2 0 <2 0 98 <2 0 Aug-01 - - <20 48 <2 0 <2 0 <2 0 13 Q 0 Dec-01 - -- Not Sampled . Feb-02 <20 200 1 Q O 1 Q 0 1 Q Q O 19 O 1