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TABLE 3 ` OXYGENATED COMPOUNDS IN GROUNDWATER Knowles-Rock Stockton Califomta . Page 9 of 12 t<^par1s per billion) Well Date Methanol Ethanol TBA MTBE DIPS ETRE TAME 1,2 DCA EDB MW 12 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 <10 - Aug-98 -- 58 <1 0 34 <1 0 <10 Nov-98 45 <1 0 33 <10 <10 Feb-99 - 18 12 27 <10 <10 - 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 0 <5 0 35 <5 0 Nov-00 <500 <250 <50 <5 0 <5 0 <5 0 <5 0 21 <5 0 E <500 <250 <0 13 <2 0 <2 0 <2 0 81 <2 0 - -- <20 34 Q 0 <2 0 <2 0 98 <2 0 - -- <20 48 <2 0 <2 0 <2 0 13 <2 0 Dec-0I Not Sampled Feb 02 - <20 200 1 <2 0 <20 <2 0 19 <2 0 May-02 Not Sampled Aug-02 -- <20 110 <2 0 <20 <2 0 19 <2 0 Nov-02 Not Sampled Feb 03 <20 78 <20 <20 <2 0 18 <2 0 May-03 Not Sampled Aug-03 -- QO 60 <2 0 <2 0 <20 21 <2 0 Nov-03 Not Sampled Feb-04 <20 51 <2 0 <2 0 <2 0 16 <2 0 May-04 — -- Not Sampled Aug 04 QO 110 <0 <2 0 <2 0 23 <2 0 Nov 04 Not Sampled Feb-05 -- <5 0 71 <0 5E<�2 <0 5 17 <0 5 May 05 - <5 0 97 <0 5 <05 18 <0 5 Au -OS - -- Q0 280 <2 0 <2 0 16 <2 p Dec 05 - <20 390 <2 0 <2 0 16 <2 0 Mar-06 <10 520 <10 <10 18 <10 1 Jun 06 1 Not Sampled MW 13 Nov-97 -- <50 <5 0 <5 0 <5 0 <5 0 Feb-98 -- <500 <30 <30 <30 <30 —May 98 <600 <60 <60 <60 <60 — Aug-98 - <250 <50 <50 <50 <50 Nov-98 - <500 <100 <100 <100 <100 Feb-99 - <5 000 <100 <100 400 <100 Ma -99 - <50 <500 <50 <50 <50 Aug 99 - <500 <50 <50 <50 <50 Aug 00 <10,000 <5 000 <1 000 <100 <100 <100 <100 <100 <100 Nov 00 <20 000 <10 000 <2 000 <200 <200 <200 <200 <200 <200 Mar 01 <50 000 <25 000 <2 000 <200 <200 <200 <200 <200 <200 May-01 -- <2 000 <200 <200 <100 <200 <100 Q00 Aug-01 Nov-02 Not Sampled Jan 03 Well Destroyed � i