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TABLE3 ' OXYGENATED COMPOUNDS tN GROUNDWATER Knowles-Rock Stockton,California Page 2 of 12 (+n park per billion) Well Date Methanol Ethanal TBA MTBE I DIPS I ETBE TAME 1,Z DCA I EDB V W 3 Nov 02 <20 <20 <20 <2 0 <2 0 <2 0 <2 0 Cont'd Feb 03 <100 <10 <10 <10 <10 <10 <to May 03 Not Sampled Aug 03 -- <249 <20 1 QO QD <20 QO QO Nov-03 Not Sampled Feb-04 I <200 t <20 <20 <20 <20 <20 <20 May 04 Not Sampled Aug-04 - <40 55 <40 <4 0 <4 0 <4 0 <4 0 Nov-04 Not Sampled Feb-05 <200 51 <20 <20 <20 <20 QO May 05- Not Sampled Jun-06 VW4 Nov 97 -- <250 <50 <50 <50 <50 - -- Feb 98 -- <100 <5 0 <5 0 <5 0 <5 0 Feb 09 -- <50 <50 20 <5 0 <5 0 - -- May-00 <500 <250 <50 <5 0 <5 0 <5 0 <5 0 34 <5 0 Aug-00 <500 <250 <50 <5 0 <5 0 <5 0 <50 <5 0 <5 0 Nov-00 <1000 <500 <100 <10 <10 <10 <10 130 <10 Mar 01 Q 500 <l 250 <100 <10 <10 40 710 190 <10 May 01 - <40 <40 <40 <4 0 <40 270 <4 0 Aug-01 Not Sampled Dec-01 - <20 <20 <20 <2 0 <2 0 97 <2 0 Feb-02 Not Sampled May 02 <20 <20 <20 <2 0 <2 0 110 <2 0 Aug 02 Not Sampled Nov 02 <20 <20 <20 <2 0 <2 0 48 <2 0 Feb 03 Not Sampled May 03 Q0 <20 <20 <2 0 <2 0 75 <2 0 Aug 03 Not Sampled Nov 03 -- 40 <20 <20 <2 0 <2 0 30 <2 0 Feb-04 Not Sampled May-04 <20 <2 0 Q 0 <20 <20_1 60 1 <2 0 Aug-04 Not Sampled Nov 04 -- <20 1 <20 <20 <2 0 1 <2 0 1 49 1 <2 0 Feb-05- Not Sampled Jun-06 VW5 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 <500 <250 <50 <5 0 <5 0 <5 0 <5 0 <5 0 <5 0 Nov-00 <500 <250 <30 <5 0 <5 0 <5 0 <50 <5 0 <5 0 Mar 01 <500 <250 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 May 01 - -- <20 <20 <20 <20 <20 <20 <20 Aug 01 Not Sampled Dec 01 - - Q0 <20 <2 01 <20 <20 <20 <20 Feb-02 Not Sampled May-02 <24 1 <20 <20 <2 0 <2 0 <2 0 <2 0 Aug-02- Not Sampled Jun 06 VW6 Nov-97 -- <670 <135 <135 <135 <135 - Feb 98 <500 <30 <30 <30 <30 Feb-00 -- <250 <50 <50 <50 <50 - -- Ma -00 <10,000 <5,000 <1.000 <100 <100 <100 <100 400 <100