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TABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles- Rock Stockton,California Page 9of 11 (un parts perrbillion) Well Date Methanol Ethanol TBA MTBE DIPS ETBE TAME '1,2 DCA EDB ' MW11 Nov-00 <500 <250 <50 <50 <5 0 <5 0 <5 0 10 <5 0 Cont'd Mar-01 <500 <250 <20 <2 0 <2 0 <2 0 <2 0 42 <2 0 May-01 - -_ <20 <2 0 <2 0 <2 D <2 0 8 6 <2 4 ' Aug-01 - - Not Sampled <2 0 Dec-01 <20 3 1 <2 0 <2 0 <2 0 4 1 Feb-02 Not Sampled ' May-02 -- -- <20 7 1 <2 0 <2 0 <2 0 2 6 <2 0 Aug-02 Not Sampled Nov-42 -- -- <20 23 <2 0 <2 0 <2 0 5 8 <2 0 Feb-03 Not Sampled ' May-03 -- - 40 26 29 <2 0 <2 0 10 <2 0 Aug-03 Not Sampled Nov-03 _ <20 78 23 <2 0 <2 0 7 7 <2 0 ' Feb-04 _ Not Sampled I20 <2 0 <2.0 <2 0 I I <2 0 May-04 <20 Aug-04 Not Sampled Nov-04 -- -- <40 520 <4 0 <4 0 <4 0 IO <4 6 ' Feb-05 Not Sampled `- Y MW 12 Nov-97 42 <5 0 70 <10 <1 0 Feb-98 -- -- 110 <5 0 <5 0 <5 0 <5 0 May-98 -- ' 49 <5 0 1 9 <1 0 <1 0 - -- -- -- - Aug-98 58 <1 0 34 <1 0 <1 0 Nov-98 -- 45 <1 0 33 <1 0 c1 0 Feb-99 - - 18 1 2 27 <1 0 <1 0 -- - May-99 -- <50 <5 0 <5 0 <5 0 c5 0 -- Aug-99 <50 <5 0 <5 0 <5 0 <5 0 Nov-99 -- <50 <5 0 <5 0 May-OD 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 D 21 <5 0 ' Mar-01 <500 <250 <20 13 <?0 <2 0 <2 0 8 1 <2 D May-01 <20 34 <2D <20 QO 98 <20 <2 0 I3 <2 0 Aug-01 _ <20 48 <2 U. <Z 0 ' Dec-01 _- -_ Not Sampled Feb-02 <20 200 <2 0 <2 0 <2 0 19 1 <2 0 May-02 Not Sampled Aug-02 - <20 110 1 <20 <20 <20 19 <2 0 ' Nov-02 - Not Sampled Feb-03 <20 78 1 <2 0 <2 0 <2 0 18 <2 0 May-03 Not Sampled Aug-03 - <20 60 1 <20 <20 <20 21 <2 0 Nov-03 Not Sampled Feb-04 c20 51 <2 0 <20 <20 16 <2 0 May-04 Not Sampled ' Aug-04 -- - <20 110 1 <2 0 <2 0 <2 0 23 <2 0 Nov-04 Not Sampled Feb-OS -- -- <50 71 <05 <OS <OS 17 <05 1