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' TABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles-Rock ' Stockton,California Page 9 of 12 (in pjrGs per billion) Well Date et A661' Ethanol- TBA MTBE DJPE ETRE :TAME 1,2 DCA EDB:: M W!1 Nov-00 <500 <250 <50 <5.0 <5.0 <5.0 <5.0 10 <5.0 Cont'd Mar-01 <500 450 <20 <2.0 4.0 <2.0 <2.0 4.2 <2 0 May-01 <20 <2.0 <2.0 <2.0 Aug-01 Not Sampled ' Dec-01 <20 3.1 <2.0 <2.0 <2.0 4.1 <2.0 Feb-02 Not Sampled 0 May-02 <20 7.] <2. <2.0 <2.0 2.6 <2.0 Aug-02 Not Sampled ' Nov-02 -- <20 23 <2,0 <2.0 <2.0 5.8 <2.0 Feb-03 Not Sampled May-03 <20 26 2.9 <2.0 Aug-03 Not Sampled ' Nov-03 <20 E 78 2.3 <2.0 4.0 1 7.7 772 0 Feb-04 Not Sampled May-04 <20 120 <2.0 1 <2.0 <2.0 11 <2.0 Au -04 Not Sampled ' Nov-04 <40 520 <4.0 <4.0 <4.0 Feb-05 Not Sampled May-05 <5.0 120 3.9 <0.5 <0.5 11 <0,5 ' _A2&_05 _ <5.0 59 1.6 <0.5 <0.5 5-0 <0.5 MW 12 Nov-97 1 42 <5.0 7.0 <1.0 <1.0 Feb-98 110 <5.0 <5.0 <5.0 <5.0 May-98 49 <5D 1.9 <1.0 <1.0 ' Aug-98 =_ 58 <1.0 3.4 <1.0 <1.0 Nov-98 45 <1.0 3. 1 <1.0 <I.0 Feb-99 18 1.2 2.7 <1.0 4.D May-99 <50 <5.0 <5.0 <5.0 <5.0 ' Aug-99 <50 <5.0 <5.0 <5.0 <5.0 == _ Nov-99 750 <5.0 <5.0 <5.0 <5.0 May-00 - - ' Aug-00 <500 450 <50 <5.0 -750 _<5.O <5.0 35 <5.0 Nov-00 <500 <250 _<5 0 <5.0 <5.0 -7._0 <5.0 21 <5.0 Mar-01 <500 <250 <20 13 72 0 <2.0 _<2 0 8.1 <2.0 May-01 <20 34 <2.0 <2.0 <2.0 9.8 <2.0 ' Aug-01 <20 48 <2.0 <2.0 <2.0 13 F <2.0 Dec-01 Not Sampled Feb-02 <20 200 <2.0 1 <2.0 4.0 I9 72.0 May-02 Not Sampled ' Aug-02 <20 110 1 <2.0 <2.0 <2.0 19 <2.0 Nov-02 Not Sampled Feb-03 May-03 Not Sampled Aug-03 <20 60 1 <2.0 <2.0 <2.0 21 <2.0 Nov-03 Not Sampled Feb-04 <20 Sl _L <2.0 <2.0 <2.0 16 4.0 ' May-04 Not Sampled Aug-04 T <20 110 <2.0 <2.0 <2.0 23 <2.0 Nov-04 Not Sampled Feb-05 <5.0 71 <0.5 <0.5 <05 17 <0.5 ' May-0.5 -- <5.0 97 <0.5 <0.5 <0.5 18 <0,5 Au -OS <20 280 <2.0 <2.0 <2.0 16 <2.0