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TABLE OXYGENATED COMPOUNDS IN GROUNDWATER Knowles-Roek Stockton,California Page 4 of I I (in parts per billion) E MW2 Nov-97 160 <20 <20 <20 <20 Feb-98 <100 <5.0 <5.0 <5.0 <5.0 Nov-99 <50 <5.0 <5.0 <5.0 <5.0 Feb-00 -- -- <50 1 <5.0 <5.0 <5,0 <5,0 May-00 <2,500 <1,250 <250 <25 <25 <25 <25 260 <25 Aug-00 <500 <250 <50 <5.0 <5.0 <5,0 <5.0 <5.0 1 <5,0 Nov-00 <500 <250 <50 <5,0 <5.0 <5.0 <5.0 15 <5.0 Mar-01 <1,--000 <500 <40 <4,0 <4.0 <4.0 <4.0 56 14 May-01 -- <20 <2.0 <2.0 4.0 <2.0 41 12 Aug-01 1-72-0 [-<20 1 <2.0 <2-0 <2.0 6.5 <2,0 Dec-01 Not Sampled Feb-02 <20 <2.0 [ <2.0 <2.0 <2.0 35_ May-02 Not Sampled -- Aug-02 <20 <2.0 <2.0 <2.0 F-<-2-0-T- 29 <2.0 Nov-02 Not Sampled Feb-03 66 <2.0 <2.0 <2.0 <2.0 18 <2.0 May-03 Not Sampled Aug-03 <20 <2.0 <2.0 <2.0 <2.0 26 <2.0 j Nov-03Not Sampled Feb-04 <20 <2.0 <2.0 <2.0 <2.0 17 <2,0 May-04 Not Sampled Au!-04 <200 <20 <20 <20 <20 38 <20 ' . ':0 No 4± Not Sampled Feb-05 <200 26 <20 <20 <20 <20 <20 MW3 Nov-97 <35 <5.0 <1.0 <1.0 <1.0 -- -- Feb-98 <100 <5.0 <5.0 <5.0 <5.0 =� -- May-98 21 19 1.1 <1,0 <1.0 Aug-99 26 27 <1.0 <1.0 <t.0 Nov-98 <50 220 <10 <10 <10 Feb-99 <330 1,600 <65 <65 <65 1 May-99 <250 1,400 <25,0 <25.0 <25.0 Aug-99 <200 1,400 <20 <20 <20 Nov-99 <250 1,500 <25 <25 <25 Feb-00 <250 4,000 <25 <25 <25 May-00 I <5,000 <2,500 <500 1 3,800 <50 <50 <50 <50 <50 Aug-00 <5,000 <2,300 <500 1,200 <50 <50 <50 <50 <50 Nov-00 <2,500 <1,250 <250 2,600 <25 <25 <25 <25 <25 Mar-01 <25,000 <12,500 <1,000 -1,200 <100 <100 <100 <100 <100 May-01 -- -- <200 3,800 1 <20 <20 <20 <20 1 <20 Aug-01 <250 2,000 <25 <25 <25 <25 <25 Dec-01 <500 1g7,000 <50 <50 <50 <50 <50 Feb-02 <1,000 15,000 <100 <100 <100 <100 <100 ()00 May-02 <2,000 34,000 <200 <200 <200 <200 <200 Aug-102 <1,000 24,000 <100 <100 <100 I <100 <100 Nov-02 <4,000 5,300 <400 <400 <400 1 <400 _j <400