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TABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles- Roek Stockton, California Page 1 of 11 (in parts per billion) 1 ' VW1 Feb-98 == <100 <5.0 <5.0 <5.0 <5.0 -- Feb-00 670 <50 <50 <50 <50 May-00 <50,000 <25,000 <5,000 <500 <500 <500 <500 <500 <500 ' Aug-00 <25,000 <12,500 <2,500 <250 <250 <250 <250 <250 490** Nov-00 <40,000 <20,000 <4,000 <400 <400 <400 <400 <400 1,200 Mar-01 <100,000 <50,000 <4,000 <400 <400 <400 <400 <400 590 ' May-01 -- -- <2,000 <200 <200 <200 <200 390 1,200 Aug-01 -- -- <2,000 <200 <200 <200 <200 630 800 Dec-01 Not Sampled tFeb-02 May-02 -- <10,000 <1,000 <1,000 <1,000 <1,000 <1,000 <1,000 Aug-02 ' Nov-02 Not Sampled Feb-03 -- -- <2,000 <200 400 <200 <200 <200 930 ' May-03 - -- Not Sampled Aug-03 <2,000 <200 <200 <200 <200 360 720 Nov-03 Not Sampled Feb-04 -- -- <2000 <200 <200 <200 <200 510 240 May-04 Not Sampled VW2 Aug-00 <10,000 <5,000 <1,000 <100 <100 <100 <100 <100 <100 Nov-00 <4,000 <2,000 <400 <40 <40 <40 <40 <40 <40 Mar-01 <10,000 <5,000 <400 <40 <40 <40 <40 <40 <40 May-01 -- -- <200 <20 <20 <20 <20 <20 <20 ' Aug-01 - -- Not Sampled Dec-01 <400 490 <40 <40 <40 <40 <40 Feb-02 -- <400 <40 <40 <40 <40 <40 <40 ' May-02 -- -- <400 <40 <40 <40 1 <40 1 <40 j <40 Aug-02- Not Sampled Feb-04 ' May-04 =_ <20 <2A <2.0 1 <2.0 1 <2A V W3 Nov-97 <100 <20 <20 <20 <20 Feb-98 -- -- <100 <5.0 <5.0 <5.0 <5.0 -- -- ' 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 <50 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 Mar-01 <2,500 <1,250 <100 <10 <10 <10 <10 <10 <10 May-0I -- -- <20 <2.0 1 <2.0 <2.0 4.0 1 <2.0 <2.0 ' Aug-01 -- <40 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 Dec-01 Not Sampled Feb-02 -- <20 <2.0 1 <2.0 <2.0 <2.0 <2.0 <2.0 ' May-02- Not Sampled Aug-02