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ITABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles-Roek Stockton, Calitornia Page 1 of 11 (in parts per billion) Well Date " Methanol Ethanol TBA 'MTBE DIPE ETRE TAME 1,2 DCA EDB ' VWl Feb-9S -- <100 <5 0 <5 0 <5 0 <5 0 Feb-0D - 674 <50 <50 <50 <50 - May-00 <50,000 <25,000 <5,000 <500 <504 <500 <SDO <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 -- -- <2,00D <200 <200 <200 <200 390 1,200 Aug-01 <2,000 <200 <200 <200 <200 630 S00 Dec-01 Not Sampled ' Feb 02 -- May-02 <10,000 <1,000 <1,OOQ <1,000 <1,000 <1,000 <lOD0 Aug-02 <10,000 <1,000 <1,000 <1,004 <1,004 <1,400 <1000 Nov-02 Not Sampled ' Feb-03 -- -- <2,000 <200 1 <200 <200 <200 <204 930 May-03 Not Sampled Aug-03 - -- <2,000 <200 1 <200 <200 <200 360 720 Nov-03 Not Sampled ' Feb-04 -- <2,000 <200 <2DD <200 <200 510 240 May-04 Not Sampled Aug-04 -- <2,000 <200 <200 <200 <200 1,700 <200 ' Nov-04 - - Not Sampled Feb-05 <2 QUQ <200 <200 X00 <200 1 100 <200 VW2 Aug-00 <10,000 <5,000 <1,000 <102 <100 <100 <100 <100 <lO0 jAug-02- <4,000 <2,000 <400 <44 <40 <4D <40 <40 <40 ' <10 000 <52000 <400 <40 <40 <40 <40 <40 <40 i <200 <2D <2Q <20 <20 <20 <20 1 Not Sampled <404 490 <40 <40 <40 <44 <40 ' -- <400 <40 <40 <40 <40 <40 <40 2 - <400 <40 <40 <40 <40 <40 <40 - Not Sampled ' -_ -- 4 <20 <2 0 <20 <2 0 <2 0 <2 0 <2 0 4- Not Sampled S -- - - - VW3 Nov-97 <100 <20 <20 <20 <20 Feb-98 - <100 <5 0 <5 0 <5 0 <5 D Feb-00 <50 <5 0 <5 0 <5 0 <5 - ' 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 4 <5 0 <5 0 <5 4 <5 4 Nov 00 <500 <250 <50 <5 0 <5 0 <5 0 <5 0 <5 4 <5 0 Mar-01 <2,500 <1,250 <100 <10 <10 <10 <10 <10 <1D ' May-01 -- -- <20 <2 0 <2 0 <2 0 <2 4 <2 0 <2 0 Aug-01 <40 <4 0 <4 0 <4 0 <4 q <4 0 <4 0 Dec-0 Not Sampled ' Feb-02 - <20 <2 0 <2 0 <2 0 <2 4 <2 0 Q 0 May-02- Not Sampled . Aum-02 I