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TABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles-Rock Stockton,California . Page 2 of 11 ' (m parts per billion) Well Date Methanol Ethanol TBA MTBE D1PE ETBE TAME 1,2 DCA EDB VW3 Nov 102 -- - <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 Cont'd Feb-03 -- - <100 <10 <10 <10 <10 <10 <10 ' May-03 _ Not Sampled Aug-03 <200 <20 <20 <20 <20 <20 <20 Nov-03 Not Sampled Feb-04 -- <204 <20 <20 <20 <20 <20 <20 ' May-04 - Not Sampled Aug-04 <40 55 <4 0 <4 0 <4 0 <4 0 <4 0 Nov-04 Not Sampled ' Feb-05 _= <204 51 <20 <20 <20 <20 <20 VW4 Nov-97 <250 1 <50 <50 <50 <50 Feb-98 - -- <100 <5 0 <5 0 <5 0 <5 0 Feb-00 -- -- <50 <5 0 20 <5 0 <5 0 - ' May-00 <500 <250 <50 <5 0 <5 0 <5 0 <5 0 34 <5 0 Aug-OQ <500 <250 <50 <5 4 <5 0 <5 0 <5 0 <5 0 <5 0 Nov-00 I <1,000 <500 <100 <10 <10 <10 <10 130 <10 Mar-01 <2 500 <l 250 <100 <10 <10 <10 <10 190 <10 ' May-01 -- -- <40 <4 0 <4 0 <4 0 <4 1 270 <4 0 Aug-01 Not Sampled Dec-01 -- <20 <2 D <2 0 <2 0 <2 D 97 <2 0 ' Feb-02 -- Not Sampled <2 D 110 <2 0 May-02 <20 0 <2 0z''! 0 Aug-02 Not Sampled Nov-02 -- <20 <2 0 1 <2 0 <2 0 <2 0 48 <2 0 ' Feb-03 - Not Sampled May-03 <20 77�<211 <2 0 <2 0 <2 0 75 <2 0 Aug-03 Not Sampled ' Nov-03 - <207—T <2 4 1 <2 0 <20 <2 0 30 <2 0 Feb-04 Not Sampled May-04 __ <20 <2 0 j <2 0 <2 0 <2 0 60 <2 0 Aug-04 Not' Sampled Nov-04 <20 <2 0 <2 0 <2 0 <2 0 49 <2 0 Feb-05 Not Sampled VW5 I ENov-00 - <50 <5 4 <5 4 <5 0 <5 0 -- -- ' <500 <250 <50 <5 0 <5 0 <S b <S 0 <5 0 <5 0 <500 <250 <50 <5 0 <5 0 <5 0 <5 0 <5 0 <5 0 <500 <250 <SO <S 0 <5 0 <5 0<500 <250 <20 <2 0 <2 0 <2 0 CL 0 <2 0 <2 4 ' May-01 <20 <2 D <2 0 <2 0 <2 4 <2 0 <2 0 Aug-01 Not Sampled Dec-01 __ -<2() T <2 0 <2 0 <2 0 <2 O <2 0 <2 0 ' Feb-02 Not Sampled May-02 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 O Aug-02- Not Sampled Feb-05 ' VW6 Nov-97 -- -- <670 <135 <135 Feb-9$ <500 <30 <3 <30 <30 Feb-00 <250 <54 <50 <50 <50 -- May-00 <10OOD <SODO <1000 <]00 <1Q4 <]OD <100 <lO0 <l00 I