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TABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER I Knowles-Roek Stockton,Calitornia . Page 7 of I I (in parts per billion) Well Date Methanol Ethanol TBA MTBE D1PE I ETBE TAME J,2 DCA EDB MW7 Aug-Q1 -- <20 1S 1 --To— 1 <2 0 <2 0 <2 Q <2 0 Cont'd Dec-01 Not Sampled Feb-02 -- <20 240 1 <2 0 <20 <20 <2 0 <2 0 Mav-02 - Not Sampled Aug-02 <20 280 <2 0 <20 <2 0 <2 0 <2 0 Nov-02 Not Sampled Feb-03 - <20 —1107 <20 <20 <2D <2 0 <2 0 May-03 Not Sampled Aug-03 - - <24 I I <2 0 <2 0 <2 Q <2 0 <2 D Nov-03 Not Sampled ' Feb-04 - - <20 150 T <2 0 <2 0 <2 0 <2 0 <20 May-041 Not Sampled Aug-04 - <20 140 <2 0 <2 Q <2 0 F <2 Q L <20 ' Nov-04 - Not Sampled - Feb-05 <5 0 32 <0 5 <0 5 <0 5 <0 5 <0 5 MW8 Nov-97 -- <5 0 <5 0 42 <1 0 <1 0 -- Feb-98 -- - <100 <5 0 <5 0 <5 0 <5 0 -- -- Nov-99 - <50 <5 0 <5 0 <5 0 <5 0 j Feb-00 <50 <5 0 <5 0 <5 0 <5 Q May-00 <500 <250 <50 <5 0 <5 4 <5 0 <5 Q <50 <5 0 ' Aug-DO <2500 <1250 <250 <25 <25 <25 <25 <25 <25 Nov-00 <1,000 <500 <100 <10 <10 <10 <10 <10 <to Mar-01 <1,000 <500 <40 <4 0 74 0 <4 0 <4 0 <4 0 <4 4 May-01 - - <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 D ' Aug-01 =_ <20 <2 0 <2 0 <2 0 <2 D <2 0 <2 D Dec-01 <20 <2 D <2 D <2 0 <2 0 <2 Q <2 0 Feb-02 <200 1 <20 <20 <20 <2D <20 <20 ' May-02 =_ <20 <2 0 <2 4 <2 0 <2 D <2 0 <2 0 Aug-02 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 Nov-02 -- <20 <2 0 <2 0 <2 4 <2 0 <2 0 <2 0 Feb-03 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 ' Mav-03 -- — <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 Aug-03 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 Nov-03 - <20 <2 0 <2 0 <2 0 <2 4 <2 0 <2 0 Feb-04 -- - <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 ' Mav-04 -- -- <20 < 4 <2 0 <2 0 —<20 <2 0 <2 0 Aug-04 <20 55 <2 0 <2 0 1 <2 4 23 <2 0 Nov-04 - <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 I Feb-05 == -- <5 0 <0 5 <0 5 <0 5 <0 5 1 2 <0 5 NlW9Nov-97 <5 0 93 1 4 <1 0 <1 0 Feb 98 -- - <100 22 <5 0 <5 0 <5 0 -0 <5 0 -- ' <50 18 <5 0 <5 -- Nov-99 -- -- -- Feb-OD <50 22 <5 0 <5 0 <5 0 May-00 <500 <250 <50 27 <5 0 <5 0 <5 0 68 <5 0 Aug-04 <500 <250 <50 15 <5 0 <5 0 <5 0 <5 0 <5 0 ' Nov-00 <500 <250 <50 13 <5 0 <5 0 <5 0 62 <5 0 Mar-01 <500 <250 <20 98 <2 4 <2 0 <2 0 3 1 <2 4 • May-01 -- <20 85 <2 0 <2 4 <2 0 <2 0 <2 0 A 0 <20 60 <2 4 <2 0 <2 0 <2 0 <2 0 ' Dec-01 Not Sampled I