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I TABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles -Rock . Stockton,California Page 4 of 6 ' (in parts per billion) Well Date Methanol Ethanol TBA MTBE DNE I ETBE FAME 1,2 BCA EDB ' MW6 Nov-97 — - <5 0 <5 0 <1 0 <1 0 <1 0 =_ _ Feb-98 - 1100 <5 0 <50 <5 0 —<50 Nov-99 - - <50 <5 0 <5 0 <5 0 <5 0 -- - ' Feb 00 _ <50 <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 Q50 <50 <5 0 <5 0 <5 0 <5 0 <5 0 <5 0 Mar-01 <500 450 <20 <2 0 <2 0 <2 0 <2 0 Q 0 <2 0 May-01 -- -- <20 <2 0 4 0 4 0 <2 0 Q 0 <2 0 ' Aug-01 — Not Sampled Dec-01 40 Q0 <20 40 40 QO 40 Feb-02 Not Sampled MW7 Nov-97 - -- <5 0 <5 0 <1 0 <1 0 <1 0 - -- Feb-98 98 _ 1100 <5 0 <5 0 <5 0 <5 0 May 150 <5 0 <5 0 <5 0 —<50 Aug-99 -- — <50 <5 0 <5 0 <5 0 <5 0 -- - ' Nov-99 =_ <50 12 <5 0 <5 0 <5 0 -_ Feb-00 <50 20 <5 0 <5 0 <5 0 May-00 <500 <250 <50 33 <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 4 Nov-00 <500 50 <50 12 <5 0 <5 0 <5 0 <5 0 <5 0 ' Mar-01 1500 Q50 QO 39 4 6 4 0 Q 0 4 0 <2 0 May-01 - -- 120 70 <2 0 <2 0 <2 0 <2 0 <2 0 Aug-01 - -- <20 18 <2 0 <20 <2 0 <2 0 <2 0 Dec-01 - — Not Sampled Feb-02 <20 240 4 0 4 0 Q 0 <2 0 4 0 MW8 Nov-97 - — <5 0 <5 0 42 <10 <10 -- Feb-99 <100 -- <100 <5 0 <5 0 <50 <5 0 Nov-99 <50 <5 0 <5 0 <5 0 <50 Feb-00 -- - <50 <5 0 <5 0 <50 <5 0 -- May-00 <500 <250 <50 <5 0 <5 0 <50 <5 0 <5 0 <5 0 t Aug-00 4500 <1250 <250 <25 45 45 45 <25 <25 Nov-00 <1,000 <500 <100 <10 <10 <10 <10 <10 <10 Mar-O 1 <1,000 <500 <40 <4 0 <4 0 <4 0 <4 0 <4 0 <4 0 ' May-01 = QO 40 QO 120 40 120 40 Aug-01 40 <2 0 <2 0 4 0 <2 0 <2 0 Q 0 Dec-01 -- - QO 40 120 Q0 40 120 120 Feb-02 - — 400 <20 40 QO <20 40 <20 MW9 Nov-97 <50 93 14 <10 <1 0 -- -- Feb-98 <100 22 <5 0 <5 0 [<5 0 Nov-99 - - <50 18 <5 0 <5 0 <5 0 - - ' Feb-00 — -- <50 22 <5 0 <50 <5 0 - - i May-00 1500 <250 <50 27 <5 0 <5 0 <5 0 68 <50 Aug-00 <500 <250 <50 15 <5 0 <5 0 <50 <50 <50 Nov-00 <500 <250 <50 13 <50 <5 0 <5 0 62 <50 Mar-61 <500 450 40 98 4 0 <2 0 4 0 3 1 <2 0 May-OI — <20 85 <20 <20 40 40 <20 Aug-01 <20 60 <20 40 1 <20 <20 40 Dec-01 Not Sampled ' Feb-02 — - <20 87 1 <20 <2 0 <2 0 4 0 4 0