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I ' TABLE 5 OXYGENATED COMPOUNDS M GROUNDWATER Knowles - Roek • Stockton, California Page 3 of 9 ' (in parts per billion) Well Bate Methanol Ethanol TBA MTBE DD'E I ET$E I TAME 11,2 DCA EDB t MW 1 Nov-97 -- -- 14 <5 0 13 <10 <10 -- -- Feb-98 -- -- <100 <5 0 <5 0 <5 0 <5 0 May-98 -- -- 13 <5 0 <10 <10 <10 -- ' Aug-98 == 36 <10 <10 <10 <10 =_ _- Nov-98 64 <10 <10 <10 <10 Feb-99 -- -- 310 <10 <10 <10 <10 -- -- May-99 " <50 <5 0 <5 0 <5 0 <5 0 Aug-99 <50 <5 0 <5 0 <5 0 <5 0 Nov-99 -- -- <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 <250 <50 <5 0 <5 0 <5 0 <5 0 <5 0 <5 0 Mar-O 1 <500 <250 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 May-01 -- -- <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 ' Aug-01 -- -- <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 Dec-01 Not Sampled Feb-02 -- -- <20 <2 0 1 <20 1 <2 0 <2 0 <2 0 <2 0 ' May-02 -- -- Not Sampled Aug-02 <20 <2 0 1 <20 1 <2 0 <2 0 <2 0 <2 0 Nov-02 Not Sampled ' Feb-03 =_ <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 MW2 Nov-97 160 <20 <20 <20 <20 Feb-98 -- -- <100 <5 0 <5 0 <5 0 <5 0 -- -- Nov-99 -- <50 <5 0 <5 0 <5 0 <5 0 == =_ Feb-00 <50 <5 0 <5 0 <5 0 <5 Q May-00 <2,500 <1,250 <250 <25 <25 <25 <25 260 <25 ' 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 15 <5 0 Mar-01 <1,000 <500 <40 <4 0 <4 0 <4 0 <4 0 56 14 May-01 __ <20 <2 0 <2 0 <2 0 <2 0 41 12 Aug-01 <20 <2 0 <2 0 <2 O.._j <2 0 65 <2 0 Dec-01 Not Sampled . ' Feb-02 -- -- <20 <2 0 1 <2 0 1 <20 <2 0 35 <2 0 May-02 Not Sampled Aug-02 -- <20 <2 0 1 <2 0 1 <20 <2 0 29:::=<2 0 ' Nov-02 -- Not Sampled Feb-03 66 <2 0 <2 0 1 <2 0 <2 0 18 <2 0 1