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TA13LE 3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles- Rock . Stockton,California Page 4 of 1 1 (in parts per billion) Well Date Methanol Ethanol TBA MTBE RIPE ETM TAME 1,2 DCA EDB L MW2 Nov-97 -- 160 40 <20 40 <20 -- - Feb-98 -- - <100 <5 0 <50 <50 <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 <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 0 <2 0 65 <2 0 Dec-01 Not Sampled F -- <20 <2 0 <2 D <2 0 <2 0 35 <20 Not Sampled - <20 <2 0 <2_0 <2 0 <2 0 29 <2 0 Not Sampled -- 66 <20 <20 <2 0 <2 0 18 <2 0 -- Not Sampled 40 <2 0 4 0 <2 0 <2 0 26 <2 0 Not Sampled Feb-04 - <20 <2 0 <2 0 <2 0 <2 0 17 <2 0 May-D4 -- - Nat Sampled Aug-04 <200 <20 1 <20 <20 <20 38 <20 Nov-04 Not Sampled Feb-05 - <200 26 <20 40 <20 <20 <20 MW3 Nov-97 =` - <35 <5 0 <1 0 <1 0 <1 0 Feb-98 <100 <5 0 <5 0 <5 0 <5 0 May-98 -- 21 19 11 <10 <10 -- -- Aug-98 _= 26 27 <10 <10 <10 -- -- Nov-98 <50 220 <10 I <10 <10 Feb-99 - -- <330 1,600 F <65 F <65 <65 - - May-99 -- - <250 1,400 <25 0 <25 0 <25 0 -- Aug-99 _ <200 1,400 <20 <20 <20 - -- Nov-99 <250 1,500 <25 <25 <25 Feb-00 -- -- <250 4,000 ft<25 <255 -- - May-00 <5,000 <2,500 <500 3,800 0 <50 <50 Aug-00 <5,000 <2,500 <500 1,200 0 <50 <50 Nov-00 <2,500 <1,250 <250 2,600 5 <25 <25 Mar-01 <25,000 <12,500 <1,000 1,200 0 <100 <100 May-01 -- <200 3,8000 <20 <20 Aug-01 450 2,000 <25 <25 <25 <25 <25 Dec-01 -- <500 17,000 <50 <50 <50 <50 <50 Feb-02 Y- <1,000 15,000 <100 <100 <100 <100 <100 May-02 <2,000 34,000 <200 <200 <200 <200 <200 Aug-02 -- -- <1,000 24,000 <100 <100 <100 <100 <100 <<24'000000 5,300 <400 <400 <404 <400 <400 I •