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1 TABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER ' Knowles Property Stockton, Callfornla Page 4 of 5 (in parts per billion) Welt D'te Methanol Ethan d TBA MTBE DiPE ETBE TAME 1,2 DCA EDB MWl l Nov-97 - - 12 <5 0 94 <10 <1 0 - - Feb-98 <100 <5 0 16 <5 0 <5 0 Ma -98 -- – 38 <5 0 11 <1 0 <1 0 – -- Aug-98 - - 44 <10 28 <10 <10 - - Nov-98 35 <10 26 <1 0 <1 0 Feb-99 – – 18 <10 22 <10 <10 – – May-99 – – <50 <5 0 16 <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 – – _ _ _ – – May-00 <500 450 <50 <5 0 95 <5 0 <5 0 27 <5 0 Aug-00 <500 450 <50 <5 0 <5 0 <5 0 <5 0 37 <5 0 Nov-04 <500 450 <50 <5 0 <5 0 <5 0 �—�1200 10 <5 0 Mar-01 <500 4S0 40 <2 0 4 0 4 0 42 4 0 MW12 Nov-97 - - 42 <5 0 70 <10 <1 0 - - Feb-98 110 <5 0 <5 0 <5 0 <5 D Ma -98 – – 49 <5 0 19 <10 <10 – -- Aug-98 – - 58 <1 0 34 <10 <1 0 - Nov-98 45 <1 0 33 <1 0 <1 0 Feb-99 18 12 27 <1 0 <1 0 . 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 – – – – – -- _ _may-00 -- _ _ – – – – Aug-00 <500 <250 <50 <5 0 <5 0 1 <5 0 <5 0 1 35 <5 0 NOV-00 1 <500 450 1 <50 1 <5 0 <5 0 <5 0 <5 0 21 <5 0 Mar-0I I <500 450 1 40 13 4 0 4 0 4 0 81 4 0 MW l3 Nov-97 - - <50 <5 0 <5 0 <5 0 <5 0 Feb-98 <500 40 40 40 <30 – – may-98 – – <600 <60 <60 <60 <60 – – Au -98 — — 450 <50 <50 <50 <50 — — Nov-98 - - <500 <100 <100 <100 <100 - - Feb-99 <5,000 <100 <100 <100 <100 may-99 -- – <50 <500 <50 <50 <50 – – ' Aug-99 – – <500 <50 <50 <50 <50 – – Au -0o <10,000 <5,000 <1,000 <too <100 <100 <100 <100 <100 Nov-00 40,000 <10,000 1 4,000 400 400 400 400 400 400 Mar-01 <50,000 45,000 <2,000 400 400 400 400 400 <200 MW14 Mar-01 1 <50000 45,000 4,000 24,000 400 400 400 400 400