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i i I tTABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles Property Stockton, California Page 5 of 5 ' (in parts per billion) I Wen Date Methanol Ethanol TBA MTBE D1PE ETBE TAME 1,2 DCA EDB ' MW12 Nov-97 — 42 <5 0 70 <1 0 <l 0 -- -- Feb-98 — — 110 <5 0 <5 0 <5 0 <5 0 -- -- ' May-98 - = 49 <5 0 19 Aug-98 58 <1 0 34 <1 0 <l 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 — — — — -- — — N May-00 Aug-00 <500 450 <50 <5 0 <5 0 <5 0 <5 0 35 <5 0 Nov-W <500 450 <50 <5 0 <5 0 <5 0 <5 0 21 <5 0 Mar-01 <500 450 <20 13 <2 0 <2 0 <2 0 8 1 4 0 Ma -01 <20 34 <2 0 <2 0 <2 0 98 <2 0 MW 13 Nov-97 -- -- <50 <5 0 <5 0 <5 0 <5 0 -- -- Feb-98 — _ <500 <30 <30 <10 «0 — May-98 <600 <60 <60 <60 <60 Aug-98 -- — <250 <50 <50 <50 <50 -- -- ' Nov-98 — <500 <100 <100 <100 <100 Feb-99 15,000 <100 <100 <100 <100 May-99 — — <50 <500 <50 <50 <50 Aug-99 -- -- <500 <50 <50 <50 <50 -- -- Aug-00 <10,000 <5,000 <1,000 <100 <100 <100 <100 <100 <100 Nov-00 <20,000 <10,000 <2,000 <200 <200 <200 <2W <200 <200 Mar-01 <50,000 45,000 <2,000 400 400 1 400 <200 <2W <200 ' May-01 — I -- <2,000 400 <200 <200 <200 1 <200 1 <200 MW14 Mar-01 <50,000 <25,000 4,000 24,000 400 400 <200 <200 <200 May-01 -- — <5,000 15,000 <500 <500 <500 <500 1 <Soo ' NOTES Analyzed using modified EPA method 8260 ' Bold values mdtcate value at or above method detection hm,t DIPE Di-isopropyl ether ETBE Ethyl tertbutyl ether MTBE = Methyl tert-butyl ether ' TAME _ tert-amyl methyl ether TBA tert-butanol(tertiary butyl alcohol) 1,2 DCA = 12 Dtchloroethanc EDB _ Ethylenedibromide < Less than the indicated detection limit # = Resampled 12/16/97 *• — Amended result (Argon Laboratory corresp, 1217100) 1 1