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I TABLE 3 OXYGENATED COMPOUNDS IN GROUNDWATER Knowles - Roek Stockton,Callfornla • Page 10 of 10 (in parts per billion) Well Date Methanol EthanoI7 TBA MTBED1PE ETBE TAME 1,2 DCA EDB MW14 Feb-02 -- <1,000 70,000 <100 <100 <100 <100 <100 Cont'd May-02 -- -- <10,000 81,000 <1,000 <1,000 <1,000 <1,000 <1,000 Aug-02 -- <10,000 140,000 <1,000 <1,000 <1,000 <1,000 <1,000 Nov-02 -- -- <10,000 210,000 <1,000 <1,000 <1,000 <1,000 <1,000 Feb-03 -- -- <2000 110,000 <200 <200 <200 <200 <200 May-03 -- -- <10,000 100,000 <1,000 <1,000 <1,000 <1,000 <1,000 Aug-03 -- <2,000 63 000 <200 <200 <200 <200 <200 MW15A Jan-03 -- -- <20 34 <2 0 <2 0 <2 0 <2 0 <2 0 Feb-03 -- -- <20 59 <2 0 <2 0 <2 0 45 <2 0 May-03 -- -- <20 33 <2 0 <2 0 <2 0 47 <2 0 Aug-03 -- -- <20 86 <2 0 <2 0 <2 0 26 <2 0 MW 15B Jan-03 -- -- <20 76 <2 0 <2 0 <2 0 55 <2 0 Feb-03 -- -- <20 86 <2 0 <2 0 <2 0 $4 <2 0 May-03 -- -- <20 190 <2 0 <2 0 <2 0 9 0 <2 0 Aug-03 -- -- <20 320 <2 0 <2 0 <2 0 68 <2 0 MW15C Jan-03 -- -- <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 Feb-03 -- -- <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 May-03 <20<20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 Aug-03 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 MW16A Jan-03 -- -- <1000 2,500 <100 <100 <100 <100 <100 Feb-03 -- -- <400 2,900 <40 <40 <40 <40 <40 May-03 -- -- <400 1,300 <40 <40 <40 <40 <40 Aug-03 -- -- <400 1,400 <40 <40 <40 <40 <40 MW16B Jan-03 -- -- <200 170 <20 <20 <20 <20 <20 Feb-03 -- -- <400 260 <40 <40 <40 <40 <40 May-03 -- <400 87 <40 <40 <40 <40 <40 Aug-03 -- -- <400 120 <40 <40 <40 <40 <40 NOTES Analyzed using modified EPA method 8260 Bold values mdicate value at or above method detection limit DIPS = Dr-isopropyl ether ETBE = Ethyl tert-butyl ether MTBE = Methyl tert-butyl ether TAME = tert-amyl methyl ether TBA = tert-butanol(tertiary butyl alcohol) 1,2 DCA = 1,2 Dichloroethane EDB = Ethylenedtbromide i < = Less than the indicated detection limit * Resampled 12/16/97 ** = Amended result (Argon Laboratory corresp, 12/7/00)