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TABLE 3 ' OXYGENATED COMPOUNDS IN GROUNDWATER Knowles-Roek Stockton, California ' Page 11 of 11 • (in parts per billion) ' <20 76 <2.0 <2.0 <2.0 5.5 <2.0 MW15B Jan-03 Feb-03 <20 86 <2.0 <2.0 <2.0 8.4 <2.0 <20 190 <2'0 <2.0 <2.0 9.0 <2.0 May-03 `- -- Aug-03 -- <20 320 <2.0 <2.0 <2.0 6.8 <2.0 tNov-03 -- <20 440 <2.0 <2.0 <2.0 6.4 <2.0 <20 400 <2.0 <2.0 <2.0 A <2.0 Feb-04 ' May-04 -- =' <20 300 <2.0 <20 <2.0 <2.0 <2.0 <2.0 MW 15C Jan-03 Feb-03 <20 <2.0 <2 0 <2.0 <2.0 <2.0 <2.0 May-03' -- -- <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 Au -03 _ <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 Nov-03 -- -" Feb-04 -- <20 <2.0 <2.0 <2.0 <2.0 <2.0 <2.0 __ __ <2.0 <2.0 <2.0 <2.0 2 <2.0 May-04 <20 .4 y <100 <100 <100 <100 <100 M W 16A Jan-03 -- <1000 2,500 <400 2,900 <40 <40 <40 <40 <40 ' Feb-03 May-03 Aug-03 <400 1,400 <40 <40 <40 <40 <40 <40 =� <40 <40 <40 <40 ' Nov-03 -- - <400 3,300 <40 Feb-04 <400 1,500 <40 <40 <40 <40 < <400 760 <40 <40 <40. <40 40 May-04 '" 00' <20 <20 <20 MW16B Jan-03 -- -- <4170 <20 <20 <400 260 <40 <40 <40 <40 <40 ; Feb-03 __ <40 <40 <40 <40 <40 May-03 -- <400 87' Aug-03 <400 120 <40 <40-_ <40 <40 <40 <40 Nov-03 <400 140 <40 <400 <40 <40 <40 <40 <40 <40 Feb-04 -- -- <20 <20 <20 <20 <20 ' NOTES Analyzed using modified EPA method 8260. Bold values indicate value at or above method detection limit. DIPE - Di-isopropyl ether ' ETBE = Ethyl tert-butyl ether MTBE - Methyl tert-butyl ether TAME - tert-amyl methyl ether tTBA = Cert-butanol(tertiary butyl alcohol) 1,2 DCA = 1,2 Dichloroetime EBB = Ethylenedibromide ' < = Less than the indicated detection limit s _ Resampled 12/16/97 r Amended result (Argon Laboratory corresp, 1217/00)