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Mr Terry Tardus November 2, 2004 Page 4 Other Oxygenates. Dnso roPY1 ether ( IPE)� ethyl-tertiary-butyl ether ( tBE) , tert-amyl methyl ether (TAME) and Cert-butanol were not detected in the samples from MW-2, MW-3 and the Supply Well Concentrations of DIPE were detected in samples from MW-1 and MW-4 at 31 µg/L and 14 µg/L,respectively Concentrations of ELBE above the reporting limit were not detected in any of the samples TAME was detected in the sample from MW-1 at 38 µg/L Detectable concentrations of tert-butanol were reported in the samples from MW-I at 74 ug/L (a significant decrease from 2,300 µg/L reported in the second quarter) As in previous reporting, Kiff Analytical applied a "]" flag to the MW-1 text-butanol detection due to the low conversion of MtBE to Cert-butanol during the analysis Kiff Analytical considers this conversion effect to be mathematically significant in samples that contain MtBE/tert-butanol in ratios of over 20 1 The following documents are enclosed with this letter Table 1 Historical Groundwater Elevation Data Table 2 Groundwater Flow Direction and Gradient Table 3 Historical Groundwater Analytical Data Figure 1 Site Map Figure 2 Groundwater Elevation Map, September 14, 2004 Figure 3 Groundwater Constituent and Benzene Isoconcentration Map, September 14, 2004 Figure 4 MtBE Isoconcentration Map, September 14,2004 Attachment A Field Data Sheets Attachment B Laboratory Analytical Reports ' 7hir rrpod war prrpared in an ondamr uaM Me rlandarrh of dx nunnnmenta!ronrullrng indmoy ai/he irmr a jwxprrparrd It rhould not be rrhed upon 1>)padre i odk r dkrn/true for whom a&v r pnparrd and llirn oil) to ilx e%iry of fix crape of anriv whreh arre aalhon,-ed T/rir irpori drier my gum-anier/&I no addriinnal errrrninmrohi!<rintwmirairnrr be)ond I&I dnenhed in this rrporY e ants at/he rrie ' P\211M\21417- itl l\Rcj)orts\Ird-14gtr doc