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Mr Terry Tarditi <br /> August 19, 2004 <br />' Page 4 <br /> i <br />' MW-3 and MW-4,MtBE concentrations increased from the fourth quarter 2003 <br /> levels (6 6 }rg/L to 38 4g/L) and (400 R/L to 570 µg/L) respectively, however, <br /> these concentrations are within the historic range <br />' Other Oxygenates. Duso ropY1 ether CIPE)> ethyl-tertiary-butyl ether CtBE , <br /> tert-amyl methyl ether (TAME) and tert-butanol were not detected in the samples <br /> from MW-2 and the Supply Well Concentrations of DIPE were detected in <br /> samples from MW-1 and MW-4 at 38 µg/L and 1 8 µg/L respectively <br /> Concentrations of EtBE above the reporting limit were not detected in any of the <br />' samples TAME was detected in the sample from MW-1 at 67 µg/L Detectable <br /> concentrations of tert-butanol were reported in samples from MW-1 and MW-4 at <br />' 2,300 µg/L (an historic high) and 7 5 µg/L, respectively As in previous reporting, <br /> Kiff Analytical applied a "J" flag to the MW-1 and MW-4 detections due to the <br /> low conversion of MtBE to tert-butanol during the analysis Ijff Analytical <br /> considers this conversion effect to be mathematically significant in samples that <br /> contain MtBE/tent-butanol m ratios of over 201 <br /> The following documents are enclosed with this letter <br /> Table 1 Historical Groundwater Elevation Data <br /> Table 2 Groundwater Flow Direction and Gradient <br /> Table 3 Historical Groundwater Analytical Data <br />' Figure 1 Site Map <br /> Figure 2 Groundwater Elevation Map,June 17, 2004 <br /> Figure 3 Groundwater Constituent and Benzene Isoconcentration Map, <br /> June 17, 2004 <br /> Figure 4 MtBE Isoconcentration Map,June 17,2004 <br />' Attachment A Field Data Sheets <br /> Attachment B Laboratory Analytical Reports <br /> This report nays prepared in ar ardance with the standards of the enlaronmental ronsubrng industry at the time it was prepared 1t shomid not be <br />' rehed upon hyparties other Than those jor whom it upas prepared,and then anly to the extent of the scope of anrk which airs authonS d Thm <br /> report does not8marantee That no ad4ttonal enaronmental contamination beyond That desenhed in thzs report exists at the site <br /> P\21000\21417-T&T\Reports\2nd-04grr doc <br />