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Mr Terry Tarditi <br /> October 13, 2005 <br /> Page 4 <br />' TPH-g. The only detection of TPH-g was in the sample from MW-3 at 50 ttg/L <br /> All other TPH-g concentrations were detected below their respective reporting <br />' hmits <br /> MtBE MtBE concentrations were detected in samples from all four monitoring <br /> t wells In MW-1, MtBE concentrations decreased from 87,000 dig/L in the second <br /> quarter 2005 to 65,000 µg/L this quarter Trace MtBE concentrations were <br /> detected in MW-2 at 0 56 µg/L MtBE concentrations decreased slightly from the <br />' second quarter 2005 levels in MW-3 from 47 µg/L to 35 µg/L and decreased in <br /> MW-4 from 740 µg/L to 390 µg/L <br />' Other Oxygenates. In addition to MtBE, other oxygenates were analyzed <br /> [diisopropyl ether (RIPE), ethyl-tertiary-butyl ether (EtBE), tert-amyl methyl ether <br /> (TAME) and tent-butanol] Concentrations of DIPE,TAME and tert-butanol <br />' were not detected in MW-1 above its detection limit of 100 µg/L DIPE and <br /> tent-butanol concentrations were not detected in MW-4 These analytes have been <br /> routinely detected in these two wells As in previous reporting, Kiff Analytical <br />'• applied a "f" flag to the MW-1 and MW-4 tent-butanol detections due to the low <br /> conversion of MtBE to tert-butanol during the analysis Kiff Analytical considers <br /> this conversion effect to be mathematically significant in samples that contain <br />' MtBE/tert-butanol in ratios of over 20 1 <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,August 16,2005 <br /> Figure 3 Groundwater Constituent Map,August 16,2005 <br /> Figure 4 MtBE Isoconcentration Map,August 16, 2005 <br /> Attachment A Field Data Sheets <br /> Attachment B Laboratory Analytical Reports <br /> 1 <br />' Thrr report upas preparrd in accordance unth the standardr of The enrrronmenial conrulirng industry at the time a warprepared li should not he <br /> retied upon by parties other than those for whom it was prepared and then only to the e-aeni of The scope of urork wh:eh wew aurb=,-ed Thcr <br /> report doer not guarantee that no additional enimonmental contamination beyond that dererbed:n the r report etirrir at The.rite <br />' P\27000\]279601 & r-trucking cw Monitonng 2005\Reports\3rd-05gtr doc <br />