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AMBRIA <br /> CLOSING <br /> As mentioned in our December 19, 2004 Site Investigation Report, we reconunend groundwater <br /> samples collected at this site only be analyzed for total petroleum hydrocarbons as gasoline <br /> (TPHg), benzene, toluene, ethylbenzene, xylenes (BTEX), methyl tertiary butyl ether (MTBE), <br /> tertiary butyl alcohol (TBA), and 1,2-dichloroethane (1,2-DCA) We believe analysis for ethyl <br /> tertiary butyl ether (ETBE), di-isopropyl ether (DIPE), tertiary amyl methyl ether (TAME) and <br /> ethylene dibromide (EDB)are not necessary at this site a7e-{ <br /> The release at this site likely occurred prior to the introduction of fuel oxygenates in to gasoline <br /> and therefore fuel oxygenates should not be present as a result of this release The presence of <br /> TBA in groundwater beneath this site is anomalous, especially without MTBE being detected <br /> We believe TBA may onginate from an offsite source We will implement these sampling <br /> changes once we have approval from San Joaquin County Environmental Health Department <br /> staff to do so <br /> If you have any questions regarding the contents of this document, please call Joe Neely at <br /> (707)933-2361 <br /> Sincerely, <br /> Cambria Environmental Technology, Inc. <br /> �" L' t c-� <br /> Susan Lukaszewicz <br /> Staff Geologist <br /> Q GEk&111— 0 <br /> O <br /> a <br /> Joe W Neely,RG <br /> Senior Protect Geologist a No 6927 ° <br /> RG 6927 <br /> OF <br /> 1660 2 <br />