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FROM FAX NO ' 2062835044 Oct 01 2002 10 52AM P2 <br /> } <br /> FRIEDMAN& BRUYA, INC. <br /> ENVIRONMENTAL CHEMISTS <br /> James E Bntya,Pb D 3012 16th Avenue West <br /> Charlene Morrow,M S Seattle WA 98119-2029 <br /> Yelena Aravhm M S TEL (206)285.8282 <br /> Bradley T Ben m,B S FAX (206)283-5044 <br /> Kurt khnson,13 S e-mail f i@tsome&a cora <br /> October 1, 2002 <br /> David Allen, Senior Project Manager <br /> Aqua Science Engineers, Inc <br /> 208 W. El Pintado <br /> Danville, CA 94526 <br /> Dear Mr.Allen <br /> 1 have reviewed the documents provided. These consisted of two analytical reports from <br /> Kiff Analytical LLC both dated September 19, 2002 with supporting data and a letter <br /> from Zymax dated August 10, 2001, with supporting analytical summary table and gas <br /> chromatographic traces I have reviewed these data to determine if there is evidence of a <br /> release of gasoline at this site that may have occurred in the last 3 or so years <br /> In my review of these data,I paid particular attention to any finduig of butane The <br /> temperature at which butane boils is slightly above the freezing point of water. Because <br /> of this,butane is often one of the first compounds lost when a gasohne is released into the <br /> environment <br /> Review of the Zymax data generated in 2001 shows that butane was only found in the <br /> sample of fuel obtained from the gas pump No butane was reportedly present in the <br /> product samples collected from the subsurface In the data.from 2002, Kiff Analytical <br /> reports finding butane in an air sample apparently collected from this este No butane <br /> appears to be present in the product sample that was also analyzed by Riff Analytical in <br /> 2002 <br /> Based on the data provided, there appears to be a Jughly degraded gasoline present at this <br /> site Had the site not been impacted by a vapor recovery system, the extent of <br /> volatilization losses would indicate that the gasoline is more than 3 years old However, <br /> because of the operation of a vapor recovery system, the rate of volatilization losses is <br /> greatly enhanced and could cause the extent of degradation seen in less than 3 years The <br /> current finding of butane m an air sample from the vapor recovery system strongly <br /> suggests that a release of less than 3 years has impacted this site This can be checked by <br /> examining the quantity of material removed by the vapor recovery system with the change <br />