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• / _ CENTRAL VALLEY REGION _ <br /> 344 -.. <br /> 3 Rouac Rom„ <br /> .- Sacameaw.C?. 95827-3098 <br /> •� `� Rhone(916)55-3000 <br /> F.A.X(91!)55-3015 - • _. - °' •� <br /> 18 July 1997 <br /> Revised 30 August 1997 <br /> To Whom It Lfay Concern <br /> A1v4L.YSIS REQUIlZED FOR OXYGENATE COMPOUNDS USED IN CALIFORNIA <br /> GASOLINE-EPA METHOD 8260 (8240-B and 8020) <br /> Ata Jure 1997 meeting at the Department of Health Services in Berkeley, the statewide <br /> analytical methods committee for establishing analytical TPH and additive standards,was <br /> informed that oxygenate compounds,which may constitute a Threat to roundwatz*, other <br /> than tiiTBE, have been and are beim added to gasoline. Toe list incudes, in order of <br /> analytical identLacation: <br /> L Methanol <br /> 2. Ethanol <br /> 3. Tertiary Butyl Alcohol gBA) <br /> 4. MTBE <br /> 5. Di-isopropyi ether(TDIFE) <br /> 6. Ethyl Tertiary Buryl Ether(EI BE) <br /> 7. Tertiary Amyi Methyi Einer(TA1tiE) <br /> The first Three are alcohols and the latter four are ether compounds. Edhanol has been cased for <br /> several years in California. MTBE, as you lmow,has beers used as an octane enhancer additive <br /> since the late 1970s and is now used at a higher percentage as an oxygenate in gasoline. Now <br /> we have learned that,TAS has beers added to California fixes,since 1995- DIPE has been <br /> used on the East Coast,but recently has been found in Southern California ground water RVay <br /> 1997) and San Joaquin County-(Aua st 1997)- TBA has been found in ground water at a <br /> gasoline service station site in San Joaquin County(1100 ppb,August 1997). To date,we have <br /> 0 <br /> no information regarding the use of ETBE in C&Ufcr d. <br /> The introduction of these additives present analytical problems for laboratories bemuse the <br /> multiple analytes can co-elute from the column- For instance,TAS may co-elute with <br /> benzene in the EFAA020 analytical method common y used today. Therefore,we believe that <br /> �itass Spectrophotometry(MS) is the most definitive procedure to determine oxygenate <br /> compounds. MS will likely increase the cost of sample analysis;but,until another <br /> compre-henmve analytical method is developed that can disti�sh ber-weer the compounds, <br /> we iber;eve that EPA Method 8250 is the most reliable,readily available procedure sor <br /> laboratories. Completion of proposed studies on analytical procedures for ox<yg=*sate <br /> compounds by the Lawrence Livermore National Laboratory, under contract_to the State <br /> Water Resources Control Board, should provide additional guidance by early 1998. <br /> fi <br /> 3t�/cled?sec Ora'nvaion is m preex mrd aam+oe�madrly afCaLiforma'i:pars r'rsoraCr;.and <br /> aw"dim PmPa.adac=n mrd apdort ras far dee bargit aj arrd�rmor geee�ans. <br />