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CALIFORNIA RE AL WATER QUALITY CONTROL SOAR Cal/EPA <br /> CENTRAL VALLIGION \ <br /> 3443 Rouricr Road.Suis A <br /> Sacr==W,CA 95827-3098 <br /> horm(916) 55-3000 ?em W SM Gavemr <br /> FAX(916)255-3015 <br /> 18 july 1997 - <br /> To Whom It May Conc°_n*n <br /> ANALYSIS REQUnUD FOR OXYGENATE COMPOUN-DS USED IN CALIFORNIA <br /> GASOLINE- EPA METHOD 8260 <br /> At a recent meeting at the Department of Health Services in Berkeley,the statewide analytical <br /> methods committee for establishing analytical TPH and additive Standards, was informed that <br /> oxygenate GpmDp„nds other than MTBE,have been and are being added to California <br /> gasoline which may constiiute a threat to ;oundwaterss. The list includes, in order of <br /> analytical identification: <br /> 1. Methanol <br /> 2. Ethanol <br /> I Tertiary Butanol <br /> a, MTBE <br /> 5. Di-isopropyl ether (Dther(ETRE) <br /> 6. Ethyl Tertiary Bury <br /> 7. Ter`sary Amyl Methyl.Ether (TA\4 <br /> The first three are alcohols and the latter four are ether compounds- Eihanol has been used for <br /> several years in Califorr a. MTBE, as you chow, has be�11 used as an m c gasoline. Since <br /> ee <br /> since the late 1970s and is now used at a higher percentage as an oxyo <br /> enate 1995,TAl ,manufacused by Chevron,has been added to California fuels_ DIFE has been <br /> used on the East Coast,butzecently has been found in Southern Califoulia ground water (May <br /> 1997). To date,we have no information regarding the use of=E in California. <br /> The introduction of the additives present analytical problems for laboratories because or'the <br /> number of analvses required and internal interference. For instance,T.AME is difficult to <br /> distdnowish because it co-elutes with benzene in the EPA-8020 analytical method commonly <br /> used today. Therefore,the analytical methods committee con==ed that EPA-8260 is regiired <br /> to determine which compound has been used This analyte cal method is developed that <br /> cost ore sample analysis;but,until another <br /> comprehensive Q ovisional method of <br /> can distiuish en ngbetwethe compounds,EPA 8260 is d1e sin�Ie pr <br /> analysis for these comoounds. <br /> This problem is further compounded because the oil refineries s''Zip gasoline around the state <br /> and then trade gasoline between oec-gnphic s. For instance,if gasoline s needed in the <br /> �-a <br /> evron in the <br /> San Francesco Bay area by SneIl,Shell will obtain some Baso line inmouthe *n1California. They <br /> area and, in exchange, Chevron will receive some Shell <br /> '• o Ory rrus$on s ra pre and ourmrrr rhe==UY of Gfifondes:Marc arvaet.mrd <br /> 2eryced.enm •' 'roc:tie umait aj mesem mrd iimve,ore+�°"t <br /> actrve:irev avow allarmrian and efcar . <br />