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-�-- F CaUEPA <br /> CALIFORNIA REGAL y�ATER QUAL[TY CO i <br /> ' CENTRAL VALLEY REGION i� ` <br /> e <br /> 3443 ROuti Road,-Suite A <br /> Sacramento, CA 9582:-3098 <br /> •'••�`°' Phone (916) 255-3000 Fctz wL-.M Gaver-r <br /> FAX(916) 253-3012 <br /> 18 July 1997 - <br /> 1 <br /> To Whom It May Concern <br /> 'E <br /> AALYSIS REQUIRED FOR OXYGEN: ATE COMPOUNDS USED IN CkLIFORNZA <br /> N <br /> GASOLINE - EPA METHOD 82,60 <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 compounds, other than MTBE, have been and are be.n' added to California <br /> i gasoline which may constitute a threat to groundwaters. The list includes,in order of <br /> analytical identification: <br /> 1. Methanol <br /> 2. Ethanol <br /> �. Tertiary Butanol <br /> 5. Di-isopropyl ether (DIPE) <br /> 6. Ethyl Tertiary Butyl Ether (ETBE) <br /> 7. Tertiary Amyl Methyl Ether (TAME) <br /> T'ne first three are alcohols and the latter four are ether compounds. Ethanol has been used for <br /> several years in California. MTBE, as you know, has been used as an octane enhancer additive <br /> since the late 19'70s and is now used at a'nigher percentage as an oxygenate in gasoline. Since <br /> 1995, TAME, manufactured by Chevron,has been added to California fuels. DIPE has been <br /> used on the East Coast,but.recently has been found in Southern California ground water (May <br /> 1997). To date, we have�no information regarding the use of ETBE in California_ <br /> The introduction of these additives present analytical problems for laboratories because of the <br /> number of analyses required and 'internal interference. For instance,TAME is difficult to <br /> distinguish because it'co-elutes with benzene in the EPA-8020 analytical method commonly <br /> used today. Therefore,the analytical methods committee concurred that EPA-8260 is required <br /> to determine which compound has been used. This analytical method will likely increase the <br /> cost of sample analysis;but, until another comprehensive analytical method is developed that <br /> can distinguish between the compounds,EPA 8260 is the single,provisional method of <br /> analysis for these compounds. <br /> This problem is fT her compounded because the oil refineries ship gasoline around the state <br /> and then trade gasoline between g-evrraphic aFe-as. For instance,:f gasoline is needed the <br /> 1 San Francisco Bay area by Shell,Shell will obtain some gasoline from, say, Chevron in the Bay <br /> area and, in exchange, Chevron will receive some Shell gasoline in Southern California. The- <br /> Paper <br /> hePaper Our mission is to pr=—67td—a-the aualuv al Callfarmes wirer Y- awv= and <br /> erztta a:heir?97 DDS a!lacan and djT&-m Vsz far the b mvit of craear 6710=we g=cratia7r.. <br />