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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD- CQI/EPA <br /> CENTRAL VALLEY p -GION <br /> (: 3443 Rontic Road 3ui <br /> SamCA 95827-1098 <br /> • 'w`" Phone(916)(916) 2:55-3000 - <br /> FA.X(916)255-3015 <br /> °:Te Wilton.Ga ermr <br /> 18 July 1997 <br /> To Whom It-VIay Conceal <br /> AiNALYSIS REQUIRED FOR OXYGE ATE COMPOUNDS USED Ilii CALIpORN-IA <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 esablis , <br /> g anal <br /> ycaTPFi and additive standardswas informed that <br /> oxygenate compounds, other han_NME,have been and are being added to California <br /> gasoline which may constitute a threat to groundwaters. The list includes,in order of <br /> analytical identiacation: <br /> 1. Methanol <br /> 2• Ethanol <br /> 3. Tertiary Butanol <br /> g. NME <br /> 5. Di-isopropyl ethe--(DTE) <br /> 6. Ethyl Tertiary Butyi Ether (EIRE) <br /> 7. Tertiary Amyl?fiehyi Ether, (T.�u'd) <br /> ee first three are alcohols and the latter f <br /> sour are e..her comroun ids. EzhanOl has beenused for <br /> several years in California. �MrBE, as you-mow,has been used as an octane enhancer additive <br /> since the late 1970s and is now used at a higher percentage as an oxygemte in gasoline. Since i <br /> 1995, T-kLME, manufacrttred by Chevron,has been added to California foes. DIPE has been <br /> used on he East Coast,but.:ecently has been found in Southern California e?ourt ( <br /> 1997). To date, we have no information regarding he use of ETBE in California <br /> d water titay <br /> The introduction of these additives present analytical problems for laboratories because of the <br /> number of analyses required and irate--nal interference. For mstance,TANE { <br /> distinguish because it CO-elutes with benzene m the EPA-80-70 method commonly t <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 Mcely increase the <br /> ccs of sample analysts;but, until another comprehensive analytical method is developed that <br /> can arstlnj.iish between the compounds, EPA 8260 s he single,provisional method of <br /> analysis for hese compounds. <br /> This problem is further compounded because the oil refineries shin gasoiine around the state I <br /> and hen trade gasoline between o oa aphic mss. For instance,if gas <br /> is needed-in the <br /> San 'Francisco Bay area by She-,Shell will obtain some gasoline from, say, Chiron in the Bav <br /> area and, in excaange, Chevron will receive some She-17 gasoline in Southern California. The <br /> 0 <br /> ra <br /> ertive:ireapvo�y(w�meld epi The=v IaY%Crtiformez-.mmrau+neq mid <br /> mrd 9+T.'�usejm-:eel ao�nit of mrsea mrd,,jameK . <br />