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• e r <br /> P.08 <br /> Oct-24-97 05:01P GHH Erneer•ing Inc <br /> 10-20-1997 1 :39Pt 1 FRO 1 <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD Ca1lEPA <br /> CENTRAL VALLEY REGION <br /> 3443 Acuorr Road,SBitc A _ _ <br /> Sacmmcaco,CA 95827-3099 <br /> Fb=e(916)255-3000 <br /> FAX(916)ZSS-3015 _ . �_= — p•• 2R Toty w8,oq cu...w <br /> 18 July 1997 <br /> Revised 30 August 1997 <br /> { lb <br /> To Whom It May Concern `��1 <br /> ANALYSIS REQUIRED FOR OXYGENATE COMPOUNDS USED IN CALIFORNIA <br /> GASOLINE-EPA METHOD 8260 (8240-B and sno) <br /> At a June 1997 meeting at the Department of Health Services in Berkeley,the statewide <br /> analytical methods com.-nittee for establishing analytical TPI-1 and additive standards,was <br /> informed that oxygenate compounds,which may constitute a threat to groundwater, other <br /> than MTBE,have been and are being added to gasoline_ The list includes,in order of <br /> analytical identification: <br /> 1. Methanol <br /> 2- Ethanol <br /> 3. Tertiary Butyl Alcohol ('IBA) <br /> A. MTBE <br /> 5. Di-isopropyl ether(DIPE) <br /> 6. Ethyl Tertiary Butyl Ether(ETBE) <br /> 7. Tertiary Amyl Methyl Ethe; (TAME) <br /> The first three are alcohols and the lattcr four are ether compounds. Ethanol has been used for <br /> several years in Califorrda. MIKE,as you knew,has been 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,TAME has been added to California fuels,since 1995. DIPE has been <br /> used on the East Coast,but recently has been found in Southern California ground water(May <br /> 1997) and San Joaquin County(August 1997)_ T$A has been found in ground water at a <br /> gasoline service station site in San Joaquin County(11o0 ppb,August 1997). To date,we have <br /> no information regarding the use of ETRE in California. <br /> The introduction of these additives present analytical problems for laboratories because the <br /> multiple analytes can co-elute from the mlumru For instance,TAME may co-elute with <br /> benzene in the EPA-8020 analytical method con=only used today. Therefore,we believe tl-sat <br /> Mass 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 /> comprehensive analytical method is developed that can distinguish between the compounds, <br /> we believe that EPA Method 8260 is the most reliable,readily available procedure for <br /> laboratories. Completion of proposed studies on analytical procedures for oxygenate <br /> compounds by the Lawrence Livermore Rational Laboratory,under contras,to the State <br /> Water Resources Control Board, should provide additional guidance by early 1998. <br /> Xee7errII Pone. <br /> 0--LO—LO—er rop —r ad eakwLtr der guwh jy of�sA/epur i..e+v ave.�r<+ esd <br />