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-, ,�•�� CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD 4uWLl i; <br /> CENTRAL VALI, REGION <br /> 3443 Routier Roa4;8uite A <br /> Sacramento, CA 95827-3099 t <br /> Phone(916)255-3000 <br /> FAX(9 16) ZSS-3015 ,� o h,, f. ., Pete Rrison,Gwenz <br /> y F <br /> - y I <br /> h <br /> 18 July 1997 <br /> Revised 30 August 1997 <br /> To Whom It May Concern <br /> ANALYSIS REQUIRED FOR OXYGL FATE COMPOUNDS USED IN CALIFORNIA <br /> GASOLINE- EPA METHOD 8260 (8240-B and 8020) <br /> Ata June 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 groundwater, other <br /> than MTBE,have been and are being added,to gasoline. The list includes, in order of <br /> analytical identification: 4 <br /> I. Methanol <br /> 2. Ethanol <br /> 3. Tertiary Butyl Alcohol (TBA) <br /> 4. MTBE <br /> 5. Di-isopropyl ether (DIPE) <br /> 6. Ethyl Tertiary Butyl Ether (ETBE) <br /> 7. Tertiary Amyl Methyl Ether (TA.&M <br /> The 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 1970s and is now used at a higher percentage as an oxygenate in gasoline_ Now <br /> we have learned that,TA11vffi has been added.to California fuels,since 1995. DIPS has been <br /> used on the East Coast,but recently has been found is Southern California ground water (May <br /> 1997) and San Joaquin County-(August 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 /> no information regarding the use of ETBE in California. <br /> The introduction of these additives present analytical problems for laboratories because the <br /> multiple analytes can co-elute from the column. For instance, TAME may co-elute with <br /> benzene in the EPA-8020 analytical method commonly used today. Therefore,we believe that <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 National Laboratory, under contract to the State <br /> Water Resources Control Board,should provide additional guidance by early 1998. <br /> Recycled Paper Our mission is to pr=&W mid enhmeee sloe quality of cdwfornia's wiauar mow=.mid <br /> 9"S""their proper allo=don and gUicient use for the bewit of pram mod fiaxor gmemnans. <br />