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iy <br /> ,,••OF CALIFORNIA REGIONS'. 'NATER QUALITY CONTROL BOARD Cal/EPA <br /> CENTRAL VALLEY RiON <br /> 3443 Routier Road, Suite A _ . . <br /> Sacramento, CA 95827-3098 <br /> �'..f,",� Phone(916)255-3004 <br /> FAX(916)255-3015 Li 7 c� <br /> �. _N7 <br /> Pate V son,Goverwr <br /> 18 July 1997 a <br /> Revised 30 August 1997 +" r ,y <br /> To Whom It May Concern <br /> ANALYSIS REQUIRED FOR OXYGENATE COMPOUNDS USED IN CALIFORNIA <br /> GASOLINE - EPA METHOD 8260 (8240-B and 8020)' <br /> At a 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: ' <br /> 1. 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 (TAME) <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 r <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 intiSouthern 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 ETRE in Califon-da". <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. 1 <br /> Recycled Paper Our mission is to preserve and enhance the quality of California's water resow-ces,and <br /> ensure their proper allocation and of tcient use far the benefit of present and future generations. <br /> i <br /> i <br />