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i M <br /> w <br /> to me. I don't have the answer right now. Thanks for your inqu y. <br /> Jim Barton <br /> (916) 255-3115 <br /> James L.L. Barton, R.G. <br /> Engineering Geologist <br /> California Regional Water Quality Control Board - Central Valley <br /> Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827 <br /> i <br /> phone (916) 255-3115 <br /> fax (916) 255-3439 <br /> "The energy challenge facing California is real. Every Californian <br /> needs to <br /> take immediate action to reduce energy consumption. For a list of <br /> simple <br /> ways you can reduce demand and cut your energy costs, see our Web-site <br /> at http://www.swrcb.ca.gov <br /> >>> "Vicki McCartney" <vmccartney@sjcehd.com> 02/10/03 09:55AM >>> <br /> Jim, <br /> I have some questions concerning analytical methods and how the <br /> methods <br /> are performed in the laboratories. These questions concern EPA method <br /> 8015B and methods used to analyze air samples. <br /> It is my understanding that when analyzing samples for diesel and <br /> motor <br /> oil by EPA method 8015B, that a five-point curve is run for each <br /> compound, diesel and motor oil, and the concentrations reported for <br /> diesel and motor oil are based on the five-point curve and the fuel <br /> fingerprint. Recently I was told by a chemist that SW-846 method <br /> 8015B <br /> is being performed by running a curve that includes Carbon 8 through <br /> Carbon 40. Then the average response factor is calculated for diesel <br /> and motor oil by taking an area and dividing by the concentration. <br /> Although the laboratory is certified by the State of California to <br /> perform method 8015B, the person whom I spoke to at the laboratory was <br /> not certain that the laboratory was certified to perform method 8015B <br /> by <br /> this modification. I have spoken to Ida at the State of California <br /> Environmental Laboratory Accreditation office and Ray Anderson at the <br /> EPA Methods Information Communication Exchange (MICE) Service, but I <br /> did <br /> not get a definitive answer from either person. <br /> My other concern is about the methods being reported by laboratories <br /> and consulting firms for analyzing air samples for BTEX, gasoline, and <br /> fuel oxygenates. I have seen methods 8020/8021, 8260B, and LUFT <br /> reported for air analyses. I am not aware, with the exception of <br /> 8260B, <br /> that these methods can be used for air samples. Please clarify. <br /> I look forward to hearing from you concerning the application of these <br /> methods. <br /> Vicki McCartney, SJCEHS <br /> 304 E. Weber Avenue <br /> Stockton, CA 95202-2708 <br /> Phone (209) 468-3456 <br /> Fax (209) 468-3433 <br /> vmccartney@sjcehd.com <br /> 2 <br />