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� v <br /> 2 <br /> • We suggest that analytical laboratories perform an "interference check" analysis of 3- <br /> methylpentane and 2-methylpentane standards in the presence and absence of <br /> MTBE. This test will evaluate whether these compounds co-elute with MTBE under <br /> the routine conditions used for performing EPA 8020A (or 8021B) analysis in <br /> individual laboratories. <br /> If you have any questions or comments on this or other matters related to this request, <br /> please call Kim Ward of my staff (916) 227-4319. <br /> Attachments <br /> cc: Anne Happel, LLNL <br /> 7� Reryded Pacer Our mission rs ro preserve and enhance the qualhy of CaGforma's waver resources,and <br /> `C ensure their proper adocaaon and eficienr use;or rhe bengit of present and future generations. <br />