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Z <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 performia; 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 /> 6 <br /> �} Rec,.c.'ed Paper Our mrsrort is to preserve and enhance the quality at;Califorma's xater resources,and <br /> L enrure their prover ailx—a:ron and zlfic:ent use jar:he oengtit of present and fwure generatsorm <br />