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a <br />Date: <br />09/12/97 <br />To: <br />Unit III <br />From: <br />Unit IV <br />RE: <br />Sampling protocol for Routine Tank Removals <br />Recent guidance from the CVRWQCI3 revised 30 August 1997 letter suggests EPA <br />Method 8260 as the method of choice for analysis of oxygenated compounds in <br />gasoline until a more appropriate method can be developed. The compounds that <br />should be reported using 8260 are Tertiary Butyl Alcohol (TBA), Methyl Tertiary Butyl <br />Ether (MTBE), Di -isopropyl ether (DIPE), Ethyl Tertiary Butyl Ether (ETBE) and <br />Tertiary Amyl Methyl Ether (TAME). Analysis of samples for MethanQI and Ethanol <br />should be required where there is reason to believe that these compounds were <br />stored in the underground tank(s). <br />We recommend the table entitled "Minimum Verification Laboratory Analysis" in the <br />Application for Permit to Close a LIST include sampling for oxygenates using EPA <br />method 8260. Beacon sites should be sampled for Ethanol in addition to the above <br />five oxygenates. Any sites with a methanol tank should be sampled for that fuel. <br />Sampling for oxygenates in soil and water using method 8260 is new for the <br />laboratories so detection limits may vary. The detection limit for the ethers in water <br />should be about 5 ppb and for the alcohols in water about 100 ppb. The detection <br />limit for ethers in soil should be between .01 and .05 ppm and for alcohols in soil <br />about 1 ppm. <br />ML/ss <br />09/12/97 <br />