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Memo <br /> Date: 09/12/97 <br /> To: Unit III <br /> From: Unit IV <br /> RE: Sampling protocol for Routine Tank Removals <br /> Recent guidance from the CVRWQCB 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(ETRE) and <br /> Tertiary Amyl Methyl Ether(TAME). Analysis of samples for Methanol 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 UST 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 /> Muss <br /> 09/12197 <br />