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Oxygenate Analysis "..W3 30 August 1997 <br />Quarterly water samples for oxygenate compounds are to be taken from all monitoring wells <br />at sites with 10 or fewer wells (supply wells and surface water may be included in the <br />monitoring program, as appropriate, by the Regional Board or Local Implementing Agency). <br />At sites with more than ten monitoring wells, requests to change the sampling procedure must <br />be approved by the Regional Board or Local Implementing Agency. Soil samples should be <br />analyzed beneath the primary leak source(s) (tank, pipeline, or dispenser) at regular depth <br />intervals to the groundwater interface. If only MTBE is found in the initial sampling/ analysis, <br />as confirmed by 8260, the Responsible Party may continue analysis by EPA Method 8020 for <br />the oxygenate. Prior to requesting site closure a "confirming round" for all oxygenate <br />compounds must be completed. <br />Laboratories must include all listed oxygenated standards (TBA and Ethers) in their calibration <br />standards and follow the QA/QC protocol detailed in EPA Methods 8000 and 8020, or 8240-B <br />or 8260, and the Code of Federal Regulations (CFR Title 40, parts 136.4 and 136.5). <br />In addition to the compounds discussed above, we have found that both Tertiary amyl ethyl <br />ether (TAEE) and Isopropyl alcohol (IPA), WSPA,1997 data, also may be added to gasoline; <br />and PRISTO (ethylene glycol monomethyl ether) is added to aviation fuel and, reportedly, <br />some diesel fuels to prevent clogging of fuel lines by microorganisms. Prist is registered as a <br />pesticide with anti -microbial properties: CAS# 000109864. These compounds may be added <br />to the analysis list as more information becomes available. <br />If you have � questions, please call John Noonan in Fresno at (209) 445-5550, <br />Karen Cle , ntsen in Redding at (916) 224-4852, or me in Sacramento at (916) 255-3139. <br />J LEE BOGGS <br />)und Tank <br />Manager <br />