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Oxygenate Analysis 3 • 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 (CPR 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 /> Z <br /> uestions, please call John Noonan in Fresno at (209) 445-5550, <br /> n in Redding at (916) 224-4852, or me in Sacramento at(916) 255-3139. <br /> OGGS <br /> nk <br /> r <br />