SITE INFORMATION AND CORRESPONDENCE

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Ni! „ ! 30 August 1997 oxygenate Analysis r Quarterly water samples for oxygenate compounds are to be taken from all monitoring wells at sites with 10 or fewer wells (supply wells and surface water may be included in the monitoring program , as appropriate,by the Regional Board or Local'implementing Agency). At sites with more than ten monitoring wells;ie quests to change the sampling procedure must be approved by the Regional.Board or Local Implementing Agency. Soil samples should be analyzed beneath the primary leak source(s) (tank,pipeline, or dispenser) at regular depth intervals to the groundwater interface. If only-MTBE is found in the initial sampling/analysis, Is as confirmed by 8260, the Responsible Party may continue analysis by EPA Method 8020 for the oxygenate. Prior to requesting site closure a "confirming round" for all oxygenate compounds must be completed. . .Laboratories must include all listed oxygenated standards (TBA and-Ethers)in their calibration standards and follow the QA/QC protocol detailed in EPA Methods 8000 and 8020,or 8240-B or 8260, and the Code of Federal Regulations (CFR Title 40, parts 136.4 and 136.5). In addition to the compounds discussed above, we have found that both Tertiary amyl ethyl ether (TAEE) and Isopropyl alcohol (IPA),WSPA, 19.97 data, also may be added to gasoline; and PRISTS (ethylene glycol monomethyl ether) is added to aviation fuel and, reportedly, some diesel fuels to prevent clogging of fuel'lines by,microorganisms. Prist is registered as a pesticide with anti-microbial properties: CASA 000109864. These compounds maybe added Ik to the analysis list as more information becomes available. If you have questions, please call John Noonan in Fresno at (209) 445-5350, Karen Cle ntsen in Redding at (916) 224-4852, or me in Sacramento at(916) 255-3139. G ON LEE BOGGS derground Tank rogram.Manager s