SITE INFORMATION AND CORRESPONDENCE

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Oct-24-97 05eO1P GHH F�gineering Inc - P. 10 -10-20-1997 t :40Pt•l •..oe P.5 y.-c-sm Analysis 3 30 Avg 199 Quarterly water samples for oxygenate compounds are to be taken from all mordtoring 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,reauests to cha'ige the sampling procedure must be approved by the Regional Board or Local Impleuirttting 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, as confirmed by 8260,the Responsible Party may continue analysis by EPA Method 8020 for the oxygernate. 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). hi addition to the compounds discussed above,we have found that both Tertiary amyl ethyl ether (TAEE) and Isopropyl alcohol (IPA),WSPA, 1997 data,also may be added to gasoline; and PRISTO(ethylene glycol monomethyl ether) is added to aviation fuel and,reportedly, some diesel fuels to prevent clogging of fuel lines by microorganisms. Pnst is registered as a pesticide with anti-microbial properties: CAS#000109864. These compounds may be added to the analysis list as more information becomes available. z uestions,please ca.il John Noonan in Fresno at(209) 445 5550, n in Redding at (916) 224-4852,or me in Sacramento at(916)255-3139. OGGS rek er