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fM. <br /> PUBLIC h-1EALTH SERVD&ES oP.a• ,� <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 35202 4t:J�o.R�, <br /> 2491468-3420 <br /> SEP 2 5 X997 <br /> To Whom It May Concem <br /> ANALYSIS REQUIRED FOR OXYGENATE COMPOUNDS <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) is under <br /> Local Oversight Program (LOP) contract with the California State Water Resources Control <br /> Board (SWRCS) to provide oversight for the investigation and cleanup of unauthorized releases <br /> from underground storage tanks. This contract includes a provision for technical support by the <br /> California Central Valley Regional Water Quality Control Board (CVRWQCB)_ <br /> PHS/EHD has recently received a letter from the CVRWQCB that provides guidance on how to <br /> analyze for the oxygenated compounds in gasoline until a "definitive protocol" can be <br /> established. Based on this letter, PHS/EHD is directing you to analyze samples from all of <br /> your monitoring wells for Tertiary Butyl Alcohol (TBA), Methyi Tertiary Butyl Ether (MTBE), Di- <br /> isopropyl ether (DIPE), Ethyl Tertiary Butyl Ether(ETBE) and Tertiary Amyl Methyl Ether <br /> (TAME) by EPA method 8260. PHS/EHD will require analysis of samples for Methanol and <br /> Ethanol where there is reason to believe that these compounds were stored in the underground <br /> tank(s). <br /> PHS/EHD requires quarterly sampling of all wells where the presence of oxygenates is <br /> confirmed by EPA method 8260. Modification of this required sampling such as number of wells <br /> sampled, sampling frequency and method of analysis may be granted only after initial sample <br /> results are reviewed by PHS/EHD. Any modification of the required sampling must have <br /> PHS/EHD approval prior to implementation. <br /> For additional information please call your LOP contact. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Margaret Lagorio, REHS <br /> LOP Supervisor <br /> encs. <br /> A Division of San Joaquin County Health Care Services <br />