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hI <br /> PUBLIC HEALTH SERVICES <br /> }O Ury <br /> SARI JOAQLTL I COLJN I Y <br /> ENVIRONMENM_kL HEALTH DIVISION <br /> Karen Furst, M.D ., M.P.H., Health Officerz <br /> 304 East Weber Avenue, Third Floor • Stockton, G4 95202 <br /> 209/468-3420 <br /> v <br /> SEP 2 Do <br /> To Whom It May Concern <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 (SWRCB) 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 (CVRWQCS). <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), Methyl Tertiary Butyl Ether (MTBE) , Di- <br /> isoprcpyi 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 far Methanol and <br /> Ethanal where there is reason to believe that these compounds were stared 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, RENS , Director <br /> Environmental Health Division <br /> i <br /> I U <br /> Margaret Lagario, REHS <br /> LOP Supervisor <br /> encl. <br /> A Division of San Joaquin County Health Cate Services <br />