SITE INFORMATION AND CORRESPONDENCE FILE 2

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Voice(209)468-0337 Fax(209)468-3433 JoaquinSan Environmental Health Memo To: Margaret Lagorio, Supervisor From: Mary Meays, Senior REHS CC: Date: July 28, 1997 Re: Sample results for MTBE testing I have summarized my telephone conversations with the Department of Health Services, Office of Drinking Water. John Berg, Engineer (510) 540-2159. He stated that in the 97-003 Office of Drinking Water Implementation Policy for MTBE, is the statement that vulnerable water systems must test for MTBE regardless of their waiver status. With large water systems, if not identified as vulnerable, MTBE analysis will not be conducted until the next regular VOC analysis. He stated that the Water Quality ManagementtMonitoring (WQM) Database which is managed by the Health and Welfare Data Center (HWDC) is updated at least every six months though he related an example when he was looking in January for some information and data from December had already been entered. He stated that the database could be accessed to get the results of testing which would include all the wells in San Joaquin County and who operates the well. He stated that the information for small water systems is not so organized since each small water system pays a yearly permit of$407 that just pays for 6 hours of time. He stated that DTSC is working on the risk assessment for MTBE and the interim action level is 35 ppb for DHS, EPA draft level of 70 ppb, and taste and odor levels reported at 15-45 ppb. He did indicated that while Primary standards were related to health effects and Secondary standards were related to ascetics that secondary standards were enforceable. Although for naturally occurring compounds a waiver could be obtained, if the water service surveys their customers. During a supplemental conversation. John stated that using the store-it code for MTBE (A-030) he could not find any MTBE information for wells in San Joaquin County(County Code: 39) 1 spoke with Joe Spano, (209) 948-7696. 1 requested a list of all the large water wells and MTBE results. He explained about the waiver business which would allow a well not to be sampled for VOCs for up to 6 years. I reiterated about the issue of vulnerable and he offered to provide a GIS map and help with locating the wells so that cross references could be made. An appointment was made for 2:00 PM today. 304 East Weber Avenue,Third Floor,Stockton CA 95202