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DRAFT <br />Dear Property Owner, <br />San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) is <br />providing notification to you that groundwater in the area of Wilcox Road south of Waterloo <br />Road has been impacted with chlorinated hydrocarbons from an unidentified source, in <br />excess of the State of California Drinking Water Standards. The constituents detected from <br />private well testing are the following: <br />1,1-Dichloroethane (DCA) <br />1,1-Dichloroethene (DCE) <br />PHS/EHD is overseeing the investigation of the former underground storage tank (UST) <br />located at 4648 Waterloo Road. During the course of groundwater monitoring, the above <br />organic compounds unrelated to the UST investigation, were detected in the public water <br />supply well serving the tenants in the Marlowe Business Park. PHS/EHD, with the <br />cooperation of the various neighboring residences and businesses, conducted a well survey <br />identifying private water sources within a specified geographical range and/or radius. <br />Although public water standards do not apply to private wells, you may wish to have your <br />private well tested, utilizing EPA Method 502, in order to be assured that the chemical <br />compounds which have been detected in the area of Wilcox Road south of Waterloo Road, <br />have not impacted your well. Attached is a list of California state certified laboratories that <br />can perform the analysis. <br />If you choose to test your private well, PHS/EHD will provide interpretation of the analytical <br />results. If you have any questions, please contact Mary Meays, Senior REHS, of my staff <br />at (209) 468-0337 or Diane Hinson, Supervising REHS at (209) 468-3452. <br />Jogi Khanna, M.D., M.P.H. <br />Health Officer <br />DRAFT <br />Ron Valinoti, REHS, Director <br />Environmental Health Division <br />c: Wendy Cohen, Central Valley Regional Water Quality Control Board <br />c: Mike Camy, California Water Services <br />c: California Department of Health Services, <br />Division of Drinking Water and Environmental Management <br />c: Laurie Cotulla, PHS/EHD <br />wp\diane\ofsitmar.ltr <br />.•