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Mr. Nabil Saba - 2 - March 15, 2019 <br />The California Office of Environmental Health Hazard Assessment (OEHHA) recommends <br />interim notification levels for PFOA (based on liver toxicity, as well as cancer risks) and for <br />PFOS (based on immunotoxicity). Accordingly, on July 13, 2018, after independent review of <br />the available information on the risks, DDW established notification levels at concentrations of <br />13 parts per trillion for PFOS and 14 parts per trillion for PFOA. These levels are consistent with <br />OEHHA's recommendations. <br />Pursuant to Health and Safety Code section 116400, DDW is issuing the enclosed Order <br />requiring testing for PFOA and PFOS along with all additional analytes using in the approved <br />DDW testing methodology. As specified in the enclosed Order, your drinking water system <br />sources that are specifically listed in the order are at risk for potential contamination by PFAS <br />due to its proximity to adjacent facilities known to use, produce, or store PFAS. Additional <br />information is provided at: <br />http://waterboards. ca.gov/ofas <br />Any person who is aggrieved by this Order may file a petition with the State Water Board for <br />reconsideration of this Order. Information regarding filing petitions may be found at: <br />http://www.waterboards.ca.gov/drinking water/programs/petitions/index.shtml <br />DDW appreciates the hard work of the City of Santa Ana in maintaining safe drinking water at all <br />times. The information gathered from the enclosed Order will assist the State Water Board in its <br />mission to protect water resources and to address risks to health caused by PFAS in drinking <br />water. <br />In early April, DDW will provide a webcast training to provide additional information, share <br />guidance, and answer questions. Details will be sent as the training develops. <br />If you have any questions regarding this matter, please contact me at 714-558-4706, or at <br />Ashley. Dummer(c waterboards.ca.gov. <br />Sincerely, <br />Ashley Dummer, P.E. <br />Acting District Engineer <br />Santa Ana District <br />Enclosures: 1) PFAS Sampling Order 05 08 19M_011_3010038 <br />2) Appendix 1: DDW Drinking Water Sample Collection for Per and <br />Polynuorinated Alkyl Substances (PFAS) Sampling Guidance <br />19E-6 <br />