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. UNITED STATES ENVIRONMENTAL PROTECTION AGENCY _.I,_z__ REGION IX PRO1 75 Hawthorne Street San Francisco, CA 94105.3901

OFFICE OF THE REGIONAL ADMINISTRATOR 

## APR 212014

The 1-lonorable Janice K. Brewer Governor ofArizona 1700 West Washington Street Phoenix, Arizona 85007 Dear Governor Brewer: The purpose ofthis letter is to notify you thatthe U.S. Environmental Protection Agency (EPA) intends to redesignate the 1—layden area as “nonattainment” forthe 2008 lead (Pb) national ambient air quality standard (NAAQS). Reducing levels oflead pollution is an importantpart of the EPA’s commitmentto a clean, healthy environment. Lead exposure can cause arange of adverse health effects, most notably in children. Exposures to low levels oflead early in life have been linked to effects on Intelligence Quotient, learning, memory, and behavior. In orderto ensure thatpublic health and welfare are protected, the EPArevised the leadNAAQS on October 15, 2008, lowering it from the 1.5 micrograms percubic meter (ig/m 3 ) level set in 1978 to a level of0.15 ig/m 3

. On .lune 12, 2013, I sent you a letter informing youthatthe EPAhad determined that arevised designation forthe 2008 Pb NAAQS would be necessary forthe 1-layden area. Our determination was based on violations ofthe Pb NAAQS recorded in the 1-layden area. Thankyou for your September 25, 2013 letter, in which you notedthe installation ofadditional pollution controls at the Asarco Hayden copper smelter and recommendedthatthe arearetain its unclassifiable designation unless additional violations occurred. We have reviewed yourrecommendation and evaluated the technical support document submitted by the ArizonaDepartment of Environmental Quality on October4, 2013. We have also considered more recentmonitoring datarecorded atADEQ’s Globe 1-Jighvay monitor along with additional ambient airquality data gathered by Asarco’s more extensive monitoring network inthe late summer and fall of2013. Based on ourreview ofthe available information, the 1-layden areais violating the Pb standard. Accordingly, we are proposing to redesignate the Hayden areato nonattainment, as described in the enclosed analysis. A pre-publication copy ofthe notice inviting public comment on our proposal is also enclosed. It will be published in the Federal Register in the near future. Should you have additional information that you wish to be considered by the EPA in this process, please provide it to us by June 20, 2014, as we intend to make afinal decision regarding redesignation forthe Hayden areaforthe 2008 PbNAAQS inJuly 2014.

Printed on Recycled PaperIf after considering public comment, we finalize our redesignation for the Pb NAAQS for the Hayden area, the EPA will work with your staff to develop an appropriate state implementation plan to assure the public health protections intended by the standard. Your air quality staff may wish to contact Deborah Jordan, Air Division Director at 415-947-8715 or Colleen McKaughan. Associate Air Division Director at 520-498-0118. Sincerely, Jared Blumenfeld Enclosures cc: Henry Darwin. Director, Arizona Department of Environmental Quality Eric Massey, Air Director, Arizona Department of Environmental Quality Michael Sundhloorn, Director, Pinal County Air Pollution Control District 2