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— ) UNITED STATES ENVIRONMENTAL PROTECTION AGENCY _____

REGION IX 75 Hawthorne Street San Francisco, CA 94105-3901 

## JUN 122013 OFFICE OF THE REGIONAL ADMINISTRATOR The Ilonorable Janice K. Brewer Governor ofArizona 1700 West Washington Street Phoenix, Arizona 85007 Dear GovernorBrewer: I am writing to notify you that available lead monitoring data indicate that the air quality designation for the hayden area, which is currently designated unclassifiable, should be revised to nonattainment forthe 2008 lead national ambient air quality standards (NAAQS). Reducing levels oflead pollution is an importantpart ofthe U.S. Environmental Protection Agency’s (EPA) commitment to a clean, healthy environment. Lead exposure can cause arange ofadverse 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 EPA revised the leadNAAQS on October 15, 2008, lowering it fromthe 1.5 micrograms per cubic meter (ig/m 3 level set in 1978 to a level of0.15 ig/m 3

. See 73 FR 66964. An area violates the revised standards ifany arithmetic 3-month mean concentration is greaterthan 0.1 5tg/m 3

. On December 15, 2009, in accordance with the process set out in CAA section 107(d)(1). Arizona submitted its recommended designations forthe revised standard to the EPA. At that time, preliminary monitoring data indicated that the Hayden area, within which Asarco is the single significant source of lead emissions, was violating the new standard. You recommended that the EPA delay designating the Hayden area based on a written commitment from Asarco to improve its control oflead emissions. You furtherrecommended that the EPA promulgate a nonattainment designation forthe Hayden area if, despite Asarco’s etforts, the area continued to violate the lead NAAQS on or after March 2010. Subsequently. the Arizona Department ofEnvironmental Quality (ADEQ) recommended that, ifthe EPA were to determine that monitored concentrations in the areawere exceeding the standard, the EPA should follow your recommendation to promulgate a lead nonattainment areawith boundaries identical to the Hayden sulfur dioxide nonattainment areaboundaries withrespectto State lands. The EPA designated an area with the boundaries you recommended as unclassifiable because data indicating violations ofthe 2008 lead NAAQS in the Hayden area were still preliminary atthe time offinal designation. In her November 8, 2011 letter informing you ofthe EPA’s decision to designate the Hayden area unclassihable. EPA Administrator LisaJackson advised you that, should we subsequently determine that the lead standards are being violated, we would initiate the process to redesignate the Hayden areato nonattainment. Quality assured, certified monitoring datanow available indicate that three—month rolling average values violated the lead standards for February-April, March-May. and April-June 2012, leading

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### us to conclude thatthe designation ofthe Hayden area should be revisedto nonattainment. See Enclosure

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### 2012 Pb Design Values, ADEQ’s Globe Highway Monitor (AQS ID 04-007-1002). Under section 107(d)(3)(B) ofthe 

### Clean AirAct, yourrecommendation forthe area (or areas) you considerto be appropriate forredesignation is due 120 days after youreceive 

### this letter. The EPA’s guidance regarding the factors to considerwhenestablishing nonattainment areaboundaries is included in the November 12, 

### 2008 Federal Registernotice that finalized revisions to the leadNAAQS. See 73 FR 66964 at 67032. The EPA may make 

### modifications to the recommended designations and boundaries as it deems necessary (CAA section 107(d)(1)). Ifwe believe modifications are 

### appropriate, we will notify you at least 60 days priorto taking any final action, which will provide an opportunity for you to comment on any changes thatthe EPAproposes to yourrecommendation. A state with an areathat is redesignated to nonattainment is required to submitto EPA within 1 8 months a state implementation plan demonstrating howthe area will attainthe lead standards as expeditiously as practicable, but no laterthan five years afterdesignation. We lookforward to continuing to work with you and your staffto ensure appropriate designations and area boundaries are established, and to assistyour staffwith the development ofaplan thatwill help realize the public health protections intended by the standards. Your airquality staffmay contact Deborah Jordan, Air Division Director, at (415) 947-8715 or Colleen McKaughan, Associate Air Division Director, at (520)498-0118 ifthey need additional information. Sincerely,

dBl.ieifeld Enclosure

cc: 1-lenry Darwin, Director, ArizonaDepartment ofEnvironmental Quality Eric Massey, Air Director, Arizona Department ofEnvironmental Quality Don Gabrielson, Director, Pinal County AirPollution Control District

2Enclosure

2012 Pb Design Values (DV5), ADEQ’s Globe Highway Monitor (AQS ID 04-007-1002) 3-month period 2012 DVs

Nov-Dec-ian 0.07 Dec-ian-Feb 0.14 ian-Feb-Mar 0.15 Feb-Mar-Apr 0.20 Mar-Apr-May 0.16 Apr-May-iun 0.20 May-Jun-iul 0.15 Jun-Jul-Aug 0.14 Jul-Aug-Sep 0.12 Aug-Sep-Oct 0.11 Sept-Oct-Nov 0.09 Oct-Nov-Dec 0.06 *O3ta pulled from AO.S on June 5, 2013 The lead NAAQS is violated when the design value (the three-month rolling average ofambient lead concentrations) exceeds 0.15 mg/rn 3

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