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MARICOPA

ASSOCIATION of

GOVERNMENTS 302 North 1st Avenue, Suite 300 A Phoenix, Arizona 85003

Phone (602) 254-6300 A FAX (602) 254-6490

E-mail: mag@azmag.gov A Web site: www.azmag.gov

June 27, 2014

Mr. Henry Darwin, Director JUN 2 7 2014

Arizona Department of Environmental Quality

I 10 West Washington Street

Phoenix, Arizona 85007 .

Dear Mr. Darwin:

As the designated Regional Air Quality Planning Agency, the Maricopa Association of Governments Regional

Council adopted the MAG 20 I 4 Eight-Hour Ozone Plan-Submittal of Marginal Area Requirements for the

Maricopa Nonattainment Area on June 25, 20 I 4. At this time, it is requested that the Arizona Department of

Environmental Quality officially submit the MAG 20 14 Eight-Hour Ozone Plan-Submittal of Marginal Area

Requirements forthe Maricopa NonattainmentAreato the Environmental Protection Agency (EPA) for approval.

The MAG 2014 Eight-Hour Ozone Plan-Submittal of Marginal Area Requirements for the Maricopa

Nonattainment Area has been prepared in accordance with Section I 82(a) of the Clean Air Act. On

May 2 I, 20 2, the Environmental Protection Agency designated the Maricopa nonattainment area as a Marginal

Areaforthe 2008 eight-hour ozone standard of 0.075 parts per million. The plan addresses the Marginal Area

requirements, such as an Emissions Statement, Baseline Emissions Inventory, Periodic Emissions Inventory,

Corrections to Pre-1990 ReasonablyAvailable Control Technology, New Source Review, Corrections to Pre

I 990 Previously Required Vehicle Inspection and Maintenance Programs, and Transportation Conformity.

As a Marginal Area, the Maricopa nonattainment area will have a December 3 I, 20 I 5 attainment date. EPA

assumes that Marginal Areas will be in attainment of the eight-hour ozone standard within three years of

designation without any additional control measures. According to the EPA proposed guidance (June 6, 2013),

Marginal Areas are not required to submit an attainment demonstration, reasonably available control

technologies and measures, reasonable further progress demonstration, and contingency measures.

In accordance with the Clean Air Act, a public hearing was conducted on the plan on May I 5, 2014. The public

hearing process documentation is contained in Appendix B, Exhibit I. Foryour convenience, three hard copies

of the MAG 20 I 4 Eight-Hour Ozone Plan-Submittal of Marginal Area Requirements for the Maricopa

Nonattainment Area and three CDs are provided. Each CD is an exact duplicate of the hard copy.

We are looking forward to working cooperatively with the Arizona Department of Environmental Quality in our

continuing efforts to improve air quality. If you have any questions, please do not hesitate to contact Lindy Bauer

or me at (602) 254-6300.

Executive Director

cc: Eric Massey, Arizona Department of Environmental Quality

Colleen McKaughan, Environmental Protection Agency

A Voluntary Association of Local Governments in the Maricopa Region

City of Apache Junction A Arizona Department of Transportation A City of Avondale A Town of Buckeye A Town of Carefree A Town of Cave Creek A City of Chandler A Citizeno Transportatio

City of El Mirage A Town of Florence Fort McDowell Yavapai Nation A Town of Fountain Hills A Town of Gila Bend A Gila River Indian Community A Town of Gilbert A City of Glendale City of Good

Town of Guadalupe A City of Litchfield Park City of Maricopa A Maricopa County A City of Mesa A Town of Paradioe Valley i City of Peoria City of Phoenix A Pinal County Town of Queen Cree

Salt River Pima-Maricopa Indian Community A City of Scottsdale A City of Surprise A City of Tempe A City of Talleson A Town of Wickenbucg A Town of Yaungtown