UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION IX 

75 Hawthorne Street 

San Francisco, CA 941 05-3901 

May 6, 2010 

Max Porter, Interim Director 

Maricopa County Air Quality Department 

1 00 1 North Central Avenue, Suite 900 

Phoenix, Arizona 85004 

Dear Mr. Porter: 

We received the Maricopa County Air Quality Department's March 5, 201 0, and 

April 5, 201 0, requests for delegation of Standards of Performance for New Stationary 

Sources (NSPS) and National Emission Standards for Hazardous Air Pollutants (NESHAP) 

pursuant to the Code of Federal Regulations, Title 40 (40 CFR), Parts 60, 61, and 63. In this 

letter, we are responding only to your requests for delegation of 40 CFR Part 63 NESHAP. 

You will receive a separate letter addressing delegation of 40 CFR Part 60 NSPS and Part 61 

NESHAP. 

In response to your requests, the U.S. Environmental Protection Agency, Region IX, 

(EPA) hereby grants to the Maricopa County Air Quality Department formal delegation of 

the following 40 CFR Part 63 NESHAP, as they existed on July 1,2008: 

Subpart W WW WW - National Emission Standards for Hospital Ethylene Oxide Sterilizers 

Subpart YYYYY - NESHAP for Area Sources: Electric Arc Furnace Steelmaking Facilities 

Subpart ZZZZZ - NESHAP for Iron and Steel Foundries Area Sources 

Subpart BBBBBB - NESHAP for Source Category: Gasoline Distribution Bulk Terminals, 

Bulk Plants, and Pipeline Facilities 

Subpart CCCCCC - NESHAP for Source Category: Gasoline Dispensing Facilities 

Subpart DDDDDD - NESHAP for Polyvinyl Chloride and Copolymers Production Area 

Sources 

Subpart EEEEEE - NESHAP for Primary Copper Smelting Area Sources 

Subpart FFFFFF - NESHAP for Secondary Copper Smelting Area Sources 

Subpart GGGGGG - NESHAP for Primary Nonferrous Metals Area Sources - Zinc, 

Cadmium, and Beryllium 

Subpart HHHHHH - NESHAP: Paint Stripping and Miscellaneous Surface Coating 

Operations at Area Sources 

Subpart LLLLLL - NESHAP for Acrylic and Modacrylic Fibers Production Area Sources 

Subpart MMMMMM - NESHAP for Carbon Black Production Area Sources 

Subpart NhNNNN - NESHAP for Chemical Manufacturing Area Sources: Chromium 

Compounds 

Subpart 000000 - NESHAP for Flexible Polyurethane Foam Production and Fabrication 

Area Sources 

Subpart PPPPPP - NESHAP for Lead Acid Battery Manufacturing Area Sources 

Subpart QQQQQQ - NESHAP for Wood Preserving Area Sources 

Prznted on Recycled Paper 

- 
Subpart RRRRRR - lVESHAP for Clay Ceramics Manufacturing Area Sources 

Subpart SSSSSS - NESHAP Glass Manufacturing Area Sources 

Subpart TTTTTT - NESHAP for Secondary Nonferrous Metals Processing Area Sources 

Regarding any other 40 CFR Part 63 NESHAP previously delegated to Maricopa 

County, this letter is also delegating any amendments made to those NESHAP as of July 1, 

2008. These NESHAP are being delegated in accordance with the November 1, 1999, 

Memorandum of Agreement (MOA) between Maricopa County and EPA regarding the 

delegation of NESHAP. As set forth in the MOA, these delegations are effective upon the 

date of this letter and EPA will publish a future Federal Register notice to codify these 

delegations into the Code of Federal Regulations. 

We appreciate the Maricopa County Air Quality Department's efforts to implement 

the federal air toxics program and hope to continue working with you to reduce emissions of 

air toxics in Maricopa County. If you have any questions about this delegation, please call 

me at (41 5) 947-871 5 or have your staff contact Mae Wang at (41 5) 947-4124. 

Sincerely, 

Director, 

Deborah Jordan 

Air ~ivi&on 

p 

cc: Jo Crumbaker, Maricopa County AQD