UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION IX 75 Hawthorne Street San Francisco, CA 94105-3901

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, 2010, and April 

### 5, 2010, 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 60NSPS 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 WWW 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,

Deborah Jordan

# p

Director, Air ~ivi&on

cc: Jo Crumbaker, Maricopa County AQD