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# F NEVAD A jim Gibbons,Governor De~artment of Conservation & Natural Resources Allen Bia~gi, Director

--- DIVISION OF ENVIRONMENTAL PROTECTION Leo M.Drozdofi P.E., Administrotor protecting the future for generations September 1, 20 10 Jared Blumenfeld, Regional Administrator OAR-],USEPA Region IX 75 Hawthorne Street SanFrancisco, CA 94105 Dear Mr. Blumenfeld: Onbehalf of Governor Gibbons, as his appointed designee, this letter transmits to you two hard copies of Clark County's revisions to their major sourcepermitting program regulations and five compact discs. Additionally, the regulations may be viewed on Clark County's website at http:.~lwww.accessclar~unty.coddepts~es/work index.aspx. The Nevada Division of Environmental Protection (NDEP) requests approval ofthe enclosed revisions to Clark County's Air Quality Regulations (AQR) into the Nevada StateImplementation Plan (SIP). 'The enclosed package includes revisions to Sections 0 and 25 of the Clark County AQR, new Sections 12.2, 12.3 and 12.4, and the repeal of existing Section 16. Sections 0 and 25 are currently part ofthe SIP; the enclosed revisions are intended to replace the existing sections. New Sections 12.2, 12.3 and 12.4 replace the major source provisions of existing AQR Section 

### 12.Please refer to the enclosed letter from the Clark County Department ofAir Quality and Environmental Management (DAQEM) to the NDEP for more detail regarding the SIP changes. 'The regulations were adopted 

### by the Clark County Board of County Commissioners on May 18, 2010. Evidence of adoption, appropriate public notice and the participation process is included in this package, as well as a tabulation of public comments and Clark County's response. If you should have any questions about this submittal or require additional clarification, you may contact Russell Roberts ofthe Clark County DAQEM at (702) 455- 1611. Sincerely,

Colleen Cripps, Ph.D. Acting Administrator Enclosures cc wio enclosures: Robin Reedy, Chief of Staff, Office of the Governor Leo Drozdoff, Acting Director, DCNR Greg Remer, Chief. Bureau of Air Quality Planning, NDEP Tina Gingras, Assistant Director, Clark County DAQEM Russell Roberts, Rules Project, Clark County DAQEM Jefferson Wehling. Air Attorneys (ORC-2). EPA Region 1X Gerardo Rios. Permits Office (AIR-3), Air Division, EPA Region IX Certified Mail No. 7009 34 100000 1454 1395
901 S.Stewart Street,Suite 400 1 Carson City,Nevada 89701 p: 775.687.4670 f: 775.687.5856 www.ndep.nv.gov &A prmred on recycled poperDEPARTMENT OFAIR QUALITY & ENVIRONMENTAL MANAGEMENT 500 S Grand Central Parkway 1 st Floor

. Box 555210

. Las Vegas, NV 891 55-52 10 (702) 455-5942

. FOX(702) 383-9994 Lewis Wallenmeyer Director . Tina Gingras Assislonf Director Nevada Environmental Protection 

### August 24,2010 

## AUG 

## 3 1 

## 2010 Ms. Colleen Cripps, Acting Administrator Nevada Division ofEnvironmental Protection 901 South Stewart Street, Suite 400 1 Carson City, Nevada 89701-5249 Re: Revision to Clark County Air Quality Regulation Sections 

### 0 and 25 and Adoption ofNew Air Quality Regulation Sections 12.2,12.3and 12.4

### - Revision to the State Implementation Plan 

### Dear Ms. Cripps: On May 18, 2010, the Clark County Board of County Commissioners adopted revisions to Sections 0 and 25 of the Clark County Air Quality Regulations (AQRs) and also adopted new Sections 12.2, 12.3 and 12.4. Sections 0 and 25 are currently part of the Clark County portion of the Nevada State Implementation Plan (SIP), which the revised rules are intended to replace. Sections 12.2, 12.3and 12.4 are proposed for incorporation into the SIP, replacing the major source provisions of existing AQR Section 12. As you know, revising and adopting these regulations constitutes a revision of the SIP and accordingly, these actions were conducted consistent with the requirements of 40 CFR Part 51, $51.102 and Appendix V ofPart 51. The Board's action consisted ofthe following: Adoption of a revision to Section 0: Definitions 

### (Only two terms, "permanent" and "surplus" were revised) Adoption of a revision to Section 25: Affirmative Defense for Excess Emissions Due to Malfunctions, Startup and Shutdown 

### Adoption of a new AQR Section 12.2:Permit Requirements for Major Sources in Attainment Areas 

### Adoption of a new AQR Section 12.3: Permit Requirements for Major Sources in Nonattainment Areas 

### Adoption of new AQR Section 12.4:Authority to Construct Application and Permit Requirements for Part 70 

### Sources 

### Repeal of existing Section 16:Operating Permits

BOARD OF COUNTY COMMISSIONERS Rory Reid Choirrnon

. Susan Broger Vice-Choirmon Larry Brown, Tom Collins, Chris Giunchigliani, Sfeve Sisolak, Lawrence Weekly Virginia Valentine, PE, County Monoger