G O VE RNM ENT OF T H E DISTRI CT O F COLUMBIA Dis trict Department of th e Environment

June 19, 2015 Shawn M. Garvin Regional Administrato r U.S. Environmental Protection Agency Region Ill (Mail Code: 3

### RAOO) 1650 Arch Street Philadelphia, PA 19103-2029 

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Subject: District of Columbia Rulemaking to Regulate the Interstate Transport of Nitrogen Oxides (NOx) Emissions from Non-Electric Generating Unit Sou rces and Revision of the D istrict's State Implementation Plan (SIP) Dear Mr. Garvin: Pursuant to the authority set forth in sections 5 and 6(b) of the District of Columbia Air Pollution Control Act of 1984 , effective March 15, 1985 , as amended (D.C. Law 5-165; D.C. Official Code§§ 8-101.05 and 8-101.06(b) (2013 Repl.)); section 107(4) ofthe District D epartment of the Environment Establishment Act of2005, effective February 15 , 2006 (D.C. Law 16-51; D.C. Official Code§§ 8-15 1 .07(4) and 8-151.10 (20 13 Repl.)); and Mayor 's Order 2006-61, dated June 14, 2006, the District of Columbia (District) is hereby requesting approval of a revision to its State imp lementation Plan (SIP) submitted in accordance with the requirements of 40 C

.F.R. Part 51. The District is requesting approval of this SIP revision to meet certain federal Clean Air Act requirements under section 1 10(a)(2)(D)(i)(I). The S IP revision is a final rulemaking action t o regulate the interstate transport of emission s of nitrogen oxide (NOx) from non-electric generat ing unit (EGU) sources by amendin g Chapters 1 and I 0 ofTitle 20 (Environment) of the Di strict of Co lumb ia Municipa l Regulatio ns (DCMR). States with non-EGUs that participated in emissions trading under the NOx SI P Call or the Clean Air Interstate Rule are required to take regulatory act ion to continue to meet NOx SIP Call nonEGU emissions reduction obligations adopted in their SIPs. 40 C.F.R. 

### § 51.121. The rulemaking action addresses th is requirement by placing an emissions cap on applicable units at the D istrict 's one non-EGU during the ozone season. The proposed regulation was first published in the D.C. Register on July 22, 2011 (58 OCR 29; notice lD 12934 1 5 ). A second proposed rulemaking was publi shed in the D. 

### C. Reg ist er on November 2 1,20 14 (61 OCR 012013; notice ID 5191069 ). The rule s became effective on March 8, 2015, the date of pub lication ofthe Notice of Final Rulemaking in the D. 

### C. Regist e r (62 OC R 005685 ; notice ID 5452775 ). 

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OFT HI: ENVIRONMI:NT 1200 First St. NE, 5th Floor, Washington, DC 20002ltel: 202.535.2600 

### I web: ddoe.dc.govThe following are included with this S I P submittal package:

• One paper copy of the Notice of Final Rulemaking (which includes DDOE's response to public comments); • Public hearing notice; • Hearing officer's certification; • One paper copy of comments submitted during public comment period; • One disk containing an electronic version ofthe SIP revision. The electronic version includes an exact duplicate of the paper copy of the SIP revision submittal. Should you have any questions or require additional information, please contact me at (202) 535- 2615 , or Ms. Cecily Beall , Associate Director for the Air Quality Division , at (202) 535-2626. Sincerely,**Dire ~** 

# Encl**re** cc: Diana Esher, Director, Air Protection Division, EPA Region 3 Cecily Beall , Associate Director, Air Quality Division , DDOE

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