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 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
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REGION 8
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1595 Wynkoop Street
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Denver, CO   80202-1129
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Phone 800-227-8917
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www.epa.gov/region8


Ref: 8ARD

Garry Kaufman, Division Director
Air Pollution Control Division
Colorado Department of Public Health and Environment
4300 Cherry Creek Drive South
Denver, Colorado 80246-1530

Dear Mr. Kaufman:

On March 22, 2021, the Environmental Protection Agency received Colorado's State Implementation Plan submission to address Clean Air Act Section 182(c) requirements for the Denver Metro/North Front Range Serious nonattainment area under the 2008 Ozone National Ambient Air Quality Standards. We have reviewed the submittal and have determined that it fulfills the completeness criteria in 40 CFR Part 51, Appendix V. We are now reviewing the state's submission to prepare a Notice of Proposed Rulemaking, which will evaluate whether the submission can be approved. 

If you have any questions regarding our completeness review, please call me at (303) 312-6416 or have your staff contact Abby Fulton at (303) 312-6563 or fulton.abby@epa.gov.

								Sincerely,
																	Carl Daly
								Acting Director
								Air and Radiation Division
								
