Beverly Eaves Perdue 

Governor 

Gwendolyn Keyes Fleming 

Regional Administrator 

USEPA, Region 4 

Sam Nunn Federal Center 

61 Forsyth Street, SW 

Atlanta, Georgia 30303-8960 

Dear Ms. Fleming: 

Director 

August 2, 2012 

Dee Freeman 

Secretary 

I am pleased to submit the Carbon Monoxide (CO) Limited Maintenance Plan for the 

Charlotte, Raleigh/Durham and Winston-Salem CO maintenance areas. The North Carolina 

Division of Air Quality (NCDAQ) relied on the United States Environmental Protection Agency's 

(USEPA's) October 6, 1995 memorandum, "Limited Maintenance Plan Option for Nonclassifiable 

CO Nonattainment Areas" to develop this CO Limited Maintenance Plan. Enclosed is one hard 

copy of the complete package containing the limited maintenance plan, the supporting 

documentation on how the emission estimates were developed and an exact duplicate electronic 

copy on compact disk. Additionally, the disk includes the MOVES model input and output files. 

The NCDAQ is exercising the limited maintenance plan option since the CO maintenance 

areas are well below the CO National Ambient Air Quality Standard (NAAQS). In a limited 

maintenance plan, maintenance is demonstrated when the monitoring data for the CO maintenance 

areas are meeting the air quality criteria, which is 85% of the CO NAAQS. The CO Limited 

Maintenance Plan submittal contains the other elements necessary for a limited maintenance plan 

including an emissions inventory for a typical winter day for the 2010 attainment year, a 

commitment to continue operation of the air monitoring network to verify the attainment status 

over the attainment period and contingency measures to ensure prompt action is taken to correct 

any violation of the CO NAAQS. Thus, the CO limited maintenance plan fulfills the requirements 

of Section 175A of the Clean Air Act as amended. 

The NCDAQ issued a public notice announcement on June 29, 2012 indicating that the CO 

Limited Maintenance Plan documentation was available for public comment and posted on the 

NCDAQ website for review. The public notice announcement was sent to a number of distribution 

lists managed by the NCDAQ. These distribution lists included numerous stakeholders from 

industry, environmental groups, and transportation partners. The NCDAQ believed that sending 

the public notice announcement to these groups was more effective than publishing the notices in a 

few local newspapers and is consistent with the requirements described in the April6, 2011 , 

memorandum, "Regional Consistency for the Administrative Requirements of State 

Implementation Plan Submittals and the Use of Letter Notices." Additionally, the NCDAQ 

1641 Mail Service Center, Raleigh, North Carolina 27699-1641 

217 West Jones Street, Raleigh, NC 27603 

Phone: 919-707-8401 I FAX 919-715-0718 I Internet: www.ncair.org 

An Equal Opportunity/Affirmative Action Employer 

N~rth Carolina 

)Vaturalllf 
Ms. Fleming 

August 2, 2012 

Page2 

website has Rich Site Summary (RSS) feed which regularly delivers changes to the website 

content to those that have signed up for it. 

The public notice announcement also indicated that the public may request a public 

hearing. The NCDAQ did not receive any public comments or requests for a public hearing. The 

comment period opened on June 29, 2012 and closed on July 31, 2012. 

If you have any questions regarding this submittal, please contact Laura Boothe of my staff 

at (919) 707-8721 or laura.boothe@ndenr.gov. 

SCH:pdj 

Attachment 

cc Sushma Masemore, NCDAQ 

Scott R. Davis, USEP A 

Lynorae Benjamin, USEPA 

Sincerely, 

f~Vl,~_Q_ 0: ~ ..9r Sheila C. Holman 

William Barnette, Forsyth County Office of Environmental Assistance and Protection 

Donald Willard, Mecklenburg County Air Quality