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### ee Freeman
April 13,201 1 Gwen Keyes Fleming Regional Administrator USEPA Region 4 Atlanta Federal Center 61 Forsyth Street, SW Atlanta, GA 30303-8960
Dear Ms. Fleming:
I ampleased to submit the Section 1lO(a)(l) Maintenance Plan for the 1997 8-Hour Ozone Standard for GreensboroNinston-SalemiHigh Point 1-Hour Ozone Maintenance Area. Enclosed is one hard copy of the complete package containing the Section 1lO(a)(l) maintenance plan, as well as the supportingdocumentation as to 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 opportunity to request apublic hearing, in accordance with 40 CFR 

### 51.102,and the public comment period were noticed in the local newspapers on Wednesday March 2, 201 1. The public commentperiod was open from Wednesday, March 2,2011through Friday, April 1,2011. There were no written requests for apublic hearing and the only comments received were fromthe USEPA.
In addition to addressing the USEPA's comments on the pre-hearing draft submittal, a few additional changes were made in the final submittal. First an error was found in the point source documentation. Somefacility emissions were reported in pounds per year and had not been properly converted to tons in the pre-hearing draft. Additionally, other essors were discovered in converting the annual emissions to typical ozone season weekday emissions. These errors have been corrected in the final submittal. The on-road mobile source emissions were revised to reflect the revised MOVES2010a mobile model. The emission changes between MOVES2010 and MOVES2010awere very minor. The area source emissions inventory was revised for the open burning of municipal waste and small stationary combustion sources. In the pre-hearing draft the open burning of m~~nicipal waste emissions were not adjusted to account for the NCDAQ's Open Burning rule 15ANCAC 2D .1900. The emissions have been adjusted similarly to how the emissions for this source category were adjusted in the fine particulate matter redesignation demonstration and maintenance plan submitted in December 2009. For the small stationary combustion sources, the methodology was revised to reflect the current USEPA methodology.

1641 Mail ServiceCenter, Raleigh, North Carolina 27699-1641 2728 Capital Blvd., Raleigh, NC27604 Phone: 919-733-3340I FAX 919-71 5-71 75 1Internet: www.ncair.org An Equal OpportunityIAffirmativeAction EmployerMs. Fleming April 13,20 1 1 Page 2 Although the emission estimates presented in the pre-hearing draft have changed significantlyin this final submittal, the overall message of the Triad I lO(a)(l) maintenance plan has not changed; the emissions in the future years are lower than thebase year and continued maintenance is demonstrated. I respectfully request that you commence the federal approval process for the Section 1lO(a)(l) Maintenance Plan for the 1997 8-Hour Ozone Standard forCreensboroNiiinstonSalemJHigh Point 1-HourOzone Maintenance Area. If you should have any questions, please contactLaura Boothe of my staff at (919) 733-1488 or laura.boothe@ncdenr.gov.

la C. Holman

Attachment

cc: Michael Abraczinskas Laura Boothe Dick Schutt Lynorae Benjamin