MAR 12 2Oi

Mr. Shawn M. Garvin

Regional Administrator (3RA00)U.S. Environmental Protection AgencyRegion Ill

1650 Arch Street

Philadelphia PA 19103-2023

Dear Mr. Garvin:

Sincer ly,

Shari T. Wilson

Secretary

Maryland Department of Environment

Attachment

MA 1 2010

EPA, EtiftJN Ill

‘thrn!—H-i;I .

RECP,1Er)

MAR 182010

3AP30

www.mde.state.md.us

Pursuant to section 181 (a)(5) of the Clean Air Act this is a request for a 1-year attainment date

extension to June 15, 2011 for the Cecil County nonattainment area which is classified as

moderate for the 1997 8-hour ozone national ambient air quality standard (NAAQS or standard).

By this letter, I am certifying that:

1) The State of Maryland has complied with all requirements and commitments pertaining

to the area in the applicable ozone implementation plan; and

2) The Cecil County nonattainment area’s 4th highest daily 8-hour monitored value during

the 2009 ozone season is 0.084 ppm or less. Attached is the letter certifying that our

ozone air quality data in the Air Quality System is complete, quality-assured ambient air

quality monitoring data for the 2009 attainment year ozone season.

Maryland would appreciate your taking action on this request as soon as possible. If you wouldlike to discuss this further please call me at 410-537-3084.

RECEIVED

MAR 182010

ujiecior (3APOO)

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January 27, 2010

Mr. Shawn M. Garvin, Regional Administrator

U.S. Environmental Protection AgencyRegion Ill-Middle Atlantic Region(3RAOO)

1650 Arch Street

Philadelphia, PA 19103-2029

Dear Mr. Garvin:

The Maryland Department of the Environment’s 2009 Ozone ambient concentration data, along with the

quality assurance data is completely submitted to the National Air Quality database, AQS. The data was reviewed and

certified as correct to the best of their knowledge taking into consideration the quality assurance findings by the

Ambient Air Monitoring Program, Air and Radiation Management Administration.

The AMP45O report is included with this letter. The 2009 Ozone sites are listed in the AMP45O (report ID: 710026).The AMP255 (report ID: 710307) is also included with this letter. This report contains the precision and accuracysummaries for the 2009 Ozone data.

As the senior air pollution official for the State of Maryland, I agree with the Ambient Air Monitoring

Program’s assessment ofthe 2009 Ozone data. I request that the data be included as early certified official data forMaryland in the National Air Quality database. MDE is submitting this data for early certification so that it can be

reviewed by EPA for the Baltimore Metro and Cecil County 8-hour Ozone 1-year attainment date extension process.Once Region 3’s review of the certification package is complete please forward it to Mr. David Lutz, DataCertification Contact, US EPA (D243-02), U.S. Environmental Protection Agency, Research Triangle Park, NC 27711for insertion into the AQS database as certified 2009 Maryland Ozone data.

SincereJy,

Geofe (Tad) Aburn, Director

Air and Radiation Management Administration

TAD/EG

cc: Walter Wilkie, EPA, Region III

Edwin Gluth

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