Mr. Shawn M. GarvinRegional Administrator

U.S. Environmental Protection Agency, Region III RECEIVED

1650 Arch Street (Mail Code: 3RAOO)

Philadelphia, PA 19103-2029

Division Director (3APOO)

Dear Mr. Garvin:

In April 2005, the U.S. Environmental Protection Agency (EPA) designated the

Liberty-Clairton PM25 Area, which includes the City of Clairton and the boroughs of Glassport,Liberty, Lincoln, and Port Vue, as a separate “partial county” (Allegheny) fine particulate matter(PM25)nonattainment area (Liberty-Clairton PM2.5Area) for the 1997 PM2.5national ambient airquality standard (NAAQS) because of the localized impact of certain sources in the area. The

Department of Environmental Protection (DEP) is hereby withdrawing the June 25,2010, StateImplementation Plan (SIP) revision pertaining to the attainment demonstration and base-yearinventory for the Liberty-Clairton PM2.5Area and submitting a new attainment demonstrationand base-year inventory for the area for approval as a revision to Allegheny County’s portion of

the SIP, under Section 172 of the Clean Air Act (CAA), 42 U.S.C. § 7502. The June 2011 SIP

revision should continue to be identified as revision 67 for the Allegheny County HealthDepartment’s (ACHD) internal tracking system.

I have enclosed a hard copy and compact disk ofthe replacement SIP submittal for the

Liberty-Clairton PM2.5Area, which consists of the following documents: (1) an attainmentdemonstration and base-year inventory, an analysis of reasonable further progress, analysis of

reasonably available control measures, a mobile source emission budget for purposes oftransportation conformity, and a description of contingency measures that will be implemented

to bring the area back into attainment should violations of the 1997 PM2.5NAAQS occur afterthe standard is attained; (2) certification of public participation activities and proof of publication

of public hearing notices; (3) technical appendices (appendices consisting of data files are

provided in electronic form only); and (4) the comment and response document. I certify that the

electronic files are exact duplicates of the hard copies.

The ACHD opened the public comment period for this Liberty-Clairton PM2.5 SIP

revision on November 15, 2010; a public hearing was held on December 16, 2010, and the

comment period closed on December 16, 2010. The County Board of Health approved theenclosed SIP revision at their meeting on March 10, 2011.

An Equal Opportunity Employer www.dep.state.pa.us Printed on Recycled Paper
proposed controls.

The attainment demonstration modeling utilizes the CALPUFF model in a near-field

application. The reasons for the use ofthis model, modeling protocol, and modeling results areincluded in the SIP revision and were subject to public comment.

DEP is also submitting this document to satisfy the requirements of 40 CFR Part 51.1011

for a mid-course review.

DEP is also submitting this document to satisfy the mid-course review requirements of

40 CFR § 51.1011 (relating to requirements for mid-course review).

As you know, ACHD is a local health agency organized under the Local Health

Administration Law, Act 315 of August 24, 1951, P.L. 1304, as amended, whose powers and

duties include the enforcement of laws relating to public health within Allegheny County. The

county administers a local air pollution control program approved by DEP in accordance with

Section 12 ofthe Air Pollution Control Act. 35 P.S. § 4012.

We look forward to working with EPA to obtain approval of the SIP revision for the

Liberty-Clairton PM2.5Area. Should you have any questions or need additional information,

please contact Joyce E. Epps, Director, Bureau of Air Quality, by e-mail at jeepps@state.pa.us or

by telephone at 717-787-9702. You may also contact James E. Thompson, Manager, ACHD AirQuality Program, by e-mail atjthompson@achd.net or by telephone at 412-578-7961

Michael L. Krancer

Secretary

Enclosures