Penn~ylvani':. Department of Environ~ental Pro~ection 

Rachel Carson State Office Building 

Secretary 

Mr. Shawn M. Garvin 

Regional Administrator 

P.O. Box 2063 

Harrisburg, P A 17105-2063 

May 24, 2011 

U.S. Environmental Protection Agency, Region III 

1650 Arch Street (Mail Code: 3RAOO) 

Philadelphia, PA 19103-2029 

Dear Mr. Garvin: 

717-787-2814 

On April 26, 2010, the Department of Environmental Protection (DEP) submitted the 

Commonwealth of Pennsylvania's "infrastructure" state implementation plan (SIP) revision to 

the U.S. Environmental Protection Agency (EPA) to address the requirements of section 

110(a)(2) of the Cleau Air Act (CAA) for the 2006 24-hour National Ambient Air Quality 

Standard for fine particulate matter (PM2S)' The purpose of this letter is to clarify the 

infrastructure SIP revision submittal related to the elements of section 110(a)(2)(D)(i)(II) and 

section 11O(a)(2)(D)(ii) of the CAA. 

Section 110(a)(2)(D)(i)(II) of the CAA requires that a state's SIP have adequate 

provisions to prohibit any source or emissions activity from emitting air pollutauts in amounts 

that would interfere with measures in other states to prevent significaut deterioration of air 

quality or visibility. The Commonwealth of Pennsylvauia's approved SIP meets the 

infrastructure element for prevention of significant deterioration (PSD) requirements for the. 

24-hour PM2.S staudard. The federal PSD provisions are adopted aud incorporated by reference 

in their entirety in Pennsylvania's PSD regulations codified at 25 Pa. Code § 127.83 (relating to 

adoption of program). These provisions were approved by EPA on August 21, 1984, and 

subsequently codified in the SIP at 40 CFR § 52.2058 (relating to prevention of significant air 

quality deterioration). 49 FR 33128. 

In regard to the visibility element for the infrastructure SIP revision, on 

December 20,2010, DEP submitted a Regional Haze SIP revision to EPA pursuant to sections 

169A aud 169B of the CAA aud 40 CFR Part 51 Subpart P (relating to protection of visibility). 

The December 2010 Regional Haze SIP submittal also serves the purpose of meeting 

Pennsylvauia's relevaut and applicable requirements nnder section 110(a)(2) of the CAA, 

including section 110(a)(2)(D)(i)(II). This approach is consistent with the guidauce provided in 

the EPA memoraudnm from William T. Harnett, Director, Air Quality Policy Division, Office of 

Air Quality Planning aud Staudards, entitled "Guidauce on SIP Elements Under Sections 

110(a)(I) aud (2) for the 2006 24-Hour Fine Particle (PM2S) National Ambient Air Quality 

Staudards (NAAQS)," dated September 25,2009. 

An Equal Opportunity Employer www.dep.state.pa.us Printed on Recycled Paper @ 
Mr. Shawn M. Garvin 2 May 24, 2011 

Section 110(a)(2)(D)(ii) requires that states ensure compliance with the applicable 

requirements of sections 126 and 115 (relating to interstate and international pollution 

abatement). DEP has demonstrated that the Commonwealth has met its obligations pursuant to 

section 126 of the CAA and it currently has no pending obligations pursuant to CAA section 

126(b). Any subsequent findings issued by EPA under section 126 would be addressed in the 

SIP codified at 40 CFR Part 52, Subpart NN (relating to Pennsylvania). DEP has made the 

necessary submittals to demonstrate that Pennsylvania has adequate provisions insuring future 

compliance with the requirements of sections 126 and 115 of the CAA, as may be necessary. 

Should you have any questions or need additional information regarding this clarification 

of the Commonwealth's infrastructure SIP revision for the 24-hour PM2.S standard, please 

contact Joyce E. Epps, Director, Bureau of Air Quality, bye-mail atjeepps@state.pa.us or by 

telephone at 717-787-9702. 

'V"'v''''''' 1. Krancer 

Secretary