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EPA/AR RIN: 2060-AL75 Publication ID: Fall 2008 
Title: Prevention of Significant Deterioration (PSD) and Nonattainment New Source Review (NSR): Debottlenecking, Aggregation, and Project Netting 
Abstract: This project will revise rules governing the major new source review (NSR) programs mandated by parts C and D of title I of the Clean Air Act (CAA). The new regulations will clarify and codify our policy of when multiple activities at a single major stationary source must be considered together for the purposes of determining major NSR applicability ("aggregation"). Also, we are changing the way emissions from permitted emissions units upstream or downstream from those undergoing a physical change or change in the method of operation are considered when determining if a proposed project will result in a significant emissions increase ("debottlenecking"). Finally, we are clarifying how emissions decreases from a project may be included in the calculation to determine if a significant emissions increase will result from a project ("project netting"). When final, these rules will improve implementation of the program by articulating and codifying principles for determining major NSR applicability that we currently address through guidance only. These rule changes reflect the EPA's consideration of the EPA’s 2002 Report to the President and its associated recommendations as well as discussions with various stakeholders including representatives of environmental groups, State and local governments, and industry. 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 51.165 and 51.166    40 CFR 52.21   
Legal Authority: 42 USC 7401 et seq   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  09/14/2006  71 FR 54235   
Final Action  12/00/2008    
Additional Information: SAN No. 4793; EPA publication information: NPRM - http://www.epa.gov/fedrgstr/EPA-AIR/2006/September/Day-14/a15248.htm; EPA Docket information: EPA-HQ-OAR-2003-0064
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal, Local, State 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Chuck Buckler
Environmental Protection Agency
Air and Radiation
C504-03,
Research Triangle Park, NC 27711
Phone:919 541-0873
Fax:919 541-5509
Email: buckler.charles@epa.gov

Lisa Sutton
Environmental Protection Agency
Air and Radiation
C504-03,
Research Triangle Park, NC 27711
Phone:919 541-4991
Fax:919 541-5315
Email: sutton.lisa@epa.gov