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EPA/OAR RIN: 2060-AP80 Publication ID: Spring 2018 
Title: Reconsideration of the Prevention of Significant Deterioration and Nonattainment New Source Review (NSR) Project Aggregation 

Under the New Source Review (NSR) preconstruction permitting program, stationary sources undergoing modifications need to determine whether their physical or operational changes are a "major modification" based on the emissions increase that would result from the change. The term "project aggregation" refers to the grouping of multiple, related physical or operational changes at a facility into a single project, such that their emission increases or decreases would be combined for purposes of determining NSR applicability. In January 2009, the EPA issued an interpretive rule that required changes to be aggregated into a single project if they are "substantially related" and created a presumption against aggregating projects that occur 3 or more years apart. This 2009 rule is currently stayed and under reconsideration by EPA. This action will finalize the reconsideration proceeding of the rule.

Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
EO 13771 Designation: Not subject to, not significant 
CFR Citation: 40 CFR 51.165    40 CFR 51.166    40 CFR 52.21   
Legal Authority: 42 U.S.C. 7401 et seq Clean Air Act   
Legal Deadline:  None
Action Date FR Cite
NPRM  04/15/2010  75 FR 19567   
NPRM Comment Period Extended  05/14/2010  75 FR 27191   
Final Rule  05/18/2010  75 FR 27643   
Final Rule  05/00/2018 
Additional Information: Docket #: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 Information URL:  
Sectors Affected: 211112 Natural Gas Liquid Extraction; 221111 Hydroelectric Power Generation; 221112 Fossil Fuel Electric Power Generation; 221113 Nuclear Electric Power Generation; 221119 Other Electric Power Generation; 221121 Electric Bulk Power Transmission and Control; 221122 Electric Power Distribution; 221210 Natural Gas Distribution; 322121 Paper (except Newsprint) Mills; 322122 Newsprint Mills; 324110 Petroleum Refineries; 325120 Industrial Gas Manufacturing; 325181 Alkalies and Chlorine Manufacturing; 325182 Carbon Black Manufacturing; 325188 All Other Basic Inorganic Chemical Manufacturing; 325411 Medicinal and Botanical Manufacturing; 325412 Pharmaceutical Preparation Manufacturing; 325413 In-Vitro Diagnostic Substance Manufacturing; 325414 Biological Product (except Diagnostic) Manufacturing; 325998 All Other Miscellaneous Chemical Product and Preparation Manufacturing; 331311 Alumina Refining; 336111 Automobile Manufacturing; 336112 Light Truck and Utility Vehicle Manufacturing; 336120 Heavy Duty Truck Manufacturing; 336211 Motor Vehicle Body Manufacturing; 336212 Truck Trailer Manufacturing; 336213 Motor Home Manufacturing; 336312 Gasoline Engine and Engine Parts Manufacturing; 336322 Other Motor Vehicle Electrical and Electronic Equipment Manufacturing; 336330 Motor Vehicle Steering and Suspension Components (except Spring) Manufacturing; 336340 Motor Vehicle Brake System Manufacturing; 336350 Motor Vehicle Transmission and Power Train Parts Manufacturing; 336399 All Other Motor Vehicle Parts Manufacturing; 336992 Military Armored Vehicle, Tank, and Tank Component Manufacturing; 486210 Pipeline Transportation of Natural Gas 
RIN Data Printed in the FR: No 
Agency Contact:
Dave Svendsgaard
Environmental Protection Agency
Office of Air and Radiation
Research Triangle Park, NC 27711
Phone:919 541-2380
Fax:919 541-5509

Raj Rao
Environmental Protection Agency
Office of Air and Radiation
Research Triangle Park, NC 27711
Phone:919 541-5344
Fax:919 541-5509