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EPA/AR RIN: 2060-AQ58 Publication ID: Fall 2011 
Title: Reconsideration of Final National Emission Standards for Hazardous Air Pollutants for Reciprocating Internal Combustion Engines 
Abstract: On March 3, 2010, EPA issued a final rule establishing standards for emissions of hazardous air pollutants (HAP) from existing stationary diesel engines located at major and area sources. The final rule revised the requirements for emergency stationary engines to allow operation for up to 15 hours per year in emergency demand response, if needed to maintain stability in the grid, as determined by the regional transmission organization. EPA has received two petitions to reconsider this decision to allow 15 hours of operation for emergency demand response for emergency stationary engines. On December 7, 2010, EPA issued a Federal Register notice announcing our decision to grant reconsideration and soliciting information and public comments on the emergency demand response issue. This proposal will amend the final rule to address the issues raised in the petitions for reconsideration. EPA also received a petition to reconsider the standards for emissions of HAP from existing stationary spark ignition engines located at major and area sources, which were finalized on August 20, 2010. In response to the petition, EPA is reconsidering the use of formaldehyde as a surrogate for HAP for four-stroke rich burn engines. This action will propose amendments to the final rule to address the issue raised in the petition. 
Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: Undetermined  Unfunded Mandates: Undetermined 
CFR Citation: 40 CFR 63   
Legal Authority: 42 USC 7412(d)   
Legal Deadline:  None
Timetable:
Action Date FR Cite
Notice of Reconsideration  12/07/2010  75 FR 75937   
Notice of Public Meeting  12/23/2010  75 FR 80761   
NPRM  12/00/2011    
Additional Information: EPA publication information: Notice of Reconsideration - http://www.regulations.gov/#!documentDetail;D=EPA-HQ-OAR-2008-0708-0642; Split from RIN 2060-AP36. Judicial comments: Consent decree for NESHAP for non-emergency stationary diesel engines 300 HP or greater; EPA Docket information: EPA-HQ-OAR-2008-0708
Regulatory Flexibility Analysis Required: Undetermined  Government Levels Affected: Undetermined 
Small Entities Affected: No  Federalism: Undetermined 
Included in the Regulatory Plan: No 
RIN Information URL: http://www.epa.gov/ttn/atw/rice/ricepg.html  
RIN Data Printed in the FR: No 
Agency Contact:
Melanie King
Environmental Protection Agency
Air and Radiation
109 T.W. Alexander Drive, Mail Code D243-01,
Research Triangle Park, NC 27711
Phone:919 541-2469
Email: king.melanie@epa.gov

Robert Wayland
Environmental Protection Agency
Air and Radiation
D243-01,
Research Triangle Park, NC 27711
Phone:919 541-1045
Fax:919 541-5450
Email: Wayland.RobertJ@epamail.epa.gov