December 01, 2010

National Emission Standards for Hazardous Air Pollutants for Reciprocating Internal Combustion Engines

AGENCY: Environmental Protection Agency (EPA).

ACTION: Notice of reconsideration of final rule; request for public comment; notice of public meeting.

SUMMARY: On March 3, 2010, EPA published final national emission standards for hazardous air pollutants for existing compression ignition stationary reciprocating internal combustion engines. Subsequently, the Administrator received two petitions for reconsideration concerning one particular issue arising from the final rule. EPA is announcing our reconsideration of and requesting public comment on that one issue. Specifically, while EPA is not proposing at this time any specific changes to our regulations, EPA is requesting Page 2 of 22

This document is a prepublication version, signed by EPA Administrator, Lisa P. Jackson on 12/01/2010.

We have taken steps to ensure the accuracy of this version, but it is not the official version. comment on our decision to amend the limitations on operation of emergency stationary engines to allow emergency engines to operate for up to 15 hours per year as part of an emergency demand response program. EPA plans to issue a final decision on this issue as expeditiously as possible. EPA is seeking comment only on this issue. EPA will not respond to any comments addressing any other issue or any other provisions of the final rule or any other rule.

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