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EPA/AR RIN: 2060-AQ05 Publication ID: Spring 2010 
Title: ●Revisions to In-Use Testing for Heavy-Duty Diesel Engines and Vehicles; Emissions Measurement and Instrumentation; Not-To-Exceed Emission Standards; and Technical Amendments for Off-Highway Engines 
Abstract: This Direct Final Rule makes several revisions to EPA’s mobile source emission standards and test procedures. First, due to a delay in developing the final particulate matter (PM) accuracy margin for portable emission measurement systems, we are delaying the first year of the fully enforceable PM in-use testing program for the heavy-duty diesel vehicles from the 2009 calendar year to the 2010 calendar year. During the 2009 calendar year, there will be another year of pilot program testing for that pollutant. Second, we are allowing railroads to install a limited number of remanufactured engines that do not comply with the most recent emission standards. Third, we are clarifying the analytical requirements for in-use PM measurement. Fourth, we are making changes to allow partial flow dilution sampling for transient test cycle PM measurement. Fifth, we are clarifying how to account for emission control system regeneration events when calculating not-to-exceed (NTE) results. Sixth, we are making changes to allow the use of fuel rate information derived from the engine control module (ECM) to determine NTE mass emission rate. Seventh, we are specifying a later notification deadline for small-volume manufacturers of marine SI engines that want to qualify for a 2-year delay in the new exhaust emission standards. Eighth, and finally, we are clarifying how our prohibitions apply with respect to handheld small SI engines installed in nonhandheld equipment. 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: Not Yet Determined     (To search for a specific CFR, visit the Code of Federal Regulations.)
Legal Authority: Not Yet Determined   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  04/00/2010    
Direct Final Action  04/00/2010    
Additional Information: SAN No. 5407.
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Chris Laroo
Environmental Protection Agency
Air and Radiation
NVFEL,
Ann Arbor, MI 48105
Phone:734 214-4937
Email: Laroo.Chris@epamail.epa.gov

Rich Wilcox
Environmental Protection Agency
Air and Radiation
AAAQMC,
Ann Arbor, MI 48105
Phone:734 214-4390
Email: Wilcox.Rich@epamail.epa.gov