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EPA/AR RIN: 2060-AP08 Publication ID: Spring 2010 
Title: Revisions to Test Method for Determining Stack Gas Velocity Taking Into Account Velocity Decay Near the Stack Walls 
Abstract: This test method enables the representative measurement of pollutant emissions and/or total volumetric flow from stationary sources. When the method was originally developed, it addressed only sources where the flow measurements were made in locations with circular cross-sections within an exhaust stack. This technical update to the test method will address flow measurement locations with both circular and rectangular cross-sections. The revisions also include changes that increase the accuracy of the method and simplify its application. The primary users of the method will be owners and operators of utility units subject to the Acid Rain Program under title IV of the Clean Air Act and certain large electric generating units and large non-electric generating units that are subject to the nitrogen oxides (NOX) state implementation plan (SIP) call under title I of the Clean Air Act. These sources use volumetric stack flow rate monitors in order to measure sulfur dioxide (SO2) and NOX mass emissions and heat inputs emissions and must conduct periodic relative accuracy test assessments (RATAs) of the flow rate monitors at these units. 
Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 60   
Legal Authority: Clean Air Act title I   
Legal Deadline:  None
Action Date FR Cite
NPRM  08/25/2009  74 FR 42819   
NPRM Comment Period End  10/26/2010    
Final Action  10/00/2010    
Additional Information: SAN No. 5237; EPA publication information: NPRM -; EPA Docket information: EPA-HQ-OAR-2008-0697.
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:
Jason Dewees
Environmental Protection Agency
Air and Radiation
Research Triangle Park, NC 27711
Phone:919 541-9724
Fax:919 541-0516

Conniesue Oldham
Environmental Protection Agency
Air and Radiation
D205-02, E143-02,
Research Triangle Park, NC 27711
Phone:919 541-7774
Fax:919 541-0516

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