                                                                               
   
MEMORANDUM


DATE:		February 9, 2010

SUBJECT:	Existing Population of Stationary RICE - Attachments 

FROM:	Tanya Parise, EC/R, Inc.
		
TO:		Melanie King, EPA OAQPS/SPPD/ESG
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      The purpose of this memorandum is to document the information used to estimate the 
population of existing stationary engines used to estimate the national impacts associated with the National Emission Standards for Hazardous Air Pollutants for Existing Stationary Reciprocating Internal Combustion Engines (RICE) in 40 CFR part 63, subpart ZZZZ.  Provided in the Attachments to this memorandum are several tables illustrating the Power Systems Research information that was used to estimate the population and projection of stationary spark ignition and compression ignition (CI) engines.  This memorandum contains information supporting the memorandum entitled "Existing Population of Stationary RICE," which is available from the rulemaking docket as Document ID Number EPA-HQ-OAR-2005-0029-0014.  This information supports the population estimates developed to estimate impacts from stationary existing RICE less than or equal to 500 horsepower (HP) that are located at major sources, stationary existing RICE that are located at area sources, and stationary existing non-emergency CI RICE greater than 500 HP located at major sources that are subject to 40 CFR part 63, subpart ZZZZ. 
                                  Attachments
                   Spreadsheet Tables with PSR Information 
                Used to Estimate the Population and Projection 
                             of Stationary Engines
      

      
