-----Forwarded by Melanie King/RTP/USEPA/US on 04/27/2010 08:39PM -----
To: Melanie King/RTP/USEPA/US@EPA 
From: Tony Robledo/R6/USEPA/US 
Date: 04/27/2010 06:15PM 
cc: Cynthia Kaleri/R6/USEPA/US@EPA 
Subject: Fw: RE: Engine Estimates
Melanie - here's one of your requested items - I'll send the rest in another email to follow.  
Hope this is helpful - feel free to contact me or the state folks directly if you have questions 
or need additional information.
 
 
-----Forwarded by Tony Robledo/R6/USEPA/US on 04/27/2010 05:05PM -----
To: Tony Robledo/R6/USEPA/US@EPA 
From: Keith Jordan <Keith.Jordan@LA.GOV> 
Date: 04/23/2010 07:57AM 
Subject: RE: Engine Estimates 
 
 
(See attached file: Engines in 2008 EI.xlsx)
Tony,

First Tab:
Our Emissions Inventory people put together the list on the first tab that was to include all Internal 
Combustion Engines. I tried to leave in only the ones fired by Natural Gas.

Second Tab:
The question of which engines have controls such as SCR is more difficult. Air Permits picked put three 
reporting requirements from the TEMP requirements library: Requirement ID =     1485673 or 1485674 
or 471593. I wrote a query to look for Internal Combustion engines with those requirements.

    
Thanks,  
Keith Jordan  
Surveillance Division  
225-219-3613 
From: Robledo.Tony@epamail.epa.gov [mailto:Robledo.Tony@epamail.epa.gov]  
Sent: Thursday, April 15, 2010 2:48 PM 
To: braun@adeq.state.ar.us; Keith Jordan; debra.mcelroy@state.nm.us; Brad_Flaming_-
_brad.flaming@deq.ok.gov; stahiri@tceq.state.tx.us 
Cc: kimbrough@adeq.state.ar.us; Betty Brousseau; richard.groshong@deq.ok.gov; Laura_Clarke_-
_lclarke@tceq.state.tx.us 
Subject: Engine Estimates

Do you know of an estimates of how many of these engines are controlled in your State - realize that this 
may take some time so if you can get back to me by Friday April 23rd.      
 
EPA HQ's is trying to get a handle on what the current landscape is for rich burn spark ignition (gas-fired) 
engines in terms of how many of the existing engines that are already in use that have emission controls 
(non-selective catalytic reduction or NSCR) installed.    
 
The reason is that EPA HQ's is looking at what the impacts of the NESHAP for existing spark ignition 
engines would be if controls were required for those engines, and it would be helpful if they had some 
idea of how many of them already have these controls even in the absence of the NESHAP.  The 
engines of most concern are those that are <500 HP at major sources of HAP and any HP at area 
sources of HAP, since EPA already has limits on the ones that are >500 HP at major sources.  
 
Tony Robledo  
U.S. EPA Region 6  
Air Toxics Section  
1445 Ross Ave.  
Dallas, TX  75202  
214.665.8182 


