-----Forwarded by Melanie King/RTP/USEPA/US on 04/27/2010 08:38PM -----
To: Melanie King/RTP/USEPA/US@EPA 
From: Tony Robledo/R6/USEPA/US 
Date: 04/27/2010 06:17PM 
cc: Cynthia Kaleri/R6/USEPA/US@EPA 
Subject: Fw: Re: rich burn engines

Tony,

After checking with the inspectors in the different districts here in Arkansas, here is a number we 
came up with, now this number only represents engines that have the Non-Selective Catalytic 
Reduction (NSCR) installed  Located at area source of HAPs, any HP would be around thirty 
(30) engines with NSCR and at the major source of HAPs, is around five (5) engines under 500 
HP with NSCR. These numbers are not exact, but are probably pretty close to what is located in 
this state. Bottom line is a very small percentage of these have a NSCR. We also feel that the 
number of engines at a area source for HAPs, that does not have a NSCR is around 700 engines 
and at a major source for HAPS, that does not have a NSCR is around 400 engines. These are 
estimates of what is in the state of Arkansas at permitted facilities only.
 
Brent Day
Inspector Supervisor
Air Division, Districts 8, 11, & 12
ADEQ
 
 
Tony, this is the best information I could squeeze out of our system.  

*         Approximately 1,663 rich burn engines are in operation
*         Approximately 1,034 (62%) of these engines are controlled

Unfortunately,  that’s the most detail I can pull from our database.  The numbers for rich burns <500 
HP at major sources and rich burns located at area sources are not available.  Please let me know if you 
have any questions. 


Brad Flaming, Environmental Programs Manager
Compliance Section
Air Quality Division
(405) 702-4151
brad.flaming@deq.ok.gov
 
 
  Tony, 
  
After working with our data steward here is what we came up with; <500 HP at major sources  of HAP 
w/controls (2), w/out controls (19); any HP at area sources  of HAP w/controls (90).  If you have any 
questions, please call or email. 
  
Donald Flores 
Compliance Manager 
Air Quality Bureau 
(505) 476-4359 
donald.flores@state.nm.us   
 
Tony, 
  
Based on the 2008 point source emissions inventory data, the TCEQ 
received emissions data for 1,418 Rich Burn Spark Ignited (gas-fired) IC 
engines that were operated at entities subject to the TCEQ's point source 
emissions inventory reporting requirements.  Of these, only 552 engines 
have an emissions control device.  51 engines were reported to be <500 HP 
and 501 were reported to be >500 HP. 
  
If you need additional information, please let me know. 
  
Michael De La Cruz 
Team Leader 
Air Fees, Point Source EI, & Area Source EI Team 
TCEQ Air Quality Division 
(512) 239-0259 
 
 
 
 Melanie King---04/14/2010 03:14:04 PM---Hi Cindy and Tony, My turn to come to you with 
a question - we're trying to get a handle on what the
  
From:
  
Melanie King/RTP/USEPA/US
  
To:
  
Cynthia Kaleri/R6/USEPA/US@EPA, Tony Robledo/R6/USEPA/US@EPA
  
Date:
  
04/14/2010 03:14 PM
  
Subject:
  
rich burn engines
 
 
 
Hi Cindy and Tony, 
My turn to come to you with a question - we're 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 have emission controls (non-selective catalytic 
reduction or NSCR) installed.  The reason I'm asking this is that we are 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 we had some idea of how many of them already 
have these controls even in the absence of the NESHAP.  The engines we'd be concerned 
with are those that are <500 HP at major sources of HAP and any HP at area sources of 
HAP, since we already have limits on the ones that are >500 HP at major sources.  Do you 
know of any estimates of how many of these engines are controlled for the states in Region 
6?   
 
Melanie King 
Energy Strategies Group 
Sector Policies and Programs Division 
Office of Air Quality Planning and Standards 
U.S. Environmental Protection Agency 
 
Mail Code D243-01 
RTP, NC  27711 
 
Phone:  (919) 541-2469 
Fax:       (919) 541-5450 
king.melanie@epa.gov

