-----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) 239-0259Melanie 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