-----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