----- Forwarded by Melanie King/RTP/USEPA/US on 04/16/2010 02:49 PM

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|Umesh Dholakia/R2/USEPA/US

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|Melanie King/RTP/USEPA/US@EPA

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|04/16/2010 02:27 PM

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|Re: rich burn engines

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NY has NOx RACT rules for existing major sources and the engines can meet the

NOx limit by low emission combustion techniques- small engines do not have any

NOx controls as I informed you earlier. FYI.

From:•Melanie King/RTP/USEPA/US

To:•Umesh Dholakia/R2/USEPA/US@EPA

Date:•04/16/2010 12:26 PM

Subject:•Re: rich burn engines

Great, thanks so much for your help, I really appreciate it.

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

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|Umesh Dholakia/R2/USEPA/US

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|Melanie King/RTP/USEPA/US@EPA

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|04/16/2010 11:46 AM

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|Re: rich burn engines

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There are many more without controls...%? I guess 2-5% may have controls.

From:•Melanie King/RTP/USEPA/US

To:•Umesh Dholakia/R2/USEPA/US@EPA

Date:•04/16/2010 09:23 AM

Subject:•Re: rich burn engines

Thanks Umesh! On the NJ engines, do you know how many total engines there are

(including uncontrolled ones) - so that we can say X percent have controls?

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

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|Umesh Dholakia/R2/USEPA/US

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|Melanie King/RTP/USEPA/US@EPA

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|04/16/2010 09:17 AM

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|Re: rich burn engines

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Hi! Melanie:

PR and VI do not have any control requirements for rich burn spark ignition

gas fired engines- there are no gas fired engines.

In NJ-- Here are the findings -based on a 2008 list2 Rich Burn NG engines with < 500 BHP controlled by NSCR ( non selective

catatlytic

reduction)

1 Rich Burn NG engine at 500 BHP controlled by NSCR

6 Lean Burn NG engines at < 500 BHP controlled by Catalytic Oxidizer

There is a larger number of NG engines > 500 BHP with add on control.

In NY- to the best of my knowledge- there is no control requirement for spark

ignition engines. For a gas fired engine- generally NY would require a SCR

control anyway. If I find anything more I will let you know.

Umesh

From:•Melanie King/RTP/USEPA/US

To:•Umesh Dholakia/R2/USEPA/US@EPA

Date:•04/15/2010 09:45 AM

Subject:•rich burn engines

Hi Umesh, I'm hoping you can help me with a question. We're trying to get a

handle on what the current landscape is for rich burn spark ignition (gasfired) 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 upcoming final 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 2?

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