----- Forwarded by Melanie King/RTP/USEPA/US on 04/15/2010 03:07 PM

----- |------------> | From: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |Eric Sturm/R7/USEPA/US |>--------------------------------------------------------------------------- ---------------------------------------------------------------| |------------> | To: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |Melanie King/RTP/USEPA/US@EPA |>--------------------------------------------------------------------------- ---------------------------------------------------------------| |------------> | Cc: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |Robert Cheever/R7/USEPA/US@EPA, Lisa Hanlon/R7/USEPA/US@EPA |>--------------------------------------------------------------------------- ---------------------------------------------------------------| |------------> | Date: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |04/15/2010 02:10 PM |>--------------------------------------------------------------------------- ---------------------------------------------------------------| |------------> | Subject: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |Re: Fw: rich burn engines |>--------------------------------------------------------------------------- ---------------------------------------------------------------|

Melanie, In regards to your question to Lisa, I don't believe we have a good idea of controls on engines under 500 HP at major sources of HAP. We're currently reviewing each of our state's policies and records on CI and SI RICE. Of the 12 rich burn SI found so far from the review, none have controls like NSCR (but I imagine they do have some sort after treatment device as supplied by the manufacturer). 6 of the 12 have a limit on hourly operations. Sorry we're not of much help, but please give me a call if you would like to discuss further.

Thanks Eric Sturm Environmental Engineer | EPA | R7 Air Compliance | (P)913.551.7377 | (C)402.310.4211 |------------> | From: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |Robert Cheever/R7/USEPA/US |>--------------------------------------------------------------------------- ---------------------------------------------------------------| |------------> | To: | |------------>>---------------------------------------------------------------------------

---------------------------------------------------------------| |Eric Sturm/R7/USEPA/US@EPA |>--------------------------------------------------------------------------- ---------------------------------------------------------------| |------------> | Date: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |04/15/2010 12:39 PM |>--------------------------------------------------------------------------- ---------------------------------------------------------------| |------------> | Subject: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |Re: Fw: rich burn engines |>--------------------------------------------------------------------------- ---------------------------------------------------------------|

Eric, Based on what I have done so far, I can positively identify 12 rich burn RICE; 11 in Nebraska and 1 in Iowa. However, I do not have enough detail information several other RICE in both of these states to say that there are not more. As for Missouri and Kansas; I do not as yet have enough detail information to be able to specify the RICE types. For the 12 known; none that I am aware of have specific controls. 3 are "stand-by units and 3 are emergency generators that are limited to the amount of run-time per year. As I get more detailed information I hope to be able to get to this kind of detail.

Bob

|------------> | From: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |Eric Sturm/R7/USEPA/US |>--------------------------------------------------------------------------- ---------------------------------------------------------------| |------------> | To: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |Robert Cheever/R7/USEPA/US@EPA |>--------------------------------------------------------------------------- ---------------------------------------------------------------| |------------> | Date: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |04/15/2010 09:00 AM |>--------------------------------------------------------------------------- ---------------------------------------------------------------| |------------> | Subject: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |Fw: rich burn engines |>------------------------------------------------------------------------------------------------------------------------------------------|

Bob, From your research so far from permits for engines/compressor stations, did you find any rich burn spark ignition engines with controls? If so, what kind of controls? Also, how many rich burn SI engines did you find total?

Thanks Eric Sturm Environmental Engineer | EPA | R7 Air Compliance | (P)913.551.7377 | (C)402.310.4211 ----- Forwarded by Eric Sturm/R7/USEPA/US on 04/15/2010 08:52 AM ----- |------------> | From: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |Lisa Hanlon/R7/USEPA/US |>--------------------------------------------------------------------------- ---------------------------------------------------------------| |------------> | To: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |Eric Sturm/R7/USEPA/US@EPA |>--------------------------------------------------------------------------- ---------------------------------------------------------------| |------------> | Date: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |04/15/2010 08:50 AM |>--------------------------------------------------------------------------- ---------------------------------------------------------------| |------------> | Subject: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |Fw: rich burn engines |>--------------------------------------------------------------------------- ---------------------------------------------------------------|

Lisa Hanlon EPA Region 7 901 N. 5th St. Kansas City, KS 66101 913.551.7599 hanlon.lisa@epa.gov ----- Forwarded by Lisa Hanlon/R7/USEPA/US on 04/15/2010 08:50 AM ----- |------------> | From: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |Melanie King/RTP/USEPA/US |>--------------------------------------------------------------------------- ---------------------------------------------------------------| |------------> | To: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |Lisa Hanlon/R7/USEPA/US@EPA |>---------------------------------------------------------------------------

---------------------------------------------------------------| |------------> | Date: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |04/15/2010 08:47 AM |>--------------------------------------------------------------------------- ---------------------------------------------------------------| |------------> | Subject: | |------------> >--------------------------------------------------------------------------- ---------------------------------------------------------------| |rich burn engines |>--------------------------------------------------------------------------- ---------------------------------------------------------------|

Hi Lisa, I'm hoping you can help me with a question. We're trying to get ahandle 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 7? 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