----- Forwarded by Melanie King/RTP/USEPA/US on 07/23/2010 09:30 PM

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|Melanie King/RTP/USEPA/US

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|Cortney_Higgins@omb.eop.gov

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| Cc: |

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|Fred Talcott/DC/USEPA/US@EPA, RobertJ Wayland/RTP/USEPA/US@EPA

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|07/20/2010 02:56 PM

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|cost/ton estimates for SI RICE

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Hi Cortney,

One other piece of information that I thought would be of interest to you is

the estimate of the cost of control per ton of pollutant reduced.

The attached spreadsheet provides the estimates for 2SLB, 4SLB, and 4SRB nonemergency engines at both major and area sources. For 2SLB and 4SRB engines

at major sources, we looked at the cost/ton of going from a floor that is

based on no add-on emissions control to an above-the-floor level based on

emission levels achieved using oxidation catalyst for 2SLB and NSCR for 4SRB.

I didn't provide a cost/ton for 4SLB engines at major sources because the

floor is already based on levels achieved using oxidation catalyst control.

For 2SLB, 4SLB, and 4SRB engines at area sources, we looked at the annual cost

for going beyond GACT (management practices) and establishing emission limits

based on the use of oxidation catalyst or NSCR for those engines.

(See attached file: Existing SI RICE NESHAP cost per ton estimates

7-20-10.xls)

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