----- Forwarded by Melanie King/RTP/USEPA/US on 04/07/2010 12:55 PM

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|"Zwicke, Greg - Portland, OR" <greg.zwicke@por.usda.gov>

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|Melanie King/RTP/USEPA/US@EPA

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|"Johnson, Greg - Portland, OR" <Greg.Johnson@por.usda.gov>

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|04/07/2010 12:20 PM

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|RE: moving on to spark ignition engines

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Melanie,

Here is the spreadsheet I put together based on the information I received

from USDA-NASS, who are the compilers of the Census of Agriculture and the

associated Farm & Ranch Irrigation Survey. Take a look at it, and I expect we

may want to set up a time to talk about the methodology. I'll be tied up here

today until about 3:00 pm your time.

Tomorrow may be better, but I know I already have 2 conference calls (9:30-

10:30 am and 2:00-3:00 pm your time).

Greg

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Greg Zwicke, P.E.

Air Quality Engineer

Air Quality and Atmospheric Change Team

USDA-NRCS

West National Technology Support Center

1201 NE Lloyd Blvd., Suite 1000

Portland, OR 97232

Phone: (503) 273-2434

Fax: (503) 273-2401

E-mail: greg.zwicke@por.usda.gov

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-----Original Message-----

From: King.Melanie@epamail.epa.gov [mailto:King.Melanie@epamail.epa.gov]
Sent: Tuesday, March 30, 2010 5:54 AM

To: Zwicke, Greg - Portland, OR

Subject: RE: moving on to spark ignition engines

No problem Greg, thanks.

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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|"Zwicke, Greg - Portland, OR" <greg.zwicke@por.usda.gov>

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|Melanie King/RTP/USEPA/US@EPA

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|03/30/2010 01:45 AM

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|RE: moving on to spark ignition engines

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Melanie,

I did finally get a little bit of data from the National Agricultural

Statistics Service on irrigation pumps that I think may be useful for helping

us better estimate the inventory of agricultural engines. It's not perfect,
but I think it gets us much closer. The problem is that I am currently

swamped with other EPA rule reviews. I'm hoping to get to take a closer look

at the data I got from NASS by the end of the week, so would it be OK to get

back with you then on what I find out? I know you were shooting for the end

of March, but I know I'm going to be pretty tied up for the next few days.

Greg

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Greg Zwicke, P.E.

Air Quality Engineer

Air Quality and Atmospheric Change Team

USDA-NRCS

West National Technology Support Center

1201 NE Lloyd Blvd., Suite 1000

Portland, OR 97232

Phone: (503) 273-2434

Fax: (503) 273-2401

E-mail: greg.zwicke@por.usda.gov

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-----Original Message-----

From: King.Melanie@epamail.epa.gov [mailto:King.Melanie@epamail.epa.gov]

Sent: Friday, February 26, 2010 7:54 AM

To: Zwicke, Greg - Portland, OR

Subject: moving on to spark ignition engines

Hi Greg,

Now that the diesel engine rule has been signed, we are turning our attention

to the rule for existing spark ignition engines that must be signed by August

10. I would like to avoid some of the issues we had during the interagency

review process on the diesel rule regarding the split between major and area

sources for irrigation engines, so if you have information on how many spark

ignition irrigation sets are located at major sources of HAP versus area

sources, now is the time to speak up. Please let me know if you have any

information that you would like to share.

Thanks!

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

(See attached file: NASS Engine Data Analysis for RICE Rule.xls)