### { { In Archive In Archive In Archive} McElmo Creek

McElmo Creek McElmo Creek : Acknowledging Receipt of

Acknowledging Receipt of Acknowledging Receipt of 1 - Hour SO Hour SO Hour SO2 Modeling Report Andrew Chew Andrew Chew to: thormel, pflynn 06/03/2011 02:00 PM Cc: Scott Bohning Archive: This message is being viewed in an archive .

Tom/Pat,
I'm writing to acknowledge receipt of the cover letter, 2 hard copies of the report, and the enclosed disk. Scott and I will review the materials and get back to you with any questions . Thank you for forwarding.

- Andrew

------------------------------------------- Andrew Chew, P.E. T: (415) 947-4197 | F: (415) 947-3579 | chew.andrew@epa.gov U.S. EPA, Region 9, Air Permits Office (AIR-3) | 75 Hawthorne St., San Francisco, CA 94105

----- Forwarded by Scott Bohning/R9/USEPA/US on 06/01/2011 04:36 PM -----

From: "Tom Hormel" <thormel@mcvehil-monnett.com> To: Scott Bohning/R9/USEPA/US@EPA Cc: <pflynn@ResoluteEnergy.com> Date: 06/01/2011 04:04 PM Subject: RE: 1-Hour SO2 Modeling Report for McElmo Creek Gas Plant

Scott,

At long last, attached are the final PDF version of the 1-hour SO2 modeling report, using AERMOD, for the McElmo Creek Gas Plant and the transmittal lett er. Per your instructions below, two hard copies o f the report, with one report containing a modeling DVD , has been sent by FedEx to Andrew Chew with delivery scheduled for approximately 10:30 AM PDT o n Friday, June 3.

The modeling files are rather large and not readily amenable to sending by e-mail. However, the DVD accompanying the hard copies of the report contain pertinent AERMAP, meteorological and AERMOD input/output files.

Please contact me if you have any questions.

Thomas Hormel

McVehil-Monnett Associates, Inc.
Vice President & Sr. Project Manager
44 Inverness Drive East, Bldg C.
Englewood, CO 80112

303.790.1332

mcvehil

- monnett

. com

From: Bohning.Scott@epamail.epa.gov [mailto:Bohning.Scott@epamail.epa.gov]Sent : Tuesday , April 26 , 2011 11 : 04 AM

To: thormel@mcvehil-monnett.com Cc: jgilpin @mcvehil-monnett.com; pflynn@rnrc.net Subject: Re: 1-Hour SO2 Modeling Report for McElmo Creek Gas Plant

Tom -

Andrew Chew confirmed that we would like two paper copies of modeling report in addition to electronic one. A single copy of modeling file DVD is enough. (If there is some subset of the DVD that is small enough that it makes sense to send electronically in addition , then please do that, too.)

I think best place to send paper / DVD would be to Andrew:

Andrew Chew AIR-3 US. EPA Region 9 75 Hawthorne St. San Francisco, CA 94105-3901

Thanks!

- Scott B.

-- =+=+=+=+=+=+=+=+=+=+=+=+=+=+= "Scott Bohning" <bohning.scott@epa.gov> U.S. EPA Region 9, AIR-7 415/947-4127 fax-3579

From: "Tom Hormel" <thormel@mcvehil-monnett.com>

To: Scott Bohning/R9/USEPA/US@EPA

Cc: <pflynn@rnrc.net>, < jgilpin @mcvehil-monnett.com>

Date: 04/22/2011 09:08 AM Subject: 1-Hour SO2 Modeling Report for McElmo Creek Gas Plant

Scott,

We have completed our modeling analyses for estimat ing 1-hour SO2 impacts from the flare at the McElmo Creek Gas Plant with modeled background sour ces. We will be finalizing the modeling report and have ready for submittal next week. We have th e following questions pertaining to submittal of th e report and modeling files to you.1. Do you want both electronic and paper copies o f the air modeling report or is an e-mailed electro nic

copy (in PDF) sufficient?

2. If you want a paper copy submittal, how many c opies?

3. Do you want DVDs of the modeling files or do y ou prefer electronic copies only?

4. How many copies of the modeling DVD would you need?

The modeling files submittal will include a readme file to explain the modeling files content, all mod el input and output files, pre-processed meteorological data as received from the UDAQ and AERMAP input/output files.

We look forward to your response.

Thanks,

Thomas Hormel McVehil-Monnett Associates, Inc. Vice President & Sr. Project Manager 44 Inverness Drive East, Bldg C. Englewood, CO 80112
303.790.1332
mcvehil

- monnett

. com

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