DAQ-2024-009104

DAQE-GN115320016-24

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Dani Baldwin
MountainWest Pipeline, LLC
P.O. Box 45922
Salt Lake City, Utah 84145

Re: Replacement-in-Kind Determination for the Kastler Marushack Compressor Station

Dear Mr. Checketts,

This letter is in response to the notification submitted on May 20, 2024, concerning the exchange of three
400-barrel storage tanks (two condensate tanks TNK-1 and one waste oil tank TNK-8) at the Kastler
Marushack Compressor Station. Utah Division of Air Quality has determined that the replacement of the
three tanks meets the Replacement-In-Kind rule R307-401-11.

MountainWest Pipeline shall notify the Director in writing when the replacement of the three has been
completed and is operational. To ensure proper credit when notifying the Director, send your
correspondence to the Director, attn: NSR Section.

The replacement of the three tanks shall operate under the conditions listed in Approval Order
DAQE-AN115320012-21.

Please direct any technical questions regarding this letter to Mr. Tad Anderson, who may be reached at
[phone].

Sincerely,

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Jon L. Black, Manager
New Source Review Section

JLB:TA:jg
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195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144820 • Salt Lake City, UT 84114-4820
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gov
Printed on 100% recycled paper
State of Utah

SPENCER J. COX
Governor

DEIDRE HENDERSON
Lieutenant Governor

Department of
Environmental Quality

Kimberly D. Shelley
Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird
Director

* ) ' & — 0 ' C v A ? A C A B w B E ˜
July 4, 2024
Via Certified Mail

May 20, 2024

Utah Division of Air Quality
Attn: Director
P.O. Box 144820
Salt Lake City, UT 84114-4820

RE: MountainWest Pipeline, LLC - Kastler Marushack Compressor Station
Approval Order Number DAQE-AN115320012-21
Replacement-in-Kind for Proposed Tanks

Dear Mr. Bird:

Upon receipt of a determination of substantial equivalency, MountainWest Pipeline, LLC will start
construction to replace two proposed 400-barrel (bbl) (16,800 gallons each) atmospheric
condensate tanks and one 400-bbl used oil tank. The tanks will be replacement-in-kind for all
three existing 400-bbl tanks. A fourth 400-bbl atmospheric condensate tank will be removed and
not replaced. The proposed replacement project is scheduled for August 2024.

The following tanks will be part of the replacement-in-kind project:

1. Permit ID TNK-1 (replaced)
2. Permit ID TNK-1 (replaced)
3. Permit ID TNK-1 (removed)
4. Used Oil Tank (insignificant, replaced)

As it pertains to R307-401-11(2), MountainWest Pipeline, LLC requests written concurrence from
the Division that additional permitting actions or requirements are not required for the three
proposed tanks.

Questions regarding this submittal should be referred to Dani Baldwin at [phone] or
[e-mail].

Sincerely,

Dani Baldwin
Environmental Specialist
MountainWest Pipeline, LLC
P.O. Box 45922
Salt Lake City, Utah 84145
Tad Anderson <[e-mail]>
Tanks Replacement-In-Kind for AO DAQE-AN115320012-21 - Kastler Marushack CS
Baldwin, Dani <[e-mail]>Wed, May 22, 2024 at 10:40 AM
To: Tad Anderson <[e-mail]>
Cc: Jon Black <[e-mail]>
Hi Tad,

I agree. The removal of the one 400-bbl condensate tank can be taken into consideraon during the next air permit modificaon/amendment.

MountainWest Pipeline requests a replacement-in-kind leer for the three tanks.

Thank you for the email.

Dani
Dani Baldwin | She/Her/Hers | Williams
Environmental Specialist | MountainWest Pipeline
Cell: [phone] | P.O. Box 45922, SLC, UT 84145

From: Tad Anderson <[e-mail]>
Sent: Wednesday, May 22, 2024 10:17 AM
To: Baldwin, Dani <[e-mail]>
Cc: Jon Black <[e-mail]>
Subject: [EXTERNAL] Re: Tanks Replacement-In-Kind for AO DAQE-AN115320012-21 - Kastler Marushack CS

Dani,

I have reviewed your request for a replacement in kind for the three tanks and the removal. In order to officially remove the tank, UDAQ would have
to administratively amend the approval order. I have never heard of a UDAQ compliance inspector writing a violation for equipment not being in
operation. I need to know if you want to administratively amend the AO to remove the tank or just a replacement in kind letter for the three tanks
and disregard the removed tank. The removed tanks can be taken into consideration during the next permit modification/amendment. Please let
me know which course of action you want me to take.

Thanks,

Tad

On Tue, May 21, 2024 at 11:47 AM Baldwin, Dani <[e-mail]> wrote:
Hello Tad,

The aached was cerfied mailed today.

The Kastler Marushack Compressor Staon proposes to replace two 400-barrel (bbl) (16,800 gallons each) atmospheric condensate tanks and one 400-bbl
used oil tank. The tanks will be replacement-in-kind for all three exisng 400-bbl tanks. A fourth 400-bbl atmospheric condensate tank will be removed and
not replaced. The proposed replacement project is scheduled for August 2024. MountainWest Pipeline request wrien concurrence that addional
perming acons or requirements are not required for the three proposed tanks.

Thank you,
Dani
Dani Baldwin | She/Her/Hers | Williams
Environmental Specialist | MountainWest Pipeline
Cell: [phone] | P.O. Box 45922, SLC, UT 84145

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