20140957 Ver 2_Email - ACP Stabilization Plan_20181204

Strickland, Bev
From: Spencer Trichell <[e-mail]>
Sent: Tuesday, December 04, 2018 2:30 PM
To: 'McLendon, C S CIV USARMY CESAW (US)'; Gibby, Jean B CIV USARMY CESAW (US);
'Dailey, Samantha J CIV USARMY CESAW (US)'
Cc: Higgins, Karen; Richard B Gangle; Brian M Wright
Subject: [External] ACP Stabilization Plan
Attachments: Bridge over WB.JPG; ECD's and mats installed in WL WHLH 023ejpg; Equipment
tracking on matsjpg; Pipe on Mats.JPG; ACP Stabilization Plan Letter - Gibby.pdf
Ms. Gibby,
I have attached the ACP stabilization plan following our discussion on November 30, 2018, regarding
activities Atlantic proposes to complete and maintain during the suspension period of Nationwide
Permit 12. 1 have also attached photos of some representative activities for your reference.
Upon further review, there is no open trench in wetlands in North Carolina where pipe has not been
installed. Therefore, Atlantic is not proposing to install and backfill any pipe in wetlands or
waterbodies in North Carolina.
Please let me know if you have questions."
Regards,
Spencer Trichell
Manager -Environmental
Dominion Energy Services, Inc.
5000 Dominion Blvd
Glen Allen, VA 23060
0:(804)-273-3472 M. (804)-263-5980
spencer.trichell@dominionenerge .cy om
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Dominion Resources Services, Inc.
5000 Dominion Boulevard,
Glen Allen, VA 23060
December 3, 2018
BY ELECTRONIC MAIL
Ms. Jean Gibby
U.S. Army Corps of Engineers — Wilmington District
Regulatory Division
3331 Heritage Trade Drive, Suite 105
Wake Forest, North Carolina 27587
Re: Atlantic Coast Pipeline — Stabilization Plan
Dear Ms. Gibby:
:601Dominion-
In
response to your letter of November 20, 2018, in which the U.S. Army Corps of Engineers (USAGE)
granted Atlantic Coast Pipeline, LLC's (Atlantic) request for administrative stay of Nationwide Permit
12 for the Atlantic Coast Pipeline (ACP), Atlantic is providing the following details on its proposed
stabilization and maintenance activities.
1. In locations where erosion control devices (ECDs) have been installed within delineated wetlands
or waterbodies, typical maintenance will be performed by hand. However Atlantic plans to
maintain the ECDs with equipment where necessary to provide permit -required environmental
protections (e.g., replacement or enhancement of ECDs that may exceed hand labor capacity such
as installation of bulkheads or devices to maintain slope stability near wetlands/waterbodies;
removal of heavily accumulated sediment along ECDs for proper functioning, etc.). ACP's
erosion and sediment control plans are performance-based, thus sometimes requiring adaptive
management to mitigate for unforeseen conditions that may arise.
2. If sediment leaves the workspace due to an event that overwhelms the ECD design and deposits
into a wetland or waterbody, Atlantic will make notification to USACE and then remove the
sediment by hand or equipment (commensurate with quantity of sedimentation) to prevent further
migration of sediment into wetlands or waterbodies.
3. Where timber mats are already installed and in place in wetlands, or bridges are already installed
and in place over waterbodies, Atlantic will continue to use and maintain these structures. In
addition, Atlantic will continue construction activities on the mats as long as those activities do
not result in a discharge of dredge or fill material to wetlands or waterbodies. Construction
activities will include stringing of pipe, welding and coating activities.

US Army Corps of Engineers — Wilmington District
Atlantic Coast Pipeline — Stabilization Plan
December 3, 2018
Page 2 of 2
Atlantic requests USACE concurrence that the activities identified above are allowable.
Atlantic appreciates the coordination to date and looks forward to continuing to work with you on this
project. Please contact Spencer Trichell at [phone] or [e-mail], if
there are questions regarding this submittal.
Please direct written responses to:
Leslie Hartz
Atlantic Coast Pipeline, LLC
707 East Main Street, 1W h Floor
Richmond, Virginia 23219
Sincerely,
CaEn'
Bering and Construction —Strategic Projects
cc: Spencer Trichell, Dominion Energy
Samantha Dailey, SAW
Scott McLendon, SAW
Karen Higgins, NCDEQ