20140957 Ver 2_ACP_Permit-Mod_CoverLetter_20190715_20190715

Dominion Energy Services, Inc.
5000 Dominion Boulevard
Glen Allen, VA 23060
DominionEnergy.com
July 15, 2019
BY ELECTRONIC MAIL,
Jeff Poupart
Water Quality Section
North Carolina Department of Environmental Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
Jeff.PoupartCa7ncdenr.goy
Dominion
;PWOO Energy,
Re: Atlantic Coast Pipeline Project
401 Water Quality Certification — Supplement to Individual Certification # WQC004162
Dear Mr. Poupart:
Please find enclosed a supplement to the Approval of Individual401 Water Quality Certification and
Tar- Pamlico/Neuse Riparian Buffer Impacts Authorization (Individual Certification # WQC004162)
for the proposed Atlantic Coast Pipeline in North Carolina. As specified in Condition #33 of the
Individual Certification, Atlantic Coast Pipeline, LLC (Atlantic) is providing the enclosed
supplemental information to address project modifications due to minor route adjustments and new
workspaces since the approval letter from the North Carolina Department of Environmental Quality
(NCDEQ) in January 2018.
Newly delineated or impacted features based on these project modifications are identified on maps
enclosed in Attachment 1, with red polygons representing new waterbodies and bright green polygons
representing new wetlands. In addition, Attachment 2 includes updated impact tables. Table 1
includes all impacts, with new features identified in colored text. Tables 2 and 3 are HUC 8 summary
tables for wetlands and waterbodies, respectively.
Impacts to wetlands and waterbodies associated with construction of the ACP in North Carolina will
include 39,077 linear feet of temporary stream impacts and 452.18 acres of temporary wetland
impacts. In addition, impacts will include 156.93 acres of wetland conversion impacts, 132 linear feet
of permanent impacts to waterbodies, and 0.31 acre of permanent impacts to wetlands.
Revisions to the previously submitted impacts are primarily due to changes related to access roads, as
well as updates to impacts associated with minor route adjustments. Datasheets for features with
impacts that are new since the approval in January 2018 are included as Attachment 3 on the enclosed
DVD.

NCDEQ — Individual Water Quality Certification
Atlantic Coast Pipeline — Supplement Materials
July 15, 2019
Page 2 of 3
In addition, Atlantic is providing an updated riparian buffer impact table based on waterbodies that
are subject to the riparian buffer permitting rules. Table 5 in Attachment 2 is an update to the same
table provided in the original permit application materials. Overall, there is a reduction of 42,154
square feet (approximately one acre) of proposed overlap of Project workspace with riparian buffers
due to project changes. Maps that correspond to Table 5 are included in Attachment 1. Based on the
riparian buffer impacts review, no additional compensatory mitigation for riparian buffers is required
for the Project.
Atlantic has reviewed the conditions of the Individual Certification and updates are provided
according to each of the conditions listed below.
Condition 1- Impacts Approved; Atlantic has enclosed updated impact tables in Attachment 2, with
associated maps in Attachment 1.
Condition. 2- Compensatory Mitigation. As noted above, no addition compensatory mitigation is
required based on the changes to riparian buffer impacts. Changes to compensatory mitigation
required for wetland and/or waterbody impacts will be coordinated with the U.S. Army Corps of
Engineers — Wilmington District, and should additional mitigation be required, Atlantic will secure
mitigation credits prior to completing work at any new impact sites that require compensatory
mitigation.
Atlantic has reviewed and understands that the remaining conditions (Individual 401 Water Quality
Certification and Tar-Pamlico/Neusc Riparian Buffer Impact Authorization; Conditions 3-39) with
the original approval letter dated January 26, 2018, remain applicable and are unchanged based on the
modifications submitted herein.
Although Atlantic's verification is currently subject to a temporary administrative suspension pending
resolution of unrelated Section 401 modifications in West Virginia (applicable to the verifications in
the Huntington and Pittsburgh Districts), we are providing this supplement with the expectation that
the suspension will be eligible to be lifted and the verification reinstated in the third quarter of 2019.
Atlantic respectfully requests that NCDEQ review the enclosed information and advise Atlantic
representatives if there are additional fees necessary for the review of this modification. Atlantic
representatives are available to discuss the enclosed materials at your earliest convenience. Please
contact Spencer Trichell at [phone] or Suenter.Trichell(cbdominionenergy.com, if there are
questions regarding this submittal.
Please direct written responses to:
Spencer Trichell
Dominion Energy Services, Inc.
5000 Dominion Boulevard
Glen Allen, Virginia 23060

NCDEQ — Individual Water Quality Certification
Atlantic Coast Pipeline — Supplement Materials
July 15, 2019
Page 3 of 3
Sincerely,
Richard GangIe
Director Environmental Services
cc: Spencer Trichell, Dominion Energy
Stephanie Collins, Dominion Energy
Enclosures: Attachments and 2 DVDs — Electronic versions of all submittal materials