ACP Cumberland CY10a - Wet Pond Design Submittal INCOMPLETE PAGES 09062018

Dominion Energy Services,inc. ' Dominion
5000Glen Boulevard Energy
Glen Allen,VA 23060 •NO
Dominion Energy.corn
September 5, 2018
N.C. Department of Environmental Quality
DEMLR Stormwater Program
512 N. Salisbury Street
1612 Mail Service Center
Raleigh, NC 27699-1612
Attention: Jeanette Powell
Reference: State Stormwater Notice of Intent (NOI)
SWU-101 Storm Water Permit Application (Resubmission)
Storm Water Project Number—SW6180702
ACP Fayetteville Contractor Yard—CY10a
Cumberland County
Fayetteville, NC
Mrs. Powell:
Dominion Energy Transmission Inc. (DETI) on behalf of Atlantic Coast Pipeline,
LLC is submitting the enclosed revised SWU-101 Storm Water Permit Application
for the Fayetteville Contractor Yard (CY10a) located within the Fayetteville Region.
This revised application is in response to the Request for Additional Information
dated August 23, 2018.
The work is being completed in association with Atlantic Coast Pipeline,LLC's
application to the Federal Energy Regulatory Commission (FERC) for a Certificate of
Public Convenience and Necessity to construct and operate the Atlantic Coast
Pipeline, docket# CP15-554-000. DETI is seeking an individual permit from the
DWQ.
The proposed Atlantic Coast Pipeline is an interstate natural gas transmission
pipeline that would serve multiple public utilities and their growing energy needs in
Virginia and North Carolina. Atlantic Coast Pipeline LLC, a company formed by
four major, regionally based energy companies: Dominion, Duke Energy, Piedmont
Natural Gas and Southern Company Gas, will develop,construct and operate the
Atlantic Coast Pipeline.
This revised application is directed towards construction activities associated with
the Fayetteville Contractor Yard (CY10-A) that will result in permanent facilities that
will be located in areas subject to North Carolina's post-construction stormwater

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permitting requirements. DETI has separately submitted Erosion and Sediment
Control Plans for approval, and sought coverage under North Carolina's NPDES
general permit for construction stormwater discharges associated with the Atlantic
Coast Pipeline. The Erosion and Sediment Control plan was approved by NCDEQ
and received coverage under permit CUMBE-2018-036 on April 4, 2018.
The facility layout has been revised to include wet detention ponds in place of the
infiltration trenches previously proposed. A site plan showing the location of the
wet ponds and proposed erosion and sediment control best management practices
are included with this package. DETI's use of the contractor yard is temporary and
will be restored to preconstruction conditions upon completion of pipeline
construction.
If you should have any questions or require additional information concerning this
letter or attachments,please contact Staci Rogge-Atlantic Coast Pipeline, Dominion
Energy Services, Inc. at 804-273-2906 at your convenience or via e-mail at
[e-mail]
Sincerely,
WC/rLeslie Hartz
Vice President-Engineering and Construction-Strategic Projects
Dominion Energy Transmission Inc.
Attachment 1: O&M Form
Attachment 2: SuppEZ Form
Attachment 3: Revised Fayetteville Contractor Yard Plans
cc: Spencer Trichell-Dominion Energy Transmission Inc.
Staci Rogge-Dominion Energy Transmission, Inc.
Scott Robinson-ERM

risoDominion Energy Services,Inc. mig Dominion
5000 Dominion Boulevard Energy®
Glen Allen,VA 23060
DominionEnergy.00m
Attachment#1
O&M Form

Operation & Maintenance Agreement
Project Name: ACP Cumberland Contractor Yard
Project Location: 2808 Downing Road, Fayetteville, NC 28312
Cover Page
Maintenance records shall be kept on the following BMP(s). This maintenance record shall be kept in a log in a known set
location. Any deficient BMP elements noted in the inspection will be corrected, repaired, or replaced immediately. These
deficiencies can affect the integrity of structures, safety of the public, and the pollutant removal efficiency of the BMP(s).
The BMP(s) on this project include (check all that apply& corresponding O&M tables will be added automatically):
Bioretention Cell Quantity: Location(s):
Dry Detention Basin Quantity: Location(s): -
Grassed Swale Quantity:_ Location(s):
Green Roof Quantity: Location(s):
Infiltration Basin Quantity: Location(s):__
Infiltration Trench Quantity: Location(s):
Level SpreaderNFS Quantity: Location(s):
Permeable Pavement Quantity: Location(s):
Proprietary System Quantity: Location(s):
Rainwater Harvesting Quantity: Location(s):
Sand Filter Quantity: )I Location(s):_
Stormwater Wetland Quantity: Location(s):
Wet Detention Basin Quantity: 2 Location(s): Cumberland Contractor Yard _
Disconnected Impervious Area Present: No Location(s):_ _
User Defined BMP Present: No Location(s):
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed
for each BMP above, and attached O&M tables. i agree to notify NCDENR of any problems with the system or prior to any
changes to the system or responsible party. Dominion will perform Operation and Maintenance on the BMPs listed on this O&M
Agreement while Dominion occupies the site. Upon completion of the project and termination of the site use, the site will be
returned to pre-construction condition, BMPs removed, and operation and maintenance activities terminated by Dominion.
Responsible Party: Leslie Hartz-Vice President-Engineering &Construction -Strategic
Title&Organization: Dominion Energy Transmission Inc. on behalf of Atlantic Coast Pip
Street address: 707 East Main Street
City, state, zip: Richmond,VA 23219
Phone number(s): 804-771-4468
Email: [e-mail]
Signature: L_ Date: VS—At
1, x. , IJAwtl3 , a NotaryPublic for the State of U;r ,,r,,_G„
�
County of 0 ft -� -LW , do hearby certify that L k� �V .P�OJl�7
personally appeared before me this 54- day of pAy1/4.93,4,,k, and
acknowledge the due execution of the Operations and Maintenance Agreement .
Witness my hand and official seal, .
. Regina J. Davis
0` 'm`�ti Commonwealth of Virginia
i t to Notary Public
"; .`4''_ ' ,, Commission No.219957
.w "z My Commission Expires 4130/2020
STOgz My commission expires 9/4/2018
Version 1.4 d&M Manual Page 1 of 5

STORM-EZ 9/4/2018
Version 1.4 O&M Manual Page 2 of 5

Wet Detention Pond Maintenance Requirements
The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if
one is provided.
Important maintenance procedures:
Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the
- basin should be watered twice weekly if needed, until the plants become established (commonly six weeks).
No portion of the wet detention pond should be fertilized after the first initial fertilization that is required to
establish the plants on the vegetated shelf.
Stable groundcover should be maintained in the drainage area to reduce the sediment load to the wet detention
-
basin.
If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the
- emergency drain should be minimized to the maximum extent practical.
- Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected once a month and within 24 hours after every storm event
greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance should be kept in a
known set location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire BMP Trash/debris is present. Remove the trash/debris.
The perimeter of the BMP Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then plant a
erosive gullies have formed. ground cover and water until it is established. Provide lime and a one-
time fertilizer application.
Vegetation is too short or too Maintain vegetation at a height of approximately six inches.
long.
The inlet device The pipe is clogged. Unclog the pipe. Dispose of the sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged.
Erosion is occurring in the Regrade the swale if necessary to smooth it over and provide erosion
swale. control devices such as reinforced turf matting or riprap to avoid future
problems with erosion.
Stone verge is clogged or Remove sediment and replace with clean stone.
covered in sediment(if
applicable).
The forebay Sediment has accumulated to Search for the source of the sediment and remedy the problem if
a depth greater than the possible. Remove the sediment and dispose of it in a location where it
original design depth for will not cause impacts to streams or the BMP.
sediment storage.
Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or
riprap if needed to prevent future erosion problems.
Weeds are present. Remove the weeds, preferably by hand. If pesticide is used,wipe it on
the plants rather than spraying.
The vegetated shelf Best professional practices Prune according to best professional practices
show that pruning is needed
to maintain optimal plant
health.
Plants are dead, diseased or Determine the source of the problem: soils, hydrology, disease, etc.
dying. Remedy the problem and replace plants. Provide a one-time fertilizer
application to establish the ground cover if a soil test indicates it is
necessary.
Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on
the plants rather than spraying.
STORM-EZ 9/4/2018
Version 1.4 O&M Manual Page 3 of 5

Wet Detention Pond Maintenance Requirements (Continued)
The main treatment area Sediment has accumulated to Search for the source of the sediment and remedy the problem if
a depth greater than the possible. Remove the sediment and dispose of it in a location where it
original design sediment will not cause impacts to streams or the BMP.
storage depth.
Algal growth covers over 50% Consult a professional to remove and control the algal growth.
of the area.
Cattails, phragmites or other Remove the plants by wiping them with pesticide (do not spray).
invasive plants cover 50% of
the basin surface.
The embankment Shrubs have started to grow Remove shrubs immediately.
on the embankment.
Evidence of muskrat or Use traps to remove muskrats and consult a professional to remove
beaver activity is present. beavers.
A tree has started to grow on Consult a dam safety specialist to remove the tree.
the embankment.
An annual inspection by an Make all needed repairs.
appropriate professional
shows that the embankment
needs repair. (if applicable)
The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site.
The outlet device is damaged Repair or replace the outlet device.
The receiving water Erosion or other signs of Contact the local NC Department of Environment and Natural
damage have occurred at the Resources Regional Office.
'outlet.
The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not
readily penetrate into accumulated sediments.
STORM-EZ 9/4/2018
Version 1.4 O&M Manual Page 4 of 5

Wet Detention Pond Design Summary
Wet Pond Diagram
WET POND ID FOREBAY MAIN POND
221 Permanent Pool El. 91.5 Permanent Pool El. 91.5
Temporary Pool El: 93.1 Temporary Pool El: 93.1
Pretreatment other No Clean Out Depth: 3 Clean Out Depth: 3
than forebay? Sediment Removal El: 88.5 Sediment Removal El: 88.5
Has Veg. Filter? Yes Bottom Elevation: 88 Bottom Elevation: 88
WET POND ID FOREBAY MAIN POND
222 Permanent Pool El. 91 Permanent Pool El. 91
Temporary Pool El: 92.2 Temporary Pool El: 92.2
Pretreatment other No Clean Out Depth: 5 Clean Out Depth: 5
than forebay? Sediment Removal El: 86 Sediment Removal El: 86
Has Veg. Filter? Yes Bottom Elevation: 85.5 Bottom Elevation: 85.5
STORM-EZ 9/5/2018
Version 1.4 O&M Manual Page 5 of 5

Dominion Energy Services,Inc. gr. Dominion
5000 DominionBoulevard
Glen Allen,VA 23060 0.0 Energy
ne rg V
DominionEnergy.com
Attachment#2
SuppEZ Form