20170149 Ver 3_Pre-Filing Meeting Request_20201005

ID#* 20170149
Version* 3
Regional Office* Winston-Salem Regional Office - [phone]
Reviewer List* Sue Homewood
Pre -Filing Meeting Request submitted 10/5/2020
Contact Name * Richard Harmon
Contact Email Address* [e-mail]
Project Name* Raw Water Intake and Conveyance Duke Energy Marshall Steam Station
Project Owner* Duke Energy Carolinas, LLC
Project County* Catawba
Owner Address: Street Address
526 South Church Street,
Address Line 2
mail Code 13k
aty State / Frovince / Region
Charlotte North Carolina
Rbstal/Zip Code Country
28202 USA
Is this a transportation project? * r Yes r No
Type(s) of approval sought from the DWR:
r- 401 Water Quality Certification - F 401 Water Quality Certification -
Regular Express
W Individual Permit W Modification
r- Shoreline Stabilization
Does this project have an existing project ID#?*
r Yes r No
Please list all existing project ID's associated with this projects.*
DWR # 20170149 v2
Do you know the name of the staff member you would like to request a meeting with?
Sue Homewood
Please give a brief project description below.*

Duke Energy at the Marshall Steam Station is proposing to install a raw
water intake, conveyance pipe, and airburst supply piping at the Marshall
Steam Plant located at 8320 NC-150 in Sherrills Ford, Catawba County,
North Carolina on Lake Norman. The proposed project is located on Duke
Energy properties, with the surrounding shoreline classified as public
infrastructures according to Duke Energy - Catawba-Wateree Federal
Energy Regulatory Commission (FERC) Shoreline Management Plan
(SMP). The 12-inch diameter high -density polyethylene water conveyance
pipe and intake screens are part of the groundwater remediation program
at the Marshall Steam Station.
The groundwater remediation program consists of groundwater extraction
and clean water infiltration. The new intake is designed to accommodate
the flows for the infiltration system as well as to provide water for dust
suppression at the facility that will be necessary during additional remedial
activities. The water for dust control will be used on haul roads, in ash
removal activities, in soil borrow areas and in the landfill construction and
operation activities. For the water used within the ash basin and landfill it
ultimately, if not absorbed, would go to a NPDES permitted system. For
other areas of the project there will not be any run-off from the dust control
operation going offsite. NPDES permit NC0004987 is being modified to
allow for groundwater that is being pumped from the extraction wells for
remediation to be discharged to an on -site wastewater treatment system
prior to discharging from NPDES permitted outfall 002.
To eliminate surface (land and lakebed) disturbance and to facilitate the
distance and depth of the intake screen array's targeted location in the
Lake, the piping will be installed via horizontal directional drill (HDD). The
HDD bore will require an excavated shallow "bore launch" pit roughly 8ft x
8ft x 4ft in which to launch and control the borehead, resulting in
approximately 10 cubic yard of excavation at the pit. The pit will be
backfilled with approximately 10 cubic yard of NCDOT No. 57 stone to
match surrounding and pre -construction lakebed slope and elevation.
Please give a couple of dates you are available for a meeting.
11 /5/2020
Please attach the documentation you would like to have the meeting about.
Marshall Plant Water Intake USACE Review
8.98MB
Request 09232020 final_.pdf
pdf only
By digitally signing below, I certify that I have read and understood that per the Federal Clean Water Act Section
401 Certification Rule the following statements:
• This form completes the requirement of the Pre -Filing Meeting Request in the Clean Water Act Section 401 Certification
Rule.
• I understand by signing this form that I cannot submit my application until 30 calendar days after this pre -filing
meeting request.
• I also understand that DWR is not required to respond or grant the meeting request.
Your project's thirty -day clock started upon receipt of this application. You will receive notification regarding meeting location
and time if a meeting is necessary. You will receive notification when the thirty -day clock has expired, and you can submit an
application.
Signature
c/lfr9�lL'f�� � �lX�d
Submittal Date 10/5/2020

September 23, 2020
Mr. Bryan Roden -Reynolds
US Army Corps of Engineers
Asheville Regulatory Field Office
151 Patton Avenue, Room 208
Asheville, North Carolina 28801
Re: CONVEYANCE PERMIT APPLICATION
RAW WATER INTAKE AND CONVEYANCE
DUKE ENERGY MARSHALL STEAM STATION
LAKE NORMAN, CATAWBA COUNTY, NC
Dear Mr. Roden -Reynolds,
wood.
Wood PLC
2801 Yorkmont Road
Suite 100
Charlotte, North Carolina 28208
www.woodplc.com
On behalf of Duke Energy at the Marshall Steam Station, Wood Environment & Infrastructure Solutions
(Wood) respectively requests the review of a proposed project at Lake Norman in Catawba County, which
is managed by Duke Energy Lake Services. As part of the Lake Services Conveyance Permit Application
process, federal, state, regional and local agencies and organizations require notification for review and
consultation.
The Conveyance Permit Application approval process will allow for a raw water intake and conveyance
pipe to be installed within the Federal Energy Regulatory Commission (FERC) boundary of Lake Norman.
Attached is an executive summary of this project for your review.
Please provide written comments within 30 days of receipt of this letter. Agency comments will be
forwarded to Lake Services as part of the Conveyance Permit Application.
If you have any questions or require additional information, please do not hesitate to contact me at
[phone], or at [e-mail].
Sincerely,
6 �4*/_)
Ghazoll Motlagh, PE, CFM
Senior Water Resources Engineer
cc: Scott Jones
Attachments: Executive Summary
'Wood' is a trading name for John Wood Group PLC and its subsidiaries

September 10, 2020
Chad Broadway
Lake Services Representative
Duke Energy Lake Services
526 S. Church Street
Charlotte, NC 28202
Re: STEP 1 — EXECUTIVE SUMMARY
CONVEYANCE PERMIT APPLICATION
RAW WATER INTAKE AND CONVEYANCE
DUKE ENERGY MARSHALL STEAM STATION
LAKE NORMAN, CATAWBA COUNTY, NC
Dear Mr. Broadway,
wood.
Wood PLC
2801 Yorkmont Road
Suite 100
Charlotte, North Carolina 28208
www.woodpic.com
On behalf of Duke Energy at the Marshall Steam Station, Wood Environment & Infrastructure Solutions
(Wood) intends to submit a Conveyance Permit Application for a less than 1 million gallons per day
(MGD) Raw Water Intake at Lake Norman. For Step 1 of the application process , we are providing the
executive summary below along with maps detailing the configuration and location of the proposed
project.
Executive Summary
Duke Energy at the Marshall Steam Station is proposing to install a raw water intake, conveyance pipe,
and airburst supply piping at the Marshall Steam Plant located at 8320 NC-150 in Sherrills Ford, Catawba
County, North Carolina on Lake Norman. The proposed project is located on Duke Energy properties, with
the surrounding shoreline classified as public infrastructures according to Duke Energy - Catawba-
Wateree Federal Energy Regulatory Commission (FERC) Shoreline Management Plan (SMP). The 12-inch
diameter high -density polyethylene water conveyance pipe and intake screens are part of the
groundwater remediation program at the Marshall Steam Station. For additional detail of the project
location and shoreline classification, please refer to attached Site Location and Catawba-Wateree
Shoreline Classification Maps.
The groundwater remediation program consists of groundwater extraction and clean water infiltration.
The new intake is designed to accommodate the flows for the infiltration system as well as to provide
water for dust suppression at the facility that will be necessary during additional remedial activities. The
water for dust control will be used on haul roads, in ash removal activities, in soil borrow areas and in the
landfill construction and operation activities. For the water used within the ash basin and landfill it
ultimately, if not absorbed, would go to a NPDES permitted system. For other areas of the project there
will not be any run-off from the dust control operation going offsite. NPDES permit NC0004987 is being
modified to allow for groundwater that is being pumped from the extraction wells for remediation to be
discharged to an on -site wastewater treatment system prior to discharging from NPDES permitted outfall
002.
To eliminate surface (land and lakebed) disturbance and to facilitate the distance and depth of the intake
screen array's targeted location in the Lake, the piping will be installed via horizontal directional drill
(HDD). The HDD bore will require an excavated shallow "bore launch" pit roughly 8ft x 8ft x 4ft in which
'Wood' is a trading name for John Wood Group PLC and its subsidiaries •

Duke Energy — Marshall Steam Station — Lake Norman Raw Water Intake Application
to launch and control the borehead, resulting in approximately 10 cubic yard of excavation at the pit. The
pit will be backfilled with approximately 10 cubic yard of NCDOT No. 57 stone to match surrounding and
pre -construction lakebed slope and elevation.
The water conveyance pipe and the two air supply pipes are approximately 284 linear feet long from the
FERC Project Boundary elevation of 760 to the screen array with varying elevations as a function of the
rounded installation of the pipe through the HDD method. The use of HDD allows the pipe to maintain
the required cover of greater than 2 ft along the entire length of pipe, in compliance with the Catawba-
Wateree SMP. In accordance with the requirements for submarine utility line in the Shoreline
Management Guidelines, the pipe will be laid roughly 15 feet below the lakebed and will not require
anchoring. There will be no fill added to the lakebed, in the form of pipe or anchoring.
The short (approximately 8 feet) length of pipe that will be exposed at the screen will not require
anchoring. The two redundant cylindrical passive wedge wire intake screens are each 16-inches in
diameter and approximately 45-inches in length. The material of construction for the screens is a
proprietary mussel -resistant alloy by the screen manufacturer, Johnson Screens (Agseptence Group),
which is an NSF-61 certified for drinking water use. The mesh size is 2 millimeters, and the through -
screen velocity for each screen at the total intake withdrawal design flow is 0.25 feet per second. As both
screens will normally be in concurrent operation, the actual through -screen velocity will be approximately
one-half the design velocity.
The Duke boat ramp and docks located nearby are controlled by Duke Energy for operations. Boats will
not be anchoring or used recreationally, nor interfering within the project boundary limits. To ensure
boating safety in the vicinity of the project during and after construction activity, refer to Standard
Operating Procedure Number ESFP-AD-0101 by Duke for safe boating. The Lake Norman Boat Safety Plan
will be provided along with the conveyance application.
The design daily total withdrawal for the proposed water intake and conveyance pipe from Lake Norman
will not exceed 0.950 MGD, approximately 660 gallons per minute (GPM). The aggregate flow to the
infiltration wells is estimated to be approximately 0.4 MGD at a rate of 285 GPM, with the remaining
withdrawal being used for dust suppression activities associated with the ash basin closure. The proposed
average annual water withdrawal rate is 347 million gallons per year (MGY), averaging 29 million gallons
per month (MGM). Please refer to the attached Site Plan and Survey for an overview of the proposed
activity, location, and project limits. Additional information will be provided in the subsequent permit
application submission.
If you have any questions or require additional information, please do not hesitate to contact me at
[phone], or at [e-mail].
Sincerely,
Wood Environment & Infrastructure Solutions, Inc.
Ghazoll Motlagh, PE, CFM
Senior Water Resources Engineer
'Wood' is a trading name for John Wood Group PLC and its subsidiaries 0 0

Duke Energy — Marshall Steam Station — Lake Norman Raw Water Intake Application
Attachments: Site Location Map
2016 Catawba — Wateree Shoreline Classification
Survey
Site Plan
Profile and Detail Sheets
'Wood' is a trading name for John Wood Group PLC and its subsidiaries • •

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