20170149 Ver 3_DEQ Review Request_20201120

November 6, 2020
Ms. Sue Homewood
Division of Water Resources
Winston Salem Regional Office
DEQ 450 W. Hanes Mill Rd., Suite 300
Winston Salem, North Carolina 27105
Re: CONVEYANCE PERMIT APPLICATION
RAW WATER INTAKE AND CONVEYANCE
DUKE ENERGY MARSHALL STEAM STATION
LAKE NORMAN, CATAWBA COUNTY, NC
Dear Ms. Homewood,
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. This package has been submitted to the USACE to request a modification to the permit at
Marshall Plant, MAR-145. We are submitting this to DEQ to request modification to the Individual 401
Water Quality Certification WQC004172, under action number DWR-20170149 v2.
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 or concurrence with this such that this request can finalize the request
for a Modification to an Army Corps of Engineers Individual Permit at the Marshall Plant for these
activities. 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,
Y/
Ghazoll Motlagh, PE, CFM
Senior Water Resources Engineer
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.woodplc.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

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 • • •

PROJECT LOCATION ,
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woo � DUKE WATER INTAKE AND CONVEYANCE 7779140003
REVISION NO.:
LAKE NORMAN p
2801 Yorktown Road, Ste 100 Tel. [phone] ENERGY® TERRELL, NORTH CAROLINA DATE:
Charlotte, NC 28208 www.woodplc.com 2020
PROJECTION / DATUM: PREPARED BY: TITLE FIGURE NO.:
NC83F DNP
CHECKED BY: GM SITE LOCATION MAP
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1 INCH:1 MILE REVIEWED BY: - I
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Catawba-Wateree Shoreline Classification
Public Infrastructure
Residential
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Commercial Marina
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If DUKE
PROJECT
DUKE ENERGY
RAW WATER INTAKE AND CONVEYANCE
PROJECT NO.:
7812200482
REVISION NO.:
LAKE
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2801 Yorkmont Road, Ste 100 Tel. [phone]
�, ENERGY®
CA
TERRELL, NORTHRTH CAROLINA
DATE:
Charlotte, NC 28208 www.woodplc.com
2020
PROJECTION / DATUM:
PREPARED BY:
TITLE
FIGURE NO.:
NC-83F
DNP
2016 CATAWBA - WATEREE SHORELINE
CLASSIFICATION
0 300' 600'
CHECKED BY:
GM
REVIEWED BY:
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SCALE: 1" = 600'

N: 681,235.64
F• 1 Al R ?Q7 ?R
NOTES:
1. COORDINATES ARE BASED ON HORIZONTAL DATUM: NORTH CAROLINA '
STATE PLANES, NORTH AMERICAN DATUM OF 1983 (NAD83).
2. THIS DRAWING IS THE PRODUCT OF MERGING TWO DIGITAL SURVEY
FILES. THE LANDWARD TOPOGRAPHICAL SURVEY IS PART OF A LARGER
- - - - LIDAR—BASED SURVEY OF THE MARSHALL STEAM STATION AND
PROVIDED TO ARCADIS BY DUKE ENERGY. THE EXTENT OF THE LIDAR
oooo
SURVEY IS GENERALLY ALONG THE 760 CONTOUR. A BATHYMETRIC
SURVEY OF THE ADJACENT AREA OF LAKE NORMAN WAS PERFORMED
w s s s s BY WOOD ENVIRONMENTAL AND INFRASTRUCTURE SOLUTION, INC. IN
JUNE 2020. USING THE SAME DATUM AND COORDINATE SYSTEM, THE
DIGITAL FILES OF BOTH SURVEYS WERE ADJOINED TO CREATE THIS
0000o FIGURE.
oomda 3. THE COORDINATES DEPICTED FOR PROPOSED INFRASTRUCTURE ARE FOR
"101 THE PURPOSE OF THE CONVEYANCE PERMIT APPLICATION. COORDINATES
',, T'11 OF FUTURE AS —BUILT FEATURES MAY BE DIFFERENT THAN THOSE
q6 o Q DEPICTED IN THIS FIGURE.
4. PROPOSED PROJECT INFRASTRUCTURE LANDWARD OF THE FERC
soot PROJECT BOUNDARY IS NOT DEPICTED ON THIS FIGURE.
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SCALE: 1 " = 50'
PROPOSED INTAKE
N:681,100.98
E:1,418,370.50
PROPOSED PROJECT
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'DUKE
ENERGY
CAROLINAS
PROPOSED INTAKE
N: 680,977.50
E:1, 418, 442.22
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1
1
OWNER: DUKE ENERGY CAROLINAS LLC
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PROPOSED PROJECT INFRASTRUCTURE
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1
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PROPOSED INTAKE PIPE r4
AIRBURST SUPPLY PIPE ~
SEE PROFILES ON FIG 2 ~ -
AND FIG 2 "
0
r" n
' ESTIMATED EASEMENT BOUNDARY
APPROXIMATE EXTENT OF OUTER TURBIDITY CURTAIN.
DEPTH OF CURTAIN TO LAKEBED. TYPE 1 CURTAIN.
_ APPROXIMATE EXTENT OF INNER TURBIDITY CURTAIN,
DEPTH OF CURTAIN TO LAKEBED. TYPE 3 CURTAIN.
PROPOSED INTAK
AIRBURST SUPPL
N:681,100.98
E:1,418.370.50
— PROPOSED PROJECT
AREA - 0.2213 ACRES
E PIPE
Y PIPE
1`
PROPOSED INTAKE SCREENS (2)
N: 860,977.50
E= 1.415,442,22
NOT FOR CONSTRUCTION
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DUKE ENERGY BUSINESS SERVICES, LLC - MARSHALL STEAM STATION • TERRELL, NORTH CAROLINA
ARCADIS Project No.
L>esign&Donsuttancy
DYNAMIC GROUNDWATER RECIRCULATION PILOT SYSTEM DESIGN
77
SCALE(S) AS INDICATED
professional Engineers No.
ARCADIS
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JULY2020
FIG 1
sage Date signed Project Mgr.
ARCADIS G&M
THIS BAR USE TO VERIFY
5420 WADE PARK BLVD
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No.
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ARCADIS G&M OF NORTH CAROLINA,
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ORIGINAL DRAWING: SCALE
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ARCADIS Project No.
0 5'
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DYNAMIC GROUNDWATER RECIRCULATION PILOT SYSTEM DESIGN
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40'
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JULY2020
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Designed by
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Checked by
INCH ON THE REPRODUCTION
INC.
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ORIGINAL DRAWING:
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EXPRESS WRITTEN PERMISSION OF SAME.
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Professional Engineers Name
DUKE ENERGY BUSINESS SERVICES, LLC - MARSHALL STEAM STATION • TERRELL, NORTH CAROLINA
ARCADIS Project No.
D�esign&Consultancy
DYNAMIC GROUNDWATER RECIRCULATION PILOT SYSTEM DESIGN
30043377
Professional Engineer's No.
Date
IVrnaturatand
ARCADIS
0 10 20 40
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ARCADIS G&M OF NORTH CAROLINA,
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FIG 3
state
Date signed Project
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No.
Date
Revisions
By
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THIS DRAWING IS THE PROPERTY OF THE ARCADIS ENTITY IDENTIFIED IN THE TITLE BLOCK
AND MAY NOT BE REUSED OR ALTERED IN WHOLE OR IN PART WITHOUT THE
Designed by
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CIVIL
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EXPRESS WRITTEN PERMISSION OF SAME.
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L
760 ---- ------ =m= --------
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SCREEN ARRAY DETAIL - PROFILE LOOKING LANDWARD
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EXAGGERATED VIEW. SCREEN MANIFOLD PIPING WILL BE SUPPORTED
CONCRETE CAP OR BLOCK PARTIALLY
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Professional Engineers Name
DUKE ENERGY BUSINESS SERVICES, LLC - MARSHALL STEAM STATION • TERRELL, NORTH CAROLINA
ARCADIS Project Nu.
sign&Consultancy
DYNAMIC GROUNDWATER RECIRCULATION PILOT SYSTEM DESIGN
30043377
Professional Engineers No.
Date
SCALE(S) AS INDICATED
i0fnatUf818nf1
/aRCJaDIS
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ARCADIS G&M OF NORTH CAROLINA,
DETAILS
JULY 2020
FIG 4
State
Dale Signed
Project Mgr.
ARCADIS G&M
5420 WADE PARK BLVD
SUITE 350
THIS BAR USE TO VERIFY
REPRESENTS ONE I FIGURE
No.
Date
Revisions
By
Ckd
THIS DRAWING IS THE PROPERTYOF THE ARCADIS ENTITY IDENTIFIED IN THE TITLE BLOCK
Designed by
Drawn by
Cracked by
INCH ON THE REPRODUCTION
INC..
LEIGH, NC 27607
ORIGINAL DRAWING: SCALE
ALTERED IN WHOLE OR IN PART WITHOUT THE
AND MAY NOT BE REUSED OR AL
EXPRESS WRITTEN PERMISSION OF SAME.
CIVIL
TEL. [phone]