20160117 Ver 1_401 Application_20160216

(� DUKE
ENERGY
February 5, 2016
Sheri Montalvo
1617 Mail Service Center
Raleigh NC 27699-1617
J
FEB 0 8 2016
RE: Duke Energy Progress, LLC.
Marshall Steam Station
Pre -Construction Notification —Temporary Coffer Dam
Dear Mrs. Montalvo:
Environmental Services
Duke Energy
EC13K\ 526 South Church St
Charlotte, NC 28202
Duke Energy Progress, LLC. is proposing to install a temporary coffer dam in an effort to bulkhead and
grout the existing outfall structure of the ash basin. This work is being conducted in conjunction with
installation of a new spillway outlet for the primary ash basin.
See more detailed description of the project in "Attachment A" in this package but the total linear feet
of this is approximately 45 ft.
Thank you for your assistance with this project. If you have any questions or comments regarding this
letter please contact me at [phone].
Sin
cerel ,
Brad LoveIan
Duke Energy
CCP — Permitting and Compliance
Environmental Health and Safety Department

2 0 1 60 1 17
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r --"---"---- Corps action ID no
o DWQ project no
Form Version 1
►� n
Page 1 of 10
PCN Form — Version 1.4 January 2009
Pre -Construction Notification (PCN) FormFEB 0U 'll
A.
Applicant Information
1.
Processing 401AgERP M TT NG
1 a. Type(s) of approval sought from the Corps
❑X Section 404 Permit ❑ Section 10 Permit
1b Specify Nationwide Permit (NWP) number: 33 or General Permit (GP) number.
1c
Has the NWP or GP number been verified by the Corps?
❑X Yes ❑ No
1d
Type(s) of approval sought from the DWQ (check all that apply) -
401 Water Quality Certification — Regular ❑ Non -404 Jurisdictional General Permit
❑ 401 Water Quality Certification — Express ❑ Riparian Buffer Authorization
1 e
Is this notification solely for the record
because written approval is not required?
For the record only for DWQ
401 Certification
❑ Yes ❑X No
For the record only for Corps Permit
❑ Yes ❑X No
1f
Is payment into a mitigation bank or in -lieu fee program proposed for
mitigation of impacts? If so, attach the acceptance letter from mitigation bank
or in -lieu fee program.
❑ Yes ❑X No
1g
Is the project located in any of NC's twenty coastal counties If yes, answer 1h
below.
❑ Yes ❑X No
1h. Is the project located within a NC DCM Area of Environmental Concern (AEC)?
❑ Yes ❑X No
2.
Project Information
2a
Name of project-
Marshall Steam Station Principal Spillway Replacement
2b
County,
Catawba
2c
Nearest municipality / town
Shernlls Ford
2d.
Subdivision name:
2e
NCDOT only, T I P or state protect no.
3.
Owner Information
3a. Name(s) on Recorded Deed.
Duke Energy Carolinas, LLC
3b
Deed Book and Page No
Book 2840, Page 338
3c
Responsible Party (for LLC if
applicable)
Duke Energy Carolinas, LLC
3d
Street address
8320 East NC 150 Hwy
3e
City, state, zip
Shernlls Ford, NC28673
3f
Telephone no
3g
Fax no.*
3h. Email address:
Page 1 of 10
PCN Form — Version 1.4 January 2009

4.
Applicant Information (if different from owner)
4a
Applicant is-
❑ Agent ❑X Other, specify Duke Energy Employee
4b
Name
Brad Loveland
4c
Business name
(if applicable)
Duke Energy
4d.
Street address:
526 South Church Street, EC13K
4e
City, state, zip,
Charlotte, NC 28202
4f
Telephone no..
980-373-2820
4g
Fax no:
4h
Email address*
brad [e-mail]
S.
Agent/Consultant Information (if applicable)
5a
Name.
5b
Business name
(if applicable)
5c.
Street address*
5d
City, state, zip.
5e
Telephone no
5f
Fax no.:
5g. Email address:
Page 2 of 10

B. Project Information and Prior Project History
1. Property Identification
1a Property identification no (tax PIN or parcel ID)
461803426350 and 461603149641
1 b Site coordinates (in decimal degrees)
Latitude 35 60631561 Longitude 80 95967865
1c Property size
acres
2. Surface Waters
2a Name of nearest body of water to proposed project
Lake Norman
2b. Water Quality Classification of nearest receiving water.
WS -IV, Critical Area
2c River basin.
Catawba
3. Project Description
3a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application
The protect site includes the existing active ash basin and primary discharge structure, the ash basin dam, and the Federal Energy Regulatory
Commission (FERC) Project Boundary of Lake Norman General land use in the vicinity of the protect includes the Marshall Steam Station,
residential development, agricultural areas, and Lake Norman
3b List the total estimated acreage of all existing wetlands on the property 9 41
3c List the total estimated linear feet of all existing streams (Intermittent and perennial) on the property 11231
3d. Explain the purpose of the proposed project
The purpose of the proposed protect is to address potential ash basin dam safety concerns by constructing a new spillway structure
3e Describe the overall project in detail, including the type of equipment to be used
4. Jurisdictional Determinations
4a Have jurisdictional wetland or stream determinations by the
Corps or State been requested or obtained for this property /
project (includingall prior phases)in the past?
❑X Yes ❑ No ❑ Unknown
Comments
4b If the Corps made the jurisdictional determination, what type
of determination was made?
❑ Preliminary ❑ Final
4c If yes, who delineated the jurisdictional areas?
Name (if known) Amec Foster Wheeler
Agency/Consultant Company Amec Foster Wheeler
Other
4d If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation
Field reviews by Corps personnel for jurisdictional determination were conducted on 11/3/2015
5. Project History
5a Have permits or certifications been requested or obtained for
this project (including all prior phases) in the past?
El Yes ❑X No ❑ Unknown
5b If yes, explain in detail according to "help file" instructions
6. Future Project Plans
6a Is this a phased project?
❑ Yes ❑X No
6b. If yes, explain
Page 3 of 10
PCN Form — Version 1 4 January 2009

C. Proposed Impacts Inventory
1. Impacts Summary
1a Which sections were completed below for your project (check all that apply)
❑ Wetlands ❑ Streams —tributaries ❑ Buffers ❑X Open Waters ❑ Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted
2a
Wetland impact
number
Permanent (P) or
Temporary
2b
Type of impact
2c
Type of wetland
2d
Forested
2e
Type of jurisdiction
Corps (404,10) or
DWQ (401, other)
2f
Area of
impact
(acres)
W1
Choose one
Choose one
Yes/No
W2
Choose one
Choose one
Yes/No
W3
Choose one
Choose one
Yes/No
W4
Choose one
Choose one
Yes/No
W5
Choose one
Choose one
Yes/No
W6
Choose one
Choose one
Yes/No
2g Total Wetland Impacts:
2h Comments
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this
question for all stream sites impacted
3a
Stream impact
number
Permanent (P) or
Temporary (T)
3b
Type of impact
3c
Stream name
3d
Perennial (PER) or
intermittent (INT)?
3e.
Type of
jurisdiction
3f.
Average
stream
width
(feet)
3g
Impact
length
(linear
feet)'
S1
Choose one
S2
Choose one
S3
Choose one
S4
Choose one
S5
Choose one
S6
Choose one
3h Total stream and tributary impacts
3i Comments
Page 4 of 10
PCN Form — Version 1 4 January 2009

4. Open Water Impacts
If there are proposed impacts to lakes, ponds, estuaries, tributaries, sounds, the Atlantic Ocean, or any other open water of
the U S. then individually list all open water impacts below.
4a
Open water
impact number
Permanent (P) or
Temporary T
4b
Name of waterbody
(if applicable)
4c
Type of impact
4d
Waterbody
type
4e
Area of impact (acres)
01 T
Lake Norman
Fill
Lake
003
02
Choose one
Choose
03
Choose one
Choose
04
Choose one
Choose
4f. Total open water impacts
4g. Comments. Impacts include temporary fill for the construction of a coffer dam Proposed impacts will include up to 500 cubic yards of material
for coffer dam construction Proposed materials include various sizes of stone and poly sheeting for flow prevention
5. Pond or Lake Construction
If pond or lake construction proposed, the complete the chart below.
5a
Pond ID number
5b.
Proposed use or
purpose of pond
5c
Wetland Impacts (acres)
5d
Stream Impacts (feet)
5e
Upland
(acres)
Flooded
Filled
Excavated
Flooded
Filled
Excavated
P1
Choose one
P2
Choose one
5f. Total:
5g Comments
5h Is a dam high hazard permit required?
❑ Yes ❑ No If yes, permit ID no
51 Expected pond surface area (acres)
5j Size of pond watershed (acres)
5k Method of construction.
6. Buffer Impacts (for DWQ)
If project will impact a protected riparian buffer, then complete the chart below If yes, then Individually list all buffer impacts
below. If any impacts require mitigation. then vou MUST fill out Section D of this form
6a. Project is in which protected basin?
❑ Neuse ❑ Tar -Pamlico ❑ Catawba ❑ Randleman ❑ Other
6b
Buffer Impact
number—
Permanent (P) or
Temporary T
6c
Reason for Impact
6d
Stream name
6e
Buffer
mitigation
required?
6f
Zone 1
impact
(square
feet)
6g
Zone 2
impact
(square
feet
B1
Yes/No
B2
Yes/No
B3
Yes/No
B4
Yes/No
B5
Yes/No
B6
Yes/No
6h Total Buffer Impacts:
61. Comments
Page 5of10

D. Impact Justification and Mitigation
1. Avoidance and Minimization
1a Specifically describe measures taken to avoid or minimize the proposed Impacts in designing project
The proposed impacts are temporary fill for construction of a coffer dam The proposed coffer dam is anticipated to be in place for up to four weeks
of duration
1b Specifically describe measures taken to avoid or minimize the proposed Impacts through construction techniques
Impacts to the open water habitat will be avoided during construction by traversing uplands to access the site with construction machinery, i e ,
access for construction equipment and materials will be provided via adjacent maintained roadways Silt fences and other sediment and erosion
control best management practices will be utilized to avoid impacts to wetlands and streams from erosion and sedimentation
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a Does the project require Compensatory Mitigation for
Impacts to Waters of the U S or Waters of the State?
❑ Yes ❑X No
2b If yes, mitigation is required by (check all that apply)
❑ DWQ ❑ Corps
2c If yes, which mitigation option will be used for this
prolect?
❑ Mitigation bank
❑ Payment to in -lieu feeprogram
y ,
❑ Permittee Responsible Mitigation
3. Complete if Using a Mitigation Bank
3a Name of Mitigation Bank
3b Credits Purchased (attach receipt and letter)
Type Choose one
Type Choose one
Type Choose one
Quantity
Quantity
Quantity
3c Comments
4. Complete if Making a Payment to In -lieu Fee Program
4a Approval letter from in -lieu fee program Is attached
❑ Yes
4b Stream mitigation requested
linear feet
4c If using stream mitigation, stream temperature
Choose one
4d Buffer mitigation requested (DWQ only)
square feet
4e Riparian wetland mitigation requested
acres
4f Non -riparian wetland mitigation requested
acres
4g Coastal (tidal) wetland mitigation requested-
acres
4h Comments
5. Complete if Using a Permittee Responsible Mitigation Plan
5a If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan
Page 6 of 10
PCN Form —Version 1 4 January 2009

6. Buffer Mitigation (State Regulated Riparian Buffer Rules) — required by DWQ
6a Will the project result in an impact within a protected riparian buffer that requires
buffer mitigation?
❑ Yes ❑ No
6b If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation Calculate the
amount of mitigation required
Zone
6c.
Reason for impact
6d
Total impact
(square feet)
Multiplier
6e
Required mitigation
(square feet)
Zone 1
3 (2 for Catawba)
Zone 2
1.5
6f Total buffer mitigation required:
6g If buffer mitigation is required, discuss what type of mitigation is proposed (e g , payment to private mitigation bank,
permittee responsible riparian buffer restoration, payment into an approved in -lieu fee fund)
6h Comments.
Page 7 of 10

E.
Stormwater Management and Diffuse Flow Plan (required by DWQ)
1.
Diffuse Flow Plan
1a
Does the project include or is it adjacent to protected riparian buffers identified
❑ Yes ❑ No
within one of the NC Riparian Buffer Protection Rules?
lb
If yes, then is a diffuse flow plan included? If no, explain why
❑ Yes ❑ No
2.
Stormwater Management Plan
2a
What is the overall percent imperviousness of this project?
0
2b.
Does this project require a Stormwater Management Plan?
❑ Yes ❑X No
2c
If this project DOES NOT require a Stormwater Management Plan, explain why.
This
protect does not include addhonal impervious surfaces or Stormwater discharges
2d
If this project DOES require a Stormwater Management Plan, then provide a brief, narrative description of the plan
2e
Who will be responsible for the review of the Stormwater Management Plan?
3.
Certified Local Government Stormwater Review
3a
In which localgovernment's jurisdiction is this project?
❑ Phase II
❑ NSW
3b
Which of the following locally -implemented stormwater management programs
❑ USMP
apply (check all that apply)
❑ Water Supply Watershed
❑ Other
3c
Has the approved Stormwater Management Plan with proof of approval been
❑ Yes ❑ No
attached?
4.
DWQ Stormwater Program Review
❑Coastal counties
❑HQW
4a
Which of the following state -implemented stormwater management programs apply
❑ORW
(check all that apply)
E] Session Law 2006-246
❑Other
4b
Has the approved Stormwater Management Plan with proof of approval been
❑ Yes ❑ No
attached
5.
DWQ 401 Unit Stormwater Review
5a
Does the Stormwater Management Plan meet the appropriate requirements?
❑ Yes ❑ No
5b
Have all of the 401 Unit submittal requirements been met?
❑ Yes ❑ No
Page 8 of 10
PCN Form — Version 1 4 January 2009

F.
Supplementary Information
1.
Environmental Documentation (DWQ Requirement)
la
Does the project involve an expenditure of public (federal/state/local) funds or the
❑ Yes
❑X No
use of public (federal/state) land?
1 b
If you answered "yes' to the above, does the project require preparation of an
environmental document pursuant to the requirements of the National or State
❑ Yes
❑ No
(North Carolina) Environmental Policy Act (NEPA/SEPA)?
1 c
If you answered "yes' to the above, has the document review been finalized by the
State Clearing House? (If so, attach a copy of the NEPA or SEPA final approval
letter )
❑ Yes
❑ No
Comments:
2.
Violations (DWQ Requirement)
2a
Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H 1300), DWQ Surface Water or Wetland Standards,
E] Yes
Z No
or Riparian Buffer Rules (15A NCAC 2B 0200)?
2b
Is this an after -the -fact permit application?
❑Yes
N No
2c.
If you answered "yes" to one or both of the above questions,- provide an explanation of the violation(s):
3.
Cumulative Impacts (DWQ Requirement)
3a
Will this project (based on past and reasonably anticipated future impacts) result in
El Yes
Q No
additional development, which could impact nearby downstream water quality?
3b
If you answered "yes' to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with the
most recent DWQ policy If you answered "no," provide a short narrative description
4.
Sewage Disposal (DWQ Requirement)
4a
Clearly detail the ultimate treatment methods and disposition (non -discharge or discharge) of wastewater generated from
the proposed project, or available capacity of the subject facility
The proposed project will not generate wastewater
Page 9 of 10
PCN Form — Version 1.4 January 2009

5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a WIII this project occur in or near an area with federally protected species or
x YesNo
❑ ❑
habitat?
5b Have you checked with the USFWS concerning Endangered Species Act
❑x Yes ❑ No
impacts?
5c If yes, indicate the USFWS Field Office you have contacted
Asheville
5d What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical
Habitat?
USFWS Information, Planning, and Conservation System (IPaC) interactive website and NCNHP database Lake Norman provides perching and
foraginq habitat for bald eaqles The project will not impact forested habitat used by eaqles
6. Essential Fish Habitat (Corps Requirement)
6a Will this project occur in or near an area designated as essential fish habitat?
❑ Yes ❑x No
6b What data sources did you use to determine whether your site would impact Essential Fish Habitat?
http //ocean flondamanne org/efh_coral/viewer him NOAA NMFS online interactive software "Essential Fish Habitat Mapper Q 0"
7. Historic or Prehistoric Cultural Resources (Corps Requirement)
7a Will this project occur in or near an area that the state, federal or tribal
governments have designated as having historic or cultural preservation
❑ Yes ❑x No
status (e.g , National Historic Trust designation or properties significant in
North Carolina history and archaeology)?
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?
Previously conducted culture resource reviews and the NC Dept of Cultural Resources, State Historic Preservation Office (SHPO) interactive website
8. Flood Zone Designation (Corps Requirement)
8a Will this project occur in a FEMA -designated 100 -year floodplain?
❑x Yes ❑ No
8b If yes, explain how project meets FEMA requirements
This protect will not include the placement of permanent fill materials in the 100 -year floodplain Therefore, current FEMA flood elevations will not be
impacted
8c What source(s) did you use to make the floodplain determination?
NC Flood Maps FEMA Panel 4618 Flood data Effective 5 September 2007
Applicant/Agent's Printed Name
Date
Applicant/Agent's Signature
(Agent's signature is valid only if an authorization
letter from the applicant is provided
Page 10 of 10

Attachment A
Marshall Steam Station Principal Spillway Replacement — Project Overview
The proposed action will entail necessary maintenance at the existing Active Ash Basin primary
discharge structure along Lake Norman. The reason for this work is to address potential ash basin dam
safety concerns. Discharge from the Active Ash Basin is permitted by NC Department of Environmental
Quality (DEQ), formerly NC Department of Environment and Natural Resources, under NPDES Permit
NC0004987 and is identified as Outfall 002 on the permit.
The existing primary spillway includes a 42 -inch corrugated metal pipe (CMP) slip lined using a 30 -inch
HDPE pipe with a submerged discharge into Lake Norman. Available design drawings indicate that the
CMP was extended into Lake Norman in 1975. Duke Energy hired AECOM to evaluate the structural
integrity of the existing spillway riser as part of a fleet -wide initiative. The analysis identified deficiencies
in the spillway structure under seismic loading. To mitigate the potential risk of material spilling into
Lake Norman, a new spillway structure has been proposed and the existing spillway structure will be
abandoned. The proposed improvements will include the installation of a new spillway structure
constructed at the top face of the dam with the pipe outfall discharging water at the same discharge
location as the existing outfall. Once the new spillway is operational, the existing outlet structure and
discharge pipe will be grouted in place. The new spillway will be outside the Project Boundary. In order
to complete the pipe grouting, a temporary cofferdam must be built in the discharge channel to dewater
the work area. The area needed to complete this work is 0.071 acres. The dimensions of the work area
are 45 ft. x 80 ft. Impacts to open water habitat (i.e., Lake Norman) will be limited to temporary fill for
the construction of the cofferdam. The proposed materials will include various sizes of stone and poly
sheeting for flow prevention. Turbidity curtains will be placed around the temporary cofferdam. All work
is being performed to the west and behind the existing skimmer wall and therefore no impact to the
boating public is anticipated.
The proposed spillway outlet will discharge several feet upstream of the Project Boundary and is
designed to maintain the flow of water currently discharged from the existing spillway structure during
normal operations. The proposed outfall will comply with NPDES requirements and will discharge within
30 feet of the existing outfall.
After receipt of final permit(s), abandonment of the existing spillway structure and construction of the
new spillway structure will be initiated within seven days and all construction/abandonment work will
be completed within 120 days. The work to be performed consists of grouting the existing pipe on the
old spillway structure and construction of the associated temporary cofferdam and construction of the
new spillway structure. Best Management Practices will be used during the construction and removal of
the temporary cofferdam, as detailed in the design plan drawings. After removal of the temporary
cofferdam, lake contours will be re-established.

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