20140823 Ver 2_401 Application_20150615

(� DUKE
ENERGY
Ms. Karen Higgins
NCDENR, Division of Water Resources
401 and Buffer Permitting Unit
1617 Mail Service Center I
Raleigh, NC 27699 -1617
Subject: Duke Energy Carolinas, LLC
Buck Steam Station
Revised Permit Application - DWR # 14 -0823
Buck CTCC Raw Water Decoupling Project
Dear Ms. Higgins:
Environmental Services
Duke Energy
410 S Wilmington Street
Raleigh, NC 27601
Duke Energy Carolinas, LLC (DEC) has previously applied for and received
authorization under Nationwide Permit No. 16 (August 2014 DWR #14 -0823) to perform
maintenance dredging at the Buck Steam Station intake canal structure and boat ramp
in support of the raw water decoupling project.
DEP has revised some of the dredging estimates and made some other slight changes
to the permit application. DEC is submitting a revised application in support of the
project for your review. The major revision to the permit application is a change in the
estimated amount of material to be dredged. Previously, it was estimated that DEC
would dredge 10,000 cubic yards of material from around the intake structure and 25
cubic yards of material around the boat ramp. Those estimates have increased to
12,000 cubic yards at the intake structure and 300 cubic yards at the boat ramp. A
localized turbidity curtain may also be utilized at the barge and moved with the dredging
process. The changes to the original application are highlighted in yellow in the revised
application to help facilitate your review.
John Thomas with the Corps of Engineers has been made aware of the changes in the
permit application. He requested that we send him a revised narrative and a copy of the
revised drawings for the project for his file. He does not need to reissue the permit.
I spoke with Alan Johnson in the Mooresville Regional Office regarding the changes and
he requested that we re- submit the application for review. Thus, enclosed are five (5)
copies of a revised preconstruction notification and supporting drawings that provide
detail on the proposed work.
We would appreciate your quick review of this project. Please do not hesitate to contact
me at 919 - 546 -7457 or steve.cahoon(cDduke- energy.com if you have any questions.

Very truly. yours,
Steve Cahoon
Duke Energy EHS Department
EHS -CCP Permitting and Compliance
Enclosures
• Pre - construction Notification
• Map of site location
• Check

O'e'O�_ W A7- 9oq
o <
c�9a1
Office Use Only:
Corps action ID no.
DWQ project no.
AID Form Version 1.4 January 2009
n o-
Pre-Construction Notification (PCN) Form
A. Applicant Information
1. Processing
1 a. Type(s) of approval sought from the Corps:
Q Section 404 Permit ❑ Section 10 Permit
1 b. Specify Nationwide Permit (NWP) number: 16 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):
Q 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 0 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 Q No
1g. Is the project located in any of NC's twenty coastal counties. If yes, answer 1h
below.
❑ Yes Q No
1 h. Is the project located within a NC DCM Area of Environmental Concern (AEC)?
❑ Yes Q No
2. Project Information
2a. Name of project:
Buck CTCC Raw Water Decoupling Project
2b. County:
Rowan
2c. Nearest municipality / town:
Salisbury
2d. Subdivision name:
2e. NCDOT only, T.I.P. or state project no:
nn rg
3. Owner Information
3a. Name(s) on Recorded Deed:
Duke Energy Corporation I JIM
3b. Deed Book and Page No.
IV V
800, page 244
3c. Responsible Party (for LLC if
applicable):
DENR - WATER RESOURCES
401 8 QUFFER PER
3d. Street address:
410 S. Wilmington Street
3e. City, state, zip:
Raleigh, NC 27601
3f. Telephone no.:
919 - 546 -7457
3g. Fax no.:
919- 546 -4409
3h. Email address:
steve.cahoon @duke - energy.com
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: ' '
Steve Cahoon
4c. Business name
(if applicable):
Duke Energy
4d. Street address:
410 S. Wilmington Street
4e. City, state, zip:
Raleigh, NC, 27601
4f. Telephone no.:
(919) 546 -7457
4g. Fax no.:
(919) 546 -4409
4h. Email address:
steve.cahoon @duke- energy.com
5. 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):
6501001
1 b. Site coordinates (in decimal degrees):
I Latitude: 35.71637 Longitude: - 80.37303
1 c. Property size:
332. acres
2. Surface Waters
2a. Name of nearest body of water to proposed project:
Yadkin River
2b. Water Quality Classification of nearest receiving water:
WS -V
2c. River basin:
Yadkin River
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 project site is located within Duke Energy's Buck electricity generation station in Salisbury, NC. The Duke Energy property contains a retired
steam station and a new combined cycle station. The steam station is positioned along the south stream bank of the Yadkin River, where sediment
has accumulated, preventing access to a portion of the raw water system and a private boat ramp. Land use in the area is industrial. El
3b. List the total estimated acreage of all existing wetlands on the property: 12
3c. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property: 4,000
3d. Explain the purpose of the proposed project:
See Attachment 1 - Project Description
3e. Describe the overall project in detail, including the type of equipment to be used:
See Attachment 1 - Project Description
4. Jurisdictional Determinations
4a. Have jurisdictional wetland or stream determinations by the
Corps or State been requested or obtained for this property /
project (including all prior phases) in the past?
❑ Yes ❑ No ❑X 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):
Agency /Consultant Company:
Other:
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
5. Project History
5a. Have permits or certifications been requested or obtained for
this project (including all prior phases) in the past?
❑X Yes ❑ No ❑ Unknown
5b. If yes, explain in detail according to "help file" instructions.
Previous permits have been issued for dredging activities of accumulated sediment in the areas described in this application.
6. Future Project Plans
6a. Is this a phased project?
❑ Yes ❑X No
6b. If yes, explain.
While this is not a phased project, we request a permit to allow for annual dredging at the intake structure to remove future sediment accumulation of
the same magnitude and by the same methods as described in this PCN.
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 ❑X Streams — tributaries ❑ Buffers ❑ 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 T
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
Yes /No
W3
Yes /No
W4
Yes /No
W5
Yes /No
W6
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
Dredging
Yadkin River
PER
Corps
300
750
S2
Dredging
Yadkin River
PER
Corps
300
110
S3
S4
S5
S6
3h. Total stream and tributary impacts
860
3i. Comments:
Dredging will be completed around the plant intake structure and at the on -site boat ramp. Project will only dredge to the original contours of the stream.
We expect to dredge approximately 12,00 cuo c yards Df accumulated sediment along the steam station structure and an approximately 30C cibc
yards of accumulated sediment at the boat ramp. We request a permit to allow for annual dredging at the intake structure to remove future sediment
accumulation of the same magnitude and by the same methods as described in this PCN.
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
Choose one
Choose
02
03
04
4f. Total open water impacts
4g. Comments:
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
5f. Total:
5g. Comments:
5h. Is a dam high hazard permit required?
❑ Yes ❑ No If yes, permit ID no:
5i. Expected pond surface area (acres):
5j. Size of pond watershed (acres):
5k. Method of construction:
6. Buffer Impacts (for DWO)
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
131
Yes /No
B2
B3
B4
B5
B6
6h. Total Buffer Impacts:
6i. Comments:
Page 5 of 10

D. Impact Justification and Mitigation
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
See Attachmen'. 2
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
See Attac' neat 2.
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
project?
❑ Mitigation bank
El Payment to in -lieu fee program
❑ Permittee Responsible Mitigation
3. Complete if Using a Mitigation Bank
3a. Name of Mitigation Bank:
3b. Credits Purchased (attach receipt and letter)
Type:
Type:
Type:
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 OX 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 ❑X No
within one of the NC Riparian Buffer Protection Rules?
1 b.
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?
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 project activity falls under a Nationwide Permit that does not require a stormwater management plan.
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 local government's jurisdiction is this project?
City of Salisbury
❑ Phase II
❑ NSW
3b.
Which of the following locally - implemented stormwater management programs
❑ USMP
apply (check all that apply):
❑ Water Supply Watershed
❑X Other: N/A
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):
[]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)
1 a. 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
❑ Yes
❑ No
letter.)
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
❑X No
or Riparian Buffer Rules (15A NCAC 2B .0200)?
2b. Is this an after - the -fact permit application?
El Yes
❑X 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
❑X 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.
This project will not result in additional land development.
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.
Dredge slurry will be pumped ton an upland storage pond where sediment will be allowed to settle. River water will return to the Yadkin River just
north of the settling basin via an existing Outfall 002 in accordance with the existing NPDES Permit.
Page 9 of 10
PCN Form — Version 1.4 January 2009

5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a. Will this project occur in or near an area with federally protected species or
❑ Yes ❑X No
habitat?
5b. Have you checked with the USFWS concerning Endangered Species Act
❑ Yes ❑X No
impacts?
5c. If yes, indicate the USFWS Field Office you have contacted.
-
5d. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical
Habitat?
National Heritage Program Map Viewer
6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as essential fish habitat?
❑ Yes ❑ No
6b. What data sources did you use to determine whether your site would impact Essential Fish Habitat?
NOAA Essential Fish Habitat Map
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
❑X Yes ❑ 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?
The NC Historic Preservation Office GIS Service indicates the project site is within the Study List Boundary for Green's Crossing at Trading Ford and
Military Camps, identified in 2003. However, the proposed project will not impact any historic structures or landmarks.
8. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA- designated 100 -year floodplain?
Q Yes ❑ No
8b. If yes, explain how project meets FEMA requirements:
Project will not impact the capacity of the floodplain.
8c. What source(s) did you use to make the floodplain determination?
FEMA Firm Map 3710579100K, Effective June 16, 2009
54e0- W\ C,„I,00Y)
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 1 - PROJECT DESCRIPTION
Duke Energy owns and operates a Combustion Turbine Combined Cycle (CTCC) power generation facility
on the Yadkin River at the north end of High Rock Lake, near Salisbury, NC. Duke also owns Buck Steam
Station, a retired coal fired power generation facility, located on the same site. Raw water for operation of
the CTCC facility is supplied via existing intake structures at the Buck Steam Station. The focus of the
current project is an improvement of the raw water system in preparation for future demolition of the
retired coal fired plant. Dredging is required to facilitate mobilization of barges and to complete
construction of the raw water system improvements. The anticipated schedule is to begin dredging in
June 201; and complete active dredging by August 2015. W-bile this is not a phased project, Duke Energy
requests that the issued permit also allow for annual dredging at the intake structure to remove future
sediment accumulation of the same magnitude and by the same methods as described in this PCN.
Improvements to the raw water supply system will consist of installation of new passive screens, new
submersible pumps installed in an existing intake structure, and a new raw water force main to deliver
water from the Yadkin River to the combined cycle station located on site. Existing intake structures not
used for raw water supply for the new plant and foundations below grade will be stabilized in place to
minimize disturbance.
Sediment deposition in the vicinity of the existing intake structures has buried key structural components
that must be accessed during construction. Additionally, sediment deposition at the facility's boat ramp
prevents mobilization of barges needed for both construction and the dredging activity itself. Dredging
along the front of intake units 1 through 6 is required to expose the north face of the structure for
equipment modifications and preparation for ultimate demolition of the steam station superstructure.
Approximately 12.000 CY of accumulated sediment will be dredged from the area within and in front of
intake units 1 through 6, and additional 0o Cl' of accumulated sediment will be dredged from a ilo' x 40'
area at the boat ramp to facilitate barge access. Dredging activities will only involve removal of
accumulated sediments to restore the river in these areas to original contours. The dredging footprint will
be kept to the minimum extents possible to reduce the volume of return water generated.
Exhibits SK -1 and SK -2 show the anticipated extent and depth of the dredging activity at the coal plant
outside of the intake structure. Exhibit SK -3 shows the extent of dredging activity at the boat ramp, and it
is assumed that up to 2 feet of sediment may be removed in this area to allow for the draft of the barges.
Dredging will be accomplished with a barge- mounted long -reach excavator with an eddy pump dredging
attachment. Dredge spoils will be pumped upland via a temporary force main to an existing ash settling
basin for dewatering. The ash basin is located approximately 1/2 mile upland from the ordinary high water
mark of the Yadkin River. After the solids have settled, river water will be returned to the Yadkin River
via an existing discharge outfall ( Outfall 002), just north of the settling basin, currently permitted under a
general NPDES permit. A site plan showing the anticipated impacts, temporary equipment installation,
and location of the dredging and slurry disposal is presented in SK -4.
The ash basin is equipped with water control devices to ensure maximum settling prior to return water
discharge to the Yadkin River. Sufficient freeboard will be maintained for the duration of the dredging
activity so as not to adversely affect the settling basin performance or result in overflow of the ash basin.
The settleable solids concentration of the return water will be monitored, upstream of the point of
discharge, to ensure compliance with North Carolina 401 certificate requirements (WQC #3888).

Erosion and sedimentation control practices will be maintained along the stream bank during dredging
and construction activities. This includes the installation and maintenance of silt fence around the project
area to prevent release of sediment from the disturbed upland areas to the river.,A stabilized construction
entrance will be installed near the boat ramp to limit disturbance by vehicles and equipment being
transitioned to barges. Upon completion of the dredging activity, the upland project area will be stabilized
by seeding and mulching to establish permanent vegetative cover. After permanent vegetative cover has
been restored, the silt fence will be removed from the project area.
The dredging technology selected generates little turbidity, and it was thus determined that a turbidity
curtain would not be required for this project ho��ever as an added precaution a localized turbidity curtain
may be utilized at the barge and mo�,ed with the dredging process.

ATTACHMENT 2 — AVOIDANCE AND MINIMIZATION DESCRIPTIONS
Section D, la. Specifically describe measures taken to avoid or minimize the proposed impacts in
designing the project.
Dredging will be limited to only accumulated sediment, with no permanent impacts to the river bottom.
Traditional E &SC measures will be installed along the stream bank to prevent sediment runoff from
upland areas. A stabilized construction entrance «-ill be irlstalled'near the boat ramp to limit disturbance
by vehicles and equipment being transitioned to barges. The dredging method selected generates little
turbidity, and it was determined that a turbidity curtain is not required, hoNvever as an added precaution it
localized turbidity curtain may be utilized at the barge and moved «-ith the dredging process . The dredge
slurry will be pumped to an existing upland settling basin where the sediment will be allowed to settle.
River water will return to the Yadkin River via existing Outfall 002 in accordance with the existing NPDES
permit.
Section D, 1.b. Specifically describe measures taken to avoid or minimize the proposed impacts through
construction techniques.
A barge- mounted long -reach excavator with an eddy pump dredging attachment will be utilized to remove
the accumulated sediment. Traditional E &SC measures will be installed along the stream bank to prevent
sediment runoff from upland areas. A stabilized construction entrance «-ill be installed near the boat ramp
to limit disturbance by vehicles and equipment being transitioned to barges. The dredging method
selected generates little turbidity, and it was determined that a turbidity curtain is not required, however
as an added precaution a localized turbidity curtain may be utilized at the barge and moved with the
dredging process.

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.✓ ✓ ✓J✓ "R .�- �UUU
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:20 000 Project Site: 0 0.175 0.35 0.7
Latitude: - 80.376302 Miles
Longitude: 35.713888
Buck Combined Cycle Station
Raw Water Decoupling Project
Pre - Construction Notification for NWP 16 - Return Water From Upland Contained Disposal Areas
Topographic Map

K � r
Figure 1: Aerial view of Buck Site. Accumulated Sediment will be removed from the face of the steam station and at the on -site boat launch
to complete improvements to the raw water supply system. A temporary force main will be laid from the streambank to the existing settling
basin for dredge slurry deposition. Settled water will flow through the settling basins to an overflow point, where water will return to the
Yadkin River through a NPDES permitted outfall ( Outfall 002, outside of aerial view).
Buck Combined Cycle Station Decoupling Project

t-'
I
I
I
I
Figure 2: Facing West. Extent of dredging along the Yadkin River is
shown. This Project will result in a total of 650 LF of temporary stream
impacts as a result of accumulated sediment removal during dredging to
restore this section of the Yadkin River to its original contours.
II
1
Figure 2: Facing East. Extent of dredging along the Yadkin River is shown. This
Project will result in a total of 650 LF of temporary stream impacts as a result of
accumulated sediment removal during dredging to restore this section of the Yadkin
River to its original contours.
Buck Combined Cycle Station Decoupling Project

Figure 4: Facing South. Photo shows existing settling basin. The basin berm can be seen in
the background of the picture. Influent piping from ash slurry and cooling tower blowdown
shown in foreground. Temporary forcemain piping will be routed from the dredge rig to the
settling basin, approximately 0.5 mile upland of the Yadkin River. Settled water will flow
through the settling basins to an overflow line that will discharge river water back to the Yadkin
River just north of the final settling basin via existing Outfall 002.
Buck Combined Cycle Station Decoupling Project

I 1 1656'
GRAPHIC SCALE
n :a m
is FKVT
11-h = 100 n
' a � Dewberry'
Dewberry Engineers Inc.
2301 REXWOODS DRIVE
SURE 200
RALEIGH, NC 27607
PHONE: [phone]
FAX: [phone]
MIL IIIL- DREDGING AREA
2015.04.23 AT INTAKE STRUCTURE
PROJ. NO. PROJECT
BUCK COMBINED CYCLE STATION
50061328 DECOUPLING PROJECT
SK -1

635.15 - - - - - --
EX. BOOM EX. BOOM
AT SECTION B AT SECTION A
rEX. SEDIMENT PROFILE AT
/ SECTION B
EX. SEDIMENT PROFILE AT
SECTION A
3
PROPOSED SEDIMENT � 1
PROFILE AT SECTION B
Ir
I EX. UPPIR
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LOCATION
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UNITS
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LOCATION
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UNITS
5 $ 6
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--
PROPOSED SEDIMENT
597.15 --
PROFILE AT SECTION A
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AT INTAKE STRUCTURE
A ,yr
593.15
APPROX. LOCATION OF ORIGINAL
STREAMBED
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LOCATION
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UNITS
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Dewberry"
2015.04.23
AT INTAKE STRUCTURE
Dewberry Engineers Inc.
2301 REXWOODS DRIVE
SUITE 200
PROJ. NO.
PROJECT
BUCK COMBINED CYCLE STATION
PHONE. 19 19
PHONE:
50061328
DECOUPLING PROJECT
881991.9838
FAX: [phone]
NCBELS N F-0929
Ir
I EX. UPPIR
;� GATE II
LOCATION
BASED ON
UNITS
5 & 6
' EX. wumu
4 y''
EX. LOWER
I GATE
LOCATION
BASED
UNITS
5 $ 6
k:
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SK-2

DREDGING AREA
t
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1
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GRAPHIC SCALE
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BOAT RAM P
ACCESS ROAD
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;:
y 2015.04.23 AT BOAT RAMP
�' Dewberry Engineers Inc.
=1 NE1(WOODS DANE PROJ. NO. PROJECT SK-3
sUrtE290 BUCK COMBINED CYCLE STATION
FLALSGH PHONE' `� ' 50061328 DECOUPLING PROJECT
PHONE: [phone]
FAX: [phone]
Nr9EL8 t F0929

I FORCE MAIN ' TO EXISTING OUTFACE 002
! • CTIVE ASH BASIN
ti ECONDARY CELL
ACTIVE ASH BASIN •'
()L lJ PRIMARY CELL •a
DIRECTION OF RETURN WATER FLOW
KEDGE SLURRY DISCHAR WITHIN HYDRAULICALLY LINKED SETTLING BASINS
TO SETTLING BA
ACTIVE ASH BASIN
PRIMAR`/CELL
.;
l y }
-. 'jr g .'
n •' OVERALL . •
Dewberry 1 14
OW Dewberry Engineers Inc.
2W1 FIEXWOODS DRIVE PROJ. NO. PROJECT SK-4
SUITE .00
RALE111H. NC 27607 BUCK COMBINED CYCLE STATION
PHONE 919 881 "39 50061328 DECOUPLING PROJECT
NCO ' " :92