20140694 Ver 1_401 Application_20140714

t ' DUKE
ENERGY
Jul. 3, 2014
Ms. Karen Higgins
North Carolina Division of Water Resources
401 & Buffer Permitting Unit
1650 Mail Service Center
Raleigh, North Carolina 27699 -1650
RE: Duke Energy Carolinas, LLC.
Dan River Steam Station
Pre - Construction Notification — Closure of 36 inch Corrugated Metal Pipe
Dear Ms. Higgins:
201 40694
410 S Wilmington St.
Raleigh NC 27601
Duke Energy Carolinas, LLC. is proposing to close the entrance of the 36 inch corrugated metal
pipe (CMP) at the Dan River Steam Station located in Rockingham County, North Carolina. The
discharge end of the CMP was closed in February/March of this year. In order to close the
entrance to the 36 inch CMP it is necessary to install a coffer dam in a wetland area
immediately adjacent to the entrance of the pipe. There will be 0.1 acres of tempoary impacts
to wetlands and 65 linear feet of tempoary stream channel impacts as a result of the pipe
closure.
Thank you for your assistance with this project. If you have any questions or comments
regarding this letter please contact me at (919) 546 -7457 or steve.cahoon(a�duke- energy.com.
Sincerel ,
Ste hen G. Cahoon
Sr. Environmental Specialist
Duke Energy Environmental Services Department
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Corps action ID no.
PAID
o < DWQ project no.
Form Version 1.4 January 2009
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Page 1 of 10
PCN Form — Version 1.4 January 2009
Pre - Construction Notification (PCN) Form
A.
Applicant Information
1.
Processing
1 a.
Type(s) of approval sought from the Corps:
❑X Section 404 Permit ❑ Section 10 Permit
1 b.
Specify Nationwide Permit (NWP) number: NWP 18 or General Permit (GP) number:
1 c.
Has the NWP or GP number been verified by the Corps?
❑X Yes ❑ No
1 d.
Type(s) of approval sought from the DWQ (check all that apply):
Z 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 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 1 h
below.
❑ Yes ❑ No
1 h.
Is the project located within a NC DCM Area of Environmental Concern (AEC)?
❑ Yes ❑x No
2.
Project Information
2a.
Name of project:
Duke Energy Carolinas, LLC - Dan River Steam Station 36 -inch Culvert Plug
2b.
County:
Rockingham
2c.
Nearest municipality / town:
Eden
2d.
Subdivision name:
N/A
2e.
NCDOT only, T.I.P. or state project no:
3.
Owner Information
3a.
Name(s) on Recorded Deed:
Duke Energy Carolinas, LLC
3b.
Deed Book and Page No.
Deed Book: 1411; Page Number: 2100
3c.
Responsible Party (for LLC if
applicable):
3d.
Street address:
900 S. Edgewood Road
3e.
City, state, zip:
Eden, NC 27288
3f.
Telephone no.:
(919) 546 -7457
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3g.
Fax no.:
(919) 546 -4409
3h.
Email address:
steve.cahoon @duke - energy.com
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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
41,0 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
Joshua Bell, PE (Senior Water'Resources'Engineer)
5b
Business name
(if applicable),
AMEC Environment & Infrastructure, Inc-
5c
Street address-
2801 Yorkmont Road, Suite 100
5d
City, state, zip
Charlotte, North Carolina 28208
5e
Telephone no
(704) 517 -261`8
5f
Fax no
(704) 357 =8638
5g
Email address
lo`sh bell @amec com
Page 2 of 10

B.
Project Information -and Prior Project History
1.
Property Identification
1a
Property Identification no (tax PIN or parcel ID)
PIN 798908886870
1.b
Slte�coordinates (In decimal degrees)
Latitude 36 491626 Longitude 79 715941
1c
Property -size
1 31 acres
2.
Surface Waters
2a
Name of nearest body of water -to proposed project
Dan River
2b
Water Quality Classification of-nearest receiving water
Dan River = C
2c
River basin
Roanoke River Basin i HUC 03010103'
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
A potentially jurisdictional scrub /shrub wetland with an herbaceous component and a perennial stream occur within the project site General land use
in the 'vicinity of the project site, includes ,power�generation,facilities (buildings, parking lots, etc ), ash ponds and ash fill areas, a rail service line,
maintained grassed areas, and shrub and brushland'
3b
List the total estimated acreage of all existing wetlands on the property 0 11
'3c
List the total estimated linear feet,of allFexisting streams (Intermittent and perennial) on the property 64 9
3d Explain the purpose of the proposed project
The purpose of the project is to plug an existing 36 "inch diameter reinforced concrete culvert to prevent water from flowing under the ash fill basin
3e Describe the overall project'in detail, Including the type of equipment to be used
The culvert will be plugged using cement A cofferdam will be placed and inflows will be piped to the secondary ash pond See Item 'C2h' for details
4.
JUtisdictional Determinations
4a
Have jurisdictional wetland orlstream determinations by the
Corps or State -been requested or obtained for this property /
project (including all prior phases) In the past?
❑ Yes Q 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)
Agency /Consultant Company -
Other
4d If yes, list the dates of the Corps jurisdictional determinations or State determinationsrand attach documentation
The discharge end of the 36 -inch pipe was closed in February/March 2014 Please see the attached email from David Shaffer of the U S Army Corps
of,Engineers indicating that the discharge end was above the OHWM and no permit was required for closure
5.
Project History
5a
Have permits or,certifications been requested or obtained for
this project (including all prior,phases) in the past?
❑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❑,allo
6b
Ifyes, explain
Page 3 of 10
PCN Form — Version 1 4 January 2009

C. Proposed, Impacts Inventory
1. 'Impacts Summary
la Which sections were completed below for your project (check all that apply)
❑X Wetlands x❑ Streams = tnbutanes ❑ 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
2b
2c
2d
2e
2f
Wetland impact
Type,of impact
Type of,wetland
Forested
Type of jurisdiction
Area of
number
Corps (404,10) or
impact I
Permanent (P) or
DWQ (401, other)
(acres)
T
—Temporary
W1 T
Flooding
Seep
No
Corps
00973
W2 T
Fill
Seep
No
Corps
000,1
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:
00983
2h Comments
Wetland impacts are temporary due to stormwater impoundment (flooding) and cofferdam placement (temporary-fill)- Any water that is impounded will
be mmoved'wdhin 72 hours via pumping to the secondary ash pond The stormwater diversion will result in a temporary impoundment, based on 25-
year event runoff storage Access for construction equipment and materials will be provided via adjacent maintained roadways Please see the
attached Plan View and Cross - Section drawings Note In the above table, W1, and`W2 occur within'the same wetland system
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
3b
3c
3d
3e
3f
3g _
Stream impact
Type of impact
'Stream name
Perennial (PER) or
Type -of
,Average
Impact
number
intermittent (INT)?
jurisdiction
stream
'length
Permanent (P) or
width
(linear
Temporary (T)
(feet)
feet)
S1 T
Flooding
Unnamed Tributary
INT
Corps
1 5
61
S2' T
Fill
Unnamed Tributary
INT
Corps
1 5
39
S3 -
Choose one
-
-
S4
Choose one
-
S5 -
Choose one
S6 --
Choose one
-
-
3h Total stream and tributary impacts
649
31 Comments
Stream impacts are temporary due to stormwater impoundment (flooding) and cofferdam placement (temporary fill) Any water that is impounded will
be,removed within 72 hours via pumping to;the secondary°ash pond The stormwater diversion will result in a temporary impoundment, based on'25-
year event runoff storage Access for construction equipment and materials will be provided via adjacent maintained roadways_ Please,see the
attached -Plan View and Cross- Sectionldrawings' Note In the,above table, S1 and S2 occur within the same stream reach
Page,4 of 10
PCN Form – Version 14 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 thewindiVii ually 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 -
Choose one
Choose
03 -
Choose one
Choose
04 -
Choose one
Choose
4f Total open water impacts
4g Comments
5. Pond or Lake Construction
If pond, or lake construction proposed, then com lete'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, permitADino
51 Expected pond surface area (acres)
5.1 Size of pond watershed (acres):
5k Method of'construction
6. Buffer Impacts (for DWQ)
If project will impact a protected npanah buffer, then complete the chart below If yes, then individually list all buffer'impacts
below If-any impacts require mitigation,, then ou MUST'till 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
T
6c
Reason'for°impact
6d
Stream,name
6e
Buffer
mitigation
required?
6f
Zone 1
impact
(square
feet )
6g
Zone 2
impact
(square
feet
—Temporary
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,5 -of'10

D. Impact Justification and Mitigation
1. Avoidance and Minimization
1 a_ Specifically describe measures taken to avoid or minimize the proposed impacts,in designing project,
The project "has been designed to avoid permaneneimpacts to jurisdictional surface waters Avoidance measures in inserting the grout (plug) into the
.36 -inch culvert opening wdl,entail the use of best management practices and approved construction techniques- water that is impounded Will be
removed within 72 hours via pumping to the secondary ash pond The proposed action at this location will, result in minor temporary impacts,to
,potentially jurisdictional surface waters
lb Specifically descnbe measures:taken to avoid or minimize the proposed impacts through construction techniques
,Impacts to jurisdictional surfacematers 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
controllbest management practices will be util¢ed'to avoid impacts to wetlands and'streams through 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 ❑ No
2b If yes, mitigation is required by (check all thatapply)
❑ DWQ ❑ Corps
2c If yes, which mitigation option will be used for this
pro)ect?
❑ Mitigation bank
El 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_ Choose one
Type Choose one
Type- Choose one
Quantity
Quantity_
Quantity
3c Comments
4. Complete if Making a Pa ment,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 Buffet 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 Pernifttee 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 square4eet of impact.tofeach zone of'the npahan 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. DiffuseTlow Plan
1a Does the project include or is,it adjacent to, protected,nparian buffers, identified
❑ Yes X❑ 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?
1 %
2b Does this project require a Stormwater Management Plan?
❑ Yes 0 No
2c If'this project'DOES'NOT require a Stormwater Management Plan, explain why -
The project site meets the low density criteria as,specified under DWR Water Quality Certification No 3890, i e , the,project has a built upon area of
less than 1 % BMPs have also been designed to meet the requirements of Water Quality Certification No 3890 for low density development The
proposed action,will not add impervious area to the project As specified by Water'Quality Certification No 3890, two copies of the DWR Low Density
Supplement Form are attached to this PCN application
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?
DWR 401,Unit
3. Certif'ed Local Government Stormwater Review
3a In which local government's jurisdiction is this project?
N/A
❑ Phase II
❑ NSW
3b Which of the following locally- implemi4nted�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 X❑ No
attached?
4. DWQ Stormwater Pro- ram Review
❑Coastal counties
❑HQW
4a 'Which of'the following_ state - implemented Stormwater management programs apply
❑'ORW'
(check'all that apply)
❑Session Law 2006 -246
Z Other Low Density (WQC 3890)
4b Has,the approved Stormwater Management Plan with proof of approval been
❑ Yes ❑X 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?
❑X ,Yes ❑ No
Page 8 of 10
PCN Form — Version 1 4 January, 2009

F. Supplementary„Information
1.
Environmental Documentation (DMAequirement)
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*7
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 El No,
(North Carolina) Environmental Policy Act,(NEPA9SEPA)?
1c
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 E] No
letter)
Comments
2.
Violations (DWQ Requirement)
2a
Is the site in violation of DWQ Wetland Rules (15A NCAC 2H 0500), Isolated
Wetlarid Rules (15A NCAC 2H 1300), DWQ Surface Water or Wetland Standards,
❑ Yes X❑ No
or Riparian Buffer Rules (15A.NCAC 2B 0200)
2b "Is this an after - the -fact permit application?
❑TYes ❑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
[-],Yes ONO
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
Should wastewater be,generated from the grouting of the plug of the 36 -inch culvert, the,wastewater will be pumped1to the secondary ash pond The
proposed achon.of grouting the plug will not generate additional wastewater once the plug is in place
Page 9 of 10
PCN Form — Version 1 4AJanua y 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 ❑ No
impacts?
5c If yes,'indicate the USFWS Field Office,you have contacted
Raleigh
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 the North Carolina Natural Heritage Program (NCNHP)
Natural Heritage Database Search interactive website A copy of the,IPaC database query results for this project is attached herein
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?
NOAA National Manne,Fishenes Service — online interactive software " Essential'Fish Habitat Mapper v3,0"
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 ❑ No
status (e g , National Historic Trust designation or properties significant in
North Carolina history and archaeology)?
7b What data sources didryou'use to determine whether your site +would impactihistoric or'archeological, resources?
North Carolina Department of Cultural Resources, State Historic Preservation Office (SHPO) interactive web site ( HPOWEB) A- graphic exhibit of the
HPOWEB map query for the project vicinity is attached herein
8. Flood Zone Designation (Corps Requirement)
8a Will this project occur in a FEMA- designated 100 -year floodplain?
❑ Yes ❑X No
8b If,yes, explain how project meets FEMA requirements -
8c What source(s) did you useito make the floodplain determination?
A graphic exhibit of the °100 year flogdplain for the project vicinity is attached`herein Source 'FEMA/FIRM, map °numbers 3710798900J, 37107,99900J„
and'3710709000J, dated July 3, 2007
4c ✓G CG 40am
Applicant/Agent's Printed Name
Date
Applicant/Agent's Signature
(Agent's signature is valid only if an authonzation
letter from the applicant is provided
Page 10 of 10

USACE Pre - Construction Notification — NWP 18
Duke Energy Carolinas, LLC - Dan ,River, Stearn 'Station 36 -inch Culvert Plug'
Rockingham County',, ,NC
ATTACHMENTS
Figure 1
Site Location Map
Figure 2
Aerial Photograph
Figure 3
NRCS Soils Map
Figure 4
USFWS NWI Map
Figure 5
SHPO Map
Figure 6
FEMA 100 -Year Floodplain Map
Plan View drawing
Cross - Section drawing
Email correspondence, dated February 1,9', 201.4, from David Shaeffer, USAGE, to Steve
Cahoon, Duke Energy
DENR Low Density Supplement Form
USFWS Information, Planning, and Conservation System (IPaC) database search results

i all et
i Sewage D '
i • It
AV
P)werphlo -'
• `^tip •�+y , • �,�. �
f
•14 gamma to
X6
0 Wa
Source: USGS 24k Map Sheets, Southeast Eden and Northeast Eden
rV
Nj
(r
N
0 500 1,000 2,000
Feet
SITE LOCATION MAP
DUKE 36 -INCH CULVERT PLUG
�' ENERGY ameo DUKE ENERGY DAN RIVER STEAM STATION
ROCKINGHAM COUNTY NORTH CAROLINA
In(
r
J�
PREPARED DATE CHECKED DATE JOB NUMBER FIGURE
BY SJP 7/1/2014 BY RGH 7/1/2014 6226 -14- 0004.02.022 1

- - - - - - - - .....
PROJECT AREA
a Ful
—f
F �r
._
's
Map Symbol Description
AyC Ayersville gravely loam 4 to 15 percent slopes
AyF Ayersville gravely loam, 15 to 45 percent slopes
CmB Clover sandy loam 2 to 8 percent slopes
CTO Clover sandy loam, 8 to 15 percent slopes
DaA Dan laver loam, 0 to 2 percent slopes, frequently flooded
Sv8 Stoneville loam, 2 to 8 percent slopes
SvD Stoneville loam. 8 to 15 percent slopes
Ud Udorthenls, loamy
W Water
Source: http: / /goto. arcgisonline .com /maps/World_Imagery. accessed July 1, 2014; USDA NRCS Soil Survey Geographic (SSURGO) database for N
Rockingham County, North Carolina, dated December 21, 2013.
Soil Type Boundary
0 250 500 1,000
Feet
NRCS SOILS MAP
40) DUKE 36 -INCH CULVERT PLUG
ENERGY.: ameO DUKE ENERGY DAN RIVER STEAM STATION
ROCKINGHAM COUNTY, NORTH CAROLINA
PREPARED DATE CHECKED A JOB NUMBER FIGURE
BY SJP 7/1/2014 BY RGH 7/1/2014 6226 -14- 0004.02.022 3

PUBHh
t
PUSCh
PUBHh
PUBHx
R2UBH
�
Classification Description
PUBFh Palustrine, Unconsolidated Bottom Permanently Flooded, Diked /krpounded
` s PUBW Palustrine, Unconsolidated Bottom Pernanenty Flooded, Excavated
' PUSCh Palustrine, Unconsolidated Shore, Seasonally Flooded, Dked /Irrpounded
R2UBH I Rvenne. Lower Perennial, Unconsolidated Bottom Permanently Flooded
Source: http: / /goto. arcgisonline .com /maps/World_lmagery, accessed July 1, 2014; U.S. Fish and Wildlife Service, National Wetlands Inventory GIS N
database, dated May 1, 2014.
- Freshwater Pond W Other = Riverine
0 250 500 1,000
Feet
USFWS
4nDUKE 36 -INCH CU EIRTAPLUG
ENERGY, a DUKE ENERGY DAN RIVER STEAM STATION
ROCKINGHAM COUNTY, NORTH CAROLINA
PREPARED DATE 1(;HECKED IDA JOB NUMBER FIGURE
BY SJP 7/1/2014 BY RGH 7/1/2014 6226 -14- 0004.02.022 4
!
s�. ♦grlr r
IN
PROJECT AREA
PUBHh
t
PUSCh
PUBHh
PUBHx
R2UBH
�
Classification Description
PUBFh Palustrine, Unconsolidated Bottom Permanently Flooded, Diked /krpounded
` s PUBW Palustrine, Unconsolidated Bottom Pernanenty Flooded, Excavated
' PUSCh Palustrine, Unconsolidated Shore, Seasonally Flooded, Dked /Irrpounded
R2UBH I Rvenne. Lower Perennial, Unconsolidated Bottom Permanently Flooded
Source: http: / /goto. arcgisonline .com /maps/World_lmagery, accessed July 1, 2014; U.S. Fish and Wildlife Service, National Wetlands Inventory GIS N
database, dated May 1, 2014.
- Freshwater Pond W Other = Riverine
0 250 500 1,000
Feet
USFWS
4nDUKE 36 -INCH CU EIRTAPLUG
ENERGY, a DUKE ENERGY DAN RIVER STEAM STATION
ROCKINGHAM COUNTY, NORTH CAROLINA
PREPARED DATE 1(;HECKED IDA JOB NUMBER FIGURE
BY SJP 7/1/2014 BY RGH 7/1/2014 6226 -14- 0004.02.022 4

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i
Harmon, Richard G
From: Shaeffer, David L SAW [David L Shaeffer @usace army mil]
Sent: We February 19, 2014 7 27 AM
To: Cahoon, Steve
Cc: Higgins, Karen (karen higgins @ncdenr gov)
Subject: RE Duke Energy's Dan River Steam Station ­36 inch Storm Water Pipe (UNCLASSIFIED)
* ** This is an EXTERNAL email. Exercise caution. DO NOT open attachments or, click links from
unknown- senders or unexpected email. * **
Classification: UNCLASSIFIED
Caveats,: NONE
H'i Steve,
I concur. The area show in the photographs is above the OHWM'and appears to be uplands. A 404
permit would not be required for discharges in these- areas.
Sincerely,
David L, Shaeffer, Geographer -
U.&. Army Corps of Engineers
Raleigh Regulatory Field Office
3331 Heritage Trade Drive, Suite 105
Wake Forest, North Carolina 27587
Phone: [phone] ext. 31 Fax: [phone]
Original Message---- -
From: Cahoon, Steve [ mailto :Steve.Cahoon(@duke- energy.com]
Sent: Tuesday, February 18, 2014 12 °:03 PM
To: Shaeffer, David L- SAW
Cc: Higgins, Karen (karen.higgins0ncdenr.gov)
Subject: [EXTERNAL] Duke Energy's Dan River Steam Station - 36 inch Storm Water Pipe
Hi David,
Duke Energy has'been asked to provide a plan to close a 36" storm drain pipe at the Dan River
Steam Station. This pipe is located downstream of the 48" storm water pipe (see attached PDF).
At this point in time we are planning to expand an existing platform in the vicinity of the 36"
storm water pipe. The plan is to expand the platform toward the river and to the right of the
existing platform (see attached 2014 -92 -18 Dan River 004) on flat ground. Duke Energy believe
that the platform expansion will be in upland areas above the ordinary high water mark (OHWM) of
the river. The velocity of the river depicted in image 004 is at approximately 3,600 cubic feet
per second (cfs) well above the point that Duke Energy believes depicts the OHWM for the river.
,Du"'ke,Energy'believes the OHWM,for the river at the Dan' Diver Station is approximately 2,200 cfs.
In,no case will the - expanded pl °atform,be any closer than 4 feet above the river's edge depicted in,
image 004. Image 0694 depicts'an area that was, dug out to build the existing platform. Duke
Energy will need to dig out an area similar to the area depicted in image 0694 to form the base
for the platform expansion. The platform will be expanded to approximately 1.5 times its current
size. Appropriate erosion control measures will be used in an effort to try and keep sediment
from reaching river. All work associated with this project will be completed on the north side of
the river, away from any potential Section 106 issues.
1

Duke Energy believes that there are no permits needed from the USACOE to expand the existing
onsite platform because the work will be conducted in uplands above the OHWM. Please reply to
this email with your assessment of the need for permits from the USACOE for completing this work.
Please contact me with any questions.
Thanks for your help,
Steve
Classification: UNCLASSIFIED
Caveats: NONE
2

Permit No.
(to be provided by DEMM)
State of North Carolina
Department of Environment and'Natural Resources
Division of Energy, Mineral and Land Resources
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
LOW DENSITY SUPPLEMENT
This form may be photocopied for use as an original
A low density project is one that meets the appropriate criteria for built upon area and transports stormwater
runoff primarily through vegetated conveyances Low density projects should not have a discrete storm, water
collection system as defined by 15A NCAC 214.1002(18). Low density requirements and density factors can be
found in Session Law 2008 -211, 15A NCAC 2H .1000, Session Law 2006 -246 and the State of North Carolina
Stormwater Best Management Practice Manual. Curb and gutter systems are allowed provided they meet the
requirements in 15A NCAC 2H. I 008(g).
I. PROJECT INFORMATION
Project Name ^ Duke Dan River Protect - 36 -inch Culvert Plug
Contact Person: Joshua Bell, P E. Phone Number: ( 704 )517 -2618
Number of Lots:N /A Allowable Built Upon Area (BUA), Per L' of *N /A
Number of Dwelling Units Per Acre * *:N /A
Low Density Development (check one) ❑ without curb & gutter ❑ with curb & gutter, outlets to (check one):
❑ Swales ❑ Vegetated Area
*If lot sizes are not uniform, attach a table indicating the number of lots, lot sizes and allowable;built upon area for each lot.
The attachment must include the project name, phase, page numbers and provide area suhtotals,and totals: 'BUA shall Ve
shown-in units of square feet.
* *(Phase H Post - Construction [non -SAl only)
II. BUILT UPON AREA
Refer-to DEMLR's forms and applications website for specific language that must bexecorded in the deed
restrictions for all subdivided projects. ( http -' / /portal.ncdenr..org/web /lr /state- stormwater -forms does)
Complete the following calculation in the space,provided below where:
• SA Site Area - the total project area above Mean High Water.
• DF Density Factor - the appropriate percent built upon area divided by 100.
• RA Road Area - the total impervious surface occupied by roadways.
• OA Other Area - the total area of impervious surfaces ,such,as clubhouses, ,tenms courts, sidewalks, etc.
• No. of Lots - the total number of lots in the subdivision.
• BUA per Lot - the computed allowable built upon area for each lot including driveways and impervious
surfaces located between the front lot line and the edge of pavement.
• Total allowable lot BUA - the computed, allowable�built upon area for all lots combined.
• Total BUA from lot listing - the sum of built upon area allocated for each lot on the list of non - uniform lots.
Form SW401 -Low Density- Rev.3- 2/10/09 Page 1 of 4

For - uniform lot sizes: '
(SA ft, 2 x DF• ) — (RA ft2) — (OA: ft2) = BUA per Lot = ft2
(No of Lots:, )
For non - uniform, lot sizes:
a. (SA ft2 x DF: ) — (RA: ft2) — (OA: ft2) =Total ,allowable lot BUA = ft2
b. Total BUA from lot listing: A b must'be < a
III. DESIGN INFORMATION
Complete the following table. If additional space is needed the information should be provided in the "same
format as Table 1 and attached to this form. Rainfall intensity data can be found in Appendix 8.03 of the State
of North Carolina Erosion and Sediment Control Planning and Design Manual or at
http: //hdsc nws noaa gov/hdsc /pfds/
rr_l_ Q­--l- Aon,— l,noaA nn t}1P 111_vPnr c+nrm
Swale No.
Drainage
Area (ac)
Impervious
Area (ac)
Grassed
Area (ac)
C
Q
(cfs)
Slope
N
wallow
(fps) -� 1
vactual
(fps)
Flow
Depth (ft)'
1
-
2
3
4
5
6
7
8
9
10
11
12
13
14
-
15
16
17
18
19
2'0
Form SW401 -Low Density-Rev 3- 2/10/09 Page 2 of 4

W. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Administrative Code ,Section 15A
NCAC 2H .1000, NCDENR BMP Manual (2007), Session Law 2006 -246, and Session Law 2008 -211.
Please indicate the page or plan sheet numbers where the supporting ,documentation can be found. An
incomplete submittal package will result in a request for additional information. This will delay final
review and approval of the project. Initial in the space provided to indicate that the following requirements
have been met and supporting documentation is provided as necessary. If the applicant has designated an agent
on the Stormwater Management Permit Application Form, the agent may initial below. If any item is not met,
then iustification must be attached. Only complete items n through p for projects with curb outlets.
Page/Plan
Initials Sheet No.
a. t
For projects in the °20 coastal counties- Per NCAC 2H.1005, a 50 foot-wide vegetative buffer
is provided adjacent to surface waters. For Redevelopment projects, a 30' wide vegetative
buffer adjacent surface waters is provided.
b. t
For HQW or ORW projects outside the 20 coastal counties A 30 foot wide vegetative buffer
is provided adjacent to- surface waters.
C. '
For Phase H Post - Construction projects: All built-upon area is located at least 30 feet
landward of all perennial and intermittent surface waters.
d.
Deed restriction language as required on form SWU -101 shall be recorded as a restrictive
covenant. A copy of the recorded document shall beyrovided to DWQ within 30 days of
platting and prior to the sale of any -lots.
e.
Built upon area calculations are provided for the overall project and all lots.
f.
Project conforms to lbw density requirements within the ORW AEC'.,(if applicable per
15A NCAC 2H. 1007)
g.
Side slopes of swales are no steeper than, 3:1; or no.steeper'than 5:_1 for curb outlet,swales.
h.
Longitudinal slope of swales is no greater than 5 %; for non -curb outletprojects, calculations
for shear, stress and velocity are provided if slope is greater than 5r %.
1.
At a minimum, swales are designed to carry the 10 -year storm velocity at a non - erosive rate.
j
Swales discharging to wetlands are designed to flow into and through the wetlands at a non-
,
erosive velocity {for'this flow requirement into wetlands, non - erosive is velocity < 2 ft/.$).
k.
Swale detail and permanent vegetation is specified on the plans.
1
Swale detail provided on plans; includes,grass type(s) for`permanent vegetative cover.
m.
Swales are located in recorded, drainage easements.
n.t t
,Length of swale or vegetated area is at least 100, feet for each curb outlet.
o.tt
The system takes into account the run -off at ultimate built -out potential' from all surfaces
draining to the system (delineate drainage area for each swale).
p tt
Curb outlets direct flow to a swale or vegetated area
t Projects in' the Neuse, Tar - Pamlico, Catawba River basins, and Randleman Lake may require additional buffers.
tt Only complete these items for projects with,curb outlets.
Form SW401 -Low Density- Rev'3- 2/10/09 Page 3 of 4

' V. SWALE SYSTEM MAINTENANCE REQUIREMENTS
1. Mowing will be accomplished as needed according to the' season. Grass height will not exceed six inches at
any time; and grass wilLnot be mowed too close`to the ground or "scalped ".
2. Swales will be inspected monthly,or after every runoff producing rainfall event ;fot sediment build -up,
erosion, and trash accumulation.
3. Accumulated sediment and trash will be removed as necessary. Swales will be reseeded or sodded
following sediment removal.
4. Eroded areas of `the swales will be repaired and reseeded. Swales will be revegetated as needed and in a
timely manner`based on the monthly inspections. Side slopes must be maintained at the permitted slope.
5. Catch basins, curb cuts, velocity reduction devices, and piping will be inspected monthly or after every
significant runoff producing rainfall event. Trash and debris will be cleared away°from grates, curb cuts,
velocity reduction devices and piping.
6. Swales will not be altered, piped, ovfilled in without approval from NCDENR Division of Energy, Mineral
and Land Resources.
I acknowledge and agree by my signature below that I am responsible for the perfotmance of the, six
maintenance procedures listed above. I agree to notify DEMLR of any problems with the system or prior to any
changes to the system or responsible-party.
Print Name and Title;
Address;2801 Yo
Phone •7045L7j6i 9=
Signature�
Note. The gally rei
resident of the
I,
a ''BSe1,P
Charl
Date.. �) 2 -z-,- ( "I
T
��67 �1'2�Zow
s�iel� sot be a homeowners association unless -more than 50% of the lots have been sold and a
V PkntOb,,Pnamedthepresident
too,#rnI,IWO
a Notary Public for the State of
County of
do hereby certify that personally appeared before me this _
day of , and acknowledge the due execution of the forgoing swale maintenance,requirements
Witness my hand,and official seal,
Notary signature
SEAL
My commission expires -
Form SW401 -Low Density-Rev-3 2 /10/09 Page 4 of 4

Attachment A
This project is to provide for the grouting of the existing 36 inch reinforced concrete pipe
that drains a 6 acre drainage area just upstream of the existing'Secondary-Ash Basin at
Dan River Steam Station in Eden, 'North Carolina. The impacts to the stream include
the installation of the cofferdam for the grout installation, and the temporary inundation
of the wetlands following storm events. Calculations indicate that the wetland area can
store the 25 -year storm event up to elevation 515.9 without discharge. Pumping
capacity currently provided ;allows for the temporarily impounded water to be drawn_
back down within 72',hours of the, storm event. Pumped flows will be discharged to the
active Seconday Ash Basin and ultimately outfall to the Dan River through the outfall
structure.at NPDES outFall 002

M
rM
110 cz
U.S. Fish and Wildlife Service
Trust Resources List
This resource list is to be used for planning purposes only — it is not an official species list.
Endangered Species Act species list information for your project is available online and listed below for
the following FWS Field Offices:
Raleigh Ecological Services Field Office
POST OFFICE BOX 33726
RALEIGH, NC 27636
(919) 856 -4520
Project Name:
Duke Dan River
07/02/2014 Information, Planning, and Conservation System (IPAC) Page 1 of 6
Version 1.4

7m 811t�� IC L=
i
.a
U.S. Fish and Wildlife Service
Project Location Map:
Ilk
Y�
<,: ►� "-
1
bbb.. w
Project Counties:
Rockingham, NC
Trust Resources List
Geographic coordinates (Open Geospatial Consortium Well -Known Text, NAD83):
MULTIPOLYGON (((- 79.7172516 36.4909193, - 79.7172098 36.4920269, - 79.7155575 36.4920442,
- 79.7155779 36.4909056, - 79.7172516 36.4909193)))
Project Type:
Power Generation
07/02/2014 Information, Planning, and Conservation System (IPAC) Page 2 of 6
Version 1.4

r= �
�O M
U.S. Fish and Wildlife Service
Trust Resources List
Endangered Species Act Species List (USFWS Endangered Species Program).
There are a total of 2 threatened or endangered species on your species list. Species on this list should be considered in an effects
analysis for your project and could include species that exist in another geographic area. For example, certain fishes may appear on
the species list because a project could cause downstream effects on the species. Critical habitats listed under the Has Critical
Habitat column may or may not lie within your project area. See the Critical habitats within your project area section below for critical
habitat that lies within your project area. Please contact the designated FWS office if you have questions.
Species that should be considered in an effects analysis for your project:
Clams
Status
Has Critical Habitat
Contact
James spinymussel
Endangered
specie s
Raleigh Ecological
(Pleurobema collina)
info
Services Field Office
Population: Entire
Flowering Plants
Smooth coneflower
Endangered
species
Raleigh Ecological
(Echinacea laevigata)
info
Services Field Office
Critical habitats within your project area:
There are no critical habitats within your project area.
FWS National Wildlife Refuges (IISFWS National Wildlife Refuges �Program ).
There are no refuges found within the vicinity of your project.
FWS Migratory Birds (USFWS Migratory Bird Program).
The protection of birds is regulated by the Migratory Bird Treaty Act (MBTA) and the Bald and Golden Eagle
Protection Act (BGEPA). Any activity, intentional or unintentional, resulting in take of migratory birds,
including eagles, is prohibited unless otherwise permitted by the U.S. Fish and Wildlife Service (50 C.F.R. Sec.
10.12 and 16 U.S.C. Sec. 668(a)). The MBTA has no provision for allowing take of migratory birds that may be
unintentionally killed or injured by otherwise lawful activities. For more information regarding these Acts see
htt2: / /www.fws.2ov /mi rg atorybirds /Re2ulationsandPolicies.html.
07/02/2014 Information, Planning, and Conservation System (IPAC) Page 3 of 6
Version 1.4

Blrak[ A lVi4DLIPS
SBRVlCB
U.S. Fish and Wildlife Service
Trust Resources List
All project proponents are responsible for complying with the appropriate regulations protecting birds when
planning and developing a project. To meet these conservation obligations, proponents should identify potential
or existing project- related impacts to migratory birds and their habitat and develop and implement conservation
measures that avoid, minimize, or compensate for these impacts. The Service's Birds of Conservation Concern
(2008) report identifies species, subspecies, and populations of all migratory nongame birds that, without
additional conservation actions, are likely to become listed under the Endangered Species Act as amended (16
U.S.0 1531 et seq.).
For information about Birds of Conservation Concern, go to
http: / /www.fws. og v /mi rg ator ybirds/ CurrentBirdIssues /Manayement/BCC.html.
Migratory birds of concern that may be affected by your project:
There are 5 birds on your Migratory birds of concern list. The Division of Migratory Bird Management is in the process of
populating migratory bird data with an estimated completion date of August 1, 2014; therefore, the list below may not include all
the migratory birds of concern in your project area at this time. While this information is being populated, please contact the Field
Office for information about migratory birds in your project area.
Species Name
Bird of Conservation
S p e c i e s
Seasonal Occurrence in
Concern (BCC)
Profile
Project Area
Brown - headed Nuthatch (Sitta
Yes
species info
Year -round
pusilla)
Least Bittern (Ixobrychus exilis)
Yes
species info
Breeding
Rusty Blackbird (Euphagus
Yes
species info
Wintering
carolinus)
Wood Thrush (Hylocichla
Yes
species info
Breeding
mustelina)
Worm eating Warbler (Helmitheros
Yes
species info
Breeding
vermivorum)
NWI Wetlands (USFWS National Wetlands Inventory).
The U.S. Fish and Wildlife Service is the principal Federal agency that provides information on the extent and
status of wetlands in the U.S., via the National Wetlands Inventory Program (NWI). In addition to impacts to
wetlands within your immediate project area, wetlands outside of your project area may need to be considered
in any evaluation of project impacts, due to the hydrologic nature of wetlands (for example, project activities
may affect local hydrology within, and outside of, your immediate project area). It may be helpful to refer to
07/02/2014 Information, Planning, and Conservation System (IPAQ Page 4 of 6
Version 1.4

ssmncs
U.S. Fish and Wildlife Service
Trust Resources List
the USFWS National Wetland Inventory website. The designated FWS office can also assist you. Impacts to
wetlands and other aquatic habitats from your project may be subject to regulation under Section 404 of the
Clean Water Act, or other State /Federal Statutes. Project Proponents should discuss the relationship of these
requirements to their project with the Regulatory Program of the appropriate U.S. Army Corps of Engineers
District.
Data Limitations, Exclusions and Precautions
The Service's objective of mapping wetlands and deepwater habitats is to produce reconnaissance level
information on the location, type and size of these resources. The maps are prepared from the analysis of high
altitude imagery. Wetlands are identified based on vegetation, visible hydrology and geography. A margin of
error is inherent in the use of imagery; thus, detailed on- the - ground inspection of any particular site may result
in revision of the wetland boundaries or classification established through image analysis.
The accuracy of image interpretation depends on the quality of the imagery, the experience of the image
analysts, the amount and quality of the collateral data and the amount of ground truth verification work
conducted. Metadata should be consulted to determine the date of the source imagery used and any mapping
problems.
Wetlands or other mapped features may have changed since the date of the imagery and/or field work. There
may be occasional differences in polygon boundaries or classifications between the information depicted on the
map and the actual conditions on site.
Exclusions - Certain wetland habitats are excluded from the National mapping program because of the
limitations of aerial imagery as the primary data source used to detect wetlands. These habitats include
seagrasses or submerged aquatic vegetation that are found in the intertidal and subtidal zones of estuaries and
nearshore coastal waters. Some deepwater reef communities (coral or tuberficid worm reefs) have also been
excluded from the inventory. These habitats, because of their depth, go undetected by aerial imagery. .
Precautions - Federal, state, and local regulatory agencies with jurisdiction over wetlands may define and
describe wetlands in a different manner than that used in this inventory. There is no attempt, in either the design
or products of this inventory, to define the limits of proprietary jurisdiction of any Federal, state, or local
government or to establish the geographical scope of the regulatory programs of government agencies. Persons
intending to engage in activities involving modifications within or adjacent to wetland areas should seek the
advice of appropriate federal, state, or local agencies concerning specified agency regulatory programs and
proprietary jurisdictions that may affect such activities.
The following wetland types intersect your project area in one or more locations:
Wetland Types NWI Classification Code Total Acres
07/02/2014 Information, Planning, and Conservation System (IPAQ Page 5 of 6
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( =ate M U.S. Fish and Wildlife Service
was
o Trust Resources List
Freshwater Pond PUBHx 19.3388 771
07/02/2014 Information, Planning, and Conservation System (IPAC) Page 6 of 6
Version 1.4

Homewood, Sue
From: Bailey, David E SAW <[e-mail]>
Sent: Wednesday, August 13, 2014 4:20 PM
To: Cahoon, Steve
Cc: Homewood, Sue
Subject: Request for Additional Information: proposed pipe closure, Duke Energy Dan River
Steam Station,Eden, Rockingham Co., NC; SAW -2014-01477 (UNCLASSIFIED)
Classification: UNCLASSIFIED
Caveats: NONE
Mr. Cahoon,
Thank you for your PCN and attached plans, received 7/7/2014, for the above referenced
project. I have reviewed the information and additional information/revision is needed prior
to considering your application complete. Please see the comments and questions below and
submit the requested information (via e-mail is fine) within 30 days of receipt of this
Notification; otherwise we may deny verification of the use of the Nationwide Permit or
consider your application withdrawn and close the file:
1) Your current proposal results in inundation of Waters of the US, including both
wetlands and streams, occurring as indirect impacts to the proposed regulated
activity. However, we do not consider dewatering via indefinite pumping sufficient
reason to consider the impacts temporary. As such, as currently proposed, the project
would result in permanent impacts to wetlands and streams subject to inundation (i.e.
permanent conversion of Waters type - wetland and stream to open water). One possible
way to avoid permanent impacts to Waters of the US and show avoidance and minimization
would be to route flow from the wetland/stream area via gravity pipe or ditch to
another Water of the US.
2) Your current proposal would pump/re-route inundated water in the impact area to the
secondary ash basin, which is not a Water of the US. It is possible that this action,
if permanent, would render the wetland/stream area in question as non -jurisdictional by
severing its nexus with the Dan River. If this is the case, we would consider the
entire wetland/stream complex in question a loss of Waters of the US.
3) Please review the above information with respect to your PCN and offer a permanent
solution to handling the flow from Waters of the US resulting from plugging the 36 inch
pipe. If you instead propose to fill in the wetland/stream complex, please note that
you must justify these actions in terms of avoidance and minimization as well as
practicability of alternatives. Note also that wetland impacts > 0.1 acre will require
compensatory mitigation per Nationwide Permit Condition 23.
Please let me know if you have any questions.
Sincerely,
Dave Bailey
David E. Bailey
Project Manager
1

US Army Corps of Engineers
CE -SAW -RG -R
3331 Heritage Trade Drive, Suite 105
Wake Forest, North Carolina 27587
Phone: [phone], Ext. 30.
Fax: [phone]
Email: David.E.Bailey2(@usace.army.mil
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Classification: UNCLASSIFIED
Caveats: NONE
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