20150610 Ver 4_Individual_20190218

U.S. Almy Carps of Engineers (USACE)
Fon„ Approved -
APPLICATION FOR DEPARTMENT OF THE ARMY PERMIT
OMB No. 0710-0003
33 CFR 325. The proponent agency is CECW-CO-R.
Expires 01-08-2018
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PRIVACY ACT STATEMENT
Authorities: Rivers and Harbors Act, Section 10, 33 USC 403; Clean Water Act, Section 404, 33 USC 1344; Marine Protection, Research, and Sanctuaries Act,
Section 103, 33 USC 1413; Regulatory Programs of the Corps of Engineers; Final Rule 33 CFR 320-332. Principal Purpose: Information provided on this form
will be used in evaluating the application for a permit. Routine Uses: This information may be shared with the Department of Justice and other federal, state, and
local government agencies, and the public and may be made available as part of a public notice as required by Federal law. Submission of requested Information
is voluntary, however, if information is not provided the permit application cannot be evaluated nor can a permit be issued. One set of original drawings or good
reproducible copies which show the location and character of the proposed activity must be attached to this application (see sample drawings and/or instructions)
and be submitted to the District Engineer having jurisdiction over the location of the proposed activity. An application that is not completed In full will be returned.
System of Record Notice (SORN). The information received is entered into our permit tracking database and a SORN has been completed (SORN #A1 1145b)
and maybe accessed at the following website:id S4Fil4-{�niwlp- i?W:± G! rr� a7 1i11�'�3 L6 R5v
(ITEMS 1 THRU 4 TO BE FILLED BY THE CORPS)
1. APPLICATION NO.
2. FIELD OFFICE CODE 3. DATE RECEIVED
14. DATE APPLICATION COMPLETE
(ITEMS BELOW TO BE FILLED BYAPPUCA"
5. APPLICANTS NAME
8. AUTHORIZED AGENTS NAME AND TITLE (agent is not required)
First - Steve Middle - Last - Cahoon
First - Richard Middle - Last - Harmon
Company - Duke Energy
Company - Wood Environment & Infrastructure, Inc.
E-mail Address - [e-mail]
E-mail Address - [e-mail]
6. APPLICANTS ADDRESS:
9. AGENTS ADDRESS:
Address- 411 Fayetteville Street -Mail Code: NC l4
Address- 4021 Stirrup Creek Drive, Suite 100
City - Raleigh State - NC Zip - 2760 Country - USA
City - Durham State - NC Zip - 2770 Country -USA
7. APPLICANTS PHONE NOs. WAREA CODE
10. AGENTS PHONE NOs. w/AREA CODE
a. Residence b. Business c. Fax
a. Residence b. Business c. Fax
NA 919-546-7457 919-5464409
NA 919-381-1366 919-381-9901
STATEMENT OF AUTHORIZATION
11. 1 hereby authorize, Wood to act In my behalf as my agent in the processing of this application and to fumish, upon request,
supplemental information in support of this permita pllcati
SIGNATURE OF APPLICANT DAT
NAME, LOCATION, AND DESCRIPTION OF PROJECT OR ACTMTY
12. PROJECT NAME OR TITLE (see instructions)
Individual Permit Modification - Dan River Station Stormwatcr Diversion Proicct and Ash Basin Closure Proiect
13. NAME OF WATERBODY, IF KNOWN (if applicable)
14. PROJECT STREET ADDRESS (if applicable)
Dan River
Address 900 South Edgewood Road
15. LOCATION OF PROJECT
36.490687 -79.720981
Latitude: •N Longitude: •W
city - Eden State- NC zip- 27288
16. OTHER LOCATION DESCRIPTIONS, IF KNOWN (see instructions)
Stale Tax Parcel ID 7989-08-88-6870-00 Municipality Rockingham County
Semon - NA Township - NA Range - NA
ENG FORM 4345, MAY 2018 PREVIOUS EDITIONS ARE OBSOLETE. Page 3 of 1

17. DIRECTIONS TO THE SITE
From Greensboro (I40), take Ohenry Blvd N (-7mi.); Ohenry Blvd N becomes US -29 N (--I6mi.).
Take US -158 exit toward Reidsville/Eden/NC-14/Yanceyville (--0.3mi.).
Turn left onto US -158 W (--2.5mi.).
Stay straight to go onto NC -14; continue to follow NC -14 (--9.5mi.).
Turn right onto E Stadium Dr (--1.3mi.).
Turn right onto S Edgewood Rd (—I mi.); arrive at guard shack.
18. Nature of Activity (Description of project, include all features)
As permitted by the USACE Individual Permit (SAW -2015-01381, issued October l2, 2017), the Stormwater Diversion Project and
Associated Projects comprised five individual projects at the Dan River Station: Stormwater Diversion Project, 36 -inch Pipe Closure Project,
48 -inch Pipe Closure Project, DR] 34 Project, and DR131 Project. Information on the aforementioned five projects was originally presented
in the April 28, 2017 Wetland Master Plan prepared by Wood (formerly Amec Foster Wheeler) for the USACE IP application. To be in
compliance with the Coal Ash Management Act, Duke Energy is in the process of excavating and transporting coal ash to the on-site Dan
River Landfill. Furthermore, it is necessary to implement modifications to the Stormwater Diversion Project. The IP modification primarily
includes the Ash Basin Closure action. This action will entail the closure and grading (and seeding) of the Primary and Secondary Ash
Basins (PAD and SAB). The existing embankment that extends along the southern boundary of the two ash basins will be removed.
Stormwater will be routed across the historical footprint of the PAB and SAB via piping and rip -rap lined channels, with outfall at four
gabion locations (established along the northern bank of Dan River).
19. Project Purpose (Describe the reason or purpose of the project, see instructions)
The purpose of the Stormwater Diversion Project and Associated Projects (as permitted under USACE SAW -2015-01381) was to divert
stormwater to facilitate the excavation and disposal of Coal Combustion residual (CCR) materials from areas of ash fill within the Dan River
Steam Station. The purpose was based on the following needs: (1) Address North Carolina regulatory requirements related to diverting
stormwater away from the PAB and SAB, and disposal of CCR materials; (2) Provide separation between water that has contacted CCR
material (contact water) and water that has not contacted CCR material (non -contact water); and (3) Increase safety by improving site access.
The proposed activities for the IP modification are necessary to meet the requirements set forth under CAMA. With respect to the Ash Basin
Closure action, the project purpose is to close the PAB and SAB. This action will include the excavation of ash from the basins and the
subsequent grading and seeding of these areas.
USE BLOCKS 20.23 IF DREDGED ANWOR FILL MATERIAL IS TO BE DISCHARGED
20, Reason(s) for Discharge
The Ash Basin Closure action will result in a total of 0.025 acre of permanent impacts to open waters (i.e., Dan River) from the
establishment of the four gabion structures. These open water impacts were calculated to the Ordinary High Water Mark elevation and not
the I00 -year floodplain elevation. The 0.025 -acre total impact is presumed to be less than substantial, as the impact area associated with the
construction (footprint) of each gabion will be limited to a very small work area. A total of 0.125 acre of temporary impacts to open waters
will occur from the construction corridor established at the gabion locations. The project will also entail pipe construction at the previously
permitted 36 -Inch Pipe Closure Project area, 48 -Inch Pipe Closure Project area, and at Wetland A - Stormwater Diversion Project. The pipe
construction may also require localized grading to a depth of 18 inches or less below existing grade to remove CCR material (if any), from
the wetland areas at these projects, and to promote drainage. Permanent wetland impacts (impoundment) were previously permitted.
21. Type(s) of Material Being Discharged and the Amount of Each Type in Cubic Yards:
Type Type Type
Amount in Cubic Yards Amount in Cubic Yards Amount in Cubic Yards
1,421 (grading for CCR exc. from wetlands)
22. Surface Area in Acres of Wetlands or Other Waters Filled (see instructions)
Acres 0.025 acre permanent impact to open waters (Dan River) (0.125 acre temporary impact) - for the construction of four gabion
or
Linear Feet NA
23. Description of Avoidance, Minimization, and Compensation (see instructions)
No CCR contact water will be discharged into jurisdictional wetlands and streams; therefore, the water quality of downstream receiving
waters, specifically the Dan River, will not be impaired. All work activities to be completed under the proposed IP modification will be
conducted in a manner to minimize the potential for erosion and sedimentation. Best management practices will be used pursuant to Erosion
& Sediment Control (E&SC) Plan guidelines. No compensatory mitigation is proposed for the 0.025 acre of permanent impacts and 0.125
acre of temporary impacts to open waters (Dan River) under the Ash Basin Closure action, as specifically occurring from the construction of
the four gabion structures.
ENG FORM 4345, MAY 2018 Page 3 of 2

24. Is Any Portion of the Work Already Complete? nYes n No IF YES, DESCRIBE THE COMPLETED WORT(
Ash deposits have been excavated from the FAB and SAB; this activity is ongoing. The excavated material is being transported to the Dan
River Landfill.
25. Addresses of Adjoining Property Owners, Lessees, Etc., Whose Property Adjoins the Waterbody of mora man can be entered here. please attach a supplemental tkati.
a. Address- See attached list of adjoining property owners
City - Stale - Zip -
b. Address -
City - State - Zip -
c. Address -
City - Stale - Zip -
d. Address -
City - Stale - Zip -
e. Address -
City - State - Zip -
26. List of Other Certificates or Approvals/Denials received from other Federal, State, or Local Agencies for Work Described in This Application.
AGENCY TYPE APPROVAL" IDENTIFICATION DATE APPLIED DATE APPROVED DATE DENIED
NUMBER
USACE
NCDEQ - DWR
Individual Permit SAW -2015-01381 2017-04-28
Individual 401 WQC DWR# 20150610 v3 2017-04-28
• Would include but is not restricted to zoning, building, and flood
2017-10-I2
2017-10-09
27. Application is hereby made for permit or permits to authorize the work described in this application. I certify that this information in this application is
complete and accurate. I further certify that I possess the authority to undertake the work described herein or am acting as the duly authorized agent of the
applicant. /!J
SIGNATURE OF APPLICANT 7 DA SIGNATURE OF AGENT DATE
The Application must be signed by the person who desires to undertake the proposed activity (applicant) or it may be signed by a duly
authorized agent if the statement in block 11 has been filled out and signed.
18 U.S.C. Section 1001 provides that: Whoever, in any manner within the jurisdiction of any department or agency of the United States
knowingly and willfully falsifies, conceals, or covers up any trick, scheme, or disguises a material fact or makes any false, fictitious or fraudulent
statements or representations or makes or uses any false writing or document knowing same to contain any false, fictitious or fraudulent
statements or entry, shall be fined not more than $10,000 or Imprisoned not more than five years or both.
ENG FORM 4345, MAY 2018 Page 3 of 3

wood.
Duke Energy Dan River Plant
Section 404 Individual Permit Modification Support
Dan River Plant Stormwater Diversion Project
Ash Basin Closure
Permit Support
USACE Action ID SAW -2015-01381
NCDWQ ID WQC004126
Prepared for:
DUKE
ENERGY,.
Dan River Plant
Eden, North Carolina
Prepared by:
Wood Environment & Infrastructure Solutions, Inc.
4021 Stirrup Creek Drive, Suite 100
Durham, North Carolina
February 15, 2019
Project No. 7810150290

Wetland Master Plan — Permit Support
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
TABLE OF CONTENTS
Paqe
LIAT070ne,
It
EXECUTIVE SUMMARY........................................................................................................... iv
1.0 INTRODUCTION............................................................................................................ 1
2.0 PROJECT PURPOSE AND NEED................................................................................. 1
3.0 PROJECT DEVELOPMENT........................................................................................... 4
3.1 STORM WATER DIVERSION PROJECT............................................................. 4
3.2 36 -INCH PIPE CLOSURE PROJECT................................................................... 5
3.3 48 -INCH PIPE CLOSURE PROJECT................................................................... 6
3.4 ASH BASIN CLOSURE ACTION.......................................................................... 6
4.0 ALTERNATIVES ANALYSIS.......................................................................................... 4
5.0
WATERS OF THE U.S. IMPACTS................................................................................. 8
5.1
STORM WATER DIVERSION PROJECT.............................................................
9
5.2
36 -INCH PIPE CLOSURE PROJECT..................................................................11
5.3
48 -INCH PIPE CLOSURE PROJECT..................................................................11
5.4
ASH BASIN CLOSURE ACTION.........................................................................12
5.5
BEST MANAGEMENT PRACTICES....................................................................13
5.6
NPDES PROJECTS AT DAN RIVER PLANT......................................................13
6.0
COMPENSATORY MITIGATION..................................................................................14
6.1
STORMWATER DIVERSION PROJECT.............................................................14
6.2
36 -INCH PIPE CLOSURE PROJECT..................................................................16
6.3
48 -INCH PIPE CLOSURE PROJECT..................................................................16
6.4
ASH BASIN CLOSURE ACTION.........................................................................17
7.0
PROTECTED SPECIES................................................................................................18
7.1
BACKGROUND...................................................................................................18
7.2
AFFECTED ENVIRONMENT...............................................................................18
8.0
CULTURAL RESOURCES............................................................................................20
8.1
BACKGROUND...................................................................................................20
8.2
AFFECTED ENVIRONMENT...............................................................................20

Wetland Master Plan - Permit Support
Dan River Plant Ash Basin Closure wood.
Rockingham County, North Carolina
Project No. 7810150290
LIST OF TABLES
Table 1 Previously Permitted impacts to jurisdictional wetlands, streams, and dredge
basin for the Stormwater Diversion Project, 36 -Inch Pipe Closure Project, and 48 -
Inch Pipe Closure Project, Dan River Plant, Rockingham County, North Carolina
Table 2 Proposed impacts to jurisdictional open waters (Dan River), Ash Basin Closure
Action, Dan River Plant, Rockingham County, North Carolina
Table 3 Mitigation costs for impacts to waters of the U.S., Stormwater Diversion Project,
36 -Inch Pipe Closure Project, and 48 -Inch Pipe Closure Project, Dan River Plant,
Rockingham County, North Carolina
Table 4 Identified archaeological sites within a half -mile radius or vicinity of the Dan River
Plant, Rockingham County, North Carolina
LIST OF FIGURES
Figure 1 General Location of Ash Basin Closure and Associated Projects, Dan River
Plant, Rockingham County, North Carolina
Figure 2 Location of Proposed Work Areas and Project Components, Dan River Plant,
Rockingham County, North Carolina
LIST OF APPENDICES
Appendix A
Plan View and Cross -Section Permit Drawings
Appendix B
NCNHP Database Search Query
Appendix C
Adjacent Landowner Information

Wetland Master Plan — Permit Support
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
EXECUTIVE SUMMARY
wood.
As permitted by the U.S. Army Corps of Engineers (USACE) (Individual Permit SAW -2015-
01381), the Stormwater Diversion Project and Associated Projects comprised five individual
projects at the Dan River Plant, Rockingham County. The five projects included the following:
Stormwater Diversion Project, 36 -inch Pipe Closure Project, 48 -inch Pipe Closure Project, Dan
River 134 Project, and Dan River 131 Project. To be in compliance with the Coal Ash
Management Act (CAMA), Duke Energy has transported coal ash from the station to an existing
lined landfill in Jetersville, Virginia, and is in the process of excavating and transporting the
remaining coal ash to the on-site Dan River Landfill. The excavation and disposal of coal
combustion residual (CCR) materials entailed the diversion of stormwater to facilitate these
actions. The Stormwater Diversion Project was vital to comply with state and federal
regulations, included the separation of contact and non -contact water, and improved site
safety. The Stormwater Diversion Project required stream and wetland impacts by
necessity.
This information, with additional content, was originally presented in the April 28, 2017, Wetland
Master Plan (WMP) prepared by Wood Environment & Infrastructure Solutions, Inc. as
supporting documentation for the USACE Individual Permit (IP) application package for the
Stormwater Diversion Project and Associated Projects. The USACE issued the IP (SAW -2015-
01381) on October 12, 2017, to authorize the proposed impacts to jurisdictional wetlands and
streams. The DWR issued Individual 401 Water Quality Certification on October 9, 2017
(WQC004126).
Following permit issuance, it became necessary to develop and implement modifications to the
Stormwater Diversion Project and Associated Projects. No substantial changes to the following
project -related resources (affected environment) will occur under the proposed activities for the
IP modification: land use, geology, soils, groundwater, protected species, cultural resources,
environmental justice, noise, and air quality. Changes to topography and floodplains will occur
under the proposed activities for the IP modification. No changes to the DR 134 Project or the
DR 131 Project are anticipated under the proposed activities for the IP modification; therefore,
neither project is discussed in this Addendum report. No action alternatives are presented in the
Addendum for the proposed activities with the IP modification, as no substantial change in the
overall purpose and need will occur. The proposed activities for the IP modification are
necessary to meet the requirements set forth under CAMA. Furthermore, the No -Build
Alternative is not feasible with regard to CAMA compliance.
Under the proposed IP modification, the stormwater divider berm and five pipe lines will be
removed upon completion of CCR unit closure. The footprint of the stormwater divider berm and
WSA-1 (Water Supply Area) will be regraded to promote gravity drainage to an existing
reinforced concrete pipe (RCP) which is located at the southern edge of WSA-1. The RCP will
convey flow from the historical WSA-1 area to the historical ash basin footprint. For the 36 -inch
li

Wetland Master Plan — Permit Support
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
wood.
Pipe Closure Project, the area impounded by the pipe closure area is also defined as WSA-2 in
the Stormwater Diversion Project. During CCR unit closure, the WSA-2 footprint will be re-
graded to remove accumulated CCR material (if any) and to promote drainage to the existing
pipe. The pipe plug will be removed to restore flow from the historical WSA-2 area to the
historical ash basin footprint. For the 48 -inch Pipe Closure Project, the pipe closure area will be
re -graded during CCR unit closure to promote drainage to a proposed pipe. The proposed pipe
will convey flow from the historical 48 -inch pipe closure area to the historical ash basin footprint.
The Ash Basin Closure action will entail the closure and grading of the PAB and SAB. The
decommissioning of these two ash basins is necessary for compliance with CAMA. Ash will be
removed from the PAB and SAB. The existing embankment features that extend along the
southern boundary of the two basins will be removed. After the removal of ash, the two basins
will be graded and planted with a grass seed mix. Four gabions, constructed of woven steel wire
mesh and filled with rocks, will be established along the northern bank of the Dan River during
this action. The gabions, by their design, will reduce erosion at these four outfall locations along
the Dan River. Stormwater will be routed (i.e., concentrated flow) across the historical footprint
of the PAB and SAB via piping and rip -rap lined channels, with outfall at the four gabion
locations.
Under the proposed activities for the IP modification, a change in topography will occur with the
removal of the existing embankment that extends along the southern boundary of the two ash
basins. However, the embankment is an artificial feature, historically constructed from the
placement of fill material. Grading in the floodplain and the removal of the embankment will
result in an impact to the 100 -year floodplain. The proposed action will not increase flood
heights and a "no -rise" scenario is presumed. The project will be reviewed by the City of Eden
(Floodplain Administrator) and the required certification (s) will be obtained prior to the initiation
of construction activities. The removal of the embankment and the residual ash deposits will
improve flood storage capacity.
No changes in impacts to jurisdictional wetlands and streams for the Stormwater Diversion
Project are proposed under the IP modification. Specifically, the re -grading of the stormwater
divider berm and WSA-1 (dredge basin) will not extend beyond the footprint of these features,
as inclusive of the jurisdictional waters that encompass the features and the associated
previously permitted impacts. No changes in impact size/extent to jurisdictional wetlands and
streams for the proposed action are proposed under the IP modification. The regrading of the
project areas will not extend beyond the footprint of these features, as inclusive of the
jurisdictional waters that encompass the features and the associated, previously permitted,
permanent impacts. The only change will be in the type of impact; i.e., from impoundment of the
jurisdictional areas to regrading of the jurisdictional areas. The Ash Basin Closure action will
result in a total of 0.025 acre of permanent impacts to open waters (i.e., Dan River) from
the establishment of the four gabion structures. These open water impacts were calculated to
the Ordinary High Water Mark elevation and not the 100 -year floodplain elevation. The 0.025 -
acre total impact is presumed to be less than substantial, as the impact area associated with the
W

Wetland Master Plan — Permit Support
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
wood.
construction (footprint) of each gabion will be limited to a very small work area. A total of 0.125
acre of temporary impacts to open waters will occur from the construction corridor
established at the gabion locations. All work activities to be completed under the proposed IP
modification will be conducted in a manner to minimize the potential for erosion and
sedimentation and will conform to Erosion & Sediment Control Plan details.
As no changes in impacts to jurisdictional wetlands and streams are proposed under the IP
modification for the proposed actions, no adjustments in compensatory mitigation are necessary
as originally permitted.
A records search to identify documented federally protected species (threatened or
endangered) which have elemental occurrences in Rockingham County reported no element
occurrences of federally listed species within a one -mile radius of the station. It is presumed
that the proposed action would have no effect on the James spinymussel and its habitat.
u

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
1.0 INTRODUCTION
wood.
As permitted by the U.S. Army Corps of Engineers (USACE) (Individual Permit [IP] SAW -2015-
01381), the Stormwater Diversion Project and Associated Projects comprised five individual
projects at the Dan River Plant, located near the southeastern side of the City of Eden in
northern Rockingham County. The five projects are identified below:
• Stormwater Diversion Project
• 36 -inch Pipe Closure Project
• 48 -inch Pipe Closure Project
• Dan River 134 Project
• Dan River 131 Project
Among these five projects, the principal project was the Stormwater Diversion Project.
On August 20, 2014, the North Carolina General Assembly passed S 729, the Coal Ash
Management Act of 2014 (CAMA), requiring Duke Energy to phase out wet ash handling. At
the Dan River Plant, Duke Energy transported some of the coal ash from the station to an
existing lined landfill in Jetersville, Virginia. The remaining on-site coal ash is currently in the
process of being excavated and disposed of in the on-site Dan River Landfill.
The excavation and disposal of coal combustion residual (CCR) materials has entailed the
diversion of stormwater to facilitate these actions. Specifically, the stormwater diversion
activities as permitted and implemented, included the removal of ash from an existing
dredge basin, the construction of a soil divider berm, and the construction of five pipelines
to transport water. The method for implementing stormwater diversion incorporated a
pump -around operation. The stormwater diversion measures will remain in place during
excavation and disposal of CCR materials, which is estimated to occur over a period of
three to five years. Stormwater diversion measures will be removed, and gravity flow will
be restored following completion of CCR excavation and disposal activities.
The aforementioned information, with additional content, was originally presented in the April
28, 2017 Wetland Master Plan (WMP) prepared by Wood Environment & Infrastructure
Solutions, Inc. (Wood) (formerly Amec Foster Wheeler Environment & Infrastructure, Inc.), as
supporting documentation for the U.S. Army Corps of Engineers (USACE) Individual Permit (IP)
application package for the Stormwater Diversion Project and Associated Projects at the Dan
River Plant. The IP application package was submitted by Duke Energy to the USACE. During
the IP application review process, which included a 30 -day Public Notice period (May 12, 2017
advertisement), a Request for Additional Information (RAI) was issued by the USACE (July 12,
2017) and the North Carolina Department of Environmental Quality (NCDEQ) Division of Water

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
wood.
Resources (DWR) (June 1, 2017). Responses to the RAls were provided to both agencies by
Duke Energy. After further review by both agencies, the USACE issued the IP (SAW -2015-
01381) on October 12, 2017 to authorize the proposed impacts to jurisdictional wetlands and
streams and the DWR issued Individual 401 Water Quality Certification on October 9, 2017
(WQC004126).
Following the issuance of the IP by the USACE and Water Quality Certification by the DWR, it
has become necessary to develop and implement modifications to the Stormwater Diversion
Project and Associated Projects. Separate from the project, but included in this Addendum
report, is the Ash Basin Closure action. The Ash Basin Closure action will entail the closure and
grading of the PAB and SAB. This Addendum report for the Stormwater Diversion Project and
Associated Projects presents information on the newly proposed activities at the Dan River
Plant, as including project development, proposed impacts to jurisdictional wetlands and
streams, and compensatory mitigation, and as necessary to address the proposed modification
of the issued USACE IP (SAW -2015-01381) and DWR Water Quality Certification
(WQC004126). Figure 1 presents the general location of the Ash Basin Closure action area and
associated projects. Certain information for the Stormwater Diversion Project and Associated
Projects, as originally permitted, was previously presented in the April 2017 WMP, and is not
repeated herein.
No substantial changes to the following project -related resources (affected environment) will
occur under the proposed activities for the IP modification: land use, geology, soils,
groundwater, protected species, cultural resources, environmental justice, noise, and air quality.
Certain figures, tables, and/or appendices related to the topics of discussion are not included
herein but can be found in the April 2017 WMP. Changes to topography and floodplains will
occur under the proposed activities for the IP modification. These changes are discussed in
Section 2.4 herein (Ash Basin Closure Action). Finally, no changes to the DR 134 Project or the
DR 131 Project are anticipated under the proposed activities for the IP modification; therefore,
neither project is discussed in this Addendum report for the Stormwater Diversion Project and
Associated Projects. Please refer to the April 28, 2017 WMP for additional information on the
Stormwater Diversion Project and Associated Projects.
2

Wetland Master Plan - Addendum 1
Dan River Plant Ash Basin Closure wood.
Rockingham County, North Carolina
Project No. 7810150290
2.0 PROJECT PURPOSE AND NEED
The purpose of the Stormwater Diversion Project was to divert stormwater to facilitate the
excavation and disposal of CCR materials from areas of ash fill within the Dan River Plant.
This purpose was based on the following needs:
Address North Carolina regulatory requirements related to diverting stormwater away
from the Primary Ash Basin (PAB) and Secondary Ash Basin (SAB), and disposal of
CCR materials
• Provide separation between water that has contacted CCR material (contact water) and
water that has not contacted CCR material (non -contact water)
• Increase safety by improving site access
The Stormwater Diversion Project was vital to comply with state and federal regulations,
included the separation of contact and non -contact water, and improved site safety. The
project required stream and wetland impacts by necessity. Additional information on the
purpose and need for the Stormwater Diversion Project and Associated Projects, as originally
permitted, was previously presented in the April 2017 WMP, and is not repeated herein.
The principal action that has accelerated the excavation and removal of CCR materials from
coal ash storage ponds (ash basins) at Duke Energy power generating plants with coal-fired
facilities is the promulgation of CAMA. The bill, enacted on August 20, 2014, requires Duke
Energy to phase out wet ash handling. In conjunction with CAMA, the NCDEQ has amassed
comprehensive data about coal ash facilities statewide. The information has been essential in
NCDEQ's prioritization of closure plans for all 14 facilities with coal ash storage ponds. The Dan
River Plant was identified as one of these 14 facilities with coal ash storage ponds. The Ash
Basin Closure action, as identified in this IP modification, will address North Carolina regulatory
requirements as related to the redirection of process water away from the ash basin and to help
facilitate the closure activities of CCR materials at the steam station. In conclusion, the project
purpose is to close the PAB and SAB. This action will include the excavation of ash from the
basins and the subsequent grading and seeding of these areas. The proposed activities for the
IP modification are necessary (project need) to meet the requirements set forth under CAMA.
3

Wetland Master Plan - Addendum 1
Dan River Plant Ash Basin Closure wood
Rockingham County, North Carolina
Project No. 7810150290
3.0 PROJECT DEVELOPMENT
This chapter of the Addendum Report presents information on the newly proposed activities at
the Dan River Plant for the Stormwater Diversion Project, the 36 -inch Pipe Closure Project, and
the 48 -inch Pipe Closure Project, as originally presented in the April 2017 WMP and permitted
by the USACE and DWR, and as developed under the proposed IP modification. Information or
the Ash Basin Closure action is also presented in this chapter. Figure 2 presents the location of
the proposed work areas for the Ash Basin Closure action and associated project components.
3.1 STORM WATER DIVERSION PROJECT
Project as Permitted by USACE and DWR
The Stormwater Diversion Project components included the following: divider berm; upland flow
area (UFA); three water storage areas (WSA), including WSA-1, WSA-2, and WSA-3; and five
Pipe Lines, including Pipe Lines 1, 2, 3, 4 and 5. The Project must adhere to federal and state
water quality standards during the diversion of stormwater. Therefore, the Project was designed
to provide separation between water that has contacted CCR material (contact water) and water
that has not contacted CCR material (non -contact water). Specifically, a divider berm was
constructed to provide separation of contact and non -contact water during CCR removal
activities. The stormwater diversion activities entailed the removal of ash from an existing
dredge basin (located between the current footprints of Ash Fill 1 and Ash Fill 2), the
construction of a soil divider berm, and the construction of five pipelines. The diversion of
stormwater was a significant element of the overall process to excavate and remove CCR
materials from the Dan River Plant.
The diversion of stormwater entailed a pump -around method, at a capacity of 400 gallons per
minute (gpm). The wetland impact associated with the development of WSA-2 (0.11 acre) was
previously permitted by the USACE. The wetland impact associated with the development of
WSA-3 (0.19 acre) was authorized by the issued USACE IP. In addition, the impact to the
dredge basin (1.89 acres) associated with the development of WSA-1 was authorized by the
issued USACE IP. For the remaining Project component, the UFA, the impacts due to the
overflooding of this area included 0.22 acre of wetlands and 393 linear feet of stream. All
permanent impacts to jurisdictional wetlands, streams, and the dredge basin under the pump -
around method were authorized by the issued USACE IP.
Project under the Proposed IP Modification
The stormwater divider berm and five pipe lines will be removed upon completion of CCR unit
closure. The footprint of the stormwater divider berm and WSA-1 will be re -graded to promote
gravity drainage to an existing reinforced concrete pipe (RCP) which is located at the southern
4

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
wood.
edge of WSA-1. The RCP will convey flow from the historical WSA-1 area to the historical ash
basin footprint.
With regard to Wetland A (WSA-3), which was previously included in the Stormwater Diversion
Project, gravity drainage will be restored by removing the temporary pipe cap. The work may
also require re -grading to a depth of 18 inches or less below existing grade to remove
accumulated CCR material (if any) and to promote drainage, and/or headwall.
3.2 36 -INCH PIPE CLOSURE PROJECT
Prosect as Permitted by USACE
The 36 -Inch Pipe Closure Project is a previously permitted project at the Dan River Plant.
The USACE issued Action ID SAW -2014-01477 on September 29, 2014, for Nationwide Permit
(NWP) 18. The issued NWP 18 (Minor Discharges) authorized wetland and stream impacts
(permanent) resulting from overflooding. The project activities entailed closing (grouting) a 36 -
inch corrugated metal pipe that transported flow under the PAB. The impacts to jurisdictional
waters also included the establishment of a cofferdam for the grout installation. Pumped
flows were discharged to the Dan River through the outfall structure at National Pollutant
Discharge Elimination System (NPDES) outfall 002. Although the project was previously
permitted under NWP, the proposed action will not be completed prior to the close out of the
ash basins and the expiration of the issued NWP; therefore, the impacts to the jurisdictional
waters (i.e., Wetland H and Stream 4) were included in the 2017 USACE IP application and, as
such, included in the issued USACE IP (SAW -2015-01381). Compensatory mitigation for the
wetland and stream impacts were also included in the 2017 USACE IP application. Please
refer to the April 28, 2017 WMP for information on this permitted project. The project purpose
entailed the closing (grouting) of the 36 -inch corrugated metal pipe that transported flow under
the PAB. The proposed action was necessary to accomplish the clean-up of ash.
Project under the Proposed IP Modification
The area impounded by the 36 -inch pipe closure area is also defined as WSA-2 in the
Stormwater Diversion Project. During CCR unit closure, the WSA-2 footprint will be re -graded to
a depth of 18 inches or less below existing grade to remove accumulated CCR material (if any)
and to promote drainage to the existing pipe. The pipe plug will be removed to restore flow from
the historical WSA-2 area to the historical ash basin footprint.
5

Wetland Master Plan - Addendum 1
Dan River Plant Ash Basin Closure wood.
Rockingham County, North Carolina
Project No. 7810150290
3.3 48 -INCH PIPE CLOSURE PROJECT
Project as Permitted by USACE
The 48 -Inch Pipe Closure Project is a previously permitted project at the Dan River Plant.
The USACE issued Action ID SAW -2015-01670 on July 31, 2015, for NWP 18. The issued
NWP 18 authorized wetland and stream impacts (permanent) resulting from overflooding. The
project activities entailed the clean-up of ash and the impoundment of stormwater at the grouted
48 -inch reinforced concrete pipe. Pumped flows were discharged to the Service Water
Settling Pond by way of existing piping to a new storm water outfall. Although the project was
previously permitted under NWP, the proposed action will not be completed prior to the close
out of the ash basins and the expiration of the issued NWP; therefore, the impacts to the
jurisdictional waters (i.e., two wetlands and three streams) were included in the 2017 USACE
IP application and, as such, included in the issued USACE IP (SAW -2015-01381).
Compensatory mitigation for the wetland and stream impacts were also included in the
2017 USACE IP application. Please refer to the April 28, 2017 WMP for information on this
permitted project. The project purpose entailed the closing (grouting) of a 48 -inch reinforced
concrete pipe. The proposed action was necessary to accomplish the clean-up of ash.
Prosect under the Proposed IP Modification
During CCR unit closure, the 48 -inch pipe closure area will be re -graded to a depth of 18 inches
or less below existing grade to remove accumulated CCR material (if any) and to promote
drainage to a proposed pipe. The proposed pipe will convey flow from the historical 48 -inch pipe
closure area to the historical ash basin footprint.
3.4 ASH BASIN CLOSURE ACTION
The Ash Basin Closure action will entail the closure and grading of the PAB and SAB. The
decommissioning of these two ash basins is necessary for compliance with CAMA. Ash will be
removed from the PAB and SAB. The existing embankment features that extend along the
southern boundary of the two basins will be removed. After the removal of ash, the two basins
will be graded and planted with a grass seed mix.
Four gabions will be established along the northern bank of the Dan River during the Ash Basin
Closure action. Specifically, Gabions 1 and 2 will occur along the PAB southern boundary,
Gabion 3 at the intersection of the PAB and SAB southern boundaries, and Gabion 4 at the SAB
southern boundary. The locations of the four gabions are presented on the Plan View drawing.
The gabions will be constructed of woven steel wire mesh and filled with rocks. These features
are generally used to form low -height retaining structures or revetment protection works. The
gabions, by their design, will reduce erosion at these four outfall locations along the Dan River.
1.1

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
wood.
Stormwater will be routed (i.e., concentrated flow) across the historical footprint of the PAB and
SAB via piping and rip -rap lined channels, with outfall at the four gabion locations. Permanent
and temporary impacts to jurisdictional open waters (i.e., Dan River) from the construction of
each gabion are discussed in Section 3.4 (Ash Basin Closure Action) of this Addendum report.
A change in topography will occur with the removal of the existing embankment that extends
along the southern boundary of the two ash basins. The change in topography will be
approximately 20 feet, from an approximate elevation of 520 feet to 500 feet post -construction.
However, the embankment is an artificial feature, historically constructed from the placement of
fill material. The change in topography will be limited to the embankment feature regarding the
magnitude of all topographic impacts under the proposed activities for the IP modification within
the steam station.
Based on FEMA FIRM mapping, the embankment occurs within the 100 -year floodplain. The
floodplain elevation near the embankment is approximately 510 feet. Under the proposed
activities for the IP modification, grading in the floodplain and the removal of the embankment,
to an elevation of 500 feet post -construction, will result in an impact to the floodplain. The
proposed action, however, will not increase flood heights and a "no -rise" scenario is presumed.
The project will be reviewed by the City of Eden (Floodplain Administrator) and the required
certification(s) will be obtained prior to the initiation of construction activities. Finally, the removal
of the embankment and the residual ash deposits will improve flood storage capacity.
The 500 -foot elevation mark (i.e., the elevation along the southern boundary of the historic ash
basin footprint following the removal of the embankment) occurs below the floodplain elevation
of 510 feet but above the elevation of the Ordinary High Water Mark (OHWM) (486 feet) near
the four gabion (outfall) locations. The impacts to jurisdictional waters (Dan River) from the
installation of the four gabions were calculated to the OHWM elevation and not the 100 -year
floodplain elevation. These open water impacts are discussed in Section 3.4 (Ash Basin Closure
Action) of this Addendum report.
7

Wetland Master Plan - Addendum 1
Dan River Plant Ash Basin Closure wood.
Rockingham County, North Carolina
Project No. 7810150290
4.0 ALTERNATIVES ANALYSIS
The April 2017 WMP and the response to the July 12, 2017 USACE RAI presented and
addressed the alternatives analysis requirements for the Stormwater Diversion Project and
Associated Projects. As such, information on regulatory authority and alternatives analysis for
the Stormwater Diversion Project and Associated Projects, as originally permitted, is not
repeated herein. Please refer to the WMP for all action alternatives for these permitted projects.
The redirection of process water is a significant element of the overall process to ensure the
long-term integrity of CCR materials and facilitate ash basin closure activities at the Dan River
Plant. The excavation and removal of CCR materials is a function of the promulgation of CAMA.
Therefore, the impetus for the alternatives analysis is linked to this process. The Ash Basin
Closure action is the principal project component under the proposed IP modification. Other
than the No -Build Alternative, no action alternatives are presented herein for the proposed
activities under the IP modification, as no substantial change in the overall purpose and need
will occur. The proposed activities for the IP modification are necessary to meet the
requirements set forth under CAMA. Furthermore, the No -Build Alternative is not feasible
regarding CAMA compliance. If the Ash Basin Closure action is not completed, compliance with
CAMA would not be met.
E:3

Wetland Master Plan - Addendum 1
Dan River Plant Ash Basin Closure wood.
Rockingham County, North Carolina
Project No. 7810150290
5.0 WATERS OF THE U.S. IMPACTS
This section presents information on the impacts to waters of the U.S. at the Dan River Plant for
the Stormwater Diversion Project, the 36 -inch Pipe Closure Project, and the 48 -inch Pipe
Closure Project, as originally presented in the April 2017 WMP and permitted by the USACE
and DWR, and as developed under the proposed IP modification. Some of the content on
jurisdictional waters impacts, as originally presented in the WMP, is not included herein;
therefore, reference should be made to the April 2017 WMP. Information on impacts associated
with the Ash Basin Closure action is also presented in this chapter. Information on impacts to
jurisdictional waters for the DR 131 Project and the DR 134 Project is not discussed herein, as
no changes to these two projects are anticipated under the proposed activities for the IP
modification.
5.1 STORM WATER DIVERSION PROJECT
Prosect as Permitted by USACE and DWR
Wetlands A, D, F, and H, Stream 1, and the dredge basin occurred within the Project area
(inclusive of various Project components) and were affected by the implementation of the pump -
around stormwater diversion operations. Although Wetlands B, C, E, G and J, Streams 2 and 6,
and Pond AA occurred in the general vicinity of the Project components, these waters of the
U.S. were not affected by the stormwater diversion operations. Prior work activities conducted at
WSA-2, as affecting Wetland H, were previously permitted by USACE NWP 18 (Action ID SAW -
2014 -01477, issued on September 29, 2014). The issued NWP 18 authorized impacts
(permanent) to Wetland H resulting from overflooding.
All impacts to waters of the U.S. from the implementation of the stormwater diversion operations
were classified as permanent, as based on prior conversations in 2016 with Mr. David Bailey of
the USACE, Raleigh Regulatory Field Office. The impacts to Wetlands A, D and F, Wetland H
(impacts previously permitted), and Stream 1 were due to overflooding. The construction of the
Project component WSA-1 entailed the removal of vegetation, CCR removal, and regrading to
promote drainage within the existing dredge basin area. Specifically, the cumulative impacts to
the dredge basin area footprint included dredging, cut/fill, and overflooding. The initial impact to
the dredge basin was dredging; i.e., the removal of hydrophytic vegetation, primarily
phragmites, and the excavation of CCR material. The stormwater diversion measures will be in
place during the excavation and disposal of CCR materials, which is estimated to occur over a
period of three to five years. Table 1 presents acreage and linear foot values of the impacts to
jurisdictional wetlands and streams within the respective Project components, as authorized
(i.e., previously permitted) under the issued USACE IP (SAW -2015-01381) and NWP 18 (SAW -
2014 -01477 and SAW -2015-01670). The Plan View drawing of the Project components and the
cross-section drawings of Wetlands A, D and F, Stream 1, and the dredge basin were originally
9

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
L"Arerone,
It
presented in the April 2017 WMP and are not included herein. Reference should be made to the
April 2017 WMP for these drawings.
Table 1. Previously Permitted impacts to jurisdictional wetlands, streams, and dredge
basin for the Stormwater Diversion Project, 36 -Inch Pipe Closure Project, and
48 -Inch Pipe Closure Project, Dan River Plant, Rockingham County, North
Carolina.
Resource Type
Project Component
Permitted Impacts
Wetlands
(acres)
Streams
(linear feet)
Stormwater Diversion Project (permitted under SAW -2015-01381; IP)
Wetland A
WSA-3
0.19
-
Wetland D
UFA
0.16
-
Wetland F
UFA
0.06
-
Stream 1
UFA
-
393
Dredge Basin
WSA-1
1.89
-
Total
2.30
393
36 -Inch Pipe Closure Project (previously permitted under SAW -2014-01477; NWP 18)
Wetland H
Pipe Closure with
Overflooding (includes fill for
cofferdam)
0.098
-
Stream 4
Pipe Closure with
Overflooding
_
65
48 -Inch Pipe Closure Project (previously permitted under SAW -2015-01670; NWP 18)
Wetlands
Pipe Closure with
Overflooding
0.407
-
Streams
Pipe Closure with
Overflooding
-
448
Prolect under the Proposed IP Modification
No changes in impacts to jurisdictional wetlands and streams for the Stormwater Diversion
Project are proposed under the IP modification. Specifically, the re -grading of the stormwater
divider berm and WSA-1 (dredge basin) will not extend beyond the footprint of these features,
as inclusive of the jurisdictional waters that encompass the features and the associated
previously permitted impacts.
10

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
5.2 36 -INCH PIPE CLOSURE PROJECT
Project as Permitted by USACE
wood.
Action ID SAW -2014-01477, issued by the USACE for the 36 -Inch Pipe Closure Project,
provided the following description of the project area and activity: "The proposed project
includes a permanent discharge of fill material into 0.001 acre of wetlands and 4 linear
feet (8 square feet) of streams, resulting in the permanent conversion of 0.097 acre of
wetlands and 61 linear feet (0.003 acre) of stream to open waters in order to close a 36 -
inch corrugated metal pipe that flows under an existing coal ash basin." The total amount
of wetland impact was 0.098 acre and encompassed Wetland H. The total amount of
stream impact was 65 linear feet and encompassed Stream 4. These impacts to
jurisdictional waters are included in Table 1.
Prosect under the Proposed IP Modification
No changes in impact size/extent to jurisdictional wetlands and streams for the 36 -Inch Pipe
Closure Project are proposed under the IP modification. Specifically, the regrading of WSA-2
will not extend beyond the footprint of this feature, as inclusive of the jurisdictional waters
(Wetland H and Stream 4) that encompass the feature and the associated, previously permitted,
permanent impacts. The only change will be in the type of impact; i.e., from impoundment of the
jurisdictional area to regrading of the jurisdictional area.
5.3 48 -INCH PIPE CLOSURE PROJECT
Project as Permitted by USACE
Action ID SAW -2015-01670, issued by the USACE for the 48 -Inch Pipe Closure Project,
provided the following description of the project area and activity: "The proposed project
includes the permanent conversion of 0.407 acre of wetlands and 448 linear feet of stream
to open waters in order to close a 48 -inch corrugated metal pipe that flows under an
existing coal ash basin." The jurisdictional limits of the two impacted wetlands and the
three impacted streams were based on the land survey of these areas by LDSI in July of
2105. The impacted wetlands and streams were assigned feature identifiers that were
specific to the permitting of the 48 -Inch Pipe Closure Project. As such, they were not
included in the set of jurisdictional waters that comprised the Stormwater Diversion
Project. The wetland and stream impacts for the 48 -Inch Pipe Closure Project are included
in Table 1.
11

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
Prosect under the Proposed IP Modification
wood.
No changes in impact size/extent to jurisdictional wetlands and streams for the 48 -Inch
Pipe Closure Project are proposed under the IP modification. Specifically, the re -grading
of the pipe closure area will not extend beyond the footprint of this area, as inclusive of the
jurisdictional waters that encompass the area and the associated, previously permitted,
permanent impacts. The only change will be in the type of impact; i.e., from impoundment
of the jurisdictional area to regrading of the jurisdictional area.
5.4 ASH BASIN CLOSURE ACTION
The Ash Basin Closure action will result in a total of 0.025 acre of permanent impacts to
open waters (i.e., Dan River) from the establishment of the four gabion structures. These
open water impacts were calculated to the OHWM elevation and not the 100 -year floodplain
elevation. The 0.025 -acre total impact is presumed to be less than substantial, as the impact
area associated with the construction (footprint) of each gabion will be limited to a very small
work area. A total of 0.125 acre of temporary impacts to open waters will occur from the
construction corridor established at the gabion locations. Table 2 presents the proposed
impacts to jurisdictional waters for the Ash Basin Closure action.
Table 2. Proposed impacts to jurisdictional open waters (Dan River), Ash Basin Closure
Action, Dan River Plant, Rockingham County, North Carolina.
Permanent Impacts
Approximate
Approximate
Assumed
Gabion Top
Gabion
Gabion Area
Proposed
Gabion
Riverbank
Width
Length
Below
Impacts
ID
S
(feet)
Z
Below
OHWM
(acre)
(ZH:H:1 V)
OHWM (feet)
(square feet)
G-1
12
2
22.8
273.1
0.0062
G-2
12
2
22.8
273.1
0.0062
G-3
12
2
22.8
273.1
0.0062
G-4
12
2
23.2
278.9
0.0064
Totals
1,098
0.025
Temporary Impacts
Assumed
Approximate
Impact Below
Gabion
Additional Width
Gabion Length
Impact Below OHWM
OHWM
ID
for Construction
Below OHWM
(square feet)
(acre)
(feet)
(feet)
G-1
60
22.8
1,368.0
0.031
12

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
wood.
G-2
60
22.8
1,368.0
0.031
G-3
60
22.8
1,368.0
0.031
G-4
60
23.2
1,392.0
0.032
Totals
5,496.0
0.125
5.5 BEST MANAGEMENT PRACTICES
All development projects in North Carolina that disturb an acre or greater of land require an
approved Erosion & Sediment Control (E&SC) Plan. E&SC Plans must be produced in
accordance with the North Carolina Erosion and Sediment Control Planning and Design
Manual, dated May 2013. This manual includes best management practices (BMPs) for
reducing erosion and sedimentation during construction. This requires proper site preparation
techniques, surface stabilization, runoff control measures, diffuse flow through the riparian
buffer, inlet and outlet protection, and stream protection. Rockingham County uses this manual
when directing developers during new development or redevelopment that exceeds one acre.
As Rockingham County is not NPDES Phase II nor is the watershed in a regulated community,
it has no post -construction soil and erosion or stormwater control obligations. Rockingham
County relies upon the NCDEQ Winston-Salem Regional Office to oversee and enforce their
federal soil and erosion control requirements for new construction. All work activities to be
completed under the proposed IP modification as described herein will be conducted in a
manner to minimize the potential for erosion and sedimentation.
5.6 NPDES PROJECTS AT DAN RIVER PLANT
During the December 17, 2018 Pre -application meeting with David Bailey of the USACE and
representatives of Duke Energy and Wood, Mr. Bailey requested a list of the current/active
NPDES projects at the Dan River Plant. Specifically, Mr. Bailey requested a list of the wetlands
and streams that fall under the existing NPDES Permit at the stream station..
There are no additional wetlands within a current or former NPDES permit that need to be
addressed with this IP modification. The only wetland that was within a NPDES permit was the
dredge pool (dredge basin) designated as WSA1 in the IP. The dredge pool collected water
from the Dry Stacks for discharge to the secondary basin. There are no wetlands associated
with the active NPDES Wastewater Permit NC0003468. The 48 -inch pipe closure area receives
stormwater from the combined cycle plant which is currently pumped to the Settling Pond under
Stormwater Permit NCS000572 and former NWP.
13

Wetland Master Plan - Addendum 1
Dan River Plant Ash Basin Closure wood.
Rockingham County, North Carolina
Project No. 7810150290
6.0 COMPENSATORY MITIGATION
This chapter of the Addendum report presents information on the compensatory mitigation for
impacts to waters of the U.S. at the Dan River Plant for the Stormwater Diversion Project, the
36 -inch Pipe Closure Project, and the 48 -inch Pipe Closure Project, as originally presented in
the April 2017 WMP and permitted by the USACE and DWR, and as developed under the
proposed IP modification. Some of the content on compensatory mitigation, as originally
presented in the WMP, is not included herein; therefore, reference should be made to the April
2017 WMP. Information on compensatory mitigation associated with the Ash Basin Closure
action is also presented in this chapter. Finally, it is noted that information on compensatory
mitigation for impacts to jurisdictional waters for the DR 131 Project and the DR 134 Project is
not presented herein, as no changes to these two projects are anticipated under the proposed
activities for the IP modification.
6.1 STORMWATER DIVERSION PROJECT
Prosect as Permitted by USACE and DWR
Compensatory mitigation for the Stormwater Diversion Project entailed advance credit purchase
through the North Carolina Division of Mitigation Services (NCDMS) In -Lieu Fee Program. Table
3 presents the NCDMS mitigation costs for impacts to jurisdictional riparian wetlands, non -
riparian wetlands, cool water streams, and the dredge basin under the issued USACE IP. Table
3 reflects changes in the mitigation cost analysis as requested by the USACE in the July 12,
2017 USACE RAI. Specifically, the USACE requested that the classification of Wetland A and
the Dredge Basin wetland be changed from Hardwood Flat to Headwater Forest. Forthwith, the
USACE requested that the wetland mitigation credit classification be changed from Non -
Riparian wetland to Riparian, Non-Riverine wetland for Wetland A and the Dredge Basin
wetland. No mitigation was offered for impacts to Wetland H, as the authorized impacts for
overflooding (permanent) to this wetland were previously permitted by the USACE via issuance
of NWP 18 (Action ID SAW -2014-01477, issued on September 29, 2014). As the Dan River
Plant does not occur within any watershed in the state where Riparian Buffer Rules are
administered by the State of North Carolina, no mitigation was included in Table 3 for impacts to
riparian buffers.
14

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
wood.
Table 3. Mitigation costs for impacts to waters of the U.S., Stormwater Diversion Project,
36 -Inch Pipe Closure Project, and 48 -Inch Pipe Closure Project, Dan River
Plant, Rockingham County, North Carolina.
Fee Category
Features
Impacts
Stormwater Diversion Project
Riparian Wetland
Wetland D - NC WAM Medium Rating
0.16 acre
Wetland F - NC WAM Low Rating
0.06 acre
Riparian Wetland
(Non-Riverine)
Wetland A - NC WAM Medium Rating
0.19 acre
Riparian Wetland
(Non-Riverine)
Dredge Basin - NC WAM Low Rating
1.89 acres
Perennial Stream
Stream 1 - NC SAM High Rating
393 linear feet
36 -Inch Pipe Closure Project
Riparian Wetland
Wetland H - Pipe Closure with Overflooding
0.098 acre
Perennial Stream
Stream 4 - Pipe Closure with Overflooding
65 linear feet
48 -Inch Pipe Closure Project
Non -riparian Wetland
Pipe Closure with Overflooding
0.407 acre
Perennial Stream
Pipe Closure with Overflooding
448 linear feet
All Projects Combined
Fee Category
Total Impacts (NCDMS Calculations)
Cost
Riparian Wetland
2.398 acres
(2.50 acre increment X 2 mitigation ratio X $40,580
per unit cost
$202,900
Non -riparian Wetland
0.407 acre
(0.50 acre increment X 2 mitigation ratio X $26,631
per unit cost
$26,631
Perennial Stream
1094 linear feet
(1,094 linear feet X 2 mitigation ratio X $300 per unit
cost)
$656,400
Sum of All Costs
$885,931
15

Wetland Master Plan - Addendum 1
Dan River Plant Ash Basin Closure wood.
Rockingham County, North Carolina
Project No. 7810150290
Prosect under the Proposed IP Modification
As no changes in impacts to jurisdictional wetlands and streams for the Stormwater Diversion
Project are proposed under the IP modification, no adjustments in compensatory mitigation are
necessary.
6.2 36 -INCH PIPE CLOSURE PROJECT
Project as Permitted by USACE
Compensatory mitigation for the 36 -Inch Pipe Closure Project entailed advance credit purchase
through the North Carolina Division of Mitigation Services (NCDMS) In -Lieu Fee Program. A
mitigation ratio of 2:1 was applied for the wetland and stream impacts. Table 2 presents the
NCDMS mitigation costs for the project impacts under the issued USACE IP.
Project under the Proposed IP Modification
As no changes in impacts to jurisdictional wetlands and streams for the 36 -Inch Pipe Closure
Project are proposed under the IP modification, no adjustments in compensatory mitigation are
necessary
6.3 48 -INCH PIPE CLOSURE PROJECT
Prosect as Permitted by USACE
Compensatory mitigation for the 48 -Inch Pipe Closure Project entailed advance credit purchase
through the North Carolina Division of Mitigation Services (NCDMS) In -Lieu Fee Program. A
mitigation ratio of 2:1 was applied for the wetland and stream impacts. Table 2 presents the
NCDMS mitigation costs for these impacts under the issued USACE IP.
Project under the Proposed IP Modification
As no changes in impacts to jurisdictional wetlands and streams for the 48 -Inch Pipe Closure
Project are proposed under the IP modification, no adjustments in compensatory mitigation are
necessary.
16

Wetland Master Plan - Addendum 1
Dan River Plant Ash Basin Closure wood.
Rockingham County, North Carolina
Project No. 7810150290
6.4 ASH BASIN CLOSURE ACTION
No compensatory mitigation is proposed for the 0.025 acre of permanent impacts and 0.125
acre of temporary impacts to open waters (Dan River) under the Ash Basin Closure action,
as specifically occurring from the construction of the four gabion structures.
17

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
7.0 PROTECTED SPECIES
7.1 BACKGROUND
wood.
Certain plant and animal species are protected by the Federal Endangered Species Act (ESA)
of 1973 (16 USC 1531-1544, December 28, 1973, as amended 1976-1982, 1984, and 1988),
which is administered and enforced by the U.S. Fish and Wildlife Service (USFWS), Region 4.
USACE IP and Nationwide Permit General Condition 11 require that projects authorized by the
USACE do not adversely affect federally protected species. Should a finding of adverse effect
be presumed by the USACE, coordination with the USFWS is typically required to avoid impacts
or minimize impacts to the practicable extent (Section 7 Consultation).
Certain information regarding protected plant and animal species for the Stormwater Diversion
Project and Associated Projects, as originally permitted, was previously presented in the April
2017 WMP, and is not repeated herein. This chapter presents information on protected species
under the proposed activities for the IP modification, and specifically for the Ash Basin Closure
action.
7.2 AFFECTED ENVIRONMENT
Figure 1 presents the general location of the Ash Basin Closure Action area and associated
projects; i.e., the affected environment as related to protected species. Wood conducted a
record search to identify documented federally protected species (threatened or endangered)
which have elemental occurrences in Rockingham County. As specifically related to the North
Carolina Natural Heritage Program (NCNHP) database search, the query of element
occurrences encompassed a one -mile radius of the Dan River Plant. The NCNHP database
query results reported no element occurrences of federally listed species within the Dan River
Plant or within a one -mile radius of the station. The results of the January 7, 2019 NCNHP
database search query are included in Appendix B.
The James spinymussel (Pleurobema collina), a federally endangered mussel species,
occurs in the James River drainage and the Dan/Mayo River systems within the Roanoke
River drainage in Virginia, North Carolina, and West Virginia. The species requires free
flowing streams with a variety of flow regimes, typically small, headwater tributaries. In
addition, it is found in a variety of substrates that are free from silt. Based on previous site
visits, Wood presumed that potentially suitable habitat for the James spinymussel was not
present within the project area landward of the Dan River; i.e., within the streams
associated with the overall work activities described in this Addendum report. Regarding
the establishment of the four gabion structures within the Dan River, as including the open
water habitat and abutting sandy shoreline, the proposed permanent and temporary
impacts (total of 0.150 acre) are very small and essentially insubstantial. In addition, the
Dan River at the steam station is not suitable habitat for the species; i.e., small, headwater
18

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
wood.
tributaries. Therefore, it is presumed that the Ash Basin Closure action, as specifically
related to work conducted in the Dan River, would have no effect on the James
spinymussel and its habitat.
The Roanoke logperch (Percina rex) (federally endangered) is known from portions of the
Chowan and Roanoke River basins within the Ridge and Valley, Piedmont, and Upper
Coastal Plain Physiographic Regions, including recent collections in the Dan River, Mayo
River and Smith River watersheds in North Carolina. The species is found in medium to
large sized warm, clear streams and small rivers of moderate to low gradient. Adults
usually occupy riffles, runs, and pools containing sand, gravel, or boulders that are free of
silt. Based on previous site visits, Wood presumed that potentially suitable habitat for the
Roanoke logperch was not present within the project area landward of the Dan River; i.e.,
within the streams associated with the overall work activities described in this Addendum
report. Regarding the establishment of the four gabion structures within the Dan River
(open water habitat), the proposed permanent and temporary impacts (0.150 acre) are
very small and insubstantial. Therefore, it is presumed that the Ash Basin Closure action,
as specifically related to work conducted in the Dan River, would have no effect on the
Roanoke logperch and its habitat.
19

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
8.0 CULTURAL RESOURCES
8.1 BACKGROUND
wood.
Section 404 of the Clean Water Act requires that projects authorized by the USACE do not
adversely affect historical properties which are listed or eligible for listing on the National
Register of Historic Places (NRHP). Cultural resources are protected by Section 106 of the
National Historic Preservation Act (NHPA). The Section 106 process consists of consultation
with state and federal agencies, consultation with Native American tribes by the lead federal
agency, and the identification and evaluation of cultural resources for inclusion in the NRHP.
For the IP submittal, Wood conducted a cultural resource screening to assess the
presence/absence of known cultural resources and NRHP-listed resources within a half -mile
search radius of the Dan River Plant. The research included a review of archaeological files at
the North Carolina State Historic Preservation Office (NCSHPO) and the online NCSHPO Web
GIS Service. The investigation did not include field efforts to identify or verify cultural resources,
and no formal coordination with the NCSHPO office was included in the review. Certain
information (including report figure) regarding cultural resources for the Stormwater Diversion
Project and Associated Projects, as originally permitted, was previously presented in the April
2017 WMP, and is not repeated herein. This chapter presents information on cultural resources
under the proposed activities for the IP modification, and specifically for the Ash Basin Closure
action.
8.2 AFFECTED ENVIRONMENT
Figure 1 presents the general location of the Ash Basin Closure Action area and associated
projects; i.e., the affected environment as related to cultural resources. No structures or Districts
were listed on the NRHP within the affected environment or within a half -mile radius. According
to the North Carolina Office of State Archaeology records, the 36 -Inch Pipe Closure Project and
48 -Inch Pipe Closure Project occur near a portion of the steam station that has been surveyed
for archaeological resources (Surveys ER 92-8133 and ER 05-2334). No archaeological
remains were discovered during the surveys identified above. In 2014, Wood (formerly Amec
Foster Wheeler) conducted a Phase I archaeological survey on a 129 -acre tract next to the Dan
River Plant. Two archaeological sites were identified, sites 31 RK210 and 31 RK1 2. Site
31 RK210 is a mid -19th to early 20th century site, while 31 RK12 is a Late Prehistoric site.
Regarding NRHP status, site 31 RK210 is not eligible and 31 RK12 is eligible. Three additional
sites were identified near or abutting the southern shoreline of the Dan River and directly
opposite of the PAB and SAB: 31 RK61, 31 RK5 and 31 RK1. Regarding NRHP status, site
31 RK61 is unassessed and further work is recommended for 31 RK5. Site 31 RK1 is listed on the
NRHP. None of these three sites, however, occur within the affected environment and,
specifically, within the footprint of the Ash Basin Closure action area. Table 4 presents the
identified sites and their NRHP status.
20

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
L"Arefone,
It
Table 4. Identified archaeological sites within a half -mile radius or vicinity of the Dan
River Plant, Rockingham County, North Carolina.
Site Number Description
NRHP Status
Sites within Half -mile Radius of Steam Station
31 RK61
Prehistoric Burials
Unassessed
31 RK5
Prehistoric Woodland
Further work recommended
31RK1
Lower Sauratown Site
Listed on NRHP
Sites in Vicinity of Steam Station
31 RK210
Mid 19th - early 20th century
Not eligible
31 RK12
Late Prehistoric
Eligible
The implementation of proposed activities for the IP modification, and specifically for the Ash
Basin Closure action, is not expected to influence these five identified cultural resources due to
the footprint of the affected environment and its distance to these resources. As a part of the
permit process, required and routine consultation with the NCSHPO under Section 106 of the
CWA will be undertaken by the USACE Wilmington District.
21

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
FIGURES
wood.

d
Eaery 6 Meada++ �4
x
9
m
/ 0 2 4
Miles
Figure 1. General Location of
Ash Basin Closure and
Associated Projects
Dan River Steam Station
Rockingham County, NC
Legend
Ash Basin Closure
F—Iand Associated
Projects Work Area
Ash Basin
Site Boundary
DUKE
ENERGY
wood
Job No. 7810150290.13
Drawn By: JAH
Reviewed By ---
Date: 1/11/2019
The map shown here has been
created with all due and
reasonable care and is strictly for
use with Wood project number
7810150290.13 Wood assumes no
liability, direct or indirect,
whatsoever for any such third
party or unintended use.

a
Every 6 Meada++ �4
w
m
13
/ 0 2 a
Miles
Figure 2. Location of Proposed
Work Areas
and Project Components
Dan River Steam Station
Rockingham County, NC
Legend
Interceptor
Ditches
Longitudinal
Ditches
Gabion
Locations
Wetlands
iL Ash Basin
MSite Boundary
DUKE
ENERGY
wood
Job No. 7810150290.13
Drawn By: JAH
Reviewed By ---
Date: 1/16/2019
The map shown here has been
created with all due and
reasonable care and is strictly for
use with Wood project number
7810150290.13 Wood assumes no
liability, direct or indirect,
whatsoever for any such third
party or unintended use.

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
APPENDIX A
LVArfe m*e,
It
PLAN VIEW AND CROSS-SECTION PERMIT DRAWINGS

I I I I I
4 5 6 7 8 01 REV. 0
Waters of the US Impacts x — J / �� III I I I \\ \ \ \ \ \ \ — — — / ' %� �' — \ / `/// /�// ✓ / — \ \ \ \ \
Permanent Impacts
LEGEND
Feature or
700 EXISTING MAJOR CONTOUR (10') [REF. 1 ]
Notes
EXISTING MINOR CONTOUR (2') [REF. 1]
Structure
700 PROPOSED MAJOR CONTOUR (10')
PROPOSED MINOR CONTOUR (2')
Gabion 1
> > PROPOSED GRASS -LINED DITCH
See Typical Gabion Outlet Section and
PROPOSED RIPRAP LINED DITCH
— — — — — — EXISTING PROPERTY BOUNDARY
—A
Gabion 2
— — — — — — — EXISTING 100 -YEAR FLOODPLAIN
See Typical Gabion Outlet Section and
EXISTING STREAM
.:.;. EXISTING WETLAND
Profile Details (Figure 03
FM EXISTING SANITARY SEWER FORCE MAIN
Gabion 3
SS EXISTING GRAVITY SANITARY SEWER PIPE
See Typical Gabion Outlet Section and
EXISTING SANITARY SEWER MANHOLE
G G EXISTING NATURAL GAS PIPELINE
Profile Details (Figure 03
— — — —G — — — —G — — — —G — EXISTING NATURAL GAS PIPELINE (NOT SURVEYED)
Gabion 4
xoHwxalw EXISTING OVERHEAD ELECTRIC UTILITY
Seo Typical Gabion Outlet Section and
— — — — — — EXISTING UTILITY EASEMENT
x EXISTING FENCE
—13
EXISTING VEGETATION BOUNDARY
Gabion
EXISTING PIPES
Dan River impact (Open Water)
EXISTING RIPRAP
I I I I I
4 5 6 7 8 01 REV. 0
Waters of the US Impacts x — J / �� III I I I \\ \ \ \ \ \ \ — — — / ' %� �' — \ / `/// /�// ✓ / — \ \ \ \ \
Permanent Impacts
Project Name
Feature or
Impact Area
Notes
Structure
Open Water (acre)
Gabion 1
0.0062
See Typical Gabion Outlet Section and
Profile Details (Figure 03
Gabion 2
0.0062
See Typical Gabion Outlet Section and
Ash Basin
Profile Details (Figure 03
Closure Action
Gabion 3
0.0062
See Typical Gabion Outlet Section and
Profile Details (Figure 03
Gabion 4
0.0064
Seo Typical Gabion Outlet Section and
Profile Details (Figure 03
Total
Gabion
0.025
Dan River impact (Open Water)
Wetland
Stream
acre
feet
36Pipe
Impoundment impacts previously permitted
Closure
Closure
WSA-2
0.098
65
under USACE SAW -2014-01477 (NWP 18)
Project
48 -Inch Pipe
Closure
-
0,407
448
Impoundment impacts previously permitted
Project
under USACE SAW -2015-01670 (NWP 18)
Stormwater
Diversion
WSA 3
0.19
_
Impoundment impact previously permitted
Project
(Wetland A)
under USACE SAW -2015-01381 (IP)
Temporary Impacts
Project Name
Structure
Impact Area
Open Water acre
Nates
Gabion 1
0.031
Construction corridor for gabion placement
Ash Basin
Gabion 2
0.031
Construction corridor for gabion placement
Closure Action
Gabion 3
0.031
Construction corridor for gabion placement
Gabion 4
0.032
Construction corridor for gabion placement
Total
Gabions
0.125
Construction corridors for all four gabion
A\
WETLAND
-STORMWATER DIVERSION
PROJECT
x — DREDGE BASIN / \ —Cry — �� �// / I / �� 1 / \ \ / Ox __A60 � \ I \ 1 I I
Y, / �// �� — \ \ \ \ \ ( O \ \ \ \ -� \ RESTORE GRAVITY DRAINAGE BY REMOVING
STORMWATER DIVERSION PROJECT / _ \
� � • -- i i / � i� \\ \ 1 / _ � � -THE TEMPORARY PIPE CAP. PIPE MAY BE
// SLIPLINED DUE TO THE PIPE MATERIAL BEING / I
\ J / RESTORE GRAVITY DRAINAGE BY REMOVNG THE PLUG // / / i �� �'� — I G �I I / 7 %/ CORRUGATED METAL. WORK MAY ALSO / \
IN THE EXISTING PIPE. METHODS INCLUDE PHYSICALLY// / / / i — I 1 1 ` • \\\� \jj REQUIRE LOCALIZED GRADING TOA DEPTH
\ — REMOVING THE PLUG, OR REMOVING THE PLUGGED // \ / — �� I I 1 \ `// / OF 18 INCHES OR LESS BELOW EXISTING
\ / SECTION OF PIPE. PIPE INSTALLATION MAY INCLUDE i / I — ��� j /= \ I I \ \ \ \ _� /j GRADE TO REMOVE CCR MATERIAL AND TO
CONSTRUCTION OF A HEADWALL. PIPE CONSTRUCTION — %� — — / I 1 1 - PROMOTE DRAINAGE, AND/OR HEADWALL.
\ \ I MAY ALSO REQUIRE SOME LOCALIZED GRADING TO'
PROMOTE DRAINAGE
PROPOSED JUNCTION
36 -INCH PIPE CLOSURE PROJECT
BOX
/
RESTORE GRAVITY DRAINAGE BY REMOVING
THE PLUG H THE EXISTING PIPE. METHODS \ �•G / I I \ / / `C C\ PROPOSED 42 -IN. DIA.
NCLUDE PHYSICALLY REMOVING THE PLUG,
SDR 17 HDPE PIPE
OR REMOVING THE PLUGGED SECTION OF \ �\ G /
/ \ ii
CONSTRUCTION OF A HEADWALL. PIPE PIPE. PIPE INSTALLATION MAY INCLUDE _:Ar
EXISTING 42" ELLIPTICAL PIPE I /� N ) I / CONSTRUCTION MAY ALSO REQUIRE
-� I / LOCALIZED GRADING TO A DEPTH OF 18
— — ( (REMOVE PIPE PLUG) 1 I r �\ / I / / INCHES OR LESS BELOW EXISTING GRADE
TO REMOVE CCR MATERIAL AND TO— / \ _ G-
iPROMOTE DRAINAGE. _ — / / �. — C
/ k0 PROPOSED JUNCTION — / /— — ` \ — / \ \ �\ \\\\\\\\�
\ It / // /VIII ' / BOX DD -1 — v —
REMOVE ABANDONED
JUNCTION BOX AND ll /�/ �� / \ \ \ l/I I 41 I%
REPLACE WITH NEW
JUNCTION BOX,//
\ �•\ \ / \ \\\ \\ \ \ / / / // — 5201\ X550— — / //// —/ /\� /i /����
\' N, —�/ll
\• i x
\� \\\`\�✓/ \\ \ \\\ \\\ \—� —� �// /510 + �� \�/
PROPOSED 48 -IN. DIA. SDR -17 HDPE PIPE — +
NOTES:
1. PROPOSED GRADES AND STORMWATER FEATURES HAVE BEEN / j\� 1 \ \\ — _PROPOSED 48 -IN. DIA. PROPOSED 48 -IN. DIA. I 1 I \
DEVELOPED BASED ON THE ENGINEER'S ESTIMATE OF BOTTOM OF ///� �� \ PIPE ' j / SDR -17 HDPE PIPE L 1 It'll
ASH GRADES. PROPOSED GRADES AND STORMWATER FEATURES
MAY BE MODIFIED BASED ON FIELD CONDITIONS WITH THE�/ / /
APPROVAL OF THE ENGINEER.
V A\v
REFERENCES: I \ \ /// / / L ,�— o k ( f I
1. EXISTING TOPOGRAPHIC INFORMATION WAS PRODUCED FROM PHOTOGRAMMETRIC /
METHODS FROM AERIAL PHOTOGRAPHY OBTAINED ON FEBRUARY 7, 2014 BY LDSI, INC. / I I I ! Til II\ \\ \ I\ #* // //j / / x >
100 0 100 200 FT
� \ // /// \\ \ I / I ( I III :r:•I:•;I• //
\ I 1 \ 48 -INCH PIPE CLOSURE PROJECT
�T� RESTORE GRAVITY DRAINAGE BY —
INSTALLING A NEW 48 -INCH
JACK -AND -BORE, OPEN REINCH CUT, PE IOR /�
\\ o OTHER INSTALLATION METHODS AS
APPROVED BY THE ENGINEER. PIPE-
\ - INSTALLATION MAY INCLUDE
\ \ CONSTRUCTION OF A HEADWALL. PIPE /
CONSTRUCTION MAY ALSO REQUIRE
/ LOCALIZED GRADING TO A DEPTH OF 18
INCHES OR LESS BELOW EXISTING GRADE /
\ TO REMOVE CCR MATERIAL AND TO
PROMOTE DRAINAGE. ,
1 \ \ / \ \ ✓ // THE EXISTING GROUTED 48 -INCH PIPE MAY #
/LEFTIN PLACE OR REMOVED.
\/�
o
x 11
—F /
INSTALL GABION 2
X INSTALL GABION 1
1 RIPRAP GABION
1 (TYP.)
M
17
soa
a
L
L
7
soo
L o
I NCHES 1 2 3
TENTHS 10 20 30
0 2/11/2019 7810-15-0290 DAM DECOMMISSIONING CAL CAL I CHR I CHR
REV DATE JOB NO. PROJECT TYPE DES DFTR I CHKD I ENGR
Plotted By: Lash, Christa Sheet Set: USACE PERMIT FIGURES Layout: POST—CLOSURE CONDITIONS February 11, 2019 04: 03: 04pm P:\D7526\Project\DUKE ENERGY\Dan River\7810150290 Emergent Issues\08 PAB CCR Qty\USACE Permit Figures\FINAL CONDITIONS PLAN.dwg
I
L -77 (� IIS III
0 0
INSTALL GABION 4
/
INSTALL GABION 3
df /
�J
FF]
Grp <
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TITLE
wood.
Wood Environment &
Infrastructure Solutions, Inc.
4795 MEADOW WOOD LANE, SUITE 310 EAST
CHANTILLY, VA 20151 FOR
TEL [phone] FAX [phone]
DAM DECOMMISSIONING PLAN - SEQUENCE C
DAN RIVER STATION
POST -CLOSURE CONDITIONS - PLAN VIEW
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247 FOR PERMITTING
SEAL SCALE: AS SHOWN
D
UKE DWG TYPE: DWG
FNEnf"*+'v JOB NO: 7810-15-0290
® DATE: 2/11/2019
FILENAME: FINAL CONDITIONS PLAN.dwg
DWG SIZE DRAWING NO.
ANSI FIGURE -01
INDIVIDUAL PERMIT MODIFICATION 22"x34"
DESCRIPTION
7 8 9 10
I I I I
DES: CAL
Dl CAL
CHIl CHR
ENGR: CHR
All CHR
REVISION
0

F
JOU
540
530
520
510
500
490
480
475
-0+25 0+00
550
540
530
520
510
500
490
480
475
0+50
1+00
1+50
2+00
2+50
3+00
3+50
4+00
4+50
5+00
5+50
550
540
530
520
510
500
490
480
475
6+00
I 02
— POTENTIAL HEADWALLFLARED END SECTION OR'-
LOCATION _ ENGINEER-7TT
_
PROPOSED 48 -INCH APPROVED EQUAL
DIAMETER PIPE
— -- 3
1
i
EXISTING PIPE INVERT I
EXISTING GROUTED 48" CMP MAY
BE LEFT IN PLACE OR REMOVED
APPROXIMATE AREA OF
EXISTING GRADE
ESTIMATED
BOTTOM OF ASHEXISTING DRAINAGE BOX TO BE REMOVED
ORDINARY HIGH WATERMARK
EXISTING GRADE
ORDINARY HIGH WATER MARK
APPROX. ELEVATION 486.381'
SEE
INSET
—
— — — — — — — — — — — — — — EXISTING GRADE
APPROX. ELEVATION 486.228'
—
— —
— — — — — —
APPROXIMATE AREA OF
EXCAVATION.
ESTIMATED BOTTOM
OF ASH
RIPRAP
�
— — — — — — — —
APPROXIMATELY 271 CY
_
— —
— — — — — — —
SEQUENCE C POST -CLOSURE GRADE
(TOP OF RIPRAP)
— — — — —
—
—
EXISTING GRADE
GABI N 1
01
— —
— — — — — PROPOSED 42" RCP
— FLARED END —
1.5%
8 OZ/SY GEOTEXTILE TO BE PLACED ON
GROUT STOPS APPROX.
SUBGRADE BEFORE PLACING RIPRAP
AT STA 6+23 (REF. 1)
�
ESTIMATED
BOTTOM
OF ASH
SEQUENCE C POST -CLOSURE GRADE
ESTIMATED
BOTTOM OF ASH
- 02
EXISTING
48" CMP TRANSITION FROM 48" CMP
8 OZ/SY GEOTEXTILE TO BE PLACED ON
GROUT STOPS APPROX.
SUBGRADE BEFORE PLACING RIPRAP AT STA 9+45 REF. 1) TO 48" RCP (SLOPE CHANGE
( FROM 0.75% TO 2.00%)(REF. 1) TOP OF SUBGRADE
.,.•,
`DAN
—
—R
RIVER
—
EXCAVATION VOLUME IS
APPROXIMATELY 690 CY
POTENTIAL HEADWALL
LOCATION
JUNCTION BOX I ENGINEER -APPROVED (TOP OF RIPRAP)
EQUAL o
1.5 /o
\
—
—
1.5%
AI
v8
WETLAND TO A DEPTH OF 18 INCHES
OR LESS BELOW EXISTING GRADE
-
-"!�&777
—
—
—
EXISTING 42"
77
3
\
EXISTING GRADE
TO REMOVE ACCUMULATED CCR
MATERIAL (IF ANY) AND TO
I
CONCRETE PLUG AT INLET
f-
ELLIPTICAL PIPE TO
REMAIN
8 OZ/SY GEOTEXTILE TO BE PLACED ON EXISTING 36" RCP
36" RCP INLET ELEV. = 502' SUBGRADE BEFORE PLACING RIPRAP
r
(TO BE REMOVED)(REF. 3)
1
=111OF
WETLAND AREA
PROMOTE DRAINAGE.
(TO BE REMOVED)
_
DAN RIVER
(REF. 3)1 1 1 T
—
WORK MAY INCLUDE REGRADING OF
\ \
— — — — —
— — — — — — — —
—
—
— —
WETLAND TO A DEPTH OF 18 INCHES_t
— — —
— — — — — —
— — —
OR LESS BELOW EXISTING GRADE
EXISTING GRADE TO REMOVE ACCUMULATED CCR
EXISTING
PIPE INVERT
EXISTING
48" CMP
OF WETLAND AREA MATERIAL (IF ANY) AND TO
PROMOTEDRAINAGE.
-0+25 0+00
550
540
530
520
510
500
490
480
475
0+50
1+00
1+50
2+00
2+50
3+00
3+50
4+00
4+50
5+00
5+50
550
540
530
520
510
500
490
480
475
6+00
I 02
— POTENTIAL HEADWALLFLARED END SECTION OR'-
LOCATION _ ENGINEER-7TT
_
PROPOSED 48 -INCH APPROVED EQUAL
DIAMETER PIPE
— -- 3
1
i
EXISTING PIPE INVERT I
EXISTING GROUTED 48" CMP MAY
BE LEFT IN PLACE OR REMOVED
6+00
550
540
530
520
510
500
490
480
6+50 7+00 7+50 8+00 8+50 9+00 9+50 10+00 10+50 11+00 11+50\_ 12+00
EXISTING 48" RCP
rl_'
48 INCH DRAINAGE PIPE GROUTED
01 (SEE NOTE 1)
APPROXIMATE AREA OF
EXISTING GRADE
ESTIMATED
BOTTOM OF ASHEXISTING DRAINAGE BOX TO BE REMOVED
ORDINARY HIGH WATERMARK
EXISTING GRADE
ORDINARY HIGH WATER MARK
APPROX. ELEVATION 486.381'
—
— — — — — — — — — — — — — — EXISTING GRADE
APPROX. ELEVATION 486.228'
—
— —
— — — — — —
ESTIMATED BOTTOM
OF ASH
RIPRAP
�
— — — — — — — —
APPROXIMATELY 271 CY
_
— —
— — — — — — —
SEQUENCE C POST -CLOSURE GRADE
(TOP OF RIPRAP)
— — — — —
—
—
SEQUENCE CPOST-CLOSURE GRADE
GABI N 1
01
— —
— — — — — PROPOSED 42" RCP
— FLARED END —
1.5%
8 OZ/SY GEOTEXTILE TO BE PLACED ON
GROUT STOPS APPROX.
SUBGRADE BEFORE PLACING RIPRAP
AT STA 6+23 (REF. 1)
�
SEQUENCE C POST -CLOSURE GRADE
ESTIMATED
BOTTOM OF ASH
- 02
EXISTING
48" CMP TRANSITION FROM 48" CMP
8 OZ/SY GEOTEXTILE TO BE PLACED ON
GROUT STOPS APPROX.
SUBGRADE BEFORE PLACING RIPRAP AT STA 9+45 REF. 1) TO 48" RCP (SLOPE CHANGE
( FROM 0.75% TO 2.00%)(REF. 1) TOP OF SUBGRADE
.,.•,
`DAN
—
—R
RIVER
—
POTENTIAL HEADWALL
LOCATION
6+00
550
540
530
520
510
500
490
480
6+50 7+00 7+50 8+00 8+50 9+00 9+50 10+00 10+50 11+00 11+50\_ 12+00
EXISTING 48" RCP
rl_'
48 INCH DRAINAGE PIPE GROUTED
01 (SEE NOTE 1)
-0+25 0+00
550
540
530
520
510
500
490
480
550
540
530
520
510
500
490
480
0+50 1+00 1+50 2+00 2+50 3+00 3+50 4+00 4+50 5+00 5+50 6+00
550
540
530
520
510
500
490
480
475
12+50 13+00 13+5 14+00
SEEPAGE WALL EXISTING PIPE OUTFALL
(APPROX. LOCATION) ELEV. = 484.66'
CONCRETE PLUG (REF. 1)
APPROXIMATE AREA OF
ESTIMATED
BOTTOM OF ASHEXISTING DRAINAGE BOX TO BE REMOVED
ORDINARY HIGH WATERMARK
EXISTING GRADE
EXCAVATION.
EXCAVATION VOLUME IS
— — — — — — — — — — — — — — EXISTING GRADE
APPROX. ELEVATION 486.228'
— — — — — — — —
APPROXIMATELY 271 CY
—
—
— —
— — — — — PROPOSED 42" RCP
— FLARED END —
IPRA GABION
�
SEQUENCE C POST -CLOSURE GRADE
ESTIMATED
BOTTOM OF ASH
- 02
PROPOSED SECTION OR _ _ _ SEQUENCE C POST -CLOSURE GRADE
POTENTIAL HEADWALL
LOCATION
JUNCTION BOX I ENGINEER -APPROVED (TOP OF RIPRAP)
EQUAL o
1.5 /o
WORK MAY INCLUDE REGRADING OF
1.5%
AI
v8
WETLAND TO A DEPTH OF 18 INCHES
OR LESS BELOW EXISTING GRADE
-
-"!�&777
EXISTING PIPE INVERT
EXISTING 36" RCP (GROUTED)
7
EXISTING 42"
77
7 OZ/SY GEOTEXTILE TO BE PLACED ONMEZZ7
EXISTING GRADE
TO REMOVE ACCUMULATED CCR
MATERIAL (IF ANY) AND TO
I
CONCRETE PLUG AT INLET
f-
ELLIPTICAL PIPE TO
REMAIN
8 OZ/SY GEOTEXTILE TO BE PLACED ON EXISTING 36" RCP
36" RCP INLET ELEV. = 502' SUBGRADE BEFORE PLACING RIPRAP
r
(TO BE REMOVED)(REF. 3)
1
=111OF
WETLAND AREA
PROMOTE DRAINAGE.
(TO BE REMOVED)
_
DAN RIVER
(REF. 3)1 1 1 T
-0+25 0+00
550
540
530
520
510
500
490
480
550
540
530
520
510
500
490
480
0+50 1+00 1+50 2+00 2+50 3+00 3+50 4+00 4+50 5+00 5+50 6+00
550
540
530
520
510
500
490
480
475
12+50 13+00 13+5 14+00
SEEPAGE WALL EXISTING PIPE OUTFALL
(APPROX. LOCATION) ELEV. = 484.66'
CONCRETE PLUG (REF. 1)
6+00
AAAAI
•
6+50
7+00
TENTHS 10
7+50
7
20
8+00 8+50 9+00 9+50
rl_'
36 INCH DRAINAGE PIPE GROUTED
02 (SEE NOTE 1)
10+00 10+50 11+00 11+50 12+00
SEEPAGE WALL PLUG (REF. 3)
(APPROX. LOCATION)
550
540
530
520
510
500
490
480
12+50 12+70
EXISTING 36" RCP PIPE
OUTFALL
ELEV. = 487.91'
(REF. 3)
LEGEND
-------- EXISTING GRADE
EXISTING BOTTOM OF ASH
SEQUENCE C POST -CLOSURE GRADE
(TOP OF RIPRAP)
8 OZ/SY GEOTEXTILE
TOP OF CHANNEL
EXISTING STORM PIPE
PROPOSED PIPE AND JUNCTION BOX
RIPRAP
CONCRETE PLUG
GROUT
NOTES:
1: LOCATION OF GROUTED SECTIONS OF PIPES ARE APPROXIMATE
REFERENCES:
REF. 1: DWG. "DAN RIVER POWER PLANT 48" DIA. PIPE S.W. PIPE SECTION AND PLAN VIEW"
DATE: 04/17/2014
REF. 2: DWG. NO. D -1039-M-1 Rev. No. 3 APPROVED 11/7/1980
REF. 3: DWG. "DAN RIVER POWER PLANT 42"/36" DIA. PIPE S.W. PIPE SECTION AND PLAN
VIEW" DATE: 04/17/2014
REF. 4: EXISTING TOPOGRAPHIC INFORMATION WAS PRODUCED FROM
PHOTOGRAMMETRIC METHODS FROM AERIAL PHOTOGRAPHY OBTAINED ON
FEBRUARY 7, 2014 BY LDSI, INC.
30 0 30 60 FT
TITLE
REV. 0
F -
LL_
O
LO
O
M
0
O
M
DAM DECOMMISSIONING PLAN -SEQUENCE C
wood.DAN RIVER STATION
Wood Environment & PIPE PROFILES
Infrastructure Solutions, Inc.
4795 MEADOW WOOD LANE, SUITE 310 EAST
CHANTILLY, VA 20151 FOR
TEL: [phone], FAX [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247 FOR PERMITTING
SEAL SCALE: AS SHOWN DES: CAL
DUKE DWG TYPE: DWG DFTR CAL
JOB NO: 7810-15-0290 CHKD: CHR
E N E R v, DATE: 2/11/2019 ENGR: CHR
FILENAME: EXISTING ASH BASIN PIPE PROFILES.dwg APPD: CHR
DWG SIZE DRAWING NO. REVISION
ANSI FIGURE -02 0
0 2/11/2019 7810-15-0290 DAM DECOMMISSIONING CAL CAL CHR CHR INDIVIDUAL PERMIT MODIFICATION 22"x34"
REV DATE JOB NO. PROJECT TYPE DES DFTR CHKD ENGR DESCRIPTION
30 4 5 6 7 8 9 10
1 1
Plotted By: Lash, Christc Sheet Set: USACE PERMIT FIGURES Layout: PIPE PROFILES February 11, 2019 04: 03: 53pm P:\D7526\Project\DUKE ENERGY\Dan River\7810150290 Emergent Issues\08 PAB CCR Qty\USACE Permit Figures\EXISTING ASH BASIN PIPE PROFILES.dwg
A--�
C)f
N
rte,
c)
F--�
ORDINARY HIGH WATERMARK
EXISTING GRADE
APPROX. ELEVATION 486.228'
— — — — — — — —
—
1
IPRA GABION
SEQUENCE C POST -CLOSURE GRADE
ESTIMATED
BOTTOM OF ASH
- 02
(TOP OF RIPRAP)
1.5%
v8
-
-"!�&777
EXISTING 36" RCP (GROUTED)
7
7 OZ/SY GEOTEXTILE TO BE PLACED ONMEZZ7
f-
r
(TO BE REMOVED)(REF. 3)
1
SUBGRADE BEFORE PLACING RIPRAP-
I I
_
DAN RIVER
6+00
AAAAI
•
6+50
7+00
TENTHS 10
7+50
7
20
8+00 8+50 9+00 9+50
rl_'
36 INCH DRAINAGE PIPE GROUTED
02 (SEE NOTE 1)
10+00 10+50 11+00 11+50 12+00
SEEPAGE WALL PLUG (REF. 3)
(APPROX. LOCATION)
550
540
530
520
510
500
490
480
12+50 12+70
EXISTING 36" RCP PIPE
OUTFALL
ELEV. = 487.91'
(REF. 3)
LEGEND
-------- EXISTING GRADE
EXISTING BOTTOM OF ASH
SEQUENCE C POST -CLOSURE GRADE
(TOP OF RIPRAP)
8 OZ/SY GEOTEXTILE
TOP OF CHANNEL
EXISTING STORM PIPE
PROPOSED PIPE AND JUNCTION BOX
RIPRAP
CONCRETE PLUG
GROUT
NOTES:
1: LOCATION OF GROUTED SECTIONS OF PIPES ARE APPROXIMATE
REFERENCES:
REF. 1: DWG. "DAN RIVER POWER PLANT 48" DIA. PIPE S.W. PIPE SECTION AND PLAN VIEW"
DATE: 04/17/2014
REF. 2: DWG. NO. D -1039-M-1 Rev. No. 3 APPROVED 11/7/1980
REF. 3: DWG. "DAN RIVER POWER PLANT 42"/36" DIA. PIPE S.W. PIPE SECTION AND PLAN
VIEW" DATE: 04/17/2014
REF. 4: EXISTING TOPOGRAPHIC INFORMATION WAS PRODUCED FROM
PHOTOGRAMMETRIC METHODS FROM AERIAL PHOTOGRAPHY OBTAINED ON
FEBRUARY 7, 2014 BY LDSI, INC.
30 0 30 60 FT
TITLE
REV. 0
F -
LL_
O
LO
O
M
0
O
M
DAM DECOMMISSIONING PLAN -SEQUENCE C
wood.DAN RIVER STATION
Wood Environment & PIPE PROFILES
Infrastructure Solutions, Inc.
4795 MEADOW WOOD LANE, SUITE 310 EAST
CHANTILLY, VA 20151 FOR
TEL: [phone], FAX [phone]
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247 FOR PERMITTING
SEAL SCALE: AS SHOWN DES: CAL
DUKE DWG TYPE: DWG DFTR CAL
JOB NO: 7810-15-0290 CHKD: CHR
E N E R v, DATE: 2/11/2019 ENGR: CHR
FILENAME: EXISTING ASH BASIN PIPE PROFILES.dwg APPD: CHR
DWG SIZE DRAWING NO. REVISION
ANSI FIGURE -02 0
0 2/11/2019 7810-15-0290 DAM DECOMMISSIONING CAL CAL CHR CHR INDIVIDUAL PERMIT MODIFICATION 22"x34"
REV DATE JOB NO. PROJECT TYPE DES DFTR CHKD ENGR DESCRIPTION
30 4 5 6 7 8 9 10
1 1
Plotted By: Lash, Christc Sheet Set: USACE PERMIT FIGURES Layout: PIPE PROFILES February 11, 2019 04: 03: 53pm P:\D7526\Project\DUKE ENERGY\Dan River\7810150290 Emergent Issues\08 PAB CCR Qty\USACE Permit Figures\EXISTING ASH BASIN PIPE PROFILES.dwg
A--�
C)f
N
rte,
c)
F--�

w
EXISTING Gf
3 -FT. X 3-1 X 9-1 L
GABION BA;
550
540
530
520
510
500
490
480
475
23 4 5 6 7 8 03 REV. 0
550
540
530
520
510
500
490
480
47
5
0+50
-0+25 0+00
1+00
1+50
ESTIMATED BOTTOM OF ASH
2+00
EXISTING GRADE
2+50
3+00
3+50
4+00
4+50
5+00
ORDINARY HIGH WATER MARK
APPROX. ELEVATION 486.621'
550
540
530
520
510
500
490
480
475
5+50
5+50
6+00
6+50
7+00
3.0' 6' 3.0'
(OR ENGINEER -APPROVED ALTERNATE)
TYPICAL GABION OUTLET SECTION
7+50
8+00
PROJECTED TOP OF -
GABION BASKETS
FLOW LINE OF -
OUTLET DITCH
�I
8 OZ/SY NON -WOVEN GEOTEXTILE ---'
18 -IN. THICK GABION MATTRESS
6 -IN. NCDOT NO. 57 STONE CUSHION LAYER
MIRAFI 50OX WOVEN GEOTEXTILE
(OR ENGINEER -APPROVED ALTERNATE)
NOTES:
1. UNLESS DIRECTLY IN CONFLICT WITH REQUIREMENTS SET FORTH IN THE PROJECT NOTES AND DRAWINGS, GABIONS SHALL BE ASSEMBLED PER THE MANUFACTURER'S RECOMMENDATIONS.
2. GABIONS SHALL BE COMPRISED OF DOUBLE TWISTED HEXAGONAL ZINC COATED WIRE MESH WITH POLYVINYL CHLORIDE (PVC) COATING CONFORMING TO THE FOLLOWING REQUIREMENTS:
a. THE MESH WIRE SHALL HAVE A CROSS SECTIONAL CORE DIAMETER OF A MINIMUM OF 0.1063 INCHES WITH AN OUTER CROSS SECTIONAL DIAMETER OF A MINIMUM OF 0.1496 INCHES.
E b. THE SELVEDGE WIRE SHALL HAVE A CROSS SECTIONAL INTERNAL DIAMETER OF 0.134 INCHES AND AN EXTERNAL CROSS SECTIONAL DIAMETER OF 0.174 INCHES.
c. PVC COATING SHALL HAVE A MINIMUM THICKNESS OF 0.015 INCHES. ABRASION RESISTANCE OF PVC COATING SHALL BE LESS THAN 12% WEIGHT LOSS IN ACCORDANCE WITH ASTM D1242
AND A PROJECTED DURABILITY LIFE OF 70 YEARS WHEN TESTED IN ACCORDANCE WITH UL 7468.
d. GABION MESH SHALL BE A MESH TYPE 8 X 10 WITH NOMINAL SIZE OF 3'/4 " BY 4'/2".
3. THE CONTRACTOR SHALL TAKE CARE NOT TO DAMAGE THE PVC COATING DURING ASSEMBLY, TRANSPORTATION, PLACEMENT, AND FILLING. THE OWNER RESERVES THE RIGHT TO REJECT
GABIONS WHICH HAVE BEEN DAMAGED PRIOR TO FINAL ACCEPTANCE OF THE WORK.
4. GABIONS MAY BE ASSEMBLED USING PVC COATED LACING WIRE PER THE MANUFACTURER'S RECOMMENDATIONS, USING ALTERNATING SINGLE AND DOUBLE LOOPS THROUGH EVERY MESH
OPENING WITH DOUBLE LOOPS SPACED AT NO MORE THAN 6 INCHES.
5. INDIVIDUAL GABION UNITS SHALL BE CONNECTED USING STAINLESS STEEL FASTENERS SPACED AT A MAXIMUM OF EVERY 4 INCHES. STAINLESS STEEL FASTENERS SHALL BE CLOSED USING A
PNEUMATIC TOOL PER THE MANUFACTURER'S RECOMMENDATIONS. STAINLESS STEEL FASTENERS SHALL HAVE A CROSS SECTIONAL DIAMETER OF 0.120 INCHES. WHEN CLOSED, THE
FASTENER SHOULD HAVE A NOMINAL OVERLAP OF 1 INCH. GABION UNITS SHALL BE SECURED ALONG ALL VERTICAL AND TOP EDGES. FOR STACKED UNITS, THE UPPER AND LOWER BASKETS
SHALL BE CONNECTED WITH FASTENERS ALONG FRONT AND BACK EDGES.
6. GABIONS SHALL BE FILLED WITH SOUND RIP RAP WITH A MINIMUM SIZE OF 4 INCHES AND A MAXIMUM SIZE OF 8 INCHES. RIP RAP SHALL MEET THE REQUIREMENTS OF SECTION 1042 RIP RAP
MATERIALS OF THE 2012 NORTH CAROLINA DEPARTMENT OF TRANSPORTATION (NCDOT) STANDARD SPECIFICATIONS FOR ROADS AND STRUCTURES. ALTERNATE GRADATIONS MAY BE
SUBMITTED FOR USE BUT SHALL NOT BE USED PRIOR TO APPROVAL BY THE ENGINEER
7. GABIONS SHALL BE FILLED IN THREE EQUAL LAYERS TOTALING THE HEIGHT OF EACH GABION. SOME MANUAL PLACEMENT OF ROCKS TO REDUCE EXCESSIVE VOIDS WILL BE REQUIRED.
F GABIONS SHALL BE OVERFILLED BY APPROXIMATELY 1 TO 2 INCHES SUCH THAT LIDS MUST BE STRETCHED FOR CLOSURE. A LID CLOSURE TOOL SHALL BE USED PER THE MANUFACTURER'S
RECOMMENDATIONS TO CLOSE LIDS.
8. WHEN PLACED LATERALLY, GABIONS SHALL BE LAID TRANSVERSELY TO THE DIRECTION OF THE WATER FLOW.
9. WHEN PLACED, GABIONS SHALL BE IN INTIMATE CONTACT WITH BEDDING AGGREGATE.
10. BEDDING MATERIAL FOR GABIONS SHALL BE COMPRISED OF AGGREGATE MEETING THE GRADATION REQUIREMENTS ON TABLE 1005-1 FOR NCDOT # 57 AGGREGATE AND SECTION 1014 OF
THE 2012 NCDOT STANDARD SPECIFICATIONS FOR ROADS AND STRUCTURES.
11. WOVEN GEOTEXTILE SHALL CONSIST OF POLYPROPYLENE YARNS AND BE RESISTANT TO BIOLOGICAL DEGRADATION AND NATURALLY OCCURRING CHEMICALS, ALKALI, AND ACIDS. WOVEN
GEOTEXTILE SHALL MEET THE FOLLOWING MINIMUM REQUIREMENTS:
PHYSICAL PROPERTY (TEST METHOD) TEST VALUE
GRAB TENSILE STRENGTH (ASTM D4632) 200 LBS
GRAB TENSILE ELONGATION (ASTM 1 10%
TRAPEZOIDAL TEAR STRENGTH (ASTM 1 75 LBS
UV RESISTANCE (500 HOURS) (ASTM 1 70% STRENGTH RETENTION
APPARENT OPENING SIZE (ASTM 1 0.43 MM
CBR PUNCTURE STRENGTH (ASTM 1 700 LBS
INCHES 1 2 3 TENTHS 10 20 30
8+50
9+00
9+50
D A - 36 INCH TO 42 INCH DRAINAGE PIPE
10+00
10+50
11+00
OOOO \ \
0
O \
0 00 \
o \
O \
OOOO \ \
o \
O \
O \
OO \
11+50
550
540
530
520
510
500
490
480
475
12+00
LEGEND
— — — — — — EXISTING GRADE
EXISTING BOTTOM OF ASH
SEQUENCE C POST -CLOSURE GRADE (TOP OF
RIPRAP)
8 OZ/SY GEOTEXTILE
TOP OF CHANNEL
PROPOSED STORM PIPE AND JUNCTION BOX
EXISTING STORM PIPE
RIPRAP
CONCRETE PLUG
GROUT
REFERENCES:
REF. 1: DWG. "DAN RIVER POWER PLANT 48" DIA. PIPE S.W. PIPE SECTION AND PLAN VIEW"
DATE: 04/17/2014
REF. 2: DWG. NO. D -1039 -M -I Rev. No. 3 APPROVED 11/7/1980
REF. 3: DWG. "DAN RIVER POWER PLANT 42"/36" DIA. PIPE S.W. PIPE SECTION AND PLAN
VIEW" DATE: 04/17/2014
REF. 4: EXISTING TOPOGRAPHIC INFORMATION WAS PRODUCED FROM
PHOTOGRAMMETRIC METHODS FROM AERIAL PHOTOGRAPHY OBTAINED ON
FEBRUARY 7, 2014 BY LDSI, INC.
DAN RIVER WATER
SURFACE AT TIME OF
CONSTRUCTION
EXISTING GRADE
30 0 30 .0 FT
0
co
0
N)
n
0
I�
C)f
w
TYPICAL GABION OUTLET PROFILE
25 YEAR, 24 HOUR
EXISTING
EXISTING 36" RCP
RIPRAP GABION DETAIL
1
1 1"=4'
WATER SURFACE
ELEVATION: 535.6'
PIPE INVERT
�
— — — — _ POSSIBLE SLIP -LINE
TITLE
EXISTING GRADE
DAM DECOMMISSIONING PLAN -SEQUENCE C
wood.DAN
RIVER STATION
—F—
Wood Environment &
-- -- --
-- -- -- — -- --7�
OF PIPE
ESTIMATED BOTTOM
OF ASH
Infrastructure Solutions, Inc.
APPROXIMATE AREA OF POTENTIAL HEADWALL
4795 MEADOW WOOD LANE, SUITE 310 EAST
CHANTILLY, VA 20151
FOR
TEL: [phone], FAX [phone]
FOR PERMITTING
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
EXCAVATION. LOCATION
EXCAVATION VOLUME IS
SEAL
fir
SCALE: AS SHOWN
DUKE
DES:
DFTR.
CAL
DWG TYPE: DWG
L
CAL
JOB NO: 7810-15-0290
ENERGY®
CHKD:
CHR
EXISTING GRADE
APPROXIMATELY 460 Cy
CHR
FILENAME: WSA-3
PIPE PROFILE.dwg
APPD:
CHR
OF WETLAND AREA
RESTORE GRAVITY DRAINAGE
WORK MAY INCLUDE REGRADING OF BY REMOVING THE
PROPOSED
JUNCTION BOX
REVISION
-
AN
22"x34x34 "
FIGURE -03
0
REV DATE JOB NO. PROJECT TYPE DES DFTR CHKD ENGR DESCRIPTION
6 7
8
9
10
WETLAND TO A DEPTH OF 18 INCHES TEMPORARY PIPE CAP
8 OZ/SY GEOTEXTILE TO BE PLACED ON
OR LESS BELOW EXISTING GRADESUBGRADE
TO REMOVE ACCUMULATED CCR
BEFORE PLACING RIPRAP
SEQUENCE C
PROPOSED
MATERIAL (IF ANY) AND TO
PROMOTE DRAINAGE.
42" HDPE
POST -CLOSURE GRADES
5
0+50
-0+25 0+00
1+00
1+50
ESTIMATED BOTTOM OF ASH
2+00
EXISTING GRADE
2+50
3+00
3+50
4+00
4+50
5+00
ORDINARY HIGH WATER MARK
APPROX. ELEVATION 486.621'
550
540
530
520
510
500
490
480
475
5+50
5+50
6+00
6+50
7+00
3.0' 6' 3.0'
(OR ENGINEER -APPROVED ALTERNATE)
TYPICAL GABION OUTLET SECTION
7+50
8+00
PROJECTED TOP OF -
GABION BASKETS
FLOW LINE OF -
OUTLET DITCH
�I
8 OZ/SY NON -WOVEN GEOTEXTILE ---'
18 -IN. THICK GABION MATTRESS
6 -IN. NCDOT NO. 57 STONE CUSHION LAYER
MIRAFI 50OX WOVEN GEOTEXTILE
(OR ENGINEER -APPROVED ALTERNATE)
NOTES:
1. UNLESS DIRECTLY IN CONFLICT WITH REQUIREMENTS SET FORTH IN THE PROJECT NOTES AND DRAWINGS, GABIONS SHALL BE ASSEMBLED PER THE MANUFACTURER'S RECOMMENDATIONS.
2. GABIONS SHALL BE COMPRISED OF DOUBLE TWISTED HEXAGONAL ZINC COATED WIRE MESH WITH POLYVINYL CHLORIDE (PVC) COATING CONFORMING TO THE FOLLOWING REQUIREMENTS:
a. THE MESH WIRE SHALL HAVE A CROSS SECTIONAL CORE DIAMETER OF A MINIMUM OF 0.1063 INCHES WITH AN OUTER CROSS SECTIONAL DIAMETER OF A MINIMUM OF 0.1496 INCHES.
E b. THE SELVEDGE WIRE SHALL HAVE A CROSS SECTIONAL INTERNAL DIAMETER OF 0.134 INCHES AND AN EXTERNAL CROSS SECTIONAL DIAMETER OF 0.174 INCHES.
c. PVC COATING SHALL HAVE A MINIMUM THICKNESS OF 0.015 INCHES. ABRASION RESISTANCE OF PVC COATING SHALL BE LESS THAN 12% WEIGHT LOSS IN ACCORDANCE WITH ASTM D1242
AND A PROJECTED DURABILITY LIFE OF 70 YEARS WHEN TESTED IN ACCORDANCE WITH UL 7468.
d. GABION MESH SHALL BE A MESH TYPE 8 X 10 WITH NOMINAL SIZE OF 3'/4 " BY 4'/2".
3. THE CONTRACTOR SHALL TAKE CARE NOT TO DAMAGE THE PVC COATING DURING ASSEMBLY, TRANSPORTATION, PLACEMENT, AND FILLING. THE OWNER RESERVES THE RIGHT TO REJECT
GABIONS WHICH HAVE BEEN DAMAGED PRIOR TO FINAL ACCEPTANCE OF THE WORK.
4. GABIONS MAY BE ASSEMBLED USING PVC COATED LACING WIRE PER THE MANUFACTURER'S RECOMMENDATIONS, USING ALTERNATING SINGLE AND DOUBLE LOOPS THROUGH EVERY MESH
OPENING WITH DOUBLE LOOPS SPACED AT NO MORE THAN 6 INCHES.
5. INDIVIDUAL GABION UNITS SHALL BE CONNECTED USING STAINLESS STEEL FASTENERS SPACED AT A MAXIMUM OF EVERY 4 INCHES. STAINLESS STEEL FASTENERS SHALL BE CLOSED USING A
PNEUMATIC TOOL PER THE MANUFACTURER'S RECOMMENDATIONS. STAINLESS STEEL FASTENERS SHALL HAVE A CROSS SECTIONAL DIAMETER OF 0.120 INCHES. WHEN CLOSED, THE
FASTENER SHOULD HAVE A NOMINAL OVERLAP OF 1 INCH. GABION UNITS SHALL BE SECURED ALONG ALL VERTICAL AND TOP EDGES. FOR STACKED UNITS, THE UPPER AND LOWER BASKETS
SHALL BE CONNECTED WITH FASTENERS ALONG FRONT AND BACK EDGES.
6. GABIONS SHALL BE FILLED WITH SOUND RIP RAP WITH A MINIMUM SIZE OF 4 INCHES AND A MAXIMUM SIZE OF 8 INCHES. RIP RAP SHALL MEET THE REQUIREMENTS OF SECTION 1042 RIP RAP
MATERIALS OF THE 2012 NORTH CAROLINA DEPARTMENT OF TRANSPORTATION (NCDOT) STANDARD SPECIFICATIONS FOR ROADS AND STRUCTURES. ALTERNATE GRADATIONS MAY BE
SUBMITTED FOR USE BUT SHALL NOT BE USED PRIOR TO APPROVAL BY THE ENGINEER
7. GABIONS SHALL BE FILLED IN THREE EQUAL LAYERS TOTALING THE HEIGHT OF EACH GABION. SOME MANUAL PLACEMENT OF ROCKS TO REDUCE EXCESSIVE VOIDS WILL BE REQUIRED.
F GABIONS SHALL BE OVERFILLED BY APPROXIMATELY 1 TO 2 INCHES SUCH THAT LIDS MUST BE STRETCHED FOR CLOSURE. A LID CLOSURE TOOL SHALL BE USED PER THE MANUFACTURER'S
RECOMMENDATIONS TO CLOSE LIDS.
8. WHEN PLACED LATERALLY, GABIONS SHALL BE LAID TRANSVERSELY TO THE DIRECTION OF THE WATER FLOW.
9. WHEN PLACED, GABIONS SHALL BE IN INTIMATE CONTACT WITH BEDDING AGGREGATE.
10. BEDDING MATERIAL FOR GABIONS SHALL BE COMPRISED OF AGGREGATE MEETING THE GRADATION REQUIREMENTS ON TABLE 1005-1 FOR NCDOT # 57 AGGREGATE AND SECTION 1014 OF
THE 2012 NCDOT STANDARD SPECIFICATIONS FOR ROADS AND STRUCTURES.
11. WOVEN GEOTEXTILE SHALL CONSIST OF POLYPROPYLENE YARNS AND BE RESISTANT TO BIOLOGICAL DEGRADATION AND NATURALLY OCCURRING CHEMICALS, ALKALI, AND ACIDS. WOVEN
GEOTEXTILE SHALL MEET THE FOLLOWING MINIMUM REQUIREMENTS:
PHYSICAL PROPERTY (TEST METHOD) TEST VALUE
GRAB TENSILE STRENGTH (ASTM D4632) 200 LBS
GRAB TENSILE ELONGATION (ASTM 1 10%
TRAPEZOIDAL TEAR STRENGTH (ASTM 1 75 LBS
UV RESISTANCE (500 HOURS) (ASTM 1 70% STRENGTH RETENTION
APPARENT OPENING SIZE (ASTM 1 0.43 MM
CBR PUNCTURE STRENGTH (ASTM 1 700 LBS
INCHES 1 2 3 TENTHS 10 20 30
8+50
9+00
9+50
D A - 36 INCH TO 42 INCH DRAINAGE PIPE
10+00
10+50
11+00
OOOO \ \
0
O \
0 00 \
o \
O \
OOOO \ \
o \
O \
O \
OO \
11+50
550
540
530
520
510
500
490
480
475
12+00
LEGEND
— — — — — — EXISTING GRADE
EXISTING BOTTOM OF ASH
SEQUENCE C POST -CLOSURE GRADE (TOP OF
RIPRAP)
8 OZ/SY GEOTEXTILE
TOP OF CHANNEL
PROPOSED STORM PIPE AND JUNCTION BOX
EXISTING STORM PIPE
RIPRAP
CONCRETE PLUG
GROUT
REFERENCES:
REF. 1: DWG. "DAN RIVER POWER PLANT 48" DIA. PIPE S.W. PIPE SECTION AND PLAN VIEW"
DATE: 04/17/2014
REF. 2: DWG. NO. D -1039 -M -I Rev. No. 3 APPROVED 11/7/1980
REF. 3: DWG. "DAN RIVER POWER PLANT 42"/36" DIA. PIPE S.W. PIPE SECTION AND PLAN
VIEW" DATE: 04/17/2014
REF. 4: EXISTING TOPOGRAPHIC INFORMATION WAS PRODUCED FROM
PHOTOGRAMMETRIC METHODS FROM AERIAL PHOTOGRAPHY OBTAINED ON
FEBRUARY 7, 2014 BY LDSI, INC.
DAN RIVER WATER
SURFACE AT TIME OF
CONSTRUCTION
EXISTING GRADE
30 0 30 .0 FT
0
co
0
N)
n
0
I�
C)f
w
TYPICAL GABION OUTLET PROFILE
RIPRAP GABION DETAIL
1
1 1"=4'
TITLE
DAM DECOMMISSIONING PLAN -SEQUENCE C
wood.DAN
RIVER STATION
—F—
Wood Environment &
WSA-3 PIPE PROFILE AND GABION DETAIL
Infrastructure Solutions, Inc.
4795 MEADOW WOOD LANE, SUITE 310 EAST
CHANTILLY, VA 20151
FOR
TEL: [phone], FAX [phone]
FOR PERMITTING
LICENSURE: NC ENG: F-1253 NC GEOLOGY: C-247
SEAL
fir
SCALE: AS SHOWN
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DES:
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DWG TYPE: DWG
L
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JOB NO: 7810-15-0290
ENERGY®
CHKD:
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DATE: 2/11/2019
ENGR:
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FILENAME: WSA-3
PIPE PROFILE.dwg
APPD:
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DWG SIZE
DRAWING NO.
REVISION
0 2/11/2019 7810-15-0290 DAM DECOMMISSIONING CAL CAL CHR CHR INDIVIDUAL PERMIT MODIFICATION
AN
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FIGURE -03
0
REV DATE JOB NO. PROJECT TYPE DES DFTR CHKD ENGR DESCRIPTION
6 7
8
9
10
Plotted By: Lash, Christa Sheet Set: USACE PERMIT FIGURES Layout: WSA-3 PIPE PROFILE February 11, 2019 04:04: 47pm P:\D7526\Project\DUKE ENERGY\Dan River\7810150290 Emergent Issues\08 PAB CCR Qty\USACE Permit Figures\WSA3 PIPE PROFILE.dwg

Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
APPENDIX B
wood.
NCNHP DATABASE SEARCH QUERY

■ MEN Roy Cooper, Governor
■� NC DEPARTMENT OF Susi Hami9ton. Secretary
■■Tamm NATURAL AND CULTURAL RESOURCES
■ ■o■
Walter Clark. Director, Land and Water Stewardship
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DEPARTMENT OF NATURAL AND CULTURAL RESOURCES
(k 121 W. JOMES STREET, RALEIGH_ r`iC 27003 • 1651 MAIL SCRVICE CENTER, PALEIGH, NC 27699
OFCh15.707.9120 • FAX [phone]

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Wetland Master Plan — Addendum 1
Dan River Plant Ash Basin Closure
Rockingham County, North Carolina
Project No. 7810150290
APPENDIX C
L"A re m*e,
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ADJACENT LANDOWNER INFORMATION

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