NC0000396_Other Agency Documents_20180914

•
le:s DUKE
ENERGY
PROGRESS Garry A.Whisnant
Plant General Manager
Asheville Steam Electric Plant
Certified Mail: 7014 1820 0001 7891 4791
Duke Energy Progress
ASVL PLT/200 CP&L Dr
File: 12520A Arden,NC 28704
o: 828-687-5201
September 14, 2018 t. 828-687-5204
[e-mail]
Ms.Julie Grzyb, Supervisor
NPDES Complex Wastewater Permitting
NC DEQ/DWR/WQ Permitting Section
1617 Mail Service Center
Raleigh NC 27699-1617
Subject: Asheville Steam Station,NPDES Permit NC0000396
New Combined Cycle Facility 316(b) Report Submittal
Dear Ms. Grzyb,
Enclosed please find the required reports necessary per the 316(b)Existing Facilities Rule(40 CFR
125.95(b)(1)) for the Asheville Steam Station,NPDES Permit NC0000396. We believe that the provided
reports are complete and satisfies the Rule's requirements. Specifically,the enclosed reports are to
support new combined cycle units that are currently under construction. Soon after commercial operation
of the new combined units,the existing two coal-fired units with once-through cooling will be retired.
Relative to the 316(b)Existing Facilities Rule for the new combined cycle units,following are the major
characteristics which are fully described in the reports:
• Cooling type: closed-cycle recirculating cooling with mechanical draft towers
• Through-screen velocity for makeup pumps: 0.049 feet/second
• Design maximum withdrawal: 5.2 MGD (includes water for non-cooling needs)
• Average makeup intake structure withdrawal: 2.85 MGD
• Cooling tower blowdown: minimized via optimized cycles of concentration
The design of the new combined cycle units meets or exceeds the impingement and entrainment standards
imposed by the 316(b) Rule. Closed-cycle recirculating cooling with minimized blowdown satisfies the
required entrainment standard. Compliance with the impingement standard is with closed-cycle cooling
and an intake through-screen velocity approximately ten times less than the 0.5 feet/second alternative.
The existing cooling water intake structure will be modified for installation of finer mesh fixed screen and
installation of new lower flow pumps. No other modifications to the existing cooling water structure will
be performed.
Per the 316(b) Rule, a permittee is required to submit the required reports at least 180 days prior to
cooling water withdrawals for a new unit at an existing facility(40 CFR 125.95(b)), such as the new
Asheville combined cycle units. Although these reports are timely submitted as required,we would

• Asheville Steam Station,NPDES Permit NC0000396
New Combined Cycle Facility 316(b)Report Submittal
Page 2
sincerely appreciate the Department's expeditious review to preclude any potential construction schedule
conflicts.
Please contact Tina Woodward(704-382-4585) or Michael Smallwood(704-382-4117)if you have any
questions regarding the enclosed 316(b) Rule reports to support the new Asheville combined cycle units.
Sincerely,
Mr.Jeff McFee
Asheville Steam Station, Acting Plant Manager
cc: Sergei Chernikov
Complex NPDES Permit Supervisor
1617 Mail Service Center
Raleigh, NC 27699-1617

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Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
• Contents
Page
Executive Summary 1
1 Introduction 2
2 Source Water Physical Data [§122.21(r)(2)] 6
2.1 Description of Source Waterbody 6
2.2 Characterization of Source Waterbody 7
2.2.1 Geomorphology 7
2.2.2 Hydrology 7
2.2.3 Water Quality 7
2.3 Determination of Area of Influence 11
2.3.1 Methods—Desktop Calculation 12
2.3.2 Results—Desktop Calculations 13
3 Cooling Water Intake Structure Data [§122.21(r)(3)] 15
3.1 Configuration 15
• 3.2 Operation 17
3.3 Latitude and Longitude of Structures 18
3.4 Engineering Drawings of CWIS 18
4 Source Water Baseline Biological Characterization Data [§122.21(r)(4)] 19
4.1 Review of Available Biological Data 19
4.2 Species and Relative Abundance near the CWIS 19
4.2.1 Lake Julian Environmental Monitoring Program 19
4.2.2 Conclusions from Lake Julian Sampling Program 22
4.3 Primary Growth Period 23
4.3.1 Period of Peak Abundance for Relevant Taxa 24
4.4 Seasonal and Daily Activities of Organisms in the Vicinity of the CWIS 25
4.5 Species and Life Stages Susceptible to Impingement and Entrainment 27
4.5.1 Impingement 27
4.5.2 Entrainment 28
4.5.3 Life History Information for Species Susceptible to Entrainment 30
4.6 Threatened, Endangered, and Other Protected Species Susceptible to Impingement
, and Entrainment at the CWIS 32
4.7 Documentation of Consultation with Services 34
4.8 Incidental Take Exemption or Authorization from Services 34
4.9 Methods and Quality Assurance Procedures for Field Efforts 34
4.10 Protective Measures and Stabilization Activities 35
Duke Energy I ii

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
4.11 Fragile Species 35
5 Cooling Water System Data [§122.21(r)(5)] 37
5.1 Cooling Water System 37 •
5.1.1 Proportion of Design Flow Used in the Cooling Water System 41
5.1.2 Temporal Characteristics of Cooling Water System Operation 41
5.1.3 Distribution of Water Reuse 42
5.1.4 Description of Reductions in Total Water Withdrawals 42
5.1.5 Description of Cooling Water Used in Manufacturing Process 42
5.1.6 Proportion of Source Waterbody Withdrawn 42
5.2 Design and Engineering Calculations 42
5.3 Description of Existing Impingement and Entrainment Reduction Measures 43
5.3.1 Asheville Plant 43
5.3.2 The ACC 43
5.3.3 Best Technology Available for Entrainment 44
6 Chosen Method(s)of Compliance with Impingement Mortality Standard [§122.21(r)(6)] 45
6.1 Design TSV 45
6.2 Requirements of Make-up Water Minimization for Closed-Cycle Recirculating System 45
7 Entrainment Performance Studies [40 CFR§ 122.21(r)(7)] 47
7.1 Site-Specific Studies 47
7.2 Studies Conducted at Other Locations 47
8 Operational Status [§122.21(r)(8)] 48
8.1 Asheville Plant Units 1-4 48
8.2 ACC Units 5-8 48
8.3 Major Upgrades in Last 15 Years 48
8.4 Descriptions of Consultation with Nuclear Regulatory Commission 48
8.5 Other Cooling Water Uses for Process Units 48
8.6 Description of Current and Future Production Schedules 48
8.7 Description of Plans or Schedules for New Units Planned within 5 years 49
9 New Units [§122.21(r)(14)] 50
9.1 BTA Standards for Impingement Mortality and Entrainment for New Units at Existing
Facilities 50
10 References 51
Duke Energy I iii

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
Appendices
Appendix A Permit for Impounding and Maintenance of Impounded Water Issued in 1963
•
Appendix B ..Asheville Combined Cycle Station §122.21(r)(2)—(8), (14) Submittal Requirement Checklist
Appendix C Asheville Combined Cycle Station, Engineering Calculations for Through-Screen Velocity
Appendix D Asheville Combined Cycle Station, Design Drawings
Duke Energy I iv

Clean Water Act§316(b)Compliance Submittal FIN
Asheville Combined Cycle Station J
Tables
Page
Table 1-1. Facility and Flow Attributes and Permit Application Requirements 2
Table 1-2. Submittal Requirements for New Unit(s) at an Existing Facility for Compliance Under
Clean Water Act§316(b) §122.21(r)(2)-(8)and (r)(14) 5
Table 2-1. Annual Mean Concentration for Select Parameters Documented in Surface Water
Samples Collected in Lake Julian (Station D2) (Progress Energy 2013) 10
Table 2-2. Summary of Input Parameters for TSV Calculations of CWIS on Lake Julian 14
Table 3-1. Existing and Repurposed Cooling Water Intake Structure Components 16
Table 3-2. Cooling Water Intake Structure Coordinate Information (Source: DEP 2005, DEP
2007) 18
Table 3-3. List of Engineering Drawings for ACC Intakes 18
Table 4-1. Relative Abundance of Fish Collected in Electrofishing Samples on Lake Julian, 2000,
2010, 2015, 2016 (CP&L 2001 and Progress Energy 2013, DEP 2017b) 21
Table 4-2. Mean Number per 24-Hour Set of Fish Collected during Gillnet Sampling on Lake
Julian, 2000 (Source: CP&L 2001) 22
Table 4-3. Known Spawning and Recruitment Period of Native Species with Documented
Occurrence in Lake Julian, North Carolina (Sources: Rohde et al. 1994; Rohde et al.
2009; Etnier and Starnes 1993 ) 24
Table 4-4. Seasonal and Daily Activities of Species Present in Lake Julian (Sources: Rohde et al.
2009; Rohde et al. 1994; Etnier and Starnes 1993) 25
Table 4-5. Entrainment Potential for Fish Species Identified in Lake Julian 29
Table 4-6. Rare, Threatened, or Endangered (RTE)Aquatic Species Listed for Buncombe
County, North Carolina, and Record of Occurrence or Potential to Occur in Lake Julian 33
Table 4-7. List of Fragile Species as Defined by the EPA and their Occurrence in Lake Julian
and/or the French Broad River near Asheville Combined Cycle Station 35
Table 5-1. Water Balance Diagram and Associated Flows under Various Design Conditions for
the ACC (Source: CB&I 2018) 1 40
Table 6-1. Site-Specific Design of ACC Closed-Cycle Cooling System (CB&I 2018) 46
Duke Energy I v

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
• Figures
Page
•
Figure 1-1. Site Layout at Asheville Combined Cycle Station, Buncombe County, North Carolina 3
Figure 2-1. Map of French Broad-Holston Basin Hydrologic Unit Code 06010105 8
Figure 2-2. Duke Energy Progress Environmental Monitoring Program Water Quality Sampling
Stations on Lake Julian (Progress Energy 2013) 9
Figure 3-1.Asheville Combined Cycle Cooling Water Intake Structure on Lake Julian, Buncombe
County, North Carolina 15
Figure 3-2. Layout of the Repurposed Lake Julian Cooling Water Intake Structure(not to scale) 16
Figure 3-3. Photograph of a 1-inch Hexagonal Mesh Screen Panel Employed at the Cooling
Water Intake Structure on Lake Julian 17
Figure 4-1. Shoreline Habitat Types and Locations Sampled with Nighttime Electrofishing in Lake
Julian, 2000-2016 (CP&L 2001, Progress Energy 2013, DEP 2017b) 20
Figure 5-1. Water Balance Diagram of the Asheville CombinedCycle Station, Arden, North
Carolina (Source: CB&I 2018) 38
Duke Energy I vi

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station JJ
Acronyms and Abbreviations
°C degrees Celsius
°F degrees Fahrenheit
ACC Asheville Combined Cycle Station
AIF actual intake flow
AOI area of influence
Asheville Plant Asheville Steam Electric Plant
BTA Best Technology Available
CCRS closed-cycle recirculating system
CFR Code of Federal Regulations
COC •
cycles of concentration
CP&L Carolina Power and Light Company
CWA Clean Water Act
CWIS cooling water intake structure
DIF design intake flow
Director NPDES Director
DO dissolved oxygen
DEP Duke Energy Progress, LLC
EPA U.S. Environmental Protection Agency
EPRI Electric Power Research Institute
fps feet per second
ft msl feet above mean sea level
gpm gallons per minute
HRSG heat recovery steam generator
HUC Hydrologic Unit Code
IPAC Information for Planning and Consultation
m meters
pS/cm micro Siemens per centimeter
MGD million gallons per day
mg/L milligrams per liter
MW megawatt
NCDEQ North Carolina Department of Environmental Quality
NCDNCR North Carolina Department of Natural and Cultural Resources
NPDES National Pollutant Discharge Elimination System
NTU Nephelometric Turbidity Units
Program Environmental Monitoring Program
RTE Rare,threatened, or endangered
Rule Clean Water Act§316(b)rule
TSV through-screen velocity
USFWS 1 U.S. Fish and Wildlife Service
WOTUS Waters of the United States
Duke Energy I vii

Clean Water Act§316(b)Compliance Submittal FIN
Asheville Combined Cycle Station
Executive Summary
On August 15, 2014, regulations implementing §316(b) of the Clean Water Act(CWA) for
existing facilities (the Rule) were published in the Federal Register with an effective date of
October 14, 2014. Facilities subject to the Rule are required to develop and submit technical
material in accordance with §122.21(r) that will be used by the National Pollutant Discharge
Elimination System (NPDES) permit Director(Director) to make a Best Technology Available
(BTA) determination for the facility.
Duke Energy Progress, LLC (DEP) is constructing a new combined cycle unit at the existing
Asheville Steam Electric Plant(Asheville Plant) in Buncombe County, North Carolina. The
generation capacity of the Asheville Plant will be replaced with the Asheville Combined Cycle
Station (ACC), which will consist of two combined cycle power blocks with a summer/winter net
electrical generating capacity of 250 MW/280 MW per block. Approximately 36 percent of this
generation will be produced from a steam cycle turbine that requires cooling water; however,
the ACC will utilize closed-cycle cooling towers, which will reduce cooling water withdrawals
from the current average of 225 MGD to a proposed average of 2.85 MGD, and will eliminate
thermal inputs to Lake Julian from the existing coal-fired units. The ACC will utilize the existing
CWIS on Lake Julian for raw water supply, including cooling tower make-up water.
The new ACC is defined as a "new unit" at an existing facility' per 40 CFR 125.92(u). As such,
• DEP is providing the following information, as required at §122.21(r)(2)-(8) and (r)(14), at least
180 days prior to the commencement of cooling water withdrawals for the operation of the new
unit. Functional testing is scheduled to begin in March, 2019 and the commercial operation date
is currently scheduled for November 2019. The existing Asheville Plant will be retired upon
commencement of the new combined cycle operations.
To meet the impingement mortality and entrainment reduction standards in §125.94(e), the ACC
will be equipped with closed-cycle recirculating mechanical draft cooling towers. The §122.21(r)
submittal material provided herein supports a conclusion that the ACC will fully meet the new
unit BTA standards at §125.94(e) for impingement and entrainment reductions and minimizes
potential adverse environmental impacts.
' The Rule states in§ 125.92(u)that a"New unit means a new`stand-alone'unit at an existing facility where
construction of the new units begins after October 14, 2014 and that does not otherwise meet the definition of a
new facility at§ 125.83 or is not otherwise already subject to subpart I of this part.A stand-alone unit is a separate
unit that is added to a facility for either the same general industrial operation or another purpose. A new unit may
have its own dedicated cooling water intake structure, or the new unit may use an existing or modified cooling water
intake structure."
Duke Energy 11

Clean Water Act§316(b)Compliance Submittal Inun
Asheville Combined Cycle Station
1 Introduction
Section 316(b) was enacted under the 1972 Clean Water Act (CWA), which also introduced the
National Pollutant Discharge Elimination System (NPDES) permit program. Certain facilities with
NPDES permits are subject to §316(b) requirements, which mandate that the location, design,
construction, and capacity of the facility's cooling water intake structure (CWIS)2 reflect Best
Technology Available (BTA) for minimizing potential adverse environmental impacts.
On August 15, 2014, regulations implementing §316(b) of the final CWA rule (Rule) for existing
facilities were published in the Federal Register with an effective date of October 14, 2014 (EPA
2014). The Rule applies to existing facilities that withdraw more than 2 million gallons per day
(MGD) from Waters of the United States (WOTUS), use at least 25 percent of that water
exclusively for cooling purposes, and have an NPDES permit.
Facilities subject to the Rule are required to develop and submit technical material that will be
used by the NPDES Permit Director (Director) to make a BTA determination for the facility. The
actual intake flow (AIF)3 and design intake flow (DIF)4 at a facility determine which submittals
will be required, as shown in Table 1-1.
Table 1-1. Facility and Flow Attributes and Permit Application Requirements
Facility and Flow Attributes Applicable Requirements
Existing facility with DIF of 2 MGD or less, or less Best Professional Judgment of Director
than 25 percent of AIF used for cooling purposes
Existing facility with DIF greater than 2 MGD and
§122.21(r)(2)-(8)
AIF less than 125 MGD
Existing facility with DIF greater than 2 MGD and
§122.21(1)(2)-(13)
AIF greater than 125 MGD
New units at existing facility* §122.21(r)(2), (3), (5), (8), and(14)and applicable
paragraphs in(r)(4), (6), and(7)of§122.21(r)
*ACC falls into this category based on the withdrawal volumes anticipated under the proposed operational
scenario.
2 A CWIS is defined as the total physical structure and any associated constructed waterways used to withdraw
cooling water from WOTUS. The CWIS extends from the point at which water is first withdrawn from WOTUS up to,
and including, the intake pumps.
3 AIF is defined as the average volume of water withdrawn on an annual basis by the CWIS over the past 3 years
initially and past 5 years for NPDES Permit Applications submitted after Oct. 14, 2019. The calculation of AIF
includes days of zero flow. AIF does not include flows associated with emergency and fire suppression capacity.
4 DIF is defined as the value assigned during the CWIS design to the maximum instantaneous rate of flow of water
the CWIS is capable of withdrawing from a source waterbody. The facility's DIF may be adjusted to reflect •
permanent changes to the maximum capabilities of the cooling water intake system to withdraw cooling water,
including pumps permanently removed from service, flow limit devices, and physical limitations of the piping. DIF
does not include values associated with emergency and fire suppression capacity or redundant pumps(i.e., back-
up pumps).
Duke Energy 12

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
Based on the Rule, facilities with an AIF of 125 MGD or less have fewer application submittal
requirements and will generally be required to select from the impingement compliance options
contained in the Rule. Facilities with an AIF in excess of 125 MGD are required to address both
impingement and entrainment, and provide specific entrainment studies, which may involve
extensive field studies and the analysis of alternative methods to reduce entrainment
(§122.21(r)(9)-(13)).
The existing Duke Energy Progress, LLC (DEP) Asheville Steam Electric Plant (Asheville Plant)
is located on Lake Julian in Buncombe County, North Carolina (Figure 1-1). Cooling water for
the existing plant is withdrawn from the CWIS on Lake Julian. Supplemental water to maintain
water levels in Lake Julian is withdrawn from an intake located on the adjacent French Broad
River.
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North Carolina contain survey information,and no attempt should be made
b represent any pert of this drawing as such
Figure 1-1. Site Layout at Asheville Combined Cycle Station, Buncombe County, North
Carolina
Duke Energy 13

Clean Water Act§316(b)Compliance Submittal F1JZ
Asheville Combined Cycle Station
Per Section 2 of the Mountain Energy Act, coal-fired operations at the Asheville Plant are
required to cease by January 31, 2020. NPDES permit proceedings for Asheville Plant began
prior to October 14, 2014 and DEP is expecting a permit to be issued with a 5-year permit term;
r
therefore, per 40 CFR 122.21(r)(1)(ii)(F), the permit application requirements listed in Table 1-1
are not applicable for the coal-fired units.
Existing generation at the Asheville Plant will be replaced with two combined cycle power
blocks, each with one combustion turbine, one heat recovery steam generator (HRSG), and one
steam turbine. The Asheville Combined Cycle Station (ACC) will employ closed-cycle
recirculating cooling towers, which will significantly reduce water withdrawal and remove thermal
impacts to Lake Julian. The ACC units will utilize the existing CWIS on Lake Julian for raw water
supply, including cooling tower make-up; therefore, the CWIS on Lake Julian is the point of
compliance for the Rule. The existing river intake on the French Broad River will continue to be
used for occasional withdrawals to offset drops in lake level resulting from low precipitation and
losses due to dam seepage, evaporation, and raw water withdrawals for the ACC operations.
The new ACC is defined as a "new unit" at an existing facility5 per 40 CFR 125.92(u). The new
ACC has a DIF greater than 2 MGD and an AIF less than 125 MGD and, therefore, is not
required to submit information detailed in §122.21(r)(10)-(r)(13) of the Rule. As such, DEP is
providing the information detailed in §122.21(r)(2)-(8) and (r)(14), and summarized in Table 1-2,
at least 180 days prior to the planned commencement of cooling water withdrawals for the
operation of the new unit. Cooling water withdrawals will commence during functional testing,
approximately six months prior to the scheduled commercial operation date of the units.
Functional testing is scheduled to begin in March 2019 and commercial operation is currently
scheduled to begin in November 2019. Appendix B provides a checklist summary of the specific
information needs listed under each of the §122.21(r)(2)-(8) and (r)(14) submittal requirements
and indicates how each of the requirements are addressed in this report.
5 The Rule states that"New unit"means a new"stand-alone" unit at an existing facility where construction of the new
units begins after October 14, 2014 and that does not otherwise meet the definition of a new facility at§ 125.83 or is
not otherwise already subject to subpart I of this part. A stand-alone unit is a separate unit that is added to a facility
for either the same general industrial operation or another purpose.A new unit may have its own dedicated cooling
water intake structure, or the new unit may use an existing or modified cooling water intake structure."
Duke Energy 14

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
• Table 1-2. Submittal Requirements for New Unit(s) at an Existing Facility for Compliance
Under Clean Water Act §316(b) §122.21(r)(2)-(8) and (r)(14)
. Submittal Requirements at Submittal Description
§122.21(r)
(2) Source Water Physical Characterization of the source waterbody including intake area of
Data influence is provided in Section 2.0.
Characterization of the cooling water intake system; includes drawings
(3) Cooling Water Intake and narrative; and a description of operations are provided in Section 3.0.
Structure Data A water balance diagram and description of the process are provided in
Section 5.0.
As appropriate for closed cooling, characterize the biological community in
Source Water Baseline the vicinity of the intake; life history summaries; susceptibility to
(4) Biological impingement and entrainment; existing data; identification of missing data;
Characterization Data threatened and endangered species and designated critical habitat
summary for action area; identification of fragile fish and shellfish species
list(<30 percent impingement survival).Addressed in Section 4.0.
Narrative description of cooling water system and intake structure
including water balance diagram; proportion of design flow used;water
(5) Cooling Water System reuse summary; proportion of source waterbody withdrawn(monthly);
Data seasonal operation summary;existing impingement mortality and
• entrainment reduction measures; flow/MW efficiency.Addressed in
Section 5.0.
Chosen Method of As appropriate for closed cooling , provide the facility's proposed
• Compliance with approach to meet the impingement mortality requirement(chosen from
(6) seven available options); provides detailed study plan for monitoring
Impingement Mortality compliance, if required by selected compliance option; addresses
Standard entrapment where required. Provided in Section 6.0.
As appropriate for closed cooling, summarize relevant entrainment studies
(7) Entrainment Performance (latent mortality,technology efficacy); can be from the facility or elsewhere
Studies with justification; studies should not be more than 10 years old without
justification; new studies are not required.Addressed in Section 7.0.
Provides operational status for each unit; age and capacity utilization for
the past 5 years; upgrades within last 15 years; uprates and U.S. Nuclear
(8) Operational Status Regulatory Committee relicensing status for nuclear facilities;
decommissioning and replacement plans; current and future operation as
it relates to actual and design intake flow. Provided in Section 8.0.
Identifies the chosen compliance method for the new unit; based on the
method selected will provide information to demonstrate closed-cycle
(14) New Units cooling or entrainment reductions that are commensurate with closed-
cycle cooling; may also include additional data and information, as
determined by the Director. Provided in Section 9.0.
Duke Energy 15

Clean Water Act§316(b)Compliance Submittal FN
Asheville Combined Cycle Station
2 Source Water Physical Data [§122.21 (r)(2)]
2. 1 Description of Source Waterbody
Once operational, the new ACC will withdraw raw water for cooling purposes at the existing
CWIS on Lake Julian, the source waterbody. An aerial photograph of the future location of the
ACC and its environs is shown on Figure 1-1 in Section 1 of this report.
Lake Julian and the adjacent French Broad River are located within the French Broad-Holston
River basin, which includes watersheds in North Carolina and Tennessee. The North Carolina
portion of the French Broad-Holston River basin is 2,830 square miles and lies entirely in the
Blue Ridge ecoregion. The French Broad River originates in Transylvania County, North
Carolina, and flows north for 210 miles through western North Carolina into Tennessee, where it
joins the Holston River near Knoxville to form the Tennessee River (NCDEQ 2017). The French
Broad-Holston River basin is predominantly forested; however, it also contains some of the
most populated urban areas in the region, including the mountain municipalities of Asheville,
Waynesville, Hendersonville, and Black Mountain, North Carolina.
Lake Julian was created to serve as part of the cooling system for the Asheville Plant by
impounding Powell's Creek, a tributary of the French Broad River (North Carolina State Board of
Health 1963). The freshwater lake reached full-pool elevation in June 1963 and the Asheville
Plant began commercial operation in 1964. The shoreline-situated CWIS is located within an
intake cove on the main body of Lake Julian. Cooling water for the existing coal units is currently
circulated from the main body of the lake through the plant and into the discharge arm. The
discharge arm of the lake has a surface area of 106 acres and a mean depth of 13 feet
(Progress Energy 2013). The water from the discharge arm returns to the intake side of the lake
via an opening underneath the railroad trestle (Figure 1-1). The main body of the lake has a
surface area of 215 acres, a maximum depth of 108 feet, and a mean depth of 30 feet. Average
surface water elevation on Lake Julian is approximately 2,160 feet above mean sea level (ft
msl). The average impounded volume (at elevation 2,160) is approximately 8,819 acre-feet.
Land use in Lake Julian's 4.8-square mile watershed is primarily residential and urban. Lake
Julian is a relatively steep-sided, deep lake devoid of aquatic vegetation and other types of
naturallyoccurringunderwater structure, resultingin less than optimal shallow-water fish habitat
P
(Progress Energy 2013). Artificial structures (submerged and cabled trees, fish reefs, etc.) have
been placed along shorelines by DEP during periodic fish habitat enhancement activities to
improve fish habitat in Lake Julian.
With the retirement of the coal units, cooling tower make-up water for the new ACC units will be
withdrawn from the existing CWIS on Lake Julian with the cooling tower blowdown being
discharged to an existing outfall on the French Broad River. As such, the remainder of this
document is focused on Lake Julian, the source waterbody for the ACC CWIS, for establishing
compliance with the Rule's impingement and entrainment BTA standards.
Duke Energy l 6

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
2.2 Characterization of Source Waterbody
To identify and characterize the primary source waterbody (i.e., Lake Julian), the following
resources were reviewed:
• Limnology of Lake Julian (2000, 2001, 2004, 2007, 2010) (CP&L 2001; Progress
Energy 2010, Progress Energy 2013); and
• Ecoregions of North Carolina (Griffith et al. 2002).
Data were compiled, synthesized, and are summarized below.
2.2.1 Geomorphology
Lake Julian is located within the Blue Ridge Level III ecoregion and, more specifically, the Broad
Basins (Level IV) of the Blue Ridge ecoregion. The Blue Ridge ecoregion extends from southern
Pennsylvania to northern Georgia and varies in topography from narrow ridges to hilly plateaus
to more mountainous areas with high peaks. The mostly forested slopes, high-gradient streams,
and rugged terrain occur over a mix of igneous, metamorphic, and sedimentary bedrock (Griffith
et al. 2002).
2.2.2 Hydrology
Lake Julian is located within the French Broad-Holston Basin, which is divided into eight U.S.
Geological Survey hydrologic units, each designated by a Hydrologic Unit Code (HUC). Lake
Julian lies within the Upper French Broad River subbasin HUC 06010105 (Figure 2-1). The
drainage area of the Upper French Broad River subbasin is approximately 1,864 square miles.
2.2.3 Water Quality
Water quality data from Lake Julian has been collected by DEP since 1973 as part of their
Environmental Monitoring Program (Program). The Program includes periodic data collections
targeting water chemistry, phytoplankton, zooplankton, benthic invertebrates, and fish
communities (Progress Energy 2013). The Program originally consisted of annual sampling at
select locations in Lake Julian (Figure 2-2), but was reduced in scope to a triennial frequency
beginning in 2001. Water quality sampling for Lake Julian is performed on alternate months (i.e.,
January, March, May, July, September, and November) at Stations A2 and D2 (depth profile
from surface to bottom) and at Station GS2 (i.e., February, April, June, August, October,
December) (see Figure 2-2). These data are summarized in the following section.
Water quality and limnological data collected from Lake Julian (Station D2) in 2000, 2001, 2004,
2007, and 2010 under the Program (Progress Energy 2013) are summarized in Table 2-1.
Duke Energy 17

Clean Water Act§316(b)Compliance Submittal FIN
Asheville Combined Cycle Station
LEGEND
Boone Fayette
8 Digit Hydrologic Units • Station Location
06010101 -North Fork Holston French Broad -Holston River
Basin
06010102-South Fork Holston Raeigt
County Boundaries
06010103-Watauga
'� i or-^g
D State Boundaries Summers
06010104 -Holston
DATA SOURCE.V:;AE4 51E.
Mercer
06010105-Upper French Broad
McDowell
06010106-Pigeon k }\''
l�, �r
06010107-Lower French Broad Q Miles 2 Gds
Bland
06010108-Nolichucky Tazewell
"je
Knox Russell E
Harlan Wythe
Smyth
Bell
Whitley Lee Scott .d'"� ' ashington .p„r
Carroll
r,, Grayson
§ Claiborne Hancock VIIjilliliarl
E Haw;.= Alleghany
Ashe Sum
Union
Gram e Washrgton
g Ca r
Hamblen
I Greene ga Wilkes
c
Jefferson
I e,w Mitchell
as #
^' Caldwell
Bison Yancey Alexander
Sevier I
t
&cunt t Iredell
Burke
9
ie McDowell Catawta
be Asheville Combined
H ----- Cycle Station
Swain
L ncoln
Graham
I Jackson Iowa Michigan
Pennsylvania
Pol lilanois Indiana Otii°
Cherokee Macon Trans 1a West Virginia Maryland
Delaware
Clay issoun Kentucky Virginia
"—""'" GreenvIle Tennessee --,• North Caroi na
Towns .. ,_
Rabun Pickens South Carolina
,.inion •
Oconee Mississippi Alabama Georgia
White Habersham Anderson ouisiana Florida
Figure 2-1. Map of French Broad-Holston Basin Hydrologic Unit Code 06010105
Duke Energy 18

Clean Water Act§316(b)Compliance Submittal Im)
Asheville Combined Cycle Station
LEGEND
River Intake
Outfall 001
Fi
CWIS
Existing Asheville Plant 1004, —
S......Ash Basins a�
,, Iii.i ,46 ka
1
0 Miles 0.25
DATA SOURCE:erg re!Corwbubrs •
o
141i.,4'''''''
-i
,s, it 7.: 1 .
•
F is ft.r
cul ; ''r
fi Reefs f
�` D2 Lake Julian AZ /
a utfll
�F.rmer
, Skimmer Wall rr-. xi • r':
•N'L `.�tT y GS2
Il.t;P`t:;a uli n ; - " I •
*4... it 1.—J L�A�RR,, Ctiq,9 . . T
s
1111 1
r . 1
a
i
I. ``*. 1964 r'......• ••. ,
•: 's ASH BASRA f 1982 ••.•
. ,+' ASH BASINS
•
F
til' • t
•4.•tl+t.' l y`[ i).112 ,r
Figure 2-2. Duke Energy Progress Environmental Monitoring Program Water Quality
Sampling Stations on Lake Julian (Progress Energy 2013)
Duke Energy 19

Clean Water Act§316(b)Compliance Submittal FIN
Asheville Combined Cycle Station
Table 2-1. Annual Mean Concentration for Select Parameters Documented in Surface
Water Samples Collected in Lake Julian (Station D2) (Progress Energy 2013)
Parameter 2000 2001 2004 2007 2010
Water Temperature(°C) 27.1 25.4 26.3 26.1 27.0
Specific Conductance at 25°C 118 110 94 118 105
(NS/cm)
Dissolved oxygen(mg/L) 7.1 7.6 6.9 7.5 7.2
Total dissolved solids(mg/L) 51 57 57 57 90
Turbidity(NTU) 2.5 1.8 1.0 2.2 3.0
Secchi disk transparency(m) 3.0 3.7 3.0 2.7 2.6
Chlorophyll a(pg/L) 4.6 2.3 6.2 7.1 13.2
Nutrients(mg/L)
Ammonia-N <0.05 0.06 0.02 <0.02 0.03
Nitrate+nitrite-N 0.07 0.04 0.12 0.06 0.019
Total nitrogen 0.39 0.34 0.53 0.49 0.028
Total phosphorus 0.012 0.009 0.010 0.010 0.010
Total organic carbon(mg/L) 3.6 2.4 1.9 2.0 2.7
Ions(mg/L)
Calcium 4.0 3.1 2.2 8.0 5.7
Chloride 10.7 9.0 9.5 12.5 10.0
Magnesium 2.7 2.5 2.3 2.5 2.8
Sodium 9.5 9.5 7.3 6.1 5.5
Sulfate 10 11.6 7.7 6.8 7.9
Total alkalinity(mg/L as CaCO3) 23 20 15 31 18
Hardness(mg equiv. CaCO3/L) 21 18 15 30 26
mg/L: milligrams per liter; m: meter; NTU: nephelometric turbity units
pg/L:micrograms per liter;CaCO3/L:calcium carbonate
The mean annual nutrient concentrations (i.e., ammonia-N, nitrate+nitrite-N, total nitrogen, total
phosphorus, total organic carbon) measured in Lake Julian from 2000 to 2010 were consistent
both spatially and temporally, with the exception of total nitrogen. Mean total nitrogen
concentrations were elevated in 2004 and 2007 compared to the remaining data years (i.e.,
2000, 2001, and 2010). No adverse trends were observed for water chemistry characteristics of
Lake Julian during the period of study.
Mean trace element concentrations (i.e., metals and metalloids) in surface water samples were
below their respective reporting limits during the data collection period. These data demonstrate
that Lake Julian water quality is consistently within state water quality limits. The retirement of
the coal units and subsequent operation of the new ACC units are not anticipated to have an
adverse effect on water chemistry in Lake Julian.
Duke Energy 110

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
• Water clarity (transparency) depth as measured by Secchi disk in Lake Julian was consistently
between 2.6 and 3.7 meters (m) (see Table 2-1). Turbidity was also low with an average of 2.1
NTU across all years. The annual mean concentrations of total dissolved solids were consistent
between 2000 and 2007, but displayed an increase during 2010 (Progress Energy 2013).
However, the overall values observed across the data period were within the normal variation
typically observed in comparably-sized reservoirs in the region.
Thermal stratification typically develops during the spring/summer months in the main body of
the lake resulting in low dissolved oxygen (DO) conditions (i.e., less than 4 mg/L) in the
hypolimnion (the bottom strata of a thermally stratified reservoir or lake). Typically, by
November, oxygenated water returns to the deeper portions of Lake Julian after lake turn over
(Progress Energy 2013). Historical DO concentrations were consistently greater than 4 mg/L
(minimum DO required by most healthy fish) in the epilimnion (Progress Energy 2013).
Mean specific conductance data were consistent across the data collection period, with values
between 94 micro Siemens per centimeter(pS/cm) in 2004 to 118 pS/cm in 2000 and 2007
(Table 2-1). The range of values documented for Lake Julian between 2000 and 2010 is
consistent with freshwater systems in the region (Progress Energy 2013).
The annual mean surface water temperatures recorded at Station D2 for the data period (2000,
2001, 2004, 2007, and 2010) exhibited minimal inter-annual variation, ranging between 25.4
degrees Celsius (°C) (2001) and 27.1°C (2000) (see Table 2-1). Upon commencement of ACC
operations, blow-down and other byproducts of the ACC units will be routed to an existing outfall
on the French Broad River and the thermal discharge into Lake Julian from the existing coal-
fired operations will be terminated. As a result, the annual average water temperatures in Lake
Julian are expected to return to ambient conditions more reflective of a small, mountain
watershed.
Changes in water temperatures have the potential to impact the occurrence and extent of
thermal stratification of Lake Julian during the summer months, which would also potentially
result in a slight improvement in DO conditions during the same time period. The absence of the
thermal inputs from the coal-fired operations would also improve fish habitat for the native fish
species in Lake Julian, as those species are well-adapted to the ambient water temperatures
that will occur under operation of the ACC.
2.3 Determination of Area of Influence
Reference to the area of influence (AOI) relative to a CWIS appears in three of the §122.21(r)
sections of the Rule6:
• §122.21(r)(2) Source Water Physical Data requires information on "the methods used to
conduct any physical studies to determine the intake's area of influence in the waterbody
and the results of such studies."
6 http://www.cipo.gov/fdsys/pkq/FR-2014-08-15/pdf/2014-12164.pdf
Duke Energy I 11

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
• §122.21(r)(4) Source Water Baseline Biological Characterization Data states: "The study •
area should include, at a minimum, the area of influence of the cooling water intake
structure."
• §122.21(r)(11) Benefits Valuation Study states: "The study would also include discussion
of recent mitigation efforts already completed and how these have affected fish
abundance and ecosystem viability in the intake structure's area of influence."
Although the Rule does not provide a definition of AOI, the §316(b) Phase I rule for new
facilities' states that:
"The area of influence is the portion of water subject to the forces of the intake structure
such that a particle within the area is likely to be pulled into the intake structure."
While neither a formal definition of the AOI nor guidance for its estimation is provided in the
Rule, it is assumed that the AOI is that area of the source waterbody from which organisms are
drawn into the intake and either entrained or impinged.
2.3.1 Methods — Desktop Calculation
For impingeable-sized organisms (i.e., generally juvenile and adult fish and shellfish), the AOI
can be defined as the region in which organisms are not capable of overcoming the influence of
water withdrawal and become impinged upon an intake screen (EPRI 2007). The Rule allows an
intake through-screen velocity (TSV) of 0.5 feet per second (fps)8 or less as a compliance option
for impingement reduction. This threshold is based on the assumption that, at velocities below
this value, healthy impingeable-sized fishes will be able to swim freely and avoid impingement.
Based on this assumption, a conservative definition of the AOl9 for impingement is the area
encompassed by the 0.5 fps velocity contour at the CWIS. At this boundary and beyond it, the
potential for impingement is approximately zero. Within the 0.5 fps boundary, the potential for
impingement increases with increasing proximity to the intake structure. However, because
juvenile and adult fish have varying swimming abilities and preferred habitats, including those
that involve velocities above 0.5 fps (Leonard and Orth 1988), fish within the area contained by
the 0.5 fps velocity threshold will not necessarily become impinged.
The threshold velocity for entrainment is reflected by the velocities (above ambient velocities)
created by the CWIS, such that plankton may be drawn into the intake structure rather than
transported away in the ambient flow. Wind-induced surface drift velocities are typically two to
three percent of the average wind speed (Wiegel 1964). At a location where the intake-induced
velocity is less than 0.1 fps to 0.3 fps, the ambient wind-induced currents will likely dominate the
flow patterns and the hydraulic influence of the intake structure will no longer be significant
(Golder Associates 2005).
66 FR 65318, December 18, 2001.
8 As per the Rule, the design TSV of less than 0.5 fps meets the impingement mortality reduction standard through
Compliance Alternative 2(§125.94(c)(2)).
9 This approach was proposed to Ohio EPA(OEPA)by Dayton Power&Light in their Proposal for Information Collection
for the Stuart Generating Station on the Ohio River. Their approach was accepted by OEPA and also recommended
as a model for other facilities on the Ohio River(EPRI 2007).
Duke Energy 112

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station ('
• These threshold values are consistent with those used in other AOI studies. For example, the
Electric Power Research Institute (EPRI) used threshold velocities of 0.1, 0.5, and 1.0 fps in
their desktop analysis presented in "Cooling Water Intake Structure Area-of-Influence
Evaluations for Ohio River Ecological Research Program Facilities" (EPRI 2007), and Golder
Associates (2005) used 0.1 and 0.3 fps in their desktop calculation of AOI for the Crystal River
Energy Complex in Florida.
The entrainment AOI is evaluated as the approximate area within the 0.3 or 0.1 fps velocity
contours in the vicinity of a CWIS. For an organism to become entrained, it must enter the
entrainment AOI of a CWIS. Physical and temporal factors that influence the entrainment AOI of
a CWIS include (EPRI 2004):
a) the speed, direction, and distribution of flow in the waters that surround the CWIS;
b) the bathymetry of the waters that surround the CWIS;
c) the intake flow rate and variability of flow to the intake; and
d) the design of the intake.
2.3.2 Results — Desktop Calculations
Cooling tower make-up water will be withdrawn at the existing Lake Julian CWIS which is
comprised of four identical intake bays. Each bay will be equipped with a submersible pump
with a design capacity of approximately 1,800 gallons per minute (gpm) (2.6 MGD). The ACC
consists of two units (Unit 05/06 and Unit 07/08) that are designed to operate with two pumps
• (one per unit), with the remaining two pumps providing redundant pumping capacity. As a result,
the combined DIF capacity for the new ACC units will be 3,600 gpm (5.2 MGD). The CWIS is
equipped with 1-inch hexagonal mesh fixed screens attached to the upstream face of the bar
racks and oriented perpendicular to the direction of flow. In addition, new '/4-inch mesh fixed
screens will be installed on the downstream side of the 1-inch hexagonal mesh panels as
additional protection for the new submersible pumps.
TSV calculations for were performed for both the existing 1-inch hexagonal mesh screens and
new 1/4-inch mesh screens under normal and low water surface elevations (2,160.0 feet and
2,158.0 feet, respectively). Inputs used to perform TSV calculations are provided in Table 2-2;
the TSV calculation package is provided in Appendix C.
The average TSV under existing conditions (1-inch hexagonal mesh screen) at design flows and
normal water surface elevation is 0.034 fps, and at low water surface elevation is 0.039 fps
(Table 2-2). The average TSV for the new 1/4-inch mesh screen panels at design flows and
normal water surface elevation is 0.043 fps, and at low water surface elevation is 0.049 fps
(Table 2-2). These calculated TSVs are considerably lower than the 0.5 fps threshold used as
the BTA standard for impingement mortality (§125.94(c)(2)). Impingement at the CWIS on Lake
Julian is negligible because the impingement AOI does not extend beyond the face of the
screen.
Duke Energy I 13

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
Table 2-2. Summary of Input Parameters for TSV Calculations of CWIS on Lake Julian •
Existing 1-inch Hexagonal New 1/4-inch Mesh Fixed
Mesh Fixed Screens* Screens
TSV Calculation Inputs
Unit 05/06 Unit 07/08 Unit 05/06 Unit 07/08
Number of screens 2 2 2 2
Elevation at bottom of intake(feet) 2,144 2,144 2,144 2,144
Normal water surface elevation(ft msl) 2,160 2,160 2,160 2,160
Low water surface elevation(ft msl) 2,158 2,158 2,158 2,158
Screen width(feet) 9 feet 2 inches 9 feet 2 inches 9 feet 2 inches 9 feet 2 inches
Mesh size(L)(inches) 1 1 0.25 0.25
Mesh size(W)(inches) 1 1 0.25 0.25
Mesh gauge number 19 19 16 16
Cooling Water Pump 1 Rating (gpm) 1,800 1,800 1,800 1,800
Cooling Water Pump 2 Rating(gpm) 1,800 1,800 1,800 1,800
TSV at normal water surface elevation 0.034 0.034 0.043 0.043
(fps)
TSV at low water surface elevation(fps) 0.039 0.039 0.049 0.049
*Represents the TSV inputs based on the existing screens at the CWIS on Lake Julian •
The calculated entrainment AOI, based on a 0.3 or 0.1 fps threshold velocity for the %-inch
mesh screens is also considered negligible because, under the operational conditions for the
ACC, the maximum TSV at design flows is 0.049 fps. At a TSV of 0.049 fps, the intake-induced
velocity would not exceed 0.1 fps and would not extend beyond the face of the screens. As
such, the AOI for entrainment at the CWIS on Lake Julian approximates zero.
In an evaluation of fish swimming speed versus body length relative to the 0.5 fps impingement
compliance alternative, the U.S. Environmental Protection Agency (EPA) concluded that a TSV
of 1.0 fps would protect 78 percent of tested fish, and a velocity standard of 0.5 fps would
protect 96 percent of tested fish (EPA 2014). Based on this information, a maximum TSV of
0.049 fps at ACC will likely protect greater than 96 percent of fish from impingement at the
CWIS on Lake Julian.
Duke Energy I 14

Clean Water Act§316(b)Compliance Submittal 1.01
Asheville Combined Cycle Station
3 Cooling Water Intake Structure Data
[§122.21 (r)(3)]
Cooling water for the ACC will be supplied though the existing CWIS on Lake Julian situated on
the southern shoreline of the western arm of Lake Julian (Figure 3-1).The following sections
provide additional information on the configuration and proposed operations of the CWIS on
Lake Julian.
,,
r
o .°* >.
lake Julian
re
Broad
River
Existing Units 1&2 CWIS
(ACC Unit 05/06&' 07/08)
River Intake
Structure Intake Cove
•
•
Ott,
Figure 3-1. Asheville Combined Cycle Cooling Water Intake Structure on Lake Julian,
Buncombe County, North Carolina
3. 1 Configuration
The approximately 60-foot-wide CWIS on Lake Julian was originally constructed in the early
1960s for the Asheville Plant and will be repurposed for the ACC. The CWIS is comprised of
four equally-sized intake bays (referred to as Intake Bays 1, 2, 3, and 4). A summary of the
existing CWIS major components and those that will be repurposed or replaced is provided in
Table 3-1. The general layout of the repurposed CWIS is shown in Figure 3-2. The opening of
each of the four intake bays is approximately 21 feet high by 9 feet, two inches wide with an
invert elevation of 2,144 ft msl (see drawing G-171048 in Appendix D). Each bay is equipped
with a bar rack, two sets of fixed mesh screen panels (1-inch and 1/4-inch), and a submersible
make-up cooling water pump.
Duke Energy I 15

Clean Water Act§316(b)Compliance Submittal FIN
Asheville Combined Cycle Station
Table 3-1. Existing and Repurposed Cooling Water Intake Structure Components •
Existing Intake Structure Repurposed Intake Structure
Description of Major CWIS Components ,
Unit 1 Unit 2 Unit 05/06 Unit 07/08
Number of intake bays 2 2 same same
21 feet high x 21 feet high x
Intake bay dimensions 9 feet, 2 9 feet,2 same same
inches wide inches wide
Elevation at bottom of intake(feet) 2,144 2,144 same same
1-inch hexagonal mesh fixed screen panel 2 2 same same
Bar racks 2 2 same same
'/4-inch mesh fixed screen panel -- -- 2 new 2 new
Once-through condenser cooling water
pump capacity(gpm) 2 x 48,300 2 x 61,500
Submersible make-up cooling water pump
capacity(gpm) -- -- 2 x 1,800* 2 x 1,800*
`Units 05/06 and 07/08 are designed to operate using one 1.800 gpm each. the remaining pump is for backup
Units 5 6 Units 7/8
Pump Pump Pump Pump
5A 58 7A 76
Y.-inch screen -a inch screen '/.-inch screen /.-inch screen
)
:::::.,..,,,,..._: :..
Bar Rack Bar Rack Bar Rack Bar Rack
1-inch hexagonal I-inch hexagonal 1-inch hexagonal 1 inch hexagonal
mesh screen mesh screen mesh screen mesh screen
Intake Bay 1 intake Bay 2 Intake Bay 3 Intake Bay 4
T T T T
Lake Julian
Figure 3-2. Layout of the Repurposed Lake Julian Cooling Water Intake Structure (not to
scale)
Duke Energy I 16

Clean Water Act§316(b)Compliance Submittal 01
Asheville Combined Cycle Station r
. Near the entrance of the CWIS, 1-inch hexagonal mesh screens (comprised of 19-gauge wire)
are overlain on the exterior side of the bar racks (3/8-inch thick steel bars with 3-inch on center
spacing) to help prevent large debris from entering the structure, as illustrated in Figure 3-3. The
new 1/4-inch mesh (16-gauge wire) fixed screen panels will be located approximately 16.5 feet
downstream of the bar racks in the slots formerly used for traveling screens (see drawing G-
171048 in Appendix D). The new screens will be on the upstream side of the new submersible
cooling water make-up pumps and provide an added layer of protection from debris that is able
to pass through the outer 1-inch hexagonal mesh screens and bar racks.
Wffinilialiffillilinfilir /111111111
ip-. 1.1111111111111111.11P.
4-11101014011110...
4111
s"
Q'0.+•
.dr'2:1-:3'
N.
IA; r Y� �
- � , r
Figure 3-3. Photograph of a 1-inch Hexagonal Mesh Screen Panel Employed at the
Cooling Water Intake Structure on Lake Julian
Each bay will be equipped with a submersible pump with a design capacity of approximately
1,800 gpm (2.6 MGD). Raw water will be withdrawn from Lake Julian, where it will pass through
the 1-inch hexagonal mesh screen panels, bar racks, and 1/4-inch mesh screen panels before
entering the submersible pumps. Design drawings for the Lake Julian CWIS are provided in
Appendix D.
3.2 Operation
The ACC facility is anticipated to operate as a base load facility with year-round condenser
cooling water operations. The ACC will operate by utilizing one 1,800 gpm (2.6 MGD) capacity
um per Unit (power block) for a total facilityDIF of 5.2 MGD. Raw water pump5A or 5B1°will
pump
supply raw water, including cooling water, to Unit 05/06 and raw water pump 7A or 7B will
supply raw water, including cooling water, to Unit 07/08 (Figure 3-2). Note only two pumps (one
for each power block) will be operational at any one time, with the remaining two pumps
providing redundant pumping capacity.
10 Each of the power blocks will be operated with cooling water supplied from one of the two pumps dedicated to the
power block. For example, with Units 05/06 only one of the two pumps(5A or 5B)will be actively pumping water at
any given time. The remaining pump serves as a redundant or back-up pump to maintain operations during
scheduled or unplanned repairs to the other pump.
Duke Energy 117

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
3.3 Latitude and Longitude of Structures
The latitude and longitude (in degrees, minutes, and seconds) of the CWIS on Lake Julian is
provided in Table 3-2.
Table 3-2. Cooling Water Intake Structure Coordinate Information
(Source: DEP 2005, DEP 2007)
Intake Latitude Longitude
Intake on Lake Julian 35°28'20.7"N 82°32'35.4"W
3.4 Engineering Drawings of CWIS
A list of design drawings for the CWIS on Lake Julian is provided in Table 3-3 and the drawings
are provided in Appendix D.
Table 3-3. List of Engineering Drawings for ACC Intakes
Structure Type Drawing No. Drawing Title
CWIS on Lake Julian As-built C-219-D Concrete Intake Structure
CWIS on Lake Julian Plan&Sections G-170903
Cooling Water System
(Unit 1 Intake) Intake-MAS SH NO 1
CWIS on Lake Julian Plan&Sections G-171048 Intake Steel&Screens
'/4 inch Mesh Fixed General Arrangement E117624 Static Screen
Screen Panel
Duke Energy 118

Clean Water Act§316(b)Compliance Submittal FYR
Asheville Combined Cycle Station
4 Source Water Baseline Biological
Characterization Data [§ 122.21 (r)(4)]
4. 1 Review of Available Biological Data
The biological data needed to prepare the information required under 40 Code of Federal
Regulations (CFR) §122.21(r)(4) are available. A list of historical data reviewed to develop the
baseline biological characterization of the source waterbody, Lake Julian, includes the following:
• 2015 and 2016 Lake Julian Electrofishing Study, unpublished data (DEP 2017b);
• 2010-2011 Environmental Monitoring Report (Progress Energy 2013);
• Electrofishing data presented from 2002, 2005, 2008, and 2010 sampling activities; and
• 2000 Environmental Monitoring Report (CP&L 2001), including electrofishing (1998 and
2000) and gillnet (2000 only) data.
These data were compiled and analyzed for this report and are summarized below. This report
was developed utilizing the existing, available data for Lake Julian. As the selected ACC
technology is fully compliant with the Rule, no impingement or entrainment studies were
performed in support of the development of this compliance documentation. No additional
• studies were performed to support the baseline biological characterization for the proposed
ACC.
4.2 Species and Relative Abundance near the CWIS
Since 1973, DEP has performed sampling of the fish community at multiple locations within
Lake Julian (Figure 4-1). The objectives of the Lake Julian Environmental Monitoring Program
(Program) are to assess the lake's overall water quality and the fishery community and
document the introductions and/or possible impacts of non-native or exotic species to the lake.
The following sections summarize the data collected from Lake Julian under the Program.
4.2.1 Lake Julian Environmental Monitoring Program
Under the Program, as described in Section 2, data are collected and used to characterize the
fish community in Lake Julian. Data from sampling activities performed on Lake Julian from
2000 through 2016 are summarized below.
Electrofishing Studies (Carolina Power and Light Company 2001, Progress
Energy 2013, and DEP 2017b)
DEP, previously Carolina Power & Light Company (CP&L), performed nighttime boat
electrofishing in October 2000 at 30 shoreline sampling locations in Lake Julian, representing 6
shoreline habitat types (CP&L 2001). These long-term sampling locations are shown on Figure
4-1.
Duke Energy 119

Clean Water Act§316(b)Compliance Submittal EN
Asheville Combined Cycle Station J
LEGEND . i - -
• Station Location / *V a
0 Sampling Locations a ix,,. J T
Habitat Type
Bare Shoreline iBS)
Developed Shoreime with
Bulkhead IDS)
Overhanging Vegetation(OV
Overhanging Vegetation w'
Downed Timber(OT) 0
C
_ Overhanging Vegetation w i - " �r
Raprap(OR) i
r;
Riprap Embankment(RR) , ''
()ATA SOtURCE'.Lv.tic.-•_r9t99.949,,ortne..9rt•.and t,n
J
- (D i. ..
7
Pt
e' )2400
co�.w < £:: C'
. i s Cly
C) crr-7 ,c E 1
��+
f
r'+`u
Lake Julian ,
Station 30 0
IBSI "
' Station 29 Q _ ,
0 IRRI �jr'^.M,� t5� 7J
1c, (a.1)
.:1;'^'Station 27 " '
RRi
• k Station 22 ,_
Stabon23 (BSp""'�• "' ,2
(RRI •,,L,.5 ^U•• Slat ori. ••t .
SLitio i 16 r.s' Station 24 .1r • �Rk
iBSI ati 'DS)* t •i • ,A
Stati 25 < ,
glikiiik. -:,°wr: w (RR( 1 i'..
4
OM
Mari Two Swarm V�0~�1 Penne
YT ICY
._,., ..
�r''' ..- Ram Mn+hr¢5: 927 /041q 1919
099•1e0•e sPonie•CS 1 a.10 710 a 13
+!. y ' / % \ 9N-Fta=”i3OVa 1 L K /0121 as
\\ V.!'.99.g VeRUMbn.T 9999.tn•w or, 7 st s4 1.11r 0 a.S
0.9999•99.9 9•9999999.w.p99..019, n.N Ise• d r
1„Nevili cin•. ", al yIOQi _ *•<^ H V' 1.11 27 ORS 110
TRIM UP*Mine ht11.1•f M.K LISSA 71•
Cyte Statiop� 0".i^`,• TOW••...r. 7 34E w!
Figure 4-1. Shoreline Habitat Types and Locations Sampled with Nighttime Electrofishing
in Lake Julian, 2000-2016 (CP&L 2001, Progress Energy 2013, DEP 2017b)
The entire length of the shoreline for each sampling location was sampled and catch rates were
adjusted to number per hour of sampling time. Since 2002, triennial sampling has been •
performed, consisting of spring (March) and fall (October) sampling at 16 shoreline locations in
Lake Julian representing the same 6 shoreline habitat types (Progress Energy 2013). .
Unpublished data from additional electrofishing studies performed in 2015 and 2016 (DEP
2017b), and using the program methodology described here, were also reviewed and included
below.
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Relative abundance for the species collected during electrofishing of Lake Julian in the more
recent years (2000, 2010, 2015, and 2016) is summarized in Table 4-1. Species composition in
Lake Julian has remained fairly consistent, varying between 12 species in 2000 and 16 species
in 2010. Mean catch rates based on historical electrofishing data (2002, 2005, 2008, 2010,
2011) indicated that game fish species such as Bluegill (Lepomis macrochirus), Redear Sunfish
(Lepomis microlophus), Redbreast Sunfish (Lepomis auratus), Largemouth Bass (Micropterus
salmoides), and Channel Catfish (Ictalurus furcatus)were the dominant species (80 percent)
across all habitat types for Lake Julian (Progress Energy 2013). Threadfin Shad (Dorosoma
petenense) were also consistently collected in electrofishing efforts on Lake Julian.
Table 4-1. Relative Abundance of Fish Collected in Electrofishing Samples on Lake
Julian, 2000, 2010, 2015, 2016 (CP&L 2001 and Progress Energy 2013, DEP 2017b)
Relative Abundance(Percent)
Scientific Name Common Namea
2000b 2010° 2015° 20168
Lepomis macrochirus Bluegill(R) 68.7 64.2 39.2 45.7
Lepomis spp. Hybrid Sunfish(R) 0.4 19.0 11.4 16.4
Lepomis auratus Redbreast Sunfish(R) 11.7 2.1 2.4 4.4
Lepomis cyanellus Green Sunfish(R) 9.1 4.7 17.4 13.1
Lepomis gulosus Warmouth(R) 1.3 0.1 1.7 0.4
Lepomis microlophus Redear Sunfish(R) 0.2 2.7 5.7 5.4
Micropterus salmoides Largemouth Bass(R) 4.7 0.9 3.2 3.9
Micropterus punctulatus Spotted Bass(R) -- 0.4 6.4 4.8
Micropterus sp. Largemouth Bass x Spotted Bass Hybrid(R) -- -- -- 0.03
Pomoxis nigromaculatus Black Crappie(R) -- 0.5 0.04 -
lctalurus punctatus Channel Catfish(R) 2.6 1.3 2.2 2.1
Ameiurus platycephalus Flat Bullhead(R) -- <0.1 -- --
Dorosoma petenense Threadfin Shad(F) 0.4 1.4 7.7 3.0
Dorosoma cepedianum Gizzard Shad(F) -- <0.1 -- 0.03
Tilapia aurea Blue Tilapia(E) 0.6 2.5 2.5 0.7
Pterygoplichthys pardalis Amazon Sailfin Catfish(E) 0.2 <0.1 0.1 --
Cyprinus carpio Common Carp(R) 0.2 -- -- --
Ctenopharyngodon idella Grass Carp(S) -- -- - 0.02
Gambusia holbrooki Eastern Mosquitofish(F) -- <0.1 -- --
- Carassius auratus Goldfish(F) -- -- 0.02 --
a) R: Recreational; F: Forage; E: Exotic, non-native; S: Stocked
b) Relative abundance calculated from catch per unit effort(CPUE)
• c) Relative abundance calculated from total number collected (not standardized on effort)
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Annual stock indices (e.g., proportional size distributions) were compiled from sample results
from 2002, 2005, 2008, and 2010, and were used to evaluate the Largemouth Bass population
in Lake Julian. The proportional size distribution for Largemouth Bass for all sample years and
over the entire data range was indicative of a balanced bass management strategy (Progress
Energy 2013).
2000 Gillnet Study (CP&L 2001)
In October 2000, two experimental monofilament gillnets were fished targeting additional data
on species that were collected in low numbers or otherwise poorly represented in electrofishing
studies but consistently reported by anglers, primarily Black Crappie (CP&L 2001). Gillnets were
30.5-m long and 2.4-m deep with equal sections of 25-, 50-, 75-, and 100-millimeter stretch-
mesh monofilament. Nets were set for two days and fished at approximately 24-hour intervals.
Catch rates are expressed as mean number of fish per 24-hour set (Table 4-2). A total of seven
fish species were collected during gillnet sampling of Lake Julian in 2000. The dominant species
collected was Channel Catfish, followed by Threadfin Shad, and Blue Tilapia (Tilapia aurea).
Table 4-2. Mean Number per 24-Hour Set of Fish Collected during Gillnet Sampling on
Lake Julian, 2000 (Source: CP&L 2001)
Family Name Scientific Name Common Name Mean(per 24-hour set)
Ictaluridae Ictalurus punctatus Channel Catfish 17 •
Clupeidae Dorosoma petenense Threadfin Shad 10
Cichlidae Tilapia aurea Blue Tilapia 7
Micropterus salmoides Largemouth Bass 4
Lepomis macrochirus Bluegill 3
Centrarchidae
Lepomis microlophus Redear Sunfish 1
Pomoxis nigromaculatus Black Crappie <1
Total Number of Species 7
4.2.2 Conclusions from Lake Julian Sampling Program
Long-term fish community monitoring results indicate the fish community is not dominated by
pollution-tolerant species, but rather by native sunfish (centrarchids) and other recreational
species from multiple size classes indicating a self-sustaining biological community with the
capacity to sustain themselves through cyclic seasonal changes (Progress Energy 2013). Two
exotic (non-native) species were also documented in Lake Julian, (i.e., Blue Tilapia and Amazon
Sailfin Catfish [Pterygoplichthys pardalis]). The Amazon Sailfin Catfish was first documented
during 1997 and was most recently collected in 2015, although relative abundance was low at
0.1 percent (Progress Energy 2017b). In 1965, Blue Tilapia were experimentally stocked by the
North Carolina Wildlife Resources Commission to provide additional forage for Largemouth
Bass. Blue Tilapia subsequently became established in Lake Julian; however, results from
periodic electrofishing studies consistently indicate low relative abundance (varying between 0.6
to 2.5 percent from study data collected between 2000 and 2016).
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Potential changes associated with operation of the ACC facility (i.e., elimination of the thermal
plume in Lake Julian) is not expected to result in an adverse environmental impact to the native
aquatic organisms in Lake Julian because they are naturally adapted to the ambient conditions
of Lake Julian (a small, mountain lake). However, populations of the exotic Blue Tilapia and
Amazon Sailfin Catfish are expected to be reduced or eliminated from Lake Julian with the
removal of the thermal inputs from the retiring fossil station. Threadfin Shad is a fragile species
that typically experiences varying levels of winter mortality in response to cold shock. As such,
the removal of thermal inputs from the retiring fossil station may result in winter mortalities or
potentially lead to the elimination of this species in Lake Julian.
4.3 Primary Growth Period
Fish are cold blooded, thus primary growth occurs when water temperatures are 10°C or above.
The conventional view on seasonal variation in fish growth in North America is that growth is
fastest in the spring and early summer, slows in the late summer and fall, and virtually stops in
the winter (Gebhart and Summerfelt 1978). The majority of fishes will have their highest
densities shortly after the hatch occurs when larvae are concentrated and natural mortality has
not yet reduced numbers. Feeding competition is especially important during late spring through
early summer when the bulk of fish are in their early life stages and are more susceptible to
starvation (May 1974). This is a critical stage in development, where larval fish have a short
time period to initiate exogenous feeding before starving (Ehrlich 1974; Miller et al. 1988).
Fish reproduction for the species in Lake Julian occurs via external fertilization", which is
principally controlled by water temperatures. Fish reproduction has the potential to produce high
yields; however, mortality rates can also be high compared to other organisms. Additionally, a
majority of fish spawn only once a year regardless of prior success. Fecundity, the number of
eggs a female produces, can vary depending on the life history of the species. Species-specific
spawning information is summarized in Section 4.4 of this report (Seasonal and Daily Activities
of Organisms in the Vicinity of the CWIS). Monitoring data collected on Lake Julian indicate the
presence of multiple size classes indicating good reproductive success.
Generally, larval recruitment to the juvenile life stage in North Carolina begins in November and
continues until April or May, depending on the life history strategy of individual species (Page
and Burr 2011). As a result, peak larval fish entrainment also commonly occurs during the
period immediately prior to larval recruitment to the juvenile or young-of-year stage. During this
period, the smaller larval stage fish are less adept at maintaining their position in currents
compared to larger fish and are more susceptible to entrainment.
The majority of the native fish species present in Lake Julian are nest builders; the eggs remain
in the nest and newly hatched larvae do not travel far from the nest. Others are broadcast
spawners with demersal and adhesive eggs that stick to the substrate.
11 The release of both sperm and egg outside of an organism is defined as external fertilization.
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4.3.1 Period of Peak Abundance for Relevant Taxa •
Fish spawning is a direct function of water temperature, and most activity is constrained to the
spring and early summer months. As a result, an influx of egg, larval, and juvenile fishes occurs
in Lake Julian each year when water temperatures begin to rise. Under ACC operations,
spawning is anticipated to initiate around March or April. As such, peak abundance for most
early life stages and juvenile fishes in Lake Julian is expected to occur between April and June
depending on each species' unique spawning habitats, as presented in Table 4-3.
Table 4-3. Known Spawning and Recruitment Period of Native Species with Documented
Occurrence in Lake Julian, North Carolina (Sources: Rohde et al. 1994; Rohde et al. 2009;
Etnier and Starnes 1993 )
Common Namecji Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Black Crappie ---
Bluegill I __-
Green Sunfish I 111_--
Largemouth ■�
Bass
Largemouth X
Spotted Bass
Centrarchidae Hybrid
Redbreast I ■_
Sunfish
Redear Sunfish ---
Bmallmouth ■■■
Bass
Spotted Bass --�
Warmouth I
Clupeidae Gizzard Shad -_-
Threadfin Shad ■■-
Common Carp -_--
Cyprinidae Goldfish ----
Grass Carp 1111
._.
Brown Bullhead I
Ictaluridae Channel Catfish I
Flat BullheadEI -
tern
Poeciliidae
Mosquitofish ■-
tofish
Gray-shaded months indicate the known spawning Darker shaded months
and recruitment period. indicates period of potential
peak abundance.
Note: The data presented here represent the spawning and recruitment windows that are typical of the region and
that are anticipated for Lake Julian after operations of ACC begin.
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4.4 Seasonal and Daily Activities of Organisms in the
Vicinity of the CWIS
There are no diadromous fish species in Lake Julian. Most species undergo short or local
migrations for spawning and/or overwintering. Table 4-4 summarizes seasonal (i.e., spawning)
and daily (i.e., feeding and habitat preference) activities for species observed in Lake Julian.
Table 4-4. Seasonal and Daily Activities of Species Present in Lake Julian (Sources:
Rohde et al. 2009; Rohde et al. 1994; Etnier and Starnes 1993)
Species
(Common Seasonal Activities/Spawning Migration Daily Activities/Daily Migration/Habitat
Name)
Usually found in vegetated areas of backwaters in
Spawning occurs from late February to early streams and rivers in ponds and reservoirs.Prefer
Black Crappie May.Nests are constructed in shallow water clearer and cooler waters than White Crappie.Young
sometimes in close proximity to each other. Black Crappie feed on aquatic insects and small fishes
and adults feed primarily on fishes.
Spawning occurs from May through the end of Tolerant of many conditions,and utilize most of the
summer(typically August)with a peak generally habitats available to the species in North Carolina.
•
Bluegill in June.Colonies of nests are constructed by Natural habitats are pools in creeks and rivers,swamps,
males in shallow water areas on variable oxbow lakes,impoundments,and ponds,with cover of
substrates. vegetation,submerged wood,or rocks.Their diet
consists of aquatic insects,small fishes,and crayfishes.
Prefer slow pools and backwaters of low-and moderate
Spawning occurs from April through August. gradient streams and rivers,but also occur in ponds,
Green Sunfish Colonies of nests are almost always constructed lakes,and reservoirs.Highly tolerant of conditions such
near shelter such as a log or clump of as turbidity and drought and can rapidly colonize new
vegetation. habitats. Food preferences are aquatic insects and
small fishes.
Spawning occurs late April to June.Nests are Occupy a wide variety of habitats.Prefer warm,calm,
Largemouth Bass generally located in sand or gravel at the base of and clear water and thrive in slow streams,farm ponds,
logs,stumps,and emergent vegetation along lakes,and reservoirs.Adults feed on fishes,frogs,and
shorelines. almost any other animal of appropriate size.
Spawning generally occurs from late May Typically found in pools and backwaters of streams and
Redbreast through the end of July,with a peak in June. rivers of low to moderate gradient where the species is
Sunfish Nests are larger saucer-shaped depressions usually associated with woody debris,stumps,and
swept out in a substrate of coarse sand and undercut banks. Preferred foods include terrestrial
gravel and typically made in shallow water. insects,aquatic insects,small clams and fishes.
Found in a variety of habitats in ponds,lakes,reservoirs,
Spawning generally occurs from late spring to swamps,sluggish streams,small rivers,and backwaters
Redear Sunfish early summer. Nests are constructed in colonies often in or near vegetation and over a mud or sand
in shallow waters. bottom.Prefer to feed on hard invertebrates such as
snails and small clams.
Spawning occurs from late spring to early Prefer clear water but occasionally can be found in
Smallmouth Bass summer.Nests are constructed in coarse gravel either cool or warm waters of mountain rivers and deep
in less than three feet of water near the margins rivers.Young feed on insects while adults feed primarily
of streams or lakes. on crayfishes and fishes.
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Species
(Common Seasonal Activities/Spawning Migration Daily Activities/Daily Migration/Habitat
Name)
Spotted Bass spawn between mid-April and mid- Preferred habitat is long deep pools in medium to large
June.The males construct nests over rocky or streams and rivers.They avoid shallow,heavily
Spotted Bass gravely substrate near cover.They will spawn in vegetated,still,waters preferred by Largemouth Bass,
deeper water than the other two species of Black and the swift flowing rocky waters preferred by
Bass. Smallmouth Bass.Young feed on insects while adults
feed primarily on crayfishes and fishes.
! ± tEt
pawning ours from late spring thrWarmouth and reservoirsepecially in shallow and well vegetated
llow water. areas.They eat only crayfishes and insects.
Cichiidae
Blue Tilapia Young develop inside of female Nest builders
Inhabit lakes,ponds,pools,and backwaters of low-
Spawning occurs in the spring and summer,from gradient streams.Gizzard Shad are filter feeders,
Gizzard Shad March through August,usually near the surface consuming copepods,cladocerans,phytoplankton and
and in large aggregations. zooplankton.Feeding activity is highest during the day
with minimal activity at night.
Spawning occurs from April to July,during the -
Threadfin Shad brief interval between dawn and sunrise,near Occur in large schools in mid-water and feed on
the shoreline,and over aquatic plants and other phytoplankton and zooplankton.
submerged objects.
Cyprinid`
Tolerant of a wide range of environmental conditions.
Typically found in the calm and mud-bottomed waters of
sluggish pools,backwaters,and reservoirs where
Spawning occurs in the spring in shallow,warm, vegetation is present.Common Carp are omnivores.
Common Carp and vegetated waters.The small eggs attach to They ingest mouthfuls of the soft bottom sediments
vegetation or sink into the muddy substrate. (detritus),expels them into the water,and then feed on
the disclosed insects,crustaceans,annelid worms,
mollusks,weed and tree seeds,aquatic plants,and
algae.
This benthic species is commonly found in still water of
Goldfish Spawning occurs in the spring and summer. lakes,reservoirs,ponds,rivers,and quite streams
Adhesive eggs are scattered. dominated by vegetation.It tolerant clear or turbid
waters.
During spawning season,Grass Carp will Found in quiet or slow-moving waters,in ponds,lakes,
Grass Carp migrate up rivers.They typically lay eggs over pools,and backwaters of larger rivers.Young are known
shoals and a large female can produce more to eat small invertebrates and microcrustaceans while
than a million eggs. adults are omnivorous.
Ictaluridae
Occur over soft substrates in pools,slow-moving creeks,
Spawning begins in April and May and continues and any-sized rivers and in various lentic habitats.They
Brown Bullhead into late summer;adults build circular,shallow are bottom feeders with a wide variety of diet consisting
nests. of crustaceans,insects,worms,algae,mollusks,and
fishes.
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Species
(Common Seasonal Activities/Spawning Migration Daily Activities/Daily Migration/Habitat
Name)
Inhabit a wide range of habitats from small to large
creeks,rivers,reservoirs,and ponds.The species can
Channel Catfish Spawning begins in April and May and continues occur over a range of substrates.The young feed on
into early summer. plankton and aquatic insect larvae while juveniles and
adults prefer crayfishes,mollusks,immature mayflies,
and caddisflies.
Occupy a variety of habitats.Adults are more common
Spawning occurs in June and July,at water in slow areas of rivers with a mud or sand bottom and
Flat Bullhead organic debris.The young frequently inhabit smaller,
temperatures of 21-24°C. clearer streams.Prefer aquatic insects,small fishes,
and snails.
Amazon Sailfin Introduced species that excavates river banks to
Catfish create burrows in which an attracted female will Feeds on algae,benthic organisms,and detritus.
lay and guard her eggs.
3,'"rs S a ki.
Primarily inhabit slow-moving,larger creeks,and rivers.
Eastern Spawning occurs in the spring when large
Generally found in pools and backwaters,often over a
Mosquitofish schools migrate to reproduce in calm sand bottom.Mainly feed on surface-dwelling aquatic
backwaters. insects and their larvae.
Water column migration or diel vertical migration in Lake Julian is typical for fish species that
inhabit lacustrine environments. During a daily cycle, zooplankton and fish exhibit synchronized
movements up and down in the water column and this movement is referred to as diel vertical
migration (Brierley 2014). Diel vertical migration in freshwater fish is primarily triggered by the
diel change in light intensity, with declining illumination at dusk triggering the ascent to the
surface and increasing illumination at dawn triggering the descent back to deeper water
(Mehner 2012). This is the typical pattern for many species; however, reverse migration can
also occur. Additional triggers for vertical migration include hydrostatic pressure and water
temperature, which may guide fish into particular water layers at night (Mehner 2012). Pelagic
(open water) organisms use diel vertical migration to balance the competing objectives of
growing quickly and minimizing predation risk. In fish species that perform diel vertical
migration, there are two similar ecological traits: 1) they are planktivorous; and 2) they require
cold or cool water and live primarily in the pelagic zone of deep, thermally stratified lakes
(Mehner 2012). In Lake Julian, diel vertical migration can be considered characteristic of many
freshwater fish species, particularly juveniles or species that are small in adulthood.
4.5 Species and Life Stages Susceptible to Impingement
and Entrainment
•
4.5.1 Impingement
The degree of vulnerability to impingement exhibited by adult and juvenile fish species depends
upon biological and behavioral factors including seasonal fish community structure, spawning
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effects on distribution, habitat surrounding intake structures, high flow'events, and attraction to
the flow associated with the intake. In addition, swimming speed, intake velocity, screen mesh
size, trash rack spacing, and other intake configurations will also affect the susceptibility to
impingement. For example, clupeids have high susceptibility to impingement based on multiple
factors such as schooling behavior, distribution in the water column, negative rheotactic
response to intake flows, and poor swimming performance in winter months due to lower water
temperatures (Loar et al 1978).
No ongoing or historical impingement studies have been performed at the CWIS on Lake Julian.
The ACC makeup cooling water will be withdrawn from Lake Julian through fixed mesh screen
panels with a TSV of much less than 0.5 fps; thus, the ACC closed-cycle cooling system design
is fully compliant with Compliance Alternative 2 (§125.94(c)(2)). As such, no species or life
stages are anticipated to be susceptible to impingement at the Lake Julian CWIS. In addition,
the ACC's closed-cycle recirculating cooling water system (CCRS) is compliant with
§125.94(e)(1).
4.5.2 Entrainment
Ichthyoplankton, which is defined as the egg and larval life stage of fishes, exhibit the highest
degree of susceptibility to entrainment based on body size and swimming ability. Therefore, an
organism will spend only a portion of its life cycle susceptible to entrainment, as larger juvenile
and adult life stages are excluded by screens at the CWIS. Life history characteristics can
influence the vulnerability of a fish species to entrainment. For example, broadcast spawners
have free-floating eggs which drift with water currents and can be entrained in a CWIS;
however, species with adhesive eggs or nest building species will be less susceptible to
entrainment of early life stages.
DEP has regularly performed electrofishing surveys in Lake Julian near the CWIS. Historical
electrofishing sampling results for Lake Julian were used to determine species composition of
Lake Julian and to identify those species potentially susceptible to entrainment at the CWIS on
Lake Julian. The evaluation of species-specific susceptibility to entrainment is presented in
Table 4-5.
Based on the anticipated make-up water withdrawal volumes that will be required for operation
of the ACC, and the calculated TSV values presented in Section 3, interactions with aquatic
organisms are expected to be limited, with an extremely low potential for adverse environmental
impacts.
Two species in Lake Julian are considered "likely to be" susceptible to entrainment, Gizzard and
Threadfin Shad (Table 4-5) are broadcast spawners with high fecundity. While there is some
potential for species in Lake Julian to be susceptible to entrainment, the low TSV and low make-
up water withdrawal rate at this facility are expected to minimize entrainment and related
potential for adverse impacts to the biological community.
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Table 4-5. Entrainment Potential for Fish Species Identified in Lake Julian
Species Habitat Use/Preference Potential for Entrainment*
(Common Name)
Centrarchidae
Construct nests around vegetation Unlikely due to water depth in the vicinity of the
Black Crappie close to other nests CWIS, demersal and adhesive eggs, parental
care of nest until larvae swim-up
Nest generally constructed in Unlikely due to water depth in the vicinity of the
Bluegill shallow waters CWIS, demersal and adhesive eggs, parental
care of nest until larvae swim-up
Green Sunfish Construct nests around vegetation Unlikely; limited quantity of vegetation
available in the vicinity of the CWIS
Largemouth Bass Nest constructed in shallow areas Unlikely due to water depth in the vicinity of the
of one to six feet CWIS
Construct nests over silt-free or
Redbreast Sunfish lightly silted sand and gravel in Unlikely;specific substrate type not present
cover
Nest generally constructed in Unlikely due to water depth in the vicinity of the
Redear Sunfish shallow waters CWIS,demersal and adhesive eggs, parental
• care of nest until larvae swim-up
Unlikely due to water depth in the vicinity of the
Spotted Bass Nest builder CWIS, demersal and adhesive eggs, parental
care of nest until larvae swim-up
Warmouth Construct nests in cover Unlikely; no cover near intake
,...,,., ........ .- ..-... ,��., .�-'.,._a.r .�
Cichlidae
Blue Tilapia Nest builders and young develop Unlikely due to habitat preference and
inside of female reproduction tendency
Clupeidae
Gizzard Shad Broadcast spawners Potential, broadcast spawner increases
susceptibility
Threadfin Shad Broadcast spawners Potential, broadcast spawner increases
susceptibility
Cyprinidae
,,.m. r,..�,r ..n,... mnm<rn� .rrw„w<w. .:,m,.0 • ,
Common Carp Lays adhesive eggs in shallow Unlikely due to absence of shallow, vegetated
vegetation habitat in the vicinity of the CWIS
Goldfish Lays adhesive eggs in shallow Unlikely due to absence of shallow, vegetated
vegetation, introduced species habitat in the vicinity of the CWIS
Demersal eggs, stocked
Grass Carp populations are triploid and sterile. Unlikely; stocked species are triploid and
Illegal to stock this species unless sterile
triploid
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Species Habitat Use/Preference Potential for Entrainment*
(Common Name)
Brown Bullhead Females lay eggs in dark shallow Unlikely due to habitat preference •
areas under rocks and inside logs
Cavity nesters, found in large open
Channel Catfish areas with woody debris, bank Unlikely due to habitat preference
cavities; moderate currents
Flat Bullhead Cavity nesters Unlikely due to habitat preference
Amazon Sailfin Lay eggs in burrows and guard
Catfish eggs Unlikely due to habitat preference
Eastern Young develop inside female Unlikely because they are live-breeders
Mosquitofish
*TSV below 0.5 fps at the CWIS will minimize potential for entrainment for all species based on their ability
for avoidance of the intake. Species with floating eggs would continue to have some susceptibility to
entrainment.
The retirement of the Asheville Plant and commissioning of the new ACC will reduce the
potential for entrainment on Lake Julian and will result in a reduction of total withdrawal volumes
at the intake structure. The change from once-through cooling to closed-cycle cooling will
therefore have a positive impact on the health of the native fishery and reduce the potential for
entrainment on Lake Julian.
4.5.3 Life History Information for Species Susceptible to Entrainment
A subset of species present in Lake Julian with the likelihood to be entrained was selected for
detailed life history descriptions including reproduction, recruitment, and peak abundance.
Threadfin Shad and Gizzard Shad were selected as target species because of reproduction
(i.e., broadcast spawner or floating eggs). Bluegill was also selected as a target species
because it was the most abundant species in historical electrofishing collections, is a substantial
contributor to the recreational fishery, and is an important forage species for game fish. Other
selected species that contribute to the recreational fishery of Lake Julian and were among the
most dominant species collected in historical electrofishing sampling include Green Sunfish,
Largemouth Bass, and Spotted Bass.
Of the selected species, two (i.e., Threadfin Shad and Gizzard Shad) are recognized as having
the highest potential for entrainment at the CWIS.
Threadfin Shad
Spawning occurs in shallow waters such as near shorelines or riverbanks. Threadfin Shad
spawn from April to July in water temperatures above 16°C between dawn and sunrise. •
Spawning occurs near the shoreline and over aquatic plants and other submerged objects with
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eggs that are demersal and adhesive. Threadfin Shad are sensitive to sudden changes in water
temperature and oxygen content resulting in frequent die-offs in late summer and winter .
Gizzard Shad
Gizzard Shad spawning can occur from mid-March to late August, with peak population
spawning in May and June at water temperatures ranging from 15.6-22.8°C (Wallus et al. 1990).
They spawn in large schools and their adhesive eggs are deposited on roots, fibers, and debris
along the shore (Miller 1960). Gizzard Shad are extremely prolific spawners and can deposit as
many as 400,000 eggs at one time (Tomelleri and Eberle 1990).
Bluegill
Bluegill occur in most rivers and lakes in the southeastern U.S. and are frequently found in
backwater habitats containing vegetation and woody debris. Bluegill spawn at water
temperatures between 19.4 and 26.7°C (Cornish and Welke 2004; Spotte 2007). The spawning
season begins in spring or early summer when the water temperature reaches approximately
21.1°C with the peak of spawning in the mid-Atlantic region occurring in May or June. Individual
fish may spawn several times within the same season (Rohde et al. 1994).
Bluegill are colonial breeders in the sense that spawning fish build nests that are usually in
close proximity to each other. Males construct nests that are approximately 1 foot in diameter in
shallow water (i.e., depths of 1 to 3 feet). The eggs from several females can be fertilized and
deposited in the nest, which is then defended by the male until the eggs have hatched. Because
the nests are located in shallow depths, water level fluctuations can severely impact successful
reproduction as nests can be stranded by low water level or disrupted by strong wave action.
The adhesive eggs hatch after 72 hours at 22.2°C and 34 hours at 26.7°C (Cornish and Welke
2004). The yolk sac is absorbed when larvae are 6 millimeters long, at which time they leave the
nest and move into littoral vegetation. Fry are free swimming after approximately 10 days
(Carlander 1977). Fecundity ranges from 2,000 to 8,000 eggs at age 3 and up to 60,000 eggs at
ages 4 to 8.
Green Sunfish
Green Sunfish have a wide tolerance to many different aquatic conditions. They prefer smaller,
low-velocity streams and ponds but can inhabit lakes with weedy shorelines and shallow rivers.
Green Sunfish are tolerant to both turbid and clear water(Etnier and Starnes 1993). Green
Sunfish have an extended spawning period from June to August during which time a single
male will construct several nests (Hunter 1963). Green Sunfish are prolific colonizers and are
tolerant of warm, turbid water making them the most abundant and adaptable of all the
sunfishes. Spawning occurs when the water temperature rises above 21°C. Bluegill and Green
Sunfish have similar fecundity rates and produce approximately up to 50,000 eggs. Eggs hatch
after 1 to 2 days and generally stay with the male for 5 to 7 days for protection before the fry
become independent.
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Largemouth Bass
Largemouth Bass spawn when water temperatures reach 15.6-23.9 °C (Heidinger 1975). The
male builds a nest in substrate typically comprised of rocky sand or gravel and cleared of •
organic debris and silt (Emig 1966; Rohde et al. 1994; Pflieger 1997). The nests are 2 two 3 feet
in diameter and usually widely spaced (i.e., 30 feet apart) unless the available nesting area is
limited. Nests are built in areas of no current or wave action (Pflieger 1997) at depths of 1 to 15
feet.
Males remain at the nest to fan the eggs to keep them silt-free and to protect the young for up to
two weeks (Pflieger 1997). Eggs hatch in 2 to 5 days (Emig 1966) and the fry form tight schools
over the nest and begin to feed in five to eight days. The schools break up approximately 1
month after hatching when the young bass are approximately one inch long. Growth rates are
variable and depend on the lake productivity and food availability. Largemouth Bass typically
mature at about ages 1 to 2 in the region (Carlander 1977; Rohde et al. 1994), or when they
reach approximately 10 inches long (Pitlo et al. 2004).
Spotted Bass
The natural range of the Spotted Bass includes western North Carolina and western Virginia.
Similar to the Smallmouth Bass (Micropterus dolomieu), it spawns in late spring or early
summer (Rohde et al. 1994). The Spotted Bass constructs a solitary, saucer-shaped nest which
the male guards until the eggs hatch and the fry are capable of leaving the nest. Generally,
growth is faster in reservoirs than in flowing water (Rohde et al. 2009). The species is not long- •
living, with individuals typically not living past 6 years of age; maturity is reached at 2 to 3 years
of age.
4.6 Threatened, Endangered, and Other Protected
Species Susceptible to Impingement and Entrainment
at the CWIS
The Rule requires the permittee to document the presence of federally listed species and
designated critical habitat in the action area (see 40 CFR 125.98[f]). For the purpose of defining
listed species, the action area is defined as Lake Julian.
A desktop review of available resources was performed to develop a list of species with
protected, endangered, or threatened status that might be susceptible to impingement and
entrainment at the CWIS on Lake Julian. The USFWS's map-based search tool (Information for
Planning and Consultation [IPAC])was used to identify state or federally listed rare, threatened,
or endangered (RTE) aquatic species or critical habitat designations within Lake Julian. The
North Carolina Natural Heritage Program was consulted for state-protected species. Because
the ACC will be located in a freshwater environment, marine and anadromous federally listed
species and designated critical habitat under National Marine Fisheries Service jurisdiction were
not considered.
State or federally listed RTE aquatic species or critical habitat designations for Buncombe
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County, North Carolina, are provided in Table 4-6. Federal species of concern and candidate
species were omitted from the list (unless they were also state threatened or endangered), as
there are no requirements to address those species under the Rule or Section 7 of the
Endangered Species Act.
Table 4-6. Rare, Threatened, or Endangered (RTE) Aquatic Species Listed for Buncombe
County, North Carolina, and Record of Occurrence or Potential to Occur in Lake Julian
Scientific Common Status* Record of occurrences or potential to occur in Lake Julian
Name Name
Polyodon FSC, No record of occurrence in Lake Julian.
s athula Paddlefish SE Very low-believed extirpated from the region, never collected in
P electrofishing samples taken near the CWIS
Erimonax Spotfin No record of occurrence in Lake Julian.
monachus Chub FT, ST Very low-believed extirpated from the region, never collected in
electrofishing samples taken near the CWIS
Percina Blotchside FSC, No record of occurrence in Lake Julian.
burtoni Logperch SE Very low-believed extirpated from the region, never collected in
electrofishing samples taken near the CWIS
No record of occurrence in Lake Julian.
Very low—occurs in lotic habitat(riverine), never documented in
Alasmidonta Appalachian FE, SE Lake Julian and host fish not documented in Lake Julian; not
raveneliana Elktoe collected in recent survey of French Broad River(Alderman 201512,
NatureServe 2017)
No record of occurrence in Lake Julian.
Epioblasma Tan Very low—occurs in lotic habitat(riverine), never documented in
florentina Riffleshell FE Lake Julian and host fish not documented in Lake Julian; not
walkeri collected in recent survey of French Broad River(Alderman 2015,
NatureServe 2017)
No record of occurrence in Lake Julian.
Alasmidonta Slippershell FSC, Very low—occurs in lotic habitat(riverine), never documented in
viridis Mussel SE Lake Julian and host fish not documented in Lake Julian; not
collected in recent survey of French Broad River(Alderman 2015,
NatureServe 2017)
No record of occurrence in Lake Julian.
Very low—occurs in lotic habitat(riverine), never documented in
Lake Julian; not collected in recent survey of French Broad River
Strophitus Cree per ST (Alderman 2015).Although host fish species(which may include
undulatus p Green Sunfish, Creek Chub, Channel Catfish, Largemouth Bass,
Black bullhead(Ameiurus metas),Yellow Perch(Perca flavescens),
and Spotfin Shiner(Cyprinella spiloptera)exist,the general habitat of
Lake Julian would be unsuitable(NatureServe 2017)
*Status: FE—federal endangered, FT—federal threatened, FSC—federal species of concern, SE—state
endangered, ST—state threatened.
12 Results of a 2015 mussel survey performed in the upstream and downstream vicinity of the Asheville Plant river
intake structure on the French Broad River did not collected any specimens federal or state-listed mussels
(Alderman 2015).
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The following materials were reviewed to develop the species list in Table 4-6:
• IPAC (httos://ecos.fws.gov/ipac/) (USFWS 2017) for the search area shown on Figure 4-
2, and
• North Carolina Department of Natural and Cultural Resources (NCDNCR) Natural
Heritage Program (http://www.ncnhp.orq/data/species-community-search) (topographic
maps used: Skyland, NC) (NCDNCR 2017).
Historical electrofishing results for Lake Julian are discussed in Section 4.1 of this report. No
federally or state-listed species were collected during the historical electrofishing sampling of
Lake Julian.
Several factors will contribute to the protective nature of the ACC's cooling system toward
aquatic species, such as closed-cycle cooling (BTA), a CWIS design and TSV below 0.5 fps,
and the minimal amount of make-up water withdrawn from Lake Julian in support of the ACC
units. The repurposed Lake Julian CWIS uses fixed mesh screen panels with a TSV of much
less than 0.5 fps, resulting in a negligible AOI for impingement (i.e., the AOI does not extend
beyond the face of the screens).
Operating as a CCRS substantially reduces intake volume and is also reflected in the Rule as
an impingement mortality BTA. In addition, the ACC's closed-cycle configuration will be
compliant with §125.94(e)(1) for entrainment BTA for new units at existing facilities.
4.7 Documentation of Consultation with Services
In preparing this response package for compliance with the Rule, there has been neither public
participation, nor coordination undertaken with the Services. DEP has not submitted information
to obtain incidental take exemption or authorization from the Services.
4.8 Incidental Take Exemption or Authorization from
Services
DEP has not submitted information to obtain incidental take exemption or authorization from the
Services; nor is such an exemption necessary based on the ACC technology to be employed
and the lack of any relevant species in Lake Julian.
4.9 Methods and Quality Assurance Procedures for Field
Efforts
Data presented in this report were compiled from DEP's historical and ongoing Environmental
Monitoring Program on Lake Julian. Copies of reference documents may be made available
upon request.
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• 4.10 Protective Measures and Stabilization Activities
DEP has performed habitat improvements in Lake Julian to provide additional cover for juvenile
and small fishes and to increase angling success by recreational users. During March 2010, an
artificial concrete reef was constructed in approximately 25 feet of water on the north side of
Lake Julian, east of the planned ACC footprint (Figure 2-2). In March 2010 and 2011, discarded
Christmas trees were added to the artificial reef to improve the fishery habitat within the lake
and provide additional fish attraction areas, away from the facility, for shoreline and boat anglers
(Progress Energy 2013). The tree reefs are replenished on an annual basis. Additional shoreline
habitat enhancement efforts (1998 and 2002) have included the felling and cabling of trees
along targeted sections of shoreline (Progress Energy 2013).
The design of the ACC cooling water system (i.e., use of closed-cycle cooling) and the cooling
water intake (i.e., TSV less than 0.5 fps) are anticipated to minimize impingement and greatly
reduce entrainment.
4.11 Fragile Species
In the Rule, the EPA identifies 14 species of fish as fragile or having post-impingement survival
rates of less than 30 percent. Occurrence of fragile species in Lake Julian was evaluated using
historical sampling data and is summarized in Table 4-7.
Table 4-7. List of Fragile Species as Defined by the EPA and their Occurrence in Lake
Julian and/or the French Broad River near Asheville Combined Cycle Station
ScientificOccurrence in Lake Julian in
Name Common Name
vicinity of ACC CWIS*
Alosa pseudoharengus Alewife No
Alosa sapidissima American Shad No
Clupea harengus Atlantic Herring No
Anchoa mitchilli Bay Anchovy No
Alosa aestivalis Blueback Herring No
Pomatomus saltatrix Bluefish No
Poronotus triacanthus Butterfish No
Dorosoma cepedianum* Gizzard Shad Yes
Lutjanus griseus Grey Snapper No
Alosa mediocris Hickory Shad No
Brevoortia tyrannus Atlantic Menhaden No
Osmerus mordax Rainbow Smelt No
Etrumeus sadina Round Herring No
Engraulis eurystole Silver Anchovy No
*Gizzard Shad is not included on the EPA Fragile Species list; however, it is in the same family as
Alewife and is documented as having a post-impingement survival rate of less than 30 percent.
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Gizzard Shad was the only species from the list that has been documented in Lake Julian. •
Threadfin Shad, a closely related species expected to have very low post-impingement survival,
have also been documented in electrofishing surveys performed on Lake Julian. Threadfin Shad
and Gizzard Shad typically exhibit a greater likelihood for entrainment and impingement at
CWIS due to reproductive habits, habitat preferences, and sensitivity to temperature extremes.
Mass die-offs of shad species have been documented in response to extreme winter
temperatures (at or below 9°C) resulting in large collected events at CWIS (Loar et al. 1978,
Griffith 2011). 9°C. Shad in Lake Julian may experience die-offs during winter months in
response to the loss of thermal discharges that will occur when ACC begins operations.
The facility is fully compliant with BTA alternative §125.94(e). Note however, that the
repurposed CWIS has fixed mesh screen panels with a TSV substantially less than 0.5 fps and
impingement is anticipated to be negligible at this facility based on the low TSV; therefore, a
discussion or assessment of potential fragile species is not provided in this report.
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5 Cooling Water System Data [§122.21 (r)(5)]
The ACC will utilize a closed-cycle circulating water system to supply cooling water to the steam
surface condenser and auxiliary cooling system to remove heat from the power cycle. The
circulating water system will also provide station service water(e.g., fire water and HRSG wash
water). A water balance diagram showing flow distribution at the existing facility (e.g., cooling
water and service water systems) is provided on Figure 5-1 and Table 5-1 presents the average
annual and maximum design flows (developed by CB&I North Carolina, Inc. [CB&I]) for the
ACC.
5.1 Cooling Water System
Raw water pumped from the new submersible pumps at the repurposed CWIS will supply make-
up water to the recirculating cooling towers and other plant needs for Units 05/06 and 07/08.
Each unit will consist of a dual fuel (natural gas/fuel oil) combustion turbine combined with an
HRSG that captures the exhaust heat from the combustion turbine unit, generates steam, and
delivers the steam to a steam turbine to generate additional power. Each unit will also be
equipped with a mechanical draft cooling tower. Each cooling tower will have five main
components: 1) the fans which direct the airflow upward, 2) the heat transfer section made up of
corrugated polyvinyl chloride sheets commonly called the "fill", 3) the water distribution system,
4) the drift eliminator section, and 5) the concrete basin which collects water to return to the
condensers and auxiliaries. Each of the 50-foot-tall ACC towers will consist of four cells, four
200-horsepower fans (one per cell), a 3-pass drift eliminator, and will have a total circulating
water flow of 65,106 gpm.
Heated water from each unit's condenser cooling system will be routed to the cooling tower via
circulating water piping. The heated circulating water will be cooled by the cooling tower,
collected in a basin beneath the tower, and pumped back to the condenser cooling system
where the cycle is repeated. The recirculating cooling water system is designed to operate at 10
COC during typical operations, meaning the circulating water constituents concentrate
approximately 10 times or more during operation.
The heat transferred to the circulating water in the condenser will be rejected to the atmosphere
by evaporation in the cooling tower. Evaporation does not carry away solids in the water such
as mud, silt, or dissolved solids; therefore, it is necessary to control the COC by continuously
discharging some of the circulating water to remove waste and prevent a buildup of solids in the
circulating water. This discharge, called blowdown, will be routed to the wastewater pump and
discharged to the French Broad River via the existing Outfall 001.
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Asheville Combined Cycle Station r
Asheville Combined Cycle
Uttralilr,,tion Service Water/fire Water Service Water Equipment Drains
Lake Julian )• ). ) ........ ), Tank ) Users ) Sump 10
Loop k
o Simple CoolingaaM
B Makeup
Unit 07/08 Raw \ Standby RO/Demm
Water SuppiY / ) Trailers
V
TworPess Reverse Osmosis Mixed-Bed Uemineranted
) Dern.neraieer �) Water Tanks CTG NO.election>
Note:Units 05/06 and 0708 are I /
identical in design and layout.As
such.this water balance diagram I Atmosphere
represents the design layout for
both Units. (Atnwwhere I( •
V
RAG Biowdown HRSG H
Coring Tower&Basin Tank/Sump {—��
W I A W
WON Treatment ) ( C15 Wash ``j
Building Sump A W Water Transfer Truck /
Sample Panel
A
Unit weTo I Unit 07/08
CoolingTo
losser < Oil.Water Separator]
Mr Slowdown
Side-Stream
Uniti ihiNen� i( Pikers CRI-Waterer Separator
Sludge ThiTluckener
t
A
---V--Y-- Y YY
/umro7roe finer redI
`Audge ThirkMN .11 —...—..^ Isnd(Pal )
Waste water Sump
(Shared/ ) French Broad River Outfall
001
Transfer Truck
Figure 5-1.Water Balance Diagram of the Asheville CombinedCycle Station,Arden,North Carolina(Source:CBS!2018)
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Table 5-1. Water Balance Diagram and Associated Flows under Various Design
Conditions for the ACC (Source: CB&I 2018) 1
Case Name Average Annual Max Flow Design
Stream# Design Flows 2 Flows 3
rt�� �� :, +CRI• ; ,an+ ,a"` "";^a*a?'�xn.w:w,'"�''�A»�' "✓�'":J a a ' A;��i MGD „�,��i MGD,�
1 Total Facility Raw Water Supply 1,980 2.85 2,816 4.05
2 Raw Water to Unit 05/06 990 1.43 1,408 2.03
3 Raw Water to Unit 07/08 990 1.43 1,408 2.03
4 Cooling Tower Make-up 919 1.32 1,126 1.62
5 Cooling Tower Blowdown 93 0.13 235 0.34
6 Cooling Tower Evaporation and Drift 841 1.21 940 1.35
7 Raw Water to Ultrafiltration Inlet 71 0.10 282 0.41
8 Raw Water to Service Water Tank 67 0.10 267 0.38
9 Ultrafiltration Reject&Strainer Backwash 4 0.01 15 0.02
10 Service Water to Users 50 0.07 50 0.07
11 Condenser Circulation Water Quench Water to HRSG 4 0.01 4 0.01
Blowdown Tank
12 Service Water to Two-Pass Reverse Osmosis Skids 17 0.02 103 0.15
13 Reverse Osmosis Permeate to Mixed Bed Demineralizer 12 0.02 75 0.11
14 Reverse Osmosis Reject 5 0.01 28 0.04
15 Demineralized Water System Make-up 12 0.02 75 0.11
16 Service Water Users to Oil Water Separator 50 0.07 50 0.07
17 Service Water to Unit 3&4 Evaporation Cooling&Cycle 0 0.00 0 0.00
Make-up
18 CTG NOx Injection Water 0 0.00 177 0.25
19 CTG Wash Water note 4 note 4 note 4 note 4
20 HRSG Make-up 11 0.02 11 0.02
21 HRSG Blowdown 5 0.01 5 0.01
22 HRSG Blowdown Tank Evaporation& Losses 2 0.00 2 0.00
23 Quenched HRSG Blowdown Sump Flow 13 0.02 13 0.02
24 Sample Panel Flow 6 0.01 6 0.01
25 Oil Water Separator Discharge Flow 50 0.07 50 0.07
26 Total Facility Waste Water to Plant Discharge 286 0.41 569 0.82
27 Side-Stream Filter Flow 1,912 2.75 1,912 2.75
28 Side-Stream Filter Backwash Flow 17 0.02 17 0.02
29 Sludge to Transfer Truck 6 0.01 6 0.01
30 Sludge Thickener Overflow 14 0.02 14 0.02
31 Side-Stream Filtrate 1,802 2.59 1,660 2.39
32 Unit 07/08 Waste Water Flow 50 0.07 50 0.07 •
33 Sludge Thickener Underflow 4 0.01 4 0.01
34 Filter Press Supernatant 1 0.00 1 0.00
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Case Name Average Annual Max Flow Design
Stream# Design Flows 2 Flows'
Stream Description GPM MGD GPM MGD
35 Water Treatment Building Sump Flow 18 0.03 29 0.04
36 Unit 07/08 Sludge Thickener Underflow 4 0.01 4 0.01
37 Unit 07/08 Sludge Filter Press Supernatant 1 0.00 1 0.00
38 Standby Demineralizer Trailer Flow 0 0.00 114 0.16
39 Unit 07/08 Cooling Tower Blowdown 93 0.13 235 0.34
Total Facility Inflow 1,980 2.85 2,816 4.06
Total Facility Evaporation, Losses, and NOx Injection 1,686 2.43 2,238 3.22
Total Facility Offsite Transfers 8 0.01 8 0.01
Total Waste Water Discharge 286 0.41 569 0.82
Total Facility Outflow 1,980 2.85 2,816 4.06
1) Flows for continued operation of existing Asheville Plant Units 1 and 2 during the commissioning process
are not included in this water balance table. These values do not include fire protection system flows and
service water system usage was estimated by assuming two users each at 25 GPM.
2) 58°F DB, 60%RH, Natural Gas, 10 COC
3) 86°F DB, 55%RH, Fuel Oil, 5 COC
4) CTG wash water will be appropriately managed with no direct surface water discharge
5.1 .1 Proportion of Design Flow Used in the Cooling Water System
As illustrated in the water balance diagram provided on Figure 5-1, an average of 71 gpm per
unit will be used for service water(see Stream #7: raw water to ultrafiltration inlet). Therefore,
based on the design pumping capacity of 1,800 gpm per unit, approximately 3.9 percent of the
raw water coming into ACC will be used for service water; the remaining 96.1 percent will be
used for cooling purposes.
Based on the anticipated AIF of 1,980 gpm (2.85 MGD) under the Average Annual Design
scenario presented in Table 5-1 (CB&l 2018), approximately 7.2 percent (71 gpm x 2 units/
1,980 gpm) of the raw water coming into ACC will be used for service water; the remaining 92.8
percent will be used for cooling purposes.
5.1 .2 Temporal Characteristics of Cooling Water System Operation
The cooling water system design incorporates two operating scenarios; Average Annual Design
and Maximum Flow Design (see Table 5-1). Average Annual Design assumes the ACC would
operate using natural gas as the fuel source and operate the cooling towers at 10 COC. This
design scenario represents typical or normal operations. The Maximum Flow Design scenario
assumes the ACC would operate using fuel oil with 5 COC at the cooling towers. This operating
scenario is considered to be a relatively infrequent event, for example, upon startup
commissioning and during periods of natural gas curtailment.
DEP will operate the ACC facility year-round with an expected annual capacity factor of greater
than 75 percent. However, withdrawal volumes from Lake Julian for ACC will be significantly
lower than the actual intake flows (AIF) during the previous three-year period (between January
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2015 and December 2017) in support of coal fired operations at the Asheville Plant (225 MGD •
at AIF versus 2.85 MGD anticipated average withdrawal for the ACC).
5.1 .3 Distribution of Water Reuse
The new ACC units will not reuse cooling water as process water, reuse process water for
cooling purposes, or use grey water for cooling purposes. Therefore, this subsection is not
applicable to the ACC units.
5.1 .4 Description of Reductions in Total Water Withdrawals
The retirement of the Asheville Plant's Units 1 and 2 and conversion to new combined cycle
units utilizing a closed-cycle recirculating cooling system will result in reductions in total water
withdrawals at the Lake Julian CWIS for ACC operations. Conversion of the existing once-
through operations to the new combined cycle operations decreases the DIF capacity from
316.2 MGD (i.e., 2 pumps at 48,300 gpm + 2 pumps 61,500 gpm = 219,600 gpm) to 5.2 MGD
(i.e., 2 pumps at 1,800 gpm = 3,600 gpm) for a net reduction of 311 MGD, or 98.4 percent.
Actual withdrawals are expected to be approximately 2.85 MGD on an average annual basis,
which would result in a 99 percent reduction in total water withdrawals at the CWIS.
5.1 .5 Description of Cooling Water Used in Manufacturing Process •
Cooling water from the ACC will not be used in a manufacturing process, either before or after
the water is used for cooling; therefore, this subsection is not applicable to the ACC.
5.1 .6 Proportion of Source Waterbody Withdrawn
The Lake Julian water surface elevation is dependent on rainfall runoff, natural evaporation,
seepage through the dam, and withdrawals to support plant operations. Water from the French
Broad River can also be pumped to Lake Julian to support pond elevations. At the normal lake
elevation of 2,161 ft msl, Lake Julian's storage capacity is 8,819 acre-feet(2,874 million gallons)
(WSP 2015). To determine the proportion of water withdrawn from Lake Julian on a monthly-
average basis, the estimated average withdrawal volume needed to support ACC operations
was divided by the total capacity of Lake Julian at the normal lake elevation. The proportion of
Lake Julian withdrawn for cooling purposes by the ACC plant is anticipated to be approximately
three percent based on an anticipated AIF of 2.85 MGD.
5.2 Design and Engineering Calculations
Engineering calculations of TSV for the 1-inch hexagonal mesh fixed panels and the 1/4-inch
mesh fixed screen panels are provided in Appendix C.
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• 5.3 Description of Existing Impingement and Entrainment
Reduction Measures
Substantial reductions in rates of impingement for the ACC compared to the existing Asheville
Plant will be accomplished through a TSV of less than 0.5 fps (as discussed in section 2.3 and
Appendix C). The TSV calculated for the Lake Julian CWIS for Unit 05/06 and Unit 07/08 meets
the BTA standard for new units at an existing facility at§125.94(e).
The ACC facility will also achieve substantial reductions in entrainment and impingement by
means of flow reduction. The underlying assumption for entrainment is that entrainable
organisms have limited or no motility and are conveyed passively with water entering the power
plant. Therefore, reduction in flow results in a commensurate reduction in entrainmentt3.
Reduction in flow will be accomplished by retiring Units 1 and 2. The design and operation of
two new natural gas-fired combined cycle units is estimated to reduce the DIF at the Lake Julian
CWIS (for the ACC facility) by approximately 98.4 percent (as discussed in Section 5.1.4).
5.3.1 Asheville Plant
With the retirement of existing Unit 1 and Unit 2, coupled with startup of the new ACC units, the
total facility DIF will be reduced by approximately 98.4 percent (from 316.2 MGD to 5.2 MGD).
This should result in a commensurate reduction in the potential entrainment and impingement
associated with the facility.
5.3.2 The ACC
The new ACC will be compliant with §125.94(e) BTA standards for impingement mortality and
entrainment for new units at existing facilities by installing mechanical draft cooling towers which
will reduce the DIF for the new unit to a level commensurate with a CCRS. The ACC will employ
the following supplemental measures to reduce impingement mortality and entrainment at the
CWIS on Lake Julian:
• TSV (provided in Section 2.3) at the Lake Julian CWIS will be substantially less than 0.5
fps.
• Because the expected AIF (2.85 MGD) at the Lake Julian CWIS represents a greater
than 95 percent reduction in withdrawal rates and the facility-induced TSV at the intake
will be less than 0.5 fps (regulatory threshold), the AOI for the Lake Julian CWIS's will
not extend beyond the surface of the intake screens.
• The ACC will employ a closed-cycle recirculating cooling water system by utilizing wet
mechanical draft cooling towers designed to reduce make-up water requirements. While
the number of COCs can change depending on operational conditions, an estimated 10
COC will provide a flow reduction of 98.4 percent compared to a once-through system.
Since reductions in impingement and entrainment can be assumed to be commensurate
13 This is the underlying assumption in EPA's calculation of entrainment reduction associated with closed-cycle cooling
—see EPA 2014.
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with reductions in flow, it is assumed that the use of closed-cycle cooling at the ACC will
reduce potential impingement and entrainment by 98.4 percent.
In addition to the design aspects and expected operations of the ACC facility, the following are •
also important considerations in determining BTA standards for impingement mortality and
entrainment:
• The ACC will withdraw water from Lake Julian; a cooling pond (impoundment) permitted
and constructed in part on WOTUS for the purpose of providing cooling for electric
generation (North Carolina State Board of Health 1963)(see Appendix A). All of the
species identified as potentially subject to entrainment are common to the region.
• The species found to have a higher likelihood of entrainment at Lake Julian (Threadfin
Shad and Gizzard Shad) comprise a low relative abundance of fish sampled through
electrofishing surveys (between 0 and 7.7 percent). As described in Section 4.2,
electrofishing studies indicate Lake Julian exhibits a balanced fish community. This
suggests Lake Julian contains a sufficient foundation of reproduction, recruitment, and
mortality for sustainable predator populations and prey base. Further, Lake Julian
supports an active recreational fishery.
• No federally listed fish species or critical habitat designations exist within Lake Julian
near the CWIS (USFWS 2017).
As outlined above and in the section that follows, the design and operations of the ACC facility
will employ measures to minimize impingement mortality and entrainment such that no
additional control measures are considered necessary.
5.3.3 Best Technology Available for Entrainment
Although the ACC closed-cycle cooling system will be compliance with the BTA requirement for
new units at an existing facility (§125.94(e)), the following information is provided to support the
conclusion that the retirement of the existing Asheville Plant and operation of the new ACC units
will result in the maximum reduction in entrainment warranted.
The number of organisms expected to be entrained is low. Since entrainment is proportional to
flow, reductions in flow equate to commensurate reductions in entrainment. The retirement of
Units 1 and 2 reduced the DIF by 98.4 percent (from 316.2 MGD to 5.2 MGD). As a result of the
proposed flow-reduction measures, AIF is expected to be approximately 2.85 MGD at the ACC.
No federally or state-protected species were collected in previous electrofishing sampling on
Lake Julian. In addition, according to the USFWS IPAC database, there are neither protected
species nor critical habitat designations for Lake Julian (USFWS 2017).
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6 Chosen Method(s) of Compliance with
Impingement Mortality Standard
[§122.21 (r)(6)]
The new ACC units will be equipped with a CCRS in the form of cooling towers. A closed-cycle
recirculating system satisfies the impingement mortality and entrainment BTA standards for new
units at§125.94(e).
6.1 Design TSV
It is recognized by the EPA that an intake TSV of 0.5 fps or less establishes a threshold based
on the assumption that, at velocities below this value, most healthy impingeable-sized fishes will
be able to swim freely and avoid impingement. .
The ACC cooling tower make-up water will be withdrawn at the repurposed Lake Julian CWIS,
which is comprised of four identical intake bays. Each bay will be equipped with a new
(replacement for historic) submersible pump with a design capacity of approximately 1,800
gallons per minute (gpm) (2.6 MGD). The ACC units are designed to operate with two pumps
(the remaining two pumps provide redundant pumping capacity). As a result, the combined DIF
capacity for the new ACC units is 3,600 gpm (5.2 MGD).
The average design TSV based on the existing hexagonal mesh screens is between 0.034 fps
(at normal water surface elevation) and 0.039 fps (at low water surface elevation). The average
design TSV based on the new 1/4-inch mesh screens is 0.043 fps (at normal water surface
elevation) and 0.049 fps (at low water surface elevation). At DIF the average TSV for the
hexagonal mesh screens at the front of the CWIS and the new '/4-inch mesh screens (to be
located inside of the CWIS) for both units (at normal or low water surface elevations) is
considerably lower than the 0.5 fps threshold established by the Rule. As such, the
impingement AOI at the ACC is negligible because the area over which the intake-induced
velocity is greater than 0.5 fps does not extend beyond the face of the screens. The ACC design
TSV (which is substantially lower than the 0.5 fps threshold established for impingement BTA)
would protect greater than 96 percent of fish from impingement at the CWIS on Lake Julian.
6.2 Requirements of Make-up Water Minimization for
Closed-Cycle Recirculating System
According to the Rule at §125.92, a CCRS is "...designed and properly operated using
minimized make-up and blowdown flows withdrawn from a water of the United States to support
contact or non-contact cooling uses within a facility...". A CCRS withdraws significantly less
water from its source water body than a once-through cooling system. The actual reduction in
withdrawal volume depends on the design and operation of the recirculating cooling system.
The site-specific design and operating parameters of the closed-cycle cooling system at ACC
are presented in Table 6-1.
Duke Energy 145

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
Table 6-1. Site-Specific Design of ACC Closed-Cycle Cooling System
(CB&l 2018)
Design and Operational Parameters Values
Condenser cooling water flow and The cooling towers for ACC are designed to cool 65,106 gpm
condenser temperature rise (i.e., delta T) with a temperature range of 17.7° Fahrenheit(°F) (-7.94°C).
COC at which the cooling tower is The circulating water system is currently expected to operate
typically operated at 10 COC.
Drift eliminator efficiency
Drift loss (% of cooling water flow) is estimated to be 0.0005
percent.
The design MW rating of ACC is 560 MW(2 power blocks at
MW rating of ACC generating blocks 280 MW each). The summer/winter net electrical generating
capacity of each block is estimated at 250 MW/280 MW.
Evaporation, drift, and blowdown rates are compiled and summed to determine volume of
make-up water withdrawn at the CWIS:
Make-up flow = Evaporation (E) + Drift (D) + Blowdown (B)
where:
E = 0.0008 x Condenser temperature delta T (°F) x Condenser CW flow rate (gpm)
D = Drift eliminator efficiency x Condenser cooling water flow (gpm)
B = [E-{(COC-1) x D}]/(COC-1)
Then, make-up flow is compared with condenser cooling water flow (i.e., once-through flow) to
determine the degree of flow reduction.
Using the cooling tower flow of 65,106 gpm, delta T of 17.7°F (-7.94°C), drift eliminator
efficiency of 0.0005 percent and 10 COC (CB&I 2018), the calculations for evaporation, drift,
and blowdown rates are as follows:
E = 0.0008 x 17.7°F x 65,106 gpm = 921.9 gpm
D = 0.0005 x 65,106 gpm = 32.6 gpm
B = [921.9 —{(10-1) x 32.6}]/(10-1) = 69.8 gpm
Make-up Flow for 10 COC = 921.9 + 32.6 + 69.8 = 1,024.3 gpm
Therefore, the calculated total ACC make-up water flow14 for 10 COC is 1,024.3 gpm (1.48
MGD). As a result, the percent flow reduction compared to a once-through cooling system is
98.4 percent ([65,106-1,024.3]/65,106 X 100).
DEP anticipates that the make-up water flow to the cooling towers installed at ACC will be
minimized to the maximum extent possible within the constraints of practicality, scaling, other
operational issues, and the need to comply with NPDES discharge limits.
14 Based on CB&I Document No.ACC00-SP-M-CW-01; represents the total designed capacity for the cooling towers.
Duke Energy 146

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
7 Entrainment Performance Studies [40 CFR
§ 122.21 (r)(7)]
7. 1 Site-Specific Studies
Site-specific entrainment has not been evaluated for the new ACC units as they have not
commenced operation. Site-specific studies are neither required by the Rule nor relevant to the
ACC because the facility meets the entrainment BTA standards for new units.
7.2 Studies Conducted at Other Locations
As of the date of this report, no entrainment performance studies conducted at other facilities
have been determined relevant for documentation in this section.
Duke Energy I 47

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
8 Operational Status [§122.21 (r)(8)]
The existing Asheville Plant Units 1 and 2 are scheduled for decommissioning and demolition. •
The construction and commissioning of the ACC is scheduled for completion by November
2019.
8. 1 Asheville Plant Units 1 -4
Asheville Plant coal-fired Units 1 and 2 were commissioned in 1964 and 1971, respectively and
are 54 and 47 years old, respectively. Units 1 and 2 will be retired following the completion of
the new ACC. Asheville Units 3 and 4 consist of 324 MW GE 7FA simple-cycle combustion
turbines constructed in 1999 and 2000. These combustion turbine units use compressed air to
supplement the power supply when electricity demands are highest. Units 3 and 4 will continue
to operate as required to meet electrical demand. The operation of Units 3 and 4 do not result in
cooling water withdrawals.
8.2 ACC Units 5-8
ACC Unit 05/06 and Unit 07/08 are currently under construction with an anticipated completion
of construction and commissioning by November 2019. Units 05 and 07 are natural gas/fuel oil
combustion turbines, which generate heat that will be captured and delivered to steam turbines,
Units 06 and 08.
8.3 Major Upgrades in Last 15 Years
The ACC represents a new unit at an existing facility. No major upgrades have been completed
that would be applicable to the ACC or its operations.
8.4 Descriptions of Consultation with Nuclear Regulatory
Commission
Neither the ACC nor the existing Asheville Plant units are nuclear facilities; therefore,
consultation with the U.S. Nuclear Regulatory Commission is not required and was not initiated.
8.5 Other Cooling Water Uses for Process Units
The ACC will not use cooling water for process units; therefore, this subsection is not
applicable.
8.6 Description of Current and Future Production
Schedules
The ACC is not a manufacturing facility; therefore, this subsection is not applicable.
Duke Energy 148

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
8.7 Description of Plans or Schedules for New Units
Planned within 5 years
A 186-MW, natural gas-fueled simple cycle F-frame combustion turbine may be added to the
ACC facility around 2023 (DEP 2015) depending on energy reduction efforts, technology
advancements, and peak load demand in the region.
In response to growing customer demand for renewable generation, other plans for the ACC
include the addition of solar generation, which would be installed on a portion of the land made
available after the decommissioning of the 1964 Ash Basin (refer to Figure 1-1 for location).
No additional water withdrawals are anticipated for the future plans of the ACC facility.
Duke Energy 149

Clean Water Act§316(b)Compliance Submittal L11
Asheville Combined Cycle Station rJ`
9 New Units [§122.21 (r)(14)]
The new ACC Units 05/06 and 07/08 are considered new units at an existing facility (as defined
at §125.92(u)); therefore, the ACC is required to be compliant with the impingement mortality
and entrainment BTA standards under §125.94(e) of the Rule.
9.1 BTA Standards for Impingement Mortality and
Entrainment for New Units at Existing Facilities
Under§125.94(e) of the Rule, a new unit at an existing facility must achieve the impingement
mortality and entrainment standards provided in either paragraph (e)(1) or(2). Under
requirements of§125.94(e)(1), the new unit must reduce DIF, at a minimum, to a level
commensurate with a CCRS. The new ACC units will use closed-cycle cooling systems that
meet the definition of§125.92(c) and comply with §125.94(e)(1). Further, the TSV at DIF for the
repurposed CWIS, based on the anticipated operations of ACC, is substantially less than 0.5 fps
of the Rule.
While the number of COCs can change depending on the operating conditions, the cooling
towers will generally be operated at 10 COC and will provide a flow reduction of at least 98.4
percent from the withdrawals required under the existing once-through system. Since reductions
in impingement and entrainment can be assumed to be commensurate with reductions in flow,
the retirement of the existing coal units and commencement of closed-cycle cooling at the ACC
is assumed to reduce potential impingement and entrainment by at least 98.4 percent.
Calculations of COC will be performed to document the minimization of make-up water to the
closed-cycle recirculating cooling water system.
Duke Energy 150

Clean Water Act§316(b)Compliance Submittal 1j
Asheville Combined Cycle Station
10 References
Alderman Environmental Services, Inc. (Alderman). 2015. French Broad River Mussel Surveys.
Prepared for Duke Energy. September 22, 2015.
Brierley, A. 2014. Diel vertical migration. Current Biology, Volume 24, Issue 22: R1074-R1076.
November 2014.
Carlander, K.D. 1977. Handbook of Freshwater Fishery Biology. Vol. 2. The Iowa State
University Press, Ames, IA. 431 pp.
Carolina Power and Light (CP&L). 2001. Asheville Steam Electric Plant, 2000 Environmental
Monitoring Report. Environmental Services Section, Progress Energy Company. New
Hill, North Carolina. June 2001.
CB&I North Carolina, Inc (CB&I). 2018. Asheville Combined Cycle Project, Document No.:
ACC00-ME-M-WB-01. Prepared for. Duke Energy Progress, LLC.
Cornish, M. and K. Welke. 2004. Bluegill (Lepomis macrochirus). In: Pitlo, J.M. Jr. and J.L.
Rasmussen (eds.). UMRRC Fisheries Compendium. 3rd Edition. Upper Mississippi
River Conservation Committee. Rock Island, Illinois. January 2004. p. 177-180.
Duke Energy Progress, LLC (DEP). 2005. §316(b) Supplement to NPDES Permit NC000396
Reissuance Application Package, submitted to NC Division of Water Quality, 2005.
. 2007. Asheville Steam Electric Plant, NPDES Permit Renewal Application
Package, submitted to NC Division of Water Quality, 2007.
. 2015. Clean Water Act§316(b) Strategic Plan-Asheville Steam Station.
. 2017a. North Carolina Integrated Resource Plan, September 1, 2017.
. 2017b. Unpublished data from Environmental Monitoring Program on Lake
Julian and the French Broad River, electrofishing data 2015 and 2016.
Ehrlich, K. F. 1974. Chemical changes during growth and starvation of herring larvae. Pages
301-323 in J. H. S. Blaxter, editor. The early life history of fish. Springer-Verlag, New
York.
Electric Power Research Institute (EPRI). 2004. Using Computational Fluid Dynamics
Techniques to Define the Hydraulic Zone of Influence of Cooling Water Intake Structure.
1005528. EPRI, Palo Alto, CA.
. 2007. Cooling Water Intake Structure Area-of-Influence Evaluations for Ohio
River Ecological Research Program Facilities. 1015322. EPRI, Palo Alto, CA.
Emig, J.W. 1966. Largemouth bass. In: A. Calhoun (ed.). Inland Fisheries Management. State
of California, Department of Fish and Game.
Etnier, D. and W. Starnes. 1993. The Fishes of Tennessee. Knoxville: The University of
• Tennessee Press. 1993.
Duke Energy 151

Clean Water Act§316(b)Compliance Submittal FIN
Asheville Combined Cycle Station
Gebhart, G. E., and R.C. Summerfelt. 1978. Seasonal Growth of Fishes in Relation to
Conditions Of Lake Stratification. "Oklahoma Cooperative Fishery Research Unit 58
(1978): 6-10. Oklahoma State University, Stillwater, Oklahoma.
Golder Associates. 2005. Crystal River Energy Complex Proposal for Information Collection.
NPDES Permit No. FL0000159. Prepared for Progress Energy.
Griffith, G.E., J.M. Omemik, J.A. Comstock, M.P. Schafale, W.H. McNab, D.R. Lenat, D.R. and
T.F. MacPherson. 2002. Ecoregions of North Carolina. U.S. Environmental Protection
Agency, Corvallis, Oregon. (map scale 1:1,500,000).
Griffith, J.S. 2011. Effects of Low Temperature on the Survival and Behavior of Threadfin Shad,
Dorosoma petenense. Transactions of the American Fisheries Society, Vol. 107 (1).
Heidinger, R.C. 1975. Life history and biology of the Largemouth Bass. Pages 11-20 In: R.H.
Stroud and H. Clepper (eds.). Black Bass Biology and Management. Sport Fishing
Institute, Washington, D.C.
Hunter, J.R. 1963. The Reproductive Behavior of the Green Sunfish, Lepomis cyanellus.
Zoological 48(1): 13-24.
Loar, J.M., J.S. Griffith, and K.D. Kumar. 1978. An analysis of factors influencing the
impingement of threadfin shad at power plants in the southeastern United States. Pages
245-255 in L.D. Jensen, editor. Fourth national workshop on entrainment and •
impingement. EA Communications, Melville, New York.
Leonard, P.M., and D.J. Orth. 1988. Use of habitat guilds of fishes to determine instream flow
requirements. North American Journal of Fisheries Management 8:399-409.
May, R. C. 1974. Larval mortality in marine fishes and the critical period concept. Pages 3-19 in
J. H.S. Blaxter, editor. The early life history of fish. Springer-Verlag, New York.
Mehner, T. 2012. Diel vertical migration of freshwater fishes— proximate triggers, ultimate
causes and research perspectives. Freshwater Biology, 57: 1342-1359.
Miller, R.R. 1960. Systematics and biology of the gizzard shad (Dorosoma cepedianum) and
related fishes. U.S. Fish and Wildlife Service, Bulletin 60: 371-392.
Miller, T.J., Crowder, L.B., Rice, J.A., Marshall, E.A. 1988. Larval size and recruitment
mechanisms in fishes: toward a conceptual framework. Canadian Journal of Fisheries
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NatureServe. 2017. NatureServe Explorer: An online encyclopedia of life [web application].
Version 7.1. NatureServe, Arlington, Virginia. Accessed: October 2, 2017.
http://www.natureserve.orq/.
North Carolina Department of Environmental Quality (NCDEQ). 2017. French Broad River Basin
Documents. Accessed March 6, 2017. https://deq.nc.gov/about/divisions/mitiqation-
services/dms-planning/watershed-planning-documents/french-broad-river-basin.
Duke Energy 152

Clean Water Act§316(b)Compliance Submittal FI
Asheville Combined Cycle Station r
. 2018. Water Withdrawal and Transfer Registration Annual Water Use Reports.
Accessed August 7, 2018.
http://www.ncwater.orq/Permits and Registration/Water Withdrawal and Transfer Re
qistration/report.
North Carolina Department of Natural and Cultural Resources (NCDNCR). 2017. North Carolina
Natural Heritage Program. Accessed January 17, 2017.
North Carolina State Board of Health. 1963. Permit for Impounding and Maintenance of
Impounded Water, North Carolina State Board of Health, Sanitary Engineering Division.
Raleigh, North Carolina. July 12, 1963.
Page, L.M. and B.M. Burr. 2011. A field guide to freshwater fishes of North America north of
Mexico. Boston : Houghton Mifflin Harcourt.
Pflieger, W.L. 1997. The Fishes of Missouri. Missouri Department of Conservation, Jefferson
City, MO. 372 pp.
Pitlo, J., D. Dieterman, and G. Jones. 2004. Largemouth bass (Micropterus salmoides). In: Pitlo,
J.M. Jr. and J.L. Rasmussen (eds.). UMRRC Fisheries Compendium. 3rd Edition. Upper
Mississippi River Conservation Committee. Rock Island, Illinois. January 2004. pp. 169-
173.
Progress Energy Carolinas, Inc. (Progress Energy). 2010. NPDES Permit Renewal Request
Asheville Steam Electric Plant. Permit Number: NC0000396—Attachment#2.
2013. Asheville Steam Electric Plant, 2010-2011. Environmental Monitoring
Report. Water and Natural Resources Section Environmental Services Department,
Progress Energy Carolinas, Inc. New Hill, North Carolina. April 2013.
Rohde, F.C., R.G. Arndt, D.L. Lindquist, and J.F. Parnell. 1994. Freshwater Fishes of the
Carolinas, Virginia, Maryland, & Delaware. The University of North Carolina Press.
Chapel Hill, NC. 222 pp.
Rohde, F. C., R. G. Arndt, J. W. Foltz, and J. W. Quattro. 2009. Freshwater Fishes of South
Carolina. University of South Carolina Press, Columbia, SC. 430 pp.
Spotte, S. 2007. Bluegills: Biology and Behavior. American Fisheries Society, Bethesda,
Maryland. 214 pp.
Tomelleri, J.R. and M.E. Eberle. 1990. Fishes of the Central United States. University Press of
Kansas. Kansas.
U.S. Environmental Protection Agency (EPA). 2014. Technical Development Document for the
Final Section 316(b) Existing Facilities Rule. EPA-821-R-14-002. Washington, DC.
U.S. Fish and Wildlife Service (USFWS). 2017. Information for Planning and Conservation Data
Search. Accessed October 1, 2017. https://ecos.fws.gov/ipac/user/login.
Wiegel, Robert L. 1964. Oceanographic Engineering, Prentice-Hall, Inc. Englewood Cliffs, NJ.
WSP. 2015. Bathymetric Survey Asheville Cooling Lake (Lake Julian). Arden, NC.
Duke Energy 153

Clean Water Act§316(b)Compliance Submittal En
Asheville Combined Cycle Station r
A
Appendix A
Permit for Impounding and
Maintenance of Impounded Water
Issued in 1963

C
MEMOCRS
XC .'':'i t CA:.v_;
CHARLES R CUCG_ M. D., PnCn. F.ALLICK
:OHN R. CCNZ t, !d.7-•V1CC.PRC>f. WINSTON:.ALCM
�,. A. ! .r►. '1 t .�.. T • L. ED'.VAROS. D.O.G. .. •. . WASNINtTON
�` lr�i.. ..% �/ a ... Mn J. E. LATTA MILLcnon7, RT I
LEN.OX D. DAK=R, M.D. DunNAM
t,i, .. !l ROGER W. MORRISON. M.D. . . A ILLC
• \'' ' .. __ •• EARL W. CRIAN, b..D. . RAtCICN
F'ir.LriC:'{ JASPER C, JACKSON. P4. C. . . LUMUCR:ON
GEN W. DAWSEY. D,V.Lt. . GASTOhIA
J W A. NORTO\. t-: 6. AS PH.
:T'TL K.A4 n CIr,CCTOR
Ahs
SCCRCTARY.1 RCASuw:n t'• 1 v 1 2, 1 ..
I7A7C KCALTn niRCCTon
(Pcn d No. 1?, County E�cc,'oo
Dear Sir:
Enclosed ?s your UPerrit for impounding and :aa?n_'us-
T3 Ince o= T:no'L^_ded 1.7ata_ tt with a copy of your applica-
tion attached&
Very truly yours j /
Charles M0 White, Chief
insect and Rodent Control Section
Sanitary Engineering Division
Enclosures
CC: Health Officer
CC: Soil Conservztiorist
c

C.
ir.ctr3' tions for Izreparation of Appli tion For Approval of
Plano end isseanee of "Certificate of .';rival" or "Pe-emit"
1. Application must be made in duplicate on this form. Failure to '
do so, or to fill in c:.':nr•l:?tel:e ._il blank spaces and f:,.rniah all in-
formation regi ir-d will dela;, tho e:-•amination and approval of the plans
and the issuance of a 'Certificate of Approval" or "Per.9it".
2. The application Lust be signed by the Mayor or City Manager of a
municipalit7-, the Cheirm7n of a z:ritary district board, the owner or
proper officials of a corporation, or the legally constituted board or
commission having charge of the proposed works. The signature of the
designing engineer or other agent will be accepted only if accompanied
by a letter of authorization.
3. Plans, sp' cif tcations and other supporting data must be_-submitted-•----
' in.duoliaate in accordance with the Rules and 'ste al .tions of the Com-
mittee .regarding the preparation and submission of same.
4. The Committee will expedite the studs and review of all applica-
tions and plans relating to proposed pallu ion_aba.temart projects as
rapidly as rossic_c; however, the applicant shvrld allot: a period of
at least 30 days for .. :?ch study and- revieri after all documents have
been furiiiJheti. The applicant should take into account this period of
delay when scheduling other action, such as s.ivertising and receiving •
bids, aw .rdi:;g ccntrecte.ei d bei;•i,ra.'.ing construction of the proposed
works.
•
C

\\Pond No. 13
.-. North Carolina State 3oard of Health
Sanitary _nsineering Division
Raleigh, North Carolina
PERMIT FOR IMPOUNDING AND MAINTENANCE OF IMPOUNDED WATER
Issued to:
Name Carolina Power ? LigLt Conpa.ny
Address -1,1 ci�'h i.or a Carol: a
The construction of an im ou_ded water project, described in an an-
Junolication for a permit to impound water dated_ i , 1963
having been completed in accordance with the requirements of the N. C. ;:v,* ..
Board of Health, this permit for impounding and maintenance of impounded
water is issued this day of y , 196 3
Section P. of Regulation No. 32 of the Regulations of the N. C. State
Board of Health Governing the Control of Communicable Diseases, a copy of
which is attached and forms a part of this permit, shall be observed ex
cent provisions thcr.:oi as may be specifically waived in writing. This
permit shall remain in force so long as the holders thereof maintain the
impounded water in a condition which does not render it a menace to the
public health.
J. W. R. Norton, N. D.
State Health Director
•
By i"
Charles M. White, Chief
Insect and Podc;it Control Section
Sanitary Engineering Division
,r°

APTh?CI i"E TS 7-Y ;,7E i'.i L i'_" :1't'
To be s bm.itte:i in yltr.ipli;tc ',;c:
North Car,:].;_na State B .rd of Hcalth
Sanitary Ln!3incc'rir.g Division
"s l eirh, I'or tir Carolina
(a) To imnoand anter For - -]=._nd. :s.
(b) To raise the level of an existing pond
1, County i uncombe Township Limestone
2; Location in relation to two or more well-kncton lcndt;arks:
Lake is locat-d on Ioke11 Creek 2000 feet upstream of confluence with French
Bror.:i F'ive.r anac::?:.. s urc ri - i.noroximately 1 1e to a point adjacent to
Tii-rhwav U.S. 29.
3, Pe;snn nuking, oprlicatior as owner Caroline, Pnwer T,ictt Company
Ii. A 1.reas rf c rrrr .. Caroli
7. Purpose of the pr'`jcct i, a for tl l l `lric t.tio`:
6. Approximate n'.mibr of persons l:virlx; Within on :Wile of f,.� proposed res-
ervoir or pon l
7. kpprnxi:ratc area to Le cover'' 'ry rc scrroirM._ 320 acres
8. Uiarc f;er cf Irai n 1t bt.ttvm of dam :o faci]iti el for ful]v empty' h
9. U::scri:t,ir. c.f :c.vice for fluct.atirlr water 1c:vcl 1000' wide uncontrolled
spillway with creta et no water e1° v. 2160' p',is 36" concr•ete_i.pe
e_r'a in with in,' 1
10. ►5i11 stiff c:irn� t" :no be :w3liable fr'r .' aintaini.ri? ponq after it poundage
so that it will not i rodh.',ce T?c:,q'ti`,r es?
11. Date ;when it is dcsircci to start co :stcuctiott Actually started nay 1962
12. u'te when it is •.I�s_.red to impound water Ac'. :'illy started April 1, 1963
In naki n" 't.ti s al.plielLicn) 1 3 ,rcL to cvinr.ly w?to t4ie reuia4icn povc.rnin
imroandld Crater a-:a so 'r-tintain trio pt:ii that it will not produce mosquitoes and
thcr by become a n.i: once :i in erc'.ts t_ U::e r. blic health.
Place Ralei h, Nori.h Carolina Date June 12, 1963
Car40a.2Xwer & Light Company
nature 76.:41.•••C-/,%!1/..'-5{f
E::ecutive Vice President

,.._
•
3. i : B . 1 ,SL� 0 Sfit, B \ 1 (' L' S
•;N I ti r n B I' ri a A c E n
• ENGINEERS • CONSTRUCTORS - MANAGEMENT CONSULTANTS
TWO RECTOR STREET
NLt`, iUith b
Cwb5CC:'
Carotin_.' Power ...• Lio"b C4mpany
P 0 o:: 1551
Ra1eit,h, :tionth C�:rolirc
CAROLI;,., PC7....R ?' L1027' CL + a_11r
S?iLTl" IDE S
.''i:_: C0UL' ,s
Sear Colby: :
.m ncicoc art four copies of the o.pol'?cation for permit to
l n,.e to be S'fc ._ttc'a to the North Carolina
"'7 3f Also e::e. 'r .... are U_`=.. ':'. T. ... ..z o dr .r.i-_
t.
.l �' with aheS`. ». L.tI' aa.. .. r�».J�r LLe ^L.`:.r:: ioo
ana of
• '.. re have -..isellosed this rl^ztte. ._with
. T Ch?r1es t Y� 1Lt e,yChief of
R.Dclen . Cor Ses i� ofDiv rjon. o
the he ...f.. .,.:>e•2 .,_. M it 111 _... :ti:-,_,__._ to E,ub.';it
Ftr a... ti-...... ..-� ,.t.. ..L._...5, U:.....0 ...L«la s.+ he ..<... ...,..... yr...6::.LE.'.°....
l
Ver: truly o,.xs,
H W
Chief Co c C:'•._ 'F,ydraulie Ln,ineer
Fly 01'6'
`rA
cc: # Fuson 0 i �
J Jones
n .a
!'. J
E C ,W r/a Pu1ito/\ Cher
L C Ya z/C E Dyer/P R Lo}as o
T C Aoyt/J F ;L..,..11/V S
E "i .:vuber/0 D lies/J A Scarola 'a H '-tern

NORTH CAROLINA
!DEPARTMENT OF WATER RESOURL ..4
STATE STREAM SANITATION COMMITTEE
i7RALEIGH
RALEIGH
t dr t`4 1
X1 I1
1
January 2, I963
Yr. E. B. Hebinson
Vice President &rtd General Manager
Carolina rower 1 L c;uht Company ._.�..�..
Raleigh, :"oath Co.e.Ai.na
Tp) Subjects Permit/ o. 260
Carolila Power & Lam: u Company
SkylLnd Steaa,cleotrio Plant
Eunoo:�D'e v-ity, North Galina
v
Dear Ni'. Robinson:
Iii accordance with your application dated October 16, 1962, we
are forwrding• herewith Permit i.e. 260, d.at.:3 Sane.=ary 2, 1962, to Caro-
lina. Power Light Company, Steam :.i:.eotrio Plant, authorizing
the construction of a 330-nose cooling pond for Unit ro. 1 for an c ti-
m^tell a7cr..Go daily flow of 3.0 ii.G.D., ani. the diioh.l.rge of the efflu-
ent into ro:rell Creek, a tributary in the _`Tench Broad River twain.
This Permit shall bo effective from the d7te of issuance until
modified or rove ¢.ur uant to ('•. S. 143-215.1 and shall be subject
to the cohlitionlimitations as specified. therein.
;.e co:apleta sets of the approved plans are being returned to you.
Sincerely yours,
;Is 7 V 1 „.0
7. C. .usbard, 1%ireo uor
Division of Stream bauitc,tion ea Hydrology
• closure
cotMr.
s. A. J. S?:a 1e✓r
• • Mr. C. P. Rouse
Nr. t.. E. i o"iorio

] t NORTH CAROLINA
,r► t'j STATE STREAM SANITATION COti`�ITTEE
di c?'rRaleigh
. �r � 1•¢" PERMIT
Far the Discharge -of Sewage, I duatrial "astas and Other Wastes
In accordance with tho provisions of Article 21 of Chapter 143, General Statutes
of horth Carolina as amended, and other applicable Laws, Rules, and Regulations,
PERMISSION IS HEREBY GRANTED TO
Carolina Power a Light Company
Skyland Steam .lectrio Plant
Buncombe Counter, 'NIorth Carolina
FOR THE
oonstruotion of a 330-acre cooling pond for Unit No. 1 for an
estimated average daily flow of 3.0 M.G.D., and the discharge
of the effluent into Powell Creek, a tributa.y in the French
Broad River :Bae in,
in accordance with the application dn.tod uotaber 16. 1362 ,, and in conformity
with the plans and, other supporting Oata, all of w .ich are filed with the State
Stream Sanitation Committee, and are considered a part of this Permit.
This Permit shall bs effective from the date of its issuance until modified or re-
. vo ad pursuant to C. S. 143-215.11 and snail be subject to the following specified
. conditions and limitations'
1. This Permit shall become void unless the facilities are oon- _
struated in accordance with the approved plans, e1ecificatiome,
and other supporting data and are completed and placed in opera-
tion on or before aly 1, 1;7-4_, or aa this date may be amended
by t_:e State Stream sanitation Coamittee.
2. Thio Permit is effective only with respect to the nature and
volume of waste <;
coolingwater ecoriaed in the application and
other supporting data for 'Unit ?.o. 1.
3. The cooling pond shall be prorerly operated and ,:maintained
in such a manner as to effect overall reduetiona in thermal pol-
lution substantially in keeping with thn e indicated in the sup-
porting data submitted with the application and to produce an
overflow spillage of such quality as to trotoat the receiving
stream in accordance with tho assigned olcesiuication and water
quality standards.
Permit issued this the 2nd day of 1511.
w . n
Si7ned
�. C. i.0 ivard, .7tcrota1y
State atrsam Sanitation Committee
Permit No. 60

NORTH Ce,lt0 ".
wTnTc: SlitSAII Si,:.Ir., fi4 :(i".'..�T..'.l':
STATE DEele:Tie.N:i OF :lei-a :1;..;0URCES
1t P. O. 30X 9392
r� RALEIGH
�� � .
�>Wr
APPLICATION FOR liFltl+�lnla OF ?Ecol; AND ISSII,;CIC: OF
"CERTIFICATE OF APPROVAL" OR "PERM"
,,re TO
tp DISC;iARGE SE'•1AG3, INDUSTRIAL '.!A`Si' $ OR TREATMENT ?L.,2iT .
' EFFLUENTS MO TIG; 1i'TtlU OF THS STATE
c
October 16, .19 62
To: The State Stream Sanitation Committee
Raleigh, Norte Carolina
Gentlemen:
In accordance with the provisions of Article 21 of Chapter 143, General Statutes
of Perth Carolina (Chapter 606, Session Laws of 1951), application is hereby rade
by an officer of the Cirolina Power & Light Company,
'Name of board, individual or others) (Same of city, village, town,
A Public S rviec Corporeticn , in the county of Wake , to the State
' sanitary district or eetabliahaent) (!Iare of county)
Streen Sanitation Committee for approval o.' the accomrennying plans, opecifications and
other data ssbaitted herewith covering a 330 acre cooling pond for the proposed _
19C 1"d unit a; the Ccapany's new Skyland Steam Electric •&tat•}ea in Buncomb Coun'y.
W.;er use data is shown in the accorpar{ing Exhibit "A".
and for a "Certificate of Approval" and/or "Permit" for the discharge of
setra:'o,
Heated water from the Condenser for serving .
industrial waste or combinations) (sewers or treatment plant)
Unit No. 1 of the Skyland Plant into Ssrface
t (Neee of meeicipelity, 'nctitution, or indisLry, etc.f Teurface o.• ground .rate .
waters of Powell Creek__ ___ _ _ ._
(:lane of water course if surface :raters; if ground watera, state waxer
at S3850; W7900 (Plant Coord_5vete _____^
course to wuich they are tributary) (Exact location of mint of discins__a
The plans for the proposed works have been prepared by Ebanco Sic Sneerp'r ed
• ( naineering 'ire)
of 2 Rrctor St, New York 6. NIt in estimat^d that treatment worka will provide
(address) r',
adequate capacity to serve tho Skyland Steam ElectriceStet•ftrn for a
(City, town, eanit.ary district or establishment)
period of `;r) years, at 'which time it is estir.::ted the average drily,, ewaye,Or waste
flow will not exceed 3,eee,0e0 eedlone. It is further expected that the treatment
works will effect overall reductions in pollution an follow: B.O.D. (5-day
20°C A °o, etteren cd colitis A /, total solids P _, coliform bacteria A %
and toxic materials * A '4. The cost of the eropased works is estimated to be:
sewers S A , pumping stations S A , treatment plant S A ,
others $ A . The works will be completed and in operation on or before
f May 1, 1964 .
The applicant hereby nerees that the proposed works will be constructed in strict
accordance with tie, approved plans earl a 'ecificationa or auh^e.lunntly approved c:ren.;o:
therein and further ngroes to ?dace its operation under the care of a competent perste .
and to maintein and operate the plant accordin, to the best accepted practice and in
accordance wit:: the plans and opecificatione approved by the Committee.
j Signature .
Title
Mailing address
* Specify ecreentngn reinn/inn far nar'h toxic n+:hntence, tieing cE!ditional sheet, if
nocennary.
A Not applicable
f ($ w
L ,, inr*:ru'tinus on reverse aid:)

qtr
r �r •
`'.
;r [ 13 \ SL' {:i sI1, [� \ ICES
'
.-.t•Nf✓ I . rnitI' 0 [t .% tI: 11
ENGINEERS - CONSTRUCTERS - MANAGEMENT CONSULTANTS
nr.crou '.;TNI"ET •
•1._ i _ : . :.
P 0Box 15;
S
Dear Colby:
fox.: cop:c5 of ...3 appliesti:R for permit to
to to s....:'4tC:1 ;;o the iTorth Cerolsha
_r G Z:_.:C
e .......... • V r ... w�. . .. - �..._ . r.... r..r. _ _ .__� :4�Jr". J.. v.:3i1 4L:: Io catio..
of
. .:: have iic^.:.s'r_ this : i.`er 'ith ::r Charles i i ..:i1t:e, Chief of
Divl.s4.c:Z o.
T.Lo . . r f ... .1.. .. _.'�:':_ _'3 ...;.: _�
fid.. jj
4'.r.. _7J........r r.. 4'.
a . �..� G1 rrii.. :.,; £♦ .ac`1' ::: szar4:ca:•.
• Vcr tra1.
W S r♦-
Chief Co_.c_c a c'r:�ulic L sneer
y G.
f .
GJI: 0 D ��cs
cc: :i J :a +4z rson
E
:•1 A
ulit.L i Chen
E C Y: '/CE *}rcr/P Lo_.so
',I .r r O D ? :.lA 3v..r:.l^./r. ;:ern
J :' Cr_..
n ".t .. -or
E✓
t,
,_ r.,
.
.'Z

Q.T.I.M. .1:-,: r3 t•. .t�.. ..i� L •,
To be :Amitt:: in t.!'iL'3ica'.a to:
A'crth Car.1.1..a St,atc 5.:rd of ?i;.oith
Sanitar;i Division
(i) To t.` s.".: i'.u•^.` t-•d,. _E,-._a -- •
(b) To raise ti.e 3evc1 of an ex:sti:ig pond
1, County = . .c^c^ Township Li''ostone
2. Location ir relation to 'tws or more well-knc -:n l;ndnarks:
LLkc ;o lr_n-c.. .^.- Inc"_ Creel 2000 feet urstre^m of confluence with French
Brow'. river -11r.-1rnt:roximate1v 1 74le to a roint O.d.1acent to
Hi-h;.. . U.S. 2S.
3. Penson r:a',fin^ oprlica sior as ^;liter 7ri7-ht CQnt:?n;►
4, A1Hrc.sa r'f cun-r :T "' -'ro11:
5. Pt:r iowe cd. tF.e pr':,jcct, T-'-e for t. . . '..,ter i c Ftpt;a^
�. Appre xir..t n'.;nb+ r of pers l`.s 1iviri^ within on_ mile of prc .'csed res-
ervoir cr tori
?. Arrrn{it- tc aroa t, Le cove c1 �J r.�.,,.720 acres
s
U,
Diac..o tier t'i Train at be tt,::t of dam no favi,°tL c i for ful)i er?I:ty'Ari lehe.
o, Of.scrirti.r. cf 1cvico for fluct.ating water level 1600' vide uncontrolled
spil1,4 y wi'n crf.st at nor __ vat_r elev. 2210;:.0 conc*_'ete_ye
err'.;1
10.-
Will sn..= cin-:, t:.,ncy be r'i- ll nblo frr nein tai nim pont! after ir.pcundage
so that, it ncit i rodi:c?.. mosquit.r. s? Yea
11. Date whoit is d-sired to start co,.structiott Actually started flay 1962
12. Late uhei it is :'.esiz'c't to imp:,:n•1 water Acts:111v started April 1, 11#63
In rcki n ' 'ti.i`'+ 3c.p1io.Lim, I 9:;mc t c:,m ly with tie e re;.ula icn £:ovornin
in."'oln-1-6 so .1%-Main otic. r'.ni tt:ct it will not pro.:'ico mJs! hoes an.1
•..i.:...r.cc : ..; ..':� t: 471:: [...bliC .halt;1.
Place n:1. it h, N irih Carol in., p:tto Juno 11, 1963
Carl-A ir_i fer & Light Company
; 1 � . �. :Gift•. r 't . , .
i .. •t:ULivt: Vico. fresiu'nt

•
r.�.. ••, F
_ 4CMOCRS
CHARLES R. CLOG. M. D., Pau. RAL9GM
if
L•• - .\ �. \ . :OH. R.CL:SZ:i1.M.O.. Vicc•Pats. W�wS:O N.�w�LM
•••••••••••••
� "' t ^ tT"� _ 1 Z. L. ED•.VAR;S. D.D.S. . WAsiiiw:soei
71• ' 1 L. . .t : ., «,�•ftre .w . Mn$. J. C. LATA liil.LaZana, RT t
LENOX O. CAK:R. M.D DUAn AM
ROGER W. 5.1.7RRISON. M.O. • . . AsaCvit,Ct
EARL W. CaAN. A+.D. . RAi.C,a1.
C. -IA.:AEON. PH. C. . . Li.K�: tea•.
. 1d V.. D.4CY LY. D.V.M. . . GASTow14
1 \'J R L :C't,:' L :? h.
4w
S.:CHT.TART.:.iCA..Jw:.,7 7
�:►:. i:A:C niCA::n G.6....ri
•
(?end No 13, County Bts cc:b a
Cow_iuJ
Dear Si:':
Enclosed 4s your 1:?e_mit for Impounding and. Mei nte-
±qwh+ce of T. o tided i:ith a copy of your applica-
tion attached.
Ve_r uru y your , •
Char?es M. White, Chief
insect and Rodent Control Section
Saniter-y En zincering Division
•
Enclosures
CC: Health Officer
CC: Sail Consc:nr.;.tionist
•

Pond No. 13
North Carolina State 3card of Health
S....-_ tea:f .�..,..C:C�.. _• ::��•r_:_c r.
Raieic:h, North Carolina
P=1::Ii
TOR II:PO:;;:C::; AND .;I::::::.;::C`, OF II-:POUNDED WATE
Issued to:
Name Car o?iaa Pc::e_ ILL:;'.2.; Co:.;any
hddress Z i C'„�� i. .
.:1
The construction of an imrounded water project, described in an an-.
JI:=0 12 63
lication for a permit to impound water dated , 19
having been coy_leted in accort:ance with the requirements of the N. C. ::v,„1 .
Board of Health, this permit for imnou^nin- and maintenance of impounded
water is issued tLis 72"ta day of , 196 ?
Section P. of Regulation No. 32 of the Regulations of the N. C. State
Board of Health Governing the Control of Communicable Diseases, a copy of
which is attached and forms a part of this permit, shall be observed ex-
cent provisions thcrof as may be specifically waived in writing. This
permit shall remain in force so long as the holders thereof maintain the
imnou.ded water in a condition which does not render it a menace to the
public health.
3. W. R. Norton, :i. D.
State Health Director
By _
Crarlcs Z. White, Chief
Insect and 2odcnt Control Ctction
Sanitary Engineering Divi:ion

I I ,
TENNESSEE VALLEY AUTHORITY
KNOXVILLE. TENNESSEE
tv" March 29, 1962
-4
Mr. A. J. Skaale, Vice President
Operating & Engineering Department
Carolina Power & Light Company
Raleigh, North Carolina
Dear Mr. Skeml e :
Enclosed are two copies of an Approval of Plans approved by our
Board of Directors on March 22, 1962, covering the construction of
a dam and cooling pond on Powell Creek at mile 0.6 and a water
intake at French Broad River mile 161.38.
You will note that we have shown on one of your drawings the ele-
vation of maximum known flood regulated and extreme drawdown and
the datum to which these elevations refer.
Will you please indicate your acceptance of this Approval of Plans
by signing and returning the extra copy for our files': As you will
note from Section 8, this Approval of Plans is not valid until
accepted by you.
As required by Section 3 of this Approval of Plans, will you kindly
inform this office of the date of beginning and of completion of
this project'.
Very truly yours,
TENNESSFF VALLEY AUTHORITY
°- eed A. Elliot, Chairman
U Committee for Administration
of Section 26a
_ 7/ 5- /
Enclosures 7 f. 6 •
•
C jI Ie, r
•z_ 2. yam. m et_e c•-o• t*s.
• r

TENNESSEE VALLEY AUTHORITY
KNOXVILLE. TENNESSEE
-296-Er "
t ' May 2 2,2962.
CarolinR Power & Light Company
Raleigh
North Carolina
Dear Sirs:
This confirms TVA's position concerning the provisions in Article
4 of the Approval of Plans dated March 22, 1962, for your proposed
dam and cooling pond on Powell. Creek and water intake on the
French Broad River at Mile 161.3R near Asheville, North Caroling,
as explained to your representatives by TVA's Committee for Admin-
istration of Section 26a in their discussion May 3, 1962.
In issuing approvals of plans pursuant to the provisions of section
26a of the Tennessee Valley Authority Act of 1933, as amended,
TVA's purpose under Article 4 is to acquaint the applicant with the
right of the United States and TVA to protect paramount federal
interests if and when it becomes necessary to do so in the public
interest, and with the fact that the federal interests may require
the alteration or removal of applicant's facilities at applicant's
expense under such circumstances. It is not TVA's purpose in in-
cluding this provision in the Approval of Plans to deprive the ap-
plicant of whatever rights it may have to contest the Board's find-
ings under established principles of law. Any finding by the TVA
Board of Directors will be made only on the basis of facts deter-
mined by the Board in accordance with the authority set forth in
the provisions of the Tennessee Valley Authority Act of 1933, as
amended (16 U.S.C. §§ 831-831dd), and in accordance with any other
applicable provisions of law including the Administrative Proced-
ure Act (5 U.S.C. §§ 1001-1011) . The acceptance of an approval
does not constitute any modification or waiver of the applicant's
rights afforded by these statutes.
Very truly yours,
TENNESSEE VALLEY AUTHORITY
Vii
L. J. Van Mol
General Manager
I'

APPROVAL OF PLANS
OF
CAROLINA POWER AND LIGHT COMPANY
FOR
CONSTRUCTION, MAINTENANCE, AND OPERATION OF
A DAM AND COOLING POND ON POWELL CREEK AT MTTJ 0.6
A WATEit INTAKE AT FRENCH BROAD RIVER MILE 161.3R
Pursuant to the authority vested in it by Section 26a of the
Tennessee Valley Authority Act, as amended, the Tennessee Valley
Authority hereby approves the plans submitted by
Carolina Power and Light Company
(hereinafter called "applicant"),
covering the construction, maintenance, and operation of
a dam and cooling pond and water intake
in the location and according to the plans which are attached hereto
as Exhibits A,B,C,D,E and made a part hereof. The approval is granted
upon the following terms and conditions.
1. Applicant shall obtain all such licenses and permits as may
be required by federal or state law.
2. No changes in the plans submitted by the applicant shall be
made unless and until such changes have been submitted in writing to
the Chairman of the Committee for Ac9ministration of Section 26a of TVA
and applicant has received either a revised approval or a notice in
writing from the Chairman of the Committee authorizing construction in
accordance with the revised plans and advising the applicant that formal
approval of the revised plans is unnecessary.
3. Applicant shall notify the Chairman of the Committee for
Administration of Section 26a in writing of the time of commencement
of work and shall also notify him promptly in writing of any suspen-
sion of work if for a period of more than one month, resumption of
work and its completion.
4. If any future operations of the United States or TVA, or
agents of either, require an alteration in the structure or work herein
authorized, or if the Board of Directors of TVA shall find at any time
that it has an adverse effect upon navigation, flood control or public
lands or reservations, applicant shall, upon due notice in writing from
TVA, remove or alter the structure or work, or obstructions caused
thereby, without expense to the United States or TVA, and if upon the
expiration or revocation of this Approval of Plans, the structure, fill,
excavation or other work hereby authorized shall not be completed,
applicant shall , without expense to the United States or TVA and to
such extent and in such time and manner as TVA may require, remove all
or any portion of the uncompleted structure or fill and restore to its
former condition the navigable capacity of the watercourse. No claim
shall be made against the United States or TVA on account of any such
removal or alteration.

-2-
5. This Approval of Plans does not constitute a conveyance by
TVA or by the Federal Government of any property or interest in any
property covered by or used in connection with this project nor does
it constitute a waiver on the part of the Federal Government of any
of its rights in such property.
6. This Approval of Plans does not give any property rights in
real estate or material and does not authorize any injury to private
property or invasion of private or public rights. It merely con-
stitutes a finding that the facility, if constructed at the location
specified in the plans submitted and in accordance with said plans,
would not at this time constitute an obstruction unduly affecting
navigation, flood control, or public lands or reservations.
7. In issuing this Approval of Plans, TVA makes no representa-
tions that the structures herein authorized or property used or stored
in connection therewith will not be subject to damage due to fluc-
tuations in elevations of the water surface of the river or reservoir.
By the acceptance of this approval, applicant covenants and agrees to
mAkP no claim against TVA or the United States by reason of any
such damage, and to indemnify and save harmless TVA and the United States
from any and all claims by other persons arising out of any such
damage.
8. This approval shall not become effective until accepted by
the applicant.
The Tennessee Valley Authority has accordingly caused this
Approval of Plans to be executed on this day of
Unless the construction of the project herein approved shall be
initiated before a year from the date of approval has elapsed, this
approval shall automatically expire and future construction there-
after even of the same character shall require a new approval.
TENNESSEE: VALLEY AUTHORITY
ig 6-.1"
t Accepted: Carolina Power & Light Co.
Applicant
By: i` C. n..a a---% Vice Pres. •
.040
Approv by TVA
Boa.cl of Directors
MAR 221962
ASSISTAN t SELRE AItY

•
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•7‹ Q��SI; d .
ogisr y o
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ir
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1 --, er '4.),-;*+0'. ,A T. y',4,-• Cir\
:VI 161 -t,l `; ecwRll, i t Q0 t u k}` ,;
Z`�'� Creek - ' _?*S`; O•sQ x\60 0 ,r.,1r ,{, + ._ X F
i t PT
ti �� ti G\S \L 1\ O'f'
_121 A 0 - A \
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CI
MI62 \k \ ' O \--. 4-
\ : -� ° ti
/,: Scale 1000 0 moo 2000 Feet
H i--t-f 1 -----7.3
i
_.•:,.., PROPOSED
DAM & RIVER INTAKE
NOTES. AREA PLAN
Elevotlons Ye;t:r tc rr t 1 r .. ea f- v: I
CAROLINA POWER & LIGHT
• COMPANY
A 17/,[fG0

2.0
���
L
MAX. PROBABLE FLOOD `` \-4,cOtiT A % N. :
p W ELL Cil.. ...
... ' w , `
J \ _1 1
C.' ' / * ...h........ It•.,...
lit if. .....*1
2150 1 k 1
`` a'j A
Cl*' I
4ti>
0
I'i 699.E 1 :, . ♦ i
4.CHANNEL 1'0. ,'moi' • �:�
i .
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!( '1.1'7 . I,I-arm
1 ' I-NJ-44J 1
ti . iItil,!_t.aa - . �JC G St
�_41 • 1`
t`,'�
PROPOSED
4 DAM & SPILLWAY
GENERAL PLAN i
CAROLINA POWER LIGHT
ioo o t200
.. f COMPANY
6CALE 1"=200'
_ .,
A- 170859

•
N \ /
1 205005
\c`/
• Zo...._.........-....-
\
2Q�.o 0
ria ' �oa r 3571 2�3
1 Ir." SIaOADL TIoN
111
G p,CC E 5 TD Ham{ coN S� .
�.: pR1OR
\ ` LL CR EE K
.,,r �=. _ --- - - -\ - poli - i;
-7-----------.2030
FUTURE a LVEZT5iii .
�� ...._ 235
PARKING AREA\\ `�
irk a,
ZO¢5 2040
E L 2032.5 . ; - 2050
�41 i . ' r# ‘ \ `TOE 2
• Ilk.
OF FILL
455
''771 ©� I i lOk
Q ��� wA ' �\ 2 p 6 p
�.r� a Cti5 9' \ 2p
S , O \ 1 \ \ 65
C <\0
NDN ° . • \ -A \A,
0fig- ��z_ �y�.p
1‘ \ s'\.,Q
-ii3 t 3
\ ra tr,), \
L 17 1-
tP
"V°0' PROPOSED
:i
RIVER INTAKE
GENERAL PLAN
5Q O by 100
CAROLINA POWER a LIGHT
\ SCALE l': loo' COMPANY
L._ A-170861

"'—'--- ROAD
IzJ,i ..
EL 7110.01 .r- –j /r-5'RIPRAP
cNWL 2160.o
2IGNARRY-RUN ROCK
1 21 --R �DOM FILL '_-- .. _ 30 MSN
_ P. 3
22QUARR`(-RUN FUCK—\ SJL7..
1' 11
EL Z169.0 `
ROCK UNE
SE CT A-A
CREST EL 2160.0 SYM ABOUT t i; I 1 - 60.-0 .
1-; _ D E T'Ay
E DET �`8' �T'f� - ,
SECT C-C /
r ' zo-o E
.. t % APPRoX ROCK LINE
_ -
1 of ,
k,' SECT. B -B
J" - 10010
D
xi
O10-0 loo -
I– TOP OF
Z co SHEET i 0----e - GATE FOR RESERVOIR
D D I DRAIN ATO LOWER WL TO
C M PILING i EL Z1G9.0 2150.03)
o cn ,. mina .
c O 0 cn -0 '4 ., SPILLWAY CRE. im f EL 21E0.0 .122-°= ('
7-1
Dm O r I. r off, ti-
sn - .., .
1 OUTLET PIPE 4 RIPRAP -
'+ v SHEET PILING-
o SECT EE. DE T A
o = ''' = 40 = �0 1 20-0 C�ET 'IB4

APPRUX SANK
OF R1VEK
fi
mstU1J
MAX. PROBABLE FLOOD kr PLAN
EL. 2050 . 8. I'-0
MAX. KNOWN FLOOD EL. 20 45 I
ESTIMATED REGIONAL FLOOD EL. 5000 GPM PUMP
I1= 0
.
MAX. OPERATING LEV L ..L.-
IO YEAP FLOOD LEVEL. EL 2033.04 I I _ I 4--EL 2032.5
EL. 2031-+ (,20,000 CFE'); / ji
r ri7
4.--ORIG. GRD LINE
6
" �WL ON 10f 27f G1 MIN. RATING LEVEL L u- 1 a Z
, EL 2024.15 #' TOP of CNC k ez 1 4 .
STOP-LOG O 1 -&- x
EXT LW EL 2022. 0± � ELZ02I.5 14 o 1i3
:k. TRASH RACK\f'J.4 w`' / 41w/7EL 201$.0* L,i. EIb ` I— [I, aI`' `"`RocK Y APPROX RIS{ER ' _ NF' r _,M
Kr
BOT EL 2.0 2 0.0
SECT D-D
e='Lb
COAST AND G�'CCD:T1C Si:R;'=Y '1 V29 DATUM, PROPOSED
THRicuC:: Ti :_ MM :DIUM C- T. :" I^.5 SOUTH-
.
OUTI I- RIVER INTAKE
EASTERN SUPP�=M:N T ARY ADJ'JSTM=IVT.
PLAN a SECTION
CAROLINA POWER a LIGHT
• COMPANY
A_17/10G7

Clean Water Act§316(b)Compliance Submittal
Asheville Combined Cycle Station
Appendix B
Asheville Combined Cycle Station
§122.21 (r)(2) — (8), (14) Submittal
Requirement Checklist for a New
Unit at an Existing Facility

Clean Water Act§316(b)Compliance Submittal L�']
Asheville Combined Cycle Station
Citation
Title 40 CFR Requirement Provided in
122.21(r) Report?
m
o (2)(i) Narrative description and scaled drawings of source Yes
Ta
waterbody
U
T
Identification and characterization of the source waterbody's Yes; note that no
hydrological and geomorphological features, as well as the physical studies
(2)(ii) methods used to conduct any physical studies to determine were conducted to
intake's area of influence within the waterbody and the determine the area
results of such studies of influence
0
(2)(iii) Locational maps Yes
Narrative description of the configuration of each CWIS and
(3)(i) Yes
where it is located in the waterbody and in the water columnas
c
zr,• o (3)(ii) Latitude and Longitude of CWIS Yes
0) 3 (3)(iii) Narrative description of the operation of each CWIS Yes
0
o in
v (3)(iv) Flow distribution and water balance diagram Yes
(3)(v) Engineering drawing of CWIS Yes
A list of the data supplied inparagraphs r 4 ii through(vi) Yes, but not
pp ( )( )( ) g applicable because
(4)(i) of this section that are not available and efforts made to all data are
identify sources of the data available
0
C
O —
:Z A list of species(or relevant taxa)for all life stages and their
N `° (4)(ii) Yes
relative abundance in the vicinity of CWIS
� rn
U c
N
oo 4 Identification of the species and life stages that would be
v a> ( )(iii) Yes
most susceptible to impingement and entrainment
0
U U
o m Identification and evaluation of the primary period of
m o (4)(iv) reproduction, larval recruitment, and period of peak Yes
a)c abundance for relevant taxa
Cl) o
m m Data representative of the seasonal and daily activities of
a) CO Yes
(4)(v) Ybiological organisms in the vicinity of CWIS
aa)• m Identification of all threatened, endangered, and other
eo CCa (4)(vi) protected species that might be susceptible to impingement Yes
cn and entrainment at cooling water intake structures
Documentation of any public participation or consultation No consultation
(4)(vii) with Federal or State agencies undertaken in development of required
the plan

Clean Water Act§316(b)Compliance Submittal FIN
Asheville Combined Cycle Station
Citation
Title 40 CFR Requirement Provided in
122.21(r) Report?
(4)(viii) Methods and QA procedures for any field efforts Yes
In the case of the owner or operator of an existing facility or Yes, noted in report
new unit at an existing facility,the Source Water Baseline that(i)through (xii)
(4)(ix) must be addressed
Biological Characterization Data is the information included
in (i)through(xii) in this submittal
package
Identification of protective measures and stabilization
activities that have been implemented, and a description of
(4)(x) Yes
how these measures and activities affected the baseline
water condition in the vicinity of CWIS
Yes but not
List of fragile species as defined at 40 CFR 125.92(m)at the required because
(4)(xi) facility new unit at an
existing facility
Information submitted to obtain Incidental take exemption or
authorization for its cooling water intake structure(s)from the Yes, but not
(4)(xii) U.S. Fish and Wildlife Service or the National Marine applicable
Fisheries Service
Narrative description of the operation of the cooling water
(5)(i) Yes
system and its relationship to CWIS
Number of days of the year the cooling water system is in Yes, anticipated
(5)(i) operation and seasonal changes in the operation of the seasonal
osystem operations
E
(5)(i) Proportion of the design intake flow that is used in the Yes
system
is
Proportion of design intake flow for contact cooling, non-
(5)0) Yes
contact cooling, and process uses
0
U Distribution of water reuse to include cooling water reused as
(5)(i) process water, process water reused for cooling, and the use NA
of gray water for cooling
Description of reductions in total water withdrawals including
(5)(i) cooling water intake flow reductions already achieved Yes
through minimized process water withdrawals

Clean Water Act§316(b)Compliance Submittal rLYZ
Asheville Combined Cycle Station
Citation
Provided in
Title 40 CFR Requirement
122.21(r) Report?
Description of any cooling water that is used in a
(5)(i) manufacturing process either before or after it is used for NA
cooling, including other recycled process water flows
(5)(i) Proportion of the source waterbody withdrawn(on a monthly Yes
basis)
Design and engineering calculations prepared by a qualified
(5)(ii) professional and supporting data to support the description Yes
required by paragraph(r)(5)(i)of this section
Description of existing impingement and entrainment
(5)(iii) technologies or operational measures and a summary of NA
their performance
Identification of the chosen compliance method for the entire CWIS or Yes
each CWIS at its facility
Impingement Technology Performance Optimization Study
for Modified Travelling Screen
_c •O
8 F Two years of biological data collection
c o
Q m 8 (6)(i)
• a)
U T v
o ami Demonstration of Operation that has been optimized to
• o minimize impingement mortality
U
0
m 06 None Available
• E o Complete description of the modified traveling screens and
associated equipment
E a
U a Impingement Technology Performance Optimization Study
co m for Systems of Technologies as BTA for Impingement
Mortality
(6)(ii)
Minimum of two years of biological data measuring the
reduction in impingement mortality achieved by the system

Clean Water Act§316(b)Compliance Submittal I-)
Asheville Combined Cycle Station J
Citation
Title 40 CFR Requirement Provided in
122.21(r) Report?
oami Site-specific studies addressing technology efficacy,through
E o > (7)(i) plant entrainment survival, and other impingement and None Available
Zs
m ; entrainment mortality studies
a> °
a a .. cm
c i5 a) .S
' m O o Studies conducted at other locations including an
E C (7)(ii) None Available
o explanation of how they relevant and representative
o U
Lu ((n o
W
1) Studies older than 10 years must include an explanation of
C as (7)(iii) why the data are still relevant and representative None Available
Description of individual unit age, utilization for previous 5
(8)(i) year, major upgrades in last 15 years Yes, where relevant
U)
Descriptions of completed, approved, or scheduled uprates
Y (8)(ii) and Nuclear Regulatory Commission relicensing status of Yes,where relevant
1 co each unit at nuclear facilities
1 Toc
O
.i Other cooling water uses and plans or schedules for
a (8)(ui) decommissioning or replacing units Yes
0
8 ,v For all manufacturing facilities, descriptions of current and
( )( ) future production schedules NA
Descriptions of plans or schedules for any new units planned
(8)(v) within the next 5 years Yes
Applicant must identify the chosen compliance method for Yes, but will not
the new unit. In addition,the owner or operator that selects need to comply with
c BTA standards for new units at 40 CFR 125.94(e)(2)as its
route to compliance must submit information to demonstrate Entrainment
Characterization
Z (14) entrainment reductions equivalent to 90 percent or greater of Study because
dthe reduction that could be achieved through compliance facility does not
with 40 CFR 125.94(e)(1). The demonstration must include withdrawal greater
the Entrainment Characterization Study at paragraph(r)(9)of than 125 MGD AIF
this section

Appendix C
Asheville Combined Cycle Station
(ACC), Engineering Calculations for
Through-Screen Velocity

Asheville Combined Cycle Station(ACC)
Duke Energy Carolinas
Through-Screen Velocity Calculation-Lake Julian Cooling Water Intake Structure
Prepared by HDR
Originator: Mark Bailey,EIT 8-Sep-15
Reviewer:Radhika de Silva,PhD,PE 8-Jan-16
Revision No. Performed by Description of Revision
0 RDS 8/7/17-updated pump ratings
1 SRL 5/24/18-incorporated 0.5 inch mesh retrofit
2 SRL 7/27/18-incorporated 0.25 inch mesh and
3 SRL 8/15/18-incorporated bar rack data
Duke Energy-Asheville Combined Cycle Station(ACC) 1/6 Through-Screen Velocity 9/11/2018

Asheville Combined Cycle Station(ACC)
Through-Screen Velocity Calculation-Lake Julian Cooling Water Intake Structure
Calculation Purpose:
1. Calculate the through-screen velocity at Asheville Combined Cycle Stations's cooling water intake structure(CWIS)on Lake Julian when
the intake pumps operate at full capacity under normal and low water level conditions.
Calculation Objectives:
1. Identify the screen physical parameters and design intake flow rates.
2. Calculate the fraction of the screen open for water flow.
3. Calculate the typical through-screen velocity under typical water elevation/flow conditions and design intake rate.
System Description:
The Asheville Combined Cycle Station(ACC)is an electric power generating facility that will consist of two combined-cycle power blocks with a
summer/winter net electrical generating capacity of 250 MW/280 MW.The existing CWIS on Lake Julian will be repurposed to provide make-
up cooling water and service water from Lake Julian for both units.Each unit will have two dedicated intake bays and two circulating pumps,
one of which will be for redundancy,for a total of four intake bays and 4 circulating water pumps per unit..Lake Julian,located in Buncombe
County,North Carolina,was created to serve as part of the cooling system for the existing Asheville Steam Electric Plant(Asheville Plant)by
impounding Powell's Creek,a tributary of the French Broad River.The existing Asheville Plant also has a make-up water intake structure
(MWIS)located on the French Broad River which will continue to be used to replenish Lake Julian water levels during low water conditions.Thi
repurposed CWIS on Lake Julian will consist of the existing 1-inch hexagonal mesh screens(to prevent trash and debris from contacting the
pumps or passing through into the station),bar racks,and new 0.25-inch mesh screens to be retrofitted at the CWIS.This evaluation will
present the through-screen velocity at the CWIS under normal and low(design)water level conditions in Lake Julian under proposed
operations of the ACC.
Duke Energy-Asheville Combined Cycle Station(ACC) 2/6 Through-Screen Velocity 9/11/2018

Asheville Combined Cycle Station(ACC)
Through-Screen Velocity Calculation-Lake Julian Cooling Water Intake Structure
Calculation Methodology:
The through-screen velocity will be calculated using the continuity equation as follows:
Formula 7 Ven=Q/EOA
where:
Q=flow rate in gallons per minute(gpm)
V=through-screen velocity in feet per second(fps)
WD=wetted screen depth in feet(ft)
OA=proportion of screen open area to total screen area
TW= nominal screen basket width in ft
Formula2 OA=(W*L)/((W+D)*(L+d))
where:
d=horizontal(shute)wire diameter in inches(in)
D=vertical(warp)wire diameter(in)
W=width of mesh opening(in)
L=vertical length of mesh opening(in)
Formula 3 EOA=PC*OA
Formula4 Ven=Q/(WD*EOA*TW*K)
where:
EOA= proportion of effective open area
PC= screen percent clean(%)
K= Conversion factor from gallons per minute to cubic feet per second,449
Ven=effective through-screen velocity(fps)
Duke Energy-Asheville Combined Cycle Station(ACC) 3/6 Through-Screen Velocity 9/11/2018

Asheville Combined Cycle Station(ACC)
Through-Screen Velocity Calculation-Lake Julian Cooling Water Intake Structure
Design Inputs:
Lake Julian CWIS
Unit 1 Unit 2
Number of screens 2 2 Ref.5;Ref.6
Elevation at bottom of intake 2,144.0 2,144.0 ft Ref 5;Ref.6
Normal water surface elevation 2,160.0 2,160.0 ft Ref.5;Ref.6
Low water surface elevation(design) 2,158.0 2,158.0 ft Ref.5;Ref.6
Screen width 9.17 9.17 ft Ref.5;Ref.6
Hexagonal mesh size(L) 1.0 1.0 in As.7
Hexagonal mesh size(W) 1.0 1.0 in As.7
Hexagonal mesh vertical wire gauge number 19 19 gauge As.7
Hexagonal mesh vertical wire diameter 0.044 0.044 in As.7
Hexagonal mesh horizontal wire gauge number 19 19 gauge As.7
Hexagonal mesh horizontal wire diameter 0.044 0.044 in As.7
Bar Rack Width of Spaces(bs) 2.5 2.5 in Ref.2
Bar Width(bw,) 0.375 0.375 in Ref.2
0.25-inch mesh size(L) 0.25 0.25 in Ref.8;Ref.9
0.25-inch mesh size(W) 0.25 0.25 in Ref.8;Ref.9
0.25-inch mesh vertical wire gauge number 16 16 gauge As.8;Ref.8
0.25-inch mesh vertical wire diameter 0.063 0.063 in As.8;Ref.8
0.25-inch mesh horizontal wire gauge number 16 16 gauge As.8;Ref.8
0.25-inch mesh horizontal wire diameter 0.063 0.063 in As.8;Ref.8
Screen percent clogged 0% 0%
Cooling Water Pump 1 Rating 1,800 1,800 gpm Ref 7
Cooling Water Pump 2 Rating 1,800 1,800 gpm Ref.7
Duke Energy-Asheville Combined Cycle Station(ACC) 4/6 Through-Screen Velocity 9/11/2018

Asheville Combined Cycle Station(ACC)
Through-Screen Velocity Calculation-Lake Julian Cooling Water Intake Structure
Assumptions:
1 Water elevation inside screenhouse is same as in the source waterbody immediately outside the bar racks.
2 Intakes have not been modified since dates of references used.
3 All screens function similarly.
4 Flow rates are pump design maximum and are most conservative.
5 The constant in Formulae 1 and 4 include units conversion from gpm to cfs.
6 The screen parameters found in the drawings remain accurate.
7 The hexagonal mesh screens at Asheville are approximately 1-inch in diameter and 19 gauge steel wire based on visual
observations.
8 The proposed 0.25-inch mesh screens have a wire diameter of approximately 0.063 inches(16 gauge)based on physical
measurement by vendor.
9 The bar racks have a bar spacing of 3 inches on-center,and a bar width of 0.375 inches(Ref.2)
References
[1]Lide,D.R.,CRC Handbook of Chemistry and Physics(Ed.72),Chemical Rubber Publishing Co.,USA, 1991-1992.
[2]Ebasco Services Inc.Skyland Steam Electric Plant Intake Steel and Screens,Drawing G-171048,Rev.3 Dated 5/28/1963.
[3]Duke Energy (January,2015).Clean Water Act§316(b)Strategic Plan-Asheville Steam Station.
[4]B.L.Montague Co.Inc(March, 1963).River Intake Screens.Drawing 43363-155.
[5]Brown&Root,Inc.Asheville Steam Electric Plant,Concrete Intake Structure Plan @ Top of Slab,Sections and Details,Drawing
C-219-D,As-built 5/15/1972.
[6]Ebasco Services,Inc.Skyland Steam Electric Plant Circulating Water System Intake,Drawing G-170903,Rev.4 Dated
1/24/1963.
[7]HDR,Ziegler Communication 12/29/2015.
[8]Beaudrey.Correspondence to Duke Energy.Dated 6/5/2018.
[9]Beaudrey.Asheville Static Screen General Assembly.Drawing E117624.7/12/2018.
Duke Energy-Asheville Combined Cycle Station(ACC) 5/6 Through-Screen Velocity 9/11/2018

Asheville Combined Cycle Station(ACC)
Through-Screen Velocity Calculation-Lake Julian Cooling Water Intake Structure
Calculation Summary:
Unit 1 Unit 2
The estimated hexagonal mesh through-screen velocity at normal water level: 0.034 0.034 fps
The estimated hexagonal mesh through-screen velocity at low(design)water level: 0.039_ 0.039 fps
The estimated 0.25-inch mesh through-screen velocity at normal water level: 0.043 0.043 fps
The estimated 0.25-inch mesh through-screen velocity at low(design)water level: 0.049 0.049 fps
Calculations:
1. Screen Physical Parameters and Design Intake Flow Rate
Given: Unit 1 Unit 2
Qrer„ 3,600 3,600 gpm
Q= 1,800 1,800 gpm per screen
Dhex 0.044 0.044 in
dhex 0.044 0.044 in
Loo. 1 1 in
Whex- 1 1 in
Do25-m= 0.063 0.063 in
d025-in.= 0.063 0.063 in
Lo25-in= 0.250 0.250 in
W0 25-in= 0.250 0.250 in
Dbar= 0.38 0.38 in
dbar= 0.0 0.0 in
Lear= 2.5 2.5 in
Wbar= 2.5 2.5 in
WC)normal 16.0 16.0 ft
WDiow 14.0 14.0 ft
K= 448.8 448.8
TW= 9.2 9.2 ft
PC= 100% 100%
2. Proportion of Effective Open Screen Area to Total Screen Area
Formulae Used:
Formulae 3 and 4
Given:
Screen parameters as above
Calculate:
Screen Unit 1 Unit 2
OA=(W*L)/((W+D)*(L+d))= 0.92 0.92 for hexagonal mesh
OA=(W*L)/((W+D)*(L+d))= 0.87 0.87 for bar rack
EOA=PC*OA= 0.80 0.80 for hexagonal mesh
OA=(W*L)/((W+D)*(L+d))= 0.64 0.64 for 0.25-inch mesh
EOA=PC*OA= 0.64 0.64 for 0.25-inch mesh
3. Through-screen Velocity
Formulae Used:
Formula 4
Given:
Screen parameters as above and calculated screen open area proportior
Calculate:
Unit 1 Unit 2
Vel=Q/(WD*EOA*TW*K) hexagonal mesh at normal water level 0.034 0.034 fps
Ven=Q/(WD*EOA*TW*K) hexagonal mesh at low(design)water level 0.039 0.039 fps
Vey=Q I(WD*EOA*TW*K) 0.25-inch mesh at normal water level 0.043 0.043 fps
Vee=Q/(WD*EOA*TW*K) 0.25-inch mesh at low(design)water level 0.049 0.049 fps
Duke Energy-Asheville Combined Cycle Station(ACC) 6/6 Through-Screen Velocity 9/11/2018

Appendix D
Asheville Combined Cycle Station
(ACC), Pertinent Design Drawings

•
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NIun 11111111111111 ' NT ONL IPA SECTIONS DETAILS C-219 O

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NOTE: ,111
SECTtON D-D - E.V-I'-o"
THESE PANELS TO BE POURED
AFTER 54"¢PIPE HAS BEEN *GALE:v..1Ld' I
11 1
SET IN PLACE.
10
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No. BATE REVISION IT REL APP. SECTIONS It DETAILS C-219-D
a t.'I a-

G-170903 t TQAV SCREEN GUIDES BELALY_STEEL PIPE
STOP LOG:GUIDES
A - ?(ITN".6LN0 FLAKE F.21-4 LC)
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F ,C ''WR HANDRAIL SEE G-171048 ,.' -2,6 4 � jai Ej " "
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1•PRENDLDED JOINT FILLER 40 54 FI- F
61 .4 STALV.STEEI i 85L10TPE5f'Ot RYPOCHLORRE 3.0 ZLRN ZB500 OR®IAAI_ 2 REO'D
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OI =i �.. p .COAT.ALL EXPOSED STEEL FOR FUTURE _
_ . EXTENSION WITH BITUNASTIC(LADDER RUNGS NOT
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I LIST OF DRAWINGS ( A-110744 J
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TOP WEATHERED -I _[_..._ - • -• -'HO -• - I J-4• 9'-S LW.PUMP-(C HINTAKE STEEL 6 SWHEELERA_S, 9-111048
.GNEISS- GWS.-INTAKE-MAS 5H2 ) -110500
! C-W5-INTAKE-REINF 5E1
G-110904
._ _-_ 4`O ;I p'-0 r CIRCULATING WATER PPE(A-S) G-170975
1 =. C.W.E.BLOCKS IA,IB 5 9-111046
LIJ/ V V LADING 6-170919
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FOR DIFFERENTIAL SEDT $-$ del,-O
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DETAIL A E 1'-D EGVIgFAn�HIS Wu7 1Cw`"s nABCp gtRVICEB INCORPORATIEp New YORK
1=1'O " / 5�
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A STOP LOG F,COARSE SCREEN 4TRAV SCREEN �4,FINE SCREEN K[OFSC Z-L MAK.LTRS,MINgj(&E PEj -
N
woes GUIDES I GUIDE9 GUIDES CW PUMPS I lO CWEI•CO IT FOR.HINGED Cov ERSV 5.EEL c A
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CODE PLAN M MM
DE COANDS N OE DOSSIER N.D ORDRE
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