NC0004987_Initial Certification Statement Discharge Bottom Ash Transport Water_20211013

Julie K.Turner,Vice President
•k DUKE Carolinas Coal Generation
410 S.Wilmington Street
ENERGY Raleigh, NC 27601
o:919.546.6227
[e-mail]
Sergei Chernikov,Ph.D.
North Carolina Department of Environmental Quality
Division of Water Resources
Industrial NPDES Permitting Unit
1617 Mail Service Center Raleigh,NC 27699-1617 RECEIVED
Reference: Duke Energy Progress,LLC O C T 13 2021
Duke Energy Carolinas,LLC
Initial Certification-40 CFR§423.19(c) NCDEQIDWRINPDES
Dear Dr. Chernikov:
On November 3, 2015,the U.S. Environmental Protection Agency (EPA) issued the Federal
Steam Electric Power Generating Effluent Limit Guidelines and Standards (ELG Rule). The
2015 rule addressed discharges from a number of sources, including bottom ash transport water.
On October 13, 2020,the rule was reconsidered by EPA and revisions were effective as of
December 14, 2020.
The final rule revised limitations and standards for bottom ash transport water. Specifically,the
final rule established Best Available Technology Economically Achievable(BAT) as a high
recycle rate system with a site-specific volumetric purge which cannot exceed 10 percent of the
bottom ash transport water system's volume on a 30-day rolling average. The enclosed
documents provide the initial certification statement of the bottom ash system capacity as
required by 40 CFR §423.19(c).
Affected facilities include the following:
• Allen Steam Station—Permit No.NC0004979
• Belews Creek Steam Station—Permit No.NC0024406
• Marshall Steam Station—Permit No.NC0004987
• Roxboro Steam Electric Plant—Permit No.NC0003425
In addition to providing the initial certification,this correspondence provides notification under
NPDES Permit Standard Condition II.E.8: "Where the Permittee becomes aware that it failed to
submit any relevant facts in a permit application, or submitted incorrect information in a permit
application or in any report to the Director, it shall promptly submit such facts or information [40
CFR 122.41(1)(8))."
Specifically, during the course of 2021,the referenced NPDES permits were modified to include
updated language based on the October 13, 2020 revisions. Preliminary information on the
capacity of the bottom ash transport systems was used to develop the applications and

Sergei Chernikov,Ph.D.
Initial Certification
Page 2
subsequent permit revisions. As detailed in the attached documents,these values have changed
permits are modified,this information will be corrected. In the interim,As we have
stations to ensure that theywill comply with the updated values in
worked with our generating p y p
lieu of those shown in the permit.
Closing
If you have any questions or concerns about the information provided in this submittal,please do
not hesitate to reach out to Ms. Cynthia Winston, PE at(919) 210-1931 or
[e-mail].
I certify, under penalty of law, that this document and all attachments were prepared
under my direction or supervision in accordance with a system designed to assure that
qualified personnel properly gather and evaluate the information submitted. Based on my
inquiry of the person or persons who manage the system, or those persons directly
responsible for gathering the information, the information submitted is, to the best of my
knowledge and belief true, accurate, and complete. I am aware that there are significant
penalties for submitting false information, including the possibility of fines and
imprisonment for knowing violations.
Sincerel ,
Julie K. urner
Vice President, Carolinas Coal Generation
Enclosures
cc: Scott LaSala, Marshall
Don Safrit,NCRH
Robert Howard, Roxboro
Lori Tollie, Lewisville
Randy Gantt,Allen
Elizabeth Glenn, Energy Center
Brenda Johnson, Belews Creek
Shannon Langley,NCRH
Derek Henderson,NCRH
Cynthia Winston,NCRH

BURNS &MSDONNELL..
Marshall Steam Station
Initial Certification Statement to
Discharge Bottom Ash Transport Water
e& DUKE
lry
RECEIVED
ENERGY®
OCT 13 2021 Duke Energy
NCDEQIDWRINPDES
Marshall Steam Station
Project No. 133406
Revision 0
October 8, 2021

Marshall Steam Station
Initial Certification Statement to
Discharge Bottom Ash Transport
Water
Prepared for
Duke Energy
Marshall Steam Station
Project No. 133406
Catawba County, North Carolina
Revision 0
October 8, 2021
Prepared by
Burns & McDonnell Consultants, Inc.
Kansas City, Missouri

INDEX AND CERTIFICATION
Duke Energy
Marshall Steam Station
Initial Certification Statement to Discharge Bottom Ash Transport Water
Report Index
Chapter Number
Number Chapter Title of Pages
1.0 Executive Summary 2
2.0 High Recycle System Description 8
Appendix A Bottom Ash Equipment System Volumes and Water Balance 12
Appendix B Bottom Ash Piping Detailed Build-Up 2
Certification
I hereby certify,as a Professional Engineer in the State of North Carolina,that the information in this
document was assembled under my direct personal charge. This report is not intended or represented to be
suitable for reuse by Duke Energy or others without specific verification or adaptation by the Engineer. I
hereby certify that this initial certification was prepared for the Duke Energy Marshall Steam Station in
accordance with standard engineering practices and based on my knowledge, information,and belief,the
content of this Certification when developed in October 2021 is true and meets the requirements of 40
CFR§ 423.191. I hereby certify that I am familiar with the ELG regulation requirements and Duke
Energy's Marshall Steam Station.
P
FES /O,i, �/
9j 4949
Dave Guinta, P.E.
` ;/ 360 - (North Carolina License No. PE045360)
10/08/2021
O,F Date: 10/8/2021

Owner's Certification of Compliance - 40 CFR 122.22
Pursuant to 40 CFR 122.22, I certify under penalty of law that this document and all attachments were
prepared under my direction or supervision in accordance with a system designed to assure that qualified
personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the information, the
information submitted is,to the best of my knowledge and belief,true, accurate,and complete. I am aware
that there are significant penalties for submitting false information, including the possibility of fine and
imprisonment for knowing violations.
On behalf of Duke Energy:
ie K. Turner
(Printed Name)
Vice President, Carolinas Coal Generation
(Title)
October 12,2021
(Date)

Marshall Steam Station
Certification Letter Table of Contents
TABLE OF CONTENTS
Page No.
1.0 EXECUTIVE SUMMARY 1-1
2.0 HIGH RECYCLE SYSTEM DESCRIPTION 2-1
2.1 Bottom Ash System Description 2-1
2.2 List of All Potential Discharges under 40 CFR § 423.13(k)(2)(i)(A)(1)—(4) 2-3
2.2.1 Closed loop bottom ash chemistry considerations 2-5
2.3 Wastewater treatment systems at Marshall 2-7
APPENDIX A— BOTTOM ASH EQUIPMENT SYSTEM VOLUMES AND WATER
BALANCE
APPENDIX B — BOTTOM ASH PIPING DETAILED BUILD-UP
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Marshall Steam Station
Certification Letter Table of Contents
LIST OF TABLES
Page No.
Table 2-1: Marshall's Active Wetted Volume Summary 2-3
Table 2-2: Marshall's Purge Discharges 2-4
Table 2-3: Key to Scaling Indexes 2-5
Table 2-4: Scaling Indexes for Purge Calculations 2-6
Table 2-5: Marshall's Wastewater Treatment Systems 2-8
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Marshall Steam Station
Certification Letter List of Abbreviations
LIST OF ABBREVIATIONS
Abbreviation Term/Phrase/Name
BA bottom ash
BAT Best Available Technology Economically Achievable
BMcD Burns&McDonnell
Marshall Marshall Steam Station
CCR Coal Combustion Residual
CFR Code of Federal Regulations
Duke Duke Energy
ELG Rule Effluent Limitations Guidelines and Standards for the Steam Electric
Power Generating Point Source Category
EPA U.S.Environmental Protection Agency
FGD flue gas desulfurization
gpm gallons per minute
LRBS Lined Retention Basin System
SFC Submerged Flight Conveyor
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Marshall Steam Station
Certification Letter Executive Summary
1.0 EXECUTIVE SUMMARY
On November 3,2015,the U.S.Environmental Protection Agency(EPA)issued the federal Steam Electric
Power Generating Effluent Limit Guidelines and Standards (ELG); see 80 FR 67838. The 2015 rule
addressed discharges from flue gas desulfurization(FGD)wastewater, fly ash transport water, bottom ash
(BA) transport water, flue gas mercury control wastewater, gasification wastewater, combustion residual
leachate,and non-chemical metal cleaning wastes.
The 2015 rule was reconsidered by EPA, with updates finalized on October 13, 2020 (see 85 FR 64650),
and effective as of December 14, 2020. The final rule revises limitations and standard for two of the waste
streams addressed in the 2015 rule: BA transport water and FGD wastewater. For BA transport water,the
final rule establishes Best Available Technology Economically Achievable (BAT) as a high recycle rate
system with a site-specific volumetric purge (defined in the final rule as BA purge water) which cannot
exceed 10 percent of the BA transport water system's volume where the purge volume and associated
effluent limitations are established by the permitting authority. EPA selected a 95th percentile of total
system volume as representative of a 30-day rolling average, which results in a limitation of 10 percent of
total system volume and requires the NPDES permitting authority to develop a site-specific purge
percentage that is capped at 10 percent. EPA recognizes that some plants may need to improve their
equipment, process controls, and/or operations to consistently meet the limitations included in this final
rule; however,this is consistent with the Clean Water Act, which requires that BAT discharge limitations
and standards reflect the best available technology economically achievable.
This document serves as the initial certification statement required by 40 CFR § 423.19(c). On behalf of
Duke Energy(Duke),this initial certification seeks to discharge BA transport water pursuant to 40 Code of
Federal Regulations (CFR) § 423.13(k)(2)(i) at the Marshall Steam Station (Marshall), located in Terrell,
Catawba County,North Carolina.As required by the ELG Rule,this plan includes the following:
A. A statement that the professional engineer is a licensed professional engineer. (refer to Index&
Certification page)
B. A statement that the professional engineer is familiar with the regulation requirements. (refer to
Index&Certification page)
C. A statement that the professional engineer is familiar with the facility. (refer to Index&
Certification page)
D. The primary active wetted bottom ash system volume in 40 CFR§ 423.11(aa). (refer to table 2-1)
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Marshall Steam Station
Certification Letter Executive Summary
E. Material assumptions, information,and calculations used by the certifying professional engineer
to determine the primary active wetted bottom ash system volume.(Refer to Appendices A and
B)
F. A list of all potential discharges under 40 CFR§ 423.13(k)(2)(i)(A)(1)through(4),the expected
volume of each discharge,and the expected frequency of each discharge. (refer to Table 2-2)
G. Material assumptions, information,and calculations used by the certifying professional engineer
to determine the expected volume and frequency of each discharge, including a narrative
discussion of why such water cannot be managed within the system and must be discharged.
(refer to Table 2-2)
H. A list of all wastewater treatment systems at the facility currently,or otherwise required by a date
certain under this section. (refer to Table 2-5 and Section 2.4)
I. A narrative discussion of each treatment system including the system type,design capacity,and
current or expected operation. (refer to Table 2-5 and Section 2.4)
Marshall consists of four operating coal-fired units: Unit 1 is a 400 MW pulverized coal fired unit built in
1965,Unit 2 is a 400 MW pulverized coal fired unit built in 1966,Unit 3 is a 700 MW pulverized coal fired
unit built in 1969, and Unit 4 is a 700 MW pulverized coal fired unit built in 1970. These units were
modified in 2020 and are now able to operate with either coal or natural gas as their fuel supply.Marshall's
existing BAT high recycle system utilizes wet sluicing to transport bottom ash(when the units operate on
coal) from each operating unit to a remote dewatering conveyor system to dewater the bottom ash. The
system can be operated as a closed loop or as a high recycle rate system. Duke is requesting to purge up
to 10 percent of the total system volume (up to 95,000 gallons per day) related to system water
chemistry as allowed under 40 CFR§423.13(k)(2)(i).
Duke Energy—Marshall Steam Station 1-2 Burns&McDonnell
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Marshall Steam Station
Certification Letter High Recycle System Description
2.0 HIGH RECYCLE SYSTEM DESCRIPTION
As required by 40 CFR§423.19(c)(3)(D)through(I),the following is a description of the existing bottom
ash system at Marshall, including the assumptions, information, and calculations used by the certifying
professional engineer to determine the primary active wetted bottom ash system volume and the expected
volume and frequency of each discharge. This section also includes a description of the wastewater
treatment systems at Marshall.
2.1 Bottom Ash System Description
Units 1, 2, 3 &4 each have one bottom ash hopper.After combustion, ash that accumulates in the bottom
of the boiler(referred to as bottom ash) is captured in these bottom ash hoppers located directly beneath
the boilers. Bottom ash is then crushed into small pieces by the crushers in each hopper before being
sluiced by jet pumps to a system of remote dewatering conveyors. Each unit has a dedicated sluicing
pipeline to convey bottom ash to the three remote dewatering conveyors.
Bottom ash particles are settled in the operating conveyors with the assistance of lamella assemblies. The
settled ash particles are then dragged out of the wetted portion of the conveyors and emptied into
dewatering bunkers before being transported via truck to the CCR landfill for disposal. Transport water
from the dewatering process overflows the operating conveyors into a single surge tank before being
pumped back to the bottom ash system for recycling. The water from the surge tank is recycled for use as
sluicing water for each bottom ash hopper, as well as to supply water to each hoppers seal trough and
cooling water system.
The hopper cooling and seal trough water supplied to each bottom ash hopper overflows into a hopper
overflow tank,one dedicated to each hopper. This water collected in the overflow tanks is then conveyed
to the operating remote dewatering conveyors.
A Submerged Flight Conveyor(SFC) Sump is located near the remote dewatering conveyors which
collects drainage from the bottom ash dewatering bunkers,and other drains and overflows from the
bottom ash dewatering system. This water is then returned to the three remote dewatering conveyors.
Major equipment for Marshall's bottom ash system consists of four boiler hoppers,three dewatering
conveyors,three process overflow troughs, one surge tank,four bottom ash hopper overflow tanks,and
the SFC sump. The sluice supply piping and the water return piping has been included in the system
calculation as well,while the miscellaneous interconnecting piping throughout the system has been
excluded.
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Certification Letter High Recycle System Description
A summary of pertinent system data is provided in Table 2-1. A site plan can be found below on Figure
1.
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Figure 1 -Marshall Steam Station Plan Drawing
Duke Energy—Marshall Steam Station 2-2 Burns&McDonnell
October 2021 Rev 0

r
Marshall Steam Station
Certification Letter High Recycle System Description
Table 2-1: Marshall's Active Wetted Volume Summary
Description Qty Qty Total
Component Cumulative
Units Component
Volume Volume System Volume
(Gal) (Gal) (Gal)
Unit 1 Bottom Ash Hopper 1 ea 21,692 21,692 21,692
Unit 2 Bottom Ash Hopper 1 ea 21,692 21,692 43,384
Unit 3 Bottom Ash Hoppers 1 ea 36,652 36,652 80,036
Unit 4 Bottom Ash Hoppers 1 ea 36,652 36,652 116,688
Unit 1 Bottom Ash Hopper 1 ea 2,003 2,003 118,691
Overflow Tank
Unit 2 Bottom Ash Hopper 1 ea 2,003 2,003 120,694
Overflow Tank
Unit 3 Bottom Ash Hopper 1 ea 2,003 2,003 122,698
Overflow Tanks
Unit 4 Bottom Ash Hopper 1 ea 2,003 2,003 124,701
Overflow Tanks
Dewatering Conveyors 3 ea 147,130 441,389 566,089
Process Overflow Trough 3 ea 5,028 15,085 581,174
SFC Sump 1 ea 7,719 7,719 588,894
Surge Tank 1 ea 221,759 221,759 810,653
Piping* 1 lot 138,993 138,993 949,646
Total Nominal Volume 949,650
10% gallon/day 94,965
10% gallon/hour 3,957
10% gallon/min 66
*For a detailed breakdown of the piping quantity see Appendix B.
2.2 List of All Potential Discharges under 40 CFR § 423.13(k)(2)(i)(A)(1) - (4)
Table 2-2 summarizes the discharges from the bottom ash system at Marshall:
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Marshall Steam Station
Certification Letter High Recycle System Description
Table 2-2: Marshall's Purge Discharges
Discharge Average
Stream Flow Description Frequency
(gpm)"
Following significant storm events.
The system was designed to manage a
25-year/24-hour storm event
Precipitation-related inflows equivalent to 6"of rainfall atop open
generated from storm events top tanks and sump,or 25,100 gallons.
exceeding a 10-year storm event of This volume would replace up to 17.4
(A)(1) 24-hour or longer duration(e.g.,30- gpm of makeup water during the once
Stormwater NA day storm event)and cannot be in 25-year event.In the event of a
managed by installed spares, large enough storm,or repeated
redundancies,maintenance tanks, events,excess water would be
and other secondary bottom ash managed within the maintenance tank
system equipment and spares to the extent possible,but
ultimately some water would have to
be removed to prevent overtopping.
(A)(2) Regular inflows from wastestreams Additional wastestreams are not
other than bottom ash transport comingled with the bottom ash system
Process NA water that exceed the ability of the at Marshall and,therefore,will not
Wastestreams bottom ash system to accept require discharge.
recycled water
Makeup water is very soft and very
corrosive.Water within the bottom
To maintain system water ash system also has strong corrosive
chemistry where installed tendencies that increase over time
(A)(3) equipment at the facility is unable when the system is operating. Sulfate
Water to manage pH,corrosive concentrations are about 117 times
66 substances, substances or higher than the lake water that feeds
Chemistry conditions causing scaling,or fine the system when operating closed
Purge particulates to below levels which loop.A minimum 10%purge is
impact system operation or needed along with pH adjustment to
maintenance help address corrosion concerns
during the intermittent operating
periods.
To conduct maintenance not
otherwise included in(A)(1),(2), The system includes a Maintenance
or(3)of this table and not tank. If the system must be drained
(A)(4) exempted from the definition of for maintenance,the water is
Maintenance NA transport water in§423.11(p), and transferred to the maintenance tank
when water volumes cannot be and will be either returned to the
Flows managed by installed spares, system or purged in accordance with
redundancies,maintenance tanks, the 10%discharge restrictions.
and other secondary bottom ash
system equipment
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Marshall Steam Station
Certification Letter High Recycle System Description
2.2.1 Closed loop bottom ash chemistry considerations
Marshall has been operating as a closed-loop system since 2019. During that time, the bottom ash system
has experienced corrosion. Duke installed pH and alkalinity control equipment in 2020 to mitigate the
effects of the chemistry concerns, but the system continues to exhibit high concentrations of dissolved
solids,with sulfate concentrations averaging 117 times that of the incoming lake water.
Several scaling indices can be used to model the scaling and corrosive properties of the water. These are
the Puckorius Scaling Index(PSI),The Ryznar Scaling Index(RSI),the Langelier Scaling Index(LSI),
and the Larson-Skold index(L-SI). The PSI,RSI, and LSI all use alkalinity,hardness,temperature, and
pH to estimate calcium scale and corrosivity, comparing the pH of the system to the equilibrium pH and
the pH of saturation.The L-SI looks at the concentrations of carbonate,bicarbonate, sulfate, and chloride
to estimate the tendency for sulfate and chloride to interfere with scale formation and to support corrosion
due to sulfate and chloride chemistry. The target ranges for these indices are shown in Table 2-3.
Table 2-3: Key to Scaling Indexes
PSI RSI LSI L-SI
Extreme Corrosion >9.0 >9.0 <-2 >4.0
>7.5-9.0 >7.5-9.0 -2.0- -0.5 1.2-4.0
Slight Corrosion >7.0-7.5 >7.0-7.5 >-0.5-0.0 0.8-<1.2
In range >6.0-7.0 >6.0-7.0 >0.0-0.5 <0.8
Slight Scaling 5.0-6.0 5.0-6.0 >0.5-2.0 NA
Heavy Scaling <5.0 <5.0 >2.0 NA
Burns&McDonnell prepared a model of the bottom ash system to simulate existing conditions and to
predict future conditions under a variety of operating scenarios.For comparison,the model showed a
makeup water rate of 62 gpm to achieve the same bottom ash water quality that was observed in the
system.The model was then used to calculate the index values and show the potential for scale formation
or corrosion. Table 2-4 below provides a summary of these results for several potential operating
scenarios.
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Certification Letter High Recycle System Description
Table 2-4: Scaling Indexes for Purge Calculations
10%+
2021 10%Purge
Index Current
Condition gpm*
Makeup
Makeup GPM 62 87 107
Dragout or Purge GPM 41 66 66
Purge% 6.20% 10% 10%
pH 7.67 7.67 8.50
TDS mg/L 706 350 219
Calcium mg/L 95 51 31
Sulfate mg/L 374 224 131
Chloride mg/L 29.03 9.13 6.99
Puckorius SI 9.05 7.39 6.74
Ryznar SI 7.15 6.12
Langelier SI (0.12) 0.26 1.19
Larson-Skold Index 22.92 0.77
* pH control is assumed
According to the design basis,the system is expected to operate at 1.59 cycles of concentration with 16
gpm of makeup. Both the makeup rate and the observed circulating concentrations are higher than the
design basis would suggest. The current makeup rate is 62 gpm, about 4 times higher than the design
basis,and the observed circulating concentrations range from 4.58 to 117 times higher than the source
water. These observations suggest that either evaporation,dragout, and/or other system losses are higher
than the design anticipated. The best fit predictor of sulfate concentrations was to assume that the system
was operating at the lowest observed cycles of concentration(4.58).
The system is operating as a closed loop,meaning that there is no active blowdown or purge. As ash is
removed from the system,water adheres to the ash particles via surface tension,and then drains through
the ash pile. Excess water is captured in drains,but a substantial portion of the water that has adhered to
the ash evaporates or remains with the ash,rather than being returned to the system. The 2021 data shows
that for the 2021 Condition case despite the current operation of pH and alkalinity control equipment the
system water is corrosive to severely corrosive for all indexes.
The 10%Purge column of Table 2-4 represents a scenario with a total purge volume of 10%or 66 gpm
assuming that the current dragout rate represents a portion of the purge flow,and assuming that the
system would operate with pH control to maintain the pH near current levels. It shows that this purge rate
does not remove enough sulfate to bring all the indexes into a green or blue condition, which is desirable.
Further adjustment to the chemistry is needed to meet scaling and corrosion indexes. Adding the 10%
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Marshall Steam Station
Certification Letter High Recycle System Description
purge volume to the current dragout rate(considering current operations are closed loop) shows that a
10%purge plus pH control brings the system chemistry into acceptable ranges(see the 10%+Current
Makeup column in Table 2-4).No further optimization is needed beyond the pH control.
To achieve the index values shown in Table 2-4 for the 10%+Current Makeup column it was necessary
to assume that the pH was adjusted to 8.5 by increasing both the bicarbonate and carbonate alkalinity
within the system. It is therefore expected that even with a 10%blowdown,which will improve system
chemistry, further chemical treatment will be needed to protect the materials of construction.
2.3 Wastewater treatment systems at Marshall
Table 2-5 summarizes the existing water treatment systems at Marshall.
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Marshall Steam Station
Certification Letter High Recycle System Description
Table 2-5: Marshall's Wastewater Treatment Systems
System Design Capacity Current Operation Expected Operation
Type
Physical/chemical treatment
with pH adjustment,
coagulant, organosulfide, Discharge to Lined
FGD clarification, sand filtration, Retention Basin System
Wastewater 550 gpm (excluding and solids handling. (LRBS)with eventual
Treatment cooling water) Downstream of discharge via NPDES
System physical/chemical treatment Outfall 005.
is a biological treatment
system with polishing
ultrafiltration.
Coal pile runoff,misc.
stormwater flows, various
plant sump discharges,non-
chemical metal cleaning
wastes,effluent from the
Intermittent polymer FGD WW treatment system,
Low addition followed by settling bottom ash purge from the
Volume 10 MGD and pH adjustment if needed submerged flight conveyors,
Wastewater in Lined Retention Basin boiler blowdown, oily waste
System treatment effluent,
wastes/backwashes from raw
water treatment system,
equipment heat exchanger
water,and landfill leachate.
Recirculation in holding
Coal Pile pond for pH adjustment and
1500 gpm polymer addition prior to Coal pile runoff
Runoff discharging to the Lined
Retention Basin System
The Marshall facility operates a wet FGD scrubber and treats up to 550 gpm of FGD wastewater in a
physical/chemical treatment system followed by selenium reduction bioreactors and polishing
ultrafiltration. Following the FGD wastewater treatment system the effluent is routed(after internal
Outfall 004)to the LRBS. The LRBS also receives other low volume wastewater from the plant along
with coal pile runoff after being stored and treated in a holding basin with polymer and caustic. The feed
lines to the LRBS can also be treated with polymer to assist in settling solids in the basin and caustic on
the inlet or acid on the effluent to adjust pH before discharge via Outfall 005.No other wastewater
treatment systems are in use at the facility.
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r
141
APPENDIX A - BOTTOM ASH EQUIPMENT SYSTEM VOLUMES AND WATER
BALANCE
Burns& McDonnell World Headquarters
9400 Ward Parkway
Kansas City, MO 64114
O 816-333-9400
F 816-333 3690
www.burnsmcd.com

BURNsaIsDoNNELL
Marshall Steam Station
133406
Initial Certification Letter
Appendix A — Bottom Ash Equipment Volumes and
Water Balance
Rev Date By Checked Description
A 10/7/2021 LAS DRG INITIAL ISSUE
0 10/8/2021 LAS DRG ISSUED FINAL
BURNS`1SDONNELL

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Marshall Stem Station Water Schematic •
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NPDES Permit #NC0004987
► Unit 4 ID Fan Control _outfall003 Catawba County
House Cooling Water 0.2 MGD n
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V ►Condenser Cooling Water Outfall 001 ►
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1 Lake Norman
Evap 1.7 MGD
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Drinking Water •
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'Yard 3 Sumpl
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Water Treatment —� Boiler and Turbine Room 1 Yard Drain Sumps Outfalls 002a and 002b ►
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1.9 MGD 2.43 MGD (noFlow expected)
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Wash

APPENDIX B - BOTTOM ASH PIPING DETAILED BUILD-UP
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Burns& McDonnell World Headquarters
9400 Ward Parkway
Kansas City, MO 64114
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BURNS &ISDON NELL
Marshall Steam Station
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Initial Certification Letter
Appendix B — Bottom Ash Piping Detailed Build-Up
Rev Date By Checked Description
A 10/7/2021 LAS DRG INITIAL ISSUE
0 10/8/2021 LAS DRG ISSUED FINAL
BURNS 1 DONNELL

Qty Size Component Component
Line Name/Description Qty Length(If) Volume
Units (in) Volume(Cu.ft)
(gal)
Unit 1 Sluice Header to SFCs 1 ea 306.7 12 ID 240.9 1,801.7
EIP Unit 1 Sluice Header 1 ea 1,490.8 10 ID 813.1 6,082.2
Unit 2 Sluice Header to SFCs 1 ea 283.0 12 ID 222.3 1,662.6
EIP Unit 2 Sluice Header 1 ea 1,633.4 10 ID 890.9 6,664.1
Unit 3 Sluice Header to SFCs 1 ea 299.9 12 ID 235.5 1,761.7
EIP Unit 3 Sluice Header 1 ea 1,800.9 10 ID 982.2 7,347.6
Unit 4 Sluice Header to SFCs 1 ea 292.1 12 ID 229.4 1,716.0
EIP Unit 4 Sluice Header 1 ea 1,986.7 10 ID 1,083.6 8,105.8
Common LP Supply Pump Suction Header 1 ea 32.5 14 ID 31.1 232.7
Common LP Supply Pump Suction Header 1 ea 350.7 24 ID 1,033.9 7,733.8
Common LP Supply Pump Suction Header 1 ea 67.5 10 ID 37.0 276.5
Common LP Supply Pump Discharge Segments 1 ea 94.5 10 ID 51.7 387.1
Unit 1 LP Supply Header 1 ea 1,467.7 12 ID 1,152.8 8,623.2
Unit 2 LP Supply Header 1 ea 1,436.0 12 ID 1,127.8 8,436.5
Unit 3 LP Supply Header 1 ea 2,567.7 12 ID 2,016.7 15,085.9
Unit 4 LP Supply Header 1 ea 2,594.1 12 ID 2,037.4 15,241.0
Unit 1 LP Supply Header 1 ea 375.2 8 ID 130.4 975.1
Unit 2 LP Supply Header 1 ea 534.8 8 ID 185.8 1,389.9
Unit 1 LP Supply Header 1 ea 102.0 6 ID 20.5 153.0
Unit 1 LP Supply Header 1 ea 14.8 6 ID 3.0 22.1
Unit 1 LP Supply Header 1 ea 30.2 4 ID 2.7 19.9
Unit 2 LP Supply Header 1 ea 58.0 6 ID 11.6 87.0
Unit 2 LP Supply Header 1 ea 22.6 6 ID 4.5 33.9
Unit 2 LP Supply Header 1 ea 55.7 4 ID 4.9 36.8
Unit 1 LP Water to BA Hopper Overflow Tank 1 ea 68.0 4 ID 6.0 45.0
Unit 2 LP Water to BA Hopper Overflow Tank 1 ea 72.8 4 ID 6.4 48.1
Unit 3 BA Hopper Overflow Pump Suction 1 ea 39.7 8 ID 13.8 103.1
Unit 3 BA Hopper Overflow Pump Discharge 1 ea 3,088.0 8 ID 1,072.8 8,025.0
Unit 4 BA Hopper Overflow Pump Suction 1 ea 38.8 8 ID 13.5 100.7
Unit 4 BA Hopper Overflow Pump Discharge 1 ea 2,791.7 8 ID 969.9 7,255.1
Unit 1 BA Hopper Overflow Pump Discharge 1 ea 2,104.7 8 ID 731.2 5,469.6
Unit 1 BA Hopper Overflow Pump Suction 1 ea 32.2 8 ID 11.2 83.6
Unit 2 BA Hopper Overflow Pump Discharge 1 ea 2,201.2 8 ID 764.7 5,720.5
Unit 2 BA Hopper Overflow Pump Suction 1 ea 32.7 8 ID 11.3 84.9
Unit 3 LP Supply Header 1 ea 578.0 8 ID 200.8 1,502.2
Unit 3 LP Supply to Hopper Overflow Tank 1 ea 108.1 4 ID 9.6 71.5
Unit 3 LP Supply Header 1 ea 23.7 6 ID 4.7 35.5
Unit 4 LP Supply Header 1 ea 261.0 8 ID 90.7 678.2
Unit 4 LP Supply to Hopper Overflow Tank 1 ea 120.5 4 ID 10.6 79.7
Unit 4 LP Supply Header 1 ea 111.2 6 ID 22.3 ,166.8
Unit 1 LP Pump Discharge Min Flow Recirc 1 ea 127.2 6 ID 25.5 190.8
Unit 2 LP Pump Discharge Min Flow Recirc 1 ea 121.4 6 ID 24.4 182.2
Unit 3 LP Pump Discharge Min Flow Recirc 1 ea 115.9 6 ID 23.3 173.9
Unit 4 LP Pump Discharge Min Flow Recirc 1 ea 110.3 6 ID 22.1 165.5
SFC Sump Discharge Header 1 ea 415.7 61D 83.4 623.9
U1/2 Common HP Header 1 ea 35.5 12 ID 27.9 208.6
U1 HP Supply Header 1 ea 447.7 12 ID 351.6 2,630.3
U2 HP Supply Header 1 ea , 610.8 12 ID 479.7 3,588.7
U1 HP Supply Header 1 ea 72.3 10 ID 39.6 296.2
Ui HP Supply Header 1 ea 28.9 6 ID 5.8 43.4
U2 HP Supply Header 1 ea 45.7 10 ID 25.0 187.0
U2 HP Supply Header 1 ea 32.5 6 ID 6.5 48.8
U3/4 Common HP Header 1 ea 34.3 12 ID 27.0 201.7
U3 HP Supply Header 1 ea 613.8 12 ID 482.1 3,606.0
U4 HP Supply Header 1 ea 453.2 12 ID 356.0 2,662.9
U3 HP Supply Header 1 ea 22.1 10 ID 12.1 90.5
U3 HP Supply Header 1 ea 133.8 8 ID 46.5 347.8
U4 HP Supply Header 1 ea 91.7 10 ID 50.2 375.5
U4 HP Supply Header 1 ea 15.8 6 ID 3.2 23.7
Total Piping Volume 1 LOT 138,993.1

11141
BURNS M_C
DONNELL.
CREATE AMAZING.
i
Burns& McDonnell World Headquarters
9400 Ward Parkway
Kansas City, MO 64114
O 816333-9400
F 333-3690
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