NC0024406_Initial Certification Statement to Discharge Bottom Ash Transport Water_20211013

P
Julie K.Turner,Vice President
/ 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 202i
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 Chemikov,Ph.D.
Initial Certification
Page 2
subsequent permit revisions. As detailed in the attached documents,these values have changed
slightly. As permits are modified,this information will be corrected. In the interim, we have
worked with our generating stations to ensure that they will comply with the updated values in
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 1 DONNELL
Belews Creek Steam Station
Initial Certification Statement to
Discharge Bottom Ash Transport Water
( DUKE
REC
EIVED vcr ENERGY®
OCT 132021
NCDEQIDWRINPDES Duke Energy
Belews Creek Steam Station
Project No. 133405
Revision 0
October 8, 2021

Belews Creek Steam Station
Initial Certification Statement to
Discharge Bottom Ash Transport
J
Water
Prepared for
Duke Energy
Belews Creek Steam Station
Project No. 133405
Stokes County, North Carolina
Revision 0
October 8, 2021
Prepared by
Burns & McDonnell Consultants, Inc.
Kansas City, Missouri

INDEX AND CERTIFICATION
Duke Energy
Belews Creek 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 10
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 Belews Creek 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§423.19(c). I hereby certify that I am familiar with the ELG regulation requirements and Duke
Energy's Belews Creek Steam Station.
```,‘„'"n,,,rn,,,,,,'
:1;;AS
_ Dave Guinta, P.E.
360 (North Carolina License No. PE045360)
, 10/08/2021
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 Ener •
Jul' .Turner
(Printed Name)
Vice President, Carolinas Coal Generation
(Title)
October 12,2021
(Date)

Belews Creek 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 2-4
2.3 Wastewater treatment systems at Belews 2-6
APPENDIX A— BOTTOM ASH EQUIPMENT SYSTEM VOLUMES AND WATER
BALANCE
APPENDIX B — BOTTOM ASH PIPING DETAILED BUILD-UP
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Belews Creek Steam Station
Certification Letter Table of Contents
LIST OF TABLES
Page No.
Table 2-1: Belews' Active Wetted Volume Summary 2-3
Table 2-2: Belews' Purge Discharges 2-3
Table 2-3: Key to Scaling Indexes 2-5
Table 2-4: Calculated Scaling Indexes for Purge Volumes 2-5
Table 2-5: Belews' Wastewater Treatment Systems 2-7
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Belews Creek 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
Belews Belews Creek Steam Station
CCR Coal Combustion Residual
Code of Federal
CFR 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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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 Belews Creek Steam Station(Belews),located in Stokes
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)
primary active wetted bottom ash system volume in 40 CFR 423.11 as . refer to Table 2-
D. Thep ry y § ( )
2-
1)
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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)
w 1 200 MW coal fired units for a total combined electrical power
The Belews Creek Steam Station has two p
capacity of 2,400 MW. The two units were modified in 2020 and are now able to operate with either coal
or natural gas as their fuel supply. Belews'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 72,700
gallons per day) related to system water chemistry as allowed under 40 CFR§ 423.13(k)(2)(i).
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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 Belews, 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 Belews.
2.1 Bottom Ash System Description
Units 1 &2 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 two remote dewatering conveyors.
Bottom ash particles are settled in the operating conveyor with the assistance of lamella assemblies. The
settled ash particles are then dragged out of the wetted portion of the conveyor and emptied into a
dewatering bunker before being transported via truck to the CCR landfill for disposal. Transport water
from the dewatering process overflows the operating conveyor 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 conveyor.
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 two remote dewatering conveyors.
Major equipment for Belews's bottom ash system consists of two boiler hoppers,two dewatering
conveyors,two process overflow troughs, one surge tank,two bottom ash overflow hoppers,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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I
Belews Creek Steam Station
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.
UI HP Water U2 HP Water
7 Suppey Pumps J S,Ipp y Purr Pipe Hack ,
F):711 3-
- - J:
.- '- -_ ,- I Prpa Rack
ursar-- ,
IUt Hopper Overflow Taro U2 Hopper Overflow Tank I
SFC Island
Surge Tank • • / _---_^
r
/rr
•
•� 4'
Figure 1 —Belews Creek Steam Station Plan Drawing
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Certification Letter High Recycle System Description
Table 2-1: Belews'Active Wetted Volume Summary
Description Qty Qty Total
Component Cumulative
Units Volume Component System Volume
Volume
(Gal) (Gal) (Gal)
Unit 1 Bottom Ash Hopper 1 ea 68,409 68,409 68,409
Unit 2 Bottom Ash Hopper 1 ea 68,409 68,409 136,817
Bottom Ash Hopper Overflow 2 ea 1,728 3,456 140,273
Tanks
Dewatering Conveyors 2 ea 147,130 294,259 434,532
Process Overflow Trough 1 ea 5,028 5,028 439,560
-
SFC Sump 1 ea 7,719 7,719 447,279
Surge Tank 1 ea 221,063 221,063 668,343
Piping* 1 lot 59,388 59,388 727,731
Total Nominal Volume 727,700
10% gallon/day 72,770
10% gallon/hour 3,032
10% gallon/min 51
*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 Belews:
Table 2-2: Belews' Purge Discharges
Discharge Average Description Frequency
Stream Flow(gpm)
Following significant storm events.
The system was designed to manage a
Precipitation-related inflows
P 25-year/24-hour storm event
generated from storm events
equivalent to 6 of rainfall atop open
exceeding a 10-year storm event of top tanks and sump, or 21,100 gallons.
(A)(1) 24-hour or longer duration(e.g., 30- This volume would replace up to 14.7
Stormwater NA day storm event)and cannot be gpm of makeup water during the once
managed by installed spares, in 25-year event. If storm water
redundancies, maintenance tanks, exceeded this design volume, a short
and other secondary bottom ash term purge would be needed to avoid
system equipment overflowing the system tanks and
conveyors.
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Certification Letter High Recycle System Description
Discharge Average Description Frequency
Stream Flow(gpm)
(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 Belews and,therefore,will not
Wastestreams bottom ash system to accept require discharge.
recycled water
Makeup water is very soft and
somewhat corrosive. Water within the
To maintain system water bottom ash system has strong
chemistry where installed corrosive tendencies that increase over
(A)(3) equipment at the facility is unable time when the system is operating.
Water to manage pH,corrosive Sulfate concentrations are about 150
50.5 substances,substances or times higher than the lake water that
Chemistry conditions causing scaling,or fine feeds the system when operating
Purge particulates to below levels which closed 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
2.2.1 Closed loop bottom ash chemistry considerations
Belews has been operating as a closed-loop system since 2018. 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 150 times that of the incoming lake water,even though the
system was designed to operate at 1.2 cycles of concentration and is operating within the original design
basis with respect to makeup water flow rates.
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
Duke Energy—Belews Creek Steam Station 2-4 Burns&McDonnell
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Belews Creek Steam Station
Certification Letter High Recycle System Description
pH to estimate calcium scale and corrosivity, comparing the pH of the system to the equilibrium pH and
the pH of saturation for calcium carbonate. The L-SI looks at the concentrations of carbonate,
bicarbonate, sulfate,and chloride to estimate the tendency for sulfate and chloride to interfere with
protective 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 12.6 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.
Table 2-4: Calculated Scaling Indexes for Purge Volumes
10%+
2021 10%Purge
Index Baseline gpm* Current
Makeup*
Makeup GPM 13 51 63
Purge% 2.39% 10% 10%
pH 9.01 9.01 9.00
TDS mg/L 1,113 300 248
Calcium mg/L 229 56.2 45.1
Sulfate mg/L 805 189 149
Chloride mg/L 17.5 7.13 6.44
Puckorius SI 6.52 6.69
Ryznar SI 5.92 5.45 5.64
Langelier SI 1.55 1.78 1.68
Larson-Skold I 0.93 0.74
* pH control is assumed
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Belews Creek Steam Station
Certification Letter High Recycle System Description
Plant operating data summarized in the 2021 Baseline column of Table 2-4 indicates that an average
observed makeup water rate of 12.6 gpm is required to replace water that is evaporated,removed with the
ash,or results from miscellaneous other system losses.
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 Baseline case despite the current operation of pH and alkalinity control equipment the
system water is both scaling and corrosive,with the sulfate concentrations elevating the Larson-Skold
index into a severe corrosion range.
The 10%Purge column of Table 2-4 represents a scenario with a total purge volume of 10%or 50.53
gpm, as if the current makeup rate represents a portion of the purge flow,and assuming that the system
would operate with pH control. 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 indexes. Adding the 10%purge volume to the current makeup 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.
Because the L-SI shows that sulfate concentrations create a significant corrosion concern,the system was
modeled to create conditions that would provide an acceptable L-SI. To achieve the index values shown
above, it was necessary to purge 50.53 gpm in addition to the current dragout,creating a makeup rate of
62.62 gpm, and to assume that the pH was adjusted to 9.0 by greatly increasing the bicarbonate alkalinity
within the system. A preliminary estimate indicates that achieving this level of pH adjustment would
require adding an estimated 1100 lbs/day of active ingredient(alkalinity as limestone or soda ash)more
than is currently being used. It is therefore expected that even with a 10%blowdown,which will improve
system chemistry,further pH adjustment will be needed to protect the materials of construction.
2.3 Wastewater treatment systems at Belews
Table 2-4 summarizes the existing water treatment systems at Belews.
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Belews Creek Steam Station
Certification Letter High Recycle System Description
Table 2-5: Belews'Wastewater Treatment Systems
System Design Capacity Current Operation Expected Operation
Type
Physical/chemical treatment
with pH adjustment,
FGD coagulant,organosulfide, Discharge to Lined
clarification,and solids Retention Basin System
Wastewater 640 gpm(excluding handling. Downstream of (LRBS)with eventual
Treatment cooling water) physical/chemical treatment discharge via NPDES
System is a biological treatment Outfall 003.
system with polishing
ultrafiltration.
Sanitary
Wastewater 7 gpm Domestic Wastewater Plant Ongoing
Treatment
System
Domestic wastewater
discharge,coal pile runoff,
misc. stormwater flows,
cooling tower blowdown,
effluent from the FGD WW
Intermittent polymer treatment system,plant
Low addition followed by settling sumps, equipment heat
Volume 9.6 MGD and pH adjustment if needed exchanger water,bottom ash
Wastewater in Lined Retention Basin purge from the submerged
System flight conveyors,remediated
groundwater,emergency
release of anhydrous
ammonia,release of
ammonia during quarterly
testing, and landfill leachate.
Recirculation in holding
Coal Pile pond for pH adjustment and
1600 gpm polymer addition prior to Coal pile runoff
Runoff discharging to the Lined
Retention Basin System
The Belews facility operates a wet FGD scrubber and treats up to 640 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 002)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
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Certification Letter High Recycle System Description
the inlet or acid on the effluent to adjust pH before discharge via Outfall 003. Sanitary wastewater is
treated aerobically in an aerated facultative lagoon and discharged via Outfall 009 through the LRBS. The
water balance for Belews is included in Appendix A.No other wastewater treatment systems are in use at
the facility.
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lig ,
APPENDIX A - BOTTOM ASH EQUIPMENT SYSTEM VOLUMES AND WATER
BALANCE
Burns& McDonnell World Headquarters
Si
9400 Ward Parkway
Kansas City, MO 64114
0 816-333-9400
F 816-333-3690
www.burnsmcd.com

r
BURNS $ 1DONNELL
Belews Creek Steam Station
133405
Initial Certification Letter
Appendix A — Bottom Ash Equipment Volumes
Rev Date By Checked Description
0 9/7/2021 LAS DRG INITIAL ISSUE
B 10/5/2021 LAS DRG UPDATED DRAFT
0 10/8/2021 LAS DRG ISSUED FINAL
BURNS&ISDONNELL

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NPDES Permit #NC0024406
Jr
Station Equipment Low&High Hydrogen&Oil
0.35 MGD Pressure Service ►
Cooling Water Cooler System
Water ►
Belews Lake
Condenser OUTFALL001
► Cooling Water A 1278MGD ►
V
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Station Intake ► RCW Cooler Stormwater 0.08MGD
Area
1 Stormwater
0.02 MGD ►
Ash Basin
I Pump House ► Yard Holding
Intake Screen Sump Sump
Backwash * I 0.46 MGD ►
West Holding I OUTFALL003 Dan River
Craig Road ► Water Treatment ► Condenser Pump Chemical e.60MGD III.
Landfill Leachate Feedwater �___►
Holding Pond
-
Coal Yard 3.74 MGD
Gypsum- —
Limestone Runoff Sumps FGD Treated
Retention
2.88 MGD Wastewater
Basin Sump
Consolidated •
Sanitary Waste ► 1.63MGD Coal Pile
Sump System OJ2 MGD
Holding Basin
LP Ash Sluicing v
Pump Intake -0Ash Sluice ► Submerged I ► ►
Flight Conveyor Coal Pile Holding
Area ► Basin Sump ssaMGD
► Retention-
•Pine Hall Landfill Pine Hall Landfill Basin
Leachate Leachate Sump 0.63 MGD
REVISION:0 DATE: 3/25/2016 DES: BJM CHK:JTL

r
11
APPENDIX B — BOTTOM ASH PIPING DETAILED BUILD-UP
Silk Burns& McDonnell World Headquarters
9400 Ward Parkway
Kansas City, MO 64114
O 816-333-9400
F 816-333-3690
www.burnsmcd.com

BURNS 1SDONNELL
Belews Creek Steam Station
133405
Initial Certification Letter
Appendix B — Bottom Ash Piping Detailed Build-Up
Rev Date By Checked Description
A 10/5/2021 LAS DRG INITIAL ISSUE
0 10/8/2021 LAS DRG ISSUED FINAL
BURNS�MSDONNELL

r
Line Name/Description Qty Qty Length(If) Size Component Component
Units (in) Volume(Cu.ft) Volume(gal)
Common Ash Sluice Header 1 ea _ 1,103.4 12 ID 866.6 6,482.9
Unit 1 Ash Sluice Header 1 ea 1,514.9 12 ID 1,189.8 8,900.4
Unit 1 Ash Sluice Header-EIP 1 ea 762.9 12 ID 599.2 4,482.2
Unit 2 Ash Sluice Header 1 ea 1,152.0 12 ID 904.8 6,768.0
Unit 2 Ash Sluice Header 1 ea 239.3 12 ID 187.9 1,405.6
"Header"at surge tank oulet and LP water supply pump inlet 1 ea 120.8 24 ID 356.3 2,665.0
LP Water system.From Surge tank to header 1 ea 29.7 14 ID 28.5 212.9
Inlet to LP water pump(from 24""header") 1 ea 52.0 10 ID 28.5 213.0
Outlet of LP water pump to 12""header" 1 ea 345.3 10 ID 0.0
LP pumps to HP pump SFC area(goes over top of surge tank) 1 ea 95.3 6 ID 19.1 143.0
LP pumps to HP pump SFC area(goes over top of surge tank) 1 ea 99.7 6 ID 20.0 149.6
Min Flow Recirc Line 1 ea 270.8 3 13.9 104.0
LP water pump discharge at SFC/surge tank to LP water supply in
boiler building area/HP pumps-Unit 1 1 ea 1,466.5 12 1,139.9 8,527.4
LP water pump discharge at SFC/surge tank to LP water supply in boils 1 ea 1,183.1 12 919.6 6,879.2
Piping from Overflow Pumps to SFC-Unit 1 1 ea 2,007.1 8 697.3 5,216.1
Piping from Overflow Pumps to SFC-Unit 2 1 ea 1,276.4 8 443.4 3,317.0
Unit 1 HP Water Supply Pump Discharge to Existing HP Water Header
(to sluice pumps) 1 ea 326.4 12 ID 256.3 1,917.5
Unit 1 HP Water Supply Pump Min Flow Line 1 ea _ 52.7 8 ID 18.3 136.9
Unit 1 Overflow Pump Suction Piping 1 ea 33.0 10 ID 18.1 135.2
Unit 2 Overflow Pump Suction Piping 1 ea 33.6 10 ID 18.4 137.6
CDR Sump Discharge Line 1 ea 177.9 6 ID 35.7 267.0
Unit 2 HP Water Supply Pump Discharge Header 1 ea 185.3 12 ID 145.5 1,088.4
Unit 2 HP Water Supply Pump Discharge Header to Existing HP Pump 1 ea 15.7 10 ID 8.6 64.3
Unit 2 HP Water Supply Pump Discharge Header to Existing HP Pump 1 ea 17.2 6 ID 3.5 25.8
Unit 2 HP Water Supply Pump Min Flow Line 1 ea 57.2 8 ID 19.9 148.7
Total Piping Volume 1 LOT 59,387.7

BURNS M _C
DONNELL,�
CREATE AMAZING.
Burns& McDonnell World Headquarters
9400 Ward Parkway
Kansas City, MO 64114
O 816-333-9400
F 816-333-3690
www.burnsmcd.com