NC0004979_Initial Certification State to Discharge Bottom Ash Transport Water_20211013

f '
Julie K.Turner,Vice President
/`•s 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 27699-1617RECEIVED
Reference: Duke Energy Progress, LLC 0 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-clay 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 offines 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

BURNStilISDONNELL.
Allen Steam Station
Initial Certification Statement to
Discharge Bottom Ash Transport Water
steNaN DUKE
ENERGY®
RECEIVED
Duke Energy
)Cr13202 1
NODE /Q DWR/NP
®ES Allen Steam Station
Project No. 133407
Revision 0
October 8, 2021

Alien Steam Station
Initial Certification Statement to
Discharge Bottom Ash Transport
Water
Prepared for
Duke Energy
Allen Steam Station
Project No. 133407
Belmont, North Carolina
Revision 0
October 8, 2021
Prepared by
Burns & McDonnell Consultants, Inc.
Kansas City, Missouri

INDEX AND CERTIFICATION
Duke Energy
Allen 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 6
Appendix A Bottom Ash Equipment System Volume and Water Balance 9
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 Allen Steam Station in
accordance with standard engineering practices and based on my knowledge, information, and belief,the
content of this Certification when developed in August 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 Allen Steam Station.
00,0111,n,n,,,,,,,,
N CAR
Dave Guinta, P.E.
1 0/k) 360 (North Carolina License No. PE045360)
ss 10/08/2021 Date: 10/8/2021
, iD GU\�• `,•`` ,.

Owner's Certification of Compliance - 40 CFR 122.22
Pursuant to 40 CFR 122.22, I certify under penalty of law that this document e t 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 beha of Duke Ener :
G�1
Juli . Turner
(Printed Name)
Vice President, Carolinas Coal Generation
(Title)
October 12,2021
(Date)

Allen Steam Station
Certification Letter Table of Contents
TABLE OF CONTENTS
Page No.
1.0 EXEC
UTIVE 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) 2-4
2.2.1 Closed loop bottom ash chemistry considerations 2-5
2.3 Wastewater treatment systems at Allen 2-8
APPENDIX A — BOTTOM ASH EQUIPMENT SYSTEM VOLUMES AND WATER
BALANCE
APPENDIX B — BOTTOM ASH PIPING DETAILED BUILD-UP
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Allen Steam Station
Certification Letter Table of Contents
LIST OF TABLES
Page No.
Table 2-1: Allen's Active Wetted Volume Summary 2-4
Table 2-2: Allen's Purge Discharges 2-4
Table 2-3: Scaling Index Ranges 2-6
Table 2-4: Circulating Water Quality and Scaling Indexes for Purge Calculations 2-7
Table 2-5: Allen's Wastewater Treatment Systems 2-8
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Allen 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
Allen Allen Steam Station
CCR Coal Combustion Residual
CDR Continuous Dewatering and Recirculating
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
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Allen 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 Allen Steam Station(Allen), located in Belmont,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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Allen 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 Section 2.3).
I. A narrative discussion of each treatment system including the system type, design capacity,and
current or expected operation(refer to Section 2.3).
Allen consists of five operating coal-fired units: Units 1 and 2 are both 165 MW pulverized coal fired units
built in 1957. Units 3, 4 and 5 are all 275 MW pulverized coal fired units built in 1959, 1960 and 1961,
respectively. Unit 3 has been retired and is no longer in operation. Two more units are scheduled for
retirement in December of 2021, with the remaining units operating intermittently and scheduled for
retirement in December of 2023.Allen's existing BAT high recycle system utilizes wet sluicing to transport
bottom ash 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 58,100 gallons per day) related to system water
chemistry, limited remaining operating life, and intermittent operation as allowed under 40 CFR §
423.13(k)(2)(i).
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Allen 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 Allen, 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 Allen.
2.1 Bottom Ash System Description
Units 1 &2 each have one bottom ash hopper,while Units 4& 5 each have two bottom ash hoppers in
operation(6 total hoppers in operation). 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. The Unit I &2 hoppers are conveyed to the
two remote dewatering conveyors via a common pipeline. Unit 4 & 5 each have a dedicated header which
is used to convey the ash from the two hoppers per unit into the two remote dewatering conveyors.
Bottom ash particles are settled in the 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 a dewatering
bunker before being transported via truck to the CCR landfill for disposal. Transport water from the
dewatering process overflows each conveyor into a single surge tank and 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 the bottom ash hoppers overflow into three separate
hopper overflow tanks: one shared by the Unit 1 &2 hoppers, one shared by the two Unit 4 hoppers,and
one shared by the two Unit 5 hoppers. This water collected in the overflow tanks is then conveyed to the
two remote dewatering conveyors.
A Continuous Dewatering and Recirculation(CDR) 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.
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Allen Steam Station
Certification Letter High Recycle System Description
Major equipment for Allen's bottom ash system consists of six boiler hoppers,two dewatering conveyors,
two process overflow troughs, one surge tank,three bottom ash overflow hoppers,and the CDR 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.
A summary of pertinent system data is provided in
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Certification Letter High Recycle System Description
Table 2-1. A site plan can be found below on Figure 1.
a1 OVERFLOW TANK AND 2 _ -
OVERFLOW PUMPS IN I i ] e
:BASEMENT FOR EACH UNIT a
(TOTAL 5 TANKS,10 PUMPS) .-.— y .'
1mgg ,1� A (�( i
SFC HP PUM �` ( i �Vi k EI HOLDING BASIN f'�
(3)IN BASEMENT mil 1 l !If "..a v�px. —
rr , 7 UTILITY RACK •■; ''
t J L. I 1 r •I,• �� ��Cam/ /
± 4!)
li �If Mitirli=7.7 „`.' '\` •i "li,m ti now.. � m• r I :v I • 71 . �
l ,�1,,,,,,i,,,,„ila \ A
a ;\1,4 l'i7+iL �. I'ti` SFC A /�
e ....p ik = t ,. MAINTENANCE i 4 / r
• 41- i a1 j�s ��<— i TANK /1 1 '�
dlf DEWATERING i' ,,,—
1a \ BUNKERS—, \ r�� /'i/'/
LOADINGAREA \ .
',. • . �ft f —la \, Ifi q .
/,•�i virot ,POWER DISTRIBUTION
• �Y/lij��. ,� -,.\s�,: ; ��I ` CENTER(PDC)
,�`S .I 41i' _/ SURGE TANK
�;',$ ittp. I �/- SUBMERGED FLIGHT/
. ` CONVEYORS(SFC)
Figure 1 -Allen Steam Station Plan Drawing
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I
Allen Steam Station
Certification Letter High Recycle System Description
Table 2-1: Allen's Active Wetted Volume Summary
Component Total Cumulative
Qty Volume Component System Volume
Description Qty Units Volume y
(Gal) (Gal) (Gal)
Unit 1&2 Bottom Ash Hopper 1 ea 22,442 22,442 22,442
Unit 4 Bottom Ash Hopper 1 ea 24,686 24,686 47,127
Unit 5 Bottom Ash Hopper 1 ea 24,686 24,686 71,813
Bottom Ash Hopper Overflow 3 ea 590 1,770 73,583
Tanks
Dewatering Conveyors 2 ea 147,130 294,259 367,842
Process Overflow Trough 2 ea 5,028 10,057 377,899
CDR Sump 1 ea 7,719 7,719 385,618
Surge Tank 1 ea 100,728 100,728 486,346
Piping* 1 lot 94,582 94,582 580,928
Total Nominal Volume 580,900
10% gallon/day 58,090
10% gallon/hour 2,420
10% gallon/min 40
*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 Allen:
Table 2-2: Allen's Purge Discharges
Discharge Average
Stream Flow Description Frequency
(gpm)1
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 14,850 gallons.
exceeding a 10-year storm event of This volume would replace up to 10.3
(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.
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Allen Steam Station
Certification Letter High Recycle System Description
Discharge Average
Stream Flow Description Frequency
(gpm)1
(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 Allen 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
(A)(3) chemistry where installed corrosive tendencies that increase over
equipment at the facility is unable time when the system is operating.
Water to manage pH,corrosive Sulfate concentrations are about 20
Chemistry 40 substances,substances or times higher than the lake water that
conditions causing scaling,or fine feeds the system when operating
Purge particulates to below levels which closed loop.A 10%purge is needed
impact system operation or along with pH adjustment to help
maintenance 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
Allen has been operating as a closed-loop system since July of 2019. During that time,the bottom ash
system has experienced corrosion. Duke installed pH control equipment in November of 2019 to mitigate
the effects of the chemistry concerns.Due to the intermittent nature of system operations only a small
dataset was available to evaluate baseline system water quality;however,the available data correlated
well with predicted concentrations.Table 2-4 shows that despite the current operation of pH and
alkalinity control equipment the system water is corrosive under current conditions(when in operation),
and that a 10%purge plus pH adjustment would be needed to improve the water quality.
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
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Allen 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. 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: Scaling Index Ranges
PSI RSI LSI L-SI
Extreme Corrosion >9.0 >9.0 <-2 >4.0
>9.0 - >7-5-9.0 -2.0- -0.5 40
Slight Corrosion >7-0 >7-0-7.5 >-0-5 0.8-
7.5 0.0 <1.2
>6-0- >6-0-7.0 >0-0-0.5 <0.8
In range 7.0
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 12.7 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: Circulating Water Quality and Scaling Indexes for Purge Calculations
2021 10%+
10%Purge
Index Condition * Current Optimize
(gpm) gpm Makeup Indexes
Makeup GPM 13 40 52 32
Purge% 2.90% 10% 10% 5%
pH 8.20 9.00 9.00 9.00
TDS mg/L 196 79 71 88
Calcium mg/L 33 11 9 13
Sulfate mg/L 106 33 25 37
Chloride mg/L 7.09 3.77 3.71 3.79
Puckorius SI 11.22
Ryznar SI 9.26 6.99 7.15 6.84
Langelier SI 1.01 0.92 1.08
Larson-Skold I 10.27 0.18 0.14 0.20
* pH control is assumed
Plant operating data summarized in the 2021 Condition column of Table 2-4 indicates that an average
observed makeup water rate of 13 gpm is required to replace water that is removed with the ash and
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 Condition 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 40 gpm,
as if the current makeup rate represents a portion of the purge flow, and assuming the system would
operate with pH control. It shows that this purge rate brings all the indexes into a green or blue condition,
which is desirable,aside from the PSI. Adding the 10%purge volume to the current makeup rate
(considering current operations are closed loop)shows that increasing the purge rate does not improve the
PSI, and that further adjustment to the chemistry would be needed to meet this scaling index.
Because the PSI shows that increasing the purge rate had a negative effect on this scaling index,the
system was modeled to create conditions that would optimize the PSI while remaining in the acceptable
ranges for the other scaling and corrosion indexes. To optimize the index values, a purge of 5%of the
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Allen Steam Station
Certification Letter High Recycle System Description
system volume each day(32 gpm)while also adjusting the pH to 9 by increasing both the bicarbonate and
carbonate alkalinity within the system (see the Optimize Indices column in Table 2-4). Therefore, it is
projected that a 5%to 10%purge and pH adjustment would improve the system,but further chemistry
adjustments would also be required to get the PSI into an appropriate range.
2.3 Wastewater treatment systems at Allen
Table 2-5 summarizes the existing water treatment systems at Allen.
Table 2-5: Allen's Wastewater Treatment Systems
System Design Capacity Current Operation Expected Operation
Type
Physical/chemical treatment
with pH adjustment,
coagulant, organosulfide, Discharge to primary settling
clarification, and solids basin with eventual
handling. Downstream of discharge via NPDES
FGD physical/chemical treatment Outfall 006.
Wastewater is a biological treatment
Treatment 440 gpm (excluding system with polishing
System cooling water) ultrafiltration.
Domestic wastewater
discharge, coal pile runoff,
misc. stormwater flows,
wastewater from turbine
non-destructive testing,CCR
Intermittent polymer and landfill leachate, effluent
Low addition followed by settling from the FGD WW
Volume 6.0 MGD and pH adjustment if needed treatment system,yard drain
Wastewater in Lined Retention Basin sump,water treatment filter
System backwash,bottom ash purge
from the submerged flight
conveyors,extracted
groundwater, laboratory
wastes, and the power house
sump at Unit 5.
Recirculation in holding
Coal Pile pond for pH adjustment and
1100 gpm polymer addition prior to Coal pile runoff
Runoff discharging to the Lined
Retention Basin System
The Allen facility operates a wet FGD scrubber and treats up to 440 gpm of FGD wastewater in a
physical/chemical treatment system followed by selenium reduction bioreactors and polishing
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Allen Steam Station
Certification Letter High Recycle System Description
ultrafiltration. Following the FGD wastewater treatment system the effluent is routed(after internal
Outfall 005)to the Lined Retention Basin System (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 and caustic to
adjust pH and assist in settling solids in the basin before discharge via Outfall 006. The water balance for
Allen is included in Appendix A.No other wastewater treatment systems are in use at the facility.
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111111
APPENDIX A - BOTTOM ASH EQUIPMENT SYSTEM VOLUMES AND WATER
BALANCE
Burns& McDonnell World Headquarters
9400 Ward Parkway
Kansas City, MO 64114 1
O 816-333-9400
F 816-333-3690
www.burnsmcd.com

BURNS MSDONNELL
Allen Steam Station
133407
Initial Certification Letter
Appendix A — Bottom Ash Equipment Volumes and
Water Balance
Rev Date By Checked Description
A 9/1/2021 LAS DRG INITIAL ISSUE
B 9/27/2021 LAS DRG UPDATED DRAFT
C 10/5/2021 LAS DRG UPDATED DRAFT
0 10/8/2021 LAS DRG ISSUED FINAL
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Plant Allen 2018 Water Schematic
1 Condenser Cooling Outfall 001
Water 649 MGD South Fork River
Outfall 002A
Intermittent Catawba River
Sanitary Waste 1
Coal Handling
-- Stormwater f-- Sumps
Landfill Leachate 1 Coal Yard Sump
1
An Holding osin
Internal ><
1 FGD 1 FGD W WTS OutfallOutfall�D2 QDS Stormwater # Ash Basin _
18.6 MOD 18.6 MGD
Catawba River
Water Treatment Seeps!
FGD Storm water
Sump
Atm T
1 Ash Silo Sump _ Sto m ater _ 1
Catawba River 1 Boiler 1 Turbine Mt Sumps
4 I 1
Boiler Rm Sumps 1 Yard Drain Sump Retention Basin _ New Outfall 00X
6.0 MGD
Catawba River
Misc Equip Cooling Outfall 003
&Seals 4.5 MGD South Fork River
1 Powerhouse sumo Outfall 002B
(Intermittent) Catawba River
Limestone Storm
water Sump
Intake Screen _ Outfall 004
1 Backwash 6.5 MGD Catawba River
Asiatic Clam/Debris
Filter Backwash Catawba ItIver
Hold:
1)Line for Intake screen to Catawba ever
2)Line from Asiatic Clam/Debris Filter Backash to Catwba river
3)Intermittent water line from Powerhouse to Catawba river
4)APH line

111
APPENDIX B - BOTTOM ASH PIPING DETAILED BUILD-UP
Burns& McDonnell World Headquarters
9400 Ward Parkway
Kansas City, MO 64114
jm

BURNS &MSDONNELL
Allen Steam Station
133407
Initial Certification Letter
Appendix B — Bottom Ash Piping Detailed Build-Up
Rev Date By Checked Description
A 9/30/2021 LAS DRG INITIAL ISSUE
0 10/8/2021 LAS DRG ISSUED FINAL
BURNS t1SDONNELL

1
Line Name/Description Qty Qty Length(If) Size Component Component
Units (in) Volume(Cu.ft) Volume(gal)
Unit 1/2 Ash Sluice to SFC(Ash Line A) 1 ea 798.6 12 627.2 4,691.8
Unit 4 Ash Sluice to SFC(Ash Line D) 1 ea 672.8 12 528.5 3,953.1
Unit 5 Ash Sluice to SFC(Ash Line C) 1 ea 544.5 12 427.6 3,199.0
U1/2 BA Hopper Overflow to SFC 1 ea 3,090.7 8 1,073.7 8,032.0
U4 BA Hopper Overflow to SFC 1 ea 2,603.1 8 904.3 6,764.8
U5 BA Hopper Overflow to SFC 1 ea 3,014.4 8 1,047.2 7,833.8
U 1/2 BA hopper to 1/2 Overflow tank 1 ea 82.9 8 28.8 215.4
U 4 BA hopper to U4 Overflow tank 1 ea 54.5 8 18.9 141.6
U 5 BA hopper to U5 Overflow tank 1 ea 55.5 8 19.3 144.2
Discharge of LP water supply pumps-Unit 1/2 1 ea 2,737.6 12 2,150.1 16,084.1
Discharge of LP water supply pumps-Unit 4 1 ea 2,695.7 12 2,117.2 15,837.8
Discharge of LP water supply pumps-Unit 5 1 ea 2,712.1 12 2,130.1 15,934.0
"Header"at surge tank oulet and LP water supply pump inlet 1 ea 241.4 24 673.9 5,041.1
LP Water system.From Surge tank to header 1 ea 9.5 14 8.9 66.9
Inlet to LP water pump(from 24""header") 1 ea 49.1 10 26.9 201.2
LP pumps to HP pump SFC area(goes over top of surge tank) 1 ea 83.4 6 16.7 125.2
LP pumps to HP pump SFC area(goes over top of surge tank) 1 ea 86.5 6 17.4 129.8
LP pumps to HP pump SFC area(goes over top of surge tank) 1 ea 80.5 6 16.1 120.7
Wraps around surge tank 1 ea 140.4 3 28.2 210.7
Inlet to HP water supply pumps 1 ea 161.7 12 127.0 950.1
Inlet to HP water supply pumps 1 ea 120.3 12 94.5 706.7
Inlet to HP water supply pumps 1 ea 183.3 12 143.9 1,076.6
To clinker crusher/hopper area from LP water pumps 1 ea 593.0 6 119.0 890.0
To clinker crusher/hopper area from LP water pumps 1 ea 236.8 6 47.5 355.4
To clinker crusher/hopper area from LP water pumps 1 ea 71.7 6 14.4 107.6
Pipes around Hopper,overflow tank,and clinker crusher 1 ea 8.9 3 0.5 3.4
Pipes around Hopper,overflow tank,and clinker crusher 1 ea 19.2 3 1.0 7.4
Pipes around Hopper,overflow tank,and clinker crusher 1 ea 25.9 3 1.3 10.0
Pipes around Hopper,overflow tank,and clinker crusher 1 ea 25.5 3 1.3 9.8
Part of clinker crusher sump system/LP water-Unit 1 1 ea 59.8 4 5.3 39.6
Part of clinker crusher sump system/LP water-Unit 2 1 ea 66.8 4 5.9 44.2
Part of clinker crusher sump system/LP water-Unit 4 1 ea 69.5 4 6.1 46.0
Part of clinker crusher sump system/LP water-Unit 5 1 ea 72.3 4 6.39 47.8
SFC sump pump to SFC 1 ea 146.7 6 29.4 220.2
4"hose from pump to pipe 1 ea 19.8 _ 4 1.7 12.9
Pipes dumping SFC BA into surge tank 1 ea 57.6 18 101.8 761.7
Miscellaneous pipe to SFC tank-unable to identify 1 ea 216.6 8 75.6 565.6
Total Piping Volume 1 LOT 94,582.2

111
�
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