NC0003425_Modification_20201231

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ROY COOPER 9
Governr,t
MICHAEL S. REGAN .
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Secretory .��ns,r'
S.DANIEL SMITH NORTH CAROLINA
Director Environmental Quality
January 04, 2021
Duke Energy Progress, LLC.
Attn: Tom Copolo, General Manager
10660 Boston Road
Roxboro, NC 27574
Subject: Permit Modification
Application No. NC0003425
Roxboro Steam Electric Power Plant
Person County
Dear Applicant:
The Water Quality Permitting Section acknowledges the December 31, 2020 receipt of your permit modification application
and supporting documentation. Your application will be assigned to a permit writer within the Section's NPDES WW
permitting branch. Per G.S. 150B-3 your current permit does not expire until permit decision on the application is made.
Continuation of the current permit is contingent on timely and sufficient application for renewal of the current permit. The
permit writer will contact you if additional information is required to complete your permit renewal. Please respond in a
timely manner to requests for additional information necessary to allow a complete review of the application and renewal
of the permit.
Information regarding the status of your renewal application can be found online using the Department of Environmental
Quality's Environmental Application Tracker at:
https://deq.nc.gov/permits-regulations/permit-guidance/environmental-application-tracker
If you have any additional questions about the permit, please contact the primary reviewer of the application using the
links available within the Application Tracker.
Sincerely,
KI2lYl- I
Wren Thedford
Administrative Assistant
Water Quality Permitting Section
ec: WQPS Laserfiche File w/application
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DUKERoxboro Steam Station
>. - 1700 Dunnaway Roe()" ENERGY®
Semora,NC 27343
12520-B December 10, 2020
Sergei Chernikov, PhD,
Industrial Permitting Branch
NC Division of Water Resources
1617 Mail Service Center RECEIVED
Raleigh, NC 27699-1617 DEC 31 2020
Subject: NPDES Permit Modification Request NCDEQ/DWR/NPDES
Roxboro Steam Station
NC0003425
Person County
Dear Dr. Chernikov,
Duke EnergyProgress,LLC (Duke Energy) hereby requests modification of the subject NPDES permit
to make the following changes:
1. Duke Energy requests incorporation of updated provisions and technology based effluent
limits (TBEL) provided in 40 CFR part 423. Specifically, Duke Energy requests that the FGD
TBELs be updated to the values in the recently promulgated steam electric effluent limitations
guidelines and that terms related to the release of bottom ash transport water be clarified to align
with updates to 40 CFR Part 423. The revised rule was signed by the US Environmental
Protection Agency (EPA) on August 31, 2020 and published in the Federal Register on October
13, 2020 with a December 13, 2020 effective date. The rule states that "Where permits with the
2015 rule limitations have already been issued, EPA expects that the final rule requirements will
be incorporated through permit modifications in most cases."
Those promulgated limits are as follows with changes from current permit limits
highlighted:
Pollutant Existing monthly average and Requested 2020 monthly
daily max average and daily max
Arsenic 8 ug/I and 11/ug/I 8 ug/I and 18 ug/I
Mercury 356 ng/I and 788 ng/I 34 ng/I and 103 ng/I
Selenium 12 ug/I and 23 ug/I 19 ug/I and 70 ug/I
Nitrate/Nitrite 4.4 mg/I and 17 mg/I 3 mg/I and 4 mg/I
If necessary, Duke Energy will work with the Department to develop a narrative permit requirement to
assure that treatment components in place continue to be properly operated and maintained to provide
optimum treatment. The permit currently contains such a requirement stating "the facility shall continue
to operate the FGD treatment system until all coal-fired units are retired" as a footnote in condition
A.(10).
www.duke-energy.com

2. With the update to the FGD TBEL's,Duke Energy also requests phased limits for outfall
011 based on the attached combined waste formula calculations. Duke Energy intends to
redirect landfill leachate to the FGD wastewater system to promote increased pollutant removal.
Given the amount of work necessary to redirect this flow, the redirection of landfill leachate
cannot occur until 2022 at the earliest. Duke Energy requests that phased limits for FGD
wastewater be included in the permit with limits at outfall 011 for"FGD wastewater
without landfill leachate"and "FGD wastewater with landfill leachate". Supporting
information with the calculations for the combined flow limits were performed by Stantec
engineering and can be found in Attachment 1 to this submittal.
3. Duke Energy requests an increase in the flow limit and reporting clarification on flow at
internal Outfall 002 during dewatering activities. The daily maximum flow limit from the
dewatering system currently is 2.0 MGD daily maximum. However, the flow at outfall 002 is
influenced by a large drainage area during rain events. Duke Energy requests that the flow limit
be increased to 3.0 MGD and expressed as a monthly average similar to the flow requirement at
our Belews Creek facility. Additionally, the permit currently clearly states that this flow limit is
applicable to interstitial water only but does not provide a mechanism to report that data and
demonstrate compliance. Duke Energy requests , since the interstitial water flow is only a
portion of the flows measured at internal outfall 002,that a requirement to provide interstitial
water flow rates be included in the permit. This flow information could be input in the eDMR
with a different identifying internal outfall number for flow only or through some other reporting
mechanism.
4. Duke Energy requests "bottom ash purge water"be added as a contributing waste stream
to the lined retention basin. The bottom ash purge water is produced by the blow down from
the submerged flight conveyors (SFC) bottom ash handling system. Based on our operating
experience, intermittent releases from the high recycle bottom ash system are necessary to ensure
proper water chemistry and water balance are managed according to best engineering practices.
The bottom ash purge flow would be no more than 10% of SFC water volume and routine purge
would be directed to the FGD makeup system when available. In accordance with the federal
effluent guideline rule, a 30-day rolling average SFC purge water flow volume of 0.099 MGD is
requested to be added to the permit based on a calculated bottom ash system volume of 0.995
million gallons. Duke Energy requests that this be added as a special condition.
5. Duke Energy requests removal of the phrase that reads "During the period beginning on the
effective date of this permit and lasting until the completion of the removal of coal combustion
residuals from the East Ash Basin Extension, but no later than December 31, 2021, the
Permittee is authorized to discharge from Outfall 001"in permit condition A.(1). This
appears to be a remnant from a much earlier DRAFT of the permit. Given that the permit was
issued in 2020, the remaining ash will not be fully excavated from the east ash basin remnant by
the end of 2021. Additionally, industrial stormwater from the landfill will continue to be
released through the channel for outfall 001 as that is the only way water can drain based on
topography. Required ash excavation from this area is currently planned to be completed in
2022. Duke Energy requests that this note be removed.

6. Duke Energy requests condition A.(18) be modified to change the Monthly Instream
Monitoring location name be from 6B to F2.The sampling location is the same with the
naming convention being updated.
A check in the amount of$1,030 is included with this submittal to cover the required permit
modification fee. Should you have any questions about this request please feel free to contact Ms. Lori
Tollie at [phone].
Sincerely,
Tom Copolo
Roxboro General Manager
Cc: Shannon Langley via email
Robert Howard
Lori Tollie/FileNet—via email

Stantec
Roxboro Leachate Treatment
Assessment Report
Revision 1
November 20, 2020
Prepared for:
Duke Energy Corporation
Prepared by:
Stantec Consulting Services Inc.

Revision Description Author Quality Check Independent Review
A Draft MAG 6/18/20 AS/WMK 6/22/20 MN/RR 6/23/20
0 Final MAG 7/15/20 AS/WMK 7/17/20 MN/JP 7/17/20
Revision
1 ELG Update WMK 11/17/20 AS 11/18/20 MN 11/18/20
® I

ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
This document entitled Roxboro Leachate Treatment Assessment Report was prepared by Stantec
ConsultingServices Inc. "Stantec" for the account of Duke Energy (the"Client"). Anyreliance on this
("Stantec") )
document by any third party is strictly prohibited. The material in it reflects Stantec's professional judgment in
light of the scope, schedule and other limitations stated in the document and in the contract between Stantec
and the Client. The opinions in the document are based on conditions and information existing at the time the
document was published and do not take into account any subsequent changes. In preparing the document,
Stantec did not verify information supplied to it by others.Any use which a third party makes of this document
is the responsibility of such third party. Such third party agrees that Stantec shall not be responsible for costs
or damages of any kind, if any, suffered by it or any other third party as a result of decisions made or actions
taken based on this document.
Prepared by
(signature)
Mayra A. Giraldo
Reviewed by
(signature)
Bill Kennedy, PE
Approved by
(signature)
Matt Newhart, PE

ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
Table of Contents
EXECUTIVE SUMMARY I
ABBREVIATIONS II
1.0 INTRODUCTION 1.1
2.0 LANDFILL LEACHATE SYSTEM REVIEW 2.1
2.1 LEACHATE DATA REVIEW AND WATER CHARACTERIZATION 2.1
2.2 LEACHATE SYSTEM HYDRAULICS REVIEW 2.3
3.0 FGD WASTEWATER TREATMENT SYSTEM REVIEW 3.5
3.1 FGD WASTEWATER TREATMENT CHARACTERIZATION 3.5
3.2 FGD WASTEWATER TREATMENT CAPACITY ANALYSIS 3.6
4.0 NPDES PERMIT REVIEW 4.8
4.1 LEACHATE 4.10
4.2 DEWATERING 4.10
4.3 VARIABLE FGD FLOW 4.11
5.0 ASH BASIN WATER CONVEYANCE REVIEW 5.12
6.0 CONCLUSIONS AND RECOMMENDATIONS 6.14
7.0 REFERENCES 7.15
LIST OF TABLES
Table 2-1 Leachate Tanks Effluent Summary 2.2
Table 2-2 Leachate Analytical Data Summary 2.3
Table 3-1 FGD Wastewater Treatment Sampling Results -Average 3.6
Table 3-2 Operating Scenarios 3.6
Table 3-3 FGD WWT Capacity Analysis 3.7
Table 4-1 2015 ELG Limits 4.9
Table 4-2 CWF Results 700 gpm FGD + 65 gpm Leachate 4.10
Table 4-3 CWF Results 700 gpm FGD + 65 gpm Leachate + 110 gpm Dewatering 4.10
Table 4-4 CWF Results 700 gpm FGD + 65 gpm Leachate + 360 gpm Dewatering 4.11
Table 4-5 CWF Results 700 gpm FGD + 65 gpm Leachate + 900 gpm Dewatering 4.11
Table 5-1 Class 5 Opinion of Probable Total Installed Cost 5.14
LIST OF FIGURES
Figure 2-1 Existing Landfill Leachate Flow 2.1
Figure 2-2 Leachate and FGD Blowdown Piping 2.4
Figure 3-1 Wastewater Treatment Simplified Process Flow Diagram 3.7
Figure 5-1 Ash Basin Dewatering to Leachate Tanks 5.13

ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
LIST OF APPENDICES
Appendix A FGD Wastewater Treatement Analytical Results A.1
Appendix B FGD Wastewater Treatment System Process Units Details B.2

ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
Executive Summary
This report assessed the opportunity to use the existing Flue Gas Desulfurization (FGD)Wastewater
Treatment System (WWTS) at the Duke Energy Roxboro Facility to treat the recovered leachate from coal
the site landfill.Additionally, this report evaluated the option of conveying dewatered flows from the West
and East Ash Basin through the FGD WWTS and the effects to the existing National Pollutant Discharge
Elimination System (NPDES) Permit NC0003425 for the Roxboro Plant. Revision 1 of this document
incorporates the Best Available Technology (BAT) limits included in the 2020 Revision of the Steam
Electric Generating Effluent Limitation Guidelines.
The FGD WWTS capacity analysis to the physical-chemical and biological system was performed to
evaluate the capacity of the system to treat FGD purge and additional flows such as leachate and
dewatered flows. The flow capacity was developed using the original design basis of 900 gallons per
minute (gpm) up to 1,800 gpm to include FGD purge, leachate, dewatered flows, and internal WWTS
recycled flows. The main conclusions from the capacity analysis were:
• The clarifiers do not present any issues and have enough capacity to handle combined flows
while maintaining redundancy.
• The 1st stage of the biological treatment system is the bottleneck of the system with flows higher
than 1,050 gpm unable to be treated without utilizing all available redundancy or adding additional
units.
• Continuous backwash gravity filters and the 2"d stage of the biological treatment system can
handle combined flows up to 1,350 gpm with all units online resulting in zero redundancy.
Stantec recommends using the existing 8-inch piping from the leachate tanks to the Water Redirect Sump
to convey leachate flows and connect to the old FGD blowdown line to the FGD wastewater settling pond.
Based on the leachate wastewater quality data, flows, and loads, the FGD WWTS can treat the leachate
flows without major modifications to the existing system. Stantec recommends the following:
• Conduct a sampling effort to further validate that the constituents of concern are within the FGD
WWTS basis of design.
• Conduct a sampling effort to collect FGD WWTS quality data to confirm system performance,
including ultrafiltration effluent.
• Control leachate tank effluent as close to the average flow of 65 gpm as possible using a flow
control valve.
The evaluation of treating the dewatered wastewater from the East and West ash basin through the FGD
WWTS suggest that major adjustments and additions to the systems are required in order to treat the
expected flow of 900 gpm. However, some of the changes/additions are subject to change based on
Duke's desire to maintain N+1 redundancy and NPDES permit limitations.

ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
Abbreviations
CBGF Continuous Backwash Gravity Filters
CCR Coal Combustion Residuals
CWF Combined Wastestream Formula
ELG Effluent Limitation Guidelines
EQ Tanks Equalization Tanks
FGD Flue Gas Desulfurization
FRP Fiberglass Reinforced Plastic
gpm Gallons per Minute
HDPE High-density Polyethylene
hp Horsepower
kVA Kilo-Volt-Ampere
Landfill Leachate Leachate
Max Maximum
MGD Million Gallons per Day
mg/L Milligrams per Liter
NCDEQ North Carolina Division of Water Resources
NPDES National Pollutant Discharge Elimination System
O&G Oil &Grease
Phys-Chem Physical Chemical
RDL Reporting Detection Limit
RO Reverse Osmosis
TDS Total Dissolved Solids
TSS Total Suspended Solids
OF Ultrafiltration
WWTS Wastewater Treatment System
pg/L Micrograms per Liter

ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
1 .0 INTRODUCTION
Duke Energy (Duke) currently owns and operates a 2,400-megawatt power generation facility located
near Semora, (Person County), North Carolina. The plant consists of four coal-fired units and began
operation in 1966 with major expansions taking place from 1973 to 1980. Coal combustion residuals
(CCR) have been managed on-site and include the operation of a landfill leachate recovery system. CCR
materials placed within the existing landfill include fly ash, bottom ash, and gypsum.
The Flue Gas Desulfurization (FGD)wastewater treatment system (WWTS)was recently constructed as
an upgrade from the previous system to comply with the CCR rule and new permit requirements. Since
construction, the FGD WWTS has had limited operations since start up in early 2020. The FGD WWTS
consists of physical-chemical (phys-chem)treatment and biological treatment followed by ultrafiltration
(UF). Duke has identified an opportunity to use the existing FGD WWTS as a possible treatment system
for both exiting FGD flows and recovered leachate from combustion residuals management.
This report presents the results of the evaluation, reviewing the capacity and capability of the FGD WWTS
to treat the leachate flows. In addition, this report includes an evaluation of conveying dewatered flows
from the West and East Ash Basins for treatment through the FGD WWTS.
2.0 LANDFILL LEACHATE SYSTEM REVIEW
Landfill leachate (leachate) is collected in the leachate pump station and conveyed to two 370,000-gallon
leachate equalization tanks. The equalized flow is then pumped, via two 10 horsepower(hp) pumps (one
standby), through a forced main to the Water Redirect Sump before it is sent to the Lined Retention Basin
and discharge through Outfall 12B as shown in Error! Reference source not found..
Leachate Equalization . Outfall 12B
Leachate Tanks Water Redirect Sump Lined Retention
370,000gal Leachate Tanks Basin
2 Tanks Discharge
Figure 2-1 Existing Landfill Leachate Flow
2.1 LEACHATE DATA REVIEW AND WATER CHARACTERIZATION
Leachate data provided by Duke was reviewed to assess the preliminary loads and flows that will be sent
to the existing FGD WWTS. The leachate flows and loads were used to develop a FGD WWTS capacity
analysis discussed in Section 3.0 and used in the combined wastestream formula (CWF)for the National
Pollutant Discharge Elimination System (NPDES) permit discussion in Section 4.0. The data used to
analyze the leachate were:
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ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
• Leachate flow data from September 2019 to April 2020
• Leachate analytical data for two sampling events:April and November 2019
• Leachate system P&IDs
The leachate effluent tank data set was analyzed using an 8, 12, and 24-hour moving average for the
flows with and without (only when the pumps are running) instances of zero flow to review the system
trends over the different time periods. Based on the flow analysis, shown in Table 2-1, 50 gallons per
minute (gpm) is the average effluent flow; however, from Duke's input, 65 gpm will be the expected
average leachate flow to be sent to the FGD WVVfS.
Table 2-1 Leachate Tanks Effluent Summary
Tank Flow Discharge(GPM)
Date 8-hr average 12-hr average 24-hr average
Average Max Average Max Average Max
April-19 - - - - - -
May-19 - - - - - -
June-19 - - - - - -
July-19 - - - - - -
August-19 - - - - - -
September-19 56.2 356 55.9 238 55.8 119
October-19 49.9 240 50.1 160 50.6 80.0
November-19 47.4 231 47.2 154 46.9 77.0
December-19 40.0 235 40.2 157 40.7 78.5
January-20 45.4 240 45.7 160 45.9 80.3
February-20 54.1 255 54.2 170 54.2 129
March-20 53.0 230 52.8 154 52.7 76.8
April-20 53.0 240 52.4 160 51.4 116
Average 49.9 253 49.8 169 49.8 94.6
1. Table represents averages including instances of zero flow
The analytical data provided on Table 2-2 shows the constituents of concern. The analytical results
appear to be within the design basis of the FGD WVVTS as shown in Section 3.0Table 2-2. However, this
conclusion is based on only two sampling events; therefore, it is recommended to conduct further
sampling to more accurately characterize the leachate.
Cil
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ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
1 Table 2-2 Leachate Analytical Data Summary
Parameter Unit Average Max Min
Sulfate mg/L 2,100 2,200 2,000
i Nitrate as N mg/L 6.95 11.0 2.90
Nitrate mg/L 30.0 47.0 13.0
Fluoride mg/L 3.15 5.00 1.30
Chloride mg/L 460 480 440
Mercury (Hg) pg/L 0.05001 0.05001 0.05001
Total Zinc(Zn) mg/L 0.0380 0.0420 0.0340
Total Nickel (Ni) mg/L 0.0650 0.0670 0.0630
Total Manganese (Mn) mg/L 1.405 1.44 1.37
Total Iron (Fe) mg/L 0.307 0.466 0.148
Total Copper(Cu) mg/L 0.005001 0.005001 0.005001
Total Chromium (Cr) mg/L 0.0215 0.0300 0.0130
Total Boron (B) mg/L 41.4 43.5 39.3
Total Barium (Ba) mg/L 0.0380 0.0380 0.0380
Total Thallium (TI) Low Level pg/L 0.4515 0.703 0.2
Total Silver(Ag) pg/L 1.00 1.00 1.00
Total Selenium (Se) pg/L 573 666 479
Total Lead (Pb) pg/L 1.001 1.001 1.001
Total Cadmium (Cd) pg/L 1.925 2.06 1.79
Total Arsenic(As) pg/L 5.33 5.46 5.19
TDS mg/L 2731 4970 492
1. Reporting detection limit (RDL)
2.2 LEACHATE SYSTEM HYDRAULICS REVIEW
Stantec has evaluated two options for the conveyance of recovered leachate. Initially, it was considered
to send the leachate flow directly to the FGD WAITS sump; however, this option would require the
installation of new pipe to convey the leachate; potentially increasing capital cost. The option
recommended is to use the existing 8-inch pipe, originally used to convey FGD blowdown to the FGD
settling ponds to transfer the leachate to the FGD blowdown tanks.
Prior to the installation of the new FGD WWTS, the FGD blowdown was conveyed to the FGD wastewater
settling pond through an 8-inch fiberglass reinforced plastic(FRP) pipe. Currently, leachate tank effluent
is conveyed through an 8-inch high-density polyethylene (HDPE) pipe to the water redirect sump, which is
in close proximity to the old FGD blowdown pipe, as shown in Error! Reference source not found.2.
The proximity of the pipes provides an opportunity to tie both lines together to convey leachate to the
FGD blowdown tanks.
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l

ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
I
Li f —.
Slowdown
u " . Tanks
4414/6.0... -, . .111.4 c -+rR
" Proposed TP p,.oak
M .
Water ` ,,fa
w ., ' am.,�. Redirect �w�.
,... I Sump i+i�
Oldso : �4 .� �,r
line ass. ' �v ;
` � � � '' leachate �
',r0::: ::-Z...",14,-'12*•''' :
-ram • J
.' Tanks :'
�rrr 0 m}
".'
tc s
1"1011410►0,
Figure 2-2 Leachate and FGD Blowdown Piping
To confirm hydraulic capacity to convey leachate from the leachate tanks to.the FGD blowdown tanks, a
preliminary hydraulic analysis was conducted using AFT Fathom 10 modeling software. A summary of
inputs and assumptions for the hydraulic model are shown in Table 2-3.
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ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
Table 2-3 Leachate Pump Hydraulic Analysis Assumptions
Input Assumption
Leachate Tank and Effluent Pumps Base Elevation 490 feet
FGD Blowdown Top of Tank Elevation 471 feet
Pipe Size and Material 8" Stainless Steel (pump station), 8" double-
walled fusion-bonded HDPE (from pump station
to water redirect sump), 8" FRP (from water
redirect sump to FGD blowdown tanks)
Because of the drop in elevation, the hydraulic model indicates that gravity flow will be possible between
the leachate tanks and the FGD blowdown tanks. Depending on the liquid level in the leachate tanks,
flow rates will vary from 500 gpm to 750 gpm if uncontrolled. The addition of a flow control valve on the
leachate pump bypass and upstream of the existing leachate flow meter(FE-2002)would be required to
control the flow of leachate into the FGD blowdown tanks.
If additional hydraulic capacity is required to convey ash pond dewatering flows, the existing leachate
tank effluent pumps would need to be utilized. Depending on tank level and pump speed, the pump
capacity ranges from 500 gpm to 950 gpm when utilizing the existing 8-inch piping.
3.0 FGD WASTEWATER TREATMENT SYSTEM REVIEW
3.1 FGD WASTEWATER TREATMENT CHARACTERIZATION
The FGD WVVfS phys-chem, biological, and ultrafiltration treatment units began commissioning early
2020. Duke provided analytical data from four sampling events(February 13, 26, March 10, 24, 2020)to
evaluate the overall system performance. Table 3-1 presents a summary of the primary constituents of
concern. A detailed data tabulation may be found in Appendix A. Based on the data shown in Table 3-1,
the system has not achieved the guaranteed selenium concentration in the effluent; however, only three
data points were provided, and the most recent data point shows a 2 parts per billion (ppb) selenium
concentration.
The influent constituent concentrations are within the limits of the FGD WVVTS basis of design. Based on
the leachate analytical data presented in Section 2.2, the concentration of the constituents of concern are
not a concern to FGD VVWTS performance. Therefore, co-mingling leachate wastewater is not anticipated
to have negative effects on the quality of the influent to the FGD WWTS. Due to the FGD VVWTS limited
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ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
data set, it is recommended to continue sampling when the plant is continuously running and the OF
system is online.
Table 3-1 FGD Wastewater Treatment Sampling Results -Average
Design Phys- Sys
Influent Purge EQ Tank Chem Effluent
Per GE Effluent Bio
•
Nitrate-Nitrite as N mg/L 50 21.7 16.4 14.2 0.334
Arsenic pg/L 1,300 443 266 2.52 2.08
Mercury pg/L 1,000 44.1 25.7 11.1 0.577
TDS mg/L 30,000 7,664 N/A N/A N/A
TSS mg/L 7,500 N/A N/A N/A 5.00
Selenium, Total pg/L 5,500 595 415 216 52.0
Selenium, Dissolved pg/L 5,500 461 226 186 58.0
MeSe(IV) pg/L N/A 7.00 1.75 1.75 1.75
Se(IV) pg/L 5,500 22.2 12.5 12.7 9.57
Se(VI) pg/L 5,500 273 211 221 26.1
COD mg/L I 600-1,100 N/A 664 154 285
3.2 FGD WASTEWATER TREATMENT CAPACITY ANALYSIS
A capacity analysis performed of the FGD WWTS unit operations to evaluate the capability to process
additional wastewater. The various flow scenarios used for this analysis are shown in Table 3-2 and the
block diagram depicting the flow through the overall process is shown in Figure 3-1 Wastewater
Treatment Simplified Process Flow Diagram
Table 3-2 Operating Scenarios
Operating Scenarios Flow(gpm)
Leachate Effluent 65
FGD Purge 700
Ash Pond Dewatering 900
Recycle Flows to EQ 125
FGD + Leachate+ Recycle Flows 890
FGD + Leachate + Dewatering + Recycle Flows 1,790
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ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
22-Stage 1 ABMet
22-29k gal Working Volume
Slowdown Tanks
142,600 1 EQTanks lnf EQ Tanks 7
2Tanks 650Tan gal I i/\ /�
Scrubber Purge 2Tanks 2-Clarifiers /�<
892,000 gal
•
4-Uf Membrane
0.02Micron
Ihn Tanks A-C 4-SandP,lters 14-Stage 2 ABMet
leachate I Other Flows l 1.8-4.9gpm/ft2 22-29k gal Working Volume
- Leachate Tanks
370,000 gal
-Dewatering • 2Tanks
Potential Flow
Figure 3-1 Wastewater Treatment Simplified Process Flow Diagram
The capacity analysis conducted on the main FGD VVVVTS units: clarifiers, continuous backwash gravity
filters (CBGF), and biological system considering the maximum flow they can treat per surface area
available(flux, gpm/ft2). As shown in Table 3-2, the combined average FGD and leachate flow are within
the treatment capacity of the VVVVTS. However, if the dewatering flow is combined with the FGD purge
and leachate, it results in a flow greater than the FGD VVVVTS can effectively process.
To determine a maximum theoretical flow rate for the VVVVTS, different flow rates were evaluated to
confirm the maximum treatment capacity of each primary FGD VVVVTS unit operation. The analysis was
performed both maintaining N+1 redundancy and utilizing the redundant capacity of the system. A
summary of findings is shown in Table 3-3. Refer to Appendix B for detailed information regarding
technical specifications for each of the units.
Table 3-3 FGD WWT Capacity Analysis
Flows (gpm)
Treatment Units Max Flux 1
(gpm/ft2) 9002 1050 1100 1125 1250 1300 1350 1650 1800
Clarifier(1) 0.50 0.25 0.29 0.30 0.31 0.34 0.36 0.37 0.45 0.49
Clarifier(2)3 0.50 0.13 0.15 0.15 0.16 0.17 0.18 0.19 0.23 0.25
CBGF (3) 4.5 4.0 4.6 4.9 4.9 5.5 5.7 6.0 7.3 7.9
CBGF (4)3 4.5 3.0 3.5 3.7 3.7 4.1 4.3 4.5 5.5 5.9
1st Stage Bio (21) 0.75 0.65 0.76 0.79 0.81 0.90 0.94 0.97 1.19 1.30
1st Stage Bio (22)3 0.75 0.62 0.72 0.76 0.77 0.86 0.90 0.93 1.14 1.24
2nd Stage Bio (13) 1.46 1.05 1.22 1.28 1.31 1.46 1.52 1.57 1.92 2.10
2nd Stage Bio(14)3 1.46 0.97 1.14 1.19 1.22 1.35 1.41 1.46 1.79 1.95
1. Max flux was calculated from technical specs provided in the FGD VVVVTS P&IDs
2. Max design flow for FGD VVVVTS
3. No redundancy
4. Highlighted values are above the maximum calculated flux
The main conclusions from the capacity analysis are:
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ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
• The clarifiers do not present any issues and have enough capacity to handle the combined flows
while maintaining the N+1 redundancy.
• The CBGF can handle up to 1,350 gpm with all units online resulting in zero redundancy. To
maintain an N+1 redundancy with the number of existing units, a max flow of 1,050 gpm is
acceptable. However, the CBGF can operate with a flux of up to 4.9 gpm/ft2.
• The 1st stage of the biological treatment system is the bottleneck for increasing flow. Depending
on nitrate levels coming from the leachate and other flows, the 1st stage biological system may be
able to handle a higher flux to an approximate flow of 1250 gpm; however, it will result in zero
redundancy.
• The 2nd stage biological can process a flow of up to 1,350 gpm with all units online and zero
redundancy.
• Chemical consumption is expected to linearly increase with the flow through the WWTS.
4.0 NPDES PERMIT REVIEW
On 29 May 2020, the North Carolina Division of Water Resources, Department of Environmental Quality
(NCDEQ), issued the Final NPDES Permit Renewal, NC0003425, for Roxboro Station. The permit has
three outfalls relevant to this study: Internal Outfall 002 (Ash Pond Treatment System); Internal Outfall
011 (New FGD Treatment System); and Internal Outfall 012B (Lined Retention Basin).
Outfall 002 covers the dewatering of the ash ponds in two phases. The first, decanting of the free water
above the settled ash layer that does not involve mechanical disturbance of the ash, is treated as a
typical low volume wastestream, with limits only for oil &grease(O&G) and total suspended solids (TSS),
along with monitor and reporting requirements for flow, As, Mo, Se and pH. The second phase, removal
of interstitial water, is flow limited to 2.0 million gallons per day (MGD, -1389 gpm)with the same low
volume wastestream limits and expanded monitor and report requirements for Se, As, Hg, Mo, Sb, Cu,
and pH.
Outfall 011 covers the newly installed FGD WWT system. The permit limits TSS and O&G as a low
volume wastestream.As, Hg, Se and nitrate/nitrite are treated in compliance with the 2015 revision to the
Steam Electric Generation Effluent Limitation Guidelines (ELG). The permit, in Note 2 for Outfall 011,
indicates that compliance sampling shall occur following the bioreactor, apparently discounting the
presence of the UF system. It is assumed that this is an artifact from the previous permit and not picked
up by NCDEQ during the review cycles. It is recommended that this note be clarified with NCDEQ to
definitively include UF operations as part of the treatment system. Note 3 indicates that limits for As, Hg,
Se and nitrate/nitrite do not become effective until December 31, 2021.
Outfall 012E covers the newly installed Lined Retention Basin. The permit limits TSS and O&G as a low
volume wastestream along with monitor and report for ammonia, As, Se, Hg and pH.
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ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
The design basis for the new FGD WWT is to achieve 80 percent of the 2015 ELG monthly average limits
for As, Hg, Se and nitrate/nitrite as shown in Table 4-1. When evaluating the addition of unregulated
non-FGD wastestreams to the treatment system, the ELGs mandate the use of the CWF to calculate
modified limits for the various regulated constituents. The CWF is simply a mass balance, defining the
new concentration-based limits on the allowable mass loading of the regulated stream divided by the
combined flow of the streams. Flows are generally defined as the average daily flow, of at least a 30-day
average. For the purpose of this study, 700 gpm (1.01 MGD) is used as the long-term average daily flow 1
of the FGD purge stream.
Table 4-1 2015 ELG Limits and FGD WWT Design Basis
80% of 2015 GE/Suez FGD WWT
2015 ELG Limit Limit
Design Basis Requirements
Units Monthly Daily Monthly Expected Value
Average Maximum Average
TSS1 mg/L 30 100 30 <_20.0
Oil and Grease' mg/L 15 20 15 -
Total Arsenic pg/L 8 11 6.4 <_6.0
Total Mercury ng/L 356 788 285 <_95
Total Selenium pg/L 12 23 9.6 <_ 10
Nitrate/Nitrite as N mg/L 4.4 17 3.5 <_ 3.5
1. Not included in the 2015 ELG limits
On 13 October 2020, EPA revised the ELG BAT limits for FGD, 40 CFR Part 423. These revised limits
are reflected in Table 4-2. Arsenic and selenium monthly limits remain within the design basis of the FGD
WWTS. 1
Table 4-2 2020 ELG Limits and FGD WWT Design Basis
80% of 2015 GE/Suez FGD WWT
2020 ELG Limit Limit
Design Basis Requirements
Units Monthly Daily Monthly Expected Value
Average Maximum Average
TSS1 mg/L 30 100 30 <_20.0
Oil and Grease' mg/L 15 20 15 -
Total Arsenic pg/L 8 18 6.4 <_6.0
Total Mercury ng/L 34 103 285 <_95
Total Selenium pg/L 29 70 9.6 <_ 10
Nitrate/Nitrite as N mg/L 3 4 3.5 <_ 3.5
1. Not included in the 2020 ELG limits
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ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
4.1 LEACHATE
The CWF was used to calculate likely permit limits for the combined regulated FGD wastestream
(700 gpm) and the unregulated leachate stream (65 gpm). Daily average flows were used to calculate the
limits for the monthly average and daily maximum based of the 2020 FGD limits. The CWF results are
shown in Table 4-3.
Table 4-3 CWF Results 700 gpm FGD+ 65 gpm Leachate
Units Monthly Daily
Average Maximum
TSS mg/L 30 100
Oil and Grease mg/L 15 20
Total Arsenic µg/L 7.3 16.5
Total Mercury ng/L 31 94
Total Selenium µg/L 26.5 64.1
Nitrate/Nitrite as N mg/L 2.8 3.7
4.2 DEWATERING
The CWF was used to calculate likely permit limits when adding the unregulated Ash Basin Dewatering
flow to the combined regulated FGD wastestream (700 gpm) and the unregulated leachate stream (65
gpm). Daily average flows were used to calculate the limits for the monthly average and daily maximum
based of the 2020 FGD limits, Table 4-4. Using the CWF to determine how much dewatering flow would
be allowed to maintain 23.2 ppb Se (target of 80% of 2020 ELG limit) concentration in the effluent yields
110 gpm.
Table 4-4 CWF Results 700 gpm FGD+ 65 gpm Leachate+ 110 gpm Dewatering
Units Monthly Daily
Average Maximum
TSS mg/L 30 100
Oil and Grease mg/L 15 20
Total Arsenic µg/L 6.4 14.4
Total Mercury ng/L 27 82
Total Selenium µg/L 23.2 56.0
Nitrate/Nitrite as N mg/L 2.4 3.2
A 110 gpm dewatering flow rate is well below the anticipated 900 gpm flow targeted for ash basin
dewatering requirements. Reviewing the equipment capacity bottlenecks in Table 3-3, yields a net
potential available capacity of 1250 gpm gross internal flow, 1125 gpm net flow, with 360 gpm available
for dewatering. Table 4-5 shows the likely limits for the maximum flow before additional equipment would
need to be added to debottleneck the WWTS.
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ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
Table 4-5 CWF Results 700 gpm FGD+65 gpm Leachate+ 360 gpm Dewatering
Units Monthly Daily
Average Maximum
TSS mg/L 30 100
Oil and Grease mg/L 15 20
Total Arsenic µg/L 5.0 11.2
Total Mercury ng/L 21 64
Total Selenium µg/L 18.0 43.6
Nitrate/Nitrite as N mg/L 1.9 2.5 I
Assuming all flow needs from ash basin dewatering could be accommodated, 900 gpm, by FGD WWTS,
in addition to leachate, the CWF results in the limits show in Table 4-6
Table 4-6 CWF Results 700 gpm FGD+65 gpm Leachate+ 900 gpm Dewatering
Units Monthly Daily
Average Maximum
TSS mg/L 30 100
Oil and Grease mg/L 15 20
Total Arsenic L 3.4 7.6
µg/
Total Mercury ng/L 14 43
Total Selenium µg/L 12.2 29.4
Nitrate/Nitrite as N mg/L 1.3 1.7
4.3 VARIABLE FGD FLOW
The highly variable nature of FGD purge flow due to low utilization of the generating units and seasonal
demand, raises the question of what actually is the appropriate regulated flow to use in a concentration
based calculation using the CWF. What limits would be imposed and would they be impractically onerous
so as to preclude the treatment of the unregulated wastestreams of leachate and ash basin dewatering
flows need to be considered.
The assumed intent of adding these unregulated wastestreams to the influent of FGD WWTS is to further
reduce the mass loading of Se to Hyco Lake. Although Se is not specifically limited in the leachate and
dewatering flows, the additional reduction in Se mass load to Hyco Lake can only be of benefit. As such,
the use of mass-based limits, rather than concentration-based limits may be more appropriate for Outfall
011. Using the 900 gpm design basis flow for FGD WWTS and the 2020 ELG based Se limit of 29 pg/L,
would yield a monthly mass loading limit of 4.28 kilograms.
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ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
CONVEYANCE5.0 ASH BASIN WATER EV
Duke is considering the possible redirection of dewatering flow from the East and West basin to the
leachate tanks and from there to the existing FGD WWTS. The flows considered by Duke for these
scenarios are an average flow of 650 gpm and peak flow of 900 gpm. Water characterization data for the
dewatered flow was not provided; therefore, the analysis performed was only based of the hydraulic
capacity of the existing process equipment. Based on the capacity analysis of the existing FGD WWTS
process shown in Section 3.2, the treatment system can operate with flows as high as 1,050 gpm (160
gpm of dewatering flow)while maintaining the N+1 redundancy. However, to properly process flows up to
1,350 gpm (460 gpm of dewatering flow)the spare units will need to operate without redundancy. To
process the full average dewatering flow, additional FGD WWTS process equipment would need to be
installed. To make treatment of the dewatering flow more feasible, a volume reduction technology, such
as reverse osmosis (RO), could be evaluated.
The proposed pipe routing and electrical tie-in for a conveyance system from the ash basin to the
leachate tanks is shown in Error! Reference source not found..
CIO
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ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
Slowdown .
:. ',.. Tanks
� r.'"�
z
4x5 4 i xw Yr,
; Proposed TP r a
, E Water »#4 ,, 1
♦\ . .,.,4, V ' 440,0:,. I f , lovo,,, T
Sump S
�m g $ '. Leachate
Tanks
J -1,
902•;*,,... ri
„,,,6 1
, ,
„,,,,,, .,:.:,
ti J k
....
Proposed ,, �'": tArr rrorr
Electrical Tie-in
1 • liclicil\
to7.\\•
94
.,fir'°ef
,. .
- . , .,,.._---- -
Figure 5-1 Ash Basin Dewatering to Leachate Tanks
A Class 5 (-50%to+100%)opinion of probable total installed cost for the dewatering conveyance system
was generated using Aspen In-Plant Cost Estimator v10.1 and is summarized in Table 5-1. No
contingency has been added to the opinion of probable cost.
For the basis, it is assumed that two electric motor driven self-priming pumps will be installed on a
concrete foundation next to the ash pond for dewatering. They will be powered by a local 150 kilo-volt-
ampere (kVA)transformer, powered via aboveground cabling and conduit. The 8-inch double-walled and
fusion-bonded HDPE to the leachate tanks would be run laying on the ground and unsupported.
00
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ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
Table 5-1 Class 5 Opinion of Probable Total Installed Cost
Opinion of Probable Installed
Item Quantity Cost
75 HP Dewatering Pumps, Concrete Pump 2 Pumps $131,000
Foundation
8-inch aboveground Double-Walled Fusion 9,228 feet $420,000
Bonded DR17 HDPE Pipe, Leachate Tank tie-in
Electrical Cable, Ground Cable, Aboveground 4,275 feet $178,000
Galvanized Conduit
150 kVA 480V Transformer, Disconnect Switch
1 Transformer $32,000
Underground Concrete Duct Bank
4,275 feet $227,000
$868,000
Total
6.0 CONCLUSIONS AND RECOMMENDATIONS
Based on findings of this evaluation and discussions with Duke, the FGD WWTS can likely treat the
leachate flows without modifications to the existing FGD WWTS and minor modifications to the leachate
system. This evaluation recommends the following efforts to be executed:
• Conduct sampling to collect leachate quality data to validate that the constituents of concern are
within the FGD WWTS basis of design.
• Conduct sampling to collect FGD WWTS quality data to confirm system performance, including
OF effluent.
• Control leachate tank effluent as close to the average flow of 65 gpm as practical using a flow
control valve.
The evaluation of treating the dewatered wastewater from the East and West ash basin through the FGD
WWTS suggest that major adjustments and additions to the systems are required in order to treat the
expected flow of 900 gpm. However, some of the changes/additions are subject to change based on
Duke's desired to maintain N+1 redundancy and NPDES permit limitations. Based on our evaluation,
1,350 gpm through the FGD WWTS can be treated with additional units of operation to maintain N+1
redundancy with the increased flow. Some of the adjustments recommended to the FGD WWTS to
maintain the N+1 redundancy and increase the capability of treat dewatered flows are:
• Conduct sampling to collect quality data for the dewatered flows.
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ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
• Addition of one (1) CBGF.
• Addition of five (5) biocell reactors to the 1st stage biological system to meet the design flux rate
and keep N+1 redundancy.
• Addition of one (1) biocell reactors to the 2nd stage biological system to maintain the N+1
redundancy.
• Use of volume reduction technology for dewatering flows such as RO.
• Add nutrient to filtrate sump to increase de-nitrification in physical-chemical process and reduce
load on the 1st stage biological treatment.
7.0 REFERENCES
1. NPDES Permit: NC003425 dated 5/29/2020
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ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
Appendix A FGD Wastewater Treatement Analytical Results
APPENDICES

ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
Appendix A FGD Wastewater Treatement Analytical Results
Appendix A FGD WASTEWATER TREATEMENT ANALYTICAL
RESULTS
A.1

Duke FGD WWTS Analytical Data Results
Reports /20020317 /20020317 J20020317 /20020317 /20020317 J20020317 /20020317
Date 2/26/2020 2/26/2020 2/26/2020 2/26/2020 2/26/2020 2/26/2020 2/26/2020
Time 8:00am 8:00am 8:00am 8:00am 8:00am 8:00am 8:00am
Sample ID 2020004273 2020004274 2020004275 2020004277 2020004278 2020004279 2020004280
Type Constituent Site Units FGD Purge EQ Tank Eff PC Eff-Bio 1 Inf Bio 2 lnf Bio Sys Eff Service Water Filter Blank
Nitrite+Nitrate Colorimetric EPA353.2 mg-N/L 11 7.3 6.8 na 0.962 0.225 na
Mercury Cold vapor EPA 245.1 µg/L 23 15.6 na na na na na
Total Aluminum ICP EPA 200.7 mg/L 81.1 46.8 <0.1 <0.1 <0.1 0.846 na
Total Barium ICP EPA 200.7 mg/L 0.892 0.570 0.109 0.125 0.138 0.024 na
Total Boron ICP EPA 200.7 mg/L 53.4 33.9 26.7 26.9 5.11 0.356 na
Total Calcium ICP EPA 200.7 mg/L 3220 2230 1250 1160 1160 11.0 na
Total Iron ICP EPA 200.7 mg/L 104 54.9 <0.1 <0.1 <0.1 1.11 na
Total Magnesium ICP EPA 200.7 mg/L 429 416 379 372 370 5.07 na
Total Manganese ICP EPA 200.7 mg/L 4.10 2.46 0.373 0.331 0.114 0.034 na
Total Potassium ICP EPA 200.7 mg/L 28.9 163 214 203 257 2.32 na
Total Silica ICP EPA 200.7 14/1- 149000 116000 20600 21200 27100 14500 na
Total Silicon ICP EPA 200.7 mg/L 69.8 54.3 9.6 9.90 12.6 6.78 na
Total Sodium ICP EPA 200.7 mg/L 27.8 31.4 32.3 54.4 100 4.83 na
Total Strontium ICP EPA 200.7 mg/L 5.65 4.65 3.35 3.26 3.13 0.083 na
Dissolved? Selenium Filter House Digested EPA 200.8 µg/L 170 135 110 na 94.5 na na
Dissolved Selenium Dissolved µg/L na na na na na na na
Total Arsenic EPA 200.8 µg/L 203 128 <2 <2 2.24 <1 na
Total Cadmium EPA 200.8 µg/L <10 <10 <2 <2 <2 <1 na
Total Chromium EPA 200.8 µg/L 346 191 <2 <2 <2 <1 na
Total Copper EPA 200.8 µg/L 210 119 <2 <2 <2 2.08 na
Total Nickel EPA 200.8 µg/L 213 120 <2 <2 <2 <1 na
Total Selenium EPA 200.8 µg/L 339 271 108 97.5 92.6 <1 na
Total Zinc EPA 200.8 µg/L 272 166 ,-10 <10 <10 <5 na
Total Antimony na na na na na na na
Total Beryllium na na na na na na na
Total Silver na na na na na na na
Total Vanadium(V) na na na na na na na
Inorganic Ions Fluoride EPA 300.0 mg/L <10 <10 <10 na <10 <10 na
Inorganic Ions Chloride EPA 300.0 mg/L 2064 2028 2004 na 1941 11.00 na
Inorganic Ions Bromide EPA 300.0 mg/L 17.80 16.50 15.00 na 14.50 <10 na
Inorganic Ions Phosphate EPA 300.0 mg/L <10 <10 <10 na <10 <10 na
Inorganic Ions Sulfate EPA 300.0 mg/L 1400 1405 1398 na 1385 11.00 na
TDS SM2540C mg/L 293 na na na na na na
TSS 5M2540D mg/L na na na na <5 na na
Total Alkalinity CaCO3 SM 2320B-2011 mg/L na 294 36.9 na na na na
Alkalinity,Carbonate SM 2320B-2011 mg/L na <5 <5 na na na na
Alkalinity,Bicarbonate SM 2320B-2011 mg/L na 294 36.9 na na na na
Total Hardness mg/L CaCO3 na 7290 na na na na na
Chemical Oxygen Demand SM 5220D mg/L na 175 270 na 446 na na
Dissolved MeSe(IV) µg/L <=7.0 HU <=1.75HU <=1.75HU <=1.75 <=1.75 na
Dissolved Se(IV) µg/L 14.71 23.6H 16.2 H 2O.3 H 25.2 na
Dissolved Se(VI) µg/L 138 H 105H 84.6 83.9 H 75.4 na
Dissolved SeCN µg/L <=5.00 HU <=1.25 HU <=1.25 HU <=1.25 HU <=1.25 HU na
Dissolved SeMet µg/L <=7.00 HU <=1.75 HU <=1.75 HU <=1.75 HU <=1.75 HU na
Dissolved Unk Se Sp µg/L <=7.0 HU <=1.75 HU <=1.75 HU <=1.75 HU <=1.75 HU na
Dissolved Unk Sep Count count 0 0 0 0 0 na
Total Mercury ng/L na 9.72 <=0.13 <=0.13 2.29 na
1 Result between the MDL and MRL,result consider an estimate
H Holding time/or preservation time was not met
z Holding time/preservation not estaiblished for this method,BAL recommendations were not followed

Duke FGD WWTS Analytical Data Results
Report n /20020317 /20020317 /20020341 /20020341 /20020341 /20020341 /20020341 /20020341
Date 2/26/2020 2/26/2020 2/13/2020 2/13/2020 2/13/2020 2/13/2020 2/13/2020 2/13/2020
Time 8:00am 8:00am 8:00am 8:00am 8:00am 8:00am 8:00am 8:00am
Sample ID 2020004281 2020004283 202004394 2020004395 202004398 202004404 202004400 202004402
Type Constituent Site Units Trip Blk Filed Blank EQ Tank Eff PC Efll Bio 1 Infl Service Water Bioreader Influent Trip Blank Field Blank
Nitrite+Nitrate Colorimetric EPA353.2 mg-N/L na na na 10 0.192 na na na
Mercury Cold vapor EPA 245.1 µg/L na na 15.7 na na <0.05 na na
Total Aluminum ICP EPA 200.7 mg/L na na na <0.2 na na na na
Total Barium ICP EPA 200.7 mg/L na na _na <0.1 na na na na
Total Boron ICP EPA 200.7 mg/L na na 31.6 52.6 0.594 na na na
Total Calcium ICP EPA 200.7 mg/L na na 1940 1310 na na na na
Total Iron ICP EPA 200.7 mg/L na na na 19.8 na na na na
Total Magnesium ICP EPA 200.7 mg/L na na 413 426 na na na na
Total Manganese ICP EPA 200.7 mg/L na na na 1.31 na na na na
Total Potassium ICP EPA 200.7 mg/L na na na 169 na na na na
Total Silica ICP EPA 200.7 µg/L na na na 23500 na na na na
Total Silicon ICP EPA 200.7 mg/L na na na 11.0 na na na na
Total Sodium ICP EPA 200.7 mg/L na na na 35.7 na na na na
Total Strontium ICP EPA 200.7 mg/L na na na 3.20 na na na na
Dissolved? Selenium Filter House Digested EPA 200.8 µg/L na na na na na na na na
Dissolved Selenium Dissolved µg/L na na 164 115 na na na na
Total Arsenic EPA 200.8 µg/L na na 116 2.82 <1 na na na
Total Cadmium EPA 200.8 µg/L na na <10 <2 <1 na na na
Total Chromium EPA 200.8 µg/L na na 135 <2 <1 na na na
Total Copper EPA 200.8 µg/L na na 85.3 <2 1.68 na na na
Total Nickel EPA 200.8 µg/L na na 95.9 <2 <1 na na na
Total Selenium EPA 200.8 pg/L na na 284 116 <1 132 na na
Total Zinc EPA 200.8 µg/L na na 136 <10 <5 na na na
Total Antimony na na na na na 3.69 na na
Total Beryllium na na na na na <2 na na
Total Silver na na na na na <2 na na
Total Vanadium(V) na na na na na 3.81 na na
Inorganic Ions Fluoride EPA 300.0 mg/L na na na na na na na na
Inorganic Ions Chloride EPA 300.0 mg/L na na na na 21.0 na na na
Inorganic Ions Bromide EPA 300.0 mg/L na na na na 0.233 na na na
Inorganic Ions Phosphate EPA 300.0 mg/L na na na na na na na na
Inorganic Ions Sulfate EPA 300.0 mg/L na na na na na na na na
TDS SM2540C mg/L na na na na na na na na
TSS SM2540D mg/L na na na na na na na na
Total Alkalinity CaCO3 SM 2320B-2011 mg/L na na na na na na na na
Alkalinity,Carbonate SM 2320B-2011 mg/L na na na na na na na na
Alkalinity,Bicarbonate SM 2320B-2011 mg/L na na _na na na na na na
Total Hardness mg/L CaCO3 na na 6530 na na na na na
Chemical Oxygen Demand SM 5220D mg/L na na na 102 na na na na
Dissolved MeSe(IV) µg/L na na na <=1.75HU na na <=0.350HU na
Dissolved Se(IV) µg/L na na na 18.2H na na <=0.350HU na
Dissolved Se(VI) µg/L na na na 71.2H na na <=0.350HU na
Dissolved SeCN µg/L na na na <=1.25HU na na <=0.350HU na
Dissolved SeMet µg/L na na na <=1.75HU na na <=0.350HU na
Dissolved Unk Se Sp µg/L na na na <=1.75HU na na <=0.350HU na
Dissolved Unk Sep Count count na na na 0 na na 0 na
Total Mercury ng/L <=0.13U <=0.13U na 16.4 1.43 na <=0.13 <=0.13
1 Result between the MDL and MRL,result consider an estimate
H Holding time/or preservation time was not met
z Holding time/preservation not estaiblished for this method,BAL recommendations

Duke FGD WWTS Analytical Data Results
Report# /20020323 /20020323 /20020323 /20020323 /20020323 /20020323
Date 3/10/2020 3/10/2020 3/10/2020 3/10/2020 3/10/2020 3/10/2020
Time 8:00am 8:00am 8:00am 8:00am 8:00am 8:OOam
_SampleID 2020004301 2020004302 202004303 202004304 2020004305 202004306
Type Constituent Site Units FGD Purge EQ Tank Effi PC effl Bio 1 inf Bio 2 Inf Bio Sys Eff Servce Water
Nitrite+Nitrate Colorimetric EPA353.2 mg-N/L 23 23 21 na <0.01 0.27
Mercury Cold vapor EPA 245.1 pg/L 64.2 44.3 na na na na
Total Aluminum ICP EPA 200.7 mg/L 201 152 <1 <1 <1 0.702
Total Barium ICP EPA 200.7 mg/L 0.925 <0.5 <0.5 <0.5 0.022
Total Boron ICP EPA 200.7 mg/L 117 104 87.4 41.1 32.5 0.34
Total Calcium ICP EPA 200.7 mg/L 3760 4630 1610 1520 _1410 11.1
Total Iron ICP EPA 200.7 mg/L 286 214 <1 <1 <1 0.783
Total Magnesium ICP EPA 200.7 mg/L 922 863 696 613 523 5.11
Total Manganese ICP EPA 200.7 mg/L 10.6 8.25 1.09 1.78 1.68 0.014
Total Potassium ICP EPA 200.7 mg/L 61.7 76.9 67.2 106 121 2.29
Total Silica ICP EPA 200.7 pg/L 206000 193000 41.1 20000 25200 14900
Total Silicon ICP EPA 200.7 mg/L 96.2 90.1 5.13 9.35 11.8 6.94
Total Sodium ICP EPA 200.7 mg/L 52.5 45.9 41.1 38.9 41.1 4.70
Total Strontium ICP EPA 200.7 mg/L 8.62 8.41 5.13 4.7 4.17 0.079
Dissolved? Selenium Filter House Digested EPA 200.8 pg/L na na na na na na
Dissolved Selenium Dissolved pg/L 374 238 192 na 58.0 na
Total Arsenic EPA 200.8 pg/L 677 481 <2 <2 <2 <1
Total Cadmium EPA 200.8 pg/L <10 <10 <2 <2 <2 <1
Total Chromium EPA 200.8 pg/L 829 636 <2 <2 <2 <1 I
Total Copper EPA 200.8 pg/L S38 407 <2 <2 <2 1.98 1
Total Nickel EPA 200.8 pg/L 545 426 <2 <2 <2 <1
Total Selenium EPA 200.8 pg/L 818 695 205 112 61.3 <1
Total Zinc EPA 200.8 pg/L 1950 1210 <10 <10 <10 7.62
Total Antimony na na na na na na
Total Beryllium na na na na na na
Total Silver na na na na na na
Total Vanadium(V) na na na na na na
Inorganic Ions Fluoride EPA 300.0 mg/L <10 <10 12.20 na <10 <1
Inorganic Ions Chloride EPA 300.0 mg/L 3385 3271 3148 na 2412 13.10
Inorganic Ions Bromide EPA 300.0 mg/L 30.60 29.80 27.20 na 19.70 <1
Inorganic Ions Phosphate EPA 300.0 mg/L <0.1 <0.1 <0.1 na <0.1 <0.1
Inorganic Ions Sulfate EPA 300.0 mg/L 1422 1363 1451 na 1432 12.42
TDS SM2540C mg/L 11300 na na na na na
TSS SM2540D mg/L na na na na 5 na
Total Alkalinity CaCO3 SM 2320B-2011 mg/L na 738 19.2 na na na
Alkalinity,Carbonate SM 2320B-2011 mg/L na <5 <5 na na na
Alkalinity,Bicarbonate SM 2320B-2011 mg/L na 738 19.2 na na na
Total Hardness mg/L CaCO3 na 238 na na na na
Chemical Oxygen Demand SM 5220D mg/L na 1290 129 na 232 na
Dissolved MeSe(IV) pg/L <=7.00 HU <=1.75 HU <=1.75 HU <=1.75 HU <=1.75 HU na
Dissolved Se(IV) µg/L 43.2H 6.52 H 11.3H 104 <=1.75 HU na
Dissolved Se(VI) pg/L 66.1H 234H 459H <=1.50 HU <=1.50 HU na
Dissolved SeCN pg/L <=5.00HU <=1.25HU <=1.25HU <=1.25HU <=1.25HU na
Dissolved SeMet pg/L <=7.00HU <=1.75HU <=1.7SHU <=1.75HU <=1.75HU na
Dissolved Unk Se Sp µg/L <=7.00HU <=1.75HU <=1.75HU <=1.75HU <=1.75HU na
Dissolved Unk Sep Count count 0 0 0 0 0 na
Total Mercury ng/L <=0.13U - 5.891 <=3.32U <=0.66U na
1 Result between the MDL and MRL,result consider an estimate
H Holding time/or preservation time was not met
z Holding time/preservation not estaiblished for this method,BAL recommendations

Duke FGD WWTS Analytical Data Results
Report# /20020323 /20020323 /20020322 /20020322 /20020322 /20020322 /20020322
Date 3/10/2020 3/10/2020 3/24/2020 3/24/2020 3/24/2020 3/24/2020 3/24/2020
Time 8:00am 8:00am 7:30AM 7:30AM 7:30AM 7:30AM 7:30AM
Sample ID 2020004307 2020004308 202004290 2020004291 2020004292 2020004293 202004294
Type Constituent Site Units Filter Blank Trip Blank FGD Purge EQ Tank PC Eff Bio 1 Inf Bio 2 Inf Bio Sys Eff
Nitrite+Nitrate Colorimetric EPA353.2 mg-N/L na na 31 19.0 19 na 0.029
Mercury Cold vapor EPA 245.1 µg/L na na 45.1 27.2 na na na
Total Aluminum ICP EPA 200.7 mg/L na na 137 90.1 <0.1 0.283 0.574
Total Barium ICP EPA 200.7 mg/L na na 0.914 1.05 0.115 0.151 0.185 1
Total Boron ICP EPA 200.7 mg/L na na 83.4 63.5 64.2 77.9 92.8
Total Calcium ICP EPA 200.7 mg/L na na 3970 3010 260 1310 1320
Total Iron ICP EPA 200.7 mg/L na na 185 122 1260 1.10 2.53
Total Magnesium ICP EPA 200.7 mg/L na na 732 526 498 525 537
Total Manganese ICP EPA 200.7 mg/L na na 5.05 3.89 0.414 0.712 0.886
Total Potassium ICP EPA 200.7 mg/L na na 55.2 39.7 20.8 25.4 29.7
Total Silica ICP EPA 200.7 µg/L na na 155000 146000 17700 18800 18800
Total Silicon ICP EPA 200.7 mg/L na na 72.3 68.1 8.26 8.76 8.79
Total Sodium ICP EPA 200.7 mg/L na na 90.7 48.7 44.1 46.6 49.2
Total Strontium ICP EPA 200.7 mg/L na na 7.83 5.8 3.86 4.23 4.47
Dissolved? Selenium Filter House Digested EPA 200.8 µg/L na na na na na na na
Dissolved Selenium Dissolved µg/L <1 na 547 276 252 na <2
Total Arsenic EPA 200.8 µg/L na na 448 339 3.24 <2 <2
Total Cadmium EPA 200.8 µg/L na na <10 <10 <2 <2 <2
Total Chromium EPA 200.8 µg/L na na 538 420 <2 <2 <2
Total Copper EPA 200.8 µg/L na na 394 289 <2 2.02 <2
Total Nickel EPA 200.8 µg/L na na 395 281 <2 2.42 2.63
Total Selenium EPA 200.8 µg/L na _na 627 409 272 <2 <2
Total Zinc EPA 200.8 µg/L na na 1260 803 <10 <10 <10
Total Antimony na na na na na na na
Total Beryllium na na na na na na na
Total Silver na na na na na na na
Total Vanadium(V) na na na na na na na
Inorganic Ions Fluoride EPA 300.0 mg/L na na 29.70 12.00 11.90 na 11.50
Inorganic Ions Chloride EPA 300.0 mg/L na na 2461 1989 2227 na 2587
Inorganic Ions Bromide EPA 300.0 mg/L na na 20.60 17.00 18.50 na 24.20
Inorganic Ions Phosphate EPA 300.0 mg/L na na <10 <10 <10 na <10
Inorganic Ions Sulfate EPA 300.0 mg/L na na 1771 1715 1733 na 1698.00
TDS SM2540C mg/L na na 11400 na na na na
TSS SM2540D mg/L na na na na na na <5
Total Alkalinity CaCO3 SM 2320B-2011 mg/L na na na 95.0 22.7 na na
Alkalinity,Carbonate SM 2320B-2011 mg/L na na na <5 <5 na na
Alkalinity,Bicarbonate SM 2320B-2011 mg/L na na na 95.0 22.7 na na
Total Hardness mg/LCaCO3 na na na 9690 na na na
Chemical Oxygen Demand SM 5220D mg/L na na na 528 115 na 178
Dissolved MeSe(IV) µg/L na <=0.350 HU <=7.00 ZU <=1.75 ZU <=1.75 ZU <=1.75 ZU <=1.75 ZU
Dissolved Se(IV) µg/L na <=0.350 HU 8.83 ZJ 7.31Z 5.04ZJ 2.34 ZU <=1.75 ZU
Dissolved Se(VI) µg/L na <=0.350 HU 616 Z 293Z 271 <=1.50 ZU <=1.50 ZU
Dissolved SeCN µg/L na <=0.350 HU <=5.00 UZ <=1.25ZU <=1.25ZU <=1.25ZU <=1.25ZU
Dissolved SeMet µg/L na <=0.350 HU <=7.00 UZ <=1.75ZU <=1.75ZU <=1.75ZU <=1.75 ZU
Dissolved Unk Se Sp µg/L na <=0.350 HU <=7.00 UZ <=1.75ZU <=1.75ZU <=1.75ZU <=1.75 ZU
Dissolved Unk Sep Count count na 0 0 0 0 0 0
-Total Mercury ng/L <=0.13U <=0.13U na na 12.2 1.66 0.94
1 Result between the MDL and MRL,result consider an estimate
H Holding time/or preservation time was not met
z Holding time/preservation not estaiblished for this method,BAL recommendations

Duke FGD WWTS Analytical Data Results
Report# /20020322 /20020322 /20020322 /20020322
Date 3/24/2020 3/24/2020 3/24/2020 3/24/2020
Time 7:30AM 7:30AM 7:30AM 7:30AM
Sample ID 2020004295 2020004296 2020004297 2020004298
Type Constituent Site Units Service Water Filter Blank Trip Blank hg Trip Blank
Nitrite+Nitrate Colorimetric EPA353.2 mg-N/L 0.216 na na na
Mercury Cold vapor EPA 245.1 µg/L na na na na
Total Aluminum ICP EPA 200.7 mg/L _0.533 na na na
Total Barium ICP EPA 200.7 mg/L 0.023 na na na
Total Boron ICP EPA 200.7 mg/L 0.332 na na na
Total Calcium ICP EPA 200.7 _mg/L 11.1 na na na
Total Iron ICP EPA 200.7 mg/L 0.799 na na na
Total Magnesium ICP EPA 200.7 mg/L 4.96 na na na
Total Manganese ICP EPA 200.7 mg/L 0.015 na na na
Total Potassium ICP EPA 200.7 mg/L 2.22 na na na
Total Silica ICP EPA 200.7 pg/L 13000 na na na
Total Silicon ICP EPA 200.7 mg/L 6.10 na na na
Total Sodium ICP EPA 200.7 mg/L 4.68 na na na
Total Strontium ICP EPA 200.7 mg/L 0.084 na na na
Dissolved? Selenium Filter House Digested EPA 200.8 µg/L na na na na
Dissolved Selenium Dissolved µg/L na <1 na na
Total Arsenic EPA 200.8 µg/L <1 na na na
Total Cadmium EPA 200.8 µg/L <1 na na na
Total Chromium EPA 200.8 µg/L <1 na na na
Total Copper EPA 200.8 µg/L 2.48 na na na
Total Nickel EPA 200.8 µg/L <1 na na na
Total Selenium EPA 200.8 µg/L <1 na na na
Total Zinc EPA 200.8 µg/L <5 na na na
Total Antimony na na na na
Total Beryllium na na na na
Total Silver na na na na
Total Vanadium(V) na na na na
Inorganic Ions Fluoride EPA 300.0 mg/L <0.1 na na na
Inorganic Ions Chloride EPA 300.0 mg/L 13.30 na na na
Inorganic Ions Bromide EPA 300.0 mg/L 0.12 na na na
Inorganic Ions Phosphate EPA 300.0 mg/L <0.1 na na na
Inorganic Ions Sulfate EPA 300.0 mg/L 16.93 na na na
TDS SM2540C mg/L na na na na
TSS SM2540D mg/L na na na na
Total Alkalinity CaCO3 SM 2320B-2011 mg/L na na na na
Alkalinity,Carbonate SM 2320B-2011 mg/L na na na na
Alkalinity,Bicarbonate SM 2320B-2011 mg/L na na na na
Total Hardness mg/L CaCO3 na na na na
Chemical Oxygen Demand SM 5220D mg/L na na na na
Dissolved McSe(IV) µg/L na na <=0.350ZU na
Dissolved Se(IV) µg/L na na <=0.350ZU na
Dissolved Se(VI) µg/L na na <=0.350ZU na
Dissolved SeCN µg/L na na <=0.350ZU na
Dissolved SeMet µg/L na na <=0.350ZU na
Dissolved Unk Se Sp µg/L na na <=0.350ZU na
Dissolved Unk Sep Count count na na 0 na
Total Mercury ng/L 1.94 na na <=0.13U
1 Result between the MDL and MRL,result consider an estimate
H Holding time/or preservation time was not met
z Holding time/preservation not estaiblished for this method,BAL recommendations

Duke FGD WWTS Analytical Data Results
Organized Data
Remove<sign
1 qualifier
U qualifier
H&Zonly
Report k /20020317 /20020323 /20020322 FGD PURGE /20020341 /20020317 /20020323 /20020322 EQ TANK EFF
Date 2/26/2020 3/10/2020 3/24/2020 2/13/2020 2/26/2020 3/10/2020 3/24/2020
AVERAGE MAX AVERAGE MAX
Time 8:00am 8:00am 7:30AM 8:00am 8:00am 8:00am 7:30AM
Sample ID 2020004273 2020004301 202004290 202004394 2020004274 2020004302 2020004291
Type Constituent Site Units FGD Purge FGD Purge FGD Purge EQTank Eff EQ Tank Eff EQ Tank Effl EQTank
Nitrite+Nitrate Colorimetric EPA353.2 mg-N/L 11.0 23.0 31.0 21.7 31.0 na 7.3 23.0 19.0 16.4 23.0
Mercury 245.1(influent)&1613(effluent) pg/L 23 64.2 45.1 44.1 64.2 15.7 15.6 44.3 27.2 25.7 44.3
Total Arsenic EPA200.8 pg/L 203 677 448 442.7 677 116 128 481 339 266 481
Total Aluminum ICP EPA 200.7 mg/L 81.0 201 137 140 201 na 46.8 152 90.1 96.3 152.0
Total Barium ICP EPA 200.7 mg/L 0.892 0.925 0.914 0.9 0.925 na 0.570 1.05 0.8 1.1
Total Boron ICP EPA 200.7 mg/L 53.4 117 83.4 84.6 117 31.6 33.9 104 63.5 58.3 104.0
Total Calcium ICP EPA 200.7 mg/L 3220 3760 3970 3650 3970 1940 2230 4630 3010 2953 4630
Total Iron ICP EPA 200.7 mg/L 104 286 185 192 286 na 54.9 214 122 130.3 214.0
Total Magnesium ICP EPA 200.7 mg/L 429 922 732 694 922 413 416 863 526 554.5 863.0
Total Manganese ICP EPA 200.7 mg/L 4.10 10.6 5.05 6.6 10.6 2.46 8.25 3.89 4.9 8.3
Total Potassium ICP EPA 200.7 mg/L 28.9 61.7 55.2 48.6 61.7 na 163 76.9 39.7 93.2 163.0
Total Silica ICP EPA 200.7 pg/L 149000 206000 155000 170000 206000 na 116000 193000 146000 151667 193000
Total Silicon ICP EPA 200.7 mg/L 69.8 96.2 72.3 79.4 96.2 na 54.3 90.1 68.1 70.8 90.1
Total Sodium ICP EPA 200.7 mg/L 27.8 52.5 90.7 57.0 90.7 na 31.4 45.9 48.7 42.0 48.7
Total Strontium ICP EPA 200.7 mg/L 5.65 8.62 7.83 7.4 8.62 na 4.65 8.41 5.8 6.3 8.4
Total Cadmium EPA 200.8 pg/L 10 10 10 10.0 10 10 10 10 10 10.0 10.0
Total Chromium EPA 200.8 pg/l 346 829 538 571 829 135 191 636 420 346 636
Total Copper EPA200.8 pg/L 210 538 394 381 538 85.3 119 407 289 225 407
Total Nickel EPA200.B pg/L 213 545 395 384 545 95.9 120 426 281 231 426
Total Zinc EPA 200.8 pg/L 272 1950 1260 1161 1950 136 166 1210 803 579 1210
Total Antimony EPA 200.8 pg/L na na na na na na na na na na
na
Total Beryllium EPA 200.8 pg/L na na na na na na na na na na na
Total Silver EPA 200.8 nil na na na na na na na na na na
na
Total Vanadium(V) EPA 200.8 pg/L na na na na na na na na na na na
Inorganic Ions Fluoride EPA 300.0 mg/L 10 10 29.70 16.6 29.7 na 10 10 12.00 10.7 12.0
Inorganic Ions Chloride EPA 300.0 mg/L 2064 3385 2461 2637 3385 na 2028 3271 1989 2429 3271
Inorganic Ions Bromide EPA 300.0 mg/L 17.80 30.60 20.60 23.0 30.6 na 16.50 29.80 17.00 21.1 29.8
Inorganic Ions Phosphate EPA 300.0 mg/L 10.00 0.1 10 6.7 10 na 10 0.1 10 6.7 10.0
Inorganic Ions Sulfate EPA 300.0 mg/L 1400 1422 1771 1531 1771 na 1405 1363 1715 1494.3 1715.0
TDS SM2540C mg/L 293 11300 11400 7664 11400 na na na na na na
TSS SM2540D mg/L na na na na na na na na na na na
Total Alkalinity CaCO3 SM 2320B-2011 mg/L na na na na na 294 738 95.0 376 738
Alkalinity,Carbonate SM 2320B-2011 mg/L na na na na na na 5.0 5.0 5.0 5.0 5.0
Alkalinity,Bicarbonate SM 2320B-2011 mg/L na na na na na 294 738 95.0 376 738
Total Hardness mg/L CaCO3 na na na na na 6530 7294 238 9690 5938 9690
Chemical Oxygen Demand SM 5220D mg/L na na na na na na 175 1290 528 664 1290
Total Selenium EPA 200.8 pg/L 339 818 627 595 818 284 271 695 409 415 695
Total Selenium Filter House Digested EPA 200.8 pg/L 170 170 170 na 135 135 135
Dissolved Selenium Dissolved pg/L 374 547 461 547 164 238 276 226 276
Dissolved McSe(IV) pg/L 7.0 7.0 7.0 7.00 7 na 1.75 1.75 1.75 1.8 1.8
Dissolved Se(IV) pg/L 14.7 43.2 8.83 22.2 43.2 na 23.6 6.53 7.31 12.5 23.6
Dissolved Se(VI) pg/L 138 66.1 616 273.4 616 105 234 293 211 293
Dissolved SeCN pg/L 5.00 5.00 5.00 5.00 5 1.25 1.25 1.25 1.3 1.3
' Dissolved SeMet pg/L 7.00 7.00 7.00 7.00 7 na 1.75 1.75 1.75 1.8 1.8
Dissolved Unk Se Sp pg/L 7.00 7.00 7.00 7.00 7 na 1.75 1.75 1.75 1.8 1.8
Dissolved Unk Sep Count count 0 0 0 0.00 0 na 0 0 0 0.0 0.0
1 Result between the MDL and MRL,result consider an estimate
H Holding time/or preservation time was not met
z Holding time/preservation not estaiblished for this method,BAL recommendations were not followed
U Results is<-MDL,result reported as MDL or CRRL

Duke FGD WWTS Analytical Data Results
Organized Data
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u qualifier
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Report* /20020341 /20020317 /20020323 /20020322 Phys-Chem Effluent/Biol influent /20020317 /20020322 /20020323 Rio 1 Effluent/Bio 2 Influent
Date 2/13/2020 2/26/2020 3/10/2020 3/24/2020 2/26/2020 3/24/2020 3/10/2020
AVERAGE MAX AVERAGE MAX
Time 8:00am 8:00am 8:00am 7:30AM 8:00am 7:30AM 8:00am
Sample ID 2020004395 2020004275 202004303 2020004292 2020004277 2020004293 202004304
Type Constituent Site Units PC Efll Bio 1 Infl PC Eff-Bio 1 Int PC effl Bio lint PC Eff Bio 1 Int Rio 21nt Bio 2 Int Bio 2 Int
Nitrite+Nitrate Colorimetric EPA353.2 mg-NA 10.0 6.8 21.0 19.0 14.2 21.0 na na na na na
Mercury 245.1(influent)&1613(effluent) pg/L 16.4 9.72 5.89 12.2 11.1 16.4 0.13 1.66 3.32 1.70 3.32
Total Arsenic EPA 200.8 PTA 2.82 2 2 3.24 2.515 3.24 2 2 2 2.00 2
Total Aluminum ICP EPA 200.7 mg/L 0.2 0.1 1 0.1 0.35 1.00 0.1 0.283 1 0.46 1
Total Barium ICP EPA 200.7 mg/L 0.1 0.109 0.5 0.115 0.206 0.5 0.125 0.151 0.5 0.26 0.5
Total Boron ICP EPA 200.7 mg/L 52.6 26.7 87.4 64.2 58 87.4 26.9 77.9 41.1 48.63 77.9
Total Calcium ICP EPA 200.7 mg/1 1310 1250 1610 260 1108 1610 1160 1310 1520 1330 1520
Total Iron ICP EPA 200.7 mg/L 19.8 0.1 1 1260 320 1260 0.1 1.10 1 0.73 1.1
Total Magnesium ICP EPA 200.7 mg/L 426 379 696 498 500 696 372 525 613 503 613
Total Manganese ICP EPA 200.7 mg/L 1.31 0.373 1.09 0.414 0.80 1.31 0.331 0.712 1.78 0.94 1.78
Total Potassium ICP EPA 200.7 mg/L 169 214 67.2 20.8 118 214 203 25.4 106 111 203
Total Silica ICP EPA 200.7 pg/l 23500 20600 41.1 17700 15460 23500 21200 18800 20000 20000 21200
Total Silicon ICP EPA 200.7 mg/L 11.0 9.6 5.13 8.26 8.5 11 9.9 8.76 9.35 9.34 9.9
Total Sodium ICP EPA 200.7 mg/L 35.7 32.3 41.1 44.1 38 44.1 54.4 46.6 38.9 46.6 54.4 1
Total Strontium ICP EPA 200.7 mg/L 3.20 3.35 5.13 3.86 3.89 5.13 3.26 4.23 4.7 4.06 4.7
Total Cadmium EPA200.8 pg/L 2 2 2 2 2 2 2 2 2 2.00 2
Total Chromium EPA200.8 pg/L 2 2 2 2 2 2 2 2 2 2.00 2
Total Copper EPA200.8 pail 2 2 2 2 2 2 2 2.02 2 2.01 2.02
Total Nickel EPA 200.8 pg/L 2 2 2 2 2 2 2 2.42 2 2.14 2.42
Total Zinc EPA 200.8 mil 10 10 10 10 10 10 10 10 10 10 10
Total Antimony EPA 200.8 pg/L na na na na na na na na na na na
Total Beryllium EPA 200.8 pg/L na na na na na na na na na na na
Total Silver EPA200.8 pg/L na na na na na na Ile na na
Total Vanadium(V) EPA 200.8 pg/L na n na na na na na na na na na
Inorganic Ions Fluoride EPA 300.0 mg/L na 10 12.20 11.90 11.4 12.2 na na na na na
Inorganic Ions Chloride EPA300.0 mg/L na 2004 3148 2227 2460 3148 na na na na na
Inorganic Ions Bromide EPA 300.0 mg/L na 15.00 27.20 18.50 20.2 27.2 na na na na na
Inorganic Ions Phosphate EPA 300.0 mg/L na 10 0.1 10 6.7 10 na na na na na
Inorganic Ions Sulfate EPA 300.0 mg/L na 1398 1451 1733 1527 1733 na na na na na
TDS 5M2540C mg/L na na na na na na na na na na
TSS SM2540D mg/L na na na na na na na na na na na
Total Alkalinity CaCO3 5M 2320B-2011 mg/L na 36.9 19.2 22.7 26.3 36.9 na na na na na
Alkalinity,Carbonate SM 2320B-2011 mg/L na 5 5 5 5 5 na na na na na
Alkalinity,Bicarbonate SM 2320B-2011 mg/L na 36.9 19.2 22.7 26.3 36.9 na na na na na
Total Hardness mg/L CaC(13 na na na na na na na na na na na
Chemical Oxygen Demand SM 5220D mg/L 102 270 129 115 154 270 n n na na na
Total Selenium EPA 200.8 pg/L 116 272 205 272 216 272 2 2 112 38.7 112
Total Selenium Filter House Digested EPA 200.8 pg/L 110 na na 110 110 na na na na na
Dissolved Selenium Dissolved pg/L 115 na 192 252 186 252 na na na na na
Dissolved MCSeIlV) pg/L 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75
Dissolved Se(N) pg/l 18.2 16.2 11.3 5.04 12.7 18.2 20.3 2.34 104 42 104
Dissolved Se(VI) pg/L 71.2 84.6 459 271 221 459 83.9 1.50 1.5 29 83.9
Dissolved SeCN pg/L 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25
Dissolved SeMet pg/L 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75
Dissolved Unk Se Sp pg/L 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75 1.75
Dissolved Unk Sep Count count 0 0 0 0 0 0 0 0 0 0 0
1 Result between the MDL and MRL,result consider an estimate
H Holding time/or preservation time was not met
z Holding time/preservation not estaiblished for this method,BAL recommendatir
U Results is<-MDL,result reported as MDL or CRRL

Duke FGD WWTS Analytical Data Results
Organized Data
Remove<sign
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Report a /20020317 /20020323 /20020322 Final Effluent from Bio System
Date 2/26/2020 3/10/2020 3/24/2020
AVERAGE MAX
Time 8:00am 8:00am 7:30AM
Sample ID 2020004278 2020004305 202004294
Type Constituent Site Units Bio Sys Eff Bio Sys Eff Blo Sys Eff
NitriterNitrate Colorimetric EPA353.2 mg-N/L 0.962 0.01 0.029 0.33 0.962
Mercury 245.1(influent)&1613(effluent) pg/L 0.13 0.66 0.94 0.58 0.94
Total Arsenic EPA 200.8 pg/L 2.24 2 2 2 08 2.24
Total Aluminum ICP EPA 200.7 mg/L 0.1 1 0.574 0.56 1.0
Total Barium ICP EPA 200.7 mg/L 0.138 0.5 0.185 0.27 0.50
Total Boron ICP EPA 200.7 mg/L 5.11 32.5 92.8 43.5 92.8
Total Calcium ICP EPA 200.7 mg/L 1160 1410 1320 1297 1410
Total Iron ICP EPA 200.7 mg/L 0.1 1 2.53 1.21 2.53
Total Magnesium ICP EPA 200.7 mg/L 370 523 537 477 537
Total Manganese ICP EPA 200.7 mg/L 0.114 1.68 0.886 0.893 1.68
Total Potassium ICP EPA 200.7 mg/L 257 121 29.7 136 257
Total Silica ICP EPA 200.7 µg/L 27100 25200 18800 23700 27100
Total Silicon ICP EPA 200.7 mg/L 12.6 11.8 8.79 11.1 12.6
Total Sodium ICP EPA 200.7 mg/L 100 41.1 49.2 63.433 100
Total Strontium ICP EPA 200.7 mg/L 3.13 4.17 4.47 3.923 4.47
Total Cadmium EPA 200.8 pg/L 2 2 2 2.000 2
Total Chromium EPA 200.8 pg/L 2 2 2 2.000 2
Total Copper EPA 200.8 pg/L 2 2 2 2.000 2
Total Nickel EPA200.8 µg/L 2 2 2.63 2.210 2.63
Total Zinc EPA 200.8 µg/L 10 10 10 10.000 10
Total Antimony EPA200.8 µg/L na na na na na
Total Beryllium EPA200.8 pg/L na na na na na
Total Silver EPA200.8 pg/L na na na na
Total Vanadium(V) EPA 200.8 pg/L na na na na na
Inorganic Ions Fluoride EPA 300.0 mg/L 10 10 11.50 10.50 11.5
Inorganic Ions Chloride EPA 300.0 mg/L 1941 2412 2587 2313 2587
Inorganic Ions Bromide EPA300.0 mg/L 14.5 19.7 24.2 19 24.2
Inorganic Ions Phosphate EPA 300.0 mg/L 10 0.1 10 6.7 10
Inorganic Ions Sulfate EPA 300.0 mg/L 1385 1432 1698.00 1505 1698
TDS SM2540C mg/L n n na na
a na
TSS 5M2540D mg/L 5 5 5 5.000 5
Total Alkalinity CaCO3 SM 23208-2011 mg/L na na na na na
Alkalinity,Carbonate SM 23208-2011 mg/L na na na na na
Alkalinity,Bicarbonate 5M 2320B-2011 mg/L na na na na na
Total Hardness mg/L CaCO3 na na na na na
Chemical Oxygen Demand SM 5220D mg/L 446 232 178 285.3 446
Total Selenium EPA 200.8 pg/L 92.6 61.3 2 52.0 92.6
Total Selenium Filter House Digested EPA 200.8 pg/L 94.5 94.5 94.5
Dissolved Selenium Dissolved pg/L 58.0 58.0 58
Dissolved MeSe(IV) pg/L 1.75 1.75 1.75 1.8 1.75
Dissolved Se(IV) pg/L 25.2 1.75 1.75 9.6 25.2
Dissolved Se(VI) pg/L 75.4 1.50 1.50 26.1 75.4
Dissolved SeCN pg/L 1.25 1.25 1.25 1.3 1.25
Dissolved SeMet µg/L 1.75 1.75 1.75 1.8 1.75
Dissolved Unk Se Sp pg/L 1.75 1.75 1.75 1.8 1.75
Dissolved Unk Sep Count count 0 0 0 0.0 0
1 Result between the MDL and MRL,result consider an estimate
H Holding time/or preservation time was not met
z Holding time/preservation not estaiblished for this method,BAL recommendatir
U Results is<-MDL,result reported as MDL or CRRL

ROXBORO LEACHATE TREATMENT ASSESSMENT REPORT
Appendix B FGD Wastewater Treatment System Process Units Details
Appendix B FGD WASTEWATER TREATMENT SYSTEM PROCESS
UNITS DETAILS
B.2

FGD Wastewater Treatment System Process Units Details
Clarifier A&B Sand Filter A,B,C,D BioReactor 1-Tank A-X BioReactor 2-Tank A-P
Number of Units 2 4 22 14
Max-Min Flow(gpm) - 49.8-19.0 96.3-30.8
Total Capacity(gal) 892,000 6,100 31,000 31,000
Working Capacity(gal) - 9.8 22000-29000(max 26ft) 22000-29000
Diameter(ft) 70 21 13 13
Side Wall(ft) 31 - 31 31
Center Well(ft)-Diameter 16 - - -
Surface Area(ft2) 3,647 75.4 66.4 66
Filtration Rate(gpm/ft2) - 1.8-4.9 0.75 1.45
Information in bold from FGW WWTS P&IDs