NC0024406_SOC WQ S18-004_20200423 (2)

gfrDUKE RECEIVED James Wells Vice President
'�C ENERGY. MAY 01 2020 Environmental,Health and Safety
Programs&Environmental Sciences
526 South Church Street
Charlotte,NC 28202
NCDEQIDWRINPDES [phone]
April 23, 2020
Via Overnight Mail
Lon Snider
Winston Salem Regional Office Environmental Regional Supervisor
North Carolina Department of Environmental Quality
Division of Water Resources
450 West Hanes Mill Road, Suite 300
Winston-Salem, NC 27105
Bob Sledge
North Carolina Department of Environmental Quality
Water Quality Permitting Program
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Report Under Special Order by Consent—EMC SOC WQ S 18-004
Duke Energy Carolina, LLC — Belews Creek Steam Station
NPDES Permit NC0024406
2019 Annual Seep Survey Report
Dear Messrs. Snider and Sledge:
On behalf of Duke Energy Carolinas,LLC(DEC), I am submitting to you the Belews Creek Steam
Station Annual Seep Report summarizing the findings of the comprehensive survey as required by
the Belews Creek Steam Station Special Order by Consent (SOC), SOC No. S18-004 Section
2.c.3).
As required by the SOC,I certify under penalty of law that this document and all attachments were
prepared under my direction or supervision in accordance with a system designed to assure that
qualified personnel properly gather and evaluate the information submitted. Based on my inquiry
of the person or persons who manage the system, or those persons directly responsible for
gathering the information, the information submitted is, to the best of my knowledge and belief,
true, accurate, and complete. I am aware that there are significant penalties for submitting false
information, including the possibility of fine and imprisonment for knowing violations.

Messrs. Snider and Sledge
April 23, 2020
Page 2
Please direct any questions concerning the Belews Creek Steam Station SOC No. S 18-004 to
Joyce Dishmon at [phone] and to Chris Hallman at(980) 373-7892 relative to the annual
seep inspection report.
Sincerely,
James e s
Vice President, Environment, Health & Safety-
Programs and Environmental Sciences
Duke Energy
Attachment:
Belews Creek Steam Station 2019 Annual Seep Survey
CC: Richard Baker, Duke Energy
Joyce Dishmon, Duke Energy
Chris Hallman, Duke Energy
Brenda Johnson, Duke Energy
Paul Draovitch, Duke Energy
Matt Hanchey, Duke Energy

synTerra
2019 ANNUAL SEEP REPORT
BELEWS CREEK STEAM STATION
EMC SOC WQ S18-004
3195 PINE HALL ROAD
BELEWS CREEK, NC 28146
APRIL 2020
PREPARED FOR
f DUKE
ENERGY*
CAROLINAS
DUKE ENERGY CAROLINAS, LLC
•
CraiigIdy, NC L 1599
Senior Project Manager
t- - avid Avard
Project Scientist

• 2019 Annual Seep Report April 2020
Belews Creek Steam Station-Duke Energy Carolinas, LLC SynTerra
TABLE OF CONTENTS
SECTION PAGE
1.0 INTRODUCTION 1-1
1.1 Inspection Details 1-1
2.0 FINDINGS 2-1
2.1 General Observations 2-1
2.2 Effect of Decanting 2-1
2.3 Changes to Seep Status 2-1
3.0 REFERENCES 3-1
LIST OF FIGURES
Figure 1 SOC Locations and Inspection Area
LIST OF TABLES
Table 1 SOC Locations and Descriptions— March 2019
LIST OF APPENDICES
Appendix A Photographs
Page i

. 2019 Annual Seep Report April 2020
Belews Creek Steam Station-Duke Energy Carolinas,LLC SynTerra
LIST OF ACRONYMS
EMC Environmental Management Commission
SOC Special Order by Consent
Page ii

, 2019 Annual Seep Report April 2020
Belews Creek Steam Station-Duke Energy Carolinas, LLC SynTerra
1.0 INTRODUCTION
On March 29, 2019, SynTerra (Craig Eady, NC L.G. #1599) inspected the Belews Creek
Steam Station (Belews Creek or the Site) property for existing and potential new seeps.
No changes to seep status were observed during this inspection. Inspection activities
were performed in accordance with North Carolina Environmental Management
Commission (EMC) Special Order by Consent WQ #S18-004. That Special Order By
consent (SOC) describes inspection requirements as follows:
Duke Energy shall conduct annual comprehensive surveys of areas down gradient of ash
basins identifying new seeps, and documenting the physical characteristics of previously
documented seeps.All examinations of seeps must include identification of seeps by
approximate latitude and longitude and date-stamped digital photographs of their
appearance. A report summarizing the findings of the surveys, including a section
analyzing the effect decanting of the basin(s) has on seep flows, accompanied by copies of
the photographs noted above ("Annual Seep Report"), shall be submitted to DWR in
conjunction with submittal of the April 30 quarterly report noted in 2(c)(2) above. This
Annual Seep Report must list any seep that has been dispositioned (as described below)
during the previous year, including an analysis of the manner of disposition.
All locations listed in Table 1 of the SOC were observed and documented with
photographs during the inspection.
General observations include:
• No previously unidentified seeps were observed during the inspection.
• No notable changes to seep status were observed during this inspection.
• Decanting was initiated on March 27, 2019, two days before the inspection.
1.1 Inspection Details
The weather was clear before and during the inspection. Temperatures ranged from
approximately 47 to 72 degrees Fahrenheit (F). On the day of the inspection, no
measureable precipitation occurred (less than 0.1 inches of precipitation was recorded
by the Site rain gauge), and no precipitation was recorded the four days before the
inspection.
The inspector reviewed previous seep inspection reports and the weekly dam safety
inspection reports for the ash basin.Jeff Gateley (Duke Energy system owner)
conducted the ash basin dam safety inspections and prepared the reports. Mr. Gateley
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2019 Annual Seep Report April 2020
Belews Creek Steam Station-Duke Energy Carolinas,LLC SynTerra
was interviewed about recent rainfall, construction/stabilization projects associated
with the ash basin, and general Site conditions in and around the ash basin.
Observations from the dam safety inspection reports were consistent with observations
made during the annual inspection.
The inspection included observations in the following areas (Figure 1):
• Along streams located between the ash basin and the Dan River
• Areas along and downgradient of the ash basin dam
• Along the portion of the banks of Belews Reservoir nearest to the ash basin
• Along streams located between Pine Hall Road and Belews Reservoir
Seep locations and inspection areas are shown on Figure 1. Observations noted during
the inspection are summarized on Table 1. Photographs taken of each seep location
during the inspection are included in Appendix A.
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2019 Annual Seep Report April 2020
Belews Creek Steam Station-Duke Energy Carolinas,LLC SynTerra
2.0 FINDINGS
2.1 General Observations
Inspection observations for each seep are shown in Table 1. Details include:
• No new seeps were observed during the inspection.
• No previously unidentified or unreported pipes were observed during
inspection.
• Flow conditions in the inspected seeps and streams were low to moderate
• Increase in green algae growth in most of the streams and seep channels in
relation to previous inspections
2.2 Effect of Decanting
Ash basin decanting was initiated on March 27, 2019. The annual seep inspection
occurred two days after decanting commenced (March 29, 2019). There were no
noticeable effects to seep flow related to decanting.
2.3 Changes to Seep Status
Mr. Eady inspected each seep to evaluate whether it met requirements to be
dispositioned in accordance with the SOC. The requirements for dispositioning a seep
are as follows:
For purposes of this Special Order, "dispositioned" includes the following: (1) the seep is
dry for at least three consecutive quarters; (2) the seep does not constitute, and does not
flow to, waters of the State or Waters of the United States for three consecutive quarters;
(3) the seep is no longer impacted by flow from any coal ash basin as determined by the
Director of DWR in accord with applicable law and best professional judgment; or (4) the
seep has been otherwise eliminated (e.g., through an engineering solution). If a seep that
has been dispositioned through drying up reappears in any subsequent survey, such a
seep will no longer be deemed dispositioned and can be subsequently re-dispositioned as
specified above. Non-constructed seeps described in paragraph 1(h) of this SOC cannot be
dispositioned through option (2) above.
No changes to seep status were observed during this inspection.
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2019 Annual Seep Report April 2020
Belews Creek Steam Station-Duke Energy Carolinas,LLC SynTerra
3.0 REFERENCES
North Carolina Department of Environmental Quality. (2018). Special Order by Consent
EMC SOC WQ S18-004.
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2019 Annual Seep Report April 2020
Belews Creek Steam Station-Duke Energy Carolinas,LLC SynTerra
FIGURES

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:; ASH BASIN WASTE BOUNDARY
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�W'�D �• —STRUCTURAL FILL BOUNDARY(CLOSED)
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: ifr% /` .. , . , LANDFILL COMPLIANCE BOUNDARY
' �' 1 ; , —- DUKE ENERGY CAROLINAS PROPERTY LINE
. < ' �< am.
4O v°: I , K SPECIAL ORDER BY CONSENT(SOC)INSPECTION AREA
PINE HALL •�': r `- COAL
ROAD LANDFILL �,.0"- PILE r STREAM(AMEC NRTR)
(CLOSED) �,
o° "A WETLAND AMEC NRTR
�/�•+ STRUCTURAL. y POWE'< ( )
. "• ', FILL . ' '../.- ♦ , PLANT a',.„ ,° .' ., .. .,. " NOTES:
��'^ (CLOSED) 'y' , '� 1.'MONITORED PER TERMS OF NPDES PERMIT
��- �'s '' ? / 2 SPECIAL ORDER BY CONSENT(SOC)LOCATIONS ARE DESCRIBED IN EMC SOC
•■ +- lS-8 _ �' >✓ .' WQ S18-004.
im
t _ :� 3 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM(NPDES)LOCATIONS
]ill ,t '- ARE DESCRIBED IN PERMIT NC0024406.
y5l'^„ I � y< , 4.NATURAL RESOURCES TECHNICAL REPORT(NRTR)WAS PREPARED BY AMEC
a
^��r^y -�y,� "*, FOSTER WHEELER INC..JULY 2,2015.
�''% •
"fit - • 5.PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
tic _ ., '> ,'
o ''''....•:.... ...,
�` -. �¢.�• 6 ALL BOUNDARIES ARE APPROXIMATE_
/
I -�`*•....:- --..•
•+ • ' 7 AERIAL PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON AUGUST 17,
�.-••
4 2017.IMAGE COLLECTED ON APRIL 8,2017.
8 DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE
PLANE COORDINATE SYSTEM FIPS 3200(NAD83)
DUKE 0 750 1.50c FIGURE 1
I i 'IC"ENERGY G-HICSCALEINFEET SOC LOCATIONS AND INSPECTION AREA
CARD 2019 ANNUAL SEEP REPORT
s DRAWN BV.C.DAMS DATE:03/18/2020
0 REVISED BY:C.DAVIS DATE:03/18/2020 BELEWS CREEK STEAM STATION
�.rOALTON MHP RD ‘ CHECKED BY:T.HARTMAN DATE:03/27/2020
P...a_-----•
APPROVEDBV:A.ALBERT ,��. DA7E:03/27/2020 BELEWS CREEK, NORTH CAROLINA
• '�'•I * PROJECT MANAGER:A.ALBERT
synTerra
www.s nterracor..com

. , 2019 Annual Seep Report April 2020
Belews Creek Steam Station-Duke Energy Carolinas,LLC SynTerra
TABLES

TABLE 1
SOC LOCATIONS AND DESCRIPTIONS- MARCH 2019
2019 ANNUAL SEEP REPORT
BELEWS CREEK STEAM STATION
DUKE ENERGY CAROLINAS, LLC, BELEWS CREEK, NC
Location Coordinates Receiving
Facility Sample ID Receiving Waterbody Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection
Latitude Longitude Classification
Flow via approximately 3 foot wide unnamed tributary to the
Belews S-01' 36.293229 -80.085208 UT to the Dan River WS-V Dan River,located northwest of the active ash basin,west of NA-Seep Dispositioned NA-Seep Dispositioned Steady dear Flaw.Clayey sandy substrate with no biofilm and
evidence of orange aerobic bacteria staining.
Middleton Loop.From sampling-No CCR impacts.
Steady low flow.Significant leaf litter.No orange aerobic
Seep to approximately 3.5 foot wide stream channel,located
Monitoring a[established Duke pH 5-10 S.U. bacteria/floc/iron-oxidation on silty substrate.Channel likely
Belews S-02 36.29689 -80.0844 UT to the Dan River WS-V northwest of the active ash basin.Stream flows north to the
Dan River. Energy S-02 monitoring site Hardness 200 mg/L washed out due to recent storms.Plywood weir backed up with
gravel/sand deposits.
Flow via approximately 3 foot wide unnamed tributary to the Flow is moderate.Water is clear.Some leaf litter.No orange
Belews 5-03. 36.298409 -80.0833 UT to the Dan River WS-V Dan River,located northwest of the active ash basin,west of NA-Seep Dispositioned NA-Seep Dispositioned aerobic bacteria/floc/iron-oxidation on silty sand substrate.
Middleton Loop.From sampling-No CCR Impacts.
Flow via approximately 3 foot wide unnamed tributary to the Significant leaf litter.Low to moderate flow.Water is clear.
Belews 5-04' 36.298015 -80.082127 UT to the Dan River WS-V Dan River,located northwest of the active ash basin,west of NA-Seep Dispositioned NA-Seep Dispositioned Sandy silt with some gravel on substrate.No
Middleton Loop.From sampling-No CCR impacts. bacteria/floc/orange staining or biofilm.
Flow via approximately 3.5 foot wide unnamed tributary to the Some leaf litter in channel.Steady to moderate flow of clear
Belews S-05* 36.300469 -80.080796 UT to the Dan River WS-V Dan River,located northwest of the active ash basin,west of NA-Seep Dispositioned NA-Seep Dispositioned water.Sandy silt substrate.No orange aerobic
Middleton Loop.From sampling-No CCR impacts. bacteria/floc/iron-oxidation apparent on substrate.
Seep to UT to Belews Reservoir(former ash basin outfall Monitoring at established Duke pH 5-10 S.U. Low flow with current undulations below surface.Signifiacant
Belews S-06 36.29615 -80.061 UT to Belews Reservoir WS-V Hardness 300 mg/L green algae growth.Muddy substrate.Some biofilm along the
channel). Energy 5-06 monitoring site. TDS 700 mg/L edge of the drainage way.
Low diffuse flow to a wetland area with initial flow to Charlie's Plywood weir toppled over.Low flow in broad channel around
Belews 5-07' 36.287172 -80.0642 Charlie's Pond C Pond and ultimate discharge to Belews Reservoir.From NA-See the end of the weir on east bank.Muddy substrate with leaf
g p Dispositioned NA-Seep Dispositioned litter.Maim and orange algae growth in stagnant areas along
sampling-No CCR impacts.
bank.Visible flow below water surface.
Seep to approximately 4 foot wide stream channel,located Monitoring at established Duke pH 5-10 S.U. No biofilm or orange aerobic bacteria/floc/Iron-oxidation on
Belews S-08 36.27986 -80.0776 UT to Belews Reservoir C south of the Pine Hall Road Ash Landfill.Stream flows south to Energy S-08 monitoring site Selenium 10 pg/L substrate.Some green algae growth observed.Minimal leaf
Belews Reservoir. litter.Clear low flow.Sandy gravel substrate.
Monitoring at point downstream S.U.
Seep to approximate 2.5 foot wide stream channel,located of confluence of 5-09 and 5-16, Selenium
S.U.
pg/L No biofilm or orange aerobic bacteria/floc/Iron-oxidation on
Belews S-09 36.280215 -80.072163 UT to Belews Reservoir C south of Pine Hall Road Ash Landfill and west of Structural Fill Sulfates 600 mg/L substrate.Green algae growth on rocky sandy substrate.
site.Stream flows south to Belews Reservoir. Prior to entering Belews Hardness 500 mg/L Significant leaf litter.Moderate clear flow with stagnant areas.
Reservoir. TDS 800 rng/L
Monitoring location about 500 feet below the toe of the dam for pH 5-10 S.U.
Cadmium 2 pg/L
the seep to approximately 6 foot wide stream channel,just Orange aerobic bacteria/floc/iron-oxidation on sandy substrate.
Monitoring at established Duke Chlorides 600 mg/L
Belews S-10 36.299232 -80.075795 UT to the Dan River WS-IV before the stream joins a larger UT.Combined stream flow has Energy 5-10 monitoring site. Mercury 0.1 pg/L Light to moderate flow.Flow rate increases downstream.Water
confluence with ash basin discharge Flow from concrete flume Hardness 600 mg/L is clear with moderate leaf litter.
structure.
TDS 1200 mg/L
Page 1 of

•
TABLE 1
SOC LOCATIONS AND DESCRIPTIONS-MARCH 2019
2019 ANNUAL SEEP REPORT
BELEWS CREEK STEAM STATION
DUKE ENERGY CAROLINAS,LLC, BELEWS CREEK,NC
Location Coordinates Receiving
Facility Sample ID Receiving Waterbody Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection
Latitude Longitude Classification
Constructed seep conveying toe drain discharge from dam via Strong steady flow over gravel and sandy substrate.Water is
S-11 36.29859 -80.07571 UT to Dan River WS-IV rip-rapped effluent channel to unnamed tributary to the Dan NA-Monitoring Established per See page 5 of SOC 518-004 clear.Some orange floc and biofilm on stagnant areas along
River. Terms of NPDES Permit Attchment A channel.Significant green algae growth along bank edges and
rocks within channel.
Seep to natural stream in small valley east of active ash basin. Low to moderate flow in channel.Clear water.Sandy substrate
S-12. 36.2968 -80.0605 UT to Belews Reser-volt WS-IV Stream flows south into UT to Belews Reservoir(former ash NA-Seep Dispositioned NA-Seep Dispositioned with mud overlay.Light green algae growth on substrate.No
basin outfall channel).From sampling-No CCR impacts. orange floc or biofilm present.
Minor seep to small stream channel east of active ash basin, Slight flow with under current and leaf litter.Significant orange
Belews S-13• 36.2925 -80.0617 UT to Belews Reservoir wS-IV located east of Pine Hall Road.Stream flows south to Belews NA-Seep Dispositioned NA-Seep Dispositioned algae growth on muddy substrate.Biofllm observed In stagnant
Reservoir.From sampling-No CCR impacts. areas of channel.
Minor seep to small stream channel east of active ash basin, Very slight flow with small ripples below water surface.Black
Belews S-14'• 36.29221 -80.0624 UT to Belews Reservoir WS-IV located east of Pine Hall Road.Stream flows south to Belews NA-Seep Dispositioned NA-Seep Dispositioned organic leaf material is apparent.Moderate green algae growth
Reservoir.No flow observed during most recent sampling
events. at confluence of 5-13 present on muddy substrate.
Seep to small stream located east of 5-10 and 5-11 locations. Low flow and clear water.Some brown algae growth on
Helr,v. S-15' 36.29927 -80.0754 UT to Dan River WS-IV Stream Flow drains north,joining other stream flows.Combined NA-Seep Dispositioned NA-Seep Dispositioned substrate in pooled areas.Leaf litter present on muddy sandy
Flow has confluence with ash basin discharge flow from
concrete flume structure.From sampling-No CCR impacts. substrate.No biofilm or orange floc observed.
Seep to small stream channel,located south of Pine Hall Road, Siltysandy substrate.Low clear flow.Leaf liter and iron oxide
•
Belews S 16 36.27961 -80.0726 UT to Belews Reservoir C and west of Structural Fill site.Stream flows south to Belews NA SeepDispositioned NA- Dispositioned
Po Seep P
Reservoir.From sampling-No CCR impacts. staining/orange floc where flow appears in Channel.
Small seep located downgradlent from the toe of the dam,just Moderate flow over clayey sand substrate with algae growth,
NA-Flows to effluent west of the rip-rapped effluent channel.Flows from wetland NA-Monitored per terms of the NA-Not a classified surface
Belews 5-18 36.29833 -80.07572 channel for NPDES outfall NA area to effluent channel.This non-constructed seep flows to a NPDES permit water. biofilm,and orange aerobic bacteria/floc/Iron-oxidation.
portion of an NPDES wastewater treatment system. Hydrophilic vegetation observed in channel.
Prepared by:DAA Checked by:ALA
ores
-Location previously investigated as a seep.Monitoring has not indicated the presence of coal combustion residuals.
-Seep dispositioned via repair and/or non-flowing condition to potentially reach Waters of the U.S.,or other,as noted.
All monitoring shall be conducted per the requirements found in Attachment B of the Special Order by Consent.
UT-Unnamed Tributary
----No inspection necessary,sampling location only
pg/L-micrograms per liter
2B-15A NCAC 02L.0202 Standard
CCR-Coal Combustion Residuals
mg/L-milligrams per liter
NA-Not Applicable
ng/L-nanograms per liter
NPDES-National Pollutant Elimination System
S.U.-Standard Units
SOC-Special Order by Consent
TDS-Total Dissolved Solids
Page 2 of 2

2019 Annual Seep Report April 2020
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Belews Creek Steam Station-Duke Energy Carolinas,LLC SynTerra
APPENDIX A
PHOTOGRAPHS

. 2019 Annual Seep Report April 2020
Belews Creek Steam Station-Duke Energy Carolinas,LLC SynTerra
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S-01 View of dispositioned seep location facing northwest
Page 1 of 17

2019 Annual Seep Report April 2020
Belews Creek Steam Station-Duke Energy Carolinas,LLC SynTerra
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Page 2 of 17

2019 Annual Seep Report April 2020
Belews Creek Steam Station-Duke Energy Carolinas,LLC SynTerra
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2019 Annual Seep Report April 2020
•
Belews Creek Steam Station-Duke Energy Carolinas,LLC SynTerra
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Page 4 of 17

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Page 5 of 17

2019 Annual Seep Report April 2020
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Page 6 of 17

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2019 Annual See Re ort April 2020
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P StationP -Duke Energy Carolinas,LLC
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Page 8 of 17

2019 Annual Seep Report April 2020
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Page 9 of 17

2019 Annual Seep Report April 2020
Belews Creek Steam Station-Duke Energy Carolinas,LLC SynTerra
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Page 10 of 17

2019 Annual Seep Report April 2020
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2019 Annual Seep Report April 2020
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2019 Annual Seep Report April 2020
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2019 Annual Seep Report April 2020
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Page 15 of 17

April 2020
2019 Annual Seep Report
Belews Creek Steam Station-Duke Energy Carolinas,LLC SynTerra
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Page 16 of 17

2019 Annual Seep Report April 2020
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S-18 View of seep location facing northwest. Monitored via the NPDES permit.
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