NC0003425_Annual Report_20200423

4aN DUKE RECEIVED James Wells
Vice President
ENERGY. Environmental,Health and Safety
MAY 0 1 2020 Programs&Environmental Sciences
526 South Church Street
Charlotte,NC 28202
NCDEQ/DWR/NPDES [phone]
April 23, 2020
Via Overnight Mail
Rick Bolich
Raleigh Regional Office Regional Supervisor
North Carolina Department of Environmental Quality
Division of Water Resources
1628 Mail Service Center
Raleigh, NC 27609
Bob Sledge
North Carolina Department of Environmental Quality
Division of Water Resources
Water Quality Permitting Program
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Report Under Special Order by Consent—EMC SOC WQ S 18-005
Duke Energy Progress, LLC - Roxboro Steam Electric Plant
NPDES Permit NC0003425
2019 Annual Seep Survey Report
Dear Messrs. Bolich and Sledge:
On behalf of Duke Energy Progress, LLC (DEP), I am submitting to you the Roxboro Steam
Electric Plant Annual Seep Report summarizing the findings of the comprehensive survey as
required by Special Order by Consent (SOC), SOC No. S 18-005 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. Bolich and Sledge
April 23, 2020
Page 2
Please direct any questions concerning the Roxboro Steam Electric Plant SOC No. S 18-005 to
Lori Tollie at [phone] and to Chris Hallman at [phone] relative to the annual seep
inspection report.
Sincerely,
James ells
Vice Pre 'dent, Environment, Health & Safety-
Programs and Environmental Sciences
Duke Energy
Attachment:
Roxboro Steam Electric Plant 2019 Annual Seep Survey
CC: Richard Baker, Duke Energy
Lori Tollie, Duke Energy
Chris Hallman, Duke Energy
Robert Howard, Duke Energy
Paul Draovitch, Duke Energy
Matt Hanchey, Duke Energy

synTerra
2019 ANNUAL SEEP REPORT
ROXBORO STEAM ELECTRIC PLANT
EMC SOC WQ S18-005
1700 DUNNAWAY ROAD
SEMORA, NC 27343
APRIL 2020
PREPARED FOR
efiN DUKE
ENERGY
PROGRESS
DUKE ENERGY PROGRESS, LLC
K e ing
Project ientist
—31), • IL
Cr ' ady, NC LG 1 99
Senior Project Manager

2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress, 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 Effects 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 Areas
LIST OF TABLES
Table 1 SOC Locations and Descriptions—April 2019
LIST OF APPENDICES
Appendix A Photographs
Page i

• 2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
LIST OF ACRONYMS
EAB East Ash Basin
EMC Environmental Management Commission
SOC Special Order by Consent
WAB West Ash Basin
Page ii

• 2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
1.0 INTRODUCTION
On February 28, 2019, Craig Eady (NC L.G. #1599) of SynTerra inspected the Roxboro
Steam Electric Plant(Roxboro or Site) property for existing and potential new seeps.
Inspection activities were performed in accordance with North Carolina Environmental
Management Commission (EMC) Special Order by Consent(SOC) WQ #S18-005. The
Special Order by Consent 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 inspection observations include:
• No previously unidentified seeps were observed during the inspection.
• No notable changes to seep status were observed during this inspection.
• Passive decanting (removal) of free water from the West Ash Basin (WAB)began
in December 2018 through the cessation of sluicing to the WAB.
1.1 Inspection Details
The weather was clear before and during the inspection. Temperatures ranged from
approximately 43 to 60 degrees Fahrenheit (F). No precipitation was recorded on the
day of the inspection or the three days before the inspection, according to the on-Site
weather station. Five days prior to the inspection, on February 23, 2019, 2.34 inches of
precipitation were measured, and on February 24, 2019, 0.14 inches were measured.
The inspector reviewed previous seep inspection reports and the weekly dam safety
inspection reports for each ash basin. Jake Muessen (Duke Energy system owner)
conducted the ash basin dam safety inspections and prepared the reports. Before the
inspections, Mr.Jake Muessen (System Owner) and Mr. Eric Cleaver
Page 1-1

2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
(CCP Implementation Manager) were interviewed about recent rainfall,
construction/stabilization projects associated with the ash basins, and general Site
conditions in and around the ash basins. 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):
• WAB main dam and chimney drains
• Areas northeast of the WAB dam
• Southern half of the WAB sluice lines access area
• The effluent discharge canal from the WAB extension impoundment to the
heated water discharge pond
• The East Ash Basin (EAB) main dam
• Areas proximate to the EAB main dam to the southwest and northeast; eastern
side of the EAB/industrial landfill
• Effluent discharge canal from the EAB extension impoundment area to the east
side of the gypsum storage area
• Area between the south side of the industrial landfill and unnamed tributary
• Southwestern and eastern sides of the industrial landfill (south of the EAB
extension impoundment area)
• Areas identified as downgradient of ash basins
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.
Page 1-2

• 2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
2.0 FINDINGS
2.1 General Observations
Inspection observations of each seep are described in Table 1. A summary of the details
includes:
• No new seeps were observed during the inspection.
• No previously unidentified or unreported pipes were observed during
inspection.
• Flow conditions at seeps were normal and generally consistent with previous
inspections.
• Water levels in the heated water discharge pond, the unit 3 cooling tower pond,
and the cooling water intake canal appeared slightly above normal.
• Water levels in the WAB/EAB effluent discharge canals and the basin
impoundments were noted at slightly elevated levels.
2.2 Effects of Decanting
Passive decanting of free water from the WAB began in December 2018 through the
cessation of sluicing to the WAB. The annual seep inspection occurred approximately
two months after decanting commenced. There were no noticeable effects to seep flow
related to decanting during the inspection.
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 the inspection.
Page 2-1

• 2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
3.0 REFERENCES
North Carolina Department of Environmental Quality. (2018). Special Order by Consent
P �' p
EMC SOC WQ S18-005.
Page 3-1

• 2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
FIGURES

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�� "-�„�-" NON-CONSTRUCTED SEEP (APPROXIMATE)
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roe-� U �. .,,..
I �• -. _ ASH BASIN WASTE BOUNDARY
WEST ASH""°
' ... �./ "�"-."�„ -� ASH BASIN COMPLIANCE BOUNDARY
�.. ' BASIN , „'
SOLID WASTE LANDFILL BOUNDARY
• A:w /` -DUKE ENERGY PROGRESS PROPERTY LINE
EFFLUENT DISCHARGE CANAL
I J 1•-_:7 WETLAND (AMEC NRTR)
"
.......
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INSPECTION""1 SPECIAL ORDER BY CONSENT (SOC)
AREA
- .,rr. d 4 NOTES:
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•
• r 1.SPECIAL ORDER BY CONSENT(SOC)LOCATIONS ARE DESCRIBED IN EMC SOC WO S18-005.
•• ..- "/ a mom.
`� a FILTER DIKE qr- 2.NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM(NPDES)LOCATIONS ARE
"d , DESCRIBED IN PERMIT NC00034245.
• /� �.` a' -y .� � 3.ALL BOUNDARIES ARE APPROXIMATE.
_ ♦ /' :,., 4 PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY PROGRESS,LLC.
` "-�"�►. , " "R 5.SAMPLE LOCATIONS WERE DERIVED FROM VARIOUS SOURCES AND AREA MIX OF
• ,t ' SURVEYED AND APPROXIMATE LOCATIONS.THEREFORE,SAMPLE LOCATIONS ARE TO BE
x
h , < DEEMED APPROXIMATE.
1- ; ,
... 6.THE WATERS OF THE US DELINEATION HAS NOT BEEN APPROVED BY THE US ARMY CORPS
�� ..,.rn, y�`T ,ro ' OF ENGINEERS AT THE TIME OF MAP CREATION THI6 MAP IS A PRELIMINARY
,„,�- 1 JURISDICTIONAL DETERMINATION ONLY THE PRELIMINARY WETLANDS AND STREAMS
„ , .,, ,„.„A • i BOUNDARIES WERE OBTAINED FROM AMEC FOSTER WHEELER ENVIRONMENTAL&
I
• 9 g , , C*'`» " INFRASTRUCTURE,INC.NATURAL RESOURCES TECHNICAL REPORT(NRTR)FOR ROXBORO
�, ^�• ��> STEAM ELECTRIC PLANT DATED JUNE 2015.
y ,,. J .: �Jl,4 -
J 7.AERIAL PHOTOGRAPHY OBTAINED FROM GOGGLE EARTH PRO ON OCTOBER 11,2017.
_- e AERIAL WAS COLLECTED ON JUNE 13,2016.
gym_
w. ,+ ,: t s„R. ,. 8.DRAWING HAS BEEN SET WITH A PROJECTION OF NORTH CAROLINA STATE PLANE
• = • - - COORDINATE SYSTEM FIPS 3200(NAD83).
a
•• ..�► I•• '• GRAPHIC SCALE
FIGURE 1
�•-/ .� t•-•-k (' DUKE 675 0 675 1.350 SOC LOCATIONS AND (INSPECTION AREAS
1 $• _ ENERGY (IN FEET)
�:-�,%�� "'�-- -' PROGRESS DRAWNBY:J.KIRT2 DATE:05/03/2019 2019 ANNUAL SEEP REPORT
' 4 I REVISED BY:C.ALMOND DATE:03/23/2020
^r-'' \N.
�� ROXBORO STEAM ELECTRIC PLANT
CHECKED BY:K.CAWING DATE:03/23/2020
APPROVED BY.K.CAWING DATE:03/23/2020 SEMORA, NORTH CAROLINA
"'J I �mTerra PROJECT MANAGER C EADY
� �'7' ' www.s nterracor..corn

• 2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
TABLES

TABLE 1
SOC LOCATIONS AND DESCRIPTIONS - FEBRUARY 2019
2019 ANNUAL SEEP REPORT
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Location Coordinates ReceivingReceiving
Facility Sample ID Waterbody Description SOC Monitoring Interim Action Notes from Inspection
Latitude Longitude Waterbody Classification Levels
Heated Water NA - Seep
Roxboro S O1 36.477043 79.076467 Discharge Pond NA - Not a Classified Chimney drain discharge from active ash basin dam to contribution analyzed NA - Not a Classified Very low, clear flow. Biofilm and orange floc present with algae growth on concrete
flowing to NPDES Surface Water Heated Water Discharge Pond in NPDES Permit Surface Water substrate.
permit outfall 003 monitoring
•
Heated Water NA - Seep
Roxboro S-02 36.477055 79.076727 Discharge Pond NA - Not a Classified Chimney drain discharge from active ash basin dam to contribution analyzed NA- Not a Classified Very low, clear flow. Biofilm and orange floc present with algae growth on concrete
flowing to NPDES Surface Water Heated Water Discharge Pond in NPDES Permit Surface Water substrate. No flow from 1" PVC pipe due to debris blocking intake.
permit outfall 003 monitoring
Heated Water NA - Seep
Roxboro S-03 36.476994 79.076978 Discharge Pond NA - Not a Classified Chimney drain discharge from active ash basin dam to contribution analyzed NA- Not a Classified Very low, clear flow. Minimal biofilm, orange floc present with algae growth on
flowing to NPDES Surface Water Heated Water Discharge Pond in NPDES Permit Surface Water concrete substrate.
permit outfall 003 monitoring
Heated Water NA - Seep
Roxboro S-04 36.476923 79.077204 Discharge Pond NA - Not a Classified Chimney drain discharge from active ash basin dam to contribution analyzed NA - Not a Classified Low, clear flow with no biofilm. Orange floc present with algae growth on concrete
flowing to NPDES Surface Water Heated Water Discharge Pond in NPDES Permit Surface Water substrate.
permit outfall 003 monitoring
Heated Water NA - Seep
Roxboro S 05 36.476751 79.077412 Discharge Pond NA - Not a Classified Chimney drain discharge from active ash basin dam to contribution analyzed NA - Not a Classified Very low to no flow, stagnant conditions. No orange floc or biofilm. Some green
flowing to NPDES Surface Water Heated Water Discharge Pond in NPDES Permit Surface Water algae growth on concrete substrate.
permit outfall 003 monitoring
Heated Water NA - Seep
Roxboro S-06 36.47669 79.077643 Discharge Pond NA - Not a Classified Chimney drain discharge from active ash basin dam to contribution analyzed NA - Not a Classified Very low flow to stagnant conditions in pooled areas. No orange floc or biofilm.
flowing to NPDES Surface Water Heated Water Discharge Pond in NPDES Permit Surface Water Some green algae growth on concrete substrate.
permit outfall 003 monitoring
Heated Water NA - Seep
Roxboro S-07 36.476736 79.077954 Discharge Pond NA - Not a Classified Chimney drain discharge from active ash basin dam to contribution analyzed NA - Not a Classified Low, clear flow. Minimal biofilm, orange floc present with algae growth on concrete
flowing to NPDES Surface Water Heated Water Discharge Pond in NPDES Permit Surface Water substrate.
permit outfall 003 monitoring
Heated Water Seepage area approximately 30 feet west of chimney NA - Seep Broad wet areas that collect, forming a small channel at confluence with heated
Roxboro S 08 36.476719 -79.078064 Discharge Pond NA - Not a Classified drain #7. Drainage/flow is to the Heated Water contribution analyzed NA- Not a Classified water dischargepond. Verylow flow (drippage)to NPDES Surface Water Discharge Pond. This non-constructed seep flows to a in NPDES Permit Surface Water g ( ppage) at confluence. Biofilm and orange
permit outfall 003 portion of an NPDES wastewater treatment system. monitoring floc/algae at confluence. Stagnant conditions in wet areas.
NA - Seep See page 6 of
Roxboro S-09 36.47823 -79.056076 UT to Hyco Reservoir WS-V; B Discharge from extension of East Ash Basin.
contribution analyzed attachment A of Unable to get to exact S-09 location due to abundant vegetation and higher water
in NPDES Permit Roxboro SOC S18- level within the impoundment creating marshy/boggy soil conditions.
monitoring 005 document.
Minimal AOW with no flow located on northern portion Ditch that directs stormwater flow during heavy or sustained precipitation events.
** Extension of East Ash NA - Not a Classified NA - Seep NA - Seep
Roxboro S-10 36.479169 -79.056963 Basin Surface Water of East Ash Basin berm. Any flow would drain to dispositioned dispositioned No measurable flow. No biofilm, orange floc, or algae. Rock substrate with some
extension of east ash basin. saturated soil in ditch.
Minimal AOW with no flow located on central portion of
Roxboro S-11** 36.478569 -79.056737 Extension of East Ash NA Not a Classified East Ash Basin berm. Anyflow would drain to NA Seep NA Seep
vegetated area.A
Basin Surface Water dispositioned dispositioned Dry during inspection.
extension of east ash basin.
Minimal AOW with no flow located on southern portion
** Extension of East Ash NA - Not a Classified NA - Seep NA - Seep
Roxboro S-12 36.478103 -79.056735 Basin Surface Water of East Ash Basin berm. Any flow would drain to dispositioned dispositioned A vegetated area. Dry during inspection. No saturated soil or channeling.
extension of east ash basin.
Page 1 of 2

TABLE 1
SOC LOCATIONS AND DESCRIPTIONS - FEBRUARY 2019
2019 ANNUAL SEEP REPORT
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, SEMORA, NC
Location Coordinates Receivin Receiving
Facility Sample ID Waterbod Waterbody Description SOC Monitoring Interim Action Notes from Inspection
Latitude Longitude y Classification Levels
Not a seep. Outfall of culvert channeling flow from UT See page 6 of See page 6 of
Roxboro S 13** 36.486175 79.059612 H co Reservoir WS-V; B on east side of facility that receives flow from East Ash attachment A of attachment A of
y Basin extension and S-21. Flows to facility water intake Roxboro SOC S18- Roxboro SOC S18- Strong, steady flow from both culverts. Water was clear.
channel (Hyco Reservoir). 005 document. 005 document.
Location is the end of the 24" pipe draining a boggy
Heated Water area south of the gypsum pad. Pipe extends under the NA - Seep
Discharge Pond NA - Not a Classified pad towards the northwest, under railroad tracks, with contribution analyzed NA- Not a Classified Strong flow from corrugated pipe. Significant reed and vegetation growth around
Roxboro S-14 36.483738 -79.063751 flowing to NPDES Surface Water discharge to a ditch that drains to the Heated Water in NPDES Permit Surface Water culvert and ditch. Very little orang floc absent of biofilm. Water is foamy in
permit outfall 003 Discharge Pond. This non-constructed seep flow to a monitoring locations.
portion of an NPDES wastewater treatment system.
Seepage to wet area north of active ash basin. Flows Quarterly monitoring
Small stream flowing north into a waterbody flowing into Heated Water at point prior to Hardness 1200 mg/L
WS-V; B Low, clear flow adequate for sample collection. Slight biofilm, orange floc and
Roxboro S-18 36.477947 -79.073728 to Heated Water Discharge Pond. Waterbody is potentially WOTUS. This flowing into Heated TDS 1600 mg/L
(Hyco Reservoir) non constructed seepflows to aportion of an NPDESalgae on hard-packed gravel/clay substrate.
Discharge PondWater Discharge Sulfates 1000 mg/L
9 p cked
9/
• wastewater treatment system. Pond.
Heated Water AOW with minimal flow located adjacent to the S-01 NA Seep
Discharge Pond NA - Not a Classified chimney drain at the east end of the 1973 ash basin contribution analyzed NA- Not a Classified
Roxboro S-19 36.477176 -79.0763902 dam. Any flow moves toward the Heated Water Dry conditions. No flow or saturated soil observed.
flowing to NPDES Surface Water in NPDES Permit Surface Water
permit outfall 003 Discharge Pond. This is non-constructed seep flows to monitoring
a portion of an NPDES wastewater treatment system.
Seep flow to small stream channel northeast of West Quarterly monitoring
Small stream flowing Ash Basin dam Drains west through wetland to Heated at point prior to Hardness 1200 mg/L Sufficient flow to sample below the S-20 seep, near a smaller, secondary channel
WS-V; B
Roxboro S-20 36.47799 -79.0749 to Heated Water Water Discharge Pond. No sample data due to lack of flowing into Heated TDS 1600 mg/L emerging from the northeast. Flow is low and clear. Slightly muddy substrate with
(Hyco Reservoir)
Discharge Pond flow. This non-constructed seep flows to a portion of Water Discharge Sulfates 1000 mg/L minimal leaf debris. No biofilm or orange floc/algae growth.
an NPDES wastewater treatment system. Pond.
Monitoring of UT to
Seep emerging downgradient of storm water basin Hardness 1000 mg/L
Hyco Reservoir at Small drainage channel from a storm water collection basin. Very low flow
Roxboro S 21 36.48246 -79.0559 UT to Hyco Reservoir WS-V; B below East Ash Basin. Flow drains adjacent to East Ash TDS 1000 mg/L
y (Hyco Reservoir) Basin effluent channel from point of emergence to UT established Duke Sulfates 1000 mg/L emerging from seep. Abundant leaf litter within channel. Biofilm and algae present
Energy S-13 with some orange floc. Low to stagnant conditions in pooled areas.
pg/L
Hyco Reservoir. Copper 5
monitoring location.
Located just east of the cooling tower ponds. Wetness
Flow emerges from a rise with multiple power poles east of the cooling tower
Heated Water emerges from several points on the hill side area. NA - Seep
Discharge Pond NA - Not a Classified Minimal flow could eventually reach Outfall 003. No contribution analyzed NA - Not a Classified pond. Very wet soil conditions and Phragmites. Flow crosses pavement as light
Roxboro S-22 36.48184 -79.0657 flowing to NPDES Surface Water sample data to date due to lack of flow. This non- in NPDES Permit Surface Water sheet flow and under pavement, daylighting on the west side with low flow along
constructed seep flows to a portion of an NPDES monitoring side of pavement within a small channel. Flow is muddy on a gravel substrate. No
permit outfall 003 algae or floc on west side. Significant algae, biofilm on east side with reeds.
wastewater treatment system.
Located on sloped area along the southwest end of the
Heated Water East Ash Basin dam. Large AOW but with little to no NA SeepArea is on west side of main dam adjacent to concrete storm water channel. Very
Discharge Pond NA Not a Classified flow. Diffuse flow is directed to channel with discharge contribution analyzed NA Not a Classified saturated soil conditions with standing, stagnant water. No channeling or flow.
Roxboro S-23 36.48035 -79.0685 flowing to NPDES Surface Water to Heated Water Discharge Pond and Outfall 003. No in NPDES Permit Surface Water Significant algae growth on soil/grass substrate. Wet conditions persist from end of
permit outfall 003 sample data to date due to lack of flow. This non- monitorin storm water concrete channel/rip rap downgradient to rip rap at perimeter of unit
constructed seep flows to a portion of an NPDES 9 3 heated water discharge pond.
wastewater treatment system.
Prepared by: KTL Checked by:CDE
Notes:
*-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. Monitoring shall be conducted at the approximate locations indicated on the attached site map.
All monitoring shall be conducted per the requirements found in Attachment B of SOC S18-005.
pg/L-micrograms per liter
mg/L-milligrams per liter
NA-Not Applicable
NPDES-National Pollutant Discharge Elimination System
PVC-polyvinyl chloride
SOC-Special Order by Consent
UT-Unnamed Tributary
TDS-Total Dissolved Solids
Page 2 of 2

2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
APPENDIX A
PHOTOGRAPHS

• 2019 Annual SeepReport P April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
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36.477055-79.07.6727 °'.
S-02 View of seep location looking south.
Page 1 of 10

• 2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
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Page 2 of 10

• 2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
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Page 3 of 10

•
• 2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
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S-07 View of seep location looking south.
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.4476719-79.078064 �` - ,t , xi.. t
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S-08 View of seep location looking north.
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Page 4 of 10

• 2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
I
y, q
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36.47823-79.05607:'
S-09 View looking east at seep area with high vegetation. II
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S-10 View of dispositioned seep location looking east.
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Page 5 of 10

• 2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
• - , . .fit,,
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S-11 View of dispositioned seep location looking east.
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36.478103-79,i ,
S-12 J View of dispositioned seep location looking east.
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Page 6 of 10

• 2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
E _
36.486175 -79.059612
5-13 View of the SOC sample location looking down from protective scaffolding.
Concrete culvert discharging to the north into the intake canal.
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S-14 View of seep location looking east.
Page 7 of 10

• 2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
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36.477947 .4 `; ,` 0.19 10 • 55
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S-1S View of the SOC sample location looking north.
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36.4771755-79.0763902 4 , h rre
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`,, S-19 View of seep location looking northwest.
Page 8 of 10

• 2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
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5-21 View of seep location looking Amain- als
Page 9 of 10

2019 Annual Seep Report April 2020
Roxboro Steam Electric Plant-Duke Energy Progress,LLC SynTerra
dA
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tor
S-22 View of seep location looking east.
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36.48035-79.068
S-23 View of seep location looking nort11,..1','
Page 10 of 10