NC0003425_Report_20190424

1 DUKE James Wells
ENERGY Vice President
Environmental,Health and Safety
Programs&Environmental Sciences
526 South Church Street
Mail Code EC13K
Charlotte,NC 28202
[phone]
April 24, 2019
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
2018 Annual SeepSurvey Report
P
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 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 24, 2019
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(980) 373-7892 relative to the annual seep
inspection report.
Sincerely,
James ells
Vice P esident,Environment, Health& Sa -
Progr s and Environmental Sciences
Duke Energy
Attachment:
Roxboro Steam Electric Plant 2018 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
2018 ANNUAL SEEP REPORT
ROXBORO STEAM ELECTRIC PLANT
EMC SOC WQ S18-005
1700 DUNWAY ROAD
SEMORA, NC 27343
APRIL 2019
PREPARED FOR
DUKE ENERGY PROGRESS, LLC
�+•� D
ENERGY
PROGRESS
Erin N. Ki ey, EIT
Project Engineer
.71:)L , (tt,„41 /-
Craig dy, NC L 2 #1599
Senior Project Manager

2018 Annual Seep Report April 2019
Roxboro Steam Electric Plant, Duke Energy Progress,LLC SynTerra
TABLE OF CONTENTS
SECTION PAGE
1.0 INTRODUCTION 1
2.0 FINDINGS 3
2.1 General Observations 3
2.2 Impact of Decanting 3
2.3 Changes to Seep Status 3
3.0 REFERENCES 4
LIST OF FIGURES
Figure 1 SOC Locations and Inspection Areas
LIST OF TABLES
Table 1 SOC Locations and Descriptions-2018 Inspection
LIST OF APPENDICES
Appendix A Photographs
Page i

2018 Annual Seep Report April 2019
Roxboro Steam Electric Plant,Duke Energy Progress,LLC SynTerra
LIST OF ACRONYMS
AOW Areas of Wetness
CCR Coal Combustion Residuals
EAB East Ash Basin
EMC Environmental Management Commission
SOC Special Order by Consent
WAB West Ash Basin
Page ii

2018 Annual Seep Report April 2019
Roxboro Steam Electric Plant,Duke Energy Progress,LLC SynTerra
1.0 INTRODUCTION
On October 25, 2018, Craig Eady (NC L.G. #1599) of SynTerra inspected the Roxboro
Steam Electric Plant (Roxboro or the Site)for existing and potential new areas of
wetness (AOWs). The aforementioned activities were performed in accordance with
North Carolina EMC Special Order by Consent WQ #S18-005. 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 ins
pection observations include:
• No previously unidentified seeps were observed during the inspection.
• No notable changes to seep status were observed during this inspection.
• Decanting had not begun at the time of this inspection.
Page 1

2018 Annual Seep Report April 2019
Roxboro Steam Electric Plant,Duke Energy Progress,LLC SynTerra
Inspection Details
Weather during and preceding the inspection was clear. Temperatures ranged from
approximately 40 to 55 degrees F. No precipitation was recorded on the day of the
inspection or the three days before the inspection according to the onsite rain gage.
The inspector reviewed previous AOW 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. Prior to the
inspections, Mr. Mueseen, Mr. Eric Cleaver (CCP Implementation Manager, Roxboro
Plant), and Mr. Robert Howard (Environmental Coordinator, Roxboro Plant) were
interviewed concerning 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 SOC inspection.
The inspection included observations in the following areas (Figure 1):
• West Ash Basin (WAB) dam and chimney drains
• Areas northeast of the WAB dam
• Southern half of the sluice lines access area
• The effluent discharge canal from the WAB extension impoundment to the
Heated Water Discharge Pond
• The East Ash Basin (EAB) dam
• Areas proximate to the EAB dam to the southwest and northeast; eastern side of
the EAB/industrial landfill
• Effluent discharge canal from the EAB extension impoundment 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)
The inspection scope of work included a review of the areas identified as downgradient
of ash basins. SOC locations are shown on Figure 1. Observations noted during the
inspection are summarized on Table 1. Photographs of each seep location are included
in Appendix A.
Page 2

2018 Annual Seep Report April 2019
Roxboro Steam Electric Plant,Duke Energy Progress,LLC
SynTerra
2.0 FINDINGS
2.1 General Observations
Inspection observations are shown for each seep in Table 1. Details include:
• Water redirect activities were noted near the base of the EAB dam with the
installation of piping.
• Water levels in the Heated Water Discharge Pond, the Cooling Tower Pond, and
the Cooling Water Intake Canal were at normal levels. Water levels in the
WAB/EAB effluent discharge canals and the basin impoundments were noted at
water levels similar to previous inspections.
2.2 Impact of Decanting
Decanting of the ash basin at Roxboro had not yet begun at the time of this inspection.
2.3 Changes to Seep Status
Mr. Eady inspected each seep to evaluate whether it may 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.
Seeps dispositioned during 2018 were done so at the time of the SOC issuance. Table 1
lists those seeps dispositioned and the basis for disposition. Seeps identified as
dispositioned at Roxboro are S-10, S-11, S-12, and S-13. These dispositioned seeps will
continue to be inspected and evaluated for any change in flow conditons.
In general, there was no change in status of the dispositioned seeps and no change in
status of remaining seeps observed during this inspection.
Page 3

2018 Annual Seep Report April 2019
Roxboro Steam Electric Plant,Duke Energy Progress,LLC SynTerra
3.0 REFERENCES
North Carolina Department of Environmental Quality. (2018). Special Order by Consent
EMC SOC WQ S18-005.
•
Page 4

2018 Annual Seep Report April 2019
Roxboro Steam Electric Plant,Duke Energy Progress,LLC SynTerra
FIGURE

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2018 Annual Seep Report April 2019
Roxboro Steam Electric Plant,Duke Energy Progress,LLC SynTerra
TABLE

TABLE 1
SOC LOCATIONS AND DESCRIPTIONS-2018 INSPECTION
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS,LLC,SEMORA,NC
Location Coordinates Receiving
Facility Sample ID Receiving Waterbody Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection
Latitude Longitude Classification
Heated Water Discharge NA-Not a NA-Seep contribution
Chimney drain discharge from active ash basin NA-Not a Classified Very low flow to stagnant conditions.Algae and
Roxboro S-Ol 36.477043 -79.076467 Pond flowing to NPDES Classified dam to Heated Water Discharge Pond analyzed in NPDES Surface Water organic floc.Biofllm in certain locations
permit outfall 003 Surface Water Permit monitoring
Heated Water Discharge NA-Not a NA-Seep contribution Debris from the pipe intake was removed to allow
Chimney drain discharge from active ash basin analyzed In NPDES NA-Not a Classified pipe.flow through 1" Flow is low but can sample
Roxboro S-02 36.477055 -79.076727 Pond flowing to NPDES Classified dam to Heated Water Discharge Pond y Surface Water 9 p
permit outfall 003 Surface Water Permit monitoring from pipe.
Heated Water Discharge NA-Not a NA-Seep contribution
Roxboro S-03 36.476994 -79.076978 Pond flowing to NPDES Classified Chimney drain discharge from active ash basin analyzed In NPDES NA-Not a Classified Flow sufficient for sample collection and flow
permit outfall 003 Surface Water dam to Heated Water Discharge Pond Permit monitoring Surface Water measurement.
Heated Water Discharge NA-Not a NA-Seep contribution
Roxboro 5-04 36.476923 -79.077204 Pond flowing to NPDES Classified Chimney drain discharge from active ash basin analyzed in NPDES NA-Not a Classified Low flow and sufficient to sample based.Orange
permit outfall 003 Surface Water dam to Heated Water Discharge Pond Permit monitoring Surface Water floc and staining.
Heated Water Discharge NA-Not a NA-Seep contribution With the exception of a small,stagnant puddle at
Roxboro S-05 36.476751 -79.077412 Pond flowing to NPDES Classified Chimney drain discharge from active ash basin analyzed In NPDES NA-Not a Classified the base of the rip-rap,the channel was dry and
permit outfall 003 Surface Water dam to Heated Water Discharge Pond Permit monitoring Surface Water no sample was collected.
Heated Water Discharge NA-Not a NA-Seep contribution Very low flow to stagnant conditions.No orange
Roxboro S-06 36.47669 -79.077643 Pond flowing to NPDES Classified Chimney drain discharge from active ash basin analyzed in NPDES NA-Not a Classified floc or iron staining but very slight algae in
permit outfall 003 Surface Water dam to Heated Water Discharge Pond Permit monitoring Surface Water puddled areas.
Heated Water Discharge NA-Not a NA-Seep contribution Orange iron oxide staining present on concrete.
Chimney drain discharge from active ash basin NA-Not a Classified
Roxboro S-07 36.476736 -79.077954 Pond flowing to NPDES Classified dam to Heated Water Discharge Pond analyzed in NPDES Surface Water Very low flow,insufficient for sample collection
permit outfall 003 Surface Water Permit monitoring and measurement.Some biofilm on pooled areas
Very low to negligible flow observed at bank.
Seepage area approximately 30 feet west of
Heated Water Discharge NA-Not a chimney drain#7.Drainage/flow is to the Heated NA-Seep contribution Minor drops with iron floc and staining noted on
Roxboro S-08 36.476719 -79.078064 Pond flowing to NPDES Classified Water Discharge Pond.This non-constructed seep analyzed in NPDES NA-Not a Classified soil surface.Insufficient flow to sample.Area
permit outfall 003 Surface Water flows to a portion of an NPDES wastewater Permit monitoring Surface Water appears much drier than past inspections.
treatment system. Wet/marshy area remains towards the western
side of the dam.
Water was clear with no observable aerobic
NA-Seep contribution See page 6 of this bacteria,flor,or iron-oxidation on the vegetated
Roxboro S-09 36.47823 -79.056076 UT to Hyco Lake WS-V;B Discharge from extension of East Ash Basin. analyzed In NPDES Attachment A of Roxboro substrate.Unable to get to exact 5-09 location
Permit monitoring SOC document. due to reed overgrowth,area not maintained.
Sufficient flow to sample near S-09 based on
coordinates.
NA-Not a Minimal AOW with no flow located on northern NA-Seep A ditch that directs stormwater flow during heavy
Roxboro 5-10** 36.479169 -79.056963 Extension of East Ash Basin Classified portion of East Ash Basin berm.Any flow would dispositioned NA-Seep dispositioned or sustained precipitation events.Area was dry.
Surface Water drain to extension of east ash basin.
l NA-Not a Minimal AOW with no flow located on northern NA-Seep
Roxboro S-1.1** 36.478569 -79.056737 Extension of East Ash Basin Classified portion of East Ash Basin berm.Any flow would dispositioned NA-Seep dispositioned A vegetated area.Dry during inspeciton.
Surface Water drain to extension of east ash basin.
SOC Tebles_ALLnnel_2019_04_17 Page 1 of 3

TABLE 1
SOC LOCATIONS AND DESCRIPTIONS-2018 INSPECTION
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS,LLC,SEMORA,NC
Location Coordinates Receiving - -
Facility Sample ID Receiving Waterbody Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection
Latitude Longitude p
Classification
NA-Not a Minimal AOW with no flow located on northern NA-Seep
Roxboro 5-12** 36.478103 -79.056735 Extension of East Ash Basin Classified portion of East Ash Basin berm.Any flow would dispositioned NA-Seep dispositioned Dry during inspection.
Surface Water drain to extension of east ash basin.
Not a seep.Outfall of culvert channeling flow from See page 6 of this See page 6 of this Strong,steady flow from both culverts.Water was
Roxboro S-13** 36.486175 -79.059612 Hyco lake WS-V;B UT on east side of facility that receives flow from Attachment A of Attachment A of Roxboro clear.Slight iron staining inside of concrete
East Ash Basin extension and S-21.Flows to Roxboro SOC
facility water intake channel(Hyco Lake). document. SOC document. culverts
Location is the end of the 24"pipe draining a
boggy area south of the gypsum pad.Pipe extends
Heated Water Discharge NA-Not a under the pad towards the northwest,under NA-Seep contribution Strong flow,no biofilm as had been observed at
Roxboro 5-14 36.483738 -79.063751 Pond flowing to NPDES Classified railroad tracks,with discharge to a ditch that analyzed in NPDES NA-Not a Classified
9 y Surface Water previous inspections.Significant reed and
permit outfall 003 Surface Water drains to the Heated Water Discharge Pond.This Permit monitoring vegetation growth around culvert and ditch. I
non-constructed seep flow to a portion of an
NPDES wastewater treatment system.
Seepage to wet area north of active ash basin. Quarterly monitoring at
Small stream flowing to Flows north Into a waterbody flowing into Heated Hardness 1200 mg/L Algae growth in substrate with biofilm on water
Roxboro S-18 36.477947 -79.073728 Heated Water Discharge WS-V;B(Hyco Water Discharge Pond.Waterbody is potentially point prior to flowing TDS 1600 mg/L surface observed.Sufficient flow for sam lin at Pond I-
Lake) WOTUS.This non-constructed seep flows to a into Heated Water Sulfates 1000 mg/L beam E-71. p 9
portion of an NPDES wastewater treatment system. Discharge Pond.
AOW with minimal flow located adjacent to the S-
Heated Water Discharge NA-Not a 01 chimney drain at the east end of the 1973 ash
9 NA-Seep contribution
Roxboro S-19 36.4771755 -79.07639 Pond flowingto NPDES Classified basin dam.Any flow moves toward the Heated NA-Not a Classified
Water Discharge Pond.This is non-constructed analyzed in NPDES Surface Water No flow or saturated soil observed.
permit outfall 003 Surface Water seep flows to a portion of an NPDES wastewater Permit monitoring
treatment system.
Seep flow to small stream channel northeast of
West Ash Basin dam Drains west through wetland Quarterlymonitoringat
Small stream flowing to g Hardness 1200 mg/L Stagnant conditions observed near AOW sign.
Roxboro 5-20 36.47799 -79.0749 Heated Water Discharge WS-V;B(Hyco to Heated Water Discharge Pond.No sample data point prior to flowing Biofilm,orange floc and algae buildup.Sufficient
9 TDS 1600 mg/L g
Pond Lake) due to lack of flow.This non-constructed seep into Heated Water flow for sampling available closer to the Heated
portion of an NPDES wastewater Discharge Pond. Sulfates 1000 mg/L
flows to a
9 Water Discharge Pond.
treatment system.
Monitoring of UT to Small drainage channel from a storm water
Seep emerging downgradient of storm water basin Hardness 1000 mg/L
Hyco Lake at collection basin.Minimal flow emerging from seep.
Roxboro S-21 36.48246 -79.0559 UT to H co Lake WS-V;B(Hyco below East Ash Basin.Flow drains adjacent to East TDS 1000 mg/L Ponded areas within channel have very
y established Duke
Lake) Ash Basin effluent channel from point of Sulfates 1000 mg/L low flow
emergence to UT to Hyco Lake. Energy S-13 Copper 5 pg/L between them.Algae,iron floc,and abundant leaf
monitoring location. litter observed within channel.
Located just east of the cooling tower ponds. Saturated conditions have promoted the growth of
Heated Water Discharge NA-Not a Wetness emerges from several points on the hill
9 NA-Seep contribution Phragmites In the area.Several distinct
Roxboro 5-22 36.48184 -79.0657 Pond flowingto NPDES Classified side area.Minimal flow could eventually reach NA-Not a Classified
analyzed In NPDES emergencepoints were observed along
outfall 003 Surface Water Outfall 003.No sample data to date due to lack of Surface Water 9 u the west
permitflow.This non-constructed seep flows to a portion Permit monitoring side of the asphalt road.Flow is low but steady,
of an NPDES wastewater treatment system. divides along road with discharge to both ponds.
SOC Tablea_ALLFlna 1_2019_01 1)
Page 2 of 3

•
TABLE 1
SOC LOCATIONS AND DESCRIPTIONS-2018 INSPECTION
ROXBORO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS,LLC,SEMORA,NC
Location Coordinates Receiving
Facility Sample ID Receiving Waterbody Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection
Latitude Longitude Classification
Located on sloped area along the southwest end of
the East Ash Basin dam.Large AOW but with little
Heated Water Discharge NA-Not a to no flow.Diffuse flow is directed to channel with NA-Seep contribution Very saturated soil.No flow channel.Water
Roxboro S-23 36.48035 -79.0685 Pond flowing to NPDES Classified discharge to Heated Water Discharge Pond and analyzed in NPDES NA-Not a Classified flowing in rip rap storm drain.Thick grass and
permit outfall 003 Surface Water Outfall 003.No sample data to date due to lack of Permit monitoring Surface Water phragmites abundant.
flow.This non-constructed seep flows to a portion
of an NPDES wastewater treatment system.
Prepared by:jOf Checked by:QIO
flutsE:
•-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.5.,or other,es noted.Monitoring shall be conducted at the approximate locations Indicated on the attached site map.
All monitoring shall be conducted par the requirements found in Attachment B of this Order.
pg/L-micrograms per liter
mg/L-mllograms per liter
NA-Not Applicable
NPDES-National Pollutant Discharge System
SOC-Special Order by Consent
UT-Unnamed Tributary
TD5-Total Dissolved Solids
SOC Tables_ALL_Final_2019_09_17 Page 3 of 3

2018 Annual Seep Report April 2019
Roxboro Steam Electric Plant,Duke Energy Progress,LLC SynTerra
APPENDIX A
PHOTOGRAPHS

2018 Annual Seep Report April 2019
Roxboro Steam Electric Plant,Duke Energy Progress, LLC synTerra
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2018 Annual Seep Report April 2019
Roxboro Steam Electric Plant,Duke Energy Progress,LLC SynTerra
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2018 Annual Seep Report April 2019
Roxboro Steam Electric Plant,Duke Energy Progress,LLC SynTerra
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2018 Annual Seep Report April 2019
Roxboro Steam Electric Plant,Duke Energy Progress,LLC SynTerra
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2018 Annual Seep Report April 2019
Roxboro Steam Electric Plant,Duke Energy Progress,LLC SynTerra
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S-11 View of dispositioned seep location facing southwest.
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S-12 View of dispositioned seep location facing southwest.
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S-14 View of seep location facing northeast.
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S-19 View of seep location facing northwest.
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