NC0005088_Report_20190424

• cal 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
RECEIVE' ENRIDWR
Landon Davidson APR 2 9 2019
Asheville Regional Office Regional Supervisor
North Carolina Department of Environmental Quality Water Resources
Division of Water Resources Permit;ing Section
Water Resources - Water Quality Regional Operations
2090 U.S. 70 Highway
Swannanoa, NC 28778-8211
Bob Sledge
North Carolina Department of Environmental Quality
Water Quality Permitting Program
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
ReportUnderSpecialOrder byConsent— EMCWQ -
Sub�ect: SOC S 17 009
Duke Energy Carolinas, LLC — Rogers Energy Complex
NPDES Permit NC0005088
2018 Annual Seep Survey Report
Dear Messrs. Davidson and Sledge:
On behalf of Duke Energy Carolinas, LLC (DEC), I am submitting to you the Rogers Energy
Complex 2018 Annual Seep Survey Report summarizing the findings of the comprehensive survey
as required by the Rogers Energy Complex NPDES Permit NC0005088 Special Order by Consent
(SOC), SOC No. S 17-009 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. Davidson and Sledge
April 24, 2019
Page 2
Please direct any questions concerning the Rogers Energy Complex NPDES Permit NC0005088
SOC No. S 17-009 to Robert Wylie at [phone] and to Chris Hallman at [phone]
relative to the annual seep inspection report.
Sincerely,
ames lls
Vice Pre ident,Environment, Health& Safety-
Program and Environmental Sciences
Duke Energy
Attachment:
Rogers Energy Complex 2018 Annual Seep Survey
cc: Richard Baker, Duke Energy
Mike Disch, Duke Energy
Chris Hallman, Duke Energy
George Hamrick, Duke Energy
Paul Draovitch, Duke Energy
Matt Hanchey, Duke Energy

synTerra
2018 ANNUAL SEEP REPORT
ROGERS ENERGY COMPLEX
CLIFFSIDE STEAM STATION
EMC SOC WQ S17-009
573 DUKE POWER ROAD
MOORESBORO, NC 28114
APRIL 2019
PREPARED FOR
DUKE ENERGY CAROLINAS, LLC
(61N DUKE
Iry ENERGY.
CAROLINAS
Erin N. Kii •y, EIT
Project Engineer
Scott Spinner, NC LG #2243
Project Manager

2018 Annual Seep Report
April 2019
Rogers Energy Complex-Cliffside Steam Station,Duke Energy Carolinas,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
Rogers Energy Complex-Cliffside Steam Station,Duke Energy Carolinas,LLC SynTerra
LIST OF ACRONYMS
AOW Areas of Wetness
CCR Coal Combustion Residuals
EMC Environmental Management Commission
SOC Special Order by Consent
Page ii

2018 Annual Seep Report April 2019
Ro
gers ers Energ
y gy Complex-Cliffside Steam Station,Duke EnergyCarolinas,LLC SynTerra
ynTerra
1.0 INTRODUCTION
On May 9-10, 2018, Scott Spinner (NC L.G. #2243) and Chris Suttell (NC L.G. #2426) of
SynTerra inspected the Cliffside Steam Station (Cliffside or Site) for existing and
potential new areas of wetness (AOWs). The aforementioned activities were performed
in accordance with North Carolina Special Order by Consent EMC WQ #S17-009. That
Special Order by Consent(SOC) describes
inspection requirements as follows:
P
Duke Energy shall conduct annual comprehensive surveys of areas down gradient of ash
basins identifying nezu 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.
• Decanting had not begun at the time of this inspection.
Inspection Details
Weather during the inspection was clear and no precipitation occurred. Overnight
between May 7 and May 8, 0.11" of rain fell according to the onsite rain gage.
Temperatures ranged from approximately 70 to 80 degrees F.
The inspectors reviewed previous AOW inspection reports and the weekly dam safety
inspection reports for each ash basin.Jessica Snyder, P.E. (Duke Energy system owner)
conducted the ash basin dam safety inspections and prepared the reports. Ms. Snyder
and Mr. Steve Hodges (Duke Energy Site Environmental Coordinator) were
interviewed concerning recent rainfall amounts, recent construction/stabilization
projects associated with the ash basins, and general site conditions in and around the
Page 1

2018 Annual Seep Report April 2019
Rogers Energy Complex- Cliffside Steam Station,Duke Energy Carolinas,LLC SynTerra
ash basins. Observations from the dam safety inspection reports were consistent with
observations made during the SOC inspections.
The inspection included observations in the following areas (Figure 1):
• Along the Broad River north of the Inactive Unit 5 Ash Basin
• Between Inactive Unit 5 Ash Basin and Unit 5
• Along the Broad River northeast of the Former Units 1-4 Ash Basin
• Alongthe Broad River north of the Ash Storage Area
g
• Along the Broad River north of the Active Ash Basin
• Alongthe eastern bank of the Suck Creek adjacent the Active Ash Basin
l
The inspection scope of work also 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
Rogers Energy Complex-Cliffside Steam Station,Duke Energy Carolinas,LLC SynTerra
2.0 FINDINGS
2.1 General Observations
Inspection observations are shown for each seep in Table 1. Details include:
• AOW conditions were found to be generally similar to conditions in previous
inspections
• Seeps S-37 and S-38 were identified as a part of the 2019 inspection.
2.2 Impact of Decanting
Decanting of the ash basin at Cliffside had not yet begun at the time of this inspection.
2.3 Changes to Seep Status
Mr. Spinner and Mr. Suttell 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 ofthis Special Order, "dispositioned"P rP Pincludes 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 Cliffside are S-01, S-05, S-08, S-09, S-10, S-11, S-12,S-13, S-17, S-20,S-22,
S-24, S-25, S-26, S-33, S-34, and S-35. 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.
Seeps S-37 and S-38 were identified as a part of the 2019 inspection. Information
regarding these seeps will be presented in the 2019 Annual Seep Report.
Page 3

2018 Annual Seep Report April 2019
Rogers Energy Complex-Cliffside Steam Station,Duke Energy Carolinas,LLC SynTerra
3.0 REFERENCES
NCDEQ. (2018). Special Order by Consent EMC SOC WQ S17-009.
Page 4

2018 Annual Seep Report April 2019
Rogers Energy Complex-Cliffside Steam Station,Duke Energy Carolinas,LLC SynTerra
FIGURE

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},N -• • ACTIVE
>r '" ,. UNITS •( `, ASH BASIN _-- ASH BASIN WASTE BOUNDARY
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•,1 -ASH BASIN COMPLIANCE BOUNDARY
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LANDFILL IASM STORAGE AREA BOUNDARY
'' �BBB(AAA k LANDFILL COMPLIANCE BOUNDARY
'� `• —••DUKE ENERGY CAROLINAS CLIFFSIDE PUNT SITE BOUNDARY
- ^a � ) ? -►--STREAM(AMEX NRTR 2015)
/
;� -1 �: �y .1 /)' .FTLAND(AMEC NRTR 2015)
\- } 1 ( \1 SUCKOREEK .I\ - SPECIAL ORDER BY CONSENT(SOC)INSPECTION AREA
{y.a [ C -'.NOTES:
'\ ,'q. - - .','SPECIAL ORDER BY CONSENT(SOX)LOCATIONS ARE DESCRIBED IN EMC S.WO
' I.N.
S12-009
`� 'NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM(NPDES)LOCATIONS RAE
\• '.a\ i) " .,+ •DESCRIBED IN PERMIT NC000508B.
,,` `�` r,, `• •; •
NATURAL RESOURCES TECHNICAL REPORT INRTR)WAS PREPARED BVAMEC
•� `y FOSTER WHEELER INC,DUNE 19,2013
a\a�-.�,- �� - ` SAMPLE LOCATIONS WERE DERIVED FROM VARIOUS SOURCES AND ARE A MIX OF
I . .• +'fie
•
•-"•�--...,,,-„tea--• 7.-- - SURVEYED AND APPROXIMATE LOCATIONS.THEREFORE,SAMPLE LOCATIONS ARE
•���•�. TO BE DEEMED APPROXIMATE.
T. \a SPOIL AREA YNLS PREVIOUSLY REFERRED TORS THE EASTERN ASH STORAGE AREA.
'R• � BASED ON DATA AND INFORMATION RECEIVED TO DATE.NO ASH IS LOCATED IN THE
,i•'.,. - V. • SPOIL AREA THEREFORE,THE WASTE BOUNDARY HAS BEEN REMOVED FROM
aa AROUND THIS AREA.
/8M. 4 +�;_ ! PROPERTY BOUNDARY PROVIDED BY DUKE ENERGY CAROLINAS.
41t +/y R^ L PHOTOGRAPHY OBTAINED FROM GOOGLE EARTH PRO ON SEPTEMBER 2.
- "4Lc " V 201B.IMAGE COLLECTED ON APRIL 20.2018.
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2018 Annual Seep Report April 2019
Rogers Energy Complex-Qiffside Steam Station,Duke Energy Carolinas,LLC SynTerra
•
TABLE

TABLE 1
SOC LOCATIONS AND DESCRIPTIONS-2018 INSPECTION
ROGERS ENERGY COMPLEX-CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS,LLC,MOORESBORO,NC
Location Coordinates Receiving
Facility Sample ID Receiving Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection
Latitude Longitude Waterbody
Classification
Steadyflow within 3 foot wide stream Iron oxidizing bacteria apparent on substrate near
the outlet of the draw.Slightly more flow than
Cliffside 5-01* 35.215639 -81.775344 Broad River WS-IV located northwest of inactive Unit 5 Ash NA-Seep Dispositioned NA-Seep Dispositioned previously observed.Steady stable flow consistentely
Basin. within a well-defined channel.
Seep drainage in wetland area via 1-2 foot
pH 5-10 S.U.
wide stream channel,located north of the
Hardness 800 mg/L
inactive Unit 5 ash basin.Drainage collects Monitoring at established
Cliffside S-02 35,217217 -81.768678 UT to Broad River WS-IV seep flows from S-18,S-19 and S-19A. Duke Energy S-02 Mercury 0.1 pg/L Flow is steady and clear.Orange aerobic
Flows north to the Broad River at a point monitoring site Sulfates 500 mg/L bacteria/floc/Iron-oxidation apparent on substrate.
approximately 50 feet downstream of the TDS 1000 mg/L
Thallium 0.5 pg/L
Inactive Unit 5 Ash Basin discharge outfall.
Some white precipitate is present on substrate and
within water.Three pipes observed from the bank.
Minor seepage and groundwater influence Two pipes are 6"terracotta and are dry.One pipe is
from closed Units 1-4 ash basin area to a 10"corrugated steel pipe that has corroded at the
Broad River Instream
Cliffside 5-03 35.22001 -81.7577 Broad River WS-IV sample point within former condenser Monitoring NA-2B Standards Apply base.Seepage emerges from the bank below the
circulating water(CCW)discharge canal for pipe.Flow is steady from below the steel pipe and
retired units 1-4. orange aerobic bacteria/floc/iron-oxidation is
apparent on substrate.Flow is steady but relatively
low(approximately 50-100 mL/minute).
Intermittent flow within a braided streat that may
Diffuse flow emerging from a small area migrate laterally depending on scouring and
Cliffside 5-05* 35.218147 -81.749844 Broad River WS-IV along the bank of the Broad River and base NA-Seep Dispositioned NA-Seep Dispositioned deposition cycles from river fluctuation.Orange
of the active ash basin. floc/iron-oxidizing bacteria on sandy substrate.
Minimal flow.
Steady,clear and braided stream that flows Monitoring at established Flow infiltrates at berm between river and stream.
Cliffside S-07 35.2113642 -81.745975 UT to Broad River WS-IV in a relatively level area northeast of the Duke Energy S-07 pH 5-10 S.U. Overland flow discharge to the river was not
active ash basin at edge of property line. monitoring site observed by land or boat.
Flow is north to Broad River.
Cliffside S-08* 35.208547 -81.755781 Suck Creek WS-IV Natural conveyance tributary to Suck Creek NA-Seep Dispositioned NA-Seep Dispositioned Silty and sandy substrate with no apparent floc/iron-
oxidation.Less flow than previously observed.
Silty and sandy with apparent orange aerobic
Minor,diffuse flow to Suck Creek near bacteria/floc/iron-oxidation.Overgrowth
Cliffside S-09* 35.217122 -81.754244 Suck Creek WS-IV NA-Seep Dispositioned NA-Seep Dispositioned accumulating.with Broad River. Flow observed In flume and on rock
face entering suck creek.
Seep was located near bank of Broad River,
from past toe drains adjacent to Unit 1-4 Rip rap on bank from new construction.Braided flow.
Cliffside S-10** 35.219472 -81.756731 Broad River WS-IV Inactive Ash Basin.Following ash basin NA-Seep Dispositioned NA-Seep Dispositioned Sandy and silty substrate with no apparent orange
excavation and toe drain removals,seep has aerobic bacteria/floc/iron-oxidation.
disappeared
Seep was located near bank of Broad River,
from past toe drains adjacent to Unit 1-4 Sandy and silty substrate with slight orange aerobic
Cliffside 5-11** 35.2194 -81.756617 Broad River WS-IV Inactive Ash Basin.Following ash basin NA-Seep Dispositioned NA-Seep Dispositioned bacteria/floc/Iron-oxidation observed on rip-rap.Flow
excavation and toe drain removals,seep has rate is a trickle with seepage from 3 or 4 locations.
disappeared _
SOC Tablas_ALL_nnal_2019_04_17 Page 1 of 4

TABLE 1
SOC LOCATIONS AND DESCRIPTIONS-2018 INSPECTION
ROGERS ENERGY COMPLEX-CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS,LLC,MOORESBORO,NC
Location Coordinates 9 Receiving -
Facility Sample ID 9 Re eivin Waterbody Description SOC MonitoringInterim Action Levels Notes from Inspection
Latitude Longitude y Classification
Diffuse seepage to area of wetness(AOW)
• with no defined channel on bank of Broad Orange aerobic bacteria/floc/iron-oxidation apparent
Cliffside S-12* 35.217658 -81.751783 Broad River WS-IV NA-Seep Dispositioned NA-Seep Dispositioned on substrate.Flow emerging from bank and flowing
River below ash storage area.AOW does not 9 9
reach surface waters. toward Broad River.
Minor flow was located at bank of Broad
River,adjacent to Unit 1-4 Inactive Ash Cliffside S-13** 35.218353 -81.754942 Broad River WS-IV Flow observed on bank entering Broad River.Flow
NA-Seep Dispositioned NA-Seep Dispositioned rate at a trickle.Orange aerobic bacteria/floc/iron-
Basin.Following ash basin excavation,seep
has disappeared. oxidation apparent on substrate.
Seepage located along toe of dike(west Some algae present.Orange aerobic
Cliffside S-14 35.214511 -81.755844 Suck Creek WS-IV side)of the active ash basin.Area of wetness Suck Creek Instream bacteria/floc/iron-oxidation was not apparent on
-no flowing water observed.Any flow would Monitoring NA-2B Standards Apply substrate.Stagnant water observed in small
move toward Suck Creek. approximately 6"x6"x0.5"pools.More wetness than
previously observed.
Second seepage area located along toe of
dike(west side)of the active ash basin.Area Suck Creek Instream
Cliffside S-15 35.214297 -81.756117 Suck Creek WS-IV of wetness- no flowing water observed.Any NA-2B Standards Apply No flow apparent.Infiltrates prior to discharge into
flow could move via poorly incised channel •
Monitoring Suck Creek.Stagnant wetness/water. '
toward Suck Creek.
Third seepage area located along toe of dike
Cliffside 5-16 35.2141 -81.756208 Suck Creek WS-IV (west side)of the active ash basin.Any Suck Creek Instream Orange aerobic bacteria/floc/iron-oxidation apparent
minor flow could move via channelized area Monitoring NA-2B Standards Apply on substrate.Rip-rap removed to improve drainage
toward Suck Creek. upstream.
Minor seep at river edge and below the Sandy and silty with apparent irn-oxidizing bacteria
Cliffside S-17** 35.217192 -81.769272 Broad River WS-IV ordinary high water level of Broad River, NA-Seep Dispositioned NA-Seep Dispositioned on the substrate.Slightly more flow than previously
•
west(upstream of S-2), observed in three separate channels entering Suck '
Creek.
Seepage from riprap at toe of inactive Unit 5 Monitoringat 5-02
• Cliffside 5-18 35.216439 -81.768564 UT to Broad River WS-IV Ash Basin.Flows north into wetland area See S-02
Orange aerobic bacteria/floc/iron-oxidation apparent
drainingto sampling site 5-2. monitoring site. on substrate.Aquatic life
p g apparent in stream.
•
Seepage from wooded area at toe of inactive Monitorin at 5-02
Cliffside 5-19 35.216361 -81.768681 UT to Broad River WS-IV Unit 5 Ash Basin.Flows north into wetland g See 5-02 Orange aerobic bacteria/floc/iron-oxidation apparent',
area draining to sampling site 5-2. monitoring site. on substrate.
Seepage from wooded area at toe of inactive Monitoring at 5-02 Cliffside S-19A 35.216581 -81.769217 Broad River WS-IV Unit 5 Ash Basin.Flows north into wetland See 5-02 Orange aerobic bacteria/floc/iron-oxidation apparent'
area draining to sampling site S-2, monitoring site. on substrate.
Stagnant AOW at toe of northeast side of Silty,clayey,and sandy substrate with rip rap.
Cliffside S-20** 35.215856 -81.765217 Broad River WS-IV Inactive Unit 5 Ash Basin.AOW dispositioned NA-Seep Dispositioned NA-Seep Dispositioned Apparent floc/iron-oxidizing bacteria on substrate
via repair. within ditches.Flow is steady.
Seep located along dike of the active ash Stagnant water that follows groin of upstream dam
Cliffside S-21 35.214625 -81.755953 Suck Creek WS-IV basin(west side).Area of wetness- no Suck Creek Instream and infiltrates prior to discharge into Suck Creek.
NA-2B St
flowing water observed.Any flow would Monitoring andards Apply Traces of orange aerobic bacteria/floc/iron-oxidation I
move toward Suck Creek. apparent on substrate.
SOC TablasALL Final_2010 04-1)
Page 2 of 0

TABLE 1
SOC LOCATIONS AND DESCRIPTIONS-2018 INSPECTION
ROGERS ENERGY COMPLEX-CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS,LLC,MOORESBORO,NC
Location Coordinates Receiving
Facility Sample ID Receiving Waterbody Description SOC Monitoring Interim Action Levels Notes from Inspection
Latitude Longitude Waterbody Classification
Cliffside S-22** 35.218278 -81.748258 WS-IV Pipe has been plugged;discharge eliminated. NA-Seep Dispositioned NA-Seep Dispositioned Pipe is plugged,no discharge.
Seep to pooled area adjacent to the Broad Orange aerobic bacteria/floc/iron-oxidation apparent
Cliffside S-23 35.217994 -81.750208 Broad River WS-IV River,located north of the active ash basin. Broad River Instream NA-2B Standards Apply on substrate.Flow that infiltrates at the top of the
Minor seepage from pool emerges with any Monitoring floodplain does not emerge as overland flow prior to
minor flow draining north to the Broad River. the bank of the Broad River.
Cliffside S-24* 35.218139 -81.749428 Broad River WS-IV Minor seepage to AOW near bank of Broad NA-Seep Dispositioned NA-Seep Dispositioned Sandy and silty substrate.Stable with low flow to the
River and north of active basin. river.
Minor seepage to AOW below ash storage Orange aerobic bacteria/floc/iron-oxidation apparent
Cliffside S-25** 35.217689 -81.751894 Broad River WS-IV area.No measurable flow has been observed NA-Seep Dispositioned NA-Seep Dispositioned on substrate.Small pool of stagant water.
throughout site history.
Cliffside S-26* 35.217425 -81.753931 Suck Creek WS-IV Natural conveyance near bank of Suck Creek NA-Seep Dispositioned NA-Seep Dispositioned Sandy and silty substrate with rock outcrops.Flow in
near confluence with the Broad River. channel entering Suck Creek.
Seep located along dike of the active ash Wet soils observed.Stagnant water in channel that
basin(west side).Area of wetness- no Suck Creek Instream infiltrates In beach sands prior to Suck Creek.Orange
Cliffside S-27 35.21383 -81.756478 Suck Creek WS-IV NA-28 Standards Apply
flowing water observed.Any flow would Monitoring aerobic bacteria/floc/iron-oxidation apparent on
move toward Suck Creek. substrate.
Minor diffuse groundwater seepage along Suck Creek Instream Flow is low and clear.Orange aerobic
Cliffside S-28 35.211677 -81.753876 Suck Creek WS-IV steep bank of Suck Creek,west of the active Monitoring NA-2B Standards Apply bacteria/floc/iron-oxidation apparent on substrate.
ash basin dike.
Minor diffuse groundwater seepage along Flow is low and clear.Orange aerobic
Cliffside S-29 35.211542 -81.753993 Suck Creek WS-IV steep bank of Suck Creek,west of the active Suck Creek Instream NA-28 Standards Apply bacteria/floc/iron-oxidation apparent on substrate.
Monitoring Vegetation covered and conceals the seep emergent
ash basin dike. area.
Minor diffuse groundwater seepage along Flow is low and clear.Orange aerobic
Cliffside S-30 35.211496 -81.75391 Suck Creek WS-IV steep bank of Suck Creek,west of the active Suck Creek Instream NA-2B Standards Apply bacteria/Floc/iron-oxidation apparent on substrate.
• ash basin dike. Monitoring Vegetation covered and conceals the seep emergent
area.
Minor diffuse groundwater seepage along Suck Creek Instream Flow is trickling/dripping and clear.Orange aerobic
Cliffside S-31 35.211482 -81.753887 Suck Creek WS-IV steep bank of Suck Creek,west of the active Monitoring NA-28 Standards Apply bacteria/floc/iron-oxidation apparent on substrate.
ash basin dike. Vegetation covered and conceals AOW.
Minor diffuse groundwater seepage along Flow is low and clear.Orange aerobic
Cliffside S-32 35.211258 -81.753646 Suck Creek WS-IV steep bank of Suck Creek,west of the active Suck Creek Instream NA-2B Standards Apply bacteria/floc/iron-oxidation apparent on substrate.
ash basin dike. Monitoring Potential new AOW identified further upstream near
powerline.Details recorded in logbook.
Seep was located at bank of Broad River, Soft sediment at bank.Abandoned outfall gone.No
Cliffside S-33** 35.218272 -81.754754 Broad River WS-IV adjacent to Unit 1-4 Inactive Ash Basin. NA-Seep Dispositioned NA-Seep Dispositioned flow.New outfall constructed for wastewater
Following ash basin excavation,seep has treatment plant.Discharge on bank a trickle.
disappeared.
Sandy and silty substrate with rock outcrops.Flow
Cliffside S-34* 35.217556 -81.753725 Suck Creek WS-IV Natural conveyance near bank of Suck Creek NA-Seep Dispositioned NA-Seep Dispositioned infiltrates prior to entering Suck Creek.No apparent
iron-oxidizlna bacteria observed. 4
soc Tabias_ALLnnai_2019_01_17 Pep 3 of 4

' TABLE 1
SOC LOCATIONS AND DESCRIPTIONS-2018 INSPECTION
ROGERS ENERGY COMPLEX-CLIFFSIDE STEAM STATION
DUKE ENERGY CAROLINAS,LLC,MOORESBORO,NC
Location Coordinates Receiving - -- — - -
Facility Sample ID Receiving WaterbodyDescription
Latitude Longitude Waterbody SOC Monitoring Interim Action Levels Notes from Inspection
Classification
Flow less than previously observed and infiltrates
Cliffside 5-35* 35.208203 -81.755703 Suck Creek WS-IV Natural conveyance near bank of Suck Creek NA-Seep Dispositioned NA-Seep Dispositioned prior to entering tributary.Sandy and silty with
minor amounts of Iron-oxidizing bacteria observed at
the confluence of the tributary.
Minor diffuse groundwater seepage along
bank of Suck Creek,west of the active ash Suck Creek Instream
Cliffside S-36 35.210258 -81.753983 Suck Creek WS-IV basin dike.New area identified with no Monitoring NA-2B Standards Apply Steady trickle flow form three drop faces.
current data.Area to be monitored to
determined status.
Seeps,,bhctovered During f201
Cliffside S-37 35.210266 -81.753827 Suck Creek WS-IV Information forthcoming In 2019 report Information forthcoming in Information forthcoming in
Information forthcoming In 2019 report 2019 report 2019 report
Cliffside 5-38 35.217759 -81.752742 Broad River WS-IV Information forthcomingIn 2019 report Information forthcoming in Information forthcoming in
p 2019 report 2019 report Information forthcoming in 2019 report
NO:::; .,.
Seepage from bank downgradlent of Active Steady flow consisten[ely within swell-defined rip
Cliffside Outfall 104(5-04) 35.217641 -81.752596 Broad River WS-IV Ash Basin to a channel flowing toward the NA-Monitored per terms of rap channel.Silty and clayey sand beneath rip rap.
the NPDES permit NA-2B Standards Apply Oran a aerobic bactera/floc/iron oxidizing bacteria
Broad River. 9
apparent on rip rap substrate along channel.
Steady stream with moderate flow volume Steady moderate flow.Water Is clear.Seepage
within well-defined channel at toe drain for NA-Monitored per terms of observed at toe of the dam at/near the rip rap pile.Cliffside Outfall 106(5-06) 35.21844 -81.748266 Broad River WS-IV Active Ash Basin dam,downstream of former the NPDES permit NA-2B Standards Apply Vegetation conceals some flow.Orange aerobic
AOW 5-22 and bacterial/floc/iron-oxidation apparent on substrate I
near the confluence with the Broad River. along channel,especially apparent in eddies.
aced by:KOf Checked by:uIC
'-Location previously investigated as a seep.Monitonng has not indicated the presence of coal combustion residuals.
"-Seep disposnloned via repair and/or non-flowing condition to potentially reach Waters of the U.S.,or other,es noted.Monitoring shall be conducted et the approximate locations indicated on the attached site map.
All monitoring shall be conducted per the requirements found In Attachment B of this Order.
pg/L-micrograms per liter
2B-15A NCAC 02L.0202 Standard
AOW-Area of Wetness
ccw-condenser circulating water
mg/L-mnograms per liter
mL/minute-milliliters per minute
NA-Not Applicable
ng/L-mnograms per liter
NPDES-National Pollutant Discharge System
S.U.-Standard Units
SOC-Special Order by Consent
IDS-Total Dissolved Solids
Ur-Unnamed Tributary
SOC Tables_ALL_Flml_2019_04_17
Page 4 of 4

2018 Annual Seep Report April 2019
Rogers Energy Complex-Cliffside Steam Station,Duke Energy Carolinas,LLC SynTerra
APPENDIX A
PHOTOGRAPHS

2018 Annual Seep Report April 2019
Rogers Energy Complex-Cliffside Steam Station,Duke Energy Carolinas,LLC SynTerra
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2018 Annual Seep Report April 2019
Rogers Energy Complex- Cliffside Steam Station,Duke Energy Carolinas,LLC SynTerra
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2018 Annual Seep Report April 2019
Rogers Energy Complex-Cliffside Steam Station,Duke Energy Carolinas,LLC SynTerra
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• 2018 Annual Seep Report April 2019
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2018 Annual Seep Report April 2019
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2018 Annual Seep Report April 2019
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2018 Annual Seep Report April 2019
Rogers Energy Complex-Cliffside Steam Station,Duke Energy Carolinas,LLC SynTerra
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2018 Annual Seep Report April 2019 .
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• 2018 Annual Seep Report April 2019
Rogers Energy Complex-Cliffside Steam Station,Duke Energy Carolinas,LLC SynTerra
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2018 Annual Seep Report April 2019
Rogers Energy Complex-Cliffside Steam Station,Duke Energy Carolinas,LLC SynTerra
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S-33 View of dispositioned seep location facing north.
0
synTerra

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• 2018 Annual Seep Report April 2019
Rogers Energy Complex-Cliffside Steam Station,Duke Energy Carolinas,LLC SynTerra
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2018 Annual Seep Report April 2019
Rogers Energy Complex-Cliffside Steam Station,Duke Energy Carolinas,LLC SynTerra
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�5-37 2019 inspection,detailed information will be provided in the 2019 report f
synTerra

' 2018 Annual Seep Report April2019
Rogers Energy Complex-Cliffside Steam Station,Duke Energy Carolinas,LLC SynTerra
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Decimal DMS
Latitude 35.217739 35°13'3" N
Longitude -81.752471 81°45'8" W
2019-04-08(Mon) 10:1 1(AM)
S-38 Seep was identified as a part of the 2019 inspection,detailed information
will be provided in the 2019 report.
ynTerra
__ 1