NC0005088_Topographic Map/Discharge Assessment Plant_20160503

Cliffside Steam Station Ash Basin
Topographic Map and
Discharge Assessment Plan
NPDES Permit NC0005088
April 29,2016
1111111 fiab DUKE
ENERGY_
RECEIVED/NCDEQ/DWR
MAY 0 3 2016
Water Quality
Permitting Section

DUKEHarry K Sidens
Senior Vice President
ENERGY, Environmental,Health&Safety
526 S Church Streer
Mail Code EC3XF
Charlotte, NC 28202
[phone]
April 28, 2016
Jeffrey O. Poupart
Water Quality Permitting Section Chief
Division of Water Resources
Department of Environmental Quality
State of North Carolina
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: March 2, 2016 Insufficiency of Discharge Assessment Plans—Duke Energy Carolinas,
LLC and Duke Energy Progress, LLC
Dear Mr. Poupart:
This responds to your letter of March 2, 2016 to Duke Energy Carolinas, LLC and Duke Energy
Progress, LLC on March 2, 2016 regarding Duke Energy's proposed Discharge Assessment
Plans.
With regard to your letter describing changes in Section 3.2.2 Observation and Sampling:
• The discussion must include a statement noting that jurisdictional determinations regarding
the extent of waters of the United States and their relationship with identified seeps at the
subject facilities will be obtained from the United States Army Corps of Engineers (USA
COE).
Duke Energy does not yet have jurisdictional determinations from the US Army Corps of
Engineers for the relevant areas at all of the twelve sites mentioned in your letter. We submitted
applications for jurisdictional determinations in September, October, and November 2015 and
have since worked with the Corps of Engineers to schedule site visits and provide draft plats for
approval. Nonetheless, the timing of the approved jurisdictional determinations is up to the
Corps and outside of Duke's control. To date, out of these twelve sites, only Buck has an
approved jurisdictional determination, but we do not yet have the signed plats.
We will submit the maps you have requested for each site on a rolling basis, within a reasonable
period after the jurisdictional determinations are complete. In order to address the changes
described in your March 2, 2016 letter, we have added the following text at the start of Section
3.2.2.
Jurisdictional determinations regarding the extent of waters of the United States and
their relationship with identified seeps at the subject facilities will be obtained from the
United States Army Corps of Engineers (USA COE). Until jurisdictional determinations
are finalized by USA COE, preliminary information will be used to evaluate the seeps as
described in the section below.
RECEIVED/NCDEQ/DWR
MAY 0 3 7016
Water Quality
Permitting Section

The second change in Section 3.2.2 described in your letter is as follows.
• The schedule for water quality sampling of the seeps and related jurisdictional waters must
be more frequent than the semi-annual basis stated in the proposed DAPs. DWR
recommends a monthly monitoring schedule, consistent with the conditions described in the
DAPs'general assessment requirements, for all identified seeps that will continue for twelve
( 12)months. After that time, monitoring may be reduced to a semi-annual basis until such
monitoring becomes a requirement of the NPDES permit.
We do not believe sampling monthly as part of a revised Discharge Assessment Plan is
warranted. For the larger receiving waters, data is available from sampling associated with
NPDES permits that demonstrates the lack of impact on the larger surface waters of the state.
In addition, we are conducting weekly observations of all AOWs on a dam or dike slope,
sampling any new seeps, and providing the analytical results to DEQ. We recommend the
sampling frequency under the DAPs remain at twice/year with the weekly inspections of dam
slopes for any new seeps with data provided to DEQ. We recommend that we collectively focus
our resources on the completion of all of the NPDES Wastewater Permits for the Duke Energy
sites and implement appropriate sampling frequency for each of the permitted seeps in that
document .
However, in order to address the changes described in your March 2, 2016 letter, we have
added the following text in Section 3.2.2.
In addition to sampling conducted with the semi-annual assessments, additional seep
sampling will be conducted at locations and at a frequency as determined through
discussions with NC DEQ personnel.
We would like to work with DEQ to achieve alignment of the various (present and future)
documents involving required seep activities including:
• Discharge Assessment Plans
• Discharge Identification Plans
• NPDES Wastewater Permits
• EPA requirements
• Any future legal agreements with either DEQ or EPA
Duke Energy is committed to providing the Department with additional information to facilitate
the issuance of new NPDES Wastewater permits. The issues are complex and require special
consideration, as illustrated by the time elapsed since the permit applications were submitted.
We look forward to working with you further to resolve the issues identified here on a mutually
acceptable schedule.
Sincerely,
9A.,,,..i),-..,...„3.
Harry Sideris
Senior Vice President
Environmental, Health and Safety

Cliffside Steam Station Ash Basin
Topographic Map and
Discharge Assessment Plan
NPDES Permit NC0005088
April 29,2016
DUKE
ENERGY
f

Duke Energy Carolinas, LLC I Discharge Assessment Plan E_DR
Cliffside Steam Station Ash Basin r
CONTENTS
Contents
Page
Contents
Figures and Tables ii
Section 1 - Introduction 1
Section 2 - Site Background 3
2.1 Plant Description 3
2.2 Ash Basin Description 3
2.3 Site Geologic/Soil Framework 4
2.4 Topographic Map and Identification of Discharges 5
2.4.1 Engineered Drainage System for Earthen Dam 5
2.4.2 Non-Engineered Seep Identification 6
Section 3 - Discharge Assessment Plan 7
3.1 Purpose of Assessment 7
3.2 Assessment Procedure 7
3.2.1 General Assessment Requirements 7
3.2.2 Observation and Sampling 8
3.2.3 Evaluation 10
3.2.4 Assessment Reporting 10
Section 4 - References 11

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FIGURES AND TABLES
Figures and Tables
Figure 1 —Site Location Map
Figure 2—Topographic Map
Table 1 —Seep and Associated Discharge Locations and Descriptions
Table 2— Laboratory Analytical Methods
Table 3—Cliffside Steam Station — Example of Surface Water/Seep Monitoring Flow and
Analysis Results Table

Duke Energy Carolinas, LLC Discharge Assessment Plan i_1?
Cliffside Steam Station Ash Basin J
SECTION 1 -INTRODUCTION
Section 1 - Introduction
The purpose of this document is to address the requirements of North Carolina General Statute
(GS)130A-309.210(a) topographic map and (b) Assessment of Discharges from Coal
Combustion Residuals Surface impoundments to the Surface Waters of the State, as modified
by North Carolina Senate Bill 729, for the Cliffside Steam Station (CSS) ash basin operated
under National Pollutant Discharge Elimination System (NPDES) Permit NC0005088.
The following requirements are contained in General Statute (GS) 130A-309.210(a):
(1) The owner of a coal combustion residuals surface impoundment shall identify all
discharges from the impoundment as provided in this subsection. The requirements for
identifying all discharges from an impoundment set out in this subsection are in addition
to any other requirements for identifying discharges applicable to the owners of coal
combustion residuals surface impoundments.
(2) No later than December 31, 2014, the owner of a coal combustion residuals surface
impoundment shall submit a topographic map that identifies the location of all (i)
outfalls from engineered channels designed or improved for the purpose of collecting
water from the toe of the impoundment and(ii) seeps and weeps discharging from the
impoundment that are not captured by engineered channels designed or improved for
the purpose of collecting water from the toe of the impoundment to the Department.
The topographic map shall comply with all of the following:
a. Be at a scale as required by the Department.
b. Specify the latitude and longitude of each toe drain outfall, seep, and weep.
c. Specify whether the discharge from each toe drain outfall, seep, and weep is
continuous or intermittent.
d. Provide an average flow measurement of the discharge from each toe drain outfall,
seep, and weep including a description of the method used to measure average flow.
e. Specify whether the discharge from each toe drain outfall, seep, and weep identified
reaches the surface waters of the State. If the discharge from a toe drain outfall,
seep, or weep reaches the surface waters of the State, the map shall specify the
latitude and longitude of where the discharge reaches the surface waters of the
State.
f. Include any other information related to the topographic map required by the
Department.
The following requirements are contained in General Statute (GS) 130A-309.210(b):
b) Assessment of Discharges from Coal Combustion Residuals Surface Impoundments to
the Surface Waters of the State. The owner of a coal combustion residuals surface
impoundment shall conduct an assessment of discharges from the coal combustion

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CRffside Steam Station Ash Basin
SECTION 1 -INTRODUCTION
residuals surface impoundment to the surface waters of the State as provided in this
subsection. The requirements for assessment of discharges from the coal combustion
residuals surface impoundment to the surface waters of the State set out in this
subsection are in addition to any other requirements for the assessment of discharges
from coal combustion residuals surface impoundments to surface waters of the State
applicable to the owners of coal combustion residuals surface impoundments.
(1) No later than December 31, 2014, the owner of a coal combustion residuals surface
impoundment shall submit a proposed Discharge Assessment Plan to the
Department. The Discharge Assessment Plan shall include information sufficient to
allow the Department to determine whether any discharge, including a discharge
from a toe drain outfall, seep, or weep, has reached the surface waters of the State
and has caused a violation of surface water quality standards. The Discharge
Assessment Plan shall include, at a minimum, all of the following:
a. Upstream and downstream sampling locations within all channels that could
potentially carry a discharge.
b. A description of the surface water quality analyses that will be performed.
c. A sampling schedule, including frequency and duration of sampling activities.
d. Reporting requirements.
e. Any other information related to the identification of new discharges required by
the Department.
(2) The Department shall approve the Discharge Assessment Plan if it determines that
the Plan complies with the requirements of this subsection and will be sufficient to
protect public health, safety, and welfare; the environment; and natural resources.
(3) No later than 30 days from the approval of the Discharge Assessment Plan, the
owner shall begin implementation of the Plan in accordance with the Plan's
schedule.
The North Carolina Senate Bill 729 establishes the submittal date of this topographic map and
Discharge Assessment Plan no later than December 31, 2014.
The topographic map, developed to satisfy the requirements of GS130A-309.210(a), was
utilized as the basis for developing the assessment procedures presented in this plan, required
by GS130A-309.210(b).
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Ciiffside Steam Station Ash Basin
SECTION 2-SITE BACKGROUND
Section 2 - Site Background
2.1 Plant Description
CSS is a coal-fired, electricity-generating facility located along the south bank of the Broad River
in Rutherford and Cleveland Counties at 573 Duke Power Road, Cliffside, North Carolina
(Figure 1). CSS currently operates Units 5 and 6 only. The original Units 1-4 were retired in
October 2011. The surrounding area generally consists of residential properties, undeveloped
land, and the Broad River.
2.2 Ash Basin Description
The station has one active ash basin and two inactive ash basins, the Units 1-4 inactive ash
basin, and the Unit 5 inactive ash basin as shown on Figure 1. The active ash basin and the
Units 1-4 inactive ash basin are located in Cleveland County to the east and southeast of the
CSS. The Unit 5 inactive ash basin is located in Rutherford County west of the CSS.
The active ash basin is located approximately 1,700 feet to the east-southeast of CSS adjacent
to the Broad River as shown on Figure 2. The active ash basin is impounded by earthen dikes
located between the west portion of the basin and Suck Creek and between the northeast
portion of the basin and the Broad River. The waste boundary associated with the active ash
basin is approximately 117 acres in area. The approximate maximum pond elevation of the
active ash basin is 770 feet. The main section of the pond is operated below 765 feet to have
extra storage capacity during a heavy flood event.
The two ash storage areas are located adjacent to the active ash basin. The ash located in
these storage areas was removed from the active ash basin. The Units 1-4 inactive ash basin is
located approximately 400 feet to the southeast of the retired Units 1-4 and approximately
1,300 feet to the northeast of Unit 6, adjacent to the Broad River(Figure 2). The Units 1-4
inactive ash basin is impounded by an earthen dike located along the north and northeast side
of the basin. The waste boundary associated with the Units 1-4 inactive ash basin is
approximately 14.5 acres in area.
The Unit 5 inactive ash basin is located approximately 1,000 feet to the southwest of Unit 5 and
approximately 1,000 feet west of Unit 6, south of the Broad River(Figure 2). The Unit 5 inactive
ash basin is impounded by two earthen dikes located along the north and northeast sides of the
basin. The waste boundary associated with the Unit 5 inactive ash basin is approximately 58
acres in area. The ash basin system has been an integral part of the station's wastewater
treatment system which has received inflows from the ash removal system, station yard drain
sump, stormwater flows, and station wastewater. Currently, the inflows from the ash removal
system and the station yard drainage basin are discharged through High Density Polyethylene
Pipe (HDPE) sluice lines into the active ash basin. The inflows are variable based on Unit 5 and
Unit 6 operations.
Effluent from the ash basin system is discharged from the active basin to the Broad River
through a concrete discharge tower located in the northeast portion of the basin. The concrete
discharge tower drains through a 42-inch reinforced concrete pipe (RCP) into a riprap-lined
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Duke Energy Carolinas, LLC I Discharge Assessment Plan 1..)1
Cliffside Steam Station Ash Basin
SECTION 2-SITE BACKGROUND
channel that discharges to the Broad River. The ash basin pond elevation is controlled by the
use of concrete stoplogs.
2.3 Site Geologic/Soil Framework
CSS is located within the Piedmont zone, one of several northeast-trending geologic belts of the
southern crystalline Appalachians. The zone lies between the Charlotte Terrane of the Carolina
zone to the east and the Blue Ridge Terrane to the west. Rocks in the Piedmont zone have
undergone intense metamorphism, folding, faulting, and igneous intrusion.
The Piedmont zone is a fault-bounded composite stack of thrust sheets containing a variety of
gneisses, schists, amphibolites, sparse ultramafic bodies, and intrusive granitoids (Horton and
McConnell, 1991; Nelson and others, 1998). The general structure within the zone is
characterized by irregular foliation of low dip and folds transverse to the northeast regional
trend. The stratified rocks consist of thinly layered mica schist and biotite gneiss that are
interlayered with lesser amounts of amphibolite, calc-silicate rocks, hornblende gneiss, and
quartzite. Protoliths of these rocks were largely sedimentary and in part volcanic. Large and
small masses of granite and granodiorite are present throughout the belt and form concordant to
semi-concordant bodies in the country rock. Some of these granitoid bodies are gneissic and
are probably older than the poorly foliated to non-foliated facies. Small, ultramafic masses are
present along the eastern and western edges of the belt. The rocks of the central core of the
Western Piedmont zone are in the sillimanite zone of amphibolite metamorphism with the flanks
primarily in the staurolite-kyanite zone (Butler, 1991).
In the Piedmont zone, a variable thickness and degree of soil, saprolite, and weathered rock,
referred to as regolith, typically overlie crystalline bedrock. The degree of weathering typically
decreases with depth with a thoroughly weathered and structureless material at the surface
termed residuum. The residuum grades into a relatively coarse-grained material that retains the
structure of the parent bedrock and is termed saprolite (can extend to greater than 150 feet in
depth below the ground surface). Beneath the saprolite, partially weathered bedrock occurs with
depth until sound bedrock is encountered.
A transition zone may occur at the base of the regolith between the soil-saprolite and the
unweathered bedrock. This transition zone of partially weathered rock is a zone of relatively
high permeability compared to the overlying soil-saprolite and the underlying bedrock (LeGrand
2004).
Groundwater flow paths in the Piedmont are almost invariably restricted to the zone underlying
the topographic slope extending from a topographic divide to an adjacent stream. LeGrand
describes this as the local slope aquifer system. Under natural conditions, the general direction
of groundwater flow can be approximated from the surface topography (LeGrand 2004).
Groundwater recharge in the Piedmont is derived entirely from infiltration of local precipitation.
Groundwater recharge occurs in areas of higher topography (i.e., hilltops)and groundwater
discharge occurs in lowland areas bordering surface water bodies, marshes, and floodplains
(LeGrand 2004).
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Duke Energy Carolinas, LLC i Discharge Assessment Plan
Cliffside Steam Station Ash Basin
SECTION 2-SITE BACKGROUND
The CSS site is located on the southern bank of the Broad River and lies in both Cleveland and
Rutherford Counties. McCraw Road runs from northwest to southeast in the vicinity of the site
and appears to generally be located along a surface water divide. The geology/groundwater
conditions at the site are expected to be generally consistent with the characteristics of the
conceptual groundwater model developed by LeGrand for the Piedmont region.
2.4 Topographic Map and Identification of Discharges
A topographic map is presented in Figure 2 to meet the requirements of GS 130A-309.210(a) in
the identification of outfalls from engineered channels, as well as seeps and weeps.
Seepage is the movement of wastewater from the ash basin through the ash basin
embankment, the embankment foundation, the embankment abutments, basin rim, through
residual material in areas adjacent to the ash basin. A seep is defined in this document as an
expression of seepage at the ground surface. A weep is understood to have the same meaning
as a seep.
Indicators of seepage include areas where water is observed on the ground surface and/or
where vegetation suggests the presence of seepage. Seepage can emerge anywhere on the
downstream face, beyond the toe, or on the downstream abutments at elevations below normal
pool. Seepage may vary in appearance from a "soft,"wet area to a flowing "spring." Seepage
may show up first as only an area where the vegetation is lusher and darker green than
surrounding vegetation. Cattails, reeds, mosses, and other marsh vegetation often become
established in a seepage area. However, in many instances, indicators of seeps do not
necessarily indicate the presence of seeps. Areas of apparent iron staining and/or excess iron
bacteria may also indicate the presence of a seep.
Locations of seepage at the ground surface adjacent to the ash basin have been identified and
are shown in Figure 2. These areas include the earthen embankments which impound the ash
basin as well as adjacent areas where water from the ash basin may have infiltrated into the
underlying residual materials and expressed as seepage.
2.4.1 Engineered Drainage System for Earthen Dam
Earth dams are subject to seepage through the embankment, foundation, and abutments.
Seepage control is necessary to prevent excessive uplift pressures, instability of the
downstream slope, piping through the embankment and/or foundation, and erosion of material
by migration into open joints in the foundation and abutments. The control of seepage is
performed by the use of engineered drains such as blanket drains, trench drains, and/or toe
drains. In certain cases, horizontal pipes may be installed into the embankment to collect and
control seepage. It is standard engineering practice to collect the seepage and convey seepage
away from the dam.
The Cliffside active ash basin downstream dam and upstream dam were constructed with a
zoned trench drain, a zoned blanket drain, and a zoned toe drain. The drainage features, or
outfalls, associated with the ash basin dam are shown as required by GS 130A-309.210(a)(2)(i)
on Figure 2.

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Ciiffside Steam Station Ash Basin
SECTION 2-SITE BACKGROUND
2.4.2 Non-Engineered Seep Identification
Topographic maps of the site were reviewed to identify regions of the site where there was a
potential for ash-basin-related seepage to be present. These regions were determined by
comparing ash basin full pond elevations to adjacent topography with ground surface elevations
lower than the ash basin full pond elevation. HDR staff performed site observations within these
identified areas as part of NPDES inspections during the reapplication process during June,
July, September, and November 2014 and documented locations where seepage was apparent
at the time of the site visit. These seeps are identified as required by GS 130A-309.210(a)(2)(ii)
on Figure 2.
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Duke Energy Carolinas, LLC j Discharge Assessment Plan
Cliffside Steam Station Ash Basin
SECTION 3-DISCHARGE ASSESSMENT PLAN
Section 3 - Discharge Assessment Plan
3.1 Purpose of Assessment
The purpose of the assessment is to determine whether existing, known discharges from toe
drain outfalls, seeps, and weeps associated with the coal combustion residuals surface
impoundment (ash basin) have reached the surface waters of the State and have caused a
violation of surface water quality standards as required by North Carolina General Statute 130A-
309.210(b).
Figure 2 and Table 1 present the background and downstream sampling locations to be
considered as part of this Discharge Assessment Plan (DAP). These locations may be
assessed by comparing surface water sampling analytical results of the associated background
location with the corresponding downstream location. For discharges located at the toe of a
dam, an upstream location within the channel may not have been possible to isolate for
comparison given the proximity to the ash basin, which would have the same chemical
composition as the discharge itself. As such, the upstream location was established upstream of
the ash basin and is considered "background." For discharges located a distance from the ash
basin, an identified upstream or"background" location for sampling may be compared to the
downstream portion of the discharge channel. The background and downstream sampling
locations are shown on Figure 2 with "B" and "D" identifiers, respectively, and the corresponding
seep locations associated with the sampling locations are indicated on Table 1.
3.2 Assessment Procedure
The assessment procedure associated with the Cliffside ash basin is provided within this
section. In addition to the specific requirements for the assessment, Section 3.2 also provides
the general requirements, the frequency of assessment, documentation requirements, and a
description of the surface water quality analyses that will be performed.
3.2.1 General Assessment Requirements
Assessments are to be performed in three phases as follows:
• Observation and Sampling (assessment site visit)
• Evaluation
• Assessment Reporting
The assessment site visit shall be performed when the background and downstream locations
are accessible and not influenced by weather events. Locations on or adjacent to the ash basin
embankments should be performed within two months after mowing, if possible. In addition, the
assessment site visit should not be performed if the following precipitation amounts have
occurred in the respective time period preceding the planned assessment site visit:
• Precipitation of 0.1 inches or greater within 72 hours or
• Precipitation of 0.5 inches or greater within 96 hours.
The assessments shall be performed under the direction of a qualified Professional Engineer or
Professional Geologist on a semi-annual basis within two nonadjacent quarters. The date of the

Duke Energy Carolinas, LLC Discnarge Assessment Pian z
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Ciiffside Steam Station Ash Basin J<
SECT,ON 3-DISCHARGE ASSESSMENT PLAN
initial assessment site visit shall be selected no later than 30 days from the approval of the
Discharge Assessment Plan and should fall within one of the semi-annual timeframes.
Additional seep locations that may have been identified and documented in an Identification of
New Discharge report(s) shall be reviewed prior to performing an assessment site visit, if
available.
3.2.2 Observation and Sampling
Jurisdictional determinations regarding the extent of waters of the United States and their
relationship with identified seeps at the subject facilities will be obtained from the United States
Army Corps of Engineers (USACE). Until jurisdictional determinations are finalized by USACE,
preliminary information will be used to evaluate the seeps as described in the section below.
The initial assessment site visit should be performed to document baseline conditions of the
discharge channel, including location, extent(i.e., dimensions of affected area), and flow of
each discharge. Discharge channel background and downstream locations should be verified
using a Global Positioning System (GPS) device. Photographs should be taken from vantage
points that can be replicated during subsequent semi-annual assessments.
Initial and subsequent assessment site visits shall document a minimum of the following to
respond to the requirements in 130A-309.210.1(b):
• Record the most recent ash basin water surface elevation and compare to the seep and
outfall and associated discharge location surface water elevations.
• For each discharge channel, the observer shall note the following as applicable on the
day of the assessment site visit:
o Is the discharge channel flowing at the time of the assessment site visit?
o Does the discharge channel visibly flow into a Water of the U.S. at the time of the
assessment site visit?
o How far away is the nearest Water of the U.S.?
o Document evidence that flow has or could reach a Water of the U.S. (e.g.,
description of flow, including extent and/or direction) and describe the observed
condition. Evidence that flow could or has reached a Water of the U.S. may be
indicated by an inspection of the adjacent and downstream topographic drainage
features.
o Observe and document the condition of the discharge channel and outfall of the
engineered channel or seep location with photographs. Photographs are to be
taken from similar direction and scale as photographs taken during the initial
assessment site visit.
• Record flow rate within the discharge channel, if measureable, using the following
methods:
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Duke Energy Carolinas, LLC D'scharge Assessment Plan �)1
Chffside Steam Station Ash Basin
SECTION 3-DISCHARGE ASSESSMENT PLAN
o Timed-volumetric method: Collect a volume of water from the discharge of the PVC
pipe directly into an appropriately sized container. Measure volumes (in mL) in the
field utilizing a graduated container. Record the amount of time (in seconds)
needed to collect the volume of water and calculate the flows (in MGD)for the
timed volume.
o A V-notch weir apparatus will be installed, if necessary, during the initial
assessment site visit to impound seepage at locations with a defined channel.
Once the impounded seep reaches equilibrium discharge, flows will be measured
using the timed-volumetric method described above.
o Area-velocity method: Measure point velocities and water depth at a minimum of 20
stations along a transect setup perpendicular to the direction of flow using a
Swoffer®3000 flow meter mounted to a standard United States Geologic Survey
(USGS)top-set wading rod. Utilize the average velocity and cross-sectional area of
the wetted channel to calculate flows in MGD.
• Collect water quality samples using the following methods:
o Collect background and downstream samples during a period with minimal
preceding rainfall to minimize potential effects of stormwater runoff. Sampling
procedures should prevent the entrainment of soils and sediment in water samples
that can result in analytical results not being representative of the flow. Because
Areas of Wetness (AOWs)/seeps often have poorly defined flow channels and
minimal channel depth, conventional grab samples collected directly into laboratory
containers or intermediate vessels is not possible without disturbance and
entrainment of soils and sediments. Further, many AOWs are contiguous with low-
lying areas subject to surface water runoff and resulting heavy sediment loading
during storm events or are near surface waters subject to flooding such that
representative samples of the AOW cannot be obtained. If the facility is unable to
obtain an AOW sample due to the dry, low flow or high flow conditions preventing
the facility from obtaining a representative sample, a "no flow" result or"excessive
flow" will be recorded.
o After collection, samples will be preserved and stored according to parameter-
specific methods and delivered to the laboratory under proper Chain-of-Custody
(COC) procedures.
o Analytical parameters for analysis include: Fluoride, Arsenic, Cadmium, Copper,
Chromium, Nickel, Lead, Selenium, and Mercury. This list includes all parameters
previously identified for seep sampling at Duke Energy power plants for which
relevant stream water quality standards are in place. (This list is responsive to the
statutory requirement for the discharge assessment to allow determination whether
discharges from toe drain outfalls, seeps, or weeps have reached surface waters
and caused a violation of surface water quality standards.)Analyses shall be
conducted by Duke Energy's Huntersville Analytical Laboratory (NC Wastewater
Certification #248) and Pace Analytical Laboratories (NC Wastewater Certification
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SECTION 3-DISCHARGE ASSESSMENT PLAN
# 12). Laboratory analytical methods used for each constituent are provided in
Table 2.
o Seep in-situ measurements: In-situ field parameters (temperature and pH) shall be
measured utilizing calibrated field meters either at the discharge of the seep
directly, at the discharge of the flow measurement devices, or in the water pool
created behind the device, if sufficient water depth did not exist at the device
discharge.
o Broad River and Ash Basin Sample Collection Method: Water quality samples and
in-situ measurements from the Broad River shall be collected at a location
upstream and downstream of the ash basin. Additionally, water samples and in-situ
measurements shall be collected from an in-process ash basin location. The grab
samples shall be collected from the river and basin's surface (0.3 m) directly into
appropriate sample bottles.
• In addition to sampling conducted with the semi-annual assessments, additional seep
sampling will be conducted at locations and at a frequency as determined through
discussions with NC DEQ personnel.
3.2.3 Evaluation
Evaluation of the data from the initial assessment site visit will establish baseline conditions and
will serve as the basis for comparison for subsequent assessment site visit results. Evaluation of
observations and sampling results shall include location, extent (i.e., dimensions of affected
area), and flow of each discharge. The analytical results of the upstream and downstream
locations shall be compared to the 15A NCAC 2B standards for surface water quality upon
receipt to identify potential exceedances.
3.2.4 Assessment Reporting
Each assessment site visit shall be documented by the individual performing the assessment,
as described in Section 3.2.2 to meet the requirements in 130A-309.210.1(b). The report should
contain site background, observation and sampling methodology, and a summary of the
observations and descriptions of the discharge channels observed, changes in observations
compared to previous assessment events, estimates of flows quantities, and photographs of
discharges and outfalls of engineered channels designed or improved for collecting water from
the impoundment. Photographs are to be numbered and captioned. The flow and analytical
results shall be recorded and presented in tables similar to the examples provided as Tables 1
and 3. The analytical results shall be compared to the 15A NCAC 2B standards for surface
water quality and exceedances highlighted. This information shall be compiled, reviewed, and
submitted to NC DEQ within 90 days from the Observation and Sampling event.

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Cliffside Steam Station Ash Basin
SECTION 4-REFERENCES
Section 4 - References
Butler, J. R. and Secor, D. T. 1991. The Central Piedmont, p. 59-78, in Horton, J. W., Jr., and
Zullo, V. A., eds., The Geology of the Carolinas: The University of Tennessee Press,
Knoxville, Tennessee, 406p.
Horton, J. W., Jr. and McConnell, K. I. 1991. The western Piedmont, p. 36-58, in Horton, J. W.,
Jr. and Zullo, V. A., eds., The Geology of the Carolinas: The University of Tennessee
Press, Knoxville, TN, 406p.
LeGrand, Harry, Sr. 2004. A Master Conceptual Model for Hydrogeological Site
Characterization in the Piedmont and Mountain Region of North Carolina, North Carolina
Department of Environment and Natural Resources.
North Carolina Department of Environment and Natural Resources. 2007. Dam Operation,
Maintenance, and Inspection Manual, North Carolina Department of Environment and
Natural Resources, Division of Land Resources, Land Quality Division, 1985 (Revised
2007).

FIGURES
AND
TABLES
1
•
,' ■�r 4r1`' i;
•

}: I:, ,:r • •_t�- 1i •
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44
/// - ,'' Scruggs : Z •(
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4v .. •••` • •
qR (` }` +., / :✓' UNITS 1-4 ,, '
n�� '.r r.- / ;.-!' INACTIVE tom- j V.
ASH BASIN "#
CLIFFSIDE st ` r,a� s :
STEAM STATION 'i. , <' 1 T� ' ' °ti+
. \ :.-
} .R1Y£RIFR08TiRD
.Z, I •
r ACTIVE
/II r ';�� ASH BASIN '
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._
/
t; �{� t. 1 . _. ,'Y-
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P' N UNIT 5
INACTIVE ' I . 1 ,
ASH BASIN1
• 1 4
ssd1 - % -c
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.. 1 if:-
ittk
4.
•
r:- N
`OTE' 4 1+, ' - - '. y
I. SOURCE. USGS TOPOGRAPHIC MAPS - CHESNEE -
QUADRANGLE (DATED 2014) AND BOILING SPRINGS SOUTH .%' •_ MC£R�fRD
QUADRANGLE (DATED 2013). I ..
O'MfGraw . : ' .
SCALE (FEET) E CM- ��
1000 0 1000 2000.,. t`' e\1
I DA-E
SITE LOCATION MAP SEPTEMBER 30. 2014
F)/
CLIFFSIDE STEAM STATION ASH BASIN
DUKE ENERGY CAROLINAS, LLC FIGURE
CLEVELAND COUNTY, NORTH CAROLINA 1
ua Suun,Gnurtn 9nmwCn"bne N.IB]0]

:..., .� r.• rR:". �• .. '�.. J - - - .. ' / b«�Lr .1.� OYd«Ml.Mo Gvinrw _•
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4
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41-
.J
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a t'fF..k Y J �r s-e 3s.z+3 a+.n3 cewa.w,.l ..4„,,,,,,,:: saw onx aD raec6
111‘31- O 'f}' - a-6 35 216
North of.Ote enonvoto s,«.
t4,:r„.. •-
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352,9 41.746
•• Q i 5a 35.21. 41.744 woad• �,ry a e03,a erose...r
i •
•i M• q ! - �- 4.
N«Ne«t alae ecl:.e 60 Nom
_�. t n •.,s ;: aa• „��' , Q � _ - _ s 7 35.2,3 a,.7a6 canlmnwe 3m.a.9,.mo tomo m erePeaY
�,'. r y'. ' A•
)4� Q� :"F'' <o o,ze roeu,uy m Suck crew
.' y_ :2,:1445114-*: �,. h ` /; " ��,u�. sa 35.2oe a,ise wrens• 5meo-.wmw,c rD
4. _ ! - •`+ ,v 1 -. aoau E«I use a sock crew.
. , ; b .' ��` �� s4 35]17 411.754 cv«uo,. „n.nwmewc .owns+.«m a map.
24
ibt•
!, >..S.r". a.' N3.✓ �" 4N w`` .,, A,s\ J):„, I•, I s-,a 35.226 a,757 cuan. ,6°°p' e°I'barkofBrowitrver , >s_z,a avm
c..3.):„,
F a "ck'"'°"' 3-D
►y bC _ ,. •.' Below n•a.e UM*to eosin
3 )../
-' - '.•-�a s,1 :u.zte 411 756 ca'«uw• o,n.o+mmw,o Wok of.road R..,
13
.•r°... N4?`.. s - w ® __ \ ,4-D ,4 BeNwaw.�...34 baron.swan
t10 3 D /� \ 6-12 35.2,7 41.752 Coolh,oue „,m=e„, two of Broad Roder 353,9 41 746
5DR 1 M W- 0D
_ .'; ry ® '��� 513 35.2�a 01.75 NO Flow rvu Along sins to ef•.
-_ s , _IV!. D. gRdpp RNER *, .�. .' s _ ` - � Ac. NPDES IO2A 1� S-6 Mw zoo N, >.D
E NPDES 0021 S-144 _ No ex.=«n basin a9a
.' ,y.... 4) '• ' EMI
_,.� r s-ts 3s.z35.3'. 411753 NO%et Nu N„,p su»;Dn5wnaae 352,6 41.75]
ITS
Egi
Floe
e �'�� S-19A - 1 5;..- :- ATkp4,� `, A, } . x. . •. .:.'�- SEE NOTE it• i 515 35.z,7 a, 3�a .ea e.� as�I awe
STEM:, None ash easel
•
5
S 1$ S17 an dee.
I. � � .. 4, ASH I -•' � • zo
/ 4kir� '�� rc - _ `S-9 STORAGEmmi‘mi �I s«oaeeIR.Ma,sweaune
• ry ® /"'�....S 9 - •w ' e .►' ,t,.,;_,
• _�' ASH ..... 3 513 3sa+s av6e w.euore EE
saepa3•r,an.om.a a,«n,oa• 35718 41767
• 35.Itfi at)53 (:on4ruwa of Unna• s..w3.I.�,zooaD m aro a.loo• 35.re ai 7as cmlm,�.r z u 5
a Jon
2 •„I f t Pa ® - s«sye ilp vu„ts
a� ' `. I - •i ) I roman
.- ro -.a '{ `` ' - '•>- 1 .�::'' f, 'S-21 - ` SM ]5.2,5 41.765 No Flow wA E^3 canape at 544th
,i M, 'ti 52,
t a 4,755 No Flow G«sem a}alnc ee,ese:n
•.,M 3q° 5-16 .'SE., aOIE .�'. cLE�asa n' D
6 \ �,- v. s - /' - yy 3� aszta 41 753
,i'•F- t - _ , r -,I .,` 1 ` 'y s-zz Egn«r«drainage downstream S - .. I : ]5]) 2 9 Cnwivara adman arm sn wrest
�1 1. ilk / CLEVE-0r9 1J
>: ~` �` ACTIVE �!
,meg � .' ` , i �( y ASH BASIN I
'a.iiRls ;�` ,� I .:”. c. LEGEND:
,r
-�'�• \ DUKE ENERGY PROPERTY BOUNDARY
*� r r ASH BASIN COMPLIANCE BOUNDARY
0'11<. •
, ,,• ---•--+I{ -�'L ASH BASIN COMPLIANCE BOUNDARY COINCIDENT
0 ft
ti 'i •• 1 � v, ” MW-22DR WITH DUKE ENERGY PROPERTY BOUNDARY
bl.
GGF�P �.'ry + z r r a i SOC ( 4 F 6�2C'i�/ \ , a ASH BASIN WASTE BOUNDARY
.44 r -���
,_•
Si z. .,,, - 1. ,,.........,,,v2.7'''-'
..r i,. + : _ �J EEN— ( ( .� ASH STORAGE AREA BOUNDARY
%` d,/ ♦ \- z .3+ • '/ "ti \ `( ASH BASIN COMPLIANCE GROUNDWATER
• ,•,,• ':. ` ."11.4 V.' .5 ,• ti 51g, _ sz' rJ '+Gto°��'Iiga'...• 1`� • S-8 \, • y MONITORING WELL
'' - , rpitagb - ——— — - LANDFILL LIMIT OF WASTE
,{( ',./• ��� + _. ��,u.�S ,f i' > Fiji... } aY. , \ •
— — STREAM
a. - ` r r. 4;� �/ .�
d` / t {+ f ; s..,-.,?.
� a' TOPOGRAPHIC CONTOUR(4 FOOT)
31451.' l I ,,,f 7 r I K SNS.. ' MW-24D
DEQ •
w .PERMIT#81:06 r: A{ - , ",ems MW-24DR ti I S- SEEP SAMPLE LOCATION
• Jfi41°
•
.. �' �' - , ® 4`54. '" ' • O� NPDES 002 4c. NPDES OUTFALL LOCATION
)` om. - Y "
-_ '"I 4 ,}r;'_ _ - 4 c'•C`Z' WATER QUALITY SAMPLE LOCATION
•
, /T DISCHARGE SAMPLING LOCATIONS
.,m •
GY p,VL i I / QF...
r �,._ 'J - -- - . . CC,R '"t' 3y BACKGROUND SAMPLING LOCATIONS
�'•S, . ,- k0 •. i
NOTES:
1.PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE. SCALE (FEET)
2.ASH BASIN WASTE BOUNDARY,CCP LANDFILL BOUNDARY,AND ASH STORAGE AREA BOUNDARIES ARE APPROXIMATE. TOPOGRAPHIC MAP WITH IDENTIFIED DATE
3.AS-BUILT MONITORING WELL LOCATIONS PROVIDED BY DUKE ENERGY. 300' 0 300' 6SC
4.ORTHOPHOTOGRAPHY WAS OBTAINED FROM NC ONEMAP GIS WEB SITE(DATED 2010). l'-600' SEEPS AND OUTFALDECEMBER, 2014
5.TOPOGRAPHIC CONTOURS WERE OBTAINED FROM NCDOT WEB SITE(DATED 2010)AND ARE APPROXIMATE. FyZ DUKE ENERGY CAROLLSINAS, LLC
6.THE ASH BASIN COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a).
7.HYDROGRAPHY WAS OBTAINED FROM THE USGS NATIONAL MAP VIEWER AND DOWNLOAD PLATFORM ON MARCH 26,2014(http://nationalmap.gov/viewer.html) CLI FFSIDE STEAM STATION ASH BASIN FIGURE
8.SEEP SAMPLING LOCATIONS ARE APPROXIMATE. NPDES PERMIT #NC0005088 2
9.NPDES OUTFALL AND WATER QUALITY SAMPLE LOCATIONS PROVIDED BY DUKE ENERGY.
10.SEE REPORT"CLIFFSIDE STEAM STATION ASH BASIN SURFACE WATER AND SEEP MONITORING-OCTOBER 2014,APPENDIX C"FOR DESCRIPTION OF DAM DRAINAGE SYSTEM. CLEVELAND COUNTY, NORTH CAROLINA

Table 1-Cliffside Steam Station Ash Basin-Seep and Associated Discharge Locations and Descriptions
Location Flow Discharge Location Coordinates
Seep f Coordinates Flow Measurement Background (NAD 83)
Discharge (NAD 83) Description (MGD)and Location Discharge Location and Discharge Sampling Location
ID
Latitude Longitude Method Latitude Longitude
0.0646 Northwest of the Inactive Unit 5 ash basin;tributary of
S-1 35.216 -81.775 Continuous area-velocity 1-D River 35.218 81.775
1-D
0.2004 Downriver from Inactive Unit 5 ash basin discharge
S-2 35.217 -81.768 Continuous area-velocity canal 35.218 81.767
2-D
S-3 35.220 -81.758 Continuous 0.0582 At discharge canal for Units 1-4;tributary of Broad River 35.218 -81.753
area-velocity 3-13
0.0129 North of the ash storage area;below outfall of concrete
S-4 35.218 -81.753 Continuous ditch
area-velocity
4-0
0.0014 North of the ash storage area;below outfall of concrete
S-5 35.218 -81.750 Continuous timed-volumetric ditch
4-D
35.219 -81.746
0.0323 Downgradient of the active ash basin dike;tributary of
S-6 35.218 -81.748 Continuous area-velocity Broad River
4-D
0.0078 Northeast of the active ash basin;northeast corner of
S-7 35.218 -81.746 Continuous timed-volumetric 1-B p�rtY
4-0
SB 35.208 81.756 Continuous X0.0129 Tributary to Suck Creek
timed-volumetric 3-D
S-9 35.217 -81.754 Continuous 0.0013 East side of Suck Creek;downstream of bridge
timed-volumetric 3-D
35.218 -81.753
S-10 35.220 81.757 Continuous 0.0004 Below inactive Units 1-4 south bank of Broad River
timed-volumetric 3-D
5-11 35.219 -81.756 Continuous 0.0025 Below inactive Units 1-4 south bank of Broad River
timed-volumetric 3-0
S-12 35.217 -81.752 Continuous 0.0003 Below ash storage basin;south bank of Broad River 35.219 -81.746
timed-volumetric 4-D
S-13 35.218 -81.75 No Flow N/A Along Units 14 dike
3-0
S-14 35.214 -81.756 No Flow N/A Along active ash basin dike 35.218 -81.753
-0
S-15 35.214 -81.756 No Flow N/A Along active ash basin dike
3-D

Location Flow Discharge Location Coordinates
Seep! Coordinates Flow Measurement Background (NAD 83)
Discharge (NAD 83) Description (MGD)and Location Discharge Location and Discharge Sampling Location
ID —
Latitude Longitude Method Latitude Longitude
S-16 35.214 -81.756 No Flow NAlong active ash basin dike
/A
3-D
S-17 35.217 -81.769 Continuous 0.0017 Along active ash basin dike;seepage from Unit 5
timed-volumetric 2-D
S-18 35.216 -81.768 Continuous 0.0048 Seepage from riprap at toe of Unit 5
timed-volumetric 2-0
S-19 35.216 81.768 Continuous 0.0009 Seepage from wooded area at toe of Unit 5 35.218 -81.767
timed-volumetric 2-D
S19a 35.216 81.769 Continuous 0.0005 Seepage from wooded area at toe of Unit 5
timed-volumetric 2-D
S-20 35.215 -81.765 No Flow N/A Seepage at toe of Unit 5
2-D
S-21 Engineered drainage at Suck Creek dam at active ash
CLEVE-050 35.214 -81.755 No Flow basin
3-1, 35.218 -81.753
S-22 35.217 -81.749 Continuous Engineered drainage downstream dam at active ash basin
CLEVE-0493-D
Notes:
1. Flow description for each seep sample location is based on observation during site visits performed by HDR in June and July 2014
2. Flow measurements and analytical samples were collected on July 7,9,and 22,2014;and November 10,2014
3. Location coordinates for seep sampling locations are approximate
4. Location coordinates(degrees)in NAD 83 datum

Table 2—Laboratory Analytical Methods
Reporting
Parameter Method Limit Units Laboratory
Fluoride(F) EPA 300.0 1 mg/I Duke Energy
Mercury(Hg) EPA 245.1 0.05 pg/I Duke Energy
Arsenic(As) EPA 200.8 1 pg/I Duke Energy
Cadmium(Cd) EPA 200.8 1 Ng/I Duke Energy
Chromium(Cr) EPA 200.8 1 pg/I Duke Energy
Copper(Cu) EPA 200.8 1 pg/I Duke Energy
Lead(Pb) EPA 200.8 1 pg/I Duke Energy
Nickel (Ni) EPA 200.8 1 pg/I Duke Energy
Selenium (Se) EPA 200.8 1 pg/I Duke Energy

Table 3-Cliffside Steam Station-Example of Surface Water/Seep Monitoring Flow and Analysis Results Table
Parameters Units S-1 S-2 S-3 S-4 S-5 S-6 S-7 S-8 S-9 S-10 S-11 S-12 5-17
Fluoride mg/I < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1
Hg-Mercury(71900) pg/I < 0.05 < 0.05 < 0.05 < 0.05 _< 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05
As-Arsenic(01002) pg/I < 1 < 1 5.51 28.6 < 1 < 1 < 1 < 1 < 1 334 104 + < 1 < 1
Cd-Cadmium(01027) pg/I < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1
Cr-Chromium(01034) pg/I < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1
Cu-Copper(01042) pg/I < 1 < 1 1.24 < 1 < 1 < 1 _< 1 < 1 < 1 < 1 < 1 < 1 < 1
Pb-Lead(01051) pg/I < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1
Ni-Nickel(01067) pg/I < 1 9.01 59.3 < 1 < 1r 1.82 < 1 < 1 1.45 < 1 10.4 < 1 < 1
Se-Selenium(01147) pg/I < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 1 1.64
_ r
pH s.u. 6.7 7 5.8 7 5.6 6.5 6.2 6.4 5.9 6.7 6.6 6.5 5.15
Temperature °F 68.2 74 75.5 64.9 61.3 62.3 67.7 66.0 62.4 74.4 73.6 15.8 16.7
Flow MGD 0.0646 0.2004 0.0582 0.0129 0.0014 0.0323 I 0.0078 < 0.0129 0.0013 0.0004 0.0025 0.0003 0.0017
Ash Broad River Broad River
Parameters Units S-18 S-19 S-19a Basin in Upstream Downstream
Process
Fluoride mg/I < 1 < 1 < 0.1 < 1 < 1 < 1
Hg-Mercury(71900) pg/I < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05
As-Arsenic(01002) pg/I < 1 < 1 < 1 < 51.9 < 1 < 1
Cd-Cadmium(01027) pg/I < 1 < 1 < 1 < 1 < 1 < 1
Cr-Chromium(01034) pg/I < 1 < 1 < 1 < 15 < 1 < 1
Cu-Copper(01042) pg/I < 1 < 1 < 1 < 1.6 < 1 < 1
Pb-Lead(01051) pg/I < 1 < 1 < 1 < 1 < 1 < 1
Ni-Nickel(01067) pg/I 24.3 < 1 8.94 1.24 < 1 < 1
Se-Selenium(01147) pg/I < 1 < 1 < 1 < 32.5 < 1 < 1
pH s.u. 6.3 6.4 6.8 10 7.3 7.9
Temperature °F 17.7 13.3 15.8 87.1 79 79.7
Flow MGD 0.0046 0.0009 0.0005 537 < 537
Notes:
1. Flow measurements and analytical samples for were collected on July 7, 9, and 22, 2014; October 22, 2014; November 10, 2014
2. Flow at locations upstream and downstream of CSS in the Broad River is from the USGS Broad River-Boiling Springs daily average flows for the date of river sampling