NC0003417_Topo Map and Discharge Assessment Plan_20160503

H.F. Lee Energy Complex Ash Basins
Topographic Map and
Discharge Assessment Plan
NPDES Permit NC0003417
April 29,2016
talkS DUKE
ENERGY_.
RECEIVED/NCDEQ/DWR
FYZ
MAY 0 3 2016
Water Quality
Permitting Section

nt
4444, DUKE Harry K. Sidens
ENERGY, ental. ealtPreSafety
Environmental,Health&Safety
526 S Church Street
Mail Code EC3XP
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.
RECENED/NCDEQ/DWR
MAY 0 3 2016
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,
9,4.„„,.j..2);...&:...3
Harry Sideris
Senior Vice President
Environmental, Health and Safety

H.F. Lee Energy Complex Ash Basins
Topographic Map and
Discharge Assessment Plan
NPDES Permit NC0003417
April 29,2016
tr.
iiiirami) DUKE
ENERGY

Duke Energy Progress,LLC I Discharge Assessment Plan ���
H.F.Lee Energy Complex Ash Basins
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 3
2.4 Topographic Map and Identification of Discharges 4
2.4.1 Engineered Drainage System for Earthen Dam 4
2.4.2 Non-Engineered Seep Identification 5
Section 3- Discharge Assessment Plan 6
3.1 Purpose of Assessment 6
3.2 Assessment Procedure 6
3.2.1 General Assessment Requirements 6
3.2.2 Observation and Sampling 7
3.2.3 Evaluation 9
3.2.4 Assessment Reporting 9
Section 4 - References 10

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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— HF Lee Energy Complex Ash Basins—Example of Surface Water/Seep Monitoring
Flow and Analysis Results Table

Duke Energy Progress, LLC Discharge Assessment Plan
H.F.Lee Energy Complex Ash Basins
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 H.F. Lee Energy Complex (Lee Plant) ash basins
operated under National Pollutant Discharge Elimination System (NPDES) Permit NC0003417.
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

Duke Energy Progress,LLC 1 Discharge Assessment Plan I ��
H.F Lee Energy Complex Ash Basins J
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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SECTION 2-SITE BACKGROUND
Section 2 - Site Background
2.1 Plant Description
The Lee Plant was a coal-fired electricity-generating facility located west of Goldsboro in Wayne
County, North Carolina (Figure 1). The project began commercial operation in 1951. Additional
coal units were added in the late 1950s and early 1960s, and four oil-fueled combustion turbine
units in the late 1960s and early 1970s. The three coal-fired units were retired in September
2012 followed by four oil-fueled combustion turbine units in October 2012. In December 2012,
the H.F. Lee Combined Cycle Plant was brought on-line. The combined cycle plant applies two
sources of energy, combustion and steam turbines, to convert natural gas to electricity.
The property encompasses approximately 2,100 acres, including the ash basins, a cooling pond
(located to the east of the plant operations area), and the Neuse River.
2.2 Ash Basin Description
Ash generated from coal combustion was conveyed to the ash basins, which include the
inactive and active basins. Combined, the active and inactive ash basins encompass
approximately 314 acres (171 acres for the inactive ash basins and 143 acres for the active ash
basin). The inactive ash basins were built as three cells in approximately the late 1950s and
early 1960s. The active ash basin was constructed in the late 1970s. Sluicing fly ash and bottom
ash at the active basin was discontinued in late 2012 to early 2013 as the Lee Plant ended
production of coal combustion residuals. The active basin discharges treated wastewater to the
Neuse River through an NPDES permitted outfall.
2.3 Site Geologic/Soil Framework
The Lee Plant lies within the Coastal Plain Physiographic Province which is approximately 90 to
150 miles wide, extending from the Atlantic Ocean westward to its boundary with the Piedmont
province. Of the two natural subdivisions of the Coastal Plain, the Lee Plant is located on the
Inner Coastal Plain consisting of gently rolling land between the Tidewater region and the Fall
Line.
The site consists of surficial sand of post Miocene age, which is typically less than 40 feet thick.
Underlying the surficial sand is the Yorktown and Duplin Formation (undifferentiated)of late
Miocene age. The Yorktown Formation is a fossiliferous clay with varying amounts of fine-
grained sand, bluish gray, and shell material commonly concentrated in lenses; mainly in areas
north of Neuse River. The Duplin Formation consists of shelly, medium-to coarse-grained sand,
sandy marl, and limestone, bluish gray; mainly in areas south of Neuse River. The thickness of
this unit varies, but, based on previous site work, is typically less than 60 feet thick in the vicinity
of the Lee Plant. Below the Yorktown/Duplin Formations is the Cape Fear Formation. The
lithology and the thickness of this unit varies regionally but has been described as a yellow
conglomeritic marl containing abundant phosphate and quartz pebbles, sharks teeth, and fish
vertebrae (North Carolina Geological Survey, 1985).
3

Duke Energy Progress,LLC]Discharge Assessment Plan
H F Lee Energy Complex Ash Basins
SECTION 2-SITE BACKGROUND
Surface topography at the Lee Plant slopes downward toward the Neuse River and groundwater
flows the same direction. Vertical groundwater flow is anticipated to be limited by a local clay
confining layer within the Yorktown Formation at an elevation of approximately 30 feet mean
sea level.
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 (NCDENR, 2007). 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 active ash basin dam includes an NPDES permitted outfall. 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.
4

Duke Energy Progress,ress,LLC Discharge Assessment Plan
9 L��
H.F. Lee Energy Complex Ash Basins r
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. Synterra staff performed site observations within
these identified areas as part of NPDES inspections during the reapplication process during
August and October 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.
5

Duke Energy Progress,LLC I Discharge Assessment Plan
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H.F. Lee Energy Complex Ash Basins
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 Lee Plant ash basins 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, and
• 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
6

Duke Energy Progress,LLC Discharge Assessment Plan �)�
H.F Lee Energy Complex Ash Basins
SECTION 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 reports) 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:
7

Duke Energy Progress, LLC'Discharge Assessment Plan EN
H F Lee Energy Complex Ash Basins J
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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Duke Energy Progress,LLC I Discharge Assessment Plan FN
H . Lee Energy Complex Ash Basins
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 Neuse River and Ash Basin Sample Collection Method: Water quality samples and
in-situ measurements from the Neuse River shall be collected at a location
upstream and downstream of the ash basins. 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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Duke Energy Progress, LLC I Discharge Assessment Plan �11
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SECTION 4-REFERENCES
Section 4 - References
North Carolina Geological Survey, 1985, Geologic map of North Carolina: North Carolina
Geological Survey, General Geologic Map, scale 1:500000.
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).
70

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SOURCES: DATE ''A",. 3s.„niE, , . .... a s.h,2!' .11 0771,1
1. 2012 AERIAL PHOTOGRAFH OBTAINED FROM THE NRCSGEOSPATIAL DATA GATEWAY AT TOPOGRAPHIC MAP WITH IDENTIFIED 951 x117 x •7,loam, Is�:w� .n: „04x0� , ",,,
http:-;datagateway.nres.usda-gov SEEPS AND OUTFALLS DECEMBER, 2014 "�' ��° °'°°°
«n�
2B
2. 2014 AERIAL PHOTOGRAPH WAS OBTAINED FROM WSP FLOWN ON APRIL 17.2014. '""a ”" ���
DUKE ENERGY CAROLINAS. LLC w°. ", -vaBK � ° ni
FIGURE
3. PARCEL BOUNDARY WAS OBTAINED FROM WAYNE COUNTY GIS DATA AT H.F.1..)11 LEE ENERGY COMPLEX %'";a.W, 470!.0 snaOwW.a x,1 ae Nome 'dl Js.r. 7 °.'0045
http: www.way negov.con/page'214 2 r°,n., ss"""
NPDES PERMIT #NC0003417 5,1J.�., • ,, 0—,.,----, NM an. e� 1
4. DRAWING HAS BEEN SET'KITH A PROJECTION OF NORTH CAROLINA STATE PLANE "'7'•-"•' •.044" 51i'w"" !Nun
�' 'M' L JP ss°
COORDINATE SYSTEM FIN 320C(NAD 83). GOLDSBORO, NORTH CAROLINA

Table 1-I-IF Lee Energy Complex Ash Basin-Seep and Associated Discharge Locations and Descriptions
Location Coordinates Flow Discharge Location
Seep/Discharge ID
(11/0 ID) Flow Measurement Background Discharge Location and Discharge Co rdinattes
Description (MGD)and Location Sampling Location
Latitude Longitude Method Latitude Longitude
S-01(Active Ash North of active ash basin at toe of dike;flows
Basin) 35.386858 -78.073453 Intermittent NF west
2-D
35.383042 -78.084203
S-02(Active Ash 0.16189 North of active ash basin at toe of dike;flows
Basin) 35.384001 -78.081383 Continuous area-velocity west
2-0
S-03(Active Ash 0.71175 West side of active ash basin;flows
Basin) 35.382666 -76.084374 Continuous area-velocity underneath road
3-0
S-03A(Active Ash Downgradient of S-X at confluence of Neuse
Basin) 35.381806 -78.084052 Intermittent N/A River
3-0
35.381667 -78.084364
S-04(Active Ash 35.381993 78.078784 Intermittent NF Stagnant pond inland from river terrace
Basin) 3-0
S-05(Active Ash 2-8 Riprap area on southeast corner of active
Basin) 35.379045 -78.070293 Intermittent NS ash basin
3-D
East of active ash basin at toe of dike;flows
S-06(Active Ash 35.386968 -78.071942 Continuous NF
Basin) south
1-D
S-07(Active Ash 0.17235 East of active ash basin at toe of dike;flows
Basin) 35.382767 -78.069655 Continuous area-velocity south
1-0
S-O8(Active Ash Riprap area east side of southeast corner of 35.379183 -78.067533
Basin) 35.380510 -76.068532 Intermittent NS active ash basin
1-D
S-09(Active Ash 0.03708 East side of ash basin at toe of dike;flows
Basin) 35.379492 -78.067718 Continuous area-velocity from S-06,-07
1-0
S-18(BasinsInactive Ash 35.379222 -78.101206 Ponded Water NM Pond inland from river terrace
35.377061 -78.101858
S-19(Inactive Ash 35.381790 -78.097649 Ponded Water NM Pond inland from river terrace
6-D

Location Coordinates Flow Discharge Location
w'th Flow Measurement Background Discharge Location and Discharge Coordinates
Description (MGD)and Location Sampling Location MAD sal
Seap!Discharge ID
Latitude Longitude Method Latitude Longitude
Basins)
S-20(Active Ash 0.00038 Near well CMW-10 along south side of active
Basins) 35.382406 -78.082051 Continuous timed-volumetric ash basin
3-0
S-21(Active Ash 35.382151 -78.080376 Intermittent NF Along south side of active ash basin
Basin) 3-0
' S-22(Active Ash 35.381466 -78.077819 Continuous 0.00059 Along south side of active ash basin
Basin) timed-volumetric 3-0
S-23(Active Ash 0.00647 Along south side of active ash basin in Neuse
Basin) 35.381175 -78.077136 Continuous timed-volumetric floodplain
3-D 35.382117 -78.083525
S-24(Active Ash 0.02040 Along south side of active ash basin in Neuse
Basin) 35.381063 -78.076431 Continuous timed-volumetric floodplain
2-B 3-D
S-25(Active Ash 35.380922 -78.076001 Continuous 0.00024 Along south side of active ash basin
Basin) timed-volumetric 3-D
S-26(Active Ash 0.00284 Within the Neuse River bank downgradient of
Basin) 35.381640 -78.078322 Continuous timed-volumetric the south side of the active ash basin
3-D
S-10(Active Ash 35.381097 -78.088737 Upstream NM Neuse River upstream from active ash basin 35.381281 -78.089667
Basin) Surface Water 4-D
S-11(Active Ash Downstream Neuse River downstream from active ash
35.379131 -78.067421 NM basin 35.379183 -78.067533
Basin) Surface Water
1-0
S-12(Active Ash 35.380910 -78.08974 Upstream NM Bypass canal upstream of plant 35.381281 -78.089667
Basin) Surface Water 4-D
S-13(Active Ash 35.360761 78.077669 Downstream NM 1-B Neuse River downstream of bypass 35.361225 -78.077814
Basin) Surface Water 8-D
S-14(Inactive Ash Upstream 0.22587 Halfmfle Branch upstream of inactive ash
Basins) 35.383346 -78.108965 Surface Water area-velocity 3-8
35.380567 78.108944
3-B 5-0
S-15(Inactive Ash 35.377430 -76.104218 Downstream 1.10706 l-talfmile Branch downstream of inactive ash 35.377061 -78.101858
Basins) Surface Water area-velocity basin

Location Coordinates Flow Discharge Location
Seep/Discharge ID MAD ID) Flow Measurement Background Discharge Location and Discharge COordintes
(NAD 8a
Description (MGD)and Location Sampling Location
Latitude Longitude Method Latitude Longitude
6-0
S-16(Inactive Ash 35.372416 -78.102819 Upstream NM Neuse River upstream of inactive ash basin 35.372947 -78.102575
Basins) Surface Water 7-D
4-B
5-17(Inactive Ash DownstreamNeuse River downstream of inactive ash
Basins) 35.382494 -78.09514 Surface Water NM basin 35.377061 -78.101858
6-D
Notes.
Flow description for each seep sample location Is based on observation during site 015,15 performed by Syntena August 2014
1

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

Table 3-HF Lee Energy Complex Ash Basin-Example of Surface Water/Seep Monitoring Flow and Analysis Results Table
Parameter Units S-01 S-02 S-03 S-04 S-06 5-07 S-09 S-10 S-11 S-2 S-13 S-14 S-15 S-16 5-17 S-20 S-21 S-22 S-23 S-24 S-25 S-26
Fluoride mgll < 0.1 0.32 0.30 0.54 0.10 0.37 0.51 0.13 0.13 0.13 0.13 010 0.11 0.13 0.13 0.16 0.11 0.51 0.64 0.48 0.58 0.72
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 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05
As-Arsenic(01002) pg/1 2.56 126 89.6 1470 1.33 90.7 91.6 < 1 1.43 < 1 < 1 < 1 2.43 < 1 < 1 3.03 2.54 3.86 129 330 145 769
Cd-Cadmium(01027) pg/I < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1
Cr-Chromium(01034) pg/I 1.21 < 1 < 1 < 1 1.36 < 1 < 1 1.97 1.89 1.85 2.02 < 1 1.55 2.27 2.24 1.32 1.19 < 1 < 1 < 1 1.41 2.82
Cu-Copper(01042) pg/I 1.09 < 1 < 1 1.25 1.35 < 1 < 1 3.10 2.62 2.78 2.88 < 1 1.92 3.14 3.20 3.60 3.70 < 1 < 1 < 1 1.13 2.65
Pb-Lead(01051) pgll 1.31 < 1 < 1 < 1 1.8 < 1 < 1 2.32 2.00 2.22 2.04 < 1 1.27 2.45 2.36 1.98 1.17 < 1 < 1 < 1 1.75 4.68
Ni-Nickel(01067) pg/I < 1 < 1 < 1 < 1 1.57 1.26 1.27 1.52 1.59 1.46 1.47 < 1 1.47 1.86 1.57 3.92 3.37 < 1 < 1 < 1 1.03 1.91
Se-Selenium(01147) pg/I < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1
pH s.u. 5.9 6.6 7.1 7.2 6.1 7.0 7.5 6.6 6.5 6.7 6.6 6.0 5.8 6.7 6.5 7.3 5.8 6.9 7.1 6.6 7.5 7.23
Temp. °C 23 23 26 28 24 22 22 26 26 26 25 26 24 26 26 26 25 24 20 19 22 18.8
Flow MGD NF 0.0162 0.7118 NF NF 0.1724 0.0371 NM NM NM NM 0.2259 1.1071 NM NM 0.0004 NF 0.0006 0.0065 0.0204 0.0002 0.0028
Notes:
1. Samples collected August 2014 by Synterra.