HomeMy WebLinkAboutNC0003433_Topo Map and Discharge Assessment Plan_20141230
Cape Fear Steam Electric Plant Ash Basin
Topographic Map and
Discharge Assessment Plan
NPDES Permit NC0003433
December 30, 2014
Duke Energy Progress, LLC | Discharge Assessment Plan
Cape Fear Steam Electric Plant Ash Basin
TABLE OF CONTENTS
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Table of Contents
Page
Table of Contents ......................................................................................................................... i
List of 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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Cape Fear Steam Electric Plant Ash Basin
LIST OF FIGURES AND TABLES
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List of 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 – Example of Surface Water/Seep Monitoring Flow and Analytical Results Table
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SECTION 1 - INTRODUCTION
1
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 Cape Fear Steam Electric Plant (Cape Fear Plant)
ash basin operated under National Pollutant Discharge Elimination System (NPDES) Permit
NC0003433.
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):
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SECTION 1 - INTRODUCTION
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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
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
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Section 2 - Site Background
2.1 Plant Description
The Cape Fear Steam Electric Plant (Cape Fear Plant) is located on approximately 900 acres in
central North Carolina near Moncure, in Chatham County. The site is along the east bank of the
Cape Fear River, southeast of Moncure and west of Corinth Road. Cape Fear Plant operations
began in 1923 with additional units added from 1924 to 1969. In the most recent configuration,
the Cape Fear Plant employed two coal-fired units along with four oil-fueled combustion turbine
units. Ash generated from coal combustion was stored on-site in ash basins. Operations were
terminated at the Cape Fear Plant in October 2012 and demolition activities are currently
underway.
2.2 Ash Basin Description
Five ash basins have historically been used at the Cape Fear Plant and are referenced using
the date of construction: 1956, 1963, 1970, 1978, and 1985. The 1956 ash basin is located
north of the former Cape Fear Plant, and the remaining ash basins are located south of the
Cape Fear Plant area. The 1963 and 1970 ash basins were constructed on the west side of the
Cape Fear Plant property, adjacent to the Cape Fear River. The 1978 ash basin was
constructed east of and abutting the 1963 and 1970 as basins. The 1985 ash basin was
constructed east of the existing ash basins between the discharge canal and Corinth Road. The
ash basins are impounded by earthen dams. A 500-foot compliance boundary encircles the ash
basins.
Currently, the 1956, 1963, and 1970 ash basins are dry and entirely covered with vegetation
(hardwood and pine trees). A small area near the southern end of the 1970 ash basin is
seasonally wet. The 1978 ash basin is partially vegetation-covered (trees and scrub), and a
portion of the southern end of the ash basin retains water. The 1985 ash basin has some grass
cover and ponded water in its southwest corner.
All wastewater, formerly generated by the site, historically discharged to the effluent channel
prior to the combined outfall. The combined outfall now contains all waste stream flows and is
located in the effluent channel. Downstream of the effluent channel, the manmade canal
becomes an unnamed tributary of the Cape Fear River.
2.3 Site Geologic/Soil Framework
The Cape Fear Plant is within the Deep River Basin; an irregular, half-graben structural feature
of Triassic age. In the area of the Cape Fear Plant, the basin is surrounded by and presumably
underlain by igneous and metamorphic rocks of the Carolina Terrane rocks. Continental
sediments overlying the basin are cut by numerous diabase dikes. The stratigraphy of the basin
is represented by a lower sequence of coarse-grained arkosic sandstone and conglomerate; a
middle sequence of siltstone, shale, and thin coal deposits; and an upper sequence of
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SECTION 2 - SITE BACKGROUND
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sandstone, mudstone, siltstone, and conglomerate. The strata of the deep River Basin generally
dip gently to the east (Horton and Zullo, 1991).
The Cape Fear Plant was constructed on 15 to 30 feet of residuum of the sedimentary rocks
underlying the site, determined as brown to gray mudstones and siltstones from boring logs.
Groundwater exists in the residuum and within joints and fractures of the underlying bedrock.
The water table generally follows topography, with the predominant groundwater flow direction
toward the west and west-southwest at a depth of about 10 to 20 feet.
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.
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SECTION 2 - SITE BACKGROUND
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A number of internal outfalls drain to a canal where flow is directed to the Combined
Wastewater Outfall. The engineered drainage system features, or outfalls, associated with the
ash basin dam are shown as required by GS 130A-309.210(a)(2)(i) on Figure 2.
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
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.
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SECTION 3 - DISCHARGE ASSESSMENT PLAN
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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 Cape Fear 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
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SECTION 3 - DISCHARGE ASSESSMENT PLAN
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• 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
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
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 W ater 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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SECTION 3 - DISCHARGE ASSESSMENT PLAN
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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. Collect
samples from the discharge channel at the flow measurement devices or directly
from the discharge into sample bottles while minimizing disturbance and
entrainment of soil/sediment. 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
# 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.
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SECTION 3 - DISCHARGE ASSESSMENT PLAN
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o Cape Fear River and Ash Basins Sample Collection Method: Water quality samples
and in-situ measurements from the Dan 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.
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 NCDENR within 90 days from the Observation and Sampling event.
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SECTION 4 - REFERENCES
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Section 4 - References
Horton, J. W. and Zullo, V. A. 1991. The Geology of the Carolinas, Carolina Geological Society
Fiftieth Anniversary Volume, 406 pp.
NCDENR. 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
Table 1 –Cape Fear Electric Steam Station Ash Basin –Seep and Associated Discharge Locations and Descriptions Seep / Discharge ID Location Coordinates (NAD 83) Flow Description Flow Measurement (MGD) and Method Background Location Discharge Location and Discharge Sampling Location Discharge Location Coordinates (NAD 83) Latitude Longitude Latitude Longitude S-01 35.594102 -79.045478 Intermittent N/A 1-B Northeast of Duke personnel trailer 1-D 35.595078 -79.0456 S-02 35.593275 -79.044527 Intermittent N/A Northwest corner of 1985 ash pond 1-D S-03 35.592505 -79.045727 Intermittent N/A Grassy area between 1985 ash pond and CP&L drive 2-D 35.568678 -79.045808 S-04 (CF-85N) 35.593009 -79.042762 Continuous NF North side of 1985 ash pond 2-D S-05 (CF-J) 35.590292 -79.046627 Continuous 0.00102 timed-volumetric West of cooling tower structure and north of 1978 pond 2-D S-06 35.589811 -79.045365 Intermittent N/A Western bank of canal by 1978 ash pond 2-D S-07 (CF-D) 35.58993 -79.043569 Continuous NF Upstream of NPDES Outfall 007 2-D S-08 (CF-85SW-CANAL) 35.585847 -79.04267 Continuous 0.00323 area-velocity Discharge into canal along south(west) sides of 1985 pond 2-D S-09 (CF-B-OS26) 35.585944 -79.039791 Intermittent NF Towards southeast and the canal 2-D S-10 35.585806 -79.038592 Stagnant Pool N/A Southeast of southeast corner of 1985 ash pond 2-D S-11 35.585012 -79.041236 Intermittent N/A Adjacent to stormwater outfall 004 discharging into canal 2-D S-12 35.587903 -79.044679 Intermittent N/A Downslope of southeast corner of 1978 ash pond 2-D S-13 35.58463 -79.047426 Intermittent N/A Downslope of southeast corner of 1978 ash pond and southeast corner of 1970 ash pond 3-D S-14 35.582439 -79.047787 Intermittent N/A Bowl-like depression south end of 1970 ash pond; drains to southeast to Cape Fear River
Seep / Discharge ID Location Coordinates (NAD 83) Flow Description Flow Measurement (MGD) and Method Background Location Discharge Location and Discharge Sampling Location Discharge Location Coordinates (NAD 83) Latitude Longitude Latitude Longitude 3-D 35.581369 -79.04895 S-15 (CF-G) 35.588886 -79.051373 Continuous 0.00090 timed-volumetric Beneath lower access road 3-D S-16 35.5903652 -79.0514205 Intermittent 0.00167 timed-volumetric 700 ft north of northern end of former 1963 ash basin 3-D S-17 35.590535 -79.051419 Intermittent 0.00015 timed-volumetric 100 ft north of s-16 (upstream Cape Fear River) 3-D Notes: 1. Flow description for each seep sample location is based on observation during site visits performed by Synterra in June, July, and October 2014.
Table 2 – Laboratory Analytical Methods
Parameter Method Reporting
Limit Units Laboratory
Fluoride (F) EPA 300.0 1 mg/l Duke Energy
Mercury (Hg) EPA 245.1 0.05 µg/l Duke Energy
Arsenic (As) EPA 200.8 1 µg/l Duke Energy
Cadmium (Cd) EPA 200.8 1 µg/l Duke Energy
Chromium (Cr) EPA 200.8 1 µg/l Duke Energy
Copper (Cu) EPA 200.8 1 µg/l Duke Energy
Lead (Pb) EPA 200.8 1 µg/l Duke Energy
Nickel (Ni) EPA 200.8 1 µg/l Duke Energy
Selenium (Se) EPA 200.8 1 µg/l Duke Energy
Table 3 – Cape Fear Steam Electric Station – Example of Surface Water /Seep Monitoring Flow and Analysis Results Table Parameter Units S-04 S-05 S-07 S-08 S-09 S-15 S-16 S-17 CF-78 AshPond CF-85 AshPond CF-Down1 CF-Down2 CF-HAW CF-SHCK-Up Fluoride mg/l < 1 < 1 < 1 < 1 < 1 < 1 2.1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 Hg ‐‐‐‐ Mercury (71900) µg/l < 1 < 1 < 1 < 1 < 1 < 1 < 0.05 < 0.05 < 1 1 < 1 < 1 < 1 < 1 As ‐‐‐‐ Arsenic (01002) µg/l 2.39 < 1 4.77 < 1 < 1 38.7 45.6 < 1 5.85 34.4 < 1 < 1 < 1 1.28 Cd ‐‐‐‐ Cadmium (01027) µg/l < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 Cr ‐‐‐‐ Chromium (01034) µg/l < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 Cu ‐‐‐‐ Copper (01042) µg/l < 1 < 1 < 1 1.04 < 1 < 1 < 1 < 1 1.29 < 1 1.2 1.26 1.01 2.01 Pb ‐‐‐‐ Lead (01051) µg/l < 1 < 1 < 1 < 1 < 1 < 1 < 1 3.79 < 1 < 1 < 1 < 1 < 1 < 1 Ni ‐‐‐‐ Nickel (01067) µg/l 3.52 9.37 4.65 5.32 4.16 4.26 207 23.9 3.67 1.92 1.32 1.20 1.10 1.76 Se ‐‐‐‐ Selenium (01147) µg/l < 1 < 1 < 1 < 1 < 1 < 1 < 1 < 1 2.39 65.7 < 1 < 1 < 1 < 1 pH s.u. 6.7 5.7 6.4 7.7 6.8 7.0 3.3 a 4.2 6.9 7.7 7.2 8.2 7.1 7.4 Temperature °C 28 24 24 28 26 19 25 a 15 32 30 29 29 27 33 Flow MGD NF 0.00102 NF 0.00323 NF 0.00090 0.00167 0.00015 NM NM NM NM NM 0.19388 Notes: 1. Flow measurements and analytical samples were collected on June 30, July 1, and October 1, 2014, by Synterra.