NC0003433_Supplemental Information For Renewal Application_20160902

4 DUKE
ENERGY.
August 31, 2016
Mr. Ron Berry
North Carolina Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: NPDES Wastewater Permit Application Submittal
Duke Energy Progress, LLC.
Cape Fear Steam Electric Plant
Permit #: NC0003433
Chatham County
Dear Mr. Berry,
Harry K. Sideris
Senior Vice President
Environmental, Health & Safety
526 S. Church Street
Mail Code: EC3XP
Charlotte, NC 28202
[phone]
RECEIVEMCDEONDWR
SEP - 2 2016
Water Quaiity
Perrnitting Section
Duke Energy Progress, LLC (Duke) is submitting herewith three copies of supplemental
information in support of the NPDES renewal application. This update is in addition to the
previous updates and requests submitted for your review.
This submittal is intended to provide an update of modifications that will be necessary to comply
with recently enacted laws and regulations including the Federal Steam Electric Effluent
Guidelines (ELG), Federal Coal Combustion Residual (CCR) rule, the North Carolina Coal ash
Management Act of 2014 and HB 630 of 2016. Specific permit requests from Duke Energy are
identified in bold throughout this submittal.
With numerous federal and state requirements to coordinate and implement in a short time for
the site, planning and sequencing of work are paramount and dynamic. As such, final scope and
sequence for all work is not complete at this time. Where scope is still not finalized, Duke has
provided a range of options that are being evaluated and provided various alternate scenarios in
an attempt to limit the number of subsequent submittals necessary. This submittal contains a
request for reinstatement of a previously permitted external outfall to waters of the United States
that has been removed from the permit during previous permit cycles. This outfall contains
wastewater that is characteristic of Outfall 007 when the plant was operational. As there has
been no discharge from this plant in the previous 4 years (except for a minor valve leak from a
riser structure in January 2016) there is no new data to provide for your review. All other
proposed modifications contained herein are internal to our wastewater process flows, it is
Duke's belief that the information provided in this submittal is of sufficient detail to allow for
review and issuance or renewed NPDES permit for the Cape Fear Steam Electric Plant. This is

Cape Fear Steam Electric Plant NPDES application update
NC0003433
Chatham County
Page 2 of 2
consistent with the guidance received from DEQ staff in a meeting on November 20, 2015 and
follow up correspondence dated January 11, 2016 and January 28, 2016.
1. Duke intends to install a wastewater treatment system to treat ash basin bulk water
and interstitial water within the 1985 and 1978 ash basins, respectively.
The treatment system for Outfall 005 will be installed on a constructed pad within the
basin. Both treatment systems will discharge at a similar flow path to their permitted
outfall. Duke requests that this flow be listed as a contributing flow to Outfall •007, or as
a contributing flow to the newly requested Outfall 008 (see below & attached).
Additional treatment of the for the dewatering process may be completed via chemical
and/or physical processes, prior to discharge to Outfall 001, Outfall 005, Outfall 007 or
the newly requested Outfall 008. This treatment system may require the addition of a
coagulant and/or flocculent to enhance solids removal. An updated Form 2C, flow
diagram, flow description and flow narrative is provided in attachment 1.
2. Duke is requesting that the outfall for the 1963/1970 pond, Outfall 008 be reinstated
under NPDES permit NC0003433
This outfall has been inactive for many years and was permitted in past NPDES permits
to convey stormwater from the 1963/1970 ash basin directly to the Cape Fear River. The
re -instated outfall would be used to facilitate the discharge of both bulk and interstitial
decanting/dewatering from the 1978 and 1985 ash basins as well as the decanting of
stormwater from the 1963/1970 ash basin to the Cape Fear River.
Treated bulk and interstitial water (as described below) from the 1985 basin and the 1978
basin would be dewatered into Outfall 008. They would then be discharged through that
outfall and out to the Cape Fear River. The 1963/1970 pond would also be dewatered
through Outfall 008. The Cape Fear Plant was recently issued an NPDES stormwater
permit, in that permit, NCDEMLR recommended that the outfall be covered under the
NPDES wastewater permit since it does not qualify as a regulated stormwater outfall
since it does not discharge the 25 year 24 hour storm event. Duke Energy requests
permit limits for the new outfall should be consistent for ash basin discharge into
the Cape Fear River. Duke Energy also requests that Outfall 001 and Outfall 005
remain in the permit in case of emergency overflow from the ash basins. An updated
Form 2C, flow diagram, flow description and flow narrative is provided in attachment 1.
Attachment 2 is an aerial photograph showing the flow path.
3. Duke Energy is requesting that the flows for Outfall 001 and Outfall 005 be
combined during the decanting/dewatering process.

Cape Fear Steam Electric Plant NPDES application update
NC0003433
Chatham County
Page 3 of 3
Duke Energy requests that the flow for the both Outfall 001 and Outfall 005 during the
bulk decanting and interstitial dewatering process be limited to 1.78 MGD, the average
combined flow of both Outfalls 001 and 005 during the last 4 years of plant operation
(2009 — 2012). This will allow for the treatment systems for each ash basin to discharge
at 500 gpm while treating both bulk and interstitial water and discharging it to Outfall
007, or the newly requested flow path to Outfall 008.
4. Option for treated landfill leachate to be routed to Outfall 005 should the option of
an on -site landfill for the excavated ash be constructed
Duke is considering both off -site and on -site disposal options for the ash removed from
the basins. If selected, the on -site landfill option would require provision for leachate
treatment — either by an off -site treatment plant or an on -site treatment plant. Duke
would like to include reference in the permit to allow for the discharge of treated leachate
should the option of an on -site coal combustion product (CCP) landfill and on -site
treatment of leachate be pursued.
5. Area of wetness (AOW) disposition.
Duke has previously identified a number of Areas of Wetness within the property. Duke
has evaluated the list of AOW's submitted to the DEQ for permit coverage. Based upon
further review of sampling data, Duke withdraws requests for coverage from areas
previously identified as S-01, S-02, S-03, S-06, S-011, S-13 and S-14. This request is
based on location of the respective AOW and/or review of sampling data that confirms
the lack of pollutants associated with plant activities being released to Waters of the State
from this point. Duke requests that DEQ provide concurrence or acknowledgement
of this request in the NPDES Fact Sheet for the permit. Duke has also identified
several AOW's upstream of permitted Outfall 007. Duke requests that these AOW's
be listed as contributing flows to Outfall 007 in either the NPDES permit or the
NPDES permit fact sheet as follows: AOW's that are contributing flows to NPDES
Outfall 007 are: S-05, S-07, S-08, S-09, and S-12. Duke requests that any future
AOW's that are identified and are tributary to these permitted outfalls not require
notification to DEQ. See attachment 4 for an updated identified sampling point
aerial photo.
6. Duke intends to construct a groundwater extraction well system
The extraction well system, may be needed in the future, to remediate groundwater in the
area of the ash basins, it is expected to discharge at approximately 600 gpm or 0.864
MGD. The extracted ground water will require additional treatment before being
released to the environment. Additional treatment of the extracted groundwater water
may be completed via chemical and/or physical processes prior to discharge to Outfall

Cape Fear Steam Electric Plant NPDES application update
NC0003433
Chatham County
Page 4 of 4
001, Outfall 005, Outfall 007, or Outfall 008. This treatment system may require the
addition of a coagulant and/or flocculent to enhance solids removal.
We appreciate your attention to these requests and look forward to finalizing the NPDES permit
for the Cape Fear Steam Electric plant in the near future. Should you have any questions
regarding this letter or require additional information, please contact Mr. Steve Cahoon at (919)
546-7457 or at [e-mail].
"I certify, under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief, true, accurate,
and complete. 1 am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations. "
Sincerely,
qAn
Harry Sideris
SVP - Environmental, Health & Safety
Enclosures
NCDEQ cc: Sergei Chernikov
Duke Energy cc: Issa Zarzar, Steve Cahoon, Jonathan Stamas, Cedric Fairbanks

Attachment 1
Revised Form 2C, Flow diagram and descriptions,
NPDES Permit Narrative, and updated Chemical list
August 31, 2016 'NPDES application update
Cape Fear Steam Electric Plant
NC0003433

EPA I.D. NUMBER (copyfromItem I of Form 1) Form Approved.
NCD000830919 OMB No.2040-0086.
Please print or type in the unshaded areas only. I I Approval expires 3-31-98.
FORM
2C
NPDES
U.S. ENVIRONMENTAL PROTECTION AGENCY
FOR PERMIT TO DISCHARGE WASTEWATER
1401 EPA EXISTING MANUFACTURING,JCOMMERCIAL, MINING AND SILVICULTURE OPERATIONS
Consolidated Permits Program
I. OUTFALL LOCATION
For each ouffall, list the latitude and longitude of its location to the nearest 15 seconds and the name of the receiving water.
A. OUTFALL NUMBER
(list)
B. LATITUDE
C. LONGITUDE
D RECEIVING WATER (name)
1. DEG.
2. MIN
3 SEC
1 DEG
2. MIN
3 SEC.
007
35
35
15
79
02
39
Unnamed tributary to Cape Fear River
008
35
34
57
79
02
59
Cape Fear River
II. FLOWS, SOURCES OF POLLUTION, AND TREATMENT TECHNOLOGIES
A. Attach a line drawing showing the water flow through the facility. Indicate sources of intake water, operations contributing wastewater to the effluent, and treatment units
labeled to correspond to the more detailed descriptions in Item B Construct a water balance on the line drawing by showing average flows between intakes, operations,
treatment units, and outfalls If a water balance cannot be determined (e.g., for certain mining activities), provide a pictorial description of the nature and amount of any
sources of water and any collection or treatment measures.
B. For each outall, provide a description of: (1) All operations contributing wastewater to the effluent, including process wastewater, sanitary wastewater, cooling water,
and storm water runoff, (2) The average flow contributed by each operation; and (3) The treatment received by the wastewater. Continue on additional sheets if
necessary
1 OUT-
2. OPERATION(S) CONTRIBUTING FLOW
3. TREATMENT
FALL
NO. (list)
a. OPERATION (list)
b. AVERAGE FLOW
(include units)
a. DESCRIPTION
b. LIST CODES FROM
TABLE 2C-1
007
Ash pond discharge
2.5 MGD (historic flows)
Sedimentation, neutralization
1-U
2-K
Once-thru cooling flow w/ towers
0 MGD
Evaporation
1-F
Once-thru cooling flow w/o towers
0 MGD
Evaporation
1-F
Low volume wastes
0 MGD
Sedimentation, neutralization
1-U
2-K
Coal pile runoff
0 MGD
Sedimentation
1-U
Storm water runoff (non categorical)
0.18 MGD
Sedimentation
1-U
Sanitary wastes
0 MGD
Oxidation, sedimentation,
2-B
1-U
disinfection
2-F
treated bulk/interstitial ash
1.78 MGD (future)
basin water
treated landfill leachate
0.01 - 0.1 MGD (future)
Stormwater from 1963/1970 ash basin
Est. 0.72 MGD
Sedimentation, neutralization
1-U
2-K
008
Ash pond discharge
2.5 MGD (historic flows)
Sedimentation, neutralization
1-U
2-K
Once-thru cooling flow w/ towers
0 MGD
Evaporation
1-F
Once-thru cooling flow w/o towers
0 MGD
Evaporation
1-F
0 MGD
Sedimentation, neutralization
1-U
2-K
0 MGD
Sedimentation
1-U
Sedimentation
1-U
0 MGD
Oxidation, sedimentation,
2-8
1-U
disinfection
2-F
treated bulk/interstitial ash
1.78 MGD (future)
basin water
treated landfill leachate
0.01 - 0.1 MGD (future)
Stormwater from 1963/1970 ash basin
Est. 0.72 MGD
Sedimentation, neutralization
1-U
2-K
OFFICIAL USE ONLY (effluent gutdehnessub-categories)
EPA Form 3510-2C (8-90) PAGE 1 of 4 CONTINUE ON REVERSE

CONTINUED FROM THE FRONT
C. Except for storm runoff, leaks, or spills, are any of the discharges described in Items II -A or B intermittent or seasonal?
❑ YES (complete thefollowing table) NO (go to Section III)
3. FREQUENCY
4 FLOW
a DAYS PER
B. TOTAL VOLUME
2 OPERATION(s)
WEEK
b. MONTHS
a FLOW RATE (,n mgd)
(specifyuvith emits)
1. OUTFALL
NUMBER (list)
CONTRIBUTING FLOW
(list)
(specify
PER YEAR
(spec�merage)
1. LONGTERM
2 MAXIMUM
1. LONGTERM
2. MAXIMUM
C DURATION
average)
AVERAGE
DAILY
AVERAGE
DAILY
(in dap)
III. PRODUCTION
A. Does an effluent guideline (imitation promulgated by EPA under Section 304 of the Clean Water Act apply to your facility?
® YES (complete Item III-B) ❑ NO (go to Section III)
B. Are the limitations in the applicable effluent guideline expressed in terms of production (or other measure of operation)?
❑ YES (complete Item III-0 m NO (go to Section IV)
C If you answered "yes" to Item III-B, list the quantity which represents an actual measurement of your level of production, expressed in the terms and units used in the
applicable effluent guideline, and indicate the affected outfalls.
1. AVERAGE DAILY PRODUCTION
2. AFFECTED OUTFACES
(fist outfall numbers)
a. QUANTITY PER DAY
b UNITS OF MEASURE
c. OPERATION, PRODUCT, MATERIAL, ETC.
(sped)
IV. IMPROVEMENTS
A. Are you now required by any Federal, State or local authority to meet any implementation schedule for the construction, upgrading or operations of wastewater
treatment equipment or practices or any other environmental programs which may affect the discharges described in this application? This includes, but is not limited to,
permit conditions, administrative or enforcement orders, enforcement compliance schedule letters, stipulations, court orders, and grant or loan conditions.
❑ YES (complete the following table) NO (go to Item IVA
1. IDENTIFICATION OF CONDITION,
AGREEMENT, ETC.
2. AFFECTED OUTFALLS
3. BRIEF DESCRIPTION OF PROJECT
4. FINAL COMPLIANCE DATE
a. NO
b SOURCE OF DISCHARGE
a. REQUIRED
b. PROJECTED
B. OPTIONAL: You may attach additional sheets describing any additional water pollution control programs (or other environmental projects which may affect your
discharges) you now have underway or which you plan. Indicate whether each program is now underway or planned, and indicate your actual or planned schedules for
construction.
❑ MARK "X" IF DESCRIPTION OF ADDITIONAL CONTROL PROGRAMS IS ATTACHED
EPA Form 3510-2C (5-90) PAGE 2 of 4 CONTINUE ON PAGE 3

EPA I.D.'NUMBER (copyfromhem I of Form 1)
CONTINUED FROM PAGE NCD000830919
V. INTAKE AND EFFLUENT CHARACTERISTICS
A, B, & C: See instructions before proceeding — Complete one set of tables for each outfall — Annotate the outfall number in the space provided.
NOTE: Tables V-A, V-B, and V-C are included on separate sheets numbered V-1 through V-9.
D. Use the space below to list any of the pollutants listed in Table 2c-3 of the instructions, which you know or have reason to believe is discharged or may be discharged
from any outfall. For every pollutant you list, briefly describe the reasons you believe it to be present and report any analytical data in your possession.
1.POLLUTANT
2.SOURCE
1.POLLUTANT
2.SOURCE
Asbestos
Trace amounts in insulation
Strontium
Trace amounts in coal
Uranium
Trace amounts in coal
Vanadium
Trace amounts in coal
Zirconium
Trace amounts in coal
VI. POTENTIAL DISCHARGES NOT COVERED
BY ANALYSIS
Is any pollutant listed in Item V-C a substance
or a component of a substance which you
currently use or manufacture as an intermediate
or final product or byproduct?
mYES (list afi such pollutants
below ) ❑
NO (ga to It,. VI-B)
The following substances may be present in coal:
Antimony
Arsenic
Beryllium
Cadmium
Chromium
Copper
Lead
Mercury
Nickel
Selenium
Silver
Thallium
Zinc
See Attachment 4 for other potential discharges not covered by analyses.
EPA Form 3510-2C (8-90) PAGE 3 of 4 CONTINUE ON REVERSE

CONTINUED FROM THE FRONT
VII.BIOLOGICAL TOXICITY TESTING DATA
Do you have any knowledge or reason to believe that any biological test for acute or chronic toxicity has been made on any of your discharges or on a receiving water in
relation to your discharge within the last 3 years?
©YES(identify the iest(s)and describe their purposes below) ❑NO(go to Section Vlll)
As required by the current NPDES permit chronic toxicity tests have been performed on a quarterly basis on
the combined wastewater dicharge (Outfall 007) . All tests have passed for the last three years.
VIII.CONTRACT ANALYSIS INFORMATION
Were any of the analyses reported in Item V performed by a contract laboratory or consulting firm?
®YES(list the name,address,and telephone number of,and pollutants analyzed by, ❑NO(go to Section IX)
each.such laboratory or firm below)
A.NAME B.ADDRESS C.TELEPHONE D, POLLUTANTS ANALYZED
(area code&no (list)
Pace Analytical Labs Pace Analytical Services, Inc. [phone] All pollutants
2225 Riverside Drive
Asheville, NC 28804
IX.CERTIFICATION
1 certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that
qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system or those persons
directly responsible for gathering the information,the information submitted is,to the best of my knowledge and belief,true,accurate,and complete 1 am aware that there
are significant penalties for submitting false information,including the possibility of fine and imprisonment for knowing violations
A.NAME&OFFICIAL TITLE(type or print) B.PHONE NO.(area code&no.)
Harry K. Sideris, SVP Environmena/tal, Health and Safety (704) 382-4303
C.SIGNATURE D.DATE SIGNED
EPA Form 3510-2C(8-90) PAGE 4 of 4

Duke Energy Progress, Inc.
NPDES Permit NC0003433 -
Cape Fear Steam Electric Plant
2016 Permit Application Amendment
Attachment 2 Form 2C
Item II -A Line Drawing
Ground Water well
L
Supplemental Wastewater
Extraction system
G
Treatment (consists of
F
clarifiers, oxidative/reductive
media filters, ion exchange,
Evaporation
reverse osmosis, filter
F
press) Additional treatment
Landfill
added, as necessary.
Leachate
rAsh
B
F J
Storage
Seepage �—d
Tanks
Outfall005
Cape E C Effluent D Cape
Fear Intake Structure Channel Fear
River Outfall Outfall River
003 007
Parking Lot Drains
Pump Station
No. 5
Pump Station
No. 9
West
Pump Station Ash Pond (1978)
No. 1
Low Volume
Retention Basin
OM separator
Pump Station
No. 3
Seepage
Evaporation
A
Ash Pond K Outfall
(1963/1970) —> 008
Outfall
001 H
K
I
Supplemental Wastewater
Treatment (consists of
clarifiers, oxidative/reductive
media filters, ion exchange,
reverse osmosis, filter press)
H Additional treatment added, as
necessary.
Sludge Disposal
South Side
Yard Drains
H
Ground Water well
L Extraction system
A2-2

Duke Energy Progress, Inc. NPDES Permit NC0003433
Cape Fear Steam Electric Plant 2014 Permit Application Amendment
Attachment 2
Form 2C - Item II -A Line Drawing Flows
Flows
Estimated Average Flow
Comments
A
0.58 MGD
Outfall 001 — West ash pond effluent to effluent channel
(based on historic flows)
B
0.66 MGD
Outfall 005 — East ash pond effluent to effluent channel
(based on historic flows)
C
0
Outfall 003 — Once through cooling water to effluent channel
D
1.24 MGD
Outfall 007 — Discharge to tributary of the Cape Fear River
(based on historic flows from ash ponds)
E
0
Cape Fear River intake
F
0.72 MGD
Discharge from 1985 Ash basin WWTP to Outfall 005 or 008
G
0.3 MGD
Est. low volume waste and stormwater return flow from ash
basin WWTP to 1985 ash basin
H
0.72 MGD
Discharge from 1978 Ash basin WWTP to Outfall 001 or 008
I
0.3 MGD
Est. low volume waste and stormwater return flow from ash
basin WWTP to 1978 ash basin
J
0.010-0.1 MGD
Landfill Leachate
K
Est. 0.72 MGD
Stormwater 1963/1970 ash basin
L
Est 0.864 MGD
GW well extraction system
A2-1

Duke Energy Progress, Inc. NPDES Permit NC0003433
Cape Fear Steam Electric Plant 2016 Permit Application Amendment
Attachment 3
Form 2C - Item II-B Description of Operations Contributing Wastewater
The Cape Fear Steam Electric Plant is a retired steam cycle electric generating plant that formerly
consisted of two coal-fired units, two heat recovery boilers and four Internal Combustion (IC) Turbines.
The site was retired in 2011 and is currently being demolished. No industrial activity is currently occurring
onsite.
All wastewaters formerly generated by the site historically discharged to the effluent channel prior to the
combined outfall (Outfall 007). Components of the discharges and wastestreams are described below.
Additionally, a detailed map with the location of various seeps on the property is being provided as part of
this permit application.
An NPDES industrial stormwater permit was issued by DEMLR for two stormwater outfalls (SW-002 and
SW-003) at the Cape Fear Plant. A discussion of those outfalls is included in this document following the
wastewater discussion.
Chemical constituents contained in the discharges from this site will, in part, be representative of the
naturally -occurring chemical quality of the intake water and will also have chemical constituents of such
quality and quantity associated with similar discharges for fossil generating facilities of this size, type, and
in the geographical location. Either all or part of the elements listed on the Periodic Table, either
singularly or in any combination, may from time to time be contained in the discharge until the ash basins
are permanently closed.
Outfall 007 Combined Wastewater Discharge
This outfall contains all waste stream flows including West Ash Pond discharge, once -through cooling
water, and East Ash Pond discharge. Outfall 007 is located in the effluent channel approximately 250
feet downstream of the last internal outfall. Downstream of the effluent channel, the manmade canal
becomes an unnamed tributary which flows to the Cape Fear River.
West Ash Pond (1978 Pond) Discharge — Internal Outfall 001
The West Ash Pond currently receives stormmwater from the yard pump station.
The dry areas of the ash pond may be treated with dust suppressant. Although all waste stream
contributions to the ash pond will be eliminated, waste water remaining in the basin will continue to be
removed through existing outfalls. As the water in the ash pond lowers, additional treatment may be
brought onsite to ensure the ash pond discharge maintains compliance with NPDES permitted limits,
such as a portable filtration unit. Descriptions of the individual waste streams are below.
Bulk water decanting/Interstitial Dewatering
Bulk and interstitial Ash basin water will be decanted/dewatered from the 1978 ash pond through
Outfall 001 to either Outfall 007 or to Outfall 008. Additional wastewater equipment has been
brought onsite to assist in the bulk and interstitial decanting/dewatering. The additional
wastewater treatment consists of:
• Ballasted flocculation;
• Catalytic oxidation media filters;
• Coagulant, polymer, and additive feed systems;
• Ion exchange resin;
• Reverse osmosis system;
A3-1

Duke Energy Progress, Inc.
Cape Fear Steam Electric Plant
• Filter press trailers and sludge holding tanks
NPDES Permit NC0003433
2016 Permit Application Amendment
Low volume wastes from the wastewater treatment system (WTS) as well as stormwater from the
WTS pad area are recycled back to the ash pond. Sludge is removed from the system. The WTS will
only discharge through Outfall 001.
Historically, the west ash pond received coal pile runoff, settling basin drains, No. 2 fuel oil tank runoff,
sand bed filter backwash, parking lot drains, equipment cooling tower blowdown and drain, boiler
blowdown, oil unloading area drains, demineralizer regenerate, various yard and floor drains, ash trench
drain, and miscellaneous low volume wastes. This pond also received bottom and fly ash either by ash
transport system waters or by truck. The ash pond provides treatment by sedimentation, oxidation,
neutralization, equalization, and adsorption.(Ceased)
Coal Pile Runoff
The coal has been removed and the "coal pile area" has been covered with soil and graded in
accordance with an approved Erosion and Sedimentation Control Plan. Historically, storm water
runoff from the coal pile was routed to the West Ash Pond for treatment. (Ceased)
Low Volume Wastes
The low volume wastes retention basin contains an oil water separator and historically received
various plant process wastes streams and stormwater from industrial areas. In 2013 Duke Energy
submitted to NCDENR a 90- day closure letter for this basin. This basin will be cleaned and breached
in accordance with that closure letter. Comingled wastewater from this basin flowed to the West Ash
Pond. (Ceased)
Boiler blowdown, drainage, and wastes from the equipment cooling tower and its associated heat
exchangers may have contained minute quantities of treatment chemicals. The small quantities of
these low volume wastes were sent to the low volume wastes retention basin.
Miscellaneous Wastes
Plant area floor and yard drains were routed to the West Ash Pond and included equipment drainage
wash down water, and rainfall runoff. Drains from areas likely to contain oil -filled equipment or
storage were routed to the low volume wastes retention basin which contained an oil/water separator.
Waste oil was disposed of according to the appropriate regulations. (Ceased)
Internal combustion turbine facility false start drain tanks were discharged into the low volume wastes
retention basin. (Ceased)
Cooling tower basin sludge; residuals from the low volume wastes retention basin and the coal pile
ditch; ash trench materials; circulating water tunnel sediment; boiler, electrostatic precipitator, and
associated appurtenances vacuuming sediments; sludge from catch basins, sumps, etc.; and other
miscellaneous low volume wastes from plant process were also transported to the West Ash Pond.
(Ceased)
Once -through Cooling Water — Internal Outfall 003
Once -through condenser cooling water for the coal fired units and heat recovery units was withdrawn
from the Cape Fear River, passed through the condenser, and discharged directly into the effluent
channel. Some cooling was accomplished in the effluent channel. When the temperature at Outfall 007
approached 32°C, cooling towers were placed in service to keep the channel water at or below 32°C.
East Ash Pond (1985 Pond) — Internal Outfall 005
Currently no wastestreams are routed to the east ash pond. The dry areas of the ash pond may be
treated with dust suppressant.
Although all waste stream contributions to the ash pond have been eliminated, waste water remaining in
the basin will continue to be removed through existing outfalls.
A3-2

Duke Energy Progress, Inc. NPDES Permit NC0003433
Cape Fear Steam Electric Plant 2016 Permit Application Amendment
Bulk water decanting/Interstitial Dewatering
Bulk and interstitial Ash basin water will be decanted/dewatered from the 1978 ash pond through
Outfall 001 to either Outfall 007 or to Outtall 008. Additional wastewater equipment has been
brought onsite to assist in the bulk and interstitial decanting/dewatering to ensure the ash pond
discharge maintains compliance with NPDES permitted limits. The additional wastewater
treatment consists of:
• Ballasted flocculation;
• Catalytic oxidation media filters;
• Coagulant, polymer, and additive feed systems;
• Ion exchange resin;
• Reverse osmosis system;
• Filter press trailers and sludge holding tanks
Low volume wastes from the wastewater treatment system (WTS) as well as stormwater from the
WTS pad area are recycled back to the ash pond. Sludge is removed from the system. The WTS will
only discharge through Outfall 001.
The East Ash Pond historically received ash transport waters (bottom and fly ash), runoff from yard
drains, air preheater washes, electrostatic precipitator washes, spent sandblast material, sewage
treatment plant effluent, and miscellaneous low volume wastes. The ash pond provides treatment by
sedimentation, oxidation, neutralization, equalization, and adsorption. Descriptions of the individual
historical waste streams are below.
Ash Sluice Water
Fly ash and bottom ash from both units were hydraulically conveyed by an ash sluice pipeline to the
ash pond. As needed, alum was added to the ash sluice influent to aid settling. (Ceased)
A Rotamie system was used to inject urea into Units 5 and 6. In the boiler, the ammonia/urea
reacted with NOx to form water vapor and nitrogen. The system was designed to minimize any
ammonia formation and ammonia slip. Any unreacted ammonia adsorbed on the fly ash from this
system was carried to the ash pond via ash sluice water. (Ceased)
Sanitary Waste Treatment Effluent
Historically, sanitary wastes were treated at an extended aeration package plant prior to discharge to
the East Ash Pond which provided secondary treatment for the effluent. Currently, sanitary wastes
are treated in an onsite septic system permitted by Chatham County. Temporary, portable toilets are
occasionally brought on site as needed to accommodate staffing levels. (Ceased)
Miscellaneous Wastes
Cooling tower basin sludge; residuals from the low volume wastes retention basin and coal pile
retention basin; ash trench materials; circulating water tunnel sediment; boiler, electrostatic
precipitator wash, spent sandblast material, air preheater wash, and other miscellaneous low volume
wastes from plant process were also transported to the East Ash Pond. (Ceased)
Landfill Leachate
In the future, Duke Energy plans to discharge wastewater from an onsite coal ash landfill. Landfill
leachate from the lined landfill will be collected in two 500,000 gallon tanks and routed to the WTS for
additional treatment and discharge through Outfall 008. Non contact stormwater will be collected in
retention ponds and permitted initially as construction stormwater under the NC construction general
A3-3

Duke Energy Progress, Inc. NPDES Permit NC0003433
Cape Fear Steam Electric Plant 2016 Permit Application Amendment
permit NCG120000. Once the landfill is capped, non contact water will also be routed along the
ground surface to the retention ponds. The ponds are designed to capture the 25 year, 24-hour storm
with an additional 1 foot of freeboard.
Outfall 008
As requested with the accompanying cover letter Duke Energy requests that the former Outfall Sw-008,
be reinstated in the NPDES permit as a wastewater Outfall 008 to aid in the bulk decanting and interstitial
dewatering process. This outfall contains treated bulk decanted and interstitial dewatering waste water
from all flows listed in this permit as ceased from both the 1978 ash pond (Outfall 001) and the 1985 ash
pond Outfall 005. It would also contain decanted stormwater from the 1963/1970 ash pond. These flows
are listed below.
West Ash Pond (1978 Pond) Discharge — Internal Outfall 001
Coal Pile Runoff
The coal has been removed and the "coal pile area" has been covered with soil and graded in
accordance with an approved Erosion and Sedimentation Control Plan. Historically, storm water
runoff from the coal pile was routed to the West Ash Pond for treatment. (Ceased)
Low Volume Wastes
The low volume wastes retention basin contains an oil water separator and historically received
various plant process wastes streams and stormwater from industrial areas. In 2013 Duke Energy
submitted to NCDENR a 90- day closure letter for this basin. This basin will be cleaned and breached
in accordance with that closure letter. Comingled wastewater from this basin flowed to the West Ash
Pond. (Ceased)
Boiler blowdown, drainage, and wastes from the equipment cooling tower and its associated heat
exchangers may have contained minute quantities of treatment chemicals. The small quantities of
these low volume wastes were sent to the low volume wastes retention basin.
Miscellaneous Wastes
Plant area floor and yard drains were routed to the West Ash Pond and included equipment drainage
wash down water, and rainfall runoff. Drains from areas likely to contain oil -filled equipment or
storage were routed to the low volume wastes retention basin which contained an oil/water separator.
Waste oil was disposed of according to the appropriate regulations. (Ceased)
Internal combustion turbine facility false start drain tanks were discharged into the low volume wastes
retention basin. (Ceased)
Cooling tower basin sludge; residuals from the low volume wastes retention basin and the coal pile
ditch; ash trench materials; circulating water tunnel sediment; boiler, electrostatic precipitator, and
associated appurtenances vacuuming sediments; sludge from catch basins, sumps, etc.; and other
miscellaneous low volume wastes from plant process were also transported to the West Ash Pond.
(Ceased)
East Ash Pond (1985 Pond) Discharge — Internal Outfall 005
Ash Sluice Water
Fly ash and bottom ash from both units were hydraulically conveyed by an ash sluice pipeline to the
ash pond. As needed, alum was added to the ash sluice influent to aid settling. (Ceased)
A Rotamix° system was used to inject urea into Units 5 and 6. In the boiler, the ammonia/urea
reacted with NOx to form water vapor and nitrogen. The system was designed to minimize any
ammonia formation and ammonia slip. Any unreacted ammonia adsorbed on the fly ash from this
system was carried to the ash pond via ash sluice water. (Ceased)
A3-4

Duke Energy Progress, Inc. NPDES Permit NC0003433
Cape Fear Steam Electric Plant 2016 Permit Application Amendment
Sanitary Waste Treatment Effluent
Historically, sanitary wastes were treated at an extended aeration package plant prior to discharge to
the East Ash Pond which provided secondary treatment for the effluent. Currently, sanitary wastes
are treated in an onsite septic system permitted by Chatham County. Temporary, portable toilets are
occasionally brought on site as needed to accommodate staffing levels. (Ceased)
Miscellaneous Wastes
Cooling tower basin sludge; residuals from the low volume wastes retention basin and coal pile
retention basin; ash trench materials; circulating water tunnel sediment; boiler, electrostatic
precipitator wash, spent sandblast material, air preheater wash, and other miscellaneous low volume
wastes from plant process were also transported to the East Ash Pond. (Ceased)
Storm Water
In 2016, Duke Energy Progress, Inc. applied for an individual stormwater permit (prior to that, stormwater
outfalls were included in the NPDES wastewater permit). Since 2013, the site has been further
demolished and holds an approved Erosion and Sedimentation Control Plan, which subjects the site to
the requirements of the Construction Stormwater General Permit.
The following descriptions apply to the SW outfalls identified in DEP's 2011 application for an individual
stormwater permit.
Outfall SW-1 and Outfall SW-8 are legacy riser structures from inactive ash ponds. Discharges of
stormwater from these outfalls are rare and NCDENR has concurred with the estimation that it would take
greater than the 25-year, 24- hour storm event to generate a discharge from these outfalls. DEMLR
chose not to include these outfalls as stormwater outfalls.
The riser structure from Outfall SW-1 has been decommissioned and can no longer discharge stormwater.
The riser structure from Outfall SW-008 has been improved, and DEMLR recommended that that outfall
be placed into the NPDES permit.
Stormwater collected along the railroad track between the plant entrance road and the plant site
combines with the drainage of an open field which is directed via Outfall SW-2 into Shaddox Creek that
flows into the Haw River just above the confluence with the Deep River. Historically, coal was moved
along the railroad track, however coal is no longer brought onsite. There is currently no industrial activity
occurring within this drainage area.
Stormwater collected along the roadside swell beside the plant entrance road is directed via Outfall SW-3
towards drainages that go to Shaddox Creek. Historically this location was selected to capture potential
impacts from an ash sluice line that crossed under the entrance road. Ash is no longer sluiced and the
line has been physically disconnected.
Other Wastes
Herbicide Usage in the Treatment System Ponds
Herbicides are used as needed to control nuisance aquatic vegetation. These herbicides are applied by
licensed applicators, or persons under the immediate supervision of a licensed applicator, in accordance
with the manufacturer's instructions.
A3-5

Duke Energy Progress, Inc. NPDES Permit NC0003433
Cape Fear Steam Electric Plant 2016 Permit Application Amendment
Attachment 4
Form 2C - Item VI Potential Discharges Not Covered by Analysis
Estimated
Quantity
Chemical(per
ear
Frequency
Purpose
Wood fibers in proprietary binder mixture
350-750
lb/acre per
Every 4
months or
Soil stabilizer and dust control
(BioCoverSS)
application
as needed
for ash pond
Anionic Water Soluble Polymer in
825 gal
Every 4
months or
Soil stabilizer and dust control
Emulsion (EcoGreen Barrier)
as needed
for ash pond
Recycled paper (Country Boy Cellulose
700 bales
Every 4
months or
Soil stabilizer and dust control
Fiber)
as needed
for ash pond,
Bentonite, hydrated aluminum silicate
12,500 Ibs
Every 4
months or
Soil stabilizer and dust control
(BEN -GEL)
as needed
for ash pond
Ash Pond Water Wastewater Treatment System
Chlorine Dioxide
< 500
As needed
Biofouling control
gallons
Sulfuric Acid (98%)
< 500
As needed
Membrane cleaning
gallons
ChemTreat P860E Polymer
<1000
Continuous
Polymer
gallons
Ferric Chloride
30,000
Continuous
Wastewater treatment additive
gallons
Sodium Hypochlorite
30,000
Continuous
Wastewater treatment additive
gallons
Sodium Bisulfite
2,000
Continuous
Wastewater treatment additive
gallons
ChemTreat RL9004
<1000
As needed
Antiscalant
gallons
Sodium Hydroxide
<10,000
Continuous
Wastewater treatment additive
gallons
Listed chemicals are no longer being utilized for the purposes identified below. However, they
were used during historic operations and trace amounts have the potential to be discharged
during plant demolition.
No Longer
Aluminum sulfate
None
Used
Water treatment flocculent
No Longer
Aluminum chloroh drate
None
Used
Water treatment coagulant
GEBetz Spectrus OX103
(1-bromo-3-chloro-5,5-
No Longer
dimeth Ih dantoin)
None
Used
Biofouling control
No Longer
Biofouling control in sewage
Calcium hypochlorite
None
Used
treatment
Sanuril 115
(calcium hypochlorite and 1-bromo-3-
No Longer
Biofouling control in sewage
chloro-5,5-dimeth Ih dantoin
None
Used
treatment
AB Cutrine Plus
(copper carbonate, triethanolamine,
No Longer
monoethanolamine)
None
Used
Algae control in ash ponds
A4-1

Duke Energy Progress, Inc. NPDES Permit NC0003433
Cape Fear Steam Electric Plant 2016 Permit Application Amendment
Estimated
Quantity
Chemical(per
ear
Frequency
Purpose
Cygent Plus
(alkyl hydroxypoly oxyethylene,
No Longer
d'limonene)
None
Used
Algae control in Ash Ponds
No Longer
VITEC 3000 (proprietary)
None
Used
Antiscalant
No Longer
Oxygen scavenger; passivating
Steamate PAS3040 (proprietary)
None
Used
agent
GEBetz Steamate PAS3040
No Longer
Oxygen scavenger; passivating
h dro uinone
None
Used
agent
GEBetz Steamate NA0240
No Longer
mor holine
None
Used
pH control in condensate
No Longer
Sodium hydroxide
None
Used
pH control
No Longer
Caustic soda (anhydrous)
None
Used
pH control
GEBetz Optisperse HP9410
No Longer
Solids dispersant in boiler, pH
monosodium phosphate)
None
Used
control
No Longer
Solids dispersant in boiler, pH
Disodium phosphate
None
Used
control
No Longer
Solids dispersant in boiler, pH
Trisodium phosphate
None
Used
control
No Longer
Solids dispersant in boiler, pH
Sodium polyphosphate
None
Used
control
Dianodic DN2126
(phosphoric acid, potassium hydroxide,
No Longer
1-H-benzotriazole, methyl tol Itriazole)
None
Used
Corrosion inhibitor
No Longer
NOx control during ozone
Aqueous urea 50%
None
Used
months
No Longer
Citric acid 50%
None
Used
Boiler cleaning
No Longer
Sodium nitrite
None
Used
Boiler cleaning
No Longer
Ammonium bicarbonate
None
Used
Boiler cleaning
No Longer
Soda ash
None
Used
Boiler cleaning, if needed
No Longer
Ammonium persulfate
None
Used
Boiler cleaning, if needed
No Longer
Ammonium bifluoride
None
Used
Boiler cleaning, if needed
No Longer
Sodium bromate
None
Used
Boiler cleaning, if needed
No Longer
Hydrochloric acid
None
Used
Boiler cleaning, if needed
No Longer
Eth lenediaminetetraacetic acid EDTA
None
Used
Boiler cleaning, if needed
No Longer
ChelClean 675 (proprietary)
None
Used
Boiler cleaning, if needed
Renewz
No Longer
sodium hydroxide, potassium silicate
None
Used
Condenser coil cleaning
TC-X10 Plus
No Longer
sodium hydroxide)
None
Used
Steam cleaning
A4-2

Duke Energy Progress, Inc. NPDES Permit NC0003433
Cape Fear Steam Electric Plant 2016 Permit Application Amendment
Estimated
Quantity
Chemical(per
ear
Frequency
Purpose
No Longer
RoClean L403 (proprietary)
None
Used
RO membrane cleaning
No Longer
RoClean P111 (proprietary)
None
Used
RO membrane cleaning
No Longer
RoClean P303A (proprietary)
None
Used
RO membrane cleaning
20 Degree Baume Muriatic Acid
No Longer
(hydrochloric acid
None
Used
RO membrane cleaning
No Longer
Morton softener salt
None
Used
RO softener regeneration
No Longer
Cargill salt
None
Used
EDI cleaning
Cl 38B (Alum)
No Longer
aluminum chloroh drate
None
Used
TSS control in ash pond
No Longer
Laundry detergent (e.g., Tide
None
Used
Laundry cleaner
No Longer
Bleach
None
Used
Laundry cleaner
No Longer
Weed herbicide (e.g., Roundup)
None
Used
Weed killer treatment
Ant pesticide
No Longer
(e.g., h drameth Inon inerts
None
Used
Ant killer treatment
No Longer
Alkyl alcohol
None
Used
Freeze conditioning agent
No Longer
Propylene glycol
None
Used
Freeze conditioning agent
No Longer
Calcium chloride
None
Used
Freeze conditioning agent
No Longer
Dieth lene glycol
None
Used
Freeze conditioning agent
No Longer
Glycerin
None
Used
Freeze conditioning agent
A►4-3

Attachment 2
Aerial Photograph depicting proposed Outfall 008
and wastewater treatment system discharge routs
from the 1978 and 1985 ash basins
August 31, 2016 NPDES application update
Cape Fear Steam Electric Plant
NC0003433

Outfall 005
1985 Ash Pond 85 Pump Outfall 007
System
!, M
r! Cape Fear Plant s L Jurisdictional
- waters
✓ K �,/' /'�� Non Jurisdictional
ti r waters
78 Pump Outfall 001
system
1978 Ash Pond
1956 Ash Pond -I -- -- -
- 70 Impoundment
r / (Gravity)
1970 Ash Pond
Re -permitted
Outfall 008
Q 2016 Google
L
Imagery Date: 41SQ016 t 1993 17 S 677238.54 m E 3939510.21 m N elev 170 it
0201OGoogte�
e Eye alt 10189 it O

Attachment 3
Possible Future Condition Cape Fear CCP Landfill
Data Comparison Untreated Mayo CCP Landfill
leachate data
August 31, 2016 NPDES application update
Cape Fear Steam Electric Plant
NC0003433

TABLE 8
LEACHATE FIELD AND ANALYTICAL RESULTS
MAYO CCP LANDFILL PHASE I - PERMIT NO.7305
MAYO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, ROXBORO, NC
Sample Date' Aprli 6, 2016 Laboratory CertiOeate Codes,
Werra Corporation field t559
5ie(d Sampling perforr�d icy SynTerra Corporation Duke Eortagy Analytical Laboratory S24E
Parameter
SWS ID
Urds
Certificate Code
Sample Location
RDL
S VSL
7305 L-1.
Feld pH
320
SU
5,591
7.9
-
NE
Specific Conductance
323
umhoJcm
5,591
305
-
NE
Temperature
325
°C
5,591
14
-
NE
Arsenic
14
µg/L
248
14.7
1
10
Barium
15
µg/L
248
61
5
100
Boron
428
µg/L
248
1,270
50
NE
Cadmium
34
µOL
248
< 1
1
1
Chloride
455
µg/L
248
39=0
1,000
NE
Chromium
51
µg/L
248
26
5
10
Copper
54
µg/L
248
< 5
5
10
Fluoride
312
µg/L
248
130
100
2,000
Iron
340
µg/L
248
416
10
300
Lead
131
pg/L
248
< 1
1
10
Manganese
342
µg/L
248
8
5
50
Mercury
132
µg/L
248
a 0.05
0:05
0.2
Nickel
152
pg/L
248
34
5
50
Nib -ate (as Nitrogen)
303
µg/L
248
630
23
10,000
Selenium
183
µg/L
248
1.7
1
10
Silver
184
pg/L
248
< 5
5
10
Sulfate
315
119/L
248
130,000
2,000
250,000
Total Dissolved Solids
311
µg/L
248
330,000
25,000
NE
Zinc
213
µg/L
248
204
5
10
rEp=:u ur: gj ulcum vr. j"
I. . Canlrntrattoesate equal toorrifeaterManLtteSWSL
2. Bold coarrn4ations are equal to of g:eattr than the 15A h'CAC 2H Sttrdatd (for pH told t^!r'r.,t&& a mraciCmtY outer of the range).
3. Gotweatralform presented ki mkragtffins per trier (pq/L'�
4. 5Y4 ID is Me Send Waste Staten Idenngcatran Number.
S. RDL is the tabaawtit reporting [omit.
6. SASL is the Edlk1 Waste Section limn. HCOEQ defines the SWSL as the tawcst amount of ecvlsee N a samba that ran be que ivIlatNeCy deterrrr'ned
wbh s-iabla ruftwon and ecauacy.
7. Grerod vabres IrMIc -a values that ertal or ere greater 1Mn the S hSL
B. Quatr us In owic elltleed te,t art tabotatwy deco queflilcs Id Tow. 'U" Is used to wenttty stiffs not Cffnam et oe effluan tu; wt'tib equal the
Lfraratary% melitod d*Ldlon Urnk (HDL). P rs toot] to Idt% y e0meted conrenbatlwa whkh equd er are gew r that the HOL bd ate less than
the lebuetoris nreusrd repwttng Nmk (PA).
9. 5111 indictees Stcndu d 1latts.
10. R-fern ln6 ales mkfomhos per. centimeter.
11. HE Ifecales not esUlAislred.
12. AecordIng to the Corntltumt tmk•ap webpage on Hta NCOEQ Dtdslea of y139M_ IYlaragemGl[ r ebpr2-, Htere %no SWSL rarchimet asaochred
tehh CAS number IM87.03 6, wMin IsCA Ira S repa_ reported by the Mboratery fur MeaWlses mpitaed. Tkferar a era SWEL Ord a cos the chhtlde
t+t5tt CAS numbef SW301 as spedfed on tho Coovltuent loofrup webpe��.
13. Analkakal rea tto e6fataed from EleMwkc Data DelheraVa (EOD) provided by INA& Ef aq an May 17, 201r,
VIVUe Energy Pr0gtess.10261Q5XAW%17.2016 Well Samplag HonoTNWI IL2016 SOLID WASTE PBLHn REPOInXTabia 8 • Leacnate Flied and Andyncat
Ref'A'.xkx ftga i d 1

Attachment 4
Updated Sampling Point Aerial Photo
August 31, 2016 NPDES application update
Cape Fear Steam Electric Plant
NC0003433

Water Resources
ENVIRONMENTAL QUALITY
September 06, 2016
Paula J. Sims, Vice President
Duke Energy Carolinas LLC
PO Box 1551
Raleigh, NC 27602
PAT MCCRORY
Governor
DONALD R. VAN DER VAART
secretary
S. JAY ZIMMERMAN
Director
Subject: Additional Information for
Current Permit Renewal
Application No. NC0003433
Cape Fear Steam Electric Power Plant
Chatham County
Dear Ms: Sims:
The Water Quality Permitting Section acknowledges receipt of your permit application and
supporting documentation received on September 02,-2016. The primary reviewer for this renewal
application is Ron Berry.
The primary reviewer will review your application, and he will contact you if additional
information is required to complete your permit renewal. Per G.S. 150B-3 your current permit
does not expire until permit decision on the application is made. Continuation of the current permit
is contingent on timely and sufficient application for renewal of the current permit.
Please respond in a timely manner to requests for additional information necessary to
complete the permit application. If you have any additional questions concerning renewal of the
subject permit, please contact Ron Berry at 919-807-6389 or [e-mail].
cc: Central Files
NPDES
Raleigh Regional Office
Sincerely,
?Am %le id
Wren Thedford
Wastewater Branch
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919-807-6300

I Cape Fear
AK
........ .......
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