NC0003417_Application_20190607 (4)

(� DUKE
ENERGY.
August 31, 2016
Ms. Julie Grzyb
North Carolina Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: NPDES Wastewater Permit Application Submittal
Duke Energy Progress, LLC.
HF Lee Energy Complex
Permit #: NC0003417
Wayne County
Dear Ms. Grzyb,
Harry K. Sideris
Senior Vice President
Environmental, Health & Safety
526 S. Church Street
Mail Code: EC3XA
Charlotte, NC 28202
[phone]
Duke Energy Progress, LLC (Duke) is submitting herewith three copies of supplemental
information in support of the NPDES renewal application submitted in November 2012 for the
subject facility. This update is in addition to the previous updates and requests submitted dated
October 31, 2014, March 11, 2015 (Form 2C update for Outfal1002), March 11, 2015 (ash basin
dewatering update), and May 2, 2016. Please include this supplemental information and the
information in the previous submittals in 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.
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. As there are no requests for
new external outfalls to waters of the United States and all 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 HF Lee Energy Complex. This is 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.

HF Lee Energy Complex NPDES application update
NCO0034 l 7
Wayne County
Page 2 of 2
1. Option for wastewater currently routed to Outfall 003 for discharge to the
Neuse River to have the option to be discharged to the Cooling Pond
Duke intends to construct new piping to allow for discharge from the collection
sump at the new Lee Combined Cycle Plant to discharge from either outfall
Outfall 003, (which it is currently permitted to discharge, will be seldom used) or
to the cooling pond and thus to Outfall 002. An updated Form 2C, Water flow
diagram, flow descriptions and narrative are attached for your review. Estimated
analytical data for the discharge from the collection sump was submitted in the
November 19, 2012 permit application.
2. Option for treated landfill leachate to be routed to Outfall 001 should the
option of 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.
3. Area of wetness (AOW) Permit coverage Disposition
Duke has evaluated the list of AOW's submitted to the DEQ for permit coverage.
Based upon further review, Duke withdraws the request for coverage from the
area previously identified at S-01, 5-02, 5-03, S-03A, as these were sampling
points that have no seepage flow associated with them. Duke also withdraws
the request for coverage from the previously identified AOW's S-05, 5-19, S-
20 and S-21 as these were previously sampled and have no seepage associated
with them. 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. Several of these
points were simply monitoring points along a channel with no seepage detected at
the monitoring point. Duke requests that DEQ provide concurrence or
acknowledgement of this request in the NPDES Fact Sheet for the permit.
Duke requests that permit coverage for AOW's identified as LOLA -01 and
LOLA -01A be combined in the same effluent channel with a single
monitoring point at LOLA-01A. Duke also requested that newly identified
seeps S-27 and 5-28 be combined in the same effluent channel with a single
monitoring point at 5-28. In addition Duke requests permit coverage for

HF Lee Energy Complex NPDES application update
NCO003417
Wayne County
Page 3 of 3
AOW's identified as S-06, S-07, S-08, and S-09 be combined in the same
effluent channel with a single monitoring point at S-09. All of these points
commingle in an effluent channel east of the ash basin dam and discharge to
the Neuse River at the point identified as S-09. These seeps are currently
being routed back to the ash basin through a seepage collection system.
Similarly, Duke requests that permit coverage for AOW's identified as S-04
and S-26 be combined in the same effluent channel with a single monitoring
point at S-26. Duke requests that DEQ provide concurrence or
acknowledgement of this request in the NPDES Fact Sheet for the permit.
4. CWA Section 316(b) alternate schedule. Duke requests an alternate schedule
for compliance with Section 316(b) of the CIean Water Act. Specifics of the
request can be found in Attachment 3.
5. Duke intends to construct a groundwater extraction well system east of the
1982 ash basin.
The extraction well system is needed to remediate groundwater in the area of the
ash basin, it is expected to discharge up to 1.8 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 001. This
treatment system may require the addition of a coagulant and/or flocculent to
enhance solids removal. Attached are groundwater monitoring data and expected
flows from the extraction well system.
6. Duke intends to install a wastewater treatment system to treat ash basin bulk
water and interstitial water within the 1982 ash basin.
The treatment system for Outfall 001 will be installed on a constructed pad within
the basin with a similar flow path to the permitted outfall. Duke requests that
this flow be listed as a contributing flow to Outfall 001. Additional treatment
of the for the dewatering process may be completed via chemical and/or physical
processes prior to discharge to Outfall 001. 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. An updated sampling point aerial photograph is provided in
Attachment 5.

HF Lee Energy Complex NPDES application update
NC0003417
Wayne County
Page 4 of 4
We appreciate your attention to these requests and look forward to finalizing the NPDES permit
for the HF Lee Energy Complex in the near future. Should you have any questions regarding
this letter or require additional information, please contact Mr. Steve Cahoon at [phone]
or at [e-mail].
"! certify, under penalty of law, that this document and all attachments were prepared tender my direction
or supervision in accordance with a systent designed to assure that qualified personnel properly gather and
evaluate rite information submitted Based on my inquiry of the person or persons who manage rite systent,
or those persons directly responsible for gathering the information, the information submitted is, to the best
of eny knowledge and belief, trite, accurate, and complete. ! ant aware that there are significant penalties
for submitting false information, including the possibility of fines and intprisonnient for knowing
violations. "
Sincerely,
Harry Sideris
SVP - Environmental, Health & Safety
Enclosures
Duke Energy cc: Jeff Hines, Steve Cahoon, Mike Graham, Austin Mack, Cedric Fairbanks

Attachment 1
Revised Form 2C, flow diagram and descriptions
NPDES Permit Narrative, and Revised Chemical
List
HF Lee Energy Complex NPDES permit
Application update
August 31, 2016
NC0003417

EPA I.D. NUMBER (ralmfnnn Item I of Form 1) Form Approved.
NCI3000830661 OMB No 204"086.
Please print or type in the unshaded areas only. Aooroval exoires 3-31-98
FORM U.S. ENVIRONMENTAL PROTECTION AGENCY
FOR PERMIT TO DISCHARGE WASTEWATER
2C vEPA EXISTING MANUFACTURING,uCOMMERCIAL, MINING AND SILVICULTURE OPERATIONS
NPOES Consolidated Permits Program
I. OUTFALL LOCATION
For each outfall, list the latitude and longitude of its location to the nearest 15 seconds and the name of the receiving water
A. OUTFALL NUMBER
On)
S. LATITUDE
C. LONGITUDE
D RECEIVING WATER (name)
1 DEG.
2. MIN.
3. SEC.
1 DEG.
2. MIN.
3. SEC,
001
35
22
16
78
04
09
Neuse River
002
35
22
09
78
05
06
Neuse River
003
35
22
02
78
04
60
Neuse River
11, 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 ouHall, 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. (less)
a. OPERATION (iist)
b. AVERAGE FLOW
(include units)
a. DESCRIPTION
b. LIST CODES FROM
TABLE 2C-1
001
Ash pond discharge
2.5 MGD tbistoric flows)
Discharge to surface waters
4.A
Ash Transport waters
0 MM
Sedimentation, neutralization
1.0
2 K
Precip.6 air preheater wash water
0 map
Sedimentation, neutralization
1•U
2 K
Filter Plant Wastewater
0 MGD
SedimenCation. neutralization
1-U
2 K
Wayne County site Wastewaters
0 MGD
Sedimentation, neutralization
1-U
2 K
Miscellaneous Waste
a MGp
Sedimentation
1-U
treated bulklinteratital ash basin
Eat. 0.8 MUD {future)
water
treated Landfill LeaChaCe
Eat. 0,01.0.1 MGD (future)
Treated extracted Ground water
Eat. 0.9 MGD (future)
002
cooling pond discharge
0.00 mgd•
discharge to surface waters
4 A
recirc. condenser cooling water
369 Mon
Evaporation, recycle
1 P
4
Coal Pile runoff
0.02 ihiatorici
Sedimentation, neutralization
1 U
2-K
sewage treatment system
0.004 MGb
Anaerobic treatment, sand filtration
3 C
1-V
Low Volume Waste water
0.07 11GA
Sedimentation, neutralisation
1 U
2.K
combined cycle plant processes
133 CAN eat
Evapoation, discharge to surface waters
1 P
4-A
003
combined cycle plant processes
133 gpm avg eat
Evaporation, discharge to surface waters
1 F
4 A
003 OY
Filter plant wastewater
15 gpm avg eat
002
equipment and containment drains
70 gpm avg eat
RQ reject and filter backwash
25 gpm avg eat
Quenched MG alcwdown
23 gpm avg eat
OFFICIAL USE ONLY (effluent Auideline..urh-cnrege)rirs)
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 (camplerr rhefothitring tahle) m NO (tat ra.tiec+rnu 11f)
3. FREQUENCY
4 FLOW
a. DAYS PER
8 TOTAL VOLUME
2.OPERATtON(s)
WEEK
b. MONTHS
a. FLOW RATE (inmx4
srrr{f3-.ahnmr.;
1 OUTFALL
NUMBER (list)
CONTRIBUTING FLOW
(list)
(srrceh•
mrnw)
PER YEAR
(srec+h mrmrrr)
`- DURAT!CN
(:nday-
1 LONGTERM
2 MAXIMUM
1 LONGTERM
2 MAXIMUM
AVERAGE
DAILY
AVERAGE
DA LY
i
002
discharge from cooling p=nd is rare.
0
0
These occurrences may be caused by
extreme Strom events.
III PRODUCTION
A. Does an effluent guideline limitation promulgated by EPA under Section 304 of the Clean Water Act apply to your facility?
® YES (complelc Them 111-8) ❑ NO (Sro rn Smaan 111)
B. Are the limitations in the applicable effluent guideline expressed in terms of production (orother measure of operation)?
❑ YES (compte+e Item 111-0 ® NO (stir to,kruan 1[I
C If you answered'yes to Item III-6, 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 OUTFALLS
(fist nutfall numbers)
a. QUANTITY PER DAY
b. UNITS OF MEASURE
c. OPERATION, PRODUCT, MATERIAL, ETC
(.speeds')
N/A
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 tenets stipulations, Court orders, and grant or loan conditions
YES ❑ NO (W, fir hem 11 -11)
1 IDENTIFICATION OF CONDITION,
2- AFFECTED OUTFALLS
3, BRIEF DESCRIPTION OF PROJECT
4 FINAL COMPLIANCE DATE
AGREEMENT, ETC,
a. NO
b. SOURCE OF DISCHARGE
a, REQUIRED
b PROJECTED
Selenium compliance
001
ash pond
retire coal units
nitrogen compliance
001
ash p-nd
retire coal units
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 (8-90) PAGE 2 of 4 CONTINUE ON PAGE 3

EPA I.D. NUMBER (copyfhmmItem I rfl•orm 1)
CONTINUED FROM PAGE NCD000830661
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
0. 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 aulfall 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?
® YES (list all such prrllutams helow ) ❑
NO {4ro ru Hcm VI•H)
The following substances may be present in coal:
Antimony
Arsenic
Beryllium
Cadmium
Chromium
Copper
Lead
Mercury
Nickel
Selenium
Silver
Thallium
Zinc
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 (ldent fi- the test(s) anddewrihe rheirpurpuses below) ❑ NO (g,, w Seniors vill)
Outfall 001 - Quarterly acute toxicity testing, all testing has been passed during this permit cycle.
OUtfall 002 there has been no discharge since approximately 1998. No tox tests have been conducted.
VIII CONTRACT ANALYSIS INFORMATION
Were any of the analyses reported in Item V performed by a contract laboratory or consulting firm?
❑ YES (hv the Warn, address. and telephone numher ref and prrlluianu anal):ed ki ❑ NO (yqr rn .Acrinn 1,11
twch such lahnrahr{l fir firm hdow)
A. NAME
B ADDRESS
C. TELEPHONE
D POLLUTANTS ANALYZED
(anw nude R• na.)
(fist)
IX CERTIFICATION
l terrify 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 property 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 theta
are significant penaldas for submitting false information including the possibility of One and imprisonment for knowing violations.
A. NAME & OFFICIAL TITLE (tjyte or print)
B. PHONE NO. (anw rude d- no.)
Harry K. Sideris, SVP Envirmental, Health and Safety
004j 382-4303
C SIGNATURE t
D DATE SIGNED
08/31/2016
EPA Form 3510-2C (8-90) PAGE 4 of 4

Duke Energy Progress, Inc.
Attachment 3. Water Flow Line Drawing
HX Lee Energy Complex
Collection Tanks
Wayne Co CT Site
and Drain Tanks
Plant Processes
Collection Sump
Fw
A.O. Reject
Wayne Cc CT Site
RO S stem
Lee CC
K
Plant
Processes
P
K
V
F
HRSC blowdown to
Cooling paud
Neuse River
X
Outfnll 003 or cooling pond
7Nc'w Collection SumpOutfall
002
p 7
Y Filter Cake
Filter Press
Domestic Waste &
Potable Water Drains:::: FLceDomc-slicResiduals sent off site
sludge
Water Treatment
K
Evaporation
& Seepage
l
\ ' I
Oil Water
Separator
(Sludge)
H. F. Lee Energy Complex
NC0003417
Off -site H
ResidualsDisposal from
Retention
Olher Low Volume
Wastes
CT Site secondary
containment and fuel
forwarding area SW
Oil Water
� Separator
(sludge) Z Landfill leachale
Storage Dnk5
tiuMfema W W+uexma Trca�mrn� Sludge
GW extraction
AA"r iwoffsite disposal
miA"idmLKtnx malty nlrcn. irn
wells stem �,d-1a rc�c+rc 1—. L files fr
.unx".u�mene.yiW- Z,PA,B
BB CC z Am
NF fe.,'sc Ri�11]
Ash pond tfall
J Evaporation and
seepage
Neuse River
Outffall 002
M I
Y U Ncusc River
A
HRSC
blowdown Cooling Pond $
River Make-up Intake
R.O.
Cleaning
E
Y
Cooling water intake N Condenser.,
August 20113 Page A3-1

Duke Energy Progress, Inc.
Attachment 3
H. F. Lee Energy Complex
Stream
Estimated Average Flow
(New Lee Combined
cycle site
Comments
A
12.7 MGD'
Make-up water from Neuse River
Make-up water to cooling pond
B
12.7 MGD
D
453 MGD
Circulating Water withdrawal from cooling pond
E
453 MGD
Condenser cooling water return
F
-
Lee Combined Cycle Plant Site wastewaters from
oil/water separator (existing)
Cooling pond evaporation & seepage (estimated)
I
11.3 MGD'
J
0.004 MGD
Existing Lee site Sewage treatment system
K
0.43 MGD
Treated water to reverse osmosis system and plant
processes
M
Rare Occurrence
Cooling pond discharge to Neuse River (Outfall 002)
N
453 MGD
Condenser cooling water supply
P
Wayne County CT Site wastewaters from sump lift station
Q
2,400 gal/event
Collection and drains Tank
Qnew
2,400 gal/event
0.048 MGD
New Wayne County CC Site wastewaters from oil/water
separator (for new Combined cycle)
R
Wastewater from filter plant, recirculated back to clarifier
Raw water to filter plant (cycle makeup)
New WCT CC plant process drains
R.O reject stream
U
0.48 MGD
V
0.168 MGD
0.036
W
X
0.3MGD avg. (est.)
Outfall 003 to Neuse river
Y
0.3MGD avg. (est.)
Outfall 003 wastewater flows to cooling pond
Z
0.01 — 0.1
Est landfill Leachate flow to treatment system
AA
1.8 MGD
Est GW extraction well flow to treatment system
BB
0.8 MGD
Bulk/interstrial ash pond water to treatment system
CC
0.3 MGD
Recirculated flow from treatment system to ash pond,
8/31 /2016

Duke Energy Progress, Inc.
H. F. Lee Energy Complex
stortnwater
Z,AA,BB 1.8 MGD Est, flow from treatment system to Outfall 001
Nole: "MUD" = Million Gallons per Day
1. Makeup from the Neuse River to the cooling pond varies throughout the year. Makeup volumes will equate to
losses from evaporation and seepage to maintain lake level.
8/31 /2016

Duke Energy Progress Inc. W.F. Lee Energy Complex
NPDES Permit Number NCO003417
Attachment_ 4. Description of Operations Contributina to Wastewaters at OutfalI 001, Outfall
002 and Outfall 003
The H.F Lee Energy Complex has retired and demolished three coal-fired generating units and four
simple cycle combustion turbines. Commercial operation of the site's newly constructed 3 X 1
combined cycle electric generation block began on December 31, 2012. The site now consists of five
(5) simple cycle combustion turbines and the combined cycle unit. Total electric generation capacity
for the site is over 1800 Megawatts.
The site will continue to utilize the existing 545 acre off -stream closed -cycle cooling pond for
condenser cooling and process water. Water is withdrawn from the Neuse River, as required, to make
up evaporative, seepage, and discharge losses from the cooling pond. Makeup pumping rates are
highly variable depending upon natural weather conditions, generation load and plant operations,
quantity of water available in the river, and pond water levels. The maximum normal operating level
of the cooling pond is maintained at a safe level below the crest of the spillway gates. Discharges from
the cooling pond are rarely made, usually only during an extremely heavy rainfall event or a hurricane.
The cooling pond last discharged in 1998. Chemical constituents contained in the cooling pond
discharge are, for the most part, representative of the naturally -occurring chemical quality and quantity
of the intake water.
Upon retirement of the coal fired units, waste streams from processes which historically went to the
ash pond or the cooling pond will either no longer be generated or will be redirected to new outfall 003
to the Neuse River. More detail on these specific wastestreams is provided below.
In addition to the permitted outfalls, backwash from intake screening devices may be discharged into
the Neuse River bypass canal associated with the Neuse River pursuant to NCAC 15A 2H .0106 (f)
(2)•
The combined cycle plant utilizes water from the 545 acre off -stream cooling pond as its source for
fire water. Infrequently, flushing and testing of the fire system may result in releases of the fire water.
The following is a description of wastewater streams that will be reflective of the new H.F Lee Energy
Complex:
Contributing Flows into the Ash Pond (NPDES outfall 001)
The coal plant has been retired and no routine flows associated with coal fired generation are sent to
the ash pond. Wastestreams from closure activities associated with the coal fired unit may still be sent
to the ash pond until closure is complete. Duke Energy Progress, Inc. wishes to maintain outfall 001 as
an active outfall to ensure permitted coverage of any incidental discharges which may occur associated
with heavy rainfall events and to facilitate any needed groundwater remediation and dewatering for
future closure of the wastewater treatment. Wastestreams that have been historically sent to the ash
pond include:
Ash Transport System Wastewater
Fly ash and bottom ash from all three coal fired units were hydraulically conveyed by ash sluice
pipelines to the Lee Plant ash pond. (Ceased)
A4-1 8/31 /2016

Duke Energy Progress Inc. H.F. Lee Energy Complex
NPDES Permit Number NCO003417
Precipitator and Air Pre -heater Wash Water
Water from washing the interior of the precipitators and air heaters is typically routed to the ash pond
via the ash transport system but could be routed directly or indirectly to the cooling pond. The
wastewater from the Rotamix treatment system added to Unit 3 for NOx removal is also routed to the
ash pond. (Ceased)
Filter Plant Wastewater
Blowdown and filter backwash wastewater generated in the filter plant is discharged into the ash sluice
transport system which flows to the ash pond. (To be redirected to outfall 003, recirculated or directed
to Outfall 002)
Wayne County Combustion Turbine Site Wastewaters
The containments around the accessory module, liquid fuel, and atomizing air modules and the wash
water drain empty into collection tanks. Once there is a quantity of liquid collected in the tanks, the
wastewater is removed by pumper truck and transported offsite. The wash water drain tanks collect
the water and detergent used to clean the CT compressors. (To be redirected to outfall 003, Outfall 002
or disposed of offshe after ash pond closure)
Miscellaneous Wastes
Cooling tower basin sludge, circulating water tunnel sediment, and boiler vacuuming sediments are
sent to the ash pond. Other residuals from the low volume wastes retention basin and the coal pile
runoff retention basin and other miscellaneous low volume wastes from plant processes are also
transported to the ash pond. Storm water from the ash line trench flows into the ash pond. There may
be seepage in the vicinity of the ash pond. Some seeps may be seasonal.
Bulk water decanting/Interstitial Dewatering
Bulk and interstitial ash basin water will be decantedldewatered from the 1982 ash pond through
Outfall 001. Additional wastewater equipment will be brought onsite to assist in the bulk and
interstitial decanti ng/de watering. 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.
Landfill Leachate
In the future, Duke Energy plans to discharge wastewater from an onsite coal ash landfill. Landfill
leachate from the lined Iandfill will be collected in two 500,000 gallon tanks and routed to the WTS for
additional treatment and discharge through Outfall 001. Non contact stormwater will be collected in
A4-2 8/31/2016

Duke Energy Progress Inc. W.F. Lee Energy Complex
NPDES Permit Number NC0003417
retention ponds and permitted initially as construction stormwater under the NC construction general
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.
Groundwater Extraction Well System
Duke Energy is currently designing an extraction well system to provide accelerated groundwater
remediation. The groundwater will be treated prior to discharge through outfall 001. Treatment of the
discharge may be provided by introducing the groundwater as a waste stream to the ash ponds (for
treatment through the WTS), direct treatment through the WTS, or direct treatment through a dedicated
groundwater treatment system.
Contributing Flows into the Cooling Pond Closed Cycle) NPDES outfall 002
Re -circulated Condenser Cooling Water
This flow will provide condenser cooling water for the 3x I combined cycle generation units. The total
flow is re -circulated into the 545 acre pond from the condensers, routed through the pond by baffle
dikes to achieve maximum surface cooling efficiency before reaching the condenser cooling water
intake to be again introduced to the condensers for cooling. Cooling of the recirculated water in the
pond is achieved primarily by evaporation from the pond surface, which is estimated to consume
approximately 3-5 MGD above natural evaporation rates during times the units are in full operation.
Some flows from stormwater drains on the Lee plant site will still be directed to the cooling pond.
Sewage Treatment System (limited use)
Domestic waste is treated in a septic tank and sand filter bed system. Flow from the system is
dependent upon fluctuating demand due to variations in the number of personnel on site. Residuals are
disposed of off -site by a licensed contract disposal firm. The sand in the system is periodically changed
to ensure system effectiveness is maintained. The spent sand is disinfected and disposed of in a
landfill.
Coal Pile Runoff
Until the coal pile is completely removed, runoff will still be directed to the cooling pond. The coal
pile area is surrounded by a drainage ditch that is routed to a clay -bottomed, asphalt and concrete -sided
settling basin. The settling basin is sized so as to adequately store runoff and allow suspended solids to
settle before the supernatant is discharged by overflow to the cooling pond. During routine
maintenance of the basin, any solids removed will be disposed of in the active ash pond. (Ceased)
Other
During routine maintenance, the water treatment plant clarifier may be drained to the cooling pond to
allow for inspection of the clarifier. This activity typically occurs annually but may occur more frequently.
Additionally, should the filter press not be operational, clarifier solids may temporarily be directed to the
wastewater cooling pond for a short duration until the filter press can be repaired. This is expected to be
infrequent and will not be a routine operating mode.
Wastewater associated with the cleaning the plant process reverse osmosis process unit will be taken
A4-3 813112016

Duke Energy Progress Inc. H.F. Lee Energy Complex
NPDES Permit Number NC0003417
offsite or directed to the cooling pond. If directed to the cooling pond an antifoam chemical may be added
to the wastewater.
A blowdown stream from the combined cycle Heat Recovery Steam Generator is directed to the cooling
pond.
In the near future the Lee Plant plans to construct piping to allow for all of the flows listed below which
contribute to Outfall 003 to be discharged into the cooling pond. Including filter plant wastewater and
existing Wayne County Combustion Turbine Site Wastewaters, which are described below.
Filter Plant Wastewater
Existing water treatment plant clarifier blow down and filter backwash wastewater generated in the
filter plant was previously discharged into the ash sluice transport system and to the ash pond. Filter
backwash and clarifier alum solids will be treated via a gravity thickener and filter press. Filtrate from
the filter press was previously commingled with other waste streams and directed to outfall 003. This
flow has been rerouted and is now back to the water treatment plant clarifier. Solids from the filter
press will be disposed of at an offsite location, or on rare occasion in the cooling pond.
Existing Wayne County Combustion Turbine Site Wastewaters
Water from the cooling pond passes through a clarifier, dual media sand filters and then through a five -
micron cartridge pre -filter before entering either of two reverse osmosis (RO) units. The two RO units
may be operated in parallel or series depending on operational needs. The treated water is stored in a
tank until needed. Reject wastewater from the reverse osmosis process is sent to a sump where it will
be routed to either the cooling pond (outfall 002) or outfall 003.
In addition to the RO reject wastewater, excess evaporative cooling water, process drains, and waters
from the oil water separator will be routed to the cooling pond (outfall 002) or routed to outfall 003.
Historically, the containments around the accessory module, liquid fuel, and atomizing air modules
empty into collection tanks. Once there is a quantity of liquid collected in the tanks, the wastewater is
removed by pumper truck and transported and released into the Lee Plant ash pond. There is also a
drain tank that collects the water and detergent used to clean the CT compressors. All of these
wastewaters will be either pumped and hauled offsite or redirected to the cooling pond (outfall 002) or
outfall 003 after the ash pond is no longer used.
An oil water separator treats storm water from the containment areas around the facility's fuel oil
storage tanks, the fuel forwarding pumps, and the fuel oil unloading area. Water from the oil water
separator will be conveyed to the new collection sump and routed to outfall 003, or the cooling pond
(outfall 002). Storm water collection containment areas around transformers and substations are
examined for the presence of any oily substance; if oily substances are not present in the water, the
water is drained to the ground. If oily substances are present nothing will be drained from the
containments until that substance is properly removed.
Outfall 003 will also contain a blowdown stream from the wet surface air cooler (WSAC).
Wastewaters from routine cleaning, fuel oil/water condensate, false start materials, equipment drains
containing potential oil, and compressor wash water may be routed to outfall 003. Any of these waters
with a potential for containing oil are routed through the oil water separator before being sent to outfall
003. Incidental leaks associated with the routine operation of the combustion turbine heat recovery
A4-4 8/31 /2016

Duke Energy Progress Inc. H.F. Lee Energy Complex
NPDES Permit Number NC0003417
steam generator may occur and get to the ground surface. Other infrequent draining and cleaning of
various process units during operation and maintenance activities may generate wastewater that will be
routed to outfall 003. These wastewaters may also be routed to the cooling pond (outfall 002).
Contributln flows to Outfa11003
Filter Plant Wastewater
Existing water treatment plant clarifier blow down and filter backwash wastewater generated in the
filter plant was previously discharged into the ash sluice transport system and to the ash pond. Filter
backwash and clarifier alum solids will be treated via a gravity thickener and filter press. Filtrate from
the filter press was previously commingled with other waste streams and directed to outfall 003. This
flow has been rerouted and is now back to the water treatment plant clarifier. Solids from the filter
press will be disposed of at an offsite location, or on rare occasion in the cooling pond.
Existing Wayne County Combustion Turbine Site Wastewaters
Water from the cooling pond passes through a clarifier, dual media sand filters and then through a five -
micron cartridge pre -filter before entering either of two reverse osmosis (RO) units. The two RO units
may be operated in parallel or series depending on operational needs. The treated water is stored in a
tank until needed. Reject wastewater from the reverse osmosis process is sent to a sump where it will
be routed to either the cooling pond (outfall 002) or outfall 003.
In addition to the RO reject wastewater, excess evaporative cooling water, process drains, and waters
from the oil water separator will be routed to the cooling pond (outfall 002) or routed to outfall 003.
Historically, the containments around the accessory module, liquid fuel, and atomizing air modules
empty into collection tanks. Once there is a quantity of liquid collected in the tanks, the wastewater is
removed by pumper truck and transported and released into the Lee Plant ash pond. There is also a
drain tank that collects the water and detergent used to clean the CT compressors. All of these
wastewaters will be either pumped and hauled offsite or redirected to the cooling pond (outfall 002) or
outfa11003 after the ash pond is no longer used.
An oil water separator treats storm water from the containment areas around the facility's fuel oil
storage tanks, the fuel forwarding pumps, and the fuel oil unloading area. Water from the oil water
separator will be conveyed to the new collection sump and routed to outfall 003, or the cooling pond
(outfall 002). Storm water collection containment areas around transformers and substations are
examined for the presence of any oily substance; if oily substances are not present in the water, the
water is drained to the ground. If oily substances are present nothing will be drained from the
containments until that substance is properly removed.
Outfall 003 will also contain a blowdown stream from the wet surface air cooler (WSAC).
Wastewaters from routine cleaning, fuel oil/water condensate, false start materials, equipment drains
containing potential oil, and compressor wash water may be routed to outfall 003. Any of these waters
with a potential for containing oil are routed through the oil water separator before being sent to outfall
003. Incidental leaks associated with the routine operation of the combustion turbine heat recovery
steam generator may occur and get to the ground surface. Other infrequent draining and cleaning of
various process units during operation and maintenance activities may generate wastewater that will be
routed to outfall 003. These wastewaters may also be routed to the cooling pond (outfall 002).
A4-5 8/31/2016

H. F. Lee Energy Complex
Duke Energy Progress, Inc. NPDES Permit Number NC0003417
Attachment S. Potential Discharges Not Covered By Analysis
Estimated
Quantity
(used per
Chemical
ear)
Frequency
Purpose
NALCO Stabrex ST-70
800 gal
As required
Wet Surface Air Cooler biocide
NALCO 3D Trasar 3DT189
300 gal
As required
Wet Surface Air Cooler corrosion
control
NALCO BT 3000
150 lb
As needed
Boiler corrosion inhibitor
Ammonium Hydroxide (19%)
1,200 gal
As required
Boiler condensate pH control
NALCO Y302939.52
Sodium hypochlorite, 10-16%
34,000 gal
As required
Raw water biocide
Winter alum liquid
36,000 gal
As required
Raw water treatment
Caustic, 25% tech grade
21,000 gal
Continuous
Raw water pH control
Caustic, 50% tech grade
12,000 gal
Continuous
Ash pond pH control
Soda Ash
4,000 lb
As required
Ash pond pH control
Connect 6000
280 gal
As required
Wayne County Combustion
Turbine Site Turbine compressor
cleaning
NALCO PC-77
110 gal
As required
Wayne County Combustion
Turbine Site RO System
membrane low pH cleaner
NALCO PC 98
400 gal
As required
Wayne County Combustion
Turbine Site RO System
membrane high pH cleaner
NALCO PermaTreat PC-191
220 gal
Continuous
Wayne County Combustion
Turbine Site RO System
antiscalant
NALCO 7408 (sodium bisulfite)
880 gal
As needed
Various water stream
dechlorination
NALCO PC 11
variable
As required
Biocide for Reverse osmosis
system
Miscellaneous laboratory solutions
2 gal
As required
Wayne County Combustion
and reagents
Turbine Site RO water testing
Nalco 7465
< 1 gallon
As required
Foam Control
Nalco 7468
< I gallon
As required
Foam Control
Sulfuric Acid
As required
pH adjustment of ash basin
A5-1 August, 2016

H. F. Lee Energy Complex
Duke Energy Progress, Inc. NPDES Permit Number NCO003417
discharge
Acetic Acid
As required
pH adjustment of ash basin
discharge
Citric Acid
As required
pH adjustment of ash basin
As required
discharge
pH adjustment of ash basin
Hydrochloric acid
discharge
As required
pH adjustment of ash basin
Alum
discharge
As required
pH adjustment of ash basin
C011
discharge
Ash Pond Water Wastewater Treatment System
Chlorine Dioxide
< 500
As needed
Biofouling control
gallons
Sulfuric Acid (98%)
< 500
As needed
Membrane cleaning
allons
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
A5-2 August, 2016

Attachment 2
Future Condition HF Lee CCP Landfill
Data Comparison Untreated Mayo CCP Landfill
leachate data
HF Lee Energy Complex NPDES permit
Application update
August 31, 2016
NC0003417

TABLE 8
LEACHATE FIELD AND ANALYTICAL RESULTS
MAYO CCP LANDFILL PHASE 1- PERMIT NO.7305
MAYO STEAM ELECTRIC PLANT
DUKE ENERGY PROGRESS, LLC, ROXBORO, NC
S&Yl* Dade: Aprg 6, 2016 Labormaty Cot?—aiz Codes
Sy OMS Cvrpwstk.+ FWd f SW
Rdd Swing paivtned by SynTerra Cnrpwww duke Bub AftWy kW Ltbwa=y
Parameter
SWS ID
Utee�s
[,_#ifiiGMz Code
L�
ROIL
SWSL
field pH
320
SU
5.591
7.9
NE
Specific Conductance
323
umho/crn
51591
305
NE
Temperature
325
"C
5,591
14
NE
Arsenic
14
pot.
248
14.7
1
10
Barium
15
41.
248
61
5
100
Boron
428
41.
248
1.270
50
NE
Cadmium
34
pglL
248
< 1
1
1
Chloride
455
µy/L
248
39 000
1 ON
NE
Chromium
51
poL
248
26
5
10
Capper
54
pVL
248
< 5
5
10
Fluoride
312
pot.
248
180
100
U00
1ron
340
pg/L
248
416
10
300
Lead
131
pg/L
248
< t
1
10
Manganese
342
pg/L
248
8
5
50
Mercury
132
pg/L
248
< 0 05
0.05
02
Nkiel
152
pg/L
248
34
5
50
Nitrate (as Nitrogen.
303
pg/L
248
630
23
10 000
Selenium
183
pg/L
248
1.7
1
10
Silver
184
pg/L
248
< 5
5
10
Sulfate
315
pg/L
248
130 000
2.000
250,000
Total Disso)ved Solids
311
pg/L
248
330,000
25,000
NE
Zinc
213
pg/L
248
204
5
10
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5. UL b Da MhE1& V "mm" Ltab.
L5WL%tMSWW1MS9iMMtknLbmEQ1dYieQ*SM5Lm*eboW&v dat- 'Iu. nsamomthnoebrjwr•.a[w,ieAmt.
ebb srtab I p,atYm ad aww"y.
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a t�..ta.,a M nr�aaraa ter an rrhsra+k! ere pis tr'nfpl 'u' z um4 fs IAwelry reaR1 eel ArcrGaE a< ep w as
Uhmm " artlre AR die Wet PWO. 'i r used to WOW* eMsbn cone WWMM rr,r, apwt � an plater I me bDL as ku Om
the h1wate" amgMd nowaw *rjt (MIL).
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rah CAS ftftw INP464..uai r tba CAS Iprrhet br Im Mbralrr fro the 800#= OW M EL rt.,drm tat SWSL Now as na am
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r IPt4 faeOY r++ tt�Ps MA10117. WM Wd & pm UwAMFWdwd&nordLa
pabe 1 d t

Attachment 3
Clean Water Act Section 316(b) Alternate Schedule
HF Lee Energy Complex NPDES permit
Application update
August 31, 2016
NC0003417

Alternate Schedule Request §316(b) of the Clean Water Act
H.F. Lee Combined Cycle Station
Final regulations to establish requirements for cooling water intake structures at existing facilities
were published in the Federal Register on August 15, 2014 (i.e. regulations implementing §316(b) of the
Clean Water Act) with an effective date of October 14, 2014. Per §125.91(a)(1)-(3) Applicability, the H.F.
Lee Combined -Cycle Station (Lee) is subject to the requirements at §125.94 through §125.99 (316(b)
requirements) based on the following:
— The facility is defined as an existing facility;
— The facility has a point source discharge;
— The facility uses a cooling water intake with a design intake flow (DIF) of greater than 2 million
gallons (MGD) to withdraw water from waters of the U.S.; and
— Twenty-five percent or more of the water withdraws on an actual intake flow basis are
exclusively used for cooling purposes.
Per §125.98(6) Permitting requirements, 316(b) requirements are implemented through the NPDES
permit. For Lee, the NPDES permit proceedings had begun prior to the effective date of the rule.
Therefore, 40 C.F.R §125.98(g) Ongoing permitting proceedings, applies, which states:
"... whenever the Director has determined that the information already submitted by the owner
or operator of the facility is sufficient, the Director may proceed with a determination of BTA
standards for impingement mortality and entrainment without requiring the owner or operator
of the facility to submit the information required in 40 CFR 122.21(r).."
Lee was not subject to the remanded 316(b) Phase II Rule because the station employs a closed -
cycle recirculation cooling water system by utilizing a cooling pond not designated as waters of the U.S.;
therefore, no information related to 316(b) has been previously submitted. As stated in the preamble to
the rule, "In such circumstances where permit proceedings have already begun prior to the effective
date of the rule, these facilities will still need to submit the appropriate permit application materials
found at § 122.21(r) permit applications during their next application."'
Furthermore, the regulation states the owner of a facility whose current effective permit expires
after July 14, 2018, must submit the above information when applying for a subsequent permit and the
owner of a facility whose current effective permit expires on or before July 14, 2018 may request an
alternate schedule for the submission of the above information. As allowed under ,§125.95(a)(2), Duke
Energy would like to request an alternate schedule for the submission of the applicable 316(b)
information for Lee. Per §122.21(r)(1)(ii), the following information must be submitted for all existing
facilities:
179 Fed. Reg. 48358 (15 August 2014)

§122.21(r)(2) Source Water Physical Data
§122.21(r)(3) Cooling Water Intake Structure Data
§122.21(r)(4) Source Water Baseline Biological Characterization Data
§122.21(r)(5) Cooling Water System Data
§122.21(r)(6) Chosen Method(s) of Compliance with Impingement Mortality Standard
§122.21(r)(7) Entrainment Performance Studies
§122.21(r)(8) Operational Status
As stated above, Lee employs a closed -cycle recirculating cooling water system by using a cooling pond
not designated as waters of the U.S. The station, however, does have a make-up intake on the Neuse
River with a DIF of approximately 35 MGD. With the DIF being significantly less than 125 MGD threshold,
the additional information requirements under §122.21(r)(1)(ii)(B) Existing facilities greater than 125
MGD A!F are not applicable to Lee.
Duke Energy is not planning on collecting any new biological data on the source water, or
conducting impingement or entrainment studies at the cooling water intake structure and has not been
requested to do so by North Carolina Department of Environmental Quality (NCDEQ). Existing biological
data from available sources will be used to complete §122.21(r)(2) Source Water Physical Data and
§122.21(r)(4) Source Water Baseline Biological Characterization Data. Furthermore, with the station
utilizing a cooling water impoundment not designated as waters of the U.S. and only requiring minimal
make-up from the Neuse River, Duke intends to demonstrate the existing technologies at Lee meet the
best technology available (BTA) standard for both impingement and entrainment mortality.

Attachment 4
Future condition HF Lee Extraction Well System
Groundwater Data
HF Lee NPDES permit Application update
August 31, 2016
NC0003417

HF Lee GW Well Data Summary
14 wells sampled form 2010-2016
Parameter
Units
Average results from 14 wells
2010-2016 sampling events
Aluminum
ug/L
297
Arsenic
ug/L
63.5
Cadmium
ug/L
0.8
Cobalt
ug/L
2.7
Copper
ug/L
4.1
Manganese
ug/L
209
Nickel
ug/L
4.2
N itrate
mg/L
0.2
Selenium
ug/L
2.7
Total Dissolved Solids
mg/L
231
Total Suspended Solids
mg/L
7.3
Zinc
ug/L
6.6
pH
Std. units
6.0

Attachment 5
Updated Sampling Point Aerial Photo
HF Lee NPDES permit Application update
August 31, 2016
NC0003417

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