NC0003433_additional information received_20200821

PUBLIC NOTICE
AFFP N.C. DEPARTMENT OF
PUBLIC NOTICE N.C. DEPARTMENT ENVIRONMENTAL
QUAL€TY INTENT TO ISSUE
NPDES WASTEWATER
Affidavit of Publication DISCHARGE PERMIT
#NCoo03433
Public comment or objec-
tion to the draft permit
STATE OF NORTH modification is invited.All
SS comments received by July
CAROLINA} 22,2020 will be considered
COUNTY OF } Lee_ in the final determination
regarding permit Issuance
Kimberly Cook, being duly sworn, says: and permit provisions.
That she is the billing clerk of the The Sanford Herald, a PERMIT APPLICATION
daily newspaper of general circulation, printed and Duke Energy Progress, LLC,
published in Sanford, County, North Carolina; that the 526 South Church St., Char-
publication, a copy of which is attached hereto,was lotte, N.C., has applied for
published in the said newspaper on the following dates: modification of its NPDES
wastewater permit
(NC0003433)for Cape Fear
June 20, 2020 Steam Electric Plant,500
CP&L Road, Moncure,
Chatham County.The facil-
ity discharges treated Indus-
trial wastewater and storm-
water to Cape Fear River
and Unnamed Tributaries to
Cape Fear River In the Cape
That said newspaper was regularly issued and circulated Fear River basin. Some of
on those dates. the parameters are water
SIGNED: quality limited.This dis-
charge may affect future al-
-1` () �r1C locations in this portion of
the Cape Fear River basin.
the billing clerk
Subscribed to and sworn to me this 20th day of June The draft wastewater permit
2020. modification and related
documents are available
online at:
https://goo.gi/3WtzMF.
Printed copies of the draft
ilaaa.w. rn ./2 permit and related docu-
Barbara M Daniels, Notary, Guilford, County, North ments may be reviewed at
Carolina the department's Raleigh
Regional Office.To make an
My commission expires: February 01, 2022 appointment to review the
documents,please call
919-707-3601.
Public comment on the draft
30153503 30907086 permit modification should
be mailed to:Wastewater
Wren Thedford Permitting, 1617 Mall
Division Of Water Resources Service Center, Raleigh,
1617 MAIL SERVICE CENTER °°° "''�t, N.C.,27699-1617.
RALEIGH, NC 27699-1617 .�`�;� '
; Public comments may also
,•'' 1 A61 he submitted by email to:
R Y pubiiccomments@
ncdenr.gov. Please be sure
AU B��C ,, to Include "Cape Fear"in
.' the email's subject line.

NAND
Powered by McClatchy
The News&Observer
421 Fayetteville Street,Suite 104
MEDIA COMPANY Raleigh,NC 27601
consult. strategize. deliver.
AFFIDAVIT OF PUBLICATION
Account# Ad Number Identification PO Cols Lines
104811 0004678071 DISCHARGE PERMIT#NC0003433 1 47
Attention: STATE OF NORTH CAROLINA
DEPARTMENT OF WATER RESOURCES COUNTY OF WAKE
1617 MAIL SERVICE CENTER Before the undersigned,a Notary Public of
RALEIGH, NC 276991617 Johnston County,North Carolina,duly
commissioned and authorized to administer
oaths,affirmations,etc.,personally appeared
PUBLIC NOTICE BETSY WOMBLE,who being duly sworn or
N.C.DEPARTMENT OF affirmed,according to law,doth depose and
ENVIRONMENTAL QUALITY INTENT
TO ISSUE NPDES WASTEWATER say that he or she is Accounts Receivable
DISCHARGE PERMIT#NC0003433
Public comment or objection to the draft Specialist of the News&Observer Publishing
permit modification is invited. All com-
ments received by July 22,2020 will be Company,a corporation organized and doing
considered in the final determination re-
garding permit issuance and permit pro- business under the Laws of the State of
visions.
PERMIT APPLICATION North Carolina,and publishing a newspaper
Duke Energy Progress, LLC,526 South known as The News&Observer,Wake
Church St.,Charlotte, N.C.,has applied
for modification of its NPDES wastewa- County and State aforesaid,the said
ter permit INC0003433) for Cape Fear
Steam Electric Plant, 500 CP&L Road, newspaper in which such notice,paper,
Moncure,Chatham County. The facility
discharges treated industrial wastewa- document,or legal advertisement was
ter and stormwater to Cape Fear River
and Unnamed Tributaries to Cape Fear published was,at the time of each and every
River in the Cape Fear River basin.
Some of the parameters are water quail- such publication,a newspaper meeting all of
ty limited.This discharge may affect fu-
ture allocations in this portion of the the requirements and qualifications of Section
Cape Fear River basin.
The draft wastewater permit modifica- 1-597 of the General Statutes of North
Lion and related documents are availa-
ble online at: https://goo.gl/3WtzMF. Carolina and was a qualified newspaper
Printed copies of the draft permit and
related documents may be reviewed at within the meaning of Section 1-597 of the
the f ce department's
make appointment gto Regional
General Statutes of North Carolina,and that
the documents,please call 919-707-3601. as such he or she makes this affidavit;and is
Public comment on the draft permit
modification should be mailed to: familiar with the books,files and business of
Wastewater Permitting, 1617 Mail Serv-
ice Center,Raleigh,N.C.,27699-1617. said corporation and by reference to the files
Public comments may also be submitted
by email to:Pubtjccommentsfncdenr.-, of said publication the attached advertisement
gov. Please be sure to include "Cape
Fear"in the email's subject line.
N&O:June 21,2020 1 Insertion(s)
Published On:
June 21,2020
fait/
BETSY WOMBLE,Accounts Receivable
Specialist
d.1 J )6,LA. Cal
Electronic Notary Public
State of North Carolina
Sworn to and subscribed before me this
22nd day of June,2020
My Commission Expires: 7/10/2023
WENDY DAWSON
�'� Notary Public
"It/, North Carolina
Johnston County

June 9,2020
MEMORANDUM
To: Shawn Guyer,Regional Engineer
NC DEQ /DWR/Public Water Supply Section
Raleigh Regional Office
From: Sergei Chernikov,Environmental Engineer III,Complex NPDES Unit,
Division of Water Resources ([e-mail])
Subject: Review of the discharge locations for the following Draft NPDES Major
Modification:
NC0003433 Cape Fear Steam Electric Plant
Chatham County
Please indicate below by July 10,2020 your agency's position or viewpoint on the facility listed
above.We cannot issue the permit without your concurrence. Please return this form at your
earliest convenience.
RESPONSE:
This agency has reviewed the draft permit and determined that the proposed
discharge will not be sufficiently dose to any existing or known proposed
public water supply intake so as to create an adverse effect on water quality.
We concur with the issuance of this permit provided the facility is operated
and maintained properly, the stated effluent limits are met prior to discharge,
and the discharge does not contravene the designated water quality standards.
Concurs with issuance of the above permit, provided the following conditions
are met:
Opposes the issuance of the above permit, based on reasons stated below, or
attached:
Signed Date: oa/id/2owp
cc: file

Fact Sheet
NPDES Permit No. NC0003433
Permit Writer/Email Contact: Sergei Chernikov, Ph.D., [e-mail]:
Date: May 27,2020
Division/Branch: NC Division of Water Resources/NPDES Complex Permitting
Fact Sheet Template:Version 09Jan2017
Permitting Action:
❑ Renewal
❑ Renewal with Expansion
❑ New Discharge
® Modification(Fact Sheet should be tailored to mod request)
Note: A complete application should include the following:
• For New Dischargers,EPA Form 2A or 2D requirements, Engineering Alternatives Analysis,Fee
• For Existing Dischargers(POTW),EPA Form 2A, 3 effluent pollutant scans, 4 2"a species WET
tests.
• For Existing Dischargers(Non-POTW),EPA Form 2C with correct analytical requirements based
on industry category.
Complete applicable sections below. If not applicable, enter NA.
1. Basic Facility Information
Facility Information
Applicant/Facility Name: Duke Energy Progress LLC-Cape Fear Steam Electric Plant
Applicant Address: 500 CP&L Road,Moncure,NC 27599
Facility Address: 500 CP&L Road,Moncure,NC 27599
Permitted Flow: Outfall 007-0.73 MGD Daily Maximum
Outfall 008 -0.72 MGD Daily Maximum
Outfall 009--0.005 MGD Daily Maximum
Facility Type/Waste: 100%Industrial(Ash basin clean up,remediation)
Facility Class: Grade I Physical Chemical WPCS
County: Chatham
Region Raleigh
Briefly describe the proposed permitting action and facility background: Duke Energy Progress LLC
(Permittee)has requested a permit modification and submitted a modification request on March 17,
2020.The permit is being modified to add an Emergency Spillway for the 1963/1970 inactive ash basin.
The new Emergency Spillway will be designated as Outfall 008B,it will be adjacent to Outfall 008A.
The monitoring will be waived due to unsafe conditions associated with sampling during an overflow
event.The location of new Outfall is described in Table 2.
Page 1 of 4

Table 2. Outfall 008B Location
Coordinates
Latitude:35°34'57.37"N
Longitude:-79°02'57.50"W
The new Emergency Spillway is needed to comply with the new Dam Safety regulations for ash basin
dams passed in April 2019.The current regulatory design storm has been updated from 0.5 Probable
Maximum Flood(PMF)to the full PMF.The full PMF equates to 27.5 inches of rainfall in 6-hour period.
In order to safely pass the full PMF a new auxiliary emergency overflow spillway is required to be
constructed to release stormwater to the Cape Fear River.
2. Receiving Waterbody Information:
Table 3.
Receiving Stream Index 7Q10s QA IWC
(cfs) (cfs) (7Q10s)
Outfall 007—Unnamed tributary to Cape Fear River 18-(1) 0 0 100%
Outfalls 008—Cape Fear River 18-(1) 65 3,170 1.7%
Outfall 009—Cape Fear River 18-(1) 65 3,170 0.012%
Outfall 008A—Cape Fear River
Outfalls 001 &005—Internal Outfalls _
Stream Classification: WS-IV Regional Office: Raleigh
303(d)Listed?: No USGS Topo Quad: E22SE Moncure,NC
HUC No.: 03030002 Permit Writer: Sergei Chernikov,Ph.D.
Subbasin: 03-06-07 Date: May 27, 2020
Cape Fear River Stream Statistics—2016
Drainage(mi2): -
Summer—7Q10(cfs): 65 ' Itht
Winter—7Q10(cfs): 89 1 - -
30Q2 (cfs): 150 '
QA(cfs): 3,170 '
1. Based on USGS recommendation and data
3. Instream Monitoring
Instream monitoring may be required in certain situations, for example: 1)to verify model predictions
when model results for instream DO are within 1 mg/1 of instream standard at full permitted flow; 2)to
verify model predictions for outfall diffuser; 3)to provide data for future TMDL;4)based on other
instream concerns. Instream monitoring may be conducted by the Permittee,and there are also
Monitoring Coalitions established in several basins that conduct instream sampling for the Permittee(in
which case instream monitoring is waived in the permit as long as coalition membership is maintained).
If applicable, summarize what instream monitoring will be proposed for this permit action: The current
permit requires instream monitoring for total arsenic,total selenium,total mercury,total chromium,
dissolved lead,dissolved cadmium,dissolved copper,dissolved zinc,total bromide,total hardness(as
CaCO3),temperature,turbidity,and total dissolved solids(TDS)at locations specified in Table 4:
Page 2 of 4

Instream sampling location descriptions are shown in Table 4.
Table 4.Instream Sampling Locations Description
Instream Sample Description Location
Upstream Outfall 008 0.9 miles upstream from Outfall 008A in Cape Fear River
Downstream Outfall 008 Approximately 250 meters downstream from Outfall 008 in
Cape Fear River
Is this facility a member of a Monitoring Coalition with waived instream monitoring(Y/N): NO
Name of Monitoring Coalition:NA
4. Antidegradation Review (New/Expanding Discharge):
The objective of an antidegradation review is to ensure that a new or increased pollutant loading will not
degrade water quality. Permitting actions for new or expanding discharges require an antidegradation
review in accordance with 15A NCAC 2B.0201. Each applicant for a new/expanding NPDES permit
must document an effort to consider non-discharge alternatives per 15A NCAC 2H.0105(c)(2). In all
cases, existing instream water uses and the level of water quality necessary to protect the existing use is
maintained and protected.
If applicable, describe the results of the antidegradation review, including the Engineering Alternatives
Analysis(EAA)and any water quality modeling results:NA
5. Antibacksliding Review:
Sections 402(o)(2)and 303(d)(4)of the CWA and federal regulations at 40 CFR 122.44(1)prohibit
backsliding of effluent limitations in NPDES permits. These provisions require effluent limitations in a
reissued permit to be as stringent as those in the previous permit,with some exceptions where limitations
may be relaxed(e.g.,based on new information,increases in production may warrant less stringent TBEL
limits, or WQBELs may be less stringent based on updated RPA or dilution).
Are any effluent limitations less stringent than previous permit(YES/NO): NO
If YES, confirm that antibacksliding provisions are not violated:NA
6.Summary of Proposed Permitting Actions:
A proposed new outfall 008B (emergency spillway)was added to the permit.
7. Public Notice Schedule:
Permit to Public Notice: 06/08/2020
Per 15A NCAC 2H.0109& .0111,The Division will receive comments for a period of 30 days following
the publication date of the public notice.Any request for a public hearing shall be submitted to the
Page 3 of 4

Director within the 30 days comment period indicating the interest of the party filing such request and the
reasons why a hearing is warranted.
8. Fact Sheet Addendum (if applicable):
Were there any changes made since the Draft Permit was public noticed(Yes/No):
If Yes, list changes and their basis below:
9. Fact Sheet Attachments (if applicable): NA
Page 4 of 4

v;r•
o
ROY COOPER -�
Governor *r;v °
MICHAEL S.REGAN
Secretary
S.DANIEL SMITH NORTH CAROLINA
Director Environmental Quality
June 9,2020
Mr. Paul Draovitch, Senior Vice President
Environmental, Health and Safety
Duke Energy Carolinas,LLC
Mail Code EC13K
P.O.Box 1006
Charlotte,North Carolina 28201-1006 •
Subject: Draft NPDES Permit Modification
Permit NC0003433
Cape Fear Steam Electric Plant
Chatham County
Grade I Physical Chemical WPCS
SIC 4911
Dear Mr. Draovitch:
Enclosed with this letter is a copy of the Draft NPDES permit modification for your facility. Please
review this draft modification carefully to ensure thorough understanding of the requirements and
conditions it contains.
The draft Major Modification contains the following significant changes from your current
permit:
• The new Emergency Spillway for the 1963/1970 inactive ash basin has been added to the
permit. The new Emergency Spillway will be designated as Outfall 008B [Lat: 35°34'57.37"N,
Long: 79°02'57.50"W].
The NPDES standard conditions (Parts II, III, and IV) that are a part of the permit modification are
not included in this draft document (cover, map, and Part I). The latest version is available at
htrps://bit.ly/2BZ4xxx and can be viewed online or downloaded as a PDF file.
Concurrent with this notification the Division is publishing a notice in a newspaper having circulation
in the general Chatham County area, soliciting public comments on this draft permit. Please provide
any written comments you may have to the following: NCDEQ/DWR,NPDES Permitting Branch,
1617 Mail Service Center,Raleigh,NC 27699-1617 no later than 30 days after receipt of this draft
permit.
D_E 5 North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh,North Carolina 27699-1617
NORM CAROUNA
Daportmal d Emil...Mel 919.707.9000

Following the 30-day public comment period, the Division will review all pertinent comments and
take appropriate action prior to issuing a final permit. If you have questions concerning this draft
permit,please call me at(919) 707-3606 or by email at [e-mail].
Sincerely,
Sergei Chernikov, Ph.D.
Environmental Engineer III
• Complex NPDES Permitting Unit
Hardcopy: NPDES Files
Ecopy: US EPA Region IV
DWR/Raleigh PWSS Regional Engineer
DWR/Aquatic Toxicology Branch
DWR/Raleigh Regional Office/Water Quality
DWR/Operator Certification Program

Permit NC0003433
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
Draft PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards and
regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the
Federal Water Pollution Control Act,as amended,
Duke Energy Progress LLC
is hereby authorized to discharge wastewater from a facility located at the
Cape Fear Steam Electric Power Plant
500 CP&L Road
Moncure
Chatham County
to receiving waters designated as an unnamed tributary to the Cape Fear River (Outfall 007) and to the
Cape Fear River (Outfalls 008, 008A, 008B, 009) in the Cape Fear River Basin in accordance with
applicable effluent limitations,monitoring requirements,and other applicable conditions set forth in Parts
I, II and III hereof.
This permit modification shall become effective
This permit and authorization to discharge shall expire at midnight on June 30, 2023.
Signed this day
S. Daniel Smith,Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 24

Permit NC0003433
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked, and as of this issuance, any previously issued permit bearing this number is no longer effective.
Therefore,the exclusive authority to operate and discharge from this facility arises under the permit
conditions,requirements, terms, and provisions included herein.
Duke Energy Progress LLC is hereby authorized to:
1. Operate the following modified systems located at the decommissioned Cape Fear Steam Electric
Power Plant at 500 CP&L Road near Moncure in Chatham County:
• 1978 Ash Basin (Internal Outfall 001).This outfall is designated as an emergency discharge
only and will consist of ash basin decanting wastewater. This is limited to discharging excess
wastewater above the available treatment plant capacity during an eminent threat of 1978 Ash
Basin overflow.
• 1985 Ash Basin (Internal Outfall 005).This outfall is designated as an emergency discharge
only and will consist of ash basin decanting wastewater. This is limited to discharging excess
wastewater above the available treatment plant capacity during an eminent threat of 1985 Ash
Basin overflow.
• Combined Wastewater to an Unnamed Tributary to the Cape Fear River (Outfall 007).
This outfall will discharge collected flows from the effluent channel consisting of ash basin
comingled treated decanting wastewater, storm water, constructed seep flows, and episodic
emergency flow from Internal Outfalls 001 and 005.
• Combined Wastewater to the Cape Fear (Outfall 008). This new outfall will discharge
combined flows of treated wastewater from the on-site treatment facility,if necessary,to assure
state Water Quality Standards are not contravened in the receiving stream.
• 1963/1970 Ash Basins (Outfall 008A). This new outfall is designated as an emergency
discharge only and will consist of ash basin decanting wastewater. This is limited to
discharging excess wastewater above the available treatment plant capacity during an eminent
threat of 1963/1970 Ash Basin overflow.
• 1963/1970 Ash Basins(Outfall 008B).This new outfall is designated as an emergency spillway
only and designed to safely pass a design storm event. This Outfall (lat. - 35°34'57.37"; long. -
79°02'57.50")discharges to Cape Fear River. Sampling of this spillway is waived due to unsafe
conditions associated with sampling during overflow events.
• Ash Beneficiation Retention Pond Wastewater (Outfall 009). This new outfall will
discharge episodic wastewater collected from isolated areas of the beneficiation operation
consisting of ash storage runoff, truck loading spills, and dust suppression.
• Constructed French Drain (Internal Outfall S-05). This internal outfall [Lat: 35° 35' 25"
N, Long: 79° 2' 47"W] is for discharge of combined flow from two French Drain sources to
effluent channel of Outfall 007.
Page 2 of 24

Permit NC0003433
2. Upon construction and completion of the new proposed Outfall for Outfall 008, notify DWR Raleigh
Regional Office and NPDES Complex Permitting Unit, in writing, at least two weeks prior to the
commencement of discharge from the newly constructed Outfall 008.Notification can be submitted via
email or by mail to the following address:
NC Division of Water Resources
Water Quality Regional Office Operations Section Supervisor
3800 Barrett Drive
Raleigh,NC 27609
And
NC Division of Water Resources
NPDES Complex Permitting Supervisor
1617 Mail Service Center
Raleigh,NC 27699-1617
3. Discharges are to the Cape Fear River and unnamed tributaries to the Cape Fear River,and are classified
as WS-IV waters in the Cape Fear River Basin.
Page 3 of 24

Permit NC0003433
Part I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Internal Outfall 001
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
a. During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge ' on an emergency basis 1978 (West) Ash Basin decanting
wastewater in excess of the facility's treatment capacity of 0.72 MGD to mitigate an eminent
1978 Ash Basin overflow. Such discharges shall be limited and monitored by the Permittee as
specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Measurement Sample Sample
Average Maximum Frequency 2 Type Location
Flow Daily during Estimate Effluent
Episodic Event
Footnotes:
1. The Permittee shall notify the Raleigh Regional Office(919) 791-4200 no later than the end
of the next business day of the occurrence of an emergency discharge event including time
of occurrence,duration, and cause.
2. During the duration of an emergency discharge event,the flow shall be reported daily.
b. Upon the occurrence of an emergency overflow event, Outfall 007 effluent sampling and
reporting shall commence immediately for the limited parameters listed in A.(3.)except for
Mercury and Chronic Toxicity, and shall continue once per week for the duration of the
emergency discharge event. Results of sampling from this Outfall shall meet the effluent
limitations in A. (3.).
c. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 4 of 24

Permit NC0003433
A. (2.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Internal Outfall 005
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
a. During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge I on an emergency basis 1985 (East) Ash Basin decanting
wastewater in excess of the facility's treatment capacity of 0.72 MGD to mitigate an eminent
1985 Ash Basin overflow. Such discharges shall be limited and monitored by the Permittee as
specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Measurement Sample Sample
Average Maximum Frequency 2 Type Location
Flow Daily during Estimate Effluent
Episodic Event
Footnotes:
1. The Permittee shall notify the Raleigh Regional Office(919)791-4200 no later than the end
of the next business day of the occurrence of an emergency discharge event including time
of occurrence and cause.
2. During the duration of a discharge event, the flow shall be reported daily.
b. Upon the occurrence of an emergency overflow event, Outfall 007 effluent sampling and
reporting shall commence immediately for the limited parameters listed in A.(3.)except for
Chronic Toxicity and Mercury, and shall continue once per week for the duration of the
emergency discharge event. Results of sampling from this Outfall shall meet the effluent
limitations in A. (3.).
c. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 5 of 24

Permit NC0003433
A. (3.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Outfall 007
(decanting) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Grade I Physical Chemical WPCS [15A NCAC 08G .0302]
a. During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge from Outfall 007 comingled treated ash basin decanting
wastewater (decanting the free water above the settled ash layer that does not involve
mechanical disturbance of the ash), stormwater, emergency episodic discharge from Internal
Outfalls 001 &005,and Constructed French Drain wastewater from S-05. Such discharges shall
be limited and monitored by the Permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Measurement Sample Type Sample
Average Maximum Frequency Location
Flow 0.73 MGD Daily Estimate 1 Effluent
pH 2 6.0<pH<9.0 S.U. Monthly Grab Effluent
Total Suspended Solids 3 30.0 mg/L 100.0 mg/L Monthly Grab Effluent
Oil and Grease 15.0 mg/L 20.0 mg/L Monthly Grab Effluent
Total Antimony 5.6 µg/L 5.6 µg/L Monthly Grab Effluent
Total Arsenic 10.0 µg/L 340.0 µg/L Weekly Grab Effluent
Total Molybdenum 160 µg/L 160 µg/L Monthly Grab Effluent
Total Nickel 25.0 µg/L 335.2 µg/L Monthly Grab Effluent
Total Selenium 5.0 µg/L 56.0 µg/L Weekly Grab Effluent
Total Zinc 125.7 µg/L 125.7 µg/L Monthly Grab Effluent
Turbidity 4 Monthly _ Grab Effluent
Total Mercury 5 12 ng/L, annual average Weekly Grab Effluent
Total Cadmium, µg/L 6 Monthly Grab Effluent
Total Copper, µg/L Monthly Grab Effluent
Total Lead, µg/L _ Monthly Grab Effluent
Fluoride,mg/L Monthly Grab Effluent
Sulfates,mg/L Monthly Grab Effluent
Total Dissolved Solids,mg/L Monthly Grab Effluent
Thallium, µg/L Monthly Grab Effluent
Chronic Toxicity 7 Quarterly Grab Effluent
Total Hardness,mg/L Quarterly Grab Effluent
Nitrate/Nitrite as N,mg/L Quarterly Grab Effluent
Total Kjeldahl Nitrogen, mg/L Quarterly Grab Effluent
Total Nitrogen,mg/L8 Quarterly Grab Effluent
Total Phosphorus,mg/L Quarterly Grab Effluent
Footnotes:
1. Flow estimate can be based on pumping log if pumps are in service at time of flow. If flow
is occurring with no pumps operating then flow measurement is required by using a V-notch
weir, stop watch and calibrated cylinder, or other methods approved by the Division (such
as flow sensor devices).
2. The facility shall continuously monitor pH when the decanting process commences and the
pump shall be shutoff automatically when the 15 minutes running average pH falls below
6.1 standard units or rises above 8.9 standards units. Pumping will be allowed to continue if
Page 6 of 24

Permit NC0003433
interruption might result in a dam failure or damage. The continuous pH monitoring is only
required when the pumps are employed. In the event of a shut-off of the decanting pumps,
due to continuous monitoring of pH, decanting may continue once the results of operational
samples show the wastewater is back to within the allowable range of the 15 minutes running
average for pH.
3. The facility shall continuously monitor TSS concentration when the decanting process
commences and the pump shall be shutoff automatically when the 15 minutes running
average exceeds 50 mg/L. Pumping will be allowed to continue if interruption might result
in a dam failure or damage.The continuous TSS monitoring is only required when the pumps
are employed. In the event of a shut-off of the decanting pumps, due to continuous
monitoring of TSS,decanting may continue once the results of operational samples show the
wastewater is back to within the allowable range of the 15 minutes running average for TSS.
4. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50
NTU. If the instream turbidity exceeds 50 NTU due to natural background conditions, the
discharge cannot cause turbidity to increase in the receiving stream. Therefore,if the effluent
measurement exceeds 50 NTU, the Permittee shall sample upstream and downstream
turbidity in the receiving waterbody, within 24 hours, to demonstrate the existing turbidity
level in the receiving waterbody was not increased. All data shall be reported on the DMRs.
(See 15A NCAC 2B .0211 (21)).
5. The facility shall use EPA method 1631 E. Annual average shall be the calendar average.
6. Total Cadmium shall be measured to a Practical Quantitation Level of 0.5 µg/L.
7. Chronic Toxicity (Ceriodaphnia dubia) at 90% in February, May, August, and November;
See Special Condition A. (10.).
8. Total Nitrogen=Total Kjeldahl Nitrogen+Nitrate/Nitrite as N.
b. When the facility commences the ash pond/ponds decanting/dewatering, the facility shall
treat the wastewater discharged from the ash pond/ponds using physical-chemical
treatment,if necessary, to assure state Water Quality Standards are not contravened in the
receiving stream. Duke Energy shall notify DWR NPDES Permitting and DWR Raleigh
Regional Office, in writing, within seven calendar days of installing additional physical-
chemical treatment at this Outfall.
c. If any one of these pollutants (As, Se, Sb, Hg, Mo, Ni, Pb and Zn) reaches 85% of the
allowable level during the decanting/dewatering, the facility shall immediately discontinue
discharge of the wastewater and report it to the Regional Office and Complex NPDES
Permitting Branch via telephone and e-mail.
d. The facility is allowed to drawdown the wastewater in the ash pond to no less than three feet
above the ash. The rate for lowering the liquid level in a coal ash pond shall not exceed one
(1) foot per day unless a higher rate is supported to the satisfaction of DEMLR and in
accordance with NCAC,Title 15 A, Subchapter 2K.
e. The facility shall use a floating pump station with free water skimmed from the ash basin
wastewater surface using an adjustable weir.
f. If no discharge occurs during the reporting period the Permittee shall submit its DMR
eDMR), as required, and indicate"No Flow" (15A NCAC 02B .0506(a)(1)(E)).
g. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 7 of 24

Permit NC0003433
A. (4.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Outfall 008
(decanting) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Grade I Physical Chemical WPCS [15A NCAC 08G .0302]
a. During the period beginning on the effective date of this permit,and lasting until the commencement
of ash basin dewatering, or the addition of groundwater remediation treated wastewater, or
permit expiration,the Permittee is authorized to discharge from Outfall 008 comingled treated ash
basin decanting wastewater(decanting the free water above the settled ash layer that does not
involve mechanical disturbance of the ash). Such discharges shall be limited and monitored by
the Permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Measurement Sample Type Sample
Average Maximum Frequency Location 1
Flow 0.72 MGD Daily Estimate 2 Effluent
pH 3 6.0<pH<9.0 S.U. Monthly Grab Effluent
Total Suspended Solids 4 30.0 mg/L 100.0 mg/L Monthly Grab Effluent
Oil and Grease 15.0 mg/L 20.0 mg/L Monthly Grab Effluent
Total Mercury 5 47 ng/L, annual average 5 Weekly Grab Effluent
Turbidity 6 Monthly Grab Effluent
Total Arsenic, pg/L Weekly Grab Effluent
Total Selenium, pg/L Weekly Grab Effluent
Total Nickel, pg/L Monthly Grab Effluent
Total Lead, pg/L Monthly Grab Effluent
Chronic Toxicity 7 Quarterly Grab Effluent
Total Hardness,mg/L Quarterly Grab Effluent
Nitrite/Nitrate as N,mg/L Quarterly Grab Effluent
Total Kjeldahl Nitrogen, mg/L Quarterly Grab Effluent
Total Nitrogen,mg/L 8 Quarterly Grab Effluent
Total Phosphorus,mg/L Quarterly Grab Effluent
Footnotes:
1. Effluent=comingled sample of the treatment facility's wastewater.
2. Flow estimate can be based on pumping log if pumps are in service at time of flow. If flow
is occurring with no pumps operating then flow measurement is required by using a V-notch
weir, stop watch and calibrated cylinder, or other methods approved by the Division (such
as flow sensor devices).
3. The facility shall continuously monitor pH when the decanting process commences and the
pump shall be shutoff automatically when the 15 minutes running average pH falls below
6.1 standard units or rises above 8.9 standards units. Pumping will be allowed to continue if
interruption might result in a dam failure or damage. The continuous pH monitoring is only
required when the pumps are employed. In the event of a shut-off of the decanting pumps,
due to continuous monitoring of pH, decanting may continue once the results of operational
samples show the wastewater is back to within the allowable range of the 15 minutes running
average for pH.
4. The facility shall continuously monitor TSS concentration when the decanting process
commences and the pump shall be shutoff automatically when the 15 minutes running
average exceeds 50 mg/L. Pumping will be allowed to continue if interruption might result
in a dam failure or damage.The continuous TSS monitoring is only required when the pumps
Page 8 of 24

Permit NC0003433
are employed. In the event of a shut-off of the decanting pumps, due to continuous
monitoring of TS S,decanting may continue once the results of operational samples show the
wastewater is back to within the allowable range of the 15 minutes running average for TS S.
5. The facility shall use EPA method 1631 E. Annual average shall be the calendar year.
6. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50
NTU. If the instream turbidity exceeds 50 NTU due to natural background conditions, the
discharge cannot cause turbidity to increase in the receiving stream. Therefore,if the effluent
measurement exceeds 50 NTU, the Permittee shall sample upstream and downstream
turbidity in the receiving waterbody, within 24 hours, to demonstrate the existing turbidity
level in the receiving waterbody was not increased.All data shall be reported on the DMRs.
(See 15A NCAC 2B .0211 (21)).
7. Chronic Toxicity(Ceriodaphnia dubia) at 1.7% in February, May, August, and November;
See Special Condition A. (10.).
8. Total Nitrogen=Total Kjeldahl Nitrogen+Nitrate/Nitrite as N.
b. When the facility commences the ash pond/ponds decanting/dewatering, the facility shall
treat the wastewater discharged from the ash pond/ponds using physical-chemical
treatment,if necessary,to assure state Water Quality Standards are not contravened in the
receiving stream. Duke Energy shall notify DWR NPDES Permitting and DWR Raleigh
Regional Office, in writing, within seven calendar days of installing additional physical-
chemical treatment at this Outfall.
c. If any one of these pollutants (As, Se, Hg, Ni, and Pb) reaches 85% of the allowable level
during the decanting/dewatering,the facility shall immediately discontinue discharge of the
wastewater and report it to the Regional Office and Complex NPDES Permitting Branch
via telephone and e-mail.
d. The facility is allowed to drawdown the wastewater in the ash pond to no less than three feet
above the ash. The rate for lowering the liquid level in a coal ash pond shall not exceed one
(1) foot per day unless a higher rate is supported to the satisfaction of DEMLR and in
accordance with NCAC, Title 15 A, Subchapter 2K.
e. The facility shall use a floating pump station with free water skimmed from the ash basin
wastewater surface using an adjustable weir.
f. If no discharge occurs during the reporting period the Permittee shall submit its DMR
(eDMR), as required, and indicate"No Flow" (15A NCAC 02B.0506(a)(1)(E)).
g. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 9 of 24

Permit NC0003433
A. (5.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Outfall 008
(dewatering) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Grade I Physical Chemical WPCS [15A NCAC 08G .0302]
a. During the period beginning with the start of ash pond dewatering, and lasting until the addition
of groundwater remediation treated wastewater, or permit expiration, the Permittee is authorized
to discharge from Outfall 008 comingled treated ash basin dewatering wastewater. Such
discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Measurement Sample Type Sample
Average Maximum Frequency Location 1
Flow 0.72 MGD Daily Estimate 2 Effluent
pH 3 6.0<pH<9.0 S.U. Weekly Grab Effluent
Total Suspended Solids 4 30.0 mg/L 100.0 mg/L Weekly Grab Effluent
Oil and Grease 15.0 mg/L 20.0 mg/L Weekly Grab Effluent
Total Selenium 0.30 mg/L 2.73 mg/L Weekly Grab Effluent
Total Mercury 5 47 ng/L, annual average Weekly Grab Effluent
Turbidity 6 Weekly Grab Effluent
Total Aluminum, mg/L Weekly Grab Effluent
Total Arsenic, µg/L Weekly Grab Effluent
Total Cadmium, µg/L 7 Weekly Grab Effluent
Total Copper, µg/L Weekly Grab Effluent
Total Nickel, µg/L Weekly Grab Effluent
Total Lead, µg/L Weekly Grab Effluent
Chronic Toxicity 8 Monthly Grab Effluent
Total Hardness,mg/L Quarterly Grab Effluent
Nitrite/Nitrate as N,mg/L Quarterly Grab Effluent
Total Kjeldahl Nitrogen, mg/L Quarterly Grab Effluent
Total Nitrogen, mg/L 9 Quarterly Grab Effluent
Total Phosphorus,mg/L Quarterly Grab Effluent
Footnotes:
1. Effluent=comingled sample of the treatment facility's treated wastewater.
2. Flow estimate can be based on pumping log if pumps are in service at time of flow. If flow
is occurring with no pumps operating then flow measurement is required by using a V-notch
weir, stop watch and calibrated cylinder, or other methods approved by the Division (such
as flow sensor devices).
3. The facility shall continuously monitor pH when the dewatering process commences and the
pump shall be shutoff automatically when the 15 minutes running average pH falls below
6.1 standard units or rises above 8.9 standards units. Pumping will be allowed to continue if
interruption might result in a dam failure or damage. The continuous pH monitoring is only
required when the pumps are employed. In the event of a shut-off of the dewatering pumps,
due to continuous monitoring of pH,dewatering may continue once the results of operational
samples show the wastewater is back to within the allowable range of the 15 minutes running
average for pH.
4. The facility shall continuously monitor TSS concentration when the dewatering process
commences and the pump shall be shutoff automatically when the 15 minutes running
average exceeds 50 mg/L. Pumping will be allowed to continue if interruption might result
Page 10 of 24

Permit NC0003433
in a dam failure or damage. The continuous TSS monitoring is only required when the pumps
are employed. In the event of a shut-off of the dewatering pumps, due to continuous
monitoring of TSS, dewatering may continue once the results of operational samples show
the wastewater is back to within the allowable range of the 15 minutes running average for
TSS.
5. The facility shall use EPA method 1631E. Annual average shall be the calendar year.
6. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50
NTU. If the instream turbidity exceeds 50 NTU due to natural background conditions, the
discharge cannot cause turbidity to increase in the receiving stream. Therefore,if the effluent
measurement exceeds 50 NTU, the Permittee shall sample upstream and downstream
turbidity in the receiving waterbody, within 24 hours, to demonstrate the existing turbidity
level in the receiving waterbody was not increased. All data shall be reported on the DMRs.
(See 15A NCAC 2B .0211 (21)).
7. Total Cadmium shall be measured to a Practical Quantitation Level of 0.5 µg/L.
8. Chronic Toxicity(Ceriodaphnia dubia)at 1.7%; See Special Condition A. (11.).
9. Total Nitrogen=Total Kjeldahl Nitrogen+Nitrate/Nitrite as N.
b. When the facility commences the ash pond/ponds decanting/dewatering,the facility shall
treat the wastewater discharged from the ash pond/ponds using physical-chemical
treatment,if necessary,to assure state Water Quality Standards are not contravened in the
receiving stream.Duke Energy shall notify DWR NPDES Permitting and DWR Raleigh
Regional Office,in writing,within seven calendar days of installing additional physical-
chemical treatment at this Outfall.
c. Dewatering is the removal of interstitial water starting when the free water level in the
settled ash basin is less than 3 feet, or if the water level is more than 3 feet above the ash
starting when mechanical disturbance of the ash occurs.The limits and conditions in A. (5.)
shall remain enforced until the groundwater remediation treated discharge has commenced.
d. If any one of these pollutants (As, Se, Hg, Ni, and Pb) reaches 85% of the allowable level
during the decanting/dewatering,the facility shall immediately discontinue discharge of the
wastewater and report it to the Regional Office and Complex NPDES Permitting Branch
via telephone and e-mail.
e. The facility shall submit written notification to the DWR Complex NPDES Permitting Unit
and the DWR Raleigh Regional Office of the intent to begin the initial ash basin dewatering
activity seven calendar days prior to commencing the dewatering.
f. The rate for lowering the liquid level in a coal ash pond shall not exceed one(1)foot per day
unless a higher rate is supported to the satisfaction of DEMLR and in accordance with
NCAC, Title 15A, Subchapter 2K.
g. If no discharge occurs during the reporting period the Permittee shall submit its DMR
(eDMR), as required, and indicate"No Flow" (15A NCAC 02B .0506(a)(1)(E)).
h. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 11 of 24

Permit NC0003433
A. (6.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Outfall 008
(dewatering and ground water remediation) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Grade I Physical Chemical WPCS [15A NCAC 08G .0302]
a. During the period beginning with the start of groundwater remediation, and lasting until
completion/termination of all ash basin dewatering activities,or permit expiration,the Permittee
is authorized to discharge from Outfall 008 comingled treated ash pond dewatering wastewater
and groundwater remediation wastewater. Such discharges shall be limited and monitored by the
Pennittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Measurement Sample Type Sample
Average Maximum Frequency Location
Flow 0.72 MGD Daily _ Estimate 2 Effluent
pH 3 6.0<pH<9.0 S.U. Weekly Grab Effluent
Temperature, °C Weekly Grab Effluent
Total Suspended Solids 4 30.0 mg/L 100.0 mg/L Weekly Grab Effluent
Oil and Grease 15.0 mg/L 20.0 mg/L Weekly Grab Effluent
Total Aluminum 385.1 mg/L 385.1 mg/L Weekly Grab Effluent
Total Nickel 1.48 mg/L 16.3 mg/L Weekly Grab Effluent
Total Selenium 0.30 mg/L 2.73 mg/L Weekly Grab Effluent
Total Mercury 5 47 ng/L, annual average 5 Weekly Grab Effluent
Turbidity 6 Weekly Grab Effluent
Total Arsenic, pg/L Weekly Grab Effluent
Total Beryllium, µg/L Weekly Grab Effluent
Total Copper, µg/L Weekly Grab Effluent
Total Lead, µg/L Weekly Grab Effluent
Total Silver, µg/L 7 Weekly Garb Effluent
Total Zinc, µg/L Weekly Grab Effluent
Sulfates,mg/L Weekly Grab Effluent
Total Dissolved Solids,mg/L Weekly Grab Effluent
Chronic Toxicity 8 Monthly Grab Effluent
Total Hardness,mg/L Quarterly Grab Effluent
Conductivity, µmhos/cm Quarterly Grab Effluent
Nitrite/Nitrate as N,mg/L Quarterly Grab Effluent
Total Kjeldahl Nitrogen, mg/L Quarterly Grab Effluent
Total Nitrogen,mg/L 9 Quarterly Grab Effluent
Total Phosphorus,mg/L Quarterly Grab Effluent
Footnotes:
1. Effluent= comingled sample of the treatment facility's treated wastewater.
2. Flow estimate can be based on pumping log if pumps are in service at time of flow. If flow is
occurring with no pumps operating then flow measurement is required by using a V-notch
weir, stop watch and calibrated cylinder, or other methods approved by the Division (such as
flow sensor devices).
3. The facility shall continuously monitor pH when dewatering process commences and the
pump shall be shutoff automatically when the 15 minutes running average pH falls below 6.1
standard units or rises above 8.9 standards units. Pumping will be allowed to continue if
interruption might result in a dam failure or damage. The continuous pH monitoring is only
Page 12 of 24

Permit NC0003433
required when the pumps are employed. In the event of a shut-off of the dewatering pumps,
due to continuous monitoring of pH,dewatering may continue once the results of operational
samples show the wastewater is back to within the allowable range of the 15 minutes running
average for pH.
4. The facility shall continuously monitor TSS concentration when the dewatering process
commences and the pump shall be shutoff automatically when the 15 minutes running average
exceeds 50 mg/L. Pumping will be allowed to continue if interruption might result in a dam
failure or damage. The continuous TSS monitoring is only required when the pumps are
employed. In the event of a shut-off of the dewatering pumps, due to continuous monitoring
of TSS,dewatering may continue once the results of operational samples show the wastewater
is back to within the allowable range of the 15 minutes running average for TSS.
5. The facility shall use EPA method 1631 E. Annual average shall be the calendar year.
6. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50
NTU. If the instream turbidity exceeds 50 NTU due to natural background conditions, the
discharge cannot cause turbidity to increase in the receiving stream. Therefore,if the effluent
measurement exceeds 50 NTU,the Permittee shall sample upstream and downstream turbidity
in the receiving waterbody, within 24 hours, to demonstrate the existing turbidity level in the
receiving waterbody was not increased. All data shall be reported on the DMRs. (See 15A
NCAC 2B .0211 (21)).
7. Total Silver shall be measured to a Practical Quantitation Level of 1.0 µg/L.
8. Chronic Toxicity(Ceriodaphnia dubia) at 1.7%; See Special Condition A. (11.).
9. Total Nitrogen=Total Kjeldahl Nitrogen+Nitrate/Nitrite as N.
b. When the facility commences the ash pond/ponds decanting/dewatering,the facility shall
treat the wastewater discharged from the ash pond/ponds using physical-chemical
treatment,if necessary, to assure state Water Quality Standards are not contravened in the
receiving stream.Duke Energy shall notify DWR NPDES Permitting and DWR Raleigh
Regional Office,in writing,within seven calendar days of installing additional physical-
chemical treatment at this Outfall.
c. Dewatering is the removal of interstitial water starting when the free water level in the
settled ash basin is less than 3 feet, or if the water level is more than 3 feet above the ash
starting when mechanical disturbance of the ash occurs.The limits and conditions in A. (6.)
shall remain enforced until all ash basins dewatering is completed.
d. If any one of these pollutants (As,Al,Se,Hg,Ni,and Pb)reaches 85% of the allowable level
during the decanting/dewatering,the facility shall immediately discontinue discharge of the
wastewater and report it to the Regional Office and Complex NPDES Permitting Branch
via telephone and e-mail.
e. The facility shall submit written notification to the DWR Complex NPDES Permitting Unit
and the DWR Raleigh Regional Office of the intent to begin the addition of groundwater
remediation wastewater to the ash basins treatment facility's influent in conjunction with
ash basin dewatering wastewater, seven calendar days prior to commencing the addition.
See Special Condition A. (18.) for further requirements.
f. The rate for lowering the liquid level in a coal ash pond shall not exceed one(1)foot per day
unless a higher rate is supported to the satisfaction of DEMLR and in accordance with
NCAC,Title 15A, Subchapter 2K.
g. If no discharge occurs during the reporting period the Permittee shall submit its DMR
(eDMR), as required, and indicate"No Flow" (15A NCAC 02B .0506(a)(1)(E)).
h. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 13 of 24

Permit NC0003433
A. (7.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Outfall 008
(ground water remediation) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Grade I Physical Chemical WPCS [15A NCAC 08G .0302]
a. During the period beginning with the completion/termination of all ash pond dewatering
activities,and lasting until permit expiration,the Permittee is authorized to discharge from Outfall
008 treated groundwater remediation wastewater. Such discharges shall be limited and
monitored by the Permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location
Flow 0.72 MGD Weekly Continuous 1 Effluent
pH 6.0<pH<9.0 S.U. Weekly Grab Effluent
Temperature, °C Weekly Grab Effluent
Total Suspended Solids 30.0 mg/L 45.0 mg/L Weekly Grab Effluent
Oil and Grease 15.0 mg/L 20.0 mg/L Weekly Grab Effluent
Total Aluminum 385.1 mg/L 385.1 mg/L 2/Month Grab Effluent
Total Nickel 1.48 mg/L 16.3 mg/L 2/Month Grab Effluent
Sulfates 14,811 mg/L 14,811 mg/L 2/Month Grab Effluent
Turbidity 2 2/Month Grab Effluent
Total Mercury,ng/L 3 2/Month Grab Effluent
Total Arsenic, µg/L 2/Month Grab Effluent
Total Beryllium, µg/L 2/Month Grab Effluent
Total Lead, µg/L 2/Month Grab Effluent
Total Selenium, µg/L 2/Month Grab Effluent
Total Silver, µg/L 4 2/Month Grab Effluent
Total Zinc, µg/L 2/Month Grab Effluent
Total Dissolved Solids,mg/L 2/Month Grab Effluent
Total Hardness,mg/L Quarterly Grab Effluent
Chronic Toxicity 5 Quarterly Grab Effluent
Conductivity, µmhos/cm Quarterly Grab Effluent_
Nitrite/Nitrate as N,mg/L Quarterly Grab Effluent
Total Kjeldahl Nitrogen, mg/L Quarterly Grab Effluent
Total Nitrogen,mg/L 6 Quarterly Grab Effluent
Total Phosphorus,mg/L Quarterly Grab Effluent
Footnotes:
1. Continuous flow measurement is required by using a calibrated V-notch weir,meter,or other methods
approved by the Division (such as flow sensor devices).
2. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50
NTU. If the instream turbidity exceeds 50 NTU due to natural background conditions, the
discharge cannot cause turbidity to increase in the receiving stream. Therefore,if the effluent
measurement exceeds 50 NTU, the Permittee shall sample upstream and downstream
turbidity in the receiving waterbody, within 24 hours, to demonstrate the existing turbidity
level in the receiving waterbody was not increased. All data shall be reported on the DMRs.
(See 15A NCAC 2B .0211 (21)).
3. The facility shall use EPA method 1631 E.
4. Total Silver shall be measured to a Practical Quantitation Level of 1.0 µg/L.
Page 14 of 24

Permit NC0003433
5. Chronic Toxicity(Ceriodaphnia dubia) at 1.7% in February, May, August, and November;
See Special Condition A. (10.).
6. Total Nitrogen=Total Kjeldahl Nitrogen+Nitrate/Nitrite as N.
b. The facility shall submit written notification to the DWR Complex NPDES Permitting Unit
and the DWR Raleigh Regional Office of the intent to continue groundwater wastewater
addition to the treatment facility's influent after the completion/termination of all ash
basins dewatering activities,seven calendar days prior to completion and termination of all
ash basin dewatering. See Special Condition A. (18.)for further requirements.
c. If no discharge occurs during the reporting period the Permittee shall submit its DMR
(eDMR), as required, and indicate"No Flow" (15A NCAC 02B .0506(a)(1)(E)).
d. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 15 of 24

Permit NC0003433
A. (8.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Outfall 008A
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
a. During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge) from Outfall 008A on an emergency basis 1963/1970 Ash
Basin decanting wastewater in excess of the facility's treatment capacity (> 0.72 MGD) to
mitigate an eminent 1963/1970 Ash Basin overflow. Such discharges shall be limited and
monitored by the Permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Measurement Sample Sample
Average Maximum Frequency 2 Type Location
Daily during
Flow Episodic Event Estimate Effluent
pH 6.0<pH<9.0 S.U. Daily during Grab Effluent
Episodic Event
Total Suspended Solids 30.0 mg/L 100.0 mg/L Daily during Grab Effluent
Episodic Event
Oil and Grease 15.0 mg/L 20.0 mg/L Daily during Grab Effluent
Episodic Event
Footnotes
1. The Permittee shall notify the Raleigh Regional Office (919) 791- 4200 no later than the
end of the next business day of the occurrence of an emergency discharge event including
time of occurrence, duration, and cause.
2. During the duration of an emergency discharge event,the flow shall be reported daily.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 16 of 24

Permit NC0003433
A. (9.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Outfall 009
(Beneficiation miscellaneous wastewater) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
Grade I Physical Chemical WPCS [15A NCAC 08G .0302]
a. During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge episodic beneficiation process area miscellaneous
wastewater (ash pile run off, wash water, captured dust spills) from Outfall 009. Such
discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICSMonthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location 1
Flow 0.005 MGD Monthly Estimate 2 Effluent
Temperature, °C Monthly Grab Effluent
pH 6.0<pH<9.0 S.U. Monthly Grab Effluent
_Total Suspended Solids 30.0 mg/L 100.0 mg/L Monthly Grab Effluent
Oil and Grease 15.0 mg/L 20.0 mg/L Monthly Grab Effluent
Turbidity3 Monthly Grab Effluent
Total Mercury 4 47 ng/L, annual average s Monthly Grab Effluent
Total Arsenic, µg/L Monthly Grab Effluent
Total Selenium, µg/L Monthly Grab Effluent
Footnotes:
1. Effluent=comingled sample of facility treated wastewater.
2. Flow estimate can be based on pumping log if pumps are in service at time of flow. If flow
is occurring with no pumps operating then flow measurement is required by using a V-notch
weir, stop watch and calibrated cylinder, or other methods approved by the Division (such
as flow sensor devices).
3. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50
NTU. If the instream turbidity exceeds 50 NTU due to natural background conditions, the
discharge cannot cause turbidity to increase in the receiving stream. Therefore,if the effluent
measurement exceeds 50 NTU, the Permittee shall sample upstream and downstream
turbidity in the receiving waterbody, within 24 hours, to demonstrate the existing turbidity
level in the receiving waterbody was not increased. All data shall be reported on the DMRs.
(See 15A NCAC 2B .0211 (21)).
4. The facility shall use EPA method 1631 E. Annual average shall be the calendar year.
b. If no discharge occurs during the reporting period the Permittee shall submit its DMR
(eDMR), as required, and indicate"No Flow" (15A NCAC 02B .0506(a)(1)(E)).
c. The Permittee shall submit to the Division a completed EPA Form 2C for the addition of
beneficiation wastewaters no later than 180 days after the introduction of the beneficiation
wastewaters to the treatment system. The Division may re-open this permit and assign
additional effluent limits or conditions after review of the EPA 2C data.
d. There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 17 of 24

Permit NC0003433
A.(10.) CHRONIC TOXICITY LIMIT-Outfalls 007 and 008 (Quarterly)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality
to Ceriodaphnia dubia at an effluent concentration of 90% for Outfall 007 and 1.7% for Outfall 008.
The permit holder shall perform, at a minimum, quarterly monitoring using test procedures outlined in the
"North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 201.0, or
subsequent versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure"
(Revised- December 2010) or subsequent versions. The tests will be performed during the months of
February, May, August, and November. These months signify the first month of each three-month
toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be obtained during
representative effluent discharge and shall be performed at the NPDES permitted final effluent discharge
below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below
the permit limit, then multiple-concentration testing shall be performed, at a minimum, in each of
the two following months as described in"North Carolina Phase II Chronic Whole Effluent Toxicity
Test Procedure" (Revised-December 2010) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form(MR-1) for the months in which tests were performed,using the parameter code TGP3B
for the pass/fail results and THP3B for the Chronic Value. Additionally,DWR Form AT-3 (original) is to
be sent to the following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,NC 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30
days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate
signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine
is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the Permittee will complete the information located at the top of the aquatic toxicity (AT) test
form indicating the facility name, permit number, pipe number, county, and the month/year of the report
with the notation of"No Flow"in the comment area of the form. The report shall be submitted to the Water
Sciences Section at the address cited above.
Should the Pennittee fail to monitor during a month in which toxicity monitoring is required, monitoring
will be required during the following month. Assessment of toxicity compliance is based on the toxicity
testing quarter, which is the three month time interval that begins on the first day of the month in which
toxicity testing is required by this permit and continues until the final day of the third month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division
of Water Resources indicate potential impacts to the receiving stream, this permit may be re-opened and
modified to include alternate monitoring requirements or limits.
Page 18 of 24

Permit NC0003433
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival,minimum control organism reproduction, and appropriate environmental controls, shall
constitute an invalid test and will require immediate follow-up testing to be completed no later than the
last day of the month following the month of the initial monitoring.
A. (11.) CHRONIC TOXICITY LIMIT- Outfall 008 (Monthly)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality
to Ceriodaphnia dubia at an effluent concentration of 1.7% for Outfall 008.
The permit holder shall perform, at a minimum, monthly monitoring using test procedures outlined in the
"North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010, or
subsequent versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure"
(Revised- December 2010) or subsequent versions. Effluent sampling for this testing must be obtained
during representative effluent discharge and shall be performed at the NPDES permitted final effluent
discharge below all treatment processes.
If the test procedure performed as the first test of any month results in a failure or ChV below the
permit limit, then multiple-concentration testing shall be performed, at a minimum, in each of the
two following months as described in"North Carolina Phase II Chronic Whole Effluent Toxicity Test
Procedure" (Revised-December 2010)or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form(MR-1) for the months in which tests were performed,using the parameter code TGP3B
for the pass/fail results and THP3B for the Chronic Value. Additionally, DWR Form AT-3 (original)is to
be sent to the following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh,NC 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Water Sciences Section no later than 30
days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate
signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine
is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the Permittee will complete the information located at the top of the aquatic toxicity (AT) test
form indicating the facility name, permit number, pipe number, county, and the month/year of the report
with the notation of"No Flow"in the comment area of the form. The report shall be submitted to the Water
Sciences Section at the address cited above.
Assessment of toxicity compliance is based on the toxicity testing month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division
of Water Resources indicate potential impacts to the receiving stream, this permit may be re-opened and
modified to include alternate monitoring requirements or limits.
Page 19 of 24

Permit NC0003433
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival,minimum control organism reproduction, and appropriate environmental controls, shall
constitute an invalid test and will require immediate follow-up testing to be completed no later than the
last day of the month following the month of the initial monitoring.
A. (12.)ADDITIONAL CONDITIONS AND DEFINITIONS
[NCGS 143-213.3 (a)(2) and NCGS 143-213.66]
1. EPA methods 200.7 or 200.8 (or the most current versions) shall be used for analyses of all metals
except for total mercury(EPA Method 1631 E).
2. All effluent samples for all external outfalls shall be taken at the most accessible location after the
final treatment but prior to discharge to waters of the U.S. (40 CFR 122.41(j)).
3. The term low volume waste sources mean wastewater from all sources except those for which
specific limitations are otherwise established in this part(40 CFR 423.11 (b)).
4. The term chemical metal cleaning waste means any wastewater resulting from cleaning any metal
process equipment with chemical compounds, including,but not limited to,boiler tube cleaning(40
CFR 423.11 (c)).
5. The term metal cleaning waste means any wastewater resulting from cleaning [with or without
chemical cleaning compounds] any.metal process equipment including, but not.limited to, boiler
tube cleaning,boiler fireside cleaning, and air preheater cleaning(40 CFR 423.11 (d)).
6. For all outfalls where the flow measurement is to be"estimated"the estimate can be done by using
calibrated V-notch weir, stop-watch and graduated cylinder, or other methods approved by the
Division(such as flow sensor devices).
7. The term "FGD wet scrubber wastewater" means wastewater resulting from the use of the flue-gas
desulfurization wet scrubber.
8. There shall be no discharge of polychlorinated biphenyl compounds.
9. The permittee shall report the presence of cenospheres observed in any samples on the DMRs in the
comment section.
10. Nothing contained in this permit shall be construed as a waiver by the permittee of any right to a
hearing it may have pursuant to State or Federal laws and regulations.
A. (13.) INSTREAM MONITORING
[G.S. 143-215.3 (a) (2), G.S. 143-215.66]
The facility shall conduct monthly in-stream monitoring for total arsenic,total selenium,total mercury,total
chromium, dissolved lead, dissolved cadmium, dissolved copper, dissolved zinc, total bromide, total
hardness(as CaCO3),temperature,turbidity, and total dissolved solids(TDS). The monitoring results shall
be reported on the facility's Discharge Monitoring Reports and included with the NPDES permit renewal
application.
Instream Sample Description_ Location
Upstream Outfall 008 0.9 miles upstream from Outfall 008A in Cape Fear River
Downstream Outfall 008 Approximately 250 meters downstream from Outfall 008 in Cape
Fear River
Instream monitoring is provisionally waived considering the permittee's participation in the Middle
Cape Fear River Basin Association provided the Association agrees to sample for all the parameters
listed in this condition and at the specified locations.Instream monitoring shall be conducted as stated
in this permit should the permittee end its participation in the Association.
Page 20 of 24

Permit NC0003433
A. (14.) STRUCTURAL INTEGRITY INSPECTIONS OF ASH BASIN DAM
[15A NCAC 02K .0208]
The facility shall meet the dam design and dam safety requirements per 15A NCAC 2K.
A. (15.) FISH TISSUE MONITORING NEAR ASH BASIN DISCHARGE OUTFALL 008
[NCGS 143-215.3(a)(2)]
The facility shall conduct fish tissue monitoring annually and submit the results with the NPDES permit
renewal application. The objective of this monitoring is to evaluate potential uptake of pollutants by fish
tissue near the ash pond discharge. The parameters analyzed in fish tissue shall include arsenic, selenium,
and mercury. The monitoring shall be conducted in accordance with the sampling plan approved by the
Division.The plan should be submitted to the Division within 180 days from the effective date of the permit.
Upon approval,the plan becomes an enforceable part of the permit.
Copies of all the study plans, study results, and any other applicable materials should be submitted to:
1) Electronic Version Only(pdf and CD)
Division of Water Resources
WQ Permitting Section-NPDES
1617 Mail Service Center
Raleigh,NC 27699-1617
2) Electronic Version(pdf and CD) and Hard Copy
Division of Water Resources
Water Sciences Section
1623 Mail Service Center
Raleigh,NC 27699-1623
A. (16.)COMPLIANCE BOUNDARY
[15A NCAC 02L.0107]
The compliance boundary for the disposal system shall be specified in accordance with 15A NCAC 02L
.0107(a) or(b)dependent upon the date permitted. An exceedance of groundwater standards at or beyond
the compliance boundary is subject to remediation action according to 15A NCAC 02L.0106(c), (d), or(e)
as well as enforcement actions in accordance with North Carolina General Statute 143-215.6A through 143-
215.6C.
The compliance boundary map for this facility is incorporated herein and attached hereto as Attachment A.
A. (17.)APPLICABLE STATE LAW(State Enforceable Only)
[NCGS 143-215.1(b)]
This facility shall meet the General Statute requirements under NCGS § 130A-309.200 et seq. This permit
may be reopened to include new requirements imposed under these Statutes.
Page 21 of 24

Permit NC0003433
A.(18.)ADDITION OF OTHER WASTEWATERS TO ASH BASIN TREATMENT SYSTEM
[G.S. 143-214.1 (a)]
The Permittee may introduce on-site groundwater remediation wastewater as an additional influent to the
0.72.MGD capacity treatment system discharging only to Outfall 008 provided it does not result in violation
of NC water quality standards or EPA criteria. If necessary the Permittee shall determine what additional
treatment is required and then have operational prior to the addition of ground water wastewater.
The Permittee shall submit to the Division EPA Form 2C for the ground water wastewater addition no later
than 180 days after the introduction of the ground water wastewater to the treatment systems. The Division
may open upon further evaluation the permit and assign additional effluent limits or conditions.
A. (19.)ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[G.S. 143-215.1(B)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program
reports. The final NPDES Electronic Reporting Rule was adopted and became effective on December 21,
2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this
permit(Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
1. ReportingRequirements [Supersedes Section D. (2.) and Section E. (5.) (a)1
The permittee shall report discharge monitoring data electronically using the NC DWR's Electronic
Discharge Monitoring Report(eDMR) internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each month and
submitted electronically using eDMR. The eDMR system allows permitted facilities to enter
monitoring data and submit DMRs electronically using the internet. Until such time that the state's
eDMR application is compliant with EPA's Cross-Media Electronic Reporting Regulation
(CROMERR), permittees will be required to submit all discharge monitoring data to the state
electronically using eDMR and will be required to complete the eDMR submission by printing,signing,
and submitting one signed original and a copy of the computer printed eDMR to the following address:
NC DENR/Division of Water Resources/Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh,North Carolina 27699-1617
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility
being physically located in an area where less than 10 percent of the households have broadband access,
then a temporary waiver from the NPDES electronic reporting requirements may be granted and
discharge monitoring data may be submitted on paper DMR forms(MR 1, 1.1,2,3)or alternative forms
approved by the Director. Duplicate signed copies shall be submitted to the mailing address above. See
"How to Request a Waiver from Electronic Reporting"section below.
Page 22 of 24

Permit NC0003433
Regardless of the submission method, the first DMR is due on the last day of the month following the
issuance of the permit or in the case of a new facility, on the last day of the month following the
commencement of discharge.
Starting on December 21, 2020, the permittee must electronically report the following compliance
monitoring data and reports, when applicable:
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports; and
• Clean Water Act(CWA) Section 316(b)Annual Reports.
The permittee may seek an electronic reporting waiver from the Division(see"How to Request a Waiver
from Electronic Reporting"section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the permittee must identify the initial recipient at the time of
each electronic submission. The permittee should use the EPA's website resources to identify the initial
recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity
(EPA or the state authorized by EPA to implement the NPDES program) that is the designated entity
for receiving electronic NPDES data[see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for each
type of electronic submission and for each state. Instructions on how to access and use the appropriate
electronic reporting tool will be available as well. Information on EPA's NPDES Electronic Reporting
Rule is found at:
http://www2.ep a.gov/compliance/final-national-pollutant-discharge-elimination-system-npdes-
electronic-reporting-rule.
Electronic submissions must start by the dates listed in the"Reporting Requirements"section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an
electronic reporting waiver, a permittee must first submit an electronic reporting waiver request to the
Division. Requests for temporary electronic reporting waivers must be submitted in writing to the
Division for written approval at least sixty (60) days prior to the date the facility would be required
under this permit to begin submitting monitoring data and reports. The duration of a temporary waiver
shall not exceed 5 years and shall thereupon expire. At such time,monitoring data and reports shall be
submitted electronically to the Division unless the permittee re-applies for and is granted a new
temporary electronic reporting waiver by the Division. Approved electronic reporting waivers are not
transferrable. Only permittees with an approved reporting waiver request may submit monitoring data
and reports on paper to the Division for the period that the approved reporting waiver request is
effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on the
following web page:
Page 23 of 24

Permit NC0003433
http://deq.nc.gov/about/divisions/water-resources/edmr
4. SignatoryRequirements !Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)I
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II,
Section B. (11.)(a) or by a duly authorized representative of that person as described in Part II, Section
B. (11.)(b). A person, and not a position, must be delegated signatory authority for eDMR reporting
purposes.
For eDMR submissions,the person signing and submitting the DMR must obtain an eDMR user account
and login credentials to access the eDMR system. For more information on North Carolina's eDMR
system, registering for eDMR and obtaining an eDMR user account, please visit the following web
page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make the
following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL
BE ACCEPTED:
"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. I am
aware that there are significant penalties for submitting false information, including the possibility of
fines and imprisonment for knowing violations."
5. Records Retention !Supplements Section D. (6.)j
The permittee shall retain records of all Discharge Monitoring Reports,including eDMR submissions.
These records or copies shall be maintained for a period of at least 3 years from the date of the report.
This period maybe extended by request of the Director at any time [40 CFR 122.41].
Page 24 of 24

Permit NC0003433
A. (20.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS—Outfall 008B [15A
NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration, the Permittee
is authorized to discharge on an emergency basis from Outfall 008B (emergency spillway). Such
discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location
Flow Waived Estimate Effluent
Sampling of this spillway is waived due to unsafe conditions associated with sampling during an
overflow event.
The Permittee shall notify the Raleigh Regional Office [phone] no later than the end of the
next business day of the occurrence of an emergency discharge event including time of occurrence,
duration, and cause.
•
Page 25 of 24

Permit NC0003433
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Outfall 007 Outfall 008 Outfall 008(Proposed) Outfall 009 / m
Latitude: 35°35'3" N 35°35'37.7" N 35°35'29.54" N 35°35'37.9" N i
Longitude: 79°2'27" W 79°3'4.6" W 79°3'3.85" W 79°3'4.1" W
Stream Class: WS-IV N Facility Location
Subbasin: 03-06-07 HUC: 03030002 Cape Fear Steam Electric Plant NC0003433
Receiving Stream: Cape Fear River Chatham County

lir, DUKE Cape Fear Steam Electric Plant
ENERGY. Monc r.00 N&2�9
February 20,2020
Ms. Julie Grzyb
North Carolina Department of Environmental Quality
Division of Water Resources, Complex Permitting Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: Duke Energy Progress, LLC RECEIVE
Cape Fear Steam Electric Plant MAR 17 2020
NPDES Permit Modification NPDES Permit
NC0003433 NCDEQ/DWR/NPDES
Chatham Count
Dear Ms. Grzyb:
Duke Energy Progress, LLC (Duke Energy) submits this letter to request modification of
the NPDES permit for Cape Fear Steam Electric Plant to add an emergency spillway at
the inactive 1963/1970 ash basin. This request is to support compliance with the North
Carolina Department of Environmental Quality (NCDEQ) Dam Safety's new regulations
for ash basin dams in North Carolina passed in April 2019. The request is in follow up to
discussions between Duke Energy and NCDEQ water quality and dam safety staff on
August 21, 2019 and Duke Energy and Division of Water Resources on November 7,
2019.
The ash basin is currently scheduled for decommissioning; however, prior to
decommissioning, the ash basin is required to contain and safely pass a design storm
event consistent with federal and state regulations. The current regulatory design storm
has been updated from '/a Probable Maximum Flood, PMF, to the full PMF. The PMF
equates to 27.50-inches of rainfall in a 6-hour period
In order for the combined 1963/1970 inactive ash basins to safely pass the full PMF, a
new auxiliary emergency overflow spillway is required to be constructed to release
stormwater to the Cape Fear River. The proposed spillway is designed to maintain 1-foot
of freeboard within the basin at a minimum crest of 183 ft. Additionally, the spillway is set
at an elevation sufficient to ensure that the basin will contain 100-year, 24-hour storm
without discharge. The emergency spillway will be located on the southwest corner of
the 1963 ash basin (Let: 35°34'57.37"/Long: -79°02'57.50"adjacent to Outlet!008A.
Duke Energy requests an emergency spillway be added to the NPDES permit with
discharge to the Cape Fear River. As this outfall would only discharge in an extreme
weather event and would consist primarily of rain that has fallen on the footprint of the
inactive ash basin, we request that sampling be waived in the event of a discharge as

,7
ciriis DUKE Cape Fear Steam Electric Alan!
ENERGY SOO I7
• Muncure,N NC C 2755959
conditions are unsafe. During conditions where sampling is achievable, samples of the
same basin water discharge at adjacent Outfall 008A, located approximately 150 feet
away, can easily characterize the discharge.
Enclosed for your consideration in support of this request are the following:
1. Map of proposed emergency spillway;
2. Design Drawings;
3. A check in the amount of$1030.
Should you have any questions regarding this submittal or require additional
information, please contact Joyce Dishmon at [phone] or email
[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,
lssa J. Zarzar
General Manager—East Region
CCP Operations and Maintenance
Cc: Scott Vinson, NC DWR,
Water Quality Regional Office,
3800 Barrett Drive, Raleigh, NC 27609
Shannon Langley via email
Joyce Dishmon (filenet) via email
Jonathan Starnes via email

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Permit Modification -
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A. NC0003433
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Fact Sheet
NPDES Permit No. NC0O03433
Permit Writer/Email Contact: Sergei Chernikov,Ph.D., [e-mail]:
Date: May 27,2020
Division/Branch:NC Division of Water Resources/NPDES Complex Permitting
Fact Sheet Template: Version 09Jan2017
Permitting Action:
❑ Renewal
❑ Renewal with Expansion
El New Discharge
® Modification(Fact Sheet should be tailored to mod request)
Note: A complete application should include the following:
• For New Dischargers, EPA Form 2A or 2D requirements, Engineering Alternatives Analysis, Fee
• For Existing Dischargers(POTW), EPA Form 2A, 3 effluent pollutant scans, 4 2m species WET
tests.
• For Existing Dischargers(Non-POTW),EPA Form 2C with correct analytical requirements based
on industry category.
Complete applicable sections below. If not applicable,enter NA.
1. Basic Facility Information
Facility Information
Applicant/Facility Name: Duke Energy Progress LLC—Cape Fear Steam Electric Plant
Applicant Address: 500 CP&L Road,Moncure,NC 27599
Facility Address: 500 CP&L Road,Moncure,NC 27599
Permitted Flow: Outfall 007 0.73 MGD Daily Maximum
Outfall 008 0.72 MGD Daily Maximum
Outfall 009— 0.005 MGD Daily Maximum
Facility Type/Waste: 100%Industrial(Ash basin clean up,remediation)
Facility Class: Grade I Physical Chemical WPCS
County: Chatham
Region Raleigh
Briefly describe the proposed permitting action and facility background: Duke Energy Progress LLC
(Permittee)has requested a permit modification and submitted a modification request on March 17,
2020.The permit is being modified to add an Emergency Spillway for the 1963/1970 inactive ash basin.
The new Emergency Spillway will be designated as Outfall 008B, it will be adjacent to Outfall 008A.
The monitoring will be waived due to unsafe conditions associated with sampling during an overflow
event.The location of new Outfall is described in Table 2.
Page 1 of 4

Table 2. Outfall 008B Location
Coordinates
Latitude:35°34'57.37"N
Longitude:-79°02'57.50"W
The new Emergency Spillway is needed to comply with the new Dam Safety regulations for ash basin
dams passed in April 2019. The current regulatory design storm has been updated from 0.5 Probable
Maximum Flood(PMF)to the full PMF.The full PMF equates to 27.5 inches of rainfall in 6-hour period.
In order to safely pass the full PMF a new auxiliary emergency overflow spillway is required to be
constructed to release stormwater to the Cape Fear River.
2. Receiving Waterbody Information:
Table 3.
Receiving Stream Index 7Q10s QA IWC
(cfs) (cfs) (7Q 10s)
Outfall 007—Unnamed tributary to Cape Fear River 18-(1) 0 0 100%
Outfalls 008—Cape Fear River 18-(1) 65 3,170 1.7%
Outfall 009—Cape Fear River 18-(1) 65 3,170 0.012%
Outfall 008A—Cape Fear River
Outfalls 001 &005—Internal Outfalls
Stream Classification: WS-IV Regional Office: Raleigh
303(d)Listed?: No USGS Topo Quad: E22SE Moncure,NC
HUC No.: 03030002 Permit Writer: Sergei Chernikov,Ph.D.
Subbasin: 03-06-07 Date: May 27, 2020
Cape Fear River Stream Statistics—2016
Drainage(mi2): -
Summer—7Q10 (cfs): 65 1
Winter—7Q10(cfs): 89 1
30Q2(cfs): 150 1
QA(cfs): 3,170 1
1. Based on USGS recommendation and data
3. Instream Monitoring
Instream monitoring may be required in certain situations, for example: 1)to verify model predictions
when model results for instream DO are within 1 mg/1 of instream standard at full permitted flow; 2)to
verify model predictions for outfall diffuser; 3)to provide data for future TMDL; 4)based on other
instream concerns. Instream monitoring may be conducted by the Permittee, and there are also
Monitoring Coalitions established in several basins that conduct instream sampling for the Permittee(in
which case instream monitoring is waived in the permit as long as coalition membership is maintained).
If applicable, summarize what instream monitoring will be proposed for this permit action: The current
permit requires instream monitoring for total arsenic,total selenium,total mercury,total chromium,
dissolved lead, dissolved cadmium, dissolved copper,dissolved zinc,total bromide, total hardness(as
CaCO3),temperature, turbidity, and total dissolved solids(TDS)at locations specified in Table 4:
Page 2 of 4

Instream sampling location descriptions are shown in Table 4.
Table 4. Instream Sampling Locations Description
Instream Sample Description Location
Upstream Outfall 008 0.9 miles upstream from Outfall 008A in Cape Fear River
Downstream Outfall 008 Approximately 250 meters downstream from Outfall 008 in
Cape Fear River
Is this facility a member of a Monitoring Coalition with waived instream monitoring(Y/N):NO
Name of Monitoring Coalition: NA
4. Antidegradation Review (New/Expanding Discharge):
The objective of an antidegradation review is to ensure that a new or increased pollutant loading will not
degrade water quality. Permitting actions for new or expanding discharges require an antidegradation
review in accordance with 15A NCAC 2B.0201. Each applicant for a new/expanding NPDES permit
must document an effort to consider non-discharge alternatives per 15A NCAC 2H.0105(c)(2). In all
cases, existing instream water uses and the level of water quality necessary to protect the existing use is
maintained and protected.
If applicable, describe the results of the antidegradation review, including the Engineering Alternatives
Analysis (EAA) and any water quality modeling results:NA
5. Antibacksliding Review:
Sections 402(o)(2)and 303(d)(4)of the CWA and federal regulations at 40 CFR 122.44(1)prohibit
backsliding of effluent limitations in NPDES permits.These provisions require effluent limitations in a
reissued permit to be as stringent as those in the previous permit,with some exceptions where limitations
may be relaxed(e.g.,based on new information,increases in production may warrant less stringent TBEL
limits, or WQBELs may be less stringent based on updated RPA or dilution).
Are any effluent limitations less stringent than previous permit(YES/NO):NO
If YES, confirm that antibacksliding provisions are not violated:NA
6.Summary of Proposed Permitting Actions:
A proposed new outfall 008B (emergency spillway)was added to the permit.
7. Public Notice Schedule:
Permit to Public Notice: 06/08/2020
Per 15A NCAC 2H .0109& .0111,The Division will receive comments for a period of 30 days following
the publication date of the public notice.Any request for a public hearing shall be submitted to the
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Director within the 30 days comment period indicating the interest of the party filing such request and the
reasons why a hearing is warranted.
8. Fact Sheet Addendum (if applicable):
Were there any changes made since the Draft Permit was public noticed(Yes/No):
If Yes, list changes and their basis below:
9. Fact Sheet Attachments (if applicable): NA
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