NC0004987_Draft Permit Signed_20200706

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Governor F �_tS)i
MICHAEL S.REGAN '�''
Secretary ` �""""`;`
S.DANIEL SMITH NORTH CAROLINA
Director Environmental Quality
July 6,2020
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 Major Modification
Permit NC0004987
Marshall Steam Station
Catawba County
Facility Class I
Dear Mr. Draovitch:
The Division has received your request to increase flow limit to 3.0 MGD for the dewatering
phase (Outfall 002) due to the need to incorporate wastewater from the remediation project.The
request has been granted. Enclosed with this letter is the modified permit. Please review this permit
carefully to ensure thorough understanding of the conditions and requirements it contains.
The draft permit modification contains the following significant changes from your current
permit:
• The flow limit for Outfall 002 (dewatering phase)was increased to 3.0 MGD. 1
Please provide any comments you have regarding the draft permit to this office by
August 12, 2020. At this time, the Division is also publishing a notice in the newspapers of general
circulation in Catawba County,inviting public comment on the Draft Modification. Following the 30-
day comment period, we will review all pertinent comments received and take appropriate action on
the permit modification.
D E Q 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
r
cKa wn
Ospol W r .urdi li irr r 919.707.9000

If you have any questions about the NPDES permit process,please contact me at the
following e-mail address: [e-mail],or telephone number. 919-707-3606.
Sincerely,
Sergei Chernikov,Ph.D.
Environmental Engineer III
Industrial NPDES Permitting Unit
cc: Central Files
NPDES Files
EPA Region IV (e-copy)
Mooresville Regional Office/Water Quality (e-copy)
Mooresville Regional Office/PWS (e-copy)
WSS/Aquatic Toxicology Unit(e-copy)

PERMIT No. NC0004987
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 Carolinas, LLC
is hereby authorized to discharge wastewater from a facility located at
Marshall Steam Station
At the intersection of NC Highway 150 and NCSR 1841
Terrell
Catawba County
to receiving waters designated as the Catawba River (Lake Norman) in the Catawba River
Basin in accordance with effluent limitations, monitoring requirements, and other
applicable conditions set forth in Parts I, II, and III hereof.
This modification shall become effective
This permit modification and authorization to discharge shall expire at midnight on
September 30, 2021.
Signed this day
D. Daniel Smith, Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 22

PERMIT No. NC0004987
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 Carolinas, LLC is hereby authorized to:
1. Continue to discharge:
• Outfall 001: once-through cooling water and intake screen backwash
• Outfall 002: treated wastewater (consisting of metal cleaning wastes, coal
pile runoff, ash transport water, storm water, low volume wastes, landfill
leachate, and FGD wet scrubber wastewater) from the ash settling basin.
• Outfall 005. Upon completion of construction, discharge from the new
lined retention basin. Basin will accept wastes from holding basin (coal
pile runoff), ash transport water, various sumps, stormwater runoff, FGD
wastewater, and various low volume wastes such as boiler blowdown, oily
waste treatment, wastes/backwash from the water treatment processes,
plant area wash down water, equipment heat exchanger water, landfill
leachate, and ash transport water. Upon completion of construction all
waste streams previously discharged to the ash basin, will be re-routed to
the new retention basin. During the transition period, wastewater from
the ash pond can also be discharged (Outfall 002).
• Outfalls 002A and 002B: yard sump overflows.
• Outfall 007: the emergency spillway of the Ash Pond. The spillway is
designed for a flood greater than 100-year event. Sampling of this spillway
is waived due to unsafe conditions associated with sampling during an
overflow event.
• Internal outfall 001/001A. Yard sump (wastewater from the yard sump 2,
the yard sump 3, the fly ash silo yard sump, and stormwater) discharging
to the retention basin.
• Internal Outfall 003: non-contact cooling water from the induced draft fan
control house to the intake for cooling water pumps.
• Internal Outfall 006: treated FGD wet scrubber wastewater to the new lined
retention basin.
• Internal Outfall 010 from Holding Basin: coal pile runoff, and stormwater
to the retention basin.
From a facility located at Duke Energy's Marshall Steam Station at the
intersection of NC Highway 150 and NCSR 1841 in Terrell, Catawba
County;
2. Discharge from said treatment works at the locations specified on the
attached map into the Catawba River (Lake Norman) which is classified
WS-IV and B CA waters in the Catawba River Basin.
Page 2 of 22

PERMIT No. NC0004987
PART I
A. (1.) Effluent Limitations and Monitoring Requirements (Outfall 001)
[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 from Outfall 001 (once-through
cooling water). Such discharges shall be limited and monitored2 by the Permittee as
specified below:
EFFLUENT DISCHARGE LIMITATIONS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location
Pump logs or
Flow, MGD Monitor& Report Daily similar Effluent
readings
Temperature 33.3 oC Daily Grab Effluent
(November 1 -June 30)
Temperature 34.4 0C Daily Grab Effluent
(July 1 - October 31)
Free Available 0.2 mg/L 0.5 mg/L Daily Grab Effluent
Chlorine 1
NOTES:
1 Once-through cooling water shall not be chlorinated. Should the facility wish to chlorinate
once-through cooling water, Division permission shall be obtained prior to
commencement of chlorination. The monitoring requirement and effluent limitations only
apply if chlorination is commenced.
2 The permittee shall submit Discharge Monitoring Reports electronically using NC
DWR's eDMR application system. Please See Special Condition A. (30.).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Based upon studies conducted by the permittee and submitted to the Division, it has been
determined pursuant to Section 316(a) of the Clean Water Act that the thermal component of
the discharge assures the protection and propagation of a balanced, indigenous population of
shellfish, fish and wildlife in the receiving water.
Page 3 of 22

PERMIT No. NC0004987
A. (2.) Effluent Limitations and Monitoring Requirements (Outfall 002 - normal
operation/decanting)
[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 from Outfall 002 (ash settling
basin discharge - decanting the free water above the settled ash layer that does
not involve mechanical disturbance of the ash). Such discharges shall be limited
and monitored4 by the Permittee as specified below:
DISCHARGE LIMITATIONS MONITORING REQUIREMENTS
EFFLUENT CHARACTERISTICS Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location'
Pump logs
Flow, MGD Monitor& Report Weekly or similar Effluent
I _
readings
Oil and Grease 9.0 mg/L I 12.0 mg/L Monthly Grab Effluent
Total Suspended Solids2 20.0 mg/L 50.0 mg/L Monthly Grab Effluent
Total Arsenic Weekly Grab Effluent
Total Copper 1.0 mg/L3 1.0 mg/L3 Weekly Grab Effluent
Total Iron 1.0 mg/L3 1.0 mg/L3 Weekly Grab Effluent
Total Mercury6 Weekly Grab Effluent
Total Selenium Weekly Grab Effluent
Turbidity5, NTU Monthly Grab Effluent
Nitrate/nitrite as N, mg/L Quarterly Grab Effluent
Bromide, mg/L Monthly Grab Effluent
Total Hardness, mg/L Monthly Grab Effluent
Total Nitrogen Monitor& Report Quarterly Grab Effluent
(NO2+NO3+TKN), mg/L
Total Phosphorus, mg/L Monitor& Report Quarterly Grab Effluent
Chronic Toxicity See Part I, Section A. (18.) Monthly Grab Effluent
pH, Between 6.0 and 9.0 Standard Monthly Grab Effluent
Units
NOTES:
1 Effluent sampling shall be conducted at the discharge from the ash settling basin prior to
mixing with any other waste stream(s).
2 The facility shall continuously monitor TSS concentration when the decanting process
commences and the decanting pump shall be shut off automatically when one half of the
Daily Maximum limit (15 minutes average) is exceeded. Pumping will be allowed to continue
if interruption might result in a dam failure or damage. The continuous TSS monitoring
only required when the pumps are employed for decanting.
3 The limits for total copper and total iron only apply when chemical metal cleaning
wastewaters are being discharged.
4 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's
eDMR application system. Please See Special Condition A. (30.).
5 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
Page 4 of 22

PERMIT No. NC0004987
existing turbidity level in the receiving waterbody was not increased. All data shall be
reported on the DMRs. (See 15A NCAC 2B .0211 (21)).
NTU - Nephelometric Turbidity Unit.
6 The facility shall use EPA method 1631E.
7 The facility shall continuously monitor pH when the decanting process commences and the
decanting pump shall be shut off automatically when 15 minutes running average pH falls
below 6.1 standard units or rises above 8.9 standard units. Pumping will be allowed to
continue if interruption might result in a dam failure or damage. The continuous pH
monitoring only required when the pumps are employed for decanting.
When the facility commences the ash pond/ponds decanting, 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 Mooresville Regional
Office, in writing, within seven calendar days of installing additional physical-chemical
treatment at this Outfall.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
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 15A, Subchapter 2K.
The facility shall use a floating pump station with free water skimmed from the basin
surface using an adjustable weir.
By November 1, 2018 there shall be no discharge of pollutants in fly ash transport water.
This requirement only applies to fly ash transport water generated after November 1,
2018.
In accordance with the N.C.G.S. § 130A-309.210, by December 31, 2019, the facility
shall convert to the disposal of dry bottom ash, as defined in the Coal Ash Management
Act ("CAMA"). This requirement only applies to bottom ash transport water generated
after 12/31/2019 or a new date as HB630 may be amended.
By November 1, 2021 there shall be no discharge of pollutants in bottom ash transport
water. This requirement only applies to bottom ash transport water generated after
November 1, 2021. Beginning on November 1, 2021, the permittee will comply with the
Steam Electric Effluent Limitations Guidelines for bottom ash wastewater (40 C.F.R.
423) in effect on December 1, 2020.
The limits and conditions in Section A. (3.) of the permit apply when water in the ash
settling basin is lowered below the three feet trigger mark. The facility shall notify DWR
Complex NPDES Permitting Unit and DWR Mooresville Regional Office, in writing, seven
calendar days prior to the commencement of the decanting.
Page 5 of 22

PERMIT No. NC0004987
A. (3.) Effluent Limitations and Monitoring Requirements (Outfall 002 -
dewatering phase)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the commencement date of the dewatering operation
and lasting until expiration, the Permittee is authorized to discharge from Outfall 002
Ash Settling Basin Discharge (Dewatering- removing the interstitial water). Such
discharges shall be limited and monitored4 by the Permittee as specified below:
DISCHARGE LIMITATIONS MONITORING REQUIREMENTS
EFFLUENT CHARACTERISTICS Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location'
Pump logs
Flow 3.0 MGD Weekly or similar Effluent
readings
Oil and Grease 9.0 mg/L 12.0 mg/L Monthly Grab Effluent
Total Suspended Solids2 20.0 mg/L 50.0 mg/L Monthly Grab Effluent
Total Arsenic 139.1 µg/L ! 695.4 µg/L Weekly Grab Effluent
Total Copper 1.0 mg/L3 1.0 mg/L3 Weekly Grab Effluent
Total Iron 1.0 mg/L3 1.0 mg/L3 Weekly Grab Effluent
Total Mercury6 Weekly Grab Effluent
Total Selenium Weekly Grab Effluent
Turbidity5, NTU Monthly Grab Effluent
Nitrate/nitrite as N, mg/L Quarterly Grab Effluent
Bromide, mg/L Monthly Grab Effluent
Total Hardness, mg/L Monthly Grab Effluent
Total Nitrogen Monitor& Report Quarterly Grab Effluent
(NO2+NO3+TKN), mg/L
Total Phosphorus, mg/L Monitor& Report Quarterly Grab Effluent
Chronic Toxicity See Part I, Section A. (18.) Monthly Grab Effluent
pH7 Between 6.0 and 9.0 Standard Monthly Grab Effluent
Units
NOTES:
1 Effluent sampling shall be conducted at the discharge from the ash settling basin prior to
mixing with any other waste stream(s).
2 The facility shall continuously monitor TSS concentration when the dewatering process
commences and the dewatering pump shall be shut off automatically when one half of
the Daily Maximum limit (15 minutes average) is exceeded. Pumping will be allowed to
continue if interruption might result in a dam failure or damage. The continuous TSS
monitoring only required when the pumps are employed for dewatering.
3 The limits for total copper and total iron only apply when chemical metal cleaning
wastewaters are being discharged.
4 The permittee shall submit Discharge Monitoring Reports electronically using NC
DWR's eDMR application system. Please See Special Condition A. (30.).
5 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)).
Page 6 of 22

PERMIT No. NC0004987
NTU - Nephelometric Turbidity Unit.
6 The facility shall use EPA method 1631E.
7 The facility shall continuously monitor pH when the dewatering process commences
and the dewatering pump shall be shut off automatically when 15 minutes running
average pH falls below 6.1 standard units or rises above 8.9 standard units. Pumping
will be allowed to continue if interruption might result in a dam failure or damage. The
continuous pH monitoring only required when the pumps are employed for dewatering.
When the facility commences the ash pond/ponds 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 Mooresville Regional
Office, in writing, within seven calendar days of installing additional physical-chemical
treatment at this Outfall.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
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.
By November 1, 2018 there shall be no discharge of pollutants in fly ash transport water.
This requirement only applies to fly ash transport water generated after November 1,
2018.
In accordance with the N.C.G.S. § 130A-309.210, by December 31, 2019, the facility
shall convert to the disposal of dry bottom ash, as defined in the Coal Ash Management
Act ("CAMA"). This requirement only applies to bottom ash transport water generated
after 12/31/2019 or a new date as HB630 may be amended.
By November 1, 2021 there shall be no discharge of pollutants in bottom ash transport
water. This requirement only applies to bottom ash transport water generated after
November 1, 2021. Beginning on November 1, 2021, the permittee will comply with the
Steam Electric Effluent Limitations Guidelines for bottom ash wastewater (40 C.F.R.
423) in effect on December 1, 2020.
The facility shall notify DWR Complex NPDES Permitting Unit and DWR Mooresville
Regional Office, in writing, seven calendar days prior to the commencement of the
dewatering.
Page 7 of 22

PERMIT No. NC0004987
A. (4.) Effluent Limitations and Monitoring Requirements (Outfall 002A)
[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 from Outfall 002A (yard sump #1
overflows). Such discharges shall be limited and monitored2 by the Permittee as
specified below:
EFFLUENT DISCHARGE LIMITATIONS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location'
Flow, MGD Per discharge Estimate Effluent
event
pH Between 6.0 and 9.0 Standard Per discharge Grab Effluent
Units event
Total Suspended Solids 30.0 mg/L 100.0 mg/L Per discharge Grab Effluent
event
Oil and Grease 15.0 mg/L 20.0 mg/L Per discharge Grab Effluent
event
Total Iron, mg/L Per discharge Grab Effluent
event
NOTES:
1 Effluent samples shall be collected at a point upstream of the discharge to the Catawba River.
2 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's
eDMR application system. Please See Special Condition A. (30.).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
All flows shall be reported on monthly DMRs. Should no flow occur during a given
month, the words "No Flow" shall be clearly written on the front of the DMR. All samples
shall be of a representative discharge.
Page 8 of 22

PERMIT No. NC0004987
A. (5.) Effluent Limitations and Monitoring Requirements (Outfall 002B)
[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 from Outfall 002B (yard sump #2
overflows). Such discharges shall be limited and monitored2 by the Permittee as
specified below:
EFFLUENT DISCHARGE LIMITATIONS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location'
Flow, MGD Per discharge Estimate Effluent
event
pH Between 6.0 and 9.0 Standard Per discharge Grab Effluent
Units event
Total Suspended Solids 30.0 mg/L 100.0 mg/L Per discharge Grab Effluent
event
Oil and Grease 15.0 mg/L 20.0 mg/L Per discharge Grab Effluent
event
Total Iron, mg/L Per discharge Grab Effluent
event
NOTES:
1 Effluent samples shall be collected at a point upstream of the discharge to the Catawba River.
2 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's
eDMR application system. Please See Special Condition A. (30.).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
All flows shall be reported on monthly DMRs. Should no flow occur during a given
month, the words "No Flow" shall be clearly written on the front of the DMR. All samples
shall be of a representative discharge.
Page 9 of 22

PERMIT No. NC0004987
A. (6.) Effluent Limitations and Monitoring Requirements (Internal Outfall 003)
[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 from Internal Outfall 003 (non-
contact cooling water from the induced draft fan control house). Such discharges
shall be limited and monitored2 by the Permittee as specified below:
EFFLUENT DISCHARGE LIMITATIONS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location
Flow, MGD Semi-annually Estimate Effluent
Temperature, 0C Semi-annually Grab Effluent
Total Residual Semi-annually Grab Effluent
Chlorine', µg/L
Free Available 0.2 m L 0.5 m L Semi-annually Grab Effluent
Chlorine' g/ g/
pH Between 6.0 and 9.0 Standard Semi-annually Grab Effluent
Units
NOTES:
1 Monitoring requirements apply only if chlorine is added to the cooling water. Neither free
available chlorine nor total residual chlorine may be discharged from any unit for more than
two hours in any one day and not more than one unit in any plant may discharge free
available chlorine or total residual chlorine at any one time.
2 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's
eDMR application system. Please See Special Condition A. (30.).
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Limitations shall be met at the discharge point.
Page 10 of 22

PERMIT No. NC0004987
A. (7.) Effluent Limitations and Monitoring Requirements (Internal Outfall 006)
[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 from Internal Outfall 006 (treated
FGD wet scrubber wastewater to retention basin). Such discharges shall be limited
and monitored2 by the Permittee as specified below:
EFFLUENT DISCHARGE LIMITATIONS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location'
Pump logs or
Flow, MGD Monitor&Report Monthly similar Effluent
readings
Total Arsenic 8.0 µg/L4 11.0 µg/L4 Quarterly Grab Effluent
Total Mercury3, ng/L 356.0 ng/L4 788.0 ng/L4 Quarterly Grab Effluent
Total Selenium 12.01444 23.0 pg/L4 Quarterly Grab Effluent
Nitrate/nitrite as N 4.4 mg/L4 17.0 mg/L4 Quarterly Grab Effluent
Between 6.0 and 9.0 Standard pH Quarterly Grab Effluent
Units
NOTES:
1 Sample Location: E - Effluent samples shall be collected prior to the commingling with
other waste streams.
2 The permittee shall submit Discharge Monitoring Reports electronically using NC
DWR's eDMR application system. Please See Special Condition A. (30.).
3 The facility shall use EPA method 1631E.
4 Beginning on November 1, 2021, the permittee shall comply with the Steam Electric
Effluent Limitations Guidelines for FGD wastewater (40 C.F.R. 423) in effect on December
1, 2020.
All flows shall be reported on monthly DMRs. Should no flow occur during a given
month, the words "No Flow" shall be clearly written on the front of the DMR. All samples
shall be of a representative discharge.
Page 11 of 22

PERMIT No. NC0004987
A. (8.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 005)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning upon commencement of operations and lasting until
expiration, the Permittee is authorized to discharge from Outfall 005 - Retention
Basin discharge. Such discharges shall be limited and monitored' by the Permittee as
specified below:
EFFLUENT CHARACTERISTICS DISCHARGE LIMITATIONS MONITORING REQUIREMENTS
Monthly Daily Measurement Sample Sample
Average Maximum Frequency2 Type Location
Flow, MGD Weekly Instantaneous Effluent
or Estimate
pH Between 6.0 and 9.0 Monthly Grab Effluent
standard units
TSS 30.0 mg/L 50.0 mg/L Monthly Grab Effluent
Oil and Grease 15.0 mg/L 20.0 mg/L Monthly Grab Effluent
Fluoride, mg/L Monthly Grab Effluent
Total Mercury2, ng/L Monthly Grab Effluent
Total Silver, µg/L Monthly Grab Effluent
Total Iron3 1.0 mg/L 1.0 mg/L Monthly Grab Effluent
Total Zinc, µg/L Monthly Grab Effluent
Total Arsenic, µg/L Monthly Grab Effluent
Total Cadmium, µg/L Monthly Grab Effluent
Total Chromium, µg/L Monthly Grab Effluent
Total Copper3 68.8 µg/L 76.8 µg/L Monthly Grab Effluent
Total Lead, µg/L Monthly Grab Effluent
Total Nickel, µg/L Monthly Grab Effluent
Total Selenium, µg/L Monthly Grab Effluent
Total Nitrogen Quarterly Grab Effluent
(NO2 + NO3 +TKN), mg/L
Total Phosphorus, mg/L Quarterly Grab Effluent
Sulfates, mg/L Monthly Grab Effluent
Chlorides, mg/L Monthly Grab Effluent
Bromide, mg/L Monthly Grab Effluent
TDS, mg/L Monthly Grab Effluent
Total Hardness, mg/L Monthly Grab Effluent
Temperature, 'DC Monthly Grab Effluent
Conductivity, µmho/cm Monthly Grab Effluent
Chronic Toxicity4 Monthly Grab Effluent
Notes:
1. The permittee shall submit Discharge Monitoring Reports electronically using NC
DWR's eDMR application system. Please See Special Condition A. (30.).
2. The facility shall use EPA method 1631E.
3. The limits for total copper and total iron only apply when chemical metal cleaning
wastewaters are being discharged.
4. Whole Effluent Toxicity shall be monitored by chronic toxicity (Ceriodaphnia) P/F
at 23.0%, see Special Condition A. (18.).
The facility shall submit EPA Form 2C for Outfall 005 no later than 180 days
from the commencement of the discharge. The facility shall notify DWR/NPDES
Complex Permitting, in writing, 30 days prior to the commencement of the
discharge from this outfall.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Page 12 of 22

PERMIT No. NC0004987
A. (9.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 007)
[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 from outfall 007- Emergency
spillway of the ash basin. Such discharges shall be limited and monitored' by the
Permittee as specified below:
EFFLUENT CHARACTERISTICS DISCHARGE LIMITATIONS MONITORING REQUIREMENTS
Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location
Flow, MGD Waived Estimate Effluent
pH Waived Grab Effluent
TSS Waived Grab Effluent
Oil and Grease Waived Grab Effluent
The emergency spillway is designed for a flood greater than 100-year event in Catawba
County. Sampling of this spillway is waived due to unsafe conditions associated with
sampling during an overflow event.
Monitoring is required for any other rain event that might trigger a discharge.
A. (10.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Internal
Outfall 010)
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning upon commencement of operation of the yard sump and
lasting until expiration, the Permittee is authorized to discharge from Internal outfall
010 - Coal yard runoff and stormwater. Such discharges shall be limited and
monitored' by the Permittee as specified below:
EFFLUENT CHARACTERISTICS DISCHARGE LIMITATIONS MONITORING REQUIREMENTS
Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location
Flow, MGD Quarterly Estimate Effluent
pH Quarterly Grab Effluent
TSS Quarterly Grab Effluent
Oil and Grease Quarterly Grab Effluent
Notes:
1. The permittee shall submit Discharge Monitoring Reports electronically using
NC DWR's eDMR application system. Please See Special Condition A. (30.).
Page 13 of 22

PERMIT No. NC0004987
A. (11.) ADDITIONAL CONDITIONS AND DEFINITIONS
[NCGS 143-215.3 (a) (2) and NCGS 143-215.66]
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 1631E).
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 means 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
method approved by the Division.
7. The term "FGD wet scrubber wastewater" means wastewater resulting from the use of the
flue-gas desulfurization wet scrubber.
A. (12.) TOXICITY RE-OPENER CONDITION
[NCGS 143-215.3 (a) (2) and NCGS 143-215.66]
This permit shall be modified, or revoked and reissued to incorporate toxicity limitations and
monitoring requirements in the event toxicity testing or other studies conducted on the effluent
or receiving stream indicate that detrimental effects may be expected in the receiving stream as
a result of this discharge.
A. (13.) 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.
A. (14.) POLYCHLORINATED BIPHENYL COMPOUNDS
[40 CFR 423]
There shall be no discharge of polychlorinated biphenyl compounds such as those commonly
used for transformer fluid.
A. (15.) BIOCIDE CONDITION
[NCGS 143-215.1]
The permittee shall not use any biocides except those approved in conjunction with the permit
application. The permittee shall notify the Director in writing not later than ninety (90) days
prior to instituting use of any additional biocide used in cooling systems which may be toxic to
aquatic life other than those previously reported to the Division of Water Resources. Such
notification shall include completion of Biocide Worksheet Form 101 and a map locating the
discharge point and receiving stream. Completion of Biocide Worksheet Form 101 is not
Page 14 of 22

PERMIT No. NC0004987
necessary for those outfalls containing toxicity testing. Division approval is not necessary for the
introduction of new biocides into outfalls currently tested for whole effluent toxicity.
A. (16.) INTAKE SCREEN BACKWASH
[NCGS 143-215.1 (b)]
Continued intake screen backwash discharge and overflow from the settling basin are permitted
without limitations or monitoring requirements.
A. (17.) BEST MANAGEMENT PRACTICES
[NCGS 143-215.1 (b)]
It has been determined from information submitted that the plans and procedures in place at
Marshall Steam Station are equivalent to that of a Best Management Practice (BMP).
A. (18.) CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT—OUTFALL 002 AND OUTFALL 005
[15A NCAC 02B .0200 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 23.0% for
decanting (Outfall 002) and Outfall 005, and 2.6% for dewatering (Outfall 002).
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 monthly test procedure 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, North Carolina 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
Page 15 of 22

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L86170000N •0N dAws

PERMIT No. NC0004987
treatment should be considered in relation to the small differences in effluent quality realized
between the two methods.
It has been demonstrated that the presence of ions of copper, iron, nickel, and zinc in the ash
pond waters was not measurably increased during the ash pond equivalency demonstration at
the Duke Energy's Marshall Steam Station. Therefore, when the following conditions are
implemented during metal cleaning procedures, effective treatment for metals can be obtained
at this facility:
(1) Large ash basin providing potential reaction volumes.
(2) Well-defined shallow ash delta near the ash basin influent.
(3) Ash pond pH of no less than 6.5 prior to metal cleaning waste addition.
(4) Four days retention time in ash pond with effluent virtually stopped.
(5) Boiler volume less than 86,000 gallons.
(6) Chemicals for cleaning to include only one or more of the following:
(a) Copper removal step- sodium bromate, NaBrO3; ammonium carbonate, (NH4)2CO3; and
ammonium hydroxide, NH4OH.
(b) Iron removal step-hydrochloric acid, HC1; and ammonium bifluoride, (NH4)BF2 and
proprietary inhibitors.
(7) Maximum dilution of wastes before entering ash pond 6 to 1.
(8) After treatment of metal cleaning wastes, if monitoring of basin effluents as required by the
permit reveals discharges outside the limits of the permit, the permittee will re-close the
basin discharge, conduct such in-basin sampling as necessary to determine the cause of
nonconformance, will take appropriate corrective actions, and will file a report with EPA
including all pertinent data.
A. (21.) FLOATING MATERIALS
[NCGS 143-215.1 (b)]
The Permittee shall report all visible discharges of floating materials, such as an oil sheen, to the
Director when submitting DMRs.
A. (22.) CHEMICAL DISCHARGES
[NCGS 143-215.1 (b)]
Discharge of any product registered under the Federal Insecticide, Fungicide, and Rodenticide
Act to any waste stream which may ultimately be released to lakes, rivers, streams or other
waters of the United States is prohibited unless specifically authorized elsewhere in this permit.
Discharge of chlorine from the use of chlorine gas, sodium hypochlorite, or other similar
chlorination compounds for disinfection in plant potable and service water systems and in
sewage treatment is authorized. Use of restricted use pesticides for lake management purposes
by applicators licensed by the N.C. Pesticide Board is allowed.
A. (23.) PRIORITY POLLUTANT ANALYSIS-OUTFALL 002
[NCGS 143-215.1 (b)]
The Permittee shall conduct a priority pollutant analysis (in accordance with 40 CFR Part 136)
once per permit cycle at outfall 002 and submit the results with the application for permit
renewal.
A. (24.) WAIVERS
[NCGS 143-215.1 (b)]
Page 17 of 22

PERMIT No. NC0004987
Nothing contained in this permit shall be construed as a waiver by permittee or any right to a
hearing it may have pursuant to State or Federal laws or regulations.
A. (25.) STRUCTURAL INTEGRITY INSPECTIONS OF ASH POND DAM
[15A NCAC 02K.0208]
The facility shall meet the dam design and dam safety requirements per 15A NCAC 2K.
A. (26.) CLEAN WATER ACT SECTION 316(a) THERMAL VARIANCE
[40 CFR 125, Subpart H]
The thermal variance granted under Section 316(a) terminates on expiration of this NPDES
permit. Should the permittee wish a continuation of its 316(a) thermal variance beyond the
term of this permit, reapplication for such continuation shall be submitted in accordance with
40 CFR Part 125, Subpart H and Section 122.21(m)(6) not later than 180 days prior to permit
expiration. Reapplication shall include a basis for continuation such as a) plant operating
conditions and load factors are unchanged and are expected to remain so for the term of the
reissued permit; b) there are no changes to plant discharges or other discharges in the plant
site area which could interact with the thermal discharges; and c) there are no changes to the
biotic community of the receiving water body which would impact the previous variance
determination.
The next 316(a) studies shall be performed in accordance with the Division of Water Resources
approved plan. The temperature analysis and the balanced and indigenous study plan shall
conform to the specifications outlined in 40 CFR 125 Subpart H, the EPA's Draft 316(a)
Guidance Manual, dated 1977, and the Region 4 letter to NCDENR, dated June 3, 2010. EPA
shall be provided an opportunity to review the plan prior to the commencement of the study.
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
1621 Mail Service Center
Raleigh, NC 27699-1621
A. (27.) CLEAN WATER ACT SECTION 316 (B)
[40 CFR 125.95]
The permittee shall comply with the Cooling Water Intake Structure Rule per 40 CFR 125.95.
The permittee shall submit all the materials required by the Rule with the next renewal
application.
Page 18 of 22

PERMIT No. NC0004987
A. (28.) FISH TISSUE MONITORING NEAR ASH POND DISCHARGE—OUTFALL 002
[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 the monitoring is to evaluate potential uptake of
pollutants by fish tissue near the Ash Pond discharge. The parameters analyzed in fish tissue
shall be 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
1621 Mail Service Center
Raleigh, NC 27699-1621
A. (29.) INSTREAM MONITORING
[15A NCAC 02B.0500 ET SEQ.]
The facility shall conduct monthly instream monitoring (approximately one mile upstream and
approximately one mile downstream of the ash pond discharge) for total arsenic, total selenium,
total mercury, total chromium, dissolved lead, dissolved cadmium, dissolved copper, dissolved
zinc, total bromide, total hardness (as CaCO3), 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. This condition becomes effective on June 1, 2018.
A. (30.) 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
Page 19 of 22

PERMIT No. NC0004987
1. Reporting Requirements [Supersedes Section D. (2.) and Section E. (5.1 (all
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 DEQ / 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.
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:
Page 20 of 22

PERMIT No. NC0004987
https://www.federalregister.gov/documents/2015/10/22/2015-24954/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:
http://deq.nc.gov/about/divisions/water-resources/edmr
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B.
[11.) (d)1
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."
Page 21 of 22

PERMIT No. NC0004987
5. Records Retention [Supplements Section D. (6.)1
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 may be extended by request of the Director at any
time [40 CFR 122.41].
A. (31.) COMPLIANCE BOUNDARY
[15A NCAC 02L.0 107]
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.
Page 22 of 22