NC0003425_Draft Permit Renewal_20170121

Water Resources
ENVIRONMENTAL QUALITY
Mr Mike Mosley, Plant Manager
Duke Energy Progress
Roxboro Steam Electric Plant
1700 Dunnaway Rd
Semora, North Carolina 27343
ROY COOPER
Goeemol
MICHAEL S. REGAN
secr elor y
S. JAY ZIMMERMAN
nr,ech,
January 21, 2017
Subject Draft NPDES Permit Renewal
Permit NC0003425
Roxboro Steam Electric Plant
Person County
Class II Facility
Dear Mr. Mosley al for
ur facility. A
Enclosed with this letter is a copy of the revised draf Division is posting a seconit renew d public notice due tonotice fa r
this draft permit was posted on August 24, 201w thisrevie
technical error that resulted in publishmgof the notice in the incorrect newspaer emen lit contains There -
draft carefully to ensure thorough understandmg of the conditions andequlr
are several changes from the existing permit, including the following
• Effluent Limits and Monitoring Requirements were added for outfall 002 for the dewatering
phase of the ash pond
Outfall 001 was reinstated in the permit to monitor the discharge of seeps and stormwater.
•
Monitoring for beryllium, vanadium, antimony and silver were eliminated for outfall 010.
•• Outfall 011 was added to the permit for the discharge of a proposed FGD treatment system
• Limits for arsenic, selenium, mercury and nitrate/nitrite were added for outfall 010 and 011 as
per 40 CFR 423.
Special condition A (8) Effluent Limits and Monitoring Requirements (Outfall 008) was added or
•the expansion of the wastewater treatment system to 0.025 MGD
• The NC 2007-2014 Water Quality Standard (WQS) Triennial Review was approved by the NC
Environmental Management Commission (EMC) on November 13, 2014. The US EPA
subsequently approved the WQS revisions on April 6, 2016 with some exceptions, one bein
er, copper and zinc in adition, the totalhe
disapproval of action level policy
iron�and manganese were deleted from the NC water
metal aquatic life criteria for
quality standards rules implement the new
The NC Division of Water Resources NPDPermitting
noticed after April 6u 2016 required
new standards for
dissolved metal standards in all permits p
most metals include acute standards Fur als, and seven metals have hardness -dependent
re
dness-dependent
expressed as the dissolved form of
the inequations The permit includes the requirement to sample for hardness at mstream stations 4C
and 4D.
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919 807 6300

• A reasonable potential analysis (RPA) was performed for outfall 003 utilizing the new standards
As a result of the RPA the following changes were incorporated to the permit
o Monthly monitoring for total arsenic, total thallium, and chloride.
• Special Condition A (14) was eliminated from the permit The cooling water blowdown can be
discharged to the ash pond or to the discharge canal
• Special Condition A (28) was added to the permit regarding the submittal of all the required
information under 40 CFR 125 95 with the next permit application.
• Special Condition A (31) was added to the permit describing requirements for electronic
submittal of all discharge monitoring reports (DMRs)
• The following special conditions were added to the permit to be consistent with other Duke
Energy permits A (21) Applicable State Law, A (22) PCB Prohibition, A (26) Ash Pond closure,
A (30) Biocides, A (32) Additional Conditions and Definitions
This draft permit includes the following modifications from the draft issued in October
• Supplement to Cover Sheet was revised to include three new outfalls, two for proposed low
volume waste treatment systems and one for the oveiflow from one of the treatment basins
Outfalls 012A and 012B replace cutfall 012 Outfall 012C is the overflow from basm 012B
• Condition A (2) Effluent Limitations and Monitoring Requirements for the ash basm -
monitoring was added for arsenic, molybdenum, and chromium In addition, a statement was
added with the requirement to use physical/ chemical treatment during dewatermg.
• Condition A (2) & A (3) Effluent Limitations and Monitoring Requirements for the ash basm-
Statement regarding no discharge of fly ash was modified to read that no discharge of fly ash is
allowed The statement pertaining to the schedule of compliance with the ELG for zero discharge
of bottom ash was corrected to read April 30, 2021 instead of November 1, 2018.
• Condition A (10) & A (11) Effluent Limitations and Monitoring Requirements for the FGD -
footnote 3 was corrected to read December 31, 2023
• Turbidity sampling was elimmatrd from internal outfall 002 Turbidity monitoring is included at
outfall 003
• Condition A (6) Effluent Linmtatons and Monitoring Requirements outfall 006.
o Oil and Grease limits were added since it discharges truck wash waters
o The RPA was revised, as a result limits for total selenium were added
• Condition A (4) Effluent Limitat_ons and Monitoring Requirements for outfall 003:
o Footnote 4 was modified to include a statement regarding the addition of temperature
limits if the facility is not in compliance with the temperature water quality standard
o Reporting of the temperature at the after bay station was added to the monitoring
requirements for outfall 003, reporting of temperature at 4C, 41) was eliminated
o The RPA was revised and limits for thallium were added
• Condition A (18) Temperature Requirements - temperature reporting requirements were
modified
• Condition A. (8) Effluent Liimitatons and Monitoring Requirements for outfall 008 - monitoring
requirements were modified to require quarterly monitoring for one year after the new plant
start operations, annual monitoring is required after one year of quarterly monitoring
• Two new internal outfalls (Outfall 012A and 012B) were added to the permit for the two
proposed retention basins for the treatment of low volume wastes that are now sent to the ash
basm Duke will build two separate wastewater treatment systems to handle the wastes that go to
the ash pond These ponds will be in different locations within the site and will require each a
separate outfall into the effluent channel.
• A table including a list of the seeps locations was added to Condition A. (15)
Concurrent with this notification the Division is publishing a notice in a newspaper having circulation in
the general Person County area, soliciting public comments on this permit draft. Please provide any
_2
L

comments you may have to the DEQ - DWR, NPDES Program no later than 30 days after receiving this
draft permit.
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 [phone] or by email at teresa rodriguez®ncdenr gov.
Sincerely,
&Ati 61-1
Teresa Rodriguez
NPDES Complex Permitting Unit
cc- NPDES Files
EPA Region 4 (e -copy)
Raleigh Regional Office / Water Quality Program (e -copy)
Raleigh Regional Office / Public Water Supply (e -copy)
3

Permit NC0003425
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-2151, 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
Roxboro Steam Electric Generating Plant
1700 Dunnaway Road, Semora
Person County
to receiving waters designated as Hyco Reservoir in the Roanoke River Basin in accordance with effluent
limitations, monitoring requirements, and other conditions set forth in Parts I, II, III and IV hereof
This permit shall become effective
This permit and the authorization to discharge shall expire at midnight on
Signed this day
S. Jay Zimmerman, P.G.
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 29

Permit NC0003425
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked.
As of this permit 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 Continue to operate the following systems located at Roxboro Steam Electric Generating Plant off
NCSR 1377 near Roxboro in Person County
■ Outfall 001. Continue to discharge stormwater, rail runoff and seeps from the ash landfill into Hyco
Reservoir
■ Ash Pond Treatment System (Internal Outfall 002). Continue to discharge ash transport water, low
volume wastewater, runoff from the ash landfill, dry,fly asl�handling system wash water, ash silo
wash water, storm water runoff, coolmg tower blowdown from unit number 4, and domestic
sewage treatment plant effluent Effluent from the ash pond discharges to the heated water
discharge canal, and is ultimately released into Hyco Reservoir through Outfall 003.
■ Heated Water Discharge Canal System (Outfall 003). Continue to discharge once -through cooling
water, stormwater runoff, flue gas desulfurization treated wastewater, flue gas desulfurization
cooling water, seepage from ash pond dam, anhydrous ammonia testing waters and emergency
flows (until construction of low volume wastes treatment system), and effluent from the ash pond
(Outfall 002) Upon construction, discharge the effluent from the low volume waste treatment
systems (Outfall 012A and 012B), and yard sump overflow to the heated discharge canal This
outfall discharges to Hyco Reservoir.
■ Cooling Tower Blowdown System (Internal Outfall 005) Continue to discharge cooling tower
blowdown from unit number 4 into the ash transport system, and ultimately into the ash pond
(Outfall 002), upon construction of the 13Nwi volume waste treatment system discharge to the low
volume wastewater treatment system or into the discharge canal
• Coal Pile Runoff Treatment System (Cutfal1006). Continue to discharge runoff from the coal pile
and other coal handling areas, -runoff from the limestone and emergency gypsum stack, raw water
tank drainage, mcidental leakage from absorbent seals, and the truck wheel wash water These
waters afe routed to a retention pond for treatment by neutralization, sedimentation, and
equalization prior to being discharged directly into Hyco Reservoir
■ Domestic Wastewater Treatment System (Internal Outfall 008). Continue to discharge effluent
from the domestic treatment system into the ash pond or the low volume waste treatment system
(Outfall 012) upon completion of construction.
■ Chemical Metal Cleaning Treatment System (Internal Outfall 009) Continue to discharge
chemical metal cleaning wastes into the ash pond or the low volume waste treatment system
(Outfall 012) upon completion of construction
■ Flue Gas Desulfurization Treatment System (Internal Outfall 010). Continue to operate a FGD wet
scrubber treatment system consisting a settling pond and a bioreactor, discharging into the
discharge canal
■ Flue Gas Desulfurization Treatment System (Internal Outfall 011). Upon completion of
construction operate a Flue Gas Desulfurization System discharging to the low volume waste
treatment system (outfall 012B) or the discharge canal
■ Low Volume Wastes Treatment System (Internal Outfall 012A). Upon completion of construction
of a waste treatment system discharge landfill leachate, silo wash water, contact and non -contact
storm water runoff into the discharge canal
■ Low Volume Wastes Treatment System (Internal Outfall 012B). Upon completion of construction
of construction of a low volume waste treatment system discharge low volume wastes, metal
cleaning wastes, ash silo wash water, cooling water from Unit 4, anhydrous ammonia testing waters
Page 2 of 29

Permit NC0003425
and emergency flows, domestic sewage treatment plant effluent, coolmg tower blowdown and
storm water runoff into the discharge canal
■ Emergency overflow from low volume wastewater treatment system (outfall 012C). Upon
completion of construction of a wastewater treatment system discharge emergency overflow from
basm 12B to Hyco Reservoir.
2 Discharge from said treatment works and/or outfalls at the locations specified on the attached map
into the Hyco Reservoir, classified as WS -V & B waters in the Roanoke River Basin
Page 3 of 29

Permit NC0003425
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 (Stormwater and seeps). Such discharges shall be hmrted and
monitored' by the Permittee as specified below
EFFLUENT CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Location
Flow, MGD
Monthly/ Quarterl3
Estimate
Effluent
H2
Monthly/ Quarterl3
Grab
Effluent
TSS
30 0 m /L 100 0 m /L
Monthl /Quarterly3
Grab
Effluent
Oil and Grease
15.0 m /L 20 0 m /L
Monthl /Quarterl 3
Grab
Effluent
Fluoride
18 m /L 18 m /L
Monthly/ Quarterl3
Grab
Effluent
Total Arsenic
10 µ /L 10 µ /L
Monthly/ Quarterl3
Grab
Effluent
Total Copper, µ /L
Monthly/ Quarterl3
Grab
Effluent
Total Antimony, µ /1
Monthly/ Quarterl3
Grab
Effluent
Total Lead, µ /L
Monthly/ Quarterl3
Grab
Effluent
Total Selenium
5 µ /L 56 µ /L
Monthly/ Quarterl3
Grab
Effluent
Total Barium, m /L
Monthly/ Quarterl3
Grab
Effluent
Total Iron, µ /L
Monthly/ Quarterl3
Grab
Effluent
Total Manganese, 4 /L
Monthly/ Quarterl3
Grab
Effluent
Total Zinc, µ /L
Monthly/ Quarterl3
Grab
Effluent
Total Nickel, µ /L
Monthly/ Quarterl3
Grab
Effluent
Total Mercury, n /l
Monthly/ Quarterl3
Grab
Effluent
Chlorides, m /L
Monthly/ Quarterl3
Grab
Effluent
Nitrate/Nitrite as N
Monthly/ Quarterl3
Grab
Effluent
Sulfates
250 m /L 250 m /L
Monthly/ Quarterl3
Grab
Effluent
Total Dissolved Solids,
m /L
Monthly/Quarterly3
Grab
Effluent
Hardness -Total as
[CaCO3 or Ca + Mg)] mg/ L
Monthly/Quarterly3
Grab
Effluent
µmho/cm
Monthly/ Quarterl3
Grab
Effluent
-Conductivity,
Acute ToXjCjty4
Monthly/ Quarterl3
Grab
Effluent
NntPs.
1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system See Special Condition A (31)
2 The pH shall not be less than 6 0 standard units nor greater than 9 0 standard units
3 The facility shall conduct monthly sampling from the effective date of the pernut After one year from
the effective date of the permit the morntcring will be reduced to quarterly
4 Acute Toxicity (Amephales promelas, 24-hour) monitoring shall be performed in accordance with
Special Condition A (16) of this permit
If the facility is unable to obtain a sample due to dry or low flow conditions preventing the facility
from obtaining a representative sample, the Permittee shall submit its DMR, as required, and indicate
"No Flow" for the seep (15A NCAC 02B .0506(a)(1)(E)).
There shall be no discharge of floating solids or visible foam in other than trace amounts
Within 180 days of the issuance date of the pe -mit the permittee shall submit Items V and VI of NPDES
application Form 2C
Page 4 of 29

Permit NC0003425
A. (2) Effluent Limitations and Monitoring Requirements (Outfall 002 - normal operation -
decanting phase) [15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of the permit and lasting until expiration or
commencement of the dewatering operations, the Permittee is authorized to discharge from Internal
Outfall 002 (Ash Pond Treatment System to the Heated Water Discharge Canal - Normal
operations/Decanting of 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
CHARACTERISTICS
LIMITS
Monthly
Average
Daily
Maximum
MONITORING REQUIREMENTS
Measurement Sample Sample
Frequency Type Location
Flow
Daily
Continuous
Effluent
Total Selenium
Monthly
Grab
Effluent
Oil and Grease
15 0 m /L
20 0 m /L
2/Month
Grab
Effluent
Total Suspended Sohds3
30 0 m /L
100 m /L
2/Month
Grab
Effluent
Total Arsenic
Quarterly
Grab
Effluent
Total Molybdenum
Quarterly
Grab
Effluent
Total Chromium
Quarterly
Grab
Effluent
H4
Between 6.0 and 9 0 Standard Units
1 Monthly
Grab
Effluent
Notes:
1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system See Special Condition A. (31)
2 Samples taken in compliance with the monitoring requirements listed above shall be taken at the ash
pond discharge prior to mixing with other sources of wastewater.
3 The facility shall continuously monitor TSS concentration when the decanting process commences and
the dewatermg pump shall be shutoff automatically when the 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
4 The facility shall continuously monitor pH when the decanting process commences and the decanting
pump shall be shutoff automatically when 15 minutes running average pH falls below 61 standard
ums or rises above 8 9 standard units Pumping will be allowed to continue if interruption might
result in a dam failure or damage
The low volume wastes shall be discharged to the ash pond treatment system until new treatment system
is in operation
There shall be no discharge of pollutants in fly ash transport waters to the ash basm
By April 30, 2021 there shall be no discharge of pollutants in bottom ash transport waters This
requirement only applies to bottom ash transport water generated after April 30, 2021
When the facility commences the ash pond decanting/dewatering, the facility shall treat the wastewater
discharged from the ash pond by physical -chemical treatment.
The facility is allowed to drawdown the wastewater in the ash pond to no less than three feet above the
ash.
The level of water in the ash pond should not be lowered more than 1 ft/week, unless approved by the
DEQ Dam Safety Program.
Page 5 of 29

Permit NC0003425
The facility shall use a floating pump station with free water skimmed from the basin surface using an
adjustable weir.
The limits and conditions in Section A. (3) o" 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 Raleigh Regional Office
seven calendar days prior to the commencement of the decanting.
Page 6 of 29

Permit NC0003425
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 upon the commencement of the dewatermg operations and lasting until
expiration, the Permittee is authorized to discharge from Internal Outfall 002 (Ash Pond Treatment
System Dewatering - removing the interstitial water) Such discharges shall be limited and monitored'
by the Permittee as specified below
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly Daily Measurement Sample Sample
Average Maximum Fre uenc T e Location
Flow
2 0 MGD
Weekly
Continuous
Effluent
Total Selenium
Weekly
Grab
Effluent
Total Arsenic
Weekly
Grab
Effluent
Total Mercury
Weekly
Grab
Effluent
Total Molybdenum
Weekly
Grab
Effluent
Total Antimony
Weekly
Grab
Effluent
Total Copper
Weekly
Grab
Effluent
Oil and Grease
15 0 m /L
20 0 m /L
Weekly
Grab
Effluent
Total Suspended Sohds3
30 0 mg/L 1
100 mg/L
Weekly
Grab
Effluent
pH4
Between 6 0 and 9 0 Standard
Units
Monthly
Grab
Effluent
Notes:
1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system See Special Condition A. (31)
2 Effluent sampling shall be conducted at the discharge from the ash settling pond prior to mixing
with any other waste stream U
3. The facility shall continuously monitor TSS concentration when the decanting process commences and
the dewatermg pump shall be shutoff automatically when the 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 �.k t L)
4 The facility shall continuously monitor pH when the decantmg process commences and the decanting
pump shall be shutoff automatically when 15 minutes runrung average pH falls below 61 standard
unis or rises above 8 9 standard units Pumpmg will be allowed to continue if interruption might
result in a dam failure or damage.
There shall be no discharge of floating solids or visible foam in other than trace amounts
There shall be no discharge of pollutants in fly ash transport waters to the ash basin
By April 30, 2021 there shall be no discharge of pollutants in bottom ash transport waters This
requirement only applies to fly ash transport water generated after April 30, 2021
When the facility commences the ash pond decanting/dewatering, the facility shall treat the wastewater
discharged from the ash pond by physical -chemical treatment.
The level of water in the ash pond should not be lowered more than 1 ft/week, unless approved by the
DEQ Dam Safety Program.
The facility shall use a floating pump station with free water skimmed from the basin surface using an
adjustable weir.
Page 7 of 29

Permit NC0003425
A. (4) Effluent Limitations and Monitoring Requirements (Outfall 003) [15A NCAC 02B.0400
et seq., 02B .0500 et seq.]
During the period beginning on the effective date of the permit and lastmg until expiration, the Permittee
is authorized to discharge from Outfall 003 (Heated Water Discharge Canal System to the Hyco
Reservoir). Such discharges shall be limited and morutoredi by the Permittee as specified below -
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING
REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location
Flow
Daily
Calculation
Effluent
Total Residual
Chlorme3
28 µg/L
2/Month
Grab
Effluent
Total Phosphorus
Monthly
Grab
Effluent
Total Nitrogen
Monthly
Grab
Effluent
Temperature 4
Continuous
Recorder
Effluent,
Afterbay Discharge
Total Arsenic
Monthly
Grab
Effluent
Total Selenium
Monthly
Grab
Effluent
Chloride
Monthly
Grab
Effluent
Total Mercury
Monthly
Grab
Effluent
Total Antimony
Monthly
Grab
Effluent
Total Molybdenum
Monthly
Grab
Effluent
Total Thallium
0 24 µ /l
024 g /1
Monthly
Grab
Effluent
H5
Weekly
Grab
Effluent
Ammonia6
1.0 m /l
5 0 mg/1
Dail 6
Grab
Effluent
Acute Toxicity7
Quarterly
Composite
Effluent
Hardness -Total as
[CaCO3 or (Ca + Mg)],
m /l
Quarterly
Grab
Effluent, 4C 4D
rTurbidity8, NTU
Monthly
Grab
Effluent
Notes:
1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system See Special Condition A (31)
2 Effluent sampling shall be performed in the discharge canal at the point of discharge into Hyco
Reservoir
3 Total Residual Chlorine compliance is required only if chlorine or chlorine derivative is added to the
cooling water The Division shall consideY all effluent TRC values reported below 50 µg/L to be in
compliance with the permit However, the permittee shall continue to record and submit all values
reported by a North Carolina certified laboratory (including field certified), even if these values fall
below 50 µg/L
4 The Permittee shall operate so as to remain in compliance with the conditions outlined in the mixing
zone defined in Special Condition A (19),:)f this permit The temperature of Hyco Reservoir at no
time shall exceed the thermal water quality standard outside the mixing zone defined in Special
Condition A (18). These thermal limitations may be deleted or revised, as appropriate, based upon
evaluation of the results of the thermal studies This permit may be reopened to implement a
temperature limit if the pernuttee is not in compliance with Special Condition A (19)
5 The pH shall not be less than 6 0 standard units nor greater than 9 0 standard units
6 Ammoma limit and morutormg is only applicable in the event of an emergency release of anhydrous
ammonia during the time the released wa.ers are discharged through outfall 003
Page 8 of 29

Permit NC0003425
7 Acute Toxicity (Amephales promelas) P/F ® 90%, March, June, September and December See Special
Condition A (16) of this permit Composite samples for this effluent characteristic shall consist of 24
or more grab samples of equal volumes collected at equal intervals over a 24-hour period
8 The net turbidity shall not exceed 50 NTU using a grab sample and measured by the difference
between the effluent turbidity and the background turbidity. The sample for the background turbidity
shall be taken at point in the receiving waterbody upstream of the discharge location, and the
background turbidity and the effluent turbidity samples shall be taken within the same 24 hour
period
NTU - Nephelometric Turbidity Unit
The Pernuttee is allowed to operate Unit 3 in a once -through cooling mode from October 15 through April
30
There shall be no discharge of floating solids or visible foam in other than trace amounts outside a distance
five (5) meters from the discharge pipe
Page 9 of 29

Permit NC0003425
A. (5) Effluent Limitations and Monitoring Requirements (Internal Outfall 005) [15A
NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee
is authorized to discharge from Internal Outfall 005 (Cooling Tower Blowdown) Such discharges shall
be limited and monitored' by the Permittee as specified below
LIMITS
MONITORING REQUIREMENTS
EFFLUENT
MonthlyDaily
Measurement
Sample
CHARACTERISTICS
Average
Maximum
Frequency
Sample Type
Location2
Flow
Continuous
Pump Logs
Effluent
during discharge
Free Available Chlorme3 200 µ /L
500 µ /L
2/month
Multiple Grabs
Effluent
Total Residual Chlorme3
Monthly
Multiple Grabs
Effluent
Total Chromium4 200 µ /L
200 Et /L
2/Month
Composite
Effluent
Total Zinc4 1.0 m /L
1.0 m `/L
2/Month
Composite
Effluent
The 126 Priority Pollutants (40
CFR Part 423, Appendix A) No Detec able Amount
Annual
Grab
Effluent
Exclusive of Zinc and
Chromium4
Notes:
1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system. See Special Condition A. (31)
2 Effluent sampling shall be conducted at the discharge from the cooling tower prior to mixing with
other waste streams
3 Neither free available chlorine nor total residual chorme may be discharged from any single
generating unit for more than two hours per day, unless the Permittee demonstrates to the Division
that discharge for more than two hours is required for macroinvertebrate control The 500 µg/L is a
daily maximum hmitation and is to b'e measured during the chlorine release period The 200 µg/L
limitation is an average during -the chlorine release period Monitoring is required only when chlorine
r
is added to the cooling water system
4 These hmitatrons and monitoring requirements apply if these substances are added by the Permittee
for cooling tower maintenance. There shall be no detectable amounts of the 126 priority pollutants (40
CFR 423 Appendix A) contained in chemicals added for cooling tower except for total chromium and
total zinc Compliance with the limitations for the 126 priority pollutants in 40 CFR Section
423.13(d)(1) may be determined by enginee'rmg calculations which demonstrate that the regulated
pollutants are not detectable in the final discharge by the analytical methods in 40 CFR Part 136
Discharge of blowdown from the coohng tower is defined as the minimum discharge of recirculation
water necessary for the purpose of dischargmg materials contained in the process, the further build-up of
which would cause concentration in amounts exceeding limitations established by best engineering
practice.
The Permittee is authorized to discharge Maintenance Dram wastewater from the Cooling Tower for Unit
4 directly to the discharge canal Grab samples of the following parameters are to be collected prior to
mixing with other waste streams and the results shall be submitted to DWR: pH (SU), flow (MGD) and
total residual chlorine ('prig/L) The Permittee shall notify the Division of Water Resources, Raleigh
Regional Office, prior to draining the cooling tower, except during non -office hour emergencies when
notification must be made the next working day Total residual chlorine monitoring is required prior to a
maintenance dram of the Unit 4 Cooling Tower only if chlorine is added to the system
Page 10 of 29

Permit NC0003425
A. (6) Effluent Limitations and Monitoring Requirements (Outfall 006) [15A NCAC 02B
.0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee
is authorized to discharge from Outfall 006 (Coal Pile Runoff Treatment System to the Hyco Reservoir).
Such discharges shall be 'muted and monitored' by the Permittee as specified below.
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly Daily Measurement 2
Average FMaximum Fre uenc Sample Type Sample Location
Flow
2/Month
Estimate
Effluent
Total Suspended Solids
30 m /L
50 m /L
2/Month
Grab
Effluent
Total Selenium
5.0 gg/l
56.0 gg/1
Monthly
Grab
Effluent
Oil and Grease
15.0 m /L
20 0 m /L
2/Month
Grab
Effluent
H3
2/Month
Grab
Effluent
Acute Toxicity4
Annually
Grab
Effluent
Notes:
1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system See Special Condition A (31)
2 Effluent sampling shall be conducted at the point of discharge into Hyco Reservoir. Samples taken in
compliance with the monitoring requirements listed above shall be taken prior to mixing with other
sources of wastewater
3 The pH shall not be less than 6.0 standard units nor greater than 9 0 standard units
4 Acute Toxicity (Pimephales promelas, 24-hour) monitoring shall be performed in accordance with
Special Condition A (17) of this permit
There shall be no discharge of floating solids or visible foam in other than trace amounts outside a distance
five (5) meters from the discharge pipe.
Material storage runoff shall include rainfall to navigable waters through any discernable, confined
and/or discrete conveyance from, or through, coal
Within 180 days of the effective date of the permit, the permittee shall submit Items V and VI of NPDES
application Form 2C
Page 11 of 29

Permit NC0003425
A. (7) Effluent Limitations and Monitoring Requirements (Internal Outfall 008) [15A
NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of the permit and lasting until expansion to 0 025 MGD
or expiration, the Permittee is authorized to discharge from Internal Outfa11008 (Domestic Wastewater
Treatment System) into the ash pond or the low volume waste treatment system. Such discharges shall be
limited and morutoredl by the Permittee as specified below
EFFLUENT
CHARACTERISTICS
DAILY MAXIMUM
MONITORING
REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample Type
Sample
Location
Flow
0 015 MGD
Annual
Pump Los
Effluent
Biochemical Oxygen
Demand 5 -da Q 20'C
30 0 mg/L
45.0 mg/L
Annual
Grab
Effluent
Total Suspended Solids
30 0 m /L
45 0 m /L
Annual
Grab
Effluent
Total Ammonia as N
Annual
Grab
Effluent
H3
Annual
Grab
Effluent
Fecal Coliform
200/100 ml
400/100 ml
Annual
Grab
Effluent
Notes:
1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system See Special Condition A. (31)
2 Samples taken in compliance with the morutormg requirements listed above shall be taken after
treatment and prior to mixing with other sources of wastewater
3 The pH shall not be less than 6 0 standard units, nor greater than 9.0 standard units
See Special Condition A (24).
Page 12 of 29

Permit NC0003425
A. (8) Effluent Limitations and Monitoring Requirements (Internal Outfall 008) [15A
NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning upon expansion to 0 025 MGD and lastmg until expiration, the Permittee is
authorized to discharge from Internal Outfall 008 (Domestic Wastewater Treatment System) into the ash
pond or the low volume waste treatment system. Such discharges shall be limited and monitored' by the
Permittee as specified below
EFFLUENT
CHARACTERISTICS
DAILY MAXIMUM
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample Type
Sample
Location
Flow
0 025 MGD
Quarterly/ AnnuaP
Pump Los
Effluent
Biochemical Oxygen
Demand 5 -da Q 20°C
30 0 mg/L
45 0 mg/L
Quarterly/AnnuaP
Grab
Effluent
Total Suspended Solids
30 0 m /L
45 0 m /L
Quarterly/ AnnuaP
Grab
Effluent
Total Ammonia as N
Quarterly/ AnnuaJ3
Grab
Effluent
pH
6 to 9 S.0
Quarterly/Annual3
Grab
Effluent
Fecal Coliform
200/100 ml
400/100 ml
Quarterly/AnnuaP
Grab
Effluent
Notes:
1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system See Special Condition A. (31)
2 Samples taken in compliance with the monitoring requirements listed above shall be taken after
treatment and prior to mixing with other sources of wastewater
3 After one year of quarterly monitoring the sampling frequency will be modified to Annual
See Special Condition A (24)
Page 13 of 29

Permit NC0003425
A. (9) Effluent Limitations and Monitoring Requirements (Internal Outfall 009) [15A NCAC
02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee
is authorized to discharge from Internal Outfall 009 (Metal Cleaning Wastes) Such discharges shall be
limited and monitored' by the Permittee as specified below
Notes:
1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system See Special Condition A (31)
2 Samples taken in compliance with the monitoring requirements listed above shall be taken prior to
mixing with other sources of wastewater
For the purposes of this permit, the term "Once per Discharge Event" shall mean the discharge from
Outfall 002 that occurs within 30 minutes from the time the fly ash containing metal cleaning waste is
discharged into the ash pond plus the calculated detention time of the ash pond
Page 14 of 29
LIMITS
MONITORING REQUIREMENTS
EFFLUENT
CHARACTERISTICS
Monthly
Daily
TMaximum
Measurement
Sample Type
Sample
s
Average
Frequency
Location
Flow
Once per Discharge
Pump Logs or
Outfall 002
Event
similar reading
Total Suspended Solids
30 0 mg/L
100 mg/L
Once per Discharge
Grab
Outfall 002
Event
Oil and Grease
15 0 mg/ L
20 3 mg/ L
Once per Discharge
Grab
Outfall 002
Event
Total Copper
10 mg/L
10 mg/L
Once per Discharge
Grab
Outfall 002
Event
Total Iron
10 mg/L
10 mg/L
Once per Discharge
Grab
Outfall 002
Event
pH
6 to 9 S.U.
Once per Discharge
Grab
Outfall 002
Event
Notes:
1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system See Special Condition A (31)
2 Samples taken in compliance with the monitoring requirements listed above shall be taken prior to
mixing with other sources of wastewater
For the purposes of this permit, the term "Once per Discharge Event" shall mean the discharge from
Outfall 002 that occurs within 30 minutes from the time the fly ash containing metal cleaning waste is
discharged into the ash pond plus the calculated detention time of the ash pond
Page 14 of 29

Permit NC0003425
A. (10) Effluent Limitations and Monitoring Requirements (Internal Outfall 010) [15A
NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of the permit and lastmg until the existing treatment
system is decommissioned, the Permittee is authorized to discharge from Internal Outfa11010 (FGD
blowdown) Such discharges shall be limited and monitored' by the Permittee as specified below
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Sample Type Sample Locationz
Frequency
Flow
Monthly
Pump Logs or
similar reading
Effluent
Total Suspended Solids
30 mg/1
100 mg/1
Quarterly
Grab
Effluent
Oil and grease
15 mg/1
20 mg/1
Quarterly
Grab
Effluent
Total Arsenic 3
8 / 1
11 / 1
Quarterly
Grab
Effluent
Total Mercury 3
356 n /l
788 ng/1
Quarterly
Grab
Effluent
Total Selenium 3
12 /1
23 /l
Quarterly
Grab
Effluent
Nitrate/Nitrite as N 3
4 4 mg/1
17 mg/1
Quarterly
Grab
Effluent
H4
I
Quarterly
Grab
Effluent
Notes:
1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system. Special Condition A. (31)
2 Samples taken in compliance with the monitoring requirements listed above shall be taken after
bioreactor treatment and prior to mixing with other sources of wastewater.
3 The limits shall become effective December 31, 2023.
4 The pH shall not be less than 6.0 standard units, nor greater than 9 0 standard units
There shall be no discharge of untreated FGD blowdown
Page 15 of 29

Permit NC0003425
A. (11) Effluent Limitations and Monitoring Requirements (Internal Outfall. 011) [15A
NCAC 02B .0400 et seq., 02B .0500 et seq.I
During the period beginning upon the commencement of operations of the new FGD system and lasting
until expiration, the Permittee is authorized to discharge from Internal Outfall 011 (FGD blowdown)
Such discharges shall be limited and monitored' by the Permittee as specified below -
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly Daily Measurement
Sample Type Sample Locationz
Average Maximum Fre uen
Flow
Monthly
Pump Logs or
similar reading
Effluent
Total Suspended Solids
30 m /l
100 m /l
Quarterly
Grab
Effluent
Oil and grease
15 mg/1
20 mg/1
Quarterly
Grab
Effluent
Total Arsenic 3
8 /1
11 /1
Quarterly
Garb
Effluent
Total Mercury 3
356 ng/1
788 ng/1
Quarterly
Grab
Effluent
Total Selenium 3
12 /l
23 /1
Quarterly
Grab
Effluent
Nitrate/Nitrite as N 3
4 4 m /l
17 mg/1
Quarterly
Grab
Effluent
H
6 to 9 S U
Quarterly
Grab
Effluent
Notes:
1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system See Special Condition A (31).
2 Samples taken in compliance with the monitoring requirements listed above shall be taken after
bioreactor treatment and prior to mixing with other sources of wastewater
3 The limits shall become effective December 31, 2023
There shall be no discharge of untreated FGD blowdown.
Page 16 of 29

Permit NC0003425
A. (12) Effluent Limitations and Monitoring Requirements (Internal Outfall 012A) [15A
NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning upon the start of operation of the retention basm and lastmg until expiration,
the Permittee is authorized to discharge from Internal Outfall 012A. Such discharges shall be limited and
monitored' by the Permittee as specified below -
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Month'
Average
Dail Measurement
Maximum Fre uenc
Sample Type Sample Location2
Flow
Monthly
Pump Logs or
Effluent
smular reading
Total Suspended Solids
30 mg/1
100 mg/1 Quarterly
Grab Effluent
Oil and grease
15 mg/1
20 mg/1 Quarterly
Grab Effluent
H
6 to 9 S U Quarterly
Grab Effluent
Notes
1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system See Special Condition A. (31)
2 Samples taken in compliance with the monitoring requirements listed above shall be taken after
the treatment system and prior to mixing with other sources of wastewater.
Within 180 days of the commencement of operations of the treatment system the permittee shall submit
Items V and VI of NPDES application Form 2C
Page 17 of 29

Permit NC0003425
A. (13) Effluent Limitations and Monitoring Requirements (Internal Outfall 012B) [15A
NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning upon the start of operation of the retention basm and lastmg until expiration,
the Pernuttee is authorized to discharge from Internal Outfall 012B Such discharges shall be limited and
monitored' by the Permittee as specified below
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Fre uenc
Sample Type
Sample Location
Flow
Monthly
Pump Logs or
similar reading
Effluent
Total Suspended Solids
30 mg/1
100 mg/1
Quarterly
Grab
Effluent
Oil and grease
15 mg/1
20 mg/1
Quarterly
Grab
Effluent
H
6 to 9 S.U.
Quarterly
Grab
Effluent
Ammorua3
Per discharge
event
Grab
Effluent
BOD
Quarterly
Grab
Effluent
Fecal Coliform
Quarterly
Grab
Effluent
Notes
1 The permittee shall submit Discharge Monitoring Reports electronically using NC DWR's eDMR
application system See Special Condition A. (31)
2 Samples taken in compliance with the: monitoring requirements listed above shall be taken after
the treatment system and prior to mixing with other sources of wastewater
3 Ammonia monitoring shall be daily during a discharge of emergency anhydrous ammonia
Within 180 days of the commencement of operations of the treatment system the permittee shall submit
Items V and VI of NPDES application Form 2C
Page 18 of 29

Permit NC0003425
A. (14) Effluent Limitations and Monitoring Requirements (Internal Outfall 012C) [15A
NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning upon the start of operation of the retention basm and lastmg until expiration,
the Permittee is authorized to discharge from Internal Outfall 012C Such discharges shall be limited and
monitored' by the Permittee as specified below
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING
REQUIREMENTS
Monthly
Average
Daily
FMaximum
Measurement
Frequency
Sample Type
Sample
Location
Flow
Monthly
Pump Logs or
similar readm
Effluent
Total Suspended Solids
30 mg/1
100 mg/1
Per discharge event
Grab
Effluent
Oil and grease
15 mg/1
20 mg/1
Per discharge event
Grab
Effluent
H
6 to 9 S U
Per discharge event
Grab
Effluent
Ammonia3
10 mg/1
5 0 mg/1
Per discharge event
Grab
Effluent
BOD
Per discharge event
Grab
Effluent
Fecal Coliform
Per discharge event
Grab
Effluent
Total Arsenic, pg/1
Per discharge event
Grab
Effluent
Total Mercury, ng/1
Per discharge event
Grab
Effluent
Total Selenium, lig/1
Per discharge event
Grab
Effluent
Nitrate/Nitrite as N,
mg/1
Per discharge event
Grab
Effluent
Total Copper, pg/1
Per discharge event
Grab
Effluent
Total Iron, pg/1
Per discharge event
Grab
Effluent
Notes
1 The permittee shall submit Discharge Monitoring Reports electrorucally using NC DWR's eDMR
application system See Special Condition A. (31).
2 Samples taken in compliance with the monitoring requirements listed above shall be taken after
the treatment system and prior to mixing with other sources of wastewater
3 Ammonia limits and monitoring shall apply if a discharge of emergency anhydrous ammonia is
occurring at the same time as the emergency overflow
Within 180 days of the first discharge event the permittee shall submit Items V and VI of NPDES
application Form 2C
Page 19 of 29

Permit NC0003425
A. (15) Discharge from Seepage
Existing discharges from seepage
The facility identified four unpernutted seeps from the ash landfill area dischargmg from a common
outfall The locations for the seeps covered by the permit are identified below and are depicted on the map
attached to the permit
Seeps
ID
Latitude
Longitude
Outfall
-Seep
S9
3647823
-79056076
001
S10
36 479169
-79056936
001
S11
36 478569
-79056737
001
S12
36 478103
-79056735
001
The outfall for these discharges is through an effluent channel meeting the requirements in 15A NCAC 2B
0228. Within 180 days of the effective date of this permit, the permittee shall demonstrate, through in -
stream sampling meeting the requirements of condition A. (20 ), that the water quality standards in the
receiving stream are not contravened
Discharges from Seepage Identified After Permit Issuance
The facility shall comply with the "Plan for Identification of New Discharges' as contained in Attachment
2 For any discharge identified pursuant to this Plan, the facility shall, within 90 days of the seep
discovery, determine if the discharge seep meets the state water quality standards established in 15A
NCAC 2B 0200 and submit the results of this determination to the Division If the standards are not
contravened, the facility shall conduct monitoring for the parameters specified in A (1 )
If any of the water quality standards are exceeded, the facility shall be considered in violation until one of
the options below is fully implemented
1) Submit a complete application for 404 Permit (within 30 days after determining that a water
quality standard is exceeded) to pump the seep discharge to one of the existing outfalls, install a
pipe to discharge the seep to the Catawba River, or install an in-situ treatment system After the
404 Permit is obtained, the facility shall complete the installation of the pump, pipe, or treatment
system within 180 days from the date of the 404 permit receipt and begin pumpmg/ discharging or
treatment.
2) Demonstrate through modeling that the decanting and dewatermg of the ash basm will result in
the elimination of the seep. The modeling results shall be submitted to the Division within 120
days from the date of the seep discovery Within 180 days from the completion of the dewatering
the facility shall confirm that the seep flow ceased If the seep flow continues, the facility shall
choose one of the other options in this Special Condition
3) Demonstrate that the seep is discharging through the designated "Effluent Channel' and the
water quality standards in the receiving stream are not contravened This demonstration should
be submitted to the Division no later than 180 days from the date of the seep discovery The
"Effluent Channel" designation should be established by the DEQ Regional Office personnel prior
to the issuance of the permit This permit shall be reopened for cause to include the "Effluent
Channel' in a revised permit
All effluent limits, including water quality -based effluent limits, remain applicable notwithstanding any
action by the Permittee to address the violation through one of the identified options, so that any
discharge in exceedance of an applicable effluent limit is a violation of the Permit as long as the seep
remains flowing
The new identified seep is not permitted until the permit is modified and the new seep included in the
permit and the new outfall established for the seep
Page 20 of 29

Permit NC0003425
A. (16) Acute Toxicity Testing PASS/FAIL Permit Limit Outfalls 001 and 003 [15A NCAC 02B
.0200 et seq ]
The Permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined in the North
Carolina Procedure Document entitled "Pass/Fail Methodology For Determining Acute Toxicity In A
Single Effluent Concentration" (Revised -December 2010 or subsequent versions). The monitoring shall be
performed as a Fathead Minnow (Pimephales promelas) 24 hour static test. The effluent concentration at
which there may be at no time significant acute mortality is 90% (defined as treatment two in the
procedure document) The tests will be performed during the months of 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
The Permittee shall conduct acute toxicity tests on auaq rterl basis using protocols defined in the North
Carolina Procedure Document entitled "Pass/Fail Methodology For Determining Acute Toxicity In A
Single Effluent Concentration" (Revised -December 2010 or subsequent versions) The monitoring shall be
performed as a Fathead Minnow (Amephales promelas) 24 hour static test The effluent concentration at
which there may be at no time significant acute mortality is 90% (defined as treatment two in the
procedure document). The tests will be performed during the months of March, June, September and
December. 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.
The parameter code for Pimephales promelas is TGE6C. All toxicity testing results required as part of this
permit condition will be entered on the Effluent Discharge Form (MR -1) for the month in which it was
performed, using the appropriate parameter code Additionally, DWR Form AT -2 (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 and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data 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 any month, 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 Permittee fail to monitor during a month in which toxicity monitoring is required, then
monthly monitoring will begin immediately Upon submission of a valid test, this monthly test
requirement will revert to quarterly in the months specified above
Should any test data from either these monitoring requirements 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 21 of 29

Permit NC0003425
NOTE Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival 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. (17) Acute Toxicity Monitoring (ANNUAL) Outfall 006 [15A NCAC 02B.0200 et seq.]
The permittee shall conduct annual acute toxicity tests using protocols defined as definitive in EPA
Document EPA -821-R-02-012 entitled "Methods for Measuring the Acute Toxicity of Effluents and
Receiving Waters to Freshwater and Marine Organisms " The monitoring shall be performed as a Fathead
Minnow (Pimephales promelas) 48 hour static test. Effluent samples for self-momtormg purposes must be
obtained during representative effluent discharge and shall be performed at the NPDES permitted final
effluent discharge below all waste treatment processes
The parameter code for Pimephales promelas is TAA6C All toxicity testing results required as part of this
permit condition will be entered on the Effluent Discharge Form (MR -4) for the month in which it was
performed, using the appropriate parameter code. Additionally, DWR Form AT -1 (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
l
Test data shall be complete and accurate and include all supporting chemical/ physical measurements
performed in association with the toxicity tests, as well as all dose/response data 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 any month, 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 any test data from either these monitoring requirements 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.
NOTE Failure to achieve test conditions as specified in the cited document, such as mnumum control
organism survival 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. (18) Intake Screen Backwash Condition
Continued intake screen backwash discharge is permitted without linutations or monitoring requirements
Page 22 of 29

Permit NC0003425
A. (19) Temperature Requirements (Outfall 003 Mixing Zone)
a Water quality standards for temperature for lower piedmont waters (32° C) will not apply within a
mixing zone, which shall include the North Hyco arm downstream of NC Highway 57, the main
body of Hyco Reservoir downstream of the confluence of the Cobbs Creek Arm and the North Hyco
Arm, and the entire afterbay lake The area described does not include the South Hyco Arm or the
first finger arms on the west side of the reservoir lying upstream of the dam Water within the main
lake and the afterbay lake to Hyco River shall comply with water quality standards except the
temperature standards in the areas of the lake defined herem as a mixmg zone Water discharged
from the afterbay shall comply with the temperature standard
b Temperature measurements made to monitor compliance with this provision shall be made at least
six inches, but not more than one foot, below the surface of the lake A monthly average
temperature shall consist of at least five determinations conducted on five separate days
c Temperature increases shall be determined as the increase in temperature above the temperature
measured at the confluence of the two southern finger arms on the north side of the lake (Lat.
36 5111, Long 79 06629)
d A summary of the temperature monitoring results at all sampling locations as established in the
biological morutormg program for Hyco Reservoir and condition A (4) shall be submitted to the
Division with the annual Biological Monitoring Report due by July 31 of the following year
A. (20) Biological and Instream Monitoring
In accordance with the previously submitted biological monitoring program (as approved by the Director
of the Division, and as it may be amended), the Permittee shall submit results of biological studies and
monitoring programs by July 31 of the following year The following parameters shall be included in the
surface water sampling protocol. total arsenic, total selenium, total mercury (method 1631E), total
chromium, dissolved lead, dissolved cadmium, dissolved copper, total hardness, and dissolved zinc For
fish tissue sampling the following parameters shall be included: arsenic, selenium and mercury
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 Science Section
1621 Mail Service Center
Raleigh, NC 27699-1621
A. (21) Applicable State Law
This facility shall meet the requirements of Senate Bill 729 (Coal Ash Management Act). This permit may
be reopened to include new requirements unposed by Bill 729
A. (22) PCB Prohibition
There shall be no discharge of polychlormated biphenyl compounds such as those commonly used for
transformer fluid
Page 23 of 29

Permit NC0003425
A. (23) Limitations Reopener
The permit shall be modified, or revoked and reissued, to comply with any applicable effluent guideline
or water quality standard issued or approved under sections 302(b)(2)(c) and (d), 304(b)(2) and 307(a) of
the Clean Water Act, if the effluent guideline :)r water quality standard so issued or approved
a. Contains different conditions or is otherwise more stringent than any effluent limitation in the
permit; or
b Controls a pollutant not limited in the permit
The permit as modified or reissued under this paragraph shall also contain any other requirements in the
Act then applicable.
A. (24) Domestic Wastewater Treatment Plant
The permittee shall at all times properly operate and maintain the domestic wastewater treatment plant to
meet secondary standards as specified for internal,outfall'008
A. (25) Bioreactor Condition
An operation and maintenance plan, including a monitoring /regimen for the bioreactor units and an
emergency response plan in the event, of an upset, shall be maintained and available for inspection by
Division personnel.
A. (26) Ash Pond Closure
The facility shall prepare an Ash Ponds Closure Plan This Plan shall be submitted to the Division one month
prior to the closure of ash ponds
A. (27) Groundwater Monitoring Well Construction And Sampling
The permittee shall conduct groundwater monitoring to determine the compliance of this NPDES permitted
facility with the current groundwater/Standards found under 15A NCAC 2L 0200 The monitoring shall be
conducted in accordance with the Sampling Pian approved by the Division See Attachment 1.
A. (28) Clean Water Act Section 316(b)
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
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
Page 24 of 29

Permit NC0003425
A. (29) Structural Integrity Inspections of Ash Pond Dam
The facility shall meet the dam design and dam safety requirements per 15A NCAC 2K as amended by
statute
A. (30) Biocide Condition
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
mstitutmg 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 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. (31) Electronic Reporting of Discharge Monitoring Reports [G.S. 143-215.1(b)]
Federal regulations require electronic submittal of all discharge morutormg 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. Reporting Requirements [Supersedes Section D. (2.) and Section E. (5.) (a))
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 printmg,
signmg, 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 25 of 29

Permit NC0003425
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 /--0 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 3e available as well Information on EPA's NPDES
Electronic Reporting Rule is found at htto / /www2 epa gov/compliance/fmal-national-pollutant-
dischar ge-ehmmation-system-nudes-electronic-reporting-rule
Electronic submissions must start by the Bates 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 subnutted 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 Ete 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
Page 26 of 29

Permit NC0003425
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
hqp //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.)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. (32) Additional Conditions and Definitions
The following special conditions are applicable to all outfalls regulated by this permit
a) 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 or regulations
b) Discharge of any waste resulting from the combustion of toxic or hazardous waste to any waste
stream which ultimately discharges to waters of the United States is prohibited, unless specifically
authorized in this permit.
c) The permittee shall report all visible discharges of floating materials (such as an oil slick) to the
Director when submitting DMRs.
d) "Upset," means an exceptional incident in which there is an unintentional and temporary non-
compliance with technology-based effluent limitations because of factors beyond the reasonable
control of the permittee An upset does not include noncompliance to the extent cause by
operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of
preventative maintenance, or improper operations.
e) All flows shall be reported on monthly DMRs Should no flow occur during a given month, the
words "no flow" should be clearly written on the front of the DMR.
f) EPA methods 200.7 or 200.8 (or the most current versions) shall be used for analyses of all metals
except for total mercury
g) 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 122 410))
h) 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 42311 (b)).
Page 27 of 29

Permit NC0003425
i) 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 42311 (c))
j) 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 42311 (d))
k) 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
Page 28 of 29

Pu rim NC'000342.5
Duke Energy progress-- Roxbor,o5team Station" Porson County
Facll,tty Location
ReCewing Strea[n, 14yC4 Reservoir Stream Class W5 V, It
Sub -Basin, 03, 0z 0,5 State Grid B22VEjohve Hill
Drainage Basin Roanoke River Basin
Outfall 001 Latitude W 29" 10" Longitude 79' 03',34'
Outfall 003 Lntitode35',2$ 4&'"L.ongirude.79105111"
Outfall 006 Latitude 364 19' 13" Longitude 79' 04' 41"
outfall 012 Larihde a6P iW 14" Longitude 79 04' 55' NPDES Permit NC0003425
Page. �9 oF29

Hyco Reservoir Sampling Locations
Roxboro Slearn
Electric Plant
NORTH CAROLINA
.l
r
Hwy 67
Discharge
(Outfall db(a
Afterbay
Reservoir
Cane Creek
Main
Dam
Plant Site
4 Intake Canal
Hwy 119,'
, \ Dry Ash Landfill
err F J7 �1 ` Disohar e!A/Ash Settling Pond
G (Outfall 003
�( N
Person-Gaswel(
1 f r Lake Authority ti
,
� Cobbs Creek
i
,
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North Hyco Creek
0 1 2 3
South Hyco Creek I I I I
((f Kilometers
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Miles

Attachment 1
GROUNDWATER MONITORING PLAN
The permittee shall conduct groundwater monitoring as may be required to determine the compliance of
this NPDES permitted facility with the current groundwater Standards found under 15A NCAC 2L.0200.
1. WELL CONSTRUCTION
a. Monitoring wells shall be constructed in accordance with 15A NCAC 02C .0 10 8
(Standards of Construction for Wells Other than Water Supply) and any other
jurisdictional laws and regulations pertaining to well construction.
b. Monitoring wells must be constructed by a North Carolina Certified Well
Contractor, the property owner, or the property lessee according to General
Statutes 87-98.4. If the construction is not performed by a certified well contractor,
the property owner or lessee, provided they are a natural person, must physically
perform the actual well construction activities.
C. Within 30 days of completion of well construction, a completed Well Construction
Record (Form GW -1) must be submitted for each compliance monitoring well to
Division of Water Resources, Water Quality Regional Operations Section
(WQROS), 1636 Mail Service Center, Raleigh, NC 27699-1636.
d. The Raleigh Regional Office, telephone number [phone], shall approve the
location of new compliance monitoring wells prior to installation The regional
office shall be notified at least 48 hours prior to the construction of any compliance
monitoring well and such notification to the WQROS regional supervisor shall be
made from 8:00 a.m until 5:00 p.m. on Monday through Friday, excluding State
Holidays.
e. All monitoring wells shall be regularly maintained. Such maintenance shall
include ensuring that the well caps are rust -free and locked at all tunes, the outer
casing is upright and undamaged, and the well does not serve as a conduit for
contamination.
f. If the Permittee intends to abandon a compliance monitoring well either
temporarily or permanently, the Permittee shall justify the abandonment and
request approval from the WQROS Regional Office within 30 business days prior
to initiating abandonment procedures.
g. Monitoring wells shall be abandoned in accordance with 15A NCAC 02C .0113
(Abandonment of Wells). Within 30 days of completion of well abandonment, a
completed Well Abandonment Record (Form GW -30) must be submitted for each
monitoring well to WQROS, 1636 Mail Service Center, Raleigh, NC 27699-1636.
2. MAPS
a. Updated maps shall be provided within 60 days when any of the following occur:
1. Compliance monitoring wells are added or deleted from the plan.
ii. The facility operation changes that would require a change in the waste
boundary, compliance boundary, or property line.
b. If the map is updated, the Permittee shall submit two original copies of a site map
with an appropriate scale to easily identify all features overlaid on the most recent
aerial photograph. At a minimum, the map shall include the following
information:
i. The location and identity of each monitoring well.
ii. The location of major components of the waste disposal system
ill. The location of property boundaries within 500 feet of the disposal areas.
iv. The elevation of the top of the well casing (i.e., measuring point) relative
to a common datum
NC0003425 — Roxboro
Groundwater Monitoring Plan Pagel of 3

Vi. The depth of water below the measuring point at the tune the measuring
point is established
vii. The location of compliance boundary.
vitt. The date the map is prepared and/or revised.
ix. Topographic contours in no more than ten (10) foot intervals For areas of
high relief, 20 foot intervals shall be acceptable.
c The map and any supporting documentation shall be sent to the WQROS, 1636
Mail Service Center, Raleigh, NC 27699-1636.
3. GROUNDWATER SAN_PLING AND COMPLIANCE.
a. 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) or (d) as well
as enforcement actions in accordance with North Carolina General Statute 143-
215.6A through i43 -215.6C.
b. Monitoring wells shall be sampled after construction and thereafter at the
frequencies and =or the parameters as specified in Part 4 of this plan. All maps,
well construction forms, well abandonment forms and monitoring data shall refer
to the permit number and the well nomenclature.
C. Per 15A NCAC 02H .0800, a Division certified laboratory shall conduct all
laboratory analyses for the required effluent, groundwater or surface water
parameters.
d. The measurement of water levels shall be made prior to purging the wells. The
depth to water in each well shall be measured from the surveyed point on the top
of the casing.
e The measuring points (top of well casing) of all monitoring wells shall be surveyed
to provide the relative elevation of the measuring point for each monitoring well.
The measuring points (top of casing) of all monitoring wells shall be surveyed
relative to a common datum.
f. Two copies of the monitoring well sampling shall be submitted on a Compliance
Monitoring Form (GW-59CCR), and received no later than 45 days from the
sampling date. Copies of the laboratory analyses shall be kept on site, and made
available upon request. The Compliance Monitoring Form (GW-59CCR) shall
include this permit number and the appropriate well identification number. The
Compliance Monitoring Forms (GW-59CCR) shall be submitted to the Division
of Water Resources Information Processing Unit, 1617 Mail Service Center,
Raleigh, North Carolina 27699-1617
g. For groundwater samples that exceed the ground water quality standards in 15A
NCAC 02L .0202, the Regional Office shall be contacted within 30 days after
submission of the groundwater monitoring form; an evaluation may be required to
determine the impact of the waste disposal activities Failure to do so may subject
the permittee to a Notice of Violation, fines, and/or penalties.
h. The provisions of sections 3(f) and 3(g) apply only to the sampling events
described in 3(b) above. The reporting requirements for any sampling events other
than those descr_bed in 3(b) above shall be in accordance with the general
provisions of 15A NCAC 02L
4. MONITORING WELLS, PARAMETERS, AND SAMPLING FREQUENCY.
a. Laboratory methods shall be EPA approved and sufficient to detect constituent
quantities at or below their individual 15A NCAC 02L groundwater standards.
NC0003425 — Roxboro
Groundwater Monitoring Plan Page 2 of 3

b. The following chart contains the compliance monitoring wells to be sampled, the
parameters to be sampled, and the frequency in which the samples shall be
collected.
MONITORING
WELLS
PARAMETERS
FREQUENCY
Laboratory Parameters
Aluminum Antimony Arsenic Banum
Beryllium Boron Cadmium Calcium
Cobalt Chromium Copper Iron
Lead Magnesium Manganese Molybdenum
Mercury Nickel Potassium Selenium
Sodium Strontium Thallium Vanadium
CW -1, CW -2, CW -2D,
CW -3, CW -3D, CW -4,
CW -5, BG -1
April, July,
November
Zinc Chloride Sulfate Alkalinity
Bicarbonate Dissolved Total
Bicarbonate Carbonate Solids Suspended
Solids
Field Parameters
Turbidity
pH
Temperature
Specific
Conductance
Dissolved
Oxygen
Oxidation
Reduction
Potential
Water level
NC0003425 — Roxboro
Groundwater Monitoring Plan Page 3 of 3

Attachment 2
Plan for Identification of New Discharges (State Enforceable Only)
https //ncdenr s3 amazonaws com/s3fs-
pubhc/Water%20Quahty/NPDES%2OCoal%2OAsh/Chffside%20PIan%20for%20Identification%20of /020
New%20Dis ch arges %2OS ep t%203 0 %20201412 d f