NCS000580_Renewal Application_20201230

(� DUKE
ENERGY,.
File: Mayo12520-R
Ms. Suzanne McCoy
NC DEMLR Stormwater Program
1612 Mail Service Center
Raleigh, NC 27699-1612
Subject: Duke Energy Progress, LLC.
Mayo Electric Generating Plant
NPDES Industrial Stormwater Permit NCS000580
Renewal and Modification Request
Dear Ms. McCoy:
December 17, 2020
Mayo Electric Generating Plant
Duke Energy Progress
10660 Boston Road
Roxboro, NC 27574
DEC 3 0 2020
DENR-LAND QUALITY
STORMWATER PERMITTING
Duke Energy Progress, LLC is submitting herewith supplemental information in support of renewing and
modifying NPDES permit No. NCS000580 as well as a major modification. The subject NPDES permit
expires December 31, 2021. The requested modification will provide coverage for the three monofill
stormwater outfalls 001, 002, and 003. All three of these stormwater outfalls discharge to Bowes Branch,
a class C surface water in the Roanoke River Basin and are currently covered under the NCG 120101
permit. The NCG120101 will expire May 31, 2021. Duke Energy requests the renewal and reissuance of
NPDES Permit No. NCS000580 and further requests that the NCG120101 permit be rescinded upon
reissuance of the subject NPDES permit.
Attached is the renewal application and duplicate copies of all supplementary information.
Should you have any questions please contact Ms. Lori Tollie at Lori.TollieAduke-enero.com or at
(336)-854-4916.
Sincerely,
Tom Co o
General Manger — Mayo Steam Station
Attachments:
Renewal Application
Supplemental Information
Site map from the Stormwater Pollution Prevention Plan
Summary of Analytical Monitoring Results
Summary of Visual Monitoring Results
Significant Site Changes
Certification of Development and Implementation of SPPP
Fish Tissue Monitoring Results
General Permit Renewal Guidance Letter with NCG120101 Results

May Steam Electric Station
Stormwater Permit NCS000580
Individual Permit Application
Supplemental Information

Permit Coverage
Renewal Application Form
NCDENR National Pollutant Discharge Elimination System NPDES Permit Number
Stormwater Individual Permit NCS000580
Please provide your permit number in box in the upper right hand corner, complete the information in the space provided
below and return the completed renewal form along with the required supplemental information to the address indicated.
Owner Information
* Address to which permit correspondence will be mailed
Owner / Organization Name:
Duke Energy Progress LLC.
Owner Contact:
Paul Draovitch - Senior VP EHS, Operations Support & CCP
Mailing Address:
PO Box 1006
Charlotte, NC 28201
Phone Number:
980-373-0408
Fax Number:
E-mail address:
Paul. [e-mail]
Facility Information
Facility Name:
Mayo Steam Electric Power Plant
Facility Physical Address:
10660 Boston Road
Roxboro, NC 27573
Facility Contact:
Tom Copolo
Mailing Address:
10660 Boston Road
Roxboro, NC 27573
Phone Number:
336-597-7307
Fax Number:
E-mail address:
[e-mail]
Permit Information
Permit Contact:
Lori Tollie
Mailing Address:
2500 Fairfax Road
Greensboro, NC 27407
Phone Number:
336-854-4916
Fax Number:
E-mail address:
[e-mail]
Discharge Information
Receiving Stream:
Mayo Reservoir
Stream Class:
WS-V
Basin:
Roanoke
Sub -Basin:
03-02-05
Number of Outfalls:
3 outfalls - Outfall 006a, Outfall 010, and Outfall 002
Facility/Activity Changes Please describe below any changes to your facility or activities since issuance of your permit. Attached a
separate sheet if necessary.
No changes have occurred in the drainage areas of the three existing outfalls. Duke Energy would like to add the three stormwater outfalls
from the Mayo Monofill (Outfalls 001, 002, & 003) and not renew the NCG120101 permit that the monofill outfalls are currently covered by.
Duke Energy would like to have monofill stormwater outfall 002 changed to outfal 002a to differentiate it from the existing outfall 002 in
the NPDES permit.
CERTIFICATION
I certify that I am familiar with the information contained in the application and that to the best of my knowledge and belief
such information,is true, gQnpAete and accurate.
Signaturey ur Date lall? /At
e M l 4 I?tj t, tj & 0 r M Rf V S-TA-(, o A S
Print or type name of person signing above Title
Please return this completed application form SW Individual Permit Coverage Renewal
Stormwater Permitting Program
and requested supplemental information to: 1612 Mail Service Center
Raleigh, North Carolina 27699-1612

SUPPLEMENTAL INFORMATION REQUIRED FOR RENEWAL OF INDIVIDUAL
NPDES STORMWATER PERMIT
Two copies of each of the following shall accompany this submittal in order for the application
to be considered complete:
(Do not submit the site Stormwater Pollution Prevention Plan)
Initials
LWT 1. A current Site Map from the Stormwater Pollution Prevention Plan. The location of
industrial activities (including storage of materials, disposal areas, process areas and
loading and unloading areas), drainage structures, drainage areas for each outfall,
building locations and impervious surfaces should be clearly noted.
LWT 2. A summary of Analytical Monitoring results during the term of the existing permit
(if your permit required analytical sampling). Do not submit individual lab reports.
The summary can consist of a table including such items as outfall number,
parameters sampled, lab results, date sampled, and storm event data.
LWT 3. A summary of the Visual Monitoring results. Do not submit individual monitoring
reports. The summary can consist of a table including such items as outfall number,
parameters surveyed, observations, and date monitoring conducted.
LWT 4. A summary of the Best Management Practices utilized at the permitted facility.
Summary should consist of a short narrative description of each BMP's in place at
the facility. If the implementation of any BMP's is planned, please include
information on these BMP's.
LWT 5. A short narrative describing any significant changes in industrial activities at the
permitted facility. Significant changes could include the addition or deletion of
work processes, changes in material handling practices, changes in material storage
practices, and/or changes in the raw materials used by the facility.
LWT 6. Certification of the development and implementation of a Stormwater Pollution
Prevention Plan for the permitted facility (Sign and return attached form).
If the final year analytical monitoring of the existing permit term has not been completed
prior to filing the renewal submittal, then the last years monitoring results should be submitted
within 30 days of receipt of the laboratory reports. (i.e. do not withhold renewal submittal
waiting on lab results)

Attachment 1
Site Maps

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Attachment 2
Analytical Monitoring Results

Summary of Analytical Monitoring Data 2017-2020
Mayo Steam Electric Plant
NPDES Permit No. NCS000580
Stormwater
Outfall
Sw 010
Date
Sampled
3/31/2017
11/9/2017
2/4/2018
11/5/2018
3/21/2019
6/18/2019
7/23/2019
10/16/2019
11/12/2019
1/14/2020
9/17/2020
Rainfall
0.94
0.95
0.75
1.75
1.21
1.89
2.03
0.8
0.54
0.49
2.61
pH
6.02
6.02
6.15
6.2
6.09
6.18
6.33
6.46
6.39
6.03
6.52
copper
0.0023
0.0056
0.0056
0.0035
0.00492
0.00511
0.0153
0.00514
0.0046
0.0037
0.00601
selenium
0.00039
0.00082
0.00028
<.00031
<.001
<.001
<.001
<.001
<.001
<.001
<.001
mercury
0.00000803
8.13
0.00000831
0.0000134
0.0000291
0.000021
0.0000416
0.00000464
550
0.0000142
0.00000999
zinc
0.0089
0.0081
0.0177
0.0082
0.019
0.016
0.028
0.005
0.008
0.009
<.005
tss
10.6
4.1
50.5
17.9
150
89
324
4
15
4.1
6.9
oil & grease
<5.0
<1.1
<1.1
<1.1
<5.0
<5.0
<5.0
<5.0
<5.0
<5.0
<5.0
Sulfate
6.4
COD
26
Ca
6600
Additonal Prioritv Pollutant Metals
Stormwater
Outfall
Sw 010
Date
Sampled
3/31/2017
11/9/2017
2/4/2018
11/5/2018
3/21/2019
6/18/2019
7/23/2019
10/16/2019
11/12/2019
1/14/2020
9/17/2020
Ag
<.00007
<.00007
<.00017
<.00007
<.0002
<.0002
<.0002
<.0002
<.0002
0.0002
<.0002
As
0.00044
0.00025
0.00054
0.00042
<.001
<.001
0.00129
<.001
<.001
<.001
<.001
Be
0.000035
0.000014
0.000083
0.000082
<.001
<.001
<.001
<.001
<.001
<.001
<.001
Cd
<.0005
<.0005
0.000045
<.00005
<.001
<.001
<.001
<.001
<.001
<.001
<.001
Cr
0.0017
1 0.00084
0.0051
0.0028
0.00761
0.00534
0.0221
<.001
0.00236
0.00226
0.0017
Ni
0.0017
0.00076
0.0024
0.0019
0.0031
0.00259
0.0113
0.00164
0.00196
0.00154
0.00204
Pb
0.00053
0.00034
0.002
0.0013
0.00316
0.00207
0.00838
<.001
<.001
<.001
<.001
Sb
<.0001
0.00011
0.00015
<.0001
<.0001
<.001
<.005
<.001
<.001
<.001
<.001
TI
1 <.000015
<.000015
1 <.000028
1 <.000015
<.0002
<.0002
<.0002
<.0002
<.0002
<.0002
<.0002
B
1
1 0.0222
1 0.0058
1 0.0117
<.05
1 <.05
1 <.05
<.05
<.05
<.05
<.05

Stormwater
Outfall
SW 006A
Date
Sampled
5/22/2017
11/9/2017
2/4/2018
11/5/2018
3/21/2019
7/23/2019
1/14/2020
9/17/2020
Rainfall
0.79
0.95
0.75
1.75
1.21
2.03
0.49
2.61
pH
6.21
6.02
6.15
6.43
6.15
6.47
6.41
6.39
copper
0.01
0.0056
0.0081
0.0041
0.00446
0.00459
0.00706
0.00272
selenium
0.056
0.00082
0.00026
<.00031
<.001
<.001
<.001
<.001
mercury
0.00000328
5.45
0.00000471
0.0000099
0.0000181
0.00000855
0.0000136
0.00000276
zinc
0.126
0.0049
0.0237
0.0134
0.02
0.007
0.011
0.007
tss
100
4.3
82.5
10
62
5
<2.5
<2.5
oil & grease
3.5
<1.1
<1.1
<1.1
<.5.0
<5.0
<5.0
<5.0
Sulfate
COD
Ca
Stormwater
Outfall
SWO06A
Date
Sampled
5/22/2017
11/9/2017
2/4/2018
11/5/2018
3/21/2019
7/23/2019
1/14/2020
9/17/2020
Ag
<.00007
<.0007
<.00017
<.00007
<.0002
<.0002
0.0002
<.0002
As
0.00027
0.00023
0.00038
0.00029
<.001
<.001
<.001
<.001
Be
<.000010
0.000011
0.000085
0.000048
<.001
<.001
<.001
<.001
Cd
<.00005
<.00005
0.000045
<.00005
<.001
<.001
<.001
<.001
Cr
0.00038
0.00045
0.0058
0.0016
0.00313
<.001
<.001
<.001
Ni
0.00063
0.00093
0.0029
0.0015
0.00194
0.00138
0.00211
<.001
Pb
0.00015
0.00021
0.0024
0,00078
0.00142
<.001
<.001
<.001
Sb
0.00014
<.0001
<.00012
<.0001
<.001
<.001
<.001
<.001
TI
<.000015
<.000015
<.000028
<.000015
<.0002
<.0002
<.0002
<.0002
B
<.05
<.05
<.05
<.05

Stormwater
Outfall
SW 002
Date
Sampled
6/18/2019
7/23/2019
10/16/2019
11/12/2019
1/14/2020
4/20/2020
9/17/2020
10/29/2020
Rainfall
1.89
2.03
0.8
0.54
0.49
0.52
2.61
0.84
pH
7.05
6.53
7.26
7.38
6.97
6.8
6.51
6.74
copper
0.0568
0.0144
0.0057
0.00342
0.00356
0.00357
0.00242
0.00305
selenium
0.00117
<.001
<.001
<.001
<.001
<.001
<.001
<.001
mercury
0.0000699
0.0000143
0.00000149
0.00000322
0.0000035
0.0000176
0.00000844
0.00000375
zinc
0.137
0.018
0.012
0.013
0.008
0.006
0.026
<.005
tss
1300
237
<2.7
9.13
15
24
4.5
<2.5
oil & grease
<5.0
<5.0
<5.0
<5.0
<5.0
<5.0
<5.0
<5.0
Sulfate
COD
Ca
Stormwater
Outfall
SW002
Date
Sampled
6/18/2019
7/23/2019
10/16/2019
11/12/2019
1/14/2020
4/20/2020
9/17/2020
10/29/2020
Ag
<.0002
<.0002
<.0002
<.0002
0.0002
<0.0002
<.0002
<.0002
As
<.005
<.001
<.001
<.001
<.001
<.001
<.001
<.001
Be
0.00101
<.001
<.001
<.001
<.001
<.001
<.001
<.001
Cd
0.001
<.001
<.001
<.001
<.001
<.001
<.001
<.001
Cr
0.0602
0.0155
0.00261
0.00168
0,00245
0.00208
0.00105
<.001
Ni
0.0301
0.00718
0.00136
<.001
0.0027
0.00362
0.00174
0.00146
Pb
0.0191
0.0038
<.001
<.001
<.001
<.001
<.001
<.00146
Sb
<.005
<.001
<.001
<.001
<.001
<.001
<.001
<.001
TI
<.0002
<.0002
<.0002
<.0002
<.0002
<.0002
<.0002
<.0002
B
<.05
<.05
<.05
<.05
<.05
<.05
<.05
<.05

Attachment 3
Summary of Visual Monitoring Data

Summary of Visual Qualitative Monitoring Data 2017-2020
Mayo Steam Electric Plant
NPDES Permit No. NCS000580
Stormwater Outfall
SW 010
Date Sampled
5/22/2017
11/9/2017
1/29/2018
4/24/2018
9/17/2018
11/5/2018
3/21/2019
6/18/2019
7/23/2019
10/16/2019
Color
light tan
light tan
light tan
light tan
tan
light tan
tan
tan
tan
light brown
Odor
none
none
none
none
none
none
none
none
none
none
Clarity
2
2
2
2
3
3
3
4
3
2
Suspended Solids
1
1
1
1
2
1
2
2
2
1
Floating Solids
1
1
1
1
3
1
3
3
3
1
Visable Foam
none
none
none
none
none
none
none
none
none
none
Visable Oil Sheen
none
none
none
none
none
none
none
none
none
none
Indication of
Erosion/Depostion
none
none
none
none
none
none
none
yes
yes
none
Rain Event
Accumulation
1 0.53
1 0.95
1 0.85
1 1.02
1 4.79
1.57
1 1.21
1 1.89
1 2.03
1 0.8
Outfall Status
I active
I active
I active
I active
I active
I active
I active
I active
I active
I active
Stormwater Outfall
SW010
Date Sampled
11/12/2019
1/14/2020
4/20/2020
Color
pale tan
light tan
light tan
Odor
none
none
none
Clarity
2
2
2
Suspended Solids
1
1
1
Floating Solids
1
1
1
Visable Foam
none
none
none
Visable Oil Sheen
none
none
none
Indication of
Erosion/Depostion
none
none
none
Rain Event
Accumulation
1 0.54 1
0.49 1
0.52
Outfall Status
I active I
active I
active

Stormwater Outfall
SW 006A
Date Sampled
2/15/2017
5/22/2017
11/9/2017
1/29/2018
4/24/2018
9/17/2018
11/5/2018
3/21/2019
1/14/2020
4/20/2020
Color
light tan
light tan
light tan
light tan
light tan
tan
light tan
tan
light tan
clear
Odor
none
none
none
none
none
none
none
none
none
none
Clarity
1
1
2
1
2
3
3
2
2
1
Suspended Solids
1
1
1
1
1
2
1
2
1
1
Floating Solids
1
1
1
1
1
3
1
2
1
1
Visable Foam
none
none
none
none
none
none
none
none
none
none
Visable Oil Sheen
none
none
none
none
none
none
none
none
none
none
Indication of
Erosion/Depostion
none
none
none
none
none
none
none
none
none
none
Rain Event
Accumulation
0.19
0.53
0.95
0.85
1.02
4.79
1.57
1.21
0.49
0.52
Outfall Status
active
active
active
active
active
active
active
I active
active
active
Stormwater
Outfall
SW 002
Date Sampled
10/16/2019
11/12/2019
1/14/2020
4/20/2020
Color
clear
pale tan
pale tan
light tan
Odor
none
none
none
none
Clarity
1
1
2
2
Suspended Solids
1
1
1
1
Floating Solids
1
1
1
1
Visable Foam
none
none
none
none
Visable Oil Sheen
none
none
none
none
Indication of
Erosion/Depostion
none
none
none
none
Rain Event
Accumulation
0.8
0.54
0.49
0.52
Outfall Status
active
active
active
active
Notes: Outfall 002 added to permit effective March 21, 2019

Attachment 4
Summary of Best Management Practices

3.2.3.1 Nonstructural
Best Management Practices (BMP's) are methods, procedures, processes, prohibitions of
practices and other management controls which serve to eliminate, mitigate, or reduce
pollutant loadings in storm water discharges. Examples of BMP's for the Mayo Electric
Generating Plant include:
• Source Reduction
• Good Housekeeping
• Preventive Maintenance
• Visual Inspections
• Spill Prevention and Response
• Erosion and Sediment Control
• Storm Water Runoff Management
• Employee Training
• Recordkeeping and Reporting
• Recycling
• Treatment
3.2.3.2 Source Reduction
Source reduction measures reduced storm water pollution by reducing the quantity of
materials, which may contact storm water. The source reductions measures to be
implemented may require modifications in present work habits and practices. Example
components of source reduction are:
• Good Housekeeping
• Preventive Maintenance
• Visual Inspections
• Spill Prevention and Response
• Erosion and Sediment Control
Many of the components of source reduction are addressed as main components of the
BMP, therefore, source reduction should be considered under each of the other BMP
components.
ERM NC, INC. 3-4 398458

3.2.3.3 Good Housekeeping
Good housekeeping practices are designed to maintain a clean and orderly work
environment. Good housekeeping practices should be incorporated in the day-to-day
conduct of operations and maintenance. A clean and orderly work area reduces the
possibility of accidental spills caused by the mishandling of chemicals and equipment.
Well -maintained material and chemical storage areas reduce the possibility of storm
water mixing with pollutants. The following practices shall be performed on a regular
basis:
• Maintain clean and dry floors, ground surfaces, work, and process areas through
the use of brooms, shovels, vacuum cleaners, mops and cleaning equipment.
• Regular pickup and disposal of waste materials.
• Proper operation of equipment.
• Routine visual inspections by qualified personnel for leaks or spills, and for
conditions which may lead to a leak or spill (such as the hazardous waste
inspections being performed at various areas throughout the Mayo Plant).
• Training of employees in spill prevention and cleanup procedures.
• Bags storing dry chemicals shall be raised off the floor, preferably by pallet, to
prevent any unwanted interaction of the chemical with water.
• Walkways shall be maintained free of obstructions to facilitate inspection for
leaks or spills.
The Fossil Chemistry Technician assigned the ORC duties routinely inspects work and
storage areas for best housekeeping practices. Corrections are handled by work orders
tracked through Maximo, the Company work order management system, on an as
needed basis.
3.2.3.4 Preventive Maintenance
Mayo Plant has various inspections and site assessment practices in place to assist with
detection of potential problems. Preventive maintenance schedules vary based on the
potential risk by the source. In general, the Mayo Plant is well manned in order to
ensure the facility is a reliable and efficient source of electricity.
Preventive maintenance will be performed to ensure that storm water management
facilities and controls operate correctly and effectively and to reduce their breakdowns
and failure. Specific activities include:
• Periodic inspection, cleanout and maintenance of catch basins, containment
areas, ditches, and conveyance equipment.
• Periodic scheduled inspection and testing of equipment and systems, including
pumps, valves, pipes, storage tanks, and controls.
• Proper scheduled maintenance of equipment and facilities.
Additional preventive maintenance information will be provided as a separate section
of the SPPP.
ERM NC, INC. ' 5 3%4-%

3.2.3.5 Visual Inspections
Visual inspections will be performed in conjunction with other BMP's, such as
housekeeping and preventive maintenance, and also as a separate activity (see section
3.5 "Facility Inspection").
3.2.3.6 Spill Prevention and Response
Spill prevention will be achieved by good housekeeping, visual inspection, and
preventive maintenance, and through training of personnel in material handling and
storage procedures, and the use of equipment. Training in proper spill identification
and cleanup procedures, including the use of equipment and the notification and
documentation procedures, will be the main components of spill response. Specific
spill preventative measures will include:
• Piping protection, such as routing, coatings and wrappings, and cathodic protection
where appropriate.
• Adherence to current unloading procedures and practices, including monitoring
and verification of all connections and seals.
• Proper valve and control settings, and adequate labels, markings, and
communications, to ensure that accidental closures or openings do not occur.
• Adequate securities to prevent non -authorized access to facilities.
• Appropriate documentation of actions taken.
Spill response will be in accordance with existing Plant Procedures, including the Spill
Prevention, Control and Countermeasure (SPCC) Plan and the Hazardous Substance
Notification Procedure. Training is essential to a well -executed spill response.
Personnel will be trained to identify potential storm water pollution occurrences as may
occur during a spill event, and respond in the appropriate manner.
3.2.3.7 Erosion and Sediment Control
Areas under construction, or where accelerated erosion or sedimentation is occurring,
will be monitored and corrective measures will be implemented as necessary. A
Sediment Erosion Control Plan may be needed. The Environmental Site Coordinator
will decide. Vegetation or equivalent stabilization of the ground will be performed to
reduce/eliminate accelerated erosion.
3.2.3.8 Storm Water Runoff Management
Uncontaminated storm water will be diverted away from potential sources of
contamination, and discharged to a stabilized conveyance structure. Contaminated
waters will be directed to the appropriate treatment facilities prior to discharge.
Diversion efforts should be made to reduce the quantity of contaminated storm water
ERM NC, INC. 3-6 399458

that must be collected and treated depending on conditions. Vehicle washing should be
performed in areas away from storm water drains.
3.2.3.9 Employee Training
General training of employees will emphasize good housekeeping, and preventive
methods, procedures, and practices. Responsibilities will be clearly communicated to
personnel, including notification procedures for preventive and corrective measures.
Maintenance and inspection personnel will have the authority to follow-up on areas
requiring improvement. Plant personnel will trained to in safety and cleanup
operations, and recognize spill which may contribute to storm water pollution.
3.2.3.10 Recordkeeping and Reports
Training documentation will utilize the current training documentation tool.
Maintenance activities will be documented in the current Maximo work management
tool. Reports will be sent to the plant file 12520R located in the Environmental
Coordinator's Office.
3.2.3.11 Recycling
No recycling of contaminated storm water occurs at the Mayo Plant. Recycling of some
solid and universal wastes occurs at the Mayo Plant.
3.2.3.12 Treatment
Treatment measures will be the last step prior to the discharge of contaminated storm
water. Treatment is employed at the plant for those areas where, due to site constraints,
other BMP's have been found to be infeasible or too costly to implement. Periodic
vacuuming of storm drain catch basins will be conducted in high risk areas as needed.
ERM NC, INC. 3-7 39R58

Attachment 5
Narrative of Significant Site Changes
The most significant industrial changes at the site since permit
issuance on January 17, 2017 include the following:
Completion of all process water redirect work including
grading to remove all process flows from the ash basin to a
newly constructed lined retention basin. This project included
the rerouting and demolition of former SW outfalls 004 and
005 completed in May of 2019. These two outfalls were
included in the NPDES Industrial Stormwater permit issued
January 17, 2017 but were later placed in the August 1, 2018
NPDES Wastewater permit due to the constituents in the
discharge.

Attachment 6
Certification of Development and Implementation of
Stormwater Pollution Prevention Plan

STORMWATER POLLUTION PREVENTION PLAN
DEVELOPMENT AND IMPLEMENTATION
CERTIFICATION
North Carolina Division of Energy, Mineral, and Land Resources - Storm water Permitting
Facility Name:
Permit Number:
Location Address
Mayo Steam Electric Plant
NCS000580
10660 Boston Road
Roxboro, NC 27573
County: Person
"I certify, under penalty of law, that the Stormwater Pollution Prevention Plan (SPPP) document and all
attachments were developed and implemented under my direction or supervision in accordance with a system
designed to assure that qualified personnel properly gather and evaluate the information required by the SPPP.
Based on my inquiry of the person or persons who manage the system, or those persons directly responsible
for gathering the information, the information gathered is, to the best of my knowledge and belief, true,
accurate and complete."
And
"I certify that the SPPP has been developed, signed and retained at the named facility location, and the SPPP
has been fully implemented at this facility location in accordance with the terms and conditions of the
stormwater discharge permit."
And
"I am aware that there are significant penalties for falsifying information, including the possibility of fines and
imprisonment for knowing violations."
Sign (according to permit signatory requirements) and return this Certification. DO NOT
SEND STORMWATER POLLUTION PREVENTION PLAN WITH THIS CERTIFICATION.
Signature
-- —i- M Po t-e
Print or type name of person signing above
Date _ l al01ae
6-A \11 - QEv S-r&-r"aaS
Title
SPPP Certification 10/13

Attachment 7
Fish Tissue Monitoring Results

Reference for Tissue Monitoring Species Composition Changes
Prior to 2019, the Mayo Reservoir Trace Element fish sampling program focused on plant operations in respect to
sustainable fish populations. With the implementation of flue gas desulfurization, zero liquid discharge system and
ash basin modifications, water column and fish tissue concentration for various metals have declined since 2014.
Prior to 2019, catfish species were included as part of the monitoring program to evaluate metals concentrations
across multiple trophic levels. Catfish were removed from the Mayo monitoring program in starting in 2019 due
to continued low metals (As, Hg, Se) concentrations in Mayo surface waters and fish tissues. Species collected
from 2019 on include Largemouth Bass (Micropterus solmoides), and sunfish (Lepomis spp.) based on
annual Fish Tissue Monitoring Plans approved by the Water Sciences Section of the North Carolina
Division of Water Resources.

Sample Date
Location
Fish Species
Length
Weight
As
(µg/g)
Se
(µg/g)
Hg
(µg/g)
Dry -to fresh
weight
ratio
4/26/2017
G_1
Largemouth Bass
295
342
0.2
4.3
1.04
0.21
4/26/2017
G 3
Largemouth Bass
320
500
0.2
5
1.05
0.21
4/26/2017
G 3
Largemouth Bass
331
498
0.2
4.7
1.02
0.20
4/26/2017
G 3
Largemouth Bass
294
340
0.3
4.2
0.73
0.22
4/26/2017
G_3
Largemouth Bass
323
460
0.2
4.4
0.89
0.21
4/26/2017
G 3
Largemouth Bass
320
438
0.2
5.1
0.89
0.20
4/27/2017
E 1
Bluegill
167
96
0.3
7.1
0.68
0.19
4/27/2017
E 1
Largemouth Bass
340
546
0.2
8.8
0.66
0.21
4/27/2017
E 1
Largemouth Bass
300
398
0.2
6.6
0.86
0.21
4/27/2017
E 1
Largemouth Bass
377
755
0.2
7.4
1.01
0.21
4/27/2017
E 1
Largemouth Bass
318
410
0.2
5.8
0.5
0.21
4/27/2017
E_1
Largemouth Bass
367
642
0.2
7
1.02
0.20
4/27/2017
E 1
Largemouth Bass
304
398
0.2
7.4
0.82
0.20
4/27/2017
E 3
Bluegill
166
81
0.2
6.1
0.47
0.20
4/27/2017
B 3
Largemouth Bass
320
420
0.2
7.9
0.67
0.21
4/27/2017
B 3
Largemouth Bass
383
684
0.4
10.3
1.23
0.21
4/27/2017
B_3
Largemouth Bass
405
842
0.2
8.5
1.14
0.21
4/27/2017
B 3
Largemouth Bass
369
684
0.2
10.4
0.91
0.21
4/27/2017
B_3
Largemouth Bass
400
954
0.2
10.2
1.09
0.21
4/27/2017
B_1
Largemouth Bass
411
848
0.2
14.4
1.25
0.19
5/25/2017
G_3
Bluegill
221
212
0.2
5
1.36
0.18
5/25/2017
B 1
Flat Bullhead
271
229
0.2
7.1
0.46
0.18
5/25/2017
B_1
Flat Bullhead
232
170
0.2
6.9
0.74
0.18
5/25/2017
B 1
Flat Bullhead
270
254
0.2
7.1
0.79
0.19
5/25/2017
B_1
Flat Bullhead
245
200
0.2
7.3
0.31
0.19
5/25/2017
B_1
Flat Bullhead
300
320
0.2
7.4
0.49
0.18
5/25/2017
B_1
Flat Bullhead
265
202
0.2
9.2
0.37
0.18
5/25/2017
G 1
Flat Bullhead
304
353
0.2
2
0.89
0.19
5/25/2017
G 1
Flat Bullhead
272
220
0.2
3.7
0.46
0.16
5/25/2017
G_1
Flat Bullhead
281
260
0.2
2.4
1.17
0.17
5/25/2017
G 1
White Catfish
411
856
0.2
2.3
1.07
0.19
5/25/2017
G 1
White Catfish
335
550
0.2
0.9
0.46
0.17
5/25/2017
G 1
White Catfish
415
946
0.2
2.2
0.39
0.18
5/25/2017
B_3
Largemouth Bass
403
934
0.2
11.6
1.86
0.20
5/25/2017
B 1
Bluegill
161
70
0.2
8
1 0.46
0.18
5/25/2017
B 1
Bluegill
142
47
0.2
7.9
0.66
0.19
5/26/2017
G 1
Bluegill
207
198
0.2
3
0.96
0.20
5/26/2017
E 1
Bluegill
170
93
0.2
5.3
0.48
0.19
5/26/2017
E 1
Brown Bullhead
340
592
0.2
1.6
0.27
0.18
5/26/2017
E 1
Brown Bullhead
315
457
0.2
1.1
0.37
0.19

Sample Date
Location
Fish Species
Length
Weight
As
W/O
Se
W/O
Hg
(µg/g)
Dry -to fresh
weight
ratio
5/26/2017
E_3
Bluegill
166
92
0.2
5
0.86
0.17
5/26/2017
E 3
Bluegill
175
109
0.2
3.9
0.45
0.19
5/26/2017
E 3
Bluegill
159
87
0.2
4.8
0.35
0.18
5/26/2017
E 3
Flat Bullhead
286
258
0.2
2.9 1
0.62
0.18
5/26/2017
E 3
Flat Bullhead
305
322
0.2
4.3
0.35
0.19
5/26/2017
E 3
Flat Bullhead
301
325
0.2
2.8
0.38
0.19
5/26/2017
E 3
Flat Bullhead
280
265
0.2
3.3
0.52
0.18
6/29/2017
G 1
Bluegill
198
143
0.2
3.6
1.07 1
0.19
6/29/2017
G 1
Bluegill
179
104
0.2
4.6
0.88
0.18
6/29/2017
G 1
Bluegill
199
133
0.2
4
0.54
0.17
6/29/2017
G 1
Bluegill
165
86
0.2
4.2
0.52
0.19
6/29/2017
B_3
Flat Bullhead
310
361
0.2
6.6
0.29
0.17
6/29/2017
B_3
White Catfish
365
660
0.2
3
0.39
0.16
6/29/2017
B 3
White Catfish
396
929
0.2
4
0.69
0.17
6/29/2017
B_3
White Catfish
439
1016
0.2
1.6
1 0.78
0.18
6/29/2017
B 3
Yellow Bullhead
289
312
0.2
5.1
0.75
0.18
8/22/2017
B_3
Bluegill
145
62
0.6
13.3
0.56
0.20
8/22/2017
B 3
Bluegill
192
130
0.2
5.5
0.44
0.17
8/22/2017
B_3
Bluegill
148
72
0.6
8.6
0.46
0.20
8/22/2017
B 3
Bluegill
158
76
0.9
9.1
0.41
0.23
8/22/2017
B_3
Bluegill
164
84
0.8
9.2
0.54
0.22
8/22/2017
B_3
Bluegill
153
60
0.5
8.2
0.52
0.21
8/22/2017
B 3
Brown Bullhead
181
76
0.2
3.1
0.27
1 0.19
8/22/2017
B 1
Bluegill
151
75
0.3
7.1
0.69
0.22
8/22/2017
B 1
Bluegill
148
56
0.4
6.7
0.82
0.19
8/22/2017
B 1
Bluegill
173
120
0.4
7.3
0.44
0.21
8/22/2017
B 1
Bluegill
168
91
0.2
8.4
0.27
0.20
8/22/2017
B_1
Largemouth Bass
290
352
0.2
5.9
0.45
0.22
8/22/2017
B_1
Largemouth Bass
228
157
0.2
6.9
0.43
0.21
8/22/2017
B 1
Largemouth Bass
322
476
0.2
8.1
0.92
0.21
8/22/2017
B 1
Largemouth Bass
225
142
0.2
6.7
0.72
0.21
8/22/2017
B 1
Largemouth Bass
1 177
78
1 0.2
1 4.7
1 0.71
0.20

Sample Date
Location
Fish Species
Length
Weight
As
(Pg/g)
Se
(N/g)
Hg
(Ng/g)
Dry -to fresh
weight
ratio
4/3/2018
B 1
Largemouth Bass
373
814
0.23
4.3
0.98
0.19
4/3/2018
B 1
Largemouth Bass
342
644
0.27
6.3
1.2
0.18
4/3/2018
B_1
Largemouth Bass
367
762
0.22
5.5
1.1
0.19
4/3/2018
B_1
Largemouth Bass
410
983
0.5
7.3
1 0.87
0.18
4/3/2018
B 1
Largemouth Bass
374
744
0.23
4.7
0.72
0.20
4/3/2018
B_1
Yellow Bullhead
266
264
0.5
4.8
0.19
0.18
4/3/2018
B 3
White Catfish
341
550
0.67
7.1
0.17
0.16
4/3/2018
B 3
White Catfish
316
458
0.59
6.6
0.21
0.17
4/3/2018
B 3
White Catfish
301
408
0.52
9.4
0.14
0.20
4/3/2018
B 3
White Catfish
316
460
0.74
6.7
0.39
0.19
4/3/2018
G 3
Flat Bullhead
282
295
0.5
1.9
0.44
0.19
4/3/2018
G 3
Flat Bullhead
281
275
0.5
2
0.33
0.16
4/3/2018
G_3
Flat Bullhead
285
302
0.49
2.2
0.28
0.19
4/3/2018
G 3
Flat Bullhead
260
217
0.5
1.4
0.61
0.19
4/3/2018
G 3
Flat Bullhead
276
282
0.5
1.8
0.31
0.17
4/3/2018
G 3
Flat Bullhead
280
278
0.49
1.8
0.38
0.17
4/3/2018
G_3
Largemouth Bass
363
765
0.16
3.4
1.1
0.20
4/3/2018
G 3
Largemouth Bass
347
694
0.21
3
0.89
0.19
4/3/2018
B 1
Largemouth Bass
343
600
0.3
5.7
0.61
0.21
4/4/2018
B 1
Flat Bullhead
313
400
0.5
3.8
0.32
0.18
4/4/2018
B 3
Largemouth Bass
385
827
0.24
5.5
0.96
0.20
4/4/2018
B 3
Largemouth Bass
388
905
0.32
8
2.2
0.17
4/4/2018
B_3
White Catfish
333
510
0.43
7.5
0.27
0.19
4/4/2018
B_3
White Catfish
283
380
0.69
6.8
0.16
0.18
4/4/2018
G 1
Largemouth Bass
333
540
0.5
3.4
1.2
1 0.20
4/4/2018
G 1
Largemouth Bass
375
832
0.16
3.5
1.2
0.20
4/4/2018
G 1
Largemouth Bass
301
394
0.49
3.1
0.95
0.20
4/4/2018
G 1
Largemouth Bass
341
604
0.5
3.4
1.4
0.20
4/4/2018
G 3
Bluegill
164
87
0.5
2.1
0.34
0.18
4/4/2018
G 3
Bluegill
170
80
0.37
3.6
0.19
0.18
4/5/2018
B 3
Largemouth Bass
370
745
0.22
6.7
0.56
0.20
4/5,/2018
B 3
Largemouth Bass
388
940
0.26
4.3
0.59
0.22
5/22/2018
B 3
Bluegill
214
214
0.25
5
0.42
0.16
5/22/2018
B 3
Largemouth Bass
405
770
0.3
6.8
1.8
0.19
5/22/2018
B 3
Largemouth Bass
400
948
0.27
6.9
1 0.96
0.19
10/29/2018
B 1
Bluegill
186
119
0.45
5.9
0.19
0.18
10/30/2018
G 3
Bluegill
183
109
0.36
2.8
0.29
0.19
10/30/2018
G 3
Bluegill
186
112
0.26
2.8
0.47
0.18
10/30/2018
G_3
Bluegill
167
77
0.5
2.5
0.35
0.19

Sample Date
location
Fish Species
Length
Weight
As
(µg/g)
Se
(ig/g)
Hg
(ig/g)
Dry -to fresh
eigh
rati
10/30/2018
G 3
Bluegill
181
95
0.5
2.3
0.23
0.19
10/30/2018
B_1
Bluegill
205
154
0.51
6
0.32
0.19
10/30/2018
B 3
Bluegill
182
100
0.48
4.2
0.18
0.19
10/30/2018
B 3
Bluegill
177
95
0.58
6.2
0.15
1 0.20
10/30/2018
B 3
Bluegill
177
95
0.35
5.4
0.4
0.18
10/30/2018
B_3
Bluegill
179
99
0.54
4.8
0.22
0.19
10/30/2018
B 3
Bluegill
164
75
0.55
6.2
0.19
0.20
11/19/2018
B 1
Bluegill
214
180
0.4
5.4
0.51
0.18
11/19/2018
B_1
Bluegill
188
103
0.56
6.6
0.28
0.18
11/19/2018
B_1
Bluegill
201
138
0.5
4.2
0.18
0.20
11/19/2018
B 1
Bluegill
179
91
0.63
6.2
0.18
0.19
11/19/2018
B 1
Flat Bullhead
242
155
0.33
4.2
0.14
0.18
11/19/2018
B 1
Flat Bullhead
283
288
0.23
4.3
0.32
0.19
11/19/2018
B 1
Flat Bullhead
253
212
0.16
3.3
0.28
0.17
11/19/2018
B 1
Flat Bullhead
249
188
0.32
3
0.3
0.17

Sample Date
Location
Fish Species
Length
Weight
As
(119/9)
Se
(µg/g)
Hg
(µg/g)
Dry -to fresh
weight
ratio
4/3/2019
B_3
Redear Sunfish
227
181
0.83
9.22___+_
0.3
0.21
4/3/2019
B_3
Redear Sunfish
212
139
0.9
7.45
0.3
0.20
4/3/2019
B_3
Redear Sunfish
220
150
0.85
5.93
0.3
0.20
4/3/2019
B 3
Redear Sunfish
240
215
0.8
5.47
0.31
0.21
4/3/2019
B 3
Redear Sunfish
236
200
0.93
6.63
0.37
0.19
4/3/2019
B_3
Redear Sunfish
246
225
0.79
7.64
0.3
0.19
4/3/2019
B_1
Largemouth Bass
377
774
0.92
7.05
0.71
0.20
4/3/2019
B_1
Largemouth Bass
361
728
0.87
5.91
0.86
0.21
4/3/2019
6 1
Redear Sunfish
237
190
0.95
9.21
0.5
0.20
4/3/2019
B 1
Redear Sunfish
233
175
1.12
7.55
0.41
0.19
4/3/2019
B 1
Redear Sunfish
249
218
0.82
12.23
0.3
0.19
4/3/2019
B_1
Redear Sunfish
231
171
1.07
7.19
0.59
4/4/2019
G_1
Largemouth Bass
346
684
0.84
4.15
1.02
_-0.17
0.20
4/4/2019
G 1
Redear Sunfish
195
105
0.86
3.99
1.27
0.18
4/4/2019
G 1
Redear Sunfish
205
123
0.81
4.37
1.34
0.18
4/4/2019
G 1
Redear Sunfish
226
151
0.87
4.78
0.91
0.17
4/4/2019
G 3
Largemouth Bass
320
424
0.9
3.54
0.7
0.21
4/4/2019
G 3
Largemouth Bass
336
556
0.86
3.41
0.68
0.22
4/4/2019
G 3
Largemouth Bass
354
665
1.11
3.46
0.91
0.21
4/4/2019
G 3
Largemouth Bass
379
814
0.93
3.47
0.93
0.20
4/4/2019
G 3
Largemouth Bass
341
629
0.96
3.4
0.73
0.21
4/4/2019
G 3
Redear Sunfish
210
146
0.89
4.73
0.32
0.19
4/4/2019
G 3
Redear Sunfish
225
181
1.02
4.2
0.4
0.19
4/4/2019
G_3
Redear Sunfish
208
137
0.85
4.6
0.3
0.20
5/8/2019
B_1
Redear Sunfish
245
233
0.95
11.66
0.8
0.20
5/8/2019
B_1
Redear Sunfish
195
111
0.98
8.77
0.36
0.20
5/9/2019
B_3
Largemouth Bass
405
758
1.06
9.17
1.79
0.21
5/9/2019
B_3
Largemouth Bass
381
739
1.01
6.68
0.79
0.17
5/9/2019
B 3
Largemouth Bass
370
702
0.89
7.24
0.66
0.19
5/9/2019
B 3
Largemouth Bass
305
391
0.99
1 6.37
0.55
0.21
5/9/2019
B 3
Largemouth Bass
354
518
0.85
6.84
0.65
0.21
5/9/2019
B 3
Largemouth Bass
355
636
0.97
4.8
0.63
0.20
5/9/2019
BT1
Largemouth Bass
368
613
0.91
5.14
0.71
0.21
5/9/2019
B 1
Largemouth Bass
290
333
1.02
4.94
0.42
0.21
5/9/2019
B 1
Largemouth Bass
415
1120
0.88
1 6.36
1 0.94
0.20
5/9/2019
B_1
Largemouth Bass
390
849
0.91
1 7.87
1 0.88
0.21

vtRGiNIA Mayo Crook
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NORTH CAROLINA

Attachment 8
NPDES General Permit Renewal Guidance Letter
with updated NCG120101 results

jf DUKE
d
ENERGY®
File: Mayo12520-R
Ms. Bethany Georgoulias
North Carolina Division of Environmental Quality
1628 Mail Service Center
Raleigh, NC 27699-1628
Subject: Duke Energy Progress, LLC.
Mayo Electric Generating Plant
NPDES General Permit Renewal Guidance
NCG 120101
Dear Ms. Georgoulias:
September 6, 2018
Duke Energy
2500 Fairfax Road
Greensboro, NC 27407
As recently discussed, Duke Energy requests guidance and clarification on the renewal of the
NCG120101 general stormwater permit for the Mayo Steam Plant Monofill. The initial certificate of
coverage was issued to Duke Energy on January 6, 2014. Coverage under this general permit was issued
with amended conditions requiring additional sampling. Please advise if the renewal of the general permit
will continue to require this augmented sampling schedule.
The NCG120101 has been problematic with the requirement to monitor fecal coliform due to the
abundant wildlife around the monofill. Duke Energy sought and received tier relief from monthly
monitoring of fecal coliform from DEQ in December of 2017. Unlike the sanitary landfills the
NCG12000 permit was developed for, the Mayo Monofill receives only coal combustion residuals with
wildlife being the only possible source of fecal contamination.
Duke Energy plans to request a modification of NPDES Industrial Stormwater Permit NCS000580 in the
near future to include the three stormwater outfalls at the Mayo Monofill currently covered by permit
NCG120101. The industrial activity at the monofill, transport of materials, is similar in nature to the
activity at the Station's stormwater outfal1010.
As you requested, included with this correspondence is all stormwater sampling data gathered under
permit NCG 120101 to date from the Mayo Monofill for your review. Should you have any questions
please contact me at [e-mail] or at 1-336-8544916.
Sincerely, ��
,Ld4G /B ��jj��l.2
Lori Tollie

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