NC0081957_Draft Permit_20200616

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ROY COOPER u( _ ji
Governor /Z
MICHAEL S.REGAN ,. •/
Secretary '-* a,.ww,,*
S.DANIEL SMITH NORTH CAROLINA
Director Environmental Quality
June 16, 2020
Mr. Paul Tran, South East Regional Manager
Cube Yadkin Generation LLC
P.O. Box 575
Badin,NC 28009
Subject: Draft NPDES Permit Renewal
Permit NC0081957
Narrows Powerhouse
Stanly County
Grade I Physical-Chemical WPCS
SIC Code 4911
Dear Mr. Tran:
Enclosed with this letter is a copy of the Draft NPDES permit renewal for your facility. Please
review this draft carefully to ensure thorough understanding of the requirements and conditions it 1
contains. There are several changes from the existing permit, including the following:
• Some of the wording changed in Special Condition A. (4.), Electronic Reporting — Discharge
Monitoring Reports;please review each paragraph carefully.
The NPDES standard conditions(Parts II,III,and IV)that are a part of the permit are not included
in this draft document (cover, map, and Part I). The conditions are the same as in your current
permit except that agency and division names have been updated.The latest version is available at
https://bit.ly/2BZ4xxx and can be viewed online or downloaded as a PDF file.
Concurrent with this notification the Division is publishing a notice in a newspaper having
circulation in the general Stanly County area, soliciting public comments on this draft permit.
Please provide any written comments you may have to the following:NCDEQ/DWR,NPDES
Permitting Branch, 1617 Mail Service Center, Raleigh,NC 27699-1617 no later than 30 days
after receipt of this draft permit.
Following the 30-day public comment period, the Division will review all pertinent comments
and take appropriate action prior to issuing a final permit. If you have questions concerning this
draft permit, please call me at(919) 707-3613 or by email at [e-mail].
Sincerely,
Cassidy Kurtz, Engineer
NPDES Complex Permitting Unit
_E Q m Eno Quality I e
v512 NorthNorthCarolina SalisburyDepart Streetent 1of 1617 Mailvir Servicenmental Center I RaleighDivision,NorthofWater CarolinaR sources 27699-1617
^+� � 61 / 4 919.707.9000

Hardcopy: NPDES Files
Ecopy: DWR/Mooresville Regional Office/Water Quality/Cory Basinger
DWR/Operator Certification Program/Maureen Kinney
DWR/Public Water Supply/Clinton Cook
Page 2 of 2

Permit NC0081957
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
DRAFT PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,
Cube Yadkin Generation LLC
is hereby authorized to discharge wastewater from a facility located at the
Narrows Powerhouse
37720 Pine Street
Albemarle
Stanly County
to receiving waters designated as Yadkin River in the Yadkin-Pee Dee River Basin in accordance with
effluent limitations, monitoring requirements, and other applicable conditions set forth in Parts I, II,
III and IV hereof.
This permit shall become effective Month DD, 2020.
This permit and authorization to discharge shall expire at midnight on January 31, 2025
Signed this day Month DD, 2020.
DRAFT
S. Daniel Smith, Director
Division of Water Resources
By Authority of the Environmental Management Commission

Permit NC0081957
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.
Cube Yadkin Generation LLC is hereby authorized to:
1. Continue to discharge once-through cooling waters from outfalls 001, 002, 005, 006, and 007,
water from a sump drain (Outfall 003) located at Narrows Powerhouse [37720 Pine Street,
Albemarle] Stanly County, and
2. Discharge from said treatment works at the location specified on the attached map into the
Yadkin River which is classified as class WS-IV and B waters in the Yadkin-Pee Dee River
Basin.
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Page 2 of 8

Permit NC0081957
Part I
A. (1.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[001 /002/005/006/007]
[15A NCAC 02B.0400 et seq., 15A NCAC 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 once-through cooling water from outfalls 001,002,005,006,
and 007. Such discharges shall be limited and monitored3 by the Permittee as specified below:
PARAMETER EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Maximum Measurement Sample Sample
PARAMETER CODE Average Frequency Type Location*
Flow(MGD) 50050 Annual Estimate Effluent
Temperature 00010 Annual Grab Effluent
(°C)1
pH 2 00400 Between 6.0 and 9.0 standard units Annual Grab Effluent
NOTES:
* Effluent or at the point closest to discharge where a representative sample of the discharge
can feasibly be obtained.
1. The temperature of the effluent will be regulated so that the temperature of the receiving
stream does not increase by more than 2.8 °C above the natural water temperature. In no
case should the receiving stream temperature exceed 32°C due to the facility's operation.
Temperature of the effluent may be obtained anywhere downstream of the heat exchanger
effluent that is representative of the discharge.
2. The pH of the effluent shall not be less than 6.0 standard units nor greater than 9.0 standard
units,unless ambient river conditions prevent compliance with this range.
3. The permittee shall submit discharge monitoring reports electronically using the
Division's eDMR system. See Special Condition A. (4.).
Monitoring results obtained during the calendar year shall be recorded and reported on a Discharge
Monitoring Report(DMR) form and postmarked no later than January 30th following the completed
reporting period. Samples obtained for monitoring purposes may be collected anytime during the
calendar year.
There shall be no discharge of floating solids or visible foam (other than trace amounts) in the effluent,
unless ambient river conditions prevent compliance.
Pageof 8
3

Permit NC0081957
A. (2.) BIOCIDE CONDITION
[G.S. 143-215, 143-215.1]
There shall be no chromium,zinc or copper added to the treatment system except as pre-
approved additives to biocidal compounds.
The permittee shall obtain approval from the Division's Aquatic Toxicology Unit prior to the use of
any biocide(not previously approved by the Division) in the effluent discharged under this permit.
Approval for use of any biocide not previously approved should be requested at least 90 days in
advance of any planned usage.
Contact the Aquatic Toxicology Unit for detailed instructions on requesting approval of biocides:
NC DEQ/DWR/Aquatic Toxicology Unit
1621 Mail Service Center
Raleigh,North Carolina 27699-1621
Page 4 of 8

Permit NC0081957
A. (3.)EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [003]
[15A NCAC 02B.0400 et seq., 15A NCAC 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 sump water from outfall 003 [Sump Drain]. Such discharges
shall be limited and monitored3 by the Permittee as specified below:
PARAMETER EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS Monthly Daily Maximum Measurement Sample Sample
PARAMETER CODE Average Frequency Type Location*
Flow(MGD) 50050 Annual Estimate Effluent
Oil and Grease 1 00556 15.0 mg/L 20.0 mg/L Annual Grab Effluent
pH 2 00400 Between 6.0 and 9.0 S.U. Annual Grab Effluent
NOTES:
* Effluent or at the point closest to discharge where a representative sample of the discharge
can feasibly be obtained.
1. The tailrace shall be visually inspected for oil sheen attributed to facility operations on a
weekly basis in conjunction with inspections of the floor sump and rope skimmer.
Confirmation that a visual inspection was conducted shall be recorded in the operating
log for the facility and provided to the Division upon request.
2. The pH of the effluent shall not be less than 6.0 standard units or greater than 9.0 standard
units,unless ambient river conditions prevent compliance with this range.
3. The permittee shall submit discharge monitoring reports electronically using the
Division's eDMR system. See Special Condition A. (4.).
Best Management Practices(BMPs) must be employed to ensure that excessive pollutants are
not discharged to the surface water of the state. These practices should include as a minimum,
routine maintenance of the rope skimmer type oil/water separator and cleaning accumulated
sediment in the bottom of the sump annually.
Chemical wheel pit cleaning is permitted on a monthly basis. When wheel pit cleaning occurs,
the tailrace shall be inspected visually for foam and oil. Cleaning shall be conducted only with
pre-approved solvents. Should the Permittee wish to change solvents,a written request should
be made to the Division including the MSDS for the proposed solvent.
Mechanical cleaning operations which do not contribute any wastewater to the discharge are not
limited by this permit. Non-discharging cleaning operations may be conducted as often as
necessary to ensure safety and proper facility operation.
Monitoring results obtained during the calendar year shall be recorded and reported on a
Discharge Monitoring Report(DMR) form and postmarked no later than January 30th
following the completed reporting period. Samples obtained for monitoring purposes may be
collected anytime during the calendar year.
There shall be no discharge of floating solids or visible foam(other than trace amounts) in the
effluent,unless ambient river conditions prevent compliance.
Page 5 of 8

Permit NC0081957
A. (4.) ELECTRONIC REPORTING -DISCHARGE MONITORING REPORTS
[G.S. 143-215.1 (b)]
Federal regulations require electronic submittal of all discharge monitoring reports(DMRs) and
program reports. The final NPDES Electronic Reporting Rule was adopted and became effective on
December 21, 2015.
NOTE: This special condition supplements or supersedes the following sections within Part 1I 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)l
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. The eDMR system may be
accessed at: https://deq.nc.gov/about/divisions/water-resources/edmr.
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 following address:
NC DEQ/Division of Water Resources/ Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
See"How to Request a Waiver from Electronic Reporting" section below.
Regardless of the submission method, the first DMR is due on the last day of the month following the
issuance of the permit or in the case of a new facility, on the last day of the month following the
commencement of discharge.
Starting on December 21,2020, the permittee must electronically report the following compliance
monitoring data and reports, when applicable:
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports; and
• Clean Water Act (CWA) Section 316(b) Annual Reports.
Page 6 of 8

Permit NC0081957
The permittee may seek an electronic reporting waiver from the Division(see"How to Request a
Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9),the permittee must identify the initial recipient at the time of
each electronic submission. The permittee should use the EPA's website resources to identify the
initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity
(EPA or the state authorized by EPA to implement the NPDES program)that is the designated entity
for receiving electronic NPDES data [see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for each
type of electronic submission and for each state. Instructions on how to access and use the
appropriate electronic reporting tool will be available as well. Information on EPA's NPDES
Electronic Reporting Rule is found at: https://www.federalregister.gov/documents/2015/10/22/2015-
24954/national-pollutant-discharge-elimination-system-npdes-electronic-reporting-rule
Electronic submissions must start by the dates listed in the"Reporting Requirements" section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an
electronic reporting waiver, a permittee must first submit an electronic reporting waiver request to the
Division. Requests for temporary electronic reporting waivers must be submitted in writing to the
Division for written approval at least sixty(60)days prior to the date the facility would be required
under this permit to begin submitting monitoring data and reports. The duration of a temporary
waiver shall not exceed 5 years and shall thereupon expire. At such time, monitoring data and reports
shall be submitted electronically to the Division unless the permittee re-applies for and is granted a
new temporary electronic reporting waiver by the Division. Approved electronic reporting waivers
are not transferrable. Only permittees with an approved reporting waiver request may submit
monitoring data and reports on paper to the Division for the period that the approved reporting waiver
request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on
the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
4. Sisnatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B.
(11.) (d)i
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II,
Section B. (11.)(a)or by a duly authorized representative of that person as described in Part II,
Section B. (11.)(b). A person, and not a position, must be delegated signatory authority for eDMR
reporting purposes.
For eDMR submissions,the person signing and submitting the DMR must obtain an eDMR user
account and login credentials to access the eDMR system. For more information on North Carolina's
eDMR system, registering for eDMR and obtaining an eDMR user account, please visit the following
web page:
Page 7 of 8

Permit NC0081957
http://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make
the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION
WILL BE ACCEPTED:
"I certify, under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the information,
the information submitted is, to the best of my knowledge and belief true, accurate, and complete. I
am aware that there are significant penalties for submitting false information, including the
possibility of fines and imprisonment for knowing violations."
5. Records Retention [Supplements Section D. (6.)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].
Page 8 of 8

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NC0081957 — Narrows Powerhouse Facility
Latitude: 35°25'09" Sub-Basin: 03-07-08 Location
Longitude: 80°05'32"
Quad#: F17NE
,Stream Class: WS-IV&B Stanly County
Receiving Stream: Yadkin River North
Map not to scale