NC0081931_Owner (Name Change)_20170222

NPDES DOCUMENT :;CANNING COVER SHEET
NPDES Permit:
NC0081931
High Rock Powerhouse
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Owner Name Change
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Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
February 22, 2017
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ROY COOPER
Water Resources
ENVIRONMENTAL QUALITY
Gove,no,
MICHAEL S. REGAN
Sec elan
S. JAY ZIMMERMAN
Diredar
February 22, 2017
Mr. Eli Hopson
Cube Yadkin Generation LLC
c/o Cube Hydro Partners, LLC
2 Bethesda Metro Center, Suite 1330
Bethesda, MD 20814
Subject: Minor modification of NPDES Permit NC0081931
High Rock Powerhouse
Davidson County
Dear Mr. Hopson:
The Division has received and approved your request to transfer ownership of the subject permit.
As a result, the Division hereby reissues NC0081931. This permit is issued pursuant to the requirements of
North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North Carolina and
the U.S. Environmental Protection Agency dated October 15, 2007 (or as subsequently amended). Insert the
attached page into your permit and discard the old page.
This modified permit includes the following changes from your current permit:
> Change of ownership from Alcoa Power Generating, Inc. to Yadkin Cube Generation, LLC.
> Section A.(5) has been updated to require electronic submission of effluent data. Federal
regulations require electronic submittal of all discharge monitoring reports (DMRs).
If any parts, measurement frequencies or sampling requirements contained in this modification are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty (30)
days following receipt of this letter. This request must be in the form of a written petition, conforming to
Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings
(6714 Mail Service Center, Raleigh, North Carolina 27699-6714). Unless such demand is made, this
decision shall be final and binding.
This permit is not transferable except after notice to the Division. The Division may require
modification or revocation and reissuance of the permit. This permit does not affect the legal requirements
to obtain other permits which may be required by any other Federal, State, or Local governmental
regulation. If you have any questions concerning this matter, please contact Brianna Young at (919) 807-
6388 or via e-mail [[e-mail]].
ly,
2ti
S. Jay Zimmerman, Dire
Division of Water Resources
cc: Central Files
Mooresville Regional Office
NPDES File
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center J Raleigh, NC 27699-1617
919 807 6300 919-807-6389 FAX
hops://deq.nc.gov/about/di vi sions/water-resources/water-resources-permits/wastewater-branch/npdes-wastewater-permits

Permit NC0081931
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 143-215.1, 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
High Rock Powerhouse
3344 Bringle Ferry Road
Denton
Davidson County
to receiving waters designated as the 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 February 1, 2017.
This permit and authorization to discharge shall expire at midnight on January 31, 2019.
Signed this day February 22, 2017.
S Zimmerman, P.G.
erector, Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 7

Permit NC0081931
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 water from outfalls 001, 002 and 003 located at High
Rock Powerhouse, 3344 Bringle Ferry Road, Denton in Davidson County,
2. Stormwater Discharge System — The facility is permitted to periodically discharge stormwater from
secondary containment for transformers through a stormwater conveyance system, via outfall 004.
3. Discharge from said treatment works at the location specified on the attached map into Yadkin River,
currently classified as WS-IV & B in the Yadkin River Basin.
Page 2 of 7

Permit NC0081931
Part I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[001 / 002 / 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 once -through cooling water from outfalls 001, 002 and 003. Such discharges
shall be limited and monitored' by the Permittee as specified below:
PARAMETER
DISCHARGE LIMITATIONS
Monitoring Requirements
Monthly
Average
Daily
Maximum
Effluent Measurement
Frequency
Sample
Type
Sample
Location*
Flow (MGD) 00500
Annual
Estimate
Effluent
Temperature1 00010
Annual
Grab
Effluent
pH2 00400
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. (5.).
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 3 of 7

Permit NC0081931
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [004]
[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 stormwater from outfall 004. Such discharges shall be limited and monitored by the
Permittee as specified below:
PARAMETER
DISCHARGE LIMITATIONS
Monitoring Requirements
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location
BMP1
NOTES:
1. SEE A. (4).
There shall be no discharge of floating solids or visible foam (other than trace amounts) in the effluent,
unless ambient river conditions prevent compliance.
A. (3.) 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 DENR / DWR / Aquatic Toxicology Unit
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
A. (4.) BEST MANAGEMENT PRACTICES (BMP) FOR PERIODIC STORMWATER
DISCHARGE
[NCGS 143-215.66]
The permittee is authorized by the Division to use Best Management Practices for the stormwater discharge
from the secondary containment around the transformers under the following conditions:
• Sumps shall be designed with underflow weirs/devices to prevent discharge of oily stormwater.
• Weekly inspections of the transformers shall be performed to detect leaks/drips of oil.
• Routine preventive maintenance procedures shall be conducted to address any leaks/drips of oil.
• Inspection of the sump for the presence of oil as indicated by a visible sheen shall be conducted prior
to the discharge.
Page4 of7

Permit NC0081931
• Logs of time, date, and volume of stormwater discharge per discharge event shall be maintained.
• All stormwater discharge events shall be reported along with the annual Discharge Monitoring Report
(DMR).
A. (5.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[NCGS 143-215.1 (b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program reports. The
final NPDES Electronic Reporting Rule was adopted and became effective on December 21, 2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this permit
(Standard Conditions forNPDES Permits):
• Section B. (11.)
• Section D. (2)
• Section D. (6.)
• Section E. (5.)
Signatory Requirements
Reporting
Records Retention
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 printing, signing, and submitting one signed original and a copy of the computer printed eDMR to
the following address:
NC DENR / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility being
physically located in an area where less than 10 percent of the households have broadband access, then a
temporary waiver from the NPDES electronic reporting requirements may be granted and discharge monitoring
data may be submitted on paper DMR forms (MR 1,1.1, 2, 3) or alternative forms approved by the Director.
Duplicate signed copies shall be submitted to the mailing address above. See "How to Request a Waiver from
Electronic Reporting" section below.
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
o Clean Water Act (CWA) Section 316(b) Annual Reports.
• Page 5 of 7

Permit NC0081931
The permittee may seek an electronic reporting waiver from the Division (see "How to Request a Waiver from
Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1) (9), the permittee must identify the initial recipient at the time of each
electronic submission. The permittee should use the EPA's website resources to identify the initial recipient for
the electronic submission.
Initial recipient of electronic NPDES information from NPDES-regulated facilities means the entity (EPA or the
state authorized by EPA to implement the NPDES program) that is the designated entity for receiving electronic
NPDES data [see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electronic reporting tool for each type of
electronic submission and for each state. Instructions on how to access and use the appropriate electronic
reporting tool will be available as well. Information on EPA's NPDES Electronic Reporting Rule is found at
http: / /www2.epa.gov/compliance/final-national-pollutant-discharge-elimination-system-npdes-electronic-
reporting-rule.
Electronic submissions must start by the dates listed in the "Reporting Requirements" section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an electronic
reporting waiver, a permittee must first submit an electronic reporting waiver request to the Division. Requests
for temporary electronic reporting waivers must be submitted in writing to the Division for written approval at
least sixty (60) days prior to the date the facility would be required under this permit to begin submitting
monitoring data and reports. The duration of a temporary waiver shall not exceed 5 years and shall thereupon
expire. At such time, monitoring data and reports shall be submitted electronically to the Division unless the
permittee re -applies for and is granted a new temporary electronic reporting waiver by the Division. Approved
electronic reporting waivers are not transferrable. Only permittees with an approved reporting waiver request
may submit monitoring data and reports on paper to the Division for the period that the approved reporting
waiver request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are found on the following
web page:
http://deq.nc.gov/about/divisions /water-resources/edmr
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)]
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II, Section B.
(11)(a) or by a duly authorized representative of that person as described in Part II, Section B. (11.)(b). A person,
and not a position, must be delegated signatory authority for eDMR reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user account and
login credentials to access the eDMR system. For more information on North Carolina's eDMR system,
registering for eDMR and obtaining an eDMR user account, please visit the following web page:
http: / /deq.nc.gov/about/divisions/water-resources /edmr
Page 6 of 7

Permit NC0081931
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 cert61, under penalty of law, that this document and all attachments were prepared under my direction or supenvirion in accordance
with a system designed to assure that qualified personnel properfrgather and evaluate the information submitted Based on my inquiry
of the person orpersons who manage the system, or those persons directly responsible forgathering the information, the information
submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are signjcant penalties for
submitting false information, including the possibility of fines and imprisonment for knowing violations."
5. Records Retention [Supplements Section D. (6.)].
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 7 of 7

NC0081931 - High Rock Powerhouse
Latitude: 35°36'03" Sub -Basin: 03-07-08
Longitude: 80°1403"
Quad #: E18SW
Stream Class: WS-IV & B
Receiving Stream: Yadkin River
Facility
Location
Map not to scale
Davidson County