NC0081931_Permit (Issuance)_20140214

NPDES DOCUHENT SCANNIN. COVER SHEET
NPDES Permit:
NC0081931
High Rock Powerhouse
Document Type: (Permit
:j
Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Inspection
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
February 14, 2014
Whilst document is printed on reuse paper - ignore ataxy -
content on the resterse side

AVA -
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Resources
Water Quality Programs
Pat McCrory Thomas A. Reeder John E. Skvarla, ill
Governor • Director Secretary
February 14, 2014
Mr. Mark J. Gross
Vice President, Hydro Operations, APGI
Alcoa Power Generating, Inc.
P.O. Box 576
Badin, North Carolina 28009
Subject: Issuance of NPDES Permit
Permit NC0081931
High Rock Powerhouse
Rowan County
Facility Class I
Dear Mr. Gross:
Division personnel have reviewed and approved your application for a renewal of the subject
permit. Accordingly, we are forwarding the attached NPDES discharge permit. 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).
The following changes have been incorporated into this renewal:
• Proposed federal regulations require electronic submittal of all discharge monitoring reports (DMRs)
and specify that, if a state does not establish a system to receive such submittals, then permittees must
submit DMRs electronically to the Environmental Protection Agency (EPA). The Division anticipates
that these regulations will be adopted and is beginning implementation.
The requirement to begin reporting discharge monitoring data electronically using the NC DWR's
Electronic Discharge Monitoring Report (eDMR) internet application has been added to -your
NPDES permit. [See Special Condition A. (5)] For information on eDMR, registering for eDMR
and obtaining an eDMR user account, please visit the following web page:
http: / /portal.ncdenr.org/web/wq/admin/bog/ipu/edmr.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone]
Internet: www.ncwatemualityorq
One Caro11 a
Natili44/0..
An Equal 0pportuntty 1 AffrmaUve Action Employer

For information on EPA's proposed NPDES Electronic Reporting Rule, please visit the following
web site:
http: / /www2.epa.gov/compliance/proposed-npdes-electronic-reporting-rule.
If any parts, measurement frequencies or sampling requirements contained. in this permit 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.
Please note that 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 the Division of Water Resources or permits
required by the Division of Land Resources, the Coastal Area Management Act or any other Federal or
Local governmental permit that may be required. If you have any questions concerning this permit, please
contact Sergei Chernikov at telephone number [phone].
Sincerely,
/C—
omas A. Reeder
l
cc: Central Files
NPDES Files
Mooresville Regional Office / Water Quality

Permit NC0081931
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINNATION SYSI
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,
Alcoa Power Generating, Inc.
is hereby authorized to discharge wastewater from a facility located at the
High Rock Powerhouse
3344 Mingle Ferry Road
Denton
Rowan 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 perrnit shall become effective March 1, 2014.
This permit and authorization to discharge shall expire at midnight on January 31, 2019
Signed this day February 14, 2014.
ttr Thomas A. Reeder, Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 6

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.
Alcoa Power Generating, Inc. is hereby authorized to:
1. Continue to discharge once -through cooling water from outfalls 001, 002 and 003 located at High
Rock Powerhouse, 3344 Mingle Ferry Road, Denton in Rowan 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-1V & B CA waters in the Yadkin River Basin.
Page 2 of 6

Permit NC0081931
Part I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[001 / 002 / 003]
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 monitored3 by the Permittee as specified below:
PARAMETER
DISCHARGE
LIMITATION
Monitoring Requirements
Monthly
Average
Daily
Maximum
Effluent Measurement
Frequency
Sample
Type
Sample
Location*
Flow (MGD)
Annual
Estimate
Effluent
Temperature)
Annual
Grab
Effluent
p l I2
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. No later than 270 days from the effective date of this permit, begin submitting discharge monitoring
reports electronically using NC DWR's eDMR application 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 6

Permit NC0081931
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [004]
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
Measw_ement
Frequency
Sample
Type
Sample
Location
BMP'
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
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
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.
• Logs of time, date, and volume of stormwater discharge per discharge event shall be maintained.
Page 4 of 6

Permit NC0081931
• All stormwater discharge events shall be reported along with the annual Discharge Monitoring Report
(DMR)
A. (5.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
Proposed federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and
specify that, if a state does not establish a system to receive such submittals, then pernaittees must submit
DMRs electronically to the Environmental Protection Agency (EPA). The Division anticipates that these
regulations will be adopted and is beginning implementation in late 2013.
NOTE: This special condition supplements or supersedes_ the following sections within Part II of this
permit (Standard Conditions for 1VPDES Permits):
• Section B. (11.)
• Section D. (2)
• Section D. (6)
• Section E. (5)
Signatory Requirements
Reporting
Records Retention
Monitoring Reports
1. Reporting [Supersedes Section D: (2.) and Section E. (5.) (a)1
Beginning no later than 270 days from the effective date of this permit, the permittee shall begin
reporting discharge monitoring data electronically using the NC DWR's Electronic Discharge
Monitoring Report (eDMR) internet application.
Monitoring results obtained during the previous months) shall be sum 1 ri7ed for each month and
submitted electronically using eDMR. The eDMR system allows permitted facilities to enter monitoring
data and subtnit 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 / DWR / Information Processing Unit
A'l`U NTION: Central Files / eDMR
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.
Requests for temporary waivers from the NPDES electronic reporting requirements 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 using eDMR. Temporary waivers shall be valid for twelve (12)
months and shall thereupon expire. At such time, DMRs shall be submitted electronically to the
Division unless the permittee re -applies for and is granted a new temporary waiver by the Division.
Page 5 of 6

Permit NC0081931
Information on eDMR. and application for a temporary waiver from the NPDES electronic reporting
requirements is found on the following web page:
http: / /portal.ncdenr.org/web /wq/admin/bog/ipu/eclmr
Regardless of the submission method, the first DMR is due on the last day of the year 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.
2. 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: / /portal.ncdenr.org/web/wq/admin/bog/ipu/edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make the
following certification [49 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL
BE ACCEPTED:
"1 certify, under penally of law, that this document and all attachments were prepared tinder my direction or supervision in
accordance with a system designed to assure that quaked 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 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 signfcantpenalties for submitting false information, including the possibiliy of fines and imprisonment for
knowing violations "
3. 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 6 of 6

Facility Information
Latitude:
Longitude:
Quad
Stream Class:
Receiving Stream:
Permitted Flow:
35°36'03"
80°14'03"
El8SW
WS-11,1 and B CA
Yadkin River
N/A
Sub -Basin:
03-07-08
Yadkin Inc.
NC0081931
High Rock Powerhouse

Chernikov, Sergei
From: Chernikov, Sergei
Sent: Tuesday, January 14, 2014 8:03 AM
To: 'Van Der Meyden, Henk'
Subject: RE: RE: RE: APGI Yadkin NPDES Permit Renewal
Henk,
Most of the comments are simple corrections. The two major comments are about temperature and electronic
reporting. The paper DMR are still required until the electronic signature issue is resolved. We are planning to keep the
temperature requirement as well to make sure that the instream standard is protected.
Thank you!
Sergei
Sergei Chernikov Ph.D.
Environmental Engineer II
Complex NPDES Permitting Unit
Tel. [phone]
Fax [phone]
Mailing Address: 1617 Mail Service Center, Raleigh, NC 27699
Physical Address/Express Mail: 512 N. Salisbury St., Raleigh, NC 27699-1617
From: Van Der Meyden, Henk [mailto:[e-mail]]
Sent: Tuesday, January 14, 2014 7:36 AM
To: Chernikov, Sergei
Subject: RE: RE: RE: APGI Yadkin NPDES Permit Renewal
Sergei,
Thanks for the update. Any feel for how you plan to address our comments?
Henk
From: Chernikov, Sergei [mailto:[e-mail]]
Sent: Monday, January 13, 2014 12:56 PM
To: Van Der Meyden, Henk
Cc: Gross, Mark
Subject: EXT: RE: RE: APGI Yadkin NPDES Permit Renewal
Henk,
We have not received any other comments except yours. There is a mandatory 45 days period between the
public notice and the permit issuance. We should be able to issue your permits by the end of the month.
Thank you!
Sergei
Sergei Chernikov Ph.D.
1

MEMORANDUM
To:
From:
Subject:
December 3, 2013
Britt Setzer, Regional Engineer
NC DENR / DWR / Public Water Supply Section
Mooresville Regional Office
Sergei Chernikov, Environmental Engineer II, Complex NPDES Unit,
Division of Water Resources (fax-919-807-6495)
Review of the discharge locations for the following Draft NPDES permits:
NC0081931 High Rock Powerhouse
NC0081949 Tuckertown Powerhouse
NC0081957 Narrows Powerhouse
NC0076775 Falls Powerhouse
Stanly County and Rowan County
Please indicate below by January 3, 2013 your agency's position or viewpoint on the facility
listed above. We cannot issue the permit without your concurrence. Please return this form
at your earliest convenience.
RESPONSE:
cc: file
This agency has reviewed the draft permit and determined that the proposed
discharge will not be sufficiently close to any existing or known proposed
public water supply int2ke so as to create an adverse effect on water quality.
We concur with the issuance of this permit provided the facility is operated
and maintained properly, the stated effluent limits are met prior to discharge,
and the discharge does not contravene the designated water quality standards.
Concurs with issuance of the above permit, provided the following conditions
are met:
Opposes the issuance of the above permit, based on reasons stated below, or
attached:
Date: l y2/ Zola

Salisbury Post
Ad Authorization
Salesperson: Shari Moore
Customer Name NCDENR/DWQ
Account Number 273870
WREN THEDFORD NCDENR - Division of Water Resource
1617 Mail Service Center
Raleigh NC 27699
Contact
Phone
Email [e-mail]
Agency
Payments: Date Method Card
Type
No. 1074881
Public Notice
North Carolina Environmental Management Commission/NPDES Unit
1617 Mali Service Center
Raleigh, NC 27699-1617
Notice of Intent to Issue a NPDES Wastewater Permit
The North Carolina Environmental Management Commission proposes to
Issue a NPDES wastewater discharge permit to the person(s) listed below.
Written comments regarding the proposed permit will be accepted until 30 days
after the publish date of this notice. The Director of the NC Division of Water
Resources (DWR) may hold a public hearing should there be a significant
degree of public interest. Please mail comments and/or information requests to
DWR at the above address. Interested persons may visit the DWR at 512 N.
Salisbury Street, Raleigh, NC to review Information on file. Additional informa-
tion on NPDES permits and this notice may be found on our website: http://por-
tal.ncdenr.org/web/wq/swp/ps/npdes/calendar, or by calling [phone].
The Alcoa Raver Generating, Inc requested renewal of permit NC0081931 for
High Rock Powerhouse in Rowan County; this facility discharge is once -
through cooling water and stormwater to Yadkin River, Yadkin River Basin.
Name
on Card
Printed at 11/22/13 02:25 PM by Moore
Ad# 1074881 Status: Sort OK
Account 273870
Start 11/24/2013 Stop 11/24/2013
Number of Insertions 2
Lines 57.0
Class 20510 Legal Notices
Rate 4019 Cost $73.65
Entered by SMOORE on 11/22/13
Last changed SMOORE
Last 4
Digits
Expire
Date
Check
Number
Amount
Paid
Publication
Start Stop
Salisbury Post 11/24/13 11/24/13
Salisbury Post Web 11/24/13 11/24/13
Inserts
11/24/13 SunSP
11/24/13 SunSPW
AUTHORIZATION
Under this agreement rates are subject to change with 30 days notice. In the
event of a cancellation before schedule completion, I understand that the
rate charged will be based upon the rate for the number of insertions used.
To our customers: Please check your advertisement the first day It appears
in the newspaper and/or online. After the first insertion, the Salisbury Post
will not be responsible for further errors. Advertisers should call the
Classified Department at 704-797-4220 as soon as seeing an error.
Adjustments to charges are made according to any value lost from the
incorrect ad.
Name (print or type)
Name (signature)
Salisbury Post • [phone] • www.salisburypost.com

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0081931
Facility Information
Applicant/Facility Name:
Alcoa Power Generating, Inc. /High Rock Powerhouse
Applicant Address:
PO Box 576, Badin, NC 28009-0576
Facility Address:
Northwest of the intersection for NCSR 1002 and NCSR 2501
Permitted Flow
N/A — Daily Average — 51,840 gpd
Type of Waste:
Once -through cooling water.
Facility/Permit Status:
Renewal
County:
Rowan
Miscellaneous
Receiving Stream:
Yadkin River
Regional Office:
Mooresville
Stream Classification:
303(d) Listed?:
Subbasin:
WS-IV & B CA
NO
03-07-08
USGS Topo Quad:
Permit Writer:
Date:
E 18 SW
Sergei Chernikov, Ph.D.
November 15, 2013
Drainage Area (ini2):
Summer 7Q10 (cfs)
Winter 7Q10 (cfs):
Average Flow (cfs):
IWC (%):
Primary SIC Code:
4911
Agagg,
SUMMARY
This facility maintains 4 outfalls (001, 002, 003 and 004). The source of wastewater for the outfalls
001, 002, and 003 is once through cooling water. The permit was recently modified to include
Outfall 004 for periodic discharges of stormwater from secondary containment around the
transformers. In order to prevent contamination of the receiving stream, the facility is required to
use Best Management Practices. Discharge Monitoring Reports have to be submitted annually.
The receiving stream (Yadkin River) is classified as WS-IV and B CA waters from a point 0.6 mile
upstream of High Rock Lake dam to Badin Dam. This reach is not listed on the 303(d) list as
impaired water.
COMPLIANCE SUMMARY:
The facility has an excellent compliance history. During the last 5 years, facility did not violate the
any permit limits (please see attached).
PERMIT LIMITS
• pH limits in the permit are based on the North Carolina water quality standards [15A NCAC 2B
.0200].
• Temperature limits in the permit are based on the North Carolina water quality standards [15A
NCAC 2B .0200].
PROPOSED CHANGES
• Proposed federal regulations require electronic submittal of all discharge monitoring reports (DMRs)
and specify that, if a state does not establish a system to receive such submittals, then permittees
must submit DMRs electronically to the Environmental Protection Agency (EPA). The Division
anticipates that these regulations will be adopted and is beginning implementation.
Alcoa Power Generating, Inc. — High Rock Hydroelectric Powerhouse Fact Sheet
NPDES Renewal
Page 1

The requirement to begin reporting discharge monitoring data electronically using the NC DWR's
Electronic Discharge Monitoring Report (eDMR) internet application has been added to the permit.
[See Special Condition A. (S.)]
PROPOSED SCI-IEDULE FOR PERMIT ISSUANCE:,
Draft Permit to Public Notice: December 3, 2013
Permit Scheduled to Issue: January 27, 2014
STATE CONTACT:
If you have any questions on any of the above information or on the attached permit, please contact Sergei
Chernikov at [phone] or [e-mail].
Regional Office Comments
Name: Date:
Alcoa Power Generating, Inc. — High Rock Hydroelectric Powerhouse Fact Sheet
NPDES Renewal
Page 2

To: NPDES Unit
Water Quality Section
Attention: Charles Weaver
Date: August 16, 2013
SOC Priority Project: No
NPDES STAFF REPORT AND RECOMMENDATION
County: Rowan
Permit No. NC0081931
PART I - GENERAL INFORMATION
1. Facility and address: High Rock Powerhouse
Alcoa Power Generating, Inc.
P.O. Box 576
Badin, NC 28009
Physical Address
3344 Bringle Ferry Rd.
Denton, NC 27239
2. Date of investigation: July 18, 2013
3. Report prepared by: Wes Bell, Environmental Specialist
4. Persons contacted and telephone number: Jeff Henley, [phone]
5. Directions to site: The High Rock Powerhouse is accessed via asphalt driveway on the left
(north) side of SR 1002, immediately after crossing the Yadkin River from Rowan County into
Davidson County.
6. Discharge point(s), list for all discharge points:
Latitude: 35° 36' 03"
Longitude: 80° 14' 03"
Attach a USGS map extract and indicate treatment facility site and discharge point on map.
U.S.G.S. Quad No.: E 18 SW
7. Site size and expansion area consistent with application? There is little, if any, areas available
for the construction of wastewater treatment facilities.
8. Topography (relationship to flood plain included): The Powerhouse spans the main segment of
the Yadkin River; however, the hydroelectric generation facilities are not subject to flooding.
9. Location of nearest dwelling: The nearest dwelling is approximately 1000 feet from the site.

Page Two
10. Receiving stream or affected surface waters: Yadkin River.
a. Classification: WS-IV and B, CA
b. River Basin and Subbasin No.: Yadkin 03-07-08
c. Describe receiving stream features and pertinent downstream uses: The Yadkin River is
used for primary and secondary recreation and electricity generation. The Town Denton
has a water intake within 1200 feet down gradient of the dam.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater: 0.05184 MGD*
*Intermittent depending on powerhouse usage and electrical needs.
b. Current permitted capacity: N/A
c. Actual treatment capacity: N/A
d. Date(s) and construction activities allowed by previous Authorizations to Construct
issued in the previous two years: There have been no ATCs issued in the past two years.
e. Please provide a description of existing or substantially constructed treatment facilities:
There are no existing treatment works nor are any proposed. All domestic wastewater is
treated by an on -site subsurface system
f. Possible toxic impacts to surface waters: There are no biocides added to the cooling
water at this facility.
g.
Pretreatment Program (POTWs only): N/A
2. Residuals handling and utilization/disposal scheme: There are no residuals generated.
3. Treatment plant classification: N/A
4. SIC Code(s): 4911 Wastewater Code(s) 48 Main Treatment Unit Code: N/A

Page Three
PART III OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant Funds or are any public monies
involved (municipals only)? Construction Grant funds were not used in the construction of this
facility.
2. Special monitoring or limitations (including toxicity) requests: N/A
3. Important SOC, JOC or Compliance Schedule dates (Please indicate): This facility is neither
under an SOC nor is one being considered at this time.
PART IV - EVALUATION AND RECOMMENDATIONS
The facility continues to discharge once -through (thrust bearing) cooling water through Outfalls
001 — 003 and stormwater only through Outfall 004. There have been no changes and/or modifications
to this facility or the subject permit since the permit was last issued.
It is recommended that the permit be renewed as requested.
4/) 5//
Signature of report preparer Date
Water Quality Regional Supervisor Date

ALCOA
Alcoa Inc.
APGI - Yadkin
Highway 740
PO Box 576
Badin, NC 28009
July 12, 2013 Certified Mail
Return Receipt Requested
N. C. Department of Environment and Natural Resources
Division of Water Quality
NPDES Unit
1617 Mall Service Center
Raleigh, North Carolina 27699-1617
Attn.: Mr. Charles H. Weaver
Re.: NPDES Permit Renewal Applications - Alcoa Power Generating, Inc
—High Rock Powerhouse NC0081931
Tuckertown Powerhouse NC0081949
Narrows Powerhouse NC0081957
Falls Powerhouse NC0076775
Dear Mr. Weaver:
With this letter and the attached renewal application package, Alcoa Power Generating, Inc.
(APGI) is requesting renewal of the NPDES discharge permits for the four hydroelectric
powerhouses identified above that are owned and operated by APGI The existing NPDES
discharge permits for these facilities are due to expire on January 31, 2014.
The renewal application package for each powerhouse contains the following items:
• Cover Letter - one signed original and two copies
• Completed NC Short Form C — one signed original and two copies
• Schematic of Water Flow — three copies
• Location Map — three copies
As per the instructions on the renewal application checklist, APGI is not aware of changes at any
of the four powerhouses that may have altered the nature or volume of the currently permitted
discharges. The wastewater treatment operations are limited to an oily water sump and rope
skimmer at the Tuckertown, Narrows and Falls Powerhouses. An oily water / used oil waste
stream is generated from the rope skimmers and the annual cleaning of the sumps. This waste
stream is managed off -site for energy recovery by a third party.

2
If you have questions or comments regarding this NPDES Permit Renewal Application Package,
please contact Henk van der Meyden at [phone] or via e-mail at
[e-mail].
Vice -President, Hydro Operations
cc. Henk van der Meyden — w/attachments
renewal application transmittal letter to ncdenr dwq.docx

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
1. Contact Information:
Owner Name
Facility Name
Mailing Address
City
State / Zip Code
Telephone Number
Fax Number
e-mail Address
Mail the complete application to:
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
NPDES Permit Number
NC0081931
Please print or type.
Alcoa Power Generating, Inc
High Rock Powerhouse
P.O. Box 576
Badin
N.C. / 28009
704-422-5774
704-422-5776
[e-mail]
2. Location of facility producing discharge:
Check here if same as above ❑
Street Address or State Road 3344 Bringle Ferry Road
City Denton
State / Zip Code N.C. / 27237
9
County Rowan
3. Operator Information:
Name of the firm, consultant or other entity that operates the facility. (Note that this is not referring to
the Operator in Responsible Charge or ORC)
Name
Mailing Address
City
State / Zip Code
Telephone Number
Fax Number
Alcoa Power Generating, Inc
P.O. Box 576
Badin
N.C. / 28009
704-422-5774
704-422-5776
Page 1 of 5 C-MI 10/08

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
4. Ownership Status:
Federal 0
State ❑
Private ® Public 0
5. Standard Industrial Classification (SIC) code(s): 4911
6. Number of employees: 4
7. Describe the treatment system List all installed waste treatment components with capacities,
describe the processes that generate wastewaters. If the space provided is not sufficient attach a
separate sheet of paper with the system description.
See Attached Flow Diagram
8. Is facility covered under federal effluent limitation guidelines? No ® Yes
If yes, specify the category?
9. Principal product(s) produced: Electricity
Principal raw material(s) consumed: N/A
Briefly describe the manufacturing process(es):
Hydroelectric Generation
El
Page 2 of 5 C-MI 10/08

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
10. Amount of principal product produced or raw material consumed
ist specific amounts consumed and/or units of production oue
Product Produced or Raw Material
Consumed
(AVERAGE)
Product Produced or Raw Material
Consumed
(PEAK)
per Day
289 MWhr
852 MWhr
per Month
8,789 MWhr
25,915 MWhr
per Year
105,470 MWhr
310,980 MWhr
11. Frequency of discharge: Continuous ® Intermittent ❑
If intermittent:
Days per week discharge occurs: Duration:
12. Types of wastewater discharged to surface waters only
Discharge
Flow
(GALLONS PER DAY)
Sanitary - monthly average
N/A
Utility water, etc. - monthly average
N/A
Process water - monthly average
N/A
Stormwater - monthly average
Varies
(Accumulated stormwater from transformer containment sump)
Other - monthly average
Explain: Cooling Water
51,840
Monthly Average
total discharge (all types)
51,840
13. Number of separate discharge points: 4
Outfall Identification number(s) 001, 002, 003, 004
14. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
Yadkin River latitude: 35° 36' 02.81"N; longitude: 80° 14' 02.09"W
Page 3 of 5
C-MI 10/08

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
15. Effluent Data [for new or proposed discharges]
Provide data for the parameters listed. Temperature and pH shall be grab samples, for all other parameters 24-hour
composite sampling shall be used. If more than one analysis is reported, report daily maximum and monthly
average. If only one analysis is reported, report as daily maximum..
NOTE: Permittees requesting renewal should complete the table ONLY for the parameters
currently monitored. Summarize the past 3 years of effluent data.
Parameter
Daily
Maximum
Monthly
Average
Units of
Measurement
Biochemical Oxygen Demand (BOD5)
N/A
N/A
N/A
Chemical Oxygen Demand (COD)
N/A
N/A
N/A
Total Organic Carbon
N/A
N/A
N/A
Total Suspended Solids
N/A
N/A
N/A
Ammonia as N
N/A
N/A
N/A
Temperature (Summer)
N/A
N/A
N/A
Temperature (Winter)
30.9
21.0
Celsius
pH
8.0
*
Units
Fecal Coliform (If sanitary waste is
present)
N/A
N/A
N/A
Total Residual Chlorine (if chlorine is
used)
N/A
N/A
N/A
onthly average values are not reported for pH since an arithmetic mean is not valid.
16. List all permits, construction approvals and/or applications (check all that apply and provide permit
numbers or check none if not applicable):
Type
Permit Number Type
Permit Number
Hazardous Waste (RCRA) N/A NESHAPS (CAA) N/A
UIC (SDWA) N/A Ocean Dumping (MPRSA) N/A
NPDES NC0081931 Dredge or fill (Section 404 or CWA) N/A
PSD (CAA) N/A Other N/A
Non -attainment program (CAA) N/A
17. List any chemicals that may be discharged (Please list and explain source and potential amounts.)
Page 4 of 5 C-MI 10/08

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
18. Is this facility located on Indian country? (check one)
Yes ❑ No
19. Applicant 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, complete, and accurate.
Mark J. Gross
Vice President, Hydro Operations, APGI
Printed name of Person Signing Title
`r -r-7r I
.3
Si : ature • f Ap ' licant " Date
North Carolin = General Statute 143-215.6 (b)(2) provides that: Any person who knowingly makes any false
statement representation, or certification in any application, record, report, plan, or other document files or
required to be maintained under Article 21 or regulations of the Environmental Management Commission
implementing that Article, or who falsifies, tampers with, or knowingly renders inaccurate any recording or
monitoring device or method required to be operated or maintained under Article 21 or regulations of the
Environmental Management Commission implementing that Article, shall be guilty of a misdemeanor
punishable by a fine not to exceed $25,000, or by imprisonment not to exceed six months, or by both. (18
U.S.C. Section 1001 provides a punishment by a fine of not more than $25,000 or imprisonment not more than
5 years, or both, for a similar offense.)
Page 5 of 5 C-MI 10/08

HIGH ROCK POWERHOUSE
NPDES PERMIT NO. NC0081931
v
Yadkin River
HIGH ROCK
Unit One
Scroll Case
1
Unit One
Thrust Bearing
Cooling Water
17,280 Gal/Day
Outfall # 001
Into Yadkin
River
HIGH ROCK
Unit Two
Scroll Case
Unit Two
Thrust Bearing
Cooling Water
17,280 Gal/Day
i
Outfall # 002
Into Yadkin
River
w
HIGH ROCK
Unit Three
Scroll Case
y
Unit Three
Thrust Bearing
Cooling Water
17,280 Gal/Day
Outfall # 003
Into Yadkin
River
Unit One Generator Unit Two Generator Unit Three Generator
Discharge/24 Hrs. Discharge/24 Hrs. Discharge/24 Hrs.
1,861,263,360 Gals. 1,825,718,400 Gals. 1,851,569,280 Gals.
Precipitation
HIGH ROCK
Transformer
Containment Sump
y
Outfall # 004
Into Yadkin
River
(Stormwater)
Discharge Varies

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MAP TAKEN FROM USGS 7.5•MINUTE
QUADRANGLE HIGH ROCK, NC
t V . r` frj ~�.
GEL Engineering OF NC, Inc.
an Affiliate of THEGEL GROUP, Inc.
GEL
Post Office Box 14262
Research Triangle Park. NC 27709
[phone]
PROJECT: etmx01113
High Rock Powerhouse
Rowan County, North Carolina
SITE LOCATION
MAP
FIGURE
1
DATE: May 20, 2013
DRAWN BY: KOM IAPPRV. BY: ADE