NCG500128_complete file-historical_20160119

Wafer Resources
LNVINONMLNIAL OUALIIY
January 19, 2016
Mr. Steve Cahoon
Duke Energy Carolinas, LLC
410 S Wilmington St
Raleigh, NC 27601
PAT MCCRORY
DONALD R.-VAN DER VAART
S. JAY ZIMMERMAN
Subject: Renewal of General Permit NCG500000
Mission Hydroelectric Station
Certificate of Coverage NCG500128
Clay County
Dear Permittee:
The Division has renewed the subject General Permit. We appreciate your patience during the
longer -than -expected renewal period. The Division hereby issues the updated version of Certificate of
Coverage (CoC) NCG500128 under General Permit NCG500000. It is issued pursuant to the requirements
of North Carolina General Statue 143-215.1 and the Memorandum of Agreement between North Carolina
.and the US Environmental Protection agency dated October 15, 2007 [or as subsequently amended].
If any parts, measurement frequencies or sampling requirements contained in this General Permit
are unacceptable to you, you have the right to request an individual permit by submitting an individual
permit application. Unless such demand is made, the certificate of coverage shall be final and binding.
Please take notice that this Certificate of Coverage is not transferable except after notice to the
Division. The Division may require modification or revocation and reissuance of the certificate of coverage.
Contact the Asheville Regional Office prior to any sale or transfer of the permitted facility.
Regional Office staff will assist you in documenting the transfer of this CoC
This permit does not affect the legal requirements to obtain any other State, Federal, or Local
governmental permit that may be required. If you have any questions concerning the requirements of the
General Permit, please contact Charles Weaver of the NPDES staff [919 807-6391 or
charles.we aver@ncdenr. gov].
cc: Asheville. Regional Office
NPDES file
OSSincely,
r.ay Zimmerman, Director
Division of Water Resources
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh, NC 27699-1617
919 807 6300 919-807-6389 FAX
htq).,//portal.ncdenr.org/web/wq

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
GENERAL PERMIT NCG500000
CERTIFICATE OF COVERAGE NCG500128
DISCHARGE OF NON -CONTACT COOLING WATER, COOLING TOWER AND BOILER
BLOWDOWN, CONDENSATE, EXEMPT STORMWATER, COOLING WATERS ASSOCIATED
WITH HYDROELECTRIC OPERATIONS, AND SIMILAR WASTEWATERS 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,
Duke Energy Carolinas, LLC
is hereby authorized to discharge from a facility located at the
Mission Hydroelectric Station
1765 Mission Dam Rd
Murphy
Clay County
to receiving waters designated as the Hiwassee River, a class WS-IV stream in subbasin 04-05-01
of the Hiwassee River Basin in accordance with the effluent limitations, monitoring requirements,
and other conditions set forth in Parts I, II, III and IV hereof.
This certificate of coverage takes effect January 19, 2016.
This Certificate of Coverage shall remain valid for the duration of the General Permit.
Signed this day January 19, 2016
for's y Zimmerman, Director
ivision of Water Resources
By Authority of the Environmental Management Commission

I
e� �
A,
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Resources
Pat McCrory Thomas A. Reeder John E. Skvarla, III
Governor Director Secretary
NOTICE OF RENEWAL INTENT
[Required by 15A NCAC 02H .0127(d)l; Iterm definition see 15A NCAC 02H .0103(19)1
Application for renewal of existing coverage under General Permit NCG500000
Existing Certificate of Coverage (CoQ: NCG500128
(Press Tab to navigate form)
1) Mailing address of facility owner/operator: (address to which all correspondence should be mailed)
Company Name Duke Energy Carolinas, LLC
Owner Name Steve Cahoon
Street Address 410 S Wilmington St
City Raleigh State N.C.
Telephone # 919 - 546 - 7457 Fax # 919 - 546 - 4409
Email Address [e-mail]
2) Location of facility producing discharge:
Facility Name Mission Hydroelectric Station
Facility Contact W. Marcus Pitts
Street Address 1765 Mission Dam Road
City Murphy State NC
County Clay
Telephone # 864 - 304 - 9703 Fax #
Email Address [e-mail]
3) Description of Discharge:
a) Is the discharge directly to the receiving stream?
ZIP Code 27601 -
RECEIVEDIDENUM
JAN 30 2015
Water Quality
Permitting Sector
ZIP Code 28904 -
® Yes
❑ No — Please submit a site map with the pathway to the potential receiving waters clearly marked. This
includes tracing the pathway of the storm sewer to the discharge point, if the storm sewer is the only
viable means of discharge.
b) Number of discharge outfalls (ditches, pipes, channels, etc. that convey wastewater from the property):
One
Page 1 of

NCG500000 Renewal Application
c) What type of wastewater is discharged? Indicate which discharge points, if more than one.
❑ Non -contact cooling water
❑ Boiler Blowdown
❑ Cooling Tower Blowdown
❑ Condensate
® Other
(Please describe "Other"): Sump
Outfall (s) #: —
Outfall (s) #:
Outfall (s) #: —
Outfall (s) #:
Outfall (s) #: 001
d) Volume of discharge per each discharge point (in GPD):
#001: 17,280 GPD #002: _ GPD #003: _ GPD #004: GPD
4) Please check the type of chemical[s] added to the wastewater for treatment, per each separate discharge
point (if applicable, use separate sheet):
❑ Chlorine ❑ Biocides ❑ Corrosion inhibitors ❑ Algaecide ❑ Other ® None
If any box other than None is checked, a completed Biocide 101 Form and manufacturers' information on the
additive must be submitted to the following address for approval:
NC DENR / DWR / Environmental Sciences Section
Aquatic Toxicology Unit
1621 Mail Service Center
Raleigh, NC 27699-1621
5) Is there any type of treatment being provided to the wastewater before discharge? (i.e., retention ponds,
settlingponds, etc.)
❑ Yes - Please include design specifics (i.e., design volume, retention time, surface area, etc.) with submittal
package. Existing treatment facilities should be described in detail.
® No
6) Discharge Frequency:
a) The discharge is: ® Continuous ❑ Intermittent ❑ Seasonal
i) If the discharge is intermittent, describe when the discharge will occur:
ii) If seasonal, check the month(s) the discharge occurs:
❑ Jan ❑ Feb ❑ Mar. ❑ Apr ❑ May ❑ Jun ❑ Jul ❑ Aug. ❑ Sept. ❑ Oct. ❑ Nov. ❑ Dec.
b) How many days per week is there a discharge? Seven
c) Please check the days discharge occurs: ® Sat. ® Sun. ® Mon. ® Tue. ® Wed. ® Thu. ® Fri.
Page 2 of 3

N
NCG500000 Renewal Application
Additional Application Requirements:
The following information must be included in duplicate [original + 1 copy] with this application or it
will be returned as incomplete.
➢ Site map. If the discharge is not directly to a stream, the pathway to the receiving stream must
be clearly indicated. This includes tracing the pathway of a storm sewer to its discharge point.
➢ Authorization for representatives. If this application will be submitted by a consulting
engineer (or engineering firm), include documentation from the Permittee showing that the
consultant submitting the application has been designated an Authorized Representative of the
applicant, per 15A NCAC 02H .0138(b)(1).
CERTIFICATION
I certify that I am familiar with the information contained in this application and that to the best of my
knowledge and belief such information is true, complete, and accurate.
Printed Name of Person Signing: Randy C. Herrin Title: GM III Regional Fleet
(Please review 15A NCAC 02H .0106(e) for authorized signing officials)
Click ere to enter a date.
Signature of AppK Date Signed
North Carolina General Statute § 143-215.6E provides that:
Any person who knowingly makes any false statement representation, or certification in any application, record,
report, plan, or other document filed or required to be maintained under this Article or a rule implementing this
Article; or who knowingly makes a false statement of a material fact in a rulemaking proceeding or contested case
under this Article; or who falsifies, tampers with, or knowingly renders inaccurate any recording or monitoring device
or method required to be operated or maintained under this Article or rules of the Commission implementing this
Article, shall be guilty of a Class 2 misdemeanor which may include a fine not to exceed ten thousand dollars
($10,000). 18 U.S.C. Section 1001 provides a punishment by a fine or imprisonment not more than 5 years, or both,
for a similar offense.
This Notice of Renewal Intent does NOT require a separate fee.
The permitted facility already pays an annual fee for coverage under NCG500000.
Mail the original and one copy of the entire package to:
NC DENR / DWR / Water Permitting Section
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Attn: Charles Weaver
Page 3 of 3

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As ::
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue
Governor
Mr. Allen Stowe, Jr.
Duke Energy Corporation
526 South Church Street / EC 13K
Charlotte, NC 28202
Dear Permittee:
Charles Wakild, P.E.
Director
August 3, 2012
Dee Freeman
Secretary
Subject: Renewal of coverage / General Permit NCG500000
Mission Hydroelectric Station
Certificate of Coverage NCG500128
Clay County
The Division is renewing Certificate of Coverage (CoC) NCG500128 to discharge under NPDES
General Permit NCG500000. This CoC is issued pursuant to the requirements of North Carolina General
Statue 143-215.1 and the Memorandum of Agreement between North Carolina and the US Environmental
Protection agency dated October 15, 2007 [or as subsequently amended].
If any parts, measurement frequencies or sampling requirements contained in this General Permit
are unacceptable to you, you have the right to request an individual permit by submitting an individual
permit application. Unless such demand is made, the certificate of coverage shall be final and binding.
Please take notice that this Certificate of Coverage is not transferable except after notice to the
Division. The Division may require modification or revocation and reissuance of the certificate of coverage.
Contact the Asheville Regional Office prior to any sale or transfer of the permitted facility.
Regional Office staff will assist you in documenting the transfer of this CoC.
This permit does not affect the legal requirements to obtain other permits which may be required by
the Division of Water Quality or permits required by the Division of Land Resources, Coastal Area
Management Act or any other Federal or Local governmental permit that may be required.
If you have any questions concerning the requirements of the General Permit, please contact John
Hennessy [919 807-6377 or [e-mail]].
Sincerely,
Original signed by John Hennessy
for Charles Wakild, P.E.
cc: Asheville Regional Office / Surface Water Protection
NPDES file
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
512 North Salisbury Street, Raleigh, North Carolina 27604
Phone: [phone] / FAX [phone] / Internet: www.ncwaterquality.org
An Equal Opportunity/Affirmative Action Employer -50% Recycled/l0% Post Consumer Paper
None
rthCarohna
Naturally

I
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NCG500000
CERTIFICATE OF COVERAGE NCG500128
TO DISCHARGE NON -CONTACT COOLING WATER, COOLING TOWER AND
BOILER BLOWDOWN, CONDENSATE AND SIMILAR WASTEWATERS 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,
Duke Energy Corporation
is hereby authorized to discharge Hydroelectric Dam Sumps & Non -contact Cooling Water
from a facility located at
Mission Hydroelectric Station
Mission Dam Road
Andrews
Clay County
to receiving waters designated as the Hiwassee River in subbasin 04-05-01 of the
Hiwassee River Basin in accordance with the effluent limitations, monitoring
requirements, and other conditions set forth in Parts I, II, III and IV hereof.
This Certificate of Coverage shall become effective August 3, 2012.
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this day August 3, 2012
Original signed by John Hennessy
for Charles Wakild, Director
Division of Water Quality
By Authority of the Environmental Management Commission

F15%,
Division of Water Quality / Water Quality Section
NCDENRNational Pollutant Discharge Elimination System
CAROL*" of
I'Hva'toxrtr!tT uin tom,. Rya NCG500000
FOR AGENCY USE ONLY
I Certificate of Coverage I
NOTICE OF INTENT
National Pollutant Discharge Elimination System application for coverage under General Permit
NCG500000: Non -contact cooling water, boiler blowdown, cooling tower blowdown, condensate, and
similar point source discharges
(Please print or type)
1) Mailing address of owner/operator:
Company Name Duke Energy Carolinas, LLC
Owner Name Allen Stowe - Water Management
Street Address 526 South Church Street, Interoffice - EC13K
City Charlotte
Telephone No. [phone]
* Address to which all permit correspondence will be mailed
2) Location of facility producing discharge:
Facility Name Mission Hydroelectric Station
Facility Contact
Street Address
City
County
Gary Morgan
1765 Mission Dam Road
Murphy
Clay
Telephone No. 828
3) Physical location information
369-4605
State N•C• ZIP Code 28202
Fax: [phone]
State NC ZIP Code 28904
Fax: NA
Please provide a narrative description of how to get to the facility (use street names, state road numbers,
and distance and direction from a roadway intersection). Take Hwy 74 to traffic tight in Marble. Turn Lefton Hwy 141 South Go 6.3 miles,
turn left on Upper Peach Tree Rd. Go 1 mile, turn right on Mission Rd. Go 1.5 miles, turn left on Mission Dam Rd. Go 0.4 mile, turn right on a gravel road. Plant at end of road.
(A copy of a county map or USGS quad sheet with facility clearly located on the map is required to be submitted with this application)
4) This NPDES permit application applies to which of the following:
❑ New or Proposed
❑ Modification
Please describe the modification:
B Renewal
Please specify existing permit number and original issue date:
5) Does this facility have any other NPDES permits?
B No
❑ Yes
If yes, list the permit numbers for all current NPDES permits for this facility:
6) What is the nature of the business applying for this permit? Electric Generation
Page 1 of 4 04/05

NCG500000 N.O.I.
7) Description of Discharge:
a) Is the discharge directly to the receiving water? 8 Yes ❑ No
If no, submit a site map with the pathway to the potential receiving waters clearly marked. This
includes tracing the pathway of the storm sewer to the discharge point, if the storm sewer is the only
viable means of discharge.
b) Number of discharge points (ditches, pipes, channels, etc. that convey wastewater from the
property): one
c) What type of wastewater is discharged? Indicate which discharge points, if more than one.
B Non -contact cooling water Discharge point(s) #: 001
❑ Boiler Blowdown Discharge point(s) M
❑ Cooling Tower Blowdown Discharge point(s) #:
❑ Condensate Discharge point(s) #:
❑ Other Discharge point(s) M
(Please describe "Other")
d) Volume of discharge per each discharge point (in GPD):
#1: 17,280 #2: #3: #4
e) Please describe the type of process (i.e., compressor, A/C unit, chiller, boiler, etc.) the wastewater is
being discharged from, per each separate discharge point (if applicable, use separate sheet):
Hydroelectric generator
8) Please check the type of chemical added to the wastewater for treatment, per each separate discharge
point (if applicable, use separate sheet):
❑ Biocides Name:
Manuf.:
❑ Corrosion inhibitors Name:
Manuf.:
❑ Chlorine Name:
Manuf.:
❑ Algaecide Name:
Manuf.:
❑ Other Name:
Manuf.:
B None
9) If any box in item (8) above, other than none, was checked, a completed Biocide 101 Form and
manufacturers' information on the additive is required to be submitted with the application for the
Division's review.
10) Is there any type of treatment being provided to the wastewater before discharge (i.e., retention ponds,
settling ponds, etc.)? ❑ Yes 8 No
If yes, please include design specifics (i.e., design volume, retention time, surface area, etc.) with
submittal package. Existing treatment facilities should be described in detail. Design criteria and
operational data (including calculations) should be provided to ensure that the facility can comply with the
requirements of the General Permit. The treatment shall be sufficient to meet the limits set by the
general permits.
Note: Construction of any wastewater treatment facilities requires submission of three (3) sets
of plans and specifications along with the application. Design of treatment facilities
must comply with the requirements of 15A NCAC 2H .0138. If construction applies to
this discharge, include the three sets of plans and specifications with this application.
Page 2 of 4 04/05

NCG500000 N.O.I.
11) Discharge Frequency:
a) The discharge is: B Continuous ❑ Intermittent
i) If the discharge is intermittent, describe when the discharge will occur:
b)
c)
❑ Seasonalo
ii) If seasonal check the month(s) the discharge occurs: ❑ Jan. ❑ Feb. ❑ Mar. ❑ Apr.
❑ May ❑ Jun. ❑ Jul. ❑ Aug. ❑ Sept. ❑ Oct. ❑ Nov. ❑ Dec.
How many days per week is there a discharge? Seven
Please check the days discharge occurs:
B Sat. B Sun. B Mon. 8 Tue. B Wed.
12) Pollutants:
B Thu. B Fri.
Please list any known pollutants that are present in the discharge, per each separate discharge point (if
applicable, use separate sheet):
13) Receiving waters:
a) What is the name of the body or bodies of water (creek, stream, river, lake, etc.) that the facility
wastewater discharges end up in? If the site wastewater discharges to a separate storm sewer
system (4S), name the operator of the 4S (e.g. City of Raleigh). Hiwassee River
b) Stream Classification: WA-iv,C
14) Alternatives to Direct Discharge:
Address the feasibility of implementing each of the following non -discharge alternatives
a) Connection to a Municipal or Regional Sewer Collection System Not Available
b) Subsurface disposal (including nitrification field, infiltration gallery, injection wells, etc.) Too much flow
c) Spray irrigation Not justifiable, no significant thermal gradient or pollutant load
The alternatives to discharge analysis should include boring logs and/or other information indicating that
a subsurface system is neither feasible nor practical as well as written confirmation indicating that
connection to a POTW is not an option. It should also include a present value of costs analysis as
outlined in the Division's "Guidance For the Evaluation of Wastewater Disposal Altematives".
15) Additional Application Requirements:
For new or proposed discharges, the following information must be included in triplicate with this
application or it will be returned as incomplete.
a) 7.5 minute series USGS topographic map (or a photocopied portion thereof) with discharge location
clearly indicated.
b) Site map, if the discharge is not directly to a stream, the pathway to the receiving stream must be
clearly indicated. This includes tracing the pathway of a storm sewer to its discharge point.
c) If this application is being submitted by a consulting engineer (or engineering firm), include
documentation from the applicant showing that the engineer (Or firm) submitting the application has
been designated an authorized Representative of the applicant.
d) Final plans for the treatment system (if applicable). The plans must be signed and sealed by a North
Carolina registered Professional Engineer and stamped -"Final Design -Not released for construction".
Page 3 of 4 04/05

NCG500000 N.O.I.
e) Final specifications for all major treatment components (if applicable). The specifications must be
signed and sealed by a North Carolina registered Professional Engineer and shall include a narrative
description of the treatment system to be constructed.
I certify that I am familiar with the information contained in this application and that to the best of my
knowledge and belief such information is true, complete, and accurate.
Printed Name of Person Signing: Carol S.Goolsby
Title: Vine President, Hydro Fleet
SA
(Signature of
North Carolina General Statute 143-215.6 b (1) provides that:
2G /Z" dZ
(Date Signed)
Any person who knowingly makes any false statement, representation, or certification in any
application, record, report, plan or other document filed 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.)
Notice of Intent must be accompanied by a check or money order for $100.00 made payable to:
NCDENR
Mail three (3) copies of the entire package to:
NPDES Permits Unit
Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Final Checklist
This application will be returned as incomplete unless all of the following items have been
included:
8 Check for $100 made payable to NCDENR
8 3 copies of county map or USGS quad sheet with location of facility clearly marked on map
B 3 copies of this completed application and all supporting documents
❑ 3 sets of plans and specifications signed and sealed by a North Carolina P.E.
B Thorough responses to items 1-7 on this application
8 Alternatives analysis including present value of costs for all alternatives
Note
The submission of this document does not guarantee the issuance of an NPDES permit
Page 4 of 4 04/05

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►Duke
IlEnergy® N%
CERTIFIED MAIL — RETURN RECEIPT REQUESTED
January 29, 2008
Mr. David Matthews II
North Carolina Department of Environmental
Health and Natural Resources
Division of Water Quality
Point Source Branch
1617 Mail Service Center
Raleigh, NC 27669-1617
NC6sW,a8/
BARRY E. PULSKAMP
Senior Vice President
Regulated Fleet Operations
Duke Energy Corporation
139 East Fourth Street
EM402
Cincinnati, OH 45202
513 287 3485
[e-mail]
FEB - 5 2008
i -
Y/ATF.R QUN IP'
Re: Delegation of Authority - Signatures on Reports and Requested Information
Duke Energy NPDES Permitted Stations
North Carolina Hydroelectric Facilities
Dear Mr. Matthews:
Part II of B.6.b of the NPDES permits and Federal Regulation 40 CFR 122.22 specify that all
reports required by NPDES permits and other information requested by the permit issuing authority
shall be signed by a responsible corporate officer or a manager of the facility who is authorized to
make management decisions governing the operation of the facility. I hereby authorize the
Manager or General Manager, Hydro Fleet (currently Carol S. Goolsby), and her successors, the
authority to sign all reports and requested information related to the permits or permit applications
for the North Carolina hydroelectric facilities specified below:
NCG ipord % r .rooia y r�c°c,�v �rzf ,yC.cvzcl3`7 N�,00/ao Ncr; jrcrl5
Bear Creek, �rigewater, B1)e6svrCe4acosr Itff, Cowans Ford, Lookout Shoals, Mission,
/+Sag3/ E Mountain Island, Nantahala, Oxford, Rho hiss, Tenn�pY,ssee Creek, Thorpe, Tuckasegee,
Y
Tuxedo�r b'rcrmrao/3� J, !=O*9 e4�S80/a3 N�s�°/d
4 % `L
iCSScn/r� Nc6Soo//9
If there are questions or additional information is needed, please contact Allen Stowe at
[phone].
Sincerely,
I 6�
Barry E. Pulskamp
Senior Vice President
Regulated Fleet Operations
www.duke-energy.com

L
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Michael F. Easley, Governor William G. Ross, Jr., Secretary
Coleen H. Sullins, Director
July 23, 2007
Jimmie Allen Stowe, Jr.
Duke Energy Corporation
526 South Church Street / EC 13K
Charlotte, NC 28202
Subject: Renewal of coverage / General Permit NCG500000
Mission Hydroelectric Station
Certificate of Coverage NCG500128
Clay County
Dear Permittee:
In accordance with your renewal application [received on January 31, 20071, the Division is renewing
Certificate of Coverage (CoC) NCG500128 to discharge under NCG500000. This CoC is issued pursuant to the
requirements of North Carolina General Statue 143-215.1 and the Memorandum of Agreement between North
Carolina and the US Environmental Protection agency dated May 9, 1994 [or as subsequently amended].
If any parts, measurement frequencies or sampling requirements contained in this General Permit are
unacceptable to you, you have the right to request an individual permit by submitting an individual permit
application. Unless such demand is made, the certificate of coverage shall be final and binding.
Please take notice that this Certificate of Coverage is not transferable except after notice to the
Division. The Division may require modification or revocation and reissuance of the certificate of coverage.
Contact the Asheville Regional Office prior to any sale or transfer of the permitted facility.
Redonal Office staff will assist you in documenting the transfer of this CoC.
This permit does not affect the legal requirements to obtain other permits which may be required by
the Division of Water Quality or permits required by the Division of Land Resources, Coastal Area
Management Act or any other Federal or Local governmental permit that may be required.
If you have any questions concerning the requirements of the General Permit, please contact Jim
McKay [919 733-5083, extension 595 or [e-mail].
Sincerely,
,OL� -A �
for Coleen H. Sullins
cc: Central Files
Asheville Regional Office / Surface Water Protection
NPDES file
1617 Mail Service Center, Raleigh, North Carolina 27699.1617 One
512 North Salisbury Street, Raleigh, North Carolina 27604 NorthCarolina
Phone: [phone] / FAX [phone] / Internet: www.ncwaterquality.org � a ���N� l//�
An Equal Opportunity/Affirmative Action Employer —50% Recycled/10% Post Consumer Paper f�/�/ L

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STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NCG500000
CERTIFICATE OF COVERAGE NCG500128
TO DISCHARGE NON -CONTACT COOLING WATER, COOLING TOWER AND BOILER
BLOWDOWN, CONDENSATE AND SIMILAR WASTEWATERS 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,
Duke Energy Corporation
is hereby authorized to discharge from a facility located at
Mission Hydroelectric Station
Mission Dam Road
Andrews
Clay County
to receiving waters designated as the Hiwassee River in subbasin 40501 of the Hiwassee
River Basin in accordance with the effluent limitations, monitoring requirements, and
other conditions set forth in Parts I, II, III and IV hereof.
This certificate of coverage shall become effective August 1, 2007.
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this day July 23, 2007.
/.,, -A � �.
for Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission

1,'11144 a,
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Alan W. Klimek, P.E., Director
NOTICE OF RENEWAL INTENT
Application for renewal of existing coverage under General Permit NCG500000
Existing Certificate of Coverage (CoC): NCG500128
(Please print or type)
1) Mailing address* of facility owner/operator:
Company Name Duke Energy Carolinas, LLC
Owner Name Allen Stowe, Scientist - Water Management
Street Address 526 South Church Street, EC 13K
City Charlotte StateNC ZIP Code 28202
Telephone Number(704) 382-4309 Fax: [phone]
Email address iastoweOduke-ener .com
* Address to which all permit correspondence should be mailed
2) Location of facility producing discharge:
Facility Name Mission Hydroelectric Station
Facility Contact John Reighard
Street Address Mission Dam Road
City Andrews StateNC ZIP Code 28901
County Clay
Telephone Number(828) 837-2431 Fax: NLA
Email address [e-mail]
3) Description of Discharge:
a) Is the discharge directly to the receiving stream? ® Yes p No
(If no, submit a site map with the pathway to the potential receiving waters clearly marked. This includes tracing the pathway of the
storm sewer to the discharge point, if the storm sewer is the only viable means of discharge.)
b) Number of discharge outfalls (ditches, pipes, channels, etc. that convey wastewater from the
property): One
c) What type of wastewater is discharged? Indicate which discharge points, if more than one.
® Non -contact cooling water
Outfall(s) #: 001
0 Boiler Blowdown Outfall (s) #:
Page 1 of 3

NCG500000 renewal application
❑ Cooling Tower Blowdown Outfall (s) #:
O Condensate Outfall (s) #:
O Other Outfall (s) #:
(Please describe "Other")
d) Volume of discharge per each discharge point (in GPD):
#001:17,280 #002: #003: #004
4) Please check the type of chemical [s] added to the wastewater for treatment, per each separate discharge
point (if applicable, use separate sheet):
O Chlorine O Biocides ❑ Corrosion inhibitors O Algaecide O Other
® None
5) If any box in item (4) above [other than None] was checked, a completed Biocide 101 Form and
manufacturers' information on the additive must be submitted to the following address for approval:
NC DENR / DWQ / Environmental Sciences Section
Aquatic Toxicology Unit
1621 Mail Service Center
Raleigh, NC 27699-1621
6) Is there any type of treatment being provided to the wastewater before discharge (i.e., retention ponds,
settling ponds, etc.)? O Yes ® No
(If yes, please include design specifics (i.e., design volume, retention time, surface area, etc.) with submittal package. Existing
treatment facilities should be described in detail. )
7) Discharge Frequency:
a) The discharge is: ® Continuous OIntermittent O Seasonal*
i) If the discharge is intermittent, describe when the discharge will occur:
ii) *Check the month(s) the discharge occurs: ❑ Jan ❑ Feb O Mar. O Apr O May O Jun O Jul O
Aug. O Sept. ❑ Oct. ❑ Nov. (3 Dec.
b) How many days per week is there a discharge? Seven
c) Please check the days discharge occurs: ® Sat. ® Sun. ® Mon. ® Tue. ® Wed. ® Thu. ® Fri.
8) Receiving stream[s]:
a) To what body or bodies of water (creek, stream, river, lake, etc.) does the facility discharge wastewater?
If the site discharges wastewater to a separate storm sewer system (4S), name the operator of the 4S
(e.g. City of Raleigh). Hiwassee River
b) Stream Classification: WS-IV,C
Additional Application Requirements:
Page 2of3

NCG500000 renewal application
Additional Application Requirements:
The following information must be included in triplicate [original + 2 copies] with this application or
it will be returned as incomplete.
➢ Site map. If the discharge is not directly to a stream, the pathway to the receiving stream
must be clearly indicated. This includes tracing the pathway of a storm sewer to its
discharge point.
➢ Authorization for representatives. If this application will be submitted by a consulting
engineer (or engineering firm), include documentation from the Permittee showing that the
consultant submitting the application has been designated an Authorized Representative of
the applicant.
Certification
I certify that I am familiar with the information contained in this application and that to the best of
my knowledge and belief such information is true, complete, and accurate.
Printed Name of Person Signing: Carol S. Goolsby
Title: General Manager, Hydro Fleet
(Signature of
North Carolina General Statute 143-215.6 b (1) provides that:
1 29 07
(Date Signed)
Any person who knowingly makes any false statement, representation, or certification in any application, record, report, plan or other document
filed 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.)
aEaEasaEaEasasasasasasa
This Notice of Renewal Intent does NOT require a separate fee.
The permitted facility already pays an annual fee for coverage under NCG500000.
aEaEaEaEaEaEaEo:EaEaEasa
Mail the original and two copies of the entire package to:
Mr. Charles H. Weaver
NC DENR / DWQ / NPDES
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Page 3 of 3

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State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross Jr., Secretary
Alan W. Klimek, P.E. Director
July 26, 2002
THOMAS D SMITHERMAN
MISSION HYDROELECTRIC PLANT
301 NP&L LOOP RD MAIL CODE EC 11E
FRANKLIN, NC 28734
L1.1!WA
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: Reissue - NPDES Wastewater Discharge Permit
Mission Hydroelectric Plant
COC Number NCG500128
Clay County
Dear Permittee:
In response to your renewal application for continued coverage under general permit NCG500000, the Division of
Water Quality (DWQ) is forwarding herewith the reissued wastewater general permit Certificate of Coverage
(COC). This COC is reissued pursuant to the requirements of North Carolina General Statute 143-215.1 and the
Memorandum of Agreement between the state of North Carolina and the U.S. Environmental Protection Agency,
dated May 9, 1994 (or as subsquently amended).
The following information is included with your permit package:
* A copy of the Certificate of Coverage for your treatment facility
* A copy of General Wastewater Discharge Permit NCG500000
* A copy of a Technical Bulletin for General Wastewater Discharge Permit NCG500000
Your coverage under this general permit is not transferable except after notice to DWQ. The Division may require
modification or revocation and reissuance of the Certificate of Coverage. This permit does not affect the legal
requirements to obtain other permits which may be required by DENR or relieve the permittee from responsibility
for compliance with any other applicable federal, state, or local law rule, standard, ordinance, order, judgment, or
decree.
If you have any questions regarding this permit package please contact Aisha Lau of the Central Office Stormwater
and General Permits Unit at [phone], ext. 578
Sincerely,
for Alan W. Klimek, P.E.
cc: Central Files
Stormwater & General Permits Unit Files
Asheville Regional Office
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone]. FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NO. NCG500000
CERTIFICATE OF COVERAGE No. NCG500128
TO DISCHARGE NON -CONTACT COOLING WATER, COOLING TOWER AND BOILER
BLOWDOWN, CONDENSATE AND SIMILAR WASTEWATERS 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,
DUKE ENERGY CORPORATION
is hereby authorized to discharge
HYDROELECTRIC TURBINE COOLING AND
NON -CONTACT COOLING WATER / CONDENSATE
water or similar wastewater from a facility located at
MISSION HYDROELECTRIC PLANT
MISSION DAM ROAD
ANDREWS
CLAY COUNTY
to receiving waters designated as Hiwassee River, a class WS-IV water, in the Hiawassee River Basin in
accordance with the effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III,
and IV of General Permit No. NCG500000 as attached.
This certificate of coverage shall become effective August 1, 2002.
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this day July 26, 2002.
for Alan W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Jonathan Howes, Secretary
A. Preston Howard, Jr., P.E., Director
Thomas D. Smitherman
Nantahala Power & Light Company
301 NP&L Loop Road
Franklin, NC 28734
Dear Permittee:
AAM��A
[DEHNFi
July 24, 1997
Subject: Certificate of Coverage No. NCG500128
Renewal of General Permit
Mission Hydro Station
Clay County
In accordance with your application for renewal of the subject Certificate of Coverage, the Division is forwarding
the enclosed General Permit. This renewal is valid until July 31, 2002. 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 December 6,1983. If any parts, measurement
frequencies or sampling requirements contained in this permit are unacceptable to you, you have the right to request
an individual permit by submitting an individual permit application. Unless such demand is made, this certificate
of coverage shall be final and binding.
The Certificate of Coverage for your facility is not transferable except after notice to the Division. Use the enclosed
Permit Name/Ownership Change form to notify the Division if you sell or otherwise transfer ownership of the
subject facility. The Division may require modification or revocation and reissuance of the Certificate of Coverage.
If your facility ceases discharge of wastewater before the expiration date of this permit, contact the Regional
Office listed below at [phone]. Once discharge from your facility has ceased, this permit may be rescinded.
This permit does not affect the legal requirements to obtain other permits which may be required by the Division of
Water Quality, the Division of Land Resources, 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 the NPDES Group at the address below.
Sincerely,
�p"✓ A. Preston Howard,
cc: Central Files a
Asheville Regional Office
NPDES File
Facility Assessment Unit
P.O. Box 29535, Raleigh, North Carolina 27626-0535 [phone] FAX [phone] p&[e-mail]
An Equal Opportunity Affirmative Action Employer 50% recycled / 10% post -consumer paper

y STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NO. NCG500000
CERTIFICATE OF COVERAGE NO. NCG500128
TO DISCHARGE NON -CONTACT COOLING WATER, COOLING TOWER AND BOILER
BLOWDOWN, CONDENSATE, EXEMPT STORMWATER, COOLING WATERS ASSOCIATED WITH
HYDROELECTRIC OPERATIONS, AND SIMILIAR WASTEWATERS 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,
Nantahala Power & Light Company
is hereby authorized to discharge
cooling water and other waters associated with hydroelectric operations
from a facility located at
Mission Hydro Station
Mission Dam Road
Andrews
Clay County
to receiving waters designated as subbasin 40501 in the Hiwassee River Basin
in accordance with the effluent limitations, monitoring requirements, and other conditions set forth
in Parts I, II, III and IV of General Permit No. NCG500000 as attached.
This certificate of coverage shall become effective August 1,1997.
This certificate of coverage shall remain in effect for the duration of the General Permit.
Signed this day July 24,1997.
A. Preston Howard, Jr., P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

Letter to N.E. TUCKER, JR
January 28,1997
NCG500128 INVOICE FOR RENEWAL OF
NPDES PERMIT
Check here if you do NOT wish to renew this permit.
Please return this page along with a letter documenting your reasons
for not requesting renewal to:
Mr. Charles H. Weaver, Jr.
Division of Water Quality/WQ Section
NPDES Group
Post Office Box 29535
Raleigh, North Carolina 27626-0535
0 Check here if you wish to renew this permit.
Please verify that the following information is documented accurately:
Mailing Address
N.E. TUCKER, JR
NANTAHALA P&L/MISSION HYDRO
P.O. BOX 260
FRANKLIN, NC 28734
[phone]
Fax number: [phone]
e-mail address:
Facility Location
N.E. TUCKER, JR
NANTAHALA P&L/MISSION HYDRO
CARROLL LAKE ROAD
ANDREWS, NC 28901
❑ No revision required.
X❑ Revision required. (Please specify below.)
THOMAS D. SMITHERMAN
NANTAHALA POWER & LIGHT COMPANY
301 NP&L LOOP RD. - FRANKLIN, NC 28734
[phone]
No revision required.
© Revision required. (Please specify below.)
NP&L/MISSION HYDRO
MISSION DAM RD. OFF MISSION ROAD
Please return this page with your letter requesting renewal, and $400 fee (payable to NCDEHNR) to:
Mr. Charles H. Weaver, Jr.
Division of Water Quality/WQ Section
NPDES Group
Post Office Box 29535
Raleigh, North Carolina 27626-0535
Signature of applicant or authorized representative
Date 2 - 2 0 -9 -1

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State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
N. E. Tucker, Jr.
Star Route
Topton, NC 28781
Dear Mr. Tucker.
EDEHNF10
September 10, 1993
Subject: General Permit No. NCO500000
Mission Hydro Station
COC NCG500128
Clay County
In accordance with your application for discharge permit received on June 24, 1993, we are forwarding
herewith the subject certificate of coverage to discharge under the subject state - NPDES general 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 US Environmental Protection agency dated
December 6, 1983.
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to request an individual permit by submitting an individual permit
application. Unless such demand is made, this certificate of coverage shall be final and binding.
Please take notice that this certificate of coverage is not transferable except after notice to the Division
of Environmental Management. The Divsion of Environmental Management may require modification or
revocation and reissuance of the certificate of coverage.
This permit does not affect the legal requirements to obtain other permits which may be required by the
Division of Environmental Management or permits required by the Division of Land Resources, 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 Mr. Randy Kepler at telephone number
919/733-5083.
Sincerely,
Original Signed By
Coleen H. Sullins
A. Preston Howard, Jr., P. E.
cc: Fran McPherson
Asheville Regional Office
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

STATE OF NORTH CAROLINA
DEPARTIVENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF ENVIRONMENTAL MANAGEMENT
► ._ ' :- _ : ►I_ .M_ ► 1 ► III 1 1
TO DISCHARGE NON -CONTACT COOLING WATER, COOLING TOWER AND BOILER BLOWDOWN,
CONDENSATE AND SHVIILIAR WASTEWATERS UNDER THE
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,
Nantahala Power and Light Company
is hereby authorized to continue operation of a treatment system for the generation of non -contact cooling waters,
boiler water blowdown or similar waste streams with the discharge of treated wastewater from a facility located at
Mission Hydro Station
on NCSR 1300
Clay County
to receiving waters designated as the Hiwassee River in the Hiwassee River Basin
in accordance with the effluent limitations, monitoring requirements, and other conditions set forth in Parts I, H, III
and IV of General Permit No. NCG500000 as attached.
This certificate of coverage shall become effective September 10,1993
This Certificate of Coverage shall remain in effect for the duration of the General Permit.
Signed this day September 10,1993
Original Signed By
Coleen H. Sullins
A. Preston Howard, Jr., P.E.,Director
Division of Environmental Management
By Authority of the Environmental Management Commission

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SOr, PPTr)RITY PROJECT: Yes No x
TF YES, SOC NUMBER
TO: PERMITS AND ENGINEERING UNIT
WATER QUALITY SECTION
ATTENTION: Randy Kepler
DATE: July 2h, 1gg3
VUL 2 , I: `J
TECF1&CAL SUPPORT BRANCH
NPDES STAFF REPORT AND RECOMMENDATIO-N- -r."- --
COUNTY Clay
PERMIT NUMBER NCG500128
D�-OS-p 1
PART I - GENERAL INFORMATIONn Wasst��
1. Facility and Address: Mission Hydroelectric Plant
Hayesvi_11e, North Carolina
Clay Co_
2. Date of Investigation:
3.
Report Prepared By:
Kerry S. Becker
4.
Persons Contacted and Telephone
Number:
Noah Johnson, Jr.
704-321-5633
5.
Directions to Site: The
facility is located
on NCSR 1300 just east
of the Cherokee County
line.
6.
Discharge Point(s), List
for all discharge
points:
Latitude: 350 03' 53"
Longi.tnrie: 830
55' 44"
Attach a USGS map extract and indicate treatment facility site and
discharge point on map.
U.S.G.S. Quad No. G3 SW U.S.G.S. Quad Name Peachtree, NC
7. Site size and expansion area consistent with application? N/A
Yes No If No, explain:
Page 1 PLOTTED

8. Topography (relationship to flood plain included): Steep,
mountainous. This is a hydroel.ectrirr plant.
9. Location of nearest dwelling: >500 ft.
10. Receiving stream or affected surface waters: Hiwassee River
a. Classification: WS-IV
b. River Basin and Subbasin No.: 04-05-01
C. Describe receiving stream features and pertinent downstream
uses: Water supply for the Town of Murphy; provides habitat
for the propagation and maintenance of wildlife.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted N/A MGD (Ultimate
Design Capacity)
e. Please provide a description of existing or substantially
constructed wastewater treatment facilities: No treatment
facilities---non-contact cooling water discharge.
f. Please provide a description of proposed wastewater treatment
facilities: N/A
g. Possible toxic impacts to surface waters: None expected.
3. Treatment plant classification (attach completed rating sheet):
Not rated, cooling water discharge.
4. SIC Codes(s): 4911
Wastewater Code(s) of actual wastewater, not particular facilities
i.e., non -contact cooling water discharge from a metal plating
company would be 14, not 56.
Primary 14 Secondary
Main Treatment Unit Code: 000-0
0
Page 2

PART IV - EVALUATION AND RECOMMENDATIONS
This is a hydroelectric plant_ Th-- non -contact cooling water
discharge originates from the hi -hi np , during power generation.
There should be no problems r-esii l f- i iia from the issuance of this
permit. ( ems' • D,4
r
Signatur_ of Report Preparer
:te-r;0iiality Regional Supervisor
Date
Page 3

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