NC0027359_Permit (Issuance)_20130405

NPDES DOCUHENT :MCANNINO COVER SHEET
NPDES Permit:
NC0027359
Hiwassee
Hydro Plant
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Permit
History
Document Date:
April 5, 2013
This document is printed on reuse paper - ignore any
content on the reverse side

ATA
bENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Pat McCrory Charles Wakild, P. E. John E. Skvarla, III
Govemor Director Secretary
April 5, 2013
Mr. Jason Neely
Plant Manager
Hiwassee Hydro Plant
1101 Market Street LP 3D
Chattanooga, Tennessee 37402
Subject: Issuance of NPDES Permit Renewal
Permit NC0027359
Hiwassee Hydro Plant
Cherokee County
Dear Mr. Neely:
The Division of Water Quality (Division) personnel have reviewed and approved your application for
renewal of the subject permit. Accordingly, we are forwarding the attached NPDES discharge permit. It
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.
There are no changes to this permit from the draft permit dated February 13, 2013, and no changes from
your current permit except for minor narrative updates.
If any parts, measurement frequencies, or sampling requirements contained in this permit are
unacceptable, you have the right to an adjudicatory hearing upon written request within thirty (30) days
after receiving this letter. Your request must take the form of a written petition conforming to Chapter
150B of the North Carolina General Statutes, and must be filed with the Office of Administrative
Hearings, 6714 Mail Service Center, Raleigh, North Carolina 27699-6714. Unless such demand is made,
this permit remains fmal and binding.
This permit is not transferable except after notifying the Division of Water Quality. The Division may
modify and re -issue, or revoke this permit. Please notice that this permit does not affect your legal
obligation to obtain other permits required by the Division of Water Quality, the Division of Land
Resources, the Coastal Area Management Act, or other federal or local governments.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] l FAX: [phone]
Internet www.ncwateraualitv.orq
Noe Cazolina
�tllt'Qlllf
An Equal opportunity 1 Affirmative Action Employer

If you have questions, or if we can be of further service, please contact Jim McKay at
[e-mail] or call [phone].
Sincerely,
Charles Wakild, P.E.
Enclosure: NPDES Permit FINAL NC0027359 - Hiwassee Hydro Plant
cc: NPDES Unit
Central Files
Asheville Regional Office/Surface Water Protection

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
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, the
Tennessee Valley Authority
is hereby authorized to discharge wastewater from a facility located at
Hiwassee Hydro Plant
at the Hiwassee Dam
west of Hiwassee Village
Cherokee County
to receiving waters designated as the Hiwassee River in the Hiwassee River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in
Parts I, II, III, and IV hereof.
This permit shall become effective May 1, 2013.
This permit and authorization to discharge shall expire at midnight on August 31, 2017.
Signed this day April 5, 2013.
Charles Wakild, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NC0027359
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.
Tennessee Valley Authority is hereby authorized to:
1. Continue to discharge water from a station sump which receives flow from wheel pit leakage
and power house floor drains (Outfall 001), discharge unwatering sump water (Outfall 002),
discharge non -contact cooling water (Outfalls 003 and 004), and discharge station sump
water, as well as upper and lower gallery drain water (Outfall 005), located at Hiwassee
Hydro Plant, at the Hiwassee Dam, west of Hiwassee Village, Cherokee County and
2. Discharge from said facility at the location specified on the attached map into the Hiwassee
River which is classified C waters in the Hiwassee River Basin.
Page 2 of 7

Permit NC0027359
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Hiwassee Hydro Plant
State Grid/Quad: G2tlW/Unaka,NC Dralnace0aslq; Hiwassee River Basin
AFacility
Location 4011111111P)
Latitude! 35.0r or N Sub.easint 04-QS-02
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(not to Score)
tcnn itude: 24 10'41' W HUC: 0602000207
ReceivineStream: Hivrassee River
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NPaESPerinitNo, NC0027359
Stream Haut C
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Cherokee County
Page 3 of 7

Permit NC0027359
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to
discharge waters from the station sump (receiving flow from Unit 1 floor drains and wheel pit leakage) from Outfall
001. Such discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
:Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location 1
Flow
Quarterly'
Estimate
E
Oil and Grease2
15 mg/L
20 mg/L
Quarterly
i E
pH3
E
Notes:
1 Sample locations: E — Effluent.
2 In lieu of' an oil and grease analysis, the tailrace shall be visually inspected for oil sheens at least once a quarter at this
hydroelectric facility. Confirmation that a visual inspection was conducted should be clearly noted on the Discharge Monitoring
Report (DMR) form.
3 The pH 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.
Best management practices must be employed to ensure that excessive pollutants are not discharged to the surface
waters of the State. These practices should include, as a minimum, changing oil absorbent pads quarterly and cleaning
accumulated sediment in the bottom of the sump routinely.
Chemical wheel pit cleaning is permitted on a monthly basis. When cleaning of the wheel pit occurs, the tailrace shall be
inspected visually for foam and oil. Cleaning shall be conducted only with pre -approved solvents. Should the Permittee
wish to change cleaning solvents, a written request should be made to the Division including the MSDS for the proposed
solvent.
This permit does not limit mechanical cleaning operations which do not contribute any wastewater to the discharge. Non -
discharging cleaning operations may be conducted as often as necessary to ensure safety and proper facility operation.
The Permittee shall obtain authorization from the Division prior to the use of any chemical additive in the discharge.
The Permittee shall notify the Director in writing at least ninety (90) days prior to instituting use of any additional
additive in the discharge that may be toxic to aquatic life (other than additives previously approved by the Division).
Such notification shall include completion of Biocide Worksheet Form 101 (if applicable), a copy of the MSDS for
the additive, and a map indicating the discharge point and receiving stream.
Monitoring results obtained during the previous calendar quarter shall be recorded and reported on a Discharge
Monitoring Report (DMR) form and postmarked no later than the 306 day following the completed reporting period The
first DMR is due on the 301h day of the month following the calendar quarter in which the permit was issued. The Permittee
shall confirm in writing that BMPs have been employed as specified in this permit with each DMR submitted.
There shall be no discharge of floating solids or visible foam (other than trace amounts) in the effluent.
Page 4 of 7

Permit NC0027359
A. (2). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to
discharge waters from draft tube unwatering operations from Outfall 002. Such discharges shall be limited and
monitored by the Permittee as specified below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location'
Flow
Quarterly
Estimate
E
Oil and Grease 2
15 mg/L
20 mg/L
Quarterly
E
pH 3
E
Notes:
t Sample locations: E — Effluent.
2 In lieu of an oil and grease analysis, the tailrace shall be visually inspected for oil sheens at least once a quarter at this
hydroelectric facility. Confirmation that a visual inspection was conducted should be clearly noted on the Discharge Monitoring
Report (DMR) form.
3 The pH shall not be Tess than 6.0 standard units nor greater than 9.0 standard units unless ambient river conditions prevent
compliance with this range.
Best management practices must be employed to ensure that excessive pollutants are not discharged to the surface
waters of the State. These practices should include, as a minimum, changing oil absorbent pads quarterly and cleaning
accumulated sediment in the bottom of the sump routinely.
Chemical wheel pit cleaning is permitted on a monthly basis. When cleaning of the wheel pit occurs, the tailrace shall be
inspected visually for foam and oil. Cleaning shall be conducted only with pre -approved solvents. Should the Permittee
wish to change cleaning solvents, a written request should be made to the Division including the MSDS for the proposed
solvent.
This permit does not limit mechanical cleaning operations which do not contribute any wastewater to the discharge. Non -
discharging cleaning operations may be conducted as often as necessary to ensure safety and proper facility operation.
The Permittee shall obtain authorization from the Division prior to the use of any chemical additive in the discharge.
The Permittee shall notify the Director in writing at least ninety (90) days prior to instituting use of any additional
additive in the discharge that may be toxic to aquatic life (other than additives previously approved by the Division).
Such notification shall include completion of Biocide Worksheet Form 101 (if applicable), a copy of the MSDS for
the additive, and a map indicating the discharge point and receiving stream.
Monitoring results obtained during the previous calendar quarter shall be recorded and reported on a Discharge
Monitoring Report (DMR) form and postmarked no later than the 30'h day following the completed reporting period. The
first DMR is due on the 30'h day of the month following the calendar quarter in which the permit was issued The Permittee
shall confirm in writing that BMPs have been employed as specified in this permit with each DMR submitted
There shall be no discharge of floating solids or visible foam (other than trace amounts) in the effluent.
Page 5 of 7

Permit NC0027359
A. (3). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to
discharge once -through cooling waters from generator air cooling and bearing cooling from Outfalls 003 and 004.
Such discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location'
Flow
Semi-annually ,
Estimate
11'
Temperature 2
2
2
l
pH 3
I_.:
Notes:
1 Sample locations: E —Effluent.
2 The temperature of the effluent will be regulated so that the temperature of the receiving stream does not increase more than 2.8°C
above the natural water temperature. Receiving water temperature shall not exceed a maximum of 29°C due to the facility's
operation.
3 The pH 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.
The Permittee shall obtain authorization from the Division prior to the use of any chemical additive in the discharge.
The Permittee shall notify the Director in writing at least ninety (90) days prior to instituting use of any additional
additive in the discharge that may be toxic to aquatic life (other than additives previously approved by the Division).
Such notification shall include completion of Biocide Worksheet Form 101 (if applicable), a copy of the MSDS for
the additive, and a map indicating the discharge point and receiving stream.
Monitoring results obtained during the previous calendar quarter shall be recorded and reported on a Discharge
Monitoring Report (DMR) form and postmarked no later than the 30t day following the completed reporting period. The
first DAD? is due on the 30`h day of the month following the calendar quarter in which the permit was issued
There shall be no discharge of floating solids or visible foam (other than trace amounts) in the effluent.
Page 6 of 7

Permit NC0027359
A. (4). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to
discharge waters from the lower and upper gallery drains, and waters from Unit 2 floor drains and wheel pit
leakage, from Outfall 005. Such discharges shall be limited and monitored by the Permittee as specified below:
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Estimate
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Oil and Grease2
15 mg/L
20 mg/L
Quarterly
E
pH3
E
Notes:
1 Sample locations: E — Effluent.
2 In lieu of an oil and grease analysis, the tailrace shall be visually inspected for oil sheens at least once a quarter at this
hydroelectric facility. Confirmation that a visual inspection was conducted should be clearly noted on the Discharge Monitoring
Report (DMR) form
3 The pH 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.
Best management practices must be employed to ensure that excessive pollutants are not discharged to the surface
waters of the State. These practices should include, as a minimum, changing oil absorbent pads quarterly and cleaning
accumulated sediment in the bottom of the sump routinely.
Chemical wheel pit cleaning is permitted on a monthly basis. When cleaning of the wheel pit occurs, the tailrace shall be
inspected visually for foam and oil. Cleaning shall be conducted only with pre -approved solvents. Should the Permittee
wish to change cleaning solvents, a written request should be made to the Division including the MSDS for the proposed
solvent.
Mechanical cleaning operations which do not contribute any wastewater to the discharge are not limited by this permit.
Non -discharging cleaning operations may be conducted as often as necessary to ensure safety and proper facility operation.
The Permittee shall obtain authorization from the Division prior to the use of any chemical additive in the discharge.
The Permittee shall notify the Director in writing at least ninety (90) days prior to instituting use of any additional
additive in the discharge that may be toxic to aquatic life (other than additives previously approved by the Division).
Such notification shall include completion of Biocide Worksheet Form 101 (if applicable), a copy of the MSDS for
the additive, and a map indicating the discharge point and receiving stream.
Monitoring results obtained during the previous calendar quarter shall be recorded and reported on a Discharge
Monitoring Report (DMR) form and postmarked no later than the 30th day following the completed reporting period The
first DMR is due on the 30th day of the month following the calendar quarter in which the permit was issued. The Permittee
shall confirm in writing that BMPs have been employed as specified in this permit with each DMR submitted
There shall be no discharge of floating solids or visible foam (other than trace amounts) in the effluent
Page 7 of 7

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0027359
Facility Information
Applicant/Facility Name:
Tennessee Valley Authority — Hiwassee Hydro Plant
Applicant Address:
1101 Market Street, LP 3D, Chattanooga, TN 37402
Facility Address:
Hiwassee Dam west of Hiwassee Village; Cherokee County, NC
Permitted Flow
Not limited
Type of Waste:
100% industrial; SIC: 4911 Primary: 48
Facility/Permit Status:
Class I /Active; Renewal
County:
Cherokee County
Miscellaneous
Receiving Stream:
Hiwassee River
Regional Office:
Asheville
Stream Classification:
C
State Grid / USGS Quad:
G2NW/Unaka, NC
303(d) Listed?
No
Permit Writer:
Jim McKay
Subbasin:
04-05-02
Date:
4/1/2013
Drainage Area (mi2):
N/A
HUC:
060200020705
Summer 7Q10 (cfs)
250
o84° ,�
Lat. 35 09' 01" N Long. 10 41 W
Winter 7Q10 (cfs):
N/A,
30Q2 (cfs)
N/A
Average Flow (cfs):
N/A
IWC % :
( )
N/A (variable flow
—not limited)
BACKGROUND
The Hiwassee Hydro Plant produces electricity via hydraulic turbine generation. The facility produces
an average of 662 megawatt -hours per day of power, with peak power generation at 3,604 megawatt -
hours per day. The Asheville Regional Office notes that most of the Hiwassee River's flow is run
through the facility for power production.
The plant has five permitted outfalls as follows:
001: waters from the station sump
002: waters from the draft tube unwatering operations
003 and 004: once through cooling water from generator air and bearing cooling
005: waters from upper galley drains and Unit 2 floor drains and pit leakage
None of the outfalls contain a limit for flow and all employ Best Management Practices (BMPs) rather
than monitoring for pH, oil and grease, and temperature. BMPs are accepted to confirm compliance as a
result of the physical construction of the hydroelectric dam. Each DMR report contains a statement
affirming that BMPs are being used on site. The staff report and permit fact sheet from the 1998 permit
renewal indicate that a general permit is not entirely appropriate for this facility due to using BMPs
instead of sampling for some outfalls, and difficulty sampling others.
Instream Monitoring and Verification of Existing Conditions and DMR Data Review
This facility discharges to the Hiwassee River (classified C) in sub -basin 04-05-02 (Hiwassee River
Basin). The facility does not currently perform instream monitoring. Discharge Monitoring Reports
(DMRs) for flow (the only monitored parameter) were reviewed from 2010 to June 2012. Average flows
from the five outfalls are displayed below:
Flow (MGD)
Outfall 001
Outfall 002
Outfall 003
Outfall 004
Outfall 005
0.4
0.003
3.96
0.29
0.1
l'aet Sheet
NPDES NC0027359 Draft Renewal
Pale 1

PERMITTING STRATEGY:
Waste Load Allocation (WLA)
The Division prepared the last WLA in 1985. The previous and current effluent limits were based on
guidelines and water quality standards. The Division has judged previous parameters and limits to be
appropriate for renewal. The 2012 Hiwassee River Basinwide Water Quality Plan reports that the
receiving stream is currently supporting all designated uses and provides no recommendations for this
discharger.
Reasonable Potential Analysis (RPA)
Since toxicants are not monitored in this discharge, no reasonable potential analysis was performed.
SUMMARY OF PROPOSED CHANGES
There are no proposed changes to this permit.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: February, 2013 (est)
Permit Scheduled to Issue: April, 2013 (est)
NPDES DIVISION CONTACT
If you have questions regarding any of the above information or on the attached permit, please contact
Jim McKay at [phone], or by email at [e-mail].
NAME:
REGIONAL OFFICE COMMENTS
DATE: — / 2 /
NAME: DATE:
SUPERVISOR: DATE:
Fact Sheet
NPDES NC0027359 Draft Renewal
Pace 2

NPDES Permit Renewal
Regional Office Comments
qi -na
NC0027539
Hiwassee Hydro Plant
Cherokee
Asheville
March 28, 2013
Linda Wiggs
Wanda Frazier
ew
Jim McKay
Chuck Cranford
Q Issue permit according to Draft
❑ Make changes as noted below
Class I (100% Industrial Process & Commercial)
SIC: 4911 Electric Services Primary: 48 (25 employees)
WWTP type: Hydroelectric turbine operation with 5 outfalls:
Outfall 001: discharge from power house unit 1 floor drains and wheel
pit leakage
Outfall 002: discharge from draft tube unwatering operations
Outfalls 003 & 004: discharge from units 1 & 2 generator air and bearing
non -contact cooling water
Outfall 005: discharge from sump and station sump from: upper gallery
drains, lower gallery drains, unit 2 floor drains, and unit 2 wheel pit
leakage
WWTP location: 600 Powerhouse Road @ the Hiwassee Dam, west of Hiwassee
Village, near Murphy 28906
The lat & long on the 1-28-13 fact sheet is slightly different. The map is ok.
Latitude: 35° 09' 01" N
Longitude: 84° 10' 41" W
Also, the fact sheet address:
(400 West Summit Hill Drive, Knoxville, TN 37902)
is different from the permittee's 2012 application.
Jason Neely, Plant Manager
TVA Hiwassee Hydro Plant
1101 Market Street, LP 3D
Chattanooga, TN 37402
The draft permit looks good. ARO recommends issuance.
S:1SWP12-Templates&Forms\Permit ReviewWPDESPermitReview ROComments.Feb2012.docx

CARTERET COUNTY,
NORTH CAROLINA
AFFIDAVIT OF PUBLICATION
Before the undersigned, a notary public of said County and State, duly commis-
sioned, qualified, and authorized by law to administer oaths, personally appeared
Misty L. Poff
who being
first duly sworn, deposes and says that he (she) is Clerk
(Owner, partner, publisher or other officer or employee
authorized to make this affidavit)
of THE CARTERET PUBLISHING CO., INC., engaged in the publication of a
newspaper known as CARTERET COUNTY NEWS -TIMES, published, issued,
and entered as second class mail in the Town of Morehead City, in said County
and State; that he (she) is authorized to make this affidavit and sworn statement;
that the notice or other legal advertisement, a true copy of which is attached here-
to, was published in CARTERET COUNTY NEWS -TIMES on the following
dates: 02/ 15/2013
and that the said newspaper in which such notice, paper, document, or legal adver-
tisement was published was, at the time of each and every such publication, a news-
paper meeting all of the requirements and qualifications of Section 1-597 of the
General Statutes of North Carolina and was a qualified newspaper within the mean-
ing of Section 1-597 of the General Statutes of North Carolina.
This 15th day of February, 2013
ignature,•f person makingvit)
Sworn and subscribed to before me, this:
15th day of February, 2013
• e
Q 1) 1G Q, h/mot a f�B
s
e�
t%.07cno
My cosion expires a?�'
RFr co''?
-e4LIT
Notary Public
November 11, 2017
Public Notice
North Carolina
Environmental Management
Commission/NPDES Unit
1617 Mall 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 propcbed permit will be
accepted until 30 days after the publish date of this notice.
The Director of the NC Division of Water Quality (DWQ)
may hold a public hearing should there be a significant
degree of public interest.
Please mail comments and/or information requests to DWQ
at the above address. Interested persons may visit the
DWQ at 512 N. Salisbury Street, Raleigh, NC to review
information on file. Additional information on NPDES
permits and this notice may be' found on our website:
http://portaincdenr.org/web/wq/swp/ps/npdes/calendar, or
by calling [phone].
Tennessee Valley Authority requested renewal of Permit
NC0027359 for Hiwassee Hydro Plant in Cherokee County;
this discharge of hydropower dam discharge'is to the
Hiwassee River.
Tennessee Valley Authority requested renewal of Permit
NC0027332 for Chatuge Hydro Plant In Clay County; this
discharge of hydropower dam discharge is to the Hiwassee
River. Tennessee Valley Authority applied for a renewal of
NPDES Permit NC0027341 for Fontana Hydro Plant in
Graham County. Facility discharges once -through water to
the Little Tennessee River within the Little Tennessee River
Basin. F15
• 13102343
10515073

NP
icy
ES PE ; IT APPLICATION - SHO T FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
Dail 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
1. Contact Information:
Owner Name
Facility Name
Mailing Address
City
State / Zip Code
Telephone Number
Fax Number
e-mail Address
NC0027359
Please print or type.
Tennessee Valley Authority
Hiwassee Hydro Plant
1101 Market Street, LP 3D
Chattanooga
Tennessee 37402
[phone]
[phone]
[e-mail]
2. Location of facility producing discharge:
Check here if same as above ❑
Street Address or State Road
City
State / Zip Code
County
600 Powerhouse Road
near Murphy
North Carolina, 28906
Cherokee
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
4. Ownership Status:
Federal El
Tennessee Valley Authority
1101 Market Street, LP 3D
Chattanooga
Tennessee 37402
[phone]
[phone]
State ❑ Private ❑
Public ❑
Page 1 of 5 C-MI 10108

NP
ES PERMIT APPLICATION - SHORT F sr RIti C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
5. Standard Industrial Classification (SIC) code(s): 4911 - Electric Services
6. Number of employees: 25
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.
Water discharged from Outfalls 001, 002, and 005 includes floor drains, wheel pit
leakage, draft tube unwatering operations, and lower and upper gallery drains collected in
sumps. Refer to the enclosed flow schematic. Oil absorbent pads are used in sumps and
points of equipment oil leaks. These pads are changed at least once per quarter in
addition to the removal of sediment to ensure that excessive pollutants are not
discharged to surface waters of the State. It is assumed that the oil absorbent pads treat
100% of the volume before discharge at normal flow.
S. Is facility covered under federal effluent limitation guidelines? No / / Yes ❑
If yes, specify the category?
9. Principal product(s) produced: Electric Power
Principal raw material(s) consumed: N/A
Briefly describe the manufacturing process(es):
TVA's conventional hydro plants typically include a dam to control the flow of a river, a
powerhouse containing turbines and generators to make electricity, a switchyard to step up the
electricity's voltage for distribution to customers, and a large reservoir of water behind the dam.
Water from the upper reservoir flows through a penstock (a large pipe connecting the reservoir
to the powerhouse) impacting the blades of a turbine. Water impacting the blades makes the
turbine rotate. A large diameter shaft connects the rotating turbine to a generator in the
powerhouse. The generator consists of a large rotating electromagnet (driven by the turbine)
located in the middle of an even larger set of stationary wire coils. When running at the proper
speed (typically around 100 revolutions per minute for TVA hydro generators), electricity is
produced in the coils at anywhere from about 13,000 to 23,000 volts. Generator leads take the
electricity to the switchyard where the voltage is increased and put into the TVA transmission
system for delivery to distributors across the Tennessee Valley. The water used to turn the
turbine then flows out of the powerhouse in a draft tube where it is released into the water
supply. Hiwassee Hydro Plant has two units, one conventional hydroelectric unit, and one
reversible pump storage/hydroelectric unit.
Page 2 of 5 C-MI 10/08

NPDES PERMIT APPLICATION - SE{O T FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
10. Amount of principal product produced or raw material consumed
'List specific amounts consumed and/or units of produc
Product Produced or Raw Material
Consumed
(AVERAGE)
Product Produced or Raw Material
Consumed
(PEAK)
per Day
662.328 kWh generation
3,604,000 kWh generation
per Month
20,145,806 kWh generation
53,957,000 kWh generation
per Year
241,750,000 kWh generation
326,906,000 kWh generation
11. Frequency of discharge: Continuous* ® Intermittent ❑
If intermittent:
Days per week discharge occurs:
* While individual discharges may not flow continuously, it is unlikely that there would be no discharge from
any outfall on any given day unless both units were in outage.
12. Types of wastewater discharged to surface waters only
Duration:
Discharge
Flow*
(GALLONS PER DAY)
Sanitary - monthly average
No discharge to surface water (subsurface disposal)
Utility water, etc. - monthly average
N / A
Process water - monthly average
432,000 (Outfall 001), 7,200,000 (Outfall 002**), and
1,641,000 (Outfall 005)
Stormwater - monthly average
N/A
Other - monthly average
Explain: Noncontact Cooling Water
4,250,000
Monthly Average
total discharge (all types)
5,950,000
Note: Flows are estimated for average operating conditions using pump rated capacity or design capacity. **Unwatering
operations (Outfall 002) are intermittent and typically occur approximately once every two years per unit. See attached flow
schematic.
13. Number of separate discharge points: 5 Outfall Identification number(s) Outfalls 001,
002, 003, 004, and 005
14. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
Hiwassee River (See attached map)
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 OATLY for the parameters
currently monitored. Summarize the past 3 years of effluent data.
Parameter
Daily
Maximum
Monthly
Average
Units of
Measurement
Biochemical Oxygen Demand (GODS)
Chemical Oxygen Demand (COD)
Total Organic Carbon
TVA is applying for permit renewal.
Currently no analytical monitoring is
required. Best Management Practices have
been implemented and visual inspections of
the tailrace have been performed in
accordance with the current NPDES permit.
Total Suspended Solids
Ammonia as N
Temperature (Summer)
Temperature (Winter)
pH
Fecal Coliform (If sanitary waste is
present)
Total Residual Chlorine (if chlorine is
used)
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
Hazardous Waste (RCRA) NESHAPS (CAA)
UIC (SDWA) Ocean Dumping (MPRSA)
NPDES NC0027332 Dredge or fill (Section 404 or CWA)
PSD (CAA) Other
Non -attainment program (CAA)
Permit Number
17. List any chemicals that may be discharged (Please list and explain source and potential
amounts.)
Small amounts of Oil and Grease may be discharged from outfalls as oil containing equipment
is located on site. Visual monitoring has occurred and BMPs have been implemented
under the current permit. No visible sheens have been observed.
Page 4 of 5 C-MI 10/08

NPDES PERMIT APPLICATION - SI-II®;, T FORM C - Minor Industrie
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.
Jason D. Neely
Plant Manager
Printed name of Person Signing Title
o
Signa ure of Applicant /ate ,/
/ f
North Carolina 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

Tennessee Valley Authority
Hiwassee Hydro Plant — NC0027359
Sate Grid/Quad: G2NW/Unaka, NC Drainage Basin: Hiwassee River
Latitude: 35° 09' 01 " N
Longitude: 84° 10' 41" W
Receiving Stream: Hiwassee River
Stream Class: C
Hiwassee Hydro Plant
Outfalls 001 - 005
Facility Location
not to scale
NPDES Permit No. NC0027359
Cherokee County

i
Upper
Gallery Drains
Lower
Gallery Drains
Unit 2 Floor Drains
Unit 2 Wheel Pit
Leakage
Generator Air &
Bearing Cooling Water
Intake from Hiwassee River
Draft Tube
Unwatering Operations
Unit 1 Floor Drains
And Wheel Pit Leakage
Potable
Water
Symbols:
1.440 MGD
0
0
0.2016 MGD
1.641 MGD
Unit 1 2.052 MGD
Unit 2 2.606 MGD
D.
Sanitary Sewage Drains
Unwatering
Sump
Station
Sump
Outfall
005
0 > 002
7.200 MGD
Raw River Water, Potable Water, Precipitation, Leakage, or Ground Water
— . — - Non -Contact Cooling Water
Other Wastewater
0 Motor -Driven Pump
Notes:
1. All effluents discharge into the Hiwassee River.
2. Flows are based on pump -rated capacities and maximum design flows.
0 D 001
0.432 MGD
Subsurface Disposal Field
Tennessee Valley Authority
Hiwassee Hydro Plant
NPDES Permit No. NC 0027359
Cherokee County, North Carolina
January 2012