NC0027332_Renewal (Application)_20170310

4
Water Resources
ENVIRONMENTAL QUALITY
March 10, 2017
Mr. David Sorrick, Senior Vice President
Tennessee Valley Authority
1101 Market Street, BR4A
Chattanooga, TN 37402
Subject: Permit Renewal
Application No. NCO027332
Chatuge Hydro Plant
Clay County
Dear Mr. Sorrick:
ROY COOPER
Governor
MICHAEL S. REGAN
Acting Secretmv
S. JAY ZIMMERMAN
Director
The Water Quality Permitting Section acknowledges receipt of your permit application and
supporting documentation received on February 27, 2017. The primary reviewer for this renewal
application is John Hennessy.
The primary reviewer will. review your application, and he will contact you if additional
information is required to complete your permit renewal. Per G.S. 15OB-3 your current permit
does not expire until permit decision on the application is made. Continuation of the current permit
is contingent on timely and sufficient application for renewal of the current permit.
Please respond in a timely manner to requests for additional information necessary to
complete the permit application. If you have any additional questions concerning renewal of the
subject permit, please contact John Hennessy at 919-807-6377 or [e-mail].
cc: Central Files
NPDES .
Asheville Regional Office
Sincerely,
?A" %Ciec pld
Wren Thedford
Wastewater Branch
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh, North Carolina 27699-1617
919-807-6300

d
Tennessee Valley Authority, 1101 Market Street, BR4A, Chattanooga, Tennessee 37402
February 16, 2017
Ms. Wren Thedford
North Carolina Department of Environmental
Quality
Division of Water Resources
NPDES Unit
16,17 Mail Service Center
Raleigh, North Carolina 27699-01617
Dear Ms. Thedford:
TENNESSEE VALLEY AUTHORITY (TVA) - CHATUGE HYDRO (CTH)- NPDES PERMIT NO.
NCO027332 - PERMIT RENEWAL APPLICATION
Enclosed are one signed original and two copies of a complete NPDES permit renewal
application for CTH. There have been no changes since the issuance of the last permit.
Solids may be removed from the station sump manually or using a vacuum truck or similar
device. The waste is analyzed for hazardous constituents and "characterized for appropriate
disposal. Any oil absorbent materials removed from the station sump are handled in a similar
manner.
TVA requests that the following, which is consistent with language currently in General Permit
No. NCG500000 for discharges associated with hydroelectric operations, be included in the
renewed NPDES permit for CTH:
Submittal of monthly Discharge Monitoring Reports (DMRs) shall not be required except
upon demand by the Division. This section supersedes the requirement for submitting
monthly Discharge Monitoring Reports (DMRs) specified in Part U., Section D.2. of this
permit. Even though the submittal of the monthly monitoring reports to the Division is
suspended, all monitoring requirements remain. The data will be maintained on site for a
period of not less than three years.
TVA requests a 30 -day period between the issuance date and the effective date of the reissued
permit. If you have questions or need additional information, please contact Mike Stiefel by
email at [e-mail] or by phone at [phone].
Sincerely,
CZ�L✓
Terry - Cheek
Senior Manager
Water Permits, Compliance, and Monitoring
Enclosures

Ir -
Ms. Wren Thedford
Page 2
February 16, 2017
MBS:SMF
Enclosures
cc (Enclosures - Electronic Distribution):
C. B. Cothron, BR 4A -C
A. R. Deimling, RAC 1A -C
A. L. Moore, OHP 1A-BNT
C. M. Richards, MR BA -C
ECM, ENVrecords

NPDES PERMIT APPLICATION — SNORT FORM C — Minor Industrial
Minor industrial, manufacturing and commercial facilities.
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
I. Contact Information:
Owner Name
Facility Name
Mailing Address
City
State / Zip Code
Telephone Number
Fax Number
e-mail Address
NPDES Permit Number NC0027332
Please print or type.
Tennessee Valley Authority - David W. Sorrick, Sr. VP Power
Operations
Chatuge Hydro Plant
1101 Market Street, LP 3K
Chattanooga
Tennessee 37402
[phone]
[phone]
[e-mail]
2. Location of facility producing discharge:
Check here if same as above ❑
Street Address or State Road Chatuge Dam Road
City near Hayesville
State / Zip Code North Carolina, 28904
County Clay
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 Tennessee Valley Authority
Mailing Address 1101 Market Street, LP 3K
City Chattanooga
State / Zip Code Tennessee 37402
Telephone Number [phone]
Fax Number [phone]
4. Ownership Status:
Page 1 of 5
C -MI 10/08

r.
NPDES PERMIT APPLICATION — SHORT FORM C — Minor Industrial
Minor industrial, manufacturing and commercial facilities.
Federal ® State ❑ Private ❑ Public ❑
S. Standard Industrial Classification (SIC) code(s): 4911 - Electric Services
6. Number of employees None (remotely operated from Hiwassee Hydro Plant)
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 the draft tube unwatering operations, powerhouse .floor drains,
penstock envelope leakage and wheel pit leakage make-up the flows into the sumps for
Outfalls 001 and 002. Oil absorbent pads are used in sumps and points of equipment oil
leaks. These pads are changed at least once a 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 oil and grease volume
before discharge.
8. 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. Chatuge Hydro Plant has one conventional hydroelectric generating unit.
Page 2 of 5 i
, C -MI 10108

NPDES PERMIT APPLICATION - SHORT FORM C - Minor Industrial
Minor industrial, manufacturing and commercial facilities.
10. Amount of principal product produced or raw material consumed
rci c amounts consumed and/or units
Product Produced or Raw Material
Consumed
per Day
81 mWh generation
per Month
2,463 mWh generation
per Year
29,561 mWh generation
11. Frequency of discharge: Continuous*
If intermittent:
Iuction over the last three years)
Product Produced or Raw Material
Consumed
336 mWh generation
9,708 mWh generation
41,798 mWh generation
Intermittent ❑
Days per week discharge occurs: Duration:
* While individual discharges may not flow continuously, it is unlikely that there would be no discharge from
any outfall on any given day unless the unit is in outage.
12. Types of wastewater discharged to surface waters only
Discharge
Sanitary - monthly average
Utility water, etc. - monthly average
Process water - monthly average
Stormwater - monthly average
Other - monthly average
Explain:
Flow*
(GALLONS PER
No discharge to surface water
N/A
960,000 (Outfall 001, Station Sump = 360,000 and
Outfall 002, Umvatering Sump = 600,000**)
N/A
648,000 (Outfall 003 - Noncontact Cooling Water)
Monthly Average
total discharge (all types):�� �1,6608,�00O
*Note: Flows are estimated for average operating conditions using pump rated capacity or design capacity. **Unwal
operations (Outfall 002) are intermittent and typically occur approximately once every two years. See attached flow
schematic.
13. Number of separate discharge points: 3 Outfall Identification number(s) Outfalls 001
002, and 003
14. Name of receiving stream(s) (Provide a map showing the exact location of each outfall, including
latitude and longitude):
Hiwassee River See attached maDj
Page 3 of 5
C -MI 10108

Tom_
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.
hrn,rF. Permittees reauestina renewal should complete the table ONLY for the parameters
16. List all permits, construction approvals and/or applications (check all that apply and provide permit
numbers or check none if not applicable):
Type
Hazardous Waste (RCRA)
UIC (SDWA)
NPDES
PSD (CAA)
Non -attainment program (CAA)
Permit Number Type
NESHAPS (CAA)
Ocean Dumping (MPRSA)
NCO027332 Dredge or fill (Section 404 or CWA)
Other
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.
C -MI 1010B
Page 4 of 5

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.
C. Michael Richards Plant Maria er
Printed name of Person Signing Title
of Applicant
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

Potable
Water
Symbols
Generator Air and
Bearing Cooling Water
Draft Tube Unwatering
Operations
INTAKE FROM CHATUGE RESERVOIR (HIWASSEE RIVER)
Outfall
——•—•—•—•—•——._._._._._._._ _ _ 0_64§M'gl
._._._._ ._.* 003
Unwatering
Sump
7.2 MGD
.......................), 002
PowerHouse Floor Drains
andPenstock Envelope ••••••......•..••...•--• .............
Leakage 1.44 MGD
Station0 .................................................> 001
Sump
Wheel Pit Leakage O""""
Unit1 ....................................30.
Sanitary Sewage Drains Septic Tank -•-•-•......
Subsurface Disposal Field
Raw River Water, Potable Water, Precipitation, Leakage, or Ground Water
Non -Contact Cooling Water
•'•"'•"" Other Wastewater
OMotor -Driven Pump
Notes:
1. All effluents discharge into the Hiwassee River.
2. Flows are based on pump -rated capacities and maximum design flows.
Tennessee ValleyAuthority
Chatuge Hydro Plant
NPDES Permit No. NC 0027332
Clay County, North Carolina
February 2017
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Tennessee Valley Authority
Chatuge Hydro Plant — NCO027332
Sate Grid/Quad: G3SE/Hayesvilfe, NC Hiwassee River
Latitude: 350 01' 09" N
Longitude: 830 47'30"W
Receiving Stream: Hiwassee River
Stream Class: C
N —5—
Facility Location
J
not to scale
NPIDES Permit No. NCO027332
Cherokee County