NCG500225_complete file-historical_20151014

Weaver, Charles
From: Amelia H Boschen (Services - 6) <[e-mail]>
Sent: Thursday, August 25, 2016 9:40 AM
To: Weaver, Charles
Subject: RE: Dominion - Gaston Hydroelectric Power Station, Dye Test
Thank you very much for the quick response.
Amelia Boschen
Environmental Specialist III
Electric Environmental Services
Dominion Resources Inc.
5000 Dominion Boulevard
Glen Allen VA23060
Phone: [phone]
Cell: 804-486-0417
-----Original Message ----
From: Weaver, Charles [mailto:[e-mail]]
Sent: Thursday, August 25, 2016 9:39 AM
To: Amelia H,Boschen (Services - 6); Smith, Danny; Meadows, Susan
Cc: Dawn K Garber (Generation - 3); Charles Allen (Generation - 3); Kenneth Roller (Services - 6); Jason E Williams
(Services - 6); Paula A Hamel (Services - 6); Ian A Whitlock (Services - 6); Michael J Winters (Generation - 34)
Subject: Re: Dominion - Gaston Hydroelectric Power Station, Dye Test
Amelia - Dominion can proceed with the test. The activity you're proposing is not expected to violate the terms and
conditions of General Permit NCG500000.
I have copied our Aquatic Toxicology Branch and the Raleigh Regional Office in case staff at either location have
questions or concerns about the proposed test.
(Danny / Susan - contact Amelia directly if you have questions.)
Thanks for informing the Division in advance of the test.
CHW
Messages sent to or from this address are subject to the North Carolina Public Records Law.
From: Amelia H Boschen (Services - 6) <[e-mail]>
Sent: Thursday, August 25, 2016 9:20:22 AM
To: Weaver, Charles
Cc: Dawn K Garber (Generation - 3); Charles Allen (Generation - 3); Kenneth Roller (Services - 6); Jason E Williams
(Services - 6); Paula A Hamel (Services - 6); Ian A Whitlock (Services - 6); Michael J Winters (Generation - 34)
Subject: Dominion - Gaston Hydroelectric Power Station, Dye Test
Mr. Weaver,

Per our discussion yesterday, Dominion would like to conduct a leak test at the Gaston Hydroelectric Power Station to
verify the functionality of a monitoring well that provides information regarding the stability of the dam structure.
Dominion is proposing to conduct the leak test using less than one pint of Tracing Dye Liquid (SDS attached). As
indicated by the SDS, the dye is non toxic, but will have the effect of dying the affected water a bright green color. Dyed
water is expected to discharge to Roanoke Rapids Lake via outfall 001. The effect of the dye typically degrades in less
than 24 hours.
Please verify that Dominion may conduct this activity as proposed.
Thank you,
Amelia Boschen
Environmental Specialist III
Electric Environmental Services
Dominion Resources Inc.
5000 Dominion Boulevard
Glen Allen VA 23060
Phone: [phone]
Cell: 804-486-0417
CONFIDENTIALITY NOTICE: This electronic message contains information which may be legally confidential and or
privileged and does not in any case represent a firm ENERGY COMMODITY bid or offer relating thereto which binds the
sender without an additional express written confirmation to that effect. The information is intended solely for the
individual or entity named above and access by anyone else is unauthorized. If you are not the intended recipient, any
disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you
have received this electronic transmission in error, please reply immediately to the sender that you have received the
message in error, and delete it. Thank you.
CONFIDENTIALITY NOTICE: This electronic message contains information which may be legally confidential and or
privileged and does not in any case represent a firm ENERGY COMMODITY bid or offer relating thereto which binds the
sender without an additional express written confirmation to that effect. The information is intended solely for the
individual or entity named above and access by anyone else is unauthorized. If you are not the intended recipient, any
disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you
have received this electronic transmission in error, please reply immediately to the sender that you have received the
message in error, and delete it. Thank you.
i
2

K r-0
North Carolina Department of Environmental Quality
Pat McCrory, Governor Donald R. van der Vaart, Secretary
October 14, 2015
Ms. Cathy C. Taylor
Virginia Electric & Power Company - DBA Dominion
5000 Dominion Blvd
Glen Allen, VA 23060
Subject: Renewal of General Permit NCG500000
Gaston Power Station
Certificate of Coverage NCG500225
Halifax County
Dear Permittee:
The Division has renewed the subject General Permit. In response to your request for an updated
Certificate of Coverage (CoC), the Division hereby issues the updated version of NCG500225 under General
Permit NCG550000. 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 Raleigh 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. weaver@ncdenr. gov].
in rely
o . Jay Zimmerman,
Division of Water esources
cc: Raleigh Regional Office
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% Recycledl101/o Post Consumer Paper

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
GENERAL PERMIT NCG500000
CERTIFICATE OF COVERAGE NCG500225
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,
Virginia Electric & Power Company - DBA Dominion
is hereby authorized to discharge from a facility located at
Gaston Power Station
2369 Jack Brown Rd
Roanoke Rapids
Halifax County
to receiving waters designated as the ROANOKE RIVER (Lake Gaston), a class WS-IV & B CA
stream in subbasin 03-02-08 of the Roanoke 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 October 14, 2015.
This Certificate of Coverage shall remain valid for the duration of the General Permit.
Signed this day October 14, 2015
for S-h3frzimmerman, Director
ision of Water Resources
By Authority of the Environmental Management Commission

MmWun R,wurcc SCM1kVl, Inc,
dn�;vu�a:
VIA ELECTRONIC DELIVERY
Email: Charles.weaver®ncdenr.gov
June 8, 2015
NC DENR/DWRIWater Permitting Section
Attn: Charles Weaver
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Re: Notice of Renewal Intent for NPDES General Permit
Roanoke Rapids (NCG500134) and Gaston Power Stations (NCG500225)
Dear Mr. Weaver:
Dominion submitted Notices of Renewal httent for coverage raider the subject NPDES
General Permits for the Roanoke Rapids and Gaston hydroelectric generating stations on
April 15, 2015. We received your email dated May 6, 2015 requesting Clean Water Act
316(b) related information if the design intake flows of our facilities are greater than 2 million
gallons per day (MGD). As hydroelectric generating stations, both facilities pass more than 2
MGD through dam for power generation. Both facilities also use cooling water fed by gravity
from the lake to cool bearings and then return that water through the draft tube or into the
tailrace. The vast majority of the water that flows through the facilities is used for power
generation and not for cooling.
The purpose of the 316(b) Rule for existing facilities (40 CFR 125.90 through 98) which
became effective on October 14, 2015 is to reduce environmental impacts associated with
impingement and entrainment at cooling water intake structures. The Rule applies to
electricity generating facilities with a steam prime mover (Technical Development Document
for the Final Section 316(b) Existing Facilities Rule, May 2014), and the Rule did not
consider hydroelectric facilities in evaluating technologies, costs and benefits. Both the
Roanoke Rapids and Gaston power stations are hydroelectric facilities that do not use a steam
loop and therefore, we do not believe the 316(b) Rule applies to either facility.
To the extent that DENR is evaluating hydroelectric facilities under the 316(b) Rule, neither
the Roanoke Rapids nor Gaston power station use enough cooling water to trigger the
applicability requirements. The Rule only applies to facilities that use 25% or more of the
water intake flow exclusively for cooling purposes (40 CFR 125.91(3)). Both facilities use
less than 0.2% of the water that flows through the darns exclusively for cooling purposes.
Therefore, the Rule requirements, including application submittals, do not apply to either
facility.

North Carolina Department of Environmcnt and Natural Resources
June 8, 2015
Page 2
If you have questions regarding this submittal, please contact Amelia Boschen at (804) 273-
3485 or [e-mail].
dom.com.
Sincerely,
Cathy C. Tay! r

Dominion Resomrce Services, Inc.
5000 Dominion Bordecard, Glen Allen, VA 2,1060
domsom
BY US MAIL
April 15, 2015
NC DENR/DWR/Water Permitting Section
Attn: Charles Weaver
Dominion
RECEIVEDIDENRIDWR
APR 2 2 2015
1617 Mail Service Center Water Quality
Raleigh, North Carolina 27699-1617 Permitting section
RE: Dominion Gaston Power Station, Halifax and Northampton Counties
Notice of Renewal Intent for NPDES General Permit NCG500225
Dear Mr. Weaver:
The Gaston Power Station is a hydroelectric generating station located in Halifax and
Northampton Counties. The station is owned by Virginia Electric and Power Company, doing
business as Dominion. In accordance with the requirements of Part II, Section B.9 of the current
permit, we are submitting the attached Notice of Renewal Intent and supporting documentation
as our application to renew the subject NPDES General Permit (NCG500225). The current
permit coverage expires July 31, 2015.
There have been no material changes in the operation or design of the Gaston Power Station
since the 2012 application and renewal. If you have any questions regarding this submittal,
please contact Amelia Boschen at [phone] or [e-mail].
I certify under penalty of law, that this document and all attachments were prepared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
properly gather and evaluate the information submitted. Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the
information, the information submitted is, to the best of my knowledge and belief, true, accurate,
and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations.
Sincerely,
Cathy
Director, Electric Environmental Services
Attachments

e
��—
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; [term definition see 15A NCAC 02H .0103(19)1
Application for renewal of existing coverage under General Permit NCG500000
RECEIVED/DENR/DWR
Existing Certificate of Coverage (CoQ: NCG500225
APR 2 2 2015
(Press Tab to navigate form)
Water Quality
Permitting Section
1) Mailing address of facility owner/operator: (address to which all correspondence should be mailed)
Company Name Virginia Electric and Power Company dba Dominion
Owner Name Virginia Electric and Power Company dba Dominion
Street Address 5000 Dominion Boulevard
City Glen Allen State VA
Telephone # 804 - 273 - 2929 Fax # 804 - 273 - 2964
Email Address [e-mail]
2) Location of facility producing discharge:
Facility Name Gaston Power Station
Facility Contact Cathy Taylor
Street Address 2369 Jack Brown Road
City Roanoke Rapids State NC
County Halifax and North Hampton Counties
Telephone # 804 - 273 - 2929 Fax # 804 - 273 - 2964
Email Address [e-mail]
3) Description of Discharge:
a) Is the discharge directly to the receiving stream?
104 M
ZIP Code 23060 -
ZIP Code 27870 -
❑ 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):
Two outfalls: Outfalls 001 and 002
Page 1 of 3

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
Outfall (s) #:
OutfalI (s) #:
OutfalI (s) #: _
Outfall (s) #:
Outfall (s) #: 001 and 002
(Please describe "Other"): Outfall 001: Hydroelectric Operations cooling water, seepage, and oil
separator decant water: Outfall 002: Hydroelectric Operations once through cooling water,
d) Volume of discharge per each discharge point (in GPD):
#001: 424,000 (See Addendum) GPD #002: 7,470,000,000 (See Addendum) GPD
#003: GPD #004: GPD
4) Please check the type of chemicals] 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,
settling ponds, 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: Outfall 001: Intermittent
discharge dependine on flow levels in the sump: 002: Intermittent discharge dependine on
Station operating conditions.
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? Variable depending on flow levels, station operating
conditions, and amount of rainfall received.
c) Please check the days discharge occurs: ® Sat. ® Sun. ® Mon. ® Tue. ® Wed. ® Thu. ® Fri.
Page 2 of 3

NCG500000 Renewal Application
Additional Application Requirements:
The following information must be included in duplicate [original + I 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 ISA 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: Edward H. Baine Title: V.P. Power Generation
System Operations
(Please review 15A NCAC 02H .0106fe) for authorized signing officials)
Y� April 15, 2015
Signature of Applicant Date Signed
North Carolina General Statute & 143-215.6B 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 4 of 3

ADDENDUM TO NOTICE OF RENEWAL INTENT
GASTON POWER STATION
1. Volume of Discharge per each discharge point (NOI Item 3.d): The discharge for each
outfall in gallons per day (gpd) is estimated based on historical discharge records and is
believed to be representative of conditions when the station is in operation.
a. Outfall 001: 424,000 gpd (average); 3,160,000 gpd (maximum)
b. Outfall 002: 7.47 x 109 gpd (average); 3.05 x 1010 gpd (maximum)
2. Treatment provided to wastewater before discharge (NOI item 5): As indicated on the
application, no treatment is being provided to -the wastewater prior to discharge.
However, Outfall 001 has an oil skimmer in place which transfers any oil to a drum for
disposal.
3. Receiving waters and stream classification: Roanoke Rapids Lake (Class WS-III B Water)
4. Non -discharge alternatives: Due to the location of the station, proximity to Lake Gaston
and Roanoke Rapids Lake and the nature of the discharge, non -discharge alternatives
such as discharge to a regional sewer collection system, subsurface disposal and spray
irrigation are not practicable for the Gaston Power Station.
5. Note regarding Outfall 002: Outfall 002 is embedded within the dam. Cooling water is
fed by gravity from the lake to cool bearings and is then returned to the water flowing
through the draft tube. Flow is reported as the flow moving through the dam at the
time of sampling. Temperature and pH readings are taken in the tailrace at the
Warren's Landing boat ramp approximately 2 miles downstream from the dam.

ENSRIAECOM
ENSR CONSULTING AND ENGINEERING (NC), INC.
GLEN ALLEN, VA 23060
PHONE, [phone]
FAX. [phone]
WED. HTTP✓/VVV.ENSR.AECOKCOM
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As A
WDENR
North Carolina Department of Environment and Natural Resources
Beverly Eaves Perdue
Governor
Mr. Bob Williams
Dominion Resources Services, Inc.
5000 Dominion Blvd
Glen Allen, VA 23060
Dear Permittee:
Division of Water Quality
Charles Wakild, P.E.
Director
August 3, 2012
Dee Freeman
Secretary
Subject: Renewal of coverage / General Permit NCG500000
Gaston Hydro Station
Certificate of Coverage NCG500225
Halifax County
The Division is renewing Certificate of Coverage (CoC) NCG500225 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 Raleigh 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 john.hennessyCa ncdenr.gov].
Sincerely,
Original signed by John Hennessy
for Charles Wakild, P.E.
cc: Raleigh 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 Oppodunily/Affirmative Action Employer- 50% Recycled/10% Post Consumer Paper
Nne
orthCarolina
Natmally

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NCG500000
CERTIFICATE OF COVERAGE NCG500225
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,
Dominion Resources Services, Inc.
is hereby authorized to discharge Hydroelectric Dam Sumps & Non -contact Cooling Water
from a facility located at
Gaston Hydro Station
2569 Jack Brown Road
Roanoke Rapids
Halifax County
to receiving waters designated as Roanoke Rapids Lake in subbasin 03-02-08 of the
Roanoke 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
Ori inal sioned by John Hennessy
for Charles Wakild, Director
Division of Water Quality
By Authority of the Environmental Management Commission

Dominion Resources services, Inc.
5000 Dominion Boulevard, Glen Allen, VA 23060
Web Address: w .dom.com
BY US MAIL
April 19, 2012
Mr. Charles Weaver
NC DENR/DWQ/NPDES
1617 Mail Service Center
Raleigh, North Carolina
Ark
P"Dominion"
RE: Dominion Gaston Power Station, Halifax and Northampton Counties
Notice of Renewal Intent for NPDES General Permit NCG500225
Dear Mr. Weaver:
The Gaston Power Station is a hydroelectric generating station located in Halifax and
Northampton Counties. The station is owned by Virginia Electric and Power Company, doing
business as Dominion. We are submitting the attached Notice of Renewal Intent and supporting
documentation as our application to renew the subject NPDES General Permit (NCG500225).
The current permit coverage expires July 31, 2012.
There have been no material changes in the operation or design of the Gaston Power Station
since the 2007 application and renewal. If you have any questions regarding this submittal,
please contact Jason Ericson at [phone] or iason.p.ericson(a)dom.com.
Sincerely, O'W
4'
Cathy C. Ta or
Director, Electric Environmental Services
Attachments
n{;m r-5n�\lI?n
6�
vtF:i ER QUALITY
POINT SOURCE BRANCH

NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
NOTICE OF RENEWAL INTENT
Application for renewal of existing coverage under General Permit NCG500000
Existing Certificate of Coverage (CoC): NCG500225
(Please print or type)
1) Mailing address' of facility owner/operator:
Company Name Virginia Electric and Power Company dba Dominion
Owner Name Virginia Electric and Power Company dba Dominion
Street Address 5000 Dominion Boulevard
City Glen Allen State Va ZIP Code 23060
Telephone Number [phone] Fax: [phone]
Email address [e-mail]
` Address to which all permit correspondence should be mailed
2) Location of facility producing discharge:
Facility Name Gaston Power Station
Facility Contact Cathy Taylor
Street Address 2369 Jack Brown Road
City Roanoke Rapids State NC ZIP Code 27870
County Halifax and North Hampton Counties
Telephone Number [phone] Fax: [phone] --
Email address [e-mail] oA fir--'=�
APR 2 3 2012
3) Description of Discharge:
a) Is the discharge directly to the receiving stream? X Yes • No L_
(If no, submit a site map with the pathway to the potential receiving waters clearly marked. This includes tracing the paifiway ofihe i
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):
Two outfalls: Outfalls 001 and 002
c) What type of wastewater is discharged? Indicate which discharge points, if more than one.
• Non -contact cooling water Outfall(s) #:
• Boiler Blowdown Outfall (s) #:
Page 1 of 4

NCG500000 renewal application
• Cooling Tower Blowdown
• Condensate
X Other
Outfall (s) #:
Outfall (s) #:
Outfall (s) #: Outfalls 001 and 002
(Please describe "Other") Outfall 001: Hydroelectric Operations cooling water, seepage and oil
separator decant water: Outfall 002: Hydroelectric Operations once through cooling water:
d) Volume of discharge per each discharge point (in GPD):
#001: See Addendum #002: See Addendum
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
X 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: NA
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.)? • Yes X 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. )
Note: Outfall 001 has an oil skimmer in place which transfers any oil to a drum for disoosal.
7) Discharge Frequency:
a) The discharge is: • Continuous X Intermittent • Seasonal*
i) If the discharge is intermittent, describe when the discharge will occur: Outfall 001: Intermittent
discharge depending on flow levels in the sump; Outfall 002: Intermittent discharge depending on
Station operating conditions
ii) *Check the month(s) the discharge occurs: X Jan X Feb X Mar. X Apr X May X Jun X Jul
X Aug. X Sept. X Oct. X Nov. X Dec. (Note: Discharge may occur during any month of the
ear
b) How many days per week is there a discharge? Variable depending on flow levels, Station operating
conditions, and amount of rainfall received.
c) Please check the days discharge occurs: X Sat. X Sun. X Mon. X Tue. X Wed. X Thu. X Fri.
(Note: Discharge may occur on any day of the week)
Page 2 of 4

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.
Certification
"I certify, under penalty of law, that this document and all attachments were prepared under my direction
orsupervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the
system, or those persons directly responsible for gathering the information, the information submitted is,
to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant
penalties for submitting false information, including the possibility of fines and imprisonment for knowing
violations."
Printed Name of Person Signing: C.D. Holley
Title: Vice President — Fossil. and Hydro System Operations
6 jV-// or 40 1 �,
(Signature of Applicant) (Date Signed)
North Carolina General Statute 143-215.6 b (i) 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 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.)
Mail the original and one copy 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 4

NCG500000 renewal application
ADDENDUM TO NOTICE OF RENEWAL INTENT
GASTON POWER STATION
1. Volume of Discharge per each discharge point (NOI Item 3.d): The discharge for each outfall in
gallons per day (gpd) is based on the estimated discharge recorded through the current permit
for 2009-2011.
a. Outfall 001: 424,000 gpd (average); 3,160,000 gpd (maximum)
b. Outfall 002: 7.47 x 109 gpd (average); 3.05 x 1010 gpd (maximum)
2. Receiving waters and stream classification: Roanoke Rapids Lake (Class WS-III B Water)
3. Non -discharge alternatives: Due to the location of the station, proximity to Lake Gaston and
Roanoke Rapids Lake and the nature of the discharge, non -discharge alternatives such as
discharge to a regional sewer collection system, subsurface disposal and spray irrigation are not
practicable for the Gaston Power Station.
4. Note regarding Outfall 002: Outfall 002 provides non -contact cooling water for upper bearings
on the turbines. As addressed in the 2007 NOI and in NCDENR correspondence, Outfall 002 is
embedded within the dam. Cooling water is fed by gravity from the lake to cool bearings and is
then returned to the water flowing through the draft tube. Flow is reported as the flow moving
through the dam at the time of sampling. Temperature and pH readings are taken in the tailrace
at the Warren's Landing boat ramp approximately 2 miles downstream of the dam.
Page 4 of 4

SITE LOCATION MAP
ENSR AECOfVI GASTON POWER STATION
1
ENSR CONSULTING AND ENGINEERING INC), INC.
GLEN ALLEN, VA 23060 Gallon, North Carlina
PHONE. [phone]
FAX- [phone] BRAWN BY, I DATE, PROJECT NBNBER. DRAWING NUMBER.
VE& HTTP,//VVV.ENSR.AECOM.COM NOT TO SCALE LLM 2/26/07 02285-031 1 of 1

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
Bob Williams
Dominion Resources Services, Inc.
5000 Dominion Blvd
Glen Allen, VA 23060
Subject: Renewal of coverage / General Permit NCG500000
Gaston Hydro Station
Certificate of Coverage NCG500225
Halifax County
Dear Permittee:
In accordance with your renewal application [received on January 29, 20071, the Division is renewing
Certificate of Coverage (CoC) NCG500225 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 Raleigh 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 Jim
McKay [919 733-5083, extension 595 or [e-mail].
Sincerely,
X, -�6 4 �
for Coleen H. Sullins
cc: Central Files
Raleigh 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 Aaturally
An Equal Opportunity/Affirmative Action Employer —50% Recyclerlll0% Post Consumer Paper

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NCG500000
CERTIFICATE OF COVERAGE NCG500225
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,
Dominion Resources Services, Inc.
is hereby authorized to discharge from a facility located at
Gaston Hydro Station
2569 Jack Brown Road
Roanoke Rapids
Halifax County
to receiving waters designated as Roanoke Rapids Lake in subbasin 30208 of the Roanoke
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.
for Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission

Pamela F. Faggert
Vice President and Chief Environmental Officer
Dominion Resources Services, Inc.
5000 Dominion Boulevard, Glen Allen, Virginia 23060
Phone: [phone]
January 26, 2007
Mr. Charles H. Weaver
NC DENR / DWQ / NPDES
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Wh
Dominion
Subj: Notice of Renewal Intent to Renew Existing Coverage Under NPDES General
Permit NCG500225, Gaston Hydro Station, Halifax and Northampton Counties,
Roanoke Rapids, North Carolina
Dear Mr. Weaver:
The Gaston Hydro Power Station, a hydroelectric generating station located in Halifax
and Northampton Counties, is owned and operated by Virginia Electric and Power
Company, a unit of Dominion Resources, Inc. (Dominion). We are submitting the
attached Notice of Renewal Intent and supporting documentation as our application to
renew the subject NPDES general permit (COC Number NCG500225).
Please note the requested revision to the permit in the attached Addendum to the Notice
of Renewal Intent. Dominion requests that Outfal1002 be removed from the permit, in
accordance with the March 4, 2005 letter (attached) from Mr. Myrl Nisely (NC DENR)
regarding a Hydroelectric Compliance Evaluation Inspection performed on February 9,
2005.
There have been no material changes in the operation or design of the Gaston Hydro
Station since our last permit application and renewal. If you have any questions
regarding the station or the attached application, please contact Bob Williams at 804-273-
2994 or Kim Lanterman at 804-273-3051.
cerely,
Pamela F. Faggert
Attachments

1
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): NCG500225
(Please print or type)
1) Mailing address' of facility owner/operator:
Company Name Virginia Electric and Power Company - Gaston Hydro Station
Owner Name Dominion Resources, Inc.
Street Address 5000 Dominion Boulevard
City Glen Allen State VA ZIP Code 23060
Telephone Number 804 273-2994 Fax: [phone]
Email address bob williamsQdom.com
* Address to which all permit correspondence should be mailed
2) Location of facility producing discharge:
Facility Name Gaston Hydro Station
Facility Contact Robert Williams
Street Address 2569 Jack Brown Road
City Roanoke Rapids State NC ZIP Code 27870
County Halifax and Northampton Counties
Telephone Number 804 273-2994 Fax: [phone]
Email address bob williams(@dom.com
3) Description of Discharge:
a) Is the discharge directly to the receiving stream? X 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 outfalls (ditches, pipes, channels, etc. that convey wastewater from the property):
Currently two (2) outfalls (Outfalls 001 and 002}
c) What type of wastewater is discharged? Indicate which discharge points, if more than one.
• Non -contact cooling water Outfall(s) #:
• Boiler Blowdown Outfall (s) #:
Page 1 of 3

NCG500000 renewal application
• Cooling Tower Blowdown Outfall (s) #:
• Condensate Outfall (s) #:
X Other Outfall (s) #: 001 and 002
(Please describe "Other") Outfall 001• Hydroelectric Operations cooling water, seepage, and oil
separator decant water-, Outfall 002• Hydroelectric Operations once through cooling water
d) Volume of discharge per each discharge point (in GPD):
#001: See Addendum #002: See Addendum
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
X 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.)? • Yes X 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 X Intermittent • Seasonal*
i) If the discharge is intermittent, describe when the discharge will occur: Outfall 001: Intermittent
discharge depending on flow levels in the sump; Outfall 002• Intermittent discharge depending on
Station operating conditions.
ii) *Check the month(s) the discharge occurs: • Jan • Feb • Mar. • Apr • May • Jun • Jul
• Aug. • Sept. • Oct. • Nov. • Dec. Note: Discharge may occur in any month of the year.
b) How many days per week is there a discharge? Variable depending on flow levels, Station operating
conditions, and amount of rainfall received.
c) Please check the days discharge occurs: • Sat. • Sun. • Mon. • Tue. • Wed. • Thu. • Fri.
Note: Discharge may occur on any day of the week.
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). Roanoke Rapids Lake
b) Stream Classification: Class WS-III B Water
Page 2 of 3

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: J. David Rives
Title: Vice -President Fossil & Hydro
(Signature of Applicant) (Date Signed)
North Carolina General Statute 143-215.6 b (i) 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 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.)
acEacEacsoeacsaEaEaeocEaEasa
This Notice of Renewal Intent does NOT require a separate fee.
The permitted facility already pays an annual fee for coverage under NCG500000.
acEocaaEecEaEaaa,easocaaEocEa
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

ADDENDUM TO NOTICE OF RENEWAL INTENT
GASTON HYDRO STATION
Page 1 of 3 - Item 1: Mailing Address of Facility Owner/Operator
The Gaston Power Station is owned by Virginia Electric and Power Company and operated by
Dominion Generation. The parent company of Virginia Electric and Power Company is
Dominion Resources, Inc.
Page 2 of 3 - Item 3.d: Volume of Discharge Per Each Discharge Point
The volume of discharge per each of the discharge points/outfalls at the Gaston Power Station
are as follows:
Outfall 001: 340,000 gpd (average); 1,790,000 gpd (maximum)
Outfall 002: 8867.7 cfs = 5.72 x 109 gpd (average); 22,000 cfs =1.42 x 1010 gpd (maximum)
The discharge volumes provided above are based upon the estimated average and maximum
discharge volumes from each outfall for the past three years (2004-2006 data).
Additional Information
Requested Revisions to Existing Certificate of Coverage NCG500225
In accordance with the attached letter of March 4, 2005 (Item 4) from Mr. Myrl Nisely of the
North Carolina Department of Environment and Natural Resources (NCDENR), Division of
Water Quality (DWQ), Dominion requests that Outfall 002 be removed from the permit. As Mr.
Nisely states in his letter, Outfall 002 is embedded and there is no opportunity to sample the
discharge directly. To estimate the flow/discharge volume for Outfall 002, we have been noting
the cubic feet per second (cfs) of water going through the dam at the time of the sampling.
However, this reported flow has no real relationship to the cooling water. As noted in Mr.
Nisely's letter, there is no way to measure the actual volume of cooling water. Based upon this
information, Mr. Nisely and a DWQ permit writer agreed that Outfall 002 is not needed in the
permit. Therefore, Dominion requests that Outfall 002 (and associated monitoring requirements
listed in Part A.2) be removed from the permit.

rMRE I"ER-
2
MET N "m
1 8f 1

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
ROBERT J WILLIAMS
GASTON HYDRO STATION
5000 DOMINION BLVD -WQ DE
GLEN ALLEN, VA 23060
1 ••
NC ENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: Reissue - NPDES Wastewater Discharge Permit
Gaston Hydro Station
COC Number NCG500225
Halifax 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: Cdntral Files
Stormwater & General Permits Unit Files
Raleigh 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. NCG500225
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,
VEPCO
is hereby authorized to discharge
HYDROELECTRIC TURBINE COOLING AND
NON -CONTACT COOLING WATER / CONDENSATE
water or similar wastewater from a facility located at
GASTON HYDRO STATION
2569 JACK BROWN ROAD
ROANOKE RAPIDS
HALIFAX COUNTY
to receiving waters designated as Roanoke Rapids Lake, a class WS-III B water, in the Roanoke 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
Robert J. Williams
VEPCO
5000 Dominion Blvd: WQ Dept.
Glen Allen, VA 23060
e��
[DFEE HNFi
July 24,1997
Subject: Certificate of Coverage No. NCG500225
Renewal of General Permit
Gaston Hydro Station
Halifax County
Note: Effluent limitations for this hydroelectric facility are found on pages A.2. and A.3.
Dear Permittee:
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.
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,
� w
�"✓ A. Preston Howard,
cc: Central Files 6
Raleigh Regional Office
NPDES File
Facility Assessment Unit
P.O. Box 29535, Raleigh, North Carolina 27626-0536 [phone] FAX [phone] p&e®dem.ehnr.state.nc.us
An Equal Opportunity Affirmative Action Employer 50% recycled / 10% post -consumer paper

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NO. NCG500000
CERTIFICATE OF COVERAGE NO. NCG500225
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,
VEPCO
is hereby authorized to discharge
cooling water and other waters associated with hydroelectric operations
from a facility located at
Gaston Hydro Station
End Of Oakwood Avenue
Roanoke Rapids
Halifax County
to receiving waters designated as subbasin 30208 in the Roanoke 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 W. R. CARTWRIGHT January 28,1997
NCG500M INVOICE FOR RENEWAL OF o0
NPDES PERMIT Aoo
m� ti
Check here if you do NOT wish to renew this permit.
Please return this page along with a letter documenting your reasons 2i I ti
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
�x Check here if you wish to renew this permit.
Please verify that the following information is documented accurately:
T
W
U
❑% No revision required. co
Mailing Address
W. R. CARTWRIGHT
VEPCO - GASTON HYDRO STATION
5000 DOMINION BLVD.
GLEN ALLEN,VA 23060
[phone]
Fax number: See below
e-mail address: See below
Facility Location
W. R. CARTWRIGHT
VEPCO - GASTON HYDRO STATION
END OF OAKWOOD AVENUE
ROANOKE RAPIDS, NC 27870
Please contact permit coordinator for
questions or further information:
Name: 1?2 6 .r-r 1. kl;)Ua» s
Telephone Number: 8o4.z73-2_94y
Fax Number: goo - z73-296v
Revision required. (Please specify below.) S
t
N
�g No revision required.
❑ Revision required. (Please specify below.)
E-mail address: robcrt_w llia�s( ✓a power. cow
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
CG

5000 Dominion Boulevard
Glen Allen, Virginta 23060
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
February 24, 1997
Mr. Charles H. Weaver, Jr.
Division of Water Quality/WQ Section
NPDES Group
Post Office Box 29535
Raliegh, North Carolina 27626-0535
RE: GASTON HYDRO STATION - RENEWAL OF NPDES PERMIT
NO. NCG500225, HALIFAX COUNTY
Dear Mr. Weaver:
t0\\��
NORTH CAROLINA POWER
North Carolina Power wishes to renew the subject permit. Pursuant to the January 28, Lo
1997 letter from Mr. David A Goodrich, Supervisor, NPDES Group, the following T
information is provided or enclosed: ao
V
1. This letter constitutes the required letter requesting permit renewal.
2. Gaston Hydro Station does not use or propose to use any chemical additives
such as biocides, corrosion inhibiters, or other water conditioners, to its water or
wastewater systems.
3. The completed signed invoice form is attached.
4. Our processing fee check in the amount of $400 is attached.
Thank you for your consideration and processing of this permit renewal request. If any
questions arise regarding this letter and its attachments, please contact Bob Williams,
Senior Environmental Specialist, Environmental Policy and Compliance Department, at
[phone].
Sincerer
W. White
Director
Environmental Compliance-Water/Waste
RJW/jmh
Attachments
a
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OoTt C4,40C_t"h -" c-E2..d (.- �k'2�M 0,,
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PERMIT NO.: Pie 06-5aH--
�163
NPDES WASTE LOAD ALLOCATION
PERMITTEE NAME: Virginia Electric and Power Company / Gaston
Facility Status: Existing ��
Permit Status: Renewal
Major
Pipe No.: 001
Minor 1
Design Capacity: (0.382)* MGD
Domestic (% of Flow):
Industrial (% of Flow): 100 %
Comments:
* Average from DMR data.
STREAM INDEX: 23412)
RECEIVING STREAM: Roanoke River
Class: WS-III and B
Sub -Basin: 4a-42-07 0 3- o z -0 a
Reference USGS Quad: B27NE, Thelma (please attach)
County: Halifax
Regional Office: Raleigh Regional Office
Previous Exp. Date: 7/31/91 Treatment Plant Class: 0
Classification changes within three miles:
NA
Requested by: Jule Sh nklin Date: 2/13/91
Prepared by: Date: 3 / (T( 41
Reviewed by: S Date: 151 q_
Modeler
Date Rec.
#
Gen
Z 51
(cos
Drainage Area (mil )�Q %AZW Avg. Streamflow (cfs):
7Q10 (cfs) I, So O Winter 7Q10 (cfs) t,o oo 30Q2 (cfs)
Toxicity Limits:IWC u(A % Acute/Chronic
Instream Monitoring:
Upstream k) Location
Downstream /J Location
Effluent
Characteristics
Summer
Winter
BOD5 (mg/1)
NH3-N (mg/1)
D.O. (mg/1)
TSS (mg/1)
F. Col. (/100 ml)
pH (SU)
DI
()TrPD
Comments:

k ROAN gE,
1F <\;
'
LAKE 'GAST_Q1V
sastoa
^l
Da
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e

/�. s� -, 5/' L
FACT SHEET FOR WASTELOAD ALLOCATIONS
Facility Name:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
Stream Classification:
Subbasin:
County:
Regional Office:
Requestor:
Date of Request:
Topo Quad:
VEPCO/Gaston Hydro Station
NCO065323
Industrial
Existing
Renewal
Roanoke River
WSIII-B
63626 - 05oZOe)
Halifax
Raleigh
Jule Shanklin
021391
B 27 NE
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Request #
6054
REuHVED
MAR 1 i 1991
Stream Characteris ica;
USGS #
Date:
Drainage Area:
Summer 7Q10:
Winter 7Q10:
Average Flow:
30Q2:
rn�r,�hrrcimr
REGULATED
1500 cfs
1000 cfs
The process water consists of wastewater from the station drainage sump and unwatering sump.
The drainage sump receives gravity drainage from floor and equipment drains. The unwatering
sump receives water from systems that remove water from equipment areas for maintenance.
Therefore, the existing limits are recommended.
Special Schedule Requirements and additional comments from Reviewers:
Recommended
Reviewed by
Instream
Date: -Z26(g1
Date: Z 2 q
Regional Supervisor; 0 Dater
Permits & Engineering: ?XIDate: 3 z
RETURN TO TECHNICAL SERVICES BY: MAR 2 9 1991

Existing Limi
Wasteflow (MGD):
BODS (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Col. (/100 ml):
pH (SU):
Oil & Grease (mg/1):
TP (mg/1):
TN (mg/1):
Recommended Limits:
Wasteflow (MGD):
BODS (mg/1):
NH3N (mg/1):
DO (mg/1):
TSS (mg/1):
Fecal Col. (/100 ml):
pH (SU):
Oil & Grease (mg/1):
TP (mg/1):
TN (mg/1):
2
CONVENTIONAL PARAMETERS
Monthly Average Min -Max
m
30
Monthly Average Min -Max
30
. •
Limits Changes Due_ To: Parameter(s) Affected
Instream Data
Ammonia Toxicity
Chlorine
Nutrient Sensitive Waters
HQW
New 7Q10 flow data
Special Modeling Studies
New facility information
Other
(explanation of any modifications to past modeling analysis
including new flows, rates, field data, interacting discharges).
(See page 4 for Miscellaneous and special conditions if apply)
Daily Max
W 1,
Daily Max

4
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Miscellaneous information pertinent to the renewal or new permit for this discharge. Include relationship
Basinwide management plan.
INSTREAM MONITORING REQUIREMENTS:
Upstream: Location:
Downstream: Location:
Parameters:
Special Instream monitoring locations or monitoring frequencies:
SPECIAL INSTRUCTIONS OR CONDITIONS
The permit should require an annual priority pollutant analysis.
The permit should contain a reopener to allow to include other permit limitations contingent results of the
priority pollutant analyses.
WASTELOAD SENT TO EPA?(Major) (Y or N)
(if yes, then attach schematic, toxics spreadsheet, copy of model, or
if not modeled, then old assumptions that were made, and description
of how fits into basinwide plan)
Additional Information attached? (yes or no) If yes, explain attachments. No

WLA Notes
VEPCO-Gaston Hydro Station
2-27-91
- This is a renewal of an NPDES permit for an existing facility that dis-
charges wastewater from the hydro station drainage sump and unwatering sum. I did
compliance inspection to this facility about four years ago. The water discharge
consists of water accumulated from the operation of the turbines and other
appurtenances. The oil and grease content of the wastewater is from the lubrica-
tion needed to maintain the equipment. However, I am requesting that an annual
pollutant analysis be performed at this facility only to have good information on
the constituents of the discharge. Therefore, I am recommending that the permit
contains a reopener to allow the incorporation of additional limitations if
required through the information provided by the APPA. Besides this new require-
ment I am recommending the existing permit limitations.

5000 Dominion Bocrk� crrd
lllc)4 Virginia 23060
t3
VIRGINIA POWER
January 18 , '1991
Mr. M. Dale Overcash, P.E.
Permits and Engineering Unit
Division of Environmental Management
P. O. Box 27687
Raleigh, NC 27611-7687
RE: MOTON MMW S=CN - NPDE.S PMKET W. N00065323
APPLICATICK FOR PELT RENEWRL W-UnD 14DDIFICATICN
Dear Mr. overcash:
Pursuant to the instructions in your October 19, 1990 letter, we are pleased to
submit a signed original application, along with three copies, for renewal of
the subject permit. Since the issuance of our current permit on August 20, 1986,
the wastewater treatment and discharge systems at the station have not been
modified. Consequently, we request renewal of our permit without modification.
The attached application includes an Appendix containing additional information
and our check for $250.00 for processing an application for permit renewal
without modification.
We would be happy to provide you with any additional information including
detailed drawings and invite you to visit the station at any time. If you have
any specific questions regarding this application or our operations, please
contact Bob Williams of my staff at [phone].
sincerely.,
-J&kap 1p
B. M. Marshall, P.E.
Manager
Water Quality

�.�.-.--gin •: TO JANEMPY,i• n PEMaT APPLICATIM
H• • •N H)MRO . V• •I HALUM COUNZY
PERM •NCO065323
Item 1. The powerhouse is located on the Roanoke River approximately 8 miles
upstream from our Roanoke Rapids hydro Station between Halifax and
Nordtampton Counties. The mailing address provided is the office
of our corporate staff. The location address provided is the
location and local mailing address for the Roanoke Rapids Hydro
Station which operates the Gaston Hydro Station. Geographically,
the Gaston Hydro Station is in Halifax County near the community of
Thelma, North Carolina.
Item 3. The Gaston Hydro Station is an automated facility that is maintained
and operated by the Roanoke Rapids Hydro Station. The Roanoke Rapids
Hydro Station has 33 employees.
Item 10. The flaw data provided do not include the discharge of turbine water
(head water which passes across the hydroelectric turbine blades and
discharges as tailwater).
Item 10.A. No sanitary waste water is discharged to surface water. The
station's sanitary wastes are pined to a septic tank and
nearby drain field.
Item 10.B. Cooling water flaw consists of raw intake water that provides
non -contact cooling for the oil cooling coils of the generator
thrust bearing, the generator air coolers, the turbine bearing
oil heat exchanger, and the control room air conditioning unit.
This flaw is routed into the draft tubes which are the in -
plant turbine water conduits. The maximum cooling water flaw
a 0 Z into the draft tubes and ultimately into the tail race is 4,360
glan. Cooling water flow is not measured due to physical
constraints and location of the cooling water pipes.
Additionally, no impact to receiving waters have been observed
or is anticipated due to the discharge of cooling water. From
M data for the period December, 1989 through November, 1990,
temperature of tail race water (downstream) was higher than
raw intake water (upstream) during only one month (December,
1989) . The tailrace water temperature was equal to or less than
the raw intake water temperature during the remaining months.
Item 10.C. Process water flow consists of waste water from the station's
drainage sump and unwatering sum. The drainage sump receives
gravity drainage from floor, trench, and equipment drains in
the powerhouse and service bay. The drainage sump is equipped
with two vertical shaft deep well turbine pumps that discharge
D b through a common 20-inch header pipe to tail water below the
minimum tail water elevation. These pumps are each rated at
300 gpm capacity and normally operate on a level actuated
automatic mode.
The unwatering sump receives water from the several systems
o4*

Y
that remove water from equipment area for maintenance and
inspection purposes. The unwatering sump is equipped with two
vertical shaft deep well turbine pumps that discharge through
the common 20-inch header pipe to the tail race below the
minimum tail water elevation. These pumps are rated at 5,000
gpm capacity and, because of their less frequent use, are
manually actuated. Unwatering operations are typically on an
as -needed basis.
Each of the drainage and unwatering pumps is equipped with a
pump -run timer for determining monthly totalized flaw values.
Additionally, the 20-inch common header (discharge) pipe is
equipped with a sample tap. From DMR data for the period
December, 1989 through November, 1990, discharge flaw averaged
0.382 mgd.
The drainage sump pumps have inlets below the minimum water
level in the sump. consequently, the sump provides some
treatment capacity for oil and grease separation. No data is
available regarding the percentage of the volume treated before
discharging to surface waters.
Item 11. Refer to comments on Item 10.A. Sanitary waste water flow is not
metered. The septic tank has a capacity of 500 gallons. Due to the
infrequent use of the system, daily average flow is estimated to be
25 gallons per day.
Item 12. There are two separate discharge points exclusive of roof and deck
drains, dam contraction joint drains, foundation drains and the non -
contact cooling water discharges into the draft tube. One discharge
IS the 20-inch common header from the drainage and unwatering sump
pumps. The other discharge is a six-inch line from the automatic
raw (intake) water strainers which is connected to the roof drainage
system that discharges into the tailrace.
Item 14. To the best of our knowledge, none of the substances listed on the
application form are purposely added to any of the discharges as a
result of our operations, activities, or processes. However, oil
and grease occurs in small quantities in the station's drainage sump
discharge and possibly the unwatering sump and turbine water
discharges. Any oil and grease detected in these discharges would
be incidental and would not be specifically added. From MIR data
for the period December, 1989 through November, 1990, oil and grease
concentrations in the process water discharges averaged <7.6 mg/l.
t4o

� � f
44b
NORTH CAROLINA DEPT. OF NATURAL RESOURCES AND COMMUNITY DEVELOPMENT'
DIVISION OF ENVIRONMENTAL MANAGEMENT, P.O. BOX 276879 RALEIGH, NC 27611
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
APPLICATION FOR PERMIT TO DISCHARGE — SHORT FORM C FORff
ICATION NUMBER AGENCY
USEATE RECEIVED
To be filed only by persons engaged in manufacturing and mining
o > I
Zz
YEAR MO.-- DAY
Do not attempt to complete this form before reading actompan in ��-Y 9 instructions $ate.
Please print or type
1. Name, address, location, and telephone number of facility producing discharge
A. Name Gaston Hydro Station
B. Mailing address
1. Street address Water Quality Department, 5000 Dominion Blvd.
2. City Glen Allen 3. State VA
4. County s, Zip 23060 C. Location:
1. Street North end of Oakwood Ave.,, P.O. Box 370
2. City Roanoke Rapids
3. County
4. State NC
D. Telephone No. 91_ 9� ` 535-6170
Area
Code
2. SIC
(Leave blank)
3. Number of employees
33
If all your waste is discharged into a publicly owned waste treatment facility
and to the best of your knowledge you are not required to obtain a discharge
permit, proceed to item 4. Otherwise proceed directly to item 5.
4. If you meet the condition stated above, check here o and supply the information
asked for below. After completing these items, please complete the date, title,
and signature blocks below and return this form to the proper reviewing office
without completing the remainder of the form.
A. Name of organization responsible for receiving waste
B. Facility receiving waste:
-1. Name
2. Street address
3. City 4. County
S. State 6. ZIP
5. o Principal product, o raw material (Check one) electricity
'6. Principal process Hydroelectric generation of electricity
1. Maximum amount of principal product produced or raw material consumed per (Check one) The m.21im>am rated
ca achy is 225 MW.
Basis 1-99
(1)
100-199
(2)
200-499
(3j
500-999
(4)
1000- 5000- 10,000- 50,00C
4999 9999 49.999 or mor
(5) (6) (7) (A)
A. ()ay
H. Month
x
C. Year

ft. MAX tn. ,m mm�unl 'Ifprinr 11, 1 pr udml pr udw rd nr row xAI,•rI"I uurdmx•,1, rrpnr l.•d
In ILtm /, above, is mess urtrd In (UicLk unul:
A.o pounds 8.0 tons C.0 barrels 0.0 bushels E.a square feet
F.o gallons G.o pieces or units N.00ther, specify - meoawatts
9. (a) Check here if discharge occurs all year o , or
ib) Cheek the month(S) discharge orrurs:
1.13 January 2. o februar, 3, 0 Marcn 4.0 Apri l 5.0 May 6.o June
7.0 July R.0 August +.0 Septemher 10.0 October II.a November 12.0 December
(c) Check how many days per weer. 1.01 2.02-3 3.04-5 4.016-7
10. Types of waste water discharged t- surface waters only
(check as applicable)
Uischarge per
operating day
A. Sartit:ry, Bail^
a verape
too nnq water, etc.
daily average
Process water,
daily averaoe
Maximum p�raC-
ino da f
F low. gallons per operating day
0.1_999 1000-4999 1 5000-9999 1 10,000-
49,999
(1) (2) (3) (4)
volume treated before
discharging (percent)
50,000- None 0.116489
30_ 65- 95-
or more 29..94.9 100(7() (9) (10)
Y or total I
_ discharge (all r tvs)l I I I X1 lSee appendix for additions
11, If am r� the three types of waste ident.f+ explanation.
are n% har t Identified in 'te, ID.either treated or untreated,
C
oed to u ace; other than surface water,., check below as applicable.
waste water is
Average flow, gallons per
operating day
disChnrgrd to: 0.1-999
1000-4999 5000-9999
10 000-49 999
50,000 or
(2) (3)
more
4. Municipal Br system
(4)
(5)
0. Undergrountl ,ell
r- Seott, tan,
x
D. Evaooration iagnnn rr pdntl
E. other, spec it,
12. Number of separate distna rge points: A.0 I Bm 2-3 C.0 4-5 D.0 6 or more
13. Name of ,-eceivjf;9 water or waters Roanoke Rapids Lake
14. Does your discharge contain or is it possible for your discharge to contain
one or more of the following substances added as a result of your operations,
activities, or processes: ammonia, cyanide, aluminum, beryllium, cadmium,
chromium, copper, lead, mercury, nickel, selenium, zinc, phenols, oil and
grease, and chlorine (residual). A.®yes 8.0 no 1
I
See appendix for certify that 1 am familiar with the information contained in the application and additional explanation.
that to the best of my knowledge and belief such information is true, complete, and
accurate.
W.R. Cartwrigh
Printed Name of P rs Vice-Presid gt
/ SI " Title
Date Application Signed X
f Applicant
North Carolina General Statute 143-215.6(b)(2 Srovidesothat: Any perso
any false statement reprywho knowingly makes
esentation, or certification in an a licationn 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--knowly renders inaccurate any recording or monitoring device or method required to be
operated_or maintained" -under Article 21 or regulations of the Environmental Management Cottlmissi
implementing that Article, shall be guilty of a misdemeanor pumishable by a fine not to exceed
$10,000, or by -imprisonment not to exceed six months, or by both. (18 U.S.C. Section 1001
a punishment by a fine of nor more than $10,000 or imprisonment not more rhan s _
for provir

t.
e
(5/90)
To: Permits and Engineering Unit
Water Quality Section
DATE: aC ".25-
NPDES STAFF REPORT W RECOMMENDATION
COUNTY: "Fa
PERMIT No .: NC .�� 3 3«ne4jal
i�
PART I -- GE2.0 RA.L INFORMATION
1_ Facility and Address:
2_ Date of Investigation:
3. Report Prepared B l :
�,��1e
4. Persons Contacted & Telephone No_:
i tih�►hti �jor�Ps'�l.3 6-' 6 l 70
Y
5. Directions to Site:
5/2, 1100 00 LJe5t of G"AO& Aomw,
Q.flt on 5R-141q - lrlt, f f,, ckt 1s access
rwc%ok 4t-;� 91ale
6. Discharge Point(s), List for all discharge points:
Latitude: 3 0 0 9' 304
Longitude: 77 0 V 7" 3 0i/
Attach a U.S.G.S. map extract and indicate treatment
facility site and discharge point on map.
U.S.G.S. Quad No . 71VeU . S . G . S _ Quad Name %!'���/YIa
7_ Size (land available for expansion and upgrading):
N/#
8. Topography (relationship to flood plain
included): n`A
34i

Staff Report and Recommendation
Page -2-
9. Location of nearest dwelling:
. y
tea / 'hati t n1i�e
10. Receiving stream or affected surface waters:
Roano% AIV4-
a. Classification: bv5 ---tZ 4 6
b. River Basin and Subbasin No.: 03 Da-08 �oaao�e�,UcrB4s 1�
C. Describe receiving stream features and pertinent
downstream uses: Ofiar CUOIIv WJA*' 01i3CA4ar -Is
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Type of wastewater, sludge or contaminated soil:
% Domestic
0 0 % Industrial
a. volume of Wastewater: �•� MGD
(Design Capacity)
b. Types and quantities of industrial wastewater:
fion- Gonfr-&t C-0011 n, L04A,-
c. Prevalent toxic constituentA in wastewater:
no -A e
d. Pretreatment Program (POTWs only) /X%1,/9
in development approved
should be required not needed
2. Production rates (industrial discharges only) in
pounds per day:
a. Highest month in the past 12 months: lbs/day
b. Highest year in the past 5 years: lbs/day
3. Description of industrial process (for industries only)
and applicable CFR Part and Subpart:
g2.�nera�'bn of e��cfi^rU��y �ron. /fyQ�v �B'^'Pi'
4. Type of treatment (specify whether proposed or existing):
none cel-1«iyed
5_ Sludge handling and disposal scheme:
RDh�

Staff Report and Recommendation
Page - 3 --
6. Treatment plant classification: Less than 5 points; no
rating (include rating sheet, if appropriate):
7. SIC Codes) : /)jA
Wastewater Code(s): Primary � �Secondary
PART III -- OTHER PERTINENT INFORMATION
1. Is: this facility being constructed with Construction
Grdnts Funds (municipals only)?
2. Special monitoring requests:
3. Additdnal effluent limits requests:
4. Other_

w M
1 `
` Staff Report and Recommendation
Page -4-
PART IV -EVALUATION AND RECONIISLNDATIONS
�6i2 �i�0 RC15 !ZD U' � I ���Ike
ignature of"Report Preparer
0--� _ .%
Regfonal Water Quality Supervisor
�s�sl
Date
TLD: :bas

Grp■
RECEIVED
APR 2 2 1992
TECHNICAL SUPPORT BRANCH
State of North Carolina
-- Department of Environment, Health, and Natural Resources .
Division of Environmental Management
512 North Salisbury Stmet • Raleigh, North Carolina 27604
James G. Martin, Governor George T. Everett, PhD
William W. Cobey, Jr., Secretary
April 16, 1992
B. M. Marshall, Mgr., Water Quality
Attn. Bob Williams
5000 Dominion Blvd. - WQ Dept.
Glen Allen, VA 23060
Subject: NPDES Permit Modification
NPDES Permit No. NCO065323
VEPCO-Gaston Hydro Station
Halifax County
Dear Mr. Marshall:
Director
On April 1, 1992, the Division of Environmental Management issued NPDES Permit No.
NCO065323 to your company. A review of our file has indicated that a requested monitoring
change from normal was inadvertently left out of the permit. Accordingly, we are forwarding
herewith modifications to the subject permit to correct the error. This permit modification consists
of restoring the monthly monitoring frequency to Outfall 002.
Please find an enclosed amended "EFFLUENT LIMITATION AND MONITORING..."
r_ page which should be inserted into your permit. The old page(s) should be discarded. All other
terms and conditions contained in the original permit remain unchanged and in full effect. These
permit modifications are issued pursuant to the requirements of North Carolina General Statutes
143-215.1 and the Memorandum of Agreement between North Carolina and the U. S.
Environmental Protection Agency. This permit modification becomes effective immediately.
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within
thirty (30) days following receipt of this letter. this request must be in the form of a written
petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the
Office of Administrative Hearings, Post Office Drawer 27447, Raleigh, North Carolina
27611-7447. Unless such demand is made, this decision shall be final and binding.
Continued...
Pollution Prevention Pays
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

B. M Marshall, Page 2
If you have any questions concerning these permit modifications, please contact Mr. Jule
Shanklin at telephone number 919/733-5083.
cc. Mr. Jim Patrick, EPA
Raleigh Regional Office
Compliance Group
Central Files
Technical Support Branch
Enclosure

i
A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NCO065323 "
During the period beginning on the effective date of the: permit and lasting until expiration, the Permittee is authorized to discharge from
outfall(s) serial number 001; DRAINAGE SUMP AND DEWATERING SUMP. Such discharges shall be limited and monitored by the
permittee as specified below: '
Effluent Characteristics Discharge Llmitatlons Monitoring Requirements
Units (speclfy) Measurement Sample
Mon. Avg. Daily Max Mon. Avg. Dally Max Frequency Type Location
Flow Monthly Pump Logs E
Oil and Grease 30.0 mg/l 60.0 mg/l Monthly Grab E
Temperature Monthly Grab E
* Sample locations: E - Effluent
** The temperature of the effluent shall be such as not to cause an increase in the temperature of the receiving stream of more than 2.8°C and in
no case cause the ambient water temperature to exceed 32°C.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored Monthly at the effluent by grab
sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NCO065323 "
During the period beginning on the effective date of the: permit and lasting until expiration, the Permittee is authorized to discharge from
outfall(s) serial number 001; DRAINAGE SUMP AND DEWATERING SUMP. Such discharges shall be limited and monitored by the
permittee as specified below: '
Effluent Characteristics Discharge Llmitatlons Monitoring Requirements
Units (speclfy) Measurement Sample
Mon. Avg. Daily Max Mon. Avg. Dally Max Frequency Type Location
Flow Monthly Pump Logs E
Oil and Grease 30.0 mg/l 60.0 mg/l Monthly Grab E
Temperature Monthly Grab E
* Sample locations: E - Effluent
** The temperature of the effluent shall be such as not to cause an increase in the temperature of the receiving stream of more than 2.8°C and in
no case cause the ambient water temperature to exceed 32°C.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored Monthly at the effluent by grab
sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

n
:I
to
NPDES WASTE LOAD ALLOCATION
Facility Name:
��EiAMME
-YM-
Date
Existing O
Proposed @ Permit Pb.: IVcoo (p S 3 L3 Pipe No.: 0 O 1 County: N� 14L)<
Design Capacity (MGD)) : b .O S0 Industrial (% of Flow) : ( 0 b S�MPIbmestic (% of Flow) : O
Receiving Stream: R oa,�l� Qa.d La(�, Class: WSW °� l7 Sub -Basin: 03 OZ at
7
Reference USGS Quad: (Please attach) Requestor: Lssa Cre4ez a Regional Office R A o
(Guideline limitations, if applicable, are to be listed on the back of this form.)
Design Ttmp.:
7Q10 (cfs)
Drainage Area (mi2):
Avg. Streamf low (cfs):
Winter 7Q10 (cfs) 30Q2 (cfs)
Location of D.O. minimum (miles below outfall):
Velocity (fps):
Slope (fpm ).
K1 (base o, per day): K2 (base e. Der day).
Effluent
Characteristics
Monthly
Average
Comments
x
_q
k &Maze-3o
m 1-.
-Olt
c er
I e_ a
not ca.u's
a. 2aC_ to0ve
n welf rL�
3a °c
Orl Thal Allocation O Comments:
vised Allocation O
Confirmation
Prepared By: \ Reviewed
L-8Y
Effluent
Characteristics
1_�_g_e
Comments
0 Ganus
6
e. recerve,2
WalelS
n
e vie
i-A no ca
s '6e ex ee
By: Date:

? t .
r
i•, a
For Bpopriate . Dischargers, List Complete Guideline Limitations Belau
Effluent
Characteristics
Nbnthly
Average
Maximum Daily
-Aversage '
Gbmments
•
SS h
30- 0 1�--
o 0 • o •� /�
Ck WMAzd
0
O.r/ y�-a�
t S- o M /L
Za. o n, C.4A
c cah
S orvana se
Type of Product Produced
Lbs/Day Produced
ftfluent -Guideline Reference,
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2 @ 4,053 GALLONS EACH
AUTOMATIC GREASERS: 4 @ 55 GALLONS EACH.
MAX 10 DRUMS @ 55 GALLONS EACH
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EQUIPMENT LUBE AND GEAR OIL
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