NCG500582_Permit (Issuance)_20070723

ATA
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
Terry Syverson
Southern Power Company
5755 NC Highway 801
Salisbury, NC 28147
Subject: Renewal of coverage / General Permit NCG500000
Rowan County Plant
Certificate of Coverage NCG500582
Rowan County
Dear Permittee:
In accordance with your renewal application [received on February 5, 2007], the Division is renewing
Certificate of Coverage (CoC) NCG500582 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 Mooresville 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,
for Coleen H. Sullins
cc: Central Files
Mooresville Regional Office / Surface Water Protection
NPDES file
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
512 North Salisbury Street, Raleigh, North Carolina 27604
Phone: [phone] / FAX [phone] / Internet: www.ncwaterquality.org
An Equal Opportunity/Affirmative Action Employer— 50% Recycled/10% Post Consumer Paper
One
North Carolina
Naturally

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
GENERAL PERMIT NCG500000
CERTIFICATE OF COVERAGE NCG500582
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,
Southern Power Company
is hereby authorized to discharge from a facility located at
Rowan County Plant
5755 NC Hwy 801
Salisbury
Rowan County
to receiving waters designated as Second Creek in subbasin 30704 of the Yadkin 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.
AL, ‘.7 4Jzif,,,
for Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission

To: Permits and Engineering Unit
Water Quality Section
Attention: Charles Weaver
SOC PRIORITY PROJEC2- -'-Nft--
Date: June 8, 2007
J IJ N 1 ' 2007
NPDES STAFF REPORT AND RECOMMENDATIONS
County: Rowan
NPDES Permit No.: NCG500582
PART I - GENERAL INFORMATION
DENR - WATER ef:.,,_ny
POINT SOL;:;E
1. Facility and address: Southern Power Company (formally Rowan County Power, LLC)
5755 NC Hwy. 801
Salisbury, N.C. 28144
2. Date of investigation: June 6, 2007
3. Report prepared by: Michael L. Parker, Environmental Engineer II
4. Person contacted and telephone number: John Cheek, Scott Dial, [phone]
5. Directions to site: From the jct. of US Hwy. 70 and NC Hwy. 801 in western Rowan
County, travel north on NC Hwy. 801.1.0 mile. The entrance to the site is on the right
(east) side of Hwy 801.
6. Discharge point(s), list for all discharge points: -
outfall 001 outfall 002
Latitude: 35 ° 43' 55" Latitude: 35 ° 43' 18"
Longitude: 80° 35' 55" Longitude: 80° 35' 27"
Attach a USGS Map Extract and indicate treatment plant site and discharge point on map.
USGS Quad No.: E 16 NE
7. Site size and expansion area consistent with application: Yes. There is ample room for
WWTP construction, if necessary.
8. Topography (relationship to flood plain included): The site is gently rolling with slopes
ranging from 3-12%. The plant site is not located in a flood plain.
9. Location of nearest dwelling: Approx. 500+ feet from the plant site.

Page Two
10. Receiving stream or affected surface waters: UT to North Second Creek — outfall 001;
North Second Creek - outfall 002
a. Classification: C (both outfalls)
b. River Basin and Subbasin No.: Yadkin 030706
c. Describe receiving stream features and pertinent downstream uses: The area both
upstream and downstream is generally rural in nature with agriculture being the
primary use, however, there is one large industrial discharger 2/3 mile upstream
(Kosa - NC0004944).
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
Outfall 001 Outfall 002
1. a. Volume of Wastewater: 0.240 MGD 250 GPD
b. What is the current permitted capacity: There is no capacity listed in the permit.
c. Actual treatment capacity of current facility (current design capacity): N/A
d. Date(s) and construction activities allowed by previous ATCs issued in the
previous two years: There have been no ATCs issued in the past two years.
e. Description of existing or substantially constructed WWT facilities: The applicant
operates dechlorination facilities to remove TRC prior to discharge.
f. Description of proposed WWT facilities: The applicant does not propose any
additional WWT facilities at this time. The discharge consists of non -contact
cooling water from existing cooling towers.
g•
Possible toxic impacts to surface waters: Toxic impacts are possible with
biocides, corrosion inhibitors, chlorine, and algaecides added to the waste stream.
2. Residual handling and utilization/disposal scheme: There are no residuals generated at
this facility.
3. Treatment Plant Classification: N/A
4. SIC Code(s): 4911 Wastewater Code(s): 14 MTU Code(s): N/A
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant Funds or are any public monies
involved? No. Public monies are not being used in the construction of this facility.
2. Special monitoring or limitations (including toxicity) requests: None pending approval
by the Toxicity Unit of the chemical additives included in this COC renewal request.

Page Three
3. Important SOC/JOC or Compliance Schedule dates: This facility is neither under an
SOC nor is one being considered at this time.
4. Alternative Analysis Evaluation
a. Spray Irrigation: Insufficient area, shallow soils.
b. Connect to regional sewer system: There is a package WWTP within the service
area of this proposed facility, however, an expansion of this plant would be
necessary before it could accept the existing waste stream. Also the cooling water
may be detrimental to the operation of the WWTP since the cooling water waste
stream would dominate the plant's influent resulting in an unfavorable F/M ratio.
c. Subsurface: Insufficient area, shallow soils.
d. Other disposal options: None that we are aware.
PART IV - EVALUATION AND RECOMMENDATIONS
Southern Power Company currently operates a combustion turbine electrical generation
facility in western Rowan County. A COC has been issued for this facility (NCG500582) for the
discharge of wastewater from an evaporative cooling process for the combustion turbines. All
domestic wastewater is disposed of on -site via subsurface disposal permitted through the
Division of Environmental Health. Other wastewater sources that may have pollutants (such as
oil/grease) are collected for disposal and then hauled off -site to a waste oil reclamation facility.
Pending a technical review and approval of the renewal application and supporting
information submitted with this request, it is recommended that the COC be reissued as
requested.
w
Signature of Report Preparer
7
Date
eC____ 4,44,
Date
Water Quaky )j ional Supervisor
hAdsr1/41st07\soouthernpwr.dsr

ATA
NCDENR
J
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): NCG500 582
(Please print or type)
1) Mailing address* of facility owner/operator:
Company Name Southern Power Company
Owner Name Southern Company
Street Address 5755 NC 801 HWY
City Salisbury State NC ZIP Code 28147
Telephone Number 704-278-6603 Fax: [phone]
Email address [e-mail]
* Address to which all permit correspondence should be mailed
2) Location of facility producing discharge:
Facility Name Plant Rowan County
Facility Contact Terry Syverson
Street Address 5755 NC 801 HWY
City Salisbury State NC ZIP Code 28147
County Rowan County
Telephone Number 704-278-6603 Fax: [phone]
Email address [e-mail]
3) Description of Discharge: *See Cover Letter
a) Is the discharge directly to the receiving stream? • 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):
Two (2)
c) What type of wastewater is discharged? Indicate which discharge points, if more than one.
• Non -contact cooling water Outfall(s) #: 002
• Boiler Blowdown Outfall (s) #: 002
Page 1 of 3

NCG500000 renewal application
• Cooling Tower Blowdown
• Condensate
• Other
Outfall (s) #: 002
Outfall (s) #: 002
Outfall (s) #: 001 and 002
(Please describe "Other") See Cover Letter
d) Volume of discharge per each discharge point (in GPD):
#001: 250 #002: 240.000 (max) #003: #004
4) Please check the type of chemical [s] added to the wastewater for treatment, per each separate discharge
point (if applicable, use separate sheet): See Cover Letter
• Chlorine
0 None
• Biocides • Corrosion inhibitors
■ Algaecide ❑ Other
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: See
Cover Letter
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 0 No See Cover Letter
(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: See Cover Letter
The discharge is: 0 Continuous • Intermittent ❑ Seasonal*
i) If the discharge is intermittent, describe when the discharge will occur:
During cooling tower blowdown activities
ii) *Check the month(s) the discharge occurs: 0 Jan ❑ Feb ❑ Mar. ❑ Apr 0 May El Jun 0 Jul
0 Aug. 0 Sept. 0 Oct. 0 Nov. 0 Dec.
b) How many days per week is there a discharge?
c) Please check the days discharge occurs: 0 Sat. ❑ Sun. 0 Mon. 0 Tue. 0 Wed. 0 Thu. 0 Fri.
8) Receiving stream
a) To what body or bodies of water (creek, stream, river, lake, etc.) does the facility discharge
wastewater? North Second Creek
b) Stream Classification: Fresh Water — Class C
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: ---?\obec' N. R. C\Gr e J'f •
Title: \ roye C r r g ce C
\,.).,n-47._ 9i. Oz/di%D
(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.)
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This Notice of Renewal Intent does NOT require a separate fee.
The permitted facility already pays an annual fee for coverage under NCG500000.
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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

ENSR
AECOM
ENSR
4701 Cox Road, Suite 200, Glen Allen, VA 23060
T 804-290-7920 F 804-290-7921 www.ensr.aecom.com
February 1, 2007
Mr. Charles H. Weaver, Jr.
NC DENR / DWQ / NPDES
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Subject: Notice of Renewal Intent Application
General Permit NCG500000
Existing Certificate of Coverage NCG500582
Dear Mr. Weaver:
On behalf of Southern Power Company, ENSR is pleased to submit this Notice of Renewal Intent
Application for General Permit NCG500000, Existing Certificate of Coverage NCG500582 for the Plant
Rowan County power station. The current permit became effective on August 1, 2002 and will expire at
midnight on July 31, 2007. The Plant Rowan County power station is located at 5755 NC HWY 801,
Salisbury, NC 28147 and includes simple -cycle natural gas combustion turbines, combined cycle combustion
turbines, switch, and substation yards containing the necessary supporting equipment and systems needed
for operation. Specifically, the station contains five combustion turbine units, one steam turbine unit and
cooling towers with associated water treatment chemicals.
The following provides additional information as referenced by item number in Attachment 1 - January 31,
2007 Notice of Renewal Intent:
1. Item 3(a) — Description of Discharge
1. Outfall 001 discharges from a storm water retention pond to an unnamed tributary of North
Second Creek. See Attachment 2 — Site Map.
2. Outfall 002 discharges directly to North Second Creek.
2. Item 3(c) Other — Description of Discharge
Outfall 001
1. Storm water which accumulates in an outdoor retention pond located adjacent to the cooling
towers and chemical storage areas. See Attachment 2 — Site Map.
2. Wastewater from operational systems during infrequent draining of various process units,
piping, components and storage tanks during maintenance and operational activities (i.e.
circulation water, steam drain blowdown, hotwell, gland seal, heat -recovery steam generator
(HRSG), and demineralized water). See Attachment 3 —April 26 and June 18, 2004
correspondence.
Outfall 002
1. Non -contact cooling water.
2. Water conditioning products (i.e. Corrshield MD4100, Propylene Glycol, Sodium Hypochlorite,
Continuum AEC3108 and Spectrus DT 1404).
3. Wastewater from operational systems during infrequent draining of various process units,
piping, components and storage tanks during maintenance and operational activities (i.e.
circulation water, steam drain blowdown, hotwell, gland seal, HRSG, and demineralized
water). See Attachment 3 —April 26 and June 18, 2004 correspondence.
4. Blowdown wastewaters (cooling tower and boiler).

Mr. Charles H. Weaver, Jr.
February 1, 2007
Page 2
3. Items 4 and 5 — Corrosion Inhibitors
See Attachment 3 for correspondence from Plant Rowan County to the North Carolina
Department of Natural Resources, Division of Water Quality (NC DENR DWQ) regarding the
approval for use of specific corrosion inhibitors (i.e. Corrshield MD4100 and Propylene Glycol).
The facility also uses Sodium Hypochlorite and Continuum AEC3108 as water conditioning
products in addition to Spectrus DT 1404 (sodium bisulfite) to eliminate residual chlorine. MSDS
sheets for Sodium Hypochlorite, Continuum AEC3108 and Spectrus DT 1404 are included in
Attachment 4. In addition, completed Biocide 101 Forms and MSDS sheets will be submitted to
the Aquatic Toxicology Unit for Sodium Hypochlorite, Continuum AEC3108 and Spectrus DT 1404.
4. Item 6 — Wastewater Treatment
Outfall 001 — A storm water retention pond is located adjacent to the cooling towers. The pond
collects surface water runoff from the area surrounding the cooling towers and water chemical
storage areas. Due to potential impacts from the adjacent cooling towers and chemical storage
areas to storm water located within the pond, the discharge is monitored under this waste water
permit. The pond is specifically designed to provide storm water retention capabilities and not
serve as wastewater treatment. The pond has an overflow discharge pipe which discharges to an
unnamed tributary of North Second Creek.
Outfall 002 — Wastewater treatment associated with Outfall 002 is limited to the use of sodium
bisulfite for the elimination of chlorine.
5. Item 7 — Discharge Frequency
The discharge for 001 is intermittent depending on the amount of rainfall. Historically the pond
will discharge a small amount of water (less than 25 gallons per day) during normal conditions.
The pond will discharge more water (approximately 250 gallon a day) during heavy rain events.
The discharge for 002 which is continuous during intermittent plant operations ranges from
150,000 gallons per day under normal conditions up to 240,000 gallons per day during full plant
operation (24 hours a day 7 days a week). The plant typically does not operate every day due to
limitation imposed by the air permit (i.e. 2,000 hours per year for each turbine).
Please feel free to contact either Mr. Hare at 804-516-9551 or Mr. Syverson at 704-450-9862 if you have
any questions about this letter.
Sincerely yours,
7cruriA
Robert Hare
Project Manager
[e-mail]
Cc: Terry Syverson — Plant Rowan County
Laura Rose
Senior Project Manager
([e-mail]
Attachments: Attachment 1 — January 31, 2007 Notice of Renewal Intent
Attachment 2 — Site Map
Attachment 3 — Agency Correspondence
Attachment 4 — MSDS Sheets
Attachment 5 — Authorization for Representatives
ENSR
AECOM

Site Boundary
Cooling Tower
Outfall 002
( Sampling Point )
ENSR
AECC
ENSR CONSULTING AND ENGINEERING (NC), INC.
RALEIGH, NORTH CAROUNA 27616
PHONE: [phone]
FAX: [phone]
WEB: HTTP://WWW.ENSRAECOM.COM
USGS 7-1/2 MINUTE SERIES MAP
Rowan Mills, NC
1987
TOPOGRAPHIC QUADRANGLE
SCALE 1:24000
752
Property
Boundary
Storm Water Pond
Outfall 001
Outfall 002
( Underground
Discharge Pipe )
Outfall 002
( Temperature
Sampling Point )
Topographic Site Map
Plant Rowan County
5755 Highway 801
Salisbury
Rowan County, North Carolina
FIGURE NUMBER:
1
DRAWN BY: DATE: PROJECT NUMBER
KLR 11/26/07 06204-018
:
DRAWING NUMBER:
A60644A

Southern Company Services, inc.
5755 NC RO1 Hwy.
Salisbury, North Caroline 20147
Robert P Hare
Project Manager
ENSR
4701 Cox Road, Suite 200
Glenn Allen, Virginia 23060
Mr. Hare,
Please sign for me, the Plant Rowan NPDES
timely application and meeting the deadline.
correspondence if needed. Thanks for your c
Regards,
'"`7
B.
Terry D. Syverson
Compliance Team Leader
Plant Rowan
Southern Power Company
5755 NC 801 Hwy
Salisbury, NC 28147
SOUTHER
COMPANY
Ene;gy to Serve Your W7nrlr
January 30, 2007
Permit Application so not to delay the
1 will be available for any future
°operation.