NCG500582_Permit (Issuance)_20160422

Weaver, Charles
From: Weaver, Charles
Sent: Friday, April 22, 2016 10:58 AM
To: '[e-mail]'
Cc: '[e-mail]'
Subject: renewal of NCG500582
Attachments: Technical Bulletin - NCG500000 2015.doc; NCG50 Final 093015.pdf
Importance: High
Attached you will find the updated version of NPDES General Permit NCG500000, effective 10/1/2015. Discard any
previous versions of the General Permit and use this version until further notice.
You do not need a reprinted Certificate of Coverage, as the one issued to you in 2007 is still applicable.
Thank you for your patience during the longer -than -expected renewal period.
If you have any questions about this matter, simply reply to this message.
Charles H. Weaver
Environmental Specialist
N.C. Division of Water Resources
N.C. Department of Environmental Quality
919-807-6391
[e-mail]
(physical address) 512 North Salisbury Street, Raleigh, NC 27604
(mailing address) 1617 Mail Service Center, Raleigh, NC 27699-1617
Nothing Compares.
Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed
to third parties.
1

Weaver, Charles
From: Microsoft Outlook
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Sent: Friday, April 22, 2016 10:59 AM
Subject: Relayed: renewal of NCG500582
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destination server:
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cstarks©southernco.com ([e-mail])
Subject: renewal of NCG500582
l
renewal of
NCG500582
1

Southern Power
600 North 1 Bin Street
Birmingham. Alabama 35203-2206
205-257-2647
March 16, 2012
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:
SOUTHERN
COMPANY
E@NoeER
MAR 1 s 2012
LDENR WATER QUALITY
POINT SOURCE BRANCH
Southern Power Company is pleased to submit this Notice of Renewal Intent Application for General
Permit NCG500000, Existing Certificate Coverage NCG500582 for the Plant Rowan County power
station. The current permit became effective on August 1, 2007 and will expire at midnight on July 31,
2012. The Plant Rowan County power station is located at 5755 NC HWY 801, Salisbury, NC 28147 and
includes three simple -cycle combustion turbines, two 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 tower
with associated water treatment chemicals.
The following provides additional information as referenced by number in Attachment 1 — Notice of
Renewal Intent:
1.
Item 3(a) — Description of Discharge
a. Outfall 001 discharges from a storm water retention pond to an unnamed tributary of Second
Creek. See Attachment 2 — Site Map
b. Outfall 002 discharges directly to Second Creek via an underground outfall pipe. See Attachment
2 — Site Map
2. Item 3(c) Other — Description of Discharge
Outfall 001:
a. Storm water which accumulates in an outdoor retention pond located adjacent to the cooling
tower and chemical storage areas. See Attachment 2 — Site Map.
b. 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:
a. Non -contact cooling water.
b. Water conditioning products (i.e. Corrshield MD4100, Propylene Glycol, Sodium Hypochlorite,
GENGARD GN8005, Sulfuric Acid, and Spectrus DT 1404).
c. 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.
d. Blowdown wastewaters (cooling tower, evaporative coolers, and boiler).
3. Items 4 and 5 — Chemicals Added to Wastewater (Outfall 002)
a. See Attachment 3 for correspondence from Plant Rowan County to the North Carolina
Department of Natural Resources, Division of Water Quality (NC DWQ) regarding the use of
specific corrosion inhibitors (i.e. Corrshield MD4100 and Propylene Glycol). The facility uses
Sodium Hypochlorite , GENGARD GN8005, and Sulfuric Acid as water conditioning products
in the cooling tower, as well as Spectrus DT 1404 (sodium bisulfite) to eliminate residual
chlorine. MSDS sheets for Sodium Hypochlorite, GENGARD GN8005, Sulfuric Acid and
Spectrus DT 1404 are included in Attachment 4. In addition, the appropriate Biocide 101 Form
and MSDS sheets will be submitted to the Aquatic Toxicology Unit.
4. Item 6 — Wastewater Treatment
a. Outfall 001 — A storm water retention pond is located adjacent to the cooling tower. The
pond collects surface water runoff from the area surrounding the cooling tower and water
chemical storage areas (water chemical storage areas are in containment with valves in order
to control stormwater discharge). The discharge from the pond 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 Second Creek.
b. 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
a. 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 gallons a day) during
heavy rain events. The discharge for 002 which is continuous during intermittent plant
operations ranges from 150,00 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 because it is an intermediate/peaking resource.
Please feel free to contact Michelle Kroh at 704-278-6657 or myself at 205-257-2647 if you have any
questions regarding this submittal.
Sincerely,
Circe Starks
Environmental Affairs Manager
Southern Power Company
Attachments: Attachment 1: Notice of Renewal Intent for NCG500582
Attachment 2: Site Map
Attachment 3: Agency Correspondence
Attachment 4: MSDSs
Attachment 5: Water Flow Diagram

77A
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Charles Wakild, P.E. Dee Freeman
Governor Director Secretary
NOTICE OF RENEWAL INTENT
Application for renewal of existing coverage under General Permit NCG500000
Existing Certificate of Coverage (CoC): NCG500582
(Please print or type)
1) Mailing address* of facility owner/operator:
Company Name Southern Power Company
Owner Name Southern Power Company
Street Address 600 18`'' Street North/15N-8198
City Birmingham State AL ZIP Code 35203
Telephone Number [phone] Fax: [phone]
Email address [e-mail] (Circe Starks, Environmental Affairs Manager)
* Address to which all permit correspondence should be mailed
2) Location of facility producing discharge:
Facility Name Plant Rowan County
Facility Contact Michelle Kroh
Street Address 5755 NC 801 Highway
City Salisbury State NC ZIP Code 28147
County Rowan
Telephone Number 704-278-6657 Fax [phone]
Email address [e-mail]
3) Description of Discharge:
a) Is the discharge directly to the receiving stream? ® Yes ® No Please see Cover Letter, part 1
(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 Outfall (s) #: 002
® Condensate Outfall (s) #: 002
® Other Outfall (s) #: 001 & 002
(Please describe "Other") Please see Cover Letter, part 2
d) Volume of discharge per each discharge point (in GPD): Please see Cover Letter, part 5
#001: 250 #002: 240,000 #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): Please see Cover Letter, part 3
® Chlorine
❑ 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:
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 ❑ No Please see Cover Letter, part 4
(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 ® Intermittent ❑ Seasonal*
i) If the discharge is intermittent, describe when the discharge will occur:
During cooling tower blowdown activities. Please see Cover Letter, part 5
ii) *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?
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 + 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 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: Ronnie Walston
Title: Plant Manager
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(Signature o Applicant) (Date
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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 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 3

•
Ceir
I . '! - a�erd4 L. % i
:p ti ' = r 1-; t reek
-:__ _
`7Property Boundary
�f r
Map Location
Cooling Tower ,
Outfall 002 •
(Sampling Point)
Legend
Property Boundary - Cooling Tower
Site Boundary Storm Water
Mr Pond
• Outfall Locations
Outfall Underground
— Discharge Pipe
Storm Water Pond
Outfall 001
Outfall 002.
•• (Underground
• Discharge Pipe)
Attachment 2
Topographic Site Map
Plant Rowan
5755 Highway 801
Salisbury
Rowan County, NC
&t P ivnental Consulting & Inc.
March 2012

Septic Tank System
Potable Use
City
Water
City
Water
Waste taken offsite
T
Portable
Demineralizer
4
Leaks/Rinses
Evap/Consump
Losses
Tank bottom condensate
Pump and haul
Plant Fire Loop
V V
Plant
Systems
A
3 CTs
Double walled tank
Fuel Oil
Forwarding
Pumps Sump
0
Steam
i
Cleaning Wastes
(Pump & Haul)
Or Discharge
I
1
I
1
I
.
I
I
2 CTs 2 Steam
-- Generators
False Start
Drain Tank
Evap/Consump
Losses
Condensate
Return
V
Steam
Turbine
Fuel Oil
Unloading
Sump
>
Drains
Evap/Consump
Losses
Cooling Tower
I
V
♦
Water Wash
Drain Tank
Pump &
Haul
Basin
Dechlorination
Outfall
002
Site
Storm
Water
Cooling
Water
Outfall
P 001