NC0038377_Final Permit_20051205

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Mr. Robert E Beasley, Plant Manager
Progress Energy Carolinas, Inc.
Mayo Electric Generating Plant
10660 Boston Road
Roxboro, North Carolina 27574
Dear Mr Beasley:
Michael F. Easley
Governor
William G. Ross, Jr, Secretary
North Carolina Department of Environment and Natural Resources
Alan W Klimek, P E , Director
Division of Water Quality
December 5, 2005
Subject: Issuance of NPDES Permit
NCO038377
Mayo Electric Generating Plant
Person County
Division personnel have reviewed and approved your application for renewal of the subject permit.
Accordingly, we are forwarding the attached NPDES discharge permit. 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 May 9, 1994 (or as
subsequently amended).
This final permit includes the following major changes from the draft permit sent to you on
October 12, 2005:
• Outfall 007 has been renamed as Outfall 008 to eliminate any possible confusion with stormwater
Outfall 007, which was previously removed from the permit.
• The description of the Internal Outfall 008 was added to the Supplement to Permit Cover Sheet.
• Outfall 006 was eliminated from the Supplement to Permit Cover Sheet to correct an error.
• Classification of Mayo Reservoir was changed to WS -V to correct an error.
• The schedule to perform visual monitoring in the Section A. (10). has been changed to read as
follows: "The initial visual monitoring event shall be performed during the Spring of 2006."
• The following statement has been added to the Section A. (10). as a response to your request: "No
analytical monitoring is required by the permit".
• The wash down water without added chemicals has been added to the list of non-stormwater
discharges which shall be allowed in the stormwater conveyance system (Section A. (10). f (2)) as a
response to your request.
The Division cannot accept calculations of the Instream Waste Concentration you have provided
since your IWC calculation is based on the erroneous assumption that there is a complete and instantaneous
mixing of Ash pond discharge with Mayo reservoir water. You need to conduct a modeling exercise using a
CORMIX or similar type model to determine an IWC under lake conditions.
N C. Division of Water Quality / NPDES Unit Phone [phone]
1617 Mail Service Center, Raleigh, NC 27699-1617 fax- [phone]
Internet: h2o.enr state nc us DENR Customer Service Center. 1800 623-7748

Letter to Nir Beasley, page2
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 Genera_ Statutes, and filed with the Office of Administrative Hearings
(6714 Mail Service Center, Raleigh, North Carolina 27699-6714). Unless such demand is made, this
decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division
may require modification or revocation and reissuance of the permit. 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, the 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 Sergei Chernikov at telephone number [phone], extension 594.
Sincerely,
6w
1�91 XAlan W. Klimek, P.E.
cc. Central Files
NPDES Files
Raleigh Regional Office / Surface Water Protection Section
Aquatic Toxicology Unit
Mr. Roosevelt Childress, EPA Region IV
Environmental Sciences Section, Biological Assessment Unit

Permit No. NCO038377
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,
Carolina power and Light d/b/a/ Progress Energy Carolinas, Inc.
is hereby authorized to discharge wastewater from a facility located at the
Mayo Steam Electric Generating Plant
off of US Highway 501
northeast of Roxboro
Person County
to receiving waters designated as the Mayo Reservoir in the Roanoke River Basin in accordance with
effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III, and IV
hereof.
The permit shall become effective January 1, 2006.
This permit and the authorization to discharge shall expire at midnight on March 31, 2007.
Signed this day December 5, 2005.
ZA '9--)
Alan Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

J'
Permit No. NCO038377
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked.
As of this permit issuance, any previously issued permit bearing this number is no longer effective.
Therefore, the exclusive authority to operate and discharge from this facility arises under the permit
conditions, requirements, terms, and provisions included herein.
Carolina Power and Light d/b/a/ Progress Energy Carolinas, Inc.
is hereby authorized to:
1. Continue to operate the following systems located at Mayo Steam Electric
Generating Plant, off of US Highway 501, northeast of Roxboro, Person County:
• Cooling Tower System (Outfall 001). Less than once per year the cooling
towers and circulating water system are drained by gravity and discharged
directly to Mayo Reservoir.
Ash Pond Treatment System (Outfall 002). Outfall 002 discharges directly
to Mayo Reservoir. The ash pond receives ash transport water, coal pile
runoff, stormwater runoff, cooling tower blowdown, and various low volume
wastes such as boiler blowdown, oily waste treatment, wastes/backwash
from the water treatment processes, plant area wash down water, equipment
heat exchanger water, and treated domestic wastewater.
Internal Outfall 008. Cooling tower blowdown is directly discharged to the
ash pond via the ash pond treatment system Cooling tower blowdown is
usually mixed with ash sluice water prior to discharge to the ash pond.
Cooling tower blowdown is indirectly discharged to Mayo Reservoir via the
ash pond treatment system (Outfall 002).
• Stormwater Discharge System The facility is permitted to discharge
stormwater to Mayo Reservoir through the following outfalls:
Outfall 004 - Drainage from the outside storage area.
Outfall 005 - Drainage from the industrial area and the
oil/bottled gas storage area.
Outfalls 006a, 006b, 006e, 006d, 006e - Drainage from the
cooling tower(s) chemical feed building structure and the
cooling tower area.
2. Discharge from said treatment works and/or outfalls at the locations specified on
the attached maps into Mayo Reservoir, which is classified as WS -V waters in the
Roanoke River Basin.

Permit No NCO038377
A. (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the
Permittee is authorized to discharge from Outfall 001 (Cooling Tower System). Monitoring is
required only during discharge events to the Mayo reservoir Such discharges shall be
limited and monitored by the Permittee as specified below
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Locationl
Flow
Daily
Pump Logs
or similar
readings
E
Free Available Chlorine2
200 µg/L
500 µg/L
Weekly
Grab
E
Time of Chlorine
Addrtion2
2 hours
Weekly
Logs
Total Chromium3
0 2 mg/L
0 2 mg/L
2/ Month
Grab
E
Total Zinc3
1 0 mg/L
1 0 mg/L
2/ Month
Grab
E
Priority Pollutants 3
No Detectable
Amount
Annual
Grab
E
H
6< pH< 9
Weekly
Grab
E
Notes:
1. Sample locations E - Effluent. Samples taken in compliance with the monitoring
requirements listed above shall consist of cooling tower effluent prior to its discharge to
Mayo Reservoir.
2 Monitoring is required only if chlorin? -based compounds is added to the system. Neither free
available chlorine nor total residual chlorine may be discharged from any single generating
unit for more than two hours per day, unless the Permittee demonstrates to the Division of
Water Quality that discharge for more than two hours is required for macroinvertebrate
control. The 500 pg/l limitation is an instantaneous maximum and is to be measured
during the chlorine release period The 200 pg/l limitation is an average during the chlorine
release period. Simultaneous multi -unit chlorination is permitted.
3 Limitations and monitoring requirements for the 126 Priority Pollutants (per 40 CFR Part
423, Appendix A, exclusive of zinc and chromium) apply only if these substances are added
by the permittee for cooling tower maintenance. Compliance with the limitations for the 126
priority pollutants in 40 CFR 423.1:. (d) (1) may be determined by engineering calculations
which demonstrate that the regulated pollutants are not detectable in the final discharge by
the analytical methods in 40 CFR Part 136 All primary industries are required to submit a
priority pollutant analysis in accordance with 40 CFR Part 122 with their application for
permit renewal
The above listed effluent limitations shall be sampled prior to draining the cooling tower(s), at a
location prior to discharge to Mayo Reservoir
There shall be no discharge of polychlorinated biphenyl compounds such as those commonly
used for transformer fluid.

Permit No. NCO038377
A. (2). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the
Permittee is authorized to discharge from Outfall 008 (internal outfall, Cooling Tower
System). Such discharges shall be limited and monitored by the Permittee as specified below -
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Locationl
Flow
Daily
Pump Logs
or similar
readings
E
Free Available Chlornne2
200 µg/L
500 µg/L
Weekly
Grab
E
Time of Chlorine
Addition2
2 hours
Weekly
Logs
Total Chromium3
0 2 mg/L
0 2 mg/L
2/ Month
Grab
E
Total Zinc3
1 0 mg/L
1 0 mg/L
2/ Month
Grab
E
Priority Pollutants 3
No Detectable
Amount
Annual
Grab
E
pH
6 < pH < 9
Weekly
Grab
E
Notes:
1. Sample locations- E - Effluent. Samples taken in compliance with the monitoring
requirements listed above shall consist of cooling tower blowdown after mixing with the
fly and bottom ash, but prior to discharging into the ash pond
2. Monitoring is required only if chlorine -based compound is added to the system. Neither
free available chlorine nor total residual chlorine may be discharged from any single
generating unit for more than two hours per day, unless the Permittee demonstrates to
the Division of Water Quality that discharge for more than two hours is required for
macroinvertebrate control. The 500 pg/1 limitation is an instantaneous maximum and is
to be measured during the chlorine release period. The 200 pg/l limitation is an average
during the chlorine release period. Simultaneous multi -unit chlorination is permitted.
3 Limitations and monitoring requirements for the 126 Priority Pollutants (per 40 CFR Part
423, Appendix A, exclusive of zinc and chromium) apply only if these substances are
added by the permittee for cooling tower maintenance. Compliance with the limitations
for the 126 priority pollutants in 40 CFR 423 13 (d)(1) may be determined by engineering
calculations which demonstrate that the regulated pollutants are not detectable in the
final discharge by the analytical methods in 40 CFR Part 136 All primary industries are
required to submit a priority pollutant analysis in accordance with 40 CFR Part 122 with
their application for permit renewal
This outfall is not authorized to discharge directly to the Mayo Reservoir

Permit No NCO038377
A. (3). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the
Permittee is authorized to discharge from Outfall 002 (Ash Pond Treatment System). Such
discharges shall be limited and monitored by the Permittee as specified below
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement Sample Sample
Frequency Type Locationi
Flow
Weekly Pump Logs or E
similar
readings
Oil and Grease
15 0 m L
20 0 m L
Monthly Grab E
Total Suspended
Solids
30 0 mg/L
100 0 mg/L
Monthly Grab E
Total Selenium
3 8 lbs day
2 Month Grab E
Acute Toxicity
Quarterly Grab E
Total Arsenic
Quarterly Grab E
Total Copper
Quarterly Grab E
Total Iron
Quarterly Grab E
pH
6 < pH < 9
2 / Month Grab E
Notes:
1 Sample locations. E - Effluent Samples taken in compliance with the monitoring
requirements listed above shall be taken prior to mixing with other waste streams.
2 Acute Toxicity (Fathead Minnow 24hr) No significant mortality at 90%; February, May,
August, and November, See Special Condition A. (5).
There shall be no discharge of floating solids or visible foam in other than trace amounts outside
an area five(5) meters from the discharge pipe No chemical metal cleaning waste may be
discharged to the ash pond There shall be no discharge of polychlorinated biphenyl compounds
such as those commonly used for transformer fluid

Permit No. NCO038377
A. (4). STORMWATER MONITORING REQUIREMENTS/ Qualitative Monitoring
Qualitative monitoring requires a qualitative inspection of each stormwater outfall, regardless of
representative outfall status, for the purpose of evaluating the effectiveness of the Stormwater
Pollution Prevention Plan and assessing new sources of stormwater pollution No analytical
tests are required Qualitative monitoring of stormwater outfalls does not need to be performed
during a representative storm event.
Stormwater Discharge
Characteristics
Measurement
Fre uencyl
Sample
Location
Color
Semi -Annual
SDO
Odor
Semi -Annual
SDO
Clan
Semi -Annual
SDO
Floating Solids
Semi -Annual
SDO
Suspended Solids
Semi -Annual
SDO
Foam
Semi -Annual
SDO
Oil Sheen
Semi -Annual
SDO
Other obvious indicators of stormwater
pollution
Semi -Annual
SDO
Notes:
1. Measurement Frequency Qualitative monitoring will be performed twice per year, once in
the spring (April - June) and once in the fall (September - November)
2. Sample Location SDO- Stormwater Discharge Outfall.

unap //sergei chenukov%40dwq denr ncmail net@cros ncmail.net 143/
Subject: Re: Mayo Power Plant (NC0038377)
From: Shell.Kame-Jo@epamail epa.gov
Date: Tue, 06 Dec 2005 10:1423 -0500
To: Sergei Chernikov <[e-mail]>
I have no comments on this permit.
Karrie-Jo Robinson -Shell, P.E.
Sergei Chernikov
<sergei.cherniko
[e-mail]>
12/06/2005 09:21
AM
To
Karrie-Jo Shell/R4/USEPA/US@EPA
cc
Subject
Mayo Power Plant (NC0038377)
Karrie-Jo,
I was wondering if you had any objections against issuing permit for
Mayo Plant (NC0038377). Please let me know.
Thank you!
Sergei
Sergei Chernikov, Ph.D.
Environmental Engineer
NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
phone: [phone] ext. 594
fax: [phone]
1 of 1 12/6/2005 10:20 AM

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0038377, Progress Energy Carolinas, Inc.
Mao Steam Electric Generating Plant
SUMMARY
The Mayo Electric Generating Plant is a coal-fired electric generating plant with one
unit rated at a maximum dependable capacity of 745 mw. Water for plant uses is
withdrawn from the Mayo Reservoir as required to make up evaporative losses from
the cooling tower, boiler water and drinking water needs. This facility is subject to
EPA effluent guideline limits per 40 CFR 423- Steam Electric Power Generating Point
Source Category. The facility is not subject to the 316(b) Phase II regulations since it
is a closed cycle cooling system and has a design flow of less than 50 MGD.
The facility operates the following outfalls:
• Outfall 001 — Cooling tower system. This system is drained for maintenance
approximately once a year to the reservoir. The discharge is monitored and
reported on the DMRs.
Outfall 002 — Ash pond treatment system (including low volume waste, ash
sluice water, cooling tower blowdown, coal pile runoff, etc. Cooling tower
blowdown is usually mixed with bottom and fly ash prior to discharging into
the ash pond.
Outfalls 004, 005, and 006a, b, c, d, e — stormwater outfalls.
TOXICITY TESTING:
Current Requirement: Acute P/F at 90%, February, May, August, November.
Proposed Requirement: Acute P/F at 90%, February, May, August, November.
Facility Information
Applicant/ Facility Name:
Progress Energy Carolinas/ Mayo Steam Electric Generating Plant
Applicant Address:
10660 Boston Road, Roxboro, NC 27573
Facility Address:
same
Permitted Flow
Not limited
Type of Waste:
99.8 % Industrial, 0.2% - domestic
Facility/Permit Status:
Existing/ Renewal
County:
Person
Miscellaneous
Receiving Stream:
Mao Reservoir
Regional Office:
RRO
Stream Classification:
WS -V
Quad
A23SW
303(d) Listed?:
No
Permit Writer.
Sergei Chernikov
Subbasin:
030205
Roanoke
Date:
September 15, 2005
Drainage Area mit :
Lake
�ry
Summer 7Q10 cfs
30Q2 (cfs):
Average Flow cfs :
IWC (%):
Primary SIC Code:
SUMMARY
The Mayo Electric Generating Plant is a coal-fired electric generating plant with one
unit rated at a maximum dependable capacity of 745 mw. Water for plant uses is
withdrawn from the Mayo Reservoir as required to make up evaporative losses from
the cooling tower, boiler water and drinking water needs. This facility is subject to
EPA effluent guideline limits per 40 CFR 423- Steam Electric Power Generating Point
Source Category. The facility is not subject to the 316(b) Phase II regulations since it
is a closed cycle cooling system and has a design flow of less than 50 MGD.
The facility operates the following outfalls:
• Outfall 001 — Cooling tower system. This system is drained for maintenance
approximately once a year to the reservoir. The discharge is monitored and
reported on the DMRs.
Outfall 002 — Ash pond treatment system (including low volume waste, ash
sluice water, cooling tower blowdown, coal pile runoff, etc. Cooling tower
blowdown is usually mixed with bottom and fly ash prior to discharging into
the ash pond.
Outfalls 004, 005, and 006a, b, c, d, e — stormwater outfalls.
TOXICITY TESTING:
Current Requirement: Acute P/F at 90%, February, May, August, November.
Proposed Requirement: Acute P/F at 90%, February, May, August, November.

NPDES PERMIT FACT SHEET
Page 2
Progress- Asheville
NPDES No. NC0000396
The facility has passed all chronic toxicity tests during the previous 4.5 years.
COMPLIANCE SUMMARY: BASED ON THE PREVIOUS 5 YEARS
There are no outstanding and/or chronic compliance problems related to the NPDES
permit. A compliance evaluation inspection conducted on 03/31/05 found that
facility is in compliance. The only Notice of Violation that was issued during previous
5 years was for TRC (10/13/2003). Letter from Environmental Sciences Branch
(05/09/05) concurred with the latest report from Progress that chemical and
biological characteristics of Mayo reservoir are similar to prior years.
REASONABLE POTENTIAL ANALISYS
Reasonable potential analyses were conducted for arsenic and selenium. No new
limits are recommended. Arsenic monitoring in fish tissue is added to the permit
based on the results of reasonable potential analysis (Condition A.(11).). A special
study must be conducted on selenium yearly (Condition A.(6).).
PROPOSED CHANGES
Monitoring Frequencies: The monitoring frequency for Oil and Grease and Total
Suspended Solids have been reduced to Monthly based on DMR data and as a
response to the permittee's request. Analytical monitoring requirements for
stormwater have been eliminated based on DMR data and as a response to the
permittee's request. The following statement has been added to the effluent
limitations page for Outfall 001 in response to the permittee's request: Monitoring for
total residual chlorine is required only if chlorine -based compound is added to the
system".
Limits: No changes are proposed.
Misc: In response to the permittee request, an internal outfall 007 was created
to monitor the influent to the ash pond from the cooling tower system, which consists
mostly of cooling tower blowdown. An external outfall 001 is designated for an
infrequent drainage of the cooling tower system directly to the Mayo reservoir. Such
drainage is usually conducted once a year for repairs and maintenance of cooling
towers. Permit expiration date was changed to 03/31/2007 to be consistent with
basinwide schedule.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: 10/12/05 (est.)
Permit Scheduled to Issue: 12/12/05 (est.)
STATE CONTACT
If you have any questions on any of the above information or on the attached permit,
please contact Sergei Chernikov at [phone], extension 594.

NPDES PERMIT FACT SHEET Progress- Asheville
Page 3 NPDES No. NC0000396
SIGNIFICANT CHANGES TO THE FINAL PERMIT:
• Outfall 007 has been renamed as Outfall 008 to eliminate any possible
confusion with storm water Outfall 007, which was previously removed
from the permit.
• Description of the Internal Outfall 008 was added to the Supplement to
Permit Cover Sheet.
• Outfall 006 was eliminated from the Supplement to Permit Cover Sheet
to correct an error.
• Classification of Mayo Reservoir was changed to WS -V to correct an
error.
• Schedule to perform visual monitoring in the Section A. (10). has been
changed to read as follows: "The initial visual monitoring event shall be
performed during the Spring of 2006".
• The following statement has been added to the Section A. (10). as a
response to the permittee's request: "No analytical monitoring is required
by the permit".
• The wash down water without added chemicals has been added to the
list of non-stormwater discharges which shall be allowed in the
stormwater conveyance system (Section A. (10). f (2)) as a response to
the permittee's request.