NC0038377_Final Permit_20001213

State of North Carolina
Department of Environment
and Natural Resources 00
Division of Water Quality
games B. Hunt, Jr., Governor
Bill Holman, Secretary NCDENR
Kerr T. Stevens, Director
December 13, 2000
Mr. Charles M. Gates, Manager
CP&L- Mayo Electric Generating Plant
10660 Boston Road
Roxboro, North Carolina 27573
Subject. NPDES Permit Issuance
Permit No. NCO038377
CP&L- Mayo
Person County
Dear Mr Gates:
Division staff have reviewed and approved your renewal application for an NPDES discharge
permit. Accordingly, the Division is forwarding the subject NPDES 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).
Based on comments received on the DRAFT permit, the following items were incorporated into
this FINAL permit:
Outfall 001- Cooling Tower System
■ The effluent limit for pH will remain in place, since the requirement applies prior to
mixing with other waste streams.
■ The free available chlorine (FAC) limit of 500 ug/1 will remain as an instantaneous
maximum limit. The regulation in 40 CFR 423.12 uses the term "maximum
concentration" and not "daily maximum concentration" for FAC. Use of the term "daily
maximum" in an NPDES permit would authorize the averaging of discharge
concentrations over longer periods of time and consequently the discharge of
significantly more chlorine than allowed by the regulations.
■, The requirement for sampling of the cooling tower drainage prior to direct discharge to
Mayo Reservoir has been modified. Sampling will now be required prior to the draining
operation rather than during operation.
Outfall 002- Ash Pond Treatment System
■ Monitoring for arsenic, copper, and iron will remain on a quarterly basis, given the large
monthly average discharge volume.
Stormwater Outfalls
■ The phrase "or expansion" was removed from the first sentence of A(3) Stormwater
Limitations and Monitoring Requirements.
■ Stormwater outfalls 007 a,b monitoring requirements were removed from the permit.
Miscellaneous
■ Minor grammatical changes were made to add further text clarification, and some text
was reformatted to improve presentation.
■ The NPDES boilerplate language was updated to reflect the most recent version.
■ Permit reopener language was modified to reflect that studies must be conducted or
supervised by DWQ staff (see Part I, Section A).
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer Visit us on the INTERNET Q www enr state nc us

1
NPDES Pernut Issuance
4. Permit No. NCO038377
CP&L- Mayo
Page 2
■ O&M requirements specified in Part I, Section B.2 have been deleted. The standard
boilerplate condition included for all individual NPDES permits for proper O&M is
included in Part II, Section C.2
■ The reopener language within the Acute Toxicity Test Special Condition will remain as
is This language is consistent with all other NPDES permits issued with whole effluent
toxicity test requirements
■ The due date for the annual selenium study [Special Condition A(6)] has been changed
from April 1 to May 1
■ Monitoring of waters from Crutchfield Branch has been changed from quarterly to
annually The detection limit for copper should be at or below the action level (7 ug/1)
to provide the most useful data for further consideration of monitoring needs
■ The Division will re-evaluate CP&L's request to add "upsets" along with bypassing and
power failures as an exception to noncompliance in the boilerplate (Section B.3 Civil
and Criminal Liability) during the next boilerplate revision (planned for 2001)
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, 6714 Mail Service Center, Raleigh, North Carolina 27699-
6714. Unless such a demand is made, this permit shall be final and binding
Please take notice that this permit is not transferable except after notice to the Division Part
II, E 4. addresses the requirements to be followed in case of change in ownership or control of
this discharge. 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, the Division of Land Resources, the Coastal Area
Management Act, or any other federal or local governmental permit.
If you have any questions concerning this permit, please contact Tom Belmck at telephone
number [phone], ext. 543
0rq.---- 'Signed Cy
David A. Goodrich
Kerr T. Stevens
Enclosure: NPDES Permit No. NC0038377
cc* Mr. Roosevelt Childress, EPA
Raleigh Regional Office, Water Quality
Point Source Compliance Enforcement Unit
Central Files
NPDES UnA0

Permit No. NCO038377
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER (,QUALITY
PFRMTT
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 Company
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 limutations, monitoring requirements, and other conditions set forth in Parts I, II, III, and IV
hereof.
The permit shall become effective February 1, 2001
This permit and the authorization to discharge shall expire at midnight on January 31, 2006.
Signed this day December 13, 2000.
Original Signed By
David A. Goodrich
Kerr T. Stevens, Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit No. NCO038377
SUPPLEMENT TO PERMIT COVER SHEET
Carolina Power & Light Company
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 via Outfall 001. Conversely, cooling tower blowdown is indirectly
discharged to Mayo Reservoir via the ash pond treatment system (Outfall 002).
Cooling tower blowdown water is usually mixed with ash sluice water prior to
discharge to the ash pond.
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.
• 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 006, 006a, 006b, 006c, 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 C waters in the Roanoke River
Basin.

3fi 3
78 5
Ash
Mayo Plant Outfalls
Building
• Outfalls,
/A / Road.
Cooling
Towers
31'30 396'N
78 52' 55 605'W
3fi 31' 29 160'N Outfall 006C
M52'56 595"W
Outfall 006D
�36 31'28 152'N
3fi 31' 28 919'N 7852' 55 735-W
M52'57 022'W Cooling Tower Drain
Outfall 006E Outfall 001
500 0 500 1000 Meters

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) Such discharges shall be limited and
monitored by the Permittee as specified below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly Daily Measurement Sample Sample
Average Maximum Frequency Type Locationl
Flow
Daily
Pump Los
E
Free Available Chlonne2
200 Ng/I
500 pg/I
Weekly
Grab
E
Time of Chlorine Addition2
2 hours
Weekly
Logs
Total Chromium3
0 2 mg/I
0 2 mg/I
2/ Month
Grab
E
Total Zmc3
1 0 mg/I
1 0 mg/I
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 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 mo -e than two hours is required for macromvertebrate control The
500 Ng/I limitation is an instantaneous maximum and is to be measured during the chlorine release
period. The 200 /ig/I 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 permit does not authorize a discharge directly to the Mayo Reservoir except during times in which the
cooling tower(s) are drained The Permittee shall notify the Division of Water Quality, Raleigh Regional
Office'([phone]), prior to draining the cooling tower(s), except during non -office hour emergencies
when notification must be made the next working day. 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 002 (Ash Pond Treatment System). Such discharges shall be
limited and monitored by the Permittee as specified below
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly Daily Measurement Sample
Average Maximum Frequency Type
Sample
Locationl
Flow
Weekly
Pump Logs or
similar readings
E
Oil and Grease
15 0 mg/11
20 0 m /I
2 / Month
Grab
E
Total Suspended Solids
30 0 m /I
100 0 m /I
2 / Month
Grab
E
Total Selenium
3 8 lbs/day
2 / Month
Grab
E
Acute Toxicit 2
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
1
A(3). STORMWATER LIMITATIONS AND MONITORING REQUIREMENTS/ Analytical Monitoring
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is
authorized to discharge stormwater from Outfall 004 (drainage from outside storage area), Outfall 005
(drainage from industrial area and oil/botbed gas storage area), and Outfalls 006 a, b, c, d, a (drainage
from cooling tower(s) chemical feed buildiing structure and the cooling tower area) Such discharges shall
be limited and monitored by the Permittee as specified below:
STORMWATER
DISCHARGE
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Units Cut-off
Concentration)
Measurement Sample Sample
Frequency2 Type Location3
Total Flow4
MG
Annual
SDO
Total Rainfall4
Inches
Annual
Event Duration
Minutes
Annual
Oil and Grease
M /I
300
Annual
Grab
SDO
COD
M /I
1200
Annual
Grab
SDO
TSS
M /I
1000
Annual
Grab
SDO
Notes:
1. Cutoff Concentration For each parameter, the arithmetic mean of all analytical sampling results
collected during the first year of the permit shall be calculated for each individual outfall and compared
to the cut-off concentrations listed. If the arithmetic mean is below the specified cut-off concentration
for a given parameter, then the facility is not required to continue annual analytical monitoring for that
parameter at the outfall during the term of the permit unless a significant change in facility operations
or configuration occurs. If a cut-off concentration results in discontinued analytical monitoring at an
individual discharge outfall, the permittee is required to maintain facility operations that ensure the
continuation of stormwater runoff quality.
2. Measurement freauency. Once per year The facility must perform analytical sampling during the first
full year and last year of the permit term regardless of cut-off concentration conditions Analytical
results from sampling during the final year of the permit term must be submitted with the permit
renewal application Failure to monitor storm events in accordance with the specified frequency shall
constitute a violation of this permit
3 Sample Location Samples to be collected at each stormwater discharge outfall (SDO) unless
representative outfall status has been granted. If a facility has multiple discharge locations with
substantially identical stormwater discharges that are required to be sampled, the Permittee may
petition the Director for representative outfall status. If it is established that the stormwater discharges
are substantially identical and the permittee is granted representative outfall status, then sampling
requirements maybe performed ata reduced number of outfalls. For Outfalls 006 a -e, one
representative outfall may be monitored.
4 For each sampled representative storm event the total precipitation, storm duration, and total flow
must be monitored. Total flow shal be either: (a) measured continuously, (b) calculated based on the
amount of area draining to the outfall, the amount of build -upon (impervious) area, and the total
amount of rainfall, or (c) estimated by the measurement of flow at 20 minute intervals during the
rainfall event (not to exceed three tours)
For purposes of the stormwater sampling required in this permit, all samples shall be collected from a
discharge resulting from a representative storm event (See Part II, Section A(17)).

Permit No NC0038377
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 uenc l
Sample
Location2
Color
Semi -Annual
SDO
Odor
Semi -Annual
SDO
Clarity
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 The first qualitative monitoring event during the term of the permit must be
performed during the initial analytical monitoring event All subsequent 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

Permit No. NCO038377
SPECIAL CONDITIONS
A(5). ACUTE TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
Outfall 002 (Ash Pond )
The permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined in the North
Carolina Procedure Document entitled "Pass/Fail Methodology For Determining Acute Toxicity In A Single
Effluent Concentration" (Revised -July, 1992 or subsequent versions). The monitoring shall be performed
as a Fathead Minnow (Pimephales promelas) 24 hour static test. The effluent concentration at which there
may be at no time significant acute mortality is 90% (defined as treatment two in the procedure document)
Effluent samples for self-monitoring purposes must be obtained during representative effluent discharge
below all waste treatment. The tests will be performed during the months of February, May, August and
November.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR -1) for the month in which it was performed, using the parameter code TGE6C.
Additionally, DWQ Form AT -2 (original) is to be sent to the following address:
Attention: North Carolina Division of Water Quality
Environmental Sciences Branch
1621 Mail Service Center
Raleigh, North 3arolina 27699-1621
Completed Aquatic Toxicity Test Forma shall be filed with the Environmental Sciences Branch no later
than 30 days after the end of the reporting period for which the report is made
Test data shall be complete and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data Total residual chlorine of
the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the
waste stream
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test form
indicating the facility name, permit numoer, pipe number, county, and the month/year of the report with the
notation of "No Flow" in the comment area of the form. The report shall be submitted to the Environmental
Sciences Branch at the address cited above.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring
will begin immediately until such time that a single test is passed Upon passing, this monthly test
requirement will revert to quarterly in the months specified above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, then monthly
monitoring will begin immediately until such time that a single test is passed. Upon passing, this monthly
test requirement will revert to quarterly in the months specified above
Should any test data from either these monitoring requirements or tests performed by the North Carolina
Division of Water Quality indicate potential impacts to the receiving stream, this permit may be re -opened
and modified to include alternate monitoring requirements or limits.
NOTE. Failure to achieve test conditions as specified in the cited document, such as minimum control
organism survival and appropriate environmental controls, shall constitute an invalid test and will require
immediate follow-up testing to be completed no later than the last day of the month following the month of
the initial monitoring.

Permit No NC0038377
A (6). SELENIUM STUDY
The Permittee shall conduct biological and physical/chemical studies on selenium and its effect in the reservoir
The results shall be submitted each year by May 1 for the prior calendar year The plan of study shall be
submitted to the Director of the Division of Water Quality for approval.
A (7). CRUTCHFIELD BRANCH
There shall be no direct discharge of wastewater from the ash pond to Crutchfield Branch There shall be no
violation of water quality standards in Crutchfield Branch due to any indirect discharge from the ash pond. The
Permittee shall monitor the waters of Crutchfield Branch, 100 yards downstream of the dike, once per year by grab
sample for the following arsenic, copper, and selenium
A (8). DOMESTIC WASTEWATER TREATMENT PLANT
The domestic wastewater treatment plant shall be properly operated and maintained to ensure treatment of
domestic wastewater to secondary levels
A(9). STORMWATER POLLUTION PREVENTION PLAN
The permittee shall develop a Stormwater Pollution Prevention Plan, herein after referred to as the Plan.
The Plan shall be considered public information in accordance with Part ll, Section E 10 of this permit.
The Plan shall include, at a minimum, the following items:
a Site Plan The site plan shall provide a description of the physical facility and the potential
pollutant sources which may be expected to contribute to contamination of regulated stormwater
discharges The site plan shall contain the following
(1) A general location map (USGS quadrangle map, or appropriately drafted equivalent map),
showing the facility's location in relation to transportation routes and surface waters, and
the name of the receiving water(s) to which the stormwater outfall(s) discharges If the
discharge is to a municipal separate storm sewer system, the name of the municipality
and the ultimate receiving waters, and accurate latitude and longitude of the point(s) of
discharge must be shown.
(2) A narrative description of storage practices, loading and unloading activities, outdoor
process areas, dust or particulate generating or control processes, and waste disposal
practices.
(3) A site map (or series of maps) drawn to scale with the distance legend indicating location
of industrial activities (including storage of materials, disposal areas, process areas, and
loading and unloading areas), drainage structures, drainage areas for each outfall and
activities occurring in the drainage area, building locations and impervious surfaces, the
percentage of each drainage area that is impervious For each outfall, a narrative
description of the potential pollutants which could be expected to be present in the
regulated stormwater discharge
(4) A list of significant spills or leaks of pollutants that have occurred at the facility during the 3
previous years and any corrective actions taken to mitigate spill impacts.
(5) Certification that the stormwater outfalls have been evaluated for the presence of non-
stormwater discharges. The certification statement will be signed in accordance with the
requirements found in Part II, Section B 11
b Stormwater Management Plan: The stormwater management plan shall contain a narrative
description of the materials management practices employed which control or minimize the

Permit No. NCO038377
exposure of significant materials to stormwater, including structural and non-structural measures
The stormwater management plan, at a minimum, shall incorporate the following.
(1) A study addressing the technical and economic feasibility of changing the methods of
operations and/or storage practices to eliminate or reduce exposure of materials and
processes to stormwater Wherever practicable the permittee should consider covering
storage areas, material handling operations, manufacturing or fueling operations to
prevent materials exposure to stormwater. In areas where elimination of exposure is not
practicable, the stormwater management plan shall document the feasibility of diverting
the stormwater runoff away from areas of potential contamination
(2) A schedule to provide secondary containment for bulk storage of liquid materials, storage
of Section 313 of Title II of the Superfund Amendments and Reauthorization Act (SARA)
water priority chemicals, or storage of hazardous materials to prevent leaks and spills
from contaminating stormwater runoff If the secondary containment devices are
connected directly to stormwater conveyance systems, the connection shall be controlled
by manually activated valves or other similar devices [which shall be secured with a
locking mechanism] and any stormwater that accumulates in the containment area shall
be at a minimum visually observed prior to release of the accumulated stormwater.
Accumulated stormwater shall be released if found to be uncontaminated. Records
documenting the individual making the observation, the description of the accumulated
stormwater and the date and time of the release shall be kept for a period of five years.
(3) A narrative description of Best Management Practices (BMPs) to be considered such as,
but not limited to, oil and grease separation, debris control, vegetative filter strips,
infiltration and stormwater detention or retention, where necessary The need for
structural BMPs shall to based on the assessment of potential of sources contributing
significant quantities of pollutants to stormwater discharges and data collected through
monitoring of stormwater discharges
(4) Inspection schedules of stormwater conveyances and controls and measures to be taken
to limit or prevent erosion associated with the stormwater systems.
Spill Prevention and Response Plan- The Spill Prevention and Response Plan shall incorporate a
risk assessment of potential polllutant sources based on a materials inventory of the facility Facility
personnel (or team) responsible for implementing the plan shall be identified in the plan A
responsible person shall be onsite at all times during facility operations that have the potential to
contaminate stormwater runoff through spills or exposure of materials associated with the facility
operations.
d Preventative Maintenance and Good Housekeeping Program A preventative maintenance
program shall be developed The program shall document schedules of inspections and
maintenance activities of storm4vater control systems, plant equipment and systems. Inspection of
material handling areas and regular cleaning schedules of these areas shall be incorporated into
the program
e. Training schedules shall be developed and training provided at a minimum on an annual basis on
proper spill response and cleanup procedures and preventative maintenance activities for all
personnel involved in any of the facility's operations that have the potential to contaminate
stormwater runoff. Facility personnel (or team) responsible for implementing the training shall be
identified in the plan.
The Stormwater Pollution Prevention Plan shall identify a specific position(s) responsible for the
overall coordination, development, implementation, and revision to the Plan. Responsibilities for
all components of the Plan shall be documented and position(s) assignments provided.
g. Plan Amendment. The permrttee shall amend the Plan whenever there is a change in design,
construction, operation, or maintenance which has a significant effect on the potential for the

Permit No NC0038377
discharge of pollutants via a point source to surface waters The Stormwater Pollution Prevention
Plan shall be reviewed and updated on an annual basis.
The director may notify the permittee when the Plan does not meet one or more of the minimum
requirements of the permit Within 30 days of such notice, the permittee shall submit a time
schedule to the Director for modifying the Plan to meet minimum requirements The permittee
shall provide certification in writing (in accordance with Part III, Standard Conditions, Section
B 11 ) to the Director that the changes have been made
Facility Inspections Inspections of the facility and all stormwater systems shall occur at a
minimum on a semiannual schedule, once in the fall (September - November) and once during the
spring (April - June). The inspection and any subsequent maintenance activities performed shall
be documented, recording date and time of inspection, individuals) making the inspection and a
narrative description of the facility's stormwater control systems, plant equipment and systems
Records of these inspections shall be incorporated into the Stormwater Pollution Prevention Plan
Visual monitoring as required in A(4) Stormwater Monitoring Requirements/Qualitative Monitoring
shall be performed in addition to facility inspections
Implementation Implementation of the Plan shall include documentation of all monitoring,
measurements, inspections, maintenance activities and training provided to employees, including
the log of the sampling data Activities taken to implement BMPs associated with the industrial
activities, including vehicle maintenance activities, must also be recorded All required
documentation shall be kept on-site for a period of five years and made available to the Director or
his authorized representative immediately upon request.
A(10). STORMWATER MINIMUM MONITORING AND REPORTING REQUIREMENTS
Minimum monitoring and reporting requirements are as follows unless otherwise approved in writing by the
Director of the Division of Water Quality.
a If a facility has multiple discharge locations with substantially identical stormwater discharges that
are required to be sampled, the permittee may petition the Director for representative outfall
status If it is established that the stormwater discharges are substantially identical and the
permittee is granted representative outfall status, then sampling requirements may be performed
at a reduced number of outfalls.
b Visual monitoring for color, odor, solids, foam, outfall staining, visible sheens and dry weather flow
shall be performed at all stormwater discharge outfall locations. All visual monitoring shall be
documented and records maintained with the Stormwater Pollution Prevention Plan. The initial
visual monitoring event shall be performed simultaneously with the first analytical monitoring event
and documentation of only this initial visual monitoring event shall be submitted along with the
required analytical monitoring submittal.
C For purposes of the stormwater sampling required in this permit, all samples shall be collected
from a discharge resulting from a representative storm event (See definitions in Part II, Section A).
Failure to monitor storm events in accordance with the specified frequency shall constitute a
violation of this permit. If the stormwater runoff is controlled by a detention pond, the following
sampling requirements shall apply:
(1) If the detention pond detains the runoff generated by one inch of rainfall for 24 hours,
visual observations for color, foam, outfall staining, visible sheens and dry weather flow
are required, but analytical sampling shall not be required
(2) If the detention pond discharges only in response to a storm event exceeding a 25 -year,
24-hour storm, the pond shall be considered a non -discharging stormwater control system
and not subject to NPDES requirements, unless the discharge causes a violation of water
quality standards

Permit No NCO038377
d Samples analyzed in accordance with the terms of this permit shall be submitted on forms
approved by the Director no later than January 31 for the previous year in which sampling was
required to be performed
e Analytical results from sampling during the final year of the permit term shall be submitted with the
permit renewal application
f This permit regulates stormwater discharges associated with industrial activity. Non-stormwater
discharges which shall be allowed in the stormwater conveyance system are,
(1) All other discharges that are authorized by an NPDES permit
(2) Foundation drains, air -conditioner condensate without added chemicals, springs, waterline
and fire hydrant, water from footing drains, flows from riparian habits and wetlands, fire-
fighting training and fire system testing
(3) Discharges resulting from fire -fighting.
g If the storm event monitored and reported in accordance with this permit coincides with a non-
stormwater discharge, the permittee shall separately monitor and report all parameters as required
under the non-stormwater portion of this permit and provide this information with the stormwater
discharge monitoring report

Boilerplate Part I ,
Page 1 of 1
PART 1
WASTEWATER AND STORMWATER MONITORING, CONTROLS, AND LIMITATIONS FOR
PERMITTED DISCHARGES
Section A Final Limitations and Controls for Wastewater Discharges
1 This permit shall be modified or revoked and reissued to incorporate toxicity limitations and
monitoring requirements in the event toxicity testing or other studies conducted on the
effluent or receiving stream by or under DWQ supervision indicate that detrimental effects
may be expected in the receiving stream as a result of this discharge.
Section B. Schedule of Compliance
1. The permittee shall comply with Final Effluent Limitations and monitoring requirements,
stormwater monitoring, and stormwater controls specified for discharges in accordance
with the following schedule.
Permittee shall comply with Final Effluent Limitations by the effective date of the permit
The Stormwater Pollution Prevention Plan shall be developed and implemented within 12
months of the effective date of this permit and updated thereafter on an annual basis.
Secondary containment, as specified in Part Il, Section A.19 of this permit, shall be
accomplished within 12 months of the effective date of this permit.
2. No later than 14 calendar days following a date identified in the above schedule of
compliance, the permittee shall submit either a report of progress or, in the case of specific
actions being required by identified dates, a written notice of compliance or noncompliance
In the latter case, the notice shall include the cause of noncompliance, any remedial actions
taken, and the probability of meeting the next schedule requirements.

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PART II
STANDARD CONDITIONS FOR NPDES PERMITS
SECTION A DEFINITIONS
1. Permit Issuing Authority
The Director of the Division of Water Quality.
2. DEM or "the Division"
Means the Division of Water Quality, Department of Environment, Health and Natural
Resources.
3 EMC
Used herein means the North Carolina Environmental Management Comi-nission.
4. Act or "the Act"
The Federal Water Pollution Control Act, also known as the Clean Water Act, as amended,
33 USC 1251, et seq
5. Mass/Dav Measurements
a. The "monthly average discharge" is defined as the total mass of all daily discharges
sampled and/or measured during a calendar month on which daily discharges are
sampled and measured, divided by the number of daily discharges sampled and/or
measured during such month It is therefore, an arithmetic mean found by adding the
weights of the pollutant found each day of the month and then dividing this sum by the
number of days the tests were reported. The linutation is identified as "Monthly
Average" in Part I of the permit
b The "weekly average discharge" is defined as the total mass of all daily discharges
sampled and/or measured during the calendar week (Sunday - Saturday) on which
daily discharges are sampled and measured, divided by the number of daily discharges
sampled and/or measured during such week. It is, therefore, an arithmetic mean found
by adding the weights of pollutants found each day of the week and then dividing this
sum by the number of days the tests were reported This lirrutation is identified as
"Weekly Average" in Part I of the permit.
c. The "maximum daily discharge" is the total mass (weight) of a pollutant discharged
during a calendar day. If only one sample is taken during any calendar day the weight
of pollutant calculated from it is the "maximum daily discharge." This limitation is
identified as "Daily Maximum," in Part I of the permit
d. The "average annual discharge" is defined as the total mass of all daily discharges
sampled and/or measured during the calendar year on which daily discharges are
sampled and measured, divided by the number of daily discharges sampled and/or
measured during such year. It is, therefore, an arithmetic mean found by adding the
weights of pollutants found each day of the year and then dividing this sum by the
number of days the tests were reported. This limitation is defined as "Annual Average"
in Part I of the permit.

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6. Concentration Measurement
a The "average monthly concentration," other than for fecal coliform bacteria, is the sum
of the concentrations of all daily discharges sampled and/or measured during a
calendar month on which daily discharges are sampled and measured, divided by the
number of daily discharges sampled and/or measured during such month (arithmetic
mean of the daily concentration values). The daily concentration value is equal to the
concentration of a composite sample or in the case of grab samples is the arithmetic
mean (weighted by flow value) of all the samples collected during that calendar day.
The average monthly count for fecal coliform bacteria is the geometric mean of the
counts for samples collected during a calendar month. This limitation is identified as
"Monthly Average" under "Other Limits" in Part I of the permit.
b. The "average weekly concentration," other than for fecal coliform bacteria, is the sum of
the concentrations of all daily discharges sampled and/or measured during a calendar
week (Sunday/ Saturday) on which daily discharges are sampled and measured divided
by the number of daily discharges sampled and/or measured during such week
(arithmetic mean of the daily concentration values) The daily concentration value is
equal to the concentration of a composite sample or in the case of grab samples is the
arithmetic mean (weighted by flow value) of all the samples collected during that
calendar day The average weekly count for fecal coliform bacteria is the geometric
mean of the counts for samples collected during a calendar week. This limitation is
identified as "Weekly Average" under "Other Limits" in Part I of the permit.
c The "maximum daily concentration" is the concentration of a pollutant discharge during
a calendar day If only one sample is taken during any calendar day the concentration
of pollutant calculated from it is the "Maximum Daily Concentration". It is identified as
"Daily Maximum" under "Other Limits" in Part I of the permit.
d. The "average annual concentration," other than for fecal coliform bacteria, is the sum of
the concentrations of all daily discharges sampled and/or measured during a calendar
year on which daily discharges are sampled and measured divided by the number of
daily discharges sampled and/or measured during such year (arithmetic mean of the
daily concentration values). The daily concentration value is equal to the concentration
of a composite sample or in the case of grab samples is the arithmetic mean (weighted
by flow value) of all the samples collected during that calendar day . The average yearly
count for fecal coliform bacteria is the geometric mean of the counts for samples
collected during a calendar year. This limitation is identified as "Annual Average" under
"Other Limits" in Part I of the permit
e. The "daily average concentration" (for dissolved oxygen) is the minimum allowable
amount of dissolved oxygen required to be available in the effluent prior to discharge
averaged over a calendar day. If only one dissolved oxygen sample is taken over a
calendar day, the sample is considered to be the "daily average concentration" for the
discharge. It is identified as "daily average" in the text of Part I.
The "quarterly average concentration" is the average of all samples taken over a
calendar quarter. It is identified as "Quarterly Average Limitation" in the text of Part I
of the permit.
g. A calendar quarter is defined as one of the following distinct periods: January through
March, April through June, July through September, and October through December.

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7. Other Measurements
a. Flow, (MGD): The flow limit expressed in this permit is the 24 hours average flow,
averaged monthly It is determined as the arithmetic mean of the total daily flows
recorded during the calendar month
b An "instantaneous flow measurement" is a measure of flow taken at the time of
sampling, when both the sample and flow will be representative of the total discharge
c. A "continuous flow measurement" is a measure of discharge flow from the facility which
occurs continually without interruption throughout the operating hours of the facility
Flow shall be monitored continually except for the infrequent times when there may be
no flow or for infrequent maintenance activities on the flow device
8 Types of Samples
a Composite Sample: A composite sample shall consist of -
(1) a series of grab samples collected at equal time intervals over a 24 hour period of
discharge and combined proportional to the rate of flow measured at the time of
individual sample collection, or
(2) a series of grab samples of equal volume collected over a 24 hour period with the
time intervals between samples determined by a preset number of gallons passing
the sampling point. Flow measurement between sample intervals shall be
determined by use of a flow recorder and totalizer, and the present gallon interval
between sample collection fixed at no greater than 1/24 of the expected total daily
flow at the treatment system, or
(3) a single, continuous sample collected over a 24 hour period proportional to the rate
of flow.
In accordance with (1) above, the time interval between influent grab samples shall be
no greater than once per hour, and the time interval between effluent grab samples
shall be no greater than once per hour except at wastewater treatment systems having a
detention time of greater than 24 hours. In such cases, effluent grab samples may be
collected at time intervals evenly spaced over the 24 hour period which are equal in
number of hours to the detention time of the system in number of days. However, in no
case may the time interval between effluent grab samples be greater than six (6) hours
nor the number of samples less than four (4) during a 24 hour sampling period.
b. Grab Sample: Grab samples are individual samples collected over a period of time not
exceeding 15 minutes; the grab sample can be taken manually. Grab samples must be
representative .of the discharge or the receiving waters
9. Calculation of Means
a Arithmetic Mean- The arithmetic mean of any set of values is the summation of the
individual values divided by the number of individual values.
b. Geometric Mean: The geometric mean of any set of values is the Nth root of the product
of the individual values where N is equal to the number of individual values. The
geometric mean is equivalent to the antilog of the arithmetic mean of the logarithms of
the individual values. For purposes of calculating the geometric mean, values of zero (0)
shall be considered to be one (1).
c Weighted by Flow Value: Weighted by flow value means the summation of each
concentration times its respective flow divided by the summation of the respective flows.

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10. Calendar Day
A calendar day is defined as the period from midnight of one day until midnight of the next
day However, for purposes of this permit, any consecutive 24-hour period that reasonably
represents the calendar day may be used for sampling
11 Hazardous Substance
A hazardous substance means any substance designated under 40 CFR Part 116 pursuant
to Section 311 of the Clean Water Act.
12. Toxic Pollutant
A toxic pollutant is any pollutant listed as toxic under Section 307(a)(1) of the Clean Water
Act
13. Best Management Practices (BMPs)
Schedules of activities, prohibitions of practices, maintenance procedures, and other
management practices to prevent or reduce the pollution of waters of the United States.
BMPs also include treatment requirements, operation procedures, and practices to control
plant site runoff, spillage or leaks, sludge or waste disposal, or drainage from raw material
storage
14 Bulk Storage of Liquid Products
Liquid raw materials (excluding water), manufactured
products with a single above g-ound storage container
660 gallons or with multiple above ground storage
capacity of greater than 1,320 gallons.
15. Coal Pile Runoff
The rainfall runoff from or through any coal storage pile.
16. Landfill
products, waste materials or by -
having a capacity of greater than
containers having a total storage
A disposal facility or part of a disposal facility where waste is placed in or on land and
which is not a land treatment facility, a surface impoundment, an injection well, a
hazardous waste long-term storage facility or a surface storage facility.
17. Representative Storm Event
A storm event that measures greater than 0 1 inches of rainfall and that is preceded by at
least 72 hours in which no storm event measuring greater than 0.1 inches has occurred. A
single storm event may contain up to 10 consecutive hours of no precipitation. For
example, if it rains for 2 hours without producing any collectable discharge, and then stops,
a sample may be collected if a rain producing a discharge begins again within the next 10
hours.
18. Runoff Coefficient
The fraction of total rainfall that is not infiltrated into or otherwise retained by the soil,
concrete, asphalt or other surface upon which it falls that will appear at the conveyance as
runoff.

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19 Secondary Containment
Spill containment for the contents of the single largest tank within the containment
structure plus sufficient freeboard to allow for the 25 -year, 24-hour storm event
20 Section 313 Water Priority Chemical
A chemical or chemical category which:
a. Is listed in 40 CFR 372 65 pursuant to Section 313 of Title III of the Superfund
Amendments and Reauthorization Act (SARA) of 1986, also titled the Emergency
Planning and Community Right -to -Know Act of 1986,
b Is present at or above threshold levels at a facility subject to SARA title III, Section 313
reporting requirements, and
c. That meet at least one of the following criteria -
(1) Is listed in appendix D of 40 CFR part 122 on either Table II (organic priority
pollutants), Table III (certain metals, cyanides, and phenols) or Table IV (certain
toxic pollutants and hazardous substances);
(2) Is listed as a hazardous substance pursuant to section 311(b)(2)(A) of the CWA at 40
CFR 116 4; or
(3) Is a pollutant for which EPA has published acute or chronic water quality criteria.
21. Sij�mficant Materials
Includes, but is not limited to: raw materials; fuels; materials such as solvents, detergents,
and plastic pellets, finished materials such as metallic products, raw materials used in food
processing or production, hazardous substances designated under section 101(14) of
CERCLA, any chemical the facility is required to report pursuant to section 313 of Title III
of SARA; fertilizers, pesticides, and waste products such as ashes, slag and sludge that
have the potential to be released with stormwater discharges
22 Significant Spills
Includes, but is not limited to: releases of oil or hazardous substances in excess of
reportable quantities under section 311 of the Clean Water Act (Ref: 40 CFR 110.10 and
CFR 117 21) or section 102 of CERCLA (Ref: 40 CFR 302.4).
23. Stormwater Runoff
The flow of water which results from precipitation and which occurs immediately following
rainfall or as a result of snowmelt.
24. Stormwater Associated with Industrial Activity
The discharge from any point source which is used for collecting and conveying stormwater
and which is directly related to manufacturing, processing or raw material storage areas at
an
industrial site. The term does not include discharges from facilities or activities excluded
from the NPDES program.
The following categories of facilities are considered to be engaging in "industrial
activity"

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a. Facilities subject to stormwater effluent limitations guidelines, new source performance
standards, or toxic pollutant effluent standards under 40 CFR Subchapter N, Parts 400-
471 (except facilities which are exempted under (k) of this definition),
b Facilities classified as Standard Industrial Classifications 24 (except 2434), 26 (except
265 and 267), 28, 29, 30, 311, 32, 33, 3441, 373,
Facilities classified as Standard Industrial Classifications 10 through 14 (rrimeral
industry) including active or -Inactive mining operations (except for areas of coal mining
operations meeting the definnion of a reclamation area under 40 CFR 434 11 (1)) and oil
and gas exploration, production, processing, or treatment operations, or transmission
facilities that discharge stormwater contaminated by contact with or that has come in
contact with, any overburden, raw material, intermediate products, finished products,
byproducts or waste products located on the site of such operations; inactive mining
operations are mining sites that are not being actively mined, but which have an
identifiable owner/operator,
d Hazardous waste treatment, storage, or disposal facilities, including those that are
operating under interim status or a permit under Subtitle C of RCRA;
e Landfills, land application sites, and open dumps that receive or have received any
industrial wastes (waste that is received from any of the facilities described under this
definition) including those that are subject to regulation under Subtitle D of RCRA;
Facilities involved in the recycling of materials, including metal scrapyards, battery
reclaimers, salvage yards and automobile junkyards, including but limited to those
classified as Standard Industrial Classification 5015 and 5093;
g Steam electric power generating facilities, including coal handling sites;
h Transportation- facilities classified as Standard Industrial Classifications 40, 41, 42, 44,
and 45 which have vehicle maintenance shops, equipment cleaning operations, or
airport deicing operations Only those portions of the facility that are either involved in
vehicle maintenance (including vehicle rehabilitation, mechanical repairs, painting,
fueling and lubrication), equipment cleaning operations, airport deicing operations, or
which are otherwise identified under (a) -(g) or (i) -(k) of this definition are associated with
industrial activity,
i. Treatment works treating domestic sewage or any other sewage sludge or wastewater
treatment device or system, used in the storage treatment, recycling, and reclamation of
municipal or domestic sewage, including lands dedicated to the disposal of sewage
sludge that are located within the confines of the facility, with a design flow of 1.0 mgd
or more, or required to have an approved pretreatment program under 40 CFR part 403.
Not included are farm lands, domestic gardens or lands used for sludge management
where sludge is beneficially reused and which are not physically located in the confines
of the facility, or areas that are in compliance with section 405 of the CWA;
�. Construction activity including clearing, grading and excavation activities except:
operations that result in the disturbance of less that five acres of total land area which
are not part of a larger common plan of development or sale;
k. Facilities under Standard Industrial Classifications 20, 21, 22, 23, 2434, 25, 265, 267,
27, 283, 285, 30, 31 (except 311), 323, 34 (except 3441), 35, 36, 37 (except 373), 38, 39,
4221-25, (and which are not otherwise included within (a) -U) of this definition).
For the categories of industries identified in (a) through U) of this definition the term
includes, but is not limited to, stormwater discharges from industrial plant yards;
immediate access roads and rail lines used or traveled by carriers of raw materials,

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manufactured products, waste material, or by-products used or created by the facility,
material handling sites, refuse sites, sites used for the application or disposal of process
wastewaters, sites used for the storage and maintenance of material handling equipment,
sites used for residual treatment, storage, or disposal, shipping and receiving areas,
manufacturing buildings, storage areas (including tank farms) for raw materials, and
intermediate and finished products, and areas where industrial activity has taken place in
the past and significant materials remain and are exposed to stormwater For the
categories of industries identified in (k), the term includes only stormwater discharges from
all areas listed in the previous sentence (except access roads) where material handling
equipment or activities, raw material, intermediate products, final products, waste material,
by-products, or industrial machinery are exposed to stormwater.
Material handling activities include the: storage, loading and unloading, transportation, or
conveyance of any raw material, intermediate product, finished product, by-product or
waste product. The term excludes areas located on plant lands separated from the plant's
industrial activities, such as office buildings and accompanying parking lots as long as the
drainage from the excluded areas is not mixed with stormwater drained from the above
described areas
Industrial facilities (including industrial facilities that are Federally or municipally owned or
operated that meet the description of the facilities listed in (a) -(k)) include those facilities
designated under 40 CFR 122 26(a) (1) (v)
25. Ten Year Design Storm
The precipitation event of a duration which will produce the maximum peak rate of runoff
for the watershed of interest resulting from a rainfall event of an intensity expected to be
equaled or exceeded, on the average, once in ten years.
26. Total Flow
The flow corresponding to the time period over which the sample collection occurs The
total flow calculated based on the size of the area draining to the outfall, the amount of the
built -upon (impervious) surfaces within the drainage area, and the total amount of rainfall
occurring during the sampling period
27. Vehicle Maintenance Activity
Vehicle rehabilitation, mechanical repairs, painting, fueling, lubrication, vehicle cleaning
operations, or airport deicing operations.
28. Visible Sedimentation
Solid particulate matter, both mineral and organic, that has been or is being transported by
water, air, gravity, or ice from its site of origin which can be seen with the unaided eye.
29. Waste Pile
Any non -containerized accumulation of solid, non -flowing waste that is used for treatment
or storage
SECTION B. GENERAL CONDITIONS
1 Duty to Comp

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The permittee must comply with all conditions of this permit. Any permit noncompliance
constitutes a violation of the Clean Water Act and is grounds for enforcement action, for
permit termination, revocation and reissuance, or modification; or denial of a pernut
renewal application.
a. The permittee shall comply with effluent standards or prohibitions established under
section 307(a) of the Clean Water Act for toxic pollutants and with standards for sewage
sludge use or disposal established under section 405(d) of the Clean Water Act within
the time provided in the regulations that establish these standards or prohibitions or
standards for sewage sludge use or disposal, even if the permit has not yet been
modified to incorporate the requirement.
b. The Clean Water Act provides that any person who violates a permit condition is subject
to a civil penalty not to exceed $25,000 per day for each violation. Any person who
negligently violates any permit condition is subject to criminal penalties of $2,500 to
$25,000 per day of violation or imprisonment for not more than 1 year, or both. Any
person who knowingly violates permit conditions is subject to criminal penalties of
$5,000 to $50,000 per day of violation, or imprisonment for not more than 3 years, or
both. Also, any person who violates a permit condition may be assessed an
administrative penalty not to exceed $10,000 per violation with the maximum amount
not to exceed $125,000. [Ref: Section 309 of the Federal Act 33 U.S C. 1319 and 40
CFR 122 41 (a)]
c. Under state law, a civil penalty of not more than ten thousand dollars ($10,000) per
violation may be assessed against any person who violates or fails to act in accordance
with the terms, conditions, or requirements of a permit [Ref. North Carolina General
Statutes § 143-215 6A]
d Any person may be assessed an administrative penalty by the Administrator for
violating section 301, 302, 306, 307, 308, 318, or 405 of the Act, or any permit
condition or limitation implementing any of such sections in a permit issued under
section 402 of the Act. Administrative penalties for Class I violations are not to exceed
$10,000 per violation, with the maximum amount of any Class I penalty assessed not to
exceed $25,000. Penalties for Class II violations are not to exceed $10,000 per day for
each day during which the ,solation continues, with the maximum amount of any Class
II penalty not to exceed $125,000.

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2. Duty to Mitigate
The permittee shall take all reasonable steps to minimize or prevent any discharge or sludge
use or disposal in violation of this permit which has a reasonable likelihood of adversely
affecting human health or the environment.
3. Civil and Criminal Liability
Except as provided in permit conditions on 'Bypassing" (Part II, C-4) and 'Power Failures"
(Part II, C-7), nothing in this permit shall be construed to relieve the permittee from any
responsibilities, liabilities, or penalties for noncompliance pursuant to NCGS 143-215.3,
143-215.6 or Section 309 of the Federal Act, 33 USC 1319. Furthermore, the permittee is
responsible for consequential damages, such as fish kills, even though the responsibility for
effective compliance may be temporarily suspended.
4. Oil and Hazardous Substance Liability
Nothing in this permit shall be construed to preclude the institution of any legal action or
relieve the permittee from any responsibilities, liabilities, or penalties to which the permittee
is or may be subject to under NCGS 143-215 75 et seq. or Section 311 of the Federal Act, 33
USG 1321. Furthermore, the permittee is responsible for consequential damages, such as
fish kills, even though the responsibility for effective compliance may be temporarily
suspended.
5 Property Rights
The issuance of this permit does not convey any property rights in either real or personal
property, or any exclusive privileges, nor does it authorize any injury to private property or
any invasion of personal rights, nor any infringement of Federal, State or local laws or
regulations.
6. Onshore or Offshore Construction
This permit does not authorize or approve the construction of any onshore or offshore
physical structures or facilities or the undertaking of any work in any navigable waters.
7. Severabilitv
The provisions of this permit are severable, and if any provision of this permit, or the
application of any provision of this permit to any circumstances, is held invalid, the
application of such provision to other circumstances, and the remainder of this permit,
shall not be affected thereby
8. Duty to Provide Information -
The perrruttee shall furnish to the Permit Issuing Authority, within a reasonable time, any
information which the Permit Issuing Authority may request to determine whether cause
exists for modifying, revoking and reissuing, or terminating this permit or to determine
compliance with this permit. The perrruttee shall also furnish to the Permit Issuing
Authority upon request, copies of records required to be kept by this permit.
9. Duly to Reapply
If the permittee wishes to continue an activity regulated by this permit after the expiration
date of this pernut, the permittee must apply for and obtain a new permit.

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10. Expiration of Permit
The permittee is not authorized to discharge after the expiration date In order to receive
automatic authorization to discharge beyond the expiration date, the permittee shall submit
such information, forms, and fees as are required by the agency authorized to issue permits
no later than 180 days prior to the expiration date Any permittee that has not requested
renewal at least 180 days prior to expiration, or any permittee that does not have a permit
after the expiration and has not requested renewal at least 180 days prior to expiration, will
subject the permittee to enforcement procedures as provided in NCGS 143-215.6 and 33
USC 1251 et. seq
11. Signatory Requirements
All applications, reports, or information submitted to the Permit Issuing Authority shall be
signed and certified
a. All permit applications shall be signed as follows
(1) For a corporation by a responsible corporate officer For the purpose of this
Section, a responsible corporate officer means (a) a president, secretary, treasurer
or vice president of the corporation in charge of a principal business function, or
any other person who pe -forms similar policy or decision making functions for the
corporation, or (b) the manager of one or more manufacturing production or
operating facilities employing more than 250 persons or having gross annual sales
or expenditures exceeding 25 million (in second quarter 1980 dollars), if authority to
sign documents has been assigned or delegated to the manager in accordance with
corporate procedures.
(2) For a partnership or sole proprietorship. by a general partner or the proprietor,
respectively; or
(3) For a municipality, State, Federal, or other public agency- by either a principal
executive officer or ranking elected official
b. All reports required by the permit and other information requested by the Permit
Issuing Authority shall be signed by a person described above or by a duly authorized
representative of that person_ A person is a duly authorized representative only if.
(1) The authorization is made in writing by a person described above,
(2) The authorization specified either an individual or a position having responsibility for
the overall operation of the regulated facility or activity, such as the position of
plant manager, operator of a well or well field, superintendent, a position of
equivalent responsibility, or an individual or position having overall responsibility
for environmental matters for the company. (A duly authorized representative may
thus be either a named individual or any individual occupying a named position.);
and
(3) The written authorization is submitted to the Permit Issuing Authority.
c. Certification. Any person signing a document under paragraphs a. or b. of this section
shall make the following certification:
"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 uersons 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."

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12. Permit Actions
This permit may be modified, revoked and reissued, or terminated for cause The filing of a
request by the permittee for a permit modification, revocation and reissuance, or
termination, or a notification of planned changes or anticipated noncompliance does not
stay any permit condition
13. Permit Modification. Revocation and Reissuance. or Termina
The issuance of this perrrnt does not prohibit the permit issuing authority from reopening
and modifying the permit, revoking and reissuing the permit, or terminating the permit as
allowed by the laws, rules, and regulations contained in Title 40, Code of Federal
Regulations, Parts 122 and 123; Title 15A of the North Carolina Administrative Code,
Subchapter 2H 0100, and North Carolina General Statute 143-215 1 et al.
14. Previous Permits
All previous National Pollutant Discharge Elimination System Permits issued to this facility,
whether for operation or discharge, are hereby revoked by issuance of this permit. [The
exclusive authority to operate this facility arises under this permit. The authority to
operate the facility under previously issued permits bearing this number is no longer
effective. ) The conditions, requirements, terms, and provisions of this permit authorizing
discharge under the National Pollutant Discharge Elimination System govern discharges
from this facility.
SECTION C OPERATION AND MAINTENANCE OF POLLUTION CONTROLS
1. Certified Operator
Pursuant to Chapter 90A-44 of North Carolina General Statutes, and upon classification of
the facility by the Certification Commission, the permittee shall employ a certified
wastewater treatment plant operator in responsible charge (ORC) of the wastewater
treatment facilities. Such operator must hold a certification of the grade equivalent to or
greater than the classification assigned to the wastewater treatment facilities by the
Certification Commission. The permittee must also employ a certified back-up operator of
the appropriate type and any grade to comply with the conditions of Title 15A NCAC
Chapter 8G 0200 The ORC of the facility must visit each Class I facility at least weekly
and each Class II, III, and IV facility at least daily, excluding weekends and holidays, and
must properly manage and document daily operation and maintenance of the facility and
must comply with all other conditions of Title 15A, NCAC Chapter 8G .0200 Once the
facility is classified, the permittee shall submit a letter to the Certification Comrmssion
which designates the operator in responsible charge within thirty days after the wastewater
treatment facilities are 50% complete.
2. Proper Operation and Maintenance
The permittee shall at all times properly operate and maintain all facilities and systems of
treatment and control (and related appurtenances) which are installed or used by the
permittee to achieve compliance with the conditions of this permit Proper operation and
maintenance also includes adequate laboratory controls and appropriate quality assurance
procedures. This provision requires the operation of back-up or auxiliary facilities or
similar systems which are installed by a permittee only when the operation is necessary to
achieve compliance with the conditions of the permit.

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3. Need to Halt or Reduce not a Defense
It shall not be a defense for a permittee in an enforcement action that it would have been
necessary to halt or reduce the permitted activity in order to maintain compliance with the
condition of this permit
4. Bypassing of Treatment Facilities
a. Definitions
(1) 'Bypass" means the known diversion of waste streams from any portion of a
treatment facility incluchng the collection system, which is not a designed or
established or operating mode for the facility.
(2) "Severe property damage" means substantial physical damage to property, damage
to the treatment facilities which causes them to become inoperable, or substantial
and permanent loss of natural resources which can reasonably be expected to occur
in the absence of a bypass Severe property damage does not mean economic loss
caused by delays in production.
b Bypass not exceeding limitations.
The permittee may allow any bypass to occur which does not cause effluent limitations
to be exceeded, but only if it also is for essential maintenance to assure efficient
operation. These bypasses are not subject to the provisions of Paragraphs c and d of
this section.
c. Notice
(1) Anticipated bypass. If the permittee knows in advance of the need for a bypass, it
shall submit prior notice. if possible at least ten days before the date of the bypass,
including an evaluation of the anticipated quality and affect of the bypass.
(2) Unanticipated bypass. The permittee shall submit notice of an unanticipated bypass
as required in Part II, E 6. of this permit. (24 hour notice).
d Prohibition of Bypass
(1) Bypass is prohibited and the Permit Issuing Authority may take enforcement action
against a permittee for bypass, unless:
(A) Bypass was unavoidable to prevent loss of life, personal injury or severe property
damage,
(B) There were no feasible alternatives to the bypass, such as the use of auxiliary
treatment facilities, retention of untreated wastes or maintenance during normal
periods of equipment downtime This condition is not satisfied if adequate backup
equipment should have been installed in the exercise of reasonable engineering
judgment to prevent a bypass which occurred during normal periods of equipment
downtime or preventive maintenance; and
(C) The permittee submitted notices as required under Paragraph c. of this section.
(2) The Permit Issuing Authority may approve an anticipated bypass, after considering
its adverse affects, if the Permit Issuing Authority determines that it will meet the
three conditions listed ahove in Paragraph d. (1) of this section.

Boilerplate Part II
Page 13 of 18
5. Upsets
a. Definition
"Upset " means an exceptional incident in which there is unintentional and temporary
noncompliance with technology based permit effluent limitations because of factors
beyond the reasonable control of the permittee An upset does not include
noncompliance to the extent caused by operational error, improperly designed treatment
facilities, inadequate treatment facilities, lack of preventive maintenance, or careless or
improper operation
b. Effect of an upset.
An upset constitutes an affirmative defense to an action brought for noncompliance
with such technology based permit effluent limitations if the requirements of paragraph
c of this condition are met No determination made during administrative review of
claims that noncompliance was caused by upset, and before an action for
noncompliance, is final administrative action subject to judicial review.
c Conditions necessary for a demonstration of upset.
A permittee who wishes to establish the affirmative defense of upset shall demonstrate,
through properly signed, contemporaneous operating logs, or other relevant evidence
that.
(1) An upset occurred and that the permittee can identify the cause(s) of the upset,
(2) The permittee facility was at the time being properly operated, and
(3) The permittee submitted notice of the upset as required in Part II, E 6. (b) (B) of this
permit
(4) The permittee complied with any remedial measures required under Part II, B. 2. of
this permit.
d. Burden of proof.
In any enforcement proceeding the permittee seeking to establish the occurrence of an
upset has the burden of proof.
6. Removed Substances
Solids, sludges, filter backwash, or other pollutants removed in the course of treatment or
control of wastewaters shall be utilized/ disposed of in accordance with NCGS 143-215.1 and
in a manner such as to prevent any pollutant from such materials from entering waters of
the State or navigable waters of the United States. The permittee shall comply with all
existing federal regulations governing the disposal of sewage sludge Upon promulgation of
40 CFR Part 503, any perrmt issued by the Permit Issuing Authority for the
utilization/ disposal of sludge may be reopened and modified, or revoked and reissued, to
incorporate applicable requirements at 40 CFR Part 503. The permittee shall comply with
applicable 40 CFR Part 503 Standards for the Use and Disposal of Sewage Sludge (when
promulgated) within the time provided in the regulation, even if the permit is not modified
to incorporate the requirement. The permittee shall notify the Permit Issuing Authority of
any significant change in its sludge use or disposal practices.
7. Power Failures
The permittee is responsible for maintaining adequate safeguards as required by DEM
Regulation, Title 15A, North Carolina Administrative Code, Subchapter 2H, .0124 Reliability,
to prevent the discharge of untreated or inadequately treated wastes during electrical power

Boilerplate Part II
Page 14 of 18
failures either by means of alternate power sources, standby generators or retention of
inadequately treated effluent.
SECTION D. MONITORING AND RECORDS
I. Representative Sampling
Samples collected and measurements taken, as required herein, shall be characteristic of
the volume and nature of the permitted discharge. Samples collected at a frequency less
than daily shall be taken on a day and time that is characteristic of the discharge over the
entire period which the sample represents. All samples shall be taken at the monitoring
points specified in this permit and, unless otherwise specified, before the effluent loins or is
diluted by any other wastestream, body of water, or substance. Monitoring points shall not
be changed without notification to and the approval of the Permit Issuing Authority.
2. Reporting
Monitoring results obtained durnng the previous month(s) shall be summarized for each
month and reported on a monthly Discharge Monitoring Report (DMR) Form (DEM No. MR
1, 11, 2, 3) or alternative forms approved by the Director, DEM, postmarked no later than
the 30th day following the completed reporting period.
The first DMR is due on the last day of the month following the issuance of the permit or in
the case of a new facility, on the last day of the month following the commencement of
discharge. Duplicate signed copies of these, and all other reports required herein, shall be
subrrutted to the following address:
Division of Water Quality
Water Quality Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
3. Flow Measurements
Appropriate flow measurement devices and methods consistent with accepted scientific
practices shall be selected and used to ensure the accuracy and reliability of measurements
of the volume of monitored discharges. The devices shall be installed, calibrated and
maintained to ensure that the accuracy of the measurements are consistent with the
accepted capability of that type of device. Devices selected shall be capable of measuring
flows with a maximum deviation of less than 10% from the true discharge rates throughout
the range of expected discharge volumes. Once -through condenser cooling water flow
which is monitored by pump logs, or pump hour meters as specified in Part I of this pernut
and based on the manufacturer's pump curves shall not be subject to this requirement.
4. Test Procedures
Test procedures for the analysis of pollutants shall conform to the EMC regulations
published pursuant to NCGS 143-215.63 et. seq, the Water and Air Quality Reporting Acts,
and to regulations published pursuant to Section 304(8), 33 USC 1314, of the Federal
Water Pollution Control Act, as Amended, and Regulation 40 CFR 136; or in the case of
sludge use or disposal, approved under 40 CFR 136, unless otherwise specified in 40 CFR
503, unless other test procedures have been specified in this permit.
To meet the intent of the monitoring required by this permit, all test procedures must
produce minimum detection and reporting levels that are below the permit discharge
requirements and all data generated must be reported down to the minimum detection or
lower reporting level of the procedure. If no approved methods are determined capable of

achieving minimum detection an
then the most sensitive (method
approved method must be used.
5 Penalties for Tampering
Boilerplate Part II
Page 15 of 18
d reporting levels below permit discharge requirements,
with the lowest possible detection and reporting level)
The Clean Water Act provides that any person who falsifies, tampers with, or knowingly
renders inaccurate, any monitoring device or method required to be maintained under this
permit shall, upon conviction, be punished by a fine of not more than $10,000 per violation,
or by imprisonment for not more than two years per violation, or by both. If a conviction of
a person is for a violation committed after a first conviction of such person under this
paragraph, punishment is a fine of not more than $20,000 per day of violation, or by
imprisonment of not more than 4 years, or both.
6. Records Retention
Except for records of monitoring information required by this permit related to the
permittee's sewage sludge use and disposal activities, which shall be retained for a period of
at least five years (or longer as required by 40 CFR 503), the permittee shall retain records
of all monitoring information, including all calibration and maintenance records and all
original strip chart recordings for continuous monitoring instrumentation, copies of all
reports required by this permit, for a period of at least 3 years from the date of the sample,
measurement, report or application. This period may be extended by request of the
Director at any time.
7. Recordinp, Results
For each measurement or sample taken pursuant to the requirements of this permit, the
pe=ttee shall record the following information:
a. The date, exact place, and time of sampling or measurements;
b. The individual(s) who performed the sampling or measurements;
c. The date(s) analyses were performed;
d. The individual(s) who performed the analyses;
e. The analytical techniques or methods used, and
f. The results of such analyses.
8. Inspection and Entry
Tjie permittee shall allow the Director, or an authorized representative (including an
authorized contractor acting as a representative of the Director), upon the presentation of
credentials and other documents as may be required by law, to;
a. Enter upon the permittee's premises where a regulated facility or activity is located or
conducted, or where records must be kept under the conditions of this permit;
b. Have access to and copy, at reasonable times, any records that must be kept under the
conditions of this permit;
c. Inspect at reasonable times any facilities, equipment (including monitoring and control
equipment), practices, or operations regulated or required under this permit; and
d. Sample or monitor at reasonable times, for the purposes of assuring permit compliance
or as otherwise authorized by the Clean Water Act, any substances or parameters at
any location.

Boilerplate Part II
Page 16 of 18
SECTION E. REPORTING REQUIREMENTS
1 Change in Discharge
All discharges authorized herein shall be consistent with the terms and conditions of this
permit. The discharge of any pollutant identified in this permit more frequently than or at a
level in excess of that authorized shall constitute a violation of the permit
2. Planned Changes
The permittee shall give notice to the Director as soon as possible of any planned physical
alterations or additions to the permitted facility. Notice is required only when:
a. The alteration or addition to a permitted facility may meet one of the criteria for
determining whether a facility is a new source in 40 CFR Part 122.29 (b); or
b. The alteration or addition could significantly change the nature or increase the quantity
of pollutants discharged. This notification applies to pollutants which are subject
neither to effluent limitations in the permit, nor to notification requirements under 40
CFR Part 122.42 (a) (1).
c. The alteration or addition results in a significant change in the permittee's sludge use or
disposal practices, and such alternation, addition or change may justify the application
of permit conditions that are different from or absent in the existing permit, including
notification of additional use or disposal sites not reported during the permit application
process or not reported pursuant to an approved land application plan
3. Anticipated Noncompliance
The pernuttee shall give advance notice to the Director of any planned changes in the
permitted facility or activity which may result in noncompliance with permit requirements.
4. Transfers
This permit is not transferable to any person except after notice to the Director. The
Director may require modification or revocation and reissuance of the permittee and
incorporate such other requirements as may be necessary under the Clean Water Act.
5. Momtorinj� Reports
Monitoring results shall be reported at the intervals specified elsewhere in this permit.
a. Monitoring results must be reported on a Discharge Monitoring Report (DMR) (See Part
II. D. 2 of this perrmt)- or forms provided by the Director for reporting results of
monitoring of sludge use or disposal practices.
b. If the permittee monitors any pollutant more frequently than required by the permit,
using test procedures specified in Part II, D. 4. of this permit or in the case of sludge
use or disposal, approved under 40 CFR 503, or as specified in this permit, the results
of this monitoring shall be included in the calculation and reporting of the data
submitted in the DMR.
c. Calculations for all limitations which require averaging of measurements shall utilize an
arithmetic mean unless otherwise specified by the Director in the permit.
6. 'Twenty-four Hour Reporting

Boilerplate Part II
Page 17 of 18
a The permittee shall report to the central office or the appropriate regional office any
noncompliance which may endanger health or the environment Any information shall
be provided orally within 24 hours from the time the permittee became aware of the
circumstances. A written submission shall also be provided within 5 days of the time
the permittee becomes aware of the circumstances The written submission shall
contain a description of the noncompliance, and its cause; the period of noncompliance,
including exact dates and times, and if the noncompliance has not been corrected, the
anticipated time it is expected to continue; and steps taken or planned to reduce,
eliminate, and prevent reoccurrence of the noncompliance.
b The following shall be included as information which must be reported within 24 hours
under this paragraph:
(1) Any unanticipated bypass which exceeds any effluent limitation in the permit.
(2) Any upset which exceeds any effluent limitation in the permit
(3) Violation of a maximum daily discharge limitation for any of the pollutants listed by
the Director in the permit to be reported within 24 hours.
The Director may waive the written report on a case-by-case basis for reports under
paragraph b above of this condition if the oral report has been received within 24
hours
7. Other Noncompliance
The permittee shall report all instances of noncompliance not reported under Part II. E 5
and 6 of this permit at the time monitoring reports are submitted The reports shall
contain the information listed in Part II. E 6 of this permit.
8. Other Information
Where the permittee becomes aware that it failed to submit any relevant facts in a permit
application, or submitted incorrect information in a permit application or in any report to
the Director, it shall promptly submit such facts or information
9. Noncompliance Notification
The permittee shall report by telephone to either the central office or the appropriate
regional office of the Division as soon as possible, but in no case more than 24 hours or on
the next working day following the occurrence or first knowledge of the occurrence of any of
the following:
a. Any occurrence at the water pollution control facility which results in the discharge of
significant amounts of wastes which are abnormal in quantity or characteristic, such as
the dumping of the contents of a sludge digester; the known passage of a slug of
hazardous substance through the facility; or any other unusual circumstances
b. Any process unit failure, due to known or unknown reasons, that render the facility
incapable of adequate wastewater treatment such as mechanical or electrical failures of
pumps, aerators, compressors, etc.
c. Any failure of a pumping station, sewer line, or treatment facility resulting in a by-pass
directly to receiving waters without treatment of all or any portion of the influent to
such station or facility

Boilerplate Part II
Page 18 of 18
Persons reporting such occurrences by telephone shall also file a written report in letter
form within 5 days following first knowledge of the occurrence.
10. Availability of Reports
Except for data determined to be confidential under NCGS 143-215.3(a)(2) or Section 308 of
the Federal Act, 33 USC 1318, all reports prepared in accordance with the terms shall be
available for public inspection at the offices of the Division of Water Quality As required by
the Act, effluent data shall not be considered confidential. Knowingly making any false
statement on any such report may result in the imposition of criminal penalties as provided
for in NCGS 143-215.1(b)(2) or in Section 309 of the Federal Act
11. Penalties for Falsification of Reports
The Clean Water Act provides that any person who knowingly makes any false statement,
representation, or certification in any record or other document submitted or required to be
maintained under this permit, including monitoring reports or reports of compliance or
noncompliance shall, upon conviction, be punished by a fine of not more than $10,000 per
violation, or by imprisonment for not more than two years per violation, or by both

Boilerplate Part III
Page 1 of 1
PART III
OTHER REQUIREMENTS
A Construction
No construction of wastewater treatment facilities or additions to add to the plant's
treatment capacity or to change the type of process utilized at the treatment plant shall be
begun until Final Plans and Specifications have been submitted to the Division of Water
Quality and written approval and Authorization to Construct has been issued
B Groundwater Monitonn
The permittee shall, upon written notice from the Director of the Division of Water Quality,
conduct groundwater monitoring as may be required to determine the compliance of this
NPDES permitted facility with the current groundwater standards.
C. Changes in Discharges of Toxic Substances
The permittee shall notify the Permit Issuing Authority as soon as it knows or has reason to
believe.
a.That any activity has occurred or will occur which would result in the discharge, on a
routine or frequent basis, of any toxic pollutant which is not limited in the permit, if
that discharge will exceed the highest of the following "notification levels",
(1) One hundred micrograms per liter (100 ug/1);
(2)Two hundred micrograms per liter (200 ug/1) for acrolein and acrylonitrile; five
hundred micrograms per liter (500 ug/1) for 2 4-dinitrophenol and for 2 -methyl -4 6-
dinitrophenol; and one milligram per liter (1 mg/1) for antimony;
(3) Five (5) times the maximum concentration value reported for that pollutant in the
permit application.
b. That any activity has occurred or will occur which would result in any discharge, on a
non -routine or infrequent basis, of a toxic pollutant which is not limited in the permit, if
that discharge will exceed the highest of the following "notification levels";
(1) Five hundred micrograms per liter (500 ug/1);
(2) One milligram per liter (1 mg/1) for antimony;
(3) Ten (10) times the maximum concentration value reported for that pollutant in the
permit application

Boilerplate Part IV
Page 1 of 1
PART IV
ANNUAL ADMINISTERING AND COMPLIANCE MONITORING FEE REQUIREMENTS
Section A Fee Requirements
The permittee must pay the annual administering and compliance monitoring fee
within 30 (thirty) days after being billed by the Division. Failure to pay the fee in
a timely manner in accordance with 15A NCAC 2H .0105(b)(4) may cause this
Division to initiate action to revoke the permit.

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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
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ATLANTA FEDERAL CENTER
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REF: 4WM-PGTAB
Mr. Dave Goodrich, Supervisor
NPDES Unit
C f
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1� E S E P 2 8 2000] N ptember 22, 2000
DENR - MATER QUALITY
POINT SOURCE BRANCH
Division of Water Quality
North Carolina Department of Environment and Natural Resources
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
RE: Carolina Power and Light - Mayo Steam Electric Power Plant
NPDES Permit No. NCO038377
Dear Mr. Goodrich:
This letter is in response to your letter dated June 23, 2000, regarding the Environmental
Protection Agency's (EPA) letter of September 18, 1997, listing potential objections to the
referenced National Pollutant Discharge Elimination System (NPDES) permit. This letter is
intended to provide a reply.
After careful consideration of the core issues regarding impediments to the issuance of the
above referenced permit, EPA is withdrawing our objections to the use of the 1982 New Source
Performance Standards (1982 NSPS) instead of the 1974 Standards of Performance for New
Sources (1974 SPNS) within this permit as drafted. EPA has also determined that the inclusion of
the 1982 NSPS in the Carolina Power and Light - Mayo Steam Electric Power Plant Permit does
not violate the anti -backsliding regulations at 40 CFR §,122.44(1).
If I may be of further assistance, please feel free to contact me or Caroline Ejimofor, of my
staff, at 404-562-9309.
Sincerely,
osevelt Childress, Acting Chief
ermiis, Grants & Technical Assistance Branch
Water Management Division
cc: Carolina Power and Light
Kevin Smith, EAD

State of North Carolina
Department of Environment
and Natural Resources •
Division of Water Quality
James B. Hunt, Jr., Governor
BIII Holman, Secretary NCDENR
Kerr T. Stevens, Director
June 23, 2000
Mr. Roosevelt Childress, Chief
Surface Water Permits Section
Water Management Division
U S Environmental Protection Agency, Region IV
Atlanta Federal Center
100 Alabama Street S W.
Atlanta, Georgia 30303-3104
Subject: NPDES Permit No. NCO038377
Carolina Power and Light
Mayo Steam Electric Power Plant
Dear Mr Childress.
The Division of Water Quality (Division) sent the subject draft permit to public notice on 07/21/97 By
letter dated 09/18/97, EPA Region IV raised several objections which they indicated must be corrected
prior to permit reissuance. Since that time, this permit has remained on our backlog The intent of this
letter is to respond to the EPA objections, and ultimately reissue the permit and reduce the backlog
EPA CORE OBJECTION
The CP&L Mayo Steam Electric Power Plant is subject to EPA Steam Electric Effluent Guidelines per 40
CFR 423 The core issue raised by EPA pertains to whether the CP&L Mayo plant should be regulated
by the 1974 Standards of Performance for New Sources (1974 SPNS, now NSPS), or be regulated to
reflect the requirements of the subsequent 1982 regulations. EPA contends that since the plant was in
construction prior to the 1982 NSPS (with commercial operation beginning in March 1983), the 1974
SPNS should still apply. EPA is therefore objecting to the subject draft permit which is based on the
1982 regulations.
1617 Mad Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer Visit us on the INTERNET @ www enr.state nc.us

Permit No. NCO038377
CP&L- Mayo Steam
Page 2
Response The Division believes that the current draft permit is consistent with applicable regulations for
the following reasons•
• When 40 CFR 423 was promulgated in 1982, the preamble stated that the 1982 regulations contain
both the 1974 and the 1977 limitations that EPA did not change, and the revised limitations that are
the subject of the 1982 regulations [47 FR 52292, 11/19/821. Consequently, the 1982 regulations
reflect a consolidation of both the 1974 and 1982 regulations and any NPDES permits written must
conform to the 1982 promulgated regulations
• 40 CFR 125 3 (c)(1) states that technology-based effluent limitations are not applicable to the extent
that they have been remanded or withdrawn The preamble to the 1982 regulations states that the
1974 SPNS for Bottom Ash transport water and the segregated boiler blowdown source were
withdrawn. Consequently, with the promulgation of the 1982 regulations, the 1974 SPNS lost their
legal applicability within the 40 CFR 423 regulations and the NPDES program in general
• Although the EPA has cited several Headquarter's policy memos in support of their position, their
regulatory argument, as required by 40 CFR 123.44, is primarily based on EPA's anti -backsliding
regulations However, anti -backsliding is not relevant to this situation The anti -backsliding
regulations at 40 CFR 122 44(1) prohibit (with exceptions) a reissued permit from having effluent
linutations that are less stringent than those in the previous permit However, in this case no
relaxation of the effluent linutations in the previous permit is being proposed The subject draft
permit contains essentially the same hrmtations as the previous permit that was effective 02/01/96
The linutations in the previous permit were appropriately based on the 1982 revisions to the Steam
Electric Guidelines Additionally, the two modified versions of the permit (September 1985 and
January 1986) that immediately preceded the 1996 pernut were also appropriately based on the 1982
revisions to the Steam Electric Guidelines

Permit No. NCO038377
CP&L- Mayo Steam
Page 3
EPA SPECIFIC OBJECTIONS
The EPA submitted six specific objections to the draft permit, which are presented below along with the
Division's responses
EPA Comment #1 Mass linutations are required in the permit by the 1974 SPNS We recommend that
flow -weighted concentration limitations consistent with the "Guidance for NPDES Permits Issued to
Steam Electric Power Plants" signed by Ms Rebecca Hammer on 08/22/85 be included in the permit also
Response As stated previously, it is the Division's belief that the exclusive 1974 SPNS requirements are
no longer the regulations of record as they were superseded by the 1982 regulations The preamble to the
1982 regulations states that the 1982 regulation[s] "allows the permitting authority to establish either
concentration or mass limits for any effluent limitation or standard, based on the concentrations specified
in the regulations " [47 FR 52293] Also, EPA agrees that "the use of mass based limits in all
circumstances is undesirable" [47 FR 52300] Accordingly the Division has exercised their option of
writing the subject draft permit with concentration based limitations because with concentration based
linutations the pollutants must be controlled at any discharge flow
Comment #2 Reduction in limitations to include bottom ash recycle under 1974 SPNS (if applicable)
The limitations developed for the bottom ash component of the discharge (OSN 002) should be divided
by a factor of 20
Response The 1974 SPNS are not applicable The 1974 SPNS recycle requirement for 20 cycles of
bottom ash sluice water was specifically withdrawn as stated in the preamble to the 1982 regulations [47
FR 52296] Therefore, according to 40 CFR 125 3 (c)(1) if a technology based limitation has been
withdrawn, it is no longer applicable The reasoning provided for the EPA initiated withdrawal was, in
part, that "a recycle system for bottom ash is substantially more expensive than other bottom ash
handling systems" and "the `reasonableness' of [a 20X recycle system] using the cost tests for
conventional pollutants ..did not pass the BCT test " [45 FR 68328, 68338-9]

Permit No. NCO038377
CP&L- Mayo Steam
Page 4
Comment #3: Discharge of pollutants in cooling tower blowdown is limited by both the 1974 SPNS and
1982 BAT standards Accordingly, the discharge of corrosion inhibitors and the 126 priority pollutants
(including chromium, zinc, and phosphorus) in detectable amounts are prohibited
Response As previously explained, the 1982 regulations reflect a consolidation of both the 1974 and
1982 regulations Therefore the 1982 regulations are the current regulations of use Additionally, the
preamble to the 1982 regulations states that the final BAT and NSPS limits for cooling tower blowdown
allow for the discharge of chromium and zinc (based upon concentrations of 0 2 mg/l and 10 mg/1,
respectively), and the limit for phosphorus is deleted [47 FR 52295]
Comment #4• Mass (and concentration) limitations attributable to coal pile runoff and cooling tower
blowdown, and other sources of dilution flow must be incorporated into the ash pond limitations (See
Aug 22, 1985 Hammer Guidance)
Response- As indicated in the response to Comment #1, flexibility exists for mass or concentration
limits In regard to other sources of dilution flow, the proposed pernut can be reevaluated in this light
Comment #5• 'Boiler Blowdown" is a separate category from low volume wastes under 1974 SPNS.
Response The 1974 SPNS are not applicable The 1974 SPNS for boiler blowdown were specifically
withdrawn as stated in the preamble to the 1982 regulations [47 FR 52297] According to 40 CFR 125 3
(c)(1) if a technology based limitation has been withdrawn, it is no longer applicable
Comment #6 Both chemical and non -chemical metal cleaning wastes are subject to performance
standards for metal cleaning wastes Although these wastes are not indicated in the application, they are
generally present at steam electric power plants, unless disposed of in an offsite (sic).
Response- Chemical metal cleaning wastes are currently incinerated The Division will reexamine non-
chenucal metal cleaning wastes
OTHER CONSIDERATIONS
Environmental
The viewpoint of James R. Patrick Jr , previous Chief, EPA Permits Section, was that "the environmental
benefits of the 1974 NSPS over the 1982 NSPS are minimal" (in letter dated 2/12/92 to James H
Scarbrough, Chief, EPA Water Permits and Enforcement Branch). The Division concurs with this
opinion.

• Permit No. NCO038377
CP&L- Mayo Steam
Page 5
Economic
Although the environmental benefits are considered minimal, the cost of compliance with the 1974
regulations for the permittee would not be minimal For example, in order to approach compliance with
dust the 1974 bottom ash recycling requirements, the following costs have been estimated
• Capital Material Cost, estimate for installation - $1,353,900
• Capital Installation Cost, estimate including engineering package, labor, civil work - $2,100,000.
• O&M for the above installation would be $1,950,000 for each five year period
• 3 megawatt loss in generation
These costs do not address the additional potential costs necessary to comply with the other aspects of the
1974 regulations as presented in your letter
In conclusion, the Division is certainly agreeable to reexamining the permitting concerns expressed in
comments 4 and 6. After those issues are addressed, the Division believes that the subject draft permit
should proceed to reissuance We do not believe that the permitted facility should be subject to
regulations which have been withdrawn for almost 18 years We also believe that there is no backsliding
of effluent limitations between the draft permit and the previous permit We will continue to work with
you to resolve these objections If you require any additional information about this permit, please do not
hesitate to contact me at (919)-733-5083 extension 517, or Tom Belmck at extension 543.
Sincerely,
David A Goodrich
NPDES Unit Supervisor
cc: NPDES Unit, Permit File
Coleen Sullins, DWQ
Bill Reid, DWQ
Doug Mundrick, U S EPA, Water Management Division
Mike McGhee, U S EPA
Mick Greeson, CP&L
Fred Holt, CP&L

EPA onogh 66 q7 UPH�/per \
z�,u UNITED STATES ENVIRONMENTAL PROTECTION AGENCYKm
W REGION 4
o Q ATLANTA FEDERAL CENTER
y�Fo= 100 ALABAMA STREET, S W
tiitPR0111� ATLANTA, GEORGIA 30303-3104
SEP 18 1997
REF: 4WM-SWPFB
Mr. Steve Tedder, Chief
Water Quality Section
Division of Water Quality
NC Dept. of Environment, Health,
and Natural Resources
P.O. Box 29535
Raleigh, North Carolina 27626-0535
RE: NPDES Overview
Carolina Power & Light Co.
Mayo Electric Generating Plant
NPDES Permit No. NCO038377
Dear Mr. Tedder:
In accordance with the EPA/DWQ MOA, we have completed our
review of the draft National Pollutant Discharge permit and
supporting materials received on August 5, 1997, for the
referenced facility and our comments are provided below. These
comments were necessary in order to ensure that the permit
complies with the applicable regulations and guidance. Unless
appropriate changes are made, the permit may be subject to an EPA
veto.
Our comments generally remain the same as those provided to
your office during previous permit reissuances. Reference is
made to our letter dated November 4, 1987 and reiterated in Mr.
James Elder's memorandum regarding New Source Performance
Standards (attached). The Standards of Performance for New
Sources (1974 SPNS) as promulgated on October 8, 1974 (40 CFR
423, 39 FR 36186, particularly § 423.15) remain the applicable
standards for the Mayo plant and not the requirements of the 1982
promulgation (except for more stringent 1982 BAT requirements as
noted below).
The following must be corrected prior to reissuance:
1. Mass limitations are required in the permit by the 1974
SPNS. We recommend that flow -weighted concentration
limitations consistent with the "Guidance for NPDES
Permits Issued to Steam Electric Power Plants" signed
Recycled/Recyclable • Pnnied with Vegetable Oil Based Inks on 100% Recycled Paper (40% Postconsumer)

2
by Ms. Rebecca Hanmer on August 22, 1985 (attached), be
included in the permit also.
2. Reduction in limitations to include bottom ash recycle
under 1974 SPNS (if applicable). The limitations
developed for the bottom ash component of the discharge
(OSN 002) should be divided by a factor of 20.
3. Discharge of pollutants in cooling tower blowdown is
limited by both the 1974 SPNS and 1982 BAT standards.
Accordingly, the discharge of corrosion inhibitors and
the 126 priority pollutants (including chromium, zinc,
and phosphorus) in detectable amounts are prohibited.
4. Mass (and concentration) limitations attributable to
coal pile runoff and cooling tower blowdown, and other
sources of dilution flow must be incorporated into the
ash pond limitations. (See Aug 22, 1985 Hanmer
Guidance).
5. "Boiler Blowdown" is a separate category from low
volume wastes under 1974 SPNS.
6. Both chemical and non -chemical metal cleaning wastes
are subject to performance standards for metal cleaning
wastes. Although these wastes are not indicated in the
application, they are generally present at steam
electric power plants, unless disposed of in an off-
site.
If you have any comments or questions, please contact Darryl
Williams of my staff at [phone].
Enclosures
Sincerely,
Dougl F. Mundrick, P.E., Chief
Surface Water Permits and
Facilities Branch
Water Management Division

` • �� � sr��s 0.�� t
A UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
' WASHINGTON. D.C. 20460
c
OFFICE OF
WATER
AUG 22 'QA5
MEMORANDUM
SUBJECT: Guidance for NPDES Permits Issued to Steam Electric
ry wer Plants
FROM: Rebecca W. Hanmer, Director
Office of Water Enforcement and Permits (EN-335)
TO: Regional Water Management Division Directors
State NPDES Directors
The Office of Water Enforcement and Permits (OWEP) has
received several inquiries about the proper implementation of the
effluent limitations guideline for the steam electric power gene-
rating industrial category that was promulgated on November 19,
1982 (47 FR 52290). Specifically, we have been asked for guidance
regarding the establishment of limitations when regulated process
wastewater is commingled in a treatment facility such as an ash
pond with uncontaminated dry weather flows or rainfall runoff.
The attached guidance addresses the establishment of concentration
or mass -based limits for such discharges.
We have also been asked to prepare guidance regarding the
establishment of limitations for once -through cooling water when
sequential chlorination is practiced. We are now preparing
guidance on this subject. Until guidance is transmitted, please
direct your specific questions to Charles Kaplan, National Expert
for Thermal Pollution and Steam Electric, Water Management Division,
Region IV, at FTS 257-3012. If you have'any questions about the
attached guidance please call Charles Kaplan or Gail Goldberg
of the Permits Division at FTS 426-7010.
Attachment
cc: Ed Johnson (OWRS)
Jeff Denit (ITD/OWRS)
Coke Cherney (OGC)

i
GUIDANCE FOR CO -TREATMENT FACILITIES '!
AT STEAM ELECTRIC POWER PLANTS
I. Ouestion
What limitations for total suspended solids (TSS) and oil
and grease (O&G) are appropriate in NPDES permits which regulate
discharges from co -treatment facilities at steam electric power
plants? Co -treatment facilities in this context are treatment
facilities such as ash ponds where process wastewater is commingled
with uncontaminated dry weather flows or rainfall runoff. An
uncontaminated flow is one with little or no TSS or 0&G.
II. Answer
The specific answer depends on whether or not rainfall run-
off is commingled with the regulated waste stream in the treatment
facility. In general, whenever different types of waste streams
are subjected to co -treatment, mass limitations or flow -weighted r
concentration limitations should be applied to the combined v
discharge.
When rainfall runoff is not involved, concentration limits
should be flow -weighted to account for dilution from combination
with wastes not regulAted for TSS and O&G. Some credit for
Pollutants present in the unregulated flows based on best
professional judgment may be appropriate, if adequate data are
available to characterize these flows. See the discussion in
section IV below for more detail.
When one or more cf the waste streams results from a rainfall
event, as in the case cf coal pile runoff (guidelines limited) or
other site runoff (not regulated by guidelines), more stringent
limitations or other permit conditions may be needed to assure

-2 -
compliance with the regulations. In such cases, the capacity of
f the co -treatment facility is essential in determining whether BPT
and BAT requirements are likely to be met. Sufficient capacity
is needed to assure that previously settled pollutants are not
washed out under high flow conditions.
Under rainfall runoff conditions we suggest two alternative
approaches to permitting which are presented in Section V below.
The first alternativ- discusses limitations for a co -treatment
facility with sufficient capacity to meet BPT, BAT, and HSPS
during periods of heavy flow. A second approach describes the
limitations when the co -treatment facility does not have sufficient
capacity necessary to assure compliance with BPT, BAT, and NSPS.
Where rainfall runoff is involved, we suggest additional
monitoring requirements in permits as descrihed in Section VI below.
III. Background
The effluent limitation guidelines for the steam electric
power generating industrial category, under 40 CFR Part 423,
(November 19, 1982, 47 FR 52290) establish limitations for total
suspended solids (TSS) (30*/100**mg/1) and oil and grease (O&G)
(15*/20**mg/1) for certain waste streams including low volume
wastes and ash transport water. However, these limitations are
not appropriate for TSS and 0&G if dilution occurs in a co -treatment
facility. For example, dilution occurs where guidelines -limited
flows are mixed with uncontaminated dry weather waste flows,
coal pile runoff or other wet weather runoff flows.
Daily Average Daily Maximum

-3 -
It is the intent of EPA that mass or flow -weighted concen-
tration limitations be included in NPDES permits. 40 CFR 423.12(b),
states (the same requirements are in 423.13 and 423.15):
"(11) At the permittinq authority's discretion, the quantity
of pollutant allowed to be discharged may be expressed as
concentration limitations instead of the mass based limitations
specified in paragraphs (b)(3) through (7) of this section.
Concentration limitations shall be those concentrations
specified in this section."
"(12) In the event that waste streams from various sources
are combined for treatment or discharge, the quantity of each
pollutant or pollutant propertv controlled in paragraphs (b)(1)
through (11) of this section attributable to each controlled
waste source shall not exceed the specified limitations for
that waste source."
IV. Co -Treatment Facilities Without Rainfall Runoff
To be consistent with the guidelines limitations, concen-
tration based permit limitations should account for dilution
where unregulated dry weather flows are combined in a co -treatment
facility with regulated waste sources. Examples of unregulated
dry weather flows are cooling tower blowdown (with little or no
0&G), once -through auxiliary equipment cooling water (little or
no added TSS or 0&G) and air conditioning wastes (no added TSS
or 0&G). Some best professional judgment (BPJ) credit for
pollutants present in such low contamination flows may be granted
by the permitting authority, if adequate supporting data are
presented by the permittee. However, any calculations to provide

-4-
credit
4-credit should also consider the removal provided by the co -
treatment facility.
V. Co -treatment Facilities With Rainfall Runoff
In evaluating situations in which coal pile runoff, unregu-
lated wet weather flows and dry weather flows are combined in
the co -treatment facility, it is necessary to determine whether
the limitations developed for dry weather conditions will assure
compliance with BPT and BAT. Under circumstances in which the co -
treatment facility has sufficient capacity to provide a specified
minimum level of treatment, the dry weather limitations generally
will be sufficient to provide that assurance. However, if the
co -treatment facility does not have sufficient capacity to provide
the minimum level of treatment, alternate limitations should be
developed.
To determine if the dry weather limitations will assure
compliance with BPT, BAT, and NSPS, it is necessary to determine
if the limitation for coal pile runoff can be met. The guidelin-s
limitations for coal pile runoff is 50 mg/l as an instantaneous
maximum for TSS. There is no allowance for OCG. This guidelines
limitation is significantly more stringent than those discussed
above for other wasto streams (30/100 for TSS and 15/20 for O&G).
In the 1974 -Development Document (EPA -440/1-74/029(a),
October 1974, page 312), EPA defined treatment technology for
coal pile runoff as follows:

Q.i
"Storage ponds for retention and treatment for coal pile
runoff should be designed for local weather conditions.
The design basis of the pond should be complete retention
of runoff resulting from a storm which occurs once in
ten years."
In promulgating these regulations (39 FR 36186, October 8,
1974), EPA relied on this technology not only for coal pile
runoff, but also for all runoff sources included in the "area
runoff subcategory" (Subpart D, 40 CFR 423.40-.46). Additionally,
in the 1982 Development Document (EPA -440/1-82/029, November 1982,
page 274) EPA determined that limitations for seven toxic pollutants
which were found to be present in coal pile runoff (beryllium,
cadmium, chromium, copper, lead, nickel, and zinc) could be excly
from further national regulation since the BPT and NSPS limitations
for TSS would effectively control the discharge of those pollutants.
A. The Co -Treatment Facility Has Sufficient Capacity
To assure compliance with BPT, BAT and NSPS, the co -treatment
facility should have sufficient capacity. The capacity of the co -
treatment facility is sufficient if the minimum free water volume
(between the top of the sediment level and the minimum discharge
elevation) is greater than or equal to the sum of the following
volumes:
(1) rainfall directly on the entire pond area (total area
inside dike) resulting from a 10 -year, 24-hour rainfall
event (10y24h rainfall) for the locality in question,

-6-
(2) all rainfall related flows (e.g., coal pile runoff,
roof and yard drains, etc.,) to the facility resulting
from the 10y24h rainfall,
(3) maximum dry weather waste stream flows to the facility
over a 24-hour period, and
(4). Solids added to the sediment level of the co -treatment
facility during the term of the permit.
This minimum level of treatment is considered necessary to
assure that the high flows and velocities through the co -treatment
facility associated with the 10y24h rainfall (1) do not wash out
previously settled pollutants, and (2) do not preclude proper
sedimentation and removal of pollutants during and subsequent to
the 10y24h rainfall event. Availability of this free water volume
will generally assure compliance with BPT, BAT, and NSPS requirements'
of 40 CFR 423 for both plant wastes and runoff flows. Then the
flow -weighted dry weather limitations are appropriate during wet
weather conditions (at a maximum of 30/100 mg/l TSS and 15/20
mg/l oil and grease).
B. The Co -Treatment Facility Does Not Have -Sufficient Capacity
Where the co -treatment facility does not have sufficient
capacity, more stringent requirements are necessary to assure
that BPT, B4T, and NSPS requirements are met. In this case, the
permittee may need to increase the capacity of the co -treatment
facility by adding additional pond(s), dredging, increasing dike
or weir height, adding stop logs, etc. An expansion of the
co -treatment facility should be completed under the terms of an

SM
administrative order which includes a compliance schedule for
the modifications.
If the permittee is unable to increase system volume, the
following items should be considered:
1. Mass or flow -weighted dry weather limitations;
2. Mass or flow -weighted wet weather limitations to assure
that coal pile guideline requirements are met;
3. Toxic pollutant limitations and/or monitoring;
4. Frequency and timing of sampling;
5. Internal monitoring on tributary waste streams;
6. Reopener clause keyed to internal monitoring data; and
7. Other site-specific factors.
The permit writer should contact Charles Kaplan (Region IV, r
404/881-3012, FTS 257-312) for assistance in developing permit
limitations or other conditions to assure compliance with quidelines
requirements under wet weather conditions.
VI. Additional Monitoring
When significant quantities of wet weather flow are co -treated
in the treatment facility, additional monitoring requirements for
TSS, OCG, and flow are appropriate for all significant rainfall events
(e.q, 258°of the 10y24h rainfall). This monitoring requirement should
specify samplinq at the time of maximum expected flow (6 to 24 ho,-rs
or more after the event depending on co -treatment facility character-
istics).

-8-
Such
8-Such monitoring conditions could be modified or terminated at
o
a later date when enough data have been collected to demonstrate
continuing compliance during wet weather conditions.

PLANT EXAMPLE
Available information
Low, volume wastes 10.0 MGD
Ash transport water 20.0
Cooling tower blowdown 5.0
Auxiliary coolinq water 5.0
Metal cleaning waste 0.2 MG/cleaning(1)
Total plant dry weather flow 40.0 MGD
Coal pile area 30.0 acres
Parkinq lot area 16.0
Roof and yard drain, etc. area 35.0
Ash pond area(2) 100.0
Total runoff area 181.0 acres
10 -year, 24-hour storm (10Y24H)
Annual rainfall
Calculations
5.5 inches/day
60.0 inches (0.164 inch/day)
5/23/85 �r
Cwt '
Runoff frac 10Y24H storm at a runoff coefficient of 1.0(3) - 27.0 MG
Total ash pond volume necessary for use of alternate approach - 67.0 MG
= 206 A -f t
Notes:
1. Not used in calculations since metal cleaning wastes and ash
transport water do not normally occur simultaneously.
2. Including ash delta and interior dike slopes.
3. A runoff coefficient of 1.0 is recammended since (1) the 10Y24H
storm is'generally part of a larger storm system and the ground is
likely to be nearly saturated and (2) storms of larger magnitude
than the 10Y24H will occur but are not being considered in the
calculations.

CASE I
5/23/85
Ash pond water surface area (acres) 80.0
Average water depth (feet) 3.25
Available volume (A -ft) 260.0
Since the pond volume exceeds the necessary storage volume of 206 A -ft required to use
the alternate approach, only dry weather flows need be used in calculating effluent
limitations.
"43te :
1. Based on BPJ and/or available data
Daily Average
Daily Maximum
Flow
Limitations (mg/1)
Limitations
(mg/1)
Sources
( MGD)
TSS 06G
TSS
O&G
Low volume wastes
10.0
30 15
—IW—'
20
Ash transport water
20.0
30 15
100
20
Auxiliary cooling water
5.0
5(1) 0(1)
10(1)
1(1)
Cooling tower blowdown
5.0
30(1) 0
60(1)
3(1)
Flow weighted concentrations
(40.0)
26.9 11.3
83.8
15.5
Effluent limitations
27 11
84
16
"43te :
1. Based on BPJ and/or available data

6/26/85
CHK
CASE II
Ash pond water surface area (acres) 50.0
Average water depth (feet) 3.00
Available volume (A -ft) 150.0
Since the pond volume is less than the necessary storage volume of 206 A -ft required to use the
alternative approach, wet weather flaws must be used in calculating effluent limitations unless the
permittee is willing to increase the available volume.
NOTES •
1. Runoff flows based on annual average rainfall of 0.164 inch per day with a runoff coefficient of
1.0. Another rainfall rate based on BR7 might be used such as the average rainfall rate for the
maximum month, etc.
2. Based on BPJ and/or available data.
3. BPJ that 30 mg/1 as both daily average and daily maximum is equivalent to the guideline
limitation of 50 mg/l as an instantaneous maximum.
4. BPJ that partial credit for TSS is applicable for runoff on the pond surface which provides
dilution, but also tends to "push" water already in the pond out. (Note that the pond surface is
only 50% of the pond acreage.) No credit is given for 06G from direct rainfall.
5. Guideline provides no O&G contribution from this source.
6. Runoff flows based on 10Y24H rainfall of 5.5 inches per day with a runoff coefficient of 1.0.
7. Limitation must be less than or equal to the limitation derived for Case I.
8. Since the calculated daily maximum value (9 mg/1) is less than the daily average value (11 mg/1)
for O&G and the lower value would have to be used for both CM and DA, a possible alternate could
include limitations of: 11 mg/1 as a OA, 94 as a CM when rainfall exceeds 1.0 inch/day (or
other BPJ value) and 16 mg/l (from Case I) CM at any lower rainfall rate.
DA
Daily Average
DM
Daily Maximum
Flow
Limitations
(mg/1)
Flow
Limitations
(mg/1)
Sources
(MGD)
TSS
O&G
(MGD)
- TSS
O&G
Low volume wastes
10.0
30
15
10.0
100
20
Ash transport water
20.0
30
15
20.0
100
20
Auxiliary cooling water
5.0
5(2)
0(2)
5.0
10(2)
1(2)
Cooling tower blowdown
5.0
30(2)
0(2)
5.0
60(2)
3(2)
Coal pile runoff
0.13(1)
30(3)
0(5)
4.48(6)
30(3)
0(5)
Parking lot runoff
0.07(1)
20(2)
5(2)
2.39(6)
30(2)
3(2)
Roof and yard drains, etc.
0.16(1)
20(2)
0(2)
5.23(6)
30(2)
0(2)
Ash pond surface rainfall
0.45(1)
20(4)
0(4)
14.93(6)
50(4)
0(4)
Flow weighted concentrations
Effluent limitations(7)
(40.81)
26.8
27(7)
11.03
9(7,8)
(67.03)
66.53
67(7)
9.4
9(7,8)
NOTES •
1. Runoff flows based on annual average rainfall of 0.164 inch per day with a runoff coefficient of
1.0. Another rainfall rate based on BR7 might be used such as the average rainfall rate for the
maximum month, etc.
2. Based on BPJ and/or available data.
3. BPJ that 30 mg/1 as both daily average and daily maximum is equivalent to the guideline
limitation of 50 mg/l as an instantaneous maximum.
4. BPJ that partial credit for TSS is applicable for runoff on the pond surface which provides
dilution, but also tends to "push" water already in the pond out. (Note that the pond surface is
only 50% of the pond acreage.) No credit is given for 06G from direct rainfall.
5. Guideline provides no O&G contribution from this source.
6. Runoff flows based on 10Y24H rainfall of 5.5 inches per day with a runoff coefficient of 1.0.
7. Limitation must be less than or equal to the limitation derived for Case I.
8. Since the calculated daily maximum value (9 mg/1) is less than the daily average value (11 mg/1)
for O&G and the lower value would have to be used for both CM and DA, a possible alternate could
include limitations of: 11 mg/1 as a OA, 94 as a CM when rainfall exceeds 1.0 inch/day (or
other BPJ value) and 16 mg/l (from Case I) CM at any lower rainfall rate.

4 . �
1/27/88
SAMPLE ASH POND PAGE USING "GUIDANCE FOR CO -TREATMENT FACILITIES CHK
AT S:! -AM ELECTRIC POWER PLANTS, August 22, 1985"
PART I
Page I-1
Permit No. XXXXXXXXX
A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
1. During the period beginning on the effective date of this permit, and lasting through the expiration date,
permittee is authorized to discharge from outfall serial number 001 - ash pond discharge to the River.
Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characteristic
Discharge Limitations
Daily Avg Daily Max
Monitoring Requirements
Measurement Sample
Frequency. Tme
Flow - m3/day (MGD) - - 1/week Y Weir
Oil and Grease 12 mg/1 17 mg/1 1/week jj Grab
Total Suspended Solids 26 mg/l 80 mg/l 1/week Y Grab
Heavy Metals (mg/1) 2/ - - 1/month 1 Grab
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored
1/week by grab sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
Samples taken in ccmpliance with the monitoring requirements specified above shall be taken at the following
location(s): discharge from ash pond prior to mixing with any other stream, except that heavy metals shall
also be monitored at the plant intake.
1/ One additional grab sample shall be collected and analyzed for oil and grease, and total suspended solids
during the period of maximum expected flow for each rainfall event exceeding one inch per day. The
corresponding flow shall be reported. The permittee shall report the presence of cenospheres observed in
the samples. After monitoring for a period of one year, the permittee may request reduction or elimination
of this monitoring.
2/ Monitoring for heavy metals shall include total arsenic, copper, selenium, and zinc. After monitoring for
a period of one year, permittee may request reduction or elimination of this monitoring.
NOTE t_ permit writer: The metals noted in footnote 2/ are those parameters previously found to be present in
f ho aah nnnH Pf f l i itanf that uanrc- nF rrnnrs-rn real at i i n + ...n1 —1 4 E., -i- . A-A_ __; &-_4 - —1- -

SAMPLE PERMIT SPECIAL CONDITION (PART III)
USING "GUIDANCE FOR CO -TREATMENT FACILITIES AT
STEAM ELECTRIC POWER PLANTS, August 22, 1985"
1/27/88
CHK
Beginning on the effective date of this permit and lasting until expiration,
there shall be no discharge of plant wastes to the (system name) unless the
permittee provides and maintains at all times a minimum free water volume (between
the top of the sediment level and the minimum discharge elevation) equivalent to
the sum of the maximum 24-hour plant discharges plus all direct rainfall and all
runoff flows to the pond resulting from a 10 -year, 24-hour rainfall event, when
using a runoff coefficient of 1.0. During the term of the permit, the permittee
shall remove settled material from the ponds or otherwise enlarge the available
storage capacities in order to maintain the required minimum volumes at all
times. Not later than December 31, , and annually thereafter, the permittee
shall determine and report to the permit issuing authority: (1) the actual free
water volume of the (name of co -treatment system), (2) physical measurements of
the dimensions of the free water volume in sufficient detail to allow validation
of the calculated volume, and (3) a certification that the required volume is
available with adequate safety factor to include all solids expected to be depo-
sited in the ponds for the following year. Present information indicates a needed
volume of . MG ( . A -ft) in addition to solids which will be deposited in the
(system name). Any changes to plant operations affecting such certification
shall be reported to the Director within five days.
Note to permit writer: In the event that adequate volume has been certified to
exist for the term of the permlit, periodic certification is not needed.

PLANT WASTES RAINFALL RUNOF:
I- LIMITED MG/L orMC
L X Fr-�r•ti.
• / i j COAL PILE RUNOFF
LIMITED MG/L X FLOW ! I INSTANTANEOUS MAX
ASH TRANSPORT T55 50
LOW VOLUME I O&C Not expected
1 -day 30 -day
I
TSS 100 30
06G 20 15
NOT LIMITED
COOLING TOWER
AUXILIARY COOLING
t
ASH POND
i
i
1
EFFLUENT
1 NOT LIMITED
ROOF DRAINS .
MATERIAL STORAGE
-• YARD DRAINS
PARKING LOTS
DIRECT RAINFALL
TRIBU-, ARY AREA
STREAM

� Z � '�

r
1/27/88
CHR
SAMPLE FACT SHEET PAGES FOR ASH POND Page 1 of 2
��
USING GUIEANCE FOR CO -TREATMENT FACILITIES
AT STEAM ELECTRIC POWER PLANTS, August 22, 1985"
II. Effluent Limitations
A. Outfall Serial Number 001 - Ash Pond Discharge. Limitations are required by
promulgated 40 CFR 423 for low volume wastes, fly ash and bottom ash transport
water, metal cleaning wastes, and coal pile runoff.
1. BPT and BCT: Based on 40 CFR 423.12 the allowable discharge pH for direct
discharge is 6.0 standard units minimum and 9.0 maximum. Except where
otherwise noted, the BPT limitations given by 40CFR423.12 for Total Suspended
Solids (TSS) and for Oil and Grease (O&G) are:
*Best Professional Judgement
**mg/l as an instantaneous maximum (40CFR423.12)
It is the EPA, Region IV Best Professional Judgment (BPJ) that BCT is equiva-
lent to BPT for O&G and TSS. A BPJ has also been made in accordance with
40 CFR 423.12(b)(11), that permit effluent limitations for this outfall are
to be expressed in concentration rather than mass.
For purposes of determining dry -weather effluent limitations it is assumed
that ash sluicing and metal cleaning do not occur simultaneously for any
single unit, and that dry -weather flow due to coal pile runoff is negligable.
Dry -weather and
to this discharge may then be grouped as follows:
S
Category Qi (MGD) C;(mg/1)
O&G TSS
Process wastewaters 54 15/20 30/100
Uncontaminated flows 15 0.1 10
The flow -weighted concentration is then calculated using the equatio-:
Cd = Sum Q;Ci
Sum Qi
which yields (when rounded to the nearest integer):
parameter
Oil and Grease
Total Suspended Solids
daily average
12 mg/l
26 mg/l
daily max imur,
17 mg/l
80 mg/l
_ Concentration in mg/1
Contaminated Flow
MGD (avg)
O&G
TSS
avg max
avg max
Ash transport water
53.856
15 20
30
100
Chemical metal cleaning
-
15 20
30
100
Low volume
0.399
15 20
30
100
Coal pile runoff
-
0.0* 0.0*
-
50**
Noncontaminated flow
14.990
0.1* -
10*
-
*Best Professional Judgement
**mg/l as an instantaneous maximum (40CFR423.12)
It is the EPA, Region IV Best Professional Judgment (BPJ) that BCT is equiva-
lent to BPT for O&G and TSS. A BPJ has also been made in accordance with
40 CFR 423.12(b)(11), that permit effluent limitations for this outfall are
to be expressed in concentration rather than mass.
For purposes of determining dry -weather effluent limitations it is assumed
that ash sluicing and metal cleaning do not occur simultaneously for any
single unit, and that dry -weather flow due to coal pile runoff is negligable.
Dry -weather and
to this discharge may then be grouped as follows:
S
Category Qi (MGD) C;(mg/1)
O&G TSS
Process wastewaters 54 15/20 30/100
Uncontaminated flows 15 0.1 10
The flow -weighted concentration is then calculated using the equatio-:
Cd = Sum Q;Ci
Sum Qi
which yields (when rounded to the nearest integer):
parameter
Oil and Grease
Total Suspended Solids
daily average
12 mg/l
26 mg/l
daily max imur,
17 mg/l
80 mg/l

SAMPLE FACT SHEET PAGES FOR ASH POND
USING "GUIDANCE FOR CO -TREATMENT FACILITIES
AT STEAM ELECTRIC POWER PLANTS, August 22, 1985"
1/27/88
CHK -
Page 2 of 2
Under wet weather' conditions, coal pile runoff becomes significant, as does
uncontaminated surface r..moff. The EPA, "Guidance for Co -Treatment Facili-
ties at Steam Electric Power Plants, August 22, 198511, however, allows use of
a single set of flow -weighted concentration limits derived for dry weather
conditions (not to exceed 30/100 mg/1 for TSS and 15/20 for O&G), to be used
for all -weather conditions provided that, for the life of the permit, the
treatment faaality shall have available a minimum free water volume of at
least the sum of:
(1) maximum dry weather plant waste flows to the ash pond over a
24-hour period,
(2) rainfall directly on the entire pond area (total area inside dike)
resulting from a 10 -year, 24-hour rainfall event (10y24h rainfall)
for the plant site,
(3) all rainfall related flows (e.g. coal pile runoff, roof and yard
drains, etc.) to the ash pond from the 10y24h rainfall, using a
runoff coefficient of 1.0, and
(4) solids to be added to the sediment level of the ash pond during
the tern of the permit.
The applicant has provided the following information:
Dry weather maximum plant flow = 69.7 million gallons/day (MGD)
Runoff area = 418 4 acr ( h
10y -24h rainfall intensity
Runoff to ash pond
Total ash pond influent
Solids to be added
Ash pond capacity
es as pond, coal pile,
roof .drains, and south plant area)
= 0.21 inches/hour
= 57„3 MGD
= 127 MGD
= 200 MG (equivalent dry volume)
= 377 MG
The August 22 1985, Guidance is therefore applicable to this facility.
In addition to maintaining the required volume in the ash pond, the guidance
provides that additional monitoring of the ash pond effluent shall be per-
formed whenever a rainfall event occurs which exceeds 25% of the 10y24h
rainfall. For implementation of these conditions, see Part I, page I-1, and
Part III.A. of the attached draft permit.

A.AJU.L LS
(both October 1 �Nave_r�ixr 19, 1982 Ae9ulatirns)
• 1. Effli nt C cif lines - Pbm t is i r rally of tt fo®, 'Z1 quantity of
pollutants discharges from (name of waste source) shall not exceed the
O
quantity determined by multiplying the flow of (naTM of waste source)
time the concentration listed in the following tables (emphasis added),
and
2. 'In the event that waste streams from various souoes are combined for treat-
ment or discharge. the = of each pollutant or pollutant property
controlled in paragraphs ... of this section attributable to each controlled
waste source shall not exceed the specified limitation for that waste souroe"
(emphasis added).
B. Permit Writer's option to Use Concentration Limits
(November 19, 1982)
"At the permitting authority's
discretion, the qURnt� of
pollutant
allowed to be
discharged may be e- as
a concentration limitation
i_ of
the mass based
limitations specified in paragraphs ... of this section.
shall be those concentrations specified in this section.•
Concentration limitations
( emphasis added)
C. Guidelines Conbination of Waste Streams (No Dilution) Acquirement
See Item A.2. above
D. Limitations for Coal Pile Runoff
1. Effluent Guidelines (Nmmmber 19, 1982) - '(9) Subject to the provisions of
Paragraph b(10) of this section, the following effluent limitations shall
apply tD the point source discharges of coal pile ru oft:
' BPr effluent limitations
Pollutant or pollutant property ' Maximum concentration for
' any time (m9/1)
T S0
(10) Any untreated overflow from facilities designed, constructed, and
operated to treat the vol une of coal pile runotf which is associates with
a 10 year, 24 hour rainfall event shall not be subject to the limitations
in paragraph (b)(9) of this section."

2. 1974 Dewlopomt Document Asquirasnts - 'storage pondsfor retention
and
treatmnt of coal pile runoff should be designed for local tether conditions:
Me desicn basis of the pond should be oanplets retention of runoff resultl_ `
fran a shots which occurs ones in ten Years. piping and/or open channels w.,,
for collection of runoff frau the coal pile should be designed to bypass all
Clow which exceeds the design basis of the storage pond. weirs, baffles and
regulators such as utilised in combined municipal sewer systems may be WVloyed
to bypass excess flow and avoid overloading of the storage pond. ...
Coal pile drainage with jAi trap 6 to 9 ane low dissolved solids can be punped
to an ash pond along with other waste streams, depending upon available area
of the pond.•

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CP&L- Maio NCO038377 Al
Subject: CP&L- Mayo NCO038377
• Date: Wed, 29 Nov 2000 09 56 04 -0500
From: Tom Belnick <tom belnlck@ncmail net>
To: Kevin Bowden <Kevm Bowden@ncmall net>
Kevin- This CP&L draft permit is finally going to be finalized. They
currently have an Acute Tox P/F Limit (QRTRLY) at 90% for Outfall 002
(discharge from ash basin), which they have passed since 1996 There is
no IWC calculated for Outfall 002, since the discharge is to a lake
(Mayo Reservoir). Outfall 002 is a continuous discharge, receiving
waste streams from a variety of sources (ash transport water, treated
domestic wastewater, boiler blowdown, etc) My question- is the old tox
language (attached, see Special Condition A (5)) still applicable, or
has it been updated? Thanks
Mailto [e-mail]
N.0 DENR-DWQ/NPDES Unit
1617 Mail Service Center, Raleigh NC 27699-1617
Work: [phone] ext 543
Fax: [phone]
Name: 38377-A4 special cond doc
38377-A4 special cond.doc Type: Microsoft Word Document (application/msword)
Encoding: base64
1 of 1 11/29/00 9 56 AM

cpanGI-mala
Subject: cpandl-mayo
Date: Wed, 29 Nov 2000 10 46 05 -0500
From: Kevin Bowden <kevin Bowden@ncmall net>
To: Tom Belmck <Tom Belnick@ncmall net>
Tom, I received your e-mail Attached, please find updated language
to be included in the permit Call if you have any questions
kevin
LJ QAL PF Fathead new cpand124 doc
Name: QAL PF Fathead new cpand124 doc
Type: Microsoft Word Document
(ap p l l c ati on/m s w ord)
Encoding: base64
Download Status: Not downloaded with message
1 of 1 11/29/00 11 49 AM

SPECIAL CONDITIONS
A(5). ACUTE TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The permittee shall conduct acute toxicity tests on a quarterly basis using protocols defined in the North Carolina
Procedure Document entitled "Pass/Fall Methodology For Deternuning Acute Toxicity In A Single Effluent
Concentration" (Revised -July, 1992 or subsequent versions). The monitoring shall be performed as a Fathead
Minnow (Pimephales promelas) 24 hour static test The effluent concentration at which there may be at no time
significant acute mortality is 90% (defined as treatment two in the procedure document) Effluent samples for self-
monitoring purposes must be obtained during representative effluent discharge below all waste treatment The tests
will be performed during the months of February, May, August and November
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR -1) for the month in which it was performed, using the parameter code TGE6C Additionally,
DWQ Form AT -2 (original) is to be sent to the following address -
Attention North Carolina Division of Water Quality
Environmental Sciences Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch no later than 30 days
after the end of the reporting period for which the report is made
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed in
association with the toxicity tests, as well as all dose/response data Total residual chlorine of the effluent toxicity
sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the
permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility
name, permit number, pipe number, county, and the montb/year of the report with the notation of "No Flow" in the
comment area of the form. The report shall be submitted to the Environmental Sciences Branch at the address cited
above
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will
begin immediately until such time that a single test is passed Upon passing, this monthly test requirement will revert
to quarterly in the months specified above
Should the permittee fail to monitor during a month in which toxicity monitoring is required, then monthly
monitoring will begin immediately until such time that a single test is passed Upon passing, this monthly test
requirement will revert to quarterly in the months specified above
Should any test data from either these monitoring requirements or tests performed by the North Carolina Division of
Water Quality indicate potential impacts to the receiving stream, this permit may be re -opened and modified to
include alternate monitoring requirements or limits
NOTE- Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival and appropriate environmental controls, shall constitute an invalid test and will require immediate follow-up
testing to be completed no later than the last day of the month following the month of the initial monitoring.
QAL PIF Fathead 24 Version 9196

->" r,94Vk
1 1 a"X Permit No. NCO038377
Row, -0 swoe" W7
SUPPLEMENT TO PERMIT COVER SHEEXelv a elle alllvolT
Carolina Power & Light Company
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 (See Part III of this permit):
Cooling Tower Blowdown System (outfall 001) This water is usually mixed directly with
the ash sluice water Occasionally (once per year maximum) it is not mixed with bottom
and fly ash and is discharged directly into the ash pond Heat exchanger water (low
volume waste) is almost continuously discharged through outfall 001 Approximately once
every two years the cooling towers are drained completely for maintenance. This
discharge goes directly into Mayo Reservoir. Outfall 001 discharges into the ash pond and
is ultimately released into the Mayo Reservoir through outfall 002,
• Ash Pond Treatment System (Outfall 002) 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, and equipment heat exchanger water. The
domestic waste from the sewage treatment plant also discharges through outfall 002.
• Stormwater Discharge System The facility is permitted to discharge stormwater through
the following outfalls
Outfall 004 - Drainage from the outside storage area.
Outfall 005 - Drainage from the industrial area and the oil/gas storage
area
Outfalls 006, 006a, 006b, 006c, 006d, 006e - Drainage from the chemical feed
building and the cooling tower area
2 Discharge from said treatment works at the location specified on the attached map into the
Mayo Reservoir which is classified as Class C waters in the Roanoke River Basin
All discharges shall be EerMonitoring,
nce with the attached schedules
Part I: Waste Controls�Liis for Permitted Discharges
Part II: ormworing, Controlons for Permitted gjs�arges
Part I Standard ConditiZforISDES Permits
art IV: Annual AdministCompliance Monittor�t Fee Requirements
Part V: Limitatio eopener
This permit does relieve the permittee fro esponsibility for compliance with a
applicable fid , state or local law, rule, standard, ordinances, order, judgmenIX d

PART I WASTEWATER MONITORING, CONTROLS AND LIMITATIONS FOR PERMITTED DISCHARGERS Page 3 of 6
A (3) STORMWATER MONITORING REQUIREMENTS FINAL
Permit No NCO038377
(a) Analytical Monitoring
During the period beginning on the effective date of the permit and lasting until expiration or'expansion, the Permittee is authorized to discharge from outfalls
serial number 004, 005, and 006a, b, c, d, e (Stormwater) Such discharges shall be limited and -monitored by the Permittee as specified below
STORMWATER DISCHARGE
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Units Cut-off Measurement Sample Sample
Concentration' Erequencyz Type Location3
Total Flow4
MG
Annual
SDO
Total Rainfall4
Inches
Annual
Event Duration
Minutes
Annual
Oil and Grease
m /I
30 0 -,
Annual
Grab
SDO
COD
m I
120 0 w
Annual
Grab
SDO
Total Suspended Solids
m /I
100 0
Annual
Grab
SDO
Where: 004 - Drainage from the outside storage area
005 - Drainage from the industrial area and the oil/gas storage area
006a, b, c, d, e -Drainage from the chemical feed building and the cooling tower area One representative outfall maybe monitored
—047aamb—Oxainage from the railroad area (excluding that area -draining -directly to the ash pond) One -representative outfall maybe monitored
Notes:
For each parameter, the arithmetic mean of all analytical sampling results collected during the first year of the permit shall be calculated for each individual
outfall and compared to the cut-off concentrations listed If the arithmetic mean meets the specified cut-off concentration condition for a given parameter,
then the facility is not required to continue annual analytical monitoring for that parameter at the outfall during the term of the permit unless a significant
change in facility operations or configuration occurs If a cut-off concentration results in discontinued analytical monitoring at an individual discharge outfall,
the permittee is required to maintain facility operations that ensure the continuation of stormwater runoff quality
The Permittee must perform analytical sampling during the first and last year of the permit term regardless of cut-off concentration conditions Analytical results
from sampling during the final year of the permit term must be submitted with the permit renewal application
)The parameter pH cannot be averaged -due -to the nature of the logarithmic pH scale The most recent pH -sample result shall,be used forcut off concentration
purposes,,_/ —�
2 Measurement frequency- Once per year The facility must perform analytical sampling during the first and last year of the permit term regardless of cut-off
concentration conditions

PART I WASTEWATER MONITORING, CONTROLS AND LIMITATIONS FOR PERMITTED DISCHARGERS (Continued)
A(3) STORMWATER MONITORING REQUIREMENTS FINAL, (Continued)
Page 4 of 6
Permit No NCO038377
s SampIQ Location Samples to be taken at each stormwater discharge outfall (SDO) unless representative outfall status has been granted If a facility has
multiple discharge locations with substantially identical stormwater discharges that are required to be sampled, the Permittee may petition the Director for
representative outfall status If it is established that the stormwater discharges are substantially identical and the permittee is granted representative outfall
status, then sampling requirements may be performed at a reduced number of outfalls
4 For, each sampled representative storm event the total precipitation, storm duration, and total flow must be monitored Total flow shall be either, (a)
measured continuously, (b) calculated based on the amount of area draining to the outfall, the amount of build -upon (impervious) area, and the total amount
of rainfall, or (c) estimated by the measurement of flow at 20 minute intervals during the rainfall event (not to exceed three hours)
For purposes of the stormwater sampling required in this permit, all samples shall be collected from a discharge resulting from a representative storm event (See
Part III, Other Requirements, Section F) Failure to monitor storm events in accordance with the specified frequency shall constitute a violation of this permit
(b) liisuat Monitoring
_41sual monitoring requires a qualit ative-visual inspection of each stormwater outfall, regardless of representative outfall status, for the purpose of evaluating the
effectiveness of the Stormwater Pollution Prevention Plan (SPPP) and assessing new sources of stormwater pollution No analytical tests are required Visual. -
monitoring of stormwater outfalls does not need to be performed during a representative storm event,
Y
Stormwater Discharge
Characteristics
Monif<ot
T ez
Monitoring
Locations
Color
Semi -Annual
Visual
SDO
Odor
Semi -Annual
Visual
SDO
Clardy
Semi -Annual
Visual o
SDO
Floating Solids
Semi -Annual
/Visual
SDO
Suspended Solids
Semi -Annual
Visual
SDO
Foam
Semi -Annual
Visual
SDO
Oil Sheen
Semi -Annual
Visual
SDO
Other obvious indicators of
stormwater pollution
Semi -Annual
Visual
SDO
Notes:
Frequency the first wsuarmonitoring event during the term of the permit must be performed during the initial analytical monitoring event All subsequent
visual-monitonng will be performed twice per year, once in the spring (April - June) and once in the fall (September - November)
2A-�morntoo ing Type" Visual monilonng requires -a qualitative visual observation of each-stor pwat6 outfall- -No analytical te';tmg of sampling -!s required.. -
3 Sample Location Stormwater Discharge Outfall (SDO)

PART II: STORMWATER MONITORING, CONTROLS AND Page 1 of 5
LIMITATIONS FOR PERMITTED DISCHARGERS
Permit No. NCO038377
SECTION A FINAL LIMITATIONS AND CONTROLS FOR STORMWATER DISCHARGES
During the period beginning on the effective date of the permit and lasting until expiration, the permittee
is authorized to discharge wastewater and stormwater associated with industrial activity Such
discharges shall be controlled, limited and monitored as specified below f �d S
A&
?
1. Stormwater Pollution Prevention Plans
��
The perrruttee shall develop a Stormwater Pollution Prevention Plan, herein after referred to as the Plan
The Plan shall be considered public information in accordance with Part I1I, Standard Conditions, Section
E 10 of this permit The Plan shall include, at a minimum, the following Mems
Site Plan. The site plan shall provide a description of the physical facility and the potential
pollutant sources which may be expected to contribute to contamination of regulated stormwater
discharges. The site plan shall contain the following:
(1) A general location map (USGS quadrangle map, or appropriately drafted equivalent
map), showing the facility's location in relation to transportation routes and surface
waters, and the name of the receiving water(s) to which the stormwater outfall(s)
discharges If the discharge is to a municipal separate storm sewer system, the name of
the municipality and the ultimate receiving waters, and accurate latitude and longitude
of the point(s) of discharge must be shown
(2) A narrative description of storage practices, loading and unloading activities, outdoor
process areas, dust or particulate generating or control processes, and waste disposal
practices
(3) A site map (or series of maps) drawn to scale with the distance legend indicating location
of industrial activities (including storage of materials, disposal areas, process areas, and
loading and unloading areas), drainage structures, drainage areas for each outfall and _
activities occurring in the drainage area, building locations and impervious surfaces, the
percentage of each drainage area that is impervious. For each outfall, a narrative
description of the potential pollutants which could be expected to be present in the
regulated stormwater discharge
(4) A list of significant spills or leaks of pollutants that have occurred at the facility during
the 3 previous years and any corrective actions taken to mitigate spill impacts
(5) Certification that the stormwater outfalls have been evaluated for the presence of non-
stormwater discharges. The certification statement will be signed in accordance with the
requirements found in Part III, Standard Conditions, Section B 11.
b Stormwater Management Plan The stormwater management plan shall contain a narrative
description of the materials management practices employed which control or minimize the

PART II: STORMWATER MONITORING, CONTROLS AND Page 2 of 5
LIMITATIONS FOR PERMITTED DISCHARGERS
Permit No NC0038377
exposure of significant materials to stormwater, including structural and non-structural
measures The stormwater management plan, at a minimum, shall incorporate the following
(1) A study addressing the technical and econorruc feasibility of changing the methods of
operations and/or storage practices to eliminate or reduce exposure of materials and
processes to stormwater. Wherever practicable the pernuttee should consider covering
storage areas, material handling operations, manufacturing or fueling operations to
prevent materials exposure to stormwater. In areas where elimination of exposure is not
practicable, the stormwater management plan shall document the feasibility of diverting
the stormwater runoff away from areas of potential contamination.
(2) A schedule to provide secondary containment for bulk storage of liquid materials,
storage of Section 313 of Title III of the Superfund Amendments and Reauthorization Act
(SARA) water priority chemicals, or storage of hazardous materials to prevent leaks and
spills from contaminating stormwater runoff if the secondary containment devices are
connected directly to stormwater conveyance systems, the connection shall be controlled
by manually activated valves or other similar devices [which shall be secured with a
locking mechanism] and any stormwater that accumulates in the containment area shall
be at a minimum visually observed prior to release of the accumulated stormwater
Accumulated stormwater shall be released if found to be uncontaminated Records
documenting the individual making the observation, the description of the accumulated
stormwater and the date and time of the release shall be kept for a period of five years
(3) A narrative description of Best Management Practices (BMPs) to be considered such as,
but not limited to, oil and grease separation, debris control, vegetative filter strips,
infiltration and stormwater detention or retention, where necessary. The need for
structural BMPs shall be based on the assessment of potential of sources contributing
significant quantities of pollutants to stormwater discharges and data collected through
monitoring of stormwater discharges
(4) Inspection schedules of stormwater conveyances and controls and measures to be taken
to limit or prevent erosion associated with the stormwater systems.
C. Spill Prevention and Response Plan The Spill Prevention and Response Plan shall incorporate a
risk assessment of potential pollutant sources based on a materials inventory of the facility
Facility personnel (or team) responsible for implementing the plan shall be identified in the plan
A responsible person shall be on-site at all tires during facility operations that have the potential
to contaminate stormwater runoff through spills or exposure of materials associated with the
facility operations
d. Preventative Maintenance and Good Housekeeping Program A preventative maintenance
program shall be developed The program shall document schedules of rspectic,:-Is and
maintenance activities of stormwater control systems, plant equipment and systems Inspection
of material handling areas and regular cleaning schedules of these areas shall be incorporated
into the program

PART II: STORMWATER MONITORING, CONTROLS AND Page 3 of 5
LIMITATIONS FOR PERMITTED DISCHARGERS
Permit No NC0038377
e. Training schedules shall be developed and training provided at a minimum on an annual basis
on proper spill response and cleanup procedures and preventative maintenance activities for all
personnel involved in any of the facility's operations that have the potential to contaminate
stormwater runoff. Facility personnel (or team) responsible for implementing the training shall
be identified in the plan
f. The Stormwater Pollution Prevention Plan shall identify a specific position(s) responsible for the
overall coordination, development, implementation, and revision to the Plan Responsibilities for
all components of the Plan shall be documented and position(s) assignments provided
g Plan Amendment The pennittee shall amend the Plan whenever there is a change in design,
construction, operation, or maintenance which has a significant effect on the potential for the
discharge of pollutants via a point source to surface waters The Stormwater Pollution
Prevention Plan shall be reviewed and updated on an annual basis
The director may notify the permittee when the Plan does not meet one or more of the minimum
requirements of the permit. Within 30 days of such notice, the permittee shall submit a time
schedule to the Director for modifying the Plan to meet minimum requirements The permittee
shall provide certification in writing (in accordance with Part III, Standard Conditions, Section
B.11 ) to the Director that the changes have been made.
h Facility Inspections Inspections of the facility and all stormwater systems shall occur at a
minimum on a semiannual schedule, once in the fall (September - November) and once during
the spring (April - June). The inspection and any subsequent maintenance activities performed
shall be documented, recording date and time of inspection, individual(s) making the inspection
and a narrative description of the facility's stormwater control systems, plant equipment and
systems Records of these inspections shall be incorporated into the Stormwater Pollution
Prevention Plan
nwt monitoring as required in Part I, Page 4 of h shall be performed in addition to facility
inspections
Implementation Implementation of the Plan shall include documentation of all monitoring,
measurements, inspections, maintenance activities and training provided to employees, including
the log of the sampling data Activities taken to implement BMPs associated with the industrial
activities, including vehicle maintenance activities, must also be recorded All required
documentation shall be kept on-site for a period of five years and made available to the Director
or his authorized representative immediately upon request
2. Minimum Monitoring and Reporting Requirements
Minimum monitoring and reporting requirements are as follows unless otherwise approved in writing by
the Director of the Division of Water Quality

PART II: STORMWATER MONITORING, CONTROLS AND Page 4 of 5
LIMITATIONS FOR PERMITTED DISCHARGERS
Permit No. NC0038377
a If a facility has multiple discharge locations with substantially identical stormwater discharges
that are required to be sampled, the permittee may petition the Director for representative outfall
status. If it is established that the stormwater discharges are substantially identical and the
permittee is granted representative outfall status, then sampling requirements may be performed
at a reduced number of outfalls
°ePa°
b. a monitoring for color, odor, solids, foam, outfall staining, visible sheens a�no, dry weather
flow shall be performed at all stormwater discharge outfall locations All Ieonrtorrng shall
be docum nted and records maintained with the Stormwater Pollution Prevention Plan. The
initiAl4t& monitoring event shall be performed srmult eo sly with the first analytical
monitoring event and documentation of only this initial 'ia 2monitoring event shall be
submitted along with the required analytical monitoring submittal
C. For purposes of the stormwater sampling required in this permit, all samples shall be collected
from a discharge resulting from a representative storm event (See definitions in Part III, Standard
Conditions). Failure to monitor storm events in accordance with the specified frequency shall
constitute a violation of this permit. If the stormwater runoff is controlled by a detention pond,
the following sampling requirements shall apply:
(1) If the detention pond detains the runoff generated by one inch of rainfall for 24 hours,
visual observations for color, foam, outfall staining, visible sheens and dry weather flow
are required, but analytical sampling shall not be required
(2) If the detention pond discharges only in response to a storm event exceeding a 25 -year,
24-hour storm (See Part I1, Standard Conditions, Section A), the pond shall be considered
a non -discharging stormwater control system and not subject to NPDES requirements,
unless the discharge causes a violation of water quality standards
d Samples analyzed in accordance with the terms of this permit shall be submitted on forms
approved by the Director no later than January 31 for the previous year in which sampling was
required to be performed
e. Analytical results from sampling during the final year of the permit term shall be submitted with
the permit renewal application
f This permit regulates stormwater discharges associated with industrial activity Non-stormwater
discharges which shall be allowed in the stormwater conveyance system are
(1) All other discharges that are authorized by an NPDES permit
(2) Foundation drains, air -conditioner condensate without added chemicals, springs,
waterline and fire hydrant, water frorn footing drains, flows from riparian habits and
wetlands, fire -fighting training and fire system testing
(3) Discharges resulting from fire -fighting

PART II: STORMWATER MONITORING, CONTROLS AND Page 5 of 5
LIMITATIONS FOR PERMITTED DISCHARGERS
Permit No NCO038377
If the storm event monitored and reported in accordance with this permit coincides with a non-
stormwater discharge, the permittee shall separately monitor and report all parameters as
required under the non-stormwater portion of this permit and provide this information with the
stormwater discharge monitoring report
SECTION B. SCHEDULE OF COMPLIANCE
The perrruttee shall comply with stormwater monitoring requirements and controls specified for
stormwater discharges in accordance with the following schedule J,
The Stormwater Pollution Prevention Plan shall be delveoped-and drnpi�me_nted-wi iii 12®
niDii##s-of-the effL-ctiv"'atYcfihrs'permit and updated thereafter -on an annual basis
containment, as specified in Part III, Section A 19 of this permit, shall be ac-eamp - �w
-mandis-ekhe-ef€eet-rve-date-of-thds-per mt
The permittee shall at all times provide the operation and maintenance necessary to operate the
permitted stormwater controls at optimum efficiency

h
TELEPHONE RECORD �i
ti
Date: Project. /� v1 j- L M4,113
Time: Fl �� ` ��/J/j
Return Mr/Mrs 1` fr �al� ��J�`� Representing, tall eta,r
❑ Call to Address
❑ Call from
Telephone: �QY— 1 V b FAX
Subject:
NOTES/
SUMMARY
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NEEDED
1. -el
FOLLOW-UP
9
ACTION(S) f
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BY WHOM/WHEN
1.
2.
2.
3.
3.
4.
4.
5.
5.
cc: Signed

NOTES/ SUMMARY (cont.) I.1

CP&L Mayo NPDES Permit
ti
s
Subject: CP&L Mayo NPDES Permit
Date: Tue, 18 Jul 2000 09:17:33 -0400
From: "Holt, Fred" <[e-mail]>
To: 'Tom Belmck' <[e-mail]>
CC: "Greeson, Xhck" <[e-mail]>, "Cooke, Joanle" <[e-mail]>
Tom,
You may recall that in EPA's September 18,1997 letter that addressed the
reissuance of our NPDES permit for the Mayo facility, they had a comment
regarding metal cleaning wastes. In that letter EPA stated "Both chemical
and non -chemical metal cleaning.wastes are subject to performance standards
for metal cleaning wastes. Although these wastes are not indicated in the
application, they are generally present at steam electric power plants,
unless disposed of in an off-site [manner]."
The response letter of June 23, 2000, stated "Chemical metal cleaning wastes
are currently incinerated. The Division will reexamine non -chemical metal
cleaning wastes."
We have investigated the non -chemical metal cleaning wastes situation. In a
response to our permit modification request of October 1984, non -chemical
metal cleaning wastes (including preheater wash water) were defined as low
volume wastes by your agency (then the Division of Environmental Management)
in a permit modification dated September 1985. This modification was
enacted in accordance with an EPA guidance memo of June 1975 commonly
referred to as the Jordon Memorandum The Jordon Memorandum stated "All
water washing operations are "low volume" while any discharge from an
operation involving chemical cleaning should be included in the metal
cleaning category." Therefore, since 1985, we have implicitly grouped
non -chemical (water washing) wastes into the low volume wastewater category.
As a result our 1996 permit application did not specifically mention
non -chemical metal cleaning wastes.
I hope this information is helpful. Let me know if you have any questions.
Fred Holt
Carolina Power & Light
P.O. Box 327
New Hill, NC 27562
Public Telephone [phone]
CaroNet 772-3558
Mail Code HE&EC
1 of 1 7/18/00 9 42 AM

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CP&L- Mayo Steam
030205- Roanoke RB
Chronology:
1. Draft Permit noticed 7/21/97
2. CP&L Comments received 8/19/97
3 EPA Comments received 9/23/97
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Questions:
1. Status of CG&E, East Bend, Ky appeal?
2. Renotice9
3 Expiration 3/31/02
4. No other comments besides CP&L/EPA?
5. Was construction completed prior to promulgation of 1982 guidelines?
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