NC0004987_Issuance of Permit_20010629

o�OF W A rFRQG Michael F. Easley
©pwA Governor
O w William G. Ross, Jr., Secretary
NCDENR North Carolina Department of Environment and Natural Resources
Kerr T. Stevens, Director
Division of Water Quality
June 29, 2001
Mr. Michael A. Ruhe, MG03A5
Manager, Water Compliance
Duke Power Company
13339 Hagers Ferry Road
Huntersville, North Carolina 28078-7929
Subject: Issuance of NPDES Permit NC0004987
Marshall Steam Station
Catawba County
Dear Mr. Ruhe:
Division personnel have reviewed and approved your application for renewal of the subject permit.
Accordingly, we are forwarding the attached NPDES discharge permit. This permit is issued pursuant to the
requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North
Carolina and the U.S. Environmental Protection Agency dated May 9, 1994 (or as subsequently amended).
The NPDES Unit has reviewed the draft permit comments prepared by Mr. Ron Lewis of your office and
transmitted to the Division on December 15, 2000 and has modified the final permit to accommodate those
comments.
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 demand is made, this decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division may require
modification or revocation and reissuance of the permit. This permit does not affect the legal requirements to
obtain other permits which may be required by the Division of Water Quality or permits required by the Division of
Land Resources, the Coastal Area Management Act or -any other Federal or Local governmental permit that may be
required.
If you have any questions concerning this permit, please contact the NPDES Unit at [phone].
Sincerely,
Original Signed By
David A. Goodrich
Kerr T. Stevens -
cc: Central Files
Mooresville Regional Office, Water Quality Section
\PDES Unit
Point Source Compliance/ Enforcement Unit
EPA Region IV
Aquatic Toxicology Unit
1617 MAIL SERVICE CENTER, RALEIGH, NORTH CAROLINA 27699-1617 - TELEPHONE [phone]/FAX [phone]
AN EQUAL OPPORTUNITY AFFIRMATIVE ACTION EMPLOYER - 50% RECYCLED/ 10% POST -CONSUMER PAPER
VISIT US ON THE WEB AT http://h2o.enr.state.nc.us/NPDES

Permit No. NC0004987
SUPPLEMENT -TO PERMIT. COVER SHEET
Duke Power Company
is hereby authorized to:
1. Continue to discharge once -through cooling water and intake screen backwash through outfall
001; treated wastewater (consisting of metal cleaning wastes, coal pile runoff, ash transport
water, domestic wastewater, and low volume wastes) from the ash settling basin through
outfall 002; yard sump overflows through outfalls 002A and 002B; and non -contact cooling
water from the induced draft fan control house through outfall 003. All discharges result
from activities at Duke Power's Marshall Steam Station at the intersection of NC Highway
150 and NCSR 1841 in Terrell, Catawba County; and
2. Discharge from said treatment works at the locations specified on the attached map into the
Catawba River (Lake Norman) which is classified WS -IV and B CA waters in the Catawba
River Basin.

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Permit No. NC0004987
.i
SUPPLEMENT TO EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
SPECIAL CONDITIONS (Continued)
A (12). BEST MANAGEMENT PRACTICES
It has been determined from information submitted that the plans and procedures in place at Marshall Steam
Station are equivalent to that of a Best Management Practice (BMP).
A (13). CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QUARTERLY)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 12%.
The permit holder shall perform at a minimum, auarterJv monitoring using test procedures outlined in the
"North="Carolina Ceriodaphnia Chronic Effluent Biodssay Proce&ure," Revised l_`ebivary 1998: or subsequent'
versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February
1998) or subsequent versions. The tests will be performed during the months of February, May, August, and
November. Effluent sampling for this testing shall be performed at the NPDES permitted final effluent
discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the
permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the two following
months as described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -
February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the highest
concentration having no detectable impairment of reproduction or survival and the lowest concentration that
does have a detectable impairment of reproduction or survival. The definition of "detectable impairment,"
collection methods, exposure regimes, and further statistical methods are specified in the "North Carolina
Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR -1) for the months in which tests were performed, using the parameter code TGP,3B for
the pass/fail results and THP6B for the Chronic Value. Additionally, DWQ Form AT -5 (original) is to be sent
to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Water Quality
1621 Mail Service Center
Raleigh, North Carolina 2 7699-1 62 1
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch no later than 50
days after the end of the reporting period for which the report is made. -
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate
signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is
employed for disinfection of the waste stream.

A (15). CONTINUED...
The application of physical/chemical methods of treating wastes has also been demonstrated to be effective in
the treatment of metal cleaning wastes. However, the effectiveness of ash pond treatment should be considered
in relation to the small differences in effluent quality realized between the two methods.
It has been demonstrated that the presence of ions of copper, iron, nickel, and zinc in the ash pond waters was
not measurably increased during the ash pond equivalency demonstration at the Duke Power Company's
Riverbend Steam Station. Therefore, when the following conditions are implemented during metal cleaning
procedures, effective treatment for metals can be obtained at this facility:
- (1) la, -g-_ ash -basin -.providing pote-ntial-.reaction volumes. -
(2) Well-defined shallow ash delta near the ash basin influent.
(3) Ash pond pH of no less than 6.5 prior to metal cleaning waste addition.
(4) Four days retention time in ash pond with effluent virtually stopped.
(5) Boiler volume less than 86,000 gallons.
(6) Chemicals for cleaning to include only one or more of the following:
(a) Copper removal step- sodium bromate, NaBrO3; ammonium carbonate, (NH4)2COs; and ammonium
hydroxide, NH,OH.
(b) Iron removal step -hydrochloric acid, HCI; and ammonium bifluoride, (NHq)HF2 and proprietary
inhibitors.
(7) Minimum dilution of wastes before entering ash pond 6 to 1.
(8) After treatment of metal cleaning wastes, if monitoring of basin effluents as required by the permit
reveals discharges outside the limits of the permit. permittee will re -close the basin discharge, conduct
such in -basin sampling as necessary to determine the cause of nonconformance, will take appropriate
corrective actions, and will file a report with EPA including all pertinent data.
A (16). FLOATING MATERIALS
The Permittee shall report all visible discharges of floating materials, such as an oil sheen, to the Director
when submitting DMRs.
A (17). DIKE INSPECTIONS
The permittee shall check the diked areas for leaks by a visible inspection and shall report any leakage
detected.
A (18). CHEMICAL DISCHARGES
Discharge of any product registered under the Federal Insecticide, Fungicide, and Rodenticide Act to any waste
stream which may ultimately be released to lakes, rivers, streams or other waters of the United States is
prohibited unless specifically authorized elsewhere in this permit. Discharge of chlorine from the use of
chlorine gas, sodium hypochlorite, or other similar chlorination compounds for disinfection in plant potable and
service water systems and in sewage treatment is authorized. Use of restricted use pesticides for lake
management purposes by applicators licensed by the N.C. Pesticide Board is allowed.

Duke
Power.
A Duke Energy Company
December 15, 2000
Duke Power
Group Environment, Health d' Safety
MG03A5
13339 Hagers Ferry Road
Huntersville, NC 28078-7929
Mr. Charles Weaver, NPDES Unit
Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617 DEC 19 2000
Subject: Marshall Steam Station D1 ria -tiY(? Q•,,,.,
Draft NPDES Permit Number NC0004987 ! PONT � �
Effective Date on or about January 3, 2001
Certified Mail 7099 3400 0003 7612 4362
Dear Mr. Weaver:
Attached are comments and suggested revisions to the draft NPDES permit for Marshall
Steam Station, including revisions marked on draft pages of the proposed permit. A
major concern is the proposed limit for manganese at outfall 001. Duke Power requests
that the limit and monitoring for manganese be deleted. As we discussed per our phone
conversations, the concentration of manganese in this outfall is reflective of seasonal
changes of the manganese concentration in the intake water withdrawn from 60 to 70 feet
below the full pond level of Lake Norman (see attached figure). This seasonal
fluctuation of the manganese concentration is a natural process associated with annual
stratification and destratification of Lake Norman that is common in most lakes. Water
quality and biological monitoring programs of Lake Norman have noted no adverse
impact associated with the withdrawal and discharge of condenser cooling water from
Lake Norman, as described since commercial operation of Marshall began in 1970.
If you have any questions concerning this report, please contact Ron Lewis (704)-875-
5968 or me (704)-875-5961.
Sincerely,
1/V1V/L, (—�
� /'?�
Michael A. Ruhe
Manager, Water Compliance
rel
attachments

Marshall Steam Station Draft NPDES Permit NC0004987
Comments and Suggested Revisions
(also refer to marked revisions on a copy of draft pages of the proposed permit)
Comment on Lake Norman Quad:
• noted that longitude and latitude listed for outfalls is slightly different than in the
permit application
f `J • the description for outfalls 002A and 002B the word "River" needs to be inserted
following Catawba for description of receiving stream
Comments on Part I.A(1).:
• delete limit and monitoring requirement for manganese. As previously noted
seasonal fluctuations of manganese in the effluent from outfall 001 is related to the
1 concentration of manganese in the inlet water withdrawn from Lake Norman (see
attached figure).
'� .� J' • misspelling of the words "component" and "temperature" in the second sentence
below the effluent limit table
4ti3'�Z
Comments on Part I.A(2).:
�� • request the daily maximum limit for total suspended solids not be change from 65
mg/L to 50 mg/L, as proposed. The requirement for a total suspended lids limit of
50 mg/L is not required per the Steam Effluent Guidelines 40CFR42 .13(h) that
pertains to coal pile runoff. Marshall is exempt since the wastewater treatment
system is designed to treat coal pile runoff from a 10 year, 24 hour rainfall event.
�/• request that monitoring for copper and iron concentrations only be required when
z chemical metal cleaning is conducted. The Steam Effluent Guidelines,
ti� jam; 40CFR423.13(e), list limits for copper and iron concentrations when chemical metal
cleaning is conducted. Marshall's compliance history also supports this request.
y Suggest replacing the word "monthly" with the words "see note 3" in the
",q --
measurement frequency column and inserting the following note and renumbering
notes in the NOTES list:
,J Monitoring shall be per occurrence of chemical metal cleaning and samples shall
be from a representative discharge."
/Comments on Part I.A(3) and Part I.A(4):
• in footnote 1 at the end of the sentence on both pages the word "Yadkin" needs to be
@y replaced with "Catawba"
,/Comments on Part I.A(6):
• In the third paragraph delete the comma following the word "term"
`Comments on Part I.A(12):
• the word "Buck" in the sentence should be replaced with the word "Marshall"
Comments on Part I.A (15) (6) (b):
0 the formula for ammonium bifluoride should be changed to (NH4)HF2

„-,,,,,-Comments on Part I.A(19):
• replace the word "or” with the word "of' for clarification of this sentence
Comments on Part II.A.2. on page 1 of 14:
• delete the word "Health" to reflect the correct name for NCDENR
Comments on Part II.C.5.c.(3) on page 9 of 14:
• this sentence should refer to "Part II, EA(b) (2)" instead of "Part II, E.6.(b) (B)"
Comments on Part II.D.2. on page 10 of 14:
• the mailing address needs to be changed to reflect the new mailing address
Comments on Part II.E.2.c. on page 10 of 14:
• the letter "n" needs to be deleted from "alternation" in the second sentence

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Permit No. NC0004987
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS
A (6). DEFINITIONS
The term 'low volume waste sources" means, taken collectively as if from one source, wastewater from all
sources except those for which specific limitations are otherwise established in this part. Low volume wastes
sources include, but are not limited to: Wastewater from wet scrubber air pollution control systems, ion
exchange water treatment system, water treatment evaporator blowdown, laboratory and sampling streams,
boiler blowdown, floor drains, and recirculating house service water systems. Sanitary and air conditioning
wastes are not considered low volume wastes.
The term "metal cleaning waste" means any wastewater resulting from cleaning (with or without chemical
cleaning compounds) any metal process equipment including, but not limited to, boiler tube cleaning, boiler
fireside cleaning, and air preheater cleaning.
The term. "chemical metal cleaning waste" means any wastewater resulting from the cleaning of any metal
process equipment with chemical compounds, including, but not limited to, boiler tube cleaning. Chemical
metal cleaning will be conducted according to approved Duke Power equivalency demonstration.
A (7). TOXICITY REOPENER CONDITION
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
indicate that detrimental effects may be expected in the receiving stream as a result of this discharge.
A (8). MONITORING FREQUENCIES
If the Permittee, after monitoring for at least six months, determines that effluent limits contained herein are
consistently being met, it may be requested of the Director that the monitoring requirements be reduced to a
lesser frequency.
A (9). POLYCHLORINATED BIPHENYL COMPOUNDS
There shall be no discharge of polychlorinated biphenyl compounds such as those commonly used for
transformer fluid.
A (10). BIOCIDE CONDITION
The permittee shall not use any biocides except those approved in conjunction with the permit application. The
permittee shall notify the Director in writing not later than ninety (90) days prior to instituting use of any
additional biocide used in cooling systems which may be toxic to aquatic life other than those previously
reported to the Division of Water Quality. Such notification shall include completion of Biocide Worksheet
Form 101 and a map locating the discharge point and receiving stream.
A (11). INTAKE SCREEN BACKWASH
Continued intake screen backwash discharge and overflow from the settling basin are permitted without
limitations or monitoring requirements.

Permit No. NCO004987
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS (Continued)
A (12). BEST MANAGEMENT PRACTICES
It has been determined from information submitted that the plans and procedures in place at Buck Steam
Station are equivalent to that of a Best Management Practice (BMP).
A (13). CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QUARTERLY)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 12%.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the
"North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent
versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February
1998) or subsequent versions. The tests will be performed during the months of February, May, August, and
November. Effluent sampling for this testing shall be performed at the NPDES permitted final effluent
discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the
permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the two following
months as described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -
February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the highest
concentration having no detectable impairment of reproduction or survival and the lowest concentration that
does have a detectable impairment of reproduction or survival. The definition of "detectable impairment,"
collection methods, exposure regimes, and further statistical methods are specified in the "North Carolina
Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR -1) for the months in which tests were performed, using the parameter code TGP3B for
the pass/fail results and THP3B for the Chronic Value. Additionally, DWQ Form AT -3 (original) is to be sent
to the following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Water Quality
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, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate
signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is
employed for disinfection of the waste stream.

Permit No. NC0004987
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS (Continued)
A (15). CONTINUED...
The application of physical/chemical methods of treating wastes has also been demonstrated to be effective in
the treatment of metal cleaning wastes. However, the effectiveness of ash pond treatment should be considered
in relation to the small differences in effluent quality realized between the two methods.
It has been demonstrated that the presence of ions of copper, iron, nickel, and zinc in the ash pond waters was
not measurably increased during the ash pond equivalency demonstration at the Duke Power Company's
Riverbend Steam Station. Therefore, when the following conditions are implemented during metal cleaning
procedures, effective treatment for metals can be obtained at this facility:
(1) Large ash basin providing potential reaction volumes.
(2) Well-defined shallow ash delta near the ash basin influent.
(3) Ash pond pH of no less than 6.5 prior to metal cleaning waste addition.
(4) Four days retention time in ash pond with effluent virtually stopped.
(5) Boiler volume less than 86,000 gallons.
(6) Chemicals for cleaning to include only one or more of the following:
(a) Copper removal step- sodium bromate. NaBrO,; ammonium carbonate, (NH4)2COs; and ammonium
hydroxide, NH,OH.
(b) Iron removal step -hydrochloric acid, HCl; and ammonium bifluoride. (NH4)BF2 and proprietary
inhibitors.
(7) Minimum dilution of wastes before entering ash pond 6 to 1.
(8) After treatment of metal cleaning wastes, if monitoring of basin effluents as required by the permit
reveals discharges outside the limits of the permit. permittee will re -close the basin discharge, conduct
such in -basin sampling as necessary to determine the cause of nonconformance, will take appropriate
corrective actions, and will file a report with EPA including all pertinent data.
A (16). FLOATING MATERIALS
The Permittee shall report all visible discharges of floating materials, such as an oil sheen, to the Director
when submitting DMRs.
A (17). DIKE INSPECTIONS
The permittee shall check the diked areas for leaks by a visible inspection and shall report any leakage
detected.
A (18). CHEMICAL DISCHARGES
Discharge of any product registered under the Federal Insecticide. Fungicide, and Rodenticide Act to any waste
stream which may ultimately be released to lakes, rivers, streams or other waters of the United States is
prohibited unless specifically authorized elsewhere in this permit. Discharge of chlorine from the use of
chlorine gas, sodium hypochlorite, or other similar chlorination compounds for disinfection in plant potable and
service water systems and in sewage treatment is authorized. Use of restricted use pesticides for lake
management purposes by applicators licensed by the N.C. Pesticide Board is allowed.

Permit No. NC0004987
SUPPLEMENT TO EFFLUENT LIMITATIONS
AND MONITORING REQUIREMENTS
SPECIAL CONDITIONS (Continued)
A U9). WAIVERS
Nothing contained in this permit shall be construed as a waiver by permittee or any right to a hearing it may
have pursuant to State or Federal laws or regulations.

M
Part II
Page 1 of 14
PART II .
STANDARD CONDITIONS FOR NPDES PERMITS
SECTION A. DEFINITIONS
1. Permit Issuing Authoritv
The Director of the Division of Water Quality.
2. PM or -the Division-
Means
ivisi n
Means the Division of Water Quality, Department of Environment, Health and Natural Resources.
3. EMC
Used herein means the North Carolina Environmental Management Commission.
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. Ma5s/Day 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 limitation 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 limitation 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.

Part II
Page 9 of 14
S. U sn a st
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) ( of this permit.
(4) The permittee complied with any remedial measures required under Part Il, 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 NODS 143-2153 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 permit issued
by the Permit Issuing Authority for the utilization/disposal of sludge maybereopened 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 failures either by
means of alternate power sources, standby generators or retention of inadequately treated effluent.

Part H
Page 10 of 14
SECTION D. MONITORING AND RECORDS
1. 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 joins 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 during the previous month(s) shall be summarized for each month and
reported on a monthly Discharge Monitoring Report (DMR) Form (DEM No. MR 1, 1.1, 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 submitted to the
following address: j
Division of Water Quality cl Y,6 -c
Water Quality Section
ATTENTION: Central Files -ew a, -4m S
Post Office Box 24535
Raleigh, North Carolina 27626-0535
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 permit 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(g), 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 and

Part II
Page 12 of 14
SECTION E. REPORTING REQUIREMENTS
I. Change in Discharge
All discharges authorized herein shall be consistent with the tenons 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 alterhation, 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 Noncom liance
The permittee 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. Monitoring 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 permit) 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.

r Duke
rPbwer-
ADuk,E-V C -p -y
November 30, 2000
NCDENR/DWQ/NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
SUBJECT: Update to Mailing List
CC�'c 1-C4
Duke Power
Group Environment, Health ear Safety
MG03A5
13339 Hagers Ferry Road
Huntersville, NC 28078-7929
Below is the current mailing label that is being used to send Public Notices
To Duke Power. It is incomplete and is causing mail delivery to be delayed.
DUKE POWER COMPANY
13339 HAGERS FERRY ROAD
HUNTERSVILLE, NC 28078
Please update your records so that all future mailings go to:
Mr. Michael A. Ruhe, MG03A5
Manager, Water Compliance
Duke Power Company
13339 Hagers Ferry Road
Huntersville, NC 28078-7929
This vvill expedite the delivery process and eliminate unnecessary delays.
Thank you for your prompt attention to this matter.
You7 rs ruly,
�'14
/414
Michael A. Ruhe
Manager, Water Compliance
MAR/phs

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
November 8, 2000
MEMORANDUM
To: Britt Setzer
NC DENR / DEH / Regional Engineer
tllooresville Regional Office
From. Christie Jackson
NPDES Unit
AO
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Ke Dry -I'. up
4NMONMF,N1:', HF -AL -1-h
& NAT+t}kAL R1rA'WRr'E1
20 2000
111 0 sn"llon-k umpF?°w
Subject: Review of Draft NPDES Permit NC0004987 NNOW. _ kk
Duke Power — Marshall Steam Station
Catawba County
Please indicate below your agency's position or viewpoint on the draft permit and return this form by
December 11, 2000. If you have any questions on the draft permit, please contact me at the telephone
number or e-mail address listed at the bottom of this page.
RESP i SE: (Check one)
Concur with the issuance of this permit provided the facility is operated and maintained properly, the
stated effluent limits are met prior to discharge, and the discharge does not contravene the designated
water quality standards.
1-1
Concurs with issuance of the above permit, provided the following conditions are met:
❑ Opposes the issuance of the above permit, based on reasons stated below, or attached
Date:
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 919 733-5083, extension 538 (fax) 919 733-0719
VISIT us ON THE INTERNET @ http://h2o.enr.state.nc.us/NPDES Christie.Jackson@ ncmail.net

DENR/DWQ
FACT SHEET FOR NPDES PERM
NPDES No. NC000
k Ne
PUBLIC NOTICE
STATE OF NORTH CAROLINA
ENVIRONMENTAL
MANAGEMENT
COMMISSION/NPDES UNIT
1817 MAIL SERVICE CENTER
RALEIGH, NC 278891017
NOTIFICATION OF INTENT TO
ISSUE A NPDES WASTERWATER
PERMIT
On the basis of thorough etett revlaw
and application of NC General Sa•
tute 143.21, Public law 82.500 and
other lawful standards and regula.
tions, the North Carolina Environ.
mental Management Commission
Proposes to Issue a National Pollut•
ant Discharge Elimination System
(NPDES) wastewater discharge per.
mit to the pereon(s) listed on the at.
tached pages effective 45 days from
the Publish date of this notice.
Written comments regarding the pro.
Posed 30 days t
Afterth will
date of thisted
notice. All comments received prior
to that date are considered In the fi.
nal determinations regarding the
Proposed permit The Director of the
NC Division of Water Quality may
decide to hold a public meeting for
the proposed permit should the Divi.
Mon receive a significant degree of
Public Interest.
Copies of the draft Permit and other
supporting information on He used
to determine conditions present in
the draft permit are available upon
request and payment of the casts of
nts and/or
requests Info
reproduction.
lrmation to the NC
Division of Water Quallty at the
above address or call Me, Christie
Jackson at [phone], exten•
elan 538, Pleeee Include the NPDES
permit number (attached) In any
communication. Interested persons
may 1180 visit the Division of Water
Quellty at 512 N. Salisbury Street,
Raleigh, NC 27804.1148 between
the hours of 8:00 a.m. and 5:00 P.m,
to review information on file,
NPDES Permit Number
NC0004987. Duke Power Compa•
nylMarehall Stream Station, 13339
Hopers Ferry Road. Hunteravills, NC
28078 has applied for a permit re-
newal for a facility located In Cataw.
ba County discharging treated
wastewater Into Catawba River
(Lake Norman) In the Catawba River
Basin. Currently no parameters ere
water quality limited, This discharge
may affect future allocations In this
Portion of the receiving stream.
PUBLISH: November 15, 2000,
IT DEVELOPME
4987 �J
NORTH CAROLINA
CATAWBA COUNTy
... ........... ... ....... .4.
being first duly sworn, says: That he or
she is C�G01c� ,D Q,?i>u of the
................. .. . ..
Hickory Daily Record, a n spaper pub-
lished at Hickory, North Carolina; that in
the issues of the said newspaper for the
following days, to wit:
there appeared... �q.. 5a
inches of advertising as per attached namedd
advertiser:
The Hickory Daily Record is a qualified news-
paper within the meaning of section 1-597 of the
General Statutes of N. C.
Affiant
Sworn to and subscribed before me,
this .... Q' day of
.... ..............
tart' Public
My Commission Expires
.............. _......., 20 o.SC
�c_-).
The yard -drain sumps are concrete �i«ucau _ .. ..__o
wastewater from the powerhouse area to the ash basin. These pumps are operated on a rotating oas».
Usually two pumps are set so that one pump is primary and the other is backup. After a selected period
the controls are changed so that different pumps are utilized. The yard -drain sumps collect wastewater
Mar,ihall srcarn Station Fact ,�Ihcer
Ni'I)ES Renewal
P,ou c 1

The ash basin collects stormwater flows from the yard drainage basin, ash removal lines and rainfall runoff
from the basin watershed area. A total of 14.7 acres drain to the yard sumps with an average daily runoff
estimated at 0.05 MGD. The average daily runoff is calculated based on an annual rainfall of 49 inches
with 1.0 and 0.5 runoff coefficients applied appropriately. Trace amounts of oil and grease may be
present in the first flush of stormwater.
Once -through, non -contact cooling water is supplied to eight induced draft (ID) fan motor bearings to
remove excess heat. No chemicals are added to the once -through raw lake water. The rate of flow
through the ID fan heat exchangers that discharges to the yard -drain sumps is approximately 0.08 MGD,
which is pumped to the ash basin.
The track hopper sump collects groundwater from a foundation drain system underneath the track hopper.
The flow is usually intermittent; however, the pump capacity is 100 gpm. On a daily basis it is estimated
that the run time is only 50%, which would correspond to a flow of 0.07 MGD to the yard -drain sumps;
then to the ash basin.
In the event that maintenance activities are needed in the intake or discharge tunnels, a dewatering sump
is provided to remove water from the tunnels. Raw water in the tunnels can be pumped to the yard -drain
sumps that ultimately discharge to the ash basin.
Bore sonic testing of turbine rotors is infrequent, occurring approximately once every 5 years.
Demineralized water is mixed with a corrosion inhibitor, e.g. Immunol 1228, at a ratio of 100 parts water
to 1 part inhibitor. The mixture is applied to the turbine rotors. The excess is drained and mixed with
low volume wastewater and discharged to the ash basin via the yard -drain sumps.
The station utilizes electrostatic precipitators as its air pollution control devices. Under normal plant
operations, the dry ash captured in these precipitators is collected in temporary storage silos for
subsequent disposal in a permitted on-site landfill or for recycling in off-site ash utilization projects. If the
system that collects the dry fly ash is not operating the fly ash can be sluiced to the ash basin. Bottom ash
from the boilers is usually sluiced with water to a holding cell for recycling activities. Pyrites from the mills
are sluiced with water to an ash basin settling cell. Approximately 2.5 MGD of bottom ash and pyrite
sluice is pumped through large steel pipes (ash lines) directly to the ash basin settling cell. Once -through,
non -contact cooling water from the coal pulverizing mill is discharged to the bottom ash hopper and
pumped to the ash basin. The electrostatic precipitators are normally cleaned by mechanically vibrating the
wires and rapping the plates inside the precipitator. Before major precipitator work is performed, they are
cleaned by a wash down.. The wash water is pumped to the ash basin from the yard -drain sump.
A new sanitary waste treatment system was installed during the term of the previous NPDES permit, thus
eliminating the package plant near the intake structure of the plant. An aerated basin provides treatment
with a 50 — day retention time and has a total volume of 587,000 gallons. Effluent from the aerated
basin is polished further through additional residence time in the ash basin. The new system is designed
for 6100 gpd (normal) and 15500 gpd (outage).
The powerhouse lift station was installed as a central collection point to receive all the sanitary waste from
the station and pump it to the aerated basin. The present lift station serving the vendor facilities and Units
5 and 4 were upgraded.
The sanitary system accommodates wastewater flow from the following courses:
• General Plant sanitary wastewater;
Vendor facilities sanitary wastewater; and
Laboratory drains (small amounts of laboratory chemicals used to test wastewater effluents and
high purity boiler water).
Non -point sources of stormwater to the ash basin includes coal pile runoff, a pond area of 82.5 acres and
an up -gradient watershed are of 1097.7 acres. The estimate for stormwater runoff is based on forty-nine
inches of rain per year with a 1.0 and 0.5 runoff coefficient for the pond area and up -gradient watershed,
respectively. The average non -point source stormwater input for the ash basin is estimated at 2.5 MGD.
Mlilr%hall Stearn Station Fact Sheer
N13Di"S lier,en>�i
1",i ge 5)

recommended. Should the presence of Zinc in the effluent be identified as a causative factor of whole
effluent toxicity at any point in the future, installation of a limit is a strong likelihood.
• Outfalls 002a and 002b — Yard -Sump Overflows:
On occasion, the yard -sumps at the station experience overflows. These overflows occur rarely, typically
once per year, and can range in time from less than one hour to several hours. Late in 1998, the Division
developed a permitting strategy for these overflows. Analytical monitoring is required for flow, pH, and
TSS for all overflows lasting longer than an hour. When TSS is reported as greater than 100 mg/L,
monitoring for iron is required. All overflows, regardless of time length, are reported to the DWQ
regional office.
• Outfalls 003 — Non -Contact Cooling Water:
Limitations for this outfall are consistent with non -contact cooling water requirements defined in the
federal guidelines.
TOXICITY TESTING:
Current Requirement: Outfall 002 — Chronic P/F @a 12% using Ceriodaphnia
Recommended Requirement: Outfall 002 — Chronic P/F @ 12% using Ceriodaphnia
No changes in the toxicity testing requirements is recommended. This facility has passed all toxicity tests since
at least January of 1995.
COMPLIANCE SUMMARY:
A review of this facility's effluent data indicates an excellent compliance history with no noted permit limit
violations during the review period
INSTREAM MONITORING:
None Required
PROPOSED CHANGES:
Outfall 001.-- Free available chlorine limitations have been installed and footnoted to only apply if chlorination
commences. A total manganese permit limit has been installed in accordance with the mass balance calculation
based on the results of a reasonable potential analysis.
Outfall 002 The monitoring frequency for total arsenic and total selenium has been reduced from monthly to
quarterly. The pollutant analysis condition is now required once per permit cycle.
Outfalls 002A and 002B: Effluent limitations pages have been installed for the two yard -sumps in the event
that an overflow occurs.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE:
Draft Permit to Public Notice: June 14, 2000
Permit Scheduled to Issue: July 31, 2000
STATE CONTACT:
If you have any questions on any of the above information or on the attached permit, please contact Mark
McIntire at [phone] ext. 555.1
M,u-sh:111 "term st;1non l'oIo .tifs�.c