NC0004979_Permit Modification_19960904

4 �
4 State of North Carolina
Department of Environment,
" Health and Natural Resources•
Division of Water Quality
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary ED FE H N F1
A. Preston Howard, Jr., P.E., Director -
September 4, 1996
Mr. John S. Carter
Duke Power Company
Electrical Systems Support
Environmental Division / Water Protection
13339 Hagers Ferry Road
Huntersville, North Carolina 28078-7929
Dear Mr. Carter:
Subject: NPDES Permit Issuance
Permit No. NC0004979
Plant Allen Steam Station
Gaston County
In accordance with the application for discharge permit received on February 1, 1996, the Division is
forwarding herewith the subject state - 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 December 6, 1983.
This permit authorizes the bypass of the sand filter in the waste treatment system. The monitoring
requirements for BOD and Fecal Coliform in outfall 002 shall not become effective until the sand filter is bypassed.
Please note that the monitoring frequency for arsenic and selenium has been changed in the final permit. Based on
the nature of this discharge and the environmental concerns surrounding these parameters, monitoring has been given
on a monthly frequency. Please note that this is a decrease from the normal weekly monitoring required as a result
of the past compliance with these permit limits.
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 redeipt of
this letter. This fequest 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, Post Office Drawer 27447, Raleigh,
North Carolina 27611-7447. Unless such a demand is made, this permit shall be final and binding.
Please take notice that this permit is not transferable. 'Part II, E.4. addresses the requirements to be
followed in case of change in ownership or control of this discharge.
This permit does not affect the legal requirements to obtain other permits which may be required by the
Division of Water Quality or permits required by the Division of Land Resources, Coastal Area Management Act, or
any other Federal or Local governmental permits may be required.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

If you have any questions or
number [phone], extension 553.
cc: Central Files
Mr. Roosevelt Childress, EPA
Mooresville Regional Office, Wat
Permits and Engineering Unit
Facility Assessment Unit
Aquatic Survey and Toxicology U
additional information, please contact Mr. Mark McIntire, telephone
Quality
Sincerely,
Grigina9 Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E.

Permit No. NC0004979
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1,
other lawful standards and regulations promulgated and adopted by the North Carolina
Environmental Management Commission, and the Federal Water Pollution Control Act, as
amended,
Duke Power Company
is hereby authorized to discharge wastewater from a facility located at
Plant Allen Steam Station
NCSR 2525
south of Belmont
Gaston County
to receiving waters designated as Catawba and South Fork Catawba Rivers in the Catawba River
Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in
Parts I, II, III and IV hereof.
This permit shall become effective October 1, 1996
This permit and authorization to discharge shall expire at midnight on August 31, 2001
Signed this day September 4, 1996
A. Preston Howard, Jr., P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

is hereby authorized to:
Continue to discharg
operate a septic tank
discharge miscellane
miscellaneous non -c
filter backwash (out]
South of Belmont in
2. After receiving an Aut
construct and operate
pond (outfall 002), an
Permit No. NC0004979
TO PERMIT COVER SHEET
Duke Power Company
once -through, non -contact cooling water (outfall 001),
ind filter and ash pond with pH adjustment (outfall 002),
is non -contact cooling waters (outfall 003) and discharge
tact cooling water, vehicle washwater, intake screen and
1004) from a facility located at Plant Allen, NCSR 2525,
Caston County (See Part III of this Permit), and
orization to Construct from the Division of Water Quality,
groundwater remediation system discharging into the ash
3. Discharge from said treatment works at the location specified on the attached map
into the Catawba Rive
(outfalls 002 and 004) and the South Fork Catawba River
(outfalls 001 and 0)3)�which are classified Class WS -IV & B CA and WS -V
waters, respectively, in the Catawba River Basin.

A. (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Permit No. NC0004979
During the period beginning on the effective date of the permit and lasting until .expiration, the Permittee is authorized to discharge from _
outfall(s) serial number 001. Such discharges shall be limited and monitored by the Permittee as specified below:
Efflu_ent_Uharact_eristics _iji_scna_r_ge i,imitatnons ivionn.orulK nCyuireineilw
Lbs/dav Units (specify) Measurement Sample Sampler
Mon.. Avg. Daily Max. Mon. Avg. Daily Max. Frequency Type Location
plow Daily Pump Logs E
Temperature (°F)2 * Daily Grab or Instantaneous E
Notes:
I Sample Locations: E - Effluent
2 The Regional Administrator has determined pursuant to Section 316(a) of the Act that the thermal component of the discharge assures the protection and
propagation of a balanced, indigenous population of shellfish, fish and wildlife in and on the receiving body of water.
Temperature shall not exceed 35°C (95°F) during the period October 1 through May 31 and 38.9°C (102.0°F) during the period June 1 through
September 30.
Chlorination of the once through cooling water, discharged through outfall 001, is not allowed under"this permit. Should Duke Power wish to chlorinate
its once through cooling water, a permit modification must be requested and received prior to commencing chlorination.

604
^�7\ Mt P pasa ; n
3895
•� , n\� :' \ App Oy rLry
Z S'•n� �• ' � � p0 Oy 0^ - AAO .
,\� CEJ :) � � \\��yocp,. • p ,�h 0 4
e
- pa
m
„T�
' � •e j�!
h112
' '" Opt 90•�pa '- . - " , ���. o U
603
�. a...+' Tail(r,gs Pond b
3693
55
10
•�.602 h
Lou. 35°10'30' '' h
• Lcn9;et°00'23• i 3892
A-1
/
LowerAr strong
n „ rid e
.O,
N
ROAD CLASSIFICATION
PRIMARY HWY LIGHT-DUTY ROAD, HARD OR
HARD SURFACE.... IMPROVED SURFACE....
SECONDARY H WY
HARD SURFACE.... UNIMPROVED ROAD-
--Latitude See Map" Longitude See M "
Map # G14NE Sub -basin 03083;
Stream Class WS-1V&B CA / WS -V
Discharge Class Industrial/ Domesti
Receiving Stream Catawba/ South ForkCat wba
Design Q NQL Permit expires
QUAD LOCATION Duke•Power - Plant Allen
NC0004979
% Gaston County
WWTP
' t
604
^�7\ Mt P pasa ; n
3895
•� , n\� :' \ App Oy rLry
Z S'•n� �• ' � � p0 Oy 0^ - AAO .
,\� CEJ :) � � \\��yocp,. • p ,�h 0 4
e
- pa
m
„T�
' � •e j�!
h112
' '" Opt 90•�pa '- . - " , ���. o U
603
�. a...+' Tail(r,gs Pond b
3693
55
10
•�.602 h
Lou. 35°10'30' '' h
• Lcn9;et°00'23• i 3892
A-1
/
LowerAr strong
n „ rid e
.O,
N
ROAD CLASSIFICATION
PRIMARY HWY LIGHT-DUTY ROAD, HARD OR
HARD SURFACE.... IMPROVED SURFACE....
SECONDARY H WY
HARD SURFACE.... UNIMPROVED ROAD-
--Latitude See Map" Longitude See M "
Map # G14NE Sub -basin 03083;
Stream Class WS-1V&B CA / WS -V
Discharge Class Industrial/ Domesti
Receiving Stream Catawba/ South ForkCat wba
Design Q NQL Permit expires
QUAD LOCATION Duke•Power - Plant Allen
NC0004979
% Gaston County
WWTP

_ r
A. (2). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Permit No. NC000497(J
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from
outfall(s) serial number 002. Such discharges shall be limited and monitored by the Permittee as specified below:
1"I'fluent Characteristics
Discharge_ Limitations
Monitoring_Requirements
Lbs/day
Units
(specify)
Measurement
Sample Sample)
Mon.
Mon. Avg. Daily
Max. Mon. Avg.
Daily Max.
Frequency
Type Location
Flow
instantaneous
E
Oil and Grease
15.0 mg/I
20.0 mg/l
Monthly
or estimate
Grab
E
T01,11 Suspended Solids
30.0 mg/l
100.0 mg/l
Monthly
Grab
E
1301), 5 Day, 20°C2
Monthly
Grab
E
Fecal Coliform2
Monthly
Grab
E
Total Copper
'Total
1.0 mg/l
Monthly
Grab
E
iron
1.0 mg/1
2/Month
Grab
E
Total Arsenic
314.0 µg/l
Monthly
Grab
E
Total Selenium
'1,01,11
31.0 µg/l
Monthly
Grab
E
Phosphorus
Semi -Annually
Grab
E
Total Nitrogen (NO3+No2+TKN)
Semi -Annually
Grab
E
Chronic Toxicity3
Quarterly
Grab
E
Total Chromium
Quarterly
Grab
E
i'he,1014
Monthly
Grab
E
Naphlhalenea
Monthly
Grab
E
Notes:
1 Sample Locations: E - Effluent
Monitoring shall begin after bypassing the sand filtration unit and shall only be required while the sand filter is being bypassed. The first sample taken
upon bypass shall be timed in accordance with the hydraulic retention time of the treatment system. Sampling will then occur monthly thereafter.
3 Chronic Toxicity (Ceriodaphnia) PAF @ 16.0%; January, April, July and October; See Part III, Condition E.
4 Monitoring for these parameters shall begin immediately upon commencement of groundwater remediation activities and shall continue until such
activities are completed.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored weekly at the effluent by grab sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. (3). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Permit No. NC0004979
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from
outfall(s) serial number 003. Such discharges shall be limited and monitored by the Permittee as specified below:
Efiluent Characteristics Discharge Limita_ tions Monitoring Requirements
Lbs/day Units (specify) Measurement Sample .Sampler
Mon. Avg. Daily Max. Mon. _Avg. Daily Max. Frequency Tyne Location
Flow Weekly Estimate E
Notes:
Sample Locations: E - Effluent
Chlorination of the once through cooling water, discharged through outfall 003, is not allowed under this permit. Should Duke Power wish to chlorinate
its once through cooling water, a permit modification must be requested and received prior to commencing chlorination.

' Part III
Permit No. NC0004979
E. CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic
Bioassay Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of _reproduction or
significant mortality is 16.0% (defined as treatment two in the North Carolina procedure
document). The permit holder shall perform quarterly monitoring using this procedure to establish
compliance with the permit condition. The first test will be performed after thirty days from the
effective date of this permit during the months of January, April, July, October. Effluent
sampling for this testing shall be performed at the NPDES permitted final effluent discharge below
all treatment processes.
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 TGP3B. Additionally, DEM Form AT -1 (original) is to be sent to the following address:
Attention:
Environmental Sciences Branch
North Carolina Division of
Water Quality
4401 Reedy Creek Road
Raleigh, N.C. 27607
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 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 any test data from this monitoring requirement 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 retesting(within 30 days of initial monitoring event). Failure to submit
suitable test results will constitute noncompliance with monitoring requirements.
F. 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. Completion of Biocide Worksheet 101 is not necessary for those outfalls
containing toxicity testing. Division approval is not necessary for the introduction of a new biocide
into an outfall currently being tested for toxicity.
G. There shall be no discharge of polychlorinated biphenyl compounds.

A. (4). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Permit No. NC0004979 -
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from
outfall(s) serial number 004. Such discharges shall be limited and monitored by the Permittee as specified below:
Erfluent_Characte_r_istics Discharge Limitations Monitoring Requirements
Lbs/day Units (specify) Measurement Sample Sampler
Mon. Avg. Daily Max. Mon. Avg. Daily Max. Frequency Type Location
Flow Weekly Estimate E
Oil and Grease 15.0 mg/l 20.0 mg/1 2/Month Grab E
Notes:
Sample Locations: E - Effluent
Chlorination of the once through cooling water, discharged through outfall 004, is not allowed under this permit. Should Duke Power wish to chlorinate
its once through cooling water, a permit mode ica ion mus be rem and receive prior o commencing chloriteion.

H. It has been determined from information submitted that the plans and procedures in place at
Allen Steam Station are equivalent to that of a BMP.
I. The permittee shall report the presence of cenospheres observed in any samples.
J. The applicant is permitted to discharge chemical metal cleaning wastes to the ash basin under the
conditions outlined in the 1976 Riverbend Ash Basin Equivalency Demonstration and the 1994
Allen Steam Station permit application.
K. The permittee shall check the diked areas for leaks by a visible inspection and shall report any
leakage detected.
L. If the permittee, after monitoring for at least six months, determines that he is consistently
meeting the effluent limits contained herein, the permittee may request of the Director that the
monitoring requirement be reduced to a lesser frequency.
M. Nothing contained in this permit shall be construed as a waiver by the permittee or any right to
a hearing it may have pursuant to State or Federal laws or regulations.