NC0081949_technical correction_20040123

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Alan W. Klimek, P.E., Director
January 23, 2004
Mr. Mark Gross
Alcoa Power Generating, Inc.
P.O. Box 576
Badin, North Carolina 28009
A711
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: Modifications to NPDES Permits
Permits: NC0081957
NC0076775
NC0081949
NC0081931
Dear Mr. Gross:
Based on your comments dated December 17, 2003, the Division of Water Quality has modified the Alcoa Power
Generating, Inc. permits. Unfortunately, your comments were submitted after the 30-day comment period and we
were unable to make corrections in the final permits, so they are being made with this modification.
The reference to Special Condition A(3) Penstock Sump Drains has been removed from Permit NC0081957, and
the date for submitting the first DMR has been changed to January 30, 2005 in the following permits: NC0076775,
NC0081957, NC0081949, NC0081931.
Please find enclosed the revised permit pages. The revised pages should be inserted into your permit. The old pages
may then be discarded. All other terms and conditions contained in the original permits remain unchanged and in
full effect. This permit modification is issued under the requirements of North Carolina General Statutes 143-215.1
and the Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency.
If any parts, measurement frequencies or sampling requirements contained in this permit modification 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.
If you have any questions concerning this permit modification, contact Sergei Chernikov at the telephone
number 919-733-5083, extension 594.
cc: NPDES Unit
Mooresville Regional Office / Water Quality Section
Central Files
Sincerely,
%Y7
or„Alan W. Klimek, P.E.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 919 733-5083 (fax) 919 733-0719
An Equal Opportunity Affirmative Action Employer http://h2o.enr.state.nc.us/NPDES

A (1). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - Final
Permit No. NC0081949
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge once -through cooling water from outfall(s)
serial number 001, 002 and 003. Such discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT CHARACTERISTICS
Flow (MGD)
Temperature'
pH2
DISCHARGE LIMITATIONS
Monthly
Average Daily Maximum
1
2
Weekly Average
1
2
MONITORING REQUIREMENTS
Effluent Measurement
Frequency
Annual
Annual
Annual
NOTES:
* Sample Location: E — Effluent or at the point closest to discharge where a representative sample of the discharge can feasibly be obtained.
Sample
Type
Estimate
Grab
Grab
Sample
Location*
E
E
1 The temperature of the effluent will be regulated so that the temperature of -the receivingstream does not increase by more than 2.8 °C above the natural water
temperature. In no case should the receiving stream temperature exceed 32 °C due to the facility's operation. Temperature of the effluent may be obtained anywhere
downstream of the heat exchanger effluent that is representative of the discharge.
2 The pH of the effluent shall not be less than 6.0 standard units nor greater than 9.0 standard units, unless ambient river conditions prevent compliance with this range.
The Permittee shall obtain authorization from the Division prior to the useof any chemical additive in the discharge. the permittee shall notify the Director in
writing at least ninety (90) days prior to instituting the use of any additional additive in the discharge which may be toxic to aquatic life (other than additives
previously approved by the division). Such notification shall include the completion of'a Biocide Worksheet Form 101 (if applicable), a copy of the MSDS for the
additive, and a map indicating the discharge point and receiving stream.
Monitoring results obtained during the calendar year shall be recorded and reported on a Discharge Monitoring Report (DMR) form and postmarked no later than January 30th
following the completed reporting period. The first DMR is due January 30' 2005. Samples obtained for monitoring purposes may be collected anytime during the calendar
year.
There shall be no discharge of floating solids or visible foam (other than trace amounts) in the effluent, unless ambient river conditions prevent compliance.

A (2). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - FINAL Permit No. NC0081949
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 — Sump
Drain. Such discharges shall be limited and moni tored by the Permittee as specified below:
EFFLUENT CHARAC fERISTICS
Flow
Oil and Grease'
pH2
DISCHARGE LIMITATIONS
Monthly
Average Weekly Average
15 mg/1
Daily Maximum
20 mg/1
MONITORING REQUIREMENT'S
Effluent Measurement
Frequency
Annual
Annual
Annual
Sample
Type
Estimate
NOTES:
* Sample Locations: E — Effluent or at the point closest to discharge where a representative sample of the discharge can feasibly be obtained.
Grab
Grab
Sample
Location'
E
1 The tailrace shall be visually inspected for oil sheen attributed to facility operations on a weekly basis in conjunction with inspections of the floor sump and rope skimmer.
Confirmation that a visual inspection was conc ucted shall be recorded in the operating 1pg for the facility and provided to the Division upon request.
2. The pH of the effluent shall not be less than 6.') standard units or greater than 9.0 standard units, unless ambient river conditions prevent compliance with this range.
Best Management Practices (BMPs) must be employed to ensure that excessive pollutantsare not discharged to the surface water of the state. These practices
should include as a minimum, routine maintenai ice of the rope skimmer type oil/water separator and cleaning accumulated sediment in the bottom of the sump
annually.
Chemical wheel pit cleaning is permitted on a moni hly basis. When wheel pit cleaning occurs, the tailrace shall be inspected visually for foam and oil. Cleaning shall be
conducted only with pre -approved solvents. Shouli I the Permittee wish to change'solvents, a written request should be made to the Division including the MSDS for the
proposed solvent.
Mechanical cleaning operations, which do not cont ibute any wastewater to the discharge are not limited by this permit. Non -discharging cleaning operations may be
conducted as often as necessary to ensure safety an l proper facility operation.
The Permittee shall obtain authorization from tl►e Division prior to the use of any chemical additive (i.e. biocides) in the discharge. The permittee shall notify the
Director in writing at least ninety (90) days prio r to instituting the use of any additional additive in the discharge, which may be toxic to aquatic life (other than
additives previously approved by the division). -inch notification shall include the completion of Biocide Worksheet Form 101 (if applicable), a copy of the MSDS
for the additive, and a map indicating the dischi. rge point and receiving stream:
Monitoring results obtained during the calendar yer shall be recorded and reported on a Discharge Monitoring Report (DMR) form and postmarked no later than January 30th
following the completed reporting period. The firs DMR is due January 30' 2005. Samples obtained for monitoring purposes may be collected anytime during the calendar
year.
There shall be no discharge of floating solids or visible foam (other than trace amounts) in the effluent, unless ambient river conditions prevent compliance.