NC0004979_Renewal 2004_20091203

PDuke
Power®
A Duke Energy Company
November 22, 2004
Mr. David Goodrich
In Care of: Ms. Carolyn Bryant
NC DENR/Water Quality/NPDES Unit
512 N. Salisbury Street
Raleigh, North Carolina 27604
Subject: NPDES Permit Renewal, NC0004979
Allen Steam Station, Gaston County
Dear Mr. Goodrich,
PROCUREMENT, CONSTRUCTION AND
EH &S
Duke Power
EC11E / P.O. Box 1006
g t,
t
Q
r
I` NOV 2 3 2004
L
DENR - WATER QUALITY
POINT SOURCE BRANCH
• �i3�w.ssT�'.�.t..via..,....,.: ., ......., ...::..y.,:rwr,,.,�4;..,ws4,.��
The subject NPDES permit is scheduled to expire on May 31, 2005. As required by North
Carolina Administrative Code (15A NCAC 2H.0105(e)), this permit application for renewal is
being submitted at least 180 days prior to expiration of the current permit.
Please find enclosed in triplicate, the application for renewal, which includes the following
items:
• EPA Form 1
• EPA Form 2C
• EPA Form 2F
• Site maps
• Supplemental Information to the NPDES Application
• The Balanced Indigenous Population (BIP) Report
In review of historical monitoring data for outfall 002 many parameters have been continuously
measured at very low concentrations or below detection levels. It is therefore requested that
these parameters be either eliminated from monitoring requirements or reduced in monitoring
frequency. These parameters are as follows: Barium, BOD, Cadmium, Chromium, Copper,
Cyanide, Fecal Coliform, Naphthalene, Nickel, Phenol, Phosphorus, Sulfate and Zinc.
It is also requested that the current selenium limit is changed from a daily maximum limit to a
monthly average limit for the following reason:
40 CFR 131.36 list the Criterion Maximum Concentration (CMC) and the Criterion Continuous
Concentration (CCC) for selenium at 20 ug/l and 5 ug/l, respectively. Since the current selenium
limit of 31 ug/1 is based on the CCC value of 5 ug/l, the limit should be expressed as a monthly
average value. The Environmental Protection Agency's "Ambient Water Quality Criteria for
Selenium — 1987" document-page 34 and 40 CFR 131.36 also supports this request.
The attached BIP report shows that the balanced indigenous aquatic community in Lake Wylie is
being maintained under the current limits. Accordingly, Duke Energy Corporation requests a
continuation of the thermal limitations that are presently in the NPDES permit.
www.dukepower.com

Duke Energy is willing to meet and discuss any of the above items at your earliest convenience.
If additional information is needed please °contact Robert Wylie at (704) 3824669. Your
cooperation in renewing this NPDES permit is appreciated
Sincerely,
Yk "44 A aA,--
Michael A Ruhe
Manager, Environmental Support
cc: Mr. Rex Gleason — NCDENR, Moorseville, N.0
Ms. Tnsh.MacPherson — NCDENR, Raleigh, N,C. (BIP Report 3 copies)
Attachments

v
' • ' ! '00 0
.. 165 1 h
O
• 001
• 0026
°
WAIM
uoca l
s ao
650
�° r i
004 � r r
� D
002A
O. O
�a o
� � W
• DO �1 `
ii
• N
•
r ` Gum POwee compmy
• ALLEN STEAM STATION
650 �• .
�� : USGS TOPO MAP OF THE AREA
ff ♦ 6, •+ AROUND ALLEN STEAM STATION
f! t �O 650 NPDES PERMITTED OUTFALLS
f
r 1 i FIGURE:
r. -Xn .N1ALLENTOPNPDES. DGN 11 /182004 03'07' 13 PM

P
PlantAllen, GastowCounty
NPDES.Permit No NC0004979
Page 3 of 26
1.0 GENERAL INFORMATION
Plant Allen utilizes waters from the Catawba River for condenser cooling and service
water requirements. A brief discussion of each discharge follows. A schematic flow
diagram of water use, treatment, and discharges indicating typical''(average),flow rates
for individual waste streams at Plant Allen is attached. All flows are based on historical
data where possible or pump design capacities and normal run - times.
2.0 OUTFALL INFORMATION
2.1 Outfall 001 - Condenser Cooling Water (CCW)
The CCW system is a once - through, non - contact cooling water,system that
removes heat rejected from the condensers and` other selected heat exchangers
and then discharges into the South Fork River. Each of the 5 units at Plant Allen
has two condenser cooling pumps. The number of pumps used is dependent on
unit load and intake temperature& with more. pumps running with higher loads,
and intake temperatures.
Units 1 and 2 share a common cooling water supply tunnel served by a total offi4
CCW pumps. Units 3 and 4 also share a tunnel and 4 CCW pumps. Unit 5 has
a separate tunnel and 2 CCW pumps. The common tunnel design enables three
pumps to give Units 1 and'2 or 3 and 4 the equivalent of "I Y2 pump operation.
The 1 Y2 pumps operation adds an economical range or flexibility when units are
on partial load ,and when intake water temperatures are minimal.
Unit No.
1 -Pump GPM
1.5" -Pump GPM
2 -Pump GPM
1
55,500
74,800
83,500
2
55,500 _
74,800
83,500
3 _
83,000
111,200_
1'26,000
4
83,000
111,,200
126,000
5
83,000
_
.126,000
All condenser tubes at Plant Allen are cleaned manually with metal or rubber plugs.
Mechanical cleaning -is required once a year for most units. A leak test is performed
periodically on the condenser tubes. (See section 2.2.6.4.) 'If leaks are detected, then
one method used .to temporarily stop small leaks is to add sawdust to the CCW system,
as previously approved by NCDENR. The sawdust is added at, amounts that will plug the
leaks and not result in an environmental impact. This is a temporary measure until the
unit can come off -line so the leaks can be,permanently repaired.
2.1.1 Asiatic Clam /Debris Filter Backwash
Water for -the Unit 5 CCW water,i"s filtered for any`twigs, leaves and other light
debris, which passed through the intake screens. Asiatic clams, which are

it
Plant Allen, Gaston County
NPDES Permit No NC0004979
Page 4 of 26
common in Lake Wylie and can clog the condenser tubes, ,are also captured in
this filter. This filter Is backwashed once a week for 15 minutes. A maximum
fl' ow, of 3000 GPD'is realized. No other additives are in the backwash water. The
twigs, leaves, clams and other light debris collected in the debris filter are
indigenous to the river and are therefore flushed back with no harmful
environmental consequences.
2.2 Outfall 002 Ash Basin
2.2.1 Boiler Cleaning
All five boilers at Plant Allen are chemically cleaned with the next cleaning as
'needed. The volume of the boilers determines the quantity of chemicals
required for a cleaning. Boilers #1 and #2 each have a waterside volume of
26,700 gallons. The volume of boilers #3, #4, ,and #5 is 40,100 gallons each.
The, volume of dilute waste chemical discharged from unit #1 or #2 during a
cleaning is 294,000 gallons. Thevolume,of diluted waste,chemicals drained
from #3, #4 and #5 totals 450,000 gallons each. These, wastes -are drained
through temporary piping to the permanent ash removal lines, which flow to the
,ash basin. Immediately prior to the beginning of a boiler chemical cleaning
procedure, additional stop logs are,added to the ash basin discharge structure.
This assures longer retention time of the chemical wastes for proper treatment
through dilution, neutralization, precipitation, and ion - exchange as documented
in the Ash ,Basin Equivalency Demonstration (October 1976).
A list of the chemicals and amounts required to clean the-`boilers at Plant Allen
follows:
CLEANING CHEMICALS
Sodium bromate
Ammonium carbonate
Ammonium hydroxide*
Hydrochloric acid*
Thiourea*
Citric acid
Sodium Sulfite
Ammonium bifluoride
Detergent (Triton —X)
Antifoam agent
AMOUNT USED PER UNIT
Boiler #1 ,antd #2 -
550 Ibs
1000 Ibs
X850 gal
3700 gal
1680 Ibs
300 Ibs
100 lbs
1100 Ibs
20 gal
10 gal
Boiler #3, #4,& #5
,550 Ibs
1000 Ibs
950 gal
5500 gal
201,0 Ibs
400 Ibs
100 Ibs
1700 Ibs
20 gal
10 gal
During a chemical metals cleaning these chemicals are present ,in amounts
greater than the reportable quantity as identified under the Comprehensive
Environmental Response, Compensation, and Liability Act (CERCLA). If a spill

Plant Allen, Gaston County
NPDES Permit No NC0004979
Page 5 of 26
of any these chemicals were to occur, in most cases, it would be routed to the
ash basin for treatment.
2.2.2' Stormwater run -off
Storm water run -off enters the ash basin from the from the ash basin's, drainage area,
the yard drainage sump and the coal yard sump. The powerhouse sump discharges Its
rainfall run -off into,the yard `drainage sump. A more ,detail description of the sump
systems and stormwater run -off Is Included In section 3.4
2.2.3 Sanitary Wastes .
Sanitary waste at Plant Allen is treated 'in a septic tank with the effluent from the
septic tank being discharged to the Ash Basin via the Coal Yard sump.
Approximately 150 people are responsible for the load on this system: An
average flow of 4850 GPD is treated by the system. The drinking water well
supplies the drinking water requirements of Plant Allen. Plant Allen is a non -
transient and ,non- community drinking water system. This drinking water,system
is'listed as ID # Q1 -36 -704' in the NCD ENR database.
2.2.4 Ash Sluice
Plant Allen utilizes electrostatic precipitators to remove fly ash from its stack
gases. These precipitators require approximately 10.0 MGD for fly ash sluicing
to the ash basin. Bottom ash sluicing to the basin requires approximately 6.0
MGD for a total average ash removal flow of 16.0 MGD.
'Plant Allen presently has additional air pollution control systems installed on
three units. Use of these systems entails the use of low concentrations of
ammonia and sulfur compounds. These systems aid in the collection of the ash
In the electrostatic precipitators.
A Selective,Non- Catalytic Reduction (SNCR) system has been installed on unit
1 to aid in the reduction of'NOx emissions. SNCR systems operate by injecting
urea into the upper section of the boiler where a chemical ,reactlon occurs to
reduce the- NOx to water and nitrogen. Some residual ammonia will be collected
on the fly ash in the electrostatic precipitators and a small .amount will be carried
to,the ash basin. iHowever; the operation of the SNCR `system is not expected to
require additional treatment capabilities to ensure compliance with NPDES
permit limits. Additional SNCR systems are to be, installed on the remaining,4
units at Allen over the next several years.
2.2.5 Recirculating Water System (RCW)
Plant Allen has 2 RCW systems: a chiller system and a pump cooling water
system. Both systems use the biocide H -550 or similar products. In addition, the
corrosion .inhibitor CS or similar product is used. Generally, these systems are
closed loop, but may need to be drained occasionally. All such water would
enter the floor drains and then be discharged to the ash basin.

Plant Allen, Gaston,County
NPDES Permit No ,NC0004979
Page 6 of 26
2.2.6 Miscellaneous Waste Streams
2.2.6.1 Turbine Non - destructive Testing
Approximately once per year, one turbine is tested for cracks in the
generator shaft using an ultrasonic nondestructive test. 'During tha
process a maximum of 400 gal of demineralized water mixed with 4 gal of
corrosion inhibitor is used and discharged to the ash basin.
2.2.6.2 Heat Exchanger Cleaning
'From time to time,, it may be� necessary to clean the small heat
exchangers with pclyacrylamide, polyacrylate, sodium lau ylsulfate and tri
sodium phosphate. All wastes•would be routed to the ash basin.
2.2.6.3 Condensate Polishers:
Plant Allen utilizes condensate polishers which divert a portion of the
normal condensate (closed system) flow through, one of two cells- per unit.
The, polishers provide, filtration as well as ion exchange functions to
remove or substantially reduce dissolved solids and suspended matter'
present in the condensate stream. The polishers require precoating with
a combination of anion and cation resin. To facilitate precoating, 125 -150
ml of a solution of polyacrylic acid (25 %) is added to the precoat slurry.
Upon exhaustion, the precoat is removed from the filters by water / air
blasting and' flushed, to the ash basin via sump_ s. 'Condensate water is
used to remove the exhausted precoat at the rate of:
Unit 1 & 2 - 1558 gal /precoat
Units 3, 4, & 5 - 2090 gal / precoat:
A total average waste flow of approximately 980 GPD to the ash basin is
realized.
2.2.6.4 Condenser Leakage Testing:
Fluorescing Dye Method - Approximately 1 lb. of a disodium fluorescing
dye added to 280,000 gals of demineralized water is used occasionally to
test the condensers for leakage. All wastes from the testing would be
routed to the ash basin.,
Sulfur Hexafluoride Method - Periodically, sulfur hexafluoride is injected
into the condenser tubes to locate condenser tube leaks. Sulfur
hexafluoride is, a chemically inert, nonflammable, nontoxic gas with an
extremely low water solubility. It is estimated that 150 grams of sulfur
hexafluoride would be used during the leak detection ,process. Most of the
sulfur hexafluoride would be volatilized during the process.

Plant Allen, Gaston County
NPDES Permit No NC0004979
Page 7 of'261
2.2.7 Ash Basin'Treatment
CO2 Injection System - During warmer periods of the year, algae blooms occur'in
the ash basin causing pH levels to rise. A CO2 system is utilized during these
events to maintain the pH level below 9.0 standard units.
Acid Injection System - An acid'injection system utilizing 78 -80 % sulfuric acid is
maintained as back -up to the CO2 system for pH adjustment
Sodium Hydroxide System - A sodium hydroxide Injection system utilizing 25% or
50% sodium hydroxide is maintained for pH adjustment.
2.2.8 Yard Drain Sump
The yard drain sump is a large concrete structure that has three level controlled
pumps, which pump`wastewater from Plant Allen to the ash basin. These pumps
are operated on a rotating basis. The, combined average flow from all sources tied
to the yard drain sump is approximately 4.0 MGD'. (See Section 3:4 for a more
detail description of rainfall run -off enterl'ng the yard drain sump.) Below is a
description of waste streams going to the yard drain sump:
2.2.8.1 Boiler Room Sumps (Units 1-4)
The water, which flows to the boiler room sumps originates from such
sources as floor wash water, boiler blowdown, water treatment waste,
condensates,, equipment cooling water, sealing water and miscellaneous
leakage (refer to the attached schematic of'water flow for individual flows).
The effluent from the units 1 through 4 boiler room sumps is flushed to the
yard drain sump. The effluent from the unit 5 boiler room sump Is flushed
to the power house sump, which is then flushed to the,yard drain sump.
2.2.8.2 Turbine,Room Sumps
The turbine room sumps accommodate f16Ws from floor washing, leakage,
and occasional condenser water box drainage. Effluent from units 1
through 5 turbine room sumps is flushed to the yard drain sump.
2.2.9 Water Treatment System
The water treatment wastes consist of sedimentation, filter backwash, reverse
osmosis (RO) concentrate, demineralizer,regeneration wastes, and .boiler blowdown.
The make -up water treatment system is compromised ,of a clarifier; two pressure
filters, two activated carbon filters, two garnet filters, a reverse osmosis machine and
one set of demineralizers. Make -up water is used in the boilers and closed cooling
systems.
Clarifier:
The clarifier has an, average production of 0.252 MGD. Alum and caustic or,
ferric sulfate /ferric chloride are used to affect precipitation and thus, remove
suspended solids from the raw river water. Desludging of the clarifier takes

Plant Allen, Gaston County
NPDES Permit No NC0004979
Page 8 of 26
place approximately 8% of the'unit run -time with an average volume of 2300
GPD going to the ash basin
Pressure Filters:
There are two pressure filters which follow the clarifier in the water treatment
process. These filters are backwashed once per week with a waste flow of
11,000 gallons peT backwash. Each pressure vessel will contain 84 0 of
anthracite, 50 0 of quartz, 25 0 of garnet and 41 ft3, of garnet/quartz-support
media. Each vessel will use product water to backwash at a rate of 750 gpm.
On average, both vessels will backwash ,once per week. The contents of',the
pressure filters will be changed out, as Internal maintenance requires, and the
used filter medium will be disposed of in the ash basin.
Activated Carbon Filters:
In addition to the pressure filters, there are two activated carbon filters. These
filters are backwashed twice per month. Approximately 30',000 gallons of water
are required to backwash each of these filters. The activated carbonfilters are
composed of approximately 250 ft3 of granular activated carbon (coal). The
spent filter medium is changed out yearly and is disposed of in the ash basin.
RO Prefilters:
There are,2 RO prefilter vessels, containing garnet, which are used to filter
suspended solids. 'Both filters are backwashed once per week
With the backwashed material routed to the ash basin. Total waste for both
filters is 4500 gallons perweek.
RO Unit:
,A RO unit is used to decrease the conductivity in the filtered water, thereby
Increasing the efficiency,of the deemineralizers and reducing the amount of,
chemical needed for demineralizer,regeneration. During operation, the unit has
a continual blowdown of 60 gal /min, which is discharged, to the ,ash basin. The
RO unit is cleaned on a quarterly basis with the waste going to the yard drains
and eventuallythe ash basin. During a cleaning, approximately 30' Ibs of the
cleaner OSMO AD -20 (containing sulfamic acid) along with 5 gallons of biocide,
2 liters of sodium hydroxide, and 0.5 gallons of sodium lauryl sulfate, is used.
Demineralizer,:
The demineralizer consists of two mixed -bed cells. Only one of these cells is
operated at any one time. The cell which is in operation is regenerated
approximately once every 7- 14 days of operation. A regeneration requires 42
gallons of sulfuric, acid (78 -80 %) and 150 gallons of 50% sodium hydroxide. An
average dilute'waste chemical and rinse flow of '20;000 gal is realized. The
,dilute acid and caustic are discharged to the floor drains simultaneously through
the, same header for neutralization purposes. All regeneration wastes are
flushed to the ash basin. The demineralizer resin is changed out approximately

Plant Allen, Gaston County
NPDES Permit No NC0004979
Page 9 of 26
once every 10 years with the spent resin going to the ash basin. Approximately
1 ml of the surfactant Triton CF -54 or similar product is added to the new resin to
improve separation.
Boiler:Blowdown:
Each of,the five, boilers at'Plant Allen 'blowdown at. an average rate of
approximately 500 lbs. of'steam per hour. The blowdown is allowed to flash in a
blowdown tank. Most of the blowdown is vented to the atmosphere with a
minimal amount of condensate discharged to the boiler room sump. The,
average condensate flow to this sump is 0.004 MGD. Hydrazine is maintained at
a concentration of 25 ppb in the condensate system for deoxygenatlon. A
minute, amount of hydrazine ( <10 ppb) may be present in the condensate flow to
the `boiler room sump.
2.2.10 Preheater Washes
Preheaters are backwashed with raw water approximately 2 times' per year to
remove ash and corrosion products. There are 12 preheaters at Allen, that would
require approximately 100,000' gallons of backwash water each. The backwash
water is routed to the ash basin through the yard drain sump.
2.2.11 Laboratory Wastes
The chemistry lab on site performs a variety of water analyses and routine sample
collections. Therefore several chemicals are used in the ,lab in small quantities for
sample preservation, bottle rinsing, equipment calibration, conductivity analyses, _
etc. The wastes are flushed down the sink and'discharged `into,the yard drain sump
and then pumped to the ash basin. Some of the laboratory chemicals are as
follows: Ammonia molybdate, Acetic acid, Ferric sulfate, Hydrochloric acid,
Monoethylamine, Nitric acid and Potassium hydroxide.
2.2.12 Power House Sump (Unit 5)
The wastes, which enter the-floor drains at Plant Allen, accumUlate,in the boiler
room sumps and turbine room sumps. The water which flows to the boiler room
sumps originates from such sources, as floor wash water, boiler blowdown, water
treatment waste, condensates, equipment cooling water, sealing water and
miscellaneous leakage. Effluent from the unit 5 boiler room sump is flushed to the
,powerhouse sump, which is then flushed to the yard drain sump. This sump also
collects stormwater from various drains located on the north end of the powerhouse.
(See Section 3.4 for a more detail description of rainfall run -off entering the
powerhouse sump.)
2.2.13 Physical Chemical Treatment System
An Authorization to Construct permit number NC0004979A01 was' issued to Allen
Stearn Station on June 21, 2004 for a physical chemical treatment, system that will
allow construction of:

Plant Allen, Gaston County
NPDES Permit No NC0004979
Page 10 of 26
• three primary settling cells,
• a treatment channel,
• a chemical injection system, and
• a final settling /focculation cell.
The purpose of this system is to provide a° chemical injection system for'treatment of
dissolved pollutants that will not settle out of the�wastestream through purely
physical means. The system will treat 1&24 MGD sluice water to reduce the TSS
and selenium to below permit limits. The three primary settling cells will be used to
settle the solids (one at a time, while the inactive cells are being cleaned).
The treatment channel will' convey settled sluice water to the secondary settling or
fl'occulaiio_n cell., Approximately 25 -50 gpm cif the, settled, waste stream from the
treatment channel will be pumped into the chemical treatment'building. This
pumped stream will provide the opportunity to take samples before and after
treatment and serve as the, waste stream's chemical injection point. The chemicals
that are presently permitted for,treatment in this system are: sulfuric acid, ferric
sulfate and ferric chloride.
After chemical addition and mixing in the treatment channel, the treated waste
stream will be discharged into a floc setting basin to allow sufficient settling time for
any precipitated compounds'to settle prior to discharge. Overflow from the final
settling cell will flow through a vegetated ash delta prior to discharge to the main
pond. There will be an alternative route to discharge from the vegitated ash delta
directly to the final discharge tower.
2.2.14 Wastewater from Future Plant Additions,
2.2.14.1 Selective Non - Catalytic Reduction (SNCR)
As part of the compliance with the North Carolina Clean Air Initiative
(NCCAIR), Allen will install an `urea based "trim" Selective Non - Catalytic
'Reduction (SNCR) systems on all five units. The'installation has been
completed for Unit 1. The trim SNCR systems are expected to reduce
NOx emissions by approximately 3O %. SNCR systems operate by
injecting urea into the upper section of the boiler where a chemical
reaction occurs to reduce the, NOx to water and nitrogen. Some residual
ammonia will be collected on the =fly ash in the electrostatic,precipitators
and a small ,amount will be carried to the ash basin. However, the
operation of the SNCR system is n'ot.expected to require additional
treatment capabilities to ensure compliance with NPDES permit Limits.
Two pressure filters with polymer injection will be installed to,provide
make up water to the SNCR system. Each pressure filter will be
backwashed once per week with :a waste flow of'5000 gallons per

Plant�Allen, Gaston County
NPDES Permit No NC0004979
Page 11 of 26
'backwash. Each pressure filter will contain anthracite, quartz, garnet and
garnet/quartz support media.
2.2.14.2 Flue Gas Desulfurization (FGD)
The installation of'a Wet Flue Gas Desulfurization (FGD) system is to be
installed at Allen in the future for the reduction of SO2 from the stack gas.
The following provides a description of the FGD system at Allen.
In a Wet Scrubber system, the SO2 component of °the flue gas produced
from the coal combustion process is removed by reaction with Ilmestorie-
water slurry: The particular system to be used ,at Allen will ,collect the flue
gas after it passes through the electrostatic precipitator and route the gas
into the absorber tank. As the gas rises through the tank'to the outlet at
the top, the gas passes through a spray header. An atomized slurry of
water and limestone droplets is continually sprayed through this header
Into the stream of flue gas. The SO2 in the flue gas reacts with the
calcium in the limestone and produces SO3. The SO3 slurry falls to the
bottom of the tank where a stream of air is injected to oxidize the slurry to
form gypsum (CaSO4•H2O). The gypsum slurry is drawn off the absorber
tank and subsequently to a vacuum belt,filter. Part of the process water
from the FGD system is blown down in order10 maintain the FGD water
chemistry within the FGD system specifications. This water will be treated
in a wastewater treatment system that will discharge to the ash basin.
The FGD system will require a material handling system that will supply
limestone to the scrubber and a gypsum storage area for the gypsum
removed from the process. The limestone will come into the site by rail. It
is,then transferred ,to the FGD site,via,a covered conveyor. Runoff from
the storage area is routed to the ash basin. The gypsum is routed from
the FGD tank via,a covered conveyor belt that will carry It to a storage
pile. The runoff from this area is also routed to the ash basin.
2'.3 Outfall 002A — Coal Yard Sump Overflow
An overflow pipe that directs flow from the sump to the Catawba River was included in
the construction of the coal yard sump. Thi's was done to prevent submergence and
damage of the pump motors within the sumps in the event that.all pumps failed or
redundant power supply lines could not be restored in a timely manner. Overflow, has
not occurred during'the last permit cycle.
2.4 Outfall 002B — Powerhouse Sump Overflow
An overflow, pipe'that directs flow from the sump to the ground was included' in'the
construction of the, powerhouse sump. This was done to prevent submergence and
damage of the pump motors within the sumps, in the event that all pumps failed or
redundant powersupply lines could not be restored in a timely manner. If enough water

`Plant Allen, Gaston County
NPDES Permit No NC0004979
Page 12 of -26
overflows, the waste water could potentially get to the Catawba River-. Overflow has not
occurred during the last "permit cycle.
2.5 Outfall 003 — Misc Equipment Cooling & Seal Water
Outfall 003 discharges into the CCW discharge canal., The discharge consists of
cooling water from units 4 and 5 boiler.feedpump hydraulic coupling coolers and other
miscellaneous equipment cooling. This water is once- through, non - contact cooling
water withdrawn from the service water system.
Approximately 10,000 gpd of bearing cooling water for the ash line booster pump is
routed back to the discharge canal via outfall in the vicinity of outfall 003.
The water is once through, non - contact cooling water withdrawn from the service water
system.
2.6 Outfall 004 — Equip. Cooling & Intake Screen Backwash
2.6.1 Equipment Cooling Water
Cooling water for units 1,2 & 3 boiler feed pump hydraulic coupling coolers and
other miscellaneous equipment is discharged through outfall 004. This water is
once - through, non- contact'water drawn from the servicewater system. In
addition, water from a vehicle Arise -down area is directed to this outfall. The
rinse water contains ,no soaps or other additives. Allen is also adding a new
chiller system for comfort cooling that will be a once through non contact cooling
water system and will discharge back to the river via outfall 004.
2.6.2 Intake Screen Backwash
The intake screens at PI'ant Allen are flushed on an "as needed "' basis.
Backwash usually averages 2, hours per shift. The average volume required is
0.053 MGD. The large debris floating on the river�is caught,on the parallel bar
screens. This trash is collected and disposed of in a landfill. The silt, twigs,
leaves and other light debris collected on the rotating screens are indigenous to
the river and are therefore flushed back with no harmful environmental
consequences.
3.0 STORMWATER GENERAL INFORMATION
3.1 Site Description
Allen Steam Station property covers approximately 953 ,acres. The- powerhouse,
the plant yard, the coal pile, the switchyards, and associated material and
equipment storage areas cover about 65 acres. These developed areas are
generally flat. There are approximately 5 miles of rail access and 1 2/3 miles of
paved roadways on -site. Coal Is shipped to the site by rail lines. There is a 64
acre retired ash basin. The active ash basin has a surface area of about 176
acres, and it receives runoff from another 112 acres.

Plant,Allen,,Gaston County
N_PDES,Permit No NC0004979
Page 13,of 26
Based' on information from the Soil Survey of Gaston County, North Carolina, the
original site soils at Allen Steam Station' were from the Gaston series. These
soils are classified as sandy clay loam with red clay in the subsoils. In developed
areas, the soil profile has been altered by grading and filling. The site
topography is generally flat with 'rolling hills in outlying, undeveloped areas.
3.2 Storm Water Drainage System
In developed areas, runoff flows overland to ditches and catch basins,, which are
connected to a buried network of corrugated metal pipes (CMP). Rainfall runoff
from, the coal pile and coal handling areas and portions of the plant yard goes to
the yard sumps that discharge to the ash basin. Storm water runoff from other
areas of the site is discharged to the Catawba ,River and the South Fork River.
Rainfall runoff from the transformer'yard area and the 115 KV switchyard is
routed through oil trap tanks, prior to being discharged.
3.3 Characterization of Drainage Basins
A description of the drainage area, ,significant, materials, and material control
measures is-presented for each drainage basin. Herbicides are spot applied
where required in parking areas, switchyards, parts laydown areas, along
walkways, and around various fixtures and ,buildings.
3.4 Storm Water Outfalls
Characteristics for 14 individual outfalls and one group of outfalls a"re presented.
�ischarge Storm Water Outfall 1
Structure: 10 inch ( ") diameter (�) CMP
Location: North of station on railroad tracks
Drainage Area: 1.75',acres,'
Area Description
This outfall conveys runoff from an undeveloped, wooded area upland of the
railroad tracks and from the tracks themselves. About, 200 feet of an unpaved
road passes through the drainage area, and there are about 1600 feet of railway
lines. There are no paved or roofed areas 'in this,drainage area.
Significant Materials' [ Controls
Significant materials are not stored within this drainage basin.
• Storm Water Outfall 2
Discharge Structure: '24" � CMP
Location: North, of station on railroad tracks
Drainage Area: 1 0,.6 acres.

Plant Allen, Gaston County
NPDES Permit,No NC0004979
Page 14 of 26
Area Description
This outfall conveys runoff from an undeveloped, wooded area upland of the
railroad tracksrand from the tracks themselves. About 600 feet of an unpaved
road passes through the drainage area, and there are about 900 feet of railway
lines. There ,are no paved or roofed areas in this drainage area.
Significant Materials / Controls
Significant materials are not stored within this drainage basin.
Storm Water Outfall 3
Discharge Structure: 8" � CMP
Location: North of station on railroad tracks
Drainage Area: 1..4 acres
Area Description
This outfall conveys runoff from an undeveloped, wooded area upland of the
railroad'tracks and from the tracks themselves. About 50 feet of "an unpaved
road passes through the drainage area, and there are.about 1500 feet of railway
lines. There are no paved or roofed areas in this drainage area,
Significant Materials / Controls
Sionificant materials are not stored within this drainage basin.
;ischarge Storm Water, Out-fall 4
Structure: 10" � Cast Iron Pipe
Location: North of,station at Catawba River
Drainage Area: 1.4 acres
Area Description
This area is an extremely flat area covered, with gravel that is used as a material
laydown area. None of the drainage area is paved or roofed.
Significant Materials / Controls
Laydown Area:
Spare equipment, parts, steel,
are stored in a large, flat
powerhouse. The e_ quipment
liquids.
iron, cable, and miscellaneous supplies
gravel laydown area north of the
and supplies generally do not contain
;ischarge Storm Water Outfall 5
Structure: 18" CMP
Location: North of station at Catawba River
Drainage Area: 7.4 acres

Plant Allen, Gaston County
NPDES Permit No NC0004979
Page 15 of 26
Area Description
This �outfall conveys runoff from an undeveloped, wooded' area upland of the
railroad tracks and from the tracks themselves. About 450 feet of a paved road
passes through the drainage area, and there are about 2,580 feet of railway
lines. About 2 percent of this drainage area is paved.
Significant Materials / Controls
Significant materials are not stored - within this drainage basin.
;ischarge,Structure: Storm Water Outfall 6
10" 0 Cast Iron Pipe
Location: North of station at Catawba River
Drainage Area: 1.7 acres
Area Description
This area is an extremely flat area covered with gravel that is used as a material
laydown area. None of the drainage area, is paved or roofed.
Significant Materials / Controls
Laydown Area:
Spare equipment, parts, steel, iron, cable, and miscellaneous supplies are
stored in large, flat, gravel laydown area north of the powerhouse. The
equipment and supplies generally do not contain liquids.
• Storm Water Outfall 7
'Discharge'Structure: 18" 0 CMP
Location: North of Station at Catawba River
Drainage Area: 5.5 acres
Area Description
This outfall conveys runoff from an undeveloped, wooded area upland of 'the
railroad tracks, from the tracks themselves, and from a laydown yard. About 400
feet of a paved road passes through the•drainage area, and there are, about
•2,280 feet of'rail lines. The laydown yard is extremely flat and covered in gravel.
About 2.5 percent of this drainage area is paved.
Significant Materials / Controls_
Laydown Area:
Spare equipment, parts, steel, iron, cable, and miscellaneous supplies are
stored in a large, 'flat, gravel laydown area north of the, powerhouse. The
equipment and supplies generally do not contain, liquids.

Plant Allen, Gaston County
NPDES Permit No NC0004979
Page 16 oQ6
Storm Water Outfall 8
Discharge Structure- 24" � CMP
Location: North of Station at Catawba River
Drainage Area: 5:0 acres
Area Description
This outfall conveys runoff from the hill North of the powerhouse including
undeveloped wooded areas, from, the gravel parking areas at the outage trailer
area, and the grassed areas around the fuel oil tank. This outfall a`Iso conveys
runoff_ from a, segment of railroad `tracks and from the laydown area adjacent to
the north Warehouse. There ,are approximately 1,000 feet of paved roadways
and 2°,400 of railroad tracks in this drainage basin. About 2 percent of this
drainage area is paved or roofed. The fuel oil. tank `is not located within this
basin because it is surrounded by an earthen berm, and drainage from inside the
berm is routed to the powerhouse yard sumps
Significant Materials / Controls
Parking:
There is a gravel parking area at the outage'trailers. This lot is used
occasionally during outages.
Laydown Area:
Spare equipment, parts, steel, iron, cable, and miscellaneous supplies are
stored in a large flat, gravel laydown area adjacent to the north field
warehouse. The equipment and supplies generally do not contain liquids.
• Storm Water Outfall 9
Discharge Structure: 3' Concrete Ditch
Location: North of Intake Structure at Ca_ tawba River
Drainage Area: 0.5 acres
Area Description
This outfall conveys drainage from •a segment of railroad tracks in front of the
powerhouse and from the grassy embankment, between the tracks and the
intake structure. About 920 feet of railroad tracks pass through this area. There
are no paved or roofed areas in this basin.
Significant Materials / Controls
Significant materials are not stored within this drainage basin.
;ischarge Storm Water Outfall 10 Structure: 24" � CMP
Location: South of Intake Structure at Catawba River
Drainage Area: 0.9 acres

Plant Allen, Gaston County
NPDES Permit No NC0004979
,Page 17 of 26
Area Description
This oLitfall conveys runoff from a segment of the railroad tracks, in front of the
powerhouse and from the grassy embankment between the tracks and the
intake structure. About 1,280 feet of railroad tracks pass through this area'.
There are no paved or roofed areas in this basin. Drainage from the CCW clam
filter pit is,discharged'through this outfall.
'Significant Materials / Controls
Significant materials are not stored within this drainage basin.
Storm Water Outfall 11 / NPDES Outfall 004
,Discharge Structure: 72" � CMP
Location: East of Coal Pile at Catawba 'River
Control Structure: 65,300 gallon oil trap tank
Drainage Area: 14.2 acres
Area Description
This drainage area comprises most of the southern end of ,the station yard, and
most of this area is developed. This outfall conveys roof drainage from a portion
of the powerhouse roof, the' machine shop roof, the service bu'ilding roof, the
warehouse roof, and some of the coal handling buildings. These roofed areas
cover about 1.3 acres. Two, large paved parking lots, cover 3 ,acres. Other
parking and paved areas cover about 1 acre. About 3,100 feet of rail lines pass
through this drainage area, but�only half of them are used regularly. Runoff from
a portion of the transformer yard area and from the entire 115 kV switchyard is
routed to a 65,300 gallon oil trap tank prior to being ,discharged to this outfall.
The switchyard is covered with gravel. Other portions of the drainage area
include the powerhouse yard, grassy, and undeveloped areas. About 50 percent
of this drainage area 'is roofed or paved., NPDES discharges including
miscellaneous non - contact cooling water from plant equipment, vehicle wash
water, and intake screen backwash water are conveyed through'this outfall.
Significant Materials / Controls
Coal: Coal dust may be present around coal handling areas.
Kerosene: There is a 200 - gallon aboveground, carbon "steel kerosene tank in
front of the service building.
Parking: There are about 3.2 acres of paved parking areas within this drainage
basin.

Plant Allen, Gaston County
NPDES Permit No NC0004979
Page 18 of 26
Laydown Area:
Spare equipment;, parts, steel, iron, cable, and miscellaneous supplies are
stored in a flat, concrete laydown yard adjacent to the warehouse. The
equipment and supplies generally do not contain liquids.
Gasoline: There is a,500-gallon aboveground, carbon steel gasoline tent 'tank
across from the warehouse. The tank is completely enclosed within a
steel tent enclosure, and any leaks would be self contained. The
enclosure can be drained by opening a valve, and that valve remains
closed at any other time. Any fluid drained from the tent is captured and
not released to SW Outfall 11. The tank is filled by a 1,500 gallon tanker
truck. Clean up supplies are located nearby. Gasoline contaminated
groundwater from recovery wells is sometimes stored ,in a 55- gallon drum
beside the gasoline .tank.
Oil: Runoff from the 1,15 kV switchyard and from a portion of the station's
main transformer yard is routed to the south oil trap tank which has a
capacity of 65,300 gallons. The south oil trap tank discharges storm
water to SW Outfall 11. Transformers 1,A, 1'T1, CT1„ 2T1, 2A, and 3T1
contain a total of 34,533 gallons of mineral oil. The largest volume
contained by q single transformer is 9,715 gallons. The oil circuit
breakers in the 115 kV, switchyard contain a total of 73,229 gallons of
mineral oil. Each circuit breaker has three tanks, and each' tank contains
either 933 or 1,070 gallons of mineral oil, depending on the model. Two
transformers at the switchgear house each contain 196 gallons of mineral
oil.
;ischarge Storm Water Outfall 12 / NPDES 003
Structure: 36" � CMP
Location: Discharge ,Canal
Control Structure: 100,000 gallon oil trap tank
Drainage Area! 11.1
Area Description
This drainage area includes portions of the powerhouse yard north and west of
the station and part ,of -the hill ta the north of the station where the outage trailers
are located. This drainage basin includes a portion of the station main
transformer yard and the 230 kV switchyard. Within the powerhouse yard, the
drainage basin Is flat and generally covered with ,gravel or grass. About 1,400
feet of rail lines pass through this drainage area, but they are not used regularly.
Less than 5 percent ,of this drainage area is roofed or paved. Runoff from the
powerhouse yard immediately north and, west of the station is routed to a
100,000 gallon oil trap .tank, prior to being discharged to this outfall. Runoff ,from
the transformer yard goes to the oil trap tank. Runoff from the 230 kV switchyard
is not routed to the north oil trap tank because the switchgear in the 230 kV

Plant Allen, Gaston County
NPDES Permit No NC0004979
Page 19;of 26
switchyard is gas cooled and does not contain oil. NPDES discharges of
miscellaneous non - contact cooling water are routed through 'the north oil 'trap
tank and then discharged by this outfall.
Significant Materials / Controls
Ash: Ash pipelines run through'this area carrying ,ash from the, plant to the ash,
basins.
Parking: There are gravel parking areas at the outage trailers. These lots are
used occasionally during outages.
Oil- Runoff from a portion of the station's main transformer yard is routed to
the north oil trap tank. The trap tank discharges storm water to SW,
Outfall 12. Transformers 3T2, 3A, 4T1, 4A, 4T2, 5T1, 5T2, 5A, CT2, and
6A contain a total of 73,158 gallons of mineral oil. The largest volume
contained by ,a single transformer pis 13,790 gallons. The switchgear in
the 230 kV switchyard does not contain oil. The north oil trap tank has a
capacity of 100,000 gallons.
6 Storm Water Outfall Group 13
Discharge Structure: Fourteen 10" 1$, CMP's
Location: Every 200 feet along the railroad tracks west of retired ash
basin
Dra-inage, Area: 10:2 acres
,Area Description
These outfalls are located every 200''feet along the railroad tracks in front of the
retired ash basin. These outfalls convey runoff from the railroad tracks and from
the ash basin embankment. About 7,500 feet of railroad tracks pass through this,
drainage area. None of this drainage ,area is paved or roofed.
Significant Materials / Controls
Significant materials are not stored within this drainage basin.
;ischargeStrubture: Storm Water Outfall 14
21" � CMP
'Location: Catawba River between the coal pile and retired, ash basin
Drainage Area- 6.0 acres
Area Description
This outfall conveys surface drainage from the area between the embankment at
the retired ash basin and the coal pile. None of the drainage area is paved or
roofed.

Plant Allen, Gaston County
NPDES Permit No NC0004979
Page 20 of>26
Significant Materials / Controls
Significant materials are not stored within this drainage basin.
;ischarge Storm Water Outfall 15
Structure: 36" � Reinforced Concrete Pipe
Location: .Catawba River at retired ash basin
Drainage Area: 65 acres
Area Description
This is the discharge .structure from the retired ash basin. This outfall conveys
only surface drainage from the retired ash ,basin. None of this drainage area is
paved or roofed.
Significant'Materials, /'Controls
Significant materials are not stored' within this drainage basin.
2.2 Sump System
At Allen Steam Station, there are three yard sumps: the powerhouse yard sump,
the yard drainage sump, and the coal yard sump. The powerhouse yard sump is
located east of the powerhouse, at the north end. The powerhouse yard sump
discharges to, the yard drainage sump. The yard drainage sump is located east
of the coal pile and adjacent to the coal yard sump. The yard drainage sump
and coal yard sump discharge to the ash basin.
�ocation: Powerhouse Yard Sump
East of the powerhouse, at the north end
Drainage Area: 4.0 acres
Area Destrigtion
Industrial wastewater from some of the powerhouse sumps flows to the
powerhouse yard sump. Storm water runoff from a portion of the powerhouse
roof, the plant yard, the fuel oil unloading area,- and the bulk fuel oil tank area
drains to the powerhouse yard sump. The portion of the powerhouse roof that
drains to the powerhouse sump is about 2.2 acres, About 85 percent of this
drainage basin is paved or roofed. Overflow from the powerhouse yard sump
would spill to the ground and then flow overland and could eventually reach the
Catawba River. Overflow from the powerhouse yard sump is permitted as
NPDES Outfall 00213. Overflow from the powerhouse yard sump is not a normal
occurrence.
Significant Materials / Controls,
Oil: The fuel oil bulk storage tank is an aboveground, galvanized steel cylinder
surrounded by an earthen berm sufficient in height to contain a total spill
plus rainfall. The total tank capacity is `100,000 gallons. There, is a catch
basin inside the berm. This outlet has a valve which is normally closed.

•
Plant Allen, Gaston,County
NPDES PePmlt No NC0004979
Page,21 of 26
The storm water is inspected for the presence of'oil, and if`it is clean, it
can be drained if there is significant standing water,.
In the fuel oil unloading area, fuel is,transferred from an 8,,000 gallon
tanker truck to the bulk storage tank via pipelines. DOT unloading
procedures are followed, -The fuel, oil unloading area is paved and
surrounded by a one foot concrete curb and ramps to contain any spills.
There is a small sump to drain 'rainfall;, the }sump- has a valve which is
normally closed: Spill clean -up supplies are located nearby. Piping from
the unloading area to the bulk fuel oil tank is aboveground or enclosed in
a concrete trench.
The 48 transformers for the Units 1 -5 precipitators contain a total of 7,560
gallons of mineral oil. About 3/5' of the precipitator transformers are
located within this drainage area. The maximum oil content of any single
component is 20'5 gallons.
Wastewater: '
,Plant wastewater from equipment discharges, floor drains, sumps, etc.
is routed to the powerhouse yard sump. This wastewater may include,
oil, chemical, and hazardous waste spills.
�ocation: Yard Drainage Sump
East of the coal pile
Drainage Area: 4:0 acres
Area Description
The powerhouse yard sump discharges to the yard drainage sump. The yard
drainage sump discharges to the ash basin. Jn addition to the discharge from
the powerhouse yard sump, the yard drainage sump receives industrial
wastewater from some of the powerhouse sumps. Industrial wastewater
includes effluent from the turbine room sumps and boiler room sumps. Storm
water runoff from ,a portion ,of the plant yard ,and parts of coal handling drains to
the yard drainage sump. The total roofed area in this basin is about 1.5 acres
including the warehouse, roof, the maintenance garage roof, and a portion of the
powerhouse roof. About half of this drainage basin is paved or roofed.
Approximately 1;300 feet of railroad tracks pass "through this drainage area.
Overflow from the yard drainage sump would discharge to the coal yard sump.
Overflow from, the sump is not,a normal occurrence.
Significant Materials / Controls
Oil: Used oil is stored in a 4,500 gallon steel tank. The tank is surrounded by
a steel containment dike about five'feet tall, and the piping, is surrounded
by a 6 -inch concrete curb. Rainfall that accumulates inside the dike can
be drained by opening a valve that drains to the ash trench which leads to

Plant Allen, Gaston County
NPDES Permit No NC0004979
Page 22:of'26
the yard drainage sump. When the used oil tank,is full, the product is
removed from site by tanker truck.
Small' quantities of used oil' are initially,poured into 55- gallons drums. The
drums are stored in the used oil staging area under cover, adjacent to the
Warehouse, for temporary storage. When the drums are 'full, they are
emptied into the used ,oil tank. Empty oil drums are stored outside,
adjacent to the boat shed.
Approximately 250 gallons of oil are, stored inside the maintenance garage
Where °floor drains flow to the yard drainage sump.
The 48 transformers for the Units 'l -5 precipitators contain a total of 7,560,
gallons of mineral oil. About 215 of the precipitator transformers are
located within this drainage area. The maximum oil content of any single
component is 205 ,gallons., Two transformers associated with the
wastewater and coal yard sumps each contain 270 gallons of'mineral oil.
Fuel oil dispensers for the 'locomotives and bulldozers are located
adjacent to the maintenance garage.
Wastewater,: Plant wastewater from equipment discharges, floor drains, sumps,
etc. is routed to the yard drainage sump. This wastewater may include
oil, chemical, and hazardous waste spills.
Coal: Coal dust is present along the railroad tracks and coal handling areas.
Ash: Ash pipelines run through this drainage, area.
Chemicals:
There is a 5,000 gallon tank of sulfuric acid located adjacent to the
warehouse. The tank is surrounded by a concrete dike with an outlet
to the ash line trench which leads to the yard, drainage sump. Drums
of various' chemicals -are stored inside, a covered, locked shed adjacent
to the warehouse.
Hazardous Waste / Satellite Accumulation Areas:
There is a satellite accumulation area for paint, chemicals, solvents,
cleaners, etc. adjacent to the paint warehouse. Hazardous wastes are
stored in a covered area adjacent to the maintenance, garage.
Laydown Area:
`There is a large laydown area adjacent to the warehouse. The area is
paved and fenced. Spare equipment and parts are stored in the
laydown' area.

®. Plant Allen, Gaston County
NPDES Permit No NC0004979
Page 23 of 26
See description for powerhouse yard sump for additional significant materials.
�ocation: Coal Yard Sump
East of the coal pile
Drainage Area: 25.0 acres
Area Description
Storm water runoff from the coal piles and from parts of coal handling drains to
the coal yard sump. Less than one percent of this drainage basin is paved or
roofed. Approximately 800 feet of railroad tracks pass through this drainage
area. Overflow. from the coal yard sump would be conveyed to the Catawba
River. Overflow from 'the coal yard sump is, permitted as NPDES Outfall 2a.
Overflow from the sump is not a normal occurrence.
Significant Materials / Controls
Oil: Two transformers associated with the wastewater and coal yard sumps
each contain 270 gallons of ,mineral oil.
A fuel oil dispenser for the bulldozers is located in the northwest corner
of the smaller coal pile.
Coal:, Runoff from the coal pile and some coal handling areas is, routed to
the coal yard sump.
Wastewater.
Effluent from the septic system goes to coal yard sump.
3.5 Similarity of Storm Water Outfalls at Allen Steam Station
Monitoring all of the storm water outfalls at Allen Steam Station should not be necessary
since many of the outfalls convey storm water from areas of substantially identical
activities and materials Storm water outfalls 8 and 15 are representative for the entire
site.
4.0 Hazardous and Toxic Substances
4.1 Hazardous and Toxic Substances Table 2c- 3
At Plant Allen, the potential for toxic and hazardous substances being
discharged is very low. in reference to Item V -D of Form 2 -C, ,the substances
identified under Table 2c -3 that may be in'the discharge are as follows:
Acetaldehyde, Asbestos, Butyl Acetate, Cyclohexane, 'Diuron, Epichlorohydrin,
Formaldehyde, Monoethyl Amine, Propylene Oxide, Pyrethrins, Vinyl Acetate,
and Xylene.
Other - During the course of the year products such as commercial cleaners and
laboratory reagents may be purchased which contain very low levels of
substance found'in Table 2c -3. It is not anticipated that these products will

e'
Plant,Allen, Gaston County
NPDES Permit No NC0004979
Page 24 of 26
impact the ash basin's capacity to comply with. its toxicity limits, since their
concentrations are extremely low.
4.2 40 CFR 117 and CERCLA Hazardous Substances
The following table 'identifies hazardous substances, located on -site; that may be
released to the sash basin during `a spill in quantities equal ,to or greater than the
reportable quantity (RQ) levels as referenced in 40 CFR 117, 302, and 355. This
list is being provided in order to qualify for the spill reportability exemption
provided under40 CFR 117 and the Comprehensive Environmental Response
Compensation and Liability Act ( CERCLA). These values below represent the
maximum quantities on -site that could be released at one time and sent to the
ash basin. They do not reflect quantities that are discharged through typical use.
Allen Steam Station Hazardous Substances in Excess of RQ
Table 4.2
SUBSTANCE
QUANTITY
SOURCE
Benzene
83 Ibs
Gasoline Tank
Eth (benzene
2,737 Ibs
Diesel Fuel Tanks
Hydrazine
499lbs
Warehouse
Naphthalene
41,,700' Ibs
Fuel' Oil Tanks
Sodium H, di=oxide
1,181 Ibs
Ash basin/Warehouse / #3 Fan, Room
Sodium Nitrite
800 Ibs
Warehouse /Powerhouse
Sulfuric acid
44,277 Ibs
Powerhouse
X lene Mixed Isomers
41,9 Ibs
Gas Tahk
5.0 Allen Steam Station 316 Determination
5.1 Allen Steam Station 316(a) determination
Duke Power Company's 316(a) demonstration (March 1,976) concluded that the
"heated discharge from Plant Allen is such that the protection and propagation of
a balanced indigenous aquatic community in and on Lake Wylie is assured."
Duke's- operation experience during the past five years under the thermal
limitations imposed in, NPDES Permit No. NC0004979 substantiates the above
conclusion and further supports Duke's belief that the operating characteristics of
the station have a minimal effect of the, aquatic environment of Lake Wylie.
Surveys,of the aquatic community in Lake Wylie demonstrate that a Balanced
Indigenous Population exists in Lake Wylie. Accordingly, Duke requests a
31'6(a) variance and further requests that the thermal limitations imposed in the
permit be continued.

f
co
Plant Allen, Gaston County
NPDES Permit No NC0004979
Page 25 of'26
5.2 Allen Steam Station 316(b) Determination
In conjunction with the rulemaking process for the new Phase II 316(b) rule
pertaining to fish impingement and entrainment, historical data and permitting
records were reviewed'. Initial 316'(a) and 31`6(b)' studies associated with
enactment of the Clean Water Act concluded that the location, construction
capacity, and design of the cooling water intake of Allen and other Duke,'Power
steam stations were not detrimental to the aquatic ecosystem and "minimize
adverse environmental impacts. Both North Carolina and EPA regulators
concurred in 1976 that 3'16(b) fish impingement and entrainment studies were no
longer needed at that time. Although the new Phase II 316(b) rule for existing
facilities is currently being litigated, plans 'for information collection (PICs) are
being developed to conduct a Comprehensive Demonstration Study (CDS) to
determine required measures to be implemented per approval of NCDENR.

M'
C-)
Z
\\\ C�' (D
C C�
0 C) (1)
Z
\p CL
CL
U)
CL w
r)
CL
`
z
e
}
4
�f
0
iz
OA
)
\
U)
_
E
.2 U)
L)
E
V)
E
E
2m
Qf
E
(1)
LU
U)
0
0
L)
cu
L
%
f«
E
U)
UT
C
cu
CL
(n
<
t5
E
1E
g
3 E
T
0 (n
m
/
®
m
B
m
<
-T-
og
0
7-
00
M'
C-)
Z

neap //sergei chermkov %40dwq denr'ncmail net @curs ncmail net 11437 -
Subject: permit reviews
From: Shell.Kame- Jo @epamarl.epa.gov
Date: Thu, 28 Sep 2006,08:43 48 -0400
To: �sergei.chermkov @ricmail.net
I have no comments on-
permit mod for NC0003,03 - Cape Fear Steam
permit issuance for NCO038377 - Mayo Electric'
permit issuance for NC0004979 - Allen Steam
Karrie -Jo Robinson - Shell, P.E.
1 of 1 9/28/2006 9 00 AW

l�
u
•
m o0� W A r�Rp�
y ©IA
r NCDENR
p �
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
January 9, 2005
Mr. Michael A. Ruhe
Manager, Environmental Support
Duke Power
EC11E /P.O. Box 1006
Charlotte, North Carolina 28201 -1006
Dear Mr. Ruhe:
Alan W. Klimek, P.E., Director
Division of Water Quality
Subject: Extension of deadline for Submitting
Information to Comply with the Phase 11 316 (b)
Rule
The Division of Water Quality has reviewed your request to extend the deadline for
submitting information required by the Phase II Rule, 40 CFR Part 125 Subpart J until
January 7, 2008 for the following facilities:
1) NC0004979 Allen Steam Station
2) NC0004987 Marshall Steam Station
3) NCO024392 McGuire Nuclear Station
4) NC0004961 Riverbend Steam Stattion
5) NCO024406 Belews Creek Steam Station
6) NC0003468 Dan River Steam Station
7) NC0005088 Cliffside Steam Station
8) NC0004774 Buck Steam Stattion
After considering complexity of the issue and reviewing options allowed by the rule,
the Division grants your request. The Division encourages you to collect all the
necessary information and submit required documentation as expeditiously as
practicable and continue consultation with our staff to achieve compliance with the
requirements of the Phase 11 316 (b) rule.
If you have any questions concerning this issue, please contact Sergei Chernikov at
telephone number (919) 733 -5083, extension 594.
cc. Central Files
NPDES Permit File
EPA, Region IV
N. C. Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699 -1617
Internet: h2o.enr. state. nc.us
Sincerely,
/,,-�an Klimek, P.
Phone: [phone]
fax: [phone]
DENR Customer Service Center: 1 800 623 -7748