NC0003468_Permit Application_20111101 (2)

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October 26,, 2011
Mr. Charles Weaver
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
Surface Water Protection Section, - NPDES
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
CORPORATE EHS SERVICES
Duke Energy
526 South Church St
Charlotte, NC 28202
Mailing Address
EC13K l PO Box 1006
Charlotte, NC 28201 -1006
Subject Duke Energy Carolinas LLC — NPDES Per;_mit Application
Dan River Steam Station - #NCW03468
Dear,Mr Weaver:
Duke Energy requests the subject permit be renewed and reissued The above
referenced permit.expires April 30, 2012. As mandated by North Carolina
Administrative Code 15A NCAC 21-1.0105 (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 renewal application, which includes the
following items:
EPA Form 1
'EPA Form 2C
EPA Form 2E
Site Map
Water Flow Diagram
Supplemental Information
Duke Energy requests notification that this, application is complete
Additionally, the attached report, "Assessment of Balanced and Indigenous
Populations in then Dan River,neariDan River Steam Station," continues to indicate
recovery of aquatic populations and supports renewal of'the ,current thermal
monitoring requirements for outfall #001
Duke Energy requests that the quarterly monitoring requirement for Total Iron at
outfall #001 be removed Comparison, of outfall #001 and intake results
demonstrate no iron contribution from the Condenser Cooling Water System.
www duke- energy com

The following monitoring reductions at outfall #002 are requested based, on
historical monitoring data, which are attached. The suggested methodology
changes are based on the Steam Effluent, Guideline in 40 CFR 423:12.
• Reduction of monitoring of Total Copper quarterly to annually.
• Removal of Total Nitrogen monitoring.
• Removal of Total Phosphorous monitoring'.
Thank you in advance for your, assistance on -this matter. Shouldyou have
questions, regarding this application, please contact me at (704) 382 - 4809.
Sincerely,
Allen Stowe
Water Management
Attachments
cc w/: Mr. Corey'Basinger — NC DENR Winston -Salem R.O.
Ms. Trish MacPherson — NC DENR, Raleigh, N.C. (BIP Report 3 copies)

EPA I D JNUMBERi(copyfromItem PofForm 1)
Please print or type in the unshaded areas 'only NCQ003468
Form Approved
OMB'No 2040 -0086
Approval expires 3 -31 -98
FORM
�+
2C
NP DES
U S ENVIRONMENTAL PROTECTION AGENCY
APPLICATION 'FOR PERMIT TO DISCHARGE WASTEWATER
"% EPA EXISTING MANUFACTURING, COMMERCIAL, MINING AND SILVICULTURE OPERATIONS
Consolidated Permits Program
1 , OUTFALL LOCATION
For each outfall, list the latitude and,longitude' of its location to the nearest,15 seconds and the name of the recevvm_ gEwater _
A OUTFALL NUMBER
(list)
B LATITUDE
C LONGITUDE
D RECEIVING WATER (name),
1 DEG
2 MIN
3 SEC
1 DEG
2 MIN
3 SEC
001
-36
29
7 9
79
43
13.9
Dan River
002
36
29
30 1
79
4'21
39.6
Dan River
003
36
29
18.4
79
43'
32,.2'
Dan River
006
36
29
13 0
79
43
'19.5
Settling Pond to Dan River
007 36 29 6.3 79 43 18 6 Dan River
11 FL'OWS,;SOURCES`OF POLLUTION, AND TREATMENT TECHNOLOGIES
A Attachadme drawing showing the,waterflow through the faality� Indicate`sources)of+mtake water, operations contributing wastewater to themffluent,,and treatment {units
labeled to correspond to the more detailed descriptions,in Item B Construct a water balance,on the line drawing by showing average,flows,betweenjmtakes( operations,
treatment units, and•outfalls If amater balance cannot,be,determined (e g, forcertain mining activities), provide a pictorial description of the nature,and amount of,any
sources of water and any collection,or treatment measures
B For each outfall, provide a description of (1) All operations contributing wastewater to the effluent, including process wastewater, sanitary wastewater, cooling water,
and storm water runoff, (2) The average flow contributed by each operation, and (3) The treatment received by the wastewater- Continue on additional sheets if
necessary
1 OUT-
2 OPERATIONS) CONTRIBUTING FLOW
3 TREATMENT
FALL
NO (hsi)
a OPERATION (list)
b ,AVERAGE;F, „L'OW
(include units)
a ,DESCRIPTION
b 1IST-C9DESdFROM
TABLE12C -1
001
Condenser Cooling Water Includes
169 MGD
Screening- Discharge to surface water -
IT
-
Once Thru Non - Contact- Includes
4A
intake screen backwash
002
AsheBa3ln Discharge
0 4 MGD
Chemical Coagulation, — Settling, Neutralization,
2D
2K
-
Ion Exchange, Discahrge to Surface,Water
1D
2J
4A
00�
. 3
Combustion Turbine Cooling Water
1 3 fMGD 'Variable
'Discharge to Surfaceu Water
4A
(Once'Thru Non - Contact (OTNC))
007
Dredge Equipment Cooling (OTNC)
0 014 MGD Variable
'Discharge to *Surface water
4A
`
004
Settling Pond overflow
_
0 t9GD
084
Settling
iv
Discharge to surface`water
4A
-
008
Intake De -Icing
57, 6 MGD Variable
Discharge to Surface water
qA
005
Unit 1 &3 Equipment Cooling
0 4 MGD
Discharge to surface water
9A
(ONTC)
009
cT Compressor Cooling (OTNC)
0 02 MGD Variable `Discharge
for Surface,Water
--
9A
006
Unit 3 Equipment Cooling
0 6 MGD, `Discharge
to Surface Water
4A
-
(OTNC)
002A
Sumo�overflow'Discharge (OTNC)
Variable
See Supplemental Information
�qA
OFFICIAL USE ONLY (efflueni,guidelinessub- categories)
EPA Form 3510 -2C (8 -90) PAGE 1 of4 i CONTINUE ON REVERSE

CONTINUFD FROM THE FRONT
C Except for storm runoff, leaks, or'spills, are any of the discharges described in Items 11 -A or B intermittent or seasonal?
© YES (complete,the following table) ❑ NO (go`to Section III)
3 FREQUENCY
4 FLOW
a DAYS'PER
B TOTAL VOLUME
2 OPERATION(s)
WEEK
b,MONTHS
2,FLOWRATE'(mmgd)
(specywithunits)
1 OUTFALG
CONTRIBUTING FLOW
;(speck
PER YEAR'
1 LONGTERM
2 MAXIMUM
1 LONGTERM
2 MAXIMUM
C DURATION
NUMBER (list)
`(list)
average)
(specify average)
AVERAGE
DAILY
AVERAGE
DAILY
(in" "days)
See Supplemental Information
III PRODUCTION
A Does an effluent guideline IIm¢abon promulgated by EPA under Section
304 of the
Clean Water
Act apply to your
facility?
YES (complete lternlll -B)
❑
NO (go to Section
1P)
B Are the limitations In the applicable effluent guideline expressed In terms of production (or othermessure'of operahon)7
❑ YES (complete Item III =C) m NO (go to Section IP)
C_ ,If,you answered "yes" to4tem III -B, lafthe quantity which represents an actual,measurement,of your level of production,, expressed in the terms and unds,use'd In the
applicable effluent'guidelme, and mdicate�the affected3ouffalls
1' AVERAGE DAILY PRODUCTION
2 AFFECTED OUTFALLS
(list outfall numbers)
a QUANTITY PER DAY
b UNITS`OF MEASURE
c OPERATION, PRODUCT, MATERIAL, ETC
(specify)
NA
i
NA
NA
NA
IV- IMPROVEMENTS
A.'Are you now required by any,Federal, State or local authority to meet any Implementation schedule for the construction, upgrading or operations ofrwastew'atJr`
treatment equipment or =practiceshor any other environmental programs which may affect the discharges described in this application? Thig,includes. but Is not limited to,
permit conditions „admmistratwe or enforcement orders, enforcement compliance schedule letters, stipulations, court orders, and'grant or loan conditions
❑ YES (complete the following table) © N0'& to Item IV -B)
1 IDENTIFICATION OF CONDITION,
2 AFFECTED OUTFALLS
3 BRIEF DESCRIPTION OF PROJECT
4 FINAL COMPLIANCE DATE
AGREEMENT, ETC
a NO
b SOURCE OF DISCHARGE
a REQUIRED
b PROJECTED
NA NA NA NA NA ANA
,B OPTIONAL You may attach additional sheets, describing any additional, water pollution control programs (or other,eriwronmental projects which may affect your
,discharges) you now have, underway or which you plan 'Indicate whethereach program is now,underway or planned, and indicate your actual or,,planned'schedules for
tconst_ruction
❑iMARKOT IF DESCRIPTION sOF ADDITIONAL CONTROL- PROGRAMS' IS ATTACHED
EPA Form 3510 -2C (8 -90) PAGE,2,of 4 CONTINUE ON PAGE 3

EPA I D NUMBER (copyfrom Item I of Form 1)
CONTINUED FROM PAGE 2 NC00034 "68
V INTAKE _AND,EFFLU ENT CHARACTERISTICS
A, B. &�C See instructions before proceeding —Complete one set of tables for, each outfall — Annotate the outfall number in the space, provided -
_ NOTE ,Tables'V - -A, V-Band V -C are included oNSeparate sheets numbered V -1 thro ugh%V -9
D Use the space below to list any of the pollutants listed in Table 2c4of the, instructions, which you know or have reason to believe is discharged or may be discharged
from any outfall For every pollutant you list, briefly describe the reasons you believe it to be present and report any analytical data in your possession
1 POLLUTANT
2 SOURCE
1 POLLUTANT
2 SOURCE
Asbestos
Cleanup of containment areas
Hof asbestos stripping /handling
,operations Trace amounts may
be dis&harged to the ash
basin
Hazardous and Toxic Substances
See Supplemental Information
VI POTENTIAL DISCHARGES`NOT COVERED
BY'ANALYSIS,
Is any pollutant listed in Item V -C a substance
or a component of�a substance which you
currently use or manufacture as an intermediate
of final product or byproduct?
❑ YES (list all such pollutants
below)
NO (go, to Item VI - -B)
NA
EPA Form 3510 -2C (8 -90) PAGE 3 of 4 CONTINUE ON REVERSE

CONTINUED FROM T,HE +FRONT
VII BIOLOGICAL TOXICITY TESTING DATA
Do you have any,knowledge or reason to believe that any biological,test for acute or chronic toxicify has-been made on any of your discharges or on a recemng water in
relation to,your discharge,withm the last`3 years?
© YES (identify the test(s) and describe their purposes below) ❑ NO,(go to Section,MIM
Quarterly chronic toxicity analysis of Ceriodaphnia per current requirdments' on Outfall 002
I
VIII CONTRACT ANALYSIS INFORMATION
Were any of the analyses reported in Item V performed by a contract laboratory or consulting firm?
YESTisi the name, address, and telephone number of and pollutants analysed by„ El NO (go to Section lk)
each such laboratory orfirm below)
A NAME
B ADDRESS
C TELEPHONE
D,P.OLLOTANTS ANALYZED
(area code & no)
(hst)
Prism Laboratories
449 ppringbrook Road
(800)f529 -6364
MBAS,Color,Sulfite,Fecal
NC' Cert #402
P O Box 240543
Coliform
Charlotte, NC 28224 -0543
Shealy Environmental
106 Vantage Pointe Drive
(803)791 -9700
Ammonia, BOD, COD,
Services,Inc
West Columbia, SC 29172
Nitrate /Nitrites,Cynaide,
NC Cert #329
Phenols,0 &G,TKN,TOC,
_
Bromide,,Chloride,Sulfate,
Sulfide, Phosphorous; Metals -,
0rgan1cs,PCBs
,SGS Laboratory
5500 Business Drive
(910)350 -1903
Dioxins
'NC Cert #481
Wilmingtom,,NC 28405
P 0 Box 30712
(843)556 -8171
Total Radium, Gross Alpha,
GEL Laboratories
Charleston,SC 29417
Gross Beta
NC Cert #233
2040 Salvage Road
Charleston, SC 29407
IX CERTIFICATION
I certify under, penalty of law that this document
and alt attachments were prepared `under my direchon
or supervision to accordance
with a system designed to assure that
qualified personnel properly gather and evaluate
the information submitted Based on, my inquiry
of the.person or persons who manage,
the system or those Persons
directly responsible for gathering the,tnformabon,
the informahon,submttted is, to the best, of my, knowledge
and belief, true, accurate,
and complete / am aware that there
are significant penalties for submitting false information
„ including the possibility of fineand imprisonment
for knowing +wolatrons
A NAME ' &'OFFICIAL'TITL'E,(rypeorprint)
B PHONE'NO (areacode &no)
Stephen A ,Townsend, Sr. - GM II Regulated Fossil Stations
(704') 64'5 -2735
C` SIGNA
D DATE SIGNED
EPA Form 3510 -2C ( 8-90) PAGE 41of.4

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NOTES
1) LISGS'7 5 Minute Series Topographic Quadrangles' Northeast Eden and Southeasl,Eden (NC) DISCHARGE LOCATION MAP FIGURE
[Source f1p / /ftp nconemap com /outgomg/raste ? /drg/J
NPDES Permit No: NC0003468
2) Properly line Information provided by Duke Energy and Is approximate
° indicates approximate location of home assumed to be supplied by private drinking water well
;[Source Rockingham County,GISAerial,(2o07)]; DUKE',ENERGY CAROLINAS, LLC
-- DAN RIVER STEAM STATION
Drawn By Chad Hearn SCALE ROCKINGHAM COUNTY, NORTH CAROLINA
Project Manager Bill Miller o 0125 025 05
Client Duke Energy _ Mlles
Date 10M1/2011

72 gpm &M
28 gpm
Outfall 008 923 gpm
in
Intermittent
Dan River
River Dan Outfall 004
Overflow own�ww
1.3 MGD
2597 gpm
Service ew
water -.0
Moir Branch
~'`~^ '--~------------------------------------- --------- ----'~�'m~ Dan River
| | }
| || J (
'----' 10. Dan River

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EPA Form 3510 -2E (8 -90) Page 1 of 2
EPA ID Number (copy from Item 1 of Form 1)
Form Approved OMB No 2040 -0086
Please print or typeinthe unshaded areas only INCO003468
Approval expires 5 -31 -92
FORM
2E IS EPA Facilities Which Do Not Discharge Process Wastewater
NPDES
I. RECEIVING'WATEi2S
For this outfall, list'.fhe latitude and longltude,:and name of the receiving water(s)
Outfall
Latitude
Longitude
Receiving Water (name)
Number (list)
Deg
Min
Sec
Deg
Mm
Sec
Dan River
006
36
29
13
79,
43
20
JI. DISCHARGE DATE,(Ifa new,discharger, the date,you expecfto begin discharging)
-
4II.TYPE OF WASTE
A Check the box(es) indicating,the general type(s),,& wastes, discharged
Other Nonprocess
❑ Sanitary Wastes ❑ Restaurant or Cafeteria Wastes 0 Noncontact Cooling Water ❑ Wastewater (Identify)
B If any cooling water additives are used, list them here Briefly, describe their composition if this, information is available
IV. EFFLUENT, CHARACTERISTICS
A. Existing, Sources = Provide measurements for the,parameters listed in,the left -hand column'below, unless waived by the, permitting
authority (see instructions)
,B.,, New Dischargefs=lProvide estimates for the;parametemlisted; in the left hand, column�below, unless waived by the permitting
authonty Instead'of the number of, measurements taken, , provide, the;source °of estimated values (see instructions)
(1)
Maximum
(2)
Average Daily
-(3)
(or)
(4)
Number of
Pollutant or
Daily Value
Value (last year)
Parameter
(include units)
(include units)
Measurements
Source of Estimate
Taken
(if new discharger)
Mass
Concentration
Mass
Concentration
(last year)
Biochemical Oxygen
,Demand (BOD)
<10 lbs /day
<2.0 mg /L
Total SuspendedSolids'(TSS)
30 lbs /day
6' 0 mg /L
,Fecal Coliform pfbeheved present
oi: if sanitary waste is discharged)
Total Residual Chlorine (if
<0 25 lbs /dy,
<0 05 mg /L
chlonne is used)
,Oil and Grease
<25 lbs /day
<5 0 mg /L
*Chemical oxygen demand,(COD)
<50 lbs, /day
<10 mg /,L
f *Total organic carbon (TOC),
12, 5 lbs• /day
2 5 mg /L
Ammonia (as N)
<b,5 lbs /day
<0.10 mg /L
Discharge Flow
Value 0.6 MGD
pH (give range)
Value 7.J7
i
Temperature (tMnter)
°C
°C!
Temperature (Summer)
°C
°C
'If noncontact cooling water is discharged
EPA Form 3510 -2E (8 -90) Page 1 of 2

1 i.
V. Except for leaks ors ills, >will the discharge described imthis form�bwintermittentor seasonal?
❑ Yes No
If yes, briefly describe the frequency of flow and duration
VI. TREATMENT SYSTEM (Describe bnef/y any treatment sysfem(s) used or to be used),
VII. OTHER INFORMATION (Optional)
Use the space below to expand upon any of the above question's or to bring to the attention of the reviewer any other information you feel
should be considered in establishing permit limitations Attach additional sheets, if necessary
VIII. CERTIFICATION
I certify under penalty of law that this document and albattachments were prepared under my direction orsupervisron in accordance with a
system designed, to assure that qualified personnel properly gather and evaluate the information submitted Based on my inquiry of the person or
persons who manage the system, or those persons directly responsible for gathering the,mfonnation, the information submitted is,to the best of
my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including
the possibility of, fine ,and'impnsonment for knowing violations
A Name &.Official Title
B Phone'No (area code
& no)
Stephen A Townsend, Sr. /General Manager II, Regulated Fossil Stations
(704) 645 -2735
,C Signature
D Date'Signed
EPA Form 3510 -2E (5 -90)
Page 2 of 2

10/24/11
NPDES Supplemental [nformation
For
Dan River Steam Station
NPDES Permit # NC0003468

Dan River Steam Station, Rockingham County
NPDES Permit,N_o. NC0003468
Page 2 of 16
General Information
Dan River (DR) Steam Station pumps water from the Dan River for condenser cooling and service
water requirements. The condenser cooling water is once through non - contact. Service water is
pumped to a settling pond to remove sand and silt before entering the station. A brief discussion
of each discharge follows.
The coal fired units (1 -3) are expected to be retired during March — April `2012. The natural gas
combined cycle unit is currently under construction and is expected to be operational around
October 2012.
Discharge 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. Each of the, 3,,DR units has two
condenser cooling pumps. The capacities of,these pumps, are:
Unit 1 1 pump - 37,600 GPM 2 pumps - 56,200 GPM
Unit 2 1 pump -37,600 GPM 2 pumps_ 56,200 GPM
Unit 3 1 pump - 54;000 GPM^ 2 pumps, - 82,000 GPM
The operational schedule for these pumps is dependent on the intake temperature and on the unit
loads. Depending on the electrical demand, pumps are operated to maximize efficiency and to
assure balanced and indigenous populations are,maintained'in the Den River.
Condenser cleaning is accomplished either mechanically by backwashing or by manually forcing
metal scrapers through the tubes under air pressure to remove mud and slime. The condenser
tubes are cleaned in this ,manner approximately once per year.
The intake screens are backwashed with raw water taken from the settling pond. The combined
flow rate from the pumps is 5000 gpm These pumps are operated on an on /off basis for a total
operating time of 6 hours per day. Debris collected on the screens consists mainly of twigs,
leaves,,and other material ;indigenou_srto the river and''is flushed back without adverse
environmental consequences.

Dan River,Steam,Station, Rockmgham,County
NPDES Permit N6.,N&0003468
Page,3 of 16
Discharge 002 = Ash Basin
Storm Water
The DR ash basin accommodates flows from the yard drainage sump, ash removal lines, and
rainfall run -off from the basin watershed area. The average rainfall run -off flows are, based on 44
inches of rain per year,with 100% run -off from the pond surfaces and 506/o ,run -off from other
areas. The average run- off'for'the ash basin watershed area is 0.418 MGD. The coal ,yard
drainage drains to the yard sump and is then pumped to the ash basin. The coal yard has an
average run -off of 0.007 MGD This ,run -off is based on 44 inches, of rain per year with 50% run=
off.
Fuel, Oil Storage Run -Off:
DR has one large fuel oil storage tank (500,000 gallons). The tank is, surrounded by an
earthen dike to contain the contents in-the event of an accidental rupture. Any stormwater
collected in the fuel oil storage tank containment area is verified to be free of oil prior to
being pumped into a drain that discharges into the Dan River. In addition to this
precaution, two 20,000 gallon oil trap tanks have been - installed to collect any spilled oil
before the runoff reaches the river, including runoff from the fuel unloading area Any storm
water runoff and any oil spillage around and inside of the combustion turbine buildings are
routed 'to the.,oil trap tanks, prior to release to the Dan River.
All oil storage facilities are presently covered under the Spill Prevention Control and
Countermeasure Plan.
Floor Drains
The powerhouse floor drains-, connect to sumps where the waste is then pumped to the ash basin.
These drains can receive inputs from spillage orileakage; floor wash water, as well as flows from
water treatment processes. The following are, examples of materials that are stored inside the
powerhouse:
sulfuric acid
ethylene glycol (recycled)
gasoline
oil, lube oil (recycled)
,hydrazine
sodium hydroxide
asbestos
water treatment chemicals
sulfur
ammonium hydroxide
soda ash
industrial cleaning products

Dan River Steam Station, Rockingham County
NPDES Permit No NC0003468
Page 4 of 16
M
!Make -Up Water Process Wastes
The water treatment wastes are made up of sedimentation, filter backwash, demineralizer
regeneration,, wastes and boiler, blowdown. Make -up water is fed to, th&boilers to generate steam
to turn the turb,i'nes. The current primary, make- up'water treatment system is comprised of
activated' carbon filters, a reverse osmosis filter unit and a demineralizer with two cells with water
supplied from the, City of Eden. The back -up make -up water treatment system consists of a
clarifier, pressure filter, activated carbon filters, a reverse osmosis filter�unit and a demineralizer
with two cells with water supplied from the service water system.
Clarifier:
The.clatifier utilizes,a continuous'feed of Nalco'8105 cationic water treatment polymer,
Calgon CA=25 clay and sodium hypochlorite in order to maintain an average of 3 ppm, 30
ppm and 3 ppm, respectively. The solids in the clarifier are desludged continuously to the
floor drains and then pumped to the ash basin
Pressure Filters'
Two pressure filters ,used for removal of colloidal material are .backwashed on an as
needed basis, dependent upon the level of solids in the intake water, but no more than twice
'per week. The.filter medium, which is composed of gravel,, sand, garnet and anthracite
(coal), s replaced approximately once every ten ,years and is sluiced to the ash basin.
Activated Carbon, Filters:
Two activated carbon filters remove organics and the chlorine that is injected in the clarifier.
These filters are backwashed approximately'twice per month to the ash basin.
Approximately 80 ft 3 of activated carbon is replaced as required (typically every'two or,
three years) and 'the, spent carbon is discharged toIhe ash basin

Dan River Steam'StationRockingham "County
NPDES Permit No NG00046&
Page,5 of 16
r ;
Reverse Osmosis (RO) Unit.
The RO unit is used to decrease the dissolved solids in the,make -up water, thereby
increasing4he efficiency of.the,demineralizers and reducing the amount of chemicals
needed - for °demineralizer regeneration. Sulfunc acid is injected continuously at' a, rate of
approximately 4 -- 5 gal /day to control pH. During operation, the unit has a continual
concentrate feject of 50 gal /min, which is discharged to the ash basin. Small amounts ,of
-deterg,ents are used approximately every three months to clean the RO unit per
manufacturers recormmendatio is.
Demineralizers:
Each of the two mixed bed ionic exchange demineralizer cells has a capacity of,90 gpm
each, and one cell is regenerated approximately every, five days. A regeneration demands
20 gallons of 66 Be' sulfuric acid (93 %), 80 gallons of 50 %. sodium hydroxide, and
approximately 11,000 gallons of water., The demineralizer ion exchange resin is replaced
approximately once every 5 to 8 years and the spent resin (1 90 ft 3) is discharged to the
ash basin. The quantities of regeneration chemicals that are specified by the manufacturer
are such `that they are effectively neutralized prior to discharge.
Boiler Blowdown: `
The total average blowdown for units 1, 2, and 3 is 2000 lbs. of steam per hour. The boiler
blowdown is routed to a collection tank Hydrazine is infected into the condensate system
as an oxygen scavenger. Most of the hydrazine is utilized and converted to ammonia and
water°which is used for p'H' control. However, trace amounts of hydrazine (< 10 ppb) may
be found in the boiler blowdown which discharges to the floor drains and is pumped to the
ash basin. Ammonium hydroxide is also used for pH control.

Dan River Steam Station; Rockingham County
NPDES Permit No. NC0003468
' Page 6 of16
s
r
Boiler Cleaning
Boilers #1, #2' and #3 at DR are cleaned on an as needed basis, but no more than once every
three years. Owing to the probable closure of the coal fired units in 2012, it is uri_likely that any
future boiler-chemical' cleanings will be performed. The wastes produced from a boiler cleaning
are sluiced to,the ash basin. The chemicals and approximate amounts for each cleaning follow:
Chemical
*Ammonium Bifluoride
Ammonium Bicarbonate
*Ammonium Hydroxide, 260 Be'
Citric Acid
Copper complexer
*Hydrochloric Acid, 200 Be' (31.5 %)
Sodium Bromate
Sodium Carbonate
Sodium Hydroxide, 25%
Corrosion Inhibitors
Range of Amount used per Unit
1,000 Ibs - 1300 lbs
1000 Ibs
'800 gals - 900 gals
200 Ibs -300 Ibs
1,630 Ibs - 1770 Ibs
3400 gals - 4200 gals
550 Ibs
2200 Ibs - 260'0 Ibs
3400 gals —,4200 gals
(as necessary)
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 of any these chemicals were to occur, in most cases, the spill would
be routed to the ash basin for treatment. These chemicals are being identified to qualify
for the spill reportability exemption provided under 40 ,CFR 117 and CERCLA:
The volume of diluted waste chemicals and mater discharged from'unit 1 or 2 during a cleaning is
approximately 340,000 gallons. The volume of diluted waste chemicals and water drained from
Unit 3 is approximately 275,000 gallons. Prior to the beginning of a boiler chemical cleaning
procedure, additional stoplogs are added to the ash basin discharge structure to stop the
discharge This arrangement assures longer retention time of the chemical wastes for proper
treatment through neutralization, chemical reaction, and precipitation as documented in the Ash
Basin Equivalency Demonstration (October 1976). The discharge is held up a minimum of 96
hours following the first chemical drain and additional pH and metals sampling is ,performed for
three consecutive days once discharge begins.
Sanitary Wastes
DR uses municipal water for its sanitary and potable water needs. The estimated annual average
flow is 0.003 MGD, based on 70 permanent employees. This flow rate will decrease as the
number of employees is reduced. The effluent from the package aeration sewage treatment plant
is discharged to the ash basin for secondary treatment. No chemicals are added to the sanitary
effluent prior to discharge'to the ash .basin.

Dan River Steam Station, Rockingham County
NPDES Permit,No. NCt0003468,
Page 7 of 16
Miscellaneous
Ash Disposal:
Electrostatic precipitators are used` at ,DR for air pollution control. . Fly, ash removed from
the precipitators and bottom ash removed from the boilers is sluiced to the ash basin.
Approximately 1.0 MGD of water are required for the ash removal from the- precipitators. In
,orde -r to maintain adequate retention time in the ash basin, .ash is removed from the primary
cell ton an as needed basis, and the wet-ash sludge is deposited in the dry basin. Cover is,
then placed over the sludge an`d'the area is ,reseeded. Excess water and stormwater from,
the dry basin drain back to the ash basin secondary cell.
Closed Cooling Systems:
Several plant�cooling systems are recirculating systems and therefore, require the addition
of microbiocides -and *corrosion inhibitors to prevent biofouling,and piping corrosion. While
these are closed systems, they are drained on a non - routine basis, as necessary for
maintenance, to the turbine building sump and pumped to the ash basin.
,Lab Wastes
The chemistry lab on site performs a variety of water, analyses and routine sample
collection. Therefore several chemicals are "used in the lab in small quantities` for sample
preservation, bottle rinsing, equipment calibration, analytical chemistry, etc The wastes
are poured down the sink and discharge into the building sump and then pumped to the
ash basin
Heat Exchanger Cleaning,
Heat exchangers are physically cleaned of mud fouling on an as needed basis.
Dredge Material:
Because silt settles constantly in'fron;t of the plant intakes, it is necessary to dredge
routinely to assure, a clear intake. In order'to monitor the discharge of,the return water` from
the dredging activity, all'dredge material (raw water and brown micaceous silty sand) is
pumped to the ash basin. Water quality standards can then be assured through routine
Total Suspended Solids (TSS) sampling of the ash basin DR has 404 approval from the
Corps of ,Engineersfor this activity..

Dan River Steam Station, Rockingham County
NPDES Permit No. NC0003468
Page 8 of 16
, U
Turbine Non - destructive Testing:
Approximately, once every 3 — 4 years, -one turbine ,is tested, for cracks in the generator
shaft using an' ultrasonic nondestructive test. During the process, one, hundred gallons of
demineralized water mixed with 1 gallon of corrosion inhibitor is used and discharged to the
ash basin.
Chemical Additions, to the Ash Basin
Small volumes of aluminium sulfate (alum), ferric sulfate, and miscellaneous polymers are
infrequently added directly to the ash basin to encourage coagulation and flocculation, thus
controlling suspended solids. Sulfuric acid is also used for pH control.
Discharge 003 - Combustion Turbine (CT) Coding Water
DR has 3 oil /natural gas fired combustion turbines which are used to provide electricity during
peak demand. These UpIits use once,through non - contact cooling water for the turbine lube, oil
coolers-at a maximum flow of 900 gpm'(with all 3 units in operation) when the CTs are.,in
operation. The cooling water discharges to the settling pond. Due to the fact that the CTs are
only operated a few days out of the year, normally there is no flow from this discharge. These
units are scheduled to be retired in April 2012.
Discharge 004 Settling Pond Overflow
Water is withdrawn from the Dan River and pumped to the settling pond for use in the plant. The
settling' pond is also fed by area drainage and Moir Branch. Creek and has an overflow discharge
back 'to'the river when pond` levels get too high.
Discharge 005 & 006 - Equipment Cooling Water
Once through non - contact cooling wate`rJs used to cool the following equipment
• Unit 1 & 2 preheaters and fans (005 discharges to the Dan River)
• Unit 3 preheaters and fans (006 discharges to the settling pond).
No chemicals are added to these systems.

Dan.River Steam Station, Rockingham County `
NPDES Permit No. NC9003468,
Page 9�6f 16
� J
Discharge 007 - Dredge Booster Pump Cooling Water
'The. intake of the,plant is dredged twice per year on, average to prevent*the buildup of silt When
this occurs, a booster pump is necessary'to facilitate dredging, The booster pump engine requires
once through non - contact cooling water which has a maximum flow rate of 10 gpm. The booster
pump is adjacent to the river behind the powerhouse and the cooling water is discharged to a
ditch which flows to the river. The dredge `is operated approximately 3 — 4 weeks annually.
Discharge-008 - Intake De=lcing
During extremely cold weather,, ice can build up'in the intake and make withdrawal of water
difficult When this situation occurs, a portion of the warm condenser,cooling flow-is diverted back
to the intake to melt the ice. The maximum flow is 40,000 gpm when used. Because this
discharge is, used' only when the units, are operating, the warm discharge is immediately pulled
back into the plant through the CCW system. The Intake De -Icing System is operated very
infrequently. When Unit #3 is operational; flow from the Unit #3 Lube Oil Cooler is discharged via
this outfall.
Discharge 009 - Combustion Turbine Compressor Cooling-
CT Unit 6C uses an air compressor that requires once through non - contact cooling ,water. The
maximum flow when in operation is 14 gpm and discharges to a storm drain near the unit and
eventually flows to the Dan River. CT Unit 6C is only operated a few days per year Typically
there is cooling water flow even, when the ,CT 'is not in ,operation. This outfall may not, be needed
once the CTs retire.

'a
Dan River Steam Station, Rockingham County
NPDES Permit No. NC0003468
Page 10 -of 16
Hazardous and Toxic, Substances Table 2c 3_:
At, DR Steam Station, 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 ash basin discharge are as follows.
Asbestos, Stryrene, Cyclohexane, Xylene, EDTA; Acetaldehyde, Naphthalene,,Triethanolamine
and also products such as commercial cleaners and laboratory reagents maybe purchased which
contain - very ,low levels of`a substance found in Table 2c -3. It is not anticipated that`these
products will impact the ash basin's capacity to comply with its toxicity limits, since their
concentrations are extremely low.
40 OF 117 and CERCLA Hazardous Substances:
The table below ,identifies hazardous substances located', on -site that, may be released,'to ,the ,ash
basin during a spill in quantities equal to or;greater than ,the reportable quantity (RQ) levels as
referenced in 40 CFR 117, 302 and 3'55. This list is being provided in order to qualify for the spill
reportability exemption provided under 40 CFR 117 and the - Comprehensive Environmental
Response Compensation'and Liability Act (CERCL -A).
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.
CHEMICAL
Dicofol
H,,ydrazine
Sodium Hydroxide
Sulfuric Acid
Xylene
nan River, Stea
AMOUNT SOURCE
Ibs
24 Pesticide storage.
513 powerhouse
9,538 Power house
19,333 Outside above ground tank
308 Outside gasoline tank
Station Balanced Indigenous, Populati
Duke Energy's operating experience during the past five years under the thermal limitations
imposed in NPDES Permit No. #NC0003468 has ensured that the "thermal component of the
,discharge assures, the protection and propagation of shellfish, fish and wildlife in,and,,on,the
receiving body of water."

Dan River Steam Station, Rockingham County `
NPDES Permit No. NC .0003468,
Page 11 of 16
As'h Basin Capacity _
Ash Basin ,Capacity - Dan River Steam Station
plus the maximum 24 -hr dry weatherwaste stream which discharges to the Ash Basin (refer to
Section A 9 - Special, Condition of NPDES Permit NC0003468)
I Estimate Runoff to the Ash Basimfrom� a 10 -yr 24 -hr storm
1301
1 Natural,.Drainage Area.of Ash Basin 170
Statiori;Yard Drainage Area Pumped to Ash Basin =
1471
Total =
- 52
2 Precipitation from 10 -yr 24-hr-storm =
6374
-3 Total,Stormwater Runoff to,Ash Basin =
(Assuming 100% runoff)'
dl Estimated Maximum:24 -hr Dry Weather Waste Stream Discharging to Ash -Basin
1 Maximum recorded Ash =Basin Discharge =
7,100,000
2 Increase maximum daily-disharge by 10 %-for
2
conservatism and convert units to acre -feet =
3 97
III Wet Weather Detention Volume
87.71
- Sum,of Parts I and II =
IV

'Dan,River Steam Station, Rockingham County
NPDES Permit No. NC0003468
Page 12 of,16
Time Period
Actual or Estimated'Coal
Consumption 1000's tons
=% Ash
Estimated Ash
Production 1000's tons
Estimated Ash
Production Ac -ft
(SepMec) 2005
7447
969%
722
602
2006
45594
1036%
4724
3943
2007
47602
11 68%
5560
4641
2008
467 19
1157%
5405
4512
2009
8489
1428%
12.12
1012
2010
2833
1239%
3509
2930
2011
1039
12.00%
1247
10 41
2012
109
9,40% i,
-1 02
0.86
2013
00
000%
000
0100
2014
00
000%
000
000
2015
00
000%
000
0.00
2016
0.0
000%
000
000
2017
0.0
0.00%
0 00
0 00
Total
114 80:
13 49
187, 67
*'Calculation assumes an in -place ash density of 55 Ibs per cubic foot
V Estimated Total Storage Volume Required through 2016
Wet° Weather Detention'Volume =
Estimated Solids to Ash Basin Sept 2005 - Dec 2016 =
Total =
VI' Results
Primary Cell
Secondary Cell
Ash Basin Cleanout 2006 - 2007 (212,620 cyd)
Total
Note Available Storage based on basin survey dated 8/25/2005
Required Storage Volume Through 12/31/2017
87.7
Acre -feet
187 7
Acre -feet
275 4
Acre -feet
109 0
Acre -feet
93 2
Acre -feet
1318
Acre -feet
334 0
Acre -feet
_ 275 4 Acre -feet
Based on these calcuIations,-there is sufficient capacity in the ash basin to provide the
retention'volume specified,in the permit through-the year 2017

Dan River Steam Station, Rockingham County
NPDES,,Permit,,No. NC400468
Page 13 of i&
_ w
Dan River Combined Cycle Supplemental Information
This attachment ,is a `brief description ,of the associated water treatment ;systems at the, combined
cycle portion of the Dan River site. This area is currently under construction at the. time of this
renewal application. The combined cycle plant will consist of two General Electric 7FA gas turbine
generators with a General Electric D11 Steam Turbine The nominal output for this facility is rated
for,620 MW The combined cycle plant is being constructed independent of the existing coal
plant, however some auxilliary systems (water intake and NPDES Outfalls) are shared between,
the two plants.
Exact details of :all of the chemicals to be used are not available at this time. Chemical categories,
in lieu of specific chemicals, are listed as reference. Full commercial operations for this;portion of
the Dan River site are scheduled for October 2012. The stat up and associated NPDES
discharges from the Combined Cycle system testing and commissioning operations could begin
as early as April 2012..
This document is a basic overview of the processes, and any,discharges.associated with each
process. Regulatory notifications will be, made to the state for'biocide use 90 days prior to
anticipated discharge.
Storm Water
All stormwater for the combined cycle station is routed through the stormwater drain system to 1
of 2 storm water detention ponds on site: A separate stormwater permit Will be applied for during
commercial operation of the facility. The combined cycle plant is currently covered by the
construction stormwater permit.
Service Water
Influent - Make up water fro_ m the Dan River is routed through three raw water pumps located at
the coal plantto the Graver Clarifier at the combined cycle plant. Sodium hydroxide,is used to
adjust pH. Coagulant (ferric sulfate), polymer and sodium hypochlorife are�also added. Sludge is
removed via sludge pumps and sent through a thickener tank with additional polymer added. The
sludge is then sent to a plate and frame filter press for dewatering and ultimately to an industrial
landfill for disposal.
Water from the clarifier is further treated at the gravity filters and sodium hypochlorite is added -for
disinfectrion The filtered water is stored in the Fire Water /Service Water Tank. This water feeds
the plant fire main and supplies the service water pumps
Boiler Make -Up Water] Condensate
Make up water is fed from the Fire /Service Water Tank (300,000 gallons) or from a connection to
the City of Eden water system and sent through the Reverse Osmosis (RO) system to the
der fineralizer cells. An - anti-,sealant and pH control ireagent'i' added to -th`e make -up boiler feed
water. The auxiliary boiler feed water is treated with ammonia and an oxygen scavenger. Sodium
bisulfite is also injected to remove any residual chlorine ,at the RO inlet.
Citric ,acid & sodium hypochlorite is, used in the Ultra Filtration ,(UF) system, citric acid is utilized in-
the RO system to remove scale and mineral deposits. Antiscalant is added to RO inlet to reduce
scale formation.

Dan River Steam Station, Rockingham County
NPDES PermifNo. NC0003468
Page 14 of 16
Boiler water /condensate is also treated at the Heat Recovery Steam Generators (HRSG's)with the
addition of phosphates (to protect from corrosion and scale forming ions adhering to each other)
and ammonium' hydroxide (for;pH control). It is, possible thatla neutralization tank may be installed
to control pH and residual chlorine prior to discharging wastewater to the waste water sump.
Condenser Cooling Water
Condenser cooling water is supplied through filtered water sent to the ten cell cooling tower. This
water is recirculated and cycled with approximately 5% make up added hourly to account for blow
down and evaporation loss. CCW water is treated with a dispersant corrosion inhibitor, sodium
hypochlorite,and,a,non oxi'dizi'ng biocide.
Cooling tower blow down is treated with sodium bisulfite for residual chlorine removal prior to the
water being sent to the waste water sump. Effluent from the wastewater sump is piped to Outfall
001 through internal outfall 001A.
The CCW pumps circulate 94,000 gpm There are 2 CCW pumps installed on this system
Cooling Tower Blow down rate, Average -'807 gpm.
Chiller Cooling Towers
The four inlet air chillers wile have cooling water that is treated with a dispersant corrosion inhibitor,
sodium hypochlorite and a non oxidizing biocide. Blow down water will be sent to the 2 chiller
sumps and ultimately pumped to the cooling tower basin.
HRSG and Aux Boiler Blow Down
All blow down from the HRSG drains, Aux. Boiler, demineralizer water treatment and the boiler
'blow down tank are routed to1he boiler blow down sump. This sump pumps, its effluent to the
,cooling tower basin.
Closed Loop Cooling System
The closed loop cooling system blow down from the heat exchangers that is also routed to the
cooling tower basin.
Sanitary Waste System
Sanitary waste is routed through the lift station and pumped to a package plant This unit includes
a chlorination chamber (sodium hypochlorite tablets). Effluent is ultimately pumped to the waste
water sump.
PI'ant Drains System
All yard and floor drains from the generation equipment areas and auxiliary systems are routed to
a common drain system and through an Oil Water Separator (OWS). The OWS discharges to the
wastewater collection sump.
Drains from the water treatment building area, fire,protecti6n system, sanitary waste system„
condenser circulating system and cooling tower blow down are routed to a wastewater collection
sump. This effluent is pumped to Outfall 001 through internal outfall 001A.
Containments for all transformers are all routed through the oil water separator and ultimately to
the waste water sump. Drains from the cooling tower chemical feed sumps, ammonia storage
tank-containment and chemda[ unloading areas are routed to the plant drain system ultimately to
the wastewater sump.

Dan River Steam Station, Rockingham County
NPDES PermitNo. NCF 9V.,468,,
Page 15 of, 16
Compressor Wash Sumps
Each combustion, turbine unit,is equipped, with a 6,000 gallon compressor wash water sump.
Periodically, the combustion turbines receive anon line or off line compressor wash. This activity
involves injecting water with a mild detergent into the compressor section of the turbine and
subsequent rinse cycles. The off line wash generates approximately 4,000 - 5000,gallons of waste
water per turbine. This activity occurs between 3 -5 times per year per turbine.
Outfalt 001
The discharge for the combined cycle station which includes the discharge from the waste sump
and cooling tower blow down, is routed to the coal plants discharge piping to Outfall 001 through
internal Outfall 001A. The combined,cycle station will construct an in line sampling point to
monitor discharge independent,of °the Outfall 001,. Bisulfite injection is being utilized to control
potential discharge of chlorine via the cooling tower. Also, cooling' tower operation eliminates the
risk of thermal loading to the Dan River.
DAN RIVER CTCC Chemical and
Tank Information
Feed
Condensate /Feed waiter/Boiler Rate
HRSG11 Phosphate 300 gal tank 0 -' 250 gpd
HRSG12 Phosphate 300 gal tank 0 - 250 gpd
0 -25
Aqueous Ammonia 19% 300 gal tote gpd
Auxiliary Boiler
Ammonium Hydroxide 0 - 0.5
19% 300 gal tote gpd
0 -05
Oxygen Scavenger 300 gal tote gpd
Coolinci Tower
Di"spersant/Corrosion
,Inhibitor
Sodium Hypochlonte 125
Non - Oxidizing Biocide
Sodium Bisulfite
0 -50
'2000 gal,tank gpd
6000 gal tank 0 - °500 gpd
300 gal tote 0 - 500 gpd
0 -3
300 gal tote gpd
Cooling Tower Chiller A/B
Dispersant/Corrosion
Inhibitor 2000 gal tank
Sodium Hypochlonte °
12.5% 6000 gal tank
Non - Oxidizing Biocide
Corrosion ,Inhibitor
Closed, Cooling
Biocide
300 gal tote
300 gal tote
0'- 5
gpd
0 -20
gpd
0 -50
gpd
0 -1
gpd
Chemical feed tank is shared' with Cooling Tower
Chemical feed tank is shared with Cooling Tower
Chemical feed tote is shared with Cooling Tower
Pot feeder in loop - manual dosage - monthly

r
Propylene Glycol
_Filtered Water.System
Sodium Hypochlonte
12:5%
Clarifier Polymer
Thickener Polymer
Coagulant
Sodium Hydroxide
UF/RO /Demin
Citric Acid
Sodium Hypochlorite
125%
Antiscalant
Sodium Hydroxide 2'5%,
Sodium Bisulfite
Selective - Catalytic
Reduction, (SCR)
Aqueous Ammonia 19%
Pot feeder in loop - manual dosage - monthly
6000 gal tank
300 gal tote
300 gal'tote
19000 gal tank
Tank size and c
300 gal tote
300 gal tote
300 gal tote
300 gal tote
300 gal,tote
20000 gal tank
Sariitarv`Wastewater,Package Plant
Sodium'Hypochlbrite Tablets
0 - 576 gpd
0-24
gpd
0 - 108,gpd'
0 -,576 gpd
laily feed undetermined
0 -48
gpd
0 -48
gpd
0 -16
gpd
0 -16
gpd
0 -16
gpd
Dan River Steam Station, Rockingham County
NPDES Permit'No. NC0003468
Page 16 of 16
Chemical feed tote is shared with Cooling Tower
Refill as needed
1