Allen Steam Facility

&jf
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality -
Beverly Eaves Perdue Coleen H Sullins
Governor Director
July 6, 2009
Mr. Steven Irnmel, General Manager II
Duke Energy Carolinas, LLC- Allen Steam Station
253 Plant Allen Road.
Belmont, North Carolina 28012
Dear Mr. Immel:
Dee Freeman
Secretary
Subject: NPDES Permit major modificatibn
Permit No. NC0004979
Allen Steam Station
Gaston County
Division personnel have reviewed and approved your request for major modification.
Accordingly, we ate forwarding the attached NPDES discharge permit. This permit is modified
pursua.ntto the requirements of North •Carolina General Statute 143-21,5:1 and the
Memorandum of Agreement between North Carolina and the U.S. ,Environmental Protection
Agency dated October 17, 2007 (or as subsequently amended.)
This permit modification addresses the request for a major modification regarding the
elinunation bf'the selenium limit at Outfall 002.'
The permit authorizes Duke Energy Carolinas, LLC to discharge treated industrial
wastewater from the Allen Steam Station Wastewater Treatment Plant to the Catawba River and
the South Fork Catawba River, class WS -1V and B waters in the Catawba River Basin. The f nal
permit includes discharge limitations/or monitoring for flow, oil and grease, total suspended
solids, arsenic, chloride, copper-, iron, mercury, nickel, selenium, zinc, total nitrogen, total
phosphorus, pH, and chronics toxicity. `
The following modifications included in the May 6thdraft permit remain in the final
permit:
• The weekly average effluent limit for selenium at Outfall 002 has been deleted. Data
analysis indicated that there was no reasonable potential for this parameter to exceed the
water quality standard in the receiving stream. There'will be monthly monitoring of total
selenium at -both Outfall 002 and internal outfall 005.
1617 Mad Service Center, Raleigh, North Carolina 27699-1617
Location 512 N Salisbury St Raleigh, North Carolina 27604 One
Phone [phone] \ FAX [phone] \ Customer Service 1-877.623.6748 NorthCarohna
Internet www ncwaterquallty org N
at9,�a�/I ,
An Equal Opportunity\ Affumahve'ActionEmployer �i `✓U

Letter to Mr. Immel
Page 2
Due to the, new wastestreain from the Flue Gas, Desulfurization WWTP that will_ be
discharged into the ash settling basin above Outfall 002, quarterly monitoring for the
following parameters will now be required at Outfall 002: total arsenic, total cadmium,
total chromium, chloride, total mercury,, total nickel, total silver, total zinc, and total
beryllium. - Quarterly monitoring for these parameters is the minimum, 'requirement for a
major industrial discharger to North Carolina streams.
• Please note that there have been minor language changes and the addition of a new
paragraph regarding data submittal in special condition A. 14. Chronic Toxicity Pass/Fail
permit limit. f,The new paragraph is located second from the end of the condition).
If any parts, measurement frequencies or sampling requirements contained in this permit
modification are unacceptable to you, you have the right to an adjudicatory'hearing upon written
request within thirty (30) days, following receipt of this letter. This request must be in the form of a
written petition, conforming tQ Chapter 150B of'the North Carolina General Statutes, and filed with
the office of Administrative Hearings, 6714 Mail Service Center, Raleigh, North Carolina 27699-
,6714. Unless such a demand is made, this permit shall be final and binding.
Please take notice that this permit is not transferable. The Division may require modification
revocation and reissuance of the permit. This, permit does not affect the legal requirements 'to
obtain other permits which may be required by, the Division of Water Quality, or permits required by
the Division of Land Resources, Coastal Area Management Act, or any other Federal or Local,
governmental permits may be required.
If you have any questions or need additional information, please contact Ms. Jacquelyn
Nowell at telephone number (919) ,807-6386 or email jackiernowell@ncdenr:gov.
Sincerely,
�,- Coleen H. Sullins
cc: EPA Region IV
Mooresville Regional Office/Surface Water Protection Section
DEH/ PublicWater Supply'Section/Mooresville Regional Office,
Aquatic Toxicology Unit
NPDES ,F.ile%NC0004979,.

STATE OF NORTH` CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIi'ISION OF ti v'?�TER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION -SYSTEM
In compliance with the provision of North Carolina General.Statute 143-215.1, other lawfulstandards
and regulations promulgated and adopted`by the North Carolina Environmental Management
Commission, and theTederal Water Pollution Control Act, as amended,
Duke Energy Corporation
is hereby authorized to discharge wastewater from a facility located at the
Plant Allen Steam Station
253 Plant Allen Road (NCSR 2525)
Belmont
Gaston County
to receiving waters designated as the Catawba and South Fork Catawba Rivers in the
Catawba River, Basin in accordance with effluent limitations, monitoring requirements, and
other conditions set forth in, Parts I, II, III and IV hereof.
This permit shall become effective August 1, 2009.
This permit and authorization to discharge shall expire at rni'dnight on May 31, 2010.
Signed this day July 6, 2009.
;i
oleen H. Sullins, Director
ivision of Water'Quality
By Authority of the Environmental Management Commission

Permit NC0004979
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked. As of
this permit issuance, any previously issued permit bearing this numerls no lodger effee ive Therefore, the
exclusive authority to operate'and discharge from this facility arises under the permit`conditions, requirements,
terms, and provisions included herein.
Duke Energy Corporation is hereby authorized to:
1. Continue to discharge:
• Once through cooling water (ourrai1001)
• Operate a septic tank,and ash pond with pH adjustment and discharge domestic
wastewater, stormvvater runoff, ash sluice, water treatment systems wastewaters, FGD
system blowdown, landfill leachate, and miscellaneous cleaning and maintenance
wash waters (002).
• Coal yard sump overflow (002A) and power house sump overflow (002B)
• Miscellaneous equipment non -contact cooling and sealing water (003)
Miscellaneous non -contact cooling water, vehicle, washwater, and intake screen
backwash,(004)
From a facility, located at the Plant Allen Steam,Station on Plant Allen Road (NCSR 2525),
south of Belmont in Gaston County, and
2. Without adding detergents or chemicals of -any kind, discharge Asiatic clam/debris filter
backwash (of the intake filter screen) (see Part A.7); and
3. Continue to operate a Flue Gas Desulfurization (FGD) wet scrubber'wastewater treatment
system discharging to the ash settling basin through internal outfall 005; and
4. Discharge from,said treatment works at the location specified omthe attached map into, the
Catawba River (outfalls 002, 002A, 002B' and 004) and the South, Fork Catawba River (outfalls
001 and 003) which are classified Class WS -V B waters, respectively, in the Catawba River
Basin.
2

Duke Energy Corporation
Allen Steam Station
State Grid/Ouad:
G l4NE%Belmont Permitted Flow: Not lirruted
Receivirta Streams:
Catawba and South Fork Catawba Rivers -
Stream Class:
WS -V & B
Dramage,Basin:
Catawba River,Basin Sub -Basin: 03-08-34
Latitude (001):
35' 11' 23" N Longttude (001): ,81° 00'45t' W
Latitude (002):
35° 10' 30" N Longitude (002): 81° 00' 23" W
Latitude (062A)-
35° 1 l' 34" N Longitude (002A): 81° 00'2T' W
I atitude (0026):
35° 1 1' 36" N Longitude (002B): 81° 00' 30" W
Latitude (001):
35° 11' 35" N Longitude (004): 810 00' 22" W
Latitude (A. Clam):
359 11'36" N Longitude(A. Clam): P'00' 30" W
�1Vlap not to scale
Facility 't
Location
jl n
NPDES Permit No. NC0004979
TN6 Gaston Count

Permit NC0004979
A. (1.) EFFLUENT,LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 001)
During the period beginning on the effective date,of this permit and lasting until=expiration, the Permittee is
authorised to discharge from o itfall 001- Condenser Cooling Water,(CCW). Such discharges shall be.limited
and monitored by the P eraiiiiee as specified below:
EFFLUENT
LIMITS
MONITORING REQUIREMENTS
`CHARACTERISTICS
Monthly
Daily
Measurement'
Sample4Type
Sample Location r
Average
Maximum
Frequency
Flo`y
Daily
Pump Logs
Effluent
Temperature
(June 1- Se `tember 30)1
38.9 °C
(1'02 °F)
Daily
Grab or
Instantaneous
Effluent
Temperature
(October 1- May 31)1
`35 °C
(95 °F)
Daily
Grab or
Instantaneous
Effluent
Notes:
1. The Regional Administratorihas determined pursuant to Section 316(a) of the Act that the thermal'
component of the discharge,assures Chi? protection and propagation of a balanced, indigenous population of
shellfish, fish, and wildlife in and on the receiving body of water.
Chlorination of the once through condenser -cooling water, discharged through outfall 001, is not allowed
under -'this permit. Should Duke Power wish to chlorinate its condenser cooling water, a permit
modification must be requested and received prior to commencing chlorination.
3

Permit NCO004-979
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002)
During the period beginning on the effective date of this permit and lasting until expiration, the Permittee is
authorized to,discharge from oulfal1002,-,ash-pond effluent. ;Such discha"rgesishall`be `umited and monitored
by the Permittee as specified below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING.REQUIRE_MENTS _
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency'
Sample Type
Sample Location
Flow
Weekly
Instantaneous
or Estimate
Influent or,
Effluent
Oil and Grease -
15.0 mg/l
20.0 mg/1
Quarterly
Grab
Effluent
Total Suspended Solids
30.0 mg/1
100.0 mg/l
Monthly
Grab
Effluent
Total Copper2
1.0 mg/l
2/Month
Grab
Effluent
Total Iron
1.58 mg/1
Monthly
Grab
Effluent
`Total Selehium2
Monthly
Grab
Effluent
Total Arsenic2
Quarterly
Grab
Effluent
Total Cadmium2
Quarterly
Grab
Effluent
Total Chromium2
Quarterly
Grab,
Effluent
Chloride
Quarterly
Grab
Effluent
Total Mercury2
Quarterly
Grab
Effluent
Total Nickell
Quarterly
Grab
Effluent
Total Silver2
Quarterly
Grab
Effluent
Total Zinc2
Quarterly
Grab
Effluent
Total Beryllium
Quarterly
Grab
Effluent
Total Nitrogen
(NO2 + NO3 + TI(N)Semi-annually
Grab
Effluent
Chronic Toxicity'
Quarterly
Grab
Effluent
pH3
Monthly
Grab
Effluent -
Notes:
1. Whole,Effluent Toxicity,shall be monitored by chronic toxicity (Ceriodaphnia) P/F at 24%. Tests shall be
conducted -in January, April, July and October (see Part A.(9.),for details)
2. Total metals are defined by 40'CFR 136. Any method specified, by 40 CFR 136 is considered acceptable for
analysis.
3. The pH,shall not be less than 6.0 standard units nor greater than 9.0 standard units.
. Thereishall be no discharge �ofAoatin&solids or foam,vi'siblerin other,than trace amounts.

Permit NC0004979
A.'(3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002A)
During the period,beginning on the effective date of this permit and lasting until expiration, the Permittee is
authorized to discharge from outfall, 002A - Coal Yard'Sump Overflows. Such discharge&shall be'united and
morstored by the Permittee as specified beloi
EFFLUENT
CHARACTERISTICS
LIMITS
i
MONITORING REQUIREMENTS'
-
Monthly
Average
Daily
Maximum
'Meas'urement
Fre uen_
Sample Type
Sample Location
Flow
Episodic
Estimate
Effluent'
pH
Episodic
Grab
Effluent
Oil and,Greasez
15.0 mg/1
20.0 mg/1
Episodic
Grab
Effluent
Total Suspended Solids2
30:0,mg/l
100.0 mg/l
Episodic.
Grab
Effluent
Fecal Coliform
Episodic
Grab
Effluent
Total Iron3
1.0 mg/1
Episodic
Grab
Effluent
Notes:
1. Effluent sampling shall be conducted at a point upstream of discharge to the,receiving stream.
2. Monthly averagedimits for total suspended solids and oil and grease only apply if the, overflow occurs for
more than 24 hours.
3. Sampling,for iron is required,only wherVTSS is reported as greater than 100 mg/L.
There shall be no discharge of floating solids, or foam visible in other than trace amounts
All flows shall be reported. on monthly DMRs. Should no flow occur during a given month, the words "no
flow" should be clearly written'on the front ofthe DMR. Episodic sampling is required,per occurrance
when sump overflows,occur for longer'than one hour. All samples shall be of a, representative discharge.
W1

Permit NC0004979
A. (4.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 002B)
`Durin&the period'beginning on the effective date of this permit and lasting until expiration, the Permittee is
authorized to discharge from outfall 002B —Power House Sump Overflows. Such discharges shall be limited
and monitored by the Permittee as specified beloiv:
EFFLUENT
CHARACTERISTICS
LIN41TS
MOM TORING REQUIREMENTS
,Monthly
Average
Daily
Maximum
Measurement
Frequency'
Sample Type
Sample Location,
Episodic
Estimate
Effluent'
tFlow
EGreasel
Episodic
Grab
Effluent
15.0 mg/l
20.0 mg/l
Episodic
Grab
Effluent
Total.Suspended Solids2
30.0 mg/l
100.0 mg/l
Episodic
Grab
Effluent
Total C9pper3
1.0 mg/l
Episodic
Grab
Effluent
TotalIron3
1.0mg/l
Episodic
Grab
Effluent
Notes:
i. Effluent sampling shall be conducted at a point upstream of discharge, to the receiving stream.
2. Monthly average limits for total suspended solids and oil and grease only apply if the overflow occurs1or
more`than 24 hours.
3. The limits for total copper and total iron only apply duringa chemical metals cleaning.
There shall be no discharge of floating4solids or visible foam'in other than trace amounts
All flows shall be reported on monthly,DMRs. Should no flow occur during'a givenmonth, the words "no
flow" should be clearly written on -the front of the DMR. Episodic sampling is required per occurrence
when sump overflows occur for longer than one hour. All samples shall be of a representative, discharge.
2

Permit NC0004979
A. (5.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 003)
Durmg the period,beginning on the effective date of this'permit-and lasting u+-►tiI expiration, L11 Permittee is
authorized to discharge4r6m outfall,003 - miscellaneous equipment;non-contact, water and sealing, water.
Such discharges,shall be.limited an&monitored by°the Permittee as'specifiedbelow:
EFFLUENT
LIMITS
MONITORING REQUIREMENTS
CHARACTERISTICS
Daily
Maximum
Measurement
Fre uen
Monthly Daily
I
Measurement, SampleType Sample Location
rFlow
Average Maximum
frequency
Flow
Effluent
Weekly,. Estimate Effluent
Chlorination of the once through, cooling water, discharged through outfall 003, is not' allowed under this
permit. Should Duke Power wish to chlorinate its once,through cooling;water, a permit modification must
be requested and received prion to commencing chlorination.
A. (6.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Outfall 004)
Durmg the period beginning on the effective date of this permit and lasting until expiration, the Permittee is
authorized, to,d'ischargetfrom otitfa11004- miscellaneous non-contact,,cooling water, vehicle washwater; and
intake screen backwash. Such discharges shall be limited and monitored by the Permittee as specified`below:
EFFLUENT
'CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Avera a
Daily
Maximum
Measurement
Fre uen
Sample Type
Sample Location
rFlow
I Weekly
Estimate
Effluent
Oil and Grease
15.O.nig/1
.20:0 mg/1'
Quarterly
Grab
Effluent
Chlorination of the once through cooling water, discharged through outfall' 004, is°not,allowed.under this
permit. Should Duke,Power wish to;chlorinate its condenser,cooling water, a permit modification must be
requested and received prior to commencing chlorination.
7

Permit NC0004979
A. (7.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (Internal
Outfall 005)
During the period beginning,on the,effecti-ve date of this permit and lasting »ntiLper_mit expiration, he
P erliiit' a is authorized to discharge f2'Olh iniernal ouifall 005- treated FGD' wet scrubber wasiewater,io ash
settling basin. Such discharges shall be limited and monitored by the Permittee as specified.below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS -
Monthly
Average-
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location'
Flow
11 Monitor & Report
Monthly
Pump logs or
similar
readings
Effluent
Total Suspended Solids
Monitor & Report
Weekly
Grab
Effluent
Carbonaceous Oxygen Demand
(COD)
Monitor & Report
Weekly
Grab
Effluent
Total Arsenic
Monitor & Report
Weekly
Grab
Effluent
Total Cadmium
Monitor & Report
Weekly
Grab
Effluent
Total Chromium
Monitor & Report
Weekly
Grab
Effluent
Chloride
Monitor & Report
Weekly
Grab
Effluent
Total,Mercury
Monitor & Report
Weekly
Grab
Effluent-
Total.Nickel
Monitor & Report
Weekly
Grab
Effluent
Total Selenium
Monitor & Report
Monthly
Grab
Effluent".
Total Silver
Monitor & Report
Weekly
Grab
Effluent
Total Zinc
Monitor & Report
Weekly
Grab
Effluent
Total Beryllium
Monitor & Report
Weekly
Grab
Effluent
Notes:
1. "Effluent" shall be defined as the discharge from the FGD wastewater treatment system prior to discharge
to the,ash settling basin.
All flows shall be reported on monthly DMRs. Should no flow occur during a given month, the words "no
flow",shall be clearly written on the front of the,DMR. AlLsamplesEshall be of a representative discharge.
DMRs.for this outfall! shall be,submitted only,after discharge commences from the FGD system.
Sampling is only required when this outfall is discharging.
A. (8.) SPECIAL CONDITION'FOR THE DISCHARGE OF ASIATIC CLAM/DEBRIS
FILTER BACKWASH
The'permittee'may backwash the intake filter for Unit 5 condenser cooling water on an as-needed,basis- It is
understood that this wash water will contain materials indigenous,to the Catawba River such as Asiatic clams
and light debris. As these are naturally occurring in the river environment,, they maybe discharged with no
adverse affects to the�receiving stream. The Permittee may not,add any detergent, chemicals or other non -
indigenous material' to the wash water without explicit permission of the Division of°Water,Quality.
D

Permit NC0004979
A. (9.) CHRONIC TOXICITY PASSNAIL PERMIT LIMIT (QUARTERLY)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Certodaphnia dubia;at an effluent concentration of 24%.
The permit holder" shall perform at a minimum, quarterly monitoring using test procedures outlined in -the "North
Carolina Ceriodop,hnia Chronic Effluent Bioassay Procedure," Revised,February 1998, or subseaiient versions or
"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent
versions. The tests will be performed during the -months of January, April, July and October. Effluent sampling for
this testing,shall be performed at the NPDES)permitted final effluentZischarge below allAreatmerit processes.,
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit
limit, then multiple -concentration testing shall be performed at a minimum, in each of the two following months
as, described in "North Ca rolin&Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February
1998) oraubsequentsversions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the highest
concentration having no detectable impairment of;reproduction or survival and the'lowest concentration that does
have a detectable impairment of reproductiori or survival. The definition of"'detectable impairment," collection
methods, exposure regimes,, and further statistical methods are specified, in the "North.Carolina,Phase'll Chronic
Whole Effluent'Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
All.toxicity testing results required as part of this permit condition will be,entered on the Effluent
Discharge Monitoring Form (MR -1) for the months in which tests were performed'. If reporting, pass/fail
results using,the parameter code TGP3B,,TDWQ Form,AT-1 (original) is sent to the•below address. If
reporting Chronic Value results usmg'the parameter code THP3B, DWQ Form AT -3 (original) is to be,sent
to the following address:
Attention: North,Carolina Division of Water Quality
Environmental Sciences Section
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms,shall be filed with the Environmental Sciences Branch no later than 30 days
after the,end of the reporting period for which the report is made.
Test data shall be complete, accurate, include,all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC'or approved designate signature.
Total residual chlorine of the effluent toxicity sample must be measured;and reported if chlorine,is employed,for
disinfection of `the waste stream
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the
permittee will complete the information located at the top of the aquatic toxicity ('AT) test form indicating the facility
name, permit number, pipe number, county, and the month/year,of the report with the notation of "No Flow" in the
comment°area of the form. The report shall,be submitted to the Environmental Sciences Branch at the address cited
above
Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be
required during the following month.
Should any test data from this monitoring requirement or tests performed,by the North Carolina Division of Water
Quality indicate potential impacts to the receiving stream, this permit may be re -opened and modifi6d,to include,
alternate monitoring requirements or limits.
If the Permittee monitors any pollutant more frequently then required by'this permit, the results of such
monitoring shall be included in the calculation & reporting of the data submitted on the DMR & all AT
Forms submitted.
NOTE: Failure to achieve test conditions asFspecified in,the cited document, such;as minimum control organism
survival,,minimum control organism reproduction, andtappropriate environmental controls, shall constitute an
invalid test and will require immediate follow-up testing to be completed no later than the last day of the month
following the month of the initial monitoring.
9

Permit NC0004979
A. (10.) BIOCIDE CONDITION
The permittee shall not use any biocides except those approved in conjunction with the permit application. The
permittee shall notify the Director in writing not later than ninety (90) days prior to instituting use of any
additional biocide used in. cooling systems which may be toxic to agvatic life other than those previo„sly
reported to the DiviSiori of Water Quality. Suet notification shall include curnpiedun of Biucide Worksheet
Form 101 and a map locating the discharge point and receiving stream. Completion of Biocide Worksheet Form
101 is not necessary for those outfalls containing toxicity testing. Division approval is not necessary for the
introduction of a new biocide into an outfall currently being tested for toxicity.
A. (11.) SPECIAL CONDITIONS
The following special conditions are applicable to all outfalls regulated by NC0004979:
• There shall be no discharge of polychlorinated biphenyl compounds.
• It has been determined from information submitted that the plans and procedures in place at Allen Steam
Station are equivalent to that of a BMP.
• The permittee shall report the presence of cenospheres observed in any samples.
• The applicant is permitted to discharge chemical metal cleaning wastes to the ash basin under the conditions
outlined in the 1976 Riverbend Ash Basin Equivalency Demonstration and the 1994 Allen Steam Station
permit application
• The permittee shall check the diked areas for leaks by a visual inspection and shall report any leakage
detected
• If the permittee, after monitoring for at least six months, determines that he/she is consistently meeting the
effluent limits contained herein, the permittee may request of the Director that the monitoring requirement
be reduced to a lesser frequency.
• Nothing contained in this permit shall be construed as a waiver by the permittee or any right to a hearing it
may have pursuant to State or Federal laws or regulations.
• Low volume waste is defined as follows (as per 40 CFR 423.11(b):
"Low volume wastes sources include, but are not limited to: wastewaters from wet scrubber air pollution
control systems, ion exchange water treatment system, water treatment evaporator blowdown, laboratory
and sampling streams, boiler blowdown, floor drains, cooling tower basin cleaning wastes, and recirculating
house service water systems. Sanitary and air conditioning wastes are not included.”
A. (12.) SECTION 316 (B) OF CWA
The permittee shall comply with the Cooling Water Intake Structure Rule per 40 CFR 125.95.
HE

NCDENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
Duke Energy Corporation — Allen Steam Station
NC0004979
'Fa8lit
iIrif'o`rniatioii,71,
(1.) Facility Name:
Allen Steam Station
Q.) i ermitted;Flow (MGD):
No flow limit
(6.) County:
i' Gaston
(3.) Facility Clwss:'
I
(7.) -Regional Office:, ;1Vlooresville
(4.) Pretreatment Program: _ N/A
(5.) Permit Status: Renewal_ _ _
_14N _
(8.) VSGS To Quad:_ GE
(9.) USGS Quad Name: -Belmont
_ , Streaiii aractenstics
(1.) Receivin&Stream:
Catawba /
South Fork
Catawba Rivers
(7.) Drainage Area (mi2):,
??'/635
_
(2.) Sub -basin:
(3J Stream Index Number:.
( 03708-34
111-123.5
(S.) Summer 7Q1'CO(fs): _ '1;95/124
(9.) Winter`7Q10 (cfs):
[ 95/227
(4.) Stream,Classification:
I WS=V B
(10.) 30Q2 (cfs):
; 3141/309
(5.) AW) Status:
j Not listed
�(11.) Average Flow (cfs): ,,
2,4702/806,
(6J 305(b) Status: -
( -
(12.) IWC %: 'i'24 (04tfa]1002)
Notes:
1 30Q2 for the Catawba Ihver has,beein_defined=as the mini,,;um dally average release at Mountain Island
Hydro
2. Average flow (QA) for the,Catawba,River has been defined as mean annual flowbased on operations
records from 1929 to 2003 at Mountain Island Hydro.
1.0 Request for permitmodi'fication
• Duke -Energy Carolinas ,LLC has, requested a permit`modification seeking to eliminate the
selenium limit for Outfall'002 (Ash Pond, Effluent). A review,of selenium data from October
2006,through December 2008 and its inclusion in a reasonable potential analysis will
determine whether, the selenium limit can be removed.
• During the modification review, the Division,received the Engineer's Certification (February
2009) confirming the construction and installation of the Flue Gas Desulfurization (FGD)
wastewater ,treatment plant at the Allen Steam Station. Upon completion of the FGD
WWTP, monitoring requirements at internal outfall 005,became effective.
2.0. Summary
Duke Energy's Allen Steam Station is a coal fired steam electric plant in Gaston County.
Effluent Guidelines are°provided in 40 CFR 423.12. The facility is also subject to, the Cooling
Water Intak-&Structure, Rule (316(b) Rule), per 40 CFR 125.95. A,special condition was added
duringIhe 2006 permit'renewal expressing this requirement (See Section A.12'. of permit).

NP -DES Permit Fact Sheet - 04/22/09
Page'2
Duke rower/ Alien Steam Station
,NC000A979
The facility has four permitted outfall's in the current NPDES discharge permit, issued in
'September'2006.
➢ Outfall 001 is comprised of once through, non -contact condenser co-chair; water. The
average flow through1his outfail was 626,MGD (per,2004 permitapplication)'. ltus
outfall discharges to'the South Fork Catawba River.
➢- Outfall 002 is the ash basin discharge. The average discharge from this outfall' is 19.3
MGD. This outfall discharges to,the Catawba River.
➢ Outfalls 002A and 002B'are intermittent discharges of'emergency overflows (coal yard,
sump overflow and power house sump overflow, respectively). Both outfalls
discharge to the Catawba River. Federal regulations require a daily max TSS limit for
coal pile runoff (from a rain event) of 50 mg/L. The layout,for this,coal yard. sump is
such that an overflow would,mostYhkely be low volume wastewater instead of'coal pile'
runoff. Chemical metal cleanings do not go to this sump. Therefore it was'agreed,that
the limits for this sump should be O&G 20.mg/L daily max and 15 mg/L monthly
average and'TSS of 100 mg/L daily max and,30 mg/L monthly,average.
➢ Outfall 003 is miscellaneous,once'through non -contact cooling water. This outfall
discharges to the South Fork Catawba River and averages 4:5 MGD (from 2004 permit
application).
Outfall' 004 is also miscellaneous once through non -contact cooling water. This outfall
discharges to the Catawba River and averages 6.5 MGD (from 2004 permit application).
> During the.2002 permit renewal, the facility received authorization to backwash an
intake,filter for Unit 5 condenser cooling water on an as -needed basis. The wash
waters contain materials indigenous to the Catawba -River such as Asiatic Clams and
light debris. This special condition (A.8.) remains in the perm&allowing forthis
discharge.,
In 1995 the facility completed,construction of a Chemical Injection Facility foi,the ash basin. The
purpose of this, project was to,assist with the settling of selenium and other pollutants that were
not being removed from the effluent. This project .corisisted of the construction of three primary
settling cells,,a treatment channel,,a chemical injection,system (ferrmsulfate to enhance selenium
precipitation) and a finalsettling/,flocculation cell.
In February 2009, the,Division received the engineer's certifications indicating the completion of
the construction of the modifications and improvements to the Allen,Steam,Station, Flue Gas
Desulfurization (FGD) WWTP and the installation of approximately 8200 linear feet of 14 inch
force main'to,the ash basin from the new FGD WWTP. Upon completion of -the FGD, WWTP, the
monitoring requirements associated with internal outfall 005 became applicable. This'mcluded
monthly monitoring for flow, and weekly monitoring for TSS, COD, arsenic, cadmium_,
chromium, chloride, mercury, nickel, selenium, silver, zinc, and beryllium.

NPDES Permit Fact Sheet — 04/22/09 Duke Power/ Alien Steam Station
Page 3 NC0004979
3.0 Comphance,Surnmary
DMR Data Review
Since the mod request was only for selenium, DMRs were reviewed for only effluent selenium
data from outfall 002 for the period of October 2006 through December 2008. The average flow
from 002 from 2006 through,2008 was 19.3 MGD.
The following table summarizes DMR data for non4oxicants at outfall 002. An RPA was
performed for selenium using, the submitted data, and an average wasteflow of 19.3 GMD..
4.0 RPA Analysis
An RPA was performed for total selenium only. Since the facility does not have a permitted flow
lirnii,,past RPAs were conducted using the.monthly average flow instead -of permitted flow. The
same methodology was retained in this modification. Current average,flow at outfall 002,is 19.3
MGD.
The current peirruthas,a selenium, limit of 21 µg,/L. NC has a selenium aquatic life water quality
standard of 5.0 jig/L. According to Division policy, this criterion can be expressed as a weekly
average limit. Based on the 2006 RPA analysis, and selenium indicating reasonable potential to
exceed the water quality standard, the.facihty received a weekly average selenium limit of 21
µg/L during the last renewal. This modification requests that the selenium limit be reevaluated
since:nearly two{years of effluent data has been collected.
A RPA and review of submitted selenium now indicates that there is no reasonable,potential.to
exceed the water quality standard, in the receiving stream. It is recommended that the weekly
average,selenium limit be removed and that monthly selenium monitoring remain at Outfall
002.
Additional monitoring to Outfall 002
Since the,installation of the FGD WWTP, a new wastestream of treated wet scrubber wastewater
will be discharged to the ash pond of'Outfall 002. Itis recommended that quarterly monitoring
for,segeral parameters be added to Outfall 002 to determine,the concentiations thattmay be
discharged with the FGD -treatment. DWQ is aware,thatmost of these parameters were
previously monitored,at 002 in the years 2002 through 2005 and were dropped in 2006.
However, DWQ has consistently placed additional monitoring to any power plant ash ponds that
are now receiving FGD wastewater. The frequency of quarterly monitoring is the minimum
requirement for amajor industrial discharger and will provide enough data in a five,year'permit
cycle ,to evaluate with.the RPA.
'There will now be quarterly monitoring at Outfall 002' for total arsenic, total cadmium, total
chromium, chloride,.total mercury, total nickel, total silver, total zinc, and total beryllium.
4.0 Proposed Schedule for Permit Issuance
Draft Permit to Public.Notice: 5/6/09
Permit Scheduled to Issue: 6/29/09

NPD1iS fermi, Fact -Sleet — 04/22/09 Duke Power/ Alien Stearn, Station
Page 4 NC0004979
5.0 State Contact Information
If you have any questions on any of�the above information or on the'attached permit, please
contact Jacquelyn M. Nowell at X919) 807-536.
Copies of the following amattached to provide further information on the permit development:
• Draft permit
• RPA analysis
Signature 4� ^ A '
I
Date �,L�/Z''�
Regional Recommendation.by: _
Signature, Date
Reviewed and accepted by
Regional nal Supervisor:
Signature Date
NPDES Unit Supervisor:
Signature Date
F

REASONABLE POTENTIAL ANALYSIS
Duke Energy -Allen Stearn Station
NC0004979
Time Period 102006-122006
Ow (MGD) 19.3
WWTP Class 1
701OS (cls) 95
IWC (%) ® 7010S 23.948
7010W (ors) 95
® 701OW 23.948
3002 (cls) 314
® 3002 8 6984
Avg Stream Flow, OA (cls) 2470
® OA 1.1966
Rectnng Stream Catawba River
Stream Class WS -V B
Outfall 2
Ow =19.3 MGD
'Legend " Freshwater Discharge
C = Carcinogenic
NC= Non-carclnogen/c
A = Aesthetic
4979rpa2009semod xis, rpa
422009
STANDARDS &
PARAMETER
TYPE
CRITERIA (2)
POL,
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
�I '(1)
I
1NOwasl KFAV1
n Otbt ttexftdCW Aliowxbb OW
_
chmnk Acub,
Acute WA
Arsenic
C
10
ug/L
0 0
WA
-
Chronic ---835--
_-'-------_--------_ -'-'-'---
Acute WA
Beryllium
C
65
ug/L0
0
WA
�
___
-
- - -
_ _
Chronic 543
- - _______c_._.______________
Acute 15
-
Cadmium
NC
2 15
ug/L
0 0
N/A
.-_
8_.
Chronic
Acute 1,022
_
Chromium
NC
50 1,022
ug/L
0 0
WA
'Chronic --- �--
-------------------------------
Acute 7
Copper
NC
7 AL, 73
ug/L
0 0
WA
'Chronic _- 29-_-_---------------�-�-'-------
Acute 22
Cyanide
NC
5 N 22
10
ug/L
0 0
WA
Chronic 21
Acute WA
Fluorides
' NG
1;800
�ug/L
0 0
WA
-_-
Chronic, 7,516
-_-_-_---_--------_----- -
Acute 34
Lead
NC
25 N 338
ug/L
0 0
WA
Chronic ---1--
04
-----,-------'-'---------------
Acute WA_
Mercury
NC
12
20000
ng/L
0 0
WA
_ _nic 5 __ __
Chro0
_________________
Acute N/A
"
Sulfates
,NC
250,000
ug/L
0 0
WA
_ __ _ _
Chronic 1,043;916
____._----__________.____--__-.
Acute 261
Nickel
NC
25 261
ug/L
0 0
WA
-------------------------_-.---
Acute WN/A
Phenols
A
300 N
ug/L
0 0
WA
Chronic 3,449,--
--5-----------------------------
Acute 56
Max prod value Is k chronic and acute allowable cone
Selenium
NC
50 56
ug/L
54 54
175
No rea`soneble_pc;6nOeltoexceedthe -all ow_ablas__
_ _
Chronic 21
Recommendation ,Limn for Se can be removed Quarterly
monitoring for Se should remain for outfalls 002 & 004,
I
-
Acute 1
Silver
NC
006 AL 1 23
ug/L
0 0
WA
-
- -
Chronic .__0__
Acute 67
-
Z(nc
NC
50 AL 67
,ugIL
0 0
WA
Chronic'
'Legend " Freshwater Discharge
C = Carcinogenic
NC= Non-carclnogen/c
A = Aesthetic
4979rpa2009semod xis, rpa
422009

REASONABLE POTENTIAL ANALYSIS
Selenium
19207
46111
04165,
54
14500
121
175
4979rpa2009semod xls, data
-2- 4/2/2009
Gate
Data
BDL=1/2DL
Results
1
Oct -2006 -`
27
2 7
'Std Dev
2
$
36
36
Mean
3
5
50
'CV
4`,
_
5'
50
n
5
_
5,7
57
6
93
93
Mult Factor =
7
25
25
Max Value
18
33
33
Mai Pred Cw
9
32
32
10,
36
3`6
11
44
44
12
25
25
13
49
49
14
54
54
15
4,3
43
16
6
60
1,7
9
90
18
Jun -2007
121
121
19
4'5
45
20
52
52
21
35
35
22
39
39
23
48
48
24
6`1
61,
25
48,
48
26
41
41
27
57
57
28
33
33
29
57
57
30
73
73
31
27
27
B2
31,
31
33
32
32
34
35
35
35
45
45.
36
52
52
37
53
53
38
42
42
39
3
30
40
3'7
37
41
38
38
42
61
61
43
91
91
44
44
44
45
59
59
46
'29
29
47
48,
48
48
41
41
49
24
24
50
''
29
29
51
2 8
2'8
52
45
45
53
x':
26
26
54
29
29
55
56
57
58
-
59
60
199
200',
19207
46111
04165,
54
14500
121
175
4979rpa2009semod xls, data
-2- 4/2/2009

Beverly Eaves Perdue
Governor
MEMORANDUM
NC®ENR
North Carolina Department of Environment and Natural Resources
Division of ;Water Quaiity
Coleen K Sullins
Director
May,6, 2009
To: Britt Setter
NC'DENR./ DEH / Public Water,Supply Section RegionaLEngineer
Mooresville Regional Office
From: Jackie Now41 1
NPDES Western Program
Subject: Review of Draft Permit 9C0004979
Duke Energy — Allen Steam Station
Gaston County
Dee Freeman
Secretary
47,
Please indicate below your agency s position or viewpoint on the draft permit and return this form by June 12, 2009.
If you have any questions on theidtafttpermit-,please contact me at 919-807-6386,or e-mail to
[e-mail].
RRRRRRRRRal3RRRRRRRRRRl3Rl3RRRRRRRRRRR�RRRRR
ZRESPO: (Check one)
cuf wiih-the issuance ofthis pernut provided the fadhty is operated and maintained properly, the stated effluent
nuts areJmet prior,to discharge, and,the discharge does not contravene theAesignated water quality standards
C�
Concurs with issuance of the above permit, provided the following conditions are met:
1-1
Opposes the,issuance of the above permit, based on reasons stated below, or attached:
1617 Mad Service Center, Raleigh, North Carolina 27699-1617
Location 512,N Salisbury St Raleigh, NorthlCarolina 27604 One
Phone -919.807-6300,1 FAX'919-807=6492,I,Customer Service 1-877.623-6748 NorffiCarolina
Internet www ncwaterqualily org /
An Equal Opportunity 1 Affirmative Acton Employer Nightrally

Nowell, Jackie
From: Hyatt [e-mail] gov
Sent: Monday, May 11, 2009 1:27 PM
To: hackie nowell@ncmail net
Subject: N00004979, Plant Allen Steam Plant
EPA has no comments on this draft permit modification.
ti

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The Charlotte Observer Pub`lish'ing Co:
Charlotte, NC
North Carolina ) ss Affidavit of Publication
Mecklenburg County)
THE ,CHARLOTTE OBSERVER
-----------------------------------------------<--+------------------------
DINA SPRINKLE
NCDENR/DWQ/POINT SOURCE BRANCH
1617 MAIL SERVICE' CENTER
RALEIGH NC 27699
REFERENCE: 3UU65432
6342009 wastewater discharge
Before the undersigned, a Notary Public of said
County and State, duly authorized to administer
oaths affurmations, etc., personally appeared,
being duly sworn or affirmed according to law;
doth depose and say that he/she is a i
representative of The Charlotte Observer
Publishing Company, a corporation organized and
doing business under the laws of the State of
Delaware, and publishing a newspaper known as The
Charlotte Observer in the city of Charlotte,
County of MeckLenburg, and State of North Carolina
and that as such he/she is familiar with the i
books, records, files, and business of said
Corporation and by reference to the files of said
publication, the attached advertisement was
inserted. The following is correctly copied from
the books and files of the aforesaid Corporation i
and Publication. I
PUBLISHED'ON: 05/08
AD SPACE.- 58 LINE
FILED ON: 05/15/09
NAME: TITLE
DATE:
In Test -i mony 'Whereof I have hereunto set my,harid and affixed my seal,, the
day and year afor said.
My Commission Expires May 17, 201'1
Notary: My Commission Expires: —/_/_

,RDFS Permit Amendment -06/28/06
Page 3
Flue Gas Desulfurization Wastewater, Characteristics
AI
Duke Power/ Allen Steam Station.
NC0004979
Potential
Parameters of
Concern
Projected
Average
concentrations
in FGD
wastewater
( L)
Projected Projected
Concentrations Average
after WWTS Concentrations
(pg/L) at Outfall 0002
(pg/L)
_ _
Applicable
Water
Quality
Standards
(pg/L)
Antimony
0:02
0.01
0.01
5.6E
Arseeic l J05
0._28
<0.14
(L0;1'4,':
�Oc
JBari-&-0` ,
gl
4.9
<2.5
1000
xBei llium 9os
0.035
<0.02
: _<0?Q005 ;p
0'0068C)
Boron
20
10
1.54
a750t Y
Cadizuurri ;-doS
0.07
0x005
<0°.©005
15.OA
COD
450
225
31
11 orid&e,
2997
1499
X044 nri
250000
Chrouutiiri"a0'os_'_
0.40
0.20
t 10 0GVN-V
1022A
Cobalt
0.37
0.18'
<0.030
-
Co er V
0.44
0.22
7.3^
Hluonde V
52.2
26.1
3:46x;
1800
kead,m
0:30
0.15'
0^0
318A
saran
574'
2.8 -
-' , _ _
200
t ecu ° ` '' wS
0.35
0.0005
<0 0001
0.012
Molybdenum
0.43
0.21
0.07
-
,zNcke o,,
0.70
0.40
0l, 6' '
261A
LSSeleryjur 6K
60 _
0`05
40:014
56A
Sf ilei 005'
0.07
'0.030005`t'
1:23A
MI' ate .
1500
750
Pf4-2:1 U
250000
133 OF
95 OF
Ambient
Narrative
-Temperature
Thallium
0.22
0.11
0.01
0.35E
TSS
16000
15
10
-
Vanadium
0.21
0.11
0.01
24E
FZiKc'- 00S
0:37
1018
Pow
67A
C=zarcmogen
A= acute criteria
E= EPA criteria
Duke has received 'permit inod'ihcati6ns at,several other plants for the•addition of''FGD systems.
Each of,those has received monthly flowmonitoring as well as weekly monitoring at an,mtemal
outfall (discharge to ash basin) for the following parameters:
• TSS 0 Chloride 0 Silver
• Arsenic 0 Mercury • Zinc
• Cadmium • Nickel
• Chromium 6 Selenium,
In addition, the following appear to be potential pollutants of concern at this facility and will also
be monitored:
• Beryllium
• COD

Permit
Outfall Month
Day Year Parameter Sample UoM
Value Cell Type
Loc
NC0004979
002
10
32006 01147 - Selenium, Ti,Grab
ug/I
2 7 DLYVALUE
Effluent
NCO064979
`002
10
1,7 2006 01147 - Selenium, Tcbrab
ugh
3 6, DLYVALUE
Effluent
NC0004979
002
11
7 2006 01147 - Selenium, To Grab
ug/I
5 DLYVALUE
Effluent
NC0004979'
002
11
20 2006 01147 - Selenium, To Grab
ug"/I
5 DLYVALUE
Effluent
NC0004979
002
12
5 2006 01147 - Selenium, To Grab
ug/I
57 DLYVALUE
Effluent
NC0004979
002
12
18 2006 01147 - Selenium, Ti Grab
ug/I
63 DLYVALUE
Effluent
,NC0004979
002
1,
2 2007 01147 - Selenium, T(Grab
ug/I
25 DLYVALUE
Effluent
NC0004979
002
f
16 2007 01147 -.Selenium, To Grab
ug/I
33 DLYVALUE
Effluent
NC0004979
002
2
6 2007'01147 - Selenium, To Grab
ug/I
32 DLYVALUE
Effluent
NC0004979
002
2
20 2007 011 a7 - Selenium, To Grab
ug/I
36 DLYVALUE
Effluent
NC0004979
002
3
6 2007 01147 - Selenium, To Grab
ug/I
44 DLYVALUE
Effluent
NC0004979
002
3
'20 2007 01147 - Selenium, T(Grab
ug/I
2.5 DLYVALUE
Effluent
NC0004979
002
4
3 2007 01147 - Selenium, To Grab
ug/I
4 9 DLYVALUE
Effluent
NC0004976
002
4
17 2007 01147 - Selenium, To Grab
ug/I
54 DLYVALUE
Effluent
NC0004979
002
5
1 2007 01147 - Selenium, To Grab
ug/I
43 DLYVALUE
Effluent
NC0004979
002
5
15 2007 01147 - Selenium, Ti,Grab
ug/I
6 DLYVALUE
Effluent
NC0004979
`002
6,
5 2007 01147 - Selenium, Ti Grab
ug/l
9 'DLYVALUE
Effluent
NC0004979
002
6
19 2007 01147 - Selenium, To Grab
ug/I
121 `DLYVALUE
Effluent
NC0004979
002
7
5 2007 01147 - Selenium, To Grab
ug/I
45 DLYVALUE
Effluent
NC0004979
002
7
17 2007 01147 - Selenium, To Grab
ug/I
5-2 DLYVALUE
Effluent
N00004979
002
8
7 2007 01147 - Selenium, T(Grab
ug/I
35 DLYVALUE
'Effluent
,NC0004979
002
8
21 2007 01147 - Selenium, Ti Grab
ug/I
3.9 DLYVALUE
Effluent
NC0004979
002
9
4 2007 01147 - Selenium, T(Grab
ug/I
48 DLYVALUE
Effluent
NC0004979
002
9
18 2007 01147 - Selenium, T(Grab
ug/I
61 DLYVALUE
Effluent
NC0004979
002
10
2 2007 01147 - Selenium, TuGrab
ug/I
48 DLYVALUE
Effluent
NC0004979
002
1,0
16 2007 01147 - Selenium, TiGrab
ug/I
4.1 DLYVALUE
Effluent
NC0004679
002
11
6 2007 01,147 - Selenium, To Grab
ug/I
57 DLYVALUE
Effluent
NC0004979
002
11
20 2007 01147 - Selenium, T(.Grab
ug/I
3.3 DLYVALUE
Effluent
NC0004979
002
12
4 2007 01147 - Selenium, To Grab
ug%I
5:7 DLYVALUE
Effluent
NC0004979
002
12
17 2007 01147'- Selenium, To Grab
ug/I
7.3 DLYVALUE
Effluent
NC0004979
002
1
2 2008 01147 -,Selenium, Ti Grab
ug/I
27 DLYVALUE>
Effluent
NC0004979
002
1
15 2008 011'147 - Selenium, T(Grab
ug/I
31 DLYVALUE
'Effluent
NC0004979
002
2
5 2008 01147 - Selenium, To Grab
ug%I
3.2 DLYVALUE
Effluent
NC0004979
002
2
19 2008 01147 - Selenium, T(Grab
ug/I
35 DLYVALUE
Effluent
NC000497,9
002
3
4 2008 01,147 - Selenium, To Grab
ug/I
45 DLYVALUE
Effluent
NC0004979
002
3
18, 2008 01147 - Selenium', To Grab
ug/I
5-2° DLYVALUE
'Effluent
NC0004979
002
4
1 2008 01147 - Selenium, T(Grab
ug/I
5,3 DLYVALUE
Effluent
NC0004979
002
4
15 2008 01147 - Selenium, To Grab
ug/I
4 2 DLYVALUE
Effluent
NC0004979
002
5
6 2008 01147 - Selenium, To Grab
ug/I
3 DLYVALUE
Effluent
NC0004979
002
5
20 2008 01147 - Selenium, To Grab
ug/I
3 7' DLYVALUE
Effluent
NC0004979
002
6
3 2008' 01'1'47 - Selenium, Ti Grab
ug/I
3,8 DLYVALUE
Effluent
NC0004979
002
6
17 2008 01147 - Selenium, To Grab
ug/I
61 DLYVALUE
Effluent
NC0004979
002
7
1 2008 01147 - Selenium, Ti Grab
ug/I
91 DLYVALUE
Effluent
NC0004979
002
7
16 2008 01147 - Selenium, TvGrab
ug/I
44 DLYVALUE
Effluent
NC0004979
002
8
5 2008 01147- Selenium, To Grab
ug/I
59 DLYVALUE
Effluent
NC0004979
002
8
19 2008'01147 - Selenium, Ti Grab
ug/I
29 DLYVALUE
Effluent
NC0004979
002
9
2 2008 01147 - Selenium, T(.Grab
ug/I
48 DLYVALUE
Effluent
NC0004979
002
9
16 2008 01147 - Selenium, To Grab
ug/I
41 DLYVALUE
Effluent
NC0004979
002
10
7 2008 01147 - Selenium, To Grab
ug/I
2.4' DLYVALUE
Effluent
NC0004979
002
10
27 2008 011.47 - Selenium, To Grab
ug/I.
2,9 DLYVALUE
,Effluent

N00004979
002
11
6 2008 01147 - Selenium, T(Grab
ug/I
2.8 DLYVALUE
Effluent ,
Permit
Outfall Month
Day Year Parameter Sample UoM
Value Cell Type
Loc
NC0004979
002
1'1
18 2008 01147 - Selenium, Ti Grab
ug/I
4.5 DLYVALUE
Effluent
NC0004979
002
12
2 2008 01147 - Selenium, T(Gr2b
iig/l
2 6 DLYVALUE
Effluent
NC0004979
002
12
16 2008 01 147 - Selenium, Ti Grab
ug/I
2 9 DLYVALUE
Effluent

K-P

PkDuke
®Energy®
Carolinas
January 19, 2009
Ms Toya Fields
State of North Carolina
Department of Environment and Natural Resources
Division of Water Qdaiity
NPDES Unit
1617 Mad Service Center
Raleigh, North Carolina 27699-1646
DUKE ENERGY CAROLINAS
ALLEN STEAM STATION/ 253 Plant Allen Rd
Belmont, NC 28012
704 829-2423
704 829-2370 fax
Subject Duke Energy Carolinas, LLC — NPDES Permit Modification
Allen Steam Station - #NC0.004979
Dear Ms Fields
JAN 2 3 2009
Duke Energy requests the, NPDES permit for Allen Steam Station be modified to eliminate the selenium limit'for Outfall
002 (Ash Pond Effluent) A summary of the 2006 — 2008 historical selenium data is attached for your review
Additionally, a dry ash'handlmg system should be operational, in June of this year, which should significantly lower
selenium concentrations in the ash pond
Also,attached is a check (#0001138843) in the amount of $1,030 as required for a mayor NPDES permit modification
Thank .you tin advance for your assistance on this matter Should you have questions regarding this application, ,please
contact Allen Stowe at [phone]
Sincerely,
Stephen Immel
General Manager II
Allen Steam Station

Allen Steam Station
Selenium Results (2006 - 2008)
Outfall 002 (Ash Pond Effluent)
XIw
blehou" N",
&
Q
1/3/2006
5.8
01/02/08
2.7
1/17/2006
3.3
01/15/08
3.1
2/7/2006
4.8
02/05/08
3.2
2/21/2006
7.1
X2/20%20074` AKII., US -V�Q
02/19/08
3.5
3/7i2606
5.2
03/04/08
4.5
3/21/2006
4.3
019.7
03/19/08
5.2
4/4/2006
4.1
04/01
5.3
4/18/2006
4.2
04/15/08
4.2
5/212066
4A
05/06/08
3.0
5/16/2006
2.4
0". O -'%,A',5 -XO ZWO
05/20/08
:5.7
6/6/2006
4.6
,0fi1O V
06/03/08
3.8
6/20/2006
2.506%19/07
1Y2j�
06/1'7/08
6.1
7/5/2006
4.2
NJ A
k 4,15
07/01/08
9.1
7/18/2006
4.6
KK
07/15/08
4.4
8/1/2006
T0.1
X
08/05/08
5.9
8/15/2006
7.4
4
K
08/19/08
2.9
9/5/2006
5.6
09/02/08
4.8
9/19/2606
4.69
J'6-21
09/1,6/08
4.1
10/3/2006
2.7
HAMM 48u
1,0/07/08
2.4
16/17/2006
3.6
10/27/08
2.9
11/7/2006
5.0
11/06/08
11/20/2006
5.,0
11 /18/ 08
-2.8
4.5
12/5/2006
5.7
wmm�, wae
12/2/2008
2.6
112/18/20 6
9.3
1,
12/16/2008
2.9
3 2009