NC0004979_Wasteload Allocation_19940819

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NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0004979
PERNVH= NAME. Duke Power Company
FACILITY NAME: Plant Allen
Facility Status: Existing
Permit Status: Renewal
Major Minor
Pipe No.: 001
Design Capacity:
Domestic (% of Flow): D• D "�
Industrial, (% of Flow): / DO- o °Lo
Comments: ONCE Tlf2ovC�tf 6vD�-��-� L�oL�`�i wAt��
Nd AIi�Lr-��1 vF GN�2�r_ oe f3zoc:-aEs T)4•��'S P�� .
AGK. 11 7/z
RECEIVING STREAM: 5nan4 Fv� C4-rAWb4 Zzvt; 2
Class: tV 5 - V
Sub -Basin: - 03-05-3(-
Reference
3-05-3(Reference USGS Quad: «1A146 (please attach)
County. Gaston
Regional Office: Mooresville Regional Office
Previous Exp. Date: 00/00/00 Treatment Plant Class:
Classification changes within three miles: No,4E
P LOO ED
Renuestedby: Sean G ris Date. 8/18/94 /9
Prepared by: �, �_ Date: v 9
Reviewed y: UARVYV Date:
ModelerDate
Rec.
I #
� Mn/
g `!
O
,
Drainage Area (mi z ) 6SS Avg. Streamflow (cfs): TO �,
7Q10 (cfs) /,?�- Winter 7Q10 (cfs) 227 30Q2 (cfs) 31Tp
Toxicity Limits: IWC % Acute/Chronic
Instream Monitoring:
Parameters
Upstream
Location
Downstream Location
Effluent
Characteristics
Summer
Winter
BODS (mg/1)
ISM-N(mg/1)
D.O. (mg/1)
TSS (mg/l)
F. Col. (/100 ml)
pH (SU)
fir°.9dCr.
A4. 40Y
ell, A14
Z3
Comments: 64c4- _A�w
ri,rJc.'� CAA
y,

t (©®2\ \\
0

FOR APPROPi.IATE DISCHARGERS, LIST COMPLETE GUIDELINE LIMITATIONS BELOW

P `12-1994
a
15:10 FROM .'DEM WATER Q04LTTY SECTION TO
Facility Nom:
NPDES No.:
Type of Waste:
Facility Status:
Permit Status:
Receiving Stream:
stream Classification:
Subbasin:
Regional Me:
Reque nw.
Date of Request:
TWO Quad:
Q .
FACT sII wr FOR. WAsTELoAi) ALLO ATION
Duke Power Co - Plant Allen
NC0004979
Industrial - 100%
Existing
Renewal
south Fork Catawba River
WS -V
030836
Gaston
Mooresville'
Goris
8/19/94
G14NE
W
MRO P. 02/19
7990
TJSGS #
Daps:
Draimp Area (mi2):
summon 7Q10 (cis):
Winter 7010 (cfs):
Average Flow (cfs):
302 (cfs):
IWC M:
635
124
227
806
309
'V;
,�'aqselcz.d Allocation Summary
(,-,,B roach taken, correspondence with region, EPA, etc.)
Lr,,js,,ba a from this outfall is condenser coaling water (noncontact) that rear es heat xeje 1 Loo.
irecondensers and other heat exchangers. Will, recommend renewal of 't Ia r, c.'asting
and the addition of a free available chlorine limit per effluent guidelines (40 CFR 4,23.13).
Sper,ial Schedule Requirements and additional comments from Reviewers:
10/11/94
Reviewed by U � / �.• .
Insmm Assessment:✓ Jbate: b
Regional Supervisor.
�/�/�.a
PellWts & Engineering:—� :—�0 �27/j-1
� . � f �_11 WTU Pt

Type of Toxicity Test:
Existing Limit:
Recommended Limit:
Monitoring Schedule:
Existing Limits
Flow (MGD):
Temperature (C/F):
Temperature (C/F):
Recommended Limits
2
TOXICS/METALS/CONVENTIONAL PARAMETERS
NA
NA
NA
NA
Monthly Avg.
NO LIMIT
35/95
38.9/102 ( June 1 -
September 30)
Monthly Average Daily Max. WQ or EL
Flow (MGD): go 'I'm s -[—
Temperature (C/F): 35/95
Temperature (C/F): 38.9/102 ( June 1 -
September 30)
Free Available Chlorine (mg/1): 0.2 0.5 EL
** Chlorination of the once -through cooling water is not allowed under this permit. Should Duke Pwer wish to
chlorinate its once through cooling water, a permit modification must be requested and received prior to commencing
chlorine.
Limits Changes Due To:
Change in 7Q10 data
Change in stream classification
Relocation of discharge
Change in wasteflow
New pretreatment information
Other (onsite toxicity study, interaction, etc.)
Free Available Chlorine
- Parameter(s) are water quality limited. For some parameters, the available load capacity of the immediate
receiving water will be consumed. This may affect future water quality based effluent limitations for additional
dischargers within this portion of the watershed.
OR
X_ No parameters are water quality limited, but this discharge may affect future allocations.
qa
r

INSTREAM MONITORING REQUIREMENTS
Upstream Location:
Downstream Location:
Parameters:
Special instream monitoring locations or monitoring frequencies:
MISC EI IANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.
1
'
3
INSTREAM MONITORING REQUIREMENTS
Upstream Location:
Downstream Location:
Parameters:
Special instream monitoring locations or monitoring frequencies:
MISC EI IANEOUS INFORMATION & SPECIAL CONDITIONS
Adequacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

t • ! <^ �
1

St6te of North Cdrolirid
Department of Environment,
Health and Natural Resources
James B. Hunt, Jr., Governor
Jonothon B. Howes, Secretary
Steven J. Levitos, Deputy Secretory
4XX
�FA
[DEHNFz1
Division _of Environmental Management
Water Quality Section
P.O. Box 29535
Raleigh, N.C. 27626-0535
FAX:[phone]
FROM: rCw _J�ayl d SVS �v�
PHONE: [phone]
I NO. OF PAGES INCLUDING THIS SHEET: I "/ 1
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An Eaux Opportunity Affirmative Action Employer

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0004979
PERMITTEE NAME; Duke Power Company
FACILITY NAME: Plant Allen
Facility Status: _Existing
Permit Status: Renewal
Major -4 Minor
Pipe No.: 6M 610 z_
Design Capacity: fl. 6 M C7 D
Domestic (% of Flow): 0.05 TV
Industrial (% of Flow): 99. f5 26
Comments: 5456 Q--7-rskrC--& Apr- D65c?zP7-z ,, J of Llsscj"zc
RECEIVING STREAM. C-4TAWSA P_r a e_
Class: W5 - t V 3 GA
Sub -Basin: - 0309 3
Reference USGS Quad: C-7 I q Al E (please attach)
County- Gaston
Regional Office: Mooresville Regional Office
Previous Exp. Date: 00/00/00 Treatment Plant Class:
Classification changes within three miles: Ama
Requested by: Sean Goris
Prepared by: - A.
Reviewed by:
Date: 8/18/94
Date:
Date: 4 �dw
-10 P-5-1
Modeler Date Rec. #
fM'`l 8l 9 r1
Drainage Area (mit) Avg. Streamflow (cfs):
7Q10 (cfs) Winter 7Q10 (cfs) 30Q2 (cfs)
Toxicity Limits: IWC _ % Acu hronic
Instream Monitoring:
Parameters
Upstream
Location
r.
Downstream Location
Characteristics
TSS (MA:
Oil & cheese (mg/1):
Total Capper (mg/1):
TOW bm (mg/I):
Amr& WY
seleaiam (itg/1):
Total Phosphorus (mgft
Total Nitmgen (mgli):
30
100
EL
15
20
EL
1
1
EL
1
1
EL
314
WQ
31
WQ
Qttrly monitoring
Qrtrly monitoring
Toluene 41g/1) hnoni
MTBE QW) mQnitating
pH (SU)
7 s w Ii -
Comments:

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FOR APPROPRIATE DISCHARGERS, LIST COMPLETE GUIDELINE LiMITATIO
NS BELOW
Type of Product Produced I Lb*/Day Produced
I L A�4 .i
Effluent Guideline Reference
�� c,Fk 1/Z3. /z

,✓y' -%DGT1-12-1991 15:11 FROM
., DEM LJATtR QUALITY SECTIOhI
TO
MRO
FACT Ste' FOR'WASTELOAD ALLCCAnON
Reqwst # 7991
Facility Name:
Duke Power Co - Plant Allen
Outfall, 002
NPDES No,:
NCO004979
Type of Waste:
Industrial - 99.95% - Domestic 0.05%
Facility Status:
Existing
Permit Status:
Renewal
Receiving Stream:
Catawba River
Strem Classification:
wS-1V & B CA
Subbasin:
030$34
County:
Gaston
Sagamflanaamrisdro
Regional Office:
Mooresville f ��
USOS #
±'Request~
Goris
8/19/94
Date:
Drainage Area (mi2):
2010
G 14NE
Sumnwr 7Q10 (cfs),
95*
Winter 7Q10 (cfs):
95*
Aveiage Ficr,�; (cfs):
-15*
30Q2 (cfs):
IWC (%):
16
Wasteload Allocation Summary
(approach taken, correspondence with region, EPA, etc.)
Ash basin discharge with sanitary waste, groundwater remediation and stormwater Hovis.
Recommend renewal of existing NPDES pemt limits w/ toxicity test requirem-ont.
recommend additional monitoring for BODS, fecal coliform (domestic wastewatc .,,
toluene and 1V OE for the groundwater remediation project.
.Qr•hwrirnli- 2PnnirP.rrPntc and addition] mt iTents front ReVieWMS:
israr Assessment:
cr.
-Dz:: ;:1 "�`/118n..s._-
'Unal SupervISM ��('� -IdGt W�-G�. In d DaCc- /,/ `%_ -it
-;
P. 05/19

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• 1

3
INSTREAM MONITORING REQUIREMENTS
Upstream Location:
Downstream Location:
Parameters:
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
AAd .quacy of Existing Treatment
Has the facility demonstrated the ability to meet the proposed new limits with existing treatment
facilities? Yes No
If no, which parameters cannot be met?
Would a "phasing in" of the new limits be appropriate? Yes No
If yes, please provide a schedule (and basis for that schedule) with the regional
office recommendations:
If no, why not?
Special Instructions or Conditions
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

Facility Name Duke Power Plant Allen Permit # NC0004979 — Pipe # 002
CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit chronic toxicity using test procedures outlined in:
1.) The North Carolina Ceriodaphnia chronic effluent bioassay procedure (North Carolina Chronic Bioassay
Procedure - Revised *September 1989) or subsequent versions.
The effluent concentration at which there may be no observable inhibition of reproduction or significant mortality
is _16_% (defined as treatment two in the North Carolina procedure document). The permit holder shall
perform Quarterly monitoring using this procedure to establish compliance with the permit condition. The first
test will be performed after thirty days from the effective date of this permit during the months of
_ JAN APR JUL OCT .. Effluent sampling for this testing shall be performed at the NPDES
permitted final effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR -1) for the month in which it was performed, using the parameter code TGP3B.
Additionally, DEM Form AT -1 (original) is to be sent to the -following address:
Attention: Environmental Sciences Branch
North Carolina Division of
Environmental Management
4401 Reedy Creek Road
Raleigh, N.C. 27607
Test data shall be complete and accurate and include all supporting chemical/physical measurements performed in
association with the toxicity tests, as well as all dose/response data. Total residual chlorine of the effluent toxicity
sample must be measured and reported if chlorine is employed for disinfection of the waste stream.
Should any single quarterly monitoring indicate a failure to meet specified limits, then monthly monitoring will
begin immediately until such time that a single test is passed. Upon passing, this monthly test requirement will
revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of
Environmental Management indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival and appropriate environmental controls, shall constitute an invalid test and will require immediate
retesting(within 30 days of initial monitoring event). Failure to submit suitable test results will constitute.
noncompliance with monitoring requirements.
7Q10 95 cfs
Permitted Flow 11.6_ MGD
IWC 16 %
Basin & Sub -basin CTB34
Receiving Stream Catawba River
County Gaston
QCL PIF Version 9191
Arr
mended by.
10/11/94

t• r

DUKE POWER -ALLEN PLANT 9/27/94
SOUTH FORK CATAWBA RIVER/CATAWBA RIVER JMN.
030834 & 030836
WLA#S 7990,7991,7992,7993,7994
The facility is requesting renewal of existing NPDES permit. Power plant has five outfalls,
but has previously only had limits for outfalls 001 & 002. Outfalls 003, 004 & 005 have
not had permit limits before.
001 & 003 discharge to the South Fork Catawba River (030836).
002, 004 & 005 discharge to the Catawba River approximately 5 miles above Lake Wylie
(030834).
Outfall descriptions
QU - Condenser Cooling Water is once through, non contact cooling water that removes
heat rejected from the condensers and other selected heat exchangers. Avg now 428.5
MGD. Max. flow 784.8 MGD.
002 - Ash basin discharge with sanitary waste and stormwater flows. Accomodates flows
from the yard drainage sump,coal yard sump, ash removal lines and rainfall runoff from
the basin watershed area. Avg. flow 11.6 MGD.
003 - Once -through non contact cooling water withdrawn from the service water system.
the discharge consists of cooling water from Units 4&5 mill oil coolers, boiler feedpump
hydraulic coolers and other miscellaneous equipment cooling .
004 - Equipment Cooling ater The discharge consists of cooling water from Units 1&2
mill oil coolers, boiler feedpump hydraulic coolers and other miscellaneous equipment.
Once -through non contact cooling water withdrawn from the service water system. In
addition water from a vehicle rinse -down area is directed to this outfall. The rinse water
contains no soaps or other additives.
045 -- Water for the Unit 5 Condenser Cooling Water is filtered for Asiatic clams. These
clams, common in Lake Wylie can clog the condenser tubes. Max. flow of 3000 GPD. No
other additives are in the backwash water.
Outfall 001- In new WLA, effluent guidelines recommend free available chlorine at 0.2
mg/1 Mo. avg. and 0.5 mg/1 Da. Max. 40 CFR 423.13. Previous Limits include flow and
temperature w/ a monthly average of 35C (95F). During the period from June 1 to
September 30, 38.9 C (102 F) is allowed. No chlorination of the once -through cooling
water is allowed under this permit. Will recommend that free available chlorine limit be
added to renewed permit.
Outfall 002 -Ash Basin discharge
Effluent guidelines recommended include:
Mo. Avg.
Da. Max.
TSS 30 mg/1
100 mg/1
O & G 15 mg/1
20.0 mg/1 -
Total Copper 1.0 mg/1
1.0 mg/1
Total Iron 1.0 mg/1
1.0 mg/1\
Previous permit had these limits and additional limits of 450 µg/1 of arsenic and 45. µg/1 of
selenium. Tox limit of 11%. in JAN.APR,JUL, OCT.

k t4

DUKE POWER -ALLEN PLANT
Page 2
In May 1994, IAU responded to Duke Power request to add GW remediation discharge to
the ash basin. Indicated that oil/water separator would be installed for treatment. We
recommended that limits and monitoring requirements for benzene, toluene and MTBE
would have to be added to the permit. A review of the current system does not show a
oil/water separator added as a treatment system. Staff report indicates that upon reissuance
of Permit, action will be taken on ATC for construction of oil/water separator.
New Allowable concentrations for 002
Arsenic= old limit = 450 µg/l. After new wasteflow, from 7.6 MGD to 11.6 MGD,
allowable concentration = 314 µg/1

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NC0004979
PERMITTEE NAME: Duke Power Company
FACILITY NAME: Plant Allen
Facility Status: Existing
Permit Status: Renewal
Major Minor
Pipe No.: M 003
Design Capacity:
Domestic (% of Flow): o
Industrial (% of Flow): 100. �n
Comments: o&,C rawuh N Noy(- tM r46r 6001VUh 14z�o
40 IzMu5 v� �9��rn�r,.tc, ► vLec"•+ rs ZAl PazvrPa$
Pce"rre
RECEIVING STREAM: "�)'Ov"r4 Rel— 'G4rA-W13A Pr.�u—
Class:
Sub -Basin: - 03 OS 36
Reference USGS Quad: ' 61 L( NE (please attach)
County. Gaston
Regional Office: Mooresville Regional Office
Previous Exp. Date: 00/00/00 Treatment Plant Class:
Classification changes within three miles: 1\10 kiE
Requested by: Sean Goris Date 8/18/94
Prepared by: Date: (a ( f
Reviewed y.§±ao Date: ld C/
_ c
Modeler
Date Rec.
#
BODS (mg/1)
Drainage Area (mi ) 6 3s Avg. Streamflow (cfs): 30b
7Q10 (cfs) /2f Winter 7Q10 (cfs) zz7 30Q2 (cfs)3�
Toxicity Limits: IWC % Acute/Chronic
Instream Monitoring:
Parameters
Upstream
Location
Downstream Location
Effluent
Characteristics
Summer
Winter
BODS (mg/1)
NH3-N(mg/1)
D.O. (mg/1)
TSS (mg/1)
F. Col. (/100 ml)
pH (SU)
r/ii i��r�7/� Gllm/i✓<-
O. L M j.Q
O.S .N l.Q 6, G
Comments:
C -

FOR APPROPRIATE DISCHARGERS, LIST COMPLETE GUIDELINE LIMITATIONS BELOW

15:12 FROM DEM WHTER QUALITY SECTION TO
Fadlity Paan:
NMES No.:
Type of Waste:
Fac&y Status:
Permit Status:
Receiving
Stream Classification:
Suhlasin:
cam:
Regional Office:
RequWor:
Date of Request:
TWo Quad:
Request ,# 7992
Duke Power Co - Plant Allen Outfalf003
NCO004979
Industrial - 100%
Muisting
Renewal rk6:� Cm&w
South Fork Catawba River
CJS -V
030836
Gaston LP
mimeo
Doris
8/104
G 14NE
V P+
USGS #
Date:
Drainage Am (mi2):
Suter7Q10 (cfs):
Minter 7QIO (cfs):
Averap Flow (cfs):
30Q2 (cfs):
IWC (%),
MRO
�3
124
227
806
309
P. 09/19
Wasteload Ail .tion Suzrmiary
(approach taken, correspondence with region, F -PA, etc.)
Facility requesting perrdt for discharge, once -through noncontact cooling water Faith&UMM h`sL-,
the service water system.
,special Schedule Requirements and additional comments from Reviewers:
Recommended by:_ --
Reviewed by
�/
Instream Assess :nt
Regional Supervipm, _ _ �'� Cl y , lam: /0/iY/9�f _
R,H 14 N, tl TO 1E0.,r4 MNI5.,. , e � ��f n�a : S �6 L Y:

c ~ • a � 4 Y ,
2
TOXICS/METALS/CONVENTIONAL PARAMETERS
Type of Toxicity Test: NA
Existing Limit: NA
Recommended Limit: NA
Monitoring Schedule: NA
Recommended Limits
Monthly Avg. Daily Max. WQ or EL
Wasteflow (MGD): 6.3
Free Available Chlorine (mg/1): 0.2 0.5 EL
Parameter(s) are water quality limited For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
OR
X_ No parameters are water quality limited, but this discharge may affect future allocations.

INSTREAM MONITORING REQUIREMENTS
Upstream Location:
Downstream Location:
Parameters:
Special instream monitoring locations or monitoring frequencies:
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Special Instructions or Conditions
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

NPDES WASTE LOAD ALLOCATION
PERMIT NO.: NCO004979
PERMITTEE NAME:
FACILITY NAME:
Duke Power Company
Plant Allen
Facility Status: Existing
Permit Status: Renewal
Major Minor
Pipe No.: rd�S/
Design Capacity: 8.01 #M h I>
Domestic (% of Flow): D. o
Industrial (% of Flow): /pp,v�lo
Comments: ONU= T-ft"OL5# Moi-- lhwt�� too&ZN 6
;GI cW bP_s 11zv Frt.µ 1 u,t-, SSE - DVW X( Ate ,
APPiXtA-rzoM Al, rXTE2yL4Zr'rE-1T No LZN4u-5
ol? MogtLrnqzCA16, l:�Qvti r�st�5 rN Far-L1T4vs pEeM�
RECEIVING STREAM: CA MWW te�E2
Class: t✓s - Lc/ f $ GA
Sub -Basin: -
Reference USGS Quad: 67 y NE (please attach)
County: Gaston
Regional Office: Mooresville Regional Office
Previous Exp. Date: 00/00/00 Treatment Plant Class:
Classification changes within three miles: t4ONC-
Requested by: Sean Goris Date: 8/18/94
Prepared by: �'], Date:
Reviewed y: Date:
E—LOIL
ModelerDate
Rec.
#
,:__Ai✓
8 /9w13
Drainage Area (mit) �111° Avg. Streamflow (cfs): Tse
7Q10 (cfs) y% s Winter 7Q10 (cfs) 45_r_ 30Q2 (cfs)
T MIS✓/M way n11*'1(_ T 115 C&
Toxicity Limits: IWC % Acute/Chronic
Instream Monitoring:
Parameters
Upstream
Location
Downstream Location
Effluent
Characteristics
Summer
Winter
BODS (mg/1)
NH-N(mg/1)
D.O. (mg/1)
TSS (mg/1)
F. Col. (/100 ml)
pH (SU)
/�LL1N4/l /` �'1/a�,Na
O.Zist l�
O Srarl� (e-0
Oil
2o
Comments:

f ,u'
J

FOR APPROPRIATE DISCHARGERS. LIST COMPLETE GUIDELINE LIMITATIONS BELOW

O -C -T-12-1994 ,
15:13 FROM -.I5EM WAFER QURL I T'Y SECTION TO
]Duke Fower Co - Plant Allen
NC0004979
Industrial -100%
Existing
Renewal
Catawba liver
WS -IV & B CA
030834
Gaston
Moaresville'��
Goris
8/18194
G14NE
■M
MRO P. 12/19
USGS #
Dale:
Draiwge A= (nii 2):
201,0
Sunoanff 7Q10 (cfs):
95*
Wing 7Q10 (cfs):
W'
Avewe Flow (cfs):
95#
3OQ2 (cfs):
IWC (%):
Wasteload A110(2tiOn Sutxtnaary
(mach taken, correspondence with region, BPA, etc.)
Facility requesting Permit for discharge once -through imonc ontact cooling water withdrawn
the service waux systems,, Water from a. vehicle rinse -dawn ueea is directed to this out- P,
rinse water contains no soaps or other additives.
Special. Schedule Requirements and additional comments firom Review :
i� by.
Reviewed by
In5tre= Assessment:y
Re Tonal ��p i ?I— � . ,� Cl�� �, rare: /d�/ /� f
Per .ts & Entering: _—Date.LOUPA

2
TOXICS/METALS/CONVENTIONAL PARAMETERS
Type of Toxicity Test: NA
Existing Limit: NA
Recommended Limit: NA
Monitoring Schedule: NA
Recommended Limits
Monthly Avg.
Wasteflow (MGD): 8.01
Free Available Chlorine (mg/1): 0.2
OR & Grease (mg/1): 15
Daily Max. WQ or EL
0.5 EL - yoeFR L1a3. B
20 - OQ - V i A5 1 4vuCKA
Parameter(s) are water quality limited For some parameters, the available load capacity of
the immediate receiving water will be consumed. This may affect future water quality based
effluent limitations for additional dischargers within this portion of the watershed.
NO
X_ No parameters are water quality limited, but this discharge may affect future allocations.

INSTREAM MONITORING REQUIREMENTS
Upstream Location:
Downstream Location:
Parameters:
Special instream monitoring locations or monitoring frequencies;
MISCELLANEOUS INFORMATION & SPECIAL CONDITIONS
Wasteload sent to EPA? (Major) (Y or N)
(If yes, then attach schematic, toxics spreadsheet, copy of model, or, if not modeled, then old
assumptions that were made, and description of how it fits into basinwide plan)
Additional Information attached? (Y or N) If yes, explain with attachments.

PERMIT NO.: NC0004979
NPDES WASTE L
PERMITTEE NAME. Duke Power Company
FACILITY NAME: Plant Allen
Facility Status: Existing
Permit Status: Renewal
Major Minor
Pipe No.: 9ffpDoS
Design Capacity: O. / S M61>
Domestic (% of Flow): 0. O to
Industrial (% of Flow): /00. 0 Qo
Comments: 8,qC& t M q 6F.6
40 tZkAzr 5 Pa- MOM LTD9.CAX) P -a &0r eEA4&1Q t5 r1 -I PZa UCOaS
FEzt r rr
RECEIVING STREAM: ' GC,4�,40 �A- �� t, �✓
Class: (,JS- Z✓ £ ig CA
Sub -Basin:
Reference USGS Quad: (please attach)
County. Gaston
Regional Office Mooresville Regional Office
Previous Exp. Date: 00/00/00 Treatment Plant Class:
Classification changes within three miles:
Requested by: Sean Gods Date: 8/18/94
Prepared by:
Date:
Reviewed by: Date:
,E�� l //o
t ofn 17-
AD ALLOCATION
Modeler Date Rec. #
I -^W q
Drainage Area (mit ) Avg. Streamflow (cfs):
7Q10 (cfs) Winter 7Q10 (cfs) 30Q2 (cfs)
Toxicity Limits: IWC % Acute/Chronic
Instream Monitoring:
Parameters
Upstream Location
Downstream Location
Effluent
Characteristics
Summer
Winter
BODS (mg/1)
NH-N(mg/1)
D.O. (mg/1)
-/f L
TSS (mg/1)
F. Col. (/100 ml)
smuiL)
P(L
pH (SU)
;L�
_V_J
Comments: z� -2 1� �r J

Page 1
r
Note for. Jackie Nowell
From: Jackie Nowell
Date: Tue, Oct 11, 1994 4:12 PM
Subject: duke power - allen plant -005
To: Sean Goris
I called Mike Parker of MRO and he said that in his opinion this outfall (005) should not be
included in the permit, "there is no treatment, it's not wastewater, what parameters could we
permit or monitor"?. He said he told Duke Power when he inspected the facility that he was
going to recommend deletion of 005 from the permit. He said it was mainly listed by Duke
because the backwash is discharged to the Catawba River.. So, I will not be including it in,
the factsheet packages.
Also, Mike said that when you draft the correspondence for final permit please include
comment that staff reviewed outfall 005 and determined that including it in the permit was not
necessary. (or however you can skillfully word it.)

Page Four
PART IV - EVALUATION,AND RECOMMENDATIONS
The permittee requests renewal of the subject Permit, which
also includes a request to modify the Permit to include an
additional waste stream (decontaminated GW) to be discharged at
outfall 002. Approval for the addition of this waste stream to
the Permit is recommended -pending the TSB's review and
concurrence of this request._A previously submitted. ATC request
(along with regional recommendations) for the construction of the
oil/water separator is awaiting reissuance of the modified NPDES
Permit before action can be taken.
The permittee also noted the existence of a previously
unpermi-tted outfall (005 -Asiatic clam filter backwash), however,
it is the opinion of this Office that the. discharge from this
outfall is not considered "wastewater" and, therefore, should not
be included in the Permit.
Pending a review and approval of the WLA, it is recommended
that the Permit be renewed as requested.
Signature of Report Preparer Date
Water Quality Reg nal Supervisor
Date

., 4

31
a
496, 213011 4971�;.W J�NiE RgiA �E 85 499, 11 JPO 000 FEET (N.C.)
v N I
•
n X11650 /1
9
c
10 ll
T'
56
10
-fX pP�'.
193
I aiiings.Pond
p;
V,
q _ � � ;] jl l �i �( /r +' _55
U
992 Q),
Y
(1-1Z)
682
j
of
o
Lower Ar' wrong
Fid
SCALE 1:24000
2 0
1 MILE
1000 0 1000 2000 3000 4000 5000 6000 7000 FEET
9-1-
7� 1 .5 0 1 KILOMETRE
CONTOUR INTERVAL 10 FEET _- \1
FIGURE USGS TOPOGRAPHIC MAP OF THE AREA
AROUND ALLEN STEAM STATION.
MN
GN
4Jh*
80 MILS 0*02'
1 , MIL

DUKE POWER COMPANY I
ALLEN STEAM STATION
D I S C H A R G E P O I N T S
DISCFNRC£ NO. S 0 U R C E
L E G E N D
001 CCW DISCHARGE
002 ASN BASIN DISCHARGE
_ PLANT DRAINAGE
007 F.P.. HATER •1 AND •2 HYDRAULIC
DISCHARGE DINTS
N P D E S DISCHARGE POINTS
COUPLING & MILL COOLING WATER
004 •3-5 NYORALI
UC COUPLING ANO MILL
CDOLING WATER

Please print or type in the unshaded areas only. I N V UUU41 / `1
-rI"--a V.,I,IIV.4.7V1-ae
U.S. ENVIRONMENTAL -PROTECTION• AGENCY _
FORM � .... .: . .. ..,�.,.,.
�` APPLICATION FOR'PERMIT'TO. DISCHARGE WASTEWATER
��E PA EXISTING MANUFACTURING COMMERCIAL, -MINING AND SILVICULTURAL OPERATIONS. "_ .
NPOEs Cotisolidaied 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 receiving water.
NUMB ER
list
B. LATITUDE C. LONGITUDE
_ .
_ D. RECEIVING,WATER (name •.
1. OKO.
f. YIN.
a. ■KC. 1.090.
A. MIN.
). ■it
001
35
11
23 81
00
44
South Fork
002
35
10
25 81
00
44
Catawba River
*003
35
11
23 81
00
44
South Fork
*004
35
11
23 81
-00
44
Catawba River
*005
35
11
23 81
00
44
Catawba River
11. FLOWS, SOURCES OF POLLUTION, AND TREATMENT TECHNOLOGIES
A. Attach a line drawing showing the water flowthrough the facility. Indicate sources of intake water, operations contributing wastewater to the effluent,
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 between intakes, operations, treatment units, and outfalls. If a water balance cannot. be determined (&g., for certain mining acdvides/, provide e
pictorial description of the nature and amount of any sources of water and. any collec lowor f feetment rrieewres.
a. 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;`gnd (3) -The treatment received by the wastewater. Continue
on additional sheets if necessary. <a`:
L OUT -
OPERATIONS) cON,TRjou-nNG FLOW
: ts�'.;'Y:` e'`.: ':-' "'' 3. TREATMENT -
PALLN
(list)
a. OPERATION (lire) • ,
b.
b. AVERAGE FLOW
(include units)
c':.a• DESCRIPTION
..LIST. CODES FROM
TABLE 2C-1
once -through cooling
428.5 -MGD
Discharge to surface water
4-A
.(78.4.8: MGD
001
max.)
Ash basin discharge
--11.6 MGD
Chemical coagulation;
2-D
with sanitary wastes
Sedimentation;
I -U
002
and stormwater flows
Neut./Ion Exchange;
2-J
2-K
Discharge to surface water
4-A
Misc. once -through,
6.3 MGD
Discharge to surface water
4-A
non -contact -cooling water
*003
Misc. once -through,
8.01 MGD
Discharge to surface water
4-A
*004
non -contact cooling water;
(Intermittent)
intake screen and debris
filter backwash
Asiatic clam filter
0.18 MGD
Discharge to surface water
4-A
*005
backwash
(Intermittent)
For Identification Purpos
s Only
OFFICIAL USE ONLY (effluent guidelines sub -categories)

Plant Allen, Gaston County
NPDES # NC0004979
May 20, 1994
General Information
Plant Allen utilizes water from the Catawba River for condenser cooling and service
water requirements. A schematic flow diagram of water use and discharges indicating
typical (average)- flow rates for individual waste streams at Plant Allen is attached. A
brief discussion of each discharge follows. All flows are based on historical data where
possible or pump design capacities and normal run-times..
Discharge 001- Condenser Cooling Water (CCW)
Condenser Cooling Water
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 5
units at Plant Allen has two condenser cooling pumps. The number of pumps used is
dependent on unit load and intake temperatures with more pumps running with higher
loads and intake temperatures.
Units 1 and 2 share a common cooling water supply tunnel served by a total of 4 CCW
pumps. Units 3 and 4 also share a tunnel and 4 CCW pumps. Unit 5 has a separate
tunnel and 2 CCW pumps. The common tunnel design enables three pumps to give
Units 1 and 2 or 3 and 4 the equivalent of 1 1/2 pump operation. The 1 1/2 pumps
operation adds an economical range or flexibility when units are on partial load and
when intake water temperatures are minimal.
CONDENSER COOLING WATER PUMP CAPACITY
UNIT # 1 -PUMP GPM
1
55,500
2
55,500
3
83,000
4
83,000
5
83,000
1.5 -PUMP GPM
74,800
74,800
111,200
111,200
2 -PUMPS GPM
83,500
83,500
126,000
126,000
126, 000
MAXIMUM COOLING WATER FLOW 545,000 GPM
All condenser tubes at Plant Allen are cleaned manually with metal or rubber plugs.
Mechanical cleaning is required once a year for most units. Chlorine or other biocides
are not used.
Discharge 002 - Ash Basin
Storm Water run-off
The ash basin a Plant Allen accommodates flows from the yard drainage sump, coal

Plant Allen, Gaston County
NPDES # NC0004979
May 20, 1994
yard sump, ash removal lines and rainfall run-off from the basin watershed area. The
average rainfall run-off flows. are based on 47 inches of rain per year with 100% run-off
from pond surfaces and 50% run-off from other areas. - The average run-off for the ash
basin watershed area is 0.57 MD. Average run-off to the yard drainage sump is
calculated to be 0.018 MGD.
The normal rainfall run-off plus ground water seepage from the coal pile area is routed
to the coal yard sump via the coal handling"sumps. Perforated pipes beneath the coal
pile convey the ground water to the coal handling sumps. The total average flow to the.
coal yard sump is calculated to be 0.053 MGD..
Oil Storage Run -Off
Plant Allen has an above ground oil storage tank with a capacity of 100,000 gallons, an
aboveground 5,000 gallon used oil storage tank and one underground gas tank with a
550 gal_Qt�.oapacit-y. The above ground tanks have primary containmen In -t rm o
dikes. Any spills not contained within the dikes would be routed to the ash basin
through the yard sumps. The underground gas tank is of double -walled fiberglass
con
All storage facilities are presently covered under the Spill Prevention and
Countermeasure Plan.
Boiler Cleaning:
All five (5) boilers at Plant Allen are chemically cleaned with the next cleaning
scheduled for 1996. The volume of the boilers determines the quantity of chemicals
required for a cleaning. Boilers #1 and #2 each have a water side volume of 26,700
gallons. The volume of boilers #3, #4, and #5 is 40,100 gallons each. The volume of
dilute waste chemical discharged from unit #1 or #2 during a cleaning is 294,000
gallons. The volume of diluted waste chemicals drained from #3, #4 and #5 totals
450,000 gallons each. These wastes are drained through temporary piping to the
permanent ash removal lines which flow to the ash basin. Immediately prior to the
beginning of a boiler chemical cleaning procedure, additional blocks are added to the
ash basin discharge structure. This assures longer retention time of the chemical
wastes for proper treatment through dilution, neutralization, precipitation, and ion -
exchange as documented in the Ash Basin Equivalency Demonstration (October,
1976). A list of the chemicals and amounts required to clean the boilers at Plant Allen
follows:
2

Chemicals
Boilers 1&2
Sodium bromate
550 lbs
Ammonium carbonate
1000 lbs
Ammonium hydroxide
850 gal
Hydrochloric acid
3700 gal
Thiourea
1680 lbs
Citric acid
300 lbs
Soda ash
2200 lbs
Plant Allen, Gaston County
NPDES # NC0004979
May 20, 1994
Boilers 3, 4 & 5
550 lbs
1000 lbs
950 gal
5500 gal
2010 lbs
400 lbs
3400 lbs
Floor Drains
The wastes which enter the floor drains at Plant Allen accumulate in the boiler room
sumps and turbine room sumps.
The water which flows to the boiler room sumps originates from such sources as floor
wash water, boiler blowdown, water treatment waste, condensates, equipment cooling
water, sealing water and miscellaneous leakage (refer to the attached schematic of
water flow for individual flows).The effluent from the units 1 through 4 boiler room
sumps is flushed to the yard drain sump. The effluent from the unit 5 boiler room
sump is flushed to the power house sump, which is then flushed to the yard drain
sump.
The turbine room sumps accommodate flows from floor washing, leakage, and
occasional condenser water box drainage. The effluent from units 1 through 5 turbine
room sumps are flushed to the yard drainage sump.
Water Treatment System
The water treatment wastes at Plant Allen consist of sedimentation, filter backwash,
demineralizer regeneration wastes and boiler blowdown. The make-up water
treatment system is comprised of a clarifier, five gravity filters, two activated carbon
filters and one set of demineralizers. Make-up water is used in the boilers.
Clarifier.
The clarifier has an average production of 0.252 MGD. Polymer and clay are
used to affect precipitation and thus remove suspended solids from the raw
river water. Desludging of the clarifier takes places approximately 8% of the
unit run-time with an average volume of 2300 GPD going to -the ash basin.
Gravity Filters:
There are five (5) gravity filters composed of anthracite which follow the clarifier
in the water treatment process. One of these filters is backwashed every day
with a waste flow of 21,000 GPD. The gravity filters are changed out on an as -
needed basis with approximately 620 ft3 of used filter medium disposed of in
the ash basin.
3

Plant Allen, Gaston County
NPDES # NC0004979
May 20, 1994
Activated Carbon Filters:
In addition to the gravity filters, there are two (2) activated carbon filters.
These filters are backwashed twice per month. Approximately 30,000 gallons
of water are required to backwash each of these filters. The activated carbon
filters are composed of approximately 250 ft3 of granular activated carbon
(coal). The spent filter medium is changed out yearly and is disposed of in the
ash basin.
Reverse Osmosis (RO) Unit:
A Reverse Osmosis (RO) unit is used to decrease the conductivity in the make-
up water, thereby increasing the efficiency of the demineralizers and reducing
the amount of chemical needed for demineralizer regeneration. Sulfuric acid
(25%) is injected at a rate of approximately 5 gal/day to control pH. During
operation, the unit has a continual blowdown of 60 gal/min which is discharged
to the ash basin. Sodium bisulfite is then injected downstream of the RO unit to
remove any residual chlorine. The concentration of sodium bisulfite is
maintained at 2 ppm. The RO unit is cleaned on a quarterly basis with the
waste going to the yard drains and eventually the ash basin. During a cleaning,
approximately 30 lbs of the cleaner OSMO AD -20 containing sulfamic acid,
citric acid and sodium lauryl sulfate is used. Also used is a generic cleaner
consisting of tri -sodium phosphate, sodium laurylsulfate and sulfuric acid with
approximately 400 gallons of waste water going to the ash basin.
Demineralizer.•
The demineralizer consists of two (2) mixed -bed cells. Only one of these cells
is operated at any one time. The cell which is in operation is regenerated
approximately once every 4 days of operation. A regeneration requires 42
gallons of 660I3e sulfuric acid and 150 gallons of 50% sodium hydroxide. An
average dilute waste chemical and rinse flow of 20,000 gal is realized. The
dilute acid and caustic are discharged to the floor drains simultaneously
through the same header for neutralization purposes. All regeneration wastes
are flushed to the ash basin. The demineralizer resin is changed out
approximately once every 5 years with the spent resin going to the ash basin.
Approximately 1 mL of the surfactant Triton CF -54 or similar product is added to
the new resin to improve separation.
Boiler Blowdown:
Each of the five (5) boilers at Plant Allen blowdown at an average rate of
approximately 500 lbs. of steam per hour. The blowdown is allowed to flash in
a blowdown tank. Most of the blowdown is vented to the atmosphere with a
minimal amount of condensate discharged to the boiler room sump. The
average condensate flow to this sump is 0.004 MGD. Hydrazine is maintained
at a concentration of 25 ppb in the condensate system for deoxygenation. A
minute amount of hydrazine (<10 ppb) may be present in the condensate flow to
the boiler room sump.
4

Plant Allen, Gaston County
NPDES # NC0004979
May 20, 1994
Sanitary Wastes
A well supplies the drinking water requirements of Plant Allen. The sanitary waste at
Plant Allen is treated in a septic tank followed by a sand filter. Approximately 190
people are responsible for the load on this system. An average flow of 4850 GPD is
treated by the unit. The sand filter effluent is routed to the ash basin via the yard
drainage sump. The sand filter sand is replaced on as -needed basis with the sand
disposed of in the ash basin.
Ash Disposal
Plant Allen utilizes electrostatic precipitators to remove fly ash from its stack gases.
These precipitators require approximately 4.5 IVIGD for fly ash sluicing to the ash
basin. Bottom ash sluicing to the basin requires approximately 2.8 MGD for a total
average_ ash removal flow of 7.3 MGD.
Recirculating Water System
Plant Allen has 2 recirculating water systems (RCW): a chiller system and a pump
cooling water system. Both systems use the biocide H-310, H-303WB, H-300 or .
similar products. In addition, the corrosion inhibitor CS or similar product is used.
Generally, these systems are closed loop, but may need to be drained occasionally.
All such water would enter the floor drains and then be discharged to the ash basin.
Miscellaneous Waste Streams
Laboratory Wastes:
The chemistry lab on site performs a variety of water analyses and routine
sample collections. Therefore several chemicals are used in the lab in small
quantities for sample preservation, bottle rinsing, equipment calibration,
conductivity analyses, etc. The wastes are flushed down the sink and
discharged into the yard drainage sump and then pumped to the ash basin.
(See attached table of hazardous substances for specific chemicals used and
maximum quantities kept in the lab.)
CO2 Injection System:
During warmer periods of the year, algae blooms occur in the ash basin causing
pH levels to rise. A CO2 system is utilized during these events to maintain the
pH level below 9.0 standard units.
Turbine Non-destructive Testing:
Approximately once per year, one turbine is tested for cracks in the generator
shaft using an ultrasonic nondestructive test. During the process a maximum of
400 gal of demineralized water mixed with 4 gal of corrosion inhibitor is used
and discharged to the ash basin.
R

Plant Allen, Gaston County
NPDES # NC0004979
May 20, 1994
Heat Exchanger Cleaning::
From time to time, it may be necessary to clean the small heat exchangers with
polyacrylamide, polyacrylate, sodium laurylsulfate and tri-sodi um phosphate. All
wastes would be routed to the ash basin.
Condensate Polishers:
Plant Allen utilizes condensate polishers which divert a portion of the normal
condensate (closed system) flow through one of two cells per unit. The
polishers provide filtration as well as ion exchange functions to remove or
substantially reduce dissolved solids and suspended matter present in the
condensate stream. The polishers require precoating with a combination of
anion and cation resin. To facilitate precoating, 125-150 mL of a solution of
polyacrylic acid (25%) is added to the precoat slurry. Upon exhaustion, the
precoat is removed from the filters by water / air blasting and flushed to the ash
basin via sumps. Condensate water is used to remove the exhausted precoat
at the rate of:
Unit 1 & 2 -1558 gal/precoat
Units 3 -5 - 2090 gal%precoat.
A total average waste flow of approximately 980 GPD to the ash basin is
realized.
Condenser Leakage Testing:
Approximately 1 Ib. of a disodium fluorescing dye added to 15,000 gals of
demineralized water is used occasionally to test the condensers for leakage.
All wastes from the testing would be routed to the ash basin.
Discharge 003 -
Outfall 003 discharges into the CCW discharge canal. The discharge consists of
cooling water from units 4 and 5 mill oil coolers, boiler feedpump hydraulic coolers and
other miscellaneous equipment cooling. This water is once -through, non -contact
cooling water withdrawn from the service water system.
Discharare 004 -
Equipment Coolina Water
Cooling water for units 1 and 2 mill oil coolers, boiler feed pump hydraulic coupling
and other miscellaneous equipment is discharged through outfall 004. This water is
once -through, non -contact water drawn from the service water system. In addition,
water from a vehicle rinse -down area is directed to this outfall. The rinse water
contains no soaps or other additives
D

Plant Allen, Gaston County
NPDES # NC0004979
May 20, 1994
Intake Screen Backwash
The intake screens at Plant Allen are flushed on an "as needed" basis. Backwash
usually averages 2 hours per shift. The average volume required is 0.84 MGD. The
large debris floating on the river is caught on the parallel bar screens. This trash is
collected and disposed of in a landfill. The silt, twigs, leaves and other light debris
collected on the rotating screens are indigenous to. the river and are therefore flushed
back with no harmful environmental consequences.
Discharge 005 - Asiatic Clam Filter
Water for the Unit 5 CCW water is filtered for Asiatic clams. Asiatic clams, common in
Lake Wylie, can clog the condenser tubes. This filter is backwashed once a week for
15 minutes. A maximum flow of 3000 GPD is realized. No other additives are in the
backwash water.
7