NC0004979_Duke Power Company's 316_19940520

Plant Allen, Gaston County
NPDES # NC0004979
May 20, 1994
Plant Allen 316(a) Determination
Duke Power Company's 316(a) demonstration (March 1976) concluded that the
"heated discharge from Plant Allen is such that the protection and propagation of a
balanced indigenous aquatic community in and on Lake Wylie is assured."
Duke's operation experience during the past five years -under the thermal limitations
imposed in NPDES Permit No. NC0004979 substantiates the above conclusion and
further supports Duke's 'belief that the operating characteristics of the station have a
minimal effect of the aquatic environment of Lake Wylie. Surveys of the aquatic
community in Lake Wylie demonstrate that a Balanced Indigenous Population exists in
Lake Wylie (see attached report). Accordingly, Duke requests a 316(a) variance and
further requests that the thermal limitations imposed in the permit be continued.
0

Plant Allen, Gaston County
NPDES # NC0004979
May 20, 1994
LIST OF HAZARDOUS SUBSTANCES (SECTION 311)
SUBSTANCE
QUANTITY
LOCATION
USE
Ammonia molybdate
2000 gm
Lab
Water Analysis
Acetic acid
1 qt
If
of
Ammonia
1 Ib (gas)
Powerhouse
Water treatment
Ammonium hydroxide
55 gal
of
of
Chlorine
15001b
of
of
Ferric sulfate
360 g
Lab
Water Analyses
Hydrochloric acid
2 gal
it"
Monoethylamine
6L
itWater
Analyses
Nitric acid
6 qt
"
Potassium hydroxide
3 Ib
"
Sodium bisulfite
5 lb
Powerhouse
Water Treatment
Sodium hydroxide
5000 gal
Demineralizer regen.
Sulfuric acid
5000 gal
Yard
Demineralizer regen
Sulfamic acid
1001b
Powerhouse
RO unit cleaning
Values represent maximum quantities on-site and do not necessarily reflect quantities
discharges. Treatment of these and othr chemical substances is achieved by the ash
basin. Refer to "NPDES Supplemental Information" for a list of chemicals and
amounts used for boiler cleaning.
0

Plant Allen Water Use Schematic
Gaston County
Cooling
Water
E
D
M Misc. Equip.
Cooling and
Seals
Water
Treatment
L J
CATAWBA A Service
RIVER F Water
c
P
Screen
Backwash
Filter
B IBackwash
K
J�N
Boiler Room
Sumps
I Ash I
Sluicing
E
S
IT urbine Room
Sumps
NPDES # NC0004979
001
Sump
R T
Stormwater (2)
Ash
Basin 002
x
Permanent Lines
Temporary Lines
Coal Handling
Sanitary
Sumps
Waste
v
Q
Stormwater (1)
Coal Yard T
Sump
j
and Drainage
Sump
R T
Stormwater (2)
Ash
Basin 002
x
Permanent Lines
Temporary Lines

Y�
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Plant Allen, Gaston County
NPDES # NC0004979
Water Use Schematic
001 CCW Discharge 428.5
002 Ash Basin Discharge 11.660
003 Misc. Cooling Water 6.340
004 Intake Screen Backwash and Misc Cooling Water 8.010
005 Clamtrap Filter and Debris Backwash 0.018
Flows based on historical data where available. For more information, see "Supplemental Information".
Flow Stream
AvQ.Flow (MGD)
A
Intake Water
453.7
B
Clam Trap and Debris Filter Backwash
0.003
C
Intake Screen Backwash
0.840
D
Condenser Cooling Water
428.5
E
Water Box Drainage
Intermittent
F
Service Water
24.699
G
Boiler Makeup aAter
0.175
H
Evaporative losses
0.115
1
Condensate, Seals and Leakage
0.056
J
Water Treatment System
0.332
K
Water Treatment Waste
0.068
L
Misc Equipment Cooling and Seals
17.074
M
Boiler Feedpump and Mill Cooling Water
7.170
N
Boiler Blowdown
0.004
0
Misc. Equipment Cooling Drains
0.62.1
P
Ash Sluicing
7.343
Q
Sanitary Waste
0.005
R
Boiler Room Sumps
2.965
S
Boiler Cleaning Wastes
Intermittent
T
Coal Yard Sump
0.058
U
Turbine Room Sumps
0.677
V
Coal Handling Sumps (Stormwater and groundwater
0.053
seepage)
X
Yard Dain Sump
3.689
Y
Ash Hopper Seal Overflow
2.893
1
Stormwater
0.018
2
Stormwater
0.570
001 CCW Discharge 428.5
002 Ash Basin Discharge 11.660
003 Misc. Cooling Water 6.340
004 Intake Screen Backwash and Misc Cooling Water 8.010
005 Clamtrap Filter and Debris Backwash 0.018
Flows based on historical data where available. For more information, see "Supplemental Information".