NC0004961_Waste Load Allocation_19890228

PERMIT NO.: PIC00 o 4 9�1
NPDES WASTE LOAD ALLOCATION
9L WI-P.S
FACILITY NAME: Q� �e°u'Q'� Lrv`���+Y
Facility Status: rmwm OPOSED
(circle one)
Permit Status: RENI:w ifODf�ATIM
(circle one) —��`
MaJor m RO.- ._
Pipe No: e01 024 4hr4ug�
Design .Capacity (MGD):
Domestic (S of Flow):
Industrial (% of Flow): EGD
Comments:
RECEIVING STREAM:
Class: WS`.
Sub -Basin:
w4 1�P✓
Reference USGS Quad: r /o. 5w (please attach)
County:
Regional Office: As Fa (inRa Wa Wi WS
(etrele sae)
Requested By: r;4&
Prepared By:
Reviewed By
WDate: g
�--� Date:
C�
Modeler Date Rec.
7< -Cp
Drainage Area (mid) Avg. Streamflow (cfs):
7Q10 (cfs) Winter 7Q10 (cfs) 30Q2 (cfs)
Toxicity Limits: IWC (circle one) Acute / Chronic
Instream Monitoring:,
Parameters
Upstream Y Location M,J �� ��� ° " e'fzt4
Downstream Locations
Effluent
Characteristics
Summer
Winter
BODS (mg/ 1)
NHf N (mg/1)
D.O. (mg/0
TSS (mg/1)
F. Col. (/100ml)
PH (SU)
6-
/
Comgm-en's:°-�°/1

RETURN TO TECHNICAL SERVICES BYMA v nnTUD n
Request No. :5148
--------------------- WASTELOAD ALLOCATION APPROVAL FORM ---------------------
Permit Number
: NC0004961
Facility Name
: DUKE POWER RIVERBEND:
001
Type of Waste
: ONCE THRU COOLING
Status
: EXIST/REN
Receiving Stream
: CATAWBA RIVER
Stream Class
: WS -III, B
Subbasin
: 030833
County
: GASTON
Drainage Area
(sq mi)
: 1800
Regional office
: MRO ft�
Average Flow
(cfs)
: 2700
Requestor
: LULA HARRIS
Summer 7Q10
(cfs)
: 801) w �Ks�•^
Date of Request
: 2/28/89
10
(cfs)
: 31140 19
Quad
: F15SW
30Q2
(cfs)
:
------------------------- RECOMMENDED EFFLUENT LIMITS-------------------------
Wasteflow (mgd):
temperature (C) :
Ammonia Nitrogen (mg/1):
Dissolved Oxygen (mg/1):
TSS (mg/1):
Fecal Coliform (#/100ml):
pH (SU):
recomm. exist.
monitor monitor
35 35
6-9 6-9
Upstream (YIN): Y Location:
Downstream (YIN): Y Location:
C Pe^
c �-t .
t
. ...a,L � is i•'d!a
MONITORING 4
u
(WEEKLY TEMPERATURE)
(WEEKLY TEMPERATURE)
COMMENTS
APPLICATION INDICATES FLOW AVERAGE OF 253 MGD; DMR'S INDICATE MAX OF 96.5 MGD.
PER CURRENT PERMIT, RECOMMEND NO DISCHARGE OF CHROMIUM, ZINC, COPPER, AND
CHLORINE. NO PRIORITY POLLUTANTS ABOVE DETECTION IN PPA.
BY LETTER AND AMENDMENT TO CURRENT PERMIT, RESULTS OF A STUDY TO ASSESS
IMPACT OF SURFACE AND GROUNDWATER INPUTS WAS REQUIRED TO BE SUBMITTED 180 DAYS
PRIOR TO EXPIRATION.
Recommended by—p'-4-0,L( Date Y2&
Reviewed by:
Tech. Support Supervisor Date q/Zg/ "
Regional Supervisor , ' ' AJ1 Date
Permits & Engineering (,( Date

�
11
�
I
w
S
'
'
I

PLEASE PRINT OR TYPE IN THE UNSHADED AREAS ONLY. You may report some or all of
[his information on separate
EPA I.D. NUMBER (copy /tont Item / of Form I)
sheets (use the same format) instead of completing these pages.
SEE INSTRUCTIONS,
RiVerbend Steam Stc. tion
form Approved.
NC 0004961
OMB No. zoao•ooss
Approval expires 7.31-88
V. INTAKE AND EFFLUENT CHARACTERISTICS (continued from page 3 Form
CCW
of 2-C1
PART A -You must the
OUTF LL NO
provide results of at least one analysis for ever y pollutant in this table.
001
2. EFFLUENT
Complete one table for each outfall. See instructions
for addititxlnl dtltailS.
I. POLLUTANT S. MAXIMUM DAILY VALUt VALUE C.
avollab/e
3. UNITS
4, INTI► I
aua
ill (+) rwy 5'i Il
.. BI i.r[wTloN (+I rw[■ ill
a (specify If
d. NO. OF
blank)
O t1017a1
a. LO
mieal
pp�a CONC[NTRATION
Parnand
isl rwa■ ANALYSES a.CONCEN-
TRATION
:1 MASS
4 No. Or
ill ANALY7g.S
(HOb)� 2.6 2194
Co G[NTNw
IChum I
Y IAAF "and 6. 7
1 mg/1
Ib/day
3.4 2477 1
rc 5653
G. r:&al''011anie
Ca,rt*n i roc) 2.5
1 mg/1
lb/day
5.8 4225 1
2109
d. TotalSupended
8olldt (WS)
1 mg/ 1
lb/day
1.9 1384 1
9 7593
°•llmmonb(as N)
1 mg/1
lb/day
7 5100 1
.06 51
f, Flow VALUE
VALUE VALUE
. 101.1
1
mg/1
1b/day
.05 36 1
96.9
e• Tfmparaturf VALUE 9 07.3
VALUE
3 MGD
VALUE
VALUE
(winter) 26.4
87.3 153
7
r,. Temperature VALUE VALUE 23.6 17.7
88 off+ VALVE
Oty 1.
(summer) 36.3 VALUE
13.0 88
MINIMUM
( i• PH
34.9
MAXIMUM ' MINIMUM 33.3
MAXIMUM
VALUE
65 °C
27 8
8.0
•
65
PART S - Mark •'X" in column 2-a for each pollutant you know or have
1 STANDARD UNITS
which is limited either directly, or indirectly but expressly, in an effluent limitations guideline, you must
reason to believe is present. Mark"X" in column 2-b for each pollutant you believe to be absent. If You markcolumn
column 2a, you must provide
quantitative data or an explanation of their presence in your discharge.
any pollutant
provide the results of at least one analysis for that pollutant. For other pollutants for
Complete
1. POLLUT- 2• MARK 'x•
one table for each ouHall. See the instructions
which you mark
fo edditiona lstns
ANT AND a ai- b w 3. EFFLUENT
CAS NO, 1[v[ �1[v[ a• MAXIMUM DAILY VALUE b• MAXI uM 39 DAY VALUE c.L N T
(Ifava/lable '"`- ••-
R 4' UNITS
and r
requirements.
3.
J •[NT [[NT SIM e
f VA E
aLa ! dNO.
INTAKE (optional)
O
CONC[NTw ATION (2) r•[• 1 (al rw[[ 1 ANAL- `•-ONCEN-
CONCINTR ATION CONC[NTNATION I+) MA[■ RATION b. MASS
a. 8 rOmkla Y f E f
a. L
AVERAGE VALUE NO. Oh
i2�86ta i7 9l X C • 2 169
c
CONC[NTRwTION (s) 14465 YSES
Total Ft �duai X C
1 mg/1 lb/day
c .2 < 146 1
0
C. color ' `
- X 10
-- Itl�?/1 /ally
:b
0 0 1
X
J. Ffsy
coufo`tt, X 3
is Y
10 X 1
X
olonies
f
+. FtuwMe'
.6
(18961-a) X
1 l u rll X
49 X 1
.10 84
i
'jIrl�te (as AV) X .054 46
1 m 1 lb da
.1 73 1
EPA Form 3610-2C (Rev. 2-85)
1 mg/1 lb/day
, 059 43
PAGE V-1
1
CONTINUE ON REVERSE

EPA I.D. NUMBER (copy /tom /t¢m I o/ Form /J OUTFALL NUMBER
NC 0004961
CONTINUED FROM PAGE 3 OF FORM 2-C
001
Form Approved.
CCW OMB No. 2040-0086
PART C - If you are a primary industry
/approval expires 7-31-88
and this outfall contains process wastewater, refer to Table 2c-2 in the instructions to determine which of the GC/MS fractions
2-a for all such GC/MS fractions that apply to your industry and for ALL toxic must "X"
metals, cyanides, and total phenols. If you are
wastewater sett.//s, and mark
2 GC/MS /rectionsJ, mark "X" in column 2-b for each pollutant you know or have
believe is absent. If you mark column 2a for
column
you test for. Mark in column
not r squired to mark column 2-a (secondary industries, nonprocess
reason
any pollutant, you must provide the results of at least one analysis for that pollutant.
of at least one analysis for that pollutant if you know or have reason to believe it
dinitrophenol,
to believe is present. Mark "X" in column 2-c for each pollutant you
If you mark column 2b for any
pollutant, you must provide the results
will be discharged in concentrations of 10 ppb or greeter. N you mark column 2b for scrolein, ac
or 2 -methyl -4, 6 dinitrophenol, you must provide the results of at least one analysis for each of these pollutants which you know
acrylonitrile, 2,4
concentrations of 100 ppb or greater. Otherwise, for pollutants for which have
or reason to balk" tt►st
be discharged. Note that there are 7 p p you discharge in
you mark column 2b, you must either submit at least one analysis or briefly describe the reasons the pollutant is expected to
pages to this art; lease review each carefully. Complete one table (.// 7 for
I. POLLUTANT
AND CAS
pegesJ each
2. MARK 'X' '
outfall. See instructions for additional details and requirements.
NUMBER
(l/auattable
SILTUIT
INa
we-
b a■-
pcva
wE-
c ■a- a. MAXIMUM DAILY VALUE
esus
3. EFFLUENT
b. MAXI �30op/iV VALUE c.LONG T
e!!// 6611I.
M r . VALU6
4. UNITS
!.';+ qKE (opNonalJ
oulw- satyr ■i HT II)
CONC aNTR ATIOM
METALS CYANIDE, AND TOTAL PHENOLS
(a) .IA��
CONCENTRATION
(a) MASS
o0
11)
CONCENTRATION
0 ¢
a
(z) ..as
d NO.OF
ANAL-
USES
a. CONCEN-
TRATION
ax MASS
(t1 cowYaai
b. No.ot
ANAL
1 M. Antimonv,
)
rw tt R (a atAu
YSEs
Total (7440-36-0)
X
c .6
c 506
2M.
aaasezj.Taal
X
1
!rV.
la/ ay
.6 c437
j
1
c .34
3M. Beryllium,
Total, 7440-41-7)
X
1
ug /1
1:) / fay
i l. l c. 60
1
c .001
C .84
4M. Cadmium.
Total (7440-43-9) X
` 004
.DOJ. c . 73
1
< 3
SM. Chromium,
Total (7440-47.3) X
004 3
1
.03 C 25
7444+gjTOW X
.7 -2 c,03 c22 1
. 03 c 25
7M.Lead. TOW -
;7439-x2-11 X c; 2
1 rl:g/1 lb/'i3Y c .03 -7:122 j
C 7
..
iaaMercury. Total X
1 u8/1 lb /tial 4 2 c 1.5 1
c.08
)M. Nickel. Total--- — --- --- --
7440-02-0) X
1 ug/J. lb/1137
1
<. 04 c .34
.07
10M. Selenium, —
notal (7782-49-2) X
1 :•1�;/t lb/(Ia:r C .04 -29 1
< 2 --12
1440-22 4,) To tel X
1 ,!1 Iiglb/day -:z,2 ; 1.5 1
c ..04 c 34
2M.Thalllum
otal (7440-2i•0) X c
1 1g/L lb/day c .04 -44- 29 1
.5 -':422
_
3M. Zinc, Total -------
1440-66-6) X
1 ,ag!l Lb/.jay -; . 5 j
-�' 364
.017 14
4M. Cyanide, -- --
otal (57-12-6) X �' 01
. 02 �: 15 1
<3
Phenols,
o ai X(.
C
O1 �: % 1
. 005 C 4
IIoxIN
7,8 -Tatra-
1 mg/1 lb/daY .005 c 4 1
.ox
DESCRIBE RESULTS
X
In 1764- 1
+0x1(7 (1784-01-6)
NOT DETECTED
.-'A Form 3510-2C (Rev. 2-85)
PA( -,F V-3
CONTINUE ON REVERSE

CONTINUED FROM PAGE: V-4
EPA I.D. NUMBER (copy from 11e`n / of —n+ 1) Ula I -FALL IJUMBER
N6
" "'-PP, rr�.
OMB
0004961
No. 2040-0086
I. POLLUTANT 2. MARK
AND CAS
'x,
001
ccw
Approval expires 7.31-88
NUMBER a�H `T b.-
J OU1,alwlT
3. EFFLUENT
C- •c- e. MAXIMUM DAILY VALUE b. MAXIM M
�i.vc p/�Y VALUE c,LONG T M /�yp .VALUE
1 ouaiable) I
4.
d
UNITS
3. INTAKE v
(ptiorlal) -
as MT aUat a e
b(
.. ..rw wnur. (ai wwaa () la) w.ws■ ()
�oti�wr.rwwri or COtiC[NTI.w T10M 1+) .+was
GC/MS FRACTION — VOLATILE COMPOUNDS
NO OF
ANAL-
vsES
CONCEN-
a. b. MASS
TRATION
B. LONG TERM
b. NO.O
ANAL
22V. Methylene
(con(inued)
1.1 COMCaM-
TFl •TION
Ia) N.ss
YCEs
Chloride (75-09-2) X
c 5
c 4
23V. 1.1,2,2 -Tetra-
chloroethane X
— —
1
ug/J,
lb/day
c 5
c 4
1
(79-3")
< 6.9
c 6
24V. Tetrechloro-
X
—
1
ug/1 lb/day
c 6, 9
c 5
1
ethylene (127-18-4
C 5
C 4
6V.Tx3! ne X
— --
1
uC /J,
lb/day
c 5
c 4
1
c6
c5
26V. 1,2 -Trane-
0ichloroathylone X
1
uu/1
lb/day
< 6
< 4
1
(156-60-5)
C 5
< 4
27V. 1,1.1 -Tri-
chloroethane X
-- --- —
ug/l.
lb/day
c 5
c 4
1
(71-66-6)
c 5
c 4
20V. 1,1,2 -Tri- —
chloroethane
X
--- --
--
1
ug/1
lb/day
< 5
¢ 4
1
(79-00-6)
< 5
c 4
ethylene V.Trichloro- X --
--- --
---- --- -
1
ug/1
lb/day
< 5
< 4
1
c5
c4
30V. Trichloro.
Iluoronwthene X
— — —
—
1
ug/1
lb/day
c 5
c 4
1
(76-69-4)
< 5
c 4--
31V. Vinyl
Chloride (75-01-4) X
10
_--
-----
1
ug/1
lb/day
c 5
< 4
1
<
< 8
3C/MS FRACTION — ACID COMPOUNDS
1
ug/1
lb/day
10
IA.
c
c 7
1
2-Chioropheno
c
'A. 2,4•bict{ryoro-
.henol (ice -2) X
1
ug/1
lb /Ii37
- l0
< 7
1
17
3
IA, 2,' bk4,rvI-
h+na,2lffi tt7-0) X
1
ug/.l
lb/day
_ 1 Q
7
1
10
-: 3
4 apk*kto-O-
:re-1J&34,62-t).. X<
1
ug/1-
lb/dal
;; 10
<7
1
50
" ;i2
iv 41 s).. X
1
ug/J.
lb/day
�' 50
c 36
1
502
. -ii
a-i6N6 phenol
1
ug/1
lb/day
< 510
< 36
10
-. 3
1
A.
100-02-1))Opnenoi
1
1-19/1
lb /day
<, 10
< 7
A. P -Chloro -M.
raof (59-647)
1
ug/J.
lb /lay
5020
36
.
1
�. Pentachloro•
nm
nmol (87-86.6) X
1
uy-,/J.
Ib/(iay
< 20
c 15
1
c 50
c 42
0A. Phenol
0e•e5•2) X
1
ug/1
lb/day
< 50
c 36
1
c 10
c 8
A. 2,4,6 -Tri.
lore
X
1
ug/7•
lb/day
c 10
< 7
-2)
< 10
1
1
1-19/1
1b/day
< 10
c 7
1

CONTINUED FROM PAGE V4i
EVA I.D, NUMBER (Copy /rom Item 1 o/Form 1) OUTFALL NUMBER
NC
Form Approved
r
I- POLLUTANT 2. MARK'X'
AND
0004961 001
1CCW
OMB No. 2040-0086
Approval
CAS
11
expires
7-31-88
NUMBER ATKaT tXwo
INy �v■
(!/au•Ilablt) uuiw- "a
c.�-
���i •. MAXIMUM DAILY VALUE
3. EFFLUENT
b• MAXI M A y pA Y VALUE C. 4. UNITS
auollable LONG T M
,
'�O�
5. INTAKE
■.NT •.NT
�.`.� FR cor,caNTww T,uN
ACTION — BASE/NEUTRAL COMPOUNDS
laI •&was
(i 6
�o/�OV/C , VALUE NO.OF
ISI ANAL- S• CONCEN-
towce NTI,w T10N I+I rwaa b. MAS!
I+I
/uprlOrl.l)
•. LONG TERM
b. NO.O
+2 8. 1,s-Dlch loro-
CONClNTIMATION a•waa YSES TRATION
I•I CONC•M-
I+I YAC■
ANAL
b•nzoM (106-48-7 X
C 10
<8
T 1� A T I OM
Y Q E§
238. 3,3'-Dkhlor
b*m;dln•
X
- 1 ug/i
--_-
Th/dav
<10
< 7
(91-94-1)
c 20
<17
1
248- Dlfthyl
Phth+l�l�
X
_ 1 ug/'.
1.h /dav
c 20
(o4 -eat)
e 10
c 8
c 1.5
1
i Pht0.� y 3 yl X
1131-t11
< 10
-- __-- 1 u/i
lh/dav
c 10
c 7
1
.,
<g
Ph X
13♦iF4�
c 10
1 ug,/1-
lb/dav
c.10
7
1
<8
z7e..s4 pr,ta.
caws+• X
L121-t4ia1
c 10
1 uQ/1-
Ih /dav
c 10
c 7
1
c 8
209a4,aDll,wo
-W"00111-30-21 X
< 10
1 u /1
lb/dayc.10
c 7
<8
1
208. pMl po>,rl
thalaft1
(117 X
ug/1
lb/day
c.10
)
< 10
<8
—
< 7
1
308- 1,2-DbhanyL
wd r ne No Aso. X
--
--
— _ 1 ug /�
lh /dav
<10
) ( 7.22-6&7
C 10
<8
—
c 7
1
ranttone
320044.0) X1
� 10
ug /1
lh /day
c 1.0
c 7
<8
1
sc,73 kA X
< 10
__-- 1 ug /1
1.h /dav
<10
< 7
< 8
1
114.74-li Xc
1 fl
1 ug/1].0
c 7
1
349, H94♦
c8
_hlpr4X
lcn,
1
--- ug/1
7-b /d2 -,r
<
10
c 7
c$
1
y.,
7yX
< 10
c8
--- 1 ug/1
1 b /d,�;r
-.,
c 1 (1
C 7
1
21) X
<
ug/1
lb/day
<10
101
<8
< 7
1
76. IrAjew .
l.:,aod) ryrr.n.X
oa3-sa-e)
< 10
- 1 ug /1
lb/day
c 10
c 8
c 7
1
S0- IWPhorone
18.61-1)
1
X
< 1U
cg
ug/1-
lb/day
<10
c 7
1
013. h•I•n.
1
-0-3) X
—
10
<8
ug/1
lb/day
c 10
c 7
1
013. obenz•n•
1
)8-95-3) X
< i0
cg
ug/:-
ib/day
<10
< 7
1
1B. N -Nitro -
32 -75-9) amin• X
< 10
c 8
1 ub/'.
1.b/day
<10
c 7
?0- N-Nltro•odl-
1
_
-PrOPYl•min• X
21-64-7
C 10
<8
----- 1 ug/1.
lb/day
c10
< 7
1
1 uo/1
lb/day
c 10
c 7
1

CONTINUED FROM PAGE V-8
EPA I.D. NUMBER (copy %rom /tern 1 o/Form 1)
OUTF
CCW
NC 0004961
OMB No. 2040-0086
1. POLLUTANT
2. MARK 'x'
AND CAS
NUMBER
_
a :�T .. C tea-
3. EFFLUENT
!r/uaa�loblrJ
kvc �i.vc
ou�w- siker .�:;T
B. MAXIMUM
(,1
MAXI M
DAILY VALUE Y VALVE C.LONG T1
aoa/lableJ
GC/MS FRACTION
-PESTICIDES (continued) HAT ���
_ //
I:1 .,w., I.1 f+1 „A„ 1 1
I:ONCk MTHwT10N
CONCCryiRATI
17P. Heptachlor
TAA►ION
Epoxide
X
1
_
(1024-67-3)
<. 01
C . O1
C .01
18P• PCB -1242
ug/1.
lb/day
c. 1
(53469-21-9)
X
C . 1
_
C .08 - -----
193• PCB -1254
c.2
c.15
---
1
X
C .2
__
C .17 -.------ ---
20P. PCB -1221
1
1
ug/1
(11104-28-2)
X
c .2
C .17 -- -- --
21P. PCD -1232
Ug/1
lb/day
c.I
(11141-18 6}
X
C
_
lb/day
c.2
.2
c .17
22P. PCB -1248
ug/1
lb/day
c.l
(12672-29-6)
X
c . 1
c .08 --- ---
232. PCD -1260
c. 5
c. 36
1
(1109 82-5)
X
C
.2
c .17
24P. PCB -1016
-
(12674-11-2)
X
C
.1
C .08
25P. Tox4phMa
(8001-36-2)
X
C .5
_
C .42 ------- ---
PAGE V-9
J M B E R
Form Approved
CCW
OMB No. 2040-0086
Approval expires 7.37-88
I�a. VALUE
P Tl N
4. UNITS
5. INTAKE (0Ptlonal)
ANAL -L-
(rl •.wsc VSF.S
a• CONCEN�
TRATION
b. MASS
a LONG-TERM
(I) CONCHN-
b. No
ANA
TAA►ION
IT) YAaa
VSE
1
ug/7-
lb/day
<. 01
<. 01
1
1
ug/1.
lb/day
c. 1
-:1.07
1
1
ng/J.
lb/day
c.2
c.15
1
1
ug/1
lb/day
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1
1
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c.2
c.15
1
1
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c.I
c.07
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_ 1
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c.2
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c. 5
c. 36
1

NPDES
Supplemental Information
for
Riverbend Steam Station
Date: 2/89

A schematic flow diagram of water use, treatment
accomplished, and discharges indicating rates of flow�forr individual waste
streams is attached. A brief discussion of the individual waste streams s
s
1• Boiler Blowdown: The blowdown from the boilers at Riverbend Steam
Ts allowed to flash in a blowdown tank. The condensate is drained Station
boiler room sumps. Boilers #7 and #8 blowdown at an average rate of
lbs. of steam to the
per hour. Boilers #9 and #10 blowdown at an average rateof
1000 lbs. of steam per hour. The combined condensate condensate flow
blowdown amounts to an average of approximately MGD. This flow is
routed to the ash basin. The waste steam is vented to the atmosphere. from
m
2. Floor Drains: The waste water which enters the floor drains at Riverbend
is accumulated in either the boiler room sumps or the turbine roomsup.
Waste water which flows to the boiler room sumps originates from the
following sources: ms
1• Floor wash water,
2. Boiler blowdown,
3. Waste water from demineralizer regeneration,
4. Equipment cooling water,
5. Turbine room sump overflow,
6. Sealing water and
7. Miscellaneous leakages.
The effluents from #7 and #10 boiler room sumps are pumped to the ash
basin.
The turbine room sumps accommodate waste water flow from such sources
1• Floor wash water, as:
2. Condensate-feedwater system leakage,
3. Equipment cooling water and
4• Other miscellaneous flows.
The effluents from the turbine room sumps are pumped to the yard drain
sump and then to the ash basin.
Boilers#1-#6 have been retired. Therefore, the floor drains receive
o
waste water from these units. However they do receive filter backwash
water and reactor desludge water from the filtered water system. These
wastes go to the it sum and are then
Pit p pumped to the ash basin.
3. Chemical Cleanin of Boilers: Boilers #7, #8, #9 and #10 at Riv
Steam Station are chemically cleaned on a 3 (Boilers
#
are retired). The volume of the boilers determineshthelquantitylofs #1-#6
chemicals required for a cleahing. Boilers #7 and #8 each have a
water -side volume of 26,300 gallons. The volume of #9 and #10 boilers
24,900 gallons each. The volume of dilute waste chemicals discharged
#7 or #8 boilers during a chemical cleaning is 289 gallons. The
300 is
volume of dilute waste chemicals drained from #9 or #10 amou g d from
gallons. These wastes are drained through temporary nts to 273,900
to the
permanent ash removal links which flow to the ash basin. Immediately
RB -PAGE 2

RI
4
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
chemicals and amounts required to clean the boilers at Riverbend follows.
Chemical
Sod mui Bromate
Ammonium Carbonate
Ammonium Hydroxide (260Be)
Hydrochloric Acid (31.5%)
Ammonium Bifluoride
Copper Complexer
Sodium Carbonate
Citric Acid
Boiler
Amount
Boiler
#7 or #8
550
lbs.
1000
lbs.
900
gals.
4800
gals.
1500
lbs.
1660
lbs.
3000
lbs.
300
lbs.
Boiler
#9 or #10
550
lbs.
1000
lbs.
850
gals.
3400
gals.
1050
lbs.
1650
lbs.
2200
lbs.
200
lbs
Coal Pile Drainage: The coal pile at Riverbend Steam Station covers an
area of approximately 12.3 acres. The average rainfall run-off is based
on an annual rainfall of 40 inches with 50% run-off. The average runoff
is 0.018 MGD. The coal yard drains to the yard sump and is then pumped to
the ash basin.
5• Ash Basin Overflow: The ash basin at Plant Riverbend accoMmodates flows
from the yard drainage sump, boiler room sumps, ash removal lines, and
rainfall runoff from the basin watershed area. The average rainfall
runoff are based on forty inches of rain per year withfifty
run-off. The average rainfall run-off for the ash basin waterrshednarea is
0.261 MGD. The average flow from the
yard nageThe average flow from the boiler room sumpsdis�1.490sump MGD.�sThe2aver1age
flow from the boiler room sumps is 1.490 MGD. The daily ash removal flow
is 2 MGD. These flows give a total influent flow to the ash basin of
5.99-8—MGD.
Due to the construction of the outfall structure, the effluent flow is
essentially equal to the influent flow (refer to the attached schematic of
water flow for further information of individual flows to the ash basin).
Oil Storage Run-off: Riverbend Steam Station presently has two oil
storage tanks - one (1) 4,250,000
underground tank. The 4,250,000 al. tank gal' tank and one (1) 27,000 gal.
dike capable of holding the entire contents �ofstheotank. unded bThendiketi�sn
drained of rain water with the aid of a siphon arrangement which drains to
the intake. A trap tank is located in the drainage area of the oil tank
as an added precaution.
An oil storage facilities are presently covered under Spill Prevention
Control and Countermeasure Plans.
7. Intake Screen Backwash: The intake screens at Riverbend are backwashed on
an as needed basis. Normally, the screens require backwashing once per
eight hour shift for a period of approximately 20 minutes. The water
required for backwashing is supplied by a low service pump with a design
RB -PAGE 3

capacity of 800 gpm. Therefore, the average volume of water used to
backwash the screens is 0.048 MGD. The maximum needed is 0.960 MGD.
8. Water Treatment Wastes: The water treatment system at Riverbend Steam
Station consists of a clarifier, five gravity filters, two activated
carbon filters, and one set of demineralizers. The sedimentation wastes
collected in the clarifier consists of solids that were suspended in the
service water plus aluminum hydroxide precipitate formed as a result of
adding aluminum sulfate and sodium hydroxide. The average volume of water
required for desludging the clarifier is approximately 0.002 MGD. These
sedimentation wastes are drained to a floor drain which flows to the old
end pit sump where they are pumped to the ash basin.
There are five gravity filters which follow the clarifier in the water
treatment process. One of these filters is backwashed per day.
Approximately 15,000 gallons of backwash water are required to backwash
each filter. This water flows to the old end pit sump and is pumped to
the ash basin.
In addition to these gravity filters, there are two activated carbon
filters. These filters are backwashed once every three or four months.
The volume of water required to backwash one of these filters is 2,000
gallons. This backwash flows to the #6 and #7 turbine room sump and is
Pumped to the ash basin.
The set of demineralizers at Riverbend consists of two mixed -bed cells.
Normal plant operation requires that only one cell from the set operate at
any one time. Each cell has a capacity of 120 gpm,
Each cell is regenerated approximately once per week. A regeneration
requires 267 pounds of 66°Be sulfuric acid and 784 pounds of 50% sodium
hydroxide. An average dilute waste chemical and rinse flow is 0.004 MGD.
The dilute acid and caustic are discharged from the cell simultaneously
through the same header for neutralization purposes. The regeneration
wastes flow to the #9 and #10 boiler room sump where it is then pumped to
the ash basin.
9. Effluents from Air Pollution Control Devices: Riverbend utilizes electro-
static precipitators as its air pollution control devices. The fly ash
captured in these precipitators is water -sluiced to the ash basin.
Approximately 1.976 MGD are required for this purpose.
10. Sanitary Wastes: The sanitary wastes from the plant are treated by a
septic tank. The sanitary effluent is
Pumped
of the septic tank to the ash basin viathe
from the discharge chamber
Yard
on this unit is produced by a minimum of 109people aonaonesshift.ThBasedd
on annual data the average daily flow is 0.006 MGD.
11. Condenser Cooling Water: The condensers at Riverbend Steam Station are
cleaned mechanically. Periodically, rubber plugs are forced through the
tubes to rid them of scale or other deposits.
Each unit at Riverbend has two condenser cooling pumps. The capacities of
these pumps are listed below. The normal plant policy is to operate both
RB -PAGE 4

• � u
CCW pumps on each unit at all times the unit is carrying load. This
Practice leads to a higher reliability factor for the units.
CONDENSER COOLING WATER PUMP CAPACITY
Unit No. 1 -Pump GPM
2 -Pump GPM
4 45,000
5 45000 67,000
6 50,000 67,000
7 50,000 77,000
77,000
Maximum Cooling Water Flow 288,000 GPM
RB -PAGE 5
CCW pumps on each unit at all times the unit is carrying load. This
Practice leads to a higher reliability factor for the units.
CONDENSER COOLING WATER PUMP CAPACITY
Unit No. 1 -Pump GPM
2 -Pump GPM
4 45,000
5 45000 67,000
6 50,000 67,000
7 50,000 77,000
77,000
Maximum Cooling Water Flow 288,000 GPM
RB -PAGE 5

A
B
Condenser
Cooling
Water
C Intake
L Screen
Batkwash
Water Treat-
ment
System
E
Misc.
Equipment
Cooling
NFFlly Ash
Suicing
I
Bottom
4Ash
Sluicing
K Sanitary
Waste
System
L I Pit Sump
H
M
I Boi
er
Room
Sump,,
1 0
R
N Condensate
4Feedwater T
System A
P
Q
Coal Yard
Drainage
tormwate (Stormwater (2) Stormwater (3)
Yard V Ash
Drainage Basin
Sump
S
U
Turbine
Room
Sumps
SCHEMATIC OF WATER FLOW
PLANT RIVERBEND
COUNTY: GASTON STATE: N. C.
February, 1989

LEGEND
RB -PAGE 7
Plant Riverbend Schematic
Flow Stream
Avg. Daily Flow, MGD*
1.
Yard Drainage
2.
Coal Yard Drainage
0.004
3.
Ash Basin Rainfall Runoff
0.018
0.261
A.
Plant Intake
B.
Condenser Cooling Water
260.119
C.
Intake Screen Backwash
252.756
D.
Water Treatment System
0.048
E.
Misc. Equipment Cooling
1.186
F.
Fly Ash Sluicing
3.136
G.
Bottom Ash Sluicing
1.976
H.
Fan Floor Cooling
1.017
I.
J.
Misc. Equipment Cooling, Seals and Leakage
Miscellaneous Flow
0.188
1.464
K.
Sanitary Waste System
0.925
L.
Filter Backwash and Desludge
0.006
M.
Demineralizer Regeneration Waste Water
0.017
N.
Boiler Feedwater
0.004
0.
Boiler Blowdown
1.162
P.
Transformer Cooling Water
0.005
(through oil trap tank)
0.453
Q.
Combustion Turbine Cooling Water
(through oil trap tank)
0.106
R.
Evaporative Losses, Soot Blowing
S.
Boiler Room Sumps
1.113
T.
Losses to Floor Drains From Condensate Feedwater
System
1.490
0.044
U.
Turbine Room Sumps
V.
Yard Drainage Sump
1.014
1.224
001.
002.
Condenser Cooling Water Discharge
Ash Basin Discharge
252.804
5.968
*Flows are extrapolated beyond the scope of significant figures
in this table and throughout this
narrative to
variations in flow capacities.
account for
RB -PAGE 7

PART D
The following tabulation lists the hazardous substances located on site in
accordance with 40 C.F.R. 117.12 and with the legislative/regulatory history to
qualify for a §311 exclusion under the Clean Water Act.
RB -PAGE 8

LIST OF
HAZARDOUS SUBSTANCES (SECTION 311)
RIVERBEND STEAM STATION
POLLUTANT
Acetic acid
Aluminum sulfate
Ammonimum hydroxide
Hydrochloric acid
Nitric acid
Phosphoric acid
Potassium hydroxide
Sodium bisulfite
Sodium hydroxide
Sodium hydroxide
Sodium phosphate (tribasic)
Sulfuric acid
Sulfuric acid
UANTITY*
9 gal.
3000 lbs.
6 gal.
6 gal.
1 gal.
4 gal.
5 lbs.
8.8 lbs.
4600 lbs.
2 lbs.
2000 lbs.
4000 lbs.
4 gal.
DERIVATIVES OF LISTED HAZARDOUS CHEMICALS
Ammonium bifluoride
1.1
lb.
Chlorine (liquid)
1200
lbs.
p-Dimethylamino-benzaldehyde
(150
lb. cylinders)
Sodium hypochlorite (12.5%)
2.2
55
lbs.
gal.
Sodium sulfite
11
lbs.
(1) Water Treatment Area
(2) Demineralizer Regenerate
SOURCE
Lab
WTA (1)
Lab
Lab
Lab
Lab
Lab
Lab
DR (2)
Lab
Cleaning
DR
Lab
Lab
WTA
Lab
WTA
Lab
*Valves represent maximum quantities onsite and do not necessarily
reflect quantities discharged. Treatment of these and other chemical
substances to achieved by the ash basin. Refer to Item 3 of "NPDES
Supplemental Information" for a list of chemicals and amounts used
for boiler cleaning.
RB -PAGE 9

• Riverbend Steam Station 316(a) Determination
Duke Power Company's operating experience during the past five years under the
thermal limitations imposed in NPDES Permit No. NC0004961 substantiates EPA's
316(a) determination (May 1975) for Riverbend that the "thermal component of
the discharge assures the protection and propagation of shellfish, fish and
wildlife in and on the receiving body of water."
In Duke's judgement the operating characteristics of the station have a minimal
effect on the aquatic environment of Mountain Island Lake. Accordingly, Duke
requests that the thermal limitations imposed in the permit be continued.
RB -PAGE 10
a
• Riverbend Steam Station 316(a) Determination
Duke Power Company's operating experience during the past five years under the
thermal limitations imposed in NPDES Permit No. NC0004961 substantiates EPA's
316(a) determination (May 1975) for Riverbend that the "thermal component of
the discharge assures the protection and propagation of shellfish, fish and
wildlife in and on the receiving body of water."
In Duke's judgement the operating characteristics of the station have a minimal
effect on the aquatic environment of Mountain Island Lake. Accordingly, Duke
requests that the thermal limitations imposed in the permit be continued.
RB -PAGE 10