NC0004961_Renewed/Reissued_20090827

August 27, 2009
Ms., Charles H. Weaver,, Jr.
State of North ,Carolina
Department�of Environment and Natural Resources
'Division of Water Quality
, NPDES Unit
1617 Mail Service Center
Raleigh, North- Carolina 27699 -1617
CORPORATE EHS SERVICES
Duke Energy Corporation,
526 South Church'St
Charlotte, NC.28202
Maihng Address
EC13K 1, PO' Box '1006
Charlotte, NC 28201 -1006
x
Su_ bject: Duke Energy'Carolinas, LLC'— NPDES Permit Application
RiVerbend` Steam Station - #NC0004961
Dear Mr: Weaver:
Duke Power requests the subject permitbe renewed and reissued.- The�above
referenced permit expi'res,February =28, 2010. As, mandated by N'oith,Carolina
Administrative -Code 15A NCAC 21-1.0105 (e), this permit application for renewal is
being° submitted at least, 180 days ,priorto expiration �of the current permit.
Please -find enclosed in triplicate, theJenewal application, which includes the
following items:,
EPA Form 1
EPA Form 2C
EPA Form 2F
Site Maps
Water Flow Diagram
Supplemental Information
Duke Power requests notificat ion, that this application, is complete
Additionally, the attached report, `Assessment-of Balanced .and Indigenous
Populations in Mountain Island Lake," continues to indicate recovery of aquatic
populations and, includes a request to approve recommended monitoring ,program
modifications going forward. Therefore, this report also supports renewal of the
current thermal monitoring requirements';of outfall #001,.
w4v duke- energy.wrn;

The follow Iing monitoring red 'uctions.at outfall #002 are requested based on
historical ;monitoring data.
Total Suspended'Solids —reduce monitoring frequency from'2 /month to
1' /month.
• Oil & Grease - reduce - monitoring frequency from 2 /year to 1/year-
Total Copper — eliminate quarterly monitoring requirement, only moriitor
during boiler chemical cleanings.
• Total ,Iron - eliminate quarterly monitoring requirement, only monitor during
boiler chemical, cleanings.
• Total Nitrogen —reduce monitoring frequency from 2 /year. to .1/year.
• Total-Phosphorous —reduce monitoring frequency from 2 /year to 1 /year.
Thank -you in advance for your assistance .on this matter. Should you have,
questions regarding, this application, please contact me at (704) 382 -4309.
Sincerely,
Allen Stowe
Water Management
Attachments
cc w/: Mr. David Russell - NCDENR Winston =Salem R.O.
Mr,. Jimmie�Overion — NCDENR; Raleigh, N.C. (BIP Report 3, copies).
3
a
l

I
Al I en ,Sfo'w"e/fbgs�cdV-OeraDijl2 009-,
-bc-wlaftbchrnefits: 'Steve, Jones —,Riverb6hd-'Steam-,Stati6n,
, P6W hy!Stafford
. 11, , ,
bd w/o attachments- Michael,Abney
John DOMdff
Keffhfinl6v.,
'Ron Lewis
Debbie, MOO'
Terry Taylor
kobefi WvIi6,
,,RL-c6'fd Ntimber. ,248464 -
f ile Number: 8-6
Certified Mail: 70081140 0002 2718 4311
1

Please print ortypi in the unshaded areas'iinly,
Form Approved OMB No _20404086,
"FORM-
' U' S-ENVIRONMENTAUPROTECTION AGENCY
PA dE14Ek&,1NF0FkMAf1014
4-11
donsolidaled Permits Progrzim
NC00049'61
LABEL ITEMS
­—GENERArINSTRUCIFIONS
r1f a' preprinted label Chas been- provlde!�,, affix It In the i
idesignatad, space, Review the Informatfion-6ref6ity,,if any of III
Is Incorne cross throughth and inteF the sorr"Vdste in thei
'appropriate
AQD. WMBER,
fill-in area below; Aso, d any of the preprinted data
t13 absent the area to the,left, ot'lhe, label
ill.- FACIL'I7Y NAME
PLEASE PLACE LABEL IN SPACE
information'that shoufd'appeer), phissi provide It In the proper!
fill-in area(i) bel6w If I the label Is romplete,'and correct, y6u
need not complete llems, l. III, V,,'end V1 (except V1.5 whlcnF
must be completed )egardle33), Complete 1611 Items'llf no, labiO�
has'been provididjRefer to,ei'l4triietions-f(ir detailed 16P
descrlpli6ns irid for the i;gaI,autfi6nzitfcnCLuider which thk
data Is w11 cted=­-
WN6iRUCTIONS Complete A through J to determine whether you need to, submit any permit application forms to the EPA lIf you answer 'yes' to any questions, y
,6ubrndlthls form and the supplemental form listed In the,pirentheils fdllowlrtg;the question Mark '�X*41n tlietox in theTthird column If the supplemeMal i acWed '11-
-foinrris
you answer *no,t6 each'qUestion, you rte�id 66t i6brind'any of these forms' You may answer "no' ifyour activity is excluded from permit requirements-, see- Section C of-the:
Instructions See also Siction D of the iristructi6n�s for diflnil!1663 of bold-facid twins
­,SPEtIFICQUESTIDW,
C lFfd,.QtJEST(0N§ ---- I
�E&."
14M,
r
fWJA1
A=` Is this facility a publicly. owned,)trestment wot,16�whtch
results In adIsc:hargito waters Wtfie,U:S.? (FORM2A)
X
--- -
b666 `or 'will thls'ficility"(iither.exisonl�,-(5r-Oii5owed)
include a concentrated animal ,feeding operation or'
�'
acIittatic en6iia(proauctJion faclllty which results ,m al
disch rgq_tgWater6'oftkitLI5.?(EORM2B)
Jsl;
07
C is this a facility which currently results in dischill5irigas to
waters of the U,S. other than those described Irf A,br B
X
X JDAthis
a pr6posed facility (61her thah those blei6ipbielm A
OPS abovi),whkh Q11 -result in dis-chargii to w alteiri of,
NA
1?7M
the U.S.? (FORM,2D)
W11
-z"
�=T­
V
E treat.—store, Tor dispose`-of
!F Do,Ty6id Bilivill jbu- Inject 'at`tfiii-facildy'lndustnall pql
Wazardo�uilwaites? (FORM 3)
,X
municipal effluent 'Below the lomibrinost tirtralturn
coiriiairdrib, ti;rth�n one q6aher mile' of the well bore;;
-X-
U
underground iounceib-f drinking water? (FORM 4)
G Do you or'will ji5it'injiact'a11 lfiis facility any,prodticed water'
iH-D6 you oViAI1 y6-u'injdct"6t-th6-fdbih1j fluids for-spedel
'or, othir fl6idi which are brodghtyI(I5 thii surface in
inth
such as mining otsulfur,*, the Fras6h piir6ciss
processes cl"mintirals; In situ combustion of,fossli,
connection conventional oil or natural gas production,
Inject fluids used for enhanced recovery of oil or natural
i
fuel; or recovery of je6thermal energy?rl(FORM 4i
ydr6r
g -ariions?
gas, or inject-h6idsv16r storage of liquidin
--
-.
_0
­IF RM'�)
V
,- - - — - - - -- ­— t- ­- - ­=
7�
7�3i �
- - -
of thi,,28,';6dustn& 66t*rtes listed irithe instructions and'
J Is this, fecildFii"VrcWs6dsiiti6nir sou 4ce-which-is
NOT one of,the 28 industrial categories listed in the
�Nil eirill 100 tons ftir'y6ar-of's-ny' air
instruchons end which will potentially 4ind i0loiis per
which potentially
pollutant regulated under the,Clean Air, . Actarid,mayeiiect
year of anyTe - it pollut nt I a regulated under ' the Clean Ad Act
or be located'in an attainment inia?'W6AMI�)
and may affect or be located In,ar attalnmentareii
(FORM PRI 5)
III.- N ME-QF rACIILIF:,-j
�
P%'
I, 1,� 1 1, ',1 '1 I-I'l. 1 1, r".-I
Stea.Stat-i, on
Rive iin
WJW�- J'Ab OTY­,C DN ACT
A NAME,& TITLE &Lahe)
_PHONE (�reii c6de & nd -J'
—
Scientist Env: p,." AlS
7VOV 3 2-- 4 S OV, ( -
iF
40 lOr- 10"
1,
FACIL-Ty-M6,ILING ADDRESS
A STREET OR P 0 BOX
box-
40� Is
D.,ZIP CODE,
rlotte
C,
2 2 1
V1. ACILITYtOCATJON,
A'STREET,,.RoL)TE NO 'OR OTHER`BPECIFIC IDENTIFIER
761
[1- 5 eam 2YarnJAJd1a1d,,! I I '11 11 '1, 'I� I
NAME_ _7
4'
4O.
STATE"
" --E. ZIP CODV'
M151
U Y�
LLL'
kLJ
I
Its
;i
EPA FF6rm 3510-1 (8:90)4 CONTINUE ON REVERSE

snxpm*mm0^m-,9m'--- - --- -'---- ~ - - - --��---`'
MTOURTH
8,13 ftridnin fislad In Item
0 YES ONO
LL en, St6
to
ERAL
P PRIVATE
p T 1 7,
Is the facildylocated on Indian lands?—
ij
nA
'I certify �ndsr perralt� of law that I have personall� examined and am famthar'with'the ififormab�n subrim"ited-in this ippl�c_ah�n and iffettachments arid,theti4ased onm�j I
Fossil Stations
11, Regulated
COMMENTS FOR'OFFICIAL USE ONLY'
it
snxpm*mm0^m-,9m'--- - --- -'---- ~ - - - --��---`'

+tiT 1z 2��� . i i ♦� I 3.
N
�) f . j rf`�' k r / ;�1j?;`,� }~ + 3jjt }y �y^1 + Y �''4 �i ♦ ' �J r , }� Jtv
J rr� �if ( :._''t: "` " •:A. t:zl$3���,X' +.) fl % J �' \ +' t �+w.T
i
' �� i1J' t, ♦� / �` �1 4 tea., g12,i .J tt a. �♦ `tt � /',�.
""" _ Wik,J bC" ft • L J'° '1 , "I t�t { �,..•,.' by yl�
ii' 1/4 • d �.�r JSY � LL.. i a. /`.,� r�r I 1
'"jN�y� •i f° '� yT. � � /�'�" +fit �'��n, •r(I -� '•'J +' ' ��I��+ r... � 'n
,K 3.+lig^.•n' (�♦. �_ sJ � gip. t > 11 �•� � � � ,�, a'/��'a♦``... : S '����E.a�' �,. J'�
^t♦^"
DiRECTi6N
DUKE ENERGY,: i a
PROPERTY, ONE,,
-�
r 0 W
r£GX J�J�.r . �•
RIVERBEND'
' t ST�E+AIVi STA'T`ION �„,,.„ ; >' j `-�- w at .•-
Ia t1yJ7?r ✓ ^� X it:P V01
to
a
`fir �'. 144` a+ 12j.. •� t �~ �,`
REFERENCE: Q Q.5 1
BACKGROUND DATA: USGS TOPOGRAPHIC QUAD, MOUNT ISLAND LAKE AND LAKE NORMAN SOUTH
f7AD 83, METERS WAS OBTAINED FROM NC ONE" GEOGRAPHICAL tNFORMATION (Gig) WEBSITE- Kilometers
THE PROPERTY DATA WAS OBTAINED FROM THE GASTOV COUNTY NORTH GiR"AGIS OEPARTMENT.
PLEASE NOTE THIS DATA IS FOR INFORMATIONAL PURPOSES ONLY. IT IS NOT LEANT FOR DESIGN, LEGAL, 0 0,5
OR ANY OTHER USES. TN ERE ARE NOGJARANTEESABOU 7 ITS ACCURACY, ME, INC—ASSUMES NO
RESPONSIBILITY FOR ANY DECISION PAM OR ANY ACTIONS TAKEN BY THE USER BASED UPON wNNNNwwMNN======= Miles
LNFORMATION OBTAINED FROM THE ABOVE DATA
AS SHOWN LOCATION MAP FIGURE
ATE: 06-08 -2009 Duke RIVERBEND STEAM STATION
RAWNSY: RDp NPDES # NCO04961
ROJECTNO: ►i Eer gy. RIVERSEND STEAM STATION
1411.08 -140 GASTON COUNTY. NORTH CAROLINA A

-1
2
EPX I D NUMBER'(copyfromlienil-dfFor)F Form Approyed.
OMB No'. 20413 -0086
IIC000491 6
­.h.A.A . _. I Xo'6rovatexpires 3-31-98
-foRM _ S'ENVI!16NMENTAL PROTECTION AGENCY
U
APPLICATION FOR PERMIT TO DISCHARGE WASTEWATER
EP
A EXISTING'MANUFACTURING�COMMIERCIAL, MININGAND SILVICULTURE OPERATIONS
Corisialidated Firrhits; Program
IjOVTFALCCOCATIOW
-For.each outfall; list the lafflude,and longitude of Its,location tOh nearest 115 sewnds_hridl the name of the receiving water'-
A OUTFAi.L:NUMMFt,'_
At)YVDE
VOW
T ?.MINI
JMountain Island Lake (Catawba River)
_35
'SO--
Mountain Island Lake (Catawba River,)
21i
_49
Mountain island Lake (Catawba River)
II _FLCWS,-POURCES OF POLLUTION; AND TREATMENT TECHNOLOGIES
'A. -6f Intake water,,60rations-ciintH6ugni-wasteviate(t6 the WWrit,,ond treavridtit units
�Attach aline drawing showing the water flow through the facilftj Indicate'96ur6di
water
labeled to,c6ftspond to the more descriptions IhAim B­Cbnstruct i'water 6aiini;i on the [[no drawing ti'y showing average flows between ihtakei, operations,
treatment units, and,outfalls Ifawater biilla6cixa66t1e detirmifitid_(i g, for Gbdam mining activii;6-S), provide a pl6tcinall descii0iin of the nature and amount of any
1 sources of watir.snd any collection oflreiti&k riiediuisi'.
'Foi,eich"butfall,-provide-a description of -(I) All operations contributing wastewater to the,eMuent,'Indudlng process' wastewater, sanitary wastewater, cooling water,
and storm water runoff, (2),The,aviitagle flo%Vrontributed by each operation, , , ondf(3) Ths*iiiatment,reciived by the wiFstewster, C66nZie on: ddthonal_,sheets1f,
1,,OUT-
Usi
.FALL-
OF
`TA4).Ek�f
002
CondeMaX Cooling; Lea
go to tace water
002
4 4100,
Yaid-Sui-pi EmeFqency Overf low
-7-7
r --- 7
J
L
7
177
AR
'PAGE 1, of 4 CONTINUE N E.
EPA Form'35 G,2C'(8 �kF 0 REVERSE RSE

,,,_Za i,1~=,,"=COMM
PAGE2 01`41- CONTINUE ON, PAGE 3
�
|
(
/
i
/
�
NO (go to Section 1,U)
DAYS PEF�
--B TOTALVOLUME
002A See
_�p
WIND (jo to SicoonLV)
e- oflproducflon�xpres he:
owf.11 numhAs)
c OPERATION, PRODUCT, MATERIAL, ETC.,
IV IMPROVEMENjk-
d mematI ujigieding -&6peratlonji bfiAwtdivsterf,
h as
r rd at
7
7e777�,
77
CO
N OF PROJECT
DESCRIPTlot
r ETC
MA PA
OPTIONAL -You rrfiy, attach -addittorial'isihe6ts -dvibnbir�qlqny bilditional water- pollUtion-contml- piro0mg'(oF`bthdr enwibrimantal projects-which may. eff6c your.
dtiqharg�s) you now have underway orwhich you plan indicate whetfiir each-orograrKii now itridd4ajor planned�,and Indicate gour actual 6f Olanned s;h-edul6sfor'
__ E]_MAFiK-)�_1F DESCRIPTIONIOF,ADDI`TIONAL CONTROL PROGRAM
PAGE2 01`41- CONTINUE ON, PAGE 3
�
|
(
/
i
/
�

EPAd D'NUMB_ER (copyjromimm l ojForr i l) $ €
W
Cr]NTINI Irn FROM PAGE 2 NCOOO4961 il
i y: lh tAlfE AND EFF1UEMl'" 666 B, ,}
A B; & C -` See instructions before proceeding ---Complete one set-of tables for each outfall _ Annotate the outfall number In the spaoe provided,
NOTE Tables V -kY -B, and V -C em inciuded on separate sheets numbered V -1 tKrough V -9 - f
D Use the,space,below to list any of the pollutants, listed m`Tabie'2o3 of the' mstructlons,,which,you know or!have reason to believe is dl§oharged,or niaytbe,discharged'
x from any outfall For every" lutant ou Ihi, b6h descnbe the,reasons you believe d to be present end ieport eny_analykcal date in your possession
J 1, POLLUTANT
2 SOURCE,
I POLLUTANT,.
2, SOURCE
For identifcation of Table
2c =3 substances, see attached_
supplemental information
I
t
'
t
i
tFk
i
I
r
IT
1
Vii" POTENTI A(OiBCHARGES�NOt,bOVtkED °BYANNAt *,816
is arty polluterit listed in Item V -C a substance or a component of a`substancewhlch you cunentlivae opmanufect4ii as an Intemlediate or final product or,byprod-uct7 ;
YES (llarall sdch poNumnfs below) _,y m,NO,(go
I
i
f
E�
e�
}I
.I
.. E
i'
I
r
N
EPA Form'3510 -2C (&90) PAGE'S of 4 CONTINUE ON REVERSE

k
r•nkl-rikll IC6 t:PnjLA,TWg: rpnmm -
VII. BIOLOGICAL TOXICITY TESTING DATA -j
Do you hiveany lknowl6dge-or reason td believe that any -biological test Tadeonany of your discharges of on a recetwng water In `V
ielatidn'io your discharge v!M n the last 3 jeers ?,
(s) qnd de--be their purp��st�.� "11�v) [:]AQ_(pR SeSttn P71k
[ZYES(1#n,,fyhe-1.1- j�
�ichrcrii`6' ebRicity t'ests �afe cc;hducted quarterly j?e�r,callendar year'on NPDES outfall, 002. These tests use*
Ceriodaphinia as the --test --organism. - Tes"t—re'sults indicate, that the discharge of,outfilll,,is non-toxic.
VIII CONTRACT ANALYSISjNFORyIATJCjN
Werea`n'y oRffjeE-�Walyse--s� reported - in' lte--r-n--Vjigilorge7d by a contract laboratory or consulting firm?
YES (list the name, address, and telephone number of'aridpokutants analysed by. ❑ NO 1. Se,1,0. LY)
each such labdralory arfirm below)
,LNAME
B ADDRESS
'C-TELEPHON E,
(arqd��e & nd)
D POLLUTANTS ANALYZED
(40,
Shealy Environmental
106 Vantage Po nt Drive
803-7917:4700
' All parameters except
§eidIcee, Inc
W69t Columbia„ SC 29172
dioxin and radiological
sGS Environmental serviceo, Ind f'5500
Budiness Dr
910-350 1903
pioxin,
Vftliingi6i, 146- 28405
GEL Laboratoriee LLC
2-040 Savage lzqz�d
SC' 29417
843 -556 =8171 -Radiological
lX,,CERTIFICATION
lee"urFderpe fty of law that this document and all,attachments were jorepered under r* diiihciri k�th a system designed to assure that
penalty
;quakfiedpersoiiniljp�'6 gathe'r,ai�d:eialOati'the,,intbrmaboh subrnitted Based on r�yinquirycCfhe-pets-on,orpersons who manage 6-ejyitem*oi those persons,;
diri6tij responitbld for githimni the nfornaton, the inionnstan submitted is, to the best ofpy knowledge and behefjiti:accurate, and,cdmiieW'l am awirethal lff6ii
a re S# gn &0 n t penalties for ilutifiv thn g false in fqrtna tfc;W� triclu di �9' the po sitbility of, fine end i *i fs6rinie fit fbi kh 6 win b, Ki 61a hop s
'A NAME& OFFICIAL TITLE (type orpruir)-
B' PHONE NO j(brih code & no)-
Terry L Taylors- General Mgr II, Regulated Fossil Stations
(704)- 263-3204
,C SIGNATURE---- ;D
DATE SIGNED'
EPA Form 3510-2C (8-90) '14 PAGE 4 of 4

VI
2 -
Or

Rj
c
c
2
rT
m r
M,
Mt
C _D
o MIZ
Oro
0
co
-u
I z
ur m
Z c
,z
to
Z
0
o
A
CD
CP
Z-3
cr
z
CL w
63
m
0
2
0 X
had,
Ill
m
I f
-3
14
c
rn
X, 0
5
CT
49,
� )
1
36'
a n
IVA
'50 tv
R
m I Cx cr
FIR
cr
=0 car
7*i
< 0
9—
Ff
J
at
IC
it
ul
at
m r
M,
Mt
C _D
o MIZ
Oro
0
co
-u
I z
ur m
Z c
,z
to
Z
0
o
A
CD
CP
Z-3
cr
z
CL w
63
m
0
2

rT
■
'1V
>4'
X
A
A
1�
9
6
3.
t
1
.7
t
zv
I
31
ut
I _A`
A-c
CA,
CA
00
SV
■

`
`
'
!
�
^
/
|
�
�
�
�
`
'
`
` .
'
5A
P"A
6
A
I F
th
N
-
11
:
ol
uzf
XA
ME
1 91
Wil
Is
lE
ark
C5
a
�-
IJ.
L,-
' ^
/
NEI
! l
/ .
|
CL

,<E
ly
m
J'A
TA
P
IK
, x
, Ji,
v
:-
dwi
A
,A
A
IA
IA,' 3
A
A,
A
W
t
t
-4
"tj
LL
m

9
I
z
c
m
0
6
0
z
C
m
0
,-n
X
0
K
M
G)
m
I
f
M.-
2
rT
:p
111"M
r5:
zo Z",
7-
MX-
x
'x
x
Ix
XF1,
fij
T
4
hx.�14!
Sm
A
A,
i-v
,
6
0
z
C
m
0
,-n
X
0
K
M
G)
m
I
f
M.-
2
rT

m
9
ru
9
Z
c
Z
RM,
7z
-1
rr
A -
tAi
A,
'A
A
;A
A
A
FAro
A
41
a,
'al
ar
et
m
Cz
BY
it
f,
�
'1
t ` d
u,�' E
jj-
� '`';
'_
� i
e ` -
1
I �
Y ; �
_
f'
�
II
.�
s�
Lu
I
'A
A
A
roA
111
'A'
A-
A
A,
f A
O
O
JIMMA7
tD

5
I
C)
0
Z
Z
C-
m
a
-n
;o
0
0
11
Z1 �j I
,
01 1 !
O;.
I
th
0)
i
t
i
IF—
in
31
J
z
A7
TS
If
9c
E, Ak
1, 0
ja
^i^
t
„�
[ t �
"
i j,
%�
syNr
a '
i
A
Ili'
�'
+t
.�'c
�
(
ki,
A
A ,
h A
if eO
1.
1
94,
- - -k
A}
A
A
1 A
1�
A
-A.
A'
A
A
A
A
A
A,
A
'
If
c
Xv
y
7
f
€
C)
0
Z
Z
C-
m
a
-n
;o
0
0
11
Z1 �j I
,
01 1 !
O;.
I
th
0)
i

1
rt
;9
OR
5
HE
3 3 Z;
x
->i
I
F-
4,
0. A
A
I
I
-1
t
7;
J
J
I
R i
41.,
-
L-1
d
rl
,n
'n
r
4
INN

m'
D
of
D'
_ bf"
t
D
- I
t '
E
Z �
J
Z
T
p
T,
G
i
1
it
1 a
f
E t '
Z il?D
Cs '
:x
v �
i
0 1
p
0
m�
O
� �
_"`•Q�y'
^-�f
iw �9{
..
.+ �,.�
�i�pT
yy,f r t'�!,
�
• ��ti�
%R
�
.iii
-
.�
�
<.•,,,,,
-
___
f�
T
f
�ii3
t
1
_
_
- a.m. -x
..,�
-
�- i
_
- i
^
[
,$ '
'•'I,
S,
;
Z �
J
Z
T
p
T,
G
i
1
it
1 a
f
E t '
Z il?D
Cs '
:x
v �
i
0 1
p
0
m�
O

I
Z- 61 MO
ESE,
0
Z M
-T;
rn Z
:r
M,
go
SO
fD <
0
Z
0
m 'n
m
Z
ad
3.
We
41
lv�
4i
V J,
74
Ll
4,
R1
a 0
Ay
-94'
of
)1',
�A
A
p 13z
it.
c
.a
—A
0:t
TAX
ME
all'
I
Kw
17�
�<§
1C
_711
-4
1
r
Ali
Zi
Or
to.
Es
fly,
9
Im
Z- 61 MO
ESE,
0
Z M
-T;
rn Z
:r
M,
go
SO
fD <
0
Z
0
m 'n
m
Z
ad
3.

9i
m
z
.c
m
rn
rn
Ni
m
111V
M
IIS
411� 1
if
^I
OA
16,
A
'A'
A"
I
A,
A
11
A
I
"P L
I
IN
-'3
4,1,
Elm
IT
If
Ni
m

it
!2
;D
I
Z
C:
m
0
Z
M
rn
I
0
Z
c
m
0
-n
;D
0
O
M
w
0
.r
�n
0
lei
Z' w
A i
Q'
M
ti l
CL
Cat
U)
9`1
0
g"I
w J kj
1A
'I
if
J;i
nE
11 A,
4'
.1-1
A
' A
' A
T F
all
C,
fl
O� 'CT P
K' a
Vj-
pr
ri
ji
1,
-C --3
"5v
F
141
g�
FOB
J
4'X ;-a
1
.4
4.
4-
4
1
w
gli
t.tV
TZ
im�J*
T
f
M'O
0
Z
c
m
0
-n
;D
0
O
M
w
0
.r
�n
0
lei
Z' w
A i
Q'
M
ti l
CL
Cat
U)
9`1
0

S.
z
2
c
rr
c
ff
ff
I
M
cn
Pjl
A
A,
Oz
it
:Tn
M
cn

2
c
rl
c
2
rr
0
0
m
0
O-n
C)
m
I
'_f Q
Ik
Fit
CL
in
t 10
gli,
&
A
--A
'A
A
s A
A'
'A, i
A
!A
-w
"AL
A
A
44j
fl
ji
io
7�
T
got
-L--
"
L
I m
r
0
0
m
0
O-n
C)
m
I
'_f Q
Ik
Fit
CL
in

WA
ip
"01
sp
z7f
2-41
Iv
-1
INK_
le
A
2A
A
to
0
�
jr-
4-0
It
rn
j
it
It,
it
EA
1
CAI
dk
E
CO)
101
O
ti

N.
rr
'Mll
-x
,I
4
,
X 1
X
'XI
�>�J,
X
1 X
I X I
>C
X1
-A,
A• ,
A
A'
A,
A
'6
4
A
A
to
•A
'A'
I A
YON
A
4 j
4

o
N ,.9'
it
-7
;l
-k
r
TX
IN,
Z,
P'
•
M-M

m
`
I
�
�
n
x
rr
Ti
�
n
n
�
"
-777
77
Ti
�
n
n
�
"

J`EPA ID Number (copy froin'dein 16f Form 1) Fohrn j�(Opfoved,OMB,No 2040:.0086
,.Please print or-type,in,the unshaded areas NC000490 Approval expires 5=31-92
United States Environmenta[Tjojebtion�Ageficyf
Form;
Washington, DC 20460
2 F Application for Permit to Discharge Storm Water
E PA
e fth !riidustriia
1 iPQ S Disphar"e 4ssociat d w I
Papdrwork'Reciuction Act Notice
rig
en for this application is estimated to average 286 hours per application, includim PT�e for-revle�-w khin§6&tng,dat4-
needed, and corr isting ppq re�yiiErfig "'collodion of information. Send:dornments pqg@-!q"'the burden estimate,
_p . -I " - ­
,
rm,,lndudpg �puggestoris which may Ina6a'se'or reduce this burdWto. C4,
i
SW, Washington, , DC 20460,'or Draclor, Oflice of In1bmwi6n and Regulatory
T
F&e 6�tfdjist the latitude, and,16ftit6de, -1 jo'-to the nearest 15 seconds and.the,name.-vitthe�,recelving Water.-------
It Ouftli Nunrii6ier
D Receiving-Water
.,A�: -'-fist
ISM011
'397, I 1,80-
:1
41
Mouiritain, Island, Uke,
—dL
SWl1df2
3S_
-21
491 F80
58,
1 :31:
7 1 K 6 ii r i t a it j7p to i I Lake (Pe b wh i I:- R ti T ii
_ ).,
SINVOI
3513,
- ------
211,
11 -, , 29.1 -
—80"
68
3 2
M -hiffind Lake (COM"aFRNO)7—.
ouhtdifi,
Wa I 1,'oibfft1M
ot hi Pufpoa7os,s MeabbveoutfallslroprtK�itntOtltr6,,,of,,the.re Mi"W
, Note: -For,
--T IV
Amorilive htk
I rA.--6reydqnovv re uded bVdny -F6der5l,-Statii-,�§F'1(5c-iii—auth-c�rity,-to meet aji-y- implementation, schedule for the construction, upgrading.br,
q
'
operationW wastewater treetrrfent,equipment or practicet'6r ginytothdi�envitbnmehta,l"-'--'----
programs w i
which may affect the digchir�es� d4critied
in this., application? This, inqlqd@s, O knot limited to, permit condib6ns, administratiVe or enforcement orders, enforcement- compliance
schedule,littcirs,sti ufati6n§,-cWrt-orders,enid-giint6ri-oin,concfitions ----
4 Final
-PAecL
•Co?n`tlanoeDaie
brief. Description' of
—a.,
MIA:
7T ---J
Bi; You,may attach additional sheets;dFascribitig, any a6ditforial Water pollution (or other ggy:irbrfmd7nte!°o-(ejdcts,Whlcb-,may,,-Offw,-yotFrdischarges)
,you, now have under way or which you plan.. Indicate whether each program is now under way or planned; indicate jo6ir,icttiai or pliiniibid
sch6dukm for construction,, . . . . ..
. ........
I 11-3ire- Maiih .
- - — -bytheo I utfall(s)6overed in tM63,a0pflcaIIo-n-3f;-Cr-
I,AMC�',,a site map-showing,,t�oobraphy, _!ng the ddtiiffe�of'drainij6�irdiis�sb'Ndd
-(6r ih-dicat
16pogeaphic map Is unavailable)- d'e-including thet facility- including, each of as intake and discharge,structdres�,;th`e 6iinaje,area,of'ekVitorib
'igt`
br,p- 6t areas used for
water 6utfili, paved areas and buildings within the drainage, area of,eich storm,Qitir 6#all, iibii known p rase -
outdoor storage or disposal of, signffi.qqnt mitenils, each eiisting structure control measure - tbjediice pollutants in storm water1urioff,
mitenals loading and access areas, areas wheri��s6&desjherbicides, sod conditioners and fertilizers are applied, each of its hazardous
i
- t� treatment; ment, storage or disposal units (including each are not'required to have a kCRA p er mt which s,used'for accumulating hazardous
waste undir 40,CFR 262-34),,iich, well where fluids,,from the facility, are,injected underground, springs,_ana otl��surfacerwater bodies which
EPA Form,3510-2F (Rev 1 '-92) Page I of 3 Continued on Page 2

" 4 �YFcpN , V ;F.
:Contihued•from the Front
:I Naf ve also ri iloit riTpa titatit Sato- =.I
A ° For each outfall; prowde an estimate bf.the area (include units) -of Impervious surfaces.(mcludmg paved areas and budding roofs)'drained= -
,to'the,outfallM1antl an,e`stimate of the total'surface area drainkb'_the,outfall _
-Outfall
Area of Impervious Surface
Total Area Drained -
Outfall €
i Area -of Impervious Surface
Total Area, Drained!
_Number_
__ _ _ _, vide units _ _ J
__ rovide_umts _�____'
Numbers
__- rovideaunitsl _ __
- provide units ,
SW001
(~ See attached
supplement infonnation
SWO14
Provide a narrative °description of significant matenals- Wat'are`currently or in the'pa"st "three years'have`been- treated, stored-or dispose-d--
- in a manner, to allow exposure to;storm water, rrietliod of''freatment, storage,.o'r disposal, past and preeent,matenals management
praciiges employed to minimize'contact by,fhese,maferials with storri ,water runoff, matenals,loadmg and,a"ccess areas, and the.locabon,
' __- _ manner and freauencv in which pesticides_ herbicides •soil conditioners and'fertihzers are, applied.
,See attached su_pplementrinformation
I
ip
j
IC ,
i�
I C. - For'each outfalli, pro"vide,the location and a descnption of existing structural and -nonstructural control measures -to- reduce pollutants in
storm water runoff; and'a,descr$tion,of4he` treatment the storm'water'receroes, iricludirig the `schedule and type of maintenance for
control acid treatment measures and the, ultimate disposal of, i -solid or_Nid wastes other, than by discharge.., ..
autfail.
- -
'List Codes from
i Number;-!,
_ __ ___ Treatment -
Table 2F�i _
See attached suppiement4riformation -
; SWO14
-
- A ' -' I`aeertify under penalty of law that the outfell(s) covered by this applioaUon tia3e:Lieen'tested'yor evaluated for the pTesence;of" '
nonstormwater discharges;, and that all nonstormwa er discharges from,these outfall(s)_are Idenpfed in either an accompanying F6ft 2C
_ or Form 2E a 'lication for the outfall
Name.of Official Title (type or pnnf) =
'Signature
Date-Signed
Terry L. Taylor, 'Genera/ Manager Il
//
aRe Llated`Fossil_Stations__S
W
`B'—Prdvide-a--descnption of -the metiiod used, the°date`of-an sting; nc the-onsdeL -inage oints that were directly; observed during a' -
test
,,Visual inspection wasperformed during November 2008. Every" identified outfall wasAinspected after at least ,
72 hours•of dry, weather to determine 4f any °Water was'flowing Within, the outfall. `
r,
-��- - - - - - -- - - -- - - - -- -- - - - - - -
. Vt :•;St "iiificantCeatcs ©rS�ilts
i Provide existing inford ation regarding the history of sign cant -leaks or epols9of toxic or hazardous pollutants at the facility-in the last`three
ears,'includ ing 4he,approximate date aniiIlocation,of the, s'ill�& leak,.and,the type and 'amount of rrrateiiaGreleased
Within the past three years, there -have not-tieeh ant'significarit spills of hai6`rdous- substances4n excess of
! }reportable quantities set forth by Section 31:1 of the Clean Water Act or -Section 102 of CERCLA. AM
rs ignificant 'spill,incidents,shall be logged by the Environmental Professional and the necessary,,updates shall
hbe made to the various related plans and "procedures. All environmental incidences at Riverbend Steam„
`,Station are stordd for'review in the station's Envlronn ental Incident Database
5
k
EPA Form 3510 -2F (Rev 1 -92), 'Page,2fiof 3 ,Continued omPage 3

EPA ID Number /of Form 1):
bpr (copy from Item
Continued from Page,2 WC0004961
V11. DiS_chaffge.,1fff6fffia_fl6n_-
&B,C,&D See instruchoh,beforeproceedin-9 --Complete, one set of tabl6t foF-6-abK'ouffall':-An—notiiteth67,c- utfilI number Jr f the­spAb6­proVlded­-,
Tables ViFA, VII-B, and V11-C are included on s6parate'iheets numbered' 114-'and Vl 1-2
E Potential discharges not covered by,amlysis%ii6 -any toxic pollutantlisted'In tabje�2FL2, 2F-3-,__0r 2F-A,16-substance ora-'componentlot, a
substance which yowcurre, y't se— T Aa` n ufactviei is an intermediate or final product or b _ y-pygduct?
Yes (list all such pollutants below No (go to SectionIX)
t
Mill. Bidlbg 16ii-ToxibitY - Testing
K—Made"on any-or
Do you have_any,kriowledge-or reason-to believe that a!iy,b!olpgtpp test,for•acute^b-r, chronic toxicity had-bee your d19cha-r§e­s or
a receiving %�iier in relation to your dischargi,withip-the last,3-years
below) ® No (go,to Sechon IX
Yes (Irst all such pollutants
Toxicity testing has -been donductdd-dWthb WDES,wastbWater treatmeritdisi:hargeduffafl,002. But not on
the stdrm,watek,otitfalls.
'IX. Contact ana1YsirWf_orRiiW)n_,__'i
'Were any of the analysis reported in,it&rrf V11 perform6d'by a contact laboratory or consulting firm?
yes,,(hsM I he name, address,�di7d,telephone=iiur ib`er of, andlpo6tants No (go to Sectloh)0
anal yzeai(V each suchllabora(o T or below )
A Name-.--
L _-B ,Address , .9
_C,XreaCode & Phorfd'No
D Pollutants Analyzed
'­
Pa&iA`hA1ytid_a1 Sbrvices�. Inc
'9800 Xinc Ave Suitd 100
704,875-9092
011&Grea4iW
Organic
HuntersyMp, N628078
11 Pace�Analydcal Services, Inc
N2225,RiversideDr
828-254-7176
Ai6eiilk NC 28804
Wet chemistry- &
metals
IX. DEOtification
certify und& penaltV of law that' this document and all 'dttadhme'nts, were prepare un er my` direction or
_
supervision in accordance With a system deitgned io assure that,qualified-personnel'properiy gittieripnd evaluate
'bmi#dij6.jsed'on,rr?ji-inq
r' of the person or persons who manage the system.or those-persons
th,E�jnfo matldn7s(j UIIY
directly responsible I e for gatttering the Information, the- information submitted is, to the 46§t-6,f my- knowledge and
belief, true, accurate,, and complete. 1, am,aware that there,ar& sign►cant�penalt►es forisubmiffing'f6ise, intorrr?ahon,
includin the;posslbiiityof'fineand_'tmprisollmontfor.-knowing-vlolatlolis
A Name &-,0Wiclal Til:16-(type-orfinnt)
b_We6;Cdd16 and:Ptfone,No
Terry L. Taylor, General Manager I/,, Regulatqo'Fqssfl Stations
(7 _-04) 263-3202 02
C Signature
-D-Date Slg
EPA Form 3610-2F .,1--92) Page Tof 3

EPA blNumber (copy.from Item°hof Fomr71) Form-Appfoved OMB N6,2040-0086
S.WOA1 NC0004961
i Approval'expires 5131-92
_
.VII-,Dischar a lhformation , ,Cdhtlnued�from a e 3 of,Form 2F - ,"' ------ - - ,;,
- Part A-- You -must provide tKe,results of at least one`analypis for every pollutant; in this table Complete one table#or each,outfall-"See _
mstructioris,for additional details =
EMaximum Values
Average Values""""
Number
Pollutant
i' Include units
Include units
Of
t Arid
Storm
Grab Sample
---
Grab -Sample
= -
CAS Number'
;{ Taken During
,Mrst,30
Flow -weighted ;
, Taken,Duhng
Flow -weighted rl
Events
-
(Wf available) "'
5 Composde-
Composite
Sampled'
„
---Minutes-
Sources -of Pollutants
' `Oil 8"Grease
<�5.0'mg/L
° N/A'
N/A
%
N/A
17'
- -Se 'Supplementai
Information
j Biological`.-- ` ;'
13:0"mg/L
- N/A
J N/A __----
-NIA---- _,
___ 1-
Oxygen Demand 1,
j
'#
BOD5
Chemical----_
--<•25.
N/A 3
N/A -----
--N/A--= •
- 1_-
,__,-_�-- - --..
Oxygen,Demand '
mg/L
I
s,
j
(CO
--Total
29.3 m %L
g
; N/A -
N/A
N/A
1
Suspended
'
3
Solids SS
Total
; 3:9 ►ng/L
N/A
- N/A---- -
N/A.
1
ro en- _ _ _ _
fI,,Phosphorus
Total
0.53-mg/L
I - N/A
:N/A
, N/A
pH
Mini"8.6mum �'
Maximum !
Minimum
Maximum
-Part B-"I-List'eacWpollutant that,isxllmited,rman effluent,gwdellne,whlch,the,faahty,rs sublect,to,or any pollutant listed m;the"facdity's NPDES•
permltforrds process"wastewater (itthe facddy'ls operating under an ezisUng'NPDES permlt)'Complete one table for,each outfall
See,ttie mstructi6ns';fora8ddional details and uirements
Maximum Values - - -
- -Average Values —
-Number
Pollutant
include units
Include units)-
Of,
i
And
Storm
Grab'Sample"`
<;
Grab'Sample
-
CAS Number
Taken During
Flow -weighted
Taken Dunng
Flow -weighted
Events
(ifavailable)
First 30
q 'Composite
First 30
v Composite
Sampled
`Minutes
_ _
Minutes__,
_
_ �
u Sources of Pollutants_
Ammonia (as N)
1.7 mg1L
N/A
N/A
N/A
I
See Supp/eme'ntal-� ' '
Information
"'Nitr-ate=Nitf f tee
J -�
13 m V "
`-
`� N/A ` '�`
= =N/A
as N
1 Aluminum, Total"
°0:915 mg/L;
' `N/A
-" N/A" `""`
K" " -N/A"`
-1 'T-
429-90-5
Barium;.Total -
-' 0.0339-
r - NIA----
_ N/A
--'N/A
- 1
f
_ 4�0-39-3 ,
m /L
Boron,-Tdtal- -
0.0795 j
N/A
N/A
~N/A
1
-
" 440-42-8 _
Cobalt, Total
<0.005
N/A
N/A
N/A
1
"'
440-48-4
m /L
_
Iron, Total (7439-
'2:00'mg/L '!
N/A
I N/A
E` N/A
.1-
f_89-6 -
~-
- -'
I Magnesium,
1.7 mg/L
N/A
,N/A
NIA^
1
-Total 439t95 4
-
Manganese,
0.0784
N/A_
N/A
N/A
1
i'Tofa't
mg/L
i
439-9975
- — -- - -
-Tin; Total.- - -
<0.005:
'--'NIA-- . __
- 'N/A - ,
";� N/A _ -
--1--
440-31-5 Yam_.
m 1L
Titanium, -Total-
0.0256-
- -N/A� --J
NIA-----
"---N/A
-1,--
440-32=6
m /L
`
EPA Form 3510-2F (Rev. 1-92) Page UII'1 - Contmue,on,Reyerse

Arsenic;, Total -:_
OM54
N/A: -_a
- N/A— -
m - --N/A
440-38-2 `
; R? %L
li
=
',
)Cadmium, Total' °
Y-0.0013
P - NIA--- —
-- N/A Y
- N/A`----
9^
440-43-9„ 1!
m /L--
Chromium, Total `
<0.005
N/A
- N/A
- N/A
1
440-47-3 ?
na L__
- -
-
'
Copper,, Total
0.0684
N/A <
° N/A
N/A `'
-1
3
-'Mercury, Total
<0.200
N/A j
? N/A
N/A,
1
` `� '.....- -
439=9,7-G -
-
u ,L
6
',�
,
Nickel; Total_"_'_ _'
„0.00Tmg/L.
,, NW-_ _
� � —N/A" .
N%A
_ _ 1
=-
440-02-0
j
Selenium,-Tota/
0:062 irig/L
N/A-'
, - - N/A
782 -49-2
'
Silver, Total -
<0.005
`- N/A -
'-'-NIA---
-N/A `
', __-_1 - _
440-224
mall
f!
''
! -
Zinc, Totalr
0.863<mg/L
[ ` ' N/A
_'N/A--
-' N/A- '���
1 ­-
t
440-�6=�
,
r
'EPA Form 3510-2F (Rev 1-92)
Page VII-] Continue•on,Revdse

Part C'=; Lfst each potluteAt`shawn',,In Tables;2l ✓2,;2F-3 and 2F=4-that,you know cr Have reas6n'to betrevs"=is'present -See;the m"structions:for-
eaa lonal,details•and're ulreCoin fete one,table for each outfall,-
-,Maximum',Vatues
—.Aveiage tfaltieS
Number,
Pollutant
+nciude=urgrrs mr_�
irrc?uc% rims _
"Oi
And
Storm` A
-q b Semple
IW8Wn,During
-
- Grab Sample
CAS Number
Flbw,welgtit$Q
,'takeh,'Ij ring
t tow weighted
EvePits
(if avatla6le)
F Iirsti9a`
Cirt»pasite
Fir&t 3i1'
iiomp`oarte'
Salnpleif .
_
Mlaufes
_
— Nlinvtr?isk _
- -
_-
Sources`rsf Polluterits
Phenol; Total= -
'MIA'
M7A,
See Siipilariirifal'
TotolKjetdaii
2:4°r»IL .1
=NlA
- NIA,
;JV/A
1y
Fe—eal„ Ccliforrii,�
<.1,OSCFtJ1'_
A...-.
-_ r A
MIA,,-
1,00ME
-Provide
part D - data for the storm,event(s which,resulted,m the:miii imttrr►_values,for.the slow we hied
Number of hours between
it
-flow
l3ateof„ i
Duration
Total rainfall
beginning of'storm measured
Total from
Stgrm`I
of Storm Event
during storm event
and end of previous
ram event
Yen , a
(in minutes)
bn inches)'
`measurable rein eveht
( �(ga`Ilons'or speedy units)
�0=23- , ;
WO
7: F, roVide a d®scrl ion'of the method of flow,measuremer►t oraestimateT_
'F_low data de l,,ved`from a theoretidill.f b* calculatlon,using,local'mefeorological data and,runoff area' of the
qutfalJ:
3
t
EPA Form 3540-2F (Rev 1-k), Page VII-2

EPA ID, Number- (copy from, Item I of Form 1) Form Approved OMB No 2040-0086
SW002 NC0004961. Approval expires `531-92
EVIL Discfiar-e,lnformation y`- Continued_ from"a e 3 of F& 2F
ParVA - You must,provide the results of at,least one analysKJor every pollutant•irfthis table. Complete-one,table for each,outfall See ;
_ w matructions'for- additional details
Maximum Values b
i, Average Values ;,
i' Number
`
- Pollutant
include units _
I _ (rial�de,unrts
Of
;
And, C
Stdim
i
Grab,Sample -
Grab Sample
- ""
? CAS�Number'
'Taken During
Flow -weighted
Taken Dunng
` Flow -weighted i
Events
pf,availeble)
First;30
Composite
# First 30
`Minutes
Composde
Sampled
r
Minutes
`
i
;3,..
Sourcesiof'Pollutants
BaGrease_y
-2T6 m/L
g
-N/A
m
3g
—See pplemental -
-
Information
Biological- 1
51 mg/L
NIA -
-N/A ;
-• ., --N/A
'_ Oxygen Deir►a`nd
OODS L -
i
I
`Chemical -
-49.0 mg/L_-
"N/A
- - N/A
"'NIA
Oxygen Demand!
,
COD -- -1
-
`Total
Suspended
67.7 ing/L
N/A
I
40.4 mg/L
NIA
i 4,
;> 2
Solids SS
-Z24
�
J
-Total
mg/L
NIA
NIA
°NIA
?t '1
"
Nitroaen
�
Y.N/A,
--
�
'012 mg/L
'N/A
N/A--
'
t� 1
Phosphorus
�.
_.....
_ -.
Off
Minimum -
Maximum-
5.4 SU
5.4 SU
`PartB = List each; pollutant,thatiis-limited-In an effluent guideline which -the facility is subject to or any pollutant,hsted•imthe`fkbil?ty's,NPDES- ;
permit for its process,wastewater(if the facd?t'y is,operatmg!under,an existing NPDES permit)" _Complete_ one table for;each outfall I
_ --Seethe m_`stnictions for additional details and're uirements.
Maximum
Values
Average Values ;
Number
—
Pollutant
ineludevnits
rrtciude, unite)
Of
And, i
CAS,Number
-Girabzample
Taken'Dunng
-
Flow- weighted
`GratiSartiple��
Taken Dunng
"- -
Flow -weighted i
. Storm
Events
;
(if available) i
, First 30'
Corrijjosite
First 30
Composite, ,
Sampled
Minutes
Minutes_ _, a'
r _ k _ _
>.� -`
> _ __ .Sources of -Pollutants
Ammonia(as'N) r ;
0:90 mg/L -
--' N/A— ?
0.-5S eQF -
�" --'N/A - -
- =2' - -;
=See Supplemental
„
Information, i
C_hloiis_
5:8�ni IC"-
- -N/A
2.9 M' %L
�. N/A�
m2—
u •„_ -�__ ,
Color _- _
J180 units "
, - `-NIA'-
"--
Nitrate-Nitrite
1.0 iitg/L
NIA
0.97 mg/L -
---N/_A I
2
as N
{ n
Radioactivity;
<4.4 t 0.7 '
; NIA
N/A
N/A
_61 ha_total
_ CML-
Radioactivity,
4.8't 1. 2
NIA
_ NIA
N/A k
9
{
beta total
-
Sulfate (as S94)°'"
" 20c7mg/L
NIA {
19!0 mg/L
NIA
2
f14808-79-8
Aluminum, -Total
158-mg/L-Jr
NIA , --
`,NIA -
N/A
1
429-90s5 ,,�
--
-
--
Bakum; Total
"0:0517
_ -N/A _
.. `N/A --
-NIA -_ =('
i1
440-39-3
-06fon,-'Total
- - 0.0915 --
- NIA
-"—N/A; —
NIA
440-42-8 a
m /L
Cobalt, Total
<0:005 I
` N/A
N/A _"
- NIA-_ __-_
1_
_ 4.4-0-4,8-4 '
din lL �
_ i
Iron, Total (7439-
g. M mg/L j
NIA -
-NIA
-MA-
1
Magneslum,
3.'52.mg/L
NIA
NIA
NIA
1
Tota(,(709795-4 __
,EPA, Form 3510-'2F (Rev 1-92) Page VII-I 16ritinue on Reverse

f T$to . I -N - fi 5 - -r - < ,
Manganese
0.1,1;F-ihglL
NIA
NIA
NIA,
TOW
-Tlp,'Tdtdi--
<0.-005
NIA,
-NIA
NIA
1
440 3,1-4)_
M-gll,
T � jt#njjfjjj,-l-
Tdtd-,l'
-0.�0813
NIA,
'NIA
(7440-32-0)
'NIA
(7440-38-?)
MQ1L
-Cadnjiqjkj-'rbfil '1--,0.-0012
NIA
-'NIA
(7,"0-43i ' -
T,9/L
c4ium Tdtal ib
�5&1005
MIA
-NIA"'-
',WA'-
I
,m
(7440-4r-,$)-
CO'bp6r, Tdtal-
0,0333'
NIA-
NIA
NIA
I---,
(7440 , -aO-0)
fCa/L --l-
- --,- --
,
-
Mercury,NIA
_,Fotal
'40-20 6-91L
N/A
NIA
1
43947rq)
MOW,' Total
<0.,005
NIA
N*
iylA I
I
,(74.40--02-Q)-
Sdlenlupi,7Total
-0.05,62
NIA
NIA,
NIA
V
782-49-4�
---M91L
A
-'silvei, TOM/
i"<0.005
-NIA
NIA
A'
4,40-22-4)
'-Zind,-Total
0.486 mg1L i
NIA
iylA"
-,N1A
(744 6,6.6L
EPA Form 8510-2F (Rev 142) Page VII-1, C6ntmue on Reverse

s LIM19111UUM41Li11 WWI 1.114
Pav#C a Ust,ea- pollutant sttawit'in'Tables�2F-2,;2E-3; and 2F-4�that,you know,or`have,reason'toibelieve,is,present See the instructions fi r
atidK16U,delatls'andare- direments: Corn tete^onexiabte W'dach,ou&I, _ _ -
_a
_ ',Maximum Values,'
"4 Avera9e'Values-
� Ntimbie
-
Pollutant_
Inrude"units _ -
�`
r lrtducrejeir�fts
;tlfi,
CAS,Number
Taken During ` _
Flow_weighted,
,Gta6aSarllp�e,
Taken guring
f ---
Fidw-inieighted ;
�.Sltr�It',
Events'
'
(ifavadatile)
First 3tl - (
:Gonttiosit$
Fi st:3tt
Ccmposfta
;Sampled
Mtniites
Sources of Pollutants_,_
Phenols, TataE'
<ti:010' I
°lVlA,NtA
"
.11►!!1"_ _
_ - _ f
=:Sep suppleiieriiai
Inionrnation
-Tst1 ifjeldhl
__9:;rriglL�I
;f1►/
'fUf�A'�
lltlt►t-
Ptovide daia"for: t e'stortn'avent a ,irihrch restifted
In the'rrlaxitnum'vatues,fflr•t6e•ilow vae hted coin—osite
sam to �- -__
i
Duration
Total rainfall
Number of hours between
begmmng of storm measured
Total flova.from ;
'Storm
gygj�t
of Stomi'Event
fin minutes)
dunng,storrn event
; (m;rriches)
anddend of previous
_measurable ram,event�-,,. __
rain event
(gallons'orspe6fy units) i!
1�8. ,
} - - 180 _._ -
___ u�,_u� 1:13` T
>142
0.334.ingali
21iD8
h
�
� I
9-fit?=u
540
1.63,
> 329
0.482 mgai
1
_
!'271 :Provide a'descri on'ofthLWO—thud of flow nit asurerrient:or esWmat&
HoWdata `derived from a`theoretical flow calculation usingl'local,meteoro/odica/ dataand ?unoff,area of the `
�ouffall
al
EPA Form,3510-2F (Rev. 1-92), Page W;2

€ EPA ID Number (copy from Item 1W orm 1) r Form Approved 'OMBjNo 2040-'0086
"SW003_ NC0004961 I ApPro"val expires 531-92
VII. Discharge Information (Continued,from a e 3 of For
Part A = You must provide the results of atleast one analysis for every pollutant'in'this table_ Complete one,table for each outrall See
instructions for additional details,
- -
1VI2XImum Values'°___-
— = Average Values
Number
'Pollutant
ntc(udexunits)_=,.
_ - _,(rnpl_ude units), _
Of
`pnd ._ �
'Grab Sample—
-
`^ GrabSample
Storm
CAS Number
Taken During,
Flow -weighted
Taken`Dunng '
Flow -weighted
Events,
(W available)
First-30
..Minutes
Com , ite
First
Minutes _
Composite
€
Sampled
`
So=6c of P0116tirits
r - -
,roil 8 Grease
< 5.0 m /L
� 9 -
N/A
N/A 3
I N/A
�
I - 1M
--See-Supplemental- -
I
Information
"Biological
7Z9-mg/L
-­-54.9 mg/L
N/A -
N/A,
2
Oxygen Demand'
BOD5-
i
Chemical-
233 m91L +
' 104 M41L�
NIA
81�mg/L
3-
"
Oxygen Demand
COD
-
Total - - -
`151 mg/L`
8�,1 mg/L
i- "N/A -
`N/A
2
"Suspended
;"SolldS_(TSS
_ E
_
Total 8.9 mg/L 2.6-nig/L� N/A =2.4.4 mg/L 3
.I
Nitro en
Tota/ 1.6 mg/L 0.20 mg/L N/A 0.18 mg/L"-
-Phos - ---- -, - - -
_horus_ s - -
pH - - Minimum Mazimum Minimum _I _ -Mazimum
5.9 SU, I
Part B - List each pollutant that is limited in an effluent guideline which,the facibty,is subjec!4o-or any;pollutant_listed in the facility's NPDES -"
permd'for its process wastewater (if the facility is operating under an existing NPDES<permit) Completefone table for each ouiiiii
See the�instructions for -additional details and re uirements.
_
-
-Maximum Values
Average Values
Number '
Pollutant
include units
_-_- w- €n�f►1de units ___ -
bf
,And
CAS€Number
Grab Sample
Taken During
— =
f Flow -weighted
"Grab Sample
Taken-buring
''First-30
Flow -weighted
Storm
Events
'
�.
pf available)
First 30
. Composite i
Composite .
Sam_ pled
Minutes
Minutes
Sources of Pollutants
Ammonia (as=-N)`
0:80 mg/L I'!
0.27.'rng/L-
N/A.
0.26 rrig/L
3
See Supplemental
Information
Chloride
5.0 m /,L
'N/A,
N/A:-
ColoP
N/A. `"""1,
40X-,dnits.
N/A
N/A.
1
"
Nitrate_ =Nitrite
;' 1:2 mg/L "i
' 1:3-mg/I
N/AE
I.04'mg/L
3
-
-�
_N/A'
Sulfate (as SO4)
N/A - ��
-10:3ing/L
- `W aN/A
--
1
"
14808_=79-8
A/urriinum, Total
-0.753`mg/C,
; 0.897 mg/V-
" - -N/A ­
-0.632 mg/L-'
- 3
429-90=5 ,
-
'Barium; Total'
'0.415,mg/L i
' OA226
- NIA - -
0:0224 +
"...3'-
- - "
440-39c3 ,
m a/L
- -
m /L
Bdfdh, Total
0.07Zmg/L
<0.050
N/A
"<0.050---' ,
3 -
440-42-8
m 7L
mg/L,. I
Cobalt; Total"
<0.005
; <0.005
N/A'
<0.005
3
4;40-48=4)_, _'
_,t)n 1_L
�212
_m /L--_. --
m %L _
_ __
'iron, Total�`(7439-1;
mg&
d 0..999 mg/L
N/A'
0.,723-hWI_
3
�'
Magnesium,
"R.57 mg/L
1.21 mg/L
N/A
1.07 mg/L
3
"
Total- 439-95-4
_
Manganese; - '
1.38-mg/L
_ 0.0,792 - ;
N/A`-
0.0605
j -3
Total
mg/L
mg1L
EPA Form 3510-2F (Rev. 1-92) Page VII-I Continue on,Reverse

no' -Total -_ - -__
� -' <0.005
<0.005 -
,;
N/A i '`
<0:005
440-31-5
m /L
�-�--m1 /L'....,_._
_ - �;
1 ,m -/L
- --
-
Titanium; TotaY
- 0.0299 `--{
0.0403
N/A
0:0268
-
44042-6
MgIL
_ -._.m %L—,T
i
n►
- _ _
-"
,,Arsenic, Total-
`0:005mg/C 1
ea.005!
,N/A
I <0:`005
-3'
Cadmium, Total-
- <O:OOf ��
- �- <0:001
N/A
► <0.001
3
440434-- _
m_ /L i
m /L
�: _'
_-_- ma%L...�...
, ___ z - -
-- - -
Ctiromfum; Total
<0.005" "
'" <0.005`�
c " -"N/A
- -<0:0,05 _
3
f
F .440 y47,-3 _
Mci
sn /L
m /L
Copper, Total,
0,0533 A
0.0182- - -
- " N/A
0:0168
- 3
-"
440-50-8 _
_ t�i /� _ _
m 1L
M6rcury; Total
<0.200
<0.200 ug/L ',
NIA-
<0:200 ug/L
---
-
'Nickel;
0.0068
<0.005
N/A
- <0.005
- - 3'
"
440-02-0
m L, _-_ :
_ _ _ ma/L
=- - _
µ- mall-
-
.
otal
<0:010
- <0.010
N/A
<0.010 -
- -3,"-''-
" --
ma/Lm
L
<0.005``,j'-<0:005-"
N/A=<0.005
3
L,74,4-2Z
m /L �3
, m /L . ,
T
2.29 `mg/C :;
0.758 mg/L F
- ' ` N/A
' 0.753 mg/L
3 G
EPA Form3510-2F (Rev. 1-92) Page VII-I
Continue on Reverse

Rwd4lwisflAtfrnm fho Frnnf
Part'C _- List -each pollutant shoWn inTabl6s 2F-2,x2F 3,72nd 2F4 that you know'or have reason to*believe is present :See ttie instriaictioris for-
- adbitional dethils-and _ ciirernents"'Corn' lete-tiite tablefor each1'outfifl
J
Meximurts Va ues-
-Average Values
'Number"'
Pollutant
induCle}uiir"ts
irtc1ade un6f `_
Of'
And
CAS Number
;StOtTY1s
Events
GratitSamiile
7akeibuM4 '
^—
,Fl6wwwe1ghted,`
yGrab�Sarnple
Takiriburing
_ m_ _
j f=Jovo=weight`ed`
(iPava4ible)6si"30
i
Composite:
Fib 3tl.
°Cobsite
. Sal pled'
_d(linuies' I
51NiriuGes
_
Sources of,,Pollu6nts_
_
rPhJ l?OtS,n7'rital
:"Q:ft45`mg/t;
+`A// 1�
i1t/A_'
;lit/,�
--?
She StOO/eiWonta_l,
�N/A`; -
N
Total`°lti+�/ all! °
-7,7,nig1�
'S'tnor/t
j
44°rngr/t
;-
J�htr�r�
W,. :=�
Feca/,Go//fctri
�QO�
F=;It►!a';
4= zz
��,+/ ..t_..
_�1 r
{fx
CFU/10Q
-
""
k
��site
n PartD - Provide,data
for the storm
e9dntM whiata.tesulted in the maximum values-for'the flow
Wdi ht , -sample,
,Dete,ofr
Duration
i Total rainfall
i ;
Number of hours,between
beginning of stor'ni'measured
i Total flow from
istorrft'
Evsf#tp '
of,Storm Event
(rmmmutes)
a dunngistonnievent
(in inches)
and end,of, previous,
—measurable.ralwevent� —
k raiinevent
--(geUons'orspecify units)
-6-22-
360; -
----
- ° - 1.74 -
al-_`
0582m g
r;2ptt8 i
0.53
; >113,
0., f77`mgal
�748-
.380;
r 1.13
>'142
0.378.mgal
tz0oa
-
-- - - - �
17. P_rbvide,�
db;iNi- tion�of the method
Flow data derived,fro►n'a�theoretica/ flow calculation using local meteoio/ogical data and runoff area of the -
EPA Form,3510-2F (Rev 1-92) Page 1-1

NFRE S Supplemental Information for
R 0,
iyerbend Steam. Station
NPDES Permit No. NC0'004961
August 2009

Riverbend Steam Station, Gaston County`
NPDES -Permit*, NC000496,1
Page 2 pf,`20
General, )information
Riyerbend Steam�,$tatiow(RB)dsia coal-fired electric generating -plant owned�and operated by
Duke Energy -Corporation. RB is located at 1.75 Steam Plant Road, six miles northeast of Mounf
Holly, North Carolina.
RB's first three generating units were retired in the late 1.970s'..Units 4 and ,5 are each capable of
generating 94,060 kilowatts of -electricity. Units, 6 =d 7 are rated,at 133,000 `kilowatts each.
In addition f6lhe-coal-fired units, four- combustion turbines supply, 30,000 kilowatts each,.for use
during periods of peak demand for electricity. Combustion turbines ,operate differently from
steam plants. They burn oil or natural,�gas to heat compressed air, which expands and drives a
turbine -generator to,pfoduce electricity.
RB utilizes water pumped-fr'om the Catawba River (Mountain Island' -Lake). `The outfalls'at.RB
discharge.the water back=into the Catawba River: A schematic flow diagram of water use,
treatment and disc}5arge,is,on Page 22 of 22 of this,document. rA narrativesdescription, of the
individual waste streams follows:
Outfall"001 - Cond'enser Cooling -Water (CC
The,CCW system is a once through non -contact cooling water°system which removes heat from
the condensers and 'other selected heat -exchangers Raw water from the ,Catawba River,is passed,
tlffough�condensers arid''auxiliary-equipment on a "once -through" basis'to cool equipment and
condense exhaust steam from the turbines.
Wher 'RB is operating at -full powerjt•is has a design capacity to pump 622.1 Million Gallons
,per Day (MGD) of cooling water through a network of tubes that runs through, the condenser and
selected heat exchangers (e.g. turbine'lube bil cooler, condensate cooler, plant chiller system).
This raw water in the condenser tubes absorbs.,,heat from a closed system of highly purified
_exliaiistvsteam• from the turbines and converts it back to water. Condensed, exhaust steam,is then
returned to the boilers and is recycled a'-num of of times: The cooling water is returned to the
lake. No chemicals are added and only heat, rejected from the condensers and auxiliary
equipment -is absorbed by the cooling water; hence the term "once through, non-contact.cooling
water" is applied.
The condenser& tubes are periodically cleaned mechanically. Metal or plastic scrapers are forced,
,through the tubes,to rid them of'scale or other deposits.
,Each unit at'RB has two CCW pumps. The pump capacities are listed below. Normal plant
operation of lhe. CCW pumps is based on intake and discharge�temperatures and unit load.
Further,;the units -are operated•on different computer highways.or WDPF control systems to
avoid a system trip that°would suddenly reduce production bf,eleciri&y: This practice leads to a
higher reliability, factor f6fthe units,arid protection of aquatic life taking refuge in the. discharge
,canalAuringYdold weather. Multiple- control units, assure that the entire discharge flow, at
061 and the heated effluent will not suddenly, stop.

Riverbend,Steam Station, Gaston -County
NPDES Permit # NC0004961
Page 3 ofi20
Filier Backwash -from, Raw -Water, Intake, Screening,Device
Raw watei4ritake screens are backwashed,oman as needed basis. Normally, the'screens require
backwashing once per twelve, hour shift for period of approximately 20 minutes,, The -water
:required for.,backwashing is supplied'by, a,low pressure service�,pump,with,,a design capacity of
800 gpm. Therefore, the'average flow of water used to backwash the;screens is_0.032=MGD.
Should it become=necessary to backwash the screens on, a continuous, basis the�maximum,flow
would be 1.15 MOD. This intake screen backwash is discharged-into.the condenser cooling
water line downstream of the condensers. The debris collected on the,screens consists mainly of
twigs, leave"s,.And other'material 'indigenous to the Catawba River.
Intake Tunnel Unwatering Sump
Iri the,eventthat maintenance a ctivities,are'needed in.the-intake,tunnels an unwateringzsump is
provided'to remove,water-from the-tunnel(s). To date this operafion,has not been performed, but
it is available, should the need, arise. Raw,water in:the1drinels can be removed by_•,a sump pump
to the discharge side of the condensers which would then exit at outfall 001.
Turbine Non -Destructive Testing
Bore sonic testing -of turbine rotors is infrequent, ,approximately once every 5-years. A,maximum
6f400 gallons, of deminer"alized-water mixed`with 4 gallons of,a corrosion inhibitor-, e.g:,Calgon
CS, is used during the testing per -unit. 'The mixture,is drained and mixed with once°through
cooling water downstream of the condensers which discharges at outfall. 001. `
Sawdust Addition to the -Condenser
When the.condenser tubes are suspected to be leaking, Riverbend Steam'Station adds as -,needed
proximately 50 pounds of sawdust,in the plant -intake area, in order to temporarily stop the
leaks. Once the unit comes :off line; the leaks arethen permanently repaired.
Outfall 002 - Ash Basin
The, ash basin -at RB, accommodates, flows from the yard drainage sump, boiler: room sump, ash
removal system and- non-point-source°storm water. Total average influent from these sources
comtiined,is approximately 5-MGD. AVtimes, due to unit.loads, rainfall,.evaporation and
seepage of ash basin ponds,,the amount of effluent may be,quite different thari'influent volumes:

Riverbend Steam.Station, Gaston County
140 ES; Permit'# NC0004961
,Page 4-of 20
pH,,
djustment,
During warm periods of the year, algae blooms'occur-in the asl °basin causing pH levels.to'ri'se
A,CO2 sy,stemis.utilized during these -events to maintain the pH,level between 9.0 and 6.0
standard -units. An n acid injection system'utilizing, sulfuric acid -,and also a sodium hydroxide
injection system may -also, beQutilized for additional pH adjustment.
Yard Drainage Sump
Th&yard drainage sump is a large concrete structure that'has four level controlled pumps that
direct wastewater from RB to the ash basin. These pumps.are operated on�a rotating basis:
Usually two -pumps are, arranged, so that one pump is used in a primary capacity and the other is
backup, After a preseledted period the,coritrol's are:changed so that different pumps are utilized.
The yard drainage sump collects wastewater, from many sources, such as, sanitary system,
groundwater remediation system, and turbine room sumps. Th sNsump`alto collects once,through
non -contact cooling water from. the induced draft (ID) fan -motors and,the•preheater bearings
located in the emission stacks,. The,yard drainage'sump also coll'ects4torm water runoff from the
coal pile, rail access, powerhouse roof and paving. Groundwater from a -foundation drainage
system undeuthe track hoppefis also'intermittently discharged to,theyard drainage sump. = The
combined average flow from all sources tied to the yard drain sump is approximately, 1.4 MGD.
Sanitary System
Plant sanitary wastes,are treated by a series of three 4,0Kgall'on septic tanks in parallel anda
1';200 gallon'holding tank Sanitary effluent is pumped from the dischafge chamber of the septic
tanks to the ash basin via the:yard drainage sump for final, treatment. The sanitary waste system
is -designed ,for-12;500 gallons per day. This design was fused on a maximum;and average of
300'and 150 people, respectiv-,ely. Based on annual data tlie,average,daily flow'to,the yard drain -
sump has been approximately 0.006MGD.
The sanitary,systemaaccommodates wastewater flow from.the following -'sources:
® general plant,,sanita y, wastewater
• chemical makeup tanks and drum rinseate (Intermittent rinse water containing small
amounts of aluminum sulfate; sodium hydroxide, hydrazine, ammonium�hydroxide)
a laboratory drains (Small amounts of laboratory chemicals used -to 'test wastewater
diluents, and high put'ity, boiler water)
a office trailer sanitary wastewater.
Ground Water Remediation.System
This system was ,installed in I M. Groundwater is pumped through an oil water separator and
then°to the turbine room,sump. TTa=ainounts of volatile,otg"anic"compounds may be in this
wastewater, such as naphthalene, chrysene, methyl tert-butyl ether,,and bis (2=ethylhexyl)
phthalate: `The average daily flow from this system is-2,gpm approximately 0.003 MGD. A
revised groundwater corrective -action plan has been, submitted' to NC DENR that specifies a
treatment capacity capableof 20, gpm or?0.03 MGD:
Vehicle -Rinse -down System
Effluent -from, a vehiclexinse-down area is directed to the,ash basin. The rinse,water contains no
soaps or other additives.

Riverbend Steam Station, Gaston;Gounty
NPDES Permit # NC000496,1
Page 5 of 20
T,yrbine,Room Sumps
Theturbine room sumps collect approximately 1'MGD of4astew4ter via,a network of floor
,drains from intermitterii sources'listed below:
• ,Condensate from the.feed water system (seal water, valve and pump leakage, cooling
water, vents),
® Equipment cooling water, i.e. air, compressors;
• Floor wash water containing janitorial products;
• Boilerroom;sump overflow, and
• Emergency fire fighting water Chillericondensates:
ID Fan and Preheater Bearing Cooling Water
Once through,non-contac't•cooling water is supplied°to the ID Fan�motor and pfeheater°bearings
to remove excess heat. The rate of flow through thek'two pieces.of equipment which discharges'
to the yaid�drainageYsump`is,approximately•0.03"MGD.
Railroad,Track Hopper Sump
This sump collect's groundwater from a foundation.drain system underneath the -track hopper.
The3flow is usually intermittent,,and the pump capacity is 100 gpm MGD. On,a!daily basis ifis°
estimated that the.run time is 50% o which would,correspond to a flow of 0:05 MGD.
Boiler. Room -Sumps.
The average flow pumped` from the boiler room sumps directly to the, ash basin is approximately
1.3 MGD. The -sources of input to the boiler room.sumps, include the following:
Filtered Water System to tbe•Old End Pit Sump
The, filtered water treatment system at-RB,consists of a clarifier, five gravity filters, two
activated carbon filters,.Reverse.Osmosis .(R6) system and one'set of demineralizers.
Wastewater and filter media from the filtered water system (except RO and'clemineralizer
wastewater which goes to the,boilet room sump) is drained'to what RB commonly refers
to as the`"Old End Pit Sump". 'From the',pit sump the wastewater is pumped to .the'Boiler
Room Sump.
Clarifier
The clarifier,utilizes-typical�water treatment chemicals such as; aluminum sulfate, sodium
hydroxide,{ and,calcium hypochlorite -for the primary .treatment -of raw water. 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 (alum)�and sodium hydroxide. The quantity ofulum used per, year is
approximately 1320 gal/yr. The average volume of water required.for,desludging the
clarifier is -approximately 0.002-MGD. These sedimentation wastes, along with dilute
-water treatment chemicals, and, by, -products are ypiped to a,floor+drain which,-flows-to,the ,
old -end pit,sump where they are drainedwthe,4 and 5 boiler room sump and ultimately,
to the, ash basin.,
Gravity7ilters
There are five gravity filters composed�of anthracite (coal) which follow the clarifier -in
the water treatment process. Normally, one of these3f lters-is backwashed,each,day.
Approximately 0.002 MGD of backwash water is required for each filter. This

Riverbe_n_d Steam, Station, Gaston.County
NPDES Permit#.N00004961
Page 6 of.,20
wastewater -flows through floor drains to the old end pit -sump which pumps to the, yard
drain sump,. The, anthracite, filter is changed on -an as needed basis :with the spent filter
media being sluiced to the ash basin,via the boiler room sump:
Activated 'Carbon Filters -
The filtered water system includes -one activated carbon filter. This filter is typically
Wckwashed once ameek. The,flow of water required',to backwash fi'lters,is 30 minutes at
100-120,gpm., The backwash flows to the,#9,and #10 boiler"room sump -and' is pumped to
the yard drain, sump.' Approximately 60 ft3 of -activated carbon is-replaced,yearly with the
,spent;carbon sluiced to the ash basin via the boiler room -sump.
Reverse. Osmosis, (RO) Pref lters
There is.one RO prefilter vessel containing twenty-one 1 micron cartridge filters,which
are used to filter,suspended solids. Cartridges are changed out every I=2 months.
Reverse Osmosis Unit
A RO unit,isused to;purify the make-up water, thereby increasing the efficiency of the
demineralizerszand reducing-the.amqunt of annual chemicals needed for demineralizer_
regeneration. During operation, the unit has a continual blowdown of-50 gpm, which is
discharged to boiler room sump and then to the -ash,basin'. 'Me RO unit.is cleaned,on a
quarterly, basis with°the wastewater going to the# 9 and #10 boiler°room sump and then
to, the ash basin. During cleaning, approximately 30,lbs of the. cleaner OSMO AD-20,
containing sulfamic, acid, citric acid and sodium lauryl,sulfate,'is­used. Also used•is a
generic -cleaner consisting, of,,tri-sodium laurylsulfate, sulfuric, acid acid,,a biodide with
approximately 400 gallons of wastewater which is, sluiced to the ash "basin.
Demineralizer regeneration wastewater
The, demineralizers consist of 2-mixed-bed cells -which supply make-up water.to the
boilers and other dosed systems. Normal plant operation requires that -only one.
demineralizer cell operates at a time. Each cell has a capacity of 140-gpm. Each cell is
regenerated approximately 12. times per year. Each year RB will use- an estimated 800
gallons of 509/o caustic and 400 gallons of 93% sulfuric, acid for demineralizer
regenerations. Awaverage, diluted waste chemical and rinse flow•is approximately 0.004
MGD. The diluted:acid and caustic are discharged from the•cell simultaneously through,
the same -pipe header -for neutralization purposes. The regeneration wastes flow to the #9
and #10`boiler roorri sump, to the yard drain sump and then is pumped to the ash basin.
The spent resin is sluiced to the; ash.basin.
Closed ,system, drainage, cleanings, testing, containing:
Closed systems€containing corrosion inhibitors, a.,g,.'Calgon CS and,MCS=plus2, Biodides,
e.g.,Calgon H-300 and H=510;,Bulab 6002, Cleanings, e.g.,small heat exchangers;
Dispersant, e-.g. polyacrylamide; Wetting,agent, e.g'.sodium.14ulyl sulfate, Detergent, e.g.
tri-sodium phosphate, Leak testing, e.g. disodium fluorescing dye are;utilized. These
chemicals are,periodically routed to the station sumps and ultimately -to the ash basin.
Miscellaneous �systei i leakages:
Small leaks from pump packings-andseals, valve seals, pipe connections periodically
occur and,are sent to the ash basin via plant sumps.

Riverbend Steam Station, Gaston County'
NPDES Perrht # NCOdaOl
Page-7 of 20
Boiler blowdown
During unit startup and until water chemistry stabilizes, the blowdown, from the boilers -is
allowed to flash into a blowdown tank: After water chemistry has stabilized the amount
blowdown condensate flow-'is,miniscule. The condensate is drairied�to'the boiler room
sumps. Trace amounts of'hydrazine, ammonia,, and silica oxideris present in the
condensate. During normal operation Boilers #7 and #8`blowdowmaf an average rate of
1'0001bs. of'steam per hour. Boilers #9 and.#10 bl'owdown,at-an-average_rate of 1000'lbs.,
of steam}per hour. The combined- condensate flow from these blowdown., averages
appfoxirnately 0.005 MGD. This, -flow is routed to` ash basin via the boiler room sump. A
sighificanfportion of this blowdown, steam is vented to the atmosphere.
Chemical Cleaning of Boilers
Boilers}#7, #8, #,9 and #10_ at RB arechemically cleaned on an,asmeeded'basis (Boilers
#1-96,are retired)'. Boiler -tube inspections are.performed-during outages td,det6fthihe if
cleaningsneed to`be.schedul'ed. Boilers #7 and #8,are natural circulation boilers and #9
and #tare,controlled?circulation boilers:
The -volume of the. boilers determines the quantity of chemicals required for cleaning..,
Boilers_#7 arid'#8-each have,a water -side volume of 26,300.gallons The volume of #9
and # 10 boilers is -24`,'900 gallons each. The total volume of dilute=waste chemicals,
including -rinses, discharged from.#7 or #8 boilers during a;chemical cleariirig is 365,000
gallons. The total volumetof diluted waste chemicals drained from #9 or #10-is,
approximately 27,5,0.00 gallons. ;Thesewastewaters aredrained,to the boiler room sump
which,pumps,directly to the�,ash basin. Immediately prior,to,_the beginning,of wboiler
cleaning, additional stop logs=are-added to the ash basin discharge -structure. This,action
ensures longer retention time' of -the chemical wastes<in the ash basin -for proper treatment
through dilution, neutralization, precipitation, and' ion -exchange as documented in the
Ash, Basin Equivalency Demonstration (October 1976). Chemicals`and approximate
amounts required to clean the boilers�are listed below:
19iStage (Copper Removal Solution)
Sodium Bromate
Ammonium Carbonate
*Ammonium Hydroxide
(26°Be')
29d Stage (Iron Removal Solution)
(Includes.rinses and neutralization)
*Hydrochloric Acid (31.5%) (20°Be')
*Ammonium Bifluoride,(O.So/o)
Copper,Complexer (0.75%)
Thiourea,or,equivalent
Sodium Carbonate
Citric Acid
Boiler #7`orW8'
'556 `lb
10001b
85,0:gal
Boiler, #9.or,#10
5501b
10001b
850 gal
Boiler#7.or #8' Boiler Wor:#10
13600 gal
3406_igal
11001b
1050lb
11660Ib
1630lb,
30001b 32001b
300 lb -200 It

e , r r;,
Alkaline Boilouts
(only after major boiler tube -work)
Soda Ash
Triton X-100 Detergent (0.5%)
.Antifoam Agent (0.025%)
Riverbend Steam Stailon„Gaston County.
KPDES Permit;# NC0004961
Pageof 8.20
Boiler #7 or #8
20001b°
10 gal'
5 gal
Boiler #9 or #10
2000 lb
,10,ga1'
5 gal
*These chemicals are present in amounts greater�than the:reportable,quantiiy as identified under
the Comprehensive Environmental' Response, Compensation, and Liability Act (CERCLA). If a
spill of these, chemicals did occur, it would inmost cases be sent -to the ash basin where
treatment'would occur. -
Ash Removaf System
RB utilizes electrostatic precipitators as its air pollution, control devices. The -fly ash,captured in
these precipitators is water-sluiced.to the -,ash basin. Bottom,ash from the boilers is also water-
sluiced'to the ash basin. Approximately 3 MGD of water is.,required forthi_s'puipose.
Electrostatic precipitators`Tat RB' are -normally cleaned by mechanically vibrating fhe wires and
rapping theplates inside,the precipitator. Before major precipitator -work is performed the
precipitators are washed 'down with water. The water is pumped to'the ash basin.
Miscellaneous;
The -ash basin receives the following, miscellaneous wastestreams; Laboratory wastes,
photographic wastewater, de-icing°products and expired reagents.that will be co -managed other
Wastewater, for compliance with,NPDES permii1imits.
Outfa11:002A — Yard Drainage Sump Overflow
An�overflow pipethat directs flow,,from the,sump'to-khe ground'was included -in -the construction
of the'yard,sump. This modification was performed to prevent submergence -and damage of -the
pump,motors within- the -sumps in the event that•alf pumps, failed or redundantpower supply lines
couldnot be,restored in atimely manner: Given significant overflows, the wastewater could
potentially -flow'into .the Catawba River. This `type of incident will rarely -occur.
Spill Prevention
Oil Storage
RB presently has four above ground oil storage tanks - one 4,250,000 gallon fuel oil tank, one
27,000 gallon fight -off fueh oil tank, one•20,000 gallon -mineral -oil storage tank; and one 2,000,
gallon used oil storage tank.
All'above° ground tanks have secondary containment provided which'are capable=of containing
the, entire contents of the tank. An oil trap tank is located in,the.drairiage,area of the 4.25 million,
gallon,oil .tank as an added precaution.
All oil storage+fadilities are presently covered under Spill Prevention Control and
CountermeasurePlans (SPCC), as well as a site Facility Response.Plan (FRP).

Riverbend,Steam,Station, Gaston County
NPDES_ Permit# N00004961•
Page�9 of 20
,STORM WATER
RB has several storm water,outfalls that discharge to the,Catawba River. RB,,was included_ h the
}group application submitted to -the Environmental Protection Agency in March, of 1991. Storm
water outfalls SW001, SW062,an,SW003 have been evaluated and`afe,fep'rekfitative,of the
other -storm water outfalls at RB.
Site Description
The RB - site. covers 572 -acres2 and, includes a plant yard of approximately 20 acres and three
switchyards,•which cover about eight acres. The, coal storageyard encompasses 13 ,acres. The
-site also includes a one acre -scrap yard and several construction spoil areas. Across, the site, there
are.rapproximately two miles of rail access and onef mile of paved ,roadway,§. The primary -and
secondary. ash settling basins havesurface areas of -approximately 41 and 28•acres, respectively.
Prior to -construction, of the ash settling basins; waste' ash was, disposed' in the -cinder pit, which
covers approximately ,9 acres Between the coal yard and ash basins.,
Soils,at RB, are,typical,of the region,and are predominantly micaceous sandy silts with some clay.
The topography i"s••generally flat with some lolling hills in outlying, undeveloped areas.
There, are 14storm water, discharges and three NPDES permitted discharges at RB:. ,Samples°were =
collected from oatfall& SW00, SW002 and-SW003.-
Facility brainage-and Inventory;of'Significant Materials and Controls
Stormwater
Inathd station area,. stormwatef runoff flows overland to concrete ditches;and catch basins, which
are connected to_a buried network of corrugated metal pipes (GIMP). Thenetwork was originally
,designed to route flow to several primary,trunk lines, -which flows into Mountain'Island Lake.,
Stormwater runoff from most areas' subject to, "significant materials and activities has, been
rerouted through=either the yard sump or oil/water separator tanks Effluent,from the yard sump
is pumped to the ash,settling basin, Stdrmwater processed through oil/water separators is,
discharged to Mountain Island Lake. Station personnel -routinely .inspect the plant- yard and
switchyard's -for potentiate spill sources. The intake and discharge canals, yard.sump, and ash
basin are inspected daily for evidence of oil leakage.
Based on pipe networks and 2site topography, the ,Riverbend site was divided into `individual
drainage basins as shown in the attached site drawings. This- section '"ddWls-thirteen of fourteen
storm water- outfalls (Outfall 9, has been abandoned): Also identified, are three regions. of`
nonpoint source \ stormwater runoff that flow overland to Mountain Island Lake. Additional
outfalls may have been excluded because either they ^have been abandoned, or bec&sef they are
not located' within the vicinity ofthe -station or any industrial activity. To, provide a complete
description:of th&storm waterdrainage system,,the yard sump.system is -also -characterized.
A description of the drainage,' area,, significant materialsi and material control measures .are
presented for each drainage basin. I_n addition to the, significant materials particular to each
drainage basin, herbicides ;are applied to selected -areas throughout Riverbend Steam Station to
eliminate undesirable vegetation along railWays, ash pipelines; yard sump pipelines, and the

Riverbend Steam Station„Gaston County
NPDES Permit#,NCOo04961
Page 90 of 20
perimeter fence. Herbicides ,are also applied in ,switchyards y_gravel lots; and rip -rap areas. All
herbicides- usedd-at Riverbend Steam Station are, -approved by the company and considered safe to
the,:environment,when used according to directions. Records are retained at'the site to document
information such as: the areas treated, the herbicide used` and�the•amounts ,of herbicide used
• Outfall1
Discharge Structure: 24 inch (") diameter () CMP
Location: Western ,bank ofthe- intake canal
Control Structure: 10,000 gallon oil separator tank'#3
Drainage, Area: 4.1 acres
,Area Description
'This drainage basin includes a 2.7 acre portion, of the main switchyard and 8,,700 ft2 of 'the plant
yard between the ,powerhouse and Combustion Turbine, (CT) area. The powerhouse covers about
1 5"acres,of this -drainage basfn. 100 pdreent,of the.drainage area is paved or roofed.,
'Significant Materials /_Controls
Oil Oil -cooled 'transformers and circuit breakers in the main switchyard contain a total of
approximately 120,000 gallons of oil. About two-thirds of the main switchyard falls within, this,
drainage' area. Some-swit'chgear equipment have containment pits beneath them. This substation
is inspected twice daily for fluid loss fromrswitchgear equipment. All runoff from this drainage
basin is processed through the 10,000=gallon oil separator tank #3.
4e 6utfa112;
Discharge•Structure: 21" CMP
Location: Western.bank of the mtake:canal
Control Structure: 10,000' gallon oil separator'tank,#2.
Drainage Area: 13.6 acres
Area Description
This drainage, area includes, the 44 W ,switchyard, a portion of the main switchyard, and the
circuit breakers for the 230 kV switchyard; these segments- cover 0.4, 1.7, and 0.5 acres,
respectively. Two' control buildings for the CTs, are ,located within this -basin: There is half -an
acre of yard' -and parking area between the CT control toomssand the main switchyard. To the
,south of the main switchyard, there are approximately six acres of lawn area. The railroad
embankment along the eastern basin boundary 'is sloped at a ratio. of 16 horizontal to 1 vertical'
(1.5H:. IV). The embankment and railways cover appr"bxiinately, 23 acres, To the east of the -
railways is,the fuel unloading -area which covers about 0.9 acres. About one mile ofrailways and
ofid-third mile of paved roadways, pass through the area Approximately 35 percent of this
drainage, basin is paved: All runoff from this drainage basin is processed through the 10,000
gallon, oil separator tank #2. 'There pis a vehicle rinse area within this basin, but the -effluent is not
discharged through this outfall because it,is routed,to the ash basin through the septic system.
Significant Materials•/,Controls.
Oil: The main switchyard, 44 kV ,switchyard, and 23,0, kV -switchyard each contain a, total
volume of 129,000, 10,000, and 6,700 gallons of mineral, oil per switchyard, respectively. The,
main switchyard and'the 230 kV switchyard ate only partially located within this basin. Some
switchgear equipment have,containment pits beneath them. The main,switchyard and the 44 k_V'
switchyard are inspected twice,daily for fluid loss from switchgear-equipment.

Rive_rbend Steam Station, Gaston County
NPDES Permit # NC0004961'
Page 11 of'20
There are two"18,000 gallon storage tanks in the main switchyard. These-tankss have''been closed
out and labeled "out of'service" Ranformers 'in the CT'area contain 9,559 gal'lons'of mineral
oil. Each CT unit -contains about 400 gallons of oil.
If maintenance were necessary for the CTs, lub'e oil would, be transferred from the units via a
tankei truck to a holding tank located in drainage basin46.
The'fuel oil unloading,area,is located along the eastern basin boundary,, beside the railways, Two -
of the ten bays ,are.,operable. In .the fuel oil unloading ,area, diesel fuel is .transferred from an
8;000 gallon tanker truck to an underground pipeline -which flows to the-4,250,000 gallon fuel oil
bulk storage tank located south of the CTs. The pipeline is equipped with a back flow preventer.
DO I _9ading procedures are followed., Drainage Nom the fuel- oil unloading,area;is processed
through -a 30,000 gallon oil separator tank located -'at the base -of the railroad embankment, on the
south,side of the plant access road. Storm water exits the oil/wate_vseparator,tank by -way of a 12
inch diameter -concrete pipe which discharge`s irito.a c6narete ditch. The, ditch'leads to ,a,.CMP
network that leads to the 10,000 galloon oil' separator tank #2.
Outfall 3
Discharge Structure: 36 CMP
Location-'. Western bank of the intake canal
Drainage Area: 15.44 acres
Area Desdription
This drainage_ area.,includes approximately one-half acre of the containment dike slopes at the
fuel oil .bulk storage tank. Approximately ten acres of lawn area border °the plant access road.,
Drainage from the three acre, 230-kV switchyard=is discharged into azoncrete ditch which leads
to this outfall. About 900 feet of paved access road and 800 feet of ,ra_ ilways border th_ is -area:
Approximately 5 percent.of,this drainage basin is paved.
SiVnificant Materials / Controls
Oil: The fuel' oil -bulk storage tank is an aboyeground,,galvanized steel cylinder.surrounded by
an earthen berm- sufficient in height to contain .a total spill of 4,250,000 gallons plus rainfall.
Normally, the tank holds between .800,000 and 1,200,000 gallons of oil. Rainfall collected
within, the_ containment berm is inspected ,for the presence of oil before "being drained through a
manually operated siphon to` Outfall 6.
Adjacent to the fuel oil bulk storage tank,,about three feet of piping which conveys -diesel fuel
from the fuel oil unloading, area to the tank -passes -above grade over,a concrete, drainage -ditch.
Swi'tchgear equipment in'the'230 kV yard contains approximately 6,700-gallons of oil. A 400
gallon oil rupture collection tank collects drainage from the two station service transformers
Which contain a- total of 226 gallons of mineral oil. Runoff 'from the 230 kV switchyard ,is
discharged into a concrete ditch running along the north siderof the yard. The ditch passes under
the.plant access road through a 36 inch diameter CMP. The west end of the CMP has a.,swing
gate, which would be closed to help contain oil,spillage from,the switchyard.
• ®ut'fall.4
Discharge,Structure: 15" RCP
Location: East-of'county road #1912
Drainage -Area: 4.9 acres

Riverbend Steam Station,,GastomCounty
NPDES Permit #'NC,0004961
Page 12 of,20
Area Description
This drainage basin is bound: on the, west by the access road for the fuel oil unloading area and on
-the east by county road4l 912. Approximately 4 5 ,percent of the drainage basin is paved; the rest
is,grass.
Significant Materials / Controls
Oil: A transformer for the fuel oil pumps is located within this basin, and it contains 482
gallons of mineral oil. A berm is installed around the transformer to contain any spills that could
occur.
The access road to the fuel oil unloading area forms the western boundary of this -basin. The
tanker trucks which transport fuel oil Have a capacity of;8,000,g4llons. _
o Ouffa115
Discharge- Structure: 24" CMP
Location: South of the 230 kV switchyard:
'Drainage Area: 15 acres
Area,Description
This ou_ ffall conveys runoff ,off -site, beneath the .plant ,access. road to a, drainage ditch along
county road #19,12. Approximately, eight percent of this drainage, area,is paved, and the. rest is
'grass.
Sig_nificant.Materials,/ Controls
Thereare no significant materials stored,within thi's:area.
Outfall,4
Discharge Stricture: 36" CMP
Location: Western bank of the intake canal
Control Structure: 20,000,gallon oil separator tan_ k #,1
Drainage -Area: 5A acres
Area Description
This, drainage area 'includes approximately 1.1 acres of the CT area. 'There are about three acres
of-hMh areas, including the slopes of the containment, dike for the fuel oil bulk storage tank. The
_jet engine instrumentation house and warehouse .are located within this drainage area.
Approximately 500 feet of paved roadway passes through the;area. About 35-percent of the total
dfdiriage area is either paved or roofed. All runoff from this drainage basin is, processed through
the,20;000 gallon oil/water separator tank #1.
Significant Materials], Controls
Oil: The fuel oil bulk,storage,tank isian aboveground, galvanized steel cylinder surrounded by
an earthen berm sufficient in height -,to contain a total, spill of 4;250,000 gallons plus rainfall.
Normally,, .the tank holds, between-800,0,00 and 1,20,O,Q00 gallons -of oil. Rainfall, collected
Within the � coiitainment berm is inspected for the presence of oil before -being drained through a
manually, operated siphon to a concrete ditch at the base of •the -embankment.. The ditch leads to
the # 1 oil/water separator tank. Oil supply lines from the bulk storage tank to the CTs are
aboveground. There is a valve at` the bulk fuel oil storage tank that would be manually, closed in
the event of pipe leakage:

Riverbend Steam Station,,Gaston County
NPDES Permit #NC0004961
Page 13 of 20
Each CT unit}contains approximately 400 gallons�of oil.
Outfall` 7'
Di§charge"Structure: 24" steel pipe
Location: West of the coal pile
DraineagArea: 1.1 acres
AreaPDescription
This drainage basin contains. a lay -down yard where -various scrap materials are stored.
Approximately'250'feet.of gravel road pass through the=ea:,
Sighif canf Materials-/ Controls
There are•no significant materials stored -within thi's area.
• Outfall8
Discharge -Structure: 36" CMP
Location: East of 'the yard sump, into.Mountain Island,Lake
Drainage Area: �:-65 acres f y'
Area,Description
Outfall r8 now encompasses the drainage -area of outfall` 9 sinceAhe influent, to this outfall was
blocked. Outfall 8 previously drained=32:7 acres and Outfall 9 previously -drained 26,acres. The
36" CMP, formerly known. as Outfall %_which is located, north of the cinder pit and,goes into
Mountain Island Lake, has been abandoned.
This drainage basin contains a 700,000 cubic, feet` ash stack and • a closed out ash stack.
Approximately 6,150 feet of railways and 2,425 feet of gravel road are contained in butfall 8.
Approximately 7 ,acres of woodlands are included within this basin. Approximately three.percent
of this, drainage basin°is paved.
This drainage basin includes the cinder -,pit, Which covers;approximately nine acres to the east' of
the coal yard. There is a one- acre scrap yard) adjacenvto the cinder pit. Prioi to construction of
the ash,settling basins, ash was disposed in the cinder pit. -
Rainfall runoff within this drainage basin flows to the cinder, pit. The cinder•pit is bermed along
its, Western and northern borders for containment purposes. The onlyfoutlet from the ci'nder-pit is
a three-foot tall CMP riser, making the,cinder-pit-a very large detention pond. Discharge from
Outfall 8'is'infrequent. Rainfall' runoffiin this drainage basin pis usually detained"in the cinder pit
and,either evapofates into the atmospher&ofinfiltrates=the giound.
Significant Materials
Oil: The transformer associated with the yard sump system contains 275 gallons of•mineral oil
Which is contained within. a berm.
Ash: Parallel to the railroads, southeast of the, cinder _pit,'ash is sluiced ;above grade in,piping .to
the ash, basil s.
Wastewater!
Parallel to the railroads; southeast of the, cinder pit;• effluent from the, boiler -room sumps is
pumped above,grade in piping to the ash basins.

Riveibend SteamrStatio_n, Gaston County
NPDES Perniit# "NC0o04 bi
Page i4 of'20
Discharge from the yard sump is pumped to the ash basin through above grade pipelines located
atop the dike which forms the northern border, of the drainage basin.
Outfall 9 (Abandoned in place)
• Outfall10
Di'scliarge Structure: 1.8" CMP
Location: North of W.F. Lark Fossil Maintenance Facility
Drainage Area: 0.8 acres
Area Description
Outfall 10 discharges in the wooded area north of the W.F. Lark Fossil Maintenance Facility;
flow is then overland to Mountain Island Lake. This drainage basin includes approximately
6;000 square feet of roofed area,and 7,000 square•feet of paved,,storage area. There is about 250,
feet, of pAyed access road. Approximately 50'percent ofthis drainage basins is paved or roofed.
Significant Materials
There are.no significant materials stored -within this drainage area.
® OutfaH 11
Discharge -,Structure: 18" ,CMP
Location: North of WY. Lark Fossil Maintenance Facility
Drainage Area: 1.2 acres
Area Description
'Outfall I discharges in-theFwooded area west of the W.F:,'Lark`Fossil'Maintenance.Facility; flow
is then overland to a creek leading to Mountain Island Lake. This drainage basin includes:
approximately 11,000 square feet of roofed area,and 33;000 square feet of -paved parking area,
There is about 250 feet of paved access road. Approximately 70 percent of this drainage basin is
paved or roofed. -
Significant -Materials
There, are no significant,materials stored within this drainage area.
Outfall 12
Discharge Structure: 8" pblyethylene pipe
Location: North of W:F,Lark Fossil Maintenance -Facility
Drainage Area- 3;000 square feet
Area Description
Outfall 12 discharges, in the wooded area north of the W.F. Lark Fossil Maintenance Facility;
flow is, then overland to Mountain Island Lake: Thus outfall conveys roof drainage from
approximately'3,000,square,feet,of roofed.area. 100 percenttof this.drainage basinis roofed.
Significant Materials
There,are no significant -materials on the.roof of Lark Fossil Maintenance Facility.

Riverbend Steam Station, Gaston County
NPDES Permit # N00004961
Page,15 of•20
e Outfall'13
Discharge Structure: 12" ICMP
•L-ocat on: Grassy area around septic -,tank/ Partof Area East of Iritake,,Canal
Drainage Area. Approximately, 400• square feet
Area Description
butfall f 3 discharges into Mouritain.Island Lake. Discharge is infrequent.
Significant Materials
There -ate no significant materials stored within this area.
A Outfall1.4
Discharge Structure; 12" CMP
Location:, Grassy area near road/ Part of Afea,East°of Intake Canal
,Drainage Area: .Appr9ximafely1400 square feet
=Area Description
Outfall '14 discharges=into Mountain,Island Lake. Discharge is infre4fierit.
_Significant Material's
There are no signif cant materials, stored within this, area.
o Area West of Intake Canal
'The rest of this area is a non -point source drainage area covering approximately- 1.5 acres,
between 'Outfalls 1 and 6. About one acre,is paved parking and yard df6a. -A trailer with foof
area fof 1,800 A,2 is in cluded'within:-thi's area: Approximately, 66 percentfrof'this, drainage area, is
,paved or,roofed. Abandoned steam -lines pass through this basin.
Significant Materials-/ Controls
There are no significant materials stored within•this area.
Area East of Intake -Canal
This is anon -point source, drainage area. The area.covers,,approximately, one acre,extending from
the, powerhouse up to the septic tarik_,sy, stem. Roof area for the light -off oil tank and several
small sheds totals about 4,000 ft2: Approximately 15 percent of this drainage basin is paved of
roofed.
'Significant Materials /,Controls
Oil: Diesel fuel i's ,piped above ground -from the fuel oil ,bulk storage'tank to the light -off oil'
tank located adjacent to the powerhouse. The piping can be manually closed at the bulk fuel.oil
storage tank; if necessary. The light off-tank,has,a capacity of 271000 gallons and,is surrounded
by a' concrete -containment pit capable of holding a total spill: The tank `is _covered to prevent
storm water collection.
• Area North of Drainage Basins 10' and 11
There are no catch basins in the northern half of the paved'parking/storage area .at W.F. Lark
Maintenance Facility, so runoff flows overland to Mountain Island Lake. This drainage area
covers approximately 1.5 acres extending from drainage ,areas 10 and 11 to the woods' north ,of

Riverbend Steam Station, GastoniCounty
NPD_ ES Permit # Nc0oo4961
Page 16 of,20
V.F. Lark Maintenance -,Facility. About 15,000 ft2 are -roofed. Approximately 75 ,percent,of this
drainage basin is paved or,roofed.
'Significant Materials / Controls
Various»liquids such as coolants; oil,, and,cl'eaners ar`e stored outside in'S5 gallon drums. Usually,
a -total of about_ O,drums are�stored undercover, in;a shed.
Yard Sump Systems
There is one yard holding•sump,at Riverbend Steam Station.
• Yard Sumo
The yard sump is located between the coal yard and cinder pit, on the north. The drainage basin
forthe yard sumpicovers about 22-acres. Effluent from the yard sump is'puinpedto the ash basin
-through a 30 inch diameter ductile'iron pipe. Emergency overflow would goto-Mouritain,, sland•
Lake via a,24 inch diameter CMP. Thi's outfall,is designatedras,NPDES'Outfall,002a.
Area Description
Inflow to°the .yard sump is collected from ,the powerhouse, the ,plant ryard, tlied coal ,yard,"and the
,septic tank system. ;Roof drainage comes from approximately 1.3 acres of -the powerhouse roof.
From inside the powerhouse, discharge from turbine room sumps and floor -drains is,routed to the
yard sump. 'The plant yard covers about five acres and includes coal handlifig- facilities,,
warehouses; storage sheds, and the tractor maintenance house. These facilities have total roof
area of about' one acre. The coal yard encompasses 13 acres, and -runoff 'is routed to the yard
sump. There are; -approximately 2,900, feet, of railways and 1,700 feet of paved/gravel roadways
within the basin: Paved and roofed areas -represent about 25 pefcent.of the,drainage basin.
'Significant Materials / Controls
.Oil: PCB' contaminated mineral. oil collected from various Duke Energy, locations is 'brought
to Riverbend and used as fuel within the plant. The mineral oil is transported in 16;000 gallon
tankei;,,znd transferred to the 20,000 ;gallon, used mineral oil tank for storage. During transfer
from, the transporttanker to the storage tank, the truck parks within a berined area. Transfer
guidelines stipulate,that -the• drain within the ,hermed area,must be, covered' during oil transfers.
Gu_idehnes include procedures for prevention of oil spillage from thertr`ansfer hose and require
the transfer valve to be locked when not in use. The used mineral oil tank is located at the
northwest corner of the powerhouse. The steel tank is above grade and is, -,,surrounded by a
concrete containment pit capable of containing a total spill. The tank and pit are covered, to
prevent storm water collection.
A smaller used oil tank with 2,000 gallons of storage capacity is located east-of.the paint and oil
warehouse. Used oil from miscellaneous plant and maintenance operations,is pumped from 55
gallon drums into this -tank. When the used. oil tank is nearly full; the coritent-,are'transferred-to a
transporttanker for off -site ,disposal. There -is a4steel containment spit beneath the tank which
would' provide partial containment.
New and, used oil is stored' iri'S'S gallon, drums throughout the plant. Drums are?stored: inside .the
tractor maintenance, building, coal `handling facilities, the oil and paint warehouse, and in the
turbine floor. New oil' drums are stored 'in a covered area outside the oil and "paint warehouse,
and the floor slopes down towards the plant,yard. A total of approximately 60 drums of used and

new oil -,are stored within this drainage area. :Oily, waste
turbine floor.
Riverbend Steam Station; Gaston County
NPDES Permit,#•NC0004961
Page 17 of, 20
is stored on the, southeast end of -the
There are -three refueling stations for bulldozers, locomotives, and company -vehicles. The fuel
line to the bulldozer, and -locomotive stations -is enclosed within, a PVC pipe;, which drains to the
light -off tank containment pit. The. locomotive refueling station is located directly over, a
drainage ditch going -to the `_yard sump. Gasoline 'is ;supplied to -company vehicles from, a 1,000
gallon underground storage tank.
A transformer associated with coal handling activities is located at the junction house and
contains 197-gallons of oil. Two transformers associated with the precipitators are located,on the
north side of the powerhouse, and each, contains 205 -gallons of `oil.
Chemicals:
A 750',gallori,,su1'furic.acid tank is located at the northeast, corner of the powerhouse; The tarik.is
surrounded by an earthen berm: Both sulfuric acid and sodium hydroxide -are- unloaded -in this,
area. The 12,000 gallon sodium hydroxide tank is located in the -basement of --the powerhouse.
DOT procedures are followed during unloading.
Varibus chemicals are stored in 55 gallon drums throughout this drainage basin. A few drums
are stored in the ,tractor ,maintenance garage. These drums contain, anti -freeze ,cleaners and
. 1,
Steam Jenny compound. Approximately 20 drums of oil are stored'in the covered area.outside
the oil and paint warehouse. Empty drunis are stored outside the warehouse:
Hazardous Waste:
Hazardous wastes, am placed' in=a,satellite a ccuifiUration,area'in a small "shed to the west of the oil
and paint warehouse. 'The floor of the shed is, constructed to provide containment to -a depth of
four inches which should be sufficient for the maximum volume of waste•stored..
Wastewater:
Plant -wastewater from equipment discharges-, floor drains, sumps,, etc. is.routed •to the,yard sump.
If case.an oil and/,or chemical spill were to -occur, this spilled material will be captured and routed
to the ,yard, sump. Liquid &fflnent from the,' septic tank system pis •routed to, the ,yard sump.
Discharge from. the yard sump is piped to the, ash basin. Effluent from the boiler room sumps is
pumped above ground through this area.to the.ash,basin.
Ash: Ash is sluiced in piping above,grade through this drainage, basin to the _ash settling,basm.
Hazardous and Toxic Substances,
Hazardous aridToxic Substances Table 2c--3
At RB, the potential'for toxic.and hazardous substances being discharged is very low. In
reference to Item V-D of Form 2-C, the.substances identified under Table 2c-3 that may be. -in -the
discharge -are as follows: Acetaldehyde; Aniline,-, Asbestos, Benzoyl Chloride,'Cresol,
Cyelohexane_, Cyclohexanone, Formaldehyde, Styrene, Tiiethanolamine, Vanadium,and
Zirconium.

Riverbend Steam Stati6n, Gaston County
NPDES Permit i NC0004961
Page 18 of'20
Other- During the course -of theyear-products such.as commercial ,cleaners.and laboratory
reagents may be purchased which contain very low levels of a substance found in Table 2c-3. Ii
is not anticipated that these -products will impact the ash basin's capacity to comply with its
toxicity limits, since�their concentrations would be,extremely low:
40 CFR 117 and CERCLA Hazardbus,Substances
The following table identifies-hazard'ous,,substances located on -site that may be released -to the
ash basin during a spill in quantities equal to or greater than the reportable quantity, (RQ) levels
as referenced in,40 CFR 117, 302 and 3,55. This list is being provided "in order to qualify for the.
spill. reportability exemption providedunder 40 CFR 117 and the Comprehensive Environmental
Response Compensation and Liability Act (CERCLA)., These values,below represent the
maximum quantities on -site that -could be released at onetime and senttotheashbsiThey-do
not reflect quantities that.may be discharged through typical use.
Substance _ Quantity4lbs:) Source
—
talcium Ilypijclilorite 32.5 Warehouse
Hydrazine 750 Warehouse
Sodium hydroxide 18,765 Tank
Sulfiuic Acid 5,004 Bulk Storage Tank
Riverbend Steam Station 316(a) Determination
Duke Energy's'operating experiencesduring the past,five years under the thermal limitations
imposed in NPDES Permit,No. NC#0004961 substantiates,EPA's 34,6(4) determination (May
1'975) for Riverbend that the '"thermal,component;of `the discharge. assures,the protection,and
propagation of shellfish, fish and•wiidlife-in and<on the receiving body of water."'
In Duke's judgment the operating characteristics of the station have�a minimal effect on the
aquatic environment,of Mountain_Island°Lake. The character of the "thermal discharge has not
changed since `the original 316(a) determination. Accordingly, Duke,requests that the thermal
'limitations as,modified in the,present permitbe continued.
Riverbend Steam -Station 316 (b) Review
In conjunction with the rulemaking process for the.new Phase II 31'6(b) rule pertaining to•fish
impingement -and entrainment,.historical data and permitting, records, were reviewed. initial
316(a) and 31,6(b) studies associated with enactment of 'the Clean Water Act concluded -that the
location, construction, capacity, and d_esign,of the cooling water intake were not detrimental to the
aquatic ecosystem and,minimize,adverse environmental impacts. Both North,Carolina and EPA
regulators concurred in 1976 that 316(b) fish impingement and° entrainment studies were,no
longer needed at that -time. Currently the,Phase II' 316(b) rule for existing facilities ihavwas
remanded will be rew_rittenbyEPA and is expected to -be published for public comment°in-2009
,or, 2010.

Riverbend Steam Station, Gaston -County
NPDES Permit# NC0004961
Page ,19,of 20
,Ash Basin Canaci
Part`II _A(8:) of the existing NPDES permit -requires the, Dermittee ,to provide, and maintain at all
times.a minimum free water-volume,(between•the top. of the sediment -level and the;minimum
discharge elevation) equivalent to, the sum of the'maxiinum 24 hour plant discharges plus all
direct rainfall and all runoff flows to the pond,resulting from=a 10 year_,-2'4 hour rain fall' event,
When using, a runoff,coeffieient of'1.0.
-Determination of Wet Weather Detention Volume: Wet Weather • Detention Volume.is the'sum of the
runoff accumulated in the ash basin which results from -a 1'0-yr 24=hr storm (assuming 1,00% runoffj
plus theimaximum 24-hr dryyweatherwaste stream-,which-dischargesto the Ash Basin (refer.to
NPDES Permit NC0004961)
4.1 Estimate Runoff to the Ash Basin from-a� •10-yr 24=hr storm:- t
1. Natural'Drainage Area of Ash Basin = 98.7 Acres
Station Yard Drainage Area Pumped to Ash Basin = 24.8 Acres
Total =, 120.5 Acres
2-. Precipitation from 10.yYf24-hr storm, = ;5.0 Inches
-3. Total Stormwater Runoff to Ash Basin = 50:21_ Acre-feet
(Assuming'l 06%
riinbff)
Il. Estimated Maximum 24-hr•Dry WeatfiefVaste"Stream Di`scharging;to Ash Basin:
1. Maximum recorded Ash'Basin,Dischargea 10;660;000 Gallons/da
F2. Increase maximum daily disharge by 10% for
conservatism -and convert units to,acre-feet=��35�.98 Acre-feet--
III. Wet Weatfier Detention Volume:
Sum of Parts I: and II. _
2
86.19 Acre-feet
i

L
Riv&bend Steam Station, GastonCounty,
N_ PDES,Pe4nit#,NC0004961
Page•20 of 20
IV. Estimated Quantity of Solids (Ash) to be discharged to Ash Basin through December 31, 2015.
Note: NPDES Permit expifation.date is 2'/28/10.
Actual of
'
Estimated
Estimated
Estimated `
Coal.
Ash,
Ash
Consumption,
,Production
Production
Tim_ a Period
T000's-tons
%,Ash:
! (1000's,tons _
Ae-ftl
2009 r_
372.4
11,606%'
43-20'
36.07
2010
574:8
12.1k'
69.55
58.06
2011
679.7
11.90%
80:89
67.52
2012
574.3
11.80% ='
k 67.77
56.57
2013
4518
40.90%
49.36
41.20
2014-
477.7
10'90%'
5107
43..47
,
2015
4 1.0
10.90% ;�
50:46„ ;'
i_ __ 42.13�
Tota'1'
-322232, -���
����� -
;
l 308.95
*, Calculation,assumes an in-pj.lace,ash d1.ensity of 55 lbs. per, cubic foot.
*Estimated volumes and weights taken from 2009 CCP Ten Year Plan; Regulated
V Estimated Total -Storage Volume, Required through 20,1'5:
Wet Weather, Detention Volume =
86.2,
Acre -Teets
Estimated Solids to Ash Basin =
_ _ 309.0
Acre -'feet'
-Total.=
�. _ '395.1_Acre-feet �!
VI. Results -
Primary Cell
132.E
Acre-feet
Secondary Cell
369.E
Acre-feet
2007-2008,Ash Removal Project
393.6
Acre-feet
Estimated Solids to Basin Oct. 2005 - Dec. 2008
328.6
Acre-feet
Total
567, I
Acre -fee
Nbte: Available Storage 'based.onbasin survey, dated 19/28/2005
Required Storage Volume. Through, 12/3 1/2015: — 395:1 Acre-feet_
Based on these calculations, there,is,suffcient capacity'in the ash basin to,provide the
retention volume specified in the permit through the year 2015.

� , r
�Iy
/ r.�apt\ .�i 1111111111��'I
iy � � ` IIIIIIIIIIIY
' • �' IIIIIIIIIIB
IIIIIIIIIII9-
JWIN
nnwoun
11117l�IIIBI
.1l
�i�iWV M � AllI+
ae►! i
ice, I
�� uu�eeelan
N ,
PO

r
Return Aecelirt Fee
(Endorssment Required),
Q
p
Restricted Delivery Fee
(Endorsement Required);
S
'
Total Postatg�e & Fees;
CID
a- W�a-yp
grp3L�MYxT/li�•
M1 -Q��Po�
g
4,4
rwufe
�6t Complete,it is 1 -2}` nd 3. Aisc -4M ,lets i, 0 Agent
ae
;)(
ltei �3 f1stctl;il>fivaty:lsfdirred.,
!1I Ptintypur;`n�tt'i�`end`�diiress
,cat;<ir�lt iith�,� E� +ati''„
otDelivery
;.• _ y :
so°that_�
i Attach ;this caidto the,backof'tii�e�rngilpiecs,,
or,;&Ahe tront,lf;spOe percnfts. -
-,
rJiNer�ntiroin ;felts t4 ❑ 'ea
t{ye"ry uridi .
Addressed to
',H,YE9genteit{tiiE?od mar" o
1. Article
Y
Ike
I Ceiiijiad Mpll" C� Btpi s l!ieii , for iVtezchaaAlit
` r1�Raaei(it
`�C./� • , �r� %l� �— �`��� / 40'[ 7
4. Restricted DelNeryT ( Fee;' ❑Yes
__o r - 700_
_ �T - _
2, =Article Number 8
,1140' 0,00.271 218 4311
_ __ _ _ _ � --
mransfer from servlce lebeq
2004
PS Form 3811, February