NC0004961_Renewed/Reissued_20140519

DUKE
ENERGY
May 15, 2014
Mr Jeff'Poupart
State of North Carolina
Department of Environment and Natural Resources
Division of Water Resources
Water Quality Permitting Section
1617 Mail Service Center
Raleigh, North Carolina 276994617
Environmental Services
Duke Energy
526'South Church Street
Charlotte, NC 28202
Mailing Address
Mad,Code EC13K/ P d Box 1006
Charlotte,,NC 28201-1006
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Subject- Duke Energy Carolinas LLC — NPDES Permit Application
Riverbend Steam Station - #NC0004961
Dear Mr Poupart
Duke Energy requests the subject permit be renewed and reissued The above referenced
permit expires February 28; 2015 As'mandated by North Carolina Administrative Code 15A,
'NCAC 2H'01 05,(e), this permit application for - renewal is being submitted at least 180 days prior
to expiration of the current permit
Please find enclosed ,in triplicate, the renewal application, which includes the following Items
EPA Form 1
EPA Form 2C
Site Maps
Water Flow'Diagram
Supplemental Information
Fish Tissue Monitoring Results
In- Stream Monitoring Plan
Generation operations ceased on Aprih 1, 2013 Therefore the 316 (a) thermal variance for
Outfall 001 and a free water,volume calculation for Outfall 002 are no longer needed
Also enclosed, as requested, is information pertaining to .the seeps at the Rlverbend Steam
Station Please find attached a location map, flow measurements, analytical data and a
monitoring plan Attached Is a check in the amount of $860 for the permit modification fee
Duke Energy requests that-these seeps are formally evaluated and Incorporated into the final
NPDES permit and associated ,fact sheet The ,low volume of water characteristic of each seep
location (including seeps where visible flow is non, = existent,at times) coupled with the relatively
low constituent concentrations in the samples, suggest that there is little potential to influence
the water quality standards If reasonable potential analyses demonstrate that there Is no
potential to exceed water quality standards, then Duke Energy proposes to re- evaluate the

RBSS seep locations listed in this document annually over the next 5 -year permit cycle These
annual evaluations would be documented to verify the condition of the existing seeps and
.determine the presence of any new seeps, and would' be provided annually-to DWR DWR will,
be promptly notified if any new seeps are identified or any significant changes are observed for
the existing seeps If any existing or newly identified seeps demonstrate reasonable potential to
exceed a water quality standard, Duke Energy will do one of the following 1) stop the seep, 2)
capture and. route the seep so that it is discharged through a, specific NPDES
numbered /permitted outfall or 3) address1he seep using ,Best Management P,lans,approved by
DWR
Information related to groundwater is included to provide an understanding of the Riverbend ash
basin groundwater monitoring network,, the nature of groundwater flow regime around the
Riverbend site, and potential on -site and off -site receptors, Please find, attached an introductory
groundwater monitoring program reports and recommendations letter, receptor,survey,
Sampling, Analysis, and Reporting Plan, generalized groundwater flow direction figure, and
proposed well locations, figure The referenced documents are included to describe the current
state of the groundwater monitoring program,and any changes to the existing monitoring plan
Changes to the current program (mcl'uding mstallation,of additional observation of monitoring
wells) which are proposed by Duke Energy in the,future, may be allowed following consultation
with NC'DENR and should not require a, re-opening of the Riverbend NPDES permit
Duke Energy also requests notification that this application is complete
The following monitoring, reductions�at Outfall 002 are requested based on historical monitoring
data
• Total Copper— eliminate monitoring requirement, since no boiler chemical,cleanings will
be performed
• Total Iron - eliminate monitoring requirement, since no boiler chemical cleanings will be
performed
• Total Nitrogen — reduce monitoring frequency from 2 /year to 1 /year.
• Total Phosphorous — 'reduce monitoring frequency from, 2 /year to 1/year
• Flow — reduce from weekly to monthly
Duke Energy also requests that the in- stream lake, monitoring upstream and downstream; of the
ash pond discharge be!reduced from semi - annually to annually based ion the attached historical
results

Thank you in advance for your assistance on this matter Should you have questions regarding
this application, please contact Allen Stowe at (704) 382 -4309
Sincerely,
AU-
Jas n Allen
Senior Vice President
Environmental, Health & Safety
Attachments

Inw:ce Number
05151014m,000W
(.1 N( I It ADAMS r0 III( K -UP
endor Number 011110071960 Name NC DLNR - NOR I H CAROLINA
Invoice Date Voucher ID Gross Amount
May/1512014 10648444 86000
Discounts Taken Late Charge
000 000
MI 17x6'_
Ps:d Amount
96000
Total l otal 1 otal
I otal
C Cross =Amount Discounts Late Charges PatdAniount
heck Number Date
1111111117962 May /15(_1114 _
$86000 $000 '$000 $86000

Pleaseiprmt or type In the unshaded areas only
Form Aooroved .OMB No - 2040 -0086
FORM
1
US ENVIRONMENTAL PROTECTION AGENCY
1 GENERAL INFORMATION
I EPA I D NUMBER
5T
, ' •
T /R' —L"
\'iEPA Con "sohdated PermltsiProgram
F-
NC_ 0 0 0 4 9 61
D
GENERAL
(Read the "Geireral his traction c hgforestarnng)
1
_
12 13
td 1 15
LABEL ITEMS "° �R" '? GENERAL INSTRUCTIONS
�' �Wmel� If a prepnnted label has been ,provided, affix d m the
_ r� � desi nated s a
�E-. _ g space Review the information, carefully, if any of rt
I - PD +NUMBER r t'r ~a� °.3 _, �r y is incortecl, cr`oss'through it and enter the,coirect tlate in, the
m ,,, i .` 4 appropnate fill- ,rfarea below Also, if any,of the prepnnted data
�'�' '1 �_� ,. �.�� is absent (the area to the left of the label space lists the
jllli r ,NAME- EPLACE §L7ABBIN THIS +SPACE` s�'' to /orrnabon that should a ear iii the
), please provide it proper
� „ fill -iri areas) below_ If the label is complete and correct, you
�4
n� IT SAIL NG c -° o fi.,ix S-1 % need not complete Items''I, III' V and,Vl `(except VI "B which
��AD�DR SS„ �. * ';s � a '"' %'� ^'' - ''-a; .� _ • c'' j�* �' ' � � r :" & must'be completed regardless) Complete all items if'no label
"e'a= =''5i' ��",-�- ,r d'= "5ri;�xa "a has, been provided Refer to thedmstruc6ons for dateiled item
w °��
Srt�; ?e'.c,s-� y,�'� ,t,' v#TSI'>µ„isr- 'i .. "k descnphons and for the legal authonzatwns under which this
FACILITI LOCATION ,px � . 3 z - }� � �`
4 s'3;tid ^ -.Tz'_ ' -;° - - ` "`` ; es�_. data is collected
II POLLUTANT CHARACTERISTICS
w .., "•,.,, . �«ns ;.. �.. .ssxe u.
INSTRUCTIONS Complete A through,J to determme whether you nee&to`submd anyiper`mlt application forms to the EPA -If yo`uianswer -"yes" to any'quesbons„ you must
submit this4orm and, the'suppleniental form listed`in tt b bdr `enthesls,followinglthe,quesbon Mark "" m the box In the third colum`,d,the supplerrental,form is attached If
you answer'no"'td each question, you need not submit any of these forms You may answer no if-your actrol3y is excluded from permit requirements, see Section C of the
Instructions See also, Secbon D of the instructions for definitions of,bold -faced terms
Mark,
X'
Mark'X'
YES
NO
FORM
ATTACHED
YES
NO
FORM i
ATTACHED
SPECIFIC QUESTIONS
SPECIFIGQUESTIONS
A Is this facility a publicly owned treatment works which
results in a discharge to waters of the U S o 2A)
X
B Does or will this facility (either exlsbng or proposed)
animal feeding
(FORM
Include a concentrated operation or
agua$c animal, production facility which results In a
X
16
17
16 _
19
zo
z,
discharge'to waters of thelU'S_? (FORM,26)
C Is this a facility which currently results in drschar-ges to
D Is,this a proposed facility (other than those described In A
waters of the U S other than those described In A or B
X
X
or 6 ab whic
ove) h will result In a discharge to waters of
X
above? (FORM 26)
the U S 9 (F6FW� D)
25
ze
n
3z
z3
3<
E Does or will this facility treat, store, or dispose of
.X
F Do you or will you inject 4t this facility `industrial or
hazardous wastes? (FORM 3)
municipal effluent below the lowermost straturn
X
containing, within one quarter mile of the well bore,
underground sources of dnriking water? (FORM 4)
„
,:
v
ze
x9
3o
G Do you or will you,mject at this facility any produced water
H Do you or will you inject at this, facility fluids for special
or other fluids which are brought toi the surface In
X
processesrsuch as;rrilningtof,sulfur'by ttie Fraschiprocess,
connection-with conventional oil or natural gas production,
°enhanced
solution minirig of minerals, Iri'"situ' domliusbon of fossil
X
inject ids used for recovery of oil or natural
fuel, or recovery of geothermal energy (FORM 4)
gas, or inject Fluids for storage of liquid hydrocarbons
(FORM 4)
x
35
36
37
36
39
I 'Is,this facility ahproposed stationary'source which,Is one
J Is this facility a proposed stationary source which is
of the 28 Indust`nal categories listed in the instructions and
'any
�/
X
NOT one of the 28 industrial categories Listed In the
X
which will potentially emit 100 tons per year of air
instructions and which will potentlally emit 250 tons per
pollutant, regulated under the Clean Air Act and may affect
year of any a r,pollutant regulated under the Clean Air Act
m
41
42
CI
45
or be located in,an attainment areas (FORM 5)
and may affect or be located In sn attainment areas
,(FgRMyS)
III NAME OF FACILITY
�ic
S KIP
Riverben Steam Station &
_ a
IV FACILITY CONTACT
A' NAME & TITCE (la' 'frii„R "n7e
z
Stowe, Allen,/ Lea Environmenta Specialist
( 0 ) 3 2 -4 .09 n _
15
1 16 ., i'1.- ai.niL < 4C..- �5'.
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V FACILTY MAILING ADDRESS
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3
'P . O . Box 1"0 0'6
..pp,,��__ •-,fix. ,r �l,3
B CITY OR TOWN _ C STATE _D ZIP-C_ ODE v
4 'Charlotte C 1 2 J2 �l
d]
VI FACILITY LOCATION
A STREET, ROUTE'NO Of2�OTHER�'SPECIFIC IDENTIFIER � ' "' m`� f #� M - ��,r"`'• � `,� _ -
5 1 5 Steam P--ant Road " J
'15 ,16 45
B COUNTY NAME
Gaston „
ro
C ,CITY OR TOWN
D STATE
E ZIP CODE
F COUNTY CO_D_E (rfknom'n) , . °9ij
s M u -t H l y
�C
2 11 1 `0 I
J I I 1
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EPA Form 3510 -1 (8 -90) CONTINUE ON REVERSE

CONTINUEDIFROM THE FRONT
SIC CODES'44 d in order of- non
A FIRST` „�,�.. _ , - '" `B'SECOND;
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(specify)
�)
IS
911
IB 19
c Services 7
15
1fi 19
C THIRD D FOURTH
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(,pec f,)
(,Pecfy)'
7
IS
i6 19
lsi 16 19
_
VIII OPERATOR INFORMATION
" �A NAME - T'
B Is th "elname listed in,ltem
`
Duke Energy Carol_inas, 'LLC '(Attention: 'Allen Stowe)
VIIIJA also "the owner?
p YES ❑ NO
Is MW
C STATUS OF OPERATOR (inieiire appropnale letter into the answer box rf "Other,' rpech,)
D PHONE (area code & n`o)
F = FEDERAL (specify) 1 `
S =STATE M= PUBLIC(otheriranfeVeraldrstaie) kpA (704) 382 -4309
P = PRIVATE O = OTHER (speck)
6• is a 1. 1 19 r, n z6
E STREET OR,P O BOX
v -G�` .;�.. q -ter ' • „s`x "Y n,
P.0. ox 1006
F CITY OR TOWN
G STATE
H -ZIP CODE
JIX INDIAN LAND
s thefacility , located onlnd igh,,land0
Hic�
NC
2Charlotte
280
11 YES
SI2
a] 51
X EXISTING ENVIRONMENTAL PERMITS
A NPDES Dischar es to Su ace Kner
r%
'• .�D P,SD', AvGnrlvons fron'rPro osed'Saurcet
.tr3 1e ,�, �:�,.
C
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1 17
18
B ,UIC U,V1,4o«rrd6r eciF4l7l dl
E OTHER (s ecijy
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1
W 0000452
(specify)
9
U
9
-
Distri_ ut>_on of Residual Solids
-
is
1a
'1]
le 30
is
' 16
n
m 30
C RCRA Ha_ardous Wavr
E OTHER (specify)
C
9
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NCD02'4717423
C T 1
9 Specify)
X15 16 17 118 30 W1 ,18. x17', 18
XI MAP
- '•n =a >~nc'� -,y" - s•�Z .1
Attach to this *apphcahon a topographic map ofthe$erea`ezteridmg�to at least one;, le =`beyond'p�ope'rfy��boundane "s T,he map must showthe outimeof the facility, thel
Location of each of its existing andlprop - intake and'discfiar6e structures, each oCits hazardous waste treatment, storage, ot`dispoSal facilities, and each•well wheferit
injects Fluids' underground Include all spnngs, nders, and other s rrface water bodies i the rnap area SEe'•mstr_uctlons for precise iequiFements
XII NATURE OF BUSINESS (provide i beef descnption)
Coal fired steam electric generation (generafion,'operatioils ceased 4%1/2013)
XIII CERTIFICATION (see instruchons)
1 certify under penalty" of law that t have pe son'ally examined and am familiar with 'Se information,submitted rn -this apphcahon and'all attachments and•that, based on my
inquiry of those persons immediately responsible tbi obtaining'thevnforination contained imi6 application „`1 beheve that fhe information is true,�acct rate, and complete_ 1
am aware that'there are significant penalhes forsubmittin'g false information, including the pos'sl&hly of fine and imphi onment
A NAME'& OFFICIAL TITLE (type orprrni)
B SIGNATURE
C DATE SIGNED
Robert L. Drum / =Superintendent
Operations
COMMENTS FOR OFFICIAL USEIONLY
15 19 kgm_,
EPA Form 3510 -1 (8 -90)

t!
41C
`
A
J1
(ER F1
DIRECTION'
DUKE ENERGY
-- -, , I
PROPERTY Ll
0
14
002
RIVERBEND
STEAWSTATIO
�T
Ul
(?;u
—j"
, v
REFERENCE:
BACKGROUND DATA: USGS TOPOGRAPHIC QUAD, MOUNT ISLAND LAKE AND LAKE NORMAN SOUTH 0 0.5 1
.NAD 83, METERS WAS OBTAINED FROM NC ONEMAP GEOGRAPHICAL INFORMATION (GIS) WEBSITE. mnnnmimr:::= Kilometers 01
THE PROPERTY DATA WAS OBTAINED FROM THE GASTON COUNTY NORTH CAROL114AGIS DEPARTMENT.
PLEASE NOTE THIS DATA IS FOR INFORMATIONAL PURPOSES ONLY. IT IS NOT MEANT FOR DESIGN, LEGAL, 0.5
0
OR ANY OTHER USES. THERE ARE NO GUARANTEES ABOUT ITS ACCURACY S&MEj ASSUMES NO NC. Miles
RESPONSIBILITY FOR ANY DECISION MADE OR ANY ACTIONS TAKEN BY THE USER BASED UPON
INFORMATION OBTAINED FROM THE ABOVE DATA.
(17-74) 17idk!&'M�s 7— gL;Sjug"
SCALE: AS SHOWN FIGURE
LOCATION MAP NO.
DATE: 06-08-2009
Duke RIVERBEND STEAM STATION
DRAWN BY: RDP NPDES # NC0004961
r9yPROJECT NO: Ene RIVERBEND STEAM STATION
L 1411-08-140 * GASTON COUNTY, NORTH CAROLINA

EPA I'D NUMBER (copyfrom /rem l afl-ornr 1) Form Approved
Please print or a in the unshaded areas only NC00'04961 OMB No 2040 -0086
p type y Approval expires 3 -31 -98
FORM US ENVIRONMENTAL PROTECTION AGENCY -
APPLICATION FOR PERMIT TO DISCHARGE WASTEWATER
2C N&A EPA EXISTING MANUFACTURING, COMMERCIAL, MINING,AND SILVICULTURE OPERATIONS
NPDES dons o6dated Permits Program
I OUTFALL LOCATION
�,, -. -u�
For each outtall, list the latitude _and longitude of ds locatton�to the`nea�_est -15 secoriiis and ihe'name of,t_F_ie receiving water _
A OUTFALL NUMBER
(list)
B LATITUDE
t LONGITUDE "
D RECEIVING -WATER (name)
1 DEG
2 MIN-
-3 SEC
1 DEG
2 MIN
3 SEC
001
35
.29
80
80,
58
13
Mountain Island Lake (Catawba River)
002
35
22
3 •99
80
57
32 3;8
Mountain Island Lake (Catawba River)
002A
35
21
51
80
58
20
Mountain Island Lake (Catawba River)
11 FLOWS, SOURCES,OF POLLUTION, AND TREATMENT TECHNOLOGIES
A Attach aline drawing showuSg the water flow through`ttie,faaGty Jhdicate sources `of intake water, opdFation -s contributmg;wastewatef' to,ttie effluent, and treatment units
labeled,to'corresporid to,the more detad'ed:descnption9,m Item B 'Constrict a,wat`e'r balance on th`e hrnd,drawing by,showing average flows,between,mtakes, operations„
treatment•units,,and,outfalls If a`waterdbalance cannot lie determined (e g,,for certain mining achwties), provide a pictonel descnption of, #i nature and,amount of any
sourcesgof waterand,anyrcollection or treatment =mea"sdres
B For each outfall, provide a descnption;of (d) Alf operations c'ontnbuting wastewafer to the effluent, nncluding process wastewater, sanitary wastewater, cooling water,
and -storm water runoff, (2)'The average flow contributed by, each operation, and (3) The treatment received by the wastewater Continue on iaddiiional sheets if
necessary
1 OUT
2 OPERATION(S)�CONTRIBUTING,FLOW
3 TREATMENT
FALL
NO (list)
a OPERATION (list)
b AVERAGE FLOW
(include units)
a'DESCRIPTION
b LIST -CODES FROM
TABLE;2C_ -1
001
Condenser cooling water
No Flow
No flow because of plant,shutdown,
N/A
(once Through non - contact)
-
Includes intake screen backwash
002
Ash basin discharge
0 185 MGD /Intermittent
2D
lu
4A
002A
Yard Sump Emergency Overflow
Intermittent
4A
OFFICIAL USE ONLY (effluent guidelines sub - categories)
EPA Form 3510 -2C (8 -90) PAGE 1 of 4 CONTINUE ON'AEVERSE

CONTINUED'FROM THE FRONT
C Except'for,storm runoff, leaks, or spills, are any of the discharges described in Items II -A or B intermittentor seasonal?
© YES (complete the follmt org table) ❑ NO (go to Section °Ill)
3 FREQUENCY
4 FLOW _
a DAYS PER
B ,TOTAL VOLUME
2 OPERATION(s)
WEEK
b MONTHS
a FLOW RATE (ut mgdj
('Peck a ah antis)
1 OUTFALL
NUMBER(hst)
CONTRIBUTING,FLOW
(hsi)
(speck,
arerage)
PER YEAR
(spectfj,9 --ge)
1 LONG TERM
2 MAXIMUM
1 LONGTERM
2 MAXIMUM
C DURATION
( °fdys)
AVERAGE
DAILY
AVERAGE
DAILY
002A
See Supplemental Information
002
See Supplemental Information
Ill PRODUCTION
- ., .�, "rc� 'f,.rr�R"r
A` Does an;ef fluent guideline hmdation promulgated 6y EPA under - Section 304 of the Clean Act apply to facility?,
Water your
❑ YES (complete Itemlltl -B) NO (go to Section 10
B Are the limitations in the applicable effluent guideline expressed in terms of production (or other measure of operation)?
❑ YES (cmnplele Item 111 -C) W] NO (go to Section IV)
C If you answered "yes" to Item III -B, list thie,'quant ty which represents an actual measurement of your level of production, expressed In the terms and units used in the
applicablereffluent guideline, and'indicate the affecte&outfalls
1 AVERAGE DAILY PRO_ DUCTION
2 AFFECTED OUTFALLS
(list omjall ntonhers)
a QUANTITY PER DAY
b UNITS OF MEASURE
c OPERATION, PRODUCT, MATERIAL-, ETC
Irpecify)
NA
NA
NA
NA
IV IMPROVEMENTS
A Are you now' requlredrby` any- Federal, `State `or local'auttSont°y to meet any 'Implementation- sctiedule"fof'the consVuctio`n,:upgrading "oI peHatlons of wastewater'
treatment equipment or practices,or any other environmental programs`which may affect the'discharges descrbed in'V s apphcation� This rn_cludes, but is not limited to,
permit conditions, admimstrative,or enforcement,o4ders, enforcernent compliance schedulelletters, stipulations, court orders, and grant or loan conditions
❑ YES (complete the following table) ©NO (go to Item IV -B)
1 IDENTIFICATION OF CONDITION,
2 AFFECTED OUTFALLS
4 FINAL COMPLIANCE DATE
AGREEMENT, ETC
3 BRIEF DESCRIPTION OF PROJECT
a NO
b SOURCE OF DISCHARGE
a REQUIRED
b PROJECTED
-NA iNA NA NA NA NA
B OPTIONAL You may attach additional sheets descnbmg any additional water pollution control programs (or other`enwronrilental projects which may affect your,
discharges) "you now have underway or whlch,you plan Indicate whether each program is now underway or planned, and Indicate your actual or planned schedules for
construction
❑ MARK "X" IF DESCRIPTION OF ADDITIONAL CONTROL PROGRAMS IS ATTACHED
EPA Form 3510 -2C (8 -90) PAGE 2 of 4 CONTINUE ON PAGE 3

EPA I D NUMBER,(copyfrom /lens 1 oflbrm t)
CONTINUED FROM'PAGE 2 NCO 0 04 9 1
V ,INTAKEjAND EFFLUENT CHARACTERISTICS
A „B, & C See'instrucons tiefore proceeding, — Comple te'one set o f'teble s fog e c't'tfell ` Annotalet a o tfall nurnberin the spce provided ” ' '_r -' " - - `
V NOTE Tabe , , on separate- heets n_umtiered V -1 through V -9
D Use the space below to,list any'of the pollutants listed in Table 2c -3 of the instructions, which you know or have reason to believe'is discharged�or may'be discharged
from any outfall For every pollutant you list, briefly describe the reasons you believe it to be present and report any analytical data in your possession
1 POLLUTANT
12 SOURCE
1 POLLUTANT
2 SOURCE
For identifcation of Table
'
2c -T substances, see attached
supplemental information
VI POTENTIAL DISCHARGES NOT'COVERED
BY ANALYSIS
Is any pollutant fisted in Item V -C,a ^substance
or a component of a sutisiance'whc_ h$5' currently use'b� manufacture as anlint'errn
d&aIe or final, product'or byproduct?
❑ YES (hstall such pollutants
below NO (,go'to Item VI-B)
EPA FormI3510 -2C (8 -90) PAGE 3 of 4 CONTINUE ON REVERSE

CONTINUED FROM THE,FRONT =,- _ t
VII BIOLOGICAL TOXICITY TESTING DATA
Do you have any knowledge or reason to believe that any biological test for acute o' chronic'toxiaty hasSbeen made on any of`your discharges or`on a receiving water m
relation to your,discKarge hithimihe last 3 years?
w© YES,Qdeiul the test(s) and describe their purporer he /ow) El NO,(go to Section VIM
Chronic toxicity tests are conducted quarterly per calendar year on NPDES outfall 002 These tests use
Ceriodaphnia as the test organism Test results indicate that the discharge of outfall 002 is non -toxic
VIII CONTRACT ANALYSIS INFORMATION
Were any of the analyses reported in Item V performed by a contract laboratory or consulting +firrn�
® YES (list the tame, addresc,oncl,telephone number of and pollataniv,analyced by, ❑ NO (go to Section M
each such laboratory_orfirm,below)
A NAME
B ADDRESS
C TELEPHONE
D POLLUTANTS ANALYZED
(area code R no
(list)
Shealy Environmental
106 Vantage Point Drive
803 -191 -9700
cyanide,total
,Services,Inc
West Columbia, SC 29172
phenols,BOD,bromide,sulite,
color,MBAs,SVOL EPA
625',PCB,fecal,VOC EPA
624,pH,temperature,TRC
SGS Environmental Services, Inc
5500 Business Dr
910 - 350 -1903
Dioxin
Wilmington, NC 28405
GEL Laboratories LLC
2040 Savage Road
843 -556 -8171
Radiological
Charleston, SC 29417
Pace Laboratories
9800 Kincey Ave ,Suite 100
704 -875 -5245
oil & Grease
Huntersville, NC 28078
Duke Energy Analytical
13339 Hagers Ferry Road
980- 875 -5245
TKN,nitrate- nitrite,COD,
`Laboratory
Huntersville, NC 28078
fluoride,sulfate,metals,
TOC,TSS
IX CERTIFICATION
I certdy under penalty of law that this +document
and all attaditnents' were prepared under my direction
or supervision m accordance
wiwith a system desgned tto assure tFia'' "L
qualified personnel properly gather,arid evaluate
the nformahon submitted Based on myYinquiry
of &,p`erson or persons,whd
manage the system or those per'son's
directly responsible for gathering the information,'
the tiformabon submitted is, to the best of my knowledge
and belief, true, accurate,
and complete 1 am aware`that there
a_re signi(cant'penallies forsubmthng false inform
abon „mcluding,the'possitiilit of fine and,impnsonm_entforknowing
violations
A NAME & OFFICIAL TITLE'(type orprint)
B PHONE °NO (area code d no)
Robert L Drum - Superintendent of Operations
(704) 263 -3217
C SI E
D DATE SIGNED
EPA Form'3510 =2C (8 -90) PAGE 4 of 4

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Supplemental Information
General Information
River,bend Steam Station (RBSS) was a coal -fired electric generating.plant owned and operated by Duke
Energy Corporation, LLC. RBSS is located at 175 Steam, Plant Road,,six miles northeast of Mount Holly, N.0 ,
The first three RBSS operating units were retired in the,late 1970s. 'Units 4 and 5 were each capable of
generating 94,000 kilowatts of electricity. Units 6 and 7 were rated at 133,000 kilowatts'each. All units
were retired as of April 1, 2013. The station is currently being decommissioned and the plant facility will
ultimately be demolished
,In addition to the coal fired units, four-combustion turbines supplied 30,000 kilowatts each for use during
,periods of'peak demand for°electricity'. These,corr bustion turbines used oil or natural�gas °to heat
compressed' air, which expands and drives a turbine generator to produce electricity. These combustion
turbines were retired.on October 1, 2012.
Outfall 001— Condenser Coolins Water ICCWI
The CCW system was,a once through non - contact cooling,water system which removed heat from the
,condensers,and other selected heat.exchangers. Raw water from the Catawba River passed through the
condensers and auxiliary equipment -on a "once- through" basis to cool equipment and' condense,steam
exhaust from the turbines.
'This system was retired from service when the plant closed down on April 1, 2013. A small amount of
Water (< 0.1 MGD) enters this closed piping system from the,plant chiller system. However, sampling at the
end of pipe cannot be performed,because the lake surge into the ten foot diameter outlet pipe co- mingles
with this small amount of water`in the pipe well prior to discharge
Outfall 002 — Ash Basin
The ash basin at Riverbend accommodates flows from the yard drainage sump, boiler room sump and non -
point source stormwater. Total average influent from these sources combined &approximatel,y 0.185
MGD, a significant reduction from the 2009 average flow of S MGD. The average,flow rate is expected to
continue'to decrease as decommissioning activities proceed. No discharge flow was observed from,lune-
N'ovember of 2013 At times, due to rainfall, evaporation and seepage of ash basin ponds, the,amount of
effluent could be quite different from influent volumes,
pH Adjustment
During warm periods of the year, algae blooms occur in the ash basin causing pH levels to rise. A COZ
system is,utilized during these,events to maintain the pH level between 6.0 and 9.0 standard units.
Alternatively, an acid injection system utilizing sulfunc,aad and a "sodium hydroxide infection system may
also, be used for;pH adjustment.

Yard Drainage�Sump
The yard drainage sump is a large concrete structure,that has four level control pumps that direct
Wastewater from RBSS 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 a backup After a preselected
period, the controls are changed so that,different pumps,are utilized
The yard drainage sump collects wastewater from many sources, including sanitary system, groundwater
remediation system and turbine room sumps. The yardArainage sump also collects stormwater runoff
from the coal pile, rail access, powerhouse roof drains and paving Groundwater from, a foundation
drainage system under the track,hopper is also intermittently discharged to the yard drainage sump- The
combined average flow from all sources tied to the yard drain sump is approximately 0 139 MGD. This flow
rate is expected to decline as decommissioning activities progress.
Sanitary System
Plant sanitary wastes are treated by a series, of threet4,000 gallon septic tanks in parallel and a 1,200 gallon
holding tank. Sanitary effluent is pumped from the discharge 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 based on a maximum and average 300 and 150 people respectively. Currently,
less than 10 people typically use this system on a daily basis The average flow to the yard drain sump has
been approximately 0.0,01 MGD and is expected to decrease.
Groundwater Remediation System
This;remediation system was'installed in 1992. Groundwater'is pumped through an oil -water separator to
the yard drainage sump. Trace amounts of volatile compounds may ,be-in the wastewater, such as
naphthalene, chrysene, methyl,tertbutyl ether,,and bis,(2- ethylhexyl), phthalate The average daily flow
from this system m approximately. 0.003 MGD , A revised groundwater,corrective action plan has been
submitted to NC DENR that,specifies a treatment capaaty,of 0.03 MGD
'Turbine Room Sumps
`The turbine room sumps collect approximately 0.025 MGD of wastewater via a network of floor drains from
intermittent sources listed below•
• Equipment cooling waters (i.e. air compressors)
• Floor wash water containing janitorial products
• Boiler room sump overflow
• Emergency fire fighting water
• Chiller condensates
Railroad Track Hopper Sump
This sump collects groundwater from a foundation drain system underneath the track hopper This flow is
intermittent and the pump capacity is 100 gpm. On a daily basis, it was estimated that the run time was
50 %, which would ,correspond to a flow of 0.072'MGD. The current average flow estimate is 0.05 MGD and'
this,estimate is anticipated to decrease as decommissioning °activities proceed.
Boiler Room Sumps
The average,flow pumped from the boileriroom sumps directly,to,the ash basin is approximatelyA 025
MGD and is expected to decrease,overtime.

Outfall 002A — Yard Drainage Sump Overflow
An overflow pipe that directs flow from the sump to the 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 the pumps failed or redundant power supply lines could not be restored
in a timely manner. Given significant overflows, the wastewater could potentially flow into the Catawba
River This type of incident will rarely occur
Spill Prevention
Oil Storage
RBSS presently has three above ground storage tanks— one•4,250,000 gallon empty fuel o'il tank, one
27,000 gallon light -off fuel oil tank °and a 20,000 gallon empty;mineral,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 drainage area of the 4.25 million gallon tank as an
added precaution.
All oil storage tanks are presently covered under the Spill Prevention, Control and Countermeasures (SPCC)
plan.
Hazardous and Toxic Substances
Hazardous and Toxic Substances Table 2c -3
At RBSS, the potential for•toxic and hazardous substances being discharged is very low. In, reference to Item
V -D of Form 2C; the substances identified under Table 2c -3 that may be in,the discharge are as follows:,
acetaldehyde, aniline, asbestos, benzoyl chloride, cresol, cyclohexane, cyclohexanone, formaledehyde,
styrene, tr,iethanolamine, vanadium,and zirconium
Other — DuringLthe course of the year, products such as commercial cleaners may be purchased which
contain very low levels of a substance found in Table 2c -3. It'i"s not anticipated that these products will
negatively impact the toxicity limits at the ash basin discharge, since their concentrations would be very
low.
40 CFR 117 and CERCLA Hazardous Substances
The following table identifies hazardous 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 355. This list is being provided in order to qualify for the spill reportability exemption
provided under 40 CFR 117 and the,Comprehensive Environmental, Compensation and Liability Act
( CERCLA). The values below represent the maximum quantities on -site thauould'be released at one time
andsent to the ash. basin. They,d'o not reflect; quantities that may be discharged through typical use.
µSiilis #anceA »' °';.a_ T,z`T
giiantit "`'' Ifs` o �,:
;r $�d u
Calcium Hypochlorite_
32.5
Warehouse
Hydrazine
440
Water Treatment Room
Sodium Hydroxide
18,765
Tank
Sulfuric Acid
5,004
Bulk Storage tank

Fish Tissue Monitoring Results
Trace element concentration means (wet weight) of selenium, mercury,, and arsenic from sunfish
and bass muscle tissue from four- locations of Mountain Island Lake, 2009 — 2013, were within
ranges reported, from 1988 to 2008 (Harden and Reid 1991; Duke Power Company 1:994, Duke
Power 2001, 2004; Duke Energy 2009). Mean trace element concentrations ranged from 0.41 to
1 04 µg/g for selenium, from 0.'03 to 0.17 µg/g for mercury, and from 0.03 to 0.13' µg/g for
arsenic ,(Tables 1 -1 and 1 -2). All measured values were well below the North Carolina
Department of Health and Human Services ( NCDHHS) action levels for the protection of human
health (10.0 gg/g for selenium and 0.40 }tg/g for mercury; NCDHHS 2007) and the Division of
Water Quality's tissue screening value of 1.20 µg/g for arsenic (NCDENR 2006).
Please refer to the attached Fish Tissue Sample Location Map (Figure 1).
Table 1 .Trace element concentration means in sunfish muscle bssue,from four locations of Mountain Island Lake, 2009 - 2013
Se
-Se
Hg
Hg
Year
16 0
As
277:6
Year
16:0
2776
277.6
2760
ISO
277.6
27,76
276.0
16.0
277:6
277.6
1 276 0
2009
0,63
0'62
096
073
0,05
007
008
008
006
008
007
008
2010
0'41
0'41
050
049
006 _
006
004
004
Oil
010
007
006
2011
052
051
055
069
005
005
007
007
0105
0'05
007
006
2012
047
060
072
055
0704
003
004
003,
005
004
004
003
2013
0'50
0 61
0 58
0 45
0 09
0,09
009
-,005
0,10
0 ,10
Oil
007
Table 2 Trace element concentration means in bass muscle tissue from four locations of Mountain Island Lake,.2009 - 2013
Se
Hg
As
Year
16 0
2776
277:6
276:0
16:0
277,16
277:6 ,
276.0
ISO
277.6
2776
2760
2009
069
0 -76
0 88'
067
008
006
0,05
010
006
0107
010
008
2010
050
063
0 63
045
007
007
004
005
013
008
006
008
2011
063
0169
104
0181
.0 07
007
009
006
005
005
009
006
2012
1045
0,65
0193
055
0 4_
006
0,06
008
003
004
0 06
0 04
2013
062
058
076
0`51
01 7-
0 09
1 0,07
0708
010
' 0,10
007
1 &08

References
Duke Energy. 2009. Assessment of'balanced and indigenous populations in Mt. Island Lake
near Riverbend Steam Station. Duke Energy., Charlotte, NC.
Duke Power Company, 1994. Assessment of balanced and indigenous populations in Mt. Island
Lake near Riverbend Steam Station. Duke Power Company, Charlotte, NC.
Duke Power 2001. Assessment of Balanced and Indigenous, Populations in Mountain Island
Lake Near Rrverbend'Steam'Station Duke Power, Charlotte, NC.
Duke Power 2004. Assessment of Balanced and Indigenous `Populations in, Mountain Island
Lake Near Riverbend Steam Station. Duke Power, Charlotte, NC.
Harden, CW and SM Reid 1991. Trace elements in Mountain Island Lake water, sediments,
and fish Duke Power Company Research Report PES /91 -0'5. Huntersville, NC.
North Carolina Department of Health and Human Services (NCDHHS). 2007. NC fish advisory
action levels for DDT, DDE, DDD, Dioxins, mercury, PCBs, PBDEs, and selenium.
NCDHH NC Occupational and Environmental Epidemiology Branch Raleigh, NC,
April 2007.
North Carolina Department of Environment and Natural Resources (NCDENR). 2006. Standard
operating procedures. Fish tissue assessments. NCDENR, Division of Water Quality,
Environmental Sciences Section. Raleigh, NC.

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Riverbend Nn,= Stream 'Mon,itoring Plan 2011 - Present
In- stream Monitoring Requirement
A requirement to sample locations in Mountain Island, semi - annually, upstream and downstream of the
Riverbend Steam Station (RBSS).,ash basin discharge was implemented in'the March, 1, 2011 RBSS,
National Pollutant Discharge Elimination System permit under section A.15 of the permit. The
following document details methods and analyses of the monitoring program and provides the
monitoring data to meet this requirement.,
Mountain Island Sampling Locations
Mountain Island water sampling locations are depicted in Figure 1. The upstream location (278.0) is
approximately two miles upstream of the RBSS ash basin discharge The downstream location (277.5)
is, approximately 0.5 miles downstream of the RBSS ash basin discharge.
Sampling and Analytical Methods
Grab samples collected from the surface (0.3 m) of the upstream and downstream locations in Mountain
Island Lake were analyzed for the following parameters: arsenic (As), cadmium (Cd), chromium (Cr),
copper (Cu), mercury,(Hg), lead (Pb), selenium (Se), zinc (Zn), and total dissolved solids (TDS).
Storage and' preservation techniques of the samples after collection, and prior to analyses, were followed
according to Appendix A. Analyses were conducted by Duke Energy's Huntersville analytical
laboratory (NC Wastewater Certification #248). Methods of analysis and results for each parameter are
in Table 1.
Results /Recommendations
Most of the analytical results upstream and downstream of the ash basin discharge are at, or near, the
method defection limits and well, below water quality standards. Duke Energy proposes °that the in-
stream monitoring frequency be reduced from semi - annually to annually.

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Appendix A
Sample Preservation and Hold times

Parameter name
Containers
Preservatiort�a
Maximum
28. Hydrogen ion (pH)
P, FP, G
31, 43. K�eldahl and organic N
Table IB —Metal
1 in
(b ,,itileylB= ln`organi
P, FP, G
36. Mercury (CVAA) _
P, FP, G
1.,Acidity
P, FP, G
Cool, <_6 °C1'
Cool, F
14 days
14 da s
2. Alkalinity
P, FP G
4',Ammonia
P, FP, G
Cool, <_6 °Ct3, HISO4 to pH <2
Cool, <6 °C'
28 days
_48.;hours
9 ".,Biochemical,oxyaenndemand
PFP ° °; G I
HNO3 to pH <2
, 6 months
10 Boron
P, FP, orQuartz
I� 14. Biochemical
P
26 Fluoride
P
27. Hardness
P, FP, G
28. Hydrogen ion (pH)
P, FP, G
31, 43. K�eldahl and organic N
Table IB —Metal
P; FP, G
18 Chromium VI
P, FP, G
36. Mercury (CVAA) _
P, FP, G
36. Mercury (CVAFS)
FP, G
P, FP,
lined car
3, 6-8, 12, 13, 19, 20, 22, 26, 29, 30, 32 -34, 36, 37,
P, FP, G
46,47,61,62,68-60,62,63,70-72,74,76 Metals;
67. Sulfite
except boron, chromium VI, and_ mercury
,Cool 56 °C'B H2SO4 to pH <2
38 Nitrate
P, FP, EG
,39 Nitrate - nitrite
P, FP, G
40. Nitrite
P,mFF, G
41. Oil and grease
. G
90 days'
;BrCI
HNO3 to pH <2, or'at least 24
—*'-----'— offm_=j 42 Organic Carbon
P, FP; G
44 Orthophosphate
P, FP,,G
47. WmN
48. Pher
49,131
60. Pho�
63. ,Resn
67, .Residue, Volatile
28 tlays
P, FP,
9.6,111tsilicaM
P or G
64. Specific conductance
-48 hours
P, FP,
66 Sulfate
mss reducmg, age n4;if
P, FP,
66. Sulfide
P, FP,
2&days
6.months
HNQ3 or Hz.S_Q4 to pH <2
None,regwred,
Jim,
67. Sulfite
minutes
,Cool 56 °C'B H2SO4 to pH <2
P. FP.
68: Surfactants
Cool, <_6 °C'•° 481hours
LCAI'<_ °C'B,,HZSO4 to pH <2 r, 28 days
Non&required
28 tlays
None requited „�
An Iq e v
minutes
Cool, 56 °C'B
-48 hours
Cool, <_6 °C78, Ndc) to pH
14 tlays
mss reducmg, age n4;if
ox! izerpresent I'I
None,regwred
2&days
6.months
HNQ3 or Hz.S_Q4 to pH <2
None,regwred,
Analyze,v
minutes
,Cool 56 °C'B H2SO4 to pH <2
28 days
C001 6 °C7B pH = 9 3 -9 720
28 days
HNO3 to pH <2
28 "days
rmLYL 12N HCI or 5 mUL
90 days'
;BrCI
HNO3 to pH <2, or'at least 24
6,months
hours prior to analysis19
Im
minutes, Analyze
within 48 hours
Fix on site and store in dark
Cool, <6 °C16, H2SO4to pH
Cool, : :56 °Cte
Cool, <_6 °C'9, H2SO4 to pH
Cool, <_6 °C19
, 156 °C' °, add zinc acetate 17 days
sodium hydrozide,to pH >9
48
An
_48
"'P" is for polyethylene, "FP" is fluoropolymer (polytetrafluoroethylene,(PTFE), Teflon®)„ or other fluoropolymer, unless stated
otherwise in this Table II, "G" is glass, "PA" is any,plastic that is made of a,stenlizable material (polypropylene =or other autoclavable
plastic), "LDPE" is low density polyethylene
2Except where, noted in this Table II and the method for the parameter, preserve each grab sample within 15' minutes of
collection For a composite sample collected with an automated sample (&g , using a 24 -hour composite sample, see 40 CFR
122 21(g)(7)(i) or 40 CFR Part 403, Appendix E), refngerate the sample at <_6 °C during collection unless specified otherwise in this
Table 11 or in the method(s) For a composite sample to be split into separate aliquots1for preservation and/or analysis, maintain the

sample at :56 °C, unless specified, otherwise in this Table II or in the method(s), until collection, splitting, and preservation ,is
completed' Add the preservative,to the sample, container 'prior to sample collection when the preservative will not compromise the
integrity of a, grab sample, a composite sample, or aliquot split ,from a composite sample within 15 minutes of collection If a
composite measurement is require&but -a composite,sample would compromise sample integrity,, individual grab samples most be
collected at prescribed time intervals (e g, 4 samples over the course of a day, at 6- hour9ntervals), Grab samples must be analyzed
separately and the concentrations averaged Alternatively, grab samples may be collected in the field and composited in the
laboratory if the compositing procedure produces results equivalent to results produced: by, arithmetic averaging of'results of analysis
of individual grab samples For examples of laboratory compositmg procedures, see EPA Method 1664 Rev A (oil and grease) and
the procedures at 40 CFR 141 34(f)(14)(iv) and (v) (volatile organics)
3When any sample is to be shipped by common camer or sent via the U S Postal Service, it must comply with the
Department of Transportation Hazardous Materials Regulations (49 CFR part 172) The person offering such material for
transportation is responsible for ensuring such compliance For the preservation requirement- of'Table II, the Office of Hazardous
Matenals, Materials Transportation Bureau, Department of Transportation, has determined,that the Hazardous Materials, Regulations
do`not'apply to the following materials Hydrochloric acid (HCI);m water`solutions , at concentration&of10 +04% by'weight,or less (pH
about 1, 96 or greater, Nitric acid (HNO3) in water solutions a Cconcentrations of 0 15% by'weightaor less „(pH about 1 62tor greater),
Sulfuric acid (H2SO4) in water solutions at concentrations of 0 35% by weight or less (pH about 1 15' or greater), and Sodium
hydroxide (NaOH) in water solutions at concentrations of 0 080% by weight or less (pH about 12'30 or less)
4Samples should be analyzed as soon as possible'after collection The times listed are the maximum times that samples may
be held before the start of analysis and still be considered valid Samples may be held for longer penods only if the permittee or
monitoring laboratory has data on file to show that, for the specific types of samples under study, the analytes are stable for the
longer time, and has receive&a variance from the Regional, Admirnstrator under Sec 136 3(e) For a grab sample, the holding time
begins at,the time of collection For a composite sample collected with an automated sampler (e g , using a 24 -hour composite
sampler,,see,40 CFR 122 21(g)(7)(i) or,40 CFR part 403;,Appendix E), the holding time'begins,at,the time of the end of collection,of
the composite `sample For a set of grab samples composited do the feld or laboratory, the holding time begins at the time of
collection of the last grab samplerm,the set Some samples may' not be stable for the maximum time period given in the table A
permittee or monitoring laboratory is obligated to holdrthe, sample for a shorter time if it�knows that'a shorter time is necessary to
maintammsample stability See 136 3(e) for details The date and time of collection of an individual grab sample is the date and time
at which the sample is collected For a set of grab samples to be composited, and that are all collected on the same calendar date,
the date of collection is the date on which the samples are collected For a set of grab samples to be composited, and that are
collected across two calendar dates, the date of collection is the dates of the two days, e g, November 14 -15 For a composite
sample collected automatically on a given date, the date of collection is the date on,which the sample is collected For a composite
sample'collected automatically, and;that is,collected across two calendar dates, the date, of 'collection, is the,dates of the two days,
e.g , November14 -15 For static- renewal to)acity tests, each grab or composite'sample may also be used to prepare test solutions
for renewal at,24 h, 48,,h,,and /6r 72 h after',first use,jffstored at 0 -6 °C, with mirnmu6head space
5ASTM D7365 -09a specifies treatment options for samples containing oxidants (e g', chlorine) Also, 'Section 9060A of
Standard Methods for the Exarniration of,Water and Wastewater (20th and 21st editions) addresses dechlonnation procedures
6Samphng, preservation and mitigating interferences in water samples for analysis of'cyarnde are described in,ASTM D7365-
09a There may be interferences, that are not mitigated by the analytical test methods or D7365 -09a Any technique for removal or
suppression of interference may be employed, provided the laboratory demonstrates that it more accurately measures cyanide
through quality control measures described in the analytical test method Any removal or•suppression technique not described in
D7365- 09a,or the analytical'test,method must be documented along with supporting data
7For dissolved metals, filter grab samples within It minutes of collection and before adding preservatives For a composite
sample,collected with an automated sampler (e g , using a 24 -hour composite sampler, see 40 CFR 122 21(g)(7)(i) or 40 CFR Part
403, Appendix E), filter the sample�within 15 minutes after completion'of collection and before adding preservatives If it -is known or
suspected that dissolved sample integrity will be compromised during collection of'a'composite,sample,collected automatically, over
time (e'g , by interchange of a metal between dissolved and,' suspended forms), 'collect and filter grab samples,to �be,composited
(footnote 2) in place of a composite sample collected automatically
6Guidance applies to samples,to be analyzed by GC, LC, or GUMS for specific compounds
91f the sample,is -not adjusted to,pH'2, then the sample must be analyzed within seven days of sampling
10The pH adjustment is not required if acrolein will not be measured Samples for acrolein receiving no pH `adjustment must
be analyzed within 3 days of sampling
"When the extractable analytes of concern fall within a smgle� chemical category, the speafied preservative and maximum
holding times should be observed for optimum ' safeguard,of sample integrity (r e, use all necessary preservatives and hold for the
shortest,time listed) When the analytes of concern fall within two or more,chemrcal categories, the sample may be preserved by
cooling to <_6 °C, reducing residual chlorine with 0 008% sodium thiosulfate, stonng�rn the,dark, and adjusting the pH to 6 -9, samples
preserved,rn this�manner may, be,hel_d for seven,daysfbefore extraction and for forty days +after extraction ,ExceptionsJo this optional
preservation and' holding time procedure are noted in footnote ,5 (regarding the requirement for thiosulfate reduction), and' footnotes
12, 13 (regarding the analysis of`benzidrne)
1 If 1,2- diphenylhydrazme is likely to be present, adjust the pH of the sample to 4 0 ±0 2 to prevent rearrangement to
be_nzidine
13Extracts may be stored up to 30 days at <0 °C
14 For the analysis of diphenylrntrosamine, add 0 008% Na2S203 and adjust pH to 7 -10 with NaOH within 24 hours of
samplmP
1 The pH adjustment may be performed upon,receipt at the laboratory and may -be omitted if the samples,are extracted within
72 hours,of collection For the analysis,of aldrin, add 0 008% Na2S203
16PIace sufficent,ice with the samples in the�shippmg container to,ensure that ice is still present when the samples arrive at
the laboratory However, even if ice is, present when the,samples arrive, immediately measure the temperature of the samples and
confirm that,the preservationrtemperature maximum`has not been exceeded In the isolated cases where dtcan be documented that
this holding temperature, cannot be met, the permittee can be given the option of on -site testing or can request a variance The
request fora vanance,should include supportive data which show that the toxicity of the effluent samples is not reduced because,of

the increased „ holding, temperature Aqueous samples must not be frozen Hand - delivered samples,used on the day of collection do
not need to be cooled to 0 to 6 °C prior to test initiation
"Samples collected for4he determination of trace level mercury (2100 ng /L) using EPA Method 1631 must be collected in
tightly- capped fluoropolymer or glass bottles and preserved with,BrCI or HCI solution within 48 hours of sample collection The time
to preservation may be extended to 28 daysnf a sample,is oxidized in the sample,bottle A sample collected for dissolved trace level
mercury should be filtered in the laboratory within 24 hours of the time of'collection 'However, if circumstances preclude overnight
shipment „the sample should'be filtered in a designated clean area in the,field in accordance with procedures given'm Method 1669
If sample integrity will not be maintained by shipment to,and,filtraton, in the laboratory, the sample;must be filtered in a designated
clean area in the field within the time period necessary to maintain sample integrity A sample that has been collected for
determination of total or dissolved trace level'mercury must be'afialyzed within 90 days of,sample collection
"Aqueous samples,must be,preserved at: 156 °C, andsshould not be frozen unless data demonstrating that sample freezing
does noGadversely impact sample integrity is maintaine6on file,and accepted as valid by thei regulatory �authonty Also, for purposes
of NPDE&monitonng, the specification,of "5 °C” is usedXm,place,of the' "4. °C" and " <4 °C" sample,temperature requirements listed -in
some methods It is not necessary to measure the sample temperature to ,three significant figures (1 /100th of 1 degree), rather,
three, significant figures are specified so that rounding down to 6 'C 'may not ,be used to meet the 56 °C requirement The
preservation temperature does not apply to'sam pies, that are analyzed, immediately (lessRhan 15 minutes)
"An aqueous sample may be collected and shipped without acid preservation However, acid must be added at least 24,
hours before analysis to dissolve any metals,that adsorb to the container walls If the sample must be analyzed within 24 hours of
collection, add the acid immediately (see footnote 2) Sod and sediment samples do not need to be preserved with acid The
allowances in this footnote supersede the preservation and,holding time requirements in the approved metals methods
2OTo achieve the 28 -day holding time, use the ammonium sulfate buffer solution specified in EPA Method 218 6 The
allowance in this footnote supersedes' preservation, and holding time requirements in the approved hexavalent chromium methods,
unless this supersession would',compromise'the measu�ement,`in which case requirements in the method must be followed
211-Ioldmg time is calculated from time of sample collection to elution for samples shipped to the laboratory in bulk and
calculated from the time of sample filtration to elution for samples filtered,m the field
22Sample analysis should begin as soon as possible afterreceipt, sample, incubation must be started no later than 8 hours
from time of collection
23For fecal coliform samples for sewage sludge•(biosolids) only, the holding time is extended to 24 hours for the following
sample types using either EPA Method 1680 (LTB -EC) or, 1681 (A -1) Class A composted, Class B aerobically digested, and Class
B anaerobically digested
24 The immediate filtration requirement in orthophosphate measurement is to assess the dissolved or bio- available form of
orthophosphorus (i e, that which passes through a'0 45- micron filter), hence the requirement to filter the sample immediately upon
collection (i e, within 15 minutes of collection)
[38 FR 28758, Oct 16, 1973

April 2014 R.iverbend Seep Monitoring
Flow measurement devices were installed at seep sampling locations (Figure 1) to measure seepage
flows and to provide, sufficient depth to allow collection of water samples for laboratory analysis.
The flow measurement devices were constructed to impound the seepage in a channel and to direct the
,Collected flow into a PVC pipe for flow measurement. The -flow measurement devices were inspected
after installation and prior to sampling to, confirm sufficient flow and depth for sampling, and to verify
that only minimal leakage; if any, was present. Sufficient time was allowed' for,the impounded seepage
flows to reach equilibrium discharge flow before inspection
Descr'iptibns of flow and the seep sample locations are provided in Table 1.
Seep FloW Measurement Method
The seepage flows were measured using the timed- volumetric method.A volume of water was collected
from the,discharge of the PVC pipe into an appropriately sized container. Volumes (in mL) were
measured in'the field utilizing a graduated container., The amount o time ►n seconds needed to collect
the volume of water was recorded. A minimum of three
were calculated for each
volumes were recorded at each seep
volume. i ne av
icate
calculated flows (►n MGD) at a given seep location was utilized as the flow at the time of sample
collection (see Appendix A).
Seep Sample Collection Method
To minimize effects of stormwater runoff, and infiltration of rainwater into seep flows, seep samples
were collected during a period with minimal preceding rainfall. Samples were collected from the
discharge flow of-the flow measurement devices directly into sample bottles to avoid disturbing and
entraining any soil /sediment.
Analytical parameters requested for analysis were: TSS, TDS, Oil & Grease, Cl, SO4, F, COD, Al, As,
HIM.
e,
Pb, Sb, Se, TI, Zn,
preservation tecF-n`Rq_u_e_s_6f the samples after collection, and prior to ana yses, were followed according
to Appendix B. Analyses were conducted by Duke Energy's Huntersville analytical laboratory (NC
Wastewater Certification #248) and Pace Analytical Laboratories (NC Wastewater Certification # 12).
Methods of analysis for each parameter are in Table 2 and analytical results are presented in Appendix
A
Seep In -situ measurements
In -situ measurements (temperature, pH, and specific conductance) were measured utilizing Hach
Hydrolab DataSondes ® either at the discharge of the flow measurement devices, or in the impoundment
created by the device, if sufficient water depth did not exist,at the device discharge.
MtAsland Lake and Ash Basin (in- process) Sample Collection Method
Water samples and in -situ measurements from Mt. Island Lake were collected at a location upstream
(278.0) and downstream (277.5) -of the seeps. `(Figure 1). Additionally, water samples and in -situ
measurements were collected from an in- process ash basin location (Figure 1) The grab samples were

collected from the lake and basin's surface (0.3 m) directly into appropriate sample bottles. Preservation
and analyses methods for the lake samples are in Table 2 and Appendix B.
Recommendations
Earth and rock -fill dams are subject to seepage through the, embankment, foundation, and abutments.
Seepage control is necessary to prevent excessive uplift pressures, instability, of the downstream slope,
piping through the embankment and /or foundation, and erosion of material by migration into open joints
in the foundation and abutments.
The low volume of'water'characteristic of each seep location (including seeps where risible flow is non-
existent at times) coupled with the relatively low constituent concentrations in the samples, suggest that
there is little potential to influence water quality in Mountain Island Lake. If reasonable potential
analyses demonstrate that there .is no potential to exceed water quality standards, then Duke Energy
proposes to re- evaluate the RBSS seep locations listed in this document annually'over the next 5 -year
permit cycle. These annual evaluations would be ducumented and would verify the condition of the
existing seeps and determine the presence of new seeps. DWR will be promptly notified if any new
seeps are identified or any significant changes are observed for the existing seeps. If any existing or
newly identified seeps are determined to reach Mountain Island Lake and demonstrate reasonable
potential to exceed a water quality standard, Duke Energy will do one of the following. 1) stop the seep,
2) capture and route the seep so that it is discharged through.a NPDES permitted outfall or 3) address
the seep using Best Management Plans approved by DWR.

Table 1 - Riverbend Steam Station Ash Bastin— Seep Locations and Descriptions
Location Coordinates
Flow
Latitude
Longitude
Seep ID
Description
Description
Located west of the Primary Cell and north of the Cinder Storage Area Seepage at
S -1
35 365
-80967
Continuous
multiple locations near the toe of the Primary Cell and Cinder Storage Area dikes
and collect in the general area of S -1
S -2
35 365
-80966
Continuous
Located west of the Primary Cell dike at the end of rip- rap`lined channel, near the
toe of the Primary Cell dike
S -3
35 369
-80965
Continuous
Located west of the Secondary Cell in a drainage feature downgradtent from,the toe
of the'Secondary Cell dike Seepage is upgradient of the S -3 device
S -4
35 371
-80963
Continuous
Located north ofthe Second#y,Cell downgradient of the toe of the northern
Secondary Cell abutment
S -5
35 370
-80963
Continuous
Located north of the Secondary Cell along the toe slope of the northern Secondary
Cell abutment Seepage flows from multiple locations upgradient of the S -5 device
S -6
35 367
-80958
Continuous
Located east and downgradient of,the ash basin, flowing in the general direction of
groundwater flow from the ash'basin
Located east and downgradient of the ash basin, flowing in the general direction of
S -7
35 367
-80957
Continuous
groundwater flow from the ash basin
S -8
35 365
-80956
Continuous
Located -east of the ash basin and Secondary Cell,dtke
S -9
35 371
-80963
Continuous
Located north ofthe,Secondary Cell - northern abutment at,the end ofnp -rap fined
channel, near the toe of the abutment
Located east of the Secondary Cell dike downstream of a rip -rap lined channel at
S -10
35 369
-80960
Intermittent
the toe of the dike

Notes
1 Flow description for each seep sample location is based on multiple site visits performed by HDR Engineering, Inc (HDR) from
November 2013 until April 2014
2 S =10 did not exhibit-flow at the time of seep sampling
3 Flow measurements and analytical samples were collected (except for S -10), on April 29, 2014
4 'Location coordinates for'seepisampling locations were recorded by HDR using a handheld Trimble GPS unit,and are approximate
Location Coordinates
Flow
Latitude
Longitude
Seep ID
Description
Description
Located cast ofthe Secondary Cell dike Fdownstream. of a rip -rap lined,channel at
S -11
35 369
-80960
Continuous
the toe of the dike
Located at the end of a concrete channel downstream of the toe of the Secondary
S -12
35 368
-80959
Continuous
Cell dike
Notes
1 Flow description for each seep sample location is based on multiple site visits performed by HDR Engineering, Inc (HDR) from
November 2013 until April 2014
2 S =10 did not exhibit-flow at the time of seep sampling
3 Flow measurements and analytical samples were collected (except for S -10), on April 29, 2014
4 'Location coordinates for'seepisampling locations were recorded by HDR using a handheld Trimble GPS unit,and are approximate

Table 2 — Analytical Methods
Parameter
Method
Reporting
Limit
Units
Lab
COD �_,HACH8000�
tix
20
- �Af&''
W mg/L•
ffi -5' "vtYTaah va,�c°fk =aQ'
Duke Energy
'
Chloride
EPA 300 0,
1
mg /L
Duke Energy
F,lubrid'eEFA�;
Sulfate
30,010 =
EPA 300 0
:v 1
1
mg/Lb_DukeEnergy��
mg /L
Duke Energy
WM 0!Ifand Grease ,,
Mercury (Hg)
Aluminum (AI) �
Barium (Ba)
nEPA 16646
EPA 245 1
EP 7 t
EPA 200`7
��
005
- 005
0 005
U� /L•rw�t eP,ace
ug /L
N •— -- meLL
mg /L
Analtyical ,u
Duke Energy
Duke,E ergy'� .'
Duke Energy
Boron (B)°
Calcium (Ca)
EPA200�7
EPA 200 7R
0 05�i
001
ISMIN � ° "'!' M
mg /L
__ yDukEnergY << ,
Duke Energy
Iron (Fe)
EPA 200'7
0`01
mg /L
'Duke Energy
r Magnesi m (Mg) r
SPrt — �.- ... -R:- �
Manganese (Mn)
EPA 200 7
0 005
mg /L
Duke Energy
Yd ,Zane (Zri)
'EPAf2007�s
� °u.:Pse�,a.s'v. =.s- ,.:.,,
e.'u2._ 0 005��
41 a..
E im�?p�keEnergr
4 .kt -' �S
�'« J. - -.t,
Antimony (Sb)
EPA 200 8
ug /L
Duke Energy
'erse ^icAs�
_�; ,_ .� • , t
:EPQ200 8�
1_
u,1
--
_ U L._
- - g�
uke.En'ergyn_ ;
Cadmium (Cd)
EPA 200 8
ug /L
Duke Energy
' ,,[Firomwm (Cr)e
0
. _ ._� ..
EPA 200 8
-
Fa v-. _ri . -.caY l
1
' rue /L _'Y'd
"Duk EnermgyX
-
Copper (Cu)
mg /L
Duke Energy
a Lead (Pb)�- �,,;
'Molybdenum (MO)
aEPA'�200 ^8•' �9S
EPA 200 8
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1
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Appendix A
Seep Flows and Analytical Results

Appendix B
Sample Preservation and Hold times

Parameter name Containers Preservation23 Maximum holding
time'
�TableLi6= lnorgariic�Tests: _ - �,"'� =�••=° ��� �. � ���?' � �--m -` a
1 Aciditv P- FP. G Cool- 56 ie 14 days
FP. or Quartz I HN
14. Bioc� hemiicca�l,'o�xygen.demanii, carborihceous P, FP G Cool, s6 °C'° 48 hours
15Chemlcalmoxvaendemand rP__ PsCo; HzSOe to�pH <_2; 28;days
16 Chloride I P. FP.. G None reowred 28 days
21 ,Color
P, FP, G
Cool, 56 °C'°
48 hours
23 24: Cyanlde,mtotal or avallable;(or CATC) and�f�ee
F FR G
18105
°I�,�CaO�to,
48 hours
,�
jqe,
,
�,- reducg agentoxidize
-t 3
P; FP, G
Cool, s6 °C1e
present ._ O_E t
�
25 Fluoride
P
None required
28 days
27 Hardness
Pr FP' G` i�
tiHNO3zor H2SOa:tolpH <2 t
,+6 m no tO-
28 Hydrogen ion (pH)
P, FP, G
None required
Analyze within 15
FP; GCoo'e
P, FP, G
Cool, 56' °C'B, add zinc acetate
plus sodium hydroxid6to pH >9
X28 tl ys�
7 days
minutes
31, 43?Kjeldah4andaorganicN -. _,P
FP °-
Gool�";=5 CH2$O_, to,pH <2 t2.
S;days r
Table'iB- Metals.'
Analyze
48 hours
18KC_hro`mlumvVl z'
FPS P, -G
_ C of C:_W,C......pH} _93.9 {7°�°
_28bdays �,+ Y
35 Mercury (CVAA)
P, FP, G
HNO340 pH <2
28 days
p35. <Me�rcury (CVAFS) - ; °; _ -
- r
4Gs amend Fl?-
t nYsrY�
w5 mUL�12N HCKor 5`mU,L-.B'eG "
v
90x 9 "
Imed caps
a _
3, 5 -8, 12, 13, 19, 20, 22, 26, 29, 30, 32 -34, 36, 37, 45,
P, FP, G
HNO3,to pH <2, or' at least 24
6�months
47, 51, 52, 58 -60, 62, 63, 70 -72, 74, 75. Metals, except
hours prnor'to analysis19
boron, chromium'VI,,and mercury
48 hours '
38.+Nltrate -° r '
P, FP, G
'Cool> s6?
39 Nitrate - nitrite
P, FP, G
Cool, :56 °C'", H2SO4 to, H <2
28 days
40. Nitrite =, €r a
P, FP, G,
Cool 6 '@
X48 oh urs 4,r E ., 1
41 Oil and grease
G
Cool;to 56, °C18, HCI oriH2SO4 to'
28 days
&42. Ofj, flI&CAW6 Ow
Pte„ FP,- 1 , e
Cool) 0 56�,C 4HC- l%H2SO4, or° `
28�days - =
l
Cool, to s6 °C1e 24
Filter within 15 minutes,
44 Orthophosphate
P, FP, G
Analyze within 48
hours
47 Winkler
G, Bottle,and top
Fix on site and store in dark
8 hours
48. Phenols -
49. Phosphorous (elemental)
raG�.._._,
G
Cool,56 °C15
48 hours
50. Phosphorous; total = _= - -
53 Residue, total
11? .. IGG %i :'
Cool,, s6 C, ,sH SO4�to PH <2,
.r28.,days'
7 days
P; FP, G
Cool, s6 °C1e
54.,Residue, F „Ilterable. = _ <„ . __. +_ .�e
55 Residue, Nonfdterable (TSS)
IR ER; G -`
10561R 64C ._ T-ma �
7 ayc a
P, FP, G
Cool, s6 C18
7 days
56.,Residuez$ettleabla {�'�„P_,!
57. Residue, Volatile
6.1..SIIica �� :m --
164
FP G'r z �
P, FP, G
Cool�ss6� °C' -j',
Cool, s6 °C1e
Goo1,.5. ..__.kr
Cool, <_6 °C'"
7 days
vsw.ry.
8 a"
28 days
Specific conductan
conductance
P FP, G
!65f Sulfate, yP
66 Sulfide
FP; GCoo'e
P, FP, G
Cool, 56' °C'B, add zinc acetate
plus sodium hydroxid6to pH >9
X28 tl ys�
7 days
6T.,Sulfitet
11 MAIM
68 Surfactants _
°69._Temperature ..° <�' -P
73. Turbidi "
P 1FP;
P,FP, G
iFP1;Gfi
P, FP, G
None req d ` ; , ��[ t
Cool, 56-°C18
.4rialyie within15"
48 hours
M:None;requ�red
Cool, s6'C s
Analyze
48 hours
' "P" is for polyethylene, "FP" is fluoropolymer (polytetrafluoroethylene (PTFE), Teflon®), or other fluoropolymer, unless stated otherwise
in this Table II, "G" is,glass, "PA" is any plastic °that is made of,a sterilizable, material (polypropylene, or other autoclavable plastic), "LDPE" is
low density polyethylene
2Except where noted in this Table II and the)method for the'parameter, preserve each grab sample within 15 minutes of collection For a
composite, sample collected with an automated sample (e g , using a 24 -hour composite sample, se&40 CFR 122 21(g)(7)(i) or 40 CFR Part
403, Appendix E), refrigerate the sample at :56 °C during collection unless specified otherwise in this Table II or in the method(s) For a
composite sample to be split into separate aliquots for preservation and /or analysis, maintain the sample at s6 °C, unless specified otherwise
in this Table II or in the method(s), until collection, splitting, and preservation is completed Add the preservative to the sample container prior
to sample collection when the preservative will not compromise the integrity of a grab sample, a composite sample, or aliquot split from a

composite sample within 15 minutes of collection If a composite measurement is,required,but a composite,sample would compromise sample
integrity, individual grab,samples rrust,be collected' at prescribed time intervals (eig , 4 samples over the course of a day, ab6 -hour intervals)
Grab samples must be analyzed separately, and the, concentrations averaged Alternatively, grab samples may be collected in the field and
compositedan the laboratory if the compositing,procedure produces results equivalent to results produced by arithmetic averaging of,results,of
analysis of individual grab samples For examples of laboratory compositmg procedures,'see EPA Method 1664 Rev A,(od and grease) and
the procedures at 40 CFR 141 34(f)(14)(iv) and (v), (volatile organics)
'When any sample is to be shipped by common carrier or sent via the U S Postal Service, it must comply with the Department of
Transportation Hazardous Materials Regulations (49 CFR part 172) The person offering such material for transportation is responsible for
ensuring such compliance For the preservation requirement of Table II, the Office of Hazardous Materials, Materials Transportation Bureau,
Department of Transportation has determined that the Hazardous Materials Regulations do not apply to the following materials Hydrochloric
acid (HCI) m,water solutions at concentrations of 0 04% by weight,or less (pH about 1 96 or greater, Nitric acid (HNO3) in water solutions at
concentrations of 0 15% by weight or less (pH about 1 62 or greater), Sulfuric acid (H2SO4) in water solutions at concentrations of 0 35% by
weight or less (pH about 1 15 or greater), and Sodium hydroxide (NaOH) in water solutions at concentrations of 0 080% by weight or less (pH
about 12 30 or less)
4Samples should be analyzed as soon as possible after collection The times listed are the maximum times that samples may be held
before the start of analysis and still be considered valid Samples may be held for longer periods only if'the permittee or monitoring laboratory
has data on file to show that, for the specific types of samples under study, the analytes are stable for-the longer time, and has, received a
variance from the Regional Administrator under Sec 136 3(e) For a grab sample, the holding time begins at the time of collection For a
composite sample collected Huth an automated sampler (e g , using a 24 -hour composite sampler; see 40 CFR 122 21(g)(7)(i) or 40 CFR part
403, Appendix E), the holding time begins at the time of the end of collection of the,composite sample Fora set of grab samples composded
in the field or laboratory, the holding timeibegms at the time of collection of the last grab samplelin the set Some samples may not be stable
for the maximum time period given in the table, A permittee or monitoring laboratory'is obligated to hold the sample for a shorter time if 'd
knows that,a shorter time is necessary to maintain sampleastabdity See 136 3(e) forrdetads -The date and time of collection of an individual
grab sample is'the,date,and time at which thersample is collected For a,set of grab samples to be composded, and that are all collected on
the-same calendar date, the date,of collection is,thedate on which4he samples are collected For a set,of grab samples to be composded, and
that are collected across two calendar dates', the date of collection is the dates of the two days, �e g , November 14 -15 For a composite
,sample collected automatically on a,givemdate, the date of collection is the date on which the sample is collected For a composite, sample
collected automatically, and that is collected across two calendar'dates, the date of,collection is,the,dates of the'two days, e g , November 14-
15 For static- renewal toxicity tests, each grab or composite sample may also be used to prepare °test solutions for renewal at 24 h, 48 h,
and /or 72 h after first use, if stored at 0 -6 'G with minimum head space
5ASTM D7365 -09a specifies treatment options for samples containing oxidants (e g , chlorine) Also, Section 9060A of Standard
Methods for the Examination of Water and Wastewater (20th and 21st editions) addresses dechlonnation procedures
6Sampling, preservation and mitigating interferences in water samples for analysis of cyanide are described in ASTM D7365 -09a There
may be interferences that are not' mitigated by the analytical test methods or D7365 -09a Any technique for removal or suppression of
interference may be employed, provided the laboratory demonstrates that it more accurately measures cyanide through quality control
measures described in the analytical test method Any removal or suppression technique not described in D7365 -09a or the analytical test
method must be documented along with supporting data
7For dissolved metals, filter grab samples within 15 minutes of collection and before adding preservatives For a composite sample
collected with an automated sampler (e g , using a 24 -hour composite sampler, see 40 CFR 122 21(g)(7)(i) or 40 CFR Part 403, Appendix E),
filter the sample within 15 minutes after completion of collection and before adding preservatives 10t is known or, suspected that dissolved
sample integrity will be compromised during collectiomof a composite sample collected automatically over time (e g , by interchange of a metal
between dissolved and suspended forms), collect and filter grab samples to be composited (footnote 2) in place of a composite sample
collected automatically
6Gudance applies to samples to be� analyzed by GC, LC, or GUMS for specific compounds
IIf the sample is not adjusted to pH'2, then the sample must,be analyzed within seven days of,sampling
10The pH� adjustment is not required if acrolem will not be measured Samples for acrolein receiving no,pH adjustment must be,analyzed
within 3 days of sampling
1 When the extractable analytes of concern fall within a single chemical category, the specified preservative and maximum holding
times should be,observed for optimum�safeguard,of sample integrity (r,e , use all necessary preservatives and hold for the shortest time listed)
When the,analytes of concern fall within two or more chemical categories, the sample may be'preserved.by cooling to 56 °C, reducing residual
chlorine with 0'008% sodium thiosulfate, storing in the dark, and adjusting the pH to,6 -9, samples preserved in this manner may be held for
seven days before extraction and for forty days-after extraction Exceptions to this optional preservation and holding time procedure are noted
in footnote 5,(regardmg the requirement for thiosulfate'reduction) „and footnotes 12, 13 (regarding the analysis of benzidine)
121f 1,2- diphenylhydrazme is likely to be present, adjust the pH of the sample,to 4 0 t0 2 to prevent rearrangement to benzidme
13 Extracts may be stored up to 30 days at <0 °C
14 For the analysis of diphenylnitrosamme, add 0 008 %,Iga2S203 and adjust pH to 7 -10 with NaOH within 24 hours of sampling
15 The pH adjustment may be performed upon-receipt at the laboratory and may be omitted if the samples are extracted within 72 hours
of collection Forthe analysis of aldrin, add 0 008% Na2S203
16 Place sufficient ice with the samples in the shipping container to ensure that ice is still present when the samples arrive at the
laboratory However, even if ice is present when the samples arrive, immediately measure the temperature of the samples and confirm that
the preservation temperature maximum has not been exceeded In the isolated cases where it can be documented that this holding
temperature cannot be met, the permittee can be given the option of on -site testing or can request a variance The request for a variance
should include supportive data which show that the toxicity of the effluent samples is not reduced because of the increased holding
temperature Aqueous samples must not'be frozen Hand - delivered samples used on the day of collection do not need to be cooled to 0 to 6
°C prior to test initiation
"Samples collected for the determination of trace'level mercury ( <100 ng /L) using EPA Method 1631 must be collected in tightly -
capped fluoropolymer or glass bottles and preserved yrth BrC1 or HCI solution within 48 hours,of sample collection- The time to preservation
may be extended to 28 days if a sample is oxidized, in the sample ,bottle A sample collected for dissolved trace level mercury should be
filtered in the laboratory within 24 hours of the "time,ofcollection However, if'circumstances preclude overnight shipment, the sample should
be filtered In a designated clean area in the field in accordance with procedures given in Method 1669 If sample integrity will not be
maintained by shipment to and filtration in -the laboratory, the sample must be filtered in a designated clean area in the field within the time

period necessary to maintain sample integrity ,A sample that has been collected for determination of total or dissolved trace level mercury
must be analyzed within 90 days of sample collection
"Aqueous samples must be preserved at 56 °C, and should not be frozen unless data demonstrating that sample freezing does not
adversely impact sample integrity is maintained on file and accepted as valid by the- regulatory authority Also, for purposes of NPDES
monitoring, the specification of "5 °C" is used in place of the "4 °C" and " <4 °C" sample temperature requirements listed in some methods It is
not necessary to measure the sample temperature to three significant figures (1/100th of 1 degree), rather, three significant figures are
specified so that rounding down to 6 °C may not be used to meet the, :56 °C- requirement' The preservation temperature does not apply to
samples that are analyzed immediately (less than 15 minutes)
"An aqueous sample may be collected and shipped without, acid preservation However, acid must be added at least 24 hours before
analysis to dissolve any metals that adsorb to the container walls If,the sample must be analyzed within 24 hours of collection, add the acid
immediately,(see footnote 2) Sod and sediment samples do not need to be, preserved 'with acid The,allowances,in this footnote supersede the
preservation and holding time requirements, in the,approved metals methods
20To achieve the 28- day: holding, time, use the?ammonwm,sulfate buffer, solution, specified in EPA Method -218,6 The allowance,in this
footnote supersedes preservation and holding time requirements m the approved hexavalent chromium methods, unless this supersession
would compromise the measurement, in which case.requirements in the method must be'followed
2tHolding °time is calculated from time of sample, collection to elution °fonsamples shipped to the laboratory in bulk and calculated from
the time of sample filtration to elution for,samples filtered"in'the field
22 Sam ple,analysis`should , beg m,as soon as possible after'receipt, sample incubation must be,started no later than 8 hours from time of
collection
23 For fecal coliform samples for sewage sludge (biosolids) only, the holding time is extended to 24 hours,for the following sample types
using either EPA Method' 1680' (LTB -EC) or 1681 (A -,1) ; Class,A composted, Class'B aerobically digested, and Class B anaerobically digested
24 The immediate filtration requirement in orthophosphate measurement is to assess the dissolved or bio- available form of
orthophosphorus (i e , ,that'which passes through a,0 45- micron filter), hence the requirement to filter the sample immediately upon collection
(re, within 15 minutes of collection)
[38 FR 28758, Oct 16, 1973