NC0004987_National Pollutant Discharge Elimination_20100607

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Collen H. Sullins
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
REGION 4
ATLANTA FEDERAL CENTER
61 FORSYTH STREET
ATLANTA, GEORGIA 30303-8960
rJA 0 3 2010
Director, Division of Water Quality
North Carolina Department of Envirc
Natural Resources
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Dear Ms. Sullins:
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OFFICE
EPA, Region 4 is in receipt of the draft National Pollutant Discharge Elimination System
(NPDES) permit for the Marshall Power Plant. The permit application information did not
include a Form 2C for outfalls 002A and 002B — yard sump overflows. Both outfalls have an
intermittent discharge to waters of the US, and information regarding the effluent characteristics
of these outfalls is required by 40 Code of Federal Regulations (C.F.R.) § 122.21(a) — Duty to
apply. Because the information provided is inadequate to determine whether the draft permit
meets the guidelines and requirements of the Clean Water Act (CWA), 1•request that a complete
permit application for this facility be submitted that meets the requirements of 40 C.F.R.
§ 122.21(a). Pursuant to federal regulatory requirements and language of Section VII.A. of the
North Caroliria-EPA National Pollutant Discharge Elimination System Memorandum of
Agreement (MOA), this letter constitutes an interim objection to the issuance of this permit. In
accordance with the MOA and federal regulations, the full period of time for review of this draft
permit will recommence when the requested information is received by this Office.
Additionally, we have completed our review of the facility's CWA Section 316(a) Report
entitled, Assessment of Balanced and Indigenous Populations in Lake Norman near Marshall
Steam Station, (dated October 2009) which was received via e-mail on May 13, 2010. Our
comments on this report are outlined below.
Section 316(a) Report and the Study Plan for the Subsequent Permit
The report lacks detail and did not generate information sufficient to support a Section
316(a) variance determination for the next permit cycle. The Environmental Protection
Agency's (EPA) comments are submitted in order to ensure that the study plan to be developed
during the next permit cycle will generate information sufficient to support a determination of
whether the power plant's thermal variance under Section 316(a) of the CWA can be approved.
EPA recognizes that, under 40 C.F.R. § 125.73(c), existing sources seeking variance
renewal are not typically required to conduct the same detailed, comprehensive studies required
Intemet Address (URL) • http://www.epa.gov
Recycled/Recyclable -Printed with Vegetable Oil Based Inks on Recycled Paper (Minimum 30% Postconsumer)

under §§ 125.72(a) and (b). Also, under § 125.73, existing sources can base their demonstration
on a lack of appreciable harm instead of completing predictive studies. However, under §
125.72(c), the type of .detailed studies contemplated under §§ 125.72(a) and (b) can be required
whenever determined to be necessary. After examining the record of prior 316(a) variance
determinations for the Marshall Station, EPA has concerns regarding the need for a more
thorough examination and definition of the Balanced and Indigenous Population (BEP), the
identification of Representative Important Species (RISs), and a closer examination of whether
the variance is protective. Given the thinness of the available record for prior variance
determinations; EPA believes a more focused study is needed. EPA acknowledges that Duke
Energy has in the past collected a substantial amount of data in support of its variance. Duke
Energy may use existing data in completing its study and may incorporate the existence of such
data into the monitoring program plan design; however, the existing data needs to be evaluated
and presented in the context of a BIP definition that the existing record does not adequately
provide.
Section 316(a) of the CWA contains the term "BIP" but does not define it. However, 40
C.F.R. § 125.71(c) defines the term "balanced, indigenous community".' as:
"A biotic community typically characterized by diversity, the capacity to sustain itself
through cyclic seasonal changes, presence of necessary food chain species and by a lack
of domination by pollution tolerant species. Such a community may include historically
non-native species introduced in connection with a program of wildlife management and
species whose presence or abundance results from substantial, irreversible environmental
modifications. Normally, however, such a community will not include species whose
presence is attributable to the introduction of pollutants that will be eliminated by
compliance by all sources with section 301(b)(2) of the Act: and may not include species
whose presence or abundance_ is attributable to -alternative effluent limitations imposed
pursuant to section 316(a)."
The Environmental Appeals Board stated in its. decision in In Re'Dominion Energy
Brayton Point, LLC, 12 Environmental. Appeals Decision (E.A.D.) 490 (2006)("Brayton Point"),
"this definition clearly envisions a consideration of more than the population of organisms
currently inhabiting the water body. In this vein, although it permits inclusion of certain
`historically non-native species' that are currently present, it explicitly excludes certain currently
present species whose presence or abundance is attributable to avoidable pollution or previously -
granted section 316(a) variances." -
Page 557 of the Brayton Point E.A.D. goes on to further state that a BIP "can be the
indigenous population that existed prior to the impacts of pollutants, not solely the current
populations of organisms."
To the question of how a permittee should identify a BIP in an area that has been altered _
by impacts from an existing, thermal discharge, the Brayton Point E.A.D. points out that it may
' "Balanced, indigenous community" and BIP are equivalent terms.
2'

be appropriate to use a nearby water body unaffected by the existing thermal discharge as a
reference area. Examination of an appropriate reference area may be applicable in this case.
The definition of "balanced, indigenous community" at 40 C.F.R. § 125.71(c) contains
several key elements. To be consistent, with the regulations, each of these key elements should
be specifically addressed in the demonstration, and the facility's CWA Section 316a Monitoring
Plan should,be designed to generate information relevant to these elements. Those elements
include: (1) "a population typically characterized'by diversity at all tropic levels;" (2) "the
capacity to sustain itself through cyclic seasonal changes;" �(3)""presence of necessary food chain
species;" (4) "non -domination of pollution -tolerant species;" and (5) "indigenous." Each of
these elements is discussed in more detail below: -.
1. "A population typically characterized by diversity at all tropic levels" means that all of the
major tropic levels present in the unaffected portion of the water body should be present in the
heat affected portions. EPA recognizes that community structure differences will occur,
however, the number of species represented in each tropic level in the unaffected portions should
be reasonably similar in the heat affected portions of the water body. Sampling and analysis of
fish and invertebrate communities should be done such that the major tropic levels are identified
and represented by reasonably similar species distributions. Also, the study plan should be
expanded to include some observations of wildlife (i.e., water fowl, mammals, amphibians, etc.)
both upstream and immediately downstream of the discharge point that may be impacted by the
thermal discharge.
2. "The capacity to sustain itself through cyclic seasonal changes °' means that any additional
thermal stress will not cause significant community instability during times of natural extremes
in environmental conditions. Community data should be collected during normal seasonal
extremes as well as during optimal seasonal conditions. Data should be compared between heat
affected and unaffected portions of the receiving water body to account for normal community
changes corresponding with a change in season.
3. "Presence of necessary food chain species" means that the necessary food webs remain intact
so that communities will be sustaining. We believe that exhaustive food web studies are not
necessary provided that invertebrate, fish and wildlife communities are otherwise healthy, i.e.,
represented by sufficiently high species diversity and abundance (appropriate for that portion of
the receiving water body) for the identified tropic levels and sustaining through normal seasonal
changes. ` 0
4. "Non -domination of pollution -tolerant species" means, that in the case of a thermal effluent,
community assemblages in heat affected portions of the lake dominated by heat tolerant species
do not constitute a BIP. EPA.recognizes that because all species have varying levels of thermal
tolerance, communities in the heat affected portions of the water body may possess altered
assemblages in terms of species present and abundance. All community data should be
collected, analyzed and presented to clearly demonstrate that affected communities have not
shifted to primarily heat tolerant assemblages.

5. "Indi eg nous" has been further clarified iri the regulations: "Such a community may include
historically non-native species introduced in connection with a program of wildlife management
and species whose presence or abundance results from substantial, irreversible environmental
modifications. Normally, however, such a community will not include species whose presence is
attributable to the introduction of pollutants that. will be eliminated by compliance by all sources
with section 301(b)(2) of the Act: and may not include species whose presence or abundance is
attributable to alternative effluent limitations imposed pursuant to section 316(a)." EPA
recognizes that non -indigenous species are present in most aquatic systems in the United5tates..
All -community data should be analyzed and presented to demonstrate that community
assemblages in the heat affected portions of the receiving water body are not significantly
different from non -affected communities with regard. to the number of non -indigenous species in
the assemblages.
In addition to the foregoing components of the BIP definition, the study plan should- also
include provisions for the identification of RIS (e.g., a list of threatened, endangered, thermally
sensitive, or commercially or recreationally valuable species in up- and down -stream of the study
area), as contemplated in 40 C.F.R. § 125.72(b). 40 C.F.R. § 125.71(b) defines RIS as "species
which are representative, in terms of their biological needs, of a balanced, indigenous community
of shellfish, fish and wildlife in the body of water into which a discharge of heat is made."
The following EPA comments should be specifically addressed in the study plan prior to
Duke Energy commencing sampling during the term of the next NPDES permit. The plan
should:
a) include available information on wildlife in the receiving water body areas based on
communications with North Carolina's Wildlife Management Agency. See
item 1 above.
b) include a diagram depicting the thermal plume under the worst case scenario
and address the presence or absence of a zone of passage for which fish can
travel around the thermal plume.
e) provide information of which fish collected are either heat -sensitive or
nuisance species. See item 4 above.
d) provide a list of any lake species that are endangered or threatened in accordance with
federal and state regulations.
e) analyze and present data to clearly demonstrate that affected communities
have not shifted to primarily heat tolerant assemblages,
f) include recent data or information on benthic macroinvertebrates. See item 1 above.
g) analyze and present all data to demonstrate that community assemblages in the heat
affected portions of the receiving water body are not significantly different from non -
4

affected communities with regard tothe number of non -indigenous species in the
assemblages -
To reiterate, in order to ensure that Duke Energy's future study plan for the receiving
water body is adequate to demonstrate that the power plant should get continuance of a Section
316(a) variance during the term of its next NPDES permit, EPA requests the opportunity to
review a draft 316(a) plan prior to Duke Energy commencing the study.
Lastly, Plant Marshall has an ash -pond, and a flue gas desulfurization (FGD) system. Due
to the ash spill that occurred at the TVA Kingston; EPA's Office of Water recommends NPDES
permits for power plants with coal combustion waste impoundments (i.e., ash ponds) include
language regarding structural integrity inspections. This language agrees with the requirements
of 40 C.F.R. § 122.41(e), which addresses proper operation and maintenance of wastewater
treatment facilities. See the enclosed model language addressing coal combustion waste ,
impoundments, which should be incorporated into the draft permit.: Also, for those power plants
with either a proposed or an existing FGD system, the NPDES permit writing authority must
complete a Best Professional Judgment (BPJ) Best Available Technology (BAT) analysis to
demonstrate that the permittee has installed the best available treatment technology to reduce the
discharge of toxic pollutants which are not currently addressed in the applicable effluent
guideline for the FGD wastewater stream.
If you have any questions, please call me or have your staff contact Ms. Karrie-Jo Shell at
[phone].
Sincerely,
Q
Water Protection Division
Enclosure
cc: Mr. Allen Stowe
Duke Energy
41-:1

Model Permit Language
A. Impoundment Design, Construction, Operation, and Maintenance
(1) All impoundments used to hold or treat wastewater and other associated wastes shall be
designed, constructed, operated, and maintained to prevent the discharge of pollutants to
waters of the United States, except as authorized under this permit.
(2) Design, construction, operation, and maintenance of any impoundment shall be in
accordance with all relevant State and Federal regulations and shall be certified by a
qualified, State -registered professional engineer and permitted and inspected by the
appropriate agency prior to use. When practicable, piezometers or other instrumentation
shall be installed as a means to aid monitoring of impoundment integrity.
B. Impoundment Integrity Inspections
(1) All impoundments shall be inspected at least monthly by qualified personnel with .
knowledge and training in impoundment integrity. The term qualified personnel means
personnel having successfully completed the Mine Safety and Health Administration
Qualification for Impoundment Inspection course in addition to the Annual Retraining for
Impoundment Qualification, or equivalent courses. In addition, impoundments shall be
inspected annually by a qualified, State -registered professional engineer. Additional
inspections by qualified personnel shall be done within 7 days after large or extended rain
events (i.e., 10 -year, 24 hour precipitation event).
(2) Inspections shall, at a minimum, include observations of dams, dikes and toe areas for
erosion, cracks or bulges, seepage, wet or soft soil, changes in geometry, the depth and
elevation of the impounded water, sediment or slurry, freeboard, changes in vegetation
such as overly lush, dead or unnaturally tilted vegetation, and any other changes which may
indicate a potential compromise to impoundment integrity. The findings of each inspection
shall be documented in a written inspection report.
(3) Remediation Meastcres. Within 24 hours of discovering changes that indicate a potential
compromise to the structural integrity of the impoundment, the permittee shall begin
procedures to remediate the problem. Changes such as significant increases in seepage or
seepage carrying sediment may be signs of imminent impoundment failure and'should be
addressed immediately.
Other issues which may have long term impacts on integrity, such as trees growing on the
impoundment or vegetation blocking spillways, shall be cleared within thirty days of first
observation.
C. Reporting and Recordkeeping Requirements for Impoundments
(1) Within 5 days of discovering any changes in the impoundment that indicate a potential
compromise to the structural integrity, the permittee must notify the NPDES Permitting

Authority in writing describing the findings of the inspection, corrective measures taken,
and expected outcomes. Failure to do so will be a violation of this permit.
(2) The permittee shall submit an annual report to the NPDES Permitting Authority
summarizing findings of all monitoring activities, inspections, and remediation measures
pertaining to the structural integrity, design, construction, and operation and maintenance
of all impoundments.
(3) The permittee shall maintain records of all impoundment inspection and maintenance
activities, including corrective actions made in response to inspections and all other
activities undertaken to repair or maintain the impoundment. All records shall be kept on
site and made available to State or Federal inspectors upon request.
(4) All pertinent impoundment permits, design, construction, operation, and maintenance
information, including but not limited to: plans, geotechnical and structural integrity
studies, copies of permits, associated certifications by qualified, State -registered
professional engineer, and regulatory approvals, shall be kept on site and made available to
State or Federal inspectors upon request.
D. Permit Re -opener Requirement
The Director may re -open this permit to incorporate more stringent requirements or any
applicable standards pertaining to the operation and maintenance of coal combustion waste
impoundments.

Chernikov, Sergei
From:
Stowe, Allen [[e-mail]]
Sent:
Wednesday, May 19, 2010 11:31 AM
To:
Chernikov, Sergei
Cc:
Burrell, Donna L
Subject:
Marshall Steam Station - Draft NPDES Permit Comments
Sergei,
Duke Energy Carolinas, LLC has reviewed the draft NPDES permit for Marshall Steam Station and offers the following
comments:
1. Note that we plan to transition our facilities to the NC DENR eDMR system in the future. Therefore, some
revision of or interpretative guidance associated with boiler plate language in the permit requiring written
signatures may be in order.
2. Change "Duke Energy Corporation" to read "Duke Energy Carolinas, LLC" throughout the permit.
3. In the cover letter it states that monitoring for arsenic, chloride, mercury and nickel cannot be eliminated for
Outfall 002 because the Division needs these data to conduct a Reasonable Potential Analyses. Mr. David
Renner, General Manager at Marshall, received a letter from the Division on June 15, 2009 regarding a major
permit modification request. This letter seems to suggest that a Reasonable Potential Analysis (RPA) was
performed at that time (and this RPA is also addressed -in the "Fact Sheet for NPDES Permit Development'
although the RPA wasn't actually included with the fact sheet) and found that the maximum predicted values
demonstrated no reasonable potential to exceed state water quality standards or acute criteria, and weekly
monitoring was reduced to quarterly monitoring during the permit revision in 2009. Please explain why this
Reasonable Potential Analysis won't suffice for this current request.
4. Supplement To Permit Cover Sheet, #2, should read as follows "Continue to operate a FGD wet scrubber
wastewater treatment system discharging to the ash settling basin through internal outfall 004; and..."
5. Part I, 2. Effluent Limitations and Monitoring Requirements (Outfall 002) — Change Footnote #4 to read as
follows: "There will be a three year compliance schedule for the weekly average and daily maximum limits for
selenium. These limits will become effective on July 1, 2012. See Part I Section A.23 for Selenium Compliance
Schedule." (Note: Suggested language for Part I Section A.23 is listed in Comment #6 below).
6. Part I, insert #23 - Current permit has the following language: "23. Compliance Schedule for Selenium Limitation
— The permittee shall have a three year schedule of compliance for the effluent limitation for total selenium. The
following are interim milestones for the installation of the proposed treatment system. The date for compliance
with the selenium limit shall be July 1, 2012. Technology selection, treatment system design and obtaining an
authorization to construct permit for the wastewater treatment system by August 31, 2010. Construction of
wastewater treatment system and commissioning by June 30, 2012. Compliance with selenium limit — July 1,
2012.
Please let me know if any additional information is required on our part. Thanks
Allen Stowe
'EHS Water Management
Duke Energy Carolinas
AIIen.Stowe(@duke-enerRv.com
704-382-4309 (Office)
704-516-5548 (Cell)

April 28, 2010
MEMORANDUM
To: Britt Setzer, Regional Engineer
NC DENR / DEH / Public Water Supply Section
Mooresville Regional Office
From: Sergei Chernikov, Environmental Engineer II, Complex NPDES Unit,
Division of Water Quality (fax -919-807-6495)
Subject: Review of the discharge locations for the following:
Review of Draft NPDES Permit NC0004987
Marshall Steam Station
Catawba County
Please indicate below by June 1, 2010 your agency's position or viewpoint on the facility
listed above. We cannot issue the permit without your concurrence. Please return this form
at your earliest convenience.
RESPONS
This agency has reviewed the draft permit and determined that the proposed
discharge will not be sufficiently close to any existing or known proposed
public water supply intake so as to create an adverse effect on water quality.
We concur with the issuance of this permit provided the facility is operated
and maintained properly, the stated effluent limits are met prior to discharge,
and the discharge does not contravene the designated water quality standards.
Concurs with issuance of the above permit, provided the following conditions
are met:
Opposes the issuance of the above permit, based on reasons stated below, or
attached:
cc: file

REASONABLE POTENTIAL ANALYSIS
Duke- Marshall Stearn-Station--WWTP-
NC0004987
Time Period 01/2006-03/2010 –
Qw (MGD) 8.3 WWTP Class IV
7Q10S (cfs) 60 IWC (%) @ 7010S 17.656
7Q10W (cfs) 60 @ 7Q10W 17.656
3002 (cfs) 0 @ 30Q2 N/A
Avg. Stream Flow, QA (cfs) 278 @ QA 4.423
Rec'ving Stream Catawba River (Lake Norman) Stream Class WS -IV B CA
Outfall 2
Qw=8.3MGD
Legend., Freshwater Discharge
C = Carcinogenic
NC = Non -carcinogenic
A =Aesthetic
4987-rpa-2010.xls, rpa
4/20/2010
STANDARDS &
PARAMETER
TYPE
CRITERIA (2)
PQL
Units
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NCWQS1 Y. FAVI
n #Det MaxPredCw AllowableCw
(1)
Chronlc Acute
Acute: NIA
No limd y c a r
Arsenic
NC
50
ug/L
126 .97
18.8
Chronic: 283
r
Acute: N/A
Arsenic'' -
C
10.0
ug/L
126 97
18.8
Chronic: 226
k a"
3
d
Acute: 15
Cadmium
NC
2 15
uglL
124 1
1.4
y r �`.' ' -. s���,+ F'
_ _ _ _
Chronic:' 11
, ,?R�
Acute: 1,022
No hmd , �, - • ;•; t" �. `' ° +-
Chromium
NC
50 1,022
-
ug/L
123. 9
2.7
ee
_ _ _
Chronic: 283
r
rp
3 � 41- t 1 w�tti s,i
Acute: 7
No hmd action levelstandard
T K
Copper
NC
7 AL 7.3
ug/L
6 4 26.5
e` '
_. _.
Note: n<12
_ _ — _ _
Chronic: 40
r , `
r
- ' ' t
Limited data set,.a,k
,� •` ;
Acute: NIA
No hmd
Chloride
NC
250
mg/L
124 124
738.0
Chronic: 1,416_
t a ,'y s ,1•'
a
r s• _ , 4 a a,�
Acute: 0No
hmd w j;
Iron
NC
1000 N 0.001
ug/L
5 5 4275.6
( a x r
Note: n<12
_ _ _ _
Chronic: 5,664
Limited data set
Acute: N/A
No hmd
Mercury
NC
12
2.0000
ng/L
122 112
9.6614
_ — _ _
Chronic: 68
-s
1 4'
Acute: 261
1
Nickel
NC
25 261
ug/L
124 124
33.1
Chronic: 142
, a� t
Acute: 270
Mamtam the limds u
Selenium
NC
5.0 56
ug1L
156 155
79.5
Chronic: — 28
Acute: 1
No limit action level standard j
Silver
NC
0.06 AL 1.23
uglL
Chronic: —
Acute: 67
No limitaction level standard<' Fa 1,
Zinc
NC
50 AL 67
ug/L
129 129
78.0
s.,' 7
-----
Chronic: 283
'' r
Legend., Freshwater Discharge
C = Carcinogenic
NC = Non -carcinogenic
A =Aesthetic
4987-rpa-2010.xls, rpa
4/20/2010

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ae 'Aug-zo07
1<:�
g.o' 2.0
99,E ,<<
4.0. 2.0
700
4.0 2.0
101'
.
4.0, 2.0
102Oct-2007<
4.0 20
103', Apr -2000
< `4.0i
2.0
104
4 0, 2.0
105 s
<
4 0; 2.0
105
2.0
May 20 , 2008
4 0- 2.0
REASONABLE POTENTIAL ANALYSIS
2-
4987-rpa-2010.xls, data
4!5!2010

REASONABLE POTENTIAL ANALYSIS
13 14 I5 1 7
4987-rpa-2010.xis, data
3- 4752010
Cadmlum
Chromium
Copper
Date Data
BDL-112DL
Results
Date Data
B0Le112DL
Rasulta
Date Data
BDL-1/2DL Results
1 Deo -2006 ,
< 0.5,
0.3
Std Dev: 0.0813
1 4. Aug -2008 , • 1.6'
1.6
Std Dei.
0.2903 1k.
5
25 aid Dev.
25690 1
2 1"-.
< - U.S
0.3
Mean 0.4980
2, Se_p-2008 1.5
1.5
Mean
0.8967 2
5
2.5 Mean
5.5000 2
3:_
y< a -05
0.3
C.V. 0.1632
3 ';'I,
0.5
C.V.
0.3237 3
6
6.0 C.V.
0.4871 3
q -<
OtSE
0.3
n 124
4 t-
0.5
n
123 4
6
8.0 n
8 4
5
G 1r
0.5
,1-
s < 1
0.5
5
9
9.0
5
Sl Od 2007
`1` 125.;
1.3
Mull Factor= 1.0900
6
0.5
Mult Factor=
1.1900 el
7
7.0 Mull Factor=
29400 6
7 t
<x r 1i
0.5
Max Value 1.3 ug/L
7 i i 1-
0.5
Max. Value
2.3 ug/L 7
1
Max Value
9.0 ug/L 7
8
<
0.5
Max Red Cw 1,4 ug/L
8 } . s `< 1:'
0.5
Max. Red (.lv
2.7 ug/L 5
t
Max Fred Cw
- 26.5 ug/L 8
1
9
�1'
<
0.50
9 a< 1`u 1'
0.5
10
•1.
'1
0.50
10
0.5
10
i
10
11 '
t<YYY -1
0.50
11 t i _4 ,..1
0.5
11
$
11
12
1.
0.50
12< - 1
0.5
12i
12
1'
0.50
13 pFFFFFFp<^� '1'
0.5
13
13
4r
< 1
0.50
14 1.17 1�
0.5
14
14
14
5
c 1,
0.60
15 ! < 1
0.5
15,
15
18
1,
0,60
16 '� < 1'
0.5
16,
- 78
17
< 1,
0.60
-
17 r20:
1.0
17
17
18
< 1
0.50
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f� N W NNry 10 0 1. n
A
m
W.
N � -

REASONABLE POTENTIAL ANALYSIS
Zinc
--
BDL=12DL - Rea ults
22.78
-,
'^29=
29.0
Sld Dev.
11.4379
_
17.7
23.0
Mean
20.9051
22.7
`:15;
15.0
C.V. -,
0.5671
24.1
;`��.20.
20.0
n
129
-
22.
22.0
30.77
30.8
.
24.11
24.1Mull
Factor=
1.3000
-
15.07
18.1
Maz. Value
60.0 utl/L
-
19.03
19,0
Max. Fred Cw
76.0 u9/L
19.0
20.1
20.1
22.78
22.8 ,
14.45
14.5
16.21
16.2
17.65
17.7
21.3
21.3
2274
22.7
23.15 ..
-23.2 -......
17.61
17.8 ,
24.1
24.1
25.85
25.9 -
45.74
45.7
37.37
37.4
30.77
30.8
45.73
45.7
46.23'
,46,2
58.54
58.5
53. 01
53.0 -
42. 02
42.0
33.93
33.9
22.93
22.9
19.
19.0
28.6
26.6
28.41
28.4 --
38.19
38.2
27.64
27.6
16.71
16.7
13.67
13.7
6.91
6.9
10.68
10.7
11.84
11.8
11.52
11.6
8.2
8,2
9.43
0.4
10.27
10.3
13.05
13.1 '-
9.26
9.3
10.62
10.8
9.5
9.5
10.18
10.2
11.66
11.8
10.93
10.9
1 0. 7
10.7
6.33
8.3
8.79
8.8
10.
10.0
10.3
10.3
9.86
9.8
15.8
15.8
17.7
17.7
19.4
19.4
15.8
15.8
15.
15.0
21.1
21.1
21.1
21.1
194
19.4
15.6
15.6
14.6
14.6
18.
16.0
26.2
26.2
26.2
26.2
27.4
27.4
23.3--
23.3
20.4
20.4
17.
17.0
15.3
15.3
27.1
27.1
24.5
24.5
20.4
20.4
11.7
11.7
11.4
11.4
5.37
5.4
5.14
5,1
3.8
3.8
-3.3
3.3
8.53
6.5
227
22.7
14.4
14.4
11.3
11.3
11.9
11.9
8.9
8,9
31.5
31.5
27.7
27.7
60.
60.0
43.1
43.1
28.4
28.4
30.5
30.5
18.2
19.2
'4os,
40.6
4987-rpa-2010xis, data
-9- - 4/52010
l -

REASONABLE POTENTIAL ANALYSIS
-10-
4987-rpa-2010.x15, data
4/5/2010
28.8
28.8
26.3
25.3
,:•;37.8
37.8
t
,17
17.0
&7;
5.7
51.3,
51.3
40.3
40.3
28.4
2&4
.._ .. ....
.'25.1
25.1
REASONABLE POTENTIAL ANALYSIS
-10-
4987-rpa-2010.x15, data
4/5/2010

SOC PRIORITY PROJECT: No
To: Western NPDES Unit
Surface Water Protection Section
Attention: Sergei Chernikov
Date: January 19, 2010
NPDES STAFF REPORT AND RECOMMENDATIONS
County: Catawba
NPDES Permit No.: NC0004987
PART I - GENERAL INFORMATION
Physical Location
1. Facility and address: Marshall Steam Station
% Duke Energy
EC13K/Post Office Box 10068320 East Highway 150
Charlotte, N.C. 28201-1006 Terrell, NC 28682
2. Date of investigation: January 13, 2010
3. Report prepared by: Michael L. Parker, Environ. Engr. II
4. Person contacted and telephone number: Allen Stowe, [phone], Donna Burrell,
[phone].
5. Directions to site: The plant is on the right (north) side of Hwy. 150 directly across from
the junction of Hwy. 150 and SR 1841 (Kiser Island Road) east of the community of
Terrell.
6. Discharge point(s), list for all discharge points:
Outfall 001
Outfall 002
Outfall 002A
Outfall 002B
Outfall 003
Latitude: 350 35' 43"
350 36'21"
350 35' 51"
350 35 51"
350 35' 52"
Longitude: 800 57' 52"
800 57' 35"
800 5736"
800 5734
800 5747"
USGS Quad No.: E 15 SW

Page Two
7. Receiving stream or affected surface waters: Catawba River (Lake Norman)
a. Classification: WS -IV and B
b. River basin and subbasin no.: Catawba 030832
C. Describe receiving stream features and pertinent downstream uses: Outfall 002
and 003 enter a portion of Lake Norman used as the cooling water source for the
steam station. The receiving waters in this area are not used for any type of
recreational purposes (such as swimming, fishing, boating, etc.) due to the fact
this area of the lake is separated from the main body of the lake by a concrete
retaining wall that allows cooler waters from the bottom of the lake to pass
through to the power generators. Outfall 001 enters a portion of Lake Norman also
separated from the main body of the Lake by a floating boom. Public access is
restricted inside of the area separated by the boom to foot traffic only, however,
fishing is an allowed use.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
a. Volume of wastewater: 1093 MGD (outfall 001)
8.3 MGD (outfall 002)
Intermittent flow (outfalls 002A & 002B)
0.2 MGD (outfall 003)
1.2 MGD (outfall 004)
b. What is the current permitted capacity: Flow is not limited in the permit for any
outfall. Outfall 001 consists of once through non -contact cooling water, and
intake screen backwash. Outfall 002 is the ash -settling basin discharge, which
also includes the Flue Gas Desulfurization wastestream currently designated as
internal outfall (004). Outfalls 002A & 002B are the yard drain sump overflows,
which have wastewater from the filtered water system, turbine and boiler room
sumps, miscellaneous equipment cooling water, foundation drainage, low volume
wastes, tunnel unwatering, and stormwater from coal pile and rail access areas.
Outfall 003 is the Unit 4 ID Fan Control House cooling water.
C. Description of existing or substantially constructed WWT facilities: The only
existing WWT facilities exist at outfalls 002 and at outfall 004. The WWT
facilities at outfall 002 consist of an aerated lagoon for domestic wastewater
disposal followed by an ash -settling/ disposal basin with CO2 for pH adjustment
prior to discharge. The existing Flue Gas Desulfurization (FGD) treatment
system at outfall 004 consist of equalization followed by clarification, a
constructed wetlands treatment system with equalization, two 1.28 acre wetland
cells, a 0.24 acre rock filter, and a 1.67 acre wetland cell. Settled solids from the
FGD system are removed from the clarifier, and then de -watered by filter presses.
d. Description of proposed WWT facilities: None at the present time.

Page Three
PART III - OTHER PERTINENT INFORMATION
1. Special monitoring or limitations (including toxicity) requests:
a. DPC requests the elimination of monitoring for Total Arsenic, Chloride, Total
Mercury, and Total Nickel at outfalls 002 & 004 based on historical monitoring
data. It would appear from a review of effluent data that support for this request
can be justified.
2. Compliance history: This facility has consistently met the effluent limitations contained
in the subject permit.
PART IV - EVALUATION AND RECOMMENDATIONS
Duke Energy request that the subject Permit be renewed. There has been one change to
the Permit since it was last renewed (addition of outfall 003). Other changes requested in this
renewal are listed in Part III, No. 1 above.
Pending receipt and approval of this request by the NPDES Unit, it is recommended that
the permit be renewed as requested.
F L� `f ~l0)
Signature of Report Preparer Date
Water Quality Regional Supervisor Date
h:\dsr\dsr 10\marsh all. do c

Allen Steam Station
Dissolved oxygen and water temperature measured via a calibrated Hydrolab DataSonde°
at near -surface (0.3 m) and 1 meter depth increments, to within 0.5 meters of the bottom. Graphical
techniques were used to asses selected vertical profile data.
(Assessment of Balanced and Indigenous Populations in Lake Wylie near Allen Steam Station, NPDES
Permit No. NC0004979, Duke Energy, November 2009)
Riverbend Steam Station
At each sampling location (A, B, C, D, E and G), vertical profiles of in-situ parameters (water
temperature, dissolved oxygen, pH and specific conductance) were collected with a Hydrolab
DataSonde®. Readings were taken at near -surface (0.3 m) and 1 meter depth increments, to within 0.5
meters of the bottom. Graphical techniques were used to asses selected vertical profile data.
Water samples for the following chemical parameters were also collected at the sampling sites
listed above:
Total alkalinity
Aluminum
Total Recoverable Arsenic
Barium
Total recoverable Cadmium
Calcium
Total Organic Nitrogen
Chloride
Total Recoverable Chromium
Dissolved Copper
Total Recoverable Copper
Total Recoverable Iron
Total Recoverable Lead
Magnesium
Manganese
Ammonia Nitrogen
Nitrate + Nitrate Nitrogen
Total Kjeldahl Nitrogen
Nickel
Orthophosphate Phosphorus
Total Phosphorus
Potassium
Selenium
Sediment Selenium
Silica (as Si)
Silver
Sodium
Total Solids
Total Suspended Solids
Sulfate
Turbidity
Zinc
Water samples were collected with a Kemmerer bottle at the surface (0.3 m) at each location and
approximately one meter above the bottom at the MIHS forebay (Location G). Sediment cores were
collected at four locations (A, B, C and G).
(Assessment of Balanced and Indigenous Populations in Mountain Island Lake near Riverbend Steam
Station, NPDES Permit No. NC0004961, Duke Energy, August 2009)
Marshall Steam Station
In conjunction with macroinvertebrate sampling, a calibrated Hach° HQ40d water quality meter was used
to measure dissolved oxygen meter was used to measure water temperature and dissolved oxygen
above the sediment at each location.
((Assessment of Balanced and Indigenous Populations in Lake Norman near Marshall Steam Station,
NPDES Permit No. NC0004987, Duke Energy, October 2009)

,-Chernikov, Sergei
From: Tracy, Bryn
Sent: Wednesday, November 18, 2009 6:52 AM
To: Belnick, Tom; Chernikov, Sergei
Cc: Chernikov, Sergei
Subject: RE: Duke/Marshall Steam NC0004987
Attachments: image001.png
Tom and Sergei -- Cita9
I raised these concerns five years ago when I reviewed the 2004 Duke Power Company report. Here are the locality and
the surface dissolved oxygen data:
1. Station B, 15L cove along northern shoreline going into the MSS CCW discharge cove, 35.5942/-80.9573
a. 7/18/2000, 1.9 mg/L ,3 g�Cu� Sw�-,�-D"�i, _ -4
b. 7/17/2001, 2.9 mg/L
c. 7/11/2002, 3.1 mg/L
d. 7/15/2003, 2.8 mg/I
e. 07/06/2004, 6.3 mg/L
L
f. 07/20/2005, 37 m g/ I
g. 07/03/2006, 3.7 mg/L
h. 07/10/2007, 2.8 mg/L
L 07/09/2008, 2.6 mg/L 9
2. Station C, inside MSS discharge canal, 35.5951/-80.9644
a. 7/18/2000, 0.7 mg/L
b. 7/17/2001, 0.8 mg/L
c. 7/11/2002, 1.7 mg/L �j rti
d. 7/15/2003, 1.6 mg/L A Z K
e. 07/06/2004, 1.9 mg/L
f. 07/20/2005, 1.7 mg/L
g. 07/03/2006, 1.9 mg/L y
h. 07/10/2007, 1.3 mg/L w� S
S w. _ 6 ,a•.
i. 07/09/2008, 1.2 mg/L
Here is the map:
'A� M
tl N.
luaw.1
c
4

PLEASE NOTE NEW E-MAIL -- [e-mail]
Bryn H. Tracy
Sr. Environmental Specialist

LOCATION
TIME
DATE
DEPTH
TEMP
DO
ELEVATION
(m)
(deg, C)
mg/L
(mmsl)
15.0
12:53
7/9/2007
0.3
31.04
7.40
230.2
15.0
12:53
7/9/2007
1.0
30.64
7.40
229.5
15.0
12:55
7/9/2007
2.0
29.51
7.10
228.5
15.0
12:56
7/9/2007
3.0
29.09
7.00
227.5
15.01
'12:57.
7/9/2007
4.0
28.63
6.70
226.5
15.0
12:58
7/9/2007
5.0
28.12
6.20
225.5
15.0 -
12:59
7/9/2007
6.0
27.77
5.80
224.5
15.0
13:00
7/9/2007
7.0
27.55
5.20
223.5
15.0
13:01
7/9/2007
8.0
27.29
4.50
222.5
15.0
13:02
7/9/2007
9.0
26.86
4.00
221.5
15:0.
13:03
7/9/2007
10.0
26.61
2.70
220.5
15.0jl;,
13:04
7/9/2007
11.0
25.89
1.20
219.5
15.0`,
13:05
7/9/2007
12.0
24,79
0.20
218.5
15.0;
13:06
7/9/2007
13.0
24.07
0.10
217.5
15.0;'
13:07
7/9/2007
14.0
22.92
0.10
216.5
15.0j
13:08
7/9/2007,'
,15 0
X212
0 0 H
X215 5
15 Oz
13:08
7/9/2007
16M
1
45
15.61
13:09
7/9/2007
fl
17 90�
0 60 q
'213 5
15.0.
13:10
�F17
7/9/2007
�8 0�
,X16 69
a �0 0
2'12.54*,
15.0
13:10
7/9/2007
19�
16 07
1 10
211 5 .
15.0
13:11
7/9/20074
O1S�G`
-u
10.;20
5
15.0
13:11
7/9/2007
21.0
15.31
1.20
209.5
15.0
13:12
7/9/2007
22.0
15.24 '„
1:20 :'
-208.5
15.0
13:13
7/9/2007
23.0
15.23
1.10
207.5

Most probable withdrawal zone;

LOCATION TIME DATE
15.0 11:58:39 7/7/2008
15.0 11:59:14 7/7/2008
15.0 11:59:59 7/7/2008
15.0 12:00:39 7/7/2008
15.0 12:01:24 7/7/2008
15.0 12:02:09 7/7/2008
15.0 12:02:54 7/7/2008
15.0 12:03:39 7/7/2008
15.0 12:04:24 7/7/2008
15.0 12:05:44 7/7/2008
15.0 12:06:39 7/7/2008
15.0 12:07:59 7/7/2008
15.0 12:08:59 7/7/2008
15.0 12:10:14 7/7/2008
15.0 12:11:14 7/7/2008
15.0 12:12:29 7/7/2008
15.0 12:13:14 7/7/2008
15.0 12:14:44 7/7/2008
15.0 12:16:14 7/7/2008
15.0 12:17:19 7/7/2008
15.0 12:18:04 7/7/2008
15.0 12:18:54 7/7/2008
15.0 12:19:59 7/7/2008
15.0 12:20:34 7/7/2008
15.0 12:21:04 7/7/2008
DEPTH TEMP DO ELEVATION
(m) (deg C) mg/L (mmsl)
0.3
28.04
7.2
230.5
1
28.05
7.2
229.8
2
28.04
7.1
228.8
3
28.03
7.1
227.8
4
28.02
7.1
226.8
5
28
7
225.8
6
27.98
6.9
224.8
7
27.93
6.8
223.8
8
27.85
6.4
222.8
9
27.15
3.7
221.8
10
27.06
3.4
220.8
11
26.49
2
219.8
12
25.81
1.1
218.8
13
24.24
0.1
217.8
14
22.67
0.1
216.8
15
®' 21.92' "
0:1
215:$
16
20:41
0.5 _ ,
214.8
11" '
`° 18.37
1
' 213.8
18
17.'65
1.1
212.8
19
16.37
1.4
211.8
20
15.85`
"1:5',
210.8
21
15.69
1.5
209.8
22
15.55
1.5
208.8
23
15.48
1.5
207.8
23.4
15.48
1.5
207.4

Ir ._
4 Most probable withdrawal zone

LOCATION TIME DATE
15.0
12:36:04
7/5/2006
15.0
12:38:34
7/5/2006
15.0
12:39:44
7/5/2006
15.0
12:40:34
7/5/2006
15.0
12:41:34
7/5/2006
15.0
12:43:09
7/5/2006
15.0
12:44:29
7/5/2006
15.0
12:45:29
7/5/2006
15.0
12:46:14
7/5/2006
15.0
12:47:09
7/5/2006
15.0
12:47:49
7/5/2006
15.0
12:48:34
7/5/2006
15.0
12:49:34
7/5/2006
15.0
12:51:14
7/5/2006
15.0
12:51:49
7/5/2006
15.0
12:53:00
7/5/2006
15.0
12:53:50
7/5/2006
15.0
12:54:20
7/5/2006
15.0
12:54:50
7/5/2006
15.0
12:55:35
7/5/2006
15.0
12:56:15
7/5/2006
15.0
12:57:10
7/5/2006
15.0
12:57:50
7/5/2006
15.0
12:59:35
7/5/2006
DEPTH
TEMP
DO
Elev
(m)
(deg C)
mg/L
(mmsl)
0.3
30.13
7.2
230.4
1
30.15
7.2
229.7
2
30.14
7.1
228.7
3
30.12
7.1
227.7
4
29.87
6.9
226.7
5
29.24
7
225.7
6
28.24
5.9
224.7
7
27.7
5
223.7
8
27.31
4.4
222.7
9
26.84
3.7
221.7
10
26.19
2.9
220.7
11
25.18
1.8
219.7
12
24.17
0.8
218.7
13
23.22
0.1
217.7
14
21.83
0.1
216.7
21 15.25 1.2 209.7
22 15.2 1.1 208.7
23 15.15 1.1 207.7

Most,probable withdrawaluzone

0
Marshall
Steam
Heated Discharge Station
Water
go • • • 00
:. Condense
0 go •
Intake Canal
Cold Water Used Skimmer Wall
For Cooling
go see 0 0 00
......:...t '
• •,.•, Lake Norman ;, ; ; :' •••, •
•. : •:•.•••.��r •�• .` • ��.
Lake Bottom
Bottom of
Skimmer Wall -
213.6m
Figure 1-7. Schematic of Marshall Steam Station intake and discharge con-
figuration during a typical late spring or early fall. The
elevation given is referenced to mean sea level. (Not drawn
to scal.e)
29
-23i. V
eu— Ste'
lwd

• ,1 '� ' t ,. 1 > } .,�. -r(�/. +a'F�r Q'�Ut f''! f a -r 3 (,._ ' 111 1i„ i "' -M� ute.t;:. '`f } 11 C r� \ �yi l{ i1��;�`��� � . I J ' r ..'��
. � '- •� �...�� �' f ' 1" I + r . � �y �'Si Vii" iJ7 'r.^�'S .�,�'ril 1 I'��',. yY `� � .. :^fit^t �dr%� - f ' � ��� �1 ��' �� '•�+ i I •--•_
, ,'•`� I fi �.� �: • j'-- f �3Y �J �., ' t ^i,;^ "� :r•LY'.',i.,,, - "t �; � ' t ., 1 � �/f
,� � '+ � �r J � rr tlri f */ � r f >( .d--' ,r M 31 � 3 � , 1� ilf "' •^
,y Y� r�� { f r � � r f � ��,1 �'� la� � ° ` 1 � •`�t(rlrr�f ,�a- ...-� ys`° s x� ',� ���.'�,q {f r `,
.. iy `v+.`.J ' � •\, ` ''. ( ��t .�! `! Jr �} 4 � f -� I '- 7 r �� h �{,41 t, ' f•'1 .
rr �_ ,+ I� f �iy . ' J 1 � ;� 1�^,`^•;.:' .,1„r�' ..; t� ,r� - ••.:� ` .t .��M;y ' s r r 5j 1 �' - I
,.a . � �` ' L•„J�fr �``;.j � ��j.��`5�'.;'-T,, �' � .-9,, a r � '�I `� '.5f �� � .`thy ,7�'`= . _� k !
lccyy,,, ,� � � l l ! � „�. •:. i'Sf. �.y� h'`�� 3 1
, .'•r S�`\ erf �iJ./� • >•' / / - 1 �;, f rr� �r ��'j',�r'-",--�'-� . � - �. , ,i Y � � 5.><- .I
p 1 I I( ` { r r� r ��I\I � �t vf..��5 9 + I ' .. r fj '_I Y"� �f � �i.�. 'l• I ! .
h � r_- l\ +; I �irr.:} '+ !t`•-. ��1 r F�55A� 14f y rI rC � � .q-^ ' � �`�N,� d $�/i '
j`^`'.,q.J •�`. .ter. � 5l; f r� �$$ . ti� ^ ., p� K �'w� % ..I
�`, ; � \I �\ ,1 ._�,.ti` \ �, `. � • •., .,,�, ! 4' __•- °fir � I„� ,�
a l` �..' ,�tA+ 4.,., ` `, `-�°� t f�j � fr � f'/'�1 j j _ ''`w-'.� 5� `' JI •s+,f �•� �i^�`•-�.': f_,'
f C.) 4� �-.g , ✓r �+s i � '4' 1 r = `�, 5 �} r r} � _ � r 4 s• �a f . �'�\ , ti.:-- i
�"� as ��1'' , , ,bt II •�� '";,'�' - r9"`\ ��%;+ / ter'" ~`~ ",.P`r. 9 f�}• F ��"'`'1A {;?I� ��
Qe.�-1�
.rns_'1'.[ �',�„1`''ti. fy r1'� � �� �V,{ �•��(;�',,`1�y4 f✓` r✓ Pffr� r rr fr' ilk +il'f�,�dl,�j11 ,,,,,
1.♦ l� r� .� : �y;(�ar�f�+5
i.§__4'U`rlf ,r•� - - r 'rf lj V.
ri
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PLEASE NOTE NEW E-MAIL -- [e-mail]
Bryn H. Tracy
Sr. Environmental Specialist
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Bottom of '
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Figure 1-7. Schematic of Marshall Steam Station intake and discharge con-
figuration during a typical late spring or early fall. -The
elevation given. is referenced to mean sea level. (Not drawn
to scale)
29 -
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figuration during a typical late spring or early fall. -The
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to scale)
29 -

Duke
(Energy®
October 26, 2009
CORPORATE EHS SERVICES
Duke Energy Corporation
526 South Church St.
Charlotte, NC 28202
Mailing Address:
EC13K / PO Box 1006
Charlotte, NC 28201-1006
Mr. Charles ,H. Weaver, Jr.
State of North Carolina;4 0.10,4-
Department of Environment and Natural Resourc "Ow
Division of Water Quality
NPDES Unite
1617 Mail Service Center.
Raleigh, North Carolina 27699-1617
®10ATER (QUALITY
Subject: Duke Energy Carolinas, LLC — NPDE jk�Steg BRANCH
Marshall Steam Station - #NC000498
Dear Mr. Weaver:
Duke Energy Carolinas, LLC requests the subject permit be renewed and reissued.
The above referenced permit expires April30, 2010. As mandated by North
Carolina Administrative Code 15A NCAC 2H.0105 (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
EPA Form 2F
Site Maps
Water Flow Diagram .
Supplemental Information
Duke Power requests notification that this application is complete.
V_.,.
Additionally, the attached report, "Assessment of Balanced and Indigenous
Populations. in Lake Norman Near Marshall Steam Station," continues to indicate
the maintenance of a balanced indegnious populations. Therefore, this report
supports renewal of the current thermal monitoring requirements of outfall #001.
www.duke-energy.com

The elimination of monitoring for the following parameters at outfalls #002 and
#004 is requested based on historical monitoring data.
• Total Arsenic
• Chloride
• Total Mercury
• Total Nickel
Thank you in advance for your assistance on this matter. Should you have
questions regarding this application', please contact'me at [phone].
Sincerely,
d2&
Allen Stowe
Water Management
Attachments
cc w/: Mr. Robert Krebs - NCDENR Mooresville R.O.
Mr. Jay Sauber — NCDENR, Raleigh, N.C. (BIP Report 3 copies)