NCS000548_Email re Modifications_20200709

McCoy, Suzanne
From:Lucas, Annette
Sent:Thursday, July 16, 2020 1:40 PM
To:McCoy, Suzanne
Cc:Georgoulias, Bethany
Subject:FW: \[External\] Follow up items
Attachments:Marshall Industrial Storm Water Permit New Outfall SW026 7-8-20.pdf; Marshall ISW
Permit Renewal Application NCS000548 (002).pdf
Suz, Can you please file this in LF? A

From: Langley, Shannon \[mailto:[e-mail]\]
Sent: Thursday, July 9, 2020 4:27 PM
To: Lucas, Annette <[e-mail]>
Cc: Wylie, Robert R <[e-mail]>; Georgoulias, Bethany <[e-mail]>
Subject: \[External\] Follow up items

CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
[e-mail]

Annette,

It was nice talking to you today. Attached is the application update for Marshall that was signed yesterday along with
the original submittal of the renewal request. Questions about yesterday’s submittal can be directed to Robert Wylie.

At Marshall this action is intended to redirect some existing upland flow (mostly wooded/vegetated with light industrial
activity) away from the ash basin drainage to facilitate closure activities. The flow that will be redirected is currently
permitted under NPDES as part of the NPDES permit NC0004897 so it seems as if a minor modification could be an
option to issuance. With that action, the renewal could sit until the Department is ready to issue from our perspective.

I also spoke with Robert Wylie about Asheville. We have contracts in place with a third party to complete the renewal
application and submittal in October of this year. Given the amount of items needed to be completed, there does not
seem to be a clear path to expediting that to complete in the next two weeks. We can discuss that one when I give you
a call tomorrow but I wanted to give you a heads up on that. It seems that acting on the amendment request from
January of this year is preferable and then, as with Marshall, you could hold the renewal until the time the agency is
ready to issue the renewals.

I think the approach listed below is viable to work through these 4 sites and will plan on suggesting same to the
Department management next week if you don’t object.

Dan River – Minor mod to redirect flows as planned.
Asheville – Act on renewal request submitted in January, 2020 to have amendment in place January 1, 2021. Duke will
submit renewal in timeframes required by the permit but the Department can choose hold renewal until Department is
ready to issue without concern from us.
Marshall - Minor mod to relocate NPDES permitted flows from current discharge point in permit NC0004897 to new
location under NCS000548. These are existing NPDES flows and existing activities: just redirection.
Belews Creek – Same concept as with Marshall above. Flows to be re-directed currently exist but are released at a
different point.
1

I will give you a quick call tomorrow as discussed so let me know if there are concerns with this approach.

Thanks again for looking at this with me.

Shannon

E. Shannon Langley
E. Shannon Langley | Duke Energy | EHS-CCP Environmental Programs
Principal Environmental Specialist
411 Fayetteville Street | Mail Code NC15 | Raleigh, NC 27601
Office: 919.546.2439 | Mobile: [phone] | [e-mail]

2

C& DUKE
C ENERGY.
October 24, 2019
Suzanne McCoy
NCDEMLR Stormwater Program
1612 Mail Service Center
Raleigh, North Carolina 27699-1612
Subject: Duke Energy Carolinas, LLC.
Marshall Steam Station
NPDES Stormwater Permit NCS000548
Permit Renewal Application
Dear Ms. McCoy:
Duke Energy
Marshall Steam Station
8329 East NC Hwy 150
Terrell, NC 28682
828-478-7700
Duke Energy Carolinas, LLC requests the subject permit be renewed and reissued. The subject
permit expires on April 30, 2020. Section III Part B of this permit requires the permit application
for permit renewal to be submitted at least 180 days prior to the expiration date of the permit.
Attached is the renewal application form and duplicate copies of the supplemental information.
The fish tissue monitoring results are also included as required by the letter dated October 2,
2017 from Ms. Annette Lucas of NC Division of Energy, Mineral and Land Resources to Mr.
Shannon Langley of Duke Energy.
Should you have questions or need additional information please contact Robert Wylie at 704
382-4669.
7Sin ely,
Jcv
Rick Roper
General Manager III
Marshall Steam Station
Attachments:
Renewal Application Form
Supplemental Information
Site Map from the Stormwater Pollution Prevention Plan
Summary of Analytical Monitoring Results
Summary of Visual Monitoring Results
Narrative of Significant Site Changes
Certification of the Development and Implementation of the SPPP
Fish Tissue Monitoring Results (Part II Section B Page 12 of 17)
www.duke-energy.com

APIA
Permit Coverage
Renewal Application Form
NCDEHR National Pollutant Discharge Elimination System NP C Permit Number
N
Stormwater Individual Permit S000548
Please provide your permit number in box in the upper right hand corner, complete the information in the space provided
below and return the completed renewal form along with the required supplemental information to the address indicated.
Owner Information
* Address to which permit correspondence will be mailed
Owner / Organization Name:
Duke Energy Carolinas, LLC
Owner Contact:
_
_ p ULDrAgvjtrh _
Mailing Address:
526 S Church Street Mail Code EC3XP
Charlotte, NC 28202
Phone Number:
980 373-0408
Fax Number:
E-mail address:
Paul.Draovitch( duke-energy.com
Facility Information
Facility Name:
Marshall Steam Station
Facility Physical Address:
8329 East NC Hwy 150
Terrell, NC 28682
Facility Contact:
Scott La Sala
Mailing Address:
—SamC.ALE'Vjlihr
Phone Number:
828 478-7820
Fax Number:
E-mail address:
[e-mail]
Permit Information
Permit Contact:
Robert Wylie
Mailing Address:
PO Box 1006 Mail Code EC13K
_Charlotte. NC 28202
Phone Number:
704 382-4669
Fax Number:
704 382-1681
E-mail address:
Robert.Wvlie(dduke-energy.com
Discharge Information
Receiving Stream:
Catawba River
Stream Class:
WS-IV, B, CA
Basin:
Catawba River Basin
Sub -Basin:
Number of Outfalls:
10
Facility/Activity Changes Please describe below any changes to your facility or activities since issuance of your permit. Attached a
separate sheet if necessary.
1. Addition of outfall SW025
2. Closing of outfalls SW001, SW001A, SW006, SWO09 and SW0023. Note SW024 was permitted but never built.
3._ Update of drainage area of SWO12
4. Addition of new on -site facilities - Lined Retention Basin and Holdino Basin
CERTIFICATION
I certify that I am familiar with the information contained in the application and that to the best of my knowledge and belief
such information(TVe, cpmplA and accurate.
Signa
Rick Roper
Print or type name of person signing above
October 24, 2019
Date
General Manager III
Title
Please return this completed application form SW Individual Permit Coverage Renewal
Stormwater Permitting Program
and requested supplemental information to: 1612 Mail Service Center
Raleigh, North Carolina 27699-1612

Marshall Steam Station
Storm Water Permit NCS000548
Individual Permit Application
Supplemental Information

SUPPLEMENTAL INFORMATION REQUIRED FOR RENEWAL OF INDIVIDUAL
NPDES STORMWATER PERMIT
Two copies of each of the following shall accompany this submittal in order for the application
to be considered complete:
(Do not submit the site Stormwater Pollution Prevention Plan)
Initials
RRW 1. A current Site Map from the Stormwater Pollution Prevention Plan. The location of
industrial activities (including storage of materials, disposal areas, process areas and
loading and unloading areas), drainage structures, drainage areas for each outfall,
building locations and impervious surfaces should be clearly noted.
RRW
2. A summary of Analytical Monitoring results during the term of the existing permit
(if your permit required analytical sampling). Do not submit individual lab reports.
The summary can consist of a table including such items as outfall number,
parameters sampled, lab results, date sampled, and storm event data.
RRW
3. A summary of the Visual Monitoring results. Do not submit individual monitoring
reports. The summary can consist of a table including such items as outfall number,
parameters surveyed, observations, and date monitoring conducted.
RRW 4. A summary of the Best Management Practices utilized at the permitted facility.
Summary should consist of a short narrative description of each BMP's in place at
the facility. If the implementation of any BMP's is planned, please include
information on these BMP's.
RRW 5. A short narrative describing any significant changes in industrial activities at the
permitted facility. Significant changes could include the addition or deletion of
work processes, changes in material handling practices, changes in material storage
practices, and/or changes in the raw materials used by the facility.
RRW 6. Certification of the development and implementation of a Stormwater Pollution
Prevention Plan for the permitted facility (Sign and return attached form).
If the final year analytical monitoring of the existing permit term has not been completed
prior to filing the renewal submittal, then the last years monitoring results should be submitted
within 30 days of receipt of the laboratory reports. (i.e. do not withhold renewal submittal
waiting on lab results)

Attachment 1
Site Map

Fa's-' LiFit�'C RALFLL '� - b• ��f:.
LEGEND
Outfalls ✓ X
Drainage Area (DA) Boundary Property Boundary «.
®Drainage Area with Associated
Stormwater Outfalls 0 MT Ell
STRUCTURE LEGEND ` f r wET�l1AIJ7rtulE STEM I d
t
Elevated Water Tank
O Fuel Oil Unloading Area
ER
3 Fuel Oil Tankspy~
4
® Urea Tanks
OCommunity Building
h
g Precipitator Units 3 & 4 t Carr t!L „ 1 A'fA
r t �
oISTRAC
\°[5r1L'VN'. $",. - ��•.
•r� � a P ` -'"-Ar2ka� � 4 AID ti �rf "x �� Q- ,� TF L 00
0 Powerhouse Units 1-4' t'
© Gypsum 8 Limestone Conveyor Belts MERGED
L1 S rya
' �— •
Y s P NC 'E70. si, Y. (gNVE O
g SCR Area a
e
SIE1 MENT J ` TFALL 3
O
10 Stormwater Collection
O Pond :d ,� LW94N * ,.
11 Electrical Building ` { ` i L'�
HCtLD Nd y , M
s. •' *. r
Ball MITI s F t, �� SEDIMENT WESTERN COAL�ARD l
12 Vu S`" • ' 84SIN W COMIECTIOt� n,
13 Reagent Feed Tanks cb
•�tiN PiF;
Lip -
if
14 Scrubber Site N k
16 OM
Service Building and Warehouse' - ; rf o q�'
�,����` ` ��� PDESO FALL 5
16 Sump#1 and#1A =: •r
_ _ a%A` i�•+' ' POESO FALL00 L
1% Sump #Z G M P OUTFACE r
LOAD �' - �'� Pdti � � •'� °
16 Intake
a �' � � NPDESO TFAiL B ,
►' - i p� l 17 L SWDOB
19 Urea Tank Farm to ARD 14 {{
MP
0 Retired Constructed Wetland ti 1 DH i OUTF
,, D��MP
Treatment System LIMESTONE STACKER DA
©1 Limestone Area Stormwater Basin 10 J '
� a 9 ` ; r * ..►1 it 11 12 1�oy -
© KEYMA P
New Wastewater Treatment System '. sa �' r NP IrrF oos G
g
- Shf el.ie
FLra
bvm
e 3 ••' OD+iFALL
0 Feet 500
•.•
•
s
N'i •n ` y�
2 t. S OUTFACE -a ota !
•. f
4 �
* °y EWRANCE Tar=DN riTmowaa
NOTES: 1. SWO01 AND SW001A HAVE BEEN DELETED FROM THE STORMWATER PERMIT AND ARE NOW MONITORED WITHIN THE WASTEWATER PERMIT MARSHALL STEAM STATION
DUKE 2• SW005, SWO13 THROUGH SW021 HAVE BEEN ABANDONED
FN' ENERGY 3. NEWLY CONSTRUCTED WASTEWATER TREATMENT (FORMER DRAINAGE AREA SW023) IS NOW ROUTED TO PERMITTED WASTEWATER LINED RETENTION BASIN SITE PLAN STORMWATER OUTFALLS
4. SW006, SW009, AND SW023 HAVE BEEN CANCELLED FROM THE STORMWATER PERMIT
5. SW024 WAS PROPOSED IN THE STORMWATER PERMIT BUT WILL NOT BE INSTALLED DUKE ENERGY CAROLINAS, LLC
MTN •ELTSYAINe %,DATA$ISV OJECTSOa>•J,DUN NEROVUA\RSNALLSTEAYSTATNJ APDOCS%STEPLAN_StORY ATEROUTFALL5_10f1 EVWD USER DYARC—A DATE SN 1-9 SHEET OF 2

KEYMA P
` LDko Norman
rerr•n or Cmnwoa
I
.V \
ONSITE.OA ''l' �'
R
F
T, �t
* s 40
s 1`j •
.49DUKE
�I _
Jim
V' EENERGY
LEGEND
Property Boundary
- - Pipeline
— — " • • •; Drainage Area (DA) Boundary
R. Drainage Area with
® Associated Stormwater
,�. Outfalls
NW R
r.
_ 1 1
0 Feet 500
TS r-
•a
t
PE NET r
` L 5
{ M 1
't:- O 'FALL 025
II
a 180 ASH D L
r, (PHASE 2)
MIT NO.
6r
Stornvmter 31;t a: Oascrrptr�r a� d a�raga Irtpervlous Permit
Outfalls Coordinates Recelvtng iYarter Body I y'Area qr� I Monitoring Drainage Area Runoff Description
Table
a SWO02 35' 35' 53" N 24-inch CMPto the Catawba 33 0% 1 Drainage area runoff fran miscellaneous
80' 57' 50" W River (Lake Norman) materials storage area along the intake canal.
SWO03 35' 35' 11" N Rip rap ditch to the Catawba 35 0% 1 Drainage area runoff from miscellaneous
J.y 80' S7' 6T' W Rner (Lake Norman) materials storage area along the intake canal
aR'r
Y
t 35' 36' 01" N 3riinch.diameter HOPE to the Drainage area runcf from a portion of ash basin
SW004 80' S7' 48^ W Catawba River (Lake Norman) 0 8 2 embankment west of ash silos & haul road.
Drainage area runoff from the switchyard,
SWO07 35' 35' 56" N 60 inch diameleCMP to the 38.2 5% 4 Powerhouse yard red lines, and areas extending
80' 57' 51" W Catawba River (Lake Norman) west to the gypsum haul road, all into the intake
canal
Y 35' 35' 53" N 8 nder CMP ch-darrto the 01 70% 5 Drainage area runoff from patted area east of the
SW008
80' 57 50" W I Catawba River (Lake Norman) �, Powerhouse into the intake canal
} I Drainage area runoff fran the plant entrance,
35' 35' 43^ N 24-inch-dameler HOPE to the
SW011 80' 57' 52^ W Catawba River (Lake Norman) 54 5% 7 }bdween the fuel unloading drives and pubic
J
lroadwa
r r f
SWO12 35' 35 50' N 118-inch diameter HDPE to the 2 10% 8 Drainage area from scrubber Acindy undenmth
r 80' 57' 4T' W Catawba Riser (Lake Norman) 1 ductwork upgradent of intake canal.
n ; s. t�, I Drainage area runoff from gravel laydown and
t SW012A 35' 35 57" N Ditch to the Catawba River 1 0% 8 wooded yard areas oaof and west the FGD
80' S7' 44' W I (Lake Norman) faaNty draining west to the intake canal
sz 18 inch.cl ameter corrugated Drainage area runoff from gravel lay down arid
35' 35' 44" N
SW022 �. �. 57, W HDPE to the Catawba River I 08 0% 9 wooda4 yard arms and FGD access road area
11 eke Norman) into the discharge canal.
OQsite drainage flouting onsde from the
35' 35' 44" N Of ite drainage area with sarlhwest and industrial stamwaler from the
SWO25 80' 57' 52" W temporary southwest ponds 222.6 0% NA I New Oulfall structural fill is collected within an onsde pond
(East & West) and pumped nath and east to the drainage area
d outfall.
MARSHALL STEAM STATION
SITE PLAN STORMWATER OUTFALLS
DUKE ENERGY CAROLINAS, LLC
- KITIY NOPSDATAi ISVBD)ECTS=L _DUNEEwEPOT�RN ALLSTEA�STATgN'.WPD MUTEPSAx-STON�atEB TFI.rES,2 FF EVBUM USER -RC- 6nTE1-5 SHEET 2OF2

Attachment 2
Summary of Analytical Monitoring Data

October 2019
DUKE
"� ENERGY
SUMMARY OF LABORATORY ANALYSES
INDUSTRIAL STORMWATER
MAY 2015 - JUNE 2019
NPDES Stormwater Permit NCS000548
Marshall Steam Station
y�
b
C,� °� . c, of of •.� � � c° is a
UNITS
PH
mg/L
ug/L
ug/L
ug/L
mg/L
ug/L
ug/L
ug/L
ug/L
ng/L
ug/L
ug/L
ug/L
ug/L
I mg/L
mg/L
mg/L
PERMIT BENCHMARK
6-9
15
90
340
65
*
3
900
10
75
**
335
56
0.3
10.126
ANY
100
STORMWATER
OUTFALL
COLLECTION
RAINFALL
11/30/2015
0.82
7.5
< 1
1.42
< 1
< 0.05
< 1
3.07
7.88
2.89
7
2.16
1.32
< 0.3
< 0.2
0.02
--
47
6/27/2016
0.98
7.5
--
--
--
--
11
12/29/2016
0.15
7.1
--
-
--
--
-
-
-
--
--
5
6/22/2017
0.07
7.5
--
--
-
--
-
-
--
--
-
< 5
SWO02
12/5/2017
0.34
7.6
-
--
--
-
-
--
-
-
52
6/25/2018
0.17
7.2
-
-
-
-
-
--
29
11/12/2018
2.16
7.7
-
-
6.6
6/7/2019
0.58
7.4
--
-
--
-
-
-
-
-
59
11/30/2015
0.82
7.6
< 1
2.38
< 1
< 0.05
< 1
< 1
2.61
< 1
4.18
< 1
1.19
< 0.3
< 0.2
< 0.005
8
6/27/2016
0.98
7.5
--
--
-
--
-
--
-
--
--
--
--
79
12/29/2016
0.15
7.4
-
30
SW003
6/22/2017
12/5/2017
0.07
0.34
7.9
7.6
�I
11
I
I -
--
I
��I
I -
I
-
--
I I
I __
-
--
-
_
I`
--
I
I 40
I 330
6/25/2018
0.17
7.3
66
11/12/2018
2.16
7.4
6/7/2019
0.58
7.3
-
I
-
-
-
-
-
--
I 22
1 of 5 www.duke-energy.com

October 2019
4 DUKE
N ENERGY
SUMMARY OF LABORATORY ANALYSES
INDUSTRIAL STORMWATER
MAY 2015 - JUNE 2019
NPDES Stormwater Permit NCS000548
Marshall Steam Station
y�
� F �
C�` oc •.� .�� •.�� '�� � � • of F a
UNITS
PH
mg/L
ug/L
ug/L
ug/L
mg/L
ug/L
ug/L
ug/L
ug/L
ng/L
ug/L
ug/L
ug/L
ug/L
mg/L
I mg/L
mg/L
PERMIT BENCHMARK
6-9
IS
90
340
65
*
3
900
10
7.5
**
335
56
0.3
*
0.126
ANY
100
STORMWATER
OUTFALL
COLLECTION
RAINFALL
11/30/2015
0.82
7.7
--
< 1
6.57
< 1
0.079
< 1
< 1
3.28
< 1
13.4
< 1
2.96
< 0.3
< 0.2
< 0.005
< 0.40
22
SW004
11/12/2018
2.16
8.0
--
1.34
31.5
1 1.22
0.121
< 1
12.5
16.8
9.14
126
9.45
11.6
< 0.2
0.636
0.068
< 0.40
100
12/14/2015
0.10
9.4
<4.0
<1
1.45
<1
<0.05
<1
3.36
5.84
1.96
8.39
3.22
1.24
< 0.3
< 0.2
0.173
< 0.40
54
6/27/2016
0.98
7.2
< 4.0
< 1
< 1
< 1
< 0.05
< 1
1.34
4.04
1.38
6.2
2.08
< 1
< 0.3
< 0.2
0.069
< 0.40
39
12/29/2016
0.15
7.0
< 4.0
< 1
1.91
< 1
< 0.05
< 1
3.35
9.63
3.19
6.88
4.86
1.53
< 0.3
< 0.2 1
0.075
< 0.40
46
6/22/2017
0.07
7.2
< 4.0
< 1
< 1
< 1
< 0.05
< 1
3.04
4.69
< 1
5.22
3.22
1.45
< 0.3
< 0.2
0.107
< 0.40
12
SWO07
12/5/2017
0.34
7.4
< 5.6
< 1
2.58
< 1
< 0.05
< 1
5.82
9.92
4.03
2.06
6.11
2.87
< 0.3
< 0.2
0.138
< 0.40
72
6/25/2018
0.17
7.8
< 5.3
< 1
3.99
< 1
< 0.5
< 1
5.3
15.3
4.58
32.7
7.43
2.92
< 0.3
0.223
0.160
--
64
11/12/2018
2.16
7.4
< 5.0
< 1
1.92
< 1
< 0.05
< 1
4.66
7.22
3.83
12.9
3.79
< 1
< 0.2
< 0.2
0.107
< 0.40
39
1/29/2019
0.21
7.3
< 5.1
< 1
3.8
< 1
< 0.05
< 1
5.68
10.9
4.72
19.2
4.8
1.28
< 0.2
< 0.2
0.101
< 0.40
28
6/7/2019
0.58
7.0
< 5.0
< 1
2.95
< 1
0.069
< 1
2.04
10.4
1.87
15.6
2.15
1.44
< 0.2
1 < 0.2 1
0.098
--
16
2 of 5 www.duke-energy.com

October 2019
DUKE
ENERGY.
SUMMARY OF LABORATORY ANALYSES
INDUSTRIAL STORMWATER
MAY 2015 - JUNE 2019
NPDES Stormwater Permit NCS000548
Marshall Steam Station
y�
b
UNITS
pH
mg/L
ug/L
ug/L
ug/L
mg/L
ug/L
ug/L
ug/L
ug/L
ng/L
ug/L
ug/L
ug/L
ug/L
mg/1
mg/L
mg/L
STORMWATER
OUTFALL
PERMIT BENCI4MARK
VATEOF TOTAL
COLLECTION RAINFALL
12/14/2015 0.10
6-9
9.4
15
--
90
--
340
--
65
--
*
--
3
--
900
--
10
--
75
--
**
--
335
--
56
--
0.3
--
*
--
0.126
--
ANY
--
100
380
6/27/2016
0.98
7.2
-
--
--
-
--
160
9/1/2016
0.08
7.0
--
--
--
--
--
--
--
--
--
21
9/26/2016
0.76
7.2
--
--
--
--
--
--
17
12/29/2016
0.15
7.6
--
--
--
--
--
86
5WO08
6/22/2017
0.07
6.8
--
--
--
--
--
--
--
--
--
220
12/5/2017
0.34
8.2
--
--
--
62
6/25/2018
0.17
6.2
--
--
--
--
--
--
--
58
11/12/2018
2.16
8.2
--
--
-
--
--
--
--
110
1/29/2019
0.21
8.0
--
--
--
--
--
--
--
--
50
6/7/2019
0.58
8.2
--
24
3 of S www.duke-energy.com

October 2019
DUKE
ENERGY
SUMMARY OF LABORATORY ANALYSES
INDUSTRIAL STORMWATER
MAY 2015 - JUNE 2019
NPDES Stormwater Permit NCS000548
Marshall Steam Station
UNITS
PH
mg/L
ug/L
erg/L
ug/L
mg/L
ug/t
ug/L
ug/L
ug/L
ng/t
ug/L
ug%L
ug/L
ug/L
mg/L
I mg/L
mg/L
PERMIT BENCHMARK
6-9
25
90
340
65
"
3
900
10
75
**
335
56
0.3
*
0.126
ANY
100
STORM WA TER
OUTFALL
13A TF OF
COLLECTION
TOTAL
RAINFALL
12/17/2015
1A2
6.9
G 1
c 1
c 1
-
—
--
0.042
—
10
SW011
6/22/2017
0.07
7.2
< 1
2.D8
-
1.61
0.106
32
11/12/2018
2.16
7.0
-
< 1
¢ 1
--
c 1
-
-
0.088
16
12/14/2015
0.10
8.3
330
6/27/2016
0.98
6.3
200
9/1/2016
0.08
6.6
29
9/26/2016
0.76
7.0
16
12/29/2016
0.15
6.7
46
5WD12
6/22/2017
0.07
7.4
47
12/5/2017
0.34
7.1
31
6/25/2018
0.17
7-1
76
11/12/2018
2.16
7.2
-
72
6/7/2019
0.58
7.0
61
4 of 5 www.duke-energy.com

October 2019
,L DUKE
" ENERGY
SUMMARY OF LABORATORY ANALYSES
INDUSTRIAL STORMWATER
MAY 2015 - JUNE 2019
NPDES Stormwater Permit NCS000548
Marshall Steam Station
UNITS
pH
mg/L
ug/L
ug/L
ug/L
mg/L
ug/L
ug/L
ug/L
ug/L
ng/L
ug/L
ug/L
ug/L
ug/L
mg/L
mg/L
mg/L
PERMIT BENCHMARK
6-9
15
90
340
65
*
3
900
10
75
**
335
56
0.3
*
0.126
ANY
100
STORMWATER
OUTFALL
DATE OF
COLLECTION
TOTAL
RAINFALL
11/30/2015
0.82
7.5
--
--
-
--
-
-
-
--
-
--
-
--
-
-
7
6/27/2016
0.98
8.1
--
--
-
--
-
-
-
--
--
-
--
-
--
--
-
-
19
SWO12A
12/5/2017
0.34
7.2
--
--
-
--
--
-
--
-
--
-
-
-
--
-
--
--
61
11/12/2018
2.16
7.2
-
-
--
--
--
--
-
-
--
--
-
-
-
-
270
12/14/2015
0.10
9.5
-
--
-
-
-
-
-
-
-
-
-
160
6/27/2016
0.98
7.8
--
-
-
-
-
-
-
-
63
12/29/2016
0.15
6.9
-
-
_
-
-
--
-
< 5
SW022
6/22/2017
0.07
7.6
-
-
-
-
-
-
--
-
69
12/5/2017
0.34
7.5
-
-
--
-
-
-
-
-
-
--
--
29
6/25/2018
0.17
7.3
-
-
-
-
-
-
-
-
-
--
610
6/7/2019
0.58
7.5
-
-
-
-
-
-
-
-
-
-
--
-
9.8
notes:
* No Benchmark - Monitor Only
** No Benchmark - Values above NCDEQ standard of 12 ug/L should be noted but do not trigger Tier response
- Sample not analyzed for parameter
Outfalls SW001,1A, SW006,SW009 and SW023 have either been abandoned or are covered by the NPDES wastewater permit. Therefore their results are not included.
5 of 5 www.duke-energy.com

Attachment 3
Summary of Visual Monitoring Results

Site Contact: Scott LaSala
Phone Number: 828-478-7820
(' DUKE
ENERGY
SUMMARY OF VISUAL QUALITATIVE MONITORING DATA
MAY 2015 - JUNE 2019
NPDES Stormwater Permit NCS000548
Marshall Steam Station
STORMWATER OUTFALL
SWO02
SWO03
SWO04
SWO07
SWO08
SW011
SWO12
SWO12A
SWO22
Color
clear to
light brown
clear to
dark gray
clear to
gray
clear to
light gray
clear to
dark gray
clear to
light gray
clear to
light brown
clear to
light brown
clear to
light brown
Odor
None
None
None
None
None
None
None
None
None
Clarity (Average)
1.5
1.7
1.7
2.2
3.0
1.3
2.3
1.4
2.2
Floating Solids (Average)
1.1
1.1
1.0
1.3
1.9
1.0
1.4
1.4
1.5
Suspended Solids (Average)
1.2
1.6
1.0
1.8
2.2
1.0
1.8
1.2
1.9
Visible Foam
I None
None
None
None
None
None
None
None
None
Visible Oil Sheen
None
None
None
None
None
None
None
None
None
Indication of Erosion/Deposition
None
None
None
None
None
None
None
None
None
Rain Event Accumulation (Average)
0.7
0.7
1.4
0.5
0.5
1.1
0.5
1.1
0.4
Outfall Status
Active
Active
Active
Active
I Active
I Active
Active
Active
Active
Notes:
Value assessment of 1 - 5 for Clarity, Floating Solids, and Suspended Solids. Values increasing upward by severity (1 = Best Case and 5 = Worst Case)
Outfalls SW001, SW001A, SW006, SW009, and SW023 have been closed and are not included in this submittal.
SW024 was permitted but was never built.

Attachment 4
Summary of Best Management Practices

SDO Narrative Description and BMP Summary
Outfall ID: SWO02
Discharge Structure: 24" CMP
Location: Intake canal, south of
current boat ramp and
ash basin discharge
structure
Latitude - Longitude:
Drainage Area:
Percent Impervious:
Permit Monitoring
Table:
35°36'23", 80°57'35"
3.3 acres
0%
Table 1
4 DUKE
!! ENERGY.
Location: Marshall Steam Station
Permit No. NCS000548
Industrial Activities Outfall SWO02 includes mid -section of the vegetated slope of the ash basin
and Description: dike, gravel road and gravel storage yard area northeast of the Powerhouse.
This area includes the embankment slope between Outfall SWO01 and
Outfall SWO03 drainage areas. The embankment of the ash basin dike is
sloped at a ratio of two horizontal to one vertical (2H:1 V) and covers
approximately 80 percent of the drainage area.
The discharge from Outfall SWO02 flows down a rip rapped embankment
approximately 10 yards before reaching the intake canal.
The gravel laydown area is used for various quantities of construction
material such as structural steel, cable, truck trailers, various construction
equipment and personnel vehicle parking and other inert materials at various
times.
Significant Inert Materials: Various quantities of construction equipment,
Materials/Potential stockpiles of gravel or dirt, structural steel, cable,
Pollutants: truck trailers, and other inert materials may be
stored on the gravel storage area at various times.
BMP Summary: Fugitive Dust Emissions
• Establish procedures to minimize offsite tracking of dust.
Material Storage Areas
• Control leakage or spillage from vehicles or containers and ensure
that proper protective measurement.
• Cover material with a temporary covering made of polyethylene,
polyurethane, polypropylene, or hypalon.
• Provide diversion berms, dikes or grassed swales around the
perimeter of the area to limit run-on.
• Construct an enclosure or build a berm around the area.
• Regularly sweep area to minimize debris on the ground.
• Train employees in spill prevention, control, cleanup and proper
materials management techniques.

4� DUKE
ENERGY.
Location: Marshall Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000548
Outfall ID:
SWO03
Discharge Structure:
Ri rap -lined ditch
Location:
Intake canal, midway
along miscellaneous
material storage
area, east of ash
basin embankment
.'
Latitude - Longitude:
35036'11", 80057'67"
Drainage Area:
3.5 acres`
Percent Impervious:
o
Permit Monitoring
Table 1
I
Table:
Industrial Activities
and Description:
Outfall SWO03 includes southern most section of the gravel road and gravel
storage yard area northeast of the Powerhouse. The outfall drainage path is a
ditch that extends from the eastern edge of the gravel road to the intake canal.
The gravel laydown area is used for various quantities of construction material
such as structural steel, cable, truck trailers, various construction equipment
and personnel vehicle parking and other inert materials at various times.
Significant
Materials/Potential
Inert Materials: Various quantities of construction equipment,
Pollutants:
stockpiles of gravel or dirt, structural steel, cable,
truck trailers, and other inert materials may be
stored on the gravel storage area at various times.
BMP Summary:
Fugitive Dust Emissions
• Establish procedures to minimize offsite tracking of dust.
Material Storage Areas
• Control leakage or spillage from vehicles or containers and ensure
that proper protective measurement.
• Cover material with a temporary covering made of polyethylene,
polyurethane, polypropylene, or hypalon.
• Provide diversion berms, dikes or grassed swales around the
perimeter of the area to limit run-on.
• Construct an enclosure or build a berm around the area.
• Regularly sweep area to minimize debris on the ground.
• Train employees in spill prevention, control, cleanup and proper
materials management techniques.

SDO Narrative Description and BMP Summary
DUKE
ENERGY.
Location: Marshall Steam Station
Permit No. NCS000548
Outfall ID:
SWO04
Discharge Structure:
36" HDPE,
corrugated
4'. '
Location:
Intake canal, south
of old boat ramp
Latitude - Longitude:
35036'01
80°57'48"
_.
Drainage Area:
0.8 acres
J `
r�
Percent Impervious:
Permit Monitoring
Table 2^
Table:
Industrial Activities
and Description:
The drainage area for SWO04 comprises of the grass area on the ash basin
dike embankment slope southwest of the Ash Silos. The area is bordered on
the north by the top of the slope, east by the curbed ash haul road, west by
the above ground ash piping and bordered south by the paved plant road.
The drainage is collected in a riprap-lined catchment and piped under the
paved plant road to the outfall.
No activities typically occur in this area as it is bordered on all sides by
obstructions (roads, curbs, piping, etc.)
Significant
Materials/Potential
There are no significant materials or potential pollutants in this area.
Pollutants:
BMP Summary:
Provide diversion berms, dikes or grassed swales around the
perimeter of the area to limit run-on.

SDO Narrative Description and BMP Summary
Outfall ID:
SWO07
Discharge Structure:
60" CMP
Intake canal, main
Location:
powerhouse yard
drainage, across from
warehouse
Latitude - Longitude:
35°35'56", 80°57'51"
Drainage Area:
38.2 acres
Percent Impervious:
5%
V�DUKE
ENERGY
Location: Marshall Steam Station
Permit No. NCS000548
Permit Monitoring Table 4
Table:
Industrial Activities The drainage area for SWO07 comprises areas immediately north and
and Description: extending west of the Powerhouse. The drainage area includes the roofs of
the office annex, service building and the remaining portion of the
warehouse. The drainage area also includes 5 acres of paved Powerhouse
yard areas and parking lots, 4 miles of rail line, and a 3 acre graveled
switchyard. Roofed areas comprise approximately 35,000 square feet.
Vegetated embankments and outlying vegetated areas west of the
Powerhouse comprise most of the SWO07 drainage area.
Located within the SWO07 drainage area is approximately 50 drums of lube
oil, and small containers of hydrazine, glycerin and 2-propanol, stored inside
the warehouse. Approximately 1,400 linear feet of the covered FGD
limestone and gypsum conveyors cross through the SWO07 drainage area.
Drainage Area SWO07 includes small transformers containing mineral oil
located in the 3 acre graveled switchyard.
On rare occasions, the stormwater discharge from SWO07 is comingled with
the NPDES permitted overflow from Sump #1 (NPDES Outfall 002A).
Outfall SWO07 discharges directly into the intake canal.
Significant Oil: Transformers containing a total of 340 gallons of
Materials/Potential
Pollutants: mineral oil are located in the switchyard.
Approximately 50 drums of lube oil are stored
inside the Warehouse. Drum deliveries are made
at the Warehouse. These drums are not routinely
exposed to stormwater.
Gypsum and Limestone: Approximately 1,400 feet of the covered FGD
limestone and gypsum conveyors cross through
the SWO07 drainage area.
Chemicals: Small containers of hydrazine, glycerin and 2-
propanol are stored inside the Warehouse. These
containers are not routinely exposed to
stormwater.

SDO Narrative Description and BMP Summary
& DUKE
ENERGY.
Location: Marshall Steam Station
Permit No. NCS000548
BMP Summary: Fugitive Dust Emissions
• Establish procedures to minimize offsite tracking of dust.
• Wash vehicles before they leave the site in a designated area where
wash water can be controlled.
Delivery Vehicles:
• Develop procedure for the inspection of all vehicles arriving on the
plant site and ensure overall integrity of the body or container.
• Control leakage or spillage from vehicles or containers and ensure
that proper protective measurement.
Chemical Loading/Unloading Areas
• Cover chemical loading/unloading areas and store chemicals
indoors, when possible.
• Provide diversion berms, dikes or grassed swales around the
perimeter of the area to limit run-on.
• Use containment curbs at chemical loading/unloading areas.
• Develop and implement spill prevention, containment, and
countermeasure (SPCC) plans.
• Train employees in spill prevention, control and cleanup.
• Personnel familiar with spill prevention and response procedures
should be present during unloading to ensure that any leaks or spills
are immediately contained and cleaned up.
Miscellaneous Loading/Unloading
• Confine loading/unloading activities to designated areas outside
drainage pathways and away from surface waters.
• Inspect containers for leaks or damage prior to loading/unloading.
• Avoid loading/unloading materials in the rain or provide cover or
other protection for loading docks.
• Provide diversion berms, dikes or grassed swales around the
perimeter of the area to limit run-on.
• Cover loading and unloading areas and perform these activities on
an impervious pad to enable easy collection of spilled materials.
• Slope the impervious concrete floor or pad to collect spills and leaks
and convey them to proper containment and treatment.
• Regularly sweep area to minimize debris on the ground.
Oil Bearing Equipment/Switchyards
• Construct level grades and gravel surfaces to retard flows and limit
the spread of spills.
• Collect stormwater runoff in perimeter ditches.
Vehicle and Equipment Maintenance
Good Housekeeping
• Eliminate floor drains that are connected to the storm or sanitary
sewer; if necessary, install a sump that is pumped regularly.
Collected wastes should be properly treated or disposed of by a
licensed waste hauler.
• Do all cleaning at a centralized station so the solvents stay in one
area.

DUKE
!T' ENERGY.
SDO Narrative Description and BMP Summary
Location: Marshall Steam Station
Permit No. NCS000548
• Use drip pans, drain boards, and drying racks to direct drips back
into a fluid holding tank for reuse.
• Drain all parts of fluids prior to disposal. Oil filters can be crushed
and recycled.
• Promptly transfer used fluids to the proper container; do not leave
full drip pans or other open containers around the shop. Empty and
clean drip pans and containers.
• Clean up leaks, drips, and other spills without using large amounts
of water. Use absorbents for dry cleanup whenever possible.
• Do not pour liquid waste into floor drains, sinks, outdoor storm drain
inlets, or other storm drains or sewer connections.
• Maintain an organized inventory of materials.
• Eliminate or reduce the number and amount of hazardous materials
and waste by substituting nonhazardous or less hazardous
materials.
• Label and track the recycling of waste material (e.g., used oil, spent
solvents, batteries).
• Store batteries and other significant materials inside.
• Dispose of greasy rags, oil filters, air filters, batteries, spent coolant,
and degreasers in compliance with RCRA regulations.
Minimizing Exposure
• Perform all cleaning operations indoors or under covering when
possible. Conduct the cleaning operations in an area with a concrete
floor with no floor drainage other than to sanitary sewers or
treatment facilities.
• If operations are uncovered, perform them on a concrete pad that is
impervious and contained.
• Check vehicles closely for leaks and use pans to collect fluid when
leaks occur.
Management of Runoff
• Use berms, curbs, or grassed swales other diversion measures to
ensure that stormwater runoff from other parts of the facility does not
flow over the maintenance area.
Inspections and Training
• Inspect the maintenance area regularly to ensure BMPs are
implemented.
• Train employees on waste control and disposal procedures.

DUKE
ENERGY.
SDO Narrative Description and BMP Summary
Location: Marshall Steam Station
Permit No. NCS000548
Outfall ID:
SW 008
Discharge Structure:
8" CMP
Location:
Intake canal, north
side of intake structure
-
Latitude - Longitude:
35035'53", 80057'50"
Drainage Area:
0.1 acres
Percent Impervious:
70%
Permit Monitoring
Table 5
Table:
Industrial Activities
The SW008 drainage area is comprised primarily of paved roadway and
and Description:
yard area on the east side of the Powerhouse. Approximately 70 percent of
this area is paved with a small vegetated area located immediately adjacent
to the intake canal. SW008 discharges into a vegetated strip and then flows
into the intake canal.
Significant
None
Materials/Potential
Pollutants:
BMP Summary:
• Regularly sweep area to minimize debris on the ground.

SDO Narrative Description and BMP Summary
Outfall ID:
Discharge Structure:
Location:
I Latitude - Longitude:
1
f Drainage Area:
Percent Impervious:
Permit Monitoring
Table:
Industrial Activities
and Description:
Significant
Materials/Potential
Pollutants:
BMP Summary:
SW011
24" CMP
South bank of
discharge canal, south
of discharge structure
35035'43", 80057'52"
5.4 acres
5%
Table 7
+<� DUKE
'C ENERGY.
Location: Marshall Steam Station
Permit No. NCS000548
The drainage area includes the plant entrance from Hwy 150, the area
surrounding the plant raw water storage tank on the west side of the plant
entrance road, the majority of the entrance and exit drives of the fuel
unloading area and a vegetated area southwest of and connecting to the
discharge canal. Approximately 150 feet of the covered FGD limestone and
gypsum conveyors crosses through the drainage area.
Gypsum and Limestone: Approximately 150 linear feet of the covered FGD
limestone and gypsum conveyors cross through
the SW011 drainage area.
Fugitive Dust Emissions
• Establish procedures to minimize offsite tracking of dust.

�� DUKE
ENERGY.
SDO Narrative Description and BMP Summary
Location: Marshall Steam Station
Permit No. NCS000548
Outfall ID:
I SW 012
Discharge Structure:
1 18" HDPE
Location:
Southern end of intake
canal
Latitude - Longitude:
35°35'50", 80-57-47"
Drainage Area:
2.0 acres
Zr.
Percent Impervious:
10%
Permit Monitoring
Table 8
Table:
Industrial Activities
and Description:
The SW012 drainage area is comprised of graveled yard,articulated
concrete block areas, and vegetated slopes located north and west of the
FGD facility (east of the Powerhouse) near the scrubber vicinity. The FGD
facility ductwork crosses over the southern end of the drainage area.
Significant
Materials/Potential
Inert Materials: Various quantities of construction materials
Pollutants:
including valves, piping and other inert materials
may be stored on the gravel storage area north of
the FGD at various times.
BMP Summary:
Fugitive Dust Emissions
• Establish procedures to minimize offsite tracking of dust.
Material Storage Areas
• Control leakage or spillage from vehicles or containers and ensure
that proper protective measurement.
• Cover material with a temporary covering made of polyethylene,
polyurethane, polypropylene, or hypalon.
• Provide diversion berms, dikes or grassed swales around the
perimeter of the area to limit run-on.
• Construct an enclosure or build a berm around the area.
• Regularly sweep area to minimize debris on the ground.
• Train employees in spill prevention, control, cleanup and proper
materials management techniques.

DUKE
ENERGY.
Location: Marshall Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000548
Outfall ID:
SW 012A
:>
Discharge Structure:
Open ditch_
Location:
Intake canal, lower
terrace of old FGD
construction area
Latitude - Longitude:
35035'57", 80057'44"
Drainage Area:
1.0 acres
Percent Impervious:
0 %
Permit Monitoring
Table 8
Table:
Industrial Activities The SW012A drainage area is comprised of vegetated slopes and lowland
and Description: area on the north side of the FGD facility. In the lowland area adjacent to
the intake canal there is an abandoned erosion protection and sediment
control measure. This sediment basin was originally used during the FGD
construction. The lower berm has been removed and the area has been
allowed uncontrolled vegetation growth. The area contains trees and other
woody vegetation.
Significant Inert Materials: Various quantities of construction materials
Materials/Potential including valves, piping and other inert materials
Pollutants: may be stored on the gravel storage area north of
the FGD at various times.
BMP Summary: Fugitive Dust Emissions I
• Establish procedures to minimize offsite tracking of dust. f
Material Storage Areas
• Control leakage or spillage from vehicles or containers and ensure
that proper protective measurement.
• Cover material with a temporary covering made of polyethylene,
polyurethane, polypropylene, or hypalon.
• Provide diversion berms, dikes or grassed swales around the
perimeter of the area to limit run-on.
• Construct an enclosure or build a berm around the area.
• Regularly sweep area to minimize debris on the ground.
• Train employees in spill prevention, control, cleanup and proper
materials management techniques.

SDO Narrative Description and BMP Summary
Outfall ID:
Discharge Structure
Location:
Latitude - Longitude:
Drainage Area:
Percent Impervious:
Permit Monitoring
Table:
Industrial Activities
and Description:
Significant
Materials/Potential
Pollutants:
BMP Summary:
SW 022
18" HDPE
North bank of
discharge canal
35035'44", 80057'52"
0.8 acres
0%
Table 9
The SW022 drainage area is comprised of a portion of the paved FGD
facility access road, paved road ditch, gravel laydown and vegetated /
wooded embankment slopes.
KE
ENERGY
Location: Marshall Steam Station
Permit No. NCS000548
None.
Fugitive Dust Emissions
• Establish procedures to minimize offsite tracking of dust.
Delivery Vehicles
• Wash vehicles before they leave the site in a designated area where
wash water can be controlled.
• Develop procedure for the inspection of all vehicles arriving on the
plant site and ensure overall integrity of the body or container.

SDO Narrative Description and BMP Summary
Outfall ID:
Discharge Structure:
Location:
Latitude - Longitude:
Drainage Area:
Percent Impervious:
Permit Monitoring
Table:
Industrial Activities
and Description:
Significant
Materials/Potential
Pollutants:
BMP Summary:
SW 025
2 — 24" HDPE
Upgradient of drainage
35035'44", 80057'52"
i
222.6 acres I? _ -
DUKE
ENERGY.
Location: Marshall Steam Station
Permit No. NCS000548
zWa
0%
N/A / New Outfall
The SW025 drainage area is comprised of offsite drainage into the site from
the southwest and industrial stormwater from the structural fill / landfill
collection area. These flow are collected within an onsite pond north of the
ash basin / decanting area and pumped north and east to the drainage area
pond, which is riprapped and through the outfall.
Inert Materials: Various quantities of construction equipment,
stockpiles of gravel or dirt, truck trailers, and other
inert materials may be stored on the gravel
storage area at various times. Sediment from
various construction activities upgradient of
drainage area.
Sediment
• Riprap lined pond for sump / settling
Fugitive Dust Emissions
• Establish procedures to minimize offsite tracking of dust.
Material Storage Areas
• Control leakage or spillage from vehicles or containers and ensure
that proper protective measurement.
• Cover material with a temporary covering made of polyethylene,
polyurethane, polypropylene, or hypalon.
• Provide diversion berms, dikes or grassed swales around the
perimeter of the area to limit run-on.
• Construct an enclosure or build a berm around the area.
• Regularly sweep area to minimize debris on the ground.
• Train employees in spill prevention, control, cleanup and proper
materials management techniques.

Attachment 5
Narrative of Significant Changes at Marshall Steam Station

Marshall Steam Station
Industrial Activity Changes
The most significant changes at the site since the issuance of permit NCS000548 on May 15, 2015
include the following:
• Designation of the Constructed Wetland Treatment System is now inactive
• Addition of drainage area and SDO SW025 in the northern portion of the site to the permit
• The following SDOs are now abandoned or permitted under the wastewater NPDES permit:
SW001, SW001A, SW006, SW009 and SW023. SW024 was permitted but never installed and
now does not plan to be installed.
• Update of the drainage area description for SW012
• Addition of the Lined Retention Basin (LRB) and holding basin on the Appendix C — Site Map in
place of the former borrow soil area
• Significant drainage at the station now being collected and sent to the Lined Retention Basin
versus the ash basin.

Attachment 6
Certification of Development and Implementation of
Stormwater Pollution Prevention Plan

STORMWATER POLLUTION PREVENTION PLAN
DEVELOPMENT AND IMPLEMENTATION
CERTIFICATION
North Carolina Division of Energy, Mineral, and Land Resources - Stormwater Permitting
Facility Name:
Permit Number:
Location Address:
Marshall Steam Station
_NCS000548
8329 East NC Hwy 150
County: Cata
"I certify, under penalty of law, that the Stormwater Pollution Prevention Plan (SPPP) document and all
attachments were developed and implemented under my direction or supervision in accordance with a system
designed to assure that qualified personnel properly gather and evaluate the information required by the SPPP.
Based on my inquiry of the person or persons who manage the system, or those persons directly responsible
for gathering the information, the information gathered is, to the best of my knowledge and belief, true,
accurate and complete."
rurff %I
"I certify that the SPPP has been developed, signed and retained at the named facility location, and the SPPP
has been fully implemented at this facility location in accordance with the terms and conditions of the
stormwater discharge permit."
And
"I am aware that there are significant penalties for falsifying information, including the possibility of fines and
imprisonment for knowing violations."
Sign (according to permit signatory requirements) and return this Certification. DO NOT
SEND STORMWATER POLLUTION PREVENTION PLAN WITH THIS CERTIFICATION.
Signature
Print or type name of person signing above
October 24, 2019
Date
General Manager III
Title
SPPP Certification 10/13

Attachment 7
Fish Tissue Sampling Results

Table 1. Arsenic, selenium, and mercury concentrations (fresh weight) in axial muscle of fish from Lake
Norman during 2015-20171.
Dry -to -
fresh
Length
Weight
As
Se
Hg
weight
Fish species
Location
Sample date
(mm)
(g)
W/O
W/O
W/O
ratio
Redear Sunfish
UP
April 2014
241
245
0.06
0.56
<0.06
0.208
Redear Sunfish
UP
April 2014
258
311
0.08
0.50
<0.05
0.199
Redear Sunfish
UP
April 2014
243
276
0.10
0.56
<0.05
0.201
Redear Sunfish
UP
April 2014
234
222
0.04
0.58
<0.06
0.208
Redear Sunfish
UP
April 2014
220
176
0.08
0.82
<0.06
0.209
Redear Sunfish
UP
April 2014
240
254
0.11
0.53
<0.06
0.211
Alabama Bass
UP
April 2014
350
564
0.19
0.39
<0.06
0.207
Alabama Bass
UP
April 2014
355
522
0.23
0.37
<0.06
0.208
Alabama Bass
UP
April 2014
378
590
0.10
0.40
<0.05
0.201
Alabama Bass
UP
April 2014
340
512
0.22
0.40
<0.06
0.224
Alabama Bass
UP
April 2014
380
611
0.16
0.47
<0.05
0.198
Alabama Bass
UP
April 2014
358
523
0.06
0.39
<0.06
0.205
Redear Sunfish
DI
April 2014
254
202
0.11
0.78
<0.05
0.181
Redear Sunfish
DI
April 2014
271
345
0.10
0.64
<0.06
0.207
Redear Sunfish
DI
April 2014
172
82
0.10
0.64
<0.05
0.193
Redear Sunfish
DI
April 2014
275
380
0.08
0.66
<0.05
0.200
Redear Sunfish
DI
April 2014
186
107
0.10
0.58
<0.06
0.208
Redear Sunfish
DI
April 2014
185
94
0.10
0.62
<0.06
0.208
Alabama Bass
DI
April 2014
380
668
0.15
0.62
<0.06
0.215
Alabama Bass
DI
April 2014
392
692
0.19
0.43
<0.06
0.215
Alabama Bass
DI
April 2014
424
972
0.11
0.53
0.09
0.213
Alabama Bass
DI
April 2014
338
458
0.13
0.44
<0.06
0.211
Alabama Bass
DI
April 2014
393
702
0.08
0.44
0.13
0.210
Alabama Bass
DI
April 2014
435
1136
0.08
0.74
0.21
0.212
Redear Sunfish
DN
April 2014
268
340
0.06
0.77
<0.06
0.209
Redear Sunfish
DN
April 2014
261
288
0.10
0.83
<0.05
0.202
Redear Sunfish
DN
April 2014
195
109
0.04
0.37
<0.03
0.098
Redear Sunfish
DN
April 2014
186
100
0.06
0.82
<0.06
0.206
Redear Sunfish
DN
April 2014
177
89
0.04
0.80
<0.06
0.204
Redear Sunfish
DN
April 2014
195
118
0.04
0.71
<0.06
0.210
Alabama Bass
DN
April 2014
429
890
0.08
0.68
<0.05
0.201
Alabama Bass
DN
April 2014
404
696
0.08
0.66
<0.05
0.199
Alabama Bass
DN
April 2014
367
546
0.08
0.56
<0.06
0.206
Alabama Bass
DN
April 2014
416
864
<0.04
0.57
<0.05
0.185
Alabama Bass
DN
April 2014
359
602
0.16
0.57
<0.05
0.203
Alabama Bass
DN
April 2014
361
562
0.10
0.56
<0.06
0.208
Redbreast Sunfish
UP
April 2015
251
261
0.06
0.31
<0.06
0.204
Redbreast Sunfish
UP
April 2015
227
200
0.07
0.35
0.09
0.197
Redbreast Sunfish
UP
April 2015
259
306
0.06
0.28
0.09
0.183
Redbreast Sunfish
UP
Apri12015
247
186
0.06
0.34
0.24
0.167
Redbreast Sunfish
UP
April 2015
231
190
<0.04
0.24
0.09
0.198
Redbreast Sunfish
UP
April 2015
238
213
0.04
0.33
0.11
0.190
1 Fish were collected for trace elemental analyses during April 2018 and March and April 2019, however these
results are not yet available.
1

Dry -to -
fresh
Length
Weight
As
Se
Hg
weight
Fish species
Location
Sample date
(mm)
(g)
(µg/g)
(µg/g)
(µg/g)
ratio
Alabama Bass
UP
April 2015
448
1110
0.07
0.25
0.28
0.179
Alabama Bass
UP
April 2015
410
780
0.05
0.36
0.31
0.211
Alabama Bass
UP
April 2015
430
831
0.05
0.18
0.13
0.172
Alabama Bass
UP
April 2015
417
924
0.07
0.35
0.27
0.196
Alabama Bass
UP
April 2015
372
773
0.05
0.21
0.19
0.172
Alabama Bass
UP
April 2015
457
1224
0.04
0.33
0.30
0.191
Alabama Bass
DI
March 2015
462
1242
<0.04
0.39
0.26
0.193
Alabama Bass
DI
March 2015
458
1342
<0.04
0.48
0.35
0.186
Largemouth Bass
DI
March 2015
447
1152
0.05
0.34
0.25
0.186
Largemouth Bass
DI
March 2015
475
1575
0.08
0.52
0.32
0.188
Largemouth Bass
DI
March 2015
490
1788
0.08
0.34
0.26
0.179
Alabama Bass
DI
March 2015
438
1106
0.06
0.31
0.23
0.198
Redear Sunfish
DI
April 2015
218
160
0.21
0.56
0.11
0.202
Redear Sunfish
DI
April 2015
215
171
0.21
0.71
0.08
0.212
Redear Sunfish
DI
April 2015
252
248
0.17
0.73
0.16
0.182
Redear Sunfish
DI
April 2015
280
352
<0.04
0.60
0.18
0.192
Redear Sunfish
DI
April 2015
257
296
0.10
0.59
0.15
0.185
Bluegill
DI
April 2015
210
173
<0.04
0.37
0.17
0.183
Alabama Bass
DN
April 2015
330
430
<0.04
0.36
0.17
0.198
Alabama Bass
DN
April 2015
385
685
0.09
0.27
0.20
0.195
Alabama Bass
DN
April 2015
360
545
0.05
0.38
0.18
0.189
Alabama Bass
DN
April 2015
400
730
0.05
0.38
0.17
0.182
Alabama Bass
DN
April 2015
375
604
0.05
0.36
0.19
0.187
Alabama Bass
DN
April 2015
350
479
0.08
0.29
0.27
0.193
Redear Sunfish
DN
April 2015
250
278
0.07
0.50
0.13
0.193
Bluegill
DN
April 2015
187
125
<0.04
0.39
0.16
0.190
Redear Sunfish
DN
April 2015
194
109
0.18
0.51
0.12
0.181
Redear Sunfish
DN
April 2015
185
99
0.06
0.51
0.11
0.191
Bluegill
DN
April 2015
194
150
0.17
0.34
0.09
0.196
Bluegill
DN
April 2015
202
167
0.21
0.27
0.13
0.208
Bluegill
UP
April 2016
170
79
0.04
0.23
0.15
0.189
Bluegill
UP
April 2016
166
84
<0.04
0.17
0.14
0.191
Bluegill
UP
April 2016
163
80
<0.04
0.21
0.09
0.188
Bluegill
UP
Apri12016
177
98
<0.04
0.22
0.07
0.191
Bluegill
UP
April 2016
158
68
<0.04
0.19
0.10
0.184
Bluegill
UP
April 2016
156
67
<0.04
0.22
<0.05
0.192
Alabama Bass
UP
Apri12016
440
998
<0.04
0.22
0.28
0.179
Alabama Bass
UP
April 2016
316
349
0.09
0.20
<0.06
0.210
Alabama Bass
UP
April 2016
405
788
0.13
0.19
0.10
0.188
Alabama Bass
UP
Apri12016
315
272
0.13
0.19
0.11
0.196
Alabama Bass
UP
April 2016
315
375
0.08
0.19
0.12
0.205
Alabama Bass
UP
April 2016
400
656
0.10
0.22
0.26
0.179
Bluegill
DI
Apri12016
194
135
<0.04
0.46
0.14
0.200
Bluegill
DI
Apri12016
180
103
<0.04
0.45
0.11
0.195
Bluegill
DI
April 2016
163
81
<0.04
0.38
0.09
0.194
Bluegill
DI
Apri12016
172
84
0.10
0.31
0.17
0.189
Bluegill
DI
Apri12016
156
69
<0.04
0.32
<0.05
0.198
Bluegill
DI
April 2016
162
68
0.06
0.34
0.11
0.188
Alabama Bass
DI
April 2016
410
616
0.04
0.52
0.35
0.172
2

Dry -to -
fresh
Length
Weight
As
Se
Hg
weight
Fish species
Location
Sample date
(mm)
(g)
(µg/g)
(µg/g)
(µg/g)
ratio
Alabama Bass
DI
April 2016
404
764
0.10
0.35
0.22
0.194
Alabama Bass
DI
April 2016
474
1156
<0.04
0.41
0.28
0.178
Alabama Bass
DI
April 2016
384
640
0.13
0.27
0.14
0.207
Alabama Bass
DI
April 2016
4S5
993
0.05
0.39
0.29
0.180
Alabama Bass
DI
April 2016
450
1125
0.09
0.31
0.25
0.204
Green Sunfish
DN
November 2016
166
80
<0.04
0.32
0.07
0.178
Bluegill
DN
November 2016
166
77
<0.04
0.32
0.08
0.187
Redbreast Sunfish
DN
November 2016
164
62
<0.04
0.37
0.06
0.200
Bluegill
DN
November2016
151
51
<0.04
0.38
<0.05
0.182
Green Sunfish
DN
November 2016
175
ill
<0.04
0.32
0.10
0.188
Redbreast Sunfish
DN
November 2016
151
52
<0.04
0.36
0.09
0.189
Alabama Bass
DN
November 2016
241
127
0.06
0.40
0.13
0.208
Alabama Bass
DN
November 2016
270
210
0.04
0.41
0.12
0.216
Alabama Bass
DN
November 2016
312
319
<0.04
0.37
0.07
0.207
Alabama Bass
DN
November 2016
276
228
<0.04
0.47
0.07
0.206
Largemouth Bass
DN
November 2016
284
242
0.07
0.49
0.14
0.212
Largemouth Bass
DN
November 2016
239
138
0.07
0.45
0.12
0.204
Redear Sunfish
UP
March 2017
252
266
<0.04
0.30
<0.05
0.199
Redear Sunfish
UP
March 2017
272
335
<0.04
0.26
<0.06
0.206
Redear Sunfish
UP
March 2017
227
205
<0.04
0.24
<0.06
0.213
Redear Sunfish
UP
March 2017
225
194
<0.04
0.24
<0.06
0.213
Redear Sunfish
UP
March 2017
263
342
<0.04
0.35
<0.06
0.211
Redear Sunfish
UP
March 2017
277
394
<0.04
0.34
0.07
0.206
Alabama Bass
UP
March 2017
395
670
<0.04
0.19
0.27
0.207
Alabama Bass
UP
March 2017
390
660
<0.04
0.18
0.16
0.193
Alabama Bass
UP
March 2017
367
547
<0.04
0.23
0.12
0.215
Alabama Bass
UP
March 2017
445
1050
<0.04
0.24
0.21
0.201
Alabama Bass
UP
March 2017
353
467
<0.04
0.19
0.15
0.208
Alabama Bass
UP
March 2017
396
776
<0.04
0.24
0.06
0.212
Redear Sunfish
DI
March 2017
194
105
<0.04
0.64
<0.06
0.211
Bluegill
DI
March 2017
181
96
<0.04
0.38
<0.05
0.197
Alabama Bass
DI
March 2017
362
544
<0.04
0.32
0.10
0.196
Alabama Bass
DI
March 2017
355
537
<0.04
0.26
0.16
0.202
Alabama Bass
DI
March 2017
334
380
<0.04
0.35
0.07
0.206
Alabama Bass
DI
March 2017
395
700
<0.04
0.31
0.20
0.198
Alabama Bass
DI
March 2017
361
566
<0.04
0.36
0.13
0.202
Alabama Bass
DI
March 2017
328
380
<0.04
0.37
0.09
0.216
Redear Sunfish
DI
October 2017
178
91
<0.04
0.61
<0.06
0.207
Redbreast Sunfish
DI
October 2017
182
91
<0.04
0.48
0.14
0.209
Redbreast Sunfish
DI
October 2017
180
94
<0.04
0.46
<0.05
0.182
Redbreast Sunfish
DI
October 2017
181
105
<0.04
0.51
<0.06
0.211
Alabama Bass
DN
March 2017
350
485
<0.04
0.38
0.08
0.201
Alabama Bass
DN
March 2017
362
563
<0.04
0.37
<0.06
0.212
Alabama Bass
DN
March 2017
397
739
<0.04
0.41
<0.06
0.209
Alabama Bass
DN
March 2017
385
729
<0.04
0.48
<0.06
0.210
Alabama Bass
DN
March 2017
336
440
<0.04
0.45
0.14
0.207
Alabama Bass
DN
March 2017
354
560
<0.04
0.33
0.16
0.216
Redear Sunfish
DN
October 2017
210
146
<0.04
0.81
<0.06
0.207
Redear Sunfish
DN
October 2017
219
177
<0.04
0.78
0.06
0.212
3

Dry -to -
fresh
Length
Weight
As
Se
Hg
weight
Fish species Location Sample date (mm)
(g)
W/O
(µg/g)
W/O
ratio
Redear Sunfish DN October 2017 222
174
<0.04
0.83
<0.06
0.204
Redear Sunfish DN October 2017 204
128
<0.04
0.72
<0.05
0.202
Redbreast Sunfish DN October 2017 186 120 <0.04 0.56 <0.05 0.191
Redear Sunfish DN December 2017 -- -- <0.04 0.92 0.09 0.208

Figure 1. Sampling areas for trace element fish tissue monitoring in Lake Norman.

COGS DUKE Marshall Steam Station
8320 East NC Hwy 150
E ENERGY, Terrell, NC 28682
828.478.7700
July 8, 2020
North Carolina Dept. of Environmental Quality
Attention: Annette Lucas
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Duke Energy Carolinas, LLC.
New Industrial Stormwater Outfall
Marshall Steam Station (NCS000548) - Catawba County
Dear Ms. Lucas:
Duke Energy plans to add a new industrial stormwater outfall (SW026) at Marshall
Steam Station in order to redirect approximately 200 acres of drainage area from
entering the ash basin. This new outfall is necessary to re-route stormwater away from
the ash basin and to assist in the closure of the ash basin. SW026 will discharge to a
cove of Lake Norman northeast of the ash basin. The stormwater will be re-routed by
clean closing portions of the ash basin and backfilling with soil to establish grades to
construct a stormwater diversion channel and lined stormwater pond. The diversion
channel will be partially grass lined and partially riprap lined. The stormwater pond will
be lined with a 40-mil linear low -density polyethylene geomembrane. The discharge
pipe will be a 48-inch diameter reinforced concrete pipe with a reinforced concrete
energy dissipator structure at the proposed outfall. Attached is a figure that shows the
drainage area for this outfall. It is requested that this outfall be included in stormwater
permit NCS000548 as it is currently being renewed.
If you have questions or need additional information, please contact Robert Wylie at
[phone].
Sincerely,
itr
General Manager III
Marshall Steam Station
cc: Bethany Georgoulias - Via Email
Zahid Khan - Via Email
Attachment: Figure of SW026 Drainage Area

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- IIIIIIm IIIIIIIm IIIIIIIm IIIIIIm IIIIIIM I_ IIIIIIIN IIIIIIIN IIIIIIIN -
REV. p
LEGEND_
PROPOSED MAJOR TOPOGRAPHIC CONTOUR
PROPOSED MINOR TOPOGRAPHIC CONTOUR
PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY (APPROXIMATE)
EXISTING SITE FEATURE BOUNDARY (APPROXIMATE)
DRAINAGE AREA BOUNDARY
PROPOSED MAR-152 STORMWATER DISCHARGE PIPE
NOTES_
1. DURING LANDFILL OPERATIONS, CONTACT WATER IN THE EXPOSED
CCR WORKING FACE IS CONTAINED AND CONVEYED TO THE
LEACHATE COLLECTION SYSTEM AND LINED RETENTION BASIN
(NPDES NC0004987) WHILE STORMWATER ON SOIL COVERED AND
VEGETATED SIDE SLOPES WILL BE CONVEYED TO THE PROPOSED
STORMWATER OUTFALL.
L=COM
N MAR-152 DRAINAGE MAP
MARSHALL STEAM STATION
CLOSURE BY EXCAVATION CLOSURE PLAN
CATAWBA COUNTY, NORTH CAROLINA
FOR ISSUED FOR APPROVAL
SCALE: AS SHOWN
GDUKEDWG TYPE:
.DWG
JOB NO: 60572849
ENERGY
.�, DATE: 06/17/2020
FILENAME: MAR-152 Drainage Map.dwg
0 500 1000 1500 DWG SIZE DRAWING NO.
ANSI D FIGURE 1
GRAPHIC SCALE (IN FEET) 22.0"x34.0"
7 8
DES: JW
DFTR:
MW
CHKD: RJB
ENGR:
RJ B
APPD: JB
REVISION
A
A —I
C-1
M