NCS000549_Renewal Application Complete_20200427

4' DUKE
ENERGY
Suzanne McCoy
NCDEMLR Stormwater Program
1612 Mail Service Center
Raleigh, North Carolina 27699-1612
DENR•LAND QUALITY
STORIA",rATER PERMITTING
Subject: Duke Energy Carolinas, LLC
Riverbend Steam Station
Industrial Storm Water PermitIINCS000549
Gaston County
Dear Ms. McCoy:
Duke Energy 526 South
Church Street Charlotte,
NC 28202
Mailing Address:
Mall Code EC13K/ P.O. Box 1006
Charlotte, NC 28201-1006
AVdJ02fd ONINIIN
Z GNVI
DIN P z aav
NCDEQ staff have recently requested that Duke Energy Carolinas, LLC (Duke Energy) submit a permit
renewal application for the Riverbend NPDES Stormwater Permit number NCS000549, to maintain the
permit while the agency finishes review of the permit rescission request and no exposure certification
submitted for the site on October 21, 2019 and October 7, 2019 respectively.
As indicated in our previous submittals, there is no industrial activity at the site that would require
continuing NPDES stormwater permit coverage. Steam electric energy generation and ash excavation and
transport have been completed and have permanently ceased at the site. Duke Energy requests both the
No Exposure certification for the Lark maintenance facility and Rescission or expiration of the subject
permit be completed as previously requested.
In response to the agency's request however, Duke Energy attaches a:
1. Renewal Application Form,
2. SPPP Certification Form,
3. Map of site drainage areas,
4. Analytical and Visual Summary Spreadsheets and
5. Drainage area Descriptions.
If you have questions or need additional information, please contact Brad Loveland at
[phone] or [e-mail].
"I certify, under penalty of law, that this document and all attachments were prepared under
my direction or supervision in accordance with a system designed to assure that qualified
personnel properly gather and evaluate the information submitted. Based on my inquiry of
the person or persons who manage the system, or those persons directly responsible for
gathering the information, the information submitted is, to the best of my knowledge and
belief, true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fines and imprisonment for knowing
violations."
Sincerely�'v'
Tim Hill
General Manager, CCP Regional Operations & Maintenance

Permit Coverage
1C.
Renewal ADDlication Form
National Pollutant Discharge Elimination System NPDES Permit Number
f uir�nn,rafof
Stormwater Individual Permit NCS 000549
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 wi//be mailed
Owner / Organization Name:
Duke energy Carolinas
Owner Contact:
-Fm Hill
Mailing Address:
Charlotte, NC 28201-1006
Charlotte, NC 28201-1006
Phone Number:
980373.6166
Fax Number:
E-mail address:
[e-mail]
Facility Information
Facility Name:
RivelaendStation
Facility Physical Address:
175 Steam Plant Rd
Mount Holly NC 28120
Facility Contact:
Brandon Garrison
Mailing Address:
115 Steam Plant Rd
Mount Holly NC 26120
Phone Number:
7042633325
Fax Number:
E-mail address:
[e-mail]
Permit Information
Permit Contact:
Same as owner
Mailing Address:
Phone Number:
Fax Number:
E-mail address:
Discharge Information
Receiving Stream:
Catawba River (Mountain Island Lake)
Stream Class:
class WSW, B
Basin:
CA stream in the Catawba River Basin
Sub -Basin:
Number of Outfalls:
7
Facility/Activity Changes Please describe below any changes to your facility or activities since issuance of your permit. Attached a
separate sheet if necessary.
Rivemend station Demo was completed May 2018. Ash transport ceased from rail on March 2018.
No Industrial activity is occudng in the drainage areas of the existing seven outralls.
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 is true, complete accurate.
Signature / �/ Date Y- a0 -10
j l.H lyrLL �wtia! /�Af✓itlr7t CGP GPS
Print or type name of person signing above Title
Please return this completed application form DEMLR - Stormwater Program
Dept. of Environmental Quality
and requested supplemental information to:
1612 Mail Service Center
Raleigh, North Carolina 27699-1612

STORMWATER POLLUTION PREVENTION PLAN
DEVELOPMENT AND IMPLEMENTATION
CERTIFICATION
North Carolina Division of Energy, Mineral, and Land Resources — Stormwater Program
Facility Name:
Permit Number:
Location Address:
County:
Riverbend Station
175 Steam Plant Rd
Mount Holly NC
"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."
P_Rel
" 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
.1M (Yi LL
Print or type name of person signing above
Date 41-10-aC)
Gb.ual M..,,.�` — CGP dPS
Title
SPPP Certification 10/13

SDO Narrative Description and BMP Summary
* DUKE
ENERGY.
Location: Riverbend Steam Station
Permit No. NCS000549
OUffallID
SWO18
Discharge Structure
18" RCP
Location
East side of station along
Intake Canal
Latitude - Longitude
35°24'41.9"N -
80°58'29.9"W
�.
Drainage Area
16.1
Percent Impervious
n/a
Permit Monitoring
10
Table
Industrial Activities
The drainage area for the proposed stormwater outfall SWO18 covers a total
and Description
area of 8.8 acres. The majority of stormwater is generated due to runoff from
the substation pad. This stormwater will be collected using a network of
catch basins and storm drains and subsequently conveyed to a detention
basin and then discharged through the new outfall. The detention basin will
also receive sheet flow from a grassed area around the substation pad. The
area where the substation pad is built used to be the coal stock pile area
when the plant was under operation. The substation pad will be covered with
6 inches of #57 stone and contain various electrical equipment including
transformers, circuit breakers, and metering devices. The substation will be
built in two phases. Phase One will be the construction of a 1001kV switchyard
and Phase Two will be the 44kV transformation yard. The transformers
containing mineral oil will be located in the 44kV yard. Drainage will be
routed to a 10,000 gallon oil water separator (proposed for construction) prior
to discharge into the detention basin.
Significant
Mineral Oil: There will be multiple oil -filled transformers in
Materials/Potential
the new 44kV substation which will be installed
Pollutants
during Phase 2 of the Substation Construction.
The transformers contain approximately 6000-
8000 gallons of oil. The oil water separator will
be sized to accommodate the largest volume
and installed prior to transformer delivery. The
separator will tie into the storm drainage within
the switchyard and be routed to the detention
basin.
BMP Summary
Oil bearing equipment switchyards
• Level grades and gravel surfaces are constructed to retard flows and
limit the spread of spills.
• Stormwater runoff is collected in perimeter ditches and routed around
switchyard.
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part II, Section A, 2.(c)).

(.� DUKE
�C ENERGY,
Location: Riverbend Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000549
West of W.F. Lark
acres
Permit Monitoring
Table
"'UU"I 1d1 'ULO1 IC'
The drainage area includes runoff from the wooded area west of the W.F.
and Description
Lark Fossil Maintenance Facility; flow is then overland to a creek leading to
Mountain Island Lake. This drainage basin includes approximately 11,000
square feet of roofed area and 33,000 square feet of paved parking area.
There is about 250 feet of paved access road. Approximately 70 percent of
this drainage basin is paved or roofed.
Well water circulates through the heating/cooling unit at the W.F. Lark Fossil
Maintenance Facility and is discharged at this outfall as non -process
wastewater. The system is a closed loop, and maintenance chemicals are
not added.
Significant
None — upgradient storage / maintenance facilities only; non -industrial
Materials/Potential
Pollutants
Note that the stormwater piping under the upgradient parking lot may
contribute to Tier III status
Summary Per correspondence with NCDEQ on August 28, 2017, Permit NCS000549
will be rescinded when the coal ash is fully remediated, however, the W.F.
Lark facility shall be covered under NCG000496 under the metal fabrication /
maintenance category.
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part 11, Section A, 2.(c)).

(� DUKE
`C ENERGY
Location: Riverbend Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000549
North of W.F.
acres
rercem impervious 9u
Permit Monitoring 7
Table
Industrial Activities The drainage area includes wooded area north of the W.F. Lark Fossil
and Description Maintenance Facility; flow is then overland to Mountain Island Lake. This
drainage basin includes approximately 16,000 square feet of roofed area
and 50,000 square feet of paved storage area and parking lot.
Approximately 90 percent of this drainage basin is paved or roofed.
On August 24, 2017 NCDEQ recommended that outfall SW012 be
eliminated as SW010 was deemed representative of both SW010 and
Significant None
Materials/Potential
Pollutants
BMP Summary I None
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part It, Section A, 2.(c)).

(� DUKE
ENERGY,
Location: Riverbend Steam Station
SDO Narrative Description and BMP Summary Permit No. NCSOOOS49
Structure
Latitude - 135°21'39"N -
acres
W
Permit Monitoring 14
Table
mausinai This drainage area includes approximately 0.5 acres of the upgradient storage /
Activities and maintenance facilities. In addition, there are about three acres of grassed area,
Description including the slopes of below the Lark High Bay Maintenance Shop.
Approximately 500 feet of paved roadway passes through the area. About 45
percent of the total drainage area is either paved or roofed. All runoff from this
drainage basin is processed through the 20,000 gallon oil/water separator tank
#1.
signIncant I None — parKing ana non -industrial activities occur in the vicinity
Materials/Potential
Pollutants
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part II, Section A, 2.(c)).

SDO Narrative
Table
!scription and BMP Summary
SWO04
cture 18" RCP
East of Horse Ben
Beach Road
itude 35021'22"N -
80°58'32"W
4.6 acres
ious 15
ng 2
Industrial Activities
and Description
Materials/Potential
Pollutants
(y DUKE
ENERGY
Location: Riverbend Steam Station
Permit No. NCS000549
This drainage basin is bound on the west by the access road parallel to the
rail line and on the east by Horse Bend Beach Road. Approximately 15
percent of the drainage basin is paved; the rest is grass.
Note that there is a catch basin / field inlet across the street from the
stormwater outfall for this area and distributes to the adjacent wooded area.
None
— truck traffic / non -industrial activities occur in the vicinity
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part ll, Section A, 1.(b)) and BMP Summary (Part ll, Section A, 2.(c)).

SDO Narrative Description and BMP Summary
DUKE
;'ENERGY
Location: Riverbend Steam Station
Permit No. NCS000549
OUffallID
SW003
Discharge Structure
36" CMP
Location
Western bank of the
intake canal
Latitude - Longitude
35021'40"N - 80058'32"W
Drainage Area
14.6 acres
Percent Impervious
5
Permit Monitoring
1
Table
Industrial Activities
This drainage area includes approximately one-half acre of the slopes below
and Description
the Lark Maintenance Facility. Approximately ten acres of lawn area border
the plant access road. Drainage from the three acre, upper 230 kV
switchyard is discharged into a concrete ditch which leads to this outfall.
About 900 feet of paved access road and 800 feet of railways border this
area. Approximately 5 percent of this drainage basin is paved.
Significant
Oil: Switchgear equipment in the upper 230 kV yard contains
Materials/Potential
approximately 6,700 gallons of oil. A 400 gallon oil rupture
Pollutants
collection tank collects drainage from the two station service
transformers which contain a total of 226 gallons of mineral oil.
Runoff from the upper 230 kV switchyard is discharged into a
concrete ditch running along the north side of the yard. The ditch
passes under the plant access road through a 36 inch diameter
CMP. The west end of the CMP has a swing gate which would be
closed to help contain oil spillage from the switchyard.
BMP Summary
Liquid Storage Tanks/Oil Bearing Equipment
• If containment structures have drains, ensure that the drains have
valves, and that valves are maintained in the closed position.
Institute protocols for checking/testing stormwater in containment
areas prior to discharge.
• Inspect storage tanks and piping systems (pipes, pumps, flanges,
couplings, hoses, and valves) for failures or leaks and perform
preventive maintenance.
• Properly dispose of chemicals that are no longer in use.
• Develop and implement spill plans or spill prevention, containment,
and countermeasure (SPCC) plans.
Oil bearing equipment switchyards
• Level grades and gravel surfaces are constructed to retard flows and
limit the spread of spills.
• Stormwater runoff is collected in perimeter ditches and routed
around switchyard.
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part Il, Section A, 1.(b)) and BMP Summary (Part Il, Section A, 2.(c)).

SDO Narrative Description and BMP
BMP Summary
"'t , DUKE
ENERGY.
Location: Riverbend Steam Station
Permit No. NCS000549
Liquid Storage Tanks/Oil Bearing Equipment
• If containment structures have drains, ensure that the drains have
valves, and that valves are maintained in the closed position. Institute
protocols for checking/testing stormwater in containment areas prior to
discharge.
• Inspect storage tanks and piping systems (pipes, pumps, flanges,
couplings, hoses, and valves) for failures or leaks and perform
preventive maintenance.
• Properly dispose of chemicals that are no longer in use.
• Develop and implement spill plans or spill prevention, containment, and
countermeasure (SPCC) plans.
Oil bearing equipment switchyards
• Level grades and gravel surfaces are constructed to retard flows and
limit the spread of spills.
• Stormwater runoff is collected in perimeter ditches and routed around
switchyard.
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part II, Section A, 2.(c)).

SDO Narrative Description and BMP Su
intake canal
Table
(� DUKE
ENERGY,
Location: Riverbend Steam Station
Permit No. NCS000549
Industrial Activities This drainage area includes runoff from the 44 kV switchyard, lower 230 kV
and Description switchyard, and a portion of the main switchyard; these areas cover 3.5 acres,
including half an acre of yard and parking. To the south of the main switchyard,
there are approximately 4.3 acres of lawn area.
The railroad embankment along the eastern basin boundary is sloped at a ratio
of 1.5 horizontal to 1 vertical (1.5H: 1 V). The embankment and railways cover
approximately 2.3 acres. About one mile of railways and one-third mile of
paved roadways pass through the area. Due to the removal / closure of the ash
basin, ash hauling is no longer occurring onsite.
Approximately 35 percent of this drainage basin is paved. All runoff from this
drainage basin is processed through the 10,000 gallon oil separator tank #2.
There is a vehicle rinse area within this basin, but the effluent is not discharged
through this outfall because it is routed to the ash basin through the septic
system.
Effective July 7, 2017 a new Erosion and Sediment Control Plan (GASTO 2017-
016) was approved for the 100kV Switchyard Demolition and Stormline
Installation (Phase 6). This new E&SC Plan necessitated replacement of the
existing SW002 stormwater discharge pipe, which occurred on 9/18/17 by
Earnhardt Grading. The original discharge has been abandoned in place.
Significant Oil: The 44 kV switchyard contains a total volume of 5,000
Materials/Potential gallons of mineral oil. The main switchyard is only
Pollutants partially located within this drainage area. Transformer
7A and its 7,500 gallons of mineral oil are located in this
drainage area. Some switchgear equipment has
containment pits beneath them. In addition, the diesel
fuel storage tank (280 gallons) and unloading
operations are located here on the east side of the
powerhouse.
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part II, Section A, 2.(c)).

Riverbend - Stormwater Outfall SWO02 Monitori
�a az
Oa DSo\ ♦ cad �a otia\ 'a°tea\ a� � ota\ ova ewe\ OSG 'L'11 �.5'L yp'L yP0 .yyA .yGO yes
FQ F4 �a� to ,ea zec P° t�1� aF a°F QQz 4e� aa� iFo \ec�o a�JF cvc ac°aA � a P Pao Pao Pao F P� Pa°c Fec
Sa Sa l° off' 4° S� Pa e° �e La Lr c,° ?` .e oc �.e .ar riF .Se ri` oL0 oL0 aLQ' aL� oL� oL� 0<0 �oF
Benchmark
6.0-9.0
100
0.0003
0.34
N/A
0.065
0.003
0.9
0.010
0.335
0.075
0.09
0.056
N/A
0.126
N/A
15
<-Detect->
Units
inches
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
ng/L
mg/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
11/30/2015
12/14/2D15
0.91
6.90
22
<0.0003
0.00217
<0.05
<0.001
<0.001
0.00220
0.00744
0.00147
0.00216
<0.001
<0.0019
<0.0002
0.011
9.50
<4.3
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
5/17/2016
6/8/2016
0.42
8.31
1400
0.0012
0.00595
<0.05
<0.00116
<0.00222
0.0369
0.112
0.0263
<0.0426
<0.001
<0.00761
0.000268
1.D40
8.84
<4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
Tier One (TSS, Silver, Copper, Zinc)
11/29/2016
12/14/2016
0.36
6.76
1100
0.00115
0.00709
<0.05
0.0012
0.0035
0.0487
0.1600
0.0363
0.0456
<0.001
0.0114
0.00039
1.320
37.20
<4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
Tier One (Cadmium) Tier Two (TSS, Silver, Copper, Zinc)
1/20/2017
2/3/2017
3.01
7.54
130
<0.0003
0.00232
<0.05
<0.001
<0.001
0.00793
0.0298
0.00575
0.00908
<0.001
0.00477
<0.0002
0.337
11.30
<4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
Tier Two (TSS, Silver, Copper, Zinc)
2/15/2017
3/2/2017
0.27
7.20
54
<0.0003
0.00115
<0.05
<0.001
0.00107
0.00365
0.0209
0.00237
0.00402
<0.001
0.00404
<0.0002
0.451
6.14
<4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
Tier Two (TSS, Silver) Tier Three (Copper, Zinc)
3/13/2017
3/30/2017
0.16
7.73
<5
<0.0003
<0.001
0.052
<0.001
<0.001
0.00119
0.00415
<0.001
<0.001
<0.001
0.00424
<0.0002
0.166
1.67
<4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
Tier Two (TSS) Tier Three (Copper, Zinc)
4/3/2017
4/18/2017
0.58
6.95
16
<0.0003
<0.001
<.0.05
<0.001
<0.001
0.00160
0.0124
<0.001
0.00166
<0.001
0.0037
<0.0002
0.209
2.85
<4
<0.4
<0.4
<0.4
<0.4
<0.41
<0.4
<0.4
Tier Three (Copper; Zinc)
5/1/2017
5/15/2017
0.31
6.11
46
<0.0003
0.00132
<.0.05
<0.001
<0.001
0.00340
0.0216
0.00244
0.00353
<0.001
0.00256
<0.0002
0.276
6.59
<4
1
NO PCB sampling required effective 4/17/17.
JUNE
No Sample - Adverse Weather
JULY
No Sample - Adverse Weather
8/31/2017
9/18/2017
0.66
8.20
170
0.00268
0.00502
<.0.05
<0.001
0.00217
0.017
1.040
0.0103
0.0498
<0.001
0.00604
<0.0002
1.00
25.9
<4.7
Tier Three (Copper, Zinc, TSS)
9/6/2017
9/19/2017
0.87
7.56
560.0
0.000657
0.00615
<.0.05
<0.001
0.00192
0.0303
0.197
0.0185
0.0499
<0.001
0.00626
<0.0002
1.06
88.9
<4.5
Tier Three (Copper, Zinc, TSS, Silver)
10/23/2017
11/7/2017
2.13
7.69
12.0
<0.0003
<0.001
0.054
<0.001
<0.0011
0.00284
0.00327
<0.001
<0.001
<0.0011
0.00267
<0.0002
0.0281
1.11
0.7
NOVEMBER
I
No Sample - Adverse Weather
12/20/2017
1/5L218
0.90
6.55
25.0
<0.0003
0.00126
<0.05
<0.001
<0.001
0.00537
0.00317
0.00137
<0.001
<0.001
<0.001
<0.0002
0.036
4.78
<4.9
1/11/2018
1/25/2018
0.13
7.99
<51
<0.0003
<0.001
<0.05
<0.001
<0.001
0.00192
0.00293
<0.001
<0.001
<0.001
.0.00194
<0.0002
0.036
1.74
<4.3
1
1
No Sample -Adverse Weather
FEBRUARY
3/6/2018
3/21/2018
0.40
7.30
9.0
<0.0003
<0.001
<0.05
<0.001
<0.001
0.00222
0,00234
<0.001
0.00274
<0.001
<0.001
<0.0002
0.039
10.1
<4.2
4/23/2018
5/4/2018
0.41
7.30
22.0
<0.0003
<D.001
<0.05
<0.001
<0.001
0.00301
0.00555
0.00102
0.00101
<0.001
O.D01
<0.0002
0.044
10.5
<4.4
MAY
No Sample - Adverse Weather
JUNE
No Sample - Adverse Weather
7/23/2018 8/3/2018
0.15
7.60
100
<0.0003
0.00266
<0.05
<0.001
<0.001
0.00156
0.0206
0.006
0.077
<0.0011
0.00314
<0.0002
0.161
51.6
<4.8
iTier One(Lead)Tier Three (Copper, Zinc, TSS, Silver)
AUGUST
I
No Sample - Adverse Weather
SEPIEMBER
No Sample - Adverse Weather
OCTOBER
No Sample - Adverse Weather
NOVEMBER
No Sample - Adverse Weather
12/20/2018
1/9/2019
1.71
6.94
82
<0.0002
0.00143
<0.05
<0.001
<0.001
0.00573
0.00732
0.00246
0.00618
<0.001
<0.001
<0.0002
0.058
11.0
<4.3
01 1/29/29
2/18/2019
0.10
7.90
<5
<0.0002
<0.001
<0.05
<0.001
<0.001
0.00102
0.00201
<0.001
<0.001
<0.001
<0.001
<0.0002
0.025
3.5
<5.0
FEBRUARY
No Sample - Adverse Weather
MARCH
No Sample - Adverse Weather
4/12/2019 4/29/2019
1.00
7.50
10
<0.0002
<0.001
<0.05
<0.001
<0.001
<0.001
0.00182
<0.001
<0.001
<0.001
<0.001
<0.0002
0.024
3.33
<5.0
5/11/2019 5/28/2019
1.03
7.54
6.6
<0.0002
<0.001
<0.05
<0.001
<0.001
<0.001
0.00178
<0.001
<0.001
<0.001
<0.001
<0.00D2
0.025
6.39
<5.0
6/7/2019 6/24/2019
1.12
7.10
14
<0.0002
<0.001
<0.05
<0.001
<0.001
0.00130
0.00451
0.00301
0.00118
<0.001
<0.001
<0.0002
0.044
3A
<5.0
JULY
No Sample - Adverse Weather or No Flow
AUGUST
No Sample -Adverse Weather or No Flow
SEPiEMBER
No Sample -Adverse Weather or No Flow
OCFOBER
No Sample -Adverse Weather or No Flow
11/12/20191 1
0.44
7.40
<2.8
<0.0002
<0.001
<0.05
<0.001
<0.001
<0.001
0.00202
<0.001
<0.001
<0.001
0.00141
<0.0002
0.03
1.28
<5.0
Riverbend ISW Recap Notes: Mercury above 12 ng/L must be reported on the DMR but does not activate a Tier response
No longer Tier 1 after one sample below benchmark
No longer Tier 2 afterthree consecutive samples below benchmark
Tier 3 and Monthly sampling for the life of the Permit

Riverbend - Stormwater Outfall SWO03 Monitoring
Le / a5
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N/A
0.065
0.003
0.9
0.010
0.335
0.075
0.09
0.056
N/Al
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N/A
15
<-Detect->
Units
inches
mg/L
mg/L
mg/L
mg/L
mg/L
<0.001
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
ng/L
mg/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
11/30/2015
12/14/2015
0.91
7.26
9
<0.0003
0.00100
<0.05
<0.001
0.00200
0.0049
0.00131
<0.001
<0.001
<0.001
<0.0002
0.063
8.580
<4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
5/17/2016
6/8/2016
0.42
8.81
900
<0.0003
0.00438
<0.05
<0.001
<0.001
0.00846
0.0160
0.00828
<0.0101
<0.001
<0.00187
<0.0002
1.140
26.40
<4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
Tier One (TSS, Copper, Zinc)
11/29/2016
12/14/2016
0.36
6.80
400
<0.0003
0.00412
<0.05
<0.001
<0.001
0.02330
0.0453
0.01670
0.01560
<0.001
0.00423
<0.0002
0.250
23.80
<4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
Tier Two (TSS, Copper, Zinc)
1/20/2017
2/3/2017
3.01
7.96
86
<0.0003
0.00190
<0.05
<0.001
<0.001
0.00947
0.0160
0.00532
0.00558
<0.001
0.00122
<0.0002
0.064
10.20
<4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
Tier Two (TSS, Copper, Zinc)
2/15/2017
3/2/2017
O.271
7.001
43
<0.0003
<0.001
<0.05
<0.001
<0.001
0.001511
0.00196
0.00112
<0.001
<0.001
<0.001
<0.0002
0.122
4.890
<4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
Tier Two (TSS, Copper, Zinc)
3/13/2017
3/30/2017
0.16
7.67
<5
<0.0003
<0.001
<0.05
<0.001
<0.001
<0.001
<0.001
<0.001
<0.001
<0.001
<0.001
<0.0002
0.032
0.846
<4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
Tier Two (Copper)
4/3/2017
4/18/2017
0.58
6.90
<5
<0.0003
<0.001
0.052
<0.001
<0.001
<0.001
<0.001
<0.001
<0.001
<0.001
<0.001
<0.0002
0.037
0.704
<41
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4No
Tier Status
JUNE
JULY
No sample required. Semi -Annual.
8/31/2017 9/19/2017
0.66
8.60
39
<0.0003
<0.001
0.058
<0.001
<0.001
0.00304
0.00415
0.00134
<0.001
<0.001
<0.001
<0.0002
0.147
<0.5
<4.8
NO PCB sampling required effective 4/17/17
SEPTEMBER
No sample required. Semi -Annual.
OCTOBER
No sample required. Semi -Annual.
NOVEMBER
No sample required. Semi -Annual.
DECEMBER
No sample required. Semi -Annual.
1/11/2018 1/ 55/2018
0.13
7.95
<5
<0.0003
<0.001
<0.05
<0.001
<0.001
<0.0011
0.00119
<0.001
<0.001
<0.001
<0.001
<0.0002
0.026
0.898
<4.2
FEBRUARY
No sample required. Semi -Annual
MARCH
No sample required. Semi -Annual.
APRIL
No sample required. Semi -Annual.
MAY
INO
No sample required. Semi -Annual.
JUNE
No sample required. Semi -Annual.
JULY
FLOW
AUGUST
No Sample - Adverse Weather
SEPTEMBER
No Sample - Adverse Weather
OCTOBER
No Sample - Adverse Weather
NOVEMBER
No Sample - Adverse Weather
12/20/2018 1/9/2019
1.71
6.02
24
<0.0002
<0.001
<0.05
<0.001
<0.001
0.00104
0.00364
<0.001
0.00124
<0.001
<0.001
<0.00021
0.0451
5.01
<4.3
FEBRUARY
No Sample - Adverse Weather
MARCH
No Sample - Adverse Weather
4/12/2019 4/29/2019
1.00
7.90
<5
<0.0002
<0.001
<0.05
<0.001
<0.001
<0.001
0.00119
<0.001
<0.001
<0.001
<0.001
<0.0002
0.030
0.975
<5.0
MAY
I
jNoSample- No Flow
TUNE
No Sample - No Flow
JULY
No Sample - Adverse Weather or No Flow
AUGUST
No Sample - Adverse Weather or No Flow
SEPTEMBER
No Sample - Adverse Weather or No Flow
OCTOBER
No Sample - Adverse Weather or No Flow
11/12/2019
0.44
7.30
10
<0.0002
<0.001
<0.05
<0.001
<0.001
<0.001
0.0051
<0.001
<0.001
<0.001
<0.001
<0.0002
0.044
3.68
<5.0
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Benchmark
6.0-9.0
100
15
<-Detect->
Tier One (PCB)
Tier Two (PCB)
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample -Adverse Weather
No Sample -Adverse Weather
Missed Sample Collection PCBs, O&G
Tier Two (PCB)
Tier Two (PCB)
No Tier Status
No sample required. Semi -Annual
No sample required. Semi -Annual
No Sample - Adverse Weather
No sample required. Semi -Annual
No sample required. Semi -Annual
No sample required. Semi -Annual
No sample required. Semi -Annual
No sample required. Semi -Annual
sample required. Semi -Annual
No sample required. Semi -Annual
No sample required. Semi -Annual
No sample required. Semi -Annual
NO FLOW
No Sample -Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample -Adverse Weather
Units
inches
mg/L
mg/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
ug/L
11/30/2015
12/14/2015
0.91
7.17
31
<4
<0.4
<0.4
<0.4
1.4
<0.4
<0.4
<0.4
5/17/2016
6/8/2016
0.42
8.31
50
<4
<0.4
<0.4
<0.4
0.76
<0.4
<0.4
<0.4
JUNE
JULY
AUGUST
SEPTEMBER
OCTOBER
I
I
I
I
11/29/2016
12/14/2016
0.36
6.83
64
1
1/20/2017
2/3/2017
3.01
7.83
16
<4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<D.4
2/15/2017
3/2/2017
0.27
7.60
62
<4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
3/13/2017
3/30/2017
0.16
6.76
6
<4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
4/3/2017
5/1/2017
JUNE
JULY
8/31/2017
0.66
8.20
68.01
0.7
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
SEPTEMBER
OCTOBER
NOVEMBER
DECEMBER
1/11/2018 1/25/2018
0.13
7.50
<5
0.3
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
FEBRUARY
MARCH
jNo
APRIL
MAY
JUNE
JULY
AUGUST
SEPTEMBER
OCTOBER
NOVEMBER
I
12/20/2018 1/9/2019
1.71
6.39
9.6
<4.3
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
FEBRUARY
I
I
No Sample - Adverse Weather
No Sample -Adverse Weather
NO FLOW
No Sample - No Flow
No Sample - Adverse Weather or No Flow
No Sample - Adverse Weather or No Flow
No Sample - Adverse Weather or No Flow
No Sample - Adverse Weather or No Flow
MARCH
4/12/2019 4/29/2019
1.00
8.10
8.0
<5.0
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
<0.4
MAY
JUNE
JULY
AUGUST
SEPTEMBER
OCTOBER
11/12/2019
Riverhend ISW Recap

de:)a8 MSI puagianla
8T/9/8 pauopuegV
MOI3 ON
MOI3 ON
M013 ON
MOI3 ON
MOI3 ON
81/9Z/Z Ila3 ueal3 - MOl3 ON
MOI3 ON
MOI3 ON
MOld ON
M0I3 ON
MOI3 ON
M0I3 ON
MOI3 ON
MOI3 ON
MOI3 ON
MOI3 ON
MOI3 ON
M0I3 ON
MOI3 ON
MOI3 ON
MOI3 ON
Ainr
3Nnr
AVW
Tb'0
IIddV
H38VW
Advnve3i
AdvnNV(
06'0
839 W 3330
U391/43AON
ET Z
8390130
18'0
11391A131d3S
99'0
Isno v
Ain
TE'0
LTOZ/T/S
85'0
LTOZ/£/b
91'0
LTOZ/ET/E
LZ'0
LTOZ/ST/Z
WE
LTOZ/OZ/T
9E'0
9TOZ/6Z/TT
Zb'0
9TOZ/LT/S
T6'0
STOZ/OE/TT
I/8w
I/Bw
I/8w
I/8w
sapul
s]lun
9ZT'0
OTO'0
IST
1001
0.6-0'9
1
iliewpuag
�07
Sol°�\
guiaoliuow 800MS Ilellnp aajemwjojS - puagaanib

Riverbend - Stormwater Outfall SWO10 Monitoring
O5° a Bey
`0 ,pc `oF
Benchmark
6.0-9.0
100
15
0.010
0.126
Tier One (Zinc)
Tier One (pH)
Tier One (TSS, Copper, Zinc)
No Sample - Within 60 Day Period
Tier Two (Copper, Zinc)
Tier Two (Copper) Tier Three (Zinc)
Tier Three (Copper, Zinc)
Tier One (pH) Tier Three (Copper, Zinc)
No Sample - Adverse Weather
No Sample - Adverse Weather
Tier Three (Copper, Zinc)
No Sample -Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
Units
inches
mg/L
mg/L
mg/L
0.008
mg/L
0.395
11/30/2015
12/14/2015
0.91
7.17
<5
<4
5/17/2016
6/8/2016
0.42
5.15
<5
<4
0.0044
0.0874
11/29/2016
12/14/2016
0.36
6.78
150
<4
0.046
1.24
1/20/2017
N/A
2/15/2017
3/2/2017
0.27
7.00
19
<4
0.021
0.419
3/13/2017
3/30/2017
0.16
7.08
7
<4
0.019
0.232
4/3/2017
4/18/2017
0.58
6.45
84
<4
0.039
0.554
5/1/2017
5/15/2017
0.31
5.83
38
<4
0.014
0.204
JUNE
JULY
8/31/2017
9/18/2017
0.66
7.90
29.0
<4.3
0.032
0.523
9/6/2017
9/19/2017
0.87
7.81
210
<4.8
0.021
0.113
10/23/2017
11/7/2017
2.13
8.80
8.0
<4.7
0.010
0.291
NOVEMBER
12/20/2017
1/5/2018
0.90
8.51
32.0
<4.5
0.012
0.092
1/11/2018
1/25/2018
0.13
8.01
16.0
0.6
0.016
0.128
FEBRUARY
3/6/2018
3/21/2018
0.40
7.40
12.0
<4.3
0.014
0.16
4/23/2018
5/4/2018
0.411
7.20
18.0
<4.41
0.013
0.095
MAY
JUNE
7/23/2018 8/3/2018
0.15
7.10
59
0.8
0.046
0.507
AUGUST
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
1 No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample -Adverse Weather
No Sample -Adverse Weather or No Flow
No Sample - Adverse Weather or No Flow
No Sample - Adverse Weather or No Flow
No Sample - Adverse Weather or No Flow
SEPTEMBER
OCTOBER
NOVEMBER
12/20/2018
1/9/2019
1.71
6.13
21.0
<4.31
0.020
0.124
1/29/2019
2/13/2019
0.10
7.70
21.0
<5.0
0.023
0.285
FEBRUARY
MARCH
4/12/2019 4/29/2019
1.00
8.20
78.0
<5.0
0.17
0.161
5/11/2019 5/28/2019
1.03
6.73
7.2
<5.0
0.012
0.185
6/7/2019 6/24/2019
1.12
6.60
180.0
<5
0.138
0.554
1 ULY
AUGUST
SEPTEMBER
OClOBER
11/12/2019
12/1/2019
1
1
1 6.0261
0.21
1/1/20201
i
I
I
1
1 0.159
Riverbend ISW Recap

deoaU MSI puaglaAIM
b6Z'0
OZOZ/T/T
S160
9Z0'0
6TOZ/I/ZT
MOH ON JO iayleaM avanpy - aldweS ON
Mold oN JO JayleaM avanpy- aldweS oN
Mold ON JO JayleaM avanpy - aldweS ON
Mold oN JO JayleaM avanpy - aldweS oN
JayleaM avanpy - aldweS ON
iayleaM avanpy - aldweS ON
ia43eaM aSlanpy - aldweS ON
J843eaM avanpy- aldweS ON
iayleaM avanpy - aldweS ON
layleaM avanpy - aldweS ON
iayleaM avanpy - aldweS ON
iayleaM avanpy - aldweS ON
a9y3eaM avanpy - aldweS ON
iayleaM avanpy - aldweS ON
(WIZ 9addo0) aa'yl Jail
iayleaM avanpy - aldweS ON
iayleaM avanpy - aldweS ON
(Du.Z 9addo0)aa141Ja!1(SS-0 auO Jail
(ouq 9addo0) aajyl laLL
(oulZ 7addo0) aaJylJaLL
(oulZ 4addo0) aajyJJa1
(oulZ)aajyl ia.1(iaddo0) oml la11
(oulZ) aajyl1all (1addo0) omljaLL
(Quiz) oml fall (laddo0) au0 call
JayleaM avanpy - aldweS ON
iayleaM avanpy - aldweS ON
iayleaM avanpy - aldweS ON
JayleaM avanpy- aldweS ON
iayleaM avanpy - aldweS ON
(oulZ)Oml JaLL
(Ou!Z)auO laLL
8EI'0
6TOZ/ZT/TT
8380100
U38W31d35
1Sf19f v
Aim
9T8'O
O£0'O
S>
£E
08'9
ZT T
6TOZ/bZ/9 6TOZ/L/9
bE8'0
bT0"0
0'S>
b'L
9£'L
ISO'T
I
6TOZ/8Z/S 6TOZ/TT/S
09Z'O
ZTOO
10'S>
IRL
00'8
OO'T
6IOZ/6Z/b 6TOZ/ZT/b
HOUtlW
Advna3d
L9b'0
ZTO'O
0'S>
OZ
OWL
0I'0
6TOZ/£T/Z
6TOZ/6Z/T
9TZ'O
bTO'O
E'b>
ZZ
IE'9
TL'T
6TOZ/6/T
STOZ/OZ/ZT
838 W 3AON
U390100
838 W 31d3S
1Sn gnv
ZZ'T
£EO'0
E'b>
s5
OT'L
ST'O
BTOZ/E/8 STOZ/£Z/L
3NOf
Ay W
bZE'O
8ZO'O
S'b>
S9
Ob'9
Tb'O
RTOZ/bJ5
STOZ/EZ/b
LEE'0
ETO'O
b'b>
TZ
061
Ob'O
STOZ/TZ/E
91OZ/9/E
avnii83d
67
SOT'O
6'b>
b9
6T'L
£T'0
STOZ/SZ/T
SIOZ/TI/T
SbT'O
OTO'O
T'9>
£Z
861
06'0
8TOZ/S/T
LTOZ/OZ/ZT
838 W 3AON
ESb'0
bTO'0
I L'b>
OT
69'4
£T'Z
LTOZ/L/TT
I LTOZ/EZ/OT
L£1'0
L00'O
6'b>
O'TZ
Tb'8
L8'0
LTOZ/6I/6
LTOZ/9/6
LOCO
EZO'0
8'b>
O'OZ
80'8
99'0
LTOZ/8I/6
4TOZ/TE/8
Aim
3NOf
Zlb'O
8EO'0
b>
O'OZT
ZL'9
TE'O
9TOZ/SI/S
LTOZA/S
86Z'O
EZO'O
b>
O'SS
bT'L
SS'O
LTOZ/SI/b
LTOZ/E/b
LZZ'O
STO'O
b>
O'8T
T£'L
9T'0
LTOZ/0£/£
LTOZ/ET/E
SLb'O
ZZO'O
L'S>
O'EZ
06'9
LZ'O
LTOZ/Z/E
LTOZ/ST/Z
RICO
bZO'O
b>
SZ
b0'8
TO'E
LTOZ/£/Z
LTOZ/OZ/T
9L'T
650'0
b>
bZ
9TOZ/8Z/ZT
9TOZ/ET/ZT
19'T
490'0
b>
LT
b9'9
9£'0
910Z/4T/ZI
9TOZ/6Z/TT
U390100
U38 W 31d3S
isT1OOy
Al
3NOf
88T'O
E600'0
b>
S>
SE's
Zb'0
9TOZ/8/9
91OZ/41/S
56T'0
900'0
b>
S>
06'L
16'0
SIOZ/bT/ZT
STOZ/O£/TT
I/8w
T/8w
1) w
l/8w
sayoul
shun
9ZT'0
010'0
SI
OOT
O'6-0'9
Ipewyouag
_OY ,aa oY .e5 oS
z.,o oY\ o,>l zaa aaz ab��. zyy \07
Rupo;luow TZOMS Ilepnp aa;ennuaao;S - puagaaAla

Riverbend - Stormwater Outfall SWO12 Monitoring
5
aS
e
Sam eca <
A p
,`O�a Q•Z• '`�'�` �\
l Qat`L c�c��
Benchmark
6.0-9.0
100
15
0.010
0.126
Tier One (Zinc)
Tier One (TSS, Copper) Tier Two (Zinc)
Tier One (TSS, Copper) Tier Two (Zinc)
Tier One (TSS, Copper) Tier Three (Zinc)
Tier Three (Zinc)
Tier One (Copper) Tier Three (Zinc)
Tier Two (Copper) Tier Three (Zinc)
No Sample - Adverse Weather
No Sample - Adverse Weather
Per NCDEQ Inspection Summary
from 8/24/17, eliminate sampling
SWO12 as SWO10 can be represented for
both SWO12 and SW010.
Units
inches
mg/L
mg/L
mg/L
mg/L
11/30/2015
12/14/2015
0.91
6.57
<5
<4
<0.005
0.082
5/17/2016
6/8/2016
0.42
8.34
<5
<4
0.0071
0.32
11/29/2016
12/14/2016
0.36
6.78
150
<4
0.028
0.414
1/20/2017
2/3/2017
3.01
6.94
<5
<41
0.007
0.596
2/15/2017
3/2/2017
0.27
7.30
<5
<4
0.005
0.272
3/13/2017
3/30/2017
0.16
7.80
<5
<4
0.005
0.132
4/3/2017
4/18/2017
0.58
6.49
8
<4
0.011
0.147
5/1/2017
5/15/2017
0.31
6.03
41
<4
0.017
0.207
JUNE
JULY
8/31/2017
0.66
7.30
9/6/2017
0.87
6.80
17.0
<4.7
0.008
0.171
Riverbend ISW Recap

deDaa MSI puagjania
MOIJ ON
Mold ON
MOIJ ON
Mold ON
Mold ON
Mold ON
MOIJ ON
mold
---------------------
9� a \'Jova �Qe Na ono was? ?acv PoO �o � �oY a3eS a�aS
Y \� rJ \Q `?\ O\ �c • 3 \� oy sa\ �a seas ease �J`e
a•,° �S pS\ \tioY a y \ aoY a aQ� �e �\csa a�\o
� oy °y\ 2 \
sa �a� �e'' tee•' � a4° tee'' �e � °S �
� yQ0 �a0
a
Sulaojiuow STOMS Iles;np aajemwjojS - puagaania

Riverbend - Stormwater Outfall SWO18 Monitoring
a`e pay
o53\ ,Co`a �a\ ova\ le ses
o�o
G\ ova ;a\\� \ \� '. a\ •C a\ �-��
\e �yo a,�a� o`'eo to ye o0 0 \\ oa\ 0e yo\G \ \\ �•� .p\�o tea\ tc`9e o� \o'` o o \
ec
t5eo otoc e�`O aa� rto 09 eaa o'`�t` exec ray\ \c°\ etc o�F
5 S ". o •C O 5 P 0 0 G G G I P S 'i. e�` G
NO FLOW
No sample required, Semi Annual.
sample required. Semi -Annual.
sample required. Semi -Annual.
No Sample - Adverse Weather
NO FLOW
NO FLOW
NO FLOW
NO FLOW
NO FLOW
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
NO FLOW
No Sample - Adverse Weather
No Sample - Adverse Weather
NO FLOW
NO FLOW
IIIIIIIIIIIIIIII,-IIIIIIIIIIIIIII,-IIIIIIIIIIIIII,IIIIIIIIIIIIII,
IIIIIIIIIIIIII,IIIIIIIIIIIIII,IIIIIIIIIIIIII,
IIIIIIIIIIIIII,IIIIIIIIIIIIIIII,IIIIIIIIIIIIIII'llllllllllllllll,III-IIIIIIIIIIIIIIIII'lllllllllllllllll'llllllllllllllll,llllllllllllll,
llllllllllllll,
No Sample - No Flow
Riverbend ISW Recap

de:)aa MSI puagJan18
'OTOMS pue ZTOMS gJoq
Jo; paluasaidaJ aq ue:) OTOMS se ZTOMS
Suildwes ajeuiwila ELT/bZ/S woJ;
(Jewwng uoi}aadsul U3(1:)N Jad
JagjeaM aSaanpy - aldwe5 ON
JagjeaM aSaanpy - aldweS ON
(auiZ)aaJgljail (JaddoD)oMljail
(DUM aaagl Jail (Jaddo:)) auO Jail
(ouiZ)aaJgljail
(:)uiZ) aaagljail (Jaddo:)'SSl) auOJail
(:)uiZ)omljail (Jaddo:)'SSl)auOjail
(juiZ) onnl Jail (JaddoO'SSl) au0 Jail
(auW aup Jail
TLT'0
8000
L'b>
0-LT
08.9
L8'0
LIOZ/9/6
0£'L
99'0
LTOZ/T£/8
).inr
3Nnr
LOZ'0
LTO'O
b>
Tb
EO'9
TE'0
LTOZ/ST/S
LTOZ/T/S
LK-0
TTO'0
b>
8
6b'9
8S'0
LIOZ/81/b
LTOZ/E/b
ZET'0
IS00.0
b>
S>
08'L
9T'0
LIOZ/OE/E
LTOZ/ET/E
ZLZ'O
SOTO
b>
S>
OE-L
LZ'0
LTOZ/Z/E
LTOZ/ST/Z
96S'O
LOO'0
b>
S>
176'9
WE
LTOZ/E/Z
LIOZ/OZ/T
bTb'0
8ZO'O
b>
OST
8L'9
9E'0
9TOZ/bT/ZT
9TOZ/6Z/TT
ZE'0
TL00'0
b>
S>
VE'8
Zb'0
91OZ/8/9
9TOZ/LT/S
Z80'0
SOO'0>
b>
S>
LS'9
T6'0
STOZ/bT/ZT
STOZ/OE/TT
I/8w
l/8w
I/2w
l/8w
sagaui
s;iun
9ZT'0
0TO'0
ST
OOI
0'6-0'9
1
11jewpuag
zaS�y\ 0
yam°�\ \ems \ems°y\ a °��a�o
cq -- /
`ems a� a�Z
00
a"'e0
SuiaoliuoW ZToMS Ile}ono aajemwjo}S - puagaania

Riverbend - Stormwater Outfall SWO11 Monitoring
ewe \gas
oses
C.°�\�` PesJPs .�`49\ sQerae ease "o
ST Se 4° Q 4o (C Lo ti` Lo
Benchmark
6.0-9.0
100
15
0.010
0.126
Tier One (Zinc)
Tier Two (Zinc)
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
Tier One (Copper) Tier Two (Zinc)
Tier Two (Copper) Tier Three(Zinc)
Ter Two (Copper) Tier Three (Zinc)
Ter Three (Copper, Zinc)
Ter Three (Copper, Zinc)
Tier Three (Copper, Zinc)
Tier One (TSS) Tier Three (Copper, Zinc)
No Sample - Adverse Weather
No Sample - Adverse Weather
Tier Three (Copper, Zinc)
No Sample -Adverse Weather
No Sample -Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample -Adverse Weather
No Sample -Adverse Weather
No Sample - Adverse Weather or No Flow
No Sample -Adverse Weather or No Flow
No Sample - Adverse Weather or No Flow
No Sample -Adverse Weather or No Flow
Units
inches
mg/L
mg/L
mg/L
mg/L
11/30/2015
12/14/2015
0.91
7.90
<5
<4
0.008
0.195
5/17/2016
6/8/2016
0.42
8.38
<5
<4
0.0093
0.188
JUNE
JULY
AUGUST I
SEPTEMBER
I
OCTOBER
11/29/2016
12/14/2016
0.36
6.34
17
<4
0.064
1.61
12/13/2016
12/28/2016
24
<4
0.059
1.76
1/20/2017
2/3/2017
3.01
9.04
25
<4
0.024
0.749
2/15/2017
3/2/2017
0.27
6.90
23.0
<5.7
0.022
0.478
3/13/2017
3/30/2017
0.16
7.31
18.0
<4
0.015
0.227
4/3/2017
4/18/2017
0.58
7.14
55.0
<4
0.023
0.298
5/1/2017
5/15/2016
0.311
6.721
120.0
<41
0.038
0.412
JUNE
JULY
8/31/2017
9/18/2017
0.66
8.08
20.0
<4.8
0.023
0.707
9/6/2017
9/19/2017
0.87
8.41
21.0
<4.9
0.007
0.137
10/23/2017
11/7/2017
2.13
7.69
10
0.7
0.014
0.453
NOVEMBER
12/20/2017
1/5/2018
0.90
7.98
23
<6.1
0.010
0.145
1/11/2018
1/25/2018
0.13
7.19
64
<4.9
0.105
2.9
FEBRUARY
I
I
3/6/2018
3/21/2018
0.40
7.90
21
<4.4
0.013
0.337
4/23/2018
5/4/2018
0.41
6.40
65
<4.5
0.028
0.324
MAY
JUNE
7/23/2018 8/3/2018
0.15
7.10
5S
<4.3
0.033
1.22
AUGUST
SEPTEMBER
OCTOBER
NOV EM BER
12/20/2018
1/9/2019
1.71
6.31
221
0.3
0.014
0.216
1/29/2019
2/13/2019
0.101
7.80
201
<5.01
0.012
0.467
FEBRUARY
MARCH
4/12/2019 4/29/2019
1.00
8.00
78
<5.0
0.012
0.260
5/11/2019 5/28/2019
1.03
7.36
7.4
<5.0
0.014
0.834
6/7/2019 6/24/2019
1.12
6.80
33
<5
0.030
0.816
JULY
AUGUST
SEPTEMBER
OCTOBER
11/12/2019
0.138
12/1/2019
0.026
1 0.915
1/1/20201
1 0.294
Riverbend ISW Recap

deDaU msl puagJaA!g
6SI'0 I
I
I
I
JoZoZ/T/T
TZ'0
9Z0'0
6TOZ/T/ZL
mo!d ON JO Jay;eRM asJanpy - a!dweS ON
mo!d ON Jo Jay;eaM asJanpy - a!dweS ON
mo!3 ON Jo Jay;eaM asJanpy - a!dweS ON
mo!j ON Jo Jay;eam asJanpy- a!dweS ON
Jay;eaM asJanpy - a!dweS ON
J8y;e9M asJanpy - a!dweS ON
Jay;eam asJanpy - a!dweS ON
Jay;eam asJanpy - a!dweS ON
Jay;eaAA asJanpy - a!dweS ON
Jay;eam asJanpy - a!dweS ON
6TOZ/ZI/TT
U380170
U38 W3ld3S
lsn9nV
Aim
bSS'0
SETT
S>
0'08L
09'9
ZVT
6TOZ/bZ/9 6TOZ/L/9
SST'0
ZTO'0
O'S>
Z'L
EL'9
£0'T
61OZ/8Z/S 6TOZ/II/S
T9L'O
LL'O
O'S>
0'SL
U'S
001
6TOZ/6Z/b 6TOZ/ZL/b
HOUV W
AUVnU93J
S8Z'0
EZO'0
O'S>
0'TZ
OL'L
OT'0
6TOZ/£L/Z
61OZ/6Z/I
bZVO
OZO'0
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6.0-9.0
100
15
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NO FLOW
NO FLOW
NO FLOW
NO FLOW
NO FLOW
NO FLOW
NO FLOW
NO FLOW
NO FLOW
NO FLOW
NO FLOW
NO FLOW
NO FLOW
NO FLOW
NO FLOW
NO FLOW - Clean Cell 2/26/18
NO FLOW
NO FLOW
NO FLOW
NO FLOW
NO FLOW
Abandoned 8/6/18
Units
inches
mg/L
mg/L
mg/L
mg/L
11/30/2015
0.91
5/17/2016
0.42
1
1
11/29/2016
0.36
1/20/2017
3.01
2/15/2017
0.27
3/13/2017
0.16
4/3/2017
0.58
5/1/2017
0.31
JULY
AUGUST
0.66
SEPTEMBER
0.87
OCTOBER
2.13
NOVEMBER
DECEMBER
0.90
JANUARY
FEBRUARY
MARCH
APRIL
0.41
MAY
JUNE
JULY
Riverbend ISW Recap

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Riverbend - Stormwater Outfall SWO04 Monitoring
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Benchmark
6.0-9.0
100
0.0003
0.34
N/A
0.065
0.003
0.9
0.010
0.335
0.075
0.09
0.056
N/A
0.126
N/A
Adverse Weather
Adverse Weather
Units
inches
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
ng/L
6/9/2015
0.5
6/27/2015
2.25
8/11/2015
8/27/2015
0.375
7.00
650
<0.0003
0.00320
<0.05
<0.001
<0.001
0.01040
0.0200
0.00782
0.00761
<0.001
<0.001
<0.0002
0.089
12.0
Tier One (Copper and TSS)
Tier Two (Copper)
Tier One (pH, TSS), Tier Two (Copper)
Tier One (Silver, Lead and Zinc) Tier Two (TSS) Tier Three (Copper;
Tier Three (TSS, Copper)
No Sample - Adverse Weather
No Sample -Adverse Weather
No Sample -Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
Tier Three (TSS, Copper)
No Sample - No Flow
Tier Three (TSS, Copper)
No Sample - No Flow
Tier Three (TSS, Copper)
Tier Three (TSS, Copper)
No Sample -Adverse Weather
No Sample -Adverse Weather
No Sample -Adverse Weather
No Sample -Adverse Weather
No Sample - Adverse Weather
No Sample - Adverse Weather
NO FLOW
No Sample - Adverse Weather
No Sample -Adverse Weather
No Sample - Adverse Weather
NO Sample -Adverse Weather
No Sample - Adverse Weather
No Sample -Adverse Weather
NO FLOW
No Sample - No Flow
No Sample - Adverse Weather or No Flow
No Sample - Adverse Weather or No Flow
No Sample - Adverse Weather or No Flow
No Sample - Adverse Weather or No Flow
11/30/2015
12/14/2015
0.91
7.15
78
<0.0003
0.00389
<0.05
<0.001
<0.001
0.00496
0.0121
0.00343
0.00524
<0.001
<0.001
<0.0002
0.067
20.0
1/15/2016
1/22/2016
1.15
9.71
130
<0.0003
0.00310
<0.05
<0.001
<0.001 1
0.00650
0.0120
0.0045
0.00393
<0.001
<0.001
0,000652
0.063
12.5
2/3/2016
2/17/2016
0.73
6.98
2500
0.00031
0.02280
<0.05
0.00424
0.00101
0.15500
0.3070
0.14700
0.09700
<0.001
0.00269
0.00266
1.040
63.2
3/13/2016
3/24/2016
0.14
7.91
120
<0.0003
0.00196
<0.05
<0.001
<0.001
0.00843
0.0100
0.00371
0.00365
<0.001
<0.001
<0.0002
0.045
11.2
APRIL
5/17/20166/8/2016
0.42
8.01
20
<0.0003
0.00305
<0.05
<0.001
<0.001
0.00199
0.00591
0.00101
<0.001
<0.001
<0.001
<0.0002
0.016
1.705
JUNE
JULY
AUGUST
I
SEPTEMBER
OCTOBER
11/29/2016
12/14/20161
0.36
6.91
510
<0.0003
0.00234
<0.05
<0.001
<0.001
0.00202
0.00776
0.00175
0.00121
<0.001
<0.001
<0.0002
0.028
10.9
1/20/2017
N/A
3.01
2/15/2017
3/2/2017
0.27
6.90
42
<0.0003
0.00173
<0.05
<0.001
<0.001
0.00154
0.00481
<0.001
<0.001
<0.001
<0.001
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0.025
7.8
3/13/2017
0.16
4/3/2017
4/18/2017
0.58
7.22
26.0
<0.0003
0.00213
<0.05
<0.001
<0.001
0.00130
0.0053
<0.001
<0.001
<0.001
<0.001
<0.0002
0.012
8.56
5/1/2017
5/1/2017
0.31
6.33
37.0
<0.0003
0.00166
<0.05
<0.001
<0.001
0.00143
0.00498
0.00128
0.00105
<0.001
<0.001
<0.0002
0.022
5.5
JUNE
JULY
8/31/2017
9/18/2017
0.66
7.60
19.0
<0.0003
0.00289
<0.05
<0.001
<0.001
0.00117
0.00496
<0.001
<0.001
<0.001
<0.001
<0.0002
0.016
5.36
9/6/2017
9/19/2017
0.87
7.80
14.0
<0.0003
0.00186
<0.05
<0.001
<0.001
<0.001
0.00338
<0.001
<0.001
<0.001
<0.001
<0.0002
0.013
6.12
10/23/2017
11/7/2017
2.13
6.80
87.0
<0.0003
0.00369
<0.05
<0.001
<0.001
0.00669
0.0151
0.00446
0.00487
<0.001
<0.001
<0.0002
0.86
11.2
NOVEMBER
12/20/2017
1/5/2018
0.90
7.55
20.0
<0.0003
0.00163
<0.05
<0.001
<0.001
0.00103
0.00397
<0.001
<0.001
<0.001
<0.001
<0.0002
0.020
6.67
1/11/2018
1/25/2018
0.13
7.85
<5
<0.0003
0.00462
0.056
<0.001
<0.001
<0.001
0.00375
<0.001
<0.001
<0.001
<0.001
<0.0002
0.10
3.19
FEBRUARY
3/6/2018
3/21/2018
0.40
7.50
31.0
<0.0003
0.00177
<0.05
<0.001
<0.001
0.00151
0.00446
<0.001
<0.001
<0.001
<0.001
<0.0002
0.022
9.66
4/23/2018
5/4/2018
0.41
7.30
48.0
<0.0003
0.00158
<0.05
<0.001
<0.001
0.00162
0.00584
0.00123
0.00110
<0.001
<0.001
<0.0002
0.024
10.1
MAY
JUNE
JULY
AUGUST
SEPTEMBER
OCTOBER
NOVEMBER
12/20/2018 1/9/2019
1.71
6.30
56.0
<0.0002
0.00265
<0.05
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<0.001
0.00243
0.00644
<0.001
0.00245
<0.001
<0.001
<0.0002
0.0431
10.6
FEBRUARY
MARCH
4/12/2019 4/29/2019
1.00
8.10
19
<0.0002
<0.001
<0.05
<0.001
<0.001
<0.001
0.00325
<0.001
<0.001
<0.001
<0.001
<0.0002
0.026
6.67
MAY
JUNE
JULY
AUGUST
SEPTEMBER
OCTOBER
11/12/2019
Riverbend ISW Recap

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DUKE
ENERGY
Location: Riverbend Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000549
Monitoring
Table
Western bank
acres
mauscnai r-xcavanes This drainage area includes runoff from the 44 kV switchyard, lower 230 kV
and Description switchyard, and a portion of the main switchyard; these areas cover 3.5 acres,
including half an acre of yard and parking. To the south of the main switchyard,
there are approximately 4.3 acres of lawn area.
The railroad embankment along the eastern basin boundary is sloped at a ratio
of 1.5 horizontal to 1 vertical (1.5H: 1 V). The embankment and railways cover
approximately 2.3 acres. About one mile of railways and one-third mile of
paved roadways pass through the area. Due to the removal / closure of the ash
basin, ash hauling is no longer occurring onsite.
Approximately 35 percent of this drainage basin is paved. All runoff from this
drainage basin is processed through the 10,000 gallon oil separator tank #2.
There is a vehicle rinse area within this basin, but the effluent is not discharged
through this outfall because it is routed to the ash basin through the septic
system.
Effective July 7, 2017 a new Erosion and Sediment Control Plan (GASTO 2017-
016) was approved for the 100kV Switchyard Demolition and Stormline
Installation (Phase 6). This new E&SC Plan necessitated replacement of the
existing SW002 stormwater discharge pipe, which occurred on 9/18117 by
Earnhardt Grading. The original discharge has been abandoned in place.
Significant Oil: The 44 kV switchyard contains a total volume of 5,000
Materials/Potential gallons of mineral oil. The main switchyard is only
Pollutants partially located within this drainage area. Transformer
7A and its 7,500 gallons of mineral oil are located in this
drainage area. Some switchgear equipment has
containment pits beneath them. In addition, the diesel
fuel storage tank (280 gallons) and unloading
operations are located here on the east side of the
powerhouse.
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part Il, Section A, 1.(b)) and BMP Summary (Part Il, Section A, 2.(c)).

SDO Narrative Description and BMP Sum
BMP Summary
(_ DUKE
r' ENERGY
Location: Riverbend Steam Station
Permit No. NCS000549
Liquid Storage Tanks/Oil Bearing Equipment
• If containment structures have drains, ensure that the drains have
valves, and that valves are maintained in the closed position. Institute
protocols for checking/testing stormwater in containment areas prior to
discharge.
• Inspect storage tanks and piping systems (pipes, pumps, flanges,
couplings, hoses, and valves) for failures or leaks and perform
preventive maintenance.
• Properly dispose of chemicals that are no longer in use.
• Develop and implement spill plans or spill prevention, containment, and
countermeasure (SPCC) plans.
Oil bearing equipment switchyards
• Level grades and gravel surfaces are constructed to retard flows and
limit the spread of spills.
• Stormwater runoff is collected in perimeter ditches and routed around
switchyard.
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part II, Section A, 2.(c)).

DUKE
ENERGY,
Location: Riverbend Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000549
OutfallID
SW003
Discharge Structure
36" CMP
Location
Western bank of the
intake canal
Latitude - Longitude
35021'40"N - 80058'32W
Drainage Area
14.6 acres
Percent Impervious
5
Permit Monitoring
1
Table
Industrial Activities
This drainage area includes approximately one-half acre of the slopes below
and Description
the Lark Maintenance Facility. Approximately ten acres of lawn area border
the plant access road. Drainage from the three acre, upper 230 kV
switchyard is discharged into a concrete ditch which leads to this outfall.
About 900 feet of paved access road and 800 feet of railways border this
area. Approximately 5 percent of this drainage basin is paved.
Significant
Oil: Switchgear equipment in the upper 230 kV yard contains
Materials/Potential
approximately 6,700 gallons of oil. A 400 gallon oil rupture
Pollutants
collection tank collects drainage from the two station service
transformers which contain a total of 226 gallons of mineral oil.
Runoff from the upper 230 kV switchyard is discharged into a
concrete ditch running along the north side of the yard. The ditch
passes under the plant access road through a 36 inch diameter
CMP. The west end of the CMP has a swing gate which would be
closed to help contain oil spillage from the switchyard.
BMP Summary
Liquid Storage Tanks/Oil Bearing Equipment
• If containment structures have drains, ensure that the drains have
valves, and that valves are maintained in the closed position.
Institute protocols for checking/testing stormwater in containment
areas prior to discharge.
• Inspect storage tanks and piping systems (pipes, pumps, flanges,
couplings, hoses, and valves) for failures or leaks and perform
preventive maintenance.
• Properly dispose of chemicals that are no longer in use.
• Develop and implement spill plans or spill prevention, containment,
and countermeasure (SPCC) plans.
Oil bearing equipment switchyards
• Level grades and gravel surfaces are constructed to retard flows and
limit the spread of spills.
• Stormwater runoff is collected in perimeter ditches and routed
around switchyard.
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part II, Section A, 2.(c)).

SDO Narrative Description and BMP Summary
Location I East of Horse Ben
35021'22"N -
2
Table
acres
DUKE
ENERGY,
Location: Riverbend Steam Station
Permit No. NCS000549
Industrial Activities This drainage basin is bound on the west by the access road parallel to the
and Description rail line and on the east by Horse Bend Beach Road. Approximately 15
percent of the drainage basin is paved; the rest is grass.
Note that there is a catch basin / field inlet across the street from the
stormwater outfall for this area and distributes to the adjacent wooded area.
Significant None — truck traffic
Materials/Potential
Pollutants
None
occur in the vicinity
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part II, Section A, 2.(c)).

.(.� DUKE
� ENERGY.
Location: Riverbend Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000549
SW006
36" CMP
OUtfallID
Discharge
Structure
Western bank of the intake canal
35021'39"N - 80058'32"W
Location
Latitude -
Longitude
5.1 acres
45
Drainage Area
Percent
Impervious
4
Permit Monitoring
Table
This drainage area includes approximately 0.5 acres of the upgradient storage /
Industrial
Activities and
maintenance facilities. In addition, there are about three acres of grassed area,
Description
including the slopes of below the Lark High Bay Maintenance Shop.
Approximately 500 feet of paved roadway passes through the area. About 45
percent of the total drainage area is either paved or roofed. All runoff from this
drainage basin is processed through the 20,000 gallon oil/water separator tank
#1.
Significant
None — parking and non -industrial activities occur in the vicinity
Materials/Potential
Pollutants
BMP Summary
None
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part II, Section A, 2.(c)).

(� DUKE
ENERGY,
Location: Riverbend Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000549
acres
Table
.F. Lark
"""""""'Up°10CJ The drainage area includes wooded area north of the W.F. Lark Fossil
and Description Maintenance Facility; flow is then overland to Mountain Island Lake. This
drainage basin includes approximately 16,000 square feet of roofed area
and 50,000 square feet of paved storage area and parking lot.
Approximately 90 percent of this drainage basin is paved or roofed.
On August 24, 2017 NCDEQ recommended that outfall SW012 be
eliminated as SW010 was deemed representative of both SW010 and
signincant None
Materials/Potential
Pollutants
None
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part II, Section A, 2.(c)).

�C>DUKE
ENERGY.
Location: Riverbend Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000549
OUffallID
SW011
t 'r
`
Discharge Structure
181, CMP
Location
West of W.F. Lark Fossil
Maintenance Facility
Latitude - Longitude
35021'33"N - 80058'45"W
Drainage Area
1.1 acres
Percent Impervious
70
Permit Monitoring
7
Table
The drainage area includes runoff from the wooded area west of the W.F.
Industrial Activities
and Description
Lark Fossil Maintenance Facility; flow is then overland to a creek leading to
Mountain Island Lake. This drainage basin includes approximately 11,000
square feet of roofed area and 33,000 square feet of paved parking area.
There is about 250 feet of paved access road. Approximately 70 percent of
this drainage basin is paved or roofed.
Well water circulates through the heating/cooling unit at the W.F. Lark Fossil
Maintenance Facility and is discharged at this outfall as non -process
wastewater. The system is a closed loop, and maintenance chemicals are
not added.
Significant
None — upgradient storage / maintenance facilities only; non -industrial
Materials/Potential
Pollutants
Note that the stormwater piping under the upgradient parking lot may
contribute to Tier I II status
BMP Summary
Per correspondence with NCDEQ on August 28, 2017, Permit NCS000549
will be rescinded when the coal ash is fully remediated, however, the W.F.
Lark facility shall be covered under NCG000496 under the metal fabrication /
maintenance category.
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part II, Section A, 2.(c)).

(.� DUKE
`C ENERGY:
Location: Riverbend Steam Station
SDO Narrative Description and BMP Summary Permit No. NCS000549
OUffallID
SW018
Discharge Structure
18" RCP
Location
East side of station along
Intake Canal
Latitude - Longitude
35024'41.9"N -
80°58'29.9"W
_<
Drainage Area
16.1
Percent Impervious
We
Permit Monitoring
10
Table
Industrial Activities
The drainage area for the proposed stormwater outfall SW018 covers a total
and Description
area of 8.8 acres. The majority of stormwater is generated due to runoff from
the substation pad. This stormwater will be collected using a network of
catch basins and storm drains and subsequently conveyed to a detention
basin and then discharged through the new outfall. The detention basin will
also receive sheet flow from a grassed area around the substation pad. The
area where the substation pad is built used to be the coal stock pile area
when the plant was under operation. The substation pad will be covered with
6 inches of #57 stone and contain various electrical equipment including
transformers, circuit breakers, and metering devices. The substation will be
built in two phases. Phase One will be the construction of a 100kV switchyard
and Phase Two will be the 44kV transformation yard. The transformers
containing mineral oil will be located in the 44kV yard. Drainage will be
routed to a 10,000 gallon oil water separator (proposed for construction) prior
to discharge into the detention basin.
Significant
Materials/Potential
Mineral Oil: There will be multiple oil -filled transformers in
Pollutants
the new 44kV substation which will be installed
during Phase 2 of the Substation Construction.
The transformers contain approximately 6000-
8000 gallons of oil. The oil water separator will
be sized to accommodate the largest volume
and installed prior to transformer delivery. The
separator will tie into the storm drainage within
the switchyard and be routed to the detention
basin.
BMP Summary
Oil bearing equipment switchyards
• Level grades and gravel surfaces are constructed to retard flows and
limit the spread of spills.
• Stormwater runoff is collected in perimeter ditches and routed around
switchyard.
Notes:
1. Outfall fact sheet provides documentation for permit sections for narrative description of potential
pollutants (Part II, Section A, 1.(b)) and BMP Summary (Part Il, Section A. 2.(c)).

aQ °r
��C �`°
Oa,�a° Q-a\111 Co�oc
$11
^,
`1\ \\ae\ a lip as rye aQ°
5° as �a� O l
vO �O5
cO acO0 ea .oc tio�
�cl r � a
11/12/2019
0.44
Clear
N
1
1
1
N
N
N
N
12/10/2019
0.17
Clear
N
1
1
1
N
N
N
N
SW002
1/7/2020
0.11
Clear
N
1
1
1
N
N
N
N
2/6/2020
1.6
Clear
N
1
1
1
N
N
N
N
3/3/2020
0.75
Clear
N
1
1
1
N
N
N
N
11/12/2019
0.44
Lt Brown
N
1
2
1
N
N
N
N
12/10/2019
0.17
Clear
N
1
1
1
N
N
N
N
SW003
1/7/2020
0.11
Clear
N
1
1
1
N
N
N
N
2/6/2020
1.6
Lt Brown
N
1
1
1
N
N
N
N
3/3/2020
0.75
Clear
N
1
1
1
N
N
N
N
11/12/2019
0.16
Clear
N
1
1
1
N
N
N
N
12/10/2019
0.17
Lt Yellow
18
2
1
1
Y
N
N
N
SW004
1/7/2020
0.73
NO FLOW
2/6/2020
0.11
Lt Brown
N
1
1
1
Y
N
N
N
3/3/2020
0.75
Lt Brown
N
2
1
1
Y
N
N
N
11/12/2019
0.44
Clear
N
1
1
1
N
N
N
N
12/10/2019
0.17
Clear
N
1
1
1
N
N
N
N
SW006
1/7/2020
0.11
Clear
N
1
1
1
N
N
N
N
2/6/2020
0.11
Clear
N
1
1
1
N
N
N
N
3/3/2020
0.75
Clear
N
1
1
1
N
N
N
N
11/12/2019
0.44
Clear
N
1
2
1
N
N
N
N
12/10/2019
0.17
Clear
N
1
2
1
N
N
N
N
SW010
1/7/2020
0.11
Clear
N
1
1
1
N
N
N
N
2/6/2020
1.6
Clear
N
1
1
1
N
N
N
N
3/3/2020
0.75
Clear
N
1
1
1
N
N
N
N
11/12/2019
0.44
Clear
N
1
1
1
N
N
N
N
12/10/2019
0.17
Lt Tan
N
1
2
1
N
N
N
N
SW011
1/7/2020
0.11
Lt Yellow
N
1
1
1
N
N
N
N
2/6/2020
1.6
Clear
N
1
1
1
N
N
N
N
3/3/2020
0.75
Cloudy
N
2
2
1
N
N
N
N
11/12/2019
0.44
Lt Brown
N
2
1
1
N
N
N
N
12/10/2019
0.17
NO FLOW
SW018
1/7/2020
0.11
NO FLOW
2/6/2020
1.6
Clear
N
1
1
1
N
N
N
N
3/3/2020
0.75
Brown
N
3
1
2
N
N
N
N
.. CJCiI � 1w 11`y'/Y1
lif"tyl�'7 QNVI
cz°z z UJ7
. v uNHl
.. -i
No Flow for July, August, September and October 2019
No Flow for July, August, September and October 2019
No Flow for July, August, September and October 2019

F)l
RIVERBEND STEAM STATION
SITE AERIAL AND TOPOGRAPHIC MAP
STORMWATER POLLUTION PREVENTION PLAN
GASTON COUNTY, NC
DATE
DECEMBER 2019
FIGURE
FIGURE 1

r
Oa�� Fa\c�a G°\Oc
�1 °c �pJ ocl
o`L 51 r�°" aa5 yz't� Oro `Q Q °ti
11/12/2019
0.44
Clear
N
1
1
1
N
N
N
N
12/10/2019
0.17
Clear
N
1
1
1
N
N
N
N
SWO02
1/7/2020
0.11
Clear
N
1
1
1
N
N
N
N
2/6/2020
1.6
Clear
N
1
1
1
N
N
N
N
3/3/2020
0.75
Clear
N
1
1
1
N
N
N
N
11/12/2019
0.44
Lt Brown
N
1
2
1
N
N
N
N
12/10/2019
0.17
Clear
N
1
1
1
N
N
N
N
SWO03
1/7/2020
0.11
Clear
N
1
1
1
N
N
N
N
2/6/2020
1.6
Lt Brown
N
1
1
1
N
N
N
N
3/3/2020
0.75
Clear
I N
1
1
1
N
N
N
N
11/12/2019
0.16
Clear
N
1
1
1
N
N
N
N
12/10/2019
0.17
Lt Yellow
18
2
1
1
Y
N
N
N
SWO04
1/7/2020
0.73
NO FLOW
2/6/2020
0.11
Lt Brown
N
1
1
1
Y
N
N
N
3/3/2020
0.75
Lt Brown
N
2
1
1
Y
N
N
N
11/12/2019
0.44
Clear
N
1
1
1
N
N
N
N
12/10/2019
0.17
Clear
N
1
1
1
N
N
N
N
SWO06
1/7/2020
0.11
Clear
N
1
1
1
N
N
N
N
2/6/2020
0.11
Clear
N
1
1
1
N
N
N
N
3/3/2020
0.75
Clear
N
1
1
1
N
N
N
N
11/12/2019
0.44
Clear
N
1
2
1
N
N
N
N
12/10/2019
0.17
Clear
N
1
2
1
N
N
N
N
SW010
1/7/2020
0.11
Clear
N
1
1
1
N
N
N
N
2/6/2020
1.6
Clear
N
1
1
1
N
N
N
N
3/3/2020
0.75
Clear
N
1
1
1
N
N
N
N
11/12/2019
0.44
Clear
N
1
1
1
N
N
N
N
12/10/2019
0.17
Lt Tan
N
1
2
1
N
N
N
N
Mot! 1
1/7/2020
0.11
Lt Yellow
N
1
1
1
N
N
N
N
2/6/2020
1.6
Clear
N
1
1
1
N
N
N
N
3/3/2020
0.75
Cloud
N
2
2
1
N
N
N
N
11/12/2019
0.44
Lt Brown
N
2
1
1
N
N
N
N
12/10/2019
0.17
NO FLOW
SW018
1/7/2020
0.11
NO FLOW
2/6/2020
1.6
1 Clear
N
1
1
1
N
N
N
N
3/3/2020
0.75
Brown
N
3
11
2
1 N
N
N
N
RECEINvk ED
APR 27 2921
D'cNR•LAPdU QUALIV
ear,
�rtaT'rlr:�
W"00W JNINIW
GM P Z Gay
03AI303U
No Flow for July, August, September and October 2019
No Flow for Juiy, August, September and October 2019
No Flow for July, August, September and October 2019

F)l
RIVERBEND STEAM STATION
SITE AERIAL AND TOPOGRAPHIC MAP
STORMWATER POLLUTION PREVENTION PLAN
GASTON COUNTY. NC
DATE
DECEMBER 2019
FIGURE
FIGURE 1