NCS000549_Emails RE Outfalls and Site Visit Followup_20200416

Georgoulias, Bethany
From: Loveland, Brad P <[e-mail]>
Sent: Thursday, April 16, 2020 9:22 AM
To: Lucas, Annette
Cc: Wrenn, Brian L; Vinson, Toby; Moore, James; Khan, Zahid
Subject: [External] Riverbend Update
Attachments: Riverbend ISW Recap.xlsx; Rive rbend_OufaII_Description.DOCX; Riverbend Visual ISW
Summary.xlsx; Riverbend-Pollution Prevention Plan.pdf
External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
[e-mail]
Annette,
Attached is the ISW analytical data (recap), outfall description, visual outfall summary and a map showing drainage areas
of each outfall.
On the cover letter for the permit application, Duke will be asking for Outfalls 10 and 11 to be covered under "No
Exposure Certification" and the remaining outfalls to be rescinded. I believe this was discussed with Toby and Sheila
during their Duke Energy meeting last week.
Thanks again for all your help on this,
Brad
Brad Loveland, CPESC, CEPSCI, CFM
Duke Energy I Permitting and Compliance, Carolinas
526 South Church Street I EC13K I Charlotte, NC 28202
Office: 980 373 2820
Cell: 704 609 5637
From: Lucas, Annette <[e-mail]>
Sent: Wednesday, April 15, 2020 4:42 PM
To: Loveland, Brad P <[e-mail]>
Cc: Wrenn, Brian L <[e-mail]>; Vinson, Toby <[e-mail]>
Subject: RE: [External] RE: Update
Brad,
I am so glad that the site visit was done today.
Thank you for providing the SW outfall descriptions, can you please also summarize the eDMR data from each for the
past 5 or so years in an easy to follow format?
The only thing left to provide by the end of the month is a renewal application to extend your application
administratively while giving the Department a little more time to consider the data.
Thanks,
Annette

From: Loveland, Brad P [mailto:[e-mail]]
Sent: Thursday, April 9, 2020 8:25 AM
To: Lucas, Annette <[e-mail]>
Subject: [External] RE: Update
R Wffff Me, &Pnc.gov
xternal email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Hey Annette,
See attached. This includes stormwater outfall descriptions at Riverbend including when demo was completed.
Let me know if you need anything else.
Brad
Brad Loveland, CPESC, CEPSCI, CFM
Duke Energy I Permitting and Compliance, Carolinas
526 South Church Street I EC13K I Charlotte, NC 28202
Office: 980 373 2820
Cell: 704 609 5637
From: Lucas, Annette <[e-mail]>
Sent: Thursday, April 2, 2020 11:56 AM
To: Loveland, Brad P <[e-mail]>
Subject: Update
*** Exercise
caution.
This is an
EXTERNAL email. DO NOT open
attachments
or click
links from
unknown senders or unexpected
email. ***
Brad —
I may have an answer for you about the Riverbend rescission by Wednesday next week, I suggest you hold off on
preparing the renewal application until then.
Thanks,
Annette
Annette Lucas, PE
Stormwater Program Supervisor
Division of Energy, Mineral and Land Resources
Department of Environmental Quality
919 707-3639 office
annette.lucas(a)ncdenr.aov
deg.nc.gov/SW
512 N. Salisbury Street, Office 640-L, Raleigh, NC 27604
1612 Mail Service Center, Raleigh, NC 27699-1612
PEI

Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third
parties.
Based on the current guidance to minimize the spread of COVID-19, the Department of Environmental Quality has
adjusted operations to protect the health and safety of the staff and public. Many employees are working remotely or
are on staggered shifts. To accommodate these staffing changes, all DEQ office locations are limiting public access to
appointments only. Please check with the appropriate staff before visiting our offices, as we may be able to handle your
requests by phone or email. We appreciate your patience as we continue to serve the public during this challenging
time.

Riverbend - Stormwater Outfall SWO04 Monitoring
'x\
\.`O
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
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
5/17/2016 6/8/2016
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
SEPTEMBER
OCTOBER
11/29/2016
12/14/2016
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
<0.0002
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
<0.001
<0.001
0.00243
0.00644
<0.001
0.00245
<0.001
<0.001
<0.0002
0.043
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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n �- C�
01.
��� ��•� �
�� °� '�° 0
0\0
�z �° coz 0111
°� o �5
�p�
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
1 2
1
1 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
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

SDO Narrative Description and BMP Summary
Location: Riverbend Steam Station
Permit No. NCS000549
Outfall ID
SWO02
M +`
Discharge Structure
18" CMP
Location
Western bank of the
intake canal
-
--
Latitude - Longitude
35°21'38"N - 80°58'30"W
Drainage Area
12.3 acres
Percent Impervious
35
Permit Monitoring
1
Table
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: 1V). 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 SWO02 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)).

SDO Narrative Description and BMP Summary
BMP Summary
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 Summary
Location: Riverbend Steam Station
Permit No. NCS000549
Outfall ID
SWO03
Discharge Structure
36" CMP
Location
Western bank of the
intake canal
Latitude - Longitude
35°21'40"N - 80°58'32"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 II, Section A, 1.(b)) and BMP Summary (Part II, Section A, 2.(c)).

SDO Narrative Description and BMP Summary
Location: Riverbend Steam Station
Permit No. NCS000549
OutfallID
SWO04
k Y�'
„��"
Discharge Structure
18" RCP
Location
East of Horse Ben
Beach Road
Latitude - Longitude
35°21'22"N -
80°58'32"W
§'
Drainage Area
4.6 acres&
Percent Impervious
15
Permit Monitoring
2
Table...e.s.
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 / 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)).

SDO Narrative Description and BMP Summary
Location: Riverbend Steam Station
Permit No. NCS000549
OutfallID
SWO06
�F .
Discharge
36" CMP
Structure
mE
Location
Western bank of the intake canal
Latitude -
35°21'39"N - 80°58'32"W
Longitude
Drainage Area
5.1 acres
Percent
45
Impervious
Permit Monitoring
4
Table
Industrial
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.
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)).

SDO Narrative Description and BMP Summary
Location: Riverbend Steam Station
Permit No. NCS000549
OutfallID
SWO10
Discharge Structure
18" CMP
Location
North of W.F. Lark Fossil
Maintenance Facility
A ,
Latitude - Longitude
35°21'38"N - 80°58'41 "W
Drainage Area
1.7 acres
Percent Impervious
90
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 SWO12 be
eliminated as SWO10 was deemed representative of both SWO10 and
SW012.
Significant
None
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)).

SDO Narrative Description and BMP Summary
Location: Riverbend Steam Station
Permit No. NCS000549
Outfall ID
SW011
$ a
E`
Discharge Structure
18" CMP
Location
West of W.F. Lark Fossil
Maintenance Facility'"
Latitude - Longitude
35°21'33"N - 80°58'45"W
Drainage Area
1.1 acres
Percent Impervious
70
Permit Monitoring
7'`
Table
Industrial Activities
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
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 NC0000496 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)).

SDO Narrative Description and BMP Summary
Location: Riverbend Steam Station
Permit No. NCS000549
Outfall ID
SWO18
Discharge Structure
18" RCP
Location
East side of station along
Intake Canal
Latitude - Longitude
35°24'41.9"N -
--
Drainage Area
16.1
Percent Impervious
n/a
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
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)).

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