NCS000571_TSS Monitoring Report_20220316

ENERGY,
DUKE
March 14, 2022
Mr. Zahid Khan
North Carolina Department of Environmental Quality
Mooresville Regional Office
610 East Center Ave.
Mooresville, NC 28115
Subject: Duke Energy Carolinas, LLC
Rogers Energy Complex - Cliffside Steam Station
NPDES Industrial Storm Water
Outfall SWO17 - Total Suspended Solid
Permit Number NCS000571
Dear Mr. Khan:
Cliffside Steam Station
573 Duke Power Road
Mooresboro,
North Carolina 28114
828 657 2000
In accordance with the requirements of the Industrial Stormwater Permit NCS000571, this letter
is written notification that Cliffside Steam Station is in Tier 3 status at outfall SWO17 for Total
Suspended Solids. The benchmark value for Total Suspended Solids is 100 mg/l. The 4th Total
Suspended Solid benchmark exceedance result for the sampling event on 2/3/2022 was received
on 2/23/2022.
Stormwater sample results for Outfall SWO17 are as follows (benchmark exceedances in bold):
Date Collected
TSS Results
m 1
11/29/2016
27
4/3/2017
160
9/6/2017
17
4/23/2018
30
10/10/2018
24
4/5/2019
100
8/27/2019
7
11/12/2019
17
1/24/2020
18
2/5/2020
7.0
9/17/2020
55
2/11/2021
610
9/21/2021
150
11/11/2021
43
2/3/2022
230

Letter to Mr. Zahid Khan
Page 2 of 2
The SW017 drainage area includes a paved road adjacent to Suck Creek connecting to the Ash
Stack Area. Recent increases in TSS are due to construction and additional vehicle traffic in this
area. Cliffside has taken measures to reduce TSS by installing rock check dams in the concrete
drainage swells, rerouting storm water back in to the work area for additional residence time,
minimizing vehicle traffic, and refreshing stone to the gravel road prior to the paved road
section.
If you have any questions or need additional information please contact Elizabeth Glenn at (980)
373-0530 or Steve Hodges at [phone].
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 offines and imprisonment for knowing violations.
Sincerely,
L �
Brandon K. Sipe
General Manager I1I, Rogers Energy Complex
Regulated and Renewable Energy - Carolinas Coal Generation
USPS Certified Mail Tracking:
7017 2620 0000 7558 5724
Electronic copy:
Liz Glenn
K. McKinney
E. Kinstler
(Mooresville DEMLR-extra copy)

i
March 14, 2022
Mr. Zahid Khan
North Carolina Department of Environmental Quality
Mooresville Regional Office
610 East Center Ave.
Mooresville, NC 28115
Subject: Duke Energy Carolinas, LLC
Rogers Energy Complex - Cliffside Steam Station
NPDES Industrial Storm Water
Outfall SWO17 - Total Suspended Solid
Permit Number NCS000571
Dear Mr. Khan:
Cliffside Steam Station
573 Duke Power Road
Mooresboro,
North Carolina 28114
828 657 2000
°0aLIP
oo
o�-
In accordance with the requirements of the Industrial Stormwater Permit NCS000571, this letter
is written notification that Cliffside Steam Station is in Tier 3 status at outfall SWO17 for Total
Suspended Solids. The benchmark value for Total Suspended Solids is 100 mg/l. The 4th Total
Suspended Solid benchmark exceedance result for the sampling event on 2/3/2022 was received
on 2/23/2022.
Stormwater sample results for Outfall SWO17 are as follows (benchmark exceedances in bold):
Date Collected
TSS Results
m /1
11/29/2016
27
4/3/2017
160
9/6/2017
17
4/23/2018
30
10/10/2018
24
4/5/2019
100
8/27/2019
7
11/12/2019
17
1/24/2020
18
2/5/2020
7.0
9/17/2020
55
2/11/2021
610
9/21/2021
150
11/11/2021
43
2/3/2022
230

Letter to Mr. Zahid Khan
Page 2 of 2
The SW017 drainage area includes a paved road adjacent to Suck Creek connecting to the Ash
Stack Area. Recent increases in TSS are due to construction and additional vehicle traffic in this
area. Cliffside has taken measures to reduce TSS by installing rock check dams in the concrete
drainage swells, rerouting storm water back in to the work area for additional residence time,
minimizing vehicle traffic, and refreshing stone to the gravel road prior to the paved road
section.
If you have any questions or need additional information please contact Elizabeth Glenn at (980)
373-0530 or Steve Hodges at [phone].
I certify, under penalty of law, that this document and all attachments were prepared tinder 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,
Brandon K.Sipe
General Manager III, Rogers Energy Complex
Regulated and Renewable Energy - Carolinas Coal Generation
USPS Certified Mail Tracking:
7017 2620 0000 7558 5724
Electronic copy:
Liz Glenn
K. McKinney
E. Kinstler
(Mooresville DEMLR-extra copy)