NCS000571_Cliffside Tier I Status Notification _20240903

Eplin, Jerry W
From: Hawkins, Randy <[e-mail]>
Sent: Tuesday, September 3, 2024 10:46 AM
To: Eplin, Jerry W
Subject: [External] Cliffside Tier I Status Notification - NCS000571
Attachments: REC ISW Benchmark Exceedance Notification.pdf
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Mr. Eplin,
As directed by Section D-5 of Stormwater Permit NCS000571, a notification is required to the Mooresville Regional
Office of sample results over benchmark. Results over benchmark were received on 8/20/2024 for a sampling
event of stormwater outfalls SWO05 and Landfill Drainage 36 that occurred on 8/08/2024.
Parameter Benchmark SWO05 Landfill
Drainage 36
Hg 12 ng/L 16 ng/L
Cu 10 ug/L 10.4 ug/L
TSS 100 mg/L 150 mg/L 240 mg/L
TSS at SWO05 is now under a Tier One status.The exceedance was documented in the SWPPP, and a stormwater
management inspection was conducted. Possible causes of exceedance of the benchmark for TSS was the
process of hauling river sediment/leaf debris thru the drainage area due to a recent intake maintenance activity.
Hg, Cu,and TSS at Landfill Drainage 36 is now under a Tier One status.The exceedance was documented in the
SWPPP,and a stormwater management inspection was conducted. Possible causes of the benchmark
exceedances were a heavy rain event carrying fine soil from the Phase 1 and 2 top deck and side slopes of the
landfill.
There were also some accompanying Tier Three benchmark exceedances.The written notification for those as well
as the Tier One was mailed on 8/30/2024.Attached is a copy of that correspondence.
Please let me know if you have any questions.
Thanks,
Randy
DUKE
ENERGY.
Randy Hawkins
Permitting&Compliance
Duke Energy, Environmental Services
randy.hawkinsPduke-energy.com
[phone]
1

2

DUKE
Rogers Energy Complex
1� 573 Duke Power Road
P ENERGY® Mooresboro, NC28114
8/28/2024
NC Department of Environmental Quality
Division of Energy, Mineral,and Land Resource
610 East Center Avenue,Suite 301
Mooresville, NC 28115
Subject: Rogers Energy Complex
NPDES Permit NCS000571
ISW Tier Notification
Dear Mr. Eplin,
As directed by Part D.,Sections D-5, D-6, and D-7 of Stormwater Permit NCS000571, a notification is
required to the Mooresville Regional Office of sample results over benchmark. Results over benchmark
were received on 9/20/2024 for a sampling event of stormwater outfalls SWO04,SW005, SW016-42, and
Landfill Drainage 36 that occurred on 8/08/2024.
Parameter Benchmark SWO04 SW005 SWO16-42 Landfill
Drainage 36
Hg 12 ng/L 21 ng/L 16 ng/L
Cu 10 ug/L 13.6 ug/L 10.4 ug/L
Zn 126 ug/L 171 ug/L
TSS 100 mg/L 150 mg/L 240 mg/L 240 mg/L
* represents Tier One benchmark exceedance
*Orange represents Tier Three benchmark exceedance
TSS at SWO05 is now under a Tier One status.The exceedance was documented in the SWPPP, and a
stormwater management inspection was conducted. Possible causes of exceedance of the benchmark
for TSS was the process of hauling river sediment/leaf debris thru the drainage area due to a recent
intake maintenance activity.
Hg, Cu,and TSS at Landfill Drainage 36 is now under a Tier One status.The exceedance was
documented in the SWPPP,and a stormwater management inspection was conducted. Possible causes
of the benchmark exceedances were a heavy rain event carrying fine soil from the Phase 1 and 2 top
deck and side slopes of the landfill.
Zinc at SWO04 is currently under a Tier Three status. During the stormwater management inspection, it
was noted that the drainage area contains a switchyard with a galvanized tank and structural steel that
could be contributing to the exceedances. Previous discussions had taken place to grant Tier Relief on
SWO04, and we are hoping to take the additional requested samples soon.

40) DUKE Rogers Energy Complex
573 Duke Power Road
ENERGY® Mooresboro,NC 28114
Hg, Cu, and TSS at SWO16-42 is currently under a Tier Three status. During the stormwater management
inspection, it was noted that the drainage area contains heavy truck traffic.The Haul Road Action Plan to
improve/revise BMP measures and repairthe haul road is under implementation.
If you have any questions, please contact Randy Hawkins at(864) 356-8257 or at randy.hawkins@duke-
energy.com.
"1 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. 1 am aware that there are
significant penalties for submitting false information, including the possibility
of fines and imprisonment for knowing violations."
Sincerely,
)'4 '
Brandon K. Sipe
General Manager III
Rogers Energy Complex