NCS000548_2021 DMR_20210428

%' DUKE
ENERGY,
April 27, 2021
DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
NC Dept. of Environmental Quality
Attention: Central Files
niviSinn of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Subject: Duke Energy Carolinas, LLC
NPDES Stormwater Discharge Monitoring Report for:
Marshall Steam Station - NCS000548 — Catawba County
Year 6 Tier III monitoring
Dear Sir or Madam:
In accordance with Part III, E(2) of the above referenced NPDES Stormwater permit, the original
and one copy of the Stormwater Discharge Outfall (SDO) monitoring reports containing results of
the Tier II monthly sampling is attached.
A representative stormwater sample was collected from SWO08 on March 31, 2021, pursuant to
Tier 3 requirements. Outfall SWO08 remains in Tier 3 status for four intermittent TSS values
reported outside the benchmark range within the existing permit cycle ending April 1, 2021.
A renewed industrial stormwater permit for Marshall Steam Station was received on March 29,
2021 (effective on April 1, 2021) and requires an increase of listed facility stormwater outfall
monitoring from semi-annual to quarterly increments. Subsequently, the facility anticipates
conducting a monitoring event for Period 2 of 2021 between April 1, 2021 and June 30, 2021,
Please direct any correspondence or questions concerning the Marshall Steam Station NPDES
Stormwater Program to Robert Wylie at [phone].
Sincerely,
Rick R. Roper
General Manager III
Marshall Steam Station
attachment
www.duke-energy.com

DUKE ENERGY CORPORATION
Marshall Steam Station
8320 East NC Highway 150
Terrell, NC 28682
be w/attachment: Scott La Sala
Robert Wylie
File: CCP EHS
UPS Tracking Number 1Z8955X40399295115 Raleigh Central Office
www.duke-energy.com

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