NCS000548_Email RE Elimination of SW004_20200127

Georgoulias, Bethany
From: Wylie, Robert R <[e-mail]>
Sent: Monday, January 27, 2020 9:38 AM
To: Georgoulias, Bethany
Subject: [External] FW: Marshall Steam Station NCS000548 Elimination of SW004
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FYI
Below is the notification made to Mooresville DEQ on plans to close SW004. This outfall has now been abandoned.
From: Wylie, Robert R
Sent: Monday, December 16, 2019 9:36 AM
To: Moore, James <[e-mail]>
Cc: Khan, Zahid <[e-mail]>; La Sala, Joseph Scott <[e-mail]>
Subject: Marshall Steam Station NCS000548 Elimination of SW004
James,
Marshall Steam Station plans to abandon permitted stormwater outfall 004 by December 31, 2019. Duke Energy has
recently submitted a storm water renewal application to DEQ for the industrial storm water permit. In closing this
outfall once it is officially closed our plans are to request to modify the Industrial Storm Water permit and the recently
filed application. If you have a preference please let me know.
The plans for the abandonment are as described in the following. The outfall inlet is comprised of rip rap rock -lined
catch basin that collects stormwater from a contained, grassed area (0.23 acre). Historical stormwater monitoring
indicates that the outfall requires a high rainfall accumulation rate to discharge to Lake Norman and provides little
benefit for drainage. Abandonment of this outfall will result in stormwater from this area gravity draining toward the
station along the access road and drainage swale already in place. Outfall 004 closing will consist of removal of catch
basin rock, placement of a concrete plug on the inlet pipe, placement and grading of clean fill soil in the catch basin area,
and completion with seed and straw. The interior of the outlet pipe will also be permanently closed using a fitted pipe
ca p.
Once abandoned the storm water flow on the Lake Norman side of the road will be sheet flow to Lake Norman.
If you have any questions please let me know.
Thanks,
Robert Wylie
Duke Energy Corporation
Permitting and Compliance, Carolinas
704 382-4669 (office)
704 562-8258 (cell)
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