NCS000548_Permit Mod Request with MRO Inspection Report Copy_20190417

a
April 5, 2019
APR 17 201
F y'
z sb
Mr. Zahid Khan
North Carolina Department of Environmental Quality
Mooresville Regional Office
610 East Center Ave.
Mooresville, NC 28115
Subject: Marshall Steam Station
Industrial Storm Water Permit Number NC000548
Elimination of Stormwater Outfalls
Dear Mr. Khan:
Marshall Steam Station
8320 East NC Hwy 150
Terrell, NC 28682
o: 828.478.7700
Recently at Marshall Steam Station the outlet or drainage areas for several stormwater
outfalls have been changed. These changes are described below. Based on these
changes it is requested that these outfalls be removed from stormwater permit
NCS000548.
• SWO06 - This outfall was plugged and the drainage was redirected to a ditch that
drains into the NPDES Yard Sump #1. This sump is part of the NPDES
wastewater treatment system and pumps to the recently constructed Lined
Retention Basin (LRB) which is NPDES permitted Outfall 005.
• SWO09 - This outfall used to also include roof drains from the powerhouse.
These roof drains have been redirected to Yard Sump #2 which is part of the
NPDES wastewater treatment system and pumps to the LRB. Stormwater from
a very small area (approx. 0.4 acres) drains and combines with NPDES
permitted Outfall 003.
• SW023 - This outfall was originally created in 2006 as part of the erosion control
plan for a laydown yard associated with the construction of the Flue Gas
Desulfurization System (FGD). In 2018, a new FGD wastewater treatment facility
was constructed at the location of the laydown yard. The storm water drain
system for this area is in place to capture the storm water, direct it to sumps that
discharge to the LRB.

Page 2
April 4, 2018
Letter to Zahid Khan
NCS000548
If have questions or need additional information please contact Robert Wylie at (704)
382-4669. Your cooperation in this matter is appreciated.
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 of fines and imprisonment for knowing violations.
Sincerely,
r<
Rick Roper
General Manager III
Marshall Steam Station
cc: Scott La Sala
Robert Wylie
UPS: 1Z8955X40395328819 DEQ-Mooresville

Permit: NCS000548
SOC:
County: Catawba
Region: Mooresville
Contact Person: Rick Roper
Directions to Facility:
System Classifications:
Primary ORC:
Secondary ORC(s):
On -Site Representative(s):
Compliance Inspection Report
Effective: 01/24/17 Expiration: 04/30/20 Owner: Duke Energy Carolinas LLC
Effective: Expiration: Facility: Marshall Steam Station
NC Hwy 150
Title: Station Manager
Certification:
Terrell NC 28682
Phone: [phone]
Phone:
Related Permits:
NC0004987 Duke Energy Carolinas LLC - Marshall Steam Station
Inspection Date: 05/13/2019 Entry Time: 01:OOPM Exit Time: 02:30PM
Primary Inspector: James D Moore Phone:
Secondary Inspector(s):
Reason for Inspection: Routine
Permit Inspection Type: Stormwater Discharge, Individual
Facility Status: MM Compliant ® Not Compliant
Question Areas:
Storm Water
(See attachment summary)
Inspection Type: Technical Assistance
Page 1 of 3

Permit: NCS000548 Owner - Facility: Duke Energy Carolinas LLC
Inspection Date: 05/13/2019 Inspection Type : Technical Assistance Reason for Visit: Routine
Permit and Outfalls Yes No NA NE
# Is a copy of the Permit and the Certificate of Coverage available at the site?
# Were all outfalls observed during the inspection? MM®❑
# If the facility has representative outfall status, is it properly documented by the Division?
# Has the facility evaluated all illicit (non stormwater) discharges? N El CIE]
Comment: Outfalls 006, 009 and 023 were inspected and based on physical changes at the facility they are
no longer recommended for sampling_
Page 3 of 3

Permit: NCS000548 Owner - Facility: Duke Energy Carolinas LLC
Inspection Date: 05/13/2019 Inspection Type: Technical Assistance Reason for Visit: Routine
Inspection Summary:
Based on the inspection the MRO staff recommends that outFalls SW006, SWO09 and SW023 be removed from permit
NCS000548.Physical changes have been at the facility which no longer would require sampling at these locations. See the
April 5, 2019 letter from Duke Energy for further justification.
Page 2 of 3

Energy, Mineral
and Land Resources
ENVIRONMENTAL QUALITY
May 15, 2019
Duke Energy Marshall Steam Station
Attention: Rick Roper
8320 East NC Highway 150
Terrell, North Carolina 28078
Subject: NPDES Stormwater Permit
Marshall Steam Station
Stormwater Permit NCS000548
Catawba County
Dear Mr. Roper:
ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Interim Director
t
The Mooresville Regional Office staff have reviewed your April 4, 2019 request for a determination that
stormwater discharge outfalls 006, 009 and 023 be removed from the permit. Based on the information
provided and a May 13, 2019 site inspection by MRO staff, we are approving this request. This approval is
effective with the next sampling event.
Please append this letter to your Stormwater Pollution Prevention Plan (SPPP) or permit to document that
removal of SW006, SWO09 and SW023 has been approved. If changes in drainage areas, structures, processes,
storage practices, or other activities occur that significantly alter the basis of this approval, please contact us as
approval may no longer be valid. If you have any questions or comments concerning this letter, please contact
our office at [phone].
Sincerely,
Q
Zahid S. an, CPM, CPESC, CPSWQ
Regional Engineer
Land Quality Section
em: Robert. Wvlie,.duke-energy.coin
cc: Annette Lucas, Stormwater Permitting Program, NCG030664
State of North Carolina I Environmental Quality I Energy, Mineral and Land Resources
Mooresville Regional Office ( 610 East Center Ave Ste 301 1 Mooresville, NC 28115
704 663 1699 T