NCS000546_Tier Three Notification Letter_20180416

DUKE
C ENERGY.
April 12, 2018
Mr. Zahid Khan
North Carolina Department of Environmental Quality
Mooresville Regional Office
610 East Center Ave.
Mooresville, NC 28115
Subject: Allen Steam Station
NPDES Industrial Storm water Tier Status Change
Permit # NCS000546
Gaston County
Dear Mr. Khan:
Allen Stearn Station
253 Plant Allen Road
Belmont, NC 28012
In accordance with the requirements of the Industrial Stormwater Permit NCS000546, please
accept this letter as written notification that Allen Steam Station is on Tier 3 status at outfalls
SW009 for Zinc and SW020 for Total Suspended Solids.
Storm water samples for SW009 that exceed Zn benchmarks were collected on 10/27/2015,
1/21/2017,12/20/2017, and 3/6/2018. The latest Stormwater analytical results were received
3/6/18. Stormwater samples for SW020 that exceed TSS benchmarks were collected on
10/27/15, 1/15/2016, 5/7/2016, 9/1/2016 and 3/6/2018. The latest Stormwater analytical results
were received 3/19/2018.
Several initiatives have been completed or are currently in -progress to address tier status
changes and mitigate contributing factors to benchmark exceedances:
• Repairing road shoulder rutting from truck traffic
• Installing rock checks dams
• Enhancing unpaved roads with stone entrances and mud mats
• Cleaning and bolstering storm drains
• Employing more self-contained road sweeping equipment
If you have questions or need additional information please contact Elizabeth Glenn at (980)
373-0530 or [e-mail].
"1 certify, under penalty of law, that this document and all attachments were pre pared under my
direction or supervision in accordance with a system designed to assure that qualified personnel
pro perl y 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,
cj
Terry W. Tuck
General Manager II