NC0085359_NOD-2021-LV-0070 Response_20210503

Department of Public Works
I Water/Wastewater Division
4600 Goldmine Road
Monroe, NC 28110
T. 704-289-1434
=z F. 704-289-7395
www.unioncountync.gov
May 3, 2021
W. Corey Basinger,
Regional Supervisor
NCDEQ
610 East Center Avenue, Suite 301
Mooresville, NC 28115
RECEIVED/NCDEQ/DWR
MAY - 6 2021
WQROS
MOORESVILLE REGIONAL OFFICE
Dear Mr. Basinger,
w
This letter is in response to NOD-2021-LV-0070, outlining
the 021 exceedance in monthly This exceedance wasfaoresulttof
was experienced at our 12 Mile Creek WRF in FebruarY
the
multiple rain events in the system (6.26" for the month)
We Navewell
as now developed athe decision nlimit
operating
diversion to Charlotte Water's McAlpine Creek v
strategy that will enable us to optimize the diversionshouldsystem r ventt an'le y future f owf exlceedences.
treatment
capacity of the aeration basins. This strategy p
We would like to point out that the WRF achieved full treatment of all flows during this high flow
event. All parameters were well within permit limits.
We have also been conducting an l&I study through Hydrostructures Inc., which wrapped up in
January 2021. This study has already generated arehab project
&I in hewillGrassy Branch basin
commence in June
2021. We intend to continue our efforts finding andreducing
even as we address the treatment/capacity issues at the Grassy Branch WRF. If you have any
questions or concerns please contact me at 70
Andrew Neff, PE
Water & Wastewater Division Director
Cc: Hyong Yi, Public Works Administrator
Josh Brooks, Asst. Div. Director, Water & Wastewater
Bart Farmer, WRF Superintendent
Greg Morgan, Utility Services Superintendent