NC0021156_NOD-2021-LV-0006 Response_20210122

RECEIVED/NCDEO/DWR
JAN 2 2 2021
Ccxr—iq Gan -ity 61 Natarc
400 East Central Avenue
Post Office Box 406
Mount Holly, NC 28120
704-827-4261
704-827-6306 Fax
Website: www.mtholly.us
Permit #- NCO021156
Violation- November 121" and 131" DO violations
To whom it may concern,
CITY of MOUNT HOLLY
Wednesday, January 20, 2021
WOROS
MOORESVILLE REGIONAL OFFICE
UTILITIES DEPARTMENT
WATER TREATMENT
WASTEWATER TREATMENT
STORMWATER
GIS TECHNOLOGY
On the dates November 11 " and November 12" the City of Mount Holly WWTP had experienced a significant amount of rainfall in a
short amount of time. Because of this rainfall the effluent dissolved oxygen dropped below the permitted minimum value of 5.0 mg/1.
The dissolved oxygen was recorded as 4.6 mg/l and 0.08 mg/1.
The operators did everything possible to get the dissolved oxygen up while handling the amount of water coming into the plant. The
operators had to reduce the amount of aerators running in the plant to reduce the amount of solids flowing to the clarifiers, because of
the amount of flow coming into the plant. The plant had a max effluent flow of 7.1 mgd and 5.3 mgd for those days that caused the
low dissolved oxygen. The total rainfall for the days that caused the significant amount of flow was about 3.1 inches. When the
amount of water started to recede the operators were able to get everything running back to normal fairly quickly. The following days
the dissolved oxygen in the plant returned back to normal thanks to how quickly the operators were able to get aerators back on and
we were able to get the water through the system.
Called the regional office on the 12`", to notify someone immediately of the low dissolved oxygen. Wes directed me to include it into
the notes of the DMR.
Best Regards,
Doug Shoutd
Division Manager of Wastewater
City of Mount Holly
Office: (704)-827-4261
Cell: (704)-345-0839
E-Mail

Ploy COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
Miles Braswell, City Manager
City of Mount Holly
PO Box 406
Mt Holly, NC 28120-0406
NORTH CAROLINA
Environmental Quality
January 12, 2021
SUBJECT: NOTICE OF DEFICIENCY
Tracking Number: NOD-2021-LV-0006
Permit No. NCO021156
Mount Holly WWTP
Gaston County
Dear Mr. Braswell:
WOROS
MOORESVILLE REGIONAL OFFICE
A review of the November 2020 Discharge Monitoring Report (DMR) for the subject facility revealed the
deficiency(s) indicated below:
Limit Exceedance Deficiency(s):
Sample Limit Reported
Location Parameter Date Value Value Type of Deficiency
001 Effluent Oxygen, Dissolved (DO) 11/12/2020 5 4.6 Daily Minimum Not Reached
(00300)
001 Effluent Oxygen, Dissolved (DO) 11/13/2020 5 0.08 Daily Minimum Not Reached
(00300)
Please be aware that non-compliance with your permit could result in enforcement action by the Division of
Water Resources for these and any additional violations of State law. The Mooresville Regional Office
encourages you to take all necessary actions to bring your facility into compliance.
North fiatroGns f)epartmant of 4 nyranrnentsi Quality I 4 Wi ton of Wstet Resou roes
MooresvA4a Regional office I Frio East Center Avenue, Sufla SOL I l400raswk%, North Csrolin,A 28116
,°�° " 704463.188$

If you should need any assistance or would like to discuss this non-compliance situation, please contact Ori
Tuvia of the Mooresville Regional Office at 704-663-1.699.
Sincerely,,
Docu fined by:
A14CC681AF27425...
W. Corey Basinger, Regional Supervisor
Water Quality Regional Operations Section
Mooresville Regional Office
Division of Water Resources, NCDEQ
Cc: WQS Mooresville Regional Office - Enforcement File
NPDES Compliance/Enforcement Unit - Enforcement File
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