NC0021881_NOV-2021-LV-0640 Response_20210923

ON THE SHORES OF NORTH CAROL)NA'S LARGEST NATURAL LAKE
PO, Box 145
Lake Waccarra3w, North Camlme 28450
[phone]
[phone] Fax
email: Iwtownmanagera embargmail.com
NC DEQ/DWR
Wilmington Regional Office
127 Cardinal Drive Extension
Wilmington, NC 28405
Dear Mr. Tharrington,
September 20, 2021
Member N.C. League of Municipalities
RECENED NC4XNRMWR
SEP 2 3 Z021
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Subject:NOV Response
NOV — 2021— LV — 0640
Lake Waccamaw WWTP
NPDES Permit No, NCO021881
Columbus County
The Town is in receipt of the NOV dated August 31, 2021 for violations in July's monthly
discharge monitoring report. The Town offers the following comments on the violations:
The Town's ammonia readings were elevated the second week of the month. The Town, at the
time, believed the readings to be caused by heavy rainfall and high flow readings the day of
sampling. Because the Town uses a contract lab for ammonia readings, the Town was not
aware there was an elevated ammonia reading on the third week of sampling until the
following week. As soon as the Town was aware there was a problem Town staff began looking
for the cause. After several extra samples were taken and sent to lab, the Town discovered that
the disinfection contact chamber needed to be pumped out. The Town immediately contacted
a contractor and the contact chamber was cleaned. The Dissolved Oxygen is believed to have
been low due to the ammonia readings being elevated. The ammonia readings returned to well
within acceptable limits as well as DO. There have been no further problems and there was no
economical impact.
We thank you for your consideration of this matter.
please call Kevin Powell at 910/625-9771.
Si cerely,
Damo Kemp i, Ta}ntn anager
Town of Lake Waccamaw
i
If you have any questions or comments,