NC0073571_NOV-2022-LV-0107 Response_20220207

RECEIVED/NCDEQ/DWR
February 7, 2022
W. Corey Basinger, Regional Supervisor
Water Quality Regional Operations Section
Mooresville Regional Office
Division of Water Resources, NCDEQ
Subject: Notice of Violation and Intent to Assess Civil Penalty
Tracking Number: NOV-2022-LV-0107
Permit No. NC0073571
North Iredell High School
Iredell County
FEB 1 0 2022
WORDS
MOORESVI► I F REGIONAL OFFICE
Mr. Basinger,
Thank you for allowing North Iredell High School the opportunity to respond to the following Notice of
Violation. This response pertains to the (2) Fecal Coliform daily maximum exceedance events that occurred
during the December 2021 monitoring period.
The North Iredell High School WWTP effluent exceeded permit levels for Fecal Coliform on December 13th and
December 20th, resulting in two daily maximum violations. During this period, leaves entered the aeration basin
and settled in the clarifier, causing multiple return line blockages that required repeated jetting of the lines until
the blockages were removed. The repeated instances of clogging and jetting of the return lines created
disturbances to the clarifier that resulted in solids going over the weir and entering the chlorine basins. This,
combined with the presence of foliar debris in the clarifier and chlorination basins, created conditions that caused
fecal coliform levels to exceed the permitted limit. The jetting process involved using a water jet to release debris
from the return lines, followed by pumping the 3 chlorine basins back to the 13Q basin for treatment and
thoroughly cleaning the chlorine basins. The plant returned to compliance once the blockages had been cleared
and a final cleaning of the chlorination basins was performed. The fecal coliform result reported for the 29th was
<I col. Since this time, no further compliance problems have occurred.
It is always the goal of North Iredell High School to remain in compliance with regulations set forth by the
Division of Water Resources. It is our request that our cooperation and action in these matters be taken into
account by the Division when proceeding with enforcement.
Sincerely,
Steve Sharpe
Iredell-Statesville Schools
North Iredell High School
CC:
Dennis Murdock, Envirolink, Inc.
Josh Powers, Envirolink, Inc.
Todd Robinson, Envirolink, Inc.