WQCS00030_Other Correspondence_20190417

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PUBLIC WORKS
April 17, 2019 ° ` ` I O
W. Corey Basinger, Regional Supervisor
Water Quality Regional Operations Section
Mooresville Regional Office
Division of Water Resources NC DEQ
610 East Center Avenue, Suite 301
Mooresville, North Carolina 28115
Subject: Response to Notice of Violation
Tracking Number: NOV-2019-DV-0196
Sanitary Sewer Overflows — March 2019
Collection System Permit No. WQCS00030
Statesville Collection System
Iredell County
Dear Mr. Basinger:
The City of Statesville (WQCS00030) would like to address and explain the circumstances
concerning the self —reported Sanitary Sewer Overflow (SSO) during the month of March 2019.
n .arc , a co ecttons systems operator encountered a ro en sewer pipe m e vicmt: y o �`�_,�
1602 Younger Avenue, Statesville, North Carolina. The cause of the break was related to a tree that
had fallen across the nearby creek, impeding and redirecting the flow towards the creek bank. The
redirected flow eroded the creek bank and exposed a sewer main and caused it to break. Upon
arrival, collections system staff immediately plugged the sewer main and performed a repair. The
response team replaced the broken 15-inch clay sewer pipe with a section of 16-inch ductile iron
pipe. Collections operators cleaned up the debris that resulted from the spill, restored the eroded
creek bank, and removed the tree to allow the creek to flow properly and to prevent any further
damage to the creek bank. The creek was inspected for damage caused by the spill. None was
indicated. Pictures, related to the incident and repair, have been included with this response.
The wastewater flow in the sewer main at the time of the incident was minimal and the estimated
volume of the spill during the course of the response was 700 gallons. The response time to stop
the flow and repair the main was limited to about 30 minutes. A verbal report was made that same
day to the Mooresville Regional office of DEQ.
During Statesville's last routine inspection of this collections main on December 4, 2018, the sewer
line was in good repair and showed no signs of damage. However, due to concerns that additional
areas of erosion might have occurred, the entire area of this creek bank with respect to the sewer
main has been reviewed and stabilized where indicated to prevent the likelihood of a future line
break caused by erosion of the creek bank.
If there are any questions regarding this letter, please feel free to contact me at [phone].
Sincerely,
A�Z
Donna L. Davis, Interim Utilities Director
City of Statesville Public Works
PO Box 1111 Statesville, North Carolina 28687-1111