WQCS00009_NOV-2019-DV-0078 Response_20190220

WSACC
150 11001:2001 + NC Star Pablic Sector • OHSAS10001;1007
February 20, 2019
W. Corey Basinger, Regional Supervisor
Water Quality Regional Operations Section
Division of Water Resources, NCDEQ, MRO
610 East Center Avenue, Suite 301
Mooresville, NC 28115
Re: NOV-2019-DV-0078, Collection System Permit No. WQCS0009
Water and Sewer Authority of Cabarrus Co Collection System, Cabarrus County
Dear Mr. Basinger:
WATER & SEWER AUTHORITY
OF CABARRUS COUNTY
Office: 232 Davidson Hwy
Concord, NC 28027
704.786 1783 ♦ 704 795,45r„44: Fax
wwwdWsaccb�g�"ar�''- r�
FEB 21 2019
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WSACC is in receipt of the NOV for a Sanitary Sewer Overflow near 3880 Cold Springs Rd., Concord, NC,
28025. Below is a summary of background information and steps taken to remediate the wastewater spill.
3880 Cold Springs Rd. Forcemain Failure and Spill:
The wastewater spill occurred due to the failure of an 8" PVC forcemain running parallel with the
east bound lane of Cold Springs Rd, near 3880 Cold Springs Rd. This pipeline was installed in
1981 and has been in continuous operation over the past 37 years.
The spill was discovered by a WSACC employee at approximately 10:25 am. The employee then
proceeded to turned off WSACC's Mount Pleasant Pump Station 42 pump station that is feeding
the line, thus stopping the spill once the pressure on the force main had dissipated (approximately
2 1/2 hours).
The pump station was turned off within 10 minutes of the spill being reported, thus greatly
minimizing the volume of wastewater spilled.
WSACC deployed several crews to the scene and excavated/located the pipe failure area.
WSACC staff was able to close the east bound lane of traffic and dig down and locate the section
of pipe that failed. The failed section of piping was removed and replaced.
The line failed in a curved area of the road. It was observed by WSACC that the existing / failed
PVC pipeline appeared to have been installed with a slightly excessive bend or deflection in the
pipe joint, from initial construction. It is WSACC's opinion that this issue contributed to the
failure. This excessive pipe deflection was remedied by the replacement pipe installation.
WSACC monitors this line on a regular basis and will continue to be proactive in watching for
any leaks or needed repairs.
WSACC will continue to monitor this area along with other areas throughout our system. WSACC will also
continue to be proactive to protect our facilities and to take all steps possible to prevent future spills. Please let
me know if you have any questions.
Sincerely,
had VonCannon, PE
Assistant Engineering Director
cc: Mr. Tim Kiser, Engineering Director
Mr. Wayne Lyles, Interceptor Supervisor