HomeMy WebLinkAboutWQCS00009_NOV Response_20180508WSACC
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ISO 140012015 + NC Star Public Sector 4 OHSAS 18001,2007
May 8, 2018
CERTIFIED MAIL REQUEST
RETURN RECEIPT REQUESTED
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
WATER & SEWER AUTHORITY
OF CABARRUS COUNTY
Administrative Offices
232 Davidson Hwy, Concord, NC 28027
704.786.1783 4 704.795.1564 Fax
Rocky River Regional WWTP
6400 Breezy Lane, Concord, NC 28025
704.788.4164 ♦ 704.786.1967 Fax
www.wsacc.org
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MAY 112018
WQROS
WORESVILLE REGIONAL OFF109
SUBJECT: NOTICE OF VIOLATION & INTENT TO ISSUE CIVIL PENALTY (NOV-2018-DV-0114)
Sanitary Sewer Overflows — March 2018
WSACC Collection System Permit WQCS00009
Dear Mr. Basinger:
WSACC is in receipt of the subject notice regarding the sanitary sewer overflow located near 1175 Crosspointe
Drive, NE, in Concord (NC). Following is a summary of background information and the steps taken as a result
of the overflow.
1) The area surrounding the gravity interceptor that experienced the washout and failure has
experienced significant commercial growth over the past 10 to 15 years. This development has
resulted in increased runoff along with changes to the path that runoff takes across WSACC's
interceptor. As you can see in the attached aerial photos, the drainage path that storm water flows
has changed significantly over the 2009 to 2015 period.
2) The changes to the drainage path resulted in WSACC observing the washing out of its sewer lines
contained within its right of way. In 2010, we hired a contractor to stabilize and install large diameter
rip rap in the compromised right of way area. WSACC staff continued to monitor this site along with
others that have been known to show the potential to washout within our system over the years
following large rain events.
3) WSACC staff discovered the washout and subsequent spill while in the process of installing area
velocity sewer meters within WSACC's lines to monitor inflow and infiltration. Once the damaged
pipe was discovered WSACC quickly moved to plug the line and then pump the flow through our
parallel gravity interceptor thus minimizing the quantity of flow that was spilled.
4) A contractor was hired to make the necessary repairs to the interceptor and stabilize the ROW with
large diameter rip rap. The contractor also installed a 30" culvert to allow the drainage channel to
return to the path the flow had followed in 2009.
WSACC will continue to monitor this area along with other areas throughout its system. WSACC will also continue
to be proactive in protecting its facilities and take all steps possible to prevent future spills. If you have any
questions or concerns, I may be reached at 704-788-4164, X-113 or via email at cvoncannon(wsacc.ora.
Sincerely,
aA—�-
Chad VonCannon, PE
Assistant Engineering Director
CV/blc
cc: Tim Kiser (WSACC)
Wayne Lyles (WSACC)
Beverly Metcalf (WSACC)
Attachment — Aerial Photos of Cold Water Creek 18" Interceptor Sewer