WQCS00054_NOI NOV-2020-DV-0258 Response_20200527

Public Works
500 North Main Street
Suite # 600
Monroe, NC 28112
T.704-296-4210
May 27, 2020
Mr. W. Corey Basinger
Regional Supervisor
Water Quality Regional Operations Section
Mooresville Regional Office
610 East Center Ave., Suite 301
Mooresville, NC 28115
Subject: Notice of Violation & Intent to Issue Civil Penalty
Tracking #: NOV-2020-DV-0258
Sanitary Sewer Overflows — April 2020
Collection System Permit— WQCS00054
Union County
Dear Mr. B nger:
Union County has received the NOV referenced above for collection system overflows. Explanations of
the overflows were on the BIMS Overflow Reporting Forms submitted by Union County Public Works
(UCPW) to the NCDEQ. However, we have added a few additional facts in the explanations below.
Incident # Date Location
202001183 4/13/2020 4015 Sardis Church Road
202001288 4/30/2020 4004 Sardis Church Road
Response:
These SSOs were due to I&I introduction during heavy rains and flash flooding. The system associated
with this area was inundated with floodwaters which increased flows at the Crooked Creek Water
Reclamation Facility (CCWRF). Flows were diverted to the CCWRF equalization tank to attenuate peak
flows experienced during storm events.
We are investigating instrumentation and controls to determine if we can optimize flows into the
equalization tank. We have also optimized the influent pumps at the CCWRF to move as much flow as
possible into the WR.
Union County Public Works has a comprehensive plan with a strategy to better identify areas of
improvement within the Crooked Creek basin. We have conducted flow monitoring
(CDMSmith/Hydrostructures and Frazier Engineering) to identify areas of inflow and infiltration, capacity
assessments of the CCWRF and associated lift stations. We have also conducted lift station
assessments to identify aging infrastructure and prioritize repairs.

As a result of these studies the basin focus has been narrowed into concentrated sub -basins to target I&I
reduction. The intended approach is a find -fix method to utilize funding efficiently and consistently. A
contractor, AM Liner, has completed two sub -basin repairs from the data provided for I&I abatement. This
work has included lateral repairs and manhole rehab. Post flow meters where installed in November 2019
and removed in March 2020. These meters did not reflect much valuable data due to the record rain
events. Further metering is being considered at this time.
Incident# Date Location
202000847 4/29/2020 3020 Arsdale Road
Response:
This SSO's listed in this section were due to an accumulation and debris in the pipeline. A manhole lid
was knocked off and debris consisting of sticks and rocks caused the backup to occur. This manhole was
secured and all lines cleaned both up and down -stream for 1000 feet.
UCPW also has an
-)OP
aggressive Capital
Improvement
Program
throughout the next 5 years.
The projects
include:
Crooked Creek Basin Improvements - $23,900,000
➢ Suburban Estates PS and FM - $1,000,000.00
➢ Waxhaw Interceptor —$5,400,000
➢ WW PS Improvements - $3,500,000
UCPW's current CIP projects are also ongoing with projects including:
➢ Blythe Creek Sewer Improvements - $6,200,000
➢ Forest Park PS Replacement & Interceptor Improvements - $3,345,000
➢ Crooked Creek I&I Study & Remediation - $476,000
Union County Public Works continues to invest funds into SSES work, capital improvements,
maintenance, education on fats, oils and grease (FOG), and cleaning and inspection of the wastewater
collection system. If further information or details regarding the CCWRF Improvements and the CIP
projects listed above is needed, please contact Greg Morgan, Superintendent/ORC, at 704-289-3288 or
myself at 704-296-4215.
Thank you for your consideration on this issue.
Sincerely,
Andre P"
Water/Wastewater Division Director
cc: Hyong Yi, Public Works Administrator
Josh Brooks, Assistant Director, WaterlVllastewater Operations
Greg Morgan, Utility Field Services Superintendent/ORC
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