WQCS00054_NOV-2020-DV-0066 Response_20200226

500 North Main Street
Suite # 600
Monroe, NC 28112
T. 704-296-4210
Febuary 20, 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-0066
Sanitary Sewer Overflows — January 2020
Collection System Permit — WQCS00054
Union County
Dear Mr. Basinger:
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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
202000072 1/1312020 4004 Sardis Church Road
202000159 1/24/2020 4015 Sardis Church Road
Response:
The SSO listed in this section were due to I&I introduction during heavy rains and flash
flooding. The system associated with this area was inundated with floodwaters and
increased flows at CCWRF. The new CCWRF EQ system was being utilized to
attenuate peak flows experienced during storm events, however, during construction of
the new gravity system an existing 8-inch gravity main located on the north side of
Sardis Church Road was thought to be abandoned and as such was not reconnected to
the new gravity system. This line is connected to a 12-inch line on the south side of
Sardis Church Road, however, without the parallel 8-inch line available to convey flow
the collection system experienced a severe hydraulic condition. The 8-inch line has

been connected to avoid this restriction in the future. Plans are being developed with
our CIP team to resolve to improve general hydraulics in this area.
Union County Public Works has underwent a comprehensive Master Plan (Black &
Veatch) and improvements strategy in efforts to better identify areas of improvement
within the Crooked Creek basin. Efforts such as flow monitoring studies
(CDMSmith/Hydrostructures and Frazier Engineering) to identify areas of inflow and
infiltration, capacity assessments of the CCWRF and associated lift stations, lift station
assessments to identify aging infrastructure, among others.
As a result of these studies, UCPW has developed a CIP plan to address certain areas
of concern.
® A significant plant upgrade at the Crooked Creek WRF was completed including
new headworks, a 3MG EQ basin, and process improvements. Total cost is
$7.775M project also included a new 10.3 MGD influent PS, new headworks
containing new bar screens, compactor, and grit removal/dewatering, and
relocation of 1200' of 18" gravity sewer.
® I&I flow studies have been conducted by CDMSmith (Hydrostructures) and
Frazier Engineering. These studies have narrowed the basin into concentrated
sub -basins to target I&I reduction. The intended approach is a find -fix method to
utilize funding efficiently and consistently. AM Liner has completed two sub -
basin of 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. These meters are set to be removed late February and further
recommendations will be provided by Engineer.
Further refinement of EQ flow continues. Each rain event our staff is on site to manually
run controls to maximize flow entering the EQ.
UCPW also has an 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
Page 2

Union County Public Works continues to invest funds into SSES work, capital
improvements, maintenance and operations to improve the wastewater collection
system. If further information or details regarding the CCWRF Improvements, as well
as, the CIP projects listed above are required, please feel free to contact Greg Morgan,
Superintendent/ORC, at 704-289-3288 or myself at 704-296-4215.
Thank you for your consideration on this issue.
Sincerely,
Andrew Neff, LP/(-V4
Water/Wastewater Division Director
cc: Hyong Yi, Public Works Administrator
Josh Brooks, Assistant Director, Water/Wastewater Operations
Greg Morgan, *Utility Field Services Superintendent/ORC