WQCS00054_NOV-2019-DV-0347 Response_20190829

August 29, 2019
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-2019-DV-0347
Sanitary Sewer Overflows — July 2019
Collection System Permit — WQCS00054
Union County
Dear Mr. singer:
Union County has received the NOV referenced above for collection system overflows.
Explanations of the overflows were on the RIMS 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.
Incidenty Date LOGation
201901141 1 [. Lytton Lane (Brookhaven Pump Statiol
Response:
The backup float system to the station named Brookhaven, failed to activate. This was corrected
on the same day that the SSO occurred. We have since instituted a preventative maintenance
program to identify and repair all of the other applicable stations in our system in order to
prevent future failures of this kind.

Incident # Date Location
Response:
The sewer overflow was the result of construction debris accumulation in the pipes. The sanitary
sewer overflow occurred behind 5012 Lydgate Drive out of a sanitary sewer manhole. The
overflow began at approximately 9:20pm lasting until 3:00am on July 15, 2019, and is estimated
at 8,500 gallons. This SSO did not impact the nearby tributary due to the lay of the land. This
particular section of sewer outfall is a main trunk line that feeds to the Millbridge Pump Station
and this section of outfall actually sits lower than the creek banks. Therefore, due to the
elevation difference, all of this SSO was retained below the creek banks and was able to be
pumped back into the infrastructure via pumps in several locations in this area. There was no
visible evidence the SSO entered waters of the state.
Incident # Date Location
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 GIP
team to improve general hydraulics in this area.
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
ooj 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
1 } f£

utilize funding efficiently and consistently. The first initial 2017 target area is southwest
of CCWRF in the Indian Trail area south of Hwy 74, west to the Union/Mecklenburg
county line.
This I&I abatement work has been completed. Additional areas for I&I abatement are being
evaluated.
Incident # Date Location
201901233 7/25/2019 211 Cupped Oak Drive (Forest Park Pump Station)
Response:
The SSO listed in this section was due to a force main break at 211 Cupped Oak Drive of the
pipeline. Once we discovered the break, we began a pump/haul of the station and mobilized a
team that made the repair within a few hours. There were no signs leading up to the break that
would indicate a failure was to occur. The pipe had a longitudinal crack and the entire joint of
pipe was replaced. Once repair was made, the area affected was cleaned and the ground
surface restored. This pump station is currently under construction replacing the wet -well,
electrical panels, ARV's, and installing a new generator set.
UCPW also has an aggressive Capital Improvement Program throughout the next 5 years. The
projects include:
Crooked Creek Basin Improvements - $24,259,922.00
Crooked Creek Interceptor Improvements Ph. 1 - $9,915,500.00
Suburban Estates PS and FM - $1,000,000.00
Waxhaw Interceptor — 3,200, 000. 00
WW PS Improvements - $3,600,000.00
Collection System SSES & Rehab — $2,080,000 (not including $85k annually in
Operations)
PS Upgrades - $300,000 annually
UCPW's current CIP projects are also ongoing with projects including:
Waxhaw Sewer Improvements - $295,000.00
Blythe Creek Sewer Improvements - $3,083,200.00
Forest Park PS Replacement & Interceptor Improvements- $2,540,000.00
Crooked Creek I&I Study & Remediation - $2,538,300.00
Suburban Estates PS replacement-$933,000.00
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
t f

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,
� k
4
Andrew Neff, PE
Water & Wastewater Division Director
cc: Hyong Yi, Public Works Administrator
Josh Brooks, Assistant Director, WaterNVastewater Operations
Greg Morgan, Utility Field Services Superintendent/ORC
i