WQCS00054_NOV-2019-DV-0241 Response_20190603

500 North Main Street i 1 j1 t i,l
Suite # 600
`,1Q 0
Monroe, NC 28112 MOOR SVI111U REG1 NIA OfFRCE
T. 704-296-4210
June 3, 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-0241
Sanitary Sewer Overflows — April 2019
Collection System Permit — WQCS00054
Union County
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.
Incident ," Date s •
201900729 4/13/2019 6600 Stoney Creek (Hunley Creek Purnp Statiol
Response:
The SSO listed in this section was due to catastrophic pump failure. This station had one pump
out for repair when the secondary pump failed. Once we were notified, a pump and haul began
while Xylem began to mobilize a by-pass operation. Within 2 hours they were on site, station
resumed normal flow patterns on by-pass later in the morning. The pump that was being
repaired was picked up and installed the day of the spill. Once installed the by-pass remained
as a back-up. Currently we are awaiting repair on the secondary pump while the by-pass
remains on standby.

Incident
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. Plans are being
developed with our CIP team to resolve this issue.
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.
® CCWRF is undergoing a significant plant upgrade which includes new headworks, a
3MG EQ basin, and process improvement. Total cost is $7.775M includes building a
new 10.3 MGD influent PS, new headworks containing new bar screens, compactor, and
grit removal/dewatering, 3MG EQ basin, and relocation of 1200' of 18" gravity sewer.
CDMSmith is the design engineer. MB Kahn is the general contractor.
• 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. 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.
Scope of Work has been developed, funding has been secured of approx. $2M, and
contract was executed with AM Liner to complete the rehab work. Work has begun of the
focused area is due to be completed by the fall of 2019.
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 PGand FM-$1'U0U'DO0.00
VV3Xhaw Interceptor —3'2O0.00O.00
VV\NP8Improvements -$3.6OO'DOO.O0
Collection System SSES&Rehab —$2.U8O.000(not including $85kannually in
Operations)
PSUpgrades -$300'OOOannually
UCP\8yScurrent QP projectsare also ongoing with projects including:
t� VV8XhaVvSewer Improvements -$2S5'OOO.00
Blythe Creek Sewer Improvements -$3.003.2OO.00
Forest Park P8 Replacement & Interceptor Improvements -$2'54U.0UO.OU
Crooked Creek |&| Study &F<e[nndi81iDO'$2'538'3OO.UO
Suburban Estates PSrep|GCeOn8Ot-$933.00O.0O
Union County Public Works continues to invest funds into SSES work, capital improvements,
maintenance and operations to improve the wastewater collection system. |ffurther information
or details regarding theCCVVRF |nnpnDv9nOent8' as well as, theC|P projects listed above are
required, please feel free tncontact Greg Morgan, Gupehn1endent8]RC.at7O4-209-3288or
myself @t704'29O-4215.
Thank you for your consideration on this issue.
GiDc8ng|y'
� U�
A drew Neff, PE
Water/Wastewater Director
CC: Brian Matthews, /\|CP'Assistant County Manager
Josh Brooks, Assistant Director, Water/Wastewater Operation
(9nag Morgan, Utility Field Services GuporinteOdeOt/ORC