WQCS00054_NOV-2020-DV-0298 Response_20200708

500 North Main Street
Suite # 600
Monroe, NC 28112
T. 704-296-4210
July 6, 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-0298
Sanitary Sewer Overflows — May 2020
Collection System Permit — WQCS00054
Union County
Dear Mr.,singer:
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WQP
REGIONAL OFFIC"U','
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
202001361 5/11/2020 6913 Plainview Rd.
Response:
The SSO's listed in this section were due to a grease accumulation and debris in the pipeline.
Our Industrial Pretreatment Program Manager was notified and further investigations took place
in the entire zone. Educational Material was distributed, cleaning of the lines increased and this
area will continue to be monitored.
Incident # Date Location
202001400 5/19/2020 4004 Sardis Church Road
202001419 5/20/2020
202001588 5/27/2020
4004 Sardis Church Road
4004 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. Further modification are being looked into by our I&C group to optimize
some hydraulic issues we have found with the original design.
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 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
202001402 5/19/2020 630 Funderburk Road
202001420 5/20/2020 630 Funderburk Road
Response:
The SSOs listed in this section were due to I&I introduction during heavy rains and flash
flooding. The sanitary sewer overflow that occurred at the Funderburk Pump Station was a
result of heavy rainfall which inundated the wet well. This pump station serves a very small
collection system and is very susceptible to heavy rain events. Since these SSOs, we have
smoke tested, CCTV'ed all the gravity lines, and repaired six lateral connections.
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Incident # Date Location
202001589 5/27/2020 7001 Sedgewick Road
Response:
The SSO listed in this section were due to I&I introduction during heavy rains and flash flooding.
Tropical Storm Bertha dumped large amounts of rain over a prolonged period of time. The
sanitary sewer overflow occurred at the Poplin Road Pump Station, out of a sanitary sewer
manhole. This pump station is at 60% design for a new EQ. Funding has been allocated for this
project. I&I efforts are being designed including flow monitoring, pipe lining, and manhole rehab.
Incident # Date Location
202001590 5/27/2020 910 Sharon Drive
Response:
The SSO listed in this section were due to 1&I introduction during heavy rains and flash flooding.
Tropical Storm Bertha dumped large amounts of rain over a prolonged period of time. The
sanitary sewer overflow occurred at the 21/25 Pump Station from a nearby manhole. Currently,
a project to replace this lift station is underway with a new lift station is under design at this time.
Funding has been allocated. I&I efforts are being planned including flow monitoring, pipe lining,
and manhole rehab.
Overall, UCPW 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
Union County Public Works continues to invest funds into SSES work, capital improvements,
maintenance, FOG, and operations to improve the wastewater collection system.
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Thank you for your consideration on this issue. 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.
Sincerely,
L/4 Andrew Neff, PE
Water & Wastewater Division Director
cc: Hyong Yi, Public Works Administrator
Josh Brooks, Assistant Director, Water/Wastewater Operations
Greg Morgan, Utility Field Services Superintendent/ORC
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