WQCS00054_NOV-2020-DV-0174 Response_20200504

Public Works
500 North Main Street
Suite # 600
Monroe, NC 28112
T.704-296-4210
EST. 1842
May 4, 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-0174
Sanitary Sewer Overflows — March 2020
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 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
202000847 3/2/2020 2034 Iverson Lane
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
of the entire zone. Educational Material was distributed and this area will be monitored.
Cleaning in this area has been increased as -well.
Incident # Date Location
202000869 3/3/2020 4004 Sardis Church Road
202001077 3/25/2020 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
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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
202000889 3/6/2020 1909 Highway 205
Response:
The SSO related to this incident was caused by two air -locked pumps. By the time the after-
hours personnel arrived on scene there was a small spill from the upstream manhole of the
station. The pumps where quickly repaired and the SSO was stopped. Lime and straw were
spread on the affected area the next day.
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
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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. 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,
V/L Vim"
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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