NC0056561_System Performance Annual Report 2023_20240116

Town of Akaggie Valley
System Performance Annual Report
2023
I . General Information
Facility Name - Town of Maggie Valley Sewage System
3987 Soco Road
Maggie Valley, NC 28751
Town of Maggie Valley Wastewater Treatment Plant (WWTP)
5320 Jonathan Creek Road
Waynesville, NC 28785
Contact Information
Town Manager
Vickie Best
[phone] ext. 102
Public Works Director
Michael Mehaffey (ORC) WWTP & CS
[phone] ext. 102
Public Works
Seth Boyd Backup (ORC) WWTP & CS
[phone] ext. 102
Permit Numbers:
• NPDES Permit #NC0056561
• Marketing & Distribution Permit #WQ0010615 (Class A Residuals)
• General Storm Water Permit #NCG110104
• Collection System Permit #WQC500122
• EPA Lab Code #NC01414
• North Carolina Lab Code #5171
H. Description of Facilities
A. Collection System
The Town of Maggie Valley's service area covers approximately 16 square miles. The Town provides
service to areas along Jonathan Valley from Fie Top Road to Interstate 40. There are over 47
miles of public sanitary gravity sewer line, one public pump station within the collection system and
approximately 1210 manholes system wide. There is another 4 miles of private sewer system that
drains to the Town's public collection system. The Town's collection system is considered young as
the majority of the lines were completed in 1986. Pipe sizes throughout the collection system
range from 4 inches to 18 inches with the majority (38 miles) being larger pipes 8 inches to 18
inches in size. Pipe materials used within the system include both polyvinyl chloride (PVC) and
ductile iron pipe (DIP) with the majority being PVC. The Town's 2,107 sewer customers reflect a
service population of an estimated 5,268 people.
B. Wastewater Treatment Plant (WWTP)
The present wastewater treatment plant (WWTP) is a 1.0 million gallon per day (MGD) extended
aeration secondary treatment plant serving Maggie Valley and the Jonathan Valley area. Overall
the Town services approximately 2,107 separate sewer customers with a combined customer

population of approximately 5,268. In 2023, the facility treated an average daily flow of 298,000
gallons per day. The plant consists of a step bar -screen with shaftless screw conveyor for
preliminary treatment. 2 - first stage and 2 - second stage aeration basins along with a
rectangular clarifier for secondary treatment. Disinfection is done by injecting chlorine into the
effluent and dechlorination is achieved with sulphur dioxide gas injection. Residuals are held in two
90,000-gallon aerobic digesters until dewatering is completed by a one -meter belt filter press.
Dewatered sludge is then stabilized by using the N-VIRO Alkaline Stabilization Process. Part of
the sludge is land -filled. The WWTP distributed approximately 150 tons of Class A Residuals in
2023.
III. Performance Measures
A. Collection System
• The Town of Maggie Valley has an aggressive preventive maintenance program of high-pressure
line cleaning and video inspection. This year over 29,000 lineal feet of pipeline was cleaned and
inspected in this way. This represents approximately 12% of the 47 miles of sewer system.
Public Works completed and submitted to NCDENR-DWQ, during the yearly system inspection,
two six-month High Priority Inspection Reports and a System Inspection and Maintenance
Report as required. The High Priority Line report documents inspection of aerial lines, siphons
and lines in proximity to creeks and streams. The System Inspection Report documents
oversight and walking of the entire sewer system and maintenance and repair logs.
• The collection system recorded no reportable sanitary sewer overflow (550) in 2023.
• Town Staff has completed the repairs identified during the 2020 Inflow & Infiltration Study
and found 3 additional points of I & I that contributed a substantial amount of flow. We see
the results of the Study and related repairs showing up as reduced average Daily flows from
the previous year.
B. Wastewater Treatment Plant (WWTP)
• Performance measures were successfully achieved during the 2023 annual reporting period.
The WWTP continues to provide effective/efficient treatment services to the community
averaging BOD, T55 and Ammonia removal efficiencies well above the NCDENR and EPA
requirements. Flow to the WWTP continues to remain well below hydraulic capacity for the
plant, with an average flow of 298,000 gallons per day in 2023. The combination of Inflow &
Infiltration Repairs and rainfall below average, were contributors in reduced average Daily
flows. The WWTP remained in compliance for all permitted parameters, with one non-
compliant ammonia sample, and received a favorable review by NC-DENR Regional Office staff
with respect to the annual facility inspections.
IV. Certification
I certify under penalty of law that this report is complete and accurate to the best of my
knowledge. I further certify that this report has been made available to the users and
customers of the Town of Maggie Valley sewer system and that those users have been notified
Michael Mehaffey, ORC 141'
Public Works Director
Town of Maggie Valley Sewage System
/- /� n'�e'�
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