Dunn-Erwin Road Area 14-inch Waterline Abandonment and E. Wake Street Waterline Rehabilitation Project
Funding Agency: NC Division of Water Infrastructure State Revolving Fund
Budget: $963,325
Estimated Completion Date: July 2022
This project will replace aged water distribution infrastructure within two areas of the City of Dunn. The first part of the project will abandon an existing 14-inch waterline and it will be replaced with 6-inch and 8-inch line segments. The 14-inch waterline was originally installed in the early 1900’s and once was the primary transmission main from the City’s water treatment plant in Erwin. The project limits will encompass the intersection of Bruce Drive and Erwin Road and will extend to down to the intersection of South Wayne Avenue and West Cumberland Street. The second part of the project will abandon an existing 2-inch galvanized waterline and replace with a 6-inch waterline along East Wake Street from Carolina Drive to East Johnson Street. This waterline is in constant need of repairs by the City and is unable to provide fire flow to the surrounding area. Therefore, by upsizing to a 6-inch line fire flow can be provided and hydrants can be installed.
Black River Wastewater Treatment Plant Improvements
Funding Agency: NC Division of Water Infrastructure State Revolving Fund
Budget: $3,260,000
Estimated Completion Date: February 2025
The Black River Wastewater Treatment Plant (WWTP) was originally constructed in the late 1970’s and was last updated in 2020 with the replacement of aeration system. The WWTP’s biological process is a conventional single stage activated sludge process and is permitted for 3.75 Million Gallons per Day (MGD). A 2009 project upgraded the influent pump station and preliminary treatment facilities to handle up to 15 MGD peak hourly flow. The new influent structures and piping were sized to provide 10 MGD permitted capacity.
The Black River WWTP is subject to rainfall induced inflow and infiltration (I&I) and has experienced several Sanitary Sewer Overflows (SSOs) on the interceptor line upstream of the WWTP. As a result of these overflows and the inability to treat the wastewater coming into the plant, the City of Dunn is currently under a system wide moratorium preventing new connections to the sewer system. Improving the internal plant piping, clarification, and disinfection to accommodate a higher peak flow will allow the City to treat more wastewater before overflows occur, therefore reducing the number and volume of SSO’s.
The City of Dunn has received funding from the NC Division of Water Infrastructure for the design and construction of mechanical and structural upgrades that will increase the WWTP’s hydraulic capacity, improve clarification, improve the disinfection process, and position the treatment plant for a future expansion. The upgrades will include a new clarifier distribution chamber, refurbish an existing clarifier (built in 1996) with a new mechanism, weirs, and baffles, construct an additional clarifier to better process peak flows, improve disinfection by constructing a new chlorine contact basin to provide adequate volume to meet the 10 states standards, and improve hydraulic capacity by replacing undersized process piping (built in 1982).
USDA Phase 1 Sewer Line Rehabilitation Project
Funding Agency: USDA
Budget: $2,636,000
Estimated Completion Date: December 2022
The City of Dunn sewer collection system consists of over 75 miles of sewer lines ranging in size from 8-inches to 30-inches. Many sewer lines throughout the City were originally constructed during the period of 1920-1960 and were made of short, four-foot sections of vitrified clay (VC) pipe. The joints were constructed of cement mortar and have deteriorated with time. The manholes that have been inspected through various system evaluations which show evidence of infiltration of groundwater through deteriorated joints and cracks. As a result of the deteriorated infrastructure, inflow and infiltration (I&I) or unwanted groundwater and/or rainwater makes its way into the collection system and eventually ends up at the wastewater treatment plant.
The City’s wastewater system is subject to rainfall induced inflow and infiltration (I&I) and has experienced several Sanitary Sewer Overflows (SSOs) on the interceptor line upstream of the WWTP and at Eastside Pump Station. As a result of these overflows and the inability to treat the peak wastewater coming into the plant, the City of Dunn is currently under a system wide moratorium preventing new connections to the sewer system. Improving the wastewater collection system and reducing the I&I flows will therefore reduce the number and volume of SSO’s.
After completing the project, the wastewater system will become more efficient by reducing the flows through the pumping stations and the treatment plant. By reducing the flows through the facilities, the pumps will not run as often, therefore will decrease the amount of energy being used to operate the system. The treatment plant will also save on chemical costs associated with treating I&I diluted wastewater flow.
This rehabilitation project will replace or rehab approximately 9,135 linear feet of sewer line, 42 manholes, and 142 services on the following streets: S. Powell Avenue, Dunn-Erwin Road, Carolina Drive, Clinton Avenue, Best Street, Joy Street, Sue Avenue, and Commerce Drive.
Community Development Block Grant Infrastructure (CDBG-I) Sewer Line Rehabilitation Project
Funding Agency: Division of Water Infrastructure
Budget: $1,999,129
Estimated Completion Date: August 2024
The City of Dunn sewer collection system consists of over 75 miles of sewer lines ranging in size from 8-inches to 30-inches. Many sewer lines throughout the City were originally constructed during the period of 1920-1960 and were made of short, four-foot sections of vitrified clay (VC) pipe. The joints were constructed of cement mortar and have deteriorated with time. The manholes that have been inspected through various system evaluations which show evidence of infiltration of groundwater through deteriorated joints and cracks. As a result of the deteriorated infrastructure, inflow and infiltration (I&I) or unwanted groundwater and/or rainwater makes its way into the collection system and eventually ends up at the wastewater treatment plant.
The City’s wastewater system is subject to rainfall induced inflow and infiltration (I&I) and has experienced several Sanitary Sewer Overflows (SSOs) on the interceptor line upstream of the WWTP and at Eastside Pump Station. As a result of these overflows and the inability to treat the peak wastewater coming into the plant, the City of Dunn is currently under a system wide moratorium preventing new connections to the sewer system. Improving the wastewater collection system and reducing the I&I flows will therefore reduce the number and volume of SSO’s.
After completing the project, the wastewater system will become more efficient by reducing the flows through the pumping stations and the treatment plant. By reducing the flows through the facilities, the pumps will not run as often, therefore will decrease the amount of energy being used to operate the system. The treatment plant will also save on chemical costs associated with treating I&I diluted wastewater flow.
This rehabilitation project will replace or rehab approximately 13,625 linear feet of sewer line, 56 manholes, and services.
