Public Works and Environmental Services Alert:
This project is for the renewal and rehabilitation of 6,500 linear feet of 30-inch to 54-inch critical large diameter sanitary sewer pipe and associated manhole structures located in the Mount Vernon and Springfield Districts of Fairfax County. The renewal method was selected as trenchless rehabilitation using the CIPP method. CIPP is commonly used in similar applications due to its cost-effectiveness, schedule benefits and limited impact to residents and environment.
According to the National Association of Sewer Service Companies, “Hundreds of millions of feet of CIPP are in service throughout the world today, and it is considered the most widely accepted pipeline rehabilitation technology worldwide.” The project will follow all applicable industry standards, including ASTM F126, Standard Practice for rehabilitation of Existing Pipeline and Conduits by the Inversion and Curing of a Resin-Impregnated Tube as well as safety standards set by the Occupational Safety and Health Administration.
The project is in the final stages of the design phase and will be advertised for bid Spring 2024.
| Phase | Anticipated End Date |
|---|---|
| Design | Spring 2024 |
| Construction | Spring 2025-Winter 2026 |
In the current design phase, residents and trail goers might see Fairfax County Staff and their representative contractors completing non-invasive survey of the surrounding trail and trees, or completing site walks.
During the construction phase, some trails access will be limited or rerouted. There will be an initial 3-month closure of the cross-county trail for the extent of the project area. Once the work at the northern end of the project area is complete, the Cross-county trail will be reopened with the detour along Pohick Road. This detour will be in effect for a 12-15 month duration while the remaining rehabilitation is completed on this segment of the project. See temporary closure map for reference.
As part of this work, the sanitary sewer flow will need to be by-passed for the rehabilitation to take place under dry pipe conditions. A series of by-pass pumps, and piping will be installed above ground reroute the sewer flow to a discharge manhole located in the vicinity of Wadebrook Terrace. See the photos below for an example of this setup. Notifications for this work will be updated on the website as well as shared on the Fairfax County Park Authority page. Trail closure and projects signs will also be posted in the Pohick Stream Valley Park.
The engineer’s preliminary opinion of the cost for this project is $14 million and it is being fully funded through sewer service charges from existing customers and availability charges, which are one-time fees for the initial connection to the system. No tax dollars are funding these improvements.
For more information, please email Sara Ferrance, Engineer IV Fairfax County Wastewater Collection Division at sara.ferrance@fairfaxcounty.gov or call our residential wastewater 24-Hour Customer Communications Center 703-323-1211 | TTY 711