Tysons Wastewater Conveyance Systems Modifications

“The goal of Tysons Wastewater Conveyance Systems Modifications project is to increase the size of the sewer system to accommodate the planned growth in the northern Fairfax County."

Fairfax County’s Public Works and Environmental Services design phase of this project is in progress - most recently reporting the force main design is 35% complete.

The project has been featured in FFX Now articles:

• Oct 312 2023 report on planning commission approval of a wastewater pump station.
• May 9 2022 initial project background

The project’s Preliminary Engineering Report, from March 2021, and revised in February 2022, was made available as an update on Fairfax County’s web site in August 2022.

While the project estimates “that construction impacts will last for only a few days in one location along the pipeline” the currently favored plan has work proceeding through much of TCA. Members can expect disruptions for an extended period.

Section 5.2.6 Route Alternative 6 of the Preliminary Engineering Report describes the planned path: The force main will continue 4,000 lf down Abbotsford Drive until veering right onto Rhapsody Drive. The force main will continue 400 lf down Rhapsody Drive before turning right onto a walking trail. It then will travel 900 lf on the walking trail through the park toward Riviera Drive. The force main then will travel south for 1,800 lf down Rivera Drive. It then will turn left onto Route 672 for 350 lf and then turn right, heading south down Flint Hill Road.

An excerpt from Figure 5-32 below, shows the project path on aerial imagery.

The map below shows the selected project path through TCA in more detail.

The project’s initial design for force main alignment through Tanglewood Park that preceded test borings in October 2023.

See Fairfax County’s Tysons West Wastewater System Enhancements page for background, location details, and timeline information. The slides and a recording from the May 10 meeting are currently available.