Public Works and Environmental Services

Fairfax County, Virginia

CONTACT INFORMATION: Our administrative offices are open to the public at this time. Appointments are preferred. Please call or email 8 a.m. - 4:30 p.m., Monday – Friday

703-324-5033
TTY 711

12000 Government Center Parkway
Suite 448 Fairfax, VA 22035

Christopher S. Herrington,
Director

Tysons West Wastewater System Enhancements

Project Update: February 4, 2021

This project is in the planning stage, also called the preliminary engineering phase. The county is evaluating the pump station design and the routes for the gravity and pressurized sewer pipelines. Route possibilities and design concepts will be shared with key stakeholders for their input prior to final decisions. This page will include the results of those conversations when available.

Project Background

Tysons is transforming into Fairfax County's "downtown," where people live, work and play. This area is planned to become a green urban center with new streets, sidewalks and bike paths. It is estimated that by 2050, Tysons will host 100,000 residents and 200,000 jobs. The full vision for Tysons is presented on the Tysons Partnership website. To support this vision, utilities are expanding and upgrading their services to provide power, communications, and water and wastewater collection services.

The Fairfax County Department of Public Works and Environmental Services, which is responsible for wastewater collection and treatment in this area, is working on new wastewater infrastructure to collect and treat the additional wastewater that is anticipated to come from the Tysons area.

The expansion of the wastewater infrastructure in the Tysons area will ensure continuous and reliable wastewater service to the residents and businesses located in and around Tysons.

The wastewater is collected from individual buildings, businesses, and facilities and flows through the sewer lines underground to the lowest points in the area, where pumps are used to move the wastewater to higher points through a pressure sewer (also called a force main) to the Noman M. Cole Pollution Prevention Plant in Lorton, Virginia, approximately 20 miles away.

Project Description and Location

There are three main components to this long-term project: the gravity sewer collection system; the pump station; and the pressurized (force main) sewer collection system.

Gravity Sewer

To accommodate the higher volume of wastewater generated by the development in the area, approximately 9,200 feet (nearly two miles) of new sewer pipe will be installed in the area. Some of the existing pipes will need to be enlarged, relocated, or replaced, while other pipes will continue their service without modifications.

Pump Station

The existing pump station must be replaced with a new, larger facility. The current station was constructed in 1969 and can handle only one million gallons per day of wastewater. The new pump station will pump up to 25 million gallons per day to the Noman M. Cole Pollution Prevention Plant.

Illustration - Tysons Pump Station
The existing Tysons Dodge pump station will be replaced.
 

The new pump station will be located in the northern part of the Tysons area in the vicinity of the Spring Hill Metro Station. We anticipate some of the new pipe work will extend west from this point. The new pump station building will be a state-of the-art facility with energy efficient pumps, odor and noise control, and emergency back-up power. The building will be designed to fit into the community with appropriate landscape and electrical equipment.

Force Main

Approximately 30,000 feet of new force main (about 5.5 miles) will be installed to transport the additional wastewater to the Noman Cole Pollution Prevention Plant for treatment. Several routes are being evaluated for this 36-inch new pipe.

Timeline

Planning Spring of 2020 – Winter of 2020
Design Winter of 2020 – Summer of 2022
Permitting Summer 2020 – Spring of 2023
Construction Spring of 2022 – Spring of 2024

 

What to Expect

The county will communicate with all impacted property owners and businesses well in advance of construction and will make every effort to mitigate issues and reduce impacts to the community.

This project is in the Difficult Run Watershed and the Providence Magisterial District.

Area residents, business owners, and other key stakeholders located close to the pipe routes in consideration by the county will be invited to hear presentations and provide input to the pipe route selection process in 2021. Once that’s completed, these stakeholders and the larger community may not hear much about this project until the construction phase (2022-2024) begins. The pipeline construction will take 18 to 24 months. The exact timing is unknown at this time and can be impacted by several factors including the selected pipeline routes. It is estimated that construction impacts will last for only a few days in one location along the pipeline as the work progresses quickly. Some of the construction will be performed using trenchless methods to reduce the impact to roads and traffic.

Area residents, business owners and other key stakeholders located near the pump station site will receive information about construction impacts (noise, parking, traffic changes) during the pump station design phase. The pump station construction will take 18 to 24 months starting in 2022.

Project cost and funding source

The engineer’s preliminary opinion of the cost for this project is $110 million and it is being fully funded through new connection fees. No tax dollars are funding these improvements and there will be no impact to the rates existing customers pay for wastewater service.

Presentations to the community

The key impacted stakeholders to this project will be consulted on the pipeline route options in 2021 and they will be communicated with throughout construction (2022-2024).

Contact

For more information, please contact the project manager Agata Fallonor call 571-230-8269, TTY 711.

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