Public Works and Environmental Services

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Carey Needham
Director, Capital Facilities

Pohick Large Diameter Rehabilitation Phase II

Project Number: WW-000028-44

Project Update: February 16, 2024

This project is in the 70% Design Phase and is approaching the 95% Design Phase.

Project Background

The Fairfax County Wastewater Collection Division (WCD) owns and operates over 3,400 miles of gravity sewer and associated manholes (MH) throughout Fairfax County. There are various manholes along the sewer line that allow access for servicing and it is up to the WCD to ensure that maintenance is upkept. The most accessible one is past the cul-de-sac on Wadebrook Ter. Dewberry was tasked with the objective to provide recommendations to rehabilitate the sewer tunnel.

Project Description

The primary goal of this project is to rehabilitate the manhole near the cul-de-sac of Wadebrook Ter to allow easy access for future repairs, and to repair the interior of the sewer pipes while restrengthening them with a layer of lining to protect the system from future damages.

Project Location

map - Pohick Tunnel

This project is located primarily along Wadebrook Ter and has the manhole in between the cul-de-sac and Pohick Creek. This project is in the Mt. Vernon magisterial district.

Project Phase

Design Phase - This project is in the 70% Design Phase and is approaching the 95% Design Phase. Specifications, drawings, and updated schedules will be submitted and revamped in this phase.

Project Benefits

Benefits Reason
Infrastructural Longevity Helps extend the lifespan of the sewer infrastructure
Prevent System Failures Protects against aging, leaks, collapses, and blocking
Improved System Performance Enhance flow capacity, reduce risk of clogs, and improve efficiency
Environmental Protection Prevent untreated water from entering water bodies
Cost Saving Reduce emergency repairs


Design is anticipated to be complete early 2024. Construction timing is dependent on stakeholders and bidding services but is expected to start in Spring 2024 and finish in Summer 2024.

Phases Dates
Beginning of Design 5/15/2023
35% Design Submission 9/11/2023
70% Design Submission 12/8/2023
Community Planning Meeting 1/23/2024
90% Design Submission 2/2/2024
Final Design Submission March 2024
Construction Start Summer 2024

Presentations to the Community

Pohick Interceptor Rehabilitation Project – Community Meeting, January 23, 2024

What to Expect

During the design phase, officials may be in the area to for surveying purposes. During the construction phase, the trail that starts from the cul-de-sac will be blocked off but the other path will remain open. Expect flagging and survey markers past the end of the cul-de-sac and all along Wadebrook Ter. Once construction begins, access and deliveries will enter the site from proposed access points from Pohick Rd. he typical work week is Monday through Friday starting after 7 a.m. Note that at some periods during construction, work may occur on weekends. Construction activities on weekends would occur after 9 a.m. These start times are in accordance with the Fairfax County Noise Ordinance.

Project Cost and Funding Source

The rehabilitation of the Pohick Sewer Tunnel will be funded for approximately $2,000,000. Funding for construction is dependent upon future budget availability and allocations. The cost will be further defined at the 90% Design Phase.


For more information, please email Matthew Doyle, Project Manager, Fairfax County Wastewater Collection Division at

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