Little Hunting Creek Force Main Replacement Project
Project Update: November 30, 2023
Four contractors have been pre-qualified to bid on this project. As a result of a delay with VDOT issuing the land use permit, the project is currently expected to go to bid in late January 2024. Construction is expected to begin in July 2024 and be completed in Autumn 2025. In advance of the force main construction, Fairfax Water completed relocation of the 8-inch water main along Wessynton Way and the existing 6-inch water main in the Wessynton Swim and Tennis Club access road in September 2022.
The Fairfax County Department of Public Works and Environmental Services (DPWES) previously performed a condition assessment of the force main, which resulted in the need for two (2) external repairs which were performed in 2016. Due to its age, and as a result of findings during the assessment, it was determined the existing force main is nearing the end of its useful and practical life, and is in need of replacement.
A study was conducted to investigate options for replacing the existing force main. The location of the existing force main within a tidal creek and across residential properties, presents challenges for typical construction methods. Such challenges include: installation means and methods, staging and storage of materials, environmental regulations, potential time of year restrictions for site access, potential damage to the existing force main and adjacent utilities, impacts to private property, maintenance of traffic and accessibility to residences, and future operation and maintenance considerations.
After considering nine (9) potential alternatives, evaluated as part of a Basis of Design report, the selected alternative (shown in green below): minimizes environmental concerns, minimizes impacts to private properties, provides for potential nature trail improvements or amenities, and provides greater accessibility for future operation and maintenance efforts.
The existing 4,560 foot long force main, consisting of 30-inch diameter prestressed concrete cylinder pipe (PCCP) and ductile iron pipe (DIP), was constructed in the mid-1970s. It conveys wastewater pumped from the Little Hunting Creek Pump Station (located near the intersection of Thomas J. Stockton Parkway and Londonderry Road on the East side of Little Hunting Creek) which in turn collects wastewater from the surrounding community and from other upstream areas. The force main runs beneath Little Hunting Creek and through residential properties west of Little Hunting Creek, to a junction discharge chamber near the intersection of Surrey Drive and Surrey Court.
Located within the Mount Vernon District, the force main runs beneath Little Hunting Creek and through residential properties from the Little Hunting Creek Pump Station near the intersection of Thomas J. Stockton Parkway and Londonderry Road (to the east), to a junction discharge chamber near the intersection of Surrey Drive and Surrey Court (to the west). The project corridor is located across Sanitary Sewer Map Tiles 101-4, 102-3, 110-2 and 111-1, as shown below.
The project is currently expected to be advertised for construction bids in late January 2024.
Replacement of the Little Hunting Creek Force Main will:
Reduce the level and frequency of maintenance required to keep the force main operating,
Prevent costly emergency repairs,
Provide residents with safe and reliable utility infrastructure,
Enhance the quality of life for Fairfax County residents, and
Reduce risks to public health and the environment.
It is expected the new force main will serve the surrounding community for the next 50 years.
The project expected to be advertised for bids to pre-qualified contractors in late January 2024. The construction contract is expected to be awarded in Spring 2024, with construction commencing in Summer 2024. The horizontal directional drilling is expected to begin on or after November 1, 2024. Construction is expected to be completed Autumn 2025.
What To Expect
This project will be awarded to a qualified contractor or contractors through a competitive bidding process once design efforts and acquisition of easements are completed. Potential staging areas and access points off-site will be studied. All work will be supervised by Fairfax County staff. Every effort will be made to minimize disturbances and impacts to public and private areas. Careful consideration will be given to schedule construction activities to minimize interference with recreational activities. There will be no interruption to existing sanitary sewer service.
Project Cost And Funding Source
Construction of the Little Hunting Creek Force Main Project is currently estimated at approximately $8,000,000. Wastewater construction projects are funded through the county’s Capital Improvement Program.
Presentations To The Community
The project was presented during community meetings held on November 19, 2019, at Mount Vernon High School; and on December 5, 2019, at the Gerry Hyland Government Center.
The County anticipates having an additional public meeting prior to construction, to provide additional and updated information regarding construction related activities and anticipated timeframes.
Information regarding Horizontal Directional Drilling:
For more information, please email Natasha.Schmidt@fairfaxcounty.gov, Senior Engineer III, Wastewater Design and Construction Division, Department of Public Works and Environmental Services, or call 703-324-5111, TTY 711.