The project is currently in the land acquisition stage and easements are being acquired. The Engineering is developing 95% Design plans and construction documents. Contractors will be pre-qualified to bid on this project, with the project expected to go to bid in late 2022. Construction is expected to begin in early 2023 and be completed by Spring 2024. In advance of the force main construction, Fairfax Water will be relocating the 8-inch water main along Wessynton Way and the existing 6-inch water main in the Wessynton Swim and Tennis Club access road. This water main relocation work is planned to be performed in May this year.
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 Est 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 in the 95% Design phase.
Replacement of the Little Hunting Creek Force Main will:
It is expected the new force main will serve the surrounding community for the next 50 years.
The project is currently in the 95% Design Phase. Contractors will be pre-qualified for this project in Spring 2022, with the project expected to be advertised for bids to pre-qualified contractors in late Summer 2022. The construction contract is expected to be awarded in late Fall 2022, with construction commencing in early 2023. Construction is expected to take approximately seventeen (17) months to complete; therefore, construction is expected to be complete in late Spring 2024.
This project will be awarded to a qualified contractor or contractors through a competitive bidding process once design efforts are completed. Potential staging areas and access points off-site will be studied. All work will be supervised by Fairfax County staff except for the water main relocation work, which will be managed by Fairfax Water. 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.
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.
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 as the design progresses, to provide additional and updated information regarding construction related activities and anticipated timeframes.
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.
12000 Government Center Pkwy
Fairfax, VA 22035