Langley School Pump Station and Force Main Project – Phase 2 – Chain Bridge Road Gravity Sewer Capacity Improvements
Project Number: WW-000001-024
Project Update: March 28, 2023
Spot repairs for defective work that occurred during Phase 1 will be implemented by the Contractor as soon as April 3, 2023. See community notice.
Construction for Phase 2 continues along Chain Bridge Rd and Ballantrae Ln. Phase two consists of updating the pumps at the pump station to ensure the capacity of the downstream gravity sewer is maintained, as well as gravity sewer improvements along Chain Bridge Rd and Ballantrae Ln. The objective is to replace the existing gravity sewer pipe that runs under sections of Chain Bridge Rd and Ballantrae Ln with a larger diameter pipe in the same location to accommodate higher flows. In addition, upon successful completion of the gravity sewer along Chain Bridge Road, the existing Force Main shall be abandoned in place.
2011 Force Main Condition Assessment Report:
The forcemain was identified in need of rehabilitation / replacement by a 2011 condition assessment. The pump station has pumps from 1994 that are corroded and are at the end of their useful life.
2019 Comparison of Alternative Force Main Alignments:
In August 2019, DPWES completed a preliminary study to compare five (5) forcemain routes. Five (5) replacement alternatives were evaluated for Langley School forcemain which were based on using Horizontal Directional Drilling (HDD) or open cut. HDD is a trenchless form of pipeline replacement while open cut is the most common method of installing a new pipe.
2020 Preliminary Engineering Report:
In June 2020, DPWES started looking at refining the recommended option to determine if this recommended route is feasible. If we find that this route is feasible, we will seek the community’s input in a virtual meeting.
The overall project description will include the complete replacement of the existing 0.42 MGD pump station. Most all the mechanical equipment is over 20 years old and is highly corroded. The existing electrical building is a little undersized to hold the new modern-day mechanical equipment. We also are planning to install a new fence, repave the access road and plant some trees to help “hide” the pump station. The forcemain is quickly reaching the end of its useful life and needs to be replaced.
We are planning to abandon the old forcemain and install a new forcemain along the Fairfax County School Property, then along Georgetown pike and into Langley Lane to its new discharge point.
The project is located to the east of Langley High School and extends along Georgetown Pike.
This is a multi-phase project planned to take place over several years.
Phase one consists of building the new force main and increasing the capacity of the gravity sewer on Langley Lane.
Phase two consists of updating the pumps at the pump station to ensure the capacity of the downstream gravity sewer is maintained, as well as gravity sewer improvements along Chain Bridge Rd and Ballantrae Ln. The objective is to replace the existing gravity sewer pipe that runs under sections of Chain Bridge Rd and Ballantrae Ln with a larger diameter pipe in the same location to accommodate higher flows. In addition, upon successful completion of the gravity sewer along Chain Bridge Road, the existing Force Main shall be abandoned in place.
Phase three consists of replacing the pump station and electrical buildings.The project is currently in phase one with construction of the force main and gravity sewer on Langley Lane expected to be complete Summer 2022.
Phase 2 has design plans ready for construction and public review, with a community meeting scheduled in June 2022.
It is expected the new pump station and force main will serve the surrounding community for at least the next 50 years.
Replacement of the Langley Pump Station and 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, reliable utility infrastructure
Enhance the quality of life for Fairfax County residents
Reduce risks to public health and the environment
Public Input and Open Discussion on Phase 1
Begin Construction on Phase 1
Public Input and Open Discussion on Phase 2
Begin Construction on Phase 2
What to Expect
This project will be awarded to a qualified contractor 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. 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
The total project estimate is expected to be approximately $3.4 million. As of January 25, 2019, funding in the amount of $9,631,000 is currently available in Fund 690C69300, Project Number WW-000001-024, to fund this project. The Langley School PS Project is included in the FY 2021 – FY 2025 Adopted Capital Improvement Program (with Future Fiscal Years to 2030) identified as the Sanitary Sewer Replacement, Rehabilitation and Reinvestment Program.
For more information, please email email@example.com Engineer II, Wastewater Design and Construction Division, Department of Public Works and Environmental Services, or call 703-324-5111, TTY 711.