HRSD Kiln Creek / Route 171 Interceptor Force Main. York County, Virginia.
The Kiln Creek/RT 171 IFM project includes a total of approximately 32,000 LF of 24 through 42-inch interceptor force mains, as well as a dozen large diameter guided jack/bore trenchless road crossings; a 36-inch OD 1,000 foot long horizontal directional drill (HDD) installation and 42, 30 and 24-inch line stops and raw sewage bypass line installations to complete the required tie-ins and connections. The project included relocating approximately 1,500 LF of existing 24-inch force main out of backyards to minimize impacts to residents in the event of a future leak or break. Design included developing a preliminary site plan and yard piping layout for the future Tabb pressure reducing station (PRS) west of Big Bethel Road. Work included installation of approximately 1,200 LF of 12-inch force main along Yorktown Road to abandon 3,300 LF of asbestos-cement pipe.
Services Performed
Project Highlights
Force Mains
New interceptor force main layouts were designed to minimize impacts to private property and to pedestrian and vehicular traffic; to avoid wetlands and environmentally sensitive areas; and to facilitate access for operation and maintenance staff.
Geotechnical
WRA conducted subsurface investigations and provided recommendations for trenchless road crossings and for the 1,000 LF horizontal directional drill installation through a narrow (20 foot wide) neighborhood common area in close proximity to residences to avoid impacts to a cypress swamp.
Structural
WRA worked with geotechnical and civil/utility engineers to design thrust restraint for large diameter line stops to ensure the adequacy of the installation for temporary flow bypassing requirements during tie-ins to existing lines.