Arrowhead Contracting, Inc.

Scope Of Work

Arrowhead was awarded a competitive firm-fixed-price contract from the U.S. Army Corps of Engineers Kansas City District to construct the North Topeka Unit Flood Control Improvements project. The scope of work required the installation of 30 hydraulic relief wells adjacent to the Kansas River Levee, construction of a discharge collection system, and demolition of the existing Fairchild Pump Station at a secondary site. Arrowhead installed 30 new relief wells ranging in depth from 37 feet to 78 feet. These wells were installed using reverse-circulation drilling. The well discharge collection system was comprised of 31 precast manholes and reinforced concrete pipe (RCP) ranging in diameter from 24" to 48". The system feeds to three cast-in-place sumps, which are each drained using a trailer-mounted pump. The total length of the discharge collection system is approximately 3,800 feet, with excavations up to 11 feet deep required. The project presented numerous challenges, including construction on the levee slope and immediately adjacent to the Union Pacific Railroad, resulting in a severely constricted site. Additionally, the installation of the discharge collector system required excavation in the immediate vicinity of two buried fiber optic lines.