McNutt Creek Wastewater Interceptor Project, Phase 1

Completed in 2007 by Mole Constructors, the McNutt Creek Wastewater Interceptor Project, Phase 1 project consisted of approximately 8,350 linear feet of 48-inch diameter wastewater line ranging from about 30 to 55 feet deep. The vertical alignment placed the crown of the finished interceptor about 10 feet below the McNutt Creek bed and about 21 feet below the Chandler Creek bed. The North terminus of the alignment provided wastewater service for future connection of planned development of the north. The South terminus of the interceptor consisted of an approximately 60-foot lift station constructed west of the Brushy Creek Wastewater Treatment Plant. The entire length of the interceptor was installed using trenchless tunneling techniques. Tunnel excavation was performed via a lovat 84-inch Tunnel Boring Machine (TBM). The initial tunnel support consists of rock dowels. The shafts were supported with liner plate within the soft ground, and rock dowels, welded wire fabric and shotcrete within the rock. A 48-inch diameter Hobas pipe was installed in the tunnel and light weight cellular grout was installed in the annulus.