City: Phoenix
State: Arizona
Owner: City of Phoenix Water Services
General Contractor: Hunter Contracting

Project Description:
Schnabel was contracted to design and construct over 11,000 square feet of secant pile shoring for the repair and upgrade of an existing and active water treatment plant.  The secant pile shoring system was designed to limit deformation and protect the existing critical treatment plant facilities during the construction of the new facilities.  The system was comprised of 179 interlocking 36-inch diameter drilled shafts that were tiedback with two rows of tiebacks through continuous walers.  Overall, 158 tiebacks up to 50 feet long were installed.  The design supported excavation heights of up to 25 feet.