Starting in 2014, CTS has provided civil and structural engineering services for Walls Property Management, in connection with their proposed new apartment development at the lower end of a steep cul-de-sac. The challenge was to design a new “turnaround” that met City of Seattle (SDOT) requirements.
The City required that space be provided for an SU-30 vehicle to be able to turnaround. CTS determined that it was necessary to widen the existing roadway by 4 feet, and install a modified hammerhead turnaround within the proposed driveway of the new building.
In order to accommodate this road widening, CTS designed a new reinforced-concrete retaining wall, with a concrete traffic barrier built into the top of the wall. Utility work includes an 8” water-main extension, sewer and stormwater connections, a stormwater-detention vault, and street lighting modifications.