Seattle— DBM Contactors Inc. recently completed the shoring for the excavation and permanent foundation walls of the full-block, below-grade parking garage on the Harborview Bond Project — Ninth and Jefferson Building.

Funded by a portion of $193-million bond measure that was voted in by King County residents in 2000, this building will include a five-story clinical research building above the garage. Turner Construction Co. is the general contractor.

The shoring, which required working around a tunnel under Jefferson Street, involved installing 1,680 soil nails, 156 tons of reinforcing steel and 48,000 square feet of permanent top down shotcrete facing. In addition, DBM installed 16 36-inch-diameter and two 48-inch-diameter drilled shaft foundations with depths to 30 feet. These shafts were installed after the perimeter shoring walls reached the final bottom of excavation at a depth of up to 64 feet.