How Is a Port Logistics Facility in Tacoma Engineered?

The pavement design starts with the equipment, not with a standard section. The engineer obtains the terminal operator's equipment list — reach stackers, top-picks, yard tractors, loaded container weights — and designs the concrete thickness, joint spacing, and base for those loads and their repetition over the design life. Subgrade modulus comes from the geotechnical investigation; where soft fills demand it, the engineer specifies subgrade improvement or a thicker base rather than accepting premature failure. The joint layout keeps panels small enough to control cracking under the concentrated wheel loads, and dowels or tie bars transfer load across joints so faulting does not develop under channelized traffic. Grading serves operations first and drainage second. The engineer holds the yard at slopes that drain — typically one to two percent — while keeping the surface flat enough for container stacking and equipment operation. Inlets are placed to intercept flow before it crosses travel lanes, with frames and grates rated for the handling equipment. The engineer coordinates the grading with the pavement joint layout so joints do not channel water into the subgrade, and details the transitions at buildings, rails, and gates where differential settlement between structures and yard pavement is expected on fill soils.

The electrical design is built around the reefer load. The engineer runs a medium-voltage loop around the yard with unit substations feeding reefer rack rows, sizing conductors for voltage drop at the farthest plug under full diversified load. Each reefer position gets its receptacle, breaker, and metering point; the engineer coordinates the plug standard with the shipping lines the terminal serves. Yard lighting uses high-mast poles engineered for the wind exposure of the open waterfront, with lighting calculations proving the uniformity the operator's safety plan requires and cutoff optics limiting spill. Seismic resilience follows the geotechnical report. Where liquefaction is identified, the engineer designs ground improvement — stone columns, compaction grouting, or similar — beneath structures, or deep foundations that bypass the liquefiable layer. Light poles, sign structures, canopies, and gate facilities get engineered foundations and ductile detailing for the site's seismic design category. The engineer also designs the utility crossings and underground duct banks with flexible joints where they pass between improved and unimproved ground, so differential settlement in an earthquake does not sever the yard's power and communications.