TagConveyor(27)

A Lynnwood contractor proposed using conveyor belts instead of trucks to haul the 23 million cubic yards of fill dirt needed for Sea-Tac Airport's third runway construction in the late 1990s. The plan would have barged dirt to Des Moines, then carried it 2.5 miles to the airport via belt, cutting the estimated haul time from five years to two and a half. Des Moines residents, already angry about the runway routing air traffic over their downtown, reacted skeptically and accused the contractor of trying to bribe the city with promises of new parks in exchange for cooperation.

HNTB-prepared Final Draft Phase I study (November 1996) for Sea-Tac Airport Third Runway fill material alternative delivery methods. Evaluates transport corridors including Corridor 1 (Des Moines Creek barge transfer and land conveyor), Corridor 2 (SR 509 conveyor, truck, rail), and Corridor 3 (SR 518 conveyor, truck, rail). Covers technical viability, construction/environmental permitting (local, state, federal),

A 1996 Seattle Times article details the massive earth-moving challenge facing Sea-Tac Airport's planned third runway, which required importing approximately 14.25 million cubic yards of fill dirt at an estimated cost of $120 million to level a corridor of dips and valleys as deep as 145 feet. Port of Seattle planners were exploring multiple options for sourcing and transporting the dirt, including conveyor belts, barges, and rail spurs, while facing legal opposition from nearby cities who argued the project understated environmental and community harm.

In 1996, Lynnwood engineer Hank Hopkins proposed using barges and an electric conveyor belt system to transport the roughly 14 million cubic yards of fill dirt needed to build a third runway at Seattle-Tacoma International Airport, rather than relying on a constant stream of dump trucks. Hopkins argued his patented modular conveyor system would be faster, cheaper, quieter, and less disruptive to surrounding communities than the truck-based approach outlined in the environmental study. The city of Des Moines, which opposed the runway project, was seen as the primary obstacle to approving the conveyor plan, as the system would require city permits that trucking would not.