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February 24, 2012 at 11:56 AM

Propane blast at Edmonds-area plant was accident

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The explosion and fire yesterday at the Alderwood Wastewater facility near Edmonds has been ruled an accident by the Snohomish County Fire Marshal’s Office.

The explosion rocked the site at 6315 Picnic Point Road at about 11 a.m. after propane vapors ignited.

A contractor was using a crane to lift a propane tank onto a truck. The tank, which held about 300 gallons of propane, was being placed onto the metal deck of the truck when a brass drain valve on the bottom of the tank broke off, releasing propane. The fire marshal estimates that it took about 45 seconds for the vapors to ignite.

Five people suffered burns.

The explosion also damaged two buildings under construction on the property. Damage is estimated at $1 million.

Comments | More in The Blotter | Topics: Edmonds, explosion, fire

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