ANACORTES, Wash. -- From 500 yards away, John Moore felt the concussion before he heard it.
Moore was midway through a 6 p.m.-to-6 a.m. shift as an operator at the Tesoro Corporation's oil refinery in Anacortes, an island town 80 miles north of Seattle. It was 35 minutes after midnight on April 2, 2010.
Up the hill from Moore, in the Naphtha Hydrotreater unit, seven workers were restoring service to a bank of heat exchangers -- radiator-like devices containing flammable hydrocarbons, that had been gummed up by residue and cleaned. Most of the workers didn't need to be there; it was, for them, a training exercise.
Moore was monitoring the job by radio. "They were maybe tw