Which Green Lake and Ravenna neighborhood residents would potentially be sheltered apparently depended on how fast they reached the shelter's door. Planners assumed that those seeking shelter in the event of an attack would need to stay there for up to two weeks. In addition to emergency supplies, the shelter housed radiological testing devises. The shelter was covered with 4 1/2 feet of backfill and 429 tons of sand to protect shelterees from radiation. Once shelter construction began, contractors were given 120 days to build it, so as not to delay freeway construction. and planning and assistance to local government in their achievement of total disaster preparedness." On January 31, 1961, the engineering firm of Andersen Bjornstad Kane completed plans for the shelter under the Seattle Freeway. The Federal Civil Defense Act of 1950 and an Executive Order mandated an "effective and viable civil defense program.
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