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DART held its first major all hands earthquake exercise in the spring of 1990. Preparation for the exercise was extensive. It required digging a 12-foot deep 60-foot long trench. Because of the high water table, the trench would end up with two feet of water during high tide. The trench was filled with debris including a refrigerator and tons of concrete. Because of the unstable trench walls, the exercise had significant actual hazards that had to be dealt with. The evolution lasted well over 12-hours.
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