DORE, J.
This appeal arises from a dispute which erupted between two insurance companies and their insureds following the May 18, 1980, explosion of Mount St. Helens. The early pyroclastic flows from the eruption, along with hot ash and debris, began melting the snow and ice flanking the mountain and the broken glacial ice blocks within the Toutle River valley. This water, combined with torrential rains from the eruption cloud, existing groundwater, water displaced...
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