State and Island County geologists said Thursday night they believe the hillside where the massive landslide occurred south of Coupeville began to give away more than a decade ago, in 2002, and that time, water and gravity led to the inevitable event. “What happens is you’ve got this heavier, denser, dry level on top of the layer that gets wet with the clay layer and that, as that clay gets lubricated, that’s what lets the block slide,” Island County engineer Bill Oakes said.
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