This is a very telling example of just how intrusive that ash was, and still is really. About two years after the mountain blew, I remodled my cousins home in Tieton, Washington, about 70 miles East of the mountain. During the remodel, I removed and replaced the ceiling in her basement. I found a quarter inch of the ash laying on top of the ceiling boards, that were sandwiched between the floor above and the ceiling below. I was astounded that the ash permiated that far. Bob