Out doing control with the patrol guys at the Utah Olympic Park. (There is some closed terrain on private property above the bobsled track that needs control work occasionally. Since this terrain is closed and on private property it sees no traffic.) We did get some other slides to move with explosives, but this slide I triggered remotely as on approach from the ridge above. I was ~75' away from the starting zone on ~10 degree slope in sparse aspens, the collapse propagated ~100' back to the guys behind and ahead to the slope. A quick look at the bed surface revealed very noticeable surface hoar. Mid elevation surface hoar is still active.