A landslide occured on August 6 near Pemberton, BC, Canada. Some are calling it the second largest in Canadian history
http://www.vancouversun.com/news/Officials%20assess%20further%20dangers%20from%20Pemberton%20landslide/3372695/story.html
Spot on!
Doing 50 nuclear densometer tests takes a few hours if you are not just backscattering. Doing 1000 'probe tests' takes the same amount of time. The younger guys at my work (including me) tend to probe around a site followed by nuke testing in areas of interest.