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Caltrans Drill Rig, Mill Creek

By Landslide Hazards Program 1997 (approx.)
Caltrans drill rig installing subsurface extensometers and pore-water pressure sensors in the Mill Creek landslide.
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Detailed Description

Photo 6: Caltrans drill rig installing subsurface extensometers (to measure landslide movement) and pore-water pressure sensors (to measure ground-water conditions) in the Mill Creek landslide. 

Sources/Usage

Public Domain.