Non-PRO English to Portuguese Science Geology Groundwater

Hollow-stem augers are widely used for shallow environmental and geotechnical investigations. The augers are screwed into unconsolidated deposits by a rotary drilling rig, a powerful truck that can spin the augers while applying downward pressure on them. Various sampling tools and cutting bits may be lowered with a small-diameter drill pipe inside the hollow augers, which typically have an inside diameter of 4 inches. When advancing the hole, a plug bit is lowered to the bottom of the auger to prevent soil from entering the hollow-stem.