Wash Borings
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| Remote-Controlled Drill Rig
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"A wash boring is a means of rapidly advancing a hole by striking or rotating, cutting, or chopping tool and by jetting with water, which is pumped through the hollow drill rod and bit. This method usually requires the use of casing. Cuttings are removed from the hole by the water circulating upward between the drill rod and casing. The cutting tool is alternatively raised and dropped by the tightening and slackening of a line wrapped around a cathead. A tiller attached to the drill rod permits the rod and cutting tool to be rotated. The material brought to the surface in the circulating water is nonrepresentative of materials in place. Consequently, positive identification of particular strata is not possible when holes are advanced by the wash-boring method."[1]
Best Practices Resources
National Engineering Handbook: Chapter 5 - Engineering Geology Logging, Sampling, and Testing, NRCS
Citations:
Revision ID: 7431
Revision Date: 07/21/2023