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Courtesy of POWER Engineers.
This hole caved in when drilling was within 5 ft of the design depth. The collapse caused the soil at the ground surface to subside from 2 ft to 4 ft at the hole location.

Bret Anderson

Bret Anderson is a principal for Northern Technologies LLC. He has more than 35 years of experience in geotechnical engineering, providing consulting on foundations for infrastructure, buildings and other civil construction projects. As the geotechnical engineer of record, he provided region-specific consultation in the design of drilled-pier and drilled-pile foundation support for the transmission line crossing extremely soft, deep fat clays of the Glacial Lake Agassiz formation. He is a professional engineer.