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Columbia Falls approves $5,000 change order after geotechnical review of 2nd Avenue East hillside failure
Summary
After an Alpine Geotech presentation showing a shallow slope failure driven by oversaturation and a buried fine-grained layer, the Columbia Falls City Council approved a $5,000 change order for additional lab and field tests and accepted recommendations for regrading and revegetation.
Columbia Falls — The City Council voted Feb. 17 to approve a $5,000 change order to Alpine Geotechnical Engineering to cover additional laboratory and field testing tied to a hillside failure on 2nd Avenue East.
Cliff of Alpine Geotech presented results from two sonic borings and a deeper drill hole that produced a continuous soil profile to roughly 85 feet. He said the upper 30–35 feet were dense gravel but that, unexpectedly, the team encountered fine-grained silt and clay starting around 35–40 feet. "We took a lot of samples, gathered a lot of data, put that data together," Cliff said, summarizing the field and lab work.
The firm ran direct-shear and triaxial strength tests to determine cohesion and friction-angle…
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