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Showing posts with label Quick Clay. Show all posts
Showing posts with label Quick Clay. Show all posts

Monday, 17 April 2017

LANDSLIDE'S AMAZING PICTURES STILL WON'T SPUR NALCOR

How did 2.2 million m³ of sand and clay that lay atop the section of the lower Churchill Valley shown in the photo below disappear? The devastated one-square-kilometre site is located across from Edward's Island — a short distance upstream from Muskrat Falls. Read on and you will find out.

Site of  landslide viewed across the Churchill River from Edward's Island
The North Spur stability problem — specifically Nalcor’s refusal to submit its "fix" for independent review — still rankles those who have followed the sad saga of the Muskrat Falls project. 

The current $11.7 billion price tag is its own testament to, among other issues, Nalcor’s incompetence. But its failure to take every precaution to ensure the dam’s integrity — having been warned of the risks, having closed the door to expert analysis — is another in its list of indictments.

The North Spur instability problem isn’t about money anymore — that ship has sailed. But four years after project sanction, an independent assessment of Nalcor’s remediation plan still eludes. 

Monday, 3 November 2014

PREMIER DAVIS: TEAR DOWN THAT WALL

Last week a retired Swedish geoscientist, industry leader, consultant, Professor, and internationally recognized expert on “Quick Clay”, Dr. Stig Bernander, spent three days studying what he described as a “live” land mass on the lower Churchill River. He was able to personally view, on the ground and from the air, a great many landslides and see physical evidence of active movement over a large area including the "North Spur". 

He spent another four days editing his notes, selecting photographic evidence and lecturing at the LSPU Hall and at Memorial University on the dangers of Nalcor relying upon “outdated” geotechnical analysis of the problem.

Quick Clays are unique, sensitive glaciomarine clays.  The clay deposits, at the North Spur as elsewhere, occurred when sea water levels were much higher.  They are unstable clays. Their peculiar characteristics are known to cause landslides.  When Quick Clay is subjected to sufficient stress, the material may liquefy. (Locally, some call the clays "pug".)

When a person of the stature of Dr. Bernander, having no connection to this Province, is troubled enough to perform this public service, pro bono, you have a right to think there is cause for concern.

Rissa slide, Norway

When the Vice-President of Nalcor, Gilbert Bennett, shows up at Dr. Bernander’s lecture at Memorial University, not to welcome the man or to acknowledge his internationally accepted engineering models for assessing landslide risk, not even to ask him a question, but only to express umbrage against the Professor, you know the Corporation has gotten far too used to not being challenged by competent third parties.