Guest Post
by James L. Gordon, P. Eng. (Ret’d)
THE NORTH SPUR DESIGN
HAS NOT BEEN REVIEWED BY
MULTIPLE GEOSCIENCE
ENGINEERS!
The presence of quick clay and soft sensitive clay has been
known ever since the Spur was first investigated in 1965. Several consulting
engineering companies have looked at the Spur and issued reports on their
investigations. Many have proposed solutions to stabilize the Spur.
However, all this work can be regarded as preliminary since
the geotechnical investigations were incomplete. None of the proposed solutions
were “approved for construction”, nor intended to be. They were the first
attempts to find a suitable solution to the instability demonstrated by the
many landslides in the vicinity of the Spur, and on the Spur.
SNC have undertaken further geotechnical tests and have
developed a design which has been “approved for construction”, and has been
built.
However, the design has
not been reviewed by senior geotechnical engineers with experience in sensitive
and quick clay, contrary to the assertions of Natural Resources Minister
Siobhan Coady.
