The Ministry of Transportation
and Infrastructure is pleased
to welcome you to the public
information session for:
Highway 99
Ten Mile Slide
Project Development
Your comments are
appreciated
Welcome
Background Information
• Slide activity documented since 1988
• Ten Mile Slide is part of the larger Tunnel Earth
Flow
• Two major highway realignments (1989 & 1995)
• MoTI removed paved surface in 2007
• MoTI installed 70m shear key test section in 2011
• 4 stabilization options shortlisted in Spring 2016
• Preferred stabilization option was selected in
Fall 2016
Traffic Data
• Approximately 1,560 vehicles per day
• 19% heavy vehicles (~300 per day)
• Peak traffic volumes of 75 vehicles per hour
• Traffic is currently required to slow to 30km/h
through the 800m slide zone
Risks & Safety Issues
• Unusual risks and safety issues for this section
include:
o Active slide zone
o Uneven gravel surfaces and shoulders
o Lack of shoulder width
o Unprotected steep embankments
o Lack of lane delineation
Extraordinary Maintenance
• Maintaining the highway through the slide zone
costs approximately $240K annually
Slide Movement
Observations since documenting the slide:
• The slide crest retrogresses up the hill about
7m/year on average
• Average movement rates are 6-7mm/day at the
highway
• Accelerated movement was noted in:
o Fall 2013
o Fall 2016
8 day full closure (Sept. 27 – Oct. 5, 2016)
Movement rates peaked at 25mm/hr
Project Scope
• Design and install structural support to
address slope instability at Ten Mile Slide
• The proposed solution will include:
1) >400 soil anchors above Highway 99
2) Tied-back pile wall (~180 piles) below
Highway 99
3) Reconstruction and realignment of the
highway
• Emergency soil anchor installation was
completed on February 25, 2017
• Currently in design phase and seeking feedback
from key groups and stakeholders
• Restoring Highway 99 to two lanes and aiming to
remove load restrictions in Spring 2017
Current Status
Benefits
• The project will:
o Improve safety and reliability for motorists,
the trucking industry and emergency
vehicles
o Maintain the most direct connection between
Lillooet and Kamloops
o Maintain community connectivity and
cohesiveness for Xaxli’p
o Limit future costs associated with extra-
ordinary maintenance
Schedule & Next Steps
• Emergency Soil Anchor Installation – Complete
• Re-establish 2-Lane Highway – Spring 2017
• Design Completion – May 2017
• Tender Construction Contract – Summer 2017
• Project Completion – Fall 2018
Please provide your feedback
by completing a comment sheet
Thank You
Project information is available at:
gov.bc.ca/highway99tenmileslide
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