Lake Chabot Road
Repair and Stabilization Update
Facilities & Transportation Committee Meeting
July 5, 2023
History of movement
Downslope Slide
(A-line)
Upslope Slide
(Astor Court)
B-line Stabilization C-line Stabilization
Adjacent Property / Responsibility for Repair
Private property
13.7 acre
Cal Engineering + Geology
selected consultant
• Firm Established in 1993
• Extensive relevant experience with
road stabilization projects
Palomares Road
Emergency Landslide Repair
Vasco Road
Safety Improvements
Rifle Range Road
Stabilization Project
Cal Engineering + Geology
1750 linear feet
of seismic
refraction
Mapped
bedrock
elevation for
83% of roadway
length
• Investigative approach to the work
Cal Engineering + Geology
• Depth of bedrock plotted
• Sound waves faster through denser material
Downslope Stabilization Locations
A-line Stabilization
B-line Stabilization C-line Stabilization
Road Surface
Upslope Repair Cross Section
• Retaining wall
• Reduced slope of
embankment
Action
Description Cost Funding Funding needed
Upslope Repair $1,250,000 $1,000,000 $250,000
Downslope Design $ 200,000 $200,000
Total $1,450,000 $1,000,000 $450,000
Work must be done by Nov 2023. Standard bid will require 5 months putting construction into the wet season.
Seeking recommendation to City Council on two items:
Additional funding request. 75% of repair costs are likely to be reimbursed by FEMA.
Declare upslope repair to be emergency work, waive standard bidding process to save time