SLIDE 1 White Point Landslide
White Point Landslide October 22, 2013 Christopher F. Johnson, P.E., G.E. City of Los Angeles Bureau of Engineering Eng.lacity.org
SLIDE 2 Recommended Immediate Measures (Estimate $9.14 Million)
FUNDING APPROVED BY CITY COUNCIL 09/18/2012 (CF-0600-S162) and 05/28/2013 (CF-13-0469)
Status For Immediate Repairs Install additional monitoring points – Done Grade surface topography around landslide edge – Done Install series of passive drains – Done Slope anchor system – In Construction Traffic improvements – Pending Construction Schedule For Immediate Repairs Slope Anchors/Traffic Improvements Construction: May 17, 2013 – start of procurement and fabrication February 14, 2014 – all anchors installed and in-service May 30, 2014 – surface improvements complete
SLIDE 3
Completed Interim Grading
SLIDE 4
Completed Interim Grading
SLIDE 5
Horizontal Drains-Drilling
SLIDE 6
Horizontal Drains-Plan
SLIDE 7
Work and Containment Areas
SLIDE 8
Work and Containment Areas
SLIDE 9
Horizontal Drains - Discharge Containment
SLIDE 10
Ground Anchors – Plan View
SLIDE 11
Ground Anchors – Cross Section
SLIDE 12 Groundwater Well and Instrumentation Map
Tree
SLIDE 13 Groundwater Data Table
NOVEMBER 2011 - OCTOBER 2013
SLIDE 14 Groundwater Piezometric Levels
February 2013 - October 2013
SLIDE 15
DRAIN LOCATION PLAN
SLIDE 16 DRAIN FLOW RATES
GALLONS PER MINUTE
SLIDE 17 Inclinometer Data Table
JANUARY 2012 - OCTOBER 2013
SLIDE 18
Crack Gauge West of B-7
SLIDE 19
Traffic Counts
SLIDE 20
SLIDE 21
Street Improvement Plans
SLIDE 22 Schedule For Immediate Repairs
– Construction: COMPLETED
- SLOPE ANCHORS/PHASE II GRADING/TRAFFIC
IMPROVEMENTS
May 17, 2013 – start of procurement and fabrication February 14, 2014 – all anchors installed and in-service May 30, 2014 – surface improvements complete
SLIDE 23
- Residents and visitors are warned to keep out
- f the closed-off area.
- Final Geotechnical Report can be viewed at
the following website:
http://eng.lacity.org/whitepoint/whitepointlandslide.htm
SLIDE 24 Summary of Options
- Abandon Roadway – Only interim repairs done
- Restore Roadway Without A Retaining Wall
- Restore Roadway With A Retaining Wall
- Restore Roadway With A Bridge
- Regrade Roadway
- Reroute Roadway
SLIDE 25
No further work other than Immediate Repairs
SLIDE 26
OPTION 1 – Restore Roadway to Previous Location Without Retaining Wall - $43.8M
SLIDE 27
OPTION 2 – Restore Roadway to Previous Location With Retaining Wall - $28.8M
SLIDE 28
OPTION 3 – Restore Roadway to Previous Location With Bridge - $51.3M
SLIDE 29
OPTION 4 – Regrade Roadway - $6.7M
SLIDE 30
OPTION 5 – Reroute Roadway - $6.9M
SLIDE 31
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