Christopher F. Johnson, P.E., G.E. White Point Landslide City of Los Angeles White Point Landslide Bureau of Engineering October 22, 2013 Eng.lacity.org
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
Completed Interim Grading
Completed Interim Grading
Horizontal Drains-Drilling
Horizontal Drains-Plan
Work and Containment Areas
Work and Containment Areas
Horizontal Drains - Discharge Containment
Ground Anchors – Plan View
Ground Anchors – Cross Section
Tree Groundwater Well and Instrumentation Map
Groundwater Data Table NOVEMBER 2011 - OCTOBER 2013
Groundwater Piezometric Levels February 2013 - October 2013
DRAIN LOCATION PLAN
DRAIN FLOW RATES GALLONS PER MINUTE
Inclinometer Data Table JANUARY 2012 - OCTOBER 2013
Crack Gauge West of B-7
Traffic Counts
Street Improvement Plans
Schedule For Immediate Repairs • DEWATERING IMPROVEMENTS – 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
• Residents and visitors are warned to keep out of the closed-off area. • Final Geotechnical Report can be viewed at the following website: http://eng.lacity.org/whitepoint/whitepointlandslide.htm
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
No further work other than Immediate Repairs
OPTION 1 – Restore Roadway to Previous Location Without Retaining Wall - $43.8M
OPTION 2 – Restore Roadway to Previous Location With Retaining Wall - $28.8M
OPTION 3 – Restore Roadway to Previous Location With Bridge - $51.3M
OPTION 4 – Regrade Roadway - $6.7M
OPTION 5 – Reroute Roadway - $6.9M
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