McKillop Road, Oakland, California
In 2006 a large catastrophic landslide destroyed one home and threatened to cut off the only public access to 12 others. To address the emergency situation, Cal Engineering & Geology was retained by the City of Oakland to complete a geologic and geotechnical study, and prepare plans, specifications, and engineer’s estimate to stabilize the roadway. The initial scope of work included historical research, geologic mapping, and monitoring of crack gauges and other points of measurement near the headscarp. CE&G completed preliminary geologic mapping to assess the boundaries and direction of movement; developed and evaluated repair alternatives to protect the public facilities and the public right-of-way; and completed design of a drilled pile and tieback road embankment stabilization system. Due to subsequent right of entry issues on the private property, modifications were made which allowed for construction activity limited only to the City’s right of way. A two-wall system was used in which the first wall with tieback anchors was constructed below the center of the roadway and a second wall connected with tie rods at the edge of the right of way. During construction, CE&G provided engineering observation, inspection, and testing services. Changes were made to the design during construction based on conditions encountered after logging the deep stabilization piles. The Federal Emergency Management Agency (FEMA) funded project was completed at a cost of approximately $3 million and was an award winning project.