Severe winter rainstorms caused a landslide across Ygnacio Valley Road and the damage forced closure of one lane of the major arterial. The City of Concord engaged CME to manage the design and construction of emergency repairs. The project required adherence to Caltrans Local Assistance Procedures and development of a project-specific Quality Assistance Plan. CME worked with the City to obtain a grant for the emergency repair and managed the construction.
In a follow-on project, CME worked with the City to obtain funding from Caltrans and FHWA for permanent stabilization and repair of the hillside roadway. The permanent restoration project involved the construction of CIDH piles, underground soldier pile and tieback wall system to protect the road from future landslides, pavement reconstruction, earthwork to improve drainage conditions, and measures to protect native wildlife. All lanes of traffic were required to remain open during construction. A lengthy NEPA approval process, including 4(f) clearance, was required for the City to use non-emergency federal funds. The project was completed on time and under budget. CME staff managed all federal funding requirements for the project. FHWA audited the project and CME was commended for thoroughness and completeness.
Construction cost was $4.6 million–$1.3 million for emergency opening and $3.3 million for permanent repairs.
City of Concord
2006 - 2011