San Pablo Creek Slope Stabilization Project
A large landslide adjacent to San Pablo Creek in the City of Richmond, CA created public safety and public access issues, increased flood risk, compromised local roadway, and had the potential to continue to damage multiple utilities. To design and construct an emergency access road, NCE quickly got to work completing field investigations, evaluating slide mass characteristics, and monitoring ongoing movement. Once this was complete, NCE undertook a full alternatives analysis, conducted regulatory agency consultations and permitting, environmental documents, completed hydrology and hydraulics, and developed the final design to stabilize the landslide by placement of a large toe buttress in the creek channel and a large 26-foot-wide box culvert to convey creek waters. and initiated design of a reconstructed road that would feature stable slopes and drainage and protect nearby homes and utilities.
The final design also included a number of habitat protection and mitigation measures including a meandering streambed and skylights within the culvert for fish passage, bioengineered slopes, revegetation and tree plantings, and green infrastructure drainage swales to treat stormwater. NCE was also responsible for all environmental and regulatory compliance permit management, biological and paleontological monitoring, pre-construction surveys, construction support services, and post construction monitoring.