Project Description
Similar to the mulitple erosion sites addressed in Contract 2, the team placed a large section of riprap to armor the existing levee slope at the Contract 4 site, using approximately 45,000 tons of quarry stone material across 1,700 lineal feet of the Sacramento River levee.
Major Challenges
Delivering and installing 45,000 tons of riprap via barge from San Rafael to Sacramento within an extremely tight schedule constrained to two narrow “work windows” to protect sensitive fish species was a major challenge for this project. Another challenge was instlaling an experimental erosion solution, coir block system, a new approach used by the USACE for erosion control.
Project Highlights
Successfully implementing the USACE’s new Coir Block System, an experimental tactic used for erosion control. The coir block structure is designed to provide mechanical support to the soil, effectively reducing surface erosion while facilitating plant growth within the planting benches. Substantial colaboration between Dutra, the USACE, and local entities including the Central Valley Flood Board, the Sacramento Area Flood Control Agency (SAFCA) and the homeonwers who live behind the levees provided a positive experience between all groups that ultimately resulted in a successful, completed project.
Project Scope
Delivery and installation of 45,000 tons of riprap as well as construction of planting benches with the installation of Coir Blocks along 1,700 lineal feet of the Sacramento River levee.
