SACRAMENTO, Calif. – The U.S. Army Corps of Engineers Sacramento District awarded a $9,232,436 contract to Pacchiosi Drill U.S.A. of New York May 29 for levee fixes on both banks of the American River, near the H Street Bridge in Sacramento.
The work is necessary to close gaps in the existing seepage cutoff walls inside the levees, and will involve jet grouting: a precise construction method that injects a seepage cutoff wall around buried utilities and near the bridge's delicate foundations. The Corps built more than 20 miles of seepage cutoff walls into American River levees between 2000 and 2002, but work was set aside for later where complicated encroachments existed such as utilities, power lines or bridges.
Construction is scheduled to begin in July, with completion expected in spring of 2015. The H Street Bridge, the American River Bike Trail and other major thoroughfares will remain open; however, some sidewalk detours are expected for safety reasons and will be clearly marked as construction nears.
The work is among the last remaining projects to close gaps in American River seepage cutoff walls, all of which are scheduled to be completed in 2015. The project is part of the American River Common Features Program, a joint effort between the Corps, the state’s California Central Valley Flood Protection Board and the Sacramento Area Flood Control Agency to reduce flood risk throughout the region.
The U.S. Army Corps of Engineers Sacramento District provides planning, engineering, project management, environmental restoration and construction services to military and civilian customers in parts of eight western states, including California, Nevada, Utah, Arizona, Colorado, Idaho, Oregon and Wyoming.
Here's an illustration of the jet-grout method: http://bit.ly/1dbJzFy