Sacramento River East Levee
The Sacramento River East Levee (SREL) is designed to correct levee deficiencies identified by recent hydraulic and geotechnical investigations and has resulted in approximately 3.0 miles of improvements to the California Central Valley flood protection. The Levee improvements consisted of a seepage berm, cutoff walls, drained stability berms, a landside seepage berm, and existing utility relocations.
The SREL contract included the following:
- Clearing, grubbing, and stripping of the existing levee.
- Demolition of existing structures and pedestrian features.
- Levee degrade to establish a working surface for cutoff wall construction, which included portions of the levee that were highly sensitive Native American historical sites.
- Proper export of excavated soil from the degrade operations.
- Characterization and disposal of potentially hazardous waste developed from required levee excavation.
- Soil-bentonite, slag cement-cement-bentonite and soil-cement-bentonite cutoff walls ranging in depth from approximately 60-ft to 135-ft using conventional open trench methods and deep mixed method.
- Construction of stability berms and other slope modifications, including drained stability berm, raised existing toe berm, and seepage berm and associated drainage improvements.
- Utility modifications, include installation of new pipe crossings, removal and disposal of existing pipe crossings, and installation of several precast and cast-in-place concrete structures.
- Levee reconstruction including 100% import of a low permeable levee backfill.
- Resurfacing of the levee crown using aggregate surface course and/or asphalt concrete.
- United States Army Corps of Engineers
- South Sacramento East Levee of the Sacramento River
- Start Date
- February 2020
- End Date
- December 2020
- Existing Levee Retrofit
- Performed As
- Over 1 million square feet of soil-bentonite, slag cement-cement-bentonite and soil-cement-bentonite cutoff walls ranging in depth from approximately 60-ft to 135-ft using conventional open trench methods and deep mixed methods of construction.
- Over 300,000 cubic yards of imported backfill and exported degrade materials.