West Sacramento Flood Control Agency Early Implementation Project

West Sacramento Flood Control Agency Early Implementation Project

The California Department of Fish and Game is executing Lake or Streambed Alteration Agreement number 1600-2007-0415-R2, pursuant to Section 1602 of the Fish and Game Code to the project applicant, West Sacramento Area Flood Control Agency. To address under- and through seepage concerns at two sites along the Sacramento Bypass levee and Sacramento River in the City of West Sacramento, two treatments are being proposed. These treatments consist of seepage cutoff wall and relief well construction. Seepage cutoff wall construction is proposed at CHP Academy site and construction of seepage walls that may include relief wells is proposed at I Street Bridge site. The entire Sacramento Bypass Levee is a well-defined levee that has recently had improvements completed on portions of the levee. The improvements included an addition of soil cement slope protection along the Sacramento Bypass and construction of a seepage cutoff wall through the western portion of the levee. The proposed treatment area within the Sacramento Bypass Levee is roughly 3,000 feet in length, extending from the Sacramento Weir in a westerly direction toward the Yolo Bypass. The treatment proposed for the Sacramento Bypass levee consists of a seepage cutoff wall up to 80 feet deep through the waterside section of the crown. The treatment would overlap with the existing seepage cutoff wall and create a continuous seepage cutoff wall through the length of the Sacramento Bypass levee. Two staging areas used for storage of construction equipment and temporary storage of soil material excavated from the crown of the levee would be located within the bypass. A band of riparian vegetation is located within the bypass at the eastern end of the project.

West Sacramento

Yolo