Santa Anita Sediment Removal Project

Santa Anita Sediment Removal Project

The proposed project consists of draining the Santa Anita Reservoir, removing sediment and debris from the reservoir by dry excavation, transporting the sediment from the reservoir (via conveyor belt and truck), and placing it in an existing sediment placement site. The proposed project would remove ~500,000 cubic yards of sediment from the reservoir. At completion of the proposed project, no operation changes would occur at any of the areas that are out to future sediment placement activities after the project. The proposed project includes improvements to the Santa Anita Dam, which would involve modifications to the dam's inlet/outlet works, including the construction of a new riser. The modificications are necessary to comply with seismic stability requirements determined by the CA Department of Water Resources, Division of Safety of Dams (DSOD). The riser modification would be done concurrently with the sediment removal project. The dam outlet modification component consists of constructing a concrete riser on the lowest outlet gate of the dam. The new riser would allow water above 1,230 ft to freely pass through the dam, thus meeting DSOD's seismic safety requirements. Furthermore, the existing trash rack in front of this gate would be moved to the outside of the new riser and the existing gate would be removed. Additional gates would be instlled on the outside of the new riser and the existing risers to allow for operations below the restricted level of elevation 1,231 ft.

Arcadia

Los Angeles