United States Army, Army Corps of Engineers
Santa Ana River Mainstem Project, Reach 9, Phase 3
ADM - Addendum
Present Land Use
Flood control, recreation, open space
Note: Review per lead & Addendum
The 2001 SEIS/EIR had identified six distinct locations on the south and north banks of Reach 9 that required protection. However, the Lower Santa Ana Mainstem Project Design Documentation report dated November 2011 indicated the need to improve bank protection to additional areas within Reach 9.
This SEA/EIR Addendum evaluates the environmental impacts associated with the reconstruction of an existing 1,600-foot long soil cement embankment structure located adjacent to SR 91, upstream of Gypsum Canyon Road. The reconstructed embankment would provide increased flood and scour protection to SR-91 and the Santa Ana River Interceptor pipeline which will relocated to the area between the existing levee embankment and SR 91.
California Department of Conservation (DOC), California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Parks and Recreation, California Department of Transportation, District 12 (DOT), California Highway Patrol, California Regional Water Quality Control Board, Santa Ana Region 8 (RWQCB), Caltrans, Division of Aeronautics, Department of Water Resources, Office of Emergency Services, California, Resources Agency, State Water Resources Control Board, Division of Water Quality, California Native American Heritage Commission (NAHC)
State Reviewing Agency Comments
California Native American Heritage Commission (NAHC)
Other (Flood Control)
Aesthetics, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Flood Plain/Flooding, Geology/Soils, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Noise, Population/Housing, Public Services, Recreation, Transportation, Vegetation, Wetland/Riparian
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