Lake Forest Woods Sewer Improvements


SCH Number
Lead Agency
Irvine Ranch Water District
Document Title
Lake Forest Woods Sewer Improvements
Document Type
MND - Mitigated Negative Declaration
Present Land Use
General Plan: Open Space, Low Density Residential Zoning: Medium Density Residential
Document Description
The Irvine Ranch Water District (IRWD) proposes to replace, relocate, and protect portions of their existing sewer facilities that are at risk of damage from erosion by the adjacent San Diego Creek and Glenwood Tributary and provide associated access improvements (proposed Project) within The Woods community in Lake Forest, California. The objective of the proposed Project is to reduce risk to infrastructure caused by scour by relocating the existing sewer facilities in the creek to areas outside the scour zone where feasible or using stream bed improvements such as new grade control structures to reduce the potential for scour and adding concrete encasement to protect new or existing sewer facilities that cannot be relocated outside the scour zone. The proposed project would also include access improvements for ongoing maintenance of the sewer facilities. In total, IRWD would install approximately 850 feet of new sewer pipeline within Upper San Diego Creek and approximately 500 feet of new sewer pipeline in the Glenwood Tributary. In addition, IRWD proposes to install ungrouted riprap check dams and bank stabilization measures at several locations within Upper San Diego Creek and the Glenwood Tributary to reduce scour and protect existing sewer infrastructure and access roads. Riprap check dams would consist of large, ungrouted, rock riprap underlain with unwoven fabric and compacted fill.

Contact Information

Andy Uk
Agency Name
Irvine Ranch Water District
Job Title
Environmental Compliance Analyst
Contact Types
Lead/Public Agency


Lake Forest
Southern California
Cross Streets
Toledo Way, Jeronimo Road
Total Acres
Parcel #
State Highways
Upper San Diego Creek, Glenwood Tributoary
El Toro
Other Location Info
The proposed Project would be located in The Woods community in the City of Lake Forest within the County of Orange. Portions of the proposed improvements are located within a reach of Upper San Diego Creek and the Glenwood Tributary. The proposed Project site is bounded by Toledo Way to the northeast and Jeronimo Road to the southwest.

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Transportation, District 12 (DOT), California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, Santa Ana Region 8 (RWQCB), Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Rights, State Water Resources Control Board, Divison of Financial Assistance
Development Types
Other (sewer pipeline replacement/relocation)
Local Actions
Project Approval
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Energy, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Schools/Universities, Septic System, Sewer Capacity, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire
Local Review Period Start
Local Review Period End


Notice of Completion [NOC] Transmittal form

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