Sonoma Valley County Sanitation District System Protection Plan at Kohler & Sonoma Creek Crossing Project

3 Documents in Project

Summary

SCH Number
2023070286
Lead Agency
Sonoma County Water Agency
Document Title
Sonoma Valley County Sanitation District System Protection Plan at Kohler & Sonoma Creek Crossing Project
Document Type
MND - Mitigated Negative Declaration
Received
Present Land Use
UR 2/R1 B6 2 DU, F2 LG/GE1 RC50/25 SR X/
Document Description
The Sonoma Valley County Sanitation District System Protection Plan at Kohler & Sonoma Creek Crossings Project would implement permanent repairs along Kohler and Sonoma creeks and establish new and expanded easements to provide access along the pipeline routes for repair and maintenance purposes. Streambank erosion and downcutting at the site has exposed pipeline segments, and streambank erosion is migrating towards existing maintenance holes in both Kohler and Sonoma creeks. The District implemented emergency repairs at the project site in 2019 to prevent further bank erosion that could expose the sewer pipeline and cause sewage spills. These emergency repairs were considered a temporary means to slow the progression of streambank erosion until a permanent repair could be completed. The Proposed Project would implement the permanent repair. The Sonoma Valley County Sanitation District System Protection Plan at Kohler & Sonoma Creek Crossings Project would stabilize streambanks and channel beds along Kohler and Sonoma creeks using a combination of rock slope protection, fabric reinforced fill material (FREF), log/rootwad revetments, brush mattress, and native vegetation. In addition, the existing siphon across Sonoma Creek would be armored with large boulders to protect against scour. Site improvements would also include revegetation with native plants and installation of habitat improvement elements for California freshwater shrimp, steelhead, Chinook salmon, and other aquatic species in Sonoma Creek. Implementation would require new temporary and permanent sewer pipeline easements.

Contact Information

Name
David Cook
Agency Name
Sonoma County Water Agency
Job Title
Senior Environmental Specialist
Contact Types
Lead/Public Agency

Location

Cities
Glen Ellen
Counties
Sonoma
Regions
Unincorporated
Cross Streets
Arnold Drive and Hill Road
Zip
95442
Total Acres
0.3
Parcel #
054-190-016/054-190-018
State Highways
12
Schools
Dunbar Elementary School
Waterways
Sonoma and Kohler Creeks
Township
06N
Range
06W
Section
16

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, Bay Delta Region 3 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Resources Recycling and Recovery, California Department of Transportation, District 4 (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, San Francisco Bay Region 2 (RWQCB), Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Divison of Financial Assistance
Development Types
Other (Stream bank stabilization)
Local Actions
Site Plan
Project Issues
Aesthetics, Air Quality, Biological Resources, Cultural Resources, Drainage/Absorption, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Mandatory Findings of Significance, Noise, Public Services, Recreation, Septic System, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian
Public Review Period Start
Public Review Period End

Attachments

Notice of Completion [NOC] Transmittal form

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