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
NOD - Notice of Determination
Received
Posted
5/1/2024
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 G Cook
Agency Name
Sonoma County Water Agency
Job Title
Senior Environmental Specialist
Contact Types
Lead/Public Agency
Phone
Email
Location
Coordinates
Cities
Glen Ellen
Counties
Sonoma
Regions
Northern California, Unincorporated
Cross Streets
Arnold Drive & Hill Road
Zip
95442
Total Acres
.77
Parcel #
054-190-016-000
Notice of Determination
Approving Agency
Sonoma Valley County Sanitation District
Approving Agency Role
Lead Agency
Approved On
County Clerk
Sonoma
Final Environmental Document Available at
Sonoma County Water Agency
Determinations
(1) The project will have a significant impact on the environment
No
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
No
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
Yes
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
No
(3) Mitigated measures were made a condition of the approval of the project
Yes
(4) A mitigation reporting or monitoring plan was adopted for this project
Yes
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
Yes
Attachments
Notice of Determination
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