Hillstone Farms Culvert Replacement Project


SCH Number
Lead Agency
Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa
Document Title
Hillstone Farms Culvert Replacement Project
Document Type
NOE - Notice of Exemption

Document Description
The purpose of the project is to replace a failed existing culvert crossing and stabilize a streambank below an existing facility structure. Project would include removal and replacement of the failed culvert when the creek is dry. The new culvert will be sized to pass the 100-year flood and set just below grade to allow for native channel bed material to embed the culvert. The inlet and outlet will each have approx 15 lf of RSP placed for stability and interplanted with willows for channel bank stability and enhanced stream functions. Just downstream, approx 60 lf of failing RSP will be replaced with a bioengineered structure of RSP and willows to stabilize the banks protecting the existing structure.

Contact Information
Gil Falcone
Regional Water Quality Control Board, Region 1 (North Coast), Sa
5550 Skylane Boulevard, Suite A
Santa Rosa, CA 95403

Phone : (707) 576-2830


38.704061°'"N 122.956215°'"W
Other Location Info

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Reasons for Exemption
The project involves annual replacement of an existing failed culvert and bank stabilization located at the site of the existing structures being restored and rehabilitated to meet current standards of public safety, with no expansion of use.


Notice of Exemption
2019018186   PDF 41 K
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