New-Eel Russian Facility 60% Design (Geotechnical Investigation)
Summary
SCH Number
2026020367
Public Agency
Sonoma County Water Agency
Document Title
New-Eel Russian Facility 60% Design (Geotechnical Investigation)
Document Type
NOE - Notice of Exemption
Received
Posted
2/10/2026
Document Description
The Project purpose is to conduct a subsurface geotechnical exploration program to advance the New Eel-Russian Facility (NERF) to a 60% Design. This program will collect data that will help: identify depth of river sediment (soil) deposited in the Van Arsdale Reservoir to inform sediment volume estimates; identify physical characteristics of soil to inform selection of material parameters for sediment transport modeling; characterize chemical contents of soil to inform environmental considerations and suitability considerations for river channel restoration; and investigate soil and bedrock conditions to inform the foundation design and construction of the future NERF components (i.e., pump station, retaining wall, and other associated structures) between the Cape Horn Dam and the Van Arsdale Diversion Intake. The information will also be used to inform sediment volume estimates, select material parameters for sediment transport modeling, and suitability consideration for river channel restoration and/or potential engineering use of the materials.
Contact Information
Name
Grant Davis
Agency Name
Sonoma County Water Agency
Job Title
General Manager
Contact Types
Lead/Public Agency / Parties Undertaking Project
Phone
Email
Location
Cities
Ukiah
Counties
Mendocino, Sonoma
Regions
Countywide, Northern California, Unincorporated
Other Location Info
From the town of Potter Valley, to access the downstream extent of the Project, head north on Eel River Road, and bear left to the Cape Horn Dam (Lat - 39°23'11.78"N, Long -123° 7'1.23"W). To access the upstream portion of the project from the town of Potter Valley, head north on Eel River Road, bear right on Cutoff Road, bear right on Eel River Road, cross over the bridge (over the Eel River), bear right on Eel River Road to Lat 39°22'51.22", Long - 123° 5'5.67"W
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
15306, Information Collection
Reasons for Exemption
The Project is exempt because it consists of a data collection program that does not result in a serious or major disturbance to an environmental resource.
County Clerks
Mendocino, Sonoma
Attachments
Notice of Exemption
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