Sonoma County Water Agency Isolation Valve Seismic Hazard Mitigation Project


SCH Number
Public Agency
Sonoma County Water Agency
Document Title
Sonoma County Water Agency Isolation Valve Seismic Hazard Mitigation Project
Document Type
NOE - Notice of Exemption
Document Description
The proposed proiect involves the placement of 20 intermediate isolation valves throughout the Sonoma County Water Agency's (Water Agency) 90 miles of transmission system pipeline. The installation of each isolation valve would require excavation of a pit with approximate dimensions of 10 feet long and 10 feet wide and 8 feet deep. Placement of isolation valves are located at fault crossings, stream crossings, areas of high ground water and areas where liquefaction during strong earth shaking is likely.

Contact Information

Connie Barton
Agency Name
Sonoma County Water Agency
Contact Types
Lead/Public Agency


Cotati, Healdsburg, Healdsburg, Sebastopol, Santa Rosa, Cotati, Rohnert Park, ..., Petaluma, Rohnert Park, Santa Rosa, Sebastopol, Sonoma
Other Location Info
Kenwood and Glen Ellen

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
15301(f), 15304(f)
Reasons for Exemption
Routine seismic retrofit of facilities to meet current seismic standards and public health and safety standards without expansion of capacity or the removal of any mature scenic trees. Construction activities that include minor excavation and backfilling in previously disturbed areas along portions of the Water Agency's existing transmission system pipeline.

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

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