Water Transmission Pipeline Seismic Hazard Mitigation at the Santa Rosa Creek Crossing


SCH Number
Public Agency
Sonoma County Water Agency
Document Title
Water Transmission Pipeline Seismic Hazard Mitigation at the Santa Rosa Creek Crossing
Document Type
NOE - Notice of Exemption
Present Land Use
Public Right of Way

Document Description
An existing section of the Santa Rosa Creek Aqueduct crosses under Santa Rosa Creek and is at risk of failure during an earthquake due to liquefaction and lateral spread. The proposed project would help to reduce failure of this section of the Santa Rosa Aqueduct due to earthquake-induced liquefaction and lateral spread by relocating a section of pipeline (approx. 730 ft.) from the existing stream crossing to a location downstream under E Street and Sonoma Avenue. The relocated pipeline would use a trench-less technology to tunnel under the existing E Street Bridge and concrete box culvert into which the creek currently flows. The expected result is that the project would eliminate the Santa Rosa Aqueduct’s exposure to the free face of the creek and would help to reduce the risk of failure due to earthquake-induced liquefaction and lateral spread hazard at the existing pipeline stream crossing.

Contact Information
Connie Barton
Sonoma County Water Agency
Lead/Public Agency
404 Aviation Blvd.
Santa Rosa, CA 95403

Phone : (707) 547-1905

Sonoma County Water Agency
Project Applicant


Santa Rosa
Cross Streets
Sonoma Avenue and E Street

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
15302(c) Replacement or Reconstruction and 15304(f) Minor Alterations to Land
Reasons for Exemption
The project would replace an existing utility system involving negligible or no expansion of use to reduce seismic vulnerability and meet public health and safety standards in a location near the same site as the existing pipeline and will have substantially the same purpose and capacity as the pipeline replaced. The project does not involve removal of healthy, mature, scenic trees. The project includes minor trenching and backfilling where surfaces are to be restored.


Notice of Exemption
OCR SCWA Santa Rosa Creek Crossing Project NOE   PDF 1602 K

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