US-101 Petaluma Embankment Washout Repair DO (EA 1V090)
Summary
SCH Number
2026041243
Public Agency
California Department of Transportation, District 4
(DOT)
Document Title
US-101 Petaluma Embankment Washout Repair DO (EA 1V090)
Document Type
NOE - Notice of Exemption
Received
Posted
4/27/2026
Document Description
Caltrans proposes repairing an embankment washout that occurred on US-101 at post mile (PM) 5.5 in the City of Petaluma, Sonoma County. The slipout was caused by this winter’s storms, which oversaturated the slope. The surface water runoff over the slope has created a few large washouts that range from 10- to 15-feet wide and 2- to 3-feet deep. The embankment has a slope of 1H:1V. The existing ditch at the toe of the slope connected to the drainage inlet was covered by the washout material. Clearing and grubbing of material and vegetation on the slope will be required. The failed embankment slope will be excavated and then reconstructed by backfilling with borrowed material and compacted to 90% relative to compaction with the most recent standard specifications. New side slope protection will be constructed using vegetated concrete block erosion control maps (VCBMs). Bonded fiber matrix, hydromulch, hydroseed, and compost will be placed on the repaired slope. The blocked drainage inlet will be uncovered and reestablished. Traffic control will be required during construction and construction area, detour, and changeable message signs will be temporarily installed prior to construction.
Contact Information
Name
Juliane Smith
Agency Name
Caltrans
Job Title
Senior Environmental Scientist (NEPA/CEQA Specialist)
Contact Types
Lead/Public Agency / Project Applicant / Parties Undertaking Project
Address
Phone
Email
Location
Cities
Petaluma
Counties
Sonoma
Regions
Northern California, San Francisco Bay Area
State Highways
101
Other Location Info
The project is located on US-101 at post mile 5.5 in the City of Petaluma, Sonoma County.
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
PRC 21084; 14 CCR 15301 Class 1
Reasons for Exemption
Class 1 Existing Facilities. The project is not anticipated to result in any environmental impacts. The project contains a number of standardized project measures which are employed on most, if not all, Caltrans projects and were not developed in response to any specific environmental impacts resulting from the project.
County Clerk
Sonoma
Attachments
Notice of Exemption
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