SM-1 Pavement, Inlet, and Culvert Repair DO (EA 0V370)
Summary
SCH Number
2026020607
Public Agency
California Department of Transportation, District 4
(DOT)
Document Title
SM-1 Pavement, Inlet, and Culvert Repair DO (EA 0V370)
Document Type
NOE - Notice of Exemption
Received
Posted
2/17/2026
Document Description
Caltrans proposes repairing pavement settlement, an inlet, and a culvert on northbound Highway 1 in San Mateo County at post mile (PM) 18.61. The project will involve repairing the pavement settlement that was caused by a disconnected culvert and a failed drainage inlet. The pavement settlement area is approximately 80 feet by 20 feet with a vertical settlement of approximately 2 to 3 inches along the curved portion of the horizontal alignment. This causes vehicles to dip while traversing the curve, creating vehicle maneuverability concerns and safety risks for motorists. In addition, tension cracks observed on the northbound pavement surface further indicate subsurface erosion and settlement. Work will involve trenching to a depth of 7 feet to remove and replace the existing inlet with a wider G2 inlet. The culvert connection from the existing culvert will be extended to the new inlet. The sub-base of the roadway will be injected with polyurethane hi-density expansion material foam to fill the voids around the culvert. The pavement will be ground and repaved with hot mix asphalt (HMA) Type A. The existing piezometer will be abandoned. Any pavement striping and delineation that is damaged will be replaced. Temporary traffic control with traffic signal, trench shoring, and railing type K will all be required during construction activities.
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
Unincorporated San Mateo County
Counties
San Mateo
Regions
Northern California, San Francisco Bay Area
State Highways
1
Other Location Info
The project is located on Highway 1 in San Mateo County at post mile (PM) 18.61.
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
San Mateo
Attachments
Notice of Exemption
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