January 2023 Emergency Storm Repairs, Higgins Canyon Road
Summary
SCH Number
2023090004
Public Agency
San Mateo County Department of Public Works
Document Title
January 2023 Emergency Storm Repairs, Higgins Canyon Road
Document Type
NOE - Notice of Exemption
Received
Posted
9/1/2023
Document Description
On January 4, 2023 Govenor Gavin Newson proclaimed a state of emergency throughout the State of California to support the response to historic rain and flooding. Several road slip-outs occurred along Higgins Canyon Road and require immediate repair.
1) Near 2180 Higgins Canyon Road: The damaged embankment will be stabilized and reconstructed with an inboard steel soldier pile wall with concrete lagging and outboard stacked block retaining wall. Appropriate drainage to reduce hydrostatic pressure buildup behind the wall will be incorporated into the repair. A guardrail will be installed along the length of the repair. The inboard ditch relief channel will be reconstructed to direct flow to the next cross culvert on the road.
2) Near 2665 Higgins Canyon Road: Three consecutive slip-outs may be reconstructed with a steel soldier pile and lagging retaining wall with tiebacks for the entire length of the wall. Clearing and grubbing in adjacent areas may occur as necessary. A perforated drainage pipe may be incorporated into the repair. A guardrail will be installed along the outboard side of the road.
3) Near 1780 Higgins Canyon Road: Heavy rains and elevated creek flows resulted in the accumulation of excess woody debris at the base of the road slip-out near 1780 Higgins Canyon Road, and under the Mill’s Creek Bridge. Debris management and winterization efforts need to be conducted in order to prevent further scour at the existing slip-out and bridge to maintain structural integrity of the road.
Post-construction erosion control BMPs will be installed to conserve soil resources and protect water quality at each location. All temporary surface disturbances will be seeded with native plants. Work will be conducted in accordance with BMPs detailed in the County of San Mateo Routine Maintenance Program Manual.
Contact Information
Name
Alan Velasquez
Agency Name
San Mateo County Department of Public Works
Job Title
Senior Civil Engineer
Contact Types
Lead/Public Agency / Project Applicant
Phone
Email
Location
Counties
San Mateo
Regions
San Francisco Bay Area, Unincorporated
Cross Streets
Higgins Canyon Road Mile 1.5, 2.0, and 2.9 from Highway 1
Zip
94019
State Highways
Near Highway 1
Waterways
Near Arroyo Leon Creek and Mills Creek
Township
6S
Range
5W
Section
03
Other Location Info
1) Near 2180 Higgins Canyon Road: 37°26'25.1"N 122°23'57.8"W
2) Near 2665 Higgins Canyon Road: 37°26'17.6"N 122°23'13.4"W
3) Near 1780 Higgins Canyon Road: 37°26'45.86"N 122°24'16.71"W
Notice of Exemption
Exempt Status
Emergency Project
Type, Section or Code
Sec. 21080(b)(4); 15269(b)(c)
Reasons for Exemption
Project undertaken by a public agency to repair existing road facilities damaged by storm.
County Clerk
San Mateo
Attachments
Notice of Exemption
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