January 2023 Emergency Storm Repairs, Higgins Canyon Road & Chesham Ave
Summary
SCH Number
2023030606
Public Agency
San Mateo County
Document Title
January 2023 Emergency Storm Repairs, Higgins Canyon Road & Chesham Ave
Document Type
NOE - Notice of Exemption
Received
Posted
3/23/2023
Document Description
On January 4, 2023 Governor Newsom proclaimed a state of emergency throughout California to support the ongoing response to recent winter storms. Due to the recent rains, there were three culvert locations along Higgins Canyon Road that required emergency replacement or repair. The culvert at Higgins Canyon Road Mile 1.8 had water undercutting the culvert inlet, allowing water flow beneath the culvert which had destabilized the road bank and washed out road bank soils. Repairs included a headwall floor to direct water into the culvert inlet, addition of a soil cap at the road shoulder, and addition of rock energy dissipation at the culvert outlet. The 18" CMP culvert at Higgins Canyon Road Mile 2.9 had detached and water was flowing beneath the road, outside of the culvert, which was undercutting and destabilizing the road. The culvert was replaced with an 18" HDPE culvert. The 15" CMP culvert at Higgins Canyon Road Mile 3.5 had detached and water was flowing beneath the road, outside of the culvert, which was undercutting and destabilizing the road. The culvert was replaced with a 15" HDPE culvert.
At 143 Chesham, the road shoulder has been destabilized by surface flow run-off. The road shoulder will be repaired with a rock and soil repair. Heavy equipment would be operated from the roadway. Post-construction erosion control BMPs would be installed to conserve soil resources and protect water quality. Work will be conducted using best management practices detailed in the County of San Mateo Routine Maintenance Program Manual.
Contact Information
Name
Selena Gonzalez
Agency Name
County of San Mateo
Job Title
Natural Resource Specialist
Contact Types
Lead/Public Agency / Project Applicant
Phone
Email
Location
Coordinates
Counties
San Mateo
Regions
Northern California
Cross Streets
Chesham Ave & Windsor Dr
Zip
94070
Parcel #
049141290
State Highways
Hwy 280 & Hwy 101
Waterways
Pulgas Creek
Notice of Exemption
Exempt Status
Emergency Project
Type, Section or Code
Sec. 21080(b)(4); 15269(b)(c)
Reasons for Exemption
On January 4, 2023 Governor Newsom proclaimed a state of emergency throughout California to support the ongoing response to recent winter storms. Due to the recent rains, there were three culvert locations along Higgins Canyon Road that required emergency replacement or repair to protect the road. At 143 Chesham, the road shoulder has been destabilized by surface flow run-off and the road is at risk of failure.
County Clerk
San Mateo
Attachments
Notice of Exemption
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