Half Moon Bay Landfill Stormwater Management Emergency Repair Project


SCH Number
Public Agency
San Mateo County Department of Public Works
Document Title
Half Moon Bay Landfill Stormwater Management Emergency Repair Project
Document Type
NOE - Notice of Exemption
Document Description
On January 4, 2023, Governor Gavin Newsom proclaimed a state of emergency throughout the State of California to support the response to historic rain and flooding. Heavy rains caused the existing downslope stormwater drainage pipe to become disconnected, allowing water to undermine the cliffside soils, resulting in subsidence of the revetment structure. Emergency work will involve removal of dislodged revetment blocks, unstable soil, and existing pipe where the foundation is not suitable. Following the removal of the damaged blocks, soil, and a portion of the pipe, the piping will be replaced, and other existing damaged piping will be repaired. All the piping will be secured within the soil. The new downslope pipe will be like-for-like to the existing pipes which have a 12-inch diameter. Following the repairs to the downslope drainage pipe, backfill will be installed along with a geotextile fabric over the repaired area to help better stabilize the area from future erosion. Lastly, the concrete revetment blocks will be reinstalled. Post-construction erosion control BMPs will be installed to conserve soil resources and protect water quality. Work will be conducted in accordance with BMPs detailed in the County of San Mateo Routine Maintenance Program Manual.

Contact Information

Mark Chow
Agency Name
County of San Mateo Department of Public Works
Job Title
Principal Civil Engineer
Contact Types
Lead/Public Agency / Project Applicant


Half Moon Bay
San Mateo
San Francisco Bay Area
Cross Streets
Poplar Street
Parcel #
State Highways
Near Highway 1
Other Location Info
San Mateo County Landfill (closed) along the California Coastal Trail south of Poplar Beach parking lot

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 facilities damaged by storm.
County Clerk
San Mateo


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