Mines Rd MM 16.18 Emergency Storm Damage Repair in Livermore, Alameda County


SCH Number
Public Agency
Alameda County Public Works Agency (ACPWA)
Document Title
Mines Rd MM 16.18 Emergency Storm Damage Repair in Livermore, Alameda County
Document Type
NOE - Notice of Exemption
Document Description
On January 23, 2023, an approximately 220-foot stretch of the south-bound lane of Mines Road at Mile Marker (MM) 16.18 was damaged by the storms forcing closure of a section of the south-bound lane at this location. Subsequent storms in 2024 have exacerbated the damage, causing further collapse of the roadway and embankment that is now encroaching into the narrow north-bound lane. The County has declared an “Emergency” on January 25th, 2024 and has proposed emergency repairs. The emergency work involves: clearing of debris deposits, excavation of a rock slope protection (RSP) embankment keyway, placement of RSP fabric on the subgrade, placement of Caltrans Class VII RSP and a layer of Class III RSP on top of the Class VII RSP, and restoration of the roadway. Anticipated permanent work will also include backfilling the RSP voids with soil and planting of willow poles or other to be determined riparian vegetation in the soil-filled RSP. Active stream flow will be temporarily diverted from the work area using eight 3x3x3-ft “supersacks” filled with rock bags placed end-to-end in the stream bed to create a diversion barrier. The supersacks will be lifted, placed, and moved as needed, using the bucket of an excavator situated on the roadway. After the work, the supersacks will be lifted out of the stream and removed. All BMP would be used afterwards.

Contact Information

James Yoo
Agency Name
Alameda County Public Works Agency
Job Title
Associate Environmental Compliance Specialist
Contact Types
Lead/Public Agency


Cross Streets
Mines Rd MM 16.18 in Livermore, Alameda County

Notice of Exemption

Exempt Status
Declared Emergency
Type, Section or Code
Sec. 15269(a)
Reasons for Exemption
Emergency project as described in State Guidelines (SEC. 15269) example (d) projects undertaken, carried out, or approved by a public agency to maintain, repair, or restore an existing highway damaged by fire, flood, storm, earthquake, land subsidence, gradual earth movement, or landslide, provided that the project is within the existing right of way of that highway and is initiated within one year of the damage occurring.
County Clerk


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