Korbel Walls Permanent Restoration
Summary
SCH Number
2021040136
Public Agency
California Department of Transportation, District 1
(DOT)
Document Title
Korbel Walls Permanent Restoration
Document Type
NOE - Notice of Exemption
Received
Posted
4/6/2021
Document Description
This Permanent Restoration project is located along State Route (SR) 299 from postmiles (PM) R8.7 to R9.2 and R11.1 to R11.4. The project proposes to stabilize two failing slopes via retaining structures. During a federally declared storm event, a portion of the roadway prism at each location experienced significant movement, resulting in the need for restoration and permanent stabilization.
The proposed work at Location 1 (PM R8.7 to R9.2) will include slope repair and stabilization via removal of existing earth retaining elements (e.g. gabion baskets, concrete wall, ground anchors, etc.) and installation of a soldier pile ground anchor (SPGA) wall. In addition, the eastbound shoulder will be widened to 10-feet along the SPGA wall, two culverts will be replaced (at PM R8.8 and PM R11.3), and existing guardrail will be upgraded to Midwest Guardrail System (MGS).
The proposed work at Location 2 (PM R11.1 to R11.4) will include slope repair and stabilization via installation of a SPGA wall and replacement of a culvert at the north end of the wall. In addition, the eastbound shoulder will be widened to 10-feet along the SPGA wall and MGS will be installed along the top of the wall (see project layouts and typical cross sections). The work proposed by this project will decrease the risk of further movement of the roadway due to failure of the slopes supporting the roadway prism.
Contact Information
Name
Zachary Larson
Agency Name
Associate Environmental Planner
Contact Types
Lead/Public Agency
Phone
Location
Coordinates
Counties
Humboldt
Regions
Northern California
Parcel #
State of California
State Highways
State Route 299
Township
6
Range
2E
Section
11
Base
Humboldt
Other Location Info
State Route 299 Post Mile R8.7/R9.2 and R11.1/R11.4
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
PRC 21084 and 14 CCR 15300.2
Reasons for Exemption
Biological, cultural, visual, air, noise, greenhouse gas, energy, and hazardous studies and reviews have been completed. Studies have indicated that no resources would be affected by this project.
Attachments
Notice of Exemption
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