White Sulphur Springs Road Slide Repair Project RDS26-37
Summary
SCH Number
2026061159
Public Agency
Napa County
Document Title
White Sulphur Springs Road Slide Repair Project RDS26-37
Document Type
NOE - Notice of Exemption
Received
Posted
6/25/2026
Document Description
The proposed repair for the 3260 White Sulphur Spring Rd slide includes construction
of a 192-foot-long soldier pile retaining wall where significant settlement and damage occurred. The retaining wall will stabilize the steep slope on the south side of the roadway and help prevent future slope failures. The structural steel soldier piles are embedded in 30-inch diameter holes filled with lean concrete. The cast-in-drilled hole piles are spaced at 8 feet on center. Precast Concrete lagging is placed between the
soldier piles. Relatively closely spaced soldier piles will transfer lateral soils loads to deeper and stronger materials. Filling and repaving the roadway will be required to restore the asphalt surface and pre-slide drainage patterns. The wall height is approximately 10 feet high. Additional work includes hydroseeding, lining a roadside ditch with concrete to help deter water from the base of the wall and discarding of surplus slide material. All work will be in accordance with Napa County Storm Water Program requirements utilizing Best Management Practices and erosion control measures.
Contact Information
Name
Dana Eleanor Morrison
Agency Name
County of Napa
Job Title
Supervising Planner - Conservation
Contact Types
Lead/Public Agency
Phone
Name
Roberto De La Torre Real
Agency Name
County of Napa
Job Title
Junior Engineer
Contact Types
Project Applicant / Parties Undertaking Project
Phone
Location
Coordinates
Cities
St. Helena
Counties
Napa
Regions
Northern California, Unincorporated
Cross Streets
White Sulphur Springs Road and Spring Street
Zip
94574
Total Acres
2.0
Parcel #
027-020-026-000
State Highways
None
Railways
None
Airports
None
Schools
None
Waterways
Creeks: York, Spring, Sulphur, Sulphur North Fork, Heath; Bal Slough N. Fork and Bale Slough
Township
07N
Range
06W
Section
3
Base
MDM
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Section 15301 Class 1-Existing Facilities and Section 15302 Class 2-Replacement or Reconstruction
Reasons for Exemption
Pursuant to CEQA Section 15300, the proposed project would be considered Categorically Exempt based on at least one Exemption Class. The project site is not recognized as an important wildlife corridor by any regional or state agency or jurisdiction and, is not considered critical to the ecological functioning of adjoining open space areas. However, the project site likely supports local movement patterns of terrestrial wildlife species and provides food and cover resources for common avian and amphibian species who utilize White Sulphur Springs Road. Temporary effects due to noise and increased human activity during project activities would not interfere with these local movement patterns over time or affect the ability of these species to forage or reproduce. The project site is not listed on any hazardous waste sites enumerated under Government Code Section 65962.5. As a result, there is no reasonable possibility that the project will have a significant effect on the environment.
The proposed slide repair would be considered Categorically Exempt from CEQA pursuant to Section 15301 Class 1-Existing Facilities, which includes the operation and repair of existing public or private structures or facilities involving negligible or no expansion of existing of former use. The proposed improvements would also be considered Categorically Exempt pursuant to Section 15302, Class 2- Replacement or Reconstruction, which consists of replacement or reconstruction of existing structures and facilities where the new structure will be located on the same site as the structure replaced and will have substantially the same purpose and capacity as the structure replaced. A key consideration in the appropriateness of using these Categorical Exemptions is whether the project would be located on the same site have substantially the same purpose and involves negligible or no expansion of an existing use. In terms of negligible expansion, the proposed project will generally take place within the existing facility’s footprint and does not include significant expansions beyond existing conditions. The proposed project would restore the travel lane width and legal load capacity of the existing facility to improve public safety. Therefore, it has been determined that the proposed project qualifies for a Class 1 and Class 2 Categorical Exemption and has no reasonable possibility of having a significant effect on the environment.
County Clerk
Napa
Attachments
Notice of Exemption
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