Streambed Alteration Agreement Concerning San Ramon Canyon Storm Drain and Landslide Stabilization Project (R5-2001-0211).


SCH Number
Public Agency
Fish & Game #5
Document Title
Streambed Alteration Agreement Concerning San Ramon Canyon Storm Drain and Landslide Stabilization Project (R5-2001-0211).
Document Type
NOE - Notice of Exemption
Document Description
The Operator proposes to alter the streambed to replace the undersized storm drainage system south of Palos Verdes Drive East and construct storm drainage and landslide stabilization improvements within the southeasterly-trending canyon located between San Ramon Drive and Calle Aventura. The proposed project will be carried out in two phases. Phase 1, which is intended to stabilize the lanslide prior to the rainy season, involves the placement of an approximately 15,000 cubic yard "plug" at the base of the landslide along with the construction of permanent drainage facilities within the "plug" and an energy dissipation structure, cut-off wall and rip rap at the outlet of the pipe. Phase II involves the placement of approximately 50,000 cubic yards of imported soil to provide additional buttress strength for the slope. The proposed slope would be a maximum gradient of 2:1 with a height of approximately 120 feet. A brow ditch and five terrace drains will also be constructed. The brow ditch, which will be located at the daylight line, will be constructed of welded wire mesh encased in concrete and will have maximum dimensions of five feet wide and two feet deep. The five terrace drains will be constructed of the same material and will be three feet wide and 18 inches deep. Phase II also includes the revegetation of the landslide. Revegetation will consist of coastal sage scrub.

Contact Information

Brad Henderson
Agency Name
Department of Fish and Game, Region 5
Contact Types
Lead/Public Agency


Rancho Palos Verdes
Los Angeles

Notice of Exemption

Exempt Status
Statutory Exemption
Type, Section or Code
Section 15269 (b) & (c)
Reasons for Exemption
The project involves emergency repairs to an active landslide that is traversed by a privately owned access road. The road provides necessary utilities, physical access, and services to the adjacent homes. The project demands immediate action to prevent or mitigate losses of life and/or property prior to the 2001-2002 winter rainy season.

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

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