145 Canyon Road Wall Replacement (Notification of Lake or Streambed Alteration, No. EPIMSMAN-27091-R3)


SCH Number
Public Agency
California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW)
Document Title
145 Canyon Road Wall Replacement (Notification of Lake or Streambed Alteration, No. EPIMSMAN-27091-R3)
Document Type
NOE - Notice of Exemption
Document Description
The project is limited to installing a new 90-foot long and 10-foot tall soldier pile timber lagging retaining wall and placing rip-rap on the bank of San Anselmo Creek, to support Canyon Road. Sixteen 18-inch diameter holes will be drilled into the creek bank one to three feet toward the thalweg of the existing, failing retaining wall. Steel beams will be placed in the holes, then the holes will be filled with cement. Four-inch by 12-inch lumber lagging will be placed perpendicular to the steel beams to create the retaining wall. The new wall will be attached through the old wall to the slope with tiebacks; the old wall is being retained to support Canyon Road and allow access to residences during project construction. The area between the new and existing retaining walls will be filled with soil compacted to 90%, except for a 12-inch drain layer adjacent to the new wall to be composed of permeable material. Ten square feet of rip-rap will be placed at the upstream end of the new retaining wall and 18 square feet at the downstream end. Cobbles from the bed adjacent to the old retaining wall will be removed prior to demolition and stockpiled; these will be placed at the base of the new wall with up to one cubic yard of imported rip-rap.

Contact Information

Alexander Single
Agency Name
Job Title
Environmental Scientist
Contact Types
Lead/Public Agency


Northern California, San Francisco Bay Area
Other Location Info
The project is located at San Anselmo Creek, in the County of Marin, State of California; Latitude 37.976658, Longitude -122.61003; in the northeast ¼ of Section 34, Township 2 North, Range 7 West of the Mount Diablo Base Range and Meridian, U.S. Geological Survey San Rafael quadrangle; 145 Canyon Road, Fairfax, CA 94930.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
15301 and 15302.
Reasons for Exemption
The Project consists of repair and maintenance of an existing structure involving negligible or no expansion of existing or former use. In addition, the Project consists of replacement and reconstruction of the structure with the new structure located on the same site as the structure replaced and having substantially the same purpose and capacity as the structure replaced.
County Clerk


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