Marshall Petaluma Rd. MP 6.4 Retaining Wall (Notification of Lake or Streambed Alteration, No. EPIMS-MAN-32285-R3)


SCH Number
Public Agency
California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW)
Document Title
Marshall Petaluma Rd. MP 6.4 Retaining Wall (Notification of Lake or Streambed Alteration, No. EPIMS-MAN-32285-R3)
Document Type
NOE - Notice of Exemption
Document Description
The California Department of Fish and Wildlife has executed Lake and Streambed Alteration Agreement EPIMS Notification No. EPIMS-MAN-32285-R3, pursuant to Section 1602 of the Fish and Game Code to the Marin County Department of Public Works. The Project is limited to regrading a slope below Marshall Petaluma Road after damage caused by erosion, installation of a Cast-In-Drilled-Hole (CIDH) retaining wall, and associated rip-rap placement to prevent further erosion of the slope. An excavator and/or backhoe will be used to regrade the work area downslope of the retaining wall; no grading will take place in Walker Creek channel. Piers for the CIDH retaining wall will consist of two-foot diameter reinforced concrete cast in holes drilled 13 to 17 feet below ground level and extending five to eight feet above ground level. Concrete will be poured in molds constructed around the piers to create the remainder of the retaining wall. The wall will be approximately 48 feet long and installed downslope of the road. When the wall is complete, the area between the wall and road will be backfilled and compacted, and twenty-five square feet of riprap will be placed at both the upstream and downstream ends of the retaining wall. The roadway will be repaved after installation of the retaining wall. All equipment staging will occur in the road or road shoulder. No in-water work will take place. The project will result in permanent impacts to 150 square feet and 125 linear feet of predominantly ruderal vegetation dominated by grasses; and temporary impacts to 1,400 square feet and 70 linear feet of predominantly ruderal vegetation dominated by grasses. All impacts are adjacent to the riparian corridor and outside of it.

Contact Information

Alex Single
Agency Name
CA Department of Fish and Wildlife
Job Title
Environmental Scientist
Contact Types
Lead/Public Agency


Northern California
Other Location Info
The Project is located on Walker Creek, in the County of Marin, State of California; Latitude 38.16487°N, Longitude -122.78555°W; on Marshall Petaluma Road Milepost Marker 6.4; in the southeast ¼ of the northwest ¼ of Section 20, Township 4 North, Range 8 West of the Mount Diablo Base Range and Meridian; Point Reyes NE U.S. Geological Service 7.5-minute quadrangle.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Class 1 and Class 3; California Code of Regulations, title 14, section 15301 and 15303
Reasons for Exemption
The Project consists of the operation, repair, maintenance, permitting, leasing, licensing, or minor alteration of existing public or private structures, facilities, mechanical equipment, or topographical features, involving negligible or no expansion of existing or former use. The Project also consists of the construction and location of limited numbers of new, small facilities or structures; installation of small new equipment and facilities in small structures; or the conversion of existing small structures from one use to another where only minor modifications are made in the exterior of the structure.
County Clerk


Notice of Exemption

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, 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. For more information, please visit OPR’s Accessibility Site.

Download CSV New Search Print