Sir Francis Drake MP 20.97 Slide Repair (Notification of Lake or Streambed Alteration, No. EPIMSMAN-32283-R3)
Summary
SCH Number
2024040119
Public Agency
California Department of Fish and Wildlife, Bay Delta Region 3
(CDFW)
Document Title
Sir Francis Drake MP 20.97 Slide Repair (Notification of Lake or Streambed Alteration, No. EPIMSMAN-32283-R3)
Document Type
NOE - Notice of Exemption
Received
Posted
4/3/2024
Document Description
The California Department of Fish and Wildlife has executed Lake and Streambed Alteration Agreement EPIMS Notification No. EPIMS-MAN-32283-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 two areas of slope below Sir Francis Drake Boulevard after damage caused by erosion, installation of two Cast-In-Drilled-Hole (CIDH) retaining walls, replacement of an 18-inch diameter culvert, and rip-rap placement at the lower end of the culvert. An excavator and/or backhoe will be used to regrade the work areas downslope of Sir Francis Drake Boulevard; no grading will take place in the stream bed. Piers for the CIDH retaining wall will consist of approximately two-foot diameter reinforced concrete cast in holes drilled approximately 20 feet below ground level and extending up to 10 feet above ground level. Concrete will be poured in molds constructed around the piers to create the remainder of the retaining wall. The wall at site A will be 101 feet long and five to 10 feet high on the downslope side; the wall at site B will be approximately 148 feet long and 7 to 9 feet high on the downslope side. The top of each wall will be 8 inches above the final road-side grade. Both walls will be installed downslope of the road. When the walls are complete, ground anchors will be installed behind the walls, and the area between the walls and road will be backfilled and compacted. An 18-inch diameter corrugated metal culvert running below site B will be replaced and extended approximately 10 feet further toward the stream to mitigate further erosion of the bank. Rip-rap will be placed in an area covering 20 feet by 25 feet at the end of the culvert as an energy dissipater. 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 998 square feet and 249 linear feet of permanent impact and 2,560 square feet and 290 linear feet of temporary impact to riparian habitat along the unnamed tributary to Lagunitas Creek. No trees will be removed.
Contact Information
Name
Alex Single
Agency Name
CA Department of Fish and Wildlife
Job Title
Environmental Scientist
Contact Types
Lead/Public Agency
Phone
Location
Counties
Marin
Regions
Northern California
Other Location Info
The Project is located an unnamed tributary to Lagunitas Creek, in the County of Marin, State of California; approximately 2,700 feet west-southwest of the intersection of Sir Francis Drake Boulevard and Taylor Park Road; at Latitude 38.046865 °N, Longitude -122.768978 °W; Northwest ¼ of Section 5, Township 2 North, Range 8 West of the Mount Diablo Base Range and Meridian. The project consists of two sites located at Latitude 38.04731 °N, Longitude -122.76869 °W and Latitude 38.04761 °N, Longitude -122.76674 °W.
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Class 1 and Class 3; California Code of Regulations, title 14, sections 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
Marin
Attachments
Notice of Exemption
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