Rotary Manor Culvert Replacement Project (Lake or Streambed Alteration Agreement No. EPIMSMAN-34606-R3)
3 Documents in Project
Summary
SCH Number
2022100506
Lead Agency
City of San Rafael
Document Title
Rotary Manor Culvert Replacement Project (Lake or Streambed Alteration Agreement No. EPIMSMAN-34606-R3)
Document Type
NOD - Notice of Determination
Received
Posted
8/25/2023
Document Description
The Project is limited to replacing a failing corrugated metal culvert conveying San Rafael Creek with a box culvert. This corrugated metal culvert is buried approximately eight feet below ground and is immediately downstream of an existing buried cement box culvert which will not be removed or replaced. Cofferdams will be placed upstream and downstream of the work area, and San Rafael Creek will be temporarily
dewatered for approximately 80 feet by pumping water out of the work area and diverting water from the upstream cofferdam to the downstream cofferdam. Geotextile fabric will be placed covering the stream bed downstream of the existing culvert outflow to protect the stream bed and capture construction sediment. The work area will be excavated and the existing corrugated metal culvert will be replaced with a 45-foot long, 8-foot wide, and 6-foot high cast-in-place reinforced concrete box culvert, which will be joined to the existing culvert with concrete. While the work area is excavated, one 12-inch drainpipe draining to the culvert will be replaced and one underground Pacific Gas and Electric pipeline will be temporarily relocated and replaced during backfilling. After the culvert and appurtenant structures are constructed, the area will be backfilled and compacted to 85 percent compaction, and
the geotextile fabric in the stream bed will removed. Access to the work site will be from an existing use trail on the left (east) bank of San Rafael Creek downstream of the existing culvert outflow. The Project will result in 280 square feet and 30 linear feet of temporary impacts to stream habitat in addition to the temporarily dewatered area, however no riparian vegetation will be removed except for minor tree and shrub
trimming for access. There will be no permanent impacts to habitat and no trees removed within the stream or associated riparian habitat.
Contact Information
Name
Alex Single
Agency Name
CDFW
Job Title
Environmental Scientist
Contact Types
Responsible Agency
Phone
Location
Cities
San Rafael
Counties
Marin
Regions
Northern California, San Francisco Bay Area
Other Location Info
The Project is located at San Rafael Creek, in the City of San Rafael at 1821 Fifth Ave, San Rafael, CA 94901; County of Marin, State of California; Latitude 37.975239 °N, Longitude -122.539128 °W; northeast ¼ of Section 32, Township 2 North, Range 6 West of the Mount Diablo Base Range and Meridian; U.S. Geological Survey San Rafael 7.5-minute quadrangle.
Notice of Determination
Approving Agency
CDFW
Approving Agency Role
Responsible Agency
Approved On
County Clerk
Marin
Final Environmental Document Available at
2825 Cordelia Road, Suite 100, Fairfield, CA 94534
Determinations
(1) The project will have a significant impact on the environment
No
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
No
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
Yes
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
No
(3) Mitigated measures were made a condition of the approval of the project
Yes
(4) A mitigation reporting or monitoring plan was adopted for this project
No
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
No