Rotary Manor Culvert Replacement Project (Lake or Streambed Alteration Agreement No. EPIMSMAN-34606-R3)

3 Documents in Project


SCH Number
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
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

Alex Single
Agency Name
Job Title
Environmental Scientist
Contact Types
Responsible Agency


San Rafael
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
Approving Agency Role
Responsible Agency
Approved On
County Clerk
Final Environmental Document Available at
2825 Cordelia Road, Suite 100, Fairfield, CA 94534


(1) The project will have a significant impact on the environment
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
(3) Mitigated measures were made a condition of the approval of the project
(4) A mitigation reporting or monitoring plan was adopted for this project
(5) A Statement of Overriding Considerations was adopted for this project
(6) Findings were made pursuant to the provisions of CEQA


Notice of Determination

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