Fairfax Capacity and Creek Crossings Project (#957)

Fairfax Capacity and Creek Crossings Project (#957)

The Ross Valley Sanitary District (RVSD) Fairfax Capacity and Creek Crossings Project #957 (Project) entails the construction and rehabilitation, within the existing alignment, of sanitary sewer mains, manholes, and related appurtenances within unincorporated Marin County and the Town of Fairfax within the County of Marin. The primary goals of this project are to provide adequate capacity to convey wet weather flows preventing sewer overflows and replace aging RVSD infrastructure and reduce inflow and infiltration into the system. The Project would rehabilitate approximately 3,300 linear feet (LF) of 6-inch sanitary sewers with new polyvinyl chloride (PVC) or high-density polyethylene (HDPE) pipe via open-cut removal and replacement (988 LF), pipe bursting (2,200 LF), guided jack and bore (140 LF), and aerial crossing (96 LF). Existing private sewer laterals would be reconnected to the sanitary sewers and rehabilitated as necessary. The Project would also increase wet weather capacity by upsizing approximately 400 LF of 15-inch gravity sewer to 18-inch gravity sewer and installing approximately 2,000 LF of new 18-inch gravity main as a relief sewer throughout downtown Fairfax along Broadway and Merwin Avenue. The Project would cross Fairfax Creek at four intersections. All work crossing Fairfax Creek would involve trenchless methods such as guided jack and bore and horizontal directional drilling. Two of the Creek Crossings are above ground and would not require excavation. The Project site encompasses approximately 0.3 acres and the total area disturbed would be approximately 13,300 square ft. Construction is expected to begin in June 2026 and is anticipated to be completed in November 2026. Work hours will generally be 8 a.m. to 5 p.m.

Fairfax

Marin

Citywide, Countywide

California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Resources Recycling and Recovery, California Department of Toxic Substances Control (DTSC), California Department of Transportation, District 4 (DOT), California Department of Water Resources (DWR), California Fish and Game Commission (CDFGC), California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), California State Coastal Conservancy (SCC), California State Lands Commission (SLC), Delta Stewardship Council, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Drinking Water, District 25 (SWRCB), State Water Resources Control Board, Division of Water Quality, State Water Resources Control Board, Division of Water Rights, State Water Resources Control Board, Divison of Financial Assistance

Other (Sewer Rehabilitation)

Sewer Rehabilitation

Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Energy, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Sewer Capacity, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire