FY 2023-2024 Gravity Sewer Improvements Project

FY 2023-2024 Gravity Sewer Improvements Project

The Project entails the construction and rehabilitation, within the existing alignment, of sanitary sewer mains and related appurtenances within the town of San Anselmo, unincorporated community of Greenbrae, and town of Fairfax, located within the County of Marin. The Project would rehabilitate approximately 15,384 linear feet (LF) of sewer pipeline ranging from 4 to 14 in. and install 264 LF of new sewer main. Approximately 642 LF of existing pipe would be replaced via open cut excavation and 14,742 LF would be replaced via pipe bursting. Work would also include the installation of 39 sanitary sewer manholes to replace existing manholes and construction of one new manhole. The Project would include rehabilitation of sanitary sewer mains in the following areas: (1) Fairfax: Replacing approximately 4,067 LF of existing vitrified clay pipe (VCP) and cast-iron pipe (CIP) with high-density polyethylene (HDPE) pipe. Removing and replacing 14 existing sanitary sewer manholes with new manholes. (2) San Anselmo: Replacing approximately 5,259 LF of existing VCP and CIP with HDPE pipe. Removing and replacing 8 existing sanitary sewer manholes with new manholes. (3) Greenbrae: Replacing approximately 6,058 LF of existing VCP and CIP with HDPE pipe. Removing and replacing 17 existing sanitary sewer manholes with new manholes. Constructing one new manhole and installing a new sewer main (approximately 264 LF) via open cut excavation through paved public right-of-way on Los Cerros Dr. The primary objective of this Project is to relieve hydraulic and structural deficiencies and reduce groundwater infiltration with aging RVSD infrastructure.

Fairfax, San Anselmo, unincorporated community of Greenbrae

Marin

Citywide, Countywide

California Air Resources Board (ARB), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Fish and Wildlife, Marin Region 7 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Toxic Substances Control (DTSC), California Department of Transportation, District 4 (DOT), California Department of Water Resources (DWR), 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 Lands Commission (SLC), Office of Historic Preservation, San Francisco Bay Conservation and Development Commission (BCDC), State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality, State Water Resources Control Board, Division of Water Rights

Other (Sewer rehabilitation)

Sewer rehabilitation

Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, 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, Wildfire