- Basin 2/3 collection system improvements-conveyance package
Project Title: Basin 2/3 Collection System Improvements – Conveyance Package
Project Type: Collection System
Approximate Construction Start & End Dates: January 2020 to July 2021
- El Camino Real: El Camino Real from 36th Ave to Delaware St
- Hillsdale Blvd: Hillsdale Blvd from Hacienda to El Camino Real
- El Camino Real: El Camino Real from 38th Ave to 42nd Ave
- 28th Ave: 28th Ave from Flores St to Juniper St
- Colegrove St: 36th Ave from El Camino Real to Colegrove St, and Colegrove St from 36th Ave to 39th Ave
- Flores St: Flores St from 25th Ave to 28th Ave, and 25th Ave at El Camino Real
- Delaware St: Delaware St from 25th Ave to Pacific Blvd
- 41st Ave: Pacific Blvd from 41st Ave to Delaware St.
The purpose of the Basin 2 & 3 Collection System Upgrade is to improve the ability of the overall wastewater collection system to manage heavy seasonal rainfall. These improvements will help prevent sewer overflows, as well as help the City comply with regulatory requirements. During heavy rains, the wastewater collection system capacity is overwhelmed by the amount of rainwater that enters the system through infiltration and inflow. This causes sewer overflows at locations around San Mateo, such as manholes and at the wastewater treatment plant. These overflows contaminate city streets, creeks, lagoons, beaches, and San Francisco Bay.
This package of conveyance improvements includes eight independent pipe upgrades that total approximately 16,000 feet of pipe reliefs, extensions, and upsizes. The upgrades will reinforce the system, helping to reduce sewer overflows. Project locations are shown on the maps below.
Condition assessments and site investigations at each location are nearing completion, and final design is in progress. Most of the new pipelines will be in City streets, including some in high-traffic areas. Others will be in existing utility easements on private property. Several different methods of construction, such as open-cut trenching or different trenchless technologies, will be used based on the current conditions of each site and to reduce potential impacts on the public.
Mitigation measures will be in place to minimize the effects of the project on residents, businesses, commuters, and others. Notifications will be sent ahead of construction to alert property owners and occupants when the work will be conducted.
Environmental and Permitting Documents:
Caltrans Encroachment Permit; Caltrain Third Party Access; State of California, Division of Occupational Safety and Health-Mining – Tunneling; Final Programmatic Environmental Impact Report.
Engineer Firm Name: Stantec
Constructor Name: TBD