Project Description:

The E Basin Sewer Rehabilitation Project repaired and rehabilitated existing sanitary sewer pipeline and manholes.

This project was part of the City of San Mateo’s rehabilitation of the overall wastewater collection system. Cracked sewer pipes and laterals allow outside rainwater and groundwater to flow into the sewer system. Faulty manhole covers also allow outside water into the system. Improvements are needed to ensure proper operation, repair leaks to meet regulatory requirements, and prevent high flows that can result in sewer overflows.

Prior to construction, the City conducted a condition assessment and closed-Circuit Television (CCTV) studies to identify problem areas in the collection system and to design spot repairs.

Gravity Sewer Spot Repairs and Replacement

Gravity mains offer reliable movement of sewage and surface runoff through a sewer system. However, over time the ground can shift, roots can penetrate, and traffic can impact sewers causing them to settle and crack. During this project, our contractors repaired damaged or displaced 6-, 8-, and 10-inch-diameter sanitary sewer mains with the same size pipe at 343 locations throughout E Basin.

Manhole Repair and Replacement

Manholes need to be easily accessible for sewer maintenance and related emergencies. Over time, manholes can become covered with grass or can sink below the grade level of lawns, roads, or sidewalks. During this project, our contractors repaired 212 manholes with lining, repairing channels and benches, and fully removing and replacing select manholes.