2025-2026 Sewer Manhole Rehabilitation Project, Hayward, CA

The project includes, but is not limited to, the improvement of 21 manholes as shown in the Manhole Rehabilitation Table in Attachment C and a detail for a typical manhole is shown on SD-304 Standard Manhole in Attachment D. Manhole improvement is divided into two categories: channelize and rehabilitate. Channelizing is defined as shaping or reconstructing the bottom of the manhole so that wastewater can flow smoothly through it. Channelizing can be done by reconstructing the bottom of manhole with concrete according to Specification Section 03300 Cast-in-Place Structural Concrete in Attachment H to make the smooth transition. The Contractor shall submit their proposal for channelizing work as part of the bid package. Rehabilitating work involves adding a mortar and epoxy composite corrosion barrier system (lining) to the sanitary sewer manholes. The work shall be done according to Specification Section 02731 Manhole Lining in Attachment G and Detail A- Manhole Rehabilitation in Attachment E. Some of the access manholes are in the street, while others are in landscaped or unimproved easements across private property (owners are required to allow crews to access public facilities within easements). All work shall be done without interruption or disruption of service to the Hayward residents unless otherwise expressly approved by the City in writing. If temporary bypassing of flows in gravity sewers around Contractors work is required to prevent interruption or disruption of service, perform this work according to Section 02145 Sewer Bypassing and Dewatering in Attachment F. All work is subject to inspection by the City inspector and is to be done in accordance with the General Conditions, Special Conditions, and Specifications, and the Citys Standard Details and Specifications (available on the Citys website at https://www.hayward-ca.gov/your-government/departments/engineering-division).