RFQ D/B - Kansas and Marin Street Wet Weather Conveyance Tunnels

As part of its Sewer System Improvements Program (SSIP), the SFPUC is proposing the Project to improve the areas sewer system performance during wet weather. The neighborhood surrounding the intersection of Kansas and Marin Streets has historically been subject to flooding during moderate to heavy storms. The City has identified and analyzed various solutions to the flooding challenges and completed an Alternatives Analysis Report (AAR) and a Conceptual Engineering Report (CER) to meet the Projects needs. This proposed Project will provide an auxiliary sewer (an 8-foot diameter tunnel, approximately 900 feet long) that provides additional conveyance capacity and serves as a connection between an existing 12.5-foot x 6.5-foot reinforced concrete box sewer under Marin Street and another 20-foot x 30-foot reinforced concrete box sewer (the Contract C Box) inside the SFPUCs property, Lot 31. The proposed auxiliary sewer would allow wet weather flows to enter the Contract C Box earlier, thereby, lowering the hydraulic grade line (HGL) of the Marin Street sewer. Based on the findings and results of the hydraulic analysis performed, the elements described below would meet the proposed project needs. ESTIMATED COST $12,500,000 to $16,000,000 Deadline for Candidates to Submit RFQ Questions* ......................................................... August 20, 2021 Deadline for Candidates to Object to RFQ Terms ............................................................... August 20, 2021 *The value for this project is based on a financial range. The value is listed as the highest possible cost from the range provided by a stakeholder or official project document.

Division 02 -	Existing Conditions, Subsurface Investigation.
Division 31 -	Earthwork, Site Clearing, Grading, Excavation and Fill, Subgrade Preparation, Excavation, Shoring, Tunneling and Mining, Tunnel Excavation.
Division 33 -	Utilities, Instrumentation and Control for Utilities, Water Utilities, Water Utility Distribution Piping, Water Utility Distribution Equipment, Disinfecting of Water Utility Distribution, Water Utility Storage Tanks.
Division 35 -	Waterway and Marine Construction, Dam Construction and Equipment.