RFQ for DB-140 Southeast Water Pollution Control Plant – Secondary Clarifiers Rehabilitation

The San Francisco Public Utilities Commission (SFPUC) is issuing this Request for Qualifications (RFQ) in search of Applicants with the specified qualifications to respond to the forthcoming Request for Proposals (RFP) to design and construct the DB-140 Southeast Water Pollution Control Plant – Secondary Clarifiers Rehabilitation project (Project). An “Applicant” is any entity responding to this RFQ.Built in 1952, the Southeast Water Pollution Control Plant (SEP) is the City’s largest wastewater treatment facility, handling nearly 80% of San Francisco's combined stormwater and wastewater every year. The purpose of the SEP secondary clarifiers (SEP 230) is to separate the activated sludge in the mixed liquor from the treated wastewater. Return activated sludge is returned to the aeration tanks and waste activated sludge is transferred to the solids handling facilities. The sedimentation tanks consist of sixteen reinforced concrete circular tanks which are divided into two groups of eight, designated as the North and South clarifiers by their relative position on the plant site. Equipment included in SEP 230 includes diffusers to mix the flow in the mixed liquor channels, gates and valves to control flow and sludge/scum collection equipment in the clarifiers. A condition assessment study of SEP was implemented between 2012 and 2013, which identified structural deficiencies and needs for equipment replacement. The SEP condition assessment identified that structural rehabilitation of the clarifiers is needed. The clarifiers were found to be corroded and failure of existing clarifier related components had contributed to numerous and repeated temporary repairs and extended clarifier downtime. Through the CWWSIPSE04/WW-626 Primary & Secondary Clarifier Upgrades Project, SFPUC completed concrete spall repair, secondary clarifier mechanism replacement, and clarifier concrete coating for eight of the sixteen tanks as part of a phased implementation approach. To meet Operational Reliability (State of Good Repair) level of service goals, this project addresses rehabilitation works for the remaining eight tanks.The SFPUC strongly encourages all Applicants to attend the RFQ Pre-Submittal Conference on Wednesday, October 15, 2025, at 10:00 AM. https://sfwater.zoom.us/j/86538047049?pwd=1gm26hz82jCWM3uEp1uEHFAiIboyOM.1All requests for information concerning the RFQ must be directed to [email protected] no later than the Deadline for Applicants to Submit RFQ Questions.