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PUC staff tell commissioners collection system needs grow: $239 million added to 2016 baseline, major flood-resilience work prioritized
Summary
Project manager Stephanie Harrison told the commission the revised collection-system capital strategy raises collection needs by about $239 million over the 2016 baseline, driven by interceptor and flood-resilience work; staff prioritized cost-effective flood projects and green infrastructure to meet SSIP levels of service through 2032.
Project manager Stephanie Harrison presented the Collection System Capital Improvement Strategy to the San Francisco Public Utilities Commission on Oct. 10, describing updated project needs for the collection system within the Sewer System Improvement Program (SSIP).
Harrison reviewed the 2016 SSIP baseline (about $3.9 billion for treatment and $2.7 billion for the collection system) and said the revised collection strategy identifies an increased need of approximately $239 million above the 2016 collection baseline. She told commissioners the largest increases are in major interceptors and tunnels (including work tied to the Municipal Transportation Agency's Judah Street project) and in flood-resilience projects informed by refined sea-level-rise modeling and hydraulic analyses.
Harrison summarized the categories of work included in the strategy: the Central Bayside System Improvement Program (CBSIP) remains at the previously presented $846 million; interceptor and tunnel work increased from a $329 million placeholder to about $469 million to address additional interdepartmental projects and condition assessments; pump station needs were re-sequenced and slightly reduced from the 2016 baseline through elimination of duplicate scope with treatment projects; and discharge structures and transport storage box scope was refined and reduced based on updated condition assessment and sea-level-rise projection.
On flood resilience and stormwater management, staff identified a set of cost-effective projects that would manage about 60% of the flood risk in the level-of-service design storm for roughly 30% of the total money needed to meet the level of service; the recommended SSIP flood-resilience set represents a substantial increase compared with the 2016 placeholder and staff recommended phasing to capture highest performance first. Harrison described green infrastructure priorities and metrics (targeting both peak-flow and annual-flow objectives), noting a citywide goal to prevent 500 million gallons of annual stormwater from entering the collection system by the end of SSIP and longer-term aspirations to manage 1 billion gallons annually.
Harrison said staff will present treatment-side needs in November and the integrated 10-year capital improvement plan in December; she emphasized that finance and interdepartmental coordination will shape final phasing and affordability decisions.
Next steps: staff will finalize treatment needs, coordinate with finance on a 10-year CIP, and return to the commission with phased implementation recommendations and opportunities for coordination with other city capital programs.
