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PUC hears Treasure Island redevelopment briefing; staff flags $140M geotechnical and shared cost decisions
Summary
The SFPUC received an informational presentation on the Treasure Island/Yerba Buena redevelopment project, including proposed infrastructure the PUC would deliver (water, wastewater, possible power), a $140 million geotechnical stabilization program, ~123 million in utility costs, and questions about who — ratepayers or the developer — will bear long‑term adaptation expenses.
The San Francisco Public Utilities Commission on April 12 heard an informational briefing on the Treasure Island/Yerba Buena Island redevelopment project that outlined the scope, risks and next steps for a development program that would add up to 8,000 housing units and large new infrastructure.
Michael Timeoff of the Office of Economic and Workforce Development and other presenters said the plan envisions roughly 8,000 residential units, 450–500 hotel rooms, up to 300,000 square feet of adaptive‑reuse retail and about 300 acres of parks and open space. The project would require replacement of existing utilities and a significant geotechnical and seismic retrofit program, which Todd Adair of BKF Engineers estimated at about $140 million, plus roughly $123 million in new water, wastewater and dry‑utility infrastructure.
Why it matters: the PUC would be asked to build or operate some of the core utilities for the island — notably a wastewater treatment plant and a recycled‑water facility — and the commission must decide how much of several large upfront and long‑term costs ratepayers should shoulder versus what developers must pay. "We will be raising those elevations 3 feet above current hundred‑year high tides," Todd Adair said, describing the project’s adaptive approach to sea‑level rise and perimeter protections.
Presenters said the geotechnical plan relies on deep dynamic compaction and preloading (surcharging) to densify sands and compress bay mud; those steps require importing just over 1 million cubic yards of fill and will lower some development pads by an estimated 3 to 4 feet during construction, then be raised to final grades. Staff described a flexible approach to sea‑level rise: new development areas would be elevated about 36 inches above current 100‑year high tides and perimeter works would be sized initially for 16 inches of sea‑level rise with the option to expand over time.
On utilities, speakers said potable water supply over the Bay Bridge has sufficient average‑day capacity and that an emergency storage tank on Yerba Buena Island (about 4 million gallons) would provide short‑term emergency reserves. A dedicated recycled water plant adjacent to the wastewater plant is planned to supply irrigation and nonpotable indoor uses, reducing potable demand projected for the development.
Commissioners pressed for detail on who pays for which elements. Timeoff and staff said some collection and distribution infrastructure is expected to be developer‑funded while the PUC would likely own and operate the wastewater treatment plant; staff committed to returning with a clearer cost split and fiscal analysis. Commissioners also asked for a more detailed jobs breakdown and the fiscal analysis and staff agreed to provide the materials in advance of the April 26 follow‑up presentation.
Public comment included a call from the PUC Citizens Advisory Committee for careful scrutiny of job and equal‑opportunity provisions and a warning that some commitments could create long‑term obligations for the SFPUC.
Next steps: staff said the EIR certification and related planning actions are scheduled before the planning commission on April 21, with PUC actions on the mitigation monitoring plan, development agreement and infrastructure plan anticipated at the commission’s April 26 meeting; final board of supervisors approvals were anticipated in early June.
