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Stage 2 construction set to start in June 2025 with multi-year schedule; dewatering and dust mitigation planned
Summary
TIDA infrastructure manager outlined a June 2025 start for Stage 2 street and utility work on Treasure Island, a roughly 36-acre area with an estimated cost of $135–$150 million and about a 36-month construction window; staff described dewatering, soil surcharging and dust-control measures and provided a construction hotline.
TIDA Infrastructure Manager Wei Zhang presented a comprehensive Stage 2 construction overview on April 16, saying the developer expects to start the main street-improvement work in June 2025, with the work taking approximately 36 months and an estimated total cost of about $135 million to $150 million.
Zhang said Stage 2 covers roughly 36 acres on the eastern side of the island and includes new streets (Trade Winds, Bridal Lane, Marquis Lane, Philip Lane), a neighborhood park (Eastside Commons) and interim stormwater gardens between Building 2 and Building 3. "The developer anticipates to start this Stage 2 construction in June of 2025," Zhang said.
Staff described preparatory work already underway: geotechnical improvements near historic Buildings 2 and 3, dewatering of areas that collected rainwater, and a planned haul route along Avenue H to move fill. Zhang said the contractor is dewatering an area that accumulated about 3,000,000 gallons of water and that roughly 400,000 cubic yards of soil may be moved from the stockpile to the surcharge area to consolidate soils before development.
The project team and contractors are coordinating with agencies and adjacent users. Zhang said TIDA obtained easements to accommodate sidewalks, cycle tracks and future Muni facilities in Stage 2, and that the Job Corps campus entrance has been relocated to avoid the soil-haul route. Muni route 25 was rerouted about six months ago to avoid the upcoming construction corridor, Zhang said.
Zhang and Beck outlined mitigation measures for construction impacts: dust monitors at sensitive receptors, suspension of hauling during extreme wind events, water trucks for dust suppression and a construction hotline for complaints. TIDA and the developer plan to suspend soil hauling and use watering and other controls when winds cause excessive dust.
Zhang also provided a schedule update for San Francisco Public Utilities Commission work: the SFPUC's new wastewater treatment plant construction is scheduled for completion in September 2025, with start-up testing and commissioning to follow and anticipated operation in early 2026.
TIDA said the construction hotline is (888) 469-0797 for community inquiries and construction complaints.
Ending: Board members heard a multi-year program timeline and asked staff to continue community coordination and return with specific construction phasing and mitigation details as Stage 2 advances toward a June 2025 mobilization.
