A $100 million fix to the tilting Millennium Tower in San Francisco has cleared reviews and approvals and construction work is scheduled to start in November, published reports say.
The tower is built on piles driven through soft, compressible clay soils deposited by San Francisco Bay and extending into a dense sand layer over ancient marine deposits of clays, silts, and sands, engineering firm Simpson Gumpertz & Heger (SGH) says.
After two years of lengthy permitting and approval processes, construction should begin in mid-November, Engineering News-Record reports.
“The city and state had a plethora of permit requirements for us,” SGH senior principal engineer Ronald O. Hamburger was quoted as saying in SFGate.
Construction contracts are reportedly complete and the prime contractor is in the process of securing a insurance policy, but Hamburger did not reveal the contractor’s name.
The tower has settled more than 17 inches, tilting four inches across its footprint — after the structure’s weight and nearby construction projects caused soil consolidation and lateral displacement.
SGH says it:
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