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City staff outline geotechnical findings, three-step plan after new cracking and leaks at municipal building
Summary
City staff presented a geotechnical report showing fat clays and inadequate drainage under parts of the municipal building foundation, proposed immediate measures and a legal review, and warned repairs could be costly.
City staff told the Administration & Public Works Committee that a recent geotechnical study found fat clays and a likely missing drainage pipe under the footing behind the municipal building, a pattern the department believes is contributing to recent leaks and new cracks.
The study, summarized by staff member Thomas Lee, identified four elements: crack monitors on multiple floors, rain‑garden test pits, a piezometer monitoring groundwater, and nine slab cores. The core samples and test pits found clay in the engineered depth the 2006 geotechnical…
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