Engineers warn filter-tank geometry and age create risks; recommend careful inspection before draining units
Bollig told the commission that the concrete original filter (1955) plus a 1992 enlargement create atypical lateral loads; draining a single filter without shoring could stress intermediate walls and lead to structural failure, so dry-tank inspection and engineered shoring were recommended.
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Consultants described structural concerns tied to the original concrete filter and how past modifications changed internal load paths. Nathan Vice explained that putting the filter system into configurations where one side is drained and the other remains full could produce lateral forces the intermediate walls were not designed to carry and could risk wall movement or failure.
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