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Staff warns underground storage tanks and site cleanup could add cost and uncertainty
Summary
Staff told committees that historic underground storage tanks on the Clock Tower site were remediated and certified closed in the 1990s but their precise locations are unknown; excavation could reveal contamination requiring remediation and additional expense.
City staff told the committees that historic underground storage tanks on the Clock Tower Plaza site were closed and certified in the 1990s, but the exact locations are not documented. Staff said the project included a Phase I and part of a Phase II environmental review, but full excavation to locate tanks was not budgeted and could require stripping concrete and additional remediation if found.
"They were remediated in the nineties...we have record that they were closed out with the state," a staff member said, but added: "No one's quite sure exactly where they are." Staff recommended holding contingency funds and a project holdback to address potential remediation costs. Committee members discussed whether to pause work to locate tanks now or to remediate if encountered during construction; staff favored addressing tanks during construction and setting funds aside in case remediation is needed.
