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Engineer recommends pausing Lighthouse/White House Road reconstruction until adaptation-plan guidance arrives
Summary
A civil engineer reported geotechnical borings showing muck layers 7–10 feet below the roadway and recommended using geogrid stabilization rather than immediate full reconstruction; staff advised waiting for the vulnerability assessment and adaptation plan before committing to large construction work.
A Findlayhorn civil engineer told the commission borings found organic 'muck' layers seven to ten feet deep under portions of White House/Lighthouse Road that are compressing and causing differential settlement. "There were stretches of muck, organic layers, below the ground approximately 7 to 10 feet below the road," he said, and consultants recommended installing a geogrid membrane under asphalt as a stabilization measure rather than full removal of the muck.
Engineers and staff recommended pausing the planned reconstruction to await the vulnerability assessment and the adaptation plan, which will inform whether grants can cover broader resilience measures and whether a phased stormwater study is needed to ensure raised roads do not create drainage problems for adjacent properties. Residents asked about claim resolution and insurance coverage for original design errors; staff said insurance and deeper legal questions would be researched after the meeting.
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