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Committee records localized sinkhole concerns, recommends monitoring and citation to USGS mapping
Summary
Members reviewed geological mapping references for subsidence, noted localized sinkholes on private property and along town roads, and asked staff to cite Utah Geological Survey/USGS mapping and add a log and mitigation steps for sinkholes to the draft plan.
The committee reviewed the draft's subsidence and sinkhole language, confirmed the geological citation source used in the plan (an older Utah Geological Survey / USGS map on the town website), and asked staff to add references and a simple local protocol for logging and monitoring sinkholes.
Members said the draft's subsidence description came from a geological map caption on the town website (a UGS/USGS product) and suggested adding a direct link to that map and to other relevant maps that identify expansive soils and fault-related conditions. Committee members described several local, small, and relatively localized sinkholes near private properties (including one described near a residence on Shafer Lane and a hollowing in the road near a large tree) and said those occurrences merit a town-maintained log and an outreach item advising prospective builders to obtain site-specific geotechnical information as part of the permitting process.
The committee discussed characterization and probability: sinkholes and subsidence in the area are most likely to be localized, often associated with a fault or local soil conditions, and would have variable magnitude depending on location. Members asked staff to reference Dowling/USGS mapping where appropriate and to include an action to maintain a simple town log of known sinkholes or depressions and to add an educational note to the plan advising property owners to undertake due-diligence geotechnical studies when building.
On mitigation, members suggested monitoring known depressions and listing a short emergency protocol (observe and report, photograph, record location, notify town staff) if a sinkhole expands or threatens infrastructure. The committee declined to draft an elaborate emergency-response procedure at this stage but asked for a pragmatic monitoring-and-notice action.
Ending: Staff will add the UGS/USGS citation, a sinkhole log action and an education note about site-specific geotechnical review to the draft plan.
