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Hall County officials discuss contingency plan for tunnel stability, construction noise
Summary
Board members heard a discussion about preparing for a potential tunnel failure and the expected noisy, vibration-heavy phase of nearby construction; staff were asked to investigate options and return with proposals.
Hall County officials discussed a contingency plan for a nearby tunnel and possible construction noise, and asked staff to investigate mitigation options and return with proposals.
The discussion, raised during an agenda item labeled as a possible action on a contingency plan, focused on risks tied to excavation near an existing tunnel and the expected duration of the noisiest work. A county official said the sheriff and other law enforcement had been consulted about public-safety concerns and logistics.
Why it matters: contractors and residents near the site could face months of loud, vibration-heavy work and potential structural risk to the tunnel if excavation is not managed. County officials said they want options before the construction reaches its most disruptive phase.
County officials described the construction sequence and proximity to the tunnel. “The building itself is gonna be 7 foot away. But to dig the basement, you gotta get as close as you can to the tunnel…you're digging 14 feet deep,” a county official said during the meeting. That speaker also said law enforcement estimated “about 3 months” for the portion of construction that would generate the most noise and vibration.
Board members and staff discussed shoring the tunnel and other protective measures. One participant said shoring “can shore it up and and hold…that would be adequate,” while others warned that shoring technique and specifics needed further technical review. No formal motion or vote on a contingency plan was recorded during the discussion.
The board asked staff to study available mitigation strategies, possible work sequencing or staging to reduce noise and vibration impacts, and whether temporary restrictions or operational changes for emergency services would be needed. “At this point, I think we need to just do some investigating on what's available and whether there's space that we can work and and then come back to us with some ideas,” a county official said.
Staff and law enforcement will review technical options and return to the board with recommendations; no formal policy or contract decision was made at the meeting.
