Build a Bench-Instability Bowtie

bowtie-map before-after verification-table Build a bowtie for fresh cracking behind a bench where a shovel is scheduled to keep digging. Hazard -> threats -> top event -> consequences -> barriers -> verification. The common shortcut is to list controls without naming the top event. That creates a control list, not a bowtie, and makes it hard to see which barrier prevents which failure path. Before Continue digging with verbal caution: "Watch the wall and call geotech if it moves." After Hold the block until exclusion, monitoring, marked dig limit, water diversion, and retreat route are verified with named owners. Hazard…

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