BACK TO CATEGORIES Photo ID: 1359 (Click photo to view original size.) Category: Excavations Hazard: Employees working inside the excavation were exposed to crushing hazards in the event the back-hoe, wood cribbing and the trench box were to collapse. Standard Violated: 5(a)1 Corrective Action: Conduct a job hazard analysis, which will include calculations of the trench box capabilities, wood cribbing capabilities and soil v/s back-hoe weight load. Description: Back-hoe operating while located over the wood cribbing that was placed over the top of the trench box.