A trench is being excavated in an urban environment, 4.0 metres deep, 1.0 metre wide at the bottom. Due to adjacent structures, sloping is not feasible. Which of the following is the most appropriate shoring system for ensuring worker safety in Type 2 soil conditions, according to Ontario Reg. 213/91?

Question: A trench is being excavated in an urban environment, 4.0 metres deep, 1.0 metre wide at the bottom. Due to adjacent structures, sloping is not feasible. Which of the following is the most appropriate shoring system for ensuring worker safety in Type 2 soil conditions, according to Ontario Reg. 213/91?

Answer options: ✅ Steel trench boxes with hydraulic shoring.

• Open cut with a 1:1 slope from the bottom of the trench.
• Timber sheeting and shoring with mechanical jacks.
• Aluminum hydraulic shoring frames.

Correct answer: Steel trench boxes with hydraulic shoring.

Explanation: Given the depth, narrow width, and inability to slope, a robust shoring system is required. Steel trench boxes provide structural integrity and a safe working space, while hydraulic shoring can effectively brace the trench walls against collapse in Type 2 soil as per Ontario Reg. 213/91 requirements for excavations.