9 In a stairway on a project what is the minimum width of th

9. In a stairway on a project, what is the minimum width of the stairway? 10. What is the height of the top rail on a stairway? 11. An excavation is at an average depth of 4.5 feet. What safety items are required? 12. The excavation in the preceding question now reaches 6.5 feet, are any additional safety items are required? If so, what are they? 13. A granular cohesionless soil reaches an unconfined compressive strength of 1.75 tons per square foot. According to the OSHA classification system, what is the soil classification of this soil? 14. In preliminary bolting up, what is the minimum number of bolts that need to be installed on a piece of steel? 15. How high can steel erection go before final bolting must occur? 16. What is a controlling contractor? 17. The concrete in a footing is specified to be 5000 psi and independent testing indicates that the current strength of the concrete is 3250 psi. Can steel erection proceed? Explain your answer 18. For all employees during steel erection, at what height must fall protection commence? pounds 19. Guard rail systems must withstand without failure a force of 20. Prior to an excavation proceeding what steps should be taken concerning underground installations:

Solution

1. A minimum width of stairway is 36 inches (914mm)

2. The height of top hand rail should not be more than 37 inches

3. When excavation depth reaches to 4. 5 feet

The following are needed

Gloves, boots

4. When excavation reaches to 6.5 feet hardhats are needed to protect the head