Module 6 - Safety Management
This framework is tested and is the correct answer structure for almost any "how should this hazard be addressed" question. From most to least effective:
Elimination removes the hazard entirely. Redesigning to avoid the work at height eliminates the fall hazard.
Substitution replaces the hazard with something less dangerous, such as a water-based coating for a solvent-based one.
Engineering controls isolate people from the hazard through physical means: guardrails, machine guarding, local exhaust ventilation, wet methods for silica.
Administrative controls change how people work: rotation, scheduling noisy work when fewer workers are present, training, permits, procedures.
Personal protective equipment is last because it protects only the individual wearing it, only if worn correctly, and it fails without warning.
The exam's point is that PPE is the least effective control and is never the first answer when a higher control is feasible. A scenario offering "require respirators" against "use wet cutting methods" wants the engineering control.
A JHA, also called an activity hazard analysis, breaks a task into steps, identifies the hazards in each step, and specifies controls for each hazard. It is performed before the work starts, by the people who will do the work where possible, and it is revisited when conditions change. High-hazard activities commonly require a written, reviewed JHA before work is permitted to begin: excavation, steel erection, crane picks, confined space entry, energized electrical work, demolition.
OSHA identifies four hazard categories responsible for the large majority of construction fatalities. Know them and the core protections.
Falls are the leading cause of construction death. The construction fall protection trigger height is generally 6 feet for most construction work, with different triggers in specific applications such as steel erection and scaffolds. Protection may be guardrails, safety nets, or personal fall arrest. A personal fall arrest system requires an anchorage capable of supporting 5,000 pounds per attached worker or designed with a safety factor of at least two under the supervision of a qualified person, a full-body harness, and a connector arranged so that free fall does not exceed 6 feet nor allow contact with a lower level. Body belts are prohibited for fall arrest. Scaffolds generally require fall protection above 10 feet. Ladders, holes, and leading edges each have specific requirements.
Struck-by hazards include vehicles and equipment, falling objects, and flying debris. Controls include high-visibility apparel, internal traffic control plans, spotters, hard hats, toe boards and debris nets, and exclusion zones under overhead work and around crane swing radii.
Caught-in or between hazards include trench collapse, equipment pinch points, and unguarded machinery. Excavation is the dominant risk. Protective systems are required at 5 feet of depth unless the excavation is entirely in stable rock (a shallower cut needs one too when a competent person sees signs of possible cave-in), and any excavation deeper than 20 feet requires a system designed by a registered professional engineer. Options are sloping, benching, shoring, or shielding with a trench box. Spoil piles must be set back at least 2 feet from the edge. A competent person must inspect the excavation daily, before each shift, and after any rain or change in conditions, with authority to remove workers. Excavations 4 feet or deeper require a means of egress within 25 feet of lateral travel.
Electrocution hazards include contact with overhead and buried lines, unguarded energized parts, and damaged equipment. Controls include lockout-tagout, ground fault circuit interrupters on construction sites, assured equipment grounding programs, minimum approach distances from energized lines, and utility locating before excavation.
These are defined terms and the exam distinguishes them. A competent person is capable of identifying existing and predictable hazards and has authorization to take prompt corrective measures. The authority is the essential half. A qualified person possesses a recognized degree, certificate, or professional standing, or extensive knowledge and experience, demonstrating the ability to resolve problems related to the work. Competent persons are required for excavations, scaffolds, fall protection, and others. Qualified persons design fall arrest systems and perform engineering determinations.
A credible site safety program includes management commitment with visible enforcement, employee involvement, hazard identification and assessment through JHAs and inspections, hazard prevention and control, training including new-hire orientation and task-specific training, incident investigation, emergency response planning, substance abuse policy, and program evaluation. The CM's review of a contractor's program checks for these elements and, more importantly, for evidence that they operate.
A recognized framework for these elements groups them as: management leadership, worker participation, hazard identification and assessment, hazard prevention and control, education and training, program evaluation and improvement, and, on sites with multiple employers, coordination and communication among them. Worker participation deserves emphasis on the exam: workers and their representatives are involved in setting goals, identifying and reporting hazards, and investigating incidents, and they have a real means to raise concerns without fear of retaliation. A program that only flows information downward, from management to crews, with no channel back up, is missing this element regardless of how thorough its written procedures are.
1. In the hierarchy of controls, PPE is:
2. Wet cutting to control silica rather than requiring respirators is an example of:
3. The general construction fall protection trigger height is:
4. Excavation protective systems are generally required at a depth of:
5. An excavation 22 feet deep requires a protective system:
6. A competent person is distinguished by:
7. A personal fall arrest anchorage must support:
8. Spoil piles adjacent to an excavation must be set back at least:
9. Excavation inspections by the competent person are required:
10. Body belts for fall arrest are:
11. A safety program in which management issues procedures but workers have no real channel to raise hazard concerns without fear of retaliation is missing:
12. A crane pick, confined space entry, and demolition all commonly require, before work begins:
13. Rotating crews to limit individual exposure to a hazard rather than removing the hazard itself is an example of:
14. Assured equipment grounding programs and ground fault circuit interrupters are primarily controls for:
Write a job hazard analysis for one high-hazard activity you have actually supervised or observed. Break it into at least six steps. For each step, list the hazards and specify the control, and label each control by its level in the hierarchy. Then count how many of your controls are PPE. If more than a third are, revisit whether a higher control is feasible for those steps.