COLORADO TRENCH RESCUE TEHNICIAN
CERTIFICATION EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2026
|INSTANT DOWNLOAD PDF
1. What is the primary hazard in trench rescue operations?
A. Fire
B. Atmospheric oxygen enrichment
C. Cave-in
D. Electrical shock
Rationale: Trench collapses are the leading cause of fatalities in
excavation incidents due to soil instability.
Correct answer: C. Cave-in
2. Which soil type is the most unstable?
A. Type A clay
B. Type B silt
C. Type C sand/gravel
D. Bedrock
Rationale: Type C soil has the lowest cohesion and highest
collapse risk.
Correct answer: C. Type C sand/gravel
,3. What is the minimum safe egress ladder requirement in
trenches deeper than 4 feet?
A. Every 50 feet
B. Every 25 feet
C. Every 10 feet
D. Only at entry point
Rationale: OSHA requires ladders within 25 feet of lateral
travel.
Correct answer: B. Every 25 feet
4. What is the purpose of a trench protective system?
A. Increase excavation speed
B. Prevent water infiltration
C. Prevent collapse of trench walls
D. Improve visibility
Rationale: Protective systems stabilize trench walls to prevent
cave-ins.
Correct answer: C. Prevent collapse of trench walls
5. Which of the following is a protective system?
A. Hard hat
B. Sloping
C. Gloves
D. Fire extinguisher
,Rationale: Sloping is an engineered method to prevent trench
collapse.
Correct answer: B. Sloping
6. What is the minimum safe distance for spoil piles from
trench edges?
A. 1 foot
B. 2 feet
C. 3 feet
D. 5 feet
Rationale: Spoil piles should be kept at least 2 feet away to
reduce surcharge load.
Correct answer: B. 2 feet
7. What is a “surcharge load”?
A. Water pressure in soil
B. Extra weight near trench edges
C. Soil moisture content
D. Air pressure underground
Rationale: Surcharge load increases collapse risk by adding
weight near edges.
Correct answer: B. Extra weight near trench edges
8. Which soil type is cohesive?
, A. Gravel
B. Sand
C. Clay
D. Loose fill
Rationale: Clay particles stick together, providing cohesion.
Correct answer: C. Clay
9. What is the first step before entering a trench rescue
scene?
A. Enter immediately
B. Size-up and hazard assessment
C. Begin digging
D. Remove victim first
Rationale: Scene safety evaluation prevents rescuer casualties.
Correct answer: B. Size-up and hazard assessment
10. What is the primary function of a trench box?
A. Increase soil stability
B. Shield rescuers from collapse
C. Pump water
D. Mark excavation area
Rationale: Trench boxes protect personnel inside the
excavation.
Correct answer: B. Shield rescuers from collapse
CERTIFICATION EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2026
|INSTANT DOWNLOAD PDF
1. What is the primary hazard in trench rescue operations?
A. Fire
B. Atmospheric oxygen enrichment
C. Cave-in
D. Electrical shock
Rationale: Trench collapses are the leading cause of fatalities in
excavation incidents due to soil instability.
Correct answer: C. Cave-in
2. Which soil type is the most unstable?
A. Type A clay
B. Type B silt
C. Type C sand/gravel
D. Bedrock
Rationale: Type C soil has the lowest cohesion and highest
collapse risk.
Correct answer: C. Type C sand/gravel
,3. What is the minimum safe egress ladder requirement in
trenches deeper than 4 feet?
A. Every 50 feet
B. Every 25 feet
C. Every 10 feet
D. Only at entry point
Rationale: OSHA requires ladders within 25 feet of lateral
travel.
Correct answer: B. Every 25 feet
4. What is the purpose of a trench protective system?
A. Increase excavation speed
B. Prevent water infiltration
C. Prevent collapse of trench walls
D. Improve visibility
Rationale: Protective systems stabilize trench walls to prevent
cave-ins.
Correct answer: C. Prevent collapse of trench walls
5. Which of the following is a protective system?
A. Hard hat
B. Sloping
C. Gloves
D. Fire extinguisher
,Rationale: Sloping is an engineered method to prevent trench
collapse.
Correct answer: B. Sloping
6. What is the minimum safe distance for spoil piles from
trench edges?
A. 1 foot
B. 2 feet
C. 3 feet
D. 5 feet
Rationale: Spoil piles should be kept at least 2 feet away to
reduce surcharge load.
Correct answer: B. 2 feet
7. What is a “surcharge load”?
A. Water pressure in soil
B. Extra weight near trench edges
C. Soil moisture content
D. Air pressure underground
Rationale: Surcharge load increases collapse risk by adding
weight near edges.
Correct answer: B. Extra weight near trench edges
8. Which soil type is cohesive?
, A. Gravel
B. Sand
C. Clay
D. Loose fill
Rationale: Clay particles stick together, providing cohesion.
Correct answer: C. Clay
9. What is the first step before entering a trench rescue
scene?
A. Enter immediately
B. Size-up and hazard assessment
C. Begin digging
D. Remove victim first
Rationale: Scene safety evaluation prevents rescuer casualties.
Correct answer: B. Size-up and hazard assessment
10. What is the primary function of a trench box?
A. Increase soil stability
B. Shield rescuers from collapse
C. Pump water
D. Mark excavation area
Rationale: Trench boxes protect personnel inside the
excavation.
Correct answer: B. Shield rescuers from collapse
