COLORADO TRENCHING AND EXCAVATION
COMPETENT PERSON CERTIFCATION EXAM
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) Q&A 2026 |INSTANT DOWNLOAD PDF
1. What is the primary responsibility of a competent person
on an excavation site?
A. Operate excavation machinery
B. Design structural engineering plans
C. Identify hazards and ensure corrective actions are taken
D. Approve worker payroll
Rationale: A competent person must have authority and
training to recognize hazards and ensure they are corrected
immediately.
Correct Answer: C
2. Which OSHA standard governs excavation and trenching
safety?
A. 29 CFR 1926 Subpart P
B. 29 CFR 1910 Subpart Z
C. 29 CFR 1926 Subpart M
D. 40 CFR Part 60
,Rationale: Excavation and trenching requirements are
specifically outlined in Subpart P.
Correct Answer: A
3. What is the minimum safe distance a spoil pile should be
placed from the edge of an excavation?
A. 1 foot
B. 2 feet
C. At least 2 feet or more
D. 6 feet
Rationale: Spoil piles must be kept at least 2 feet away to
reduce surcharge load and collapse risk.
Correct Answer: C
4. Which soil type is considered the most stable?
A. Type C
B. Type B
C. Type A
D. Sandy soil
Rationale: Type A soil is the most cohesive and stable under
OSHA classification.
Correct Answer: C
5. A trench is defined as an excavation that is:
,A. Wider than it is deep
B. Deeper than it is wide and not wider than 15 feet
C. Any excavation over 20 feet deep
D. Always less than 5 feet deep
Rationale: OSHA defines a trench as a narrow excavation
deeper than it is wide.
Correct Answer: B
6. What is the most common hazard in trenching operations?
A. Electrical shock
B. Cave-ins
C. Fire
D. Chemical exposure
Rationale: Cave-ins are the leading cause of trenching fatalities.
Correct Answer: B
7. When is protective system required in an excavation?
A. At any depth
B. When excavation is 5 feet or deeper unless in stable rock
C. Only at 10 feet or deeper
D. Only in wet soil
Rationale: OSHA requires protection at 5 feet or deeper unless
the soil is stable rock.
Correct Answer: B
, 8. Which of the following is a protective system used in
trenches?
A. Shielding (trench box)
B. Scaffolding
C. Fall arrest system
D. Fire blanket
Rationale: Trench boxes are commonly used shielding systems.
Correct Answer: A
9. A sloping protective system is used to:
A. Increase soil weight
B. Prevent worker entry
C. Prevent cave-ins by cutting back trench walls
D. Replace air monitoring
Rationale: Sloping reduces pressure on trench walls.
Correct Answer: C
10. Benching in excavation refers to:
A. Installing ladders
B. Cutting steps into trench walls
C. Filling excavation
D. Measuring soil density
COMPETENT PERSON CERTIFCATION EXAM
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) Q&A 2026 |INSTANT DOWNLOAD PDF
1. What is the primary responsibility of a competent person
on an excavation site?
A. Operate excavation machinery
B. Design structural engineering plans
C. Identify hazards and ensure corrective actions are taken
D. Approve worker payroll
Rationale: A competent person must have authority and
training to recognize hazards and ensure they are corrected
immediately.
Correct Answer: C
2. Which OSHA standard governs excavation and trenching
safety?
A. 29 CFR 1926 Subpart P
B. 29 CFR 1910 Subpart Z
C. 29 CFR 1926 Subpart M
D. 40 CFR Part 60
,Rationale: Excavation and trenching requirements are
specifically outlined in Subpart P.
Correct Answer: A
3. What is the minimum safe distance a spoil pile should be
placed from the edge of an excavation?
A. 1 foot
B. 2 feet
C. At least 2 feet or more
D. 6 feet
Rationale: Spoil piles must be kept at least 2 feet away to
reduce surcharge load and collapse risk.
Correct Answer: C
4. Which soil type is considered the most stable?
A. Type C
B. Type B
C. Type A
D. Sandy soil
Rationale: Type A soil is the most cohesive and stable under
OSHA classification.
Correct Answer: C
5. A trench is defined as an excavation that is:
,A. Wider than it is deep
B. Deeper than it is wide and not wider than 15 feet
C. Any excavation over 20 feet deep
D. Always less than 5 feet deep
Rationale: OSHA defines a trench as a narrow excavation
deeper than it is wide.
Correct Answer: B
6. What is the most common hazard in trenching operations?
A. Electrical shock
B. Cave-ins
C. Fire
D. Chemical exposure
Rationale: Cave-ins are the leading cause of trenching fatalities.
Correct Answer: B
7. When is protective system required in an excavation?
A. At any depth
B. When excavation is 5 feet or deeper unless in stable rock
C. Only at 10 feet or deeper
D. Only in wet soil
Rationale: OSHA requires protection at 5 feet or deeper unless
the soil is stable rock.
Correct Answer: B
, 8. Which of the following is a protective system used in
trenches?
A. Shielding (trench box)
B. Scaffolding
C. Fall arrest system
D. Fire blanket
Rationale: Trench boxes are commonly used shielding systems.
Correct Answer: A
9. A sloping protective system is used to:
A. Increase soil weight
B. Prevent worker entry
C. Prevent cave-ins by cutting back trench walls
D. Replace air monitoring
Rationale: Sloping reduces pressure on trench walls.
Correct Answer: C
10. Benching in excavation refers to:
A. Installing ladders
B. Cutting steps into trench walls
C. Filling excavation
D. Measuring soil density
