Arizona Excavating Contractor Actual
Exam 2026 – Verified Practice Questions
& Answers with Safety, Grading & Utility
Topics | 100% Verified | Graded A+
1. What is the maximum allowable slope for an excavation in Type C
soil if benching is not permitted?
• A) 1:1 (45 degrees)
• B) 1.5:1 (34 degrees)
• C) 1:1.5 (53 degrees)
• D) 2:1 (26.5 degrees)
Correct ,,,,answer,,,: B) 1.5:1 (34 degrees)
Explanation: OSHA mandates that Type C soil (the least stable) must
be sloped at a ratio of 1.5:1 (horizontal to vertical). Benching is not
allowed in Type C soil because it cannot maintain structural
integrity. (29 CFR 1926 Subpart P)
2. According to OSHA, what is the minimum distance a worker must
maintain from an unprotected edge?
• A) 2 feet
• B) 4 feet
• C) 6 feet
• D) 10 feet
Correct ,,,,answer,,,: C) 6 feet
Explanation: OSHA regulations require a minimum distance of 6 feet
,from an unprotected edge to prevent falls and ensure worker safety
in excavation and trenching operations.
3. At what depth must excavations be protected against cave-ins
according to OSHA?
• A) 3 feet
• B) 4 feet
• C) 5 feet
• D) 6 feet
Correct ,,,,answer,,,: C) 5 feet
*Explanation: OSHA 1926 Subpart P requires that any trench or
excavation deeper than 5 feet must be equipped with a protective
system (sloping, shoring, or shielding) to prevent cave-ins.*
4. Who is qualified to classify soil types on a construction site?
• A) Any worker
• B) Equipment operator
• C) Competent person
• D) Project manager
Correct ,,,,answer,,,: C) Competent person
Explanation: OSHA defines a competent person as someone capable
of identifying existing and predictable hazards and who has the
authority to take prompt corrective measures. This person is
responsible for soil classification and safety inspections.
5. How often must excavations be inspected by a competent person?
• A) Once per week
• B) Daily before work starts
• C) Only after rain
• D) Monthly
,Correct ,,,,answer,,,: B) Daily before work starts
Explanation: OSHA requires that a competent person must inspect
excavations daily, before each shift, and after any event that could
increase hazards (e.g., rain, blasting). This ensures safe working
conditions.
6. What is the minimum width required for a trench ladder?
• A) 10 inches
• B) 12 inches
• C) 15 inches
• D) 18 inches
Correct ,,,,answer,,,: C) 15 inches
Explanation: A ladder used in a trench must have a minimum width
of 15 inches to provide safe egress for workers, as specified by OSHA
regulations.
7. How far from the trench edge must spoil piles be kept?
• A) 1 foot
• B) 2 feet
• C) 3 feet
• D) 4 feet
Correct ,,,,answer,,,: B) 2 feet
Explanation: Spoil piles must be placed at least 2 feet from the edge
of the excavation to prevent materials from falling into the trench
and to avoid overloading the trench walls.
8. What is the maximum distance between ladder rungs?
• A) 10 inches
• B) 12 inches
• C) 14 inches
, • D) 16 inches
Correct ,,,,answer,,,: B) 12 inches
Explanation: OSHA regulations require a maximum vertical distance
of 12 inches between ladder rungs (spacing) to ensure safe climbing
and egress from trenches.
9. When must atmospheric testing be conducted in an excavation?
• A) Only in confined spaces
• B) When depth exceeds 4 feet and oxygen deficiency exists
• C) Never required
• D) Only when requested by workers
Correct ,,,,answer,,,: B) When depth exceeds 4 feet and oxygen
deficiency exists
Explanation: Atmospheric testing must be performed when an
excavation is deeper than 4 feet and there is a potential for
hazardous atmospheres, such as oxygen deficiency or toxic gases.
10. What is the maximum allowable depth for a trench without a
protective system?
• A) 2 feet
• B) 4 feet
• C) 5 feet
• D) 10 feet
Correct ,,,,answer,,,: C) 5 feet
*Explanation: OSHA mandates that protective systems must be used
for any trench that is 5 feet or deeper. For trenches less than 5 feet,
protection is required only if the competent person identifies a
potential cave-in hazard.*
11. When must protective systems be installed in trenches?
Exam 2026 – Verified Practice Questions
& Answers with Safety, Grading & Utility
Topics | 100% Verified | Graded A+
1. What is the maximum allowable slope for an excavation in Type C
soil if benching is not permitted?
• A) 1:1 (45 degrees)
• B) 1.5:1 (34 degrees)
• C) 1:1.5 (53 degrees)
• D) 2:1 (26.5 degrees)
Correct ,,,,answer,,,: B) 1.5:1 (34 degrees)
Explanation: OSHA mandates that Type C soil (the least stable) must
be sloped at a ratio of 1.5:1 (horizontal to vertical). Benching is not
allowed in Type C soil because it cannot maintain structural
integrity. (29 CFR 1926 Subpart P)
2. According to OSHA, what is the minimum distance a worker must
maintain from an unprotected edge?
• A) 2 feet
• B) 4 feet
• C) 6 feet
• D) 10 feet
Correct ,,,,answer,,,: C) 6 feet
Explanation: OSHA regulations require a minimum distance of 6 feet
,from an unprotected edge to prevent falls and ensure worker safety
in excavation and trenching operations.
3. At what depth must excavations be protected against cave-ins
according to OSHA?
• A) 3 feet
• B) 4 feet
• C) 5 feet
• D) 6 feet
Correct ,,,,answer,,,: C) 5 feet
*Explanation: OSHA 1926 Subpart P requires that any trench or
excavation deeper than 5 feet must be equipped with a protective
system (sloping, shoring, or shielding) to prevent cave-ins.*
4. Who is qualified to classify soil types on a construction site?
• A) Any worker
• B) Equipment operator
• C) Competent person
• D) Project manager
Correct ,,,,answer,,,: C) Competent person
Explanation: OSHA defines a competent person as someone capable
of identifying existing and predictable hazards and who has the
authority to take prompt corrective measures. This person is
responsible for soil classification and safety inspections.
5. How often must excavations be inspected by a competent person?
• A) Once per week
• B) Daily before work starts
• C) Only after rain
• D) Monthly
,Correct ,,,,answer,,,: B) Daily before work starts
Explanation: OSHA requires that a competent person must inspect
excavations daily, before each shift, and after any event that could
increase hazards (e.g., rain, blasting). This ensures safe working
conditions.
6. What is the minimum width required for a trench ladder?
• A) 10 inches
• B) 12 inches
• C) 15 inches
• D) 18 inches
Correct ,,,,answer,,,: C) 15 inches
Explanation: A ladder used in a trench must have a minimum width
of 15 inches to provide safe egress for workers, as specified by OSHA
regulations.
7. How far from the trench edge must spoil piles be kept?
• A) 1 foot
• B) 2 feet
• C) 3 feet
• D) 4 feet
Correct ,,,,answer,,,: B) 2 feet
Explanation: Spoil piles must be placed at least 2 feet from the edge
of the excavation to prevent materials from falling into the trench
and to avoid overloading the trench walls.
8. What is the maximum distance between ladder rungs?
• A) 10 inches
• B) 12 inches
• C) 14 inches
, • D) 16 inches
Correct ,,,,answer,,,: B) 12 inches
Explanation: OSHA regulations require a maximum vertical distance
of 12 inches between ladder rungs (spacing) to ensure safe climbing
and egress from trenches.
9. When must atmospheric testing be conducted in an excavation?
• A) Only in confined spaces
• B) When depth exceeds 4 feet and oxygen deficiency exists
• C) Never required
• D) Only when requested by workers
Correct ,,,,answer,,,: B) When depth exceeds 4 feet and oxygen
deficiency exists
Explanation: Atmospheric testing must be performed when an
excavation is deeper than 4 feet and there is a potential for
hazardous atmospheres, such as oxygen deficiency or toxic gases.
10. What is the maximum allowable depth for a trench without a
protective system?
• A) 2 feet
• B) 4 feet
• C) 5 feet
• D) 10 feet
Correct ,,,,answer,,,: C) 5 feet
*Explanation: OSHA mandates that protective systems must be used
for any trench that is 5 feet or deeper. For trenches less than 5 feet,
protection is required only if the competent person identifies a
potential cave-in hazard.*
11. When must protective systems be installed in trenches?
