PREPIQ ILLINOIS EXCAVATION CONTRACTOR PRACTICE
EXAM|QUESTIONS AND ANSWERS WITH
RATIONALE|GRADED A+|100% CORRECT|2026 UPDATE
Which Illinois agency issues excavation contractor licenses?
A. Illinois Department of Transportation
B. Illinois Department of Labor
C. Illinois Department of Financial and Professional Regulation (IDFPR)
D. Illinois Environmental Protection Agency
Answer: C
Rationale: IDFPR regulates licensing for excavation contractors in Illinois.
Before starting excavation, the contractor must:
A. Check soil type, utility locations, and permits
B. Start digging immediately
C. Only review project drawings
D. Only check equipment
Answer: A
Rationale: Soil analysis, utility location, and proper permits prevent accidents and legal
violations.
Which OSHA regulation applies to trenching and excavation?
A. 29 CFR 1926 Subpart P
B. 29 CFR 1910 Subpart D
C. 29 CFR 1926 Subpart F
D. 29 CFR 1910 Subpart I
Answer: A
Rationale: Subpart P specifically addresses excavation safety, including trenching and protective
systems.
Maximum safe depth of a trench without protective systems is:
A. 2 feet
B. 4 feet
C. 5 feet
D. 6 feet
Answer: D
Rationale: OSHA requires protective systems for trenches 5 feet or deeper unless made entirely
in stable rock.
, Which soil type requires sloping or benching at a 1:1 ratio?
A. Stable rock
B. Type A clay
C. Type C soil (granular)
D. Sand
Answer: C
Rationale: Type C soils are unstable and require maximum slope (1:1) to prevent collapse.
What is the purpose of a trench box?
A. Store equipment
B. Protect workers from cave-ins
C. Hold water
D. Mark excavation lines
Answer: B
Rationale: Trench boxes provide structural support to protect workers in trenches.
What is the first step in excavation site preparation?
A. Obtain permits and utility clearance
B. Start digging
C. Deliver materials
D. Inspect equipment
Answer: A
Rationale: Permits and utility locates prevent damage to underground utilities and legal issues.
Which piece of equipment is commonly used for excavation in tight areas?
A. Bulldozer
B. Excavator
C. Backhoe
D. Scraper
Answer: C
Rationale: Backhoes are versatile and can operate in confined spaces efficiently.
When stockpiling excavated soil near a trench, the material must be:
A. 1 foot away
B. 2 feet away
C. At least 2 feet from the edge
D. On the edge of the trench
Answer: C
Rationale: OSHA requires soil stockpiles at least 2 feet from trench edges to prevent collapse.
, 1 Which test determines soil load-bearing capacity for foundations?
A. Proctor test
B. Atterberg limits
C. Standard penetration test (SPT)
D. Soil compaction test
Answer: C
Rationale: SPT measures soil resistance to penetration, estimating load-bearing capacity.
1 Trench sloping is not required for which soil condition?
A. Type C soil
B. Type B soil
C. Stable rock
D. Sandy soil
Answer: C
Rationale: Stable rock is self-supporting and does not require protective sloping.
1 A daily pre-shift inspection should include:
A. Equipment, trench stability, protective systems
B. Only equipment
C. Only trench measurements
D. Only permits
Answer: A
Rationale: Inspections ensure safety and compliance before workers enter the excavation site.
1 Which is a common hazard in excavation work?
A. Cave-ins
B. Falls
C. Equipment accidents
D. All of the above
Answer: D
Rationale: Excavation hazards include collapses, falls, and heavy machinery accidents.
1 Which protective system is required for trenches over 20 feet deep?
A. Sloping only
B. Trench box or shoring
C. Benching only
D. None
Answer: B
Rationale: OSHA requires engineered protective systems for deep trenches to prevent collapse.
EXAM|QUESTIONS AND ANSWERS WITH
RATIONALE|GRADED A+|100% CORRECT|2026 UPDATE
Which Illinois agency issues excavation contractor licenses?
A. Illinois Department of Transportation
B. Illinois Department of Labor
C. Illinois Department of Financial and Professional Regulation (IDFPR)
D. Illinois Environmental Protection Agency
Answer: C
Rationale: IDFPR regulates licensing for excavation contractors in Illinois.
Before starting excavation, the contractor must:
A. Check soil type, utility locations, and permits
B. Start digging immediately
C. Only review project drawings
D. Only check equipment
Answer: A
Rationale: Soil analysis, utility location, and proper permits prevent accidents and legal
violations.
Which OSHA regulation applies to trenching and excavation?
A. 29 CFR 1926 Subpart P
B. 29 CFR 1910 Subpart D
C. 29 CFR 1926 Subpart F
D. 29 CFR 1910 Subpart I
Answer: A
Rationale: Subpart P specifically addresses excavation safety, including trenching and protective
systems.
Maximum safe depth of a trench without protective systems is:
A. 2 feet
B. 4 feet
C. 5 feet
D. 6 feet
Answer: D
Rationale: OSHA requires protective systems for trenches 5 feet or deeper unless made entirely
in stable rock.
, Which soil type requires sloping or benching at a 1:1 ratio?
A. Stable rock
B. Type A clay
C. Type C soil (granular)
D. Sand
Answer: C
Rationale: Type C soils are unstable and require maximum slope (1:1) to prevent collapse.
What is the purpose of a trench box?
A. Store equipment
B. Protect workers from cave-ins
C. Hold water
D. Mark excavation lines
Answer: B
Rationale: Trench boxes provide structural support to protect workers in trenches.
What is the first step in excavation site preparation?
A. Obtain permits and utility clearance
B. Start digging
C. Deliver materials
D. Inspect equipment
Answer: A
Rationale: Permits and utility locates prevent damage to underground utilities and legal issues.
Which piece of equipment is commonly used for excavation in tight areas?
A. Bulldozer
B. Excavator
C. Backhoe
D. Scraper
Answer: C
Rationale: Backhoes are versatile and can operate in confined spaces efficiently.
When stockpiling excavated soil near a trench, the material must be:
A. 1 foot away
B. 2 feet away
C. At least 2 feet from the edge
D. On the edge of the trench
Answer: C
Rationale: OSHA requires soil stockpiles at least 2 feet from trench edges to prevent collapse.
, 1 Which test determines soil load-bearing capacity for foundations?
A. Proctor test
B. Atterberg limits
C. Standard penetration test (SPT)
D. Soil compaction test
Answer: C
Rationale: SPT measures soil resistance to penetration, estimating load-bearing capacity.
1 Trench sloping is not required for which soil condition?
A. Type C soil
B. Type B soil
C. Stable rock
D. Sandy soil
Answer: C
Rationale: Stable rock is self-supporting and does not require protective sloping.
1 A daily pre-shift inspection should include:
A. Equipment, trench stability, protective systems
B. Only equipment
C. Only trench measurements
D. Only permits
Answer: A
Rationale: Inspections ensure safety and compliance before workers enter the excavation site.
1 Which is a common hazard in excavation work?
A. Cave-ins
B. Falls
C. Equipment accidents
D. All of the above
Answer: D
Rationale: Excavation hazards include collapses, falls, and heavy machinery accidents.
1 Which protective system is required for trenches over 20 feet deep?
A. Sloping only
B. Trench box or shoring
C. Benching only
D. None
Answer: B
Rationale: OSHA requires engineered protective systems for deep trenches to prevent collapse.
