Iowa Utility Contractor Qualification
Advanced 100-Question Practice Exam
2026 | Questions & Answers with
Detailed Rationales | Complete Exam
Prep & Study Guide
1. Under Iowa’s underground-facilities notification requirements, how far in
advance should an excavator generally submit a locate request before
beginning excavation?
A. 12 hours
B. 24 hours
C. 48 hours, excluding Saturdays, Sundays, and legal holidays
D. 72 calendar hours
Answer: 48 hours, excluding Saturdays, Sundays, and legal holidays
Rationale: Iowa’s One Call requirements generally require advance notification
before excavation, with weekends and legal holidays excluded from the 48-hour
period.
, 2. A utility contractor receives a locate ticket, but one facility operator has not
provided a positive response. What is the safest course of action?
A. Begin excavation because most utilities have responded
B. Assume the facility is not present
C. Do not proceed into the affected area until the required locate information or
response is resolved
D. Excavate mechanically until the utility is discovered
Answer: Do not proceed into the affected area until the required locate
information or response is resolved
Rationale: An unresolved locate creates an unacceptable risk of striking an
underground facility. The contractor must resolve the locating issue before
proceeding.
3. Which activity is generally considered excavation for underground-facility
notification purposes?
A. Only trenching deeper than 12 inches
B. Only excavation using heavy equipment
C. Activities such as digging, trenching, grading, drilling, augering, scraping, or
similar displacement of earth
D. Only excavation on public property
Answer: Activities such as digging, trenching, grading, drilling, augering,
scraping, or similar displacement of earth
Rationale: Underground-facility laws broadly define excavation and are not
limited to deep trenches or heavy machinery.
4. A contractor discovers an unmarked fiber-optic cable while excavating
inside the project limits. What should the crew do first?
A. Pull the cable away from the trench
B. Continue because it was not marked
C. Stop work and protect the exposed facility while its ownership and required
,response are determined
D. Cut the cable if it interferes with production
Answer: Stop work and protect the exposed facility while its ownership and
required response are determined
Rationale: An unmarked facility must be treated as potentially active.
Continuing excavation could cause service interruption, injury, or property
damage.
5. Which statement best describes private underground facilities?
A. Iowa One Call automatically locates every private line
B. Private lines are always marked by municipal utilities
C. Private facilities may not be included in the standard public utility locating
process and may require separate locating arrangements
D. Private facilities do not need to be considered during excavation
Answer: Private facilities may not be included in the standard public utility
locating process and may require separate locating arrangements
Rationale: Customer-owned or privately installed facilities may fall outside the
standard locate coverage and must be independently identified when necessary.
6. A utility contractor is planning a trench that will be 9 feet deep. Which
OSHA-related concern becomes especially important?
A. Only ladder placement
B. Protective systems for employees exposed to trench collapse hazards
C. Concrete curing
D. Pavement striping
Answer: Protective systems for employees exposed to trench collapse hazards
Rationale: Employees working in trenches are exposed to cave-in hazards, and
appropriate sloping, benching, shielding, or another compliant protective
system may be required.
, 7. Which condition would generally require particularly careful consideration
before workers enter an excavation?
A. Dry soil with no nearby utilities
B. Water accumulation or evidence of increasing groundwater in the excavation
C. A trench less than 2 feet deep
D. Freshly painted equipment
Answer: Water accumulation or evidence of increasing groundwater in the
excavation
Rationale: Water can destabilize trench walls, increase cave-in risk, reduce
footing, and create additional hazards requiring control.
8. Why should excavated spoil generally be kept away from the edge of a
trench?
A. To make the jobsite look cleaner
B. To reduce fuel consumption
C. To reduce surcharge loading and the possibility of material falling or rolling
into the excavation
D. To make surveying easier
Answer: To reduce surcharge loading and the possibility of material falling or
rolling into the excavation
Rationale: Spoil placed too close to the edge adds load to trench walls and can
fall into the excavation, increasing the risk of collapse and struck-by injuries.
9. What is the primary purpose of a trench shield?
A. To prevent groundwater from entering
B. To support overhead wires
C. To protect workers from cave-in hazards by providing a protected work area
D. To increase trench depth
Answer: To protect workers from cave-in hazards by providing a protected work
area
Advanced 100-Question Practice Exam
2026 | Questions & Answers with
Detailed Rationales | Complete Exam
Prep & Study Guide
1. Under Iowa’s underground-facilities notification requirements, how far in
advance should an excavator generally submit a locate request before
beginning excavation?
A. 12 hours
B. 24 hours
C. 48 hours, excluding Saturdays, Sundays, and legal holidays
D. 72 calendar hours
Answer: 48 hours, excluding Saturdays, Sundays, and legal holidays
Rationale: Iowa’s One Call requirements generally require advance notification
before excavation, with weekends and legal holidays excluded from the 48-hour
period.
, 2. A utility contractor receives a locate ticket, but one facility operator has not
provided a positive response. What is the safest course of action?
A. Begin excavation because most utilities have responded
B. Assume the facility is not present
C. Do not proceed into the affected area until the required locate information or
response is resolved
D. Excavate mechanically until the utility is discovered
Answer: Do not proceed into the affected area until the required locate
information or response is resolved
Rationale: An unresolved locate creates an unacceptable risk of striking an
underground facility. The contractor must resolve the locating issue before
proceeding.
3. Which activity is generally considered excavation for underground-facility
notification purposes?
A. Only trenching deeper than 12 inches
B. Only excavation using heavy equipment
C. Activities such as digging, trenching, grading, drilling, augering, scraping, or
similar displacement of earth
D. Only excavation on public property
Answer: Activities such as digging, trenching, grading, drilling, augering,
scraping, or similar displacement of earth
Rationale: Underground-facility laws broadly define excavation and are not
limited to deep trenches or heavy machinery.
4. A contractor discovers an unmarked fiber-optic cable while excavating
inside the project limits. What should the crew do first?
A. Pull the cable away from the trench
B. Continue because it was not marked
C. Stop work and protect the exposed facility while its ownership and required
,response are determined
D. Cut the cable if it interferes with production
Answer: Stop work and protect the exposed facility while its ownership and
required response are determined
Rationale: An unmarked facility must be treated as potentially active.
Continuing excavation could cause service interruption, injury, or property
damage.
5. Which statement best describes private underground facilities?
A. Iowa One Call automatically locates every private line
B. Private lines are always marked by municipal utilities
C. Private facilities may not be included in the standard public utility locating
process and may require separate locating arrangements
D. Private facilities do not need to be considered during excavation
Answer: Private facilities may not be included in the standard public utility
locating process and may require separate locating arrangements
Rationale: Customer-owned or privately installed facilities may fall outside the
standard locate coverage and must be independently identified when necessary.
6. A utility contractor is planning a trench that will be 9 feet deep. Which
OSHA-related concern becomes especially important?
A. Only ladder placement
B. Protective systems for employees exposed to trench collapse hazards
C. Concrete curing
D. Pavement striping
Answer: Protective systems for employees exposed to trench collapse hazards
Rationale: Employees working in trenches are exposed to cave-in hazards, and
appropriate sloping, benching, shielding, or another compliant protective
system may be required.
, 7. Which condition would generally require particularly careful consideration
before workers enter an excavation?
A. Dry soil with no nearby utilities
B. Water accumulation or evidence of increasing groundwater in the excavation
C. A trench less than 2 feet deep
D. Freshly painted equipment
Answer: Water accumulation or evidence of increasing groundwater in the
excavation
Rationale: Water can destabilize trench walls, increase cave-in risk, reduce
footing, and create additional hazards requiring control.
8. Why should excavated spoil generally be kept away from the edge of a
trench?
A. To make the jobsite look cleaner
B. To reduce fuel consumption
C. To reduce surcharge loading and the possibility of material falling or rolling
into the excavation
D. To make surveying easier
Answer: To reduce surcharge loading and the possibility of material falling or
rolling into the excavation
Rationale: Spoil placed too close to the edge adds load to trench walls and can
fall into the excavation, increasing the risk of collapse and struck-by injuries.
9. What is the primary purpose of a trench shield?
A. To prevent groundwater from entering
B. To support overhead wires
C. To protect workers from cave-in hazards by providing a protected work area
D. To increase trench depth
Answer: To protect workers from cave-in hazards by providing a protected work
area
