FLORIDA UNDERGROUND UTILITY
CONTRACTOR EXAM PRACTICE EXAM
2026 -2027| 150 ORIGINAL QUESTIONS
& ANSWERS from ACTUAL PAST PAPERS
| DETAILED RATIONALES | COMPLETE
EXAM PREP GRADED A+
1. During installation of a gravity sanitary sewer, the pipe is required to
maintain a specified constant slope between two manholes. The invert
elevation at the upstream manhole is 102.40 ft and the downstream invert
elevation is 99.40 ft over a horizontal distance of 600 ft. What is the
required average slope?
A. 0.25%
B. 0.40%
C. 0.50%
D. 0.75%
Answer: C. 0.50%
The elevation difference is 3.00 ft. Dividing 3.00 by 600 gives 0.005, or 0.50%.
Maintaining the calculated grade is essential for proper gravity flow.
2. A contractor is installing a water main adjacent to an existing sanitary
sewer. The plans require separation between the two utilities. If the
required separation cannot be achieved because of existing conditions,
what should the contractor do first?
,A. Install the water main at the originally planned elevation without notifying
anyone
B. Reduce the pipe diameter to create additional clearance
C. Request direction from the engineer or owner before proceeding
D. Place additional soil between the utilities and continue
Answer: C. Request direction from the engineer or owner before proceeding
When field conditions prevent compliance with the approved design, the
contractor should obtain documented direction before making a design-related
change. Unapproved modifications can create construction, regulatory, and
liability problems.
3. A trench is being excavated for a large-diameter sewer. Workers must enter
the excavation, and the excavation has unstable soil. Which condition is the
most important consideration before workers enter?
A. Whether the trench bottom is visually level
B. Whether an appropriate protective system is provided
C. Whether the excavator has enough fuel
D. Whether the pipe has already arrived
Answer: B. Whether an appropriate protective system is provided
Worker entry into an unstable excavation requires appropriate protection against
cave-in hazards. Protective systems may include sloping, benching, or an
engineered support system, depending on site conditions.
4. A 24-inch water main is installed with a specified minimum cover of 36
inches. Measurements show only 24 inches of cover after installation. What
is the most appropriate action?
A. Proceed because the pipe is already installed
B. Add asphalt directly above the pipe
C. Notify the responsible project authority and correct the installation as directed
D. Reduce the water pressure permanently
,Answer: C. Notify the responsible project authority and correct the installation
as directed
Insufficient cover can expose the pipe to traffic loads, freezing where applicable,
and other damage. The installation should be brought into compliance with the
approved requirements.
5. A trench bottom becomes saturated after groundwater enters the
excavation. The bedding material begins to lose stability. What is the
primary concern?
A. Increased pipe color variation
B. Loss of proper pipe support and potential settlement
C. Reduced pipe length
D. Increased manhole diameter
Answer: B. Loss of proper pipe support and potential settlement
Unstable saturated trench conditions can compromise bedding and pipe support.
The unsuitable material or groundwater condition must be addressed before
placing the pipe.
6. During pressure testing of a newly installed water main, the pressure falls
more rapidly than expected. What should be investigated first?
A. Pipe exterior color
B. Potential leakage and trapped air
C. Manhole bench slope
D. Asphalt thickness
Answer: B. Potential leakage and trapped air
Unexpected pressure loss can indicate leakage, trapped air, temperature effects,
or testing problems. Leakage and air-related conditions are fundamental items to
investigate.
, 7. A contractor is installing flexible sewer pipe. The pipe is properly aligned,
but the specified embedment and haunching material is not placed
correctly around the pipe. What is the greatest concern?
A. The pipe may not develop the intended soil-pipe structural interaction
B. The pipe will automatically increase in diameter
C. The manhole will become watertight
D. The sewer will require less maintenance
Answer: A. The pipe may not develop the intended soil-pipe structural
interaction
Flexible pipe relies substantially on proper surrounding soil support. Inadequate
haunching and embedment can lead to excessive deformation or settlement.
8. A trench is excavated beside an existing roadway. Heavy equipment
operates close to the excavation edge. Why is this particularly significant?
A. Equipment loads can contribute to instability of the excavation
B. Equipment automatically improves soil compaction
C. Equipment eliminates groundwater
D. Equipment prevents pipe flotation
Answer: A. Equipment loads can contribute to instability of the excavation
Loads near an excavation edge can increase stresses in the soil and contribute to a
cave-in or other instability. Equipment placement should account for excavation
safety requirements.
9. A sewer pipe is specified at a grade of 0.40%. Over a horizontal run of 750
ft, what is the required invert drop?
A. 1.5 ft
B. 2.0 ft
C. 3.0 ft
D. 4.0 ft
Answer: C. 3.0 ft
CONTRACTOR EXAM PRACTICE EXAM
2026 -2027| 150 ORIGINAL QUESTIONS
& ANSWERS from ACTUAL PAST PAPERS
| DETAILED RATIONALES | COMPLETE
EXAM PREP GRADED A+
1. During installation of a gravity sanitary sewer, the pipe is required to
maintain a specified constant slope between two manholes. The invert
elevation at the upstream manhole is 102.40 ft and the downstream invert
elevation is 99.40 ft over a horizontal distance of 600 ft. What is the
required average slope?
A. 0.25%
B. 0.40%
C. 0.50%
D. 0.75%
Answer: C. 0.50%
The elevation difference is 3.00 ft. Dividing 3.00 by 600 gives 0.005, or 0.50%.
Maintaining the calculated grade is essential for proper gravity flow.
2. A contractor is installing a water main adjacent to an existing sanitary
sewer. The plans require separation between the two utilities. If the
required separation cannot be achieved because of existing conditions,
what should the contractor do first?
,A. Install the water main at the originally planned elevation without notifying
anyone
B. Reduce the pipe diameter to create additional clearance
C. Request direction from the engineer or owner before proceeding
D. Place additional soil between the utilities and continue
Answer: C. Request direction from the engineer or owner before proceeding
When field conditions prevent compliance with the approved design, the
contractor should obtain documented direction before making a design-related
change. Unapproved modifications can create construction, regulatory, and
liability problems.
3. A trench is being excavated for a large-diameter sewer. Workers must enter
the excavation, and the excavation has unstable soil. Which condition is the
most important consideration before workers enter?
A. Whether the trench bottom is visually level
B. Whether an appropriate protective system is provided
C. Whether the excavator has enough fuel
D. Whether the pipe has already arrived
Answer: B. Whether an appropriate protective system is provided
Worker entry into an unstable excavation requires appropriate protection against
cave-in hazards. Protective systems may include sloping, benching, or an
engineered support system, depending on site conditions.
4. A 24-inch water main is installed with a specified minimum cover of 36
inches. Measurements show only 24 inches of cover after installation. What
is the most appropriate action?
A. Proceed because the pipe is already installed
B. Add asphalt directly above the pipe
C. Notify the responsible project authority and correct the installation as directed
D. Reduce the water pressure permanently
,Answer: C. Notify the responsible project authority and correct the installation
as directed
Insufficient cover can expose the pipe to traffic loads, freezing where applicable,
and other damage. The installation should be brought into compliance with the
approved requirements.
5. A trench bottom becomes saturated after groundwater enters the
excavation. The bedding material begins to lose stability. What is the
primary concern?
A. Increased pipe color variation
B. Loss of proper pipe support and potential settlement
C. Reduced pipe length
D. Increased manhole diameter
Answer: B. Loss of proper pipe support and potential settlement
Unstable saturated trench conditions can compromise bedding and pipe support.
The unsuitable material or groundwater condition must be addressed before
placing the pipe.
6. During pressure testing of a newly installed water main, the pressure falls
more rapidly than expected. What should be investigated first?
A. Pipe exterior color
B. Potential leakage and trapped air
C. Manhole bench slope
D. Asphalt thickness
Answer: B. Potential leakage and trapped air
Unexpected pressure loss can indicate leakage, trapped air, temperature effects,
or testing problems. Leakage and air-related conditions are fundamental items to
investigate.
, 7. A contractor is installing flexible sewer pipe. The pipe is properly aligned,
but the specified embedment and haunching material is not placed
correctly around the pipe. What is the greatest concern?
A. The pipe may not develop the intended soil-pipe structural interaction
B. The pipe will automatically increase in diameter
C. The manhole will become watertight
D. The sewer will require less maintenance
Answer: A. The pipe may not develop the intended soil-pipe structural
interaction
Flexible pipe relies substantially on proper surrounding soil support. Inadequate
haunching and embedment can lead to excessive deformation or settlement.
8. A trench is excavated beside an existing roadway. Heavy equipment
operates close to the excavation edge. Why is this particularly significant?
A. Equipment loads can contribute to instability of the excavation
B. Equipment automatically improves soil compaction
C. Equipment eliminates groundwater
D. Equipment prevents pipe flotation
Answer: A. Equipment loads can contribute to instability of the excavation
Loads near an excavation edge can increase stresses in the soil and contribute to a
cave-in or other instability. Equipment placement should account for excavation
safety requirements.
9. A sewer pipe is specified at a grade of 0.40%. Over a horizontal run of 750
ft, what is the required invert drop?
A. 1.5 ft
B. 2.0 ft
C. 3.0 ft
D. 4.0 ft
Answer: C. 3.0 ft
