Virginia (VA) UUCUnderground Utility &
Excavating Practice Exam Questions And
Correct Answers |100% Verified
|Guaranteed Success | update
1. Which document provides the most reliable information for locating existing
underground utilities before excavation?
A) Topographic map
B) Utility as-built drawing
C) Soil classification report
D) Construction schedule
Answer: B
Explanation: Utility as-built drawings are the primary source for utility location as
they detail the exact location, depth, and type of installed utilities.
2. In Virginia, what is the minimum waiting period after contacting 811 before
beginning an excavation?
A) 15 minutes
B) 30 minutes
C) 2 hours
D) No waiting period required
Answer: B
Explanation: Virginia law requires a 30-minute waiting period after an 811 call to
allow utility locators to mark the site.
3. Which soil type is classified as “Type C” according to Virginia’s Subsurface
Classification System?
A) Cohesive, high plasticity clay
B) Granular, well-graded sand and gravel
, C) Low-strength, highly variable material
D) Rock with occasional fractures
Answer: C
Explanation: Type C soils have low strength and high variability, requiring the
most protective measures during excavation.
4. When clearing and grubbing a site, which of the following must be removed to
meet Virginia standards?
A) Only trees taller than 6 ft
B) All vegetation, roots, and debris to a depth of 6 in.
C) Only visible surface debris
D) Only invasive species
Answer: B
Explanation: Clearing and grubbing requires removal of all vegetation, roots,
and debris to a minimum depth of 6 inches to prevent future settlement.
5. A hand-dig zone for a utility is defined as how many inches on either side of the
marked line?
A) 12 in.
B) 24 in.
C) 36 in.
D) 48 in.
Answer: B
Explanation: The hand-dig zone extends 24 inches laterally from the utility line,
where only manual excavation is permitted.
6. Which protective system is most appropriate for a trench 7 ft deep in Type B
granular soil?
A) Sloping at 1.5:1
B) Bench-style shoring
C) Hydraulic shoring with steel plates
D) Trench box (shield)
Answer: D
, Explanation: In Type B soils, a trench box provides reliable protection for depths
greater than 4 ft, especially when sloping may be insufficient.
7. According to OSHA Subpart P, how far must a ladder be placed from the edge of
a trench to be considered safe for access?
A) 12 in.
B) 18 in.
C) 36 in.
D) 48 in.
Answer: C
Explanation: OSHA requires that ladders be placed no more than 25 feet from
workers and extend at least 36 inches above the trench edge for safe access.
8. Which Virginia statute specifically governs underground utility damage
prevention?
A) Title 46, Chapter 8
B) Title 56, Chapter 10.3
C) Title 57, Chapter 12
D) Title 58, Chapter 5
Answer: B
Explanation: Title 56, Chapter 10.3 is the Virginia Underground Utility Damage
Prevention Act, which sets the legal framework for locating utilities before
excavation.
9. How many calendar days of advance notice must be given to utility operators
before excavating, excluding weekends and holidays?
A) 24 hours
B) 36 hours
C) 48 hours
D) 72 hours
Answer: C
Explanation: Virginia 811 requires a minimum of 48 hours notice, not counting
weekends or state holidays, to allow operators to respond and provide locates.
, 10. Which of the following is the correct minimum slope for a gravity-fed sanitary
sewer pipe?
A) 0.5%
B) 1%
C) 2%
D) 4%
Answer: C
Explanation: Virginia code requires a minimum of 2% slope (1 ft drop per 50 ft)
for gravity-fed sanitary sewers to ensure proper flow.
11. When installing a ductile-iron water main, the required minimum cover over the
pipe in a residential area is:
A) 12 in.
B) 18 in.
C) 24 in.
D) 30 in.
Answer: C
Explanation: Ductile-iron water mains must have at least 24 inches of cover to
protect against surface loads and traffic.
12. The purpose of a thrust block behind a buried pipe is to:
A) Increase pipe flow velocity
B) Prevent pipe movement due to hydraulic forces
C) Provide a decorative finish
D) Reduce pipe corrosion
Answer: B
Explanation: Thrust blocks absorb axial forces generated by water pressure,
preventing pipe displacement.
13. Which testing method is preferred for confirming the integrity of a newly
installed PVC pressure pipe?
A) Visual inspection only
B) Hydrostatic pressure test at 150% of design pressure
Excavating Practice Exam Questions And
Correct Answers |100% Verified
|Guaranteed Success | update
1. Which document provides the most reliable information for locating existing
underground utilities before excavation?
A) Topographic map
B) Utility as-built drawing
C) Soil classification report
D) Construction schedule
Answer: B
Explanation: Utility as-built drawings are the primary source for utility location as
they detail the exact location, depth, and type of installed utilities.
2. In Virginia, what is the minimum waiting period after contacting 811 before
beginning an excavation?
A) 15 minutes
B) 30 minutes
C) 2 hours
D) No waiting period required
Answer: B
Explanation: Virginia law requires a 30-minute waiting period after an 811 call to
allow utility locators to mark the site.
3. Which soil type is classified as “Type C” according to Virginia’s Subsurface
Classification System?
A) Cohesive, high plasticity clay
B) Granular, well-graded sand and gravel
, C) Low-strength, highly variable material
D) Rock with occasional fractures
Answer: C
Explanation: Type C soils have low strength and high variability, requiring the
most protective measures during excavation.
4. When clearing and grubbing a site, which of the following must be removed to
meet Virginia standards?
A) Only trees taller than 6 ft
B) All vegetation, roots, and debris to a depth of 6 in.
C) Only visible surface debris
D) Only invasive species
Answer: B
Explanation: Clearing and grubbing requires removal of all vegetation, roots,
and debris to a minimum depth of 6 inches to prevent future settlement.
5. A hand-dig zone for a utility is defined as how many inches on either side of the
marked line?
A) 12 in.
B) 24 in.
C) 36 in.
D) 48 in.
Answer: B
Explanation: The hand-dig zone extends 24 inches laterally from the utility line,
where only manual excavation is permitted.
6. Which protective system is most appropriate for a trench 7 ft deep in Type B
granular soil?
A) Sloping at 1.5:1
B) Bench-style shoring
C) Hydraulic shoring with steel plates
D) Trench box (shield)
Answer: D
, Explanation: In Type B soils, a trench box provides reliable protection for depths
greater than 4 ft, especially when sloping may be insufficient.
7. According to OSHA Subpart P, how far must a ladder be placed from the edge of
a trench to be considered safe for access?
A) 12 in.
B) 18 in.
C) 36 in.
D) 48 in.
Answer: C
Explanation: OSHA requires that ladders be placed no more than 25 feet from
workers and extend at least 36 inches above the trench edge for safe access.
8. Which Virginia statute specifically governs underground utility damage
prevention?
A) Title 46, Chapter 8
B) Title 56, Chapter 10.3
C) Title 57, Chapter 12
D) Title 58, Chapter 5
Answer: B
Explanation: Title 56, Chapter 10.3 is the Virginia Underground Utility Damage
Prevention Act, which sets the legal framework for locating utilities before
excavation.
9. How many calendar days of advance notice must be given to utility operators
before excavating, excluding weekends and holidays?
A) 24 hours
B) 36 hours
C) 48 hours
D) 72 hours
Answer: C
Explanation: Virginia 811 requires a minimum of 48 hours notice, not counting
weekends or state holidays, to allow operators to respond and provide locates.
, 10. Which of the following is the correct minimum slope for a gravity-fed sanitary
sewer pipe?
A) 0.5%
B) 1%
C) 2%
D) 4%
Answer: C
Explanation: Virginia code requires a minimum of 2% slope (1 ft drop per 50 ft)
for gravity-fed sanitary sewers to ensure proper flow.
11. When installing a ductile-iron water main, the required minimum cover over the
pipe in a residential area is:
A) 12 in.
B) 18 in.
C) 24 in.
D) 30 in.
Answer: C
Explanation: Ductile-iron water mains must have at least 24 inches of cover to
protect against surface loads and traffic.
12. The purpose of a thrust block behind a buried pipe is to:
A) Increase pipe flow velocity
B) Prevent pipe movement due to hydraulic forces
C) Provide a decorative finish
D) Reduce pipe corrosion
Answer: B
Explanation: Thrust blocks absorb axial forces generated by water pressure,
preventing pipe displacement.
13. Which testing method is preferred for confirming the integrity of a newly
installed PVC pressure pipe?
A) Visual inspection only
B) Hydrostatic pressure test at 150% of design pressure
