AR EH Excavation & Hauling Contractor Exam
Questions and Correct Answers (Verified Answers)
Plus Rationale 2027 Q&A| Instant Download Pdf
1. What is the primary purpose of a site excavation plan before
earthwork begins?
A. To eliminate the need for surveying
B. To determine the contractor's tax liability
C. To establish excavation limits, grades, utilities, access, and
safety requirements
D. To determine the final landscaping design
Answer: C. To establish excavation limits, grades, utilities, access, and
safety requirements
Rationale: An excavation plan provides a controlled basis for
performing earthwork. It identifies limits of excavation, required
elevations, existing utilities, access routes, drainage considerations,
and safety measures. Proper planning reduces the risk of over-
excavation, utility strikes, unstable slopes, and costly rework.
, 2. Which soil characteristic most directly affects the stability of an
excavation wall?
A. Soil color
B. Soil classification and cohesion
C. Soil temperature
D. Soil odor
Answer: B. Soil classification and cohesion
Rationale: Soil classification, cohesion, internal friction, moisture
content, and other properties influence how well an excavation wall
can stand without collapsing. Cohesive soils may behave differently
from granular soils, and changing moisture conditions can
significantly reduce stability.
3. What should be done before excavating near known underground
utilities?
A. Begin digging with a backhoe at full depth
B. Remove all warning signs from the work area
C. Verify utility locations and mark them in the field
D. Assume utility drawings are completely accurate
Answer: C. Verify utility locations and mark them in the field
Rationale: Underground utilities must be identified and located before
excavation. Plans and records may not precisely represent field
,conditions, so utility locating and appropriate field verification are
essential. Excavation near utilities may also require careful hand
digging or other approved methods.
4. What is the primary purpose of a trench protective system?
A. To increase excavation production
B. To prevent cave-ins and protect workers
C. To reduce fuel consumption
D. To improve soil color
Answer: B. To prevent cave-ins and protect workers
Rationale: Protective systems such as sloping, benching, and trench
shields are intended to protect workers from soil collapse. Cave-ins
can occur suddenly and can result in serious injury or death, making
appropriate protection a critical excavation safety measure.
5. Which condition can significantly increase the likelihood of
excavation wall failure?
A. Dry, stable soil with no nearby loads
B. Water accumulation in the excavation
C. Properly controlled access
D. Clearly marked excavation boundaries
Answer: B. Water accumulation in the excavation
, Rationale: Water can weaken soil, increase its weight, reduce
cohesion, and contribute to erosion or instability. Excavations should
therefore be inspected and managed for groundwater, surface runoff,
rainfall, and other sources of water.
6. What is over-excavation?
A. Excavating less material than specified
B. Excavating beyond the specified depth or limits
C. Hauling material to an approved disposal site
D. Compacting fill to the specified density
Answer: B. Excavating beyond the specified depth or limits
Rationale: Over-excavation occurs when material is removed beyond
the design lines or grades. It can increase project costs and may
require approved backfill, structural fill, or other corrective work to
restore the required grade.
7. Why is proper excavation slope important?
A. It improves equipment paint adhesion
B. It reduces the possibility of soil collapse
C. It eliminates the need for inspections
D. It guarantees that no groundwater will be encountered
Answer: B. It reduces the possibility of soil collapse
Questions and Correct Answers (Verified Answers)
Plus Rationale 2027 Q&A| Instant Download Pdf
1. What is the primary purpose of a site excavation plan before
earthwork begins?
A. To eliminate the need for surveying
B. To determine the contractor's tax liability
C. To establish excavation limits, grades, utilities, access, and
safety requirements
D. To determine the final landscaping design
Answer: C. To establish excavation limits, grades, utilities, access, and
safety requirements
Rationale: An excavation plan provides a controlled basis for
performing earthwork. It identifies limits of excavation, required
elevations, existing utilities, access routes, drainage considerations,
and safety measures. Proper planning reduces the risk of over-
excavation, utility strikes, unstable slopes, and costly rework.
, 2. Which soil characteristic most directly affects the stability of an
excavation wall?
A. Soil color
B. Soil classification and cohesion
C. Soil temperature
D. Soil odor
Answer: B. Soil classification and cohesion
Rationale: Soil classification, cohesion, internal friction, moisture
content, and other properties influence how well an excavation wall
can stand without collapsing. Cohesive soils may behave differently
from granular soils, and changing moisture conditions can
significantly reduce stability.
3. What should be done before excavating near known underground
utilities?
A. Begin digging with a backhoe at full depth
B. Remove all warning signs from the work area
C. Verify utility locations and mark them in the field
D. Assume utility drawings are completely accurate
Answer: C. Verify utility locations and mark them in the field
Rationale: Underground utilities must be identified and located before
excavation. Plans and records may not precisely represent field
,conditions, so utility locating and appropriate field verification are
essential. Excavation near utilities may also require careful hand
digging or other approved methods.
4. What is the primary purpose of a trench protective system?
A. To increase excavation production
B. To prevent cave-ins and protect workers
C. To reduce fuel consumption
D. To improve soil color
Answer: B. To prevent cave-ins and protect workers
Rationale: Protective systems such as sloping, benching, and trench
shields are intended to protect workers from soil collapse. Cave-ins
can occur suddenly and can result in serious injury or death, making
appropriate protection a critical excavation safety measure.
5. Which condition can significantly increase the likelihood of
excavation wall failure?
A. Dry, stable soil with no nearby loads
B. Water accumulation in the excavation
C. Properly controlled access
D. Clearly marked excavation boundaries
Answer: B. Water accumulation in the excavation
, Rationale: Water can weaken soil, increase its weight, reduce
cohesion, and contribute to erosion or instability. Excavations should
therefore be inspected and managed for groundwater, surface runoff,
rainfall, and other sources of water.
6. What is over-excavation?
A. Excavating less material than specified
B. Excavating beyond the specified depth or limits
C. Hauling material to an approved disposal site
D. Compacting fill to the specified density
Answer: B. Excavating beyond the specified depth or limits
Rationale: Over-excavation occurs when material is removed beyond
the design lines or grades. It can increase project costs and may
require approved backfill, structural fill, or other corrective work to
restore the required grade.
7. Why is proper excavation slope important?
A. It improves equipment paint adhesion
B. It reduces the possibility of soil collapse
C. It eliminates the need for inspections
D. It guarantees that no groundwater will be encountered
Answer: B. It reduces the possibility of soil collapse
