Maryland Excavation Competent Person
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
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1. During a trenching operation for a utility installation project in
Maryland, an excavation competent person observes tension cracks
forming approximately 3 feet from the edge of a 12-foot-deep trench
excavated in Type C soil after heavy rainfall. Workers are currently
inside the trench installing pipe sections. According to OSHA
excavation safety requirements and competent person
responsibilities, what is the MOST appropriate immediate action?
A. Continue work while monitoring the trench because cracks outside the
spoil pile are common in wet conditions
B. Instruct workers to move away from the trench wall but remain inside the
excavation until pipe installation is completed
C. Order all employees to exit the trench immediately and reassess the
excavation for protective system modifications
D. Place additional spoil material near the trench edge to stabilize the
surrounding soil
The formation of tension cracks near an excavation edge is a serious
indication of impending soil failure, especially in saturated Type C soil. A
,competent person must immediately remove workers from danger and
reevaluate protective systems before work resumes.
2. An excavation competent person is conducting a soil classification test
on a jobsite where cohesive soil appears stable but breaks apart easily
when disturbed. During a plasticity test, the soil cannot be rolled into a
1/8-inch thread without crumbling. Based on OSHA soil classification
methods, how should this soil MOST likely be classified?
A. Stable rock
B. Type A soil
C. Type B soil
D. Type C soil
Soil that cannot maintain cohesion during a plasticity test lacks the
characteristics required for Type A or many Type B classifications. Granular
or non-cohesive soils are classified as Type C, which requires the greatest
protective measures.
3. A contractor excavates a trench 6 feet deep alongside a roadway. The
competent person notices that spoil piles have been placed directly at
the trench edge to reduce hauling distance. Which hazard is MOST
directly created by this practice?
A. Reduced trench visibility for equipment operators
B. Increased atmospheric contamination inside the trench
C. Additional surcharge loads that increase the likelihood of cave-ins
D. Reduced soil moisture content near the excavation
Spoil piles placed too close to trench edges create surcharge loads that
increase lateral pressure on trench walls, significantly increasing the risk of
collapse. OSHA requires spoil piles to be kept at least 2 feet from the
excavation edge.
4. A crew is installing sewer pipe in a trench exceeding 20 feet in depth.
The excavation protective system was selected by the superintendent
based on previous experience rather than engineering documentation.
, According to OSHA requirements, what additional requirement applies
to this trench depth?
A. The trench must be inspected every 30 minutes
B. Workers must wear full-body harnesses at all times
C. Hydraulic shoring must always be used
D. A registered professional engineer must design the protective system
Protective systems for excavations deeper than 20 feet must be designed
or approved by a registered professional engineer because of the increased
complexity and hazards associated with deep excavations.
5. During excavation work near underground utilities, the competent
person receives conflicting information regarding the exact location of
an electrical conduit. What should occur BEFORE mechanical
excavation continues in the area?
A. Workers should probe manually while excavation continues nearby
B. Excavation should proceed carefully using smaller equipment
C. The utility location should be positively identified through safe exposure
methods before continuing
D. The conduit should be assumed inactive if no surface markings are visible
When utility locations are uncertain, excavation operations must stop until
utilities are accurately located using safe methods such as potholing or
hand digging to prevent electrocution, explosions, or service disruption.
6. An excavation competent person determines that groundwater
seepage is entering a trench despite the use of sloping techniques.
Workers report that the trench bottom feels unstable and muddy.
What is the MOST appropriate corrective action?
A. Continue work if workers remain alert for changes
B. Add additional workers to complete the task faster
C. Increase spoil pile height to absorb excess moisture
D. Implement water removal and stabilization measures before allowing
reentry
, Water accumulation greatly reduces soil stability and increases cave-in
hazards. OSHA requires water hazards to be controlled through
dewatering, support systems, or other protective measures before
employees may enter.
7. A trench box is being used in a 10-foot trench. The competent person
notices that workers are exiting the protected area to retrieve tools
stored outside the trench shield. Why is this practice dangerous?
A. Trench shields reduce visibility for workers
B. Tools stored outside the trench violate OSHA housekeeping rules
C. Workers outside the shield are exposed to unprotected cave-in hazards
D. The shield can shift if workers move too frequently
Trench shields only protect workers located within the shielded area.
Employees who leave the protected zone become exposed to potentially
fatal cave-in hazards.
8. A competent person inspects an excavation at the start of a shift
following an overnight rainstorm. Which condition would require
workers to remain out of the excavation until corrected?
A. Minor mud accumulation near the trench ladder
B. Slight discoloration of trench walls
C. Presence of standing water less than 1 inch deep
D. Evidence of sloughing, bulging, or soil movement along trench walls
Signs of sloughing or wall movement indicate imminent trench instability
and possible collapse. OSHA requires immediate correction and
reevaluation before worker entry.
9. Which statement BEST describes the primary responsibility of an
excavation competent person under OSHA standards?
A. Operating excavation equipment safely
B. Preparing daily production reports
C. Supervising utility installation activities
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. During a trenching operation for a utility installation project in
Maryland, an excavation competent person observes tension cracks
forming approximately 3 feet from the edge of a 12-foot-deep trench
excavated in Type C soil after heavy rainfall. Workers are currently
inside the trench installing pipe sections. According to OSHA
excavation safety requirements and competent person
responsibilities, what is the MOST appropriate immediate action?
A. Continue work while monitoring the trench because cracks outside the
spoil pile are common in wet conditions
B. Instruct workers to move away from the trench wall but remain inside the
excavation until pipe installation is completed
C. Order all employees to exit the trench immediately and reassess the
excavation for protective system modifications
D. Place additional spoil material near the trench edge to stabilize the
surrounding soil
The formation of tension cracks near an excavation edge is a serious
indication of impending soil failure, especially in saturated Type C soil. A
,competent person must immediately remove workers from danger and
reevaluate protective systems before work resumes.
2. An excavation competent person is conducting a soil classification test
on a jobsite where cohesive soil appears stable but breaks apart easily
when disturbed. During a plasticity test, the soil cannot be rolled into a
1/8-inch thread without crumbling. Based on OSHA soil classification
methods, how should this soil MOST likely be classified?
A. Stable rock
B. Type A soil
C. Type B soil
D. Type C soil
Soil that cannot maintain cohesion during a plasticity test lacks the
characteristics required for Type A or many Type B classifications. Granular
or non-cohesive soils are classified as Type C, which requires the greatest
protective measures.
3. A contractor excavates a trench 6 feet deep alongside a roadway. The
competent person notices that spoil piles have been placed directly at
the trench edge to reduce hauling distance. Which hazard is MOST
directly created by this practice?
A. Reduced trench visibility for equipment operators
B. Increased atmospheric contamination inside the trench
C. Additional surcharge loads that increase the likelihood of cave-ins
D. Reduced soil moisture content near the excavation
Spoil piles placed too close to trench edges create surcharge loads that
increase lateral pressure on trench walls, significantly increasing the risk of
collapse. OSHA requires spoil piles to be kept at least 2 feet from the
excavation edge.
4. A crew is installing sewer pipe in a trench exceeding 20 feet in depth.
The excavation protective system was selected by the superintendent
based on previous experience rather than engineering documentation.
, According to OSHA requirements, what additional requirement applies
to this trench depth?
A. The trench must be inspected every 30 minutes
B. Workers must wear full-body harnesses at all times
C. Hydraulic shoring must always be used
D. A registered professional engineer must design the protective system
Protective systems for excavations deeper than 20 feet must be designed
or approved by a registered professional engineer because of the increased
complexity and hazards associated with deep excavations.
5. During excavation work near underground utilities, the competent
person receives conflicting information regarding the exact location of
an electrical conduit. What should occur BEFORE mechanical
excavation continues in the area?
A. Workers should probe manually while excavation continues nearby
B. Excavation should proceed carefully using smaller equipment
C. The utility location should be positively identified through safe exposure
methods before continuing
D. The conduit should be assumed inactive if no surface markings are visible
When utility locations are uncertain, excavation operations must stop until
utilities are accurately located using safe methods such as potholing or
hand digging to prevent electrocution, explosions, or service disruption.
6. An excavation competent person determines that groundwater
seepage is entering a trench despite the use of sloping techniques.
Workers report that the trench bottom feels unstable and muddy.
What is the MOST appropriate corrective action?
A. Continue work if workers remain alert for changes
B. Add additional workers to complete the task faster
C. Increase spoil pile height to absorb excess moisture
D. Implement water removal and stabilization measures before allowing
reentry
, Water accumulation greatly reduces soil stability and increases cave-in
hazards. OSHA requires water hazards to be controlled through
dewatering, support systems, or other protective measures before
employees may enter.
7. A trench box is being used in a 10-foot trench. The competent person
notices that workers are exiting the protected area to retrieve tools
stored outside the trench shield. Why is this practice dangerous?
A. Trench shields reduce visibility for workers
B. Tools stored outside the trench violate OSHA housekeeping rules
C. Workers outside the shield are exposed to unprotected cave-in hazards
D. The shield can shift if workers move too frequently
Trench shields only protect workers located within the shielded area.
Employees who leave the protected zone become exposed to potentially
fatal cave-in hazards.
8. A competent person inspects an excavation at the start of a shift
following an overnight rainstorm. Which condition would require
workers to remain out of the excavation until corrected?
A. Minor mud accumulation near the trench ladder
B. Slight discoloration of trench walls
C. Presence of standing water less than 1 inch deep
D. Evidence of sloughing, bulging, or soil movement along trench walls
Signs of sloughing or wall movement indicate imminent trench instability
and possible collapse. OSHA requires immediate correction and
reevaluation before worker entry.
9. Which statement BEST describes the primary responsibility of an
excavation competent person under OSHA standards?
A. Operating excavation equipment safely
B. Preparing daily production reports
C. Supervising utility installation activities
