VA DEQ ESC Inspector Exam Questions
And Correct Answers With Rationales
2026
1. The main goal of erosion and sediment control is to:
A. Increase soil fertility
B. Reduce air pollution
C. Prevent sediment from leaving a construction site
D. Promote plant growth
Rationale: ESC programs aim to prevent off-site sedimentation
caused by land-disturbing activities.
2. Which law provides the authority for Virginia’s erosion and
sediment control program?
A. Clean Water Act
B. Virginia Erosion and Sediment Control Law
C. National Environmental Policy Act
D. Chesapeake Bay Preservation Act
Rationale: The Virginia ESC Law establishes statewide erosion and
sediment control requirements.
3. A land-disturbing activity is defined as disturbing how many
square feet or more?
A. 1,000 square feet
, B. 5,000 square feet
C. 10,000 square feet
D. 20,000 square feet
Rationale: In most Virginia localities, the threshold for requiring an
ESC plan is 10,000 square feet.
4. The term “responsible land disturber” (RLD) refers to:
A. The property owner only
B. An individual certified to ensure compliance with ESC
regulations
C. A local building inspector
D. A DEQ permit writer
Rationale: RLDs are certified individuals responsible for regulatory
compliance on a site.
5. The best time to install sediment control measures is:
A. After grading is complete
B. During final stabilization
C. Before land disturbance begins
D. After the first rainfall
Rationale: Preventive installation is critical to control sediment
from the start of activity.
6. The most effective method of controlling erosion is:
A. Silt fencing
B. Minimizing the area of disturbance
C. Riprap
D. Mulching
Rationale: Limiting disturbed areas reduces erosion potential more
than post-disturbance measures.
, 7. Which of the following is a temporary stabilization measure?
A. Permanent seeding
B. Riprap channel lining
C. Mulching
D. Sod installation
Rationale: Mulching protects soil temporarily until vegetation can
be established.
8. A silt fence is primarily used to:
A. Control runoff velocity
B. Trap sediment in sheet flow
C. Divert stormwater
D. Reinforce slopes
Rationale: Silt fences slow sheet flow and capture sediment before
leaving the site.
9. The maximum slope length contributing to a silt fence should be:
A. 100 feet for gentle slopes
B. 250 feet
C. 400 feet
D. Unlimited
Rationale: DEQ specifications limit contributing slope length to
ensure fence effectiveness.
10. The purpose of a sediment basin is to:
A. Filter stormwater
B. Allow sediment to settle out of runoff
C. Divert water away from disturbed areas
D. Store clean water for reuse
And Correct Answers With Rationales
2026
1. The main goal of erosion and sediment control is to:
A. Increase soil fertility
B. Reduce air pollution
C. Prevent sediment from leaving a construction site
D. Promote plant growth
Rationale: ESC programs aim to prevent off-site sedimentation
caused by land-disturbing activities.
2. Which law provides the authority for Virginia’s erosion and
sediment control program?
A. Clean Water Act
B. Virginia Erosion and Sediment Control Law
C. National Environmental Policy Act
D. Chesapeake Bay Preservation Act
Rationale: The Virginia ESC Law establishes statewide erosion and
sediment control requirements.
3. A land-disturbing activity is defined as disturbing how many
square feet or more?
A. 1,000 square feet
, B. 5,000 square feet
C. 10,000 square feet
D. 20,000 square feet
Rationale: In most Virginia localities, the threshold for requiring an
ESC plan is 10,000 square feet.
4. The term “responsible land disturber” (RLD) refers to:
A. The property owner only
B. An individual certified to ensure compliance with ESC
regulations
C. A local building inspector
D. A DEQ permit writer
Rationale: RLDs are certified individuals responsible for regulatory
compliance on a site.
5. The best time to install sediment control measures is:
A. After grading is complete
B. During final stabilization
C. Before land disturbance begins
D. After the first rainfall
Rationale: Preventive installation is critical to control sediment
from the start of activity.
6. The most effective method of controlling erosion is:
A. Silt fencing
B. Minimizing the area of disturbance
C. Riprap
D. Mulching
Rationale: Limiting disturbed areas reduces erosion potential more
than post-disturbance measures.
, 7. Which of the following is a temporary stabilization measure?
A. Permanent seeding
B. Riprap channel lining
C. Mulching
D. Sod installation
Rationale: Mulching protects soil temporarily until vegetation can
be established.
8. A silt fence is primarily used to:
A. Control runoff velocity
B. Trap sediment in sheet flow
C. Divert stormwater
D. Reinforce slopes
Rationale: Silt fences slow sheet flow and capture sediment before
leaving the site.
9. The maximum slope length contributing to a silt fence should be:
A. 100 feet for gentle slopes
B. 250 feet
C. 400 feet
D. Unlimited
Rationale: DEQ specifications limit contributing slope length to
ensure fence effectiveness.
10. The purpose of a sediment basin is to:
A. Filter stormwater
B. Allow sediment to settle out of runoff
C. Divert water away from disturbed areas
D. Store clean water for reuse
