NPDES Level 1A Practice Test with practice questions
and answers
A slope gradient of 25% (4:1) would indicate that in a horizontal length of 100 feet, the vertical rise
would be ______ feet.
A) 2.5
B) 12.5
C) 25
D) 4 - CORRECT ANSWERS-C) 25
As rain falls to the earth, what is the very first function of vegetation?
A) It reduces detachment
B) It increases infiltration
C) It absorbs rain drop impact
D) Roots hold soil in place - CORRECT ANSWERS-A) It reduces detachment
Because of the likelihood of thunderstorms which is the worst month to schedule land disturbing
activities?
A) April
B) July
C) September
D) October - CORRECT ANSWERS-B) July
Which of the following is not a stage in Erosion and Sedimentation?
A) Detachment
B) Solubility
C) Transport
, D) Deposition - CORRECT ANSWERS-B) Solubility
At what depth must sediment be removed from a silt fence barrier?
A) 12 Inches
B) 16 Inches
C) 1/4 full
D) 1/2 full - CORRECT ANSWERS-D) 1/2 full
When straw mulch is used to cover disturbed soil it must be maintained at a depth of ________ inches.
A) 1-2
B) 1-3
C) 2-3
D) 2-4 - CORRECT ANSWERS-D) 2-4
If it is necessary to wash vehicle tires to remove excess sediment, the sediment run-off must be:
A) Kept at the construction exit pad
B) Filtered with hay bales
C) Directed away from the road with a diversion
D) Directed into an approved sediment trap or sediment basin - CORRECT ANSWERS-C) Directed away
from the road with a diversion
The maintenance requirements for all BMPs are only found in the Field Manual for Erosion and
Sediment Control in Georgia.
A) True
B) False - CORRECT ANSWERS-A) True
and answers
A slope gradient of 25% (4:1) would indicate that in a horizontal length of 100 feet, the vertical rise
would be ______ feet.
A) 2.5
B) 12.5
C) 25
D) 4 - CORRECT ANSWERS-C) 25
As rain falls to the earth, what is the very first function of vegetation?
A) It reduces detachment
B) It increases infiltration
C) It absorbs rain drop impact
D) Roots hold soil in place - CORRECT ANSWERS-A) It reduces detachment
Because of the likelihood of thunderstorms which is the worst month to schedule land disturbing
activities?
A) April
B) July
C) September
D) October - CORRECT ANSWERS-B) July
Which of the following is not a stage in Erosion and Sedimentation?
A) Detachment
B) Solubility
C) Transport
, D) Deposition - CORRECT ANSWERS-B) Solubility
At what depth must sediment be removed from a silt fence barrier?
A) 12 Inches
B) 16 Inches
C) 1/4 full
D) 1/2 full - CORRECT ANSWERS-D) 1/2 full
When straw mulch is used to cover disturbed soil it must be maintained at a depth of ________ inches.
A) 1-2
B) 1-3
C) 2-3
D) 2-4 - CORRECT ANSWERS-D) 2-4
If it is necessary to wash vehicle tires to remove excess sediment, the sediment run-off must be:
A) Kept at the construction exit pad
B) Filtered with hay bales
C) Directed away from the road with a diversion
D) Directed into an approved sediment trap or sediment basin - CORRECT ANSWERS-C) Directed away
from the road with a diversion
The maintenance requirements for all BMPs are only found in the Field Manual for Erosion and
Sediment Control in Georgia.
A) True
B) False - CORRECT ANSWERS-A) True
