NPDES LEVEL 1A PRACTICE TEST
QUESTIONS AND ANSWERS (GRADED
A+)
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 - ANSWER-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 - ANSWER-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 - ANSWER-B) July
Which of the following is not a stage in Erosion and Sedimentation?
A) Detachment
B) Solubility
C) Transport
D) Deposition - ANSWER-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 - ANSWER-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 - ANSWER-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 - ANSWER-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 - ANSWER-A) True
All land-disturbing activities covered by the E & SC Act must first secure a Land
Disturbing Activity (LDA) Permit. Who is responsible for obtaining this permit?
A) Design Engineer
B) Building Contractor
C) Owner/ Operator
D) Utility Subcontractor - ANSWER-C) Owner/ Operator
If the local issuing authority's enforcement officer observed a significant amount of
sediment entering state waters from a land disturbing activity the officer should do which
of the following?
A) Issue a strongly worded Notice of Violation
B) Start proceedings for Forfeiture of Bonding
C) Move to revoke the company's business license
D) Issue a Stop Work Order - ANSWER-D) Issue a Stop Work Order
Spillway pipe for a temporary sediment basin cannot be constructed with a pipe smaller
than _____ inches.
A) 6
B) 8
C) 10
D) 12 - ANSWER-B) 8
What is the amount of over fall allowed at the end of the storm drain outlet apron?
A) 1/2 the diameter of the rip rap used
B) Not to exceed 6 inches
C) 1/2 the thickness of the apron
D) Zero - ANSWER-D) Zero
What size rocks should be used to fill gabion boxes?
A) 3 to 4 inches
B) 4 to 8 inches
C) Larger than 8 inches
QUESTIONS AND ANSWERS (GRADED
A+)
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 - ANSWER-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 - ANSWER-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 - ANSWER-B) July
Which of the following is not a stage in Erosion and Sedimentation?
A) Detachment
B) Solubility
C) Transport
D) Deposition - ANSWER-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 - ANSWER-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 - ANSWER-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 - ANSWER-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 - ANSWER-A) True
All land-disturbing activities covered by the E & SC Act must first secure a Land
Disturbing Activity (LDA) Permit. Who is responsible for obtaining this permit?
A) Design Engineer
B) Building Contractor
C) Owner/ Operator
D) Utility Subcontractor - ANSWER-C) Owner/ Operator
If the local issuing authority's enforcement officer observed a significant amount of
sediment entering state waters from a land disturbing activity the officer should do which
of the following?
A) Issue a strongly worded Notice of Violation
B) Start proceedings for Forfeiture of Bonding
C) Move to revoke the company's business license
D) Issue a Stop Work Order - ANSWER-D) Issue a Stop Work Order
Spillway pipe for a temporary sediment basin cannot be constructed with a pipe smaller
than _____ inches.
A) 6
B) 8
C) 10
D) 12 - ANSWER-B) 8
What is the amount of over fall allowed at the end of the storm drain outlet apron?
A) 1/2 the diameter of the rip rap used
B) Not to exceed 6 inches
C) 1/2 the thickness of the apron
D) Zero - ANSWER-D) Zero
What size rocks should be used to fill gabion boxes?
A) 3 to 4 inches
B) 4 to 8 inches
C) Larger than 8 inches
