1|Page
NPDES Level 1A exam National Pollutant Discharge
Elimination System ACTUAL VERIFIED QUESTIONS
AND CORRECT DETAILED ANSWERS LATEST
UPDATE.pdf
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?
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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
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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
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
, 4|Page
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
NPDES Level 1A exam National Pollutant Discharge
Elimination System ACTUAL VERIFIED QUESTIONS
AND CORRECT DETAILED ANSWERS LATEST
UPDATE.pdf
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?
,2|Page
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
,3|Page
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
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
, 4|Page
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
