NPDES LEVEL 1A PRACTICE TEST QUESTIONS AND CORRECT ANSWERS LATEST UPDATE

NPDES LEVEL 1A PRACTICE TEST QUESTIONS
AND CORRECT ANSWERS LATEST 2025-2026
UPDATE


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
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