NPDES Level 1A – Practice Test Questions and Answers, Complete Exam Material

NPDES Level 1A Practice Test
Questions And Correct 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

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

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

B) July




Which of the following is not a stage in Erosion and Sedimentation?

A) Detachment

B) Solubility

C) Transport

D) Deposition

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

D) 1/2 full




When straw mulch is used to cover disturbed soil it must be maintained at a depth of
________ inches.