NPDES CLASS QUESTIONS AND
ANSWERS (GRADED A+)
Erosion - ANSWER-is the process by which the land surface is worn away by the action
of wind, water, and gravity.
Sedimentation - ANSWER-is the settling out of soil particles transported by water and
wind.
Soil erosion can be classified as 2 types. What are they? - ANSWER-Wind and Water.
What are the two sources of Soil erosion. - ANSWER-Natural and Manmade
Water erosion can be classified as two type of erosions. What are they? - ANSWER-
Overland and Stream/Channel erosion.
Four process of overland erosion are? - ANSWER-Splash, sheet, rill, and gully erosion.
Four principle factors influencing soil erosion are? - ANSWER-Soil characteristics,
vegetative cover, topography, and climate.
List three physical effect of erosion and sedimentation: - ANSWER-Increased flooding
reduced hydraulic capacity in rivers, and streams; increased maintenance of stormwater
systems.; increased water treatments cost; and decreased recreational value.
List three biological effect of erosion and sedimentation: - ANSWER-Reduced light for
aquatic plants; clogs fish gills; impairs spawning; disrupts food chain; blankets bottom,
suppresses aquatic life; and disrupts ecosystem.
Planning the development to fit the terrain using the particular: - ANSWER-Topography;
soils; drainage patterns; natural vegetation of the site; and minimize the extent of the
area exposed at one time and the duration of exposure.
Perimeter Control Practices - ANSWER-What you apply to protect the disturbed area
from off-site runoff and to protect off-site areas from sediment damage.
Erosion Control Practices - ANSWER-What you apply to prevent excessive on-site
damage.
Keep runoff velocities _____ and _______ runoff on the site - ANSWER-Low and retain
When do you stabilize disturbed areas after final grading to prevent raindrop impacts
from causing erosion. - ANSWER-Immediately
, Implement a thorough _____ and _____(inspection) program as required in the
Construction Generic Permit (CGP). - ANSWER-maintenance and follow up
Soil particles smaller than 0.002 mm are classified as ____ and along with ____ are the
two soil types that cause the most erosion/turbidity problems in Florida and the World. -
ANSWER-clay and muck
Soils in the Type A hydrologic group have ____ infiltration rates and ____ runoff
potential even when thoroughly wetted. - ANSWER-high and low
Soils in the Type D hydrologic group have very ____ infiltration rates and ____ runoff
potential when thoroughly wetted. - ANSWER-low and high
What is the rainfall erosion index? - ANSWER-The rainfall erosion index is the only
factor in the Universal Soil Loss Equation which is beyond the developer's control.
What are the factors that can most easily be manipulated by the developer? -
ANSWER-length & gradient, and cover factor
The RUSLE is used on our construction sites to predict______ - ANSWER-Soil Loss
Stabilize disturbed lands immediately to save what? - ANSWER-Money
Who can you contact for a soil survey information? FDOT, FDEP, Water Management
District, Mayor's Office, or NRCS. - ANSWER-NRCS
What are the five soil forming factors? - ANSWER-Climate, topography, organisms,
parent material, and time.
Waste disposal is a problem for the individual workers and some subcontractors, but it's
no big deal (True / False). - ANSWER-False
Truck washing should be done in a designated area, not near the perimeter controls.
(True / False). - ANSWER-True
Storage of paints, solvents, cements, pesticides, acids, or other potentially polluting
chemicals is no big deal because they are only stored temporarily and get used up
quickly. (True / False). - ANSWER-False
The public needs to understand that dust is just a normal part of construction. (True /
False). - ANSWER-False
A temporary gravel construction entrance must extend the full width of the entrance. It
must be at least ____ feet long and at least ____ inches thick. Aggregate should be
____ in. stone or FDOT No. ____ stone. Prior to installing the gravel, a ____ should be
ANSWERS (GRADED A+)
Erosion - ANSWER-is the process by which the land surface is worn away by the action
of wind, water, and gravity.
Sedimentation - ANSWER-is the settling out of soil particles transported by water and
wind.
Soil erosion can be classified as 2 types. What are they? - ANSWER-Wind and Water.
What are the two sources of Soil erosion. - ANSWER-Natural and Manmade
Water erosion can be classified as two type of erosions. What are they? - ANSWER-
Overland and Stream/Channel erosion.
Four process of overland erosion are? - ANSWER-Splash, sheet, rill, and gully erosion.
Four principle factors influencing soil erosion are? - ANSWER-Soil characteristics,
vegetative cover, topography, and climate.
List three physical effect of erosion and sedimentation: - ANSWER-Increased flooding
reduced hydraulic capacity in rivers, and streams; increased maintenance of stormwater
systems.; increased water treatments cost; and decreased recreational value.
List three biological effect of erosion and sedimentation: - ANSWER-Reduced light for
aquatic plants; clogs fish gills; impairs spawning; disrupts food chain; blankets bottom,
suppresses aquatic life; and disrupts ecosystem.
Planning the development to fit the terrain using the particular: - ANSWER-Topography;
soils; drainage patterns; natural vegetation of the site; and minimize the extent of the
area exposed at one time and the duration of exposure.
Perimeter Control Practices - ANSWER-What you apply to protect the disturbed area
from off-site runoff and to protect off-site areas from sediment damage.
Erosion Control Practices - ANSWER-What you apply to prevent excessive on-site
damage.
Keep runoff velocities _____ and _______ runoff on the site - ANSWER-Low and retain
When do you stabilize disturbed areas after final grading to prevent raindrop impacts
from causing erosion. - ANSWER-Immediately
, Implement a thorough _____ and _____(inspection) program as required in the
Construction Generic Permit (CGP). - ANSWER-maintenance and follow up
Soil particles smaller than 0.002 mm are classified as ____ and along with ____ are the
two soil types that cause the most erosion/turbidity problems in Florida and the World. -
ANSWER-clay and muck
Soils in the Type A hydrologic group have ____ infiltration rates and ____ runoff
potential even when thoroughly wetted. - ANSWER-high and low
Soils in the Type D hydrologic group have very ____ infiltration rates and ____ runoff
potential when thoroughly wetted. - ANSWER-low and high
What is the rainfall erosion index? - ANSWER-The rainfall erosion index is the only
factor in the Universal Soil Loss Equation which is beyond the developer's control.
What are the factors that can most easily be manipulated by the developer? -
ANSWER-length & gradient, and cover factor
The RUSLE is used on our construction sites to predict______ - ANSWER-Soil Loss
Stabilize disturbed lands immediately to save what? - ANSWER-Money
Who can you contact for a soil survey information? FDOT, FDEP, Water Management
District, Mayor's Office, or NRCS. - ANSWER-NRCS
What are the five soil forming factors? - ANSWER-Climate, topography, organisms,
parent material, and time.
Waste disposal is a problem for the individual workers and some subcontractors, but it's
no big deal (True / False). - ANSWER-False
Truck washing should be done in a designated area, not near the perimeter controls.
(True / False). - ANSWER-True
Storage of paints, solvents, cements, pesticides, acids, or other potentially polluting
chemicals is no big deal because they are only stored temporarily and get used up
quickly. (True / False). - ANSWER-False
The public needs to understand that dust is just a normal part of construction. (True /
False). - ANSWER-False
A temporary gravel construction entrance must extend the full width of the entrance. It
must be at least ____ feet long and at least ____ inches thick. Aggregate should be
____ in. stone or FDOT No. ____ stone. Prior to installing the gravel, a ____ should be
