Page 1 of 22
NPDES CLASS EXAM | FREQUENTLY TESTED
QUESTIONS WITH CORRECT ANSWERS |
BRAND NEW!
Erosion - ✔✔✔ Correct Answer > is the process by which the land
surface is worn away by the action of wind, water, and gravity.
In tidal and/or wind and wave conditions there should be a ___-
foot gap between bottom of the curtain and the floor of the water
body at mean low water. - ✔✔✔ Correct Answer > one
Sediments shall be allowed to settle a minimum of 72 hours prior
to removal of the turbidity curtain (True/False). - ✔✔✔ Correct Answer
> False
What are the three purposes of soil roughening? - ✔✔✔ Correct
Answer > aid in establishment of vegetative cover; reduce runoff
velocity & increase infiltration, and reduce erosion and provide
for sediment trapping.
,Page 2 of 22
The purpose of ____ is to provide a suitable growth medium for
final site stabilization with vegetation. - ✔✔✔ Correct Answer >
Topsoiling
The subgrade should be prepared by ____ or ____ to insure
bonding of the topsoil with the subsoil. - ✔✔✔ Correct Answer >
discing or scarifying
Areas that are at rough grade for 14 days or more should receive
____ seeding immediately. - ✔✔✔ Correct Answer > temporary
List three soil conditioners: - ✔✔✔ Correct Answer > peat, sand,
vermiculite, rotted manure, rotted sawdust, treated sewage
sludge (biosolids).
Name the two soil amendments usually required prior to
permanent seeding: - ✔✔✔ Correct Answer > fertilizer and lime.
A stand of vegetation is considered fully established after ___
year. - ✔✔✔ Correct Answer > one
When sodding a slope, strips should be laid (along/ perpendicular
to) the contour. Joints should be (staggered/ in line). Start from
, Page 3 of 22
the ___ and ____ toward the top. - ✔✔✔ Correct Answer > along,
staggered, Bottom and work
List three beneficial functions of mulch: - ✔✔✔ Correct Answer > 1)
Protects soil from raindrop erosion, 2) Moderates soil
temperature, 3) Moderates soil moisture, 4) Reduces velocity of
overland flow, 4) Improves soil texture and/or nutrients, 5)
Control/reduce weeds.
Straw mulch should be applied at rate of ____ lbs. per 1000 sq. ft.;
_____ bales per 1000 sq. ft.; or _____ tons per acre. - ✔✔✔ Correct
Answer > 70 - 90 lbs, 1.5-2 bales, or 1.5-2
When installing erosion control nets or blankets, work from the
___ towards the _____. - ✔✔✔ Correct Answer > top, bottom
Effective tree protection should be installed no closer than _ feet
from the trunk or the _____ of the tree. - ✔✔✔ Correct Answer > 8, drip
line
A good place for material storage, parking, and portable toilets is
inside the tree protection zone. (True / False). - ✔✔✔ Correct Answer >
False
NPDES CLASS EXAM | FREQUENTLY TESTED
QUESTIONS WITH CORRECT ANSWERS |
BRAND NEW!
Erosion - ✔✔✔ Correct Answer > is the process by which the land
surface is worn away by the action of wind, water, and gravity.
In tidal and/or wind and wave conditions there should be a ___-
foot gap between bottom of the curtain and the floor of the water
body at mean low water. - ✔✔✔ Correct Answer > one
Sediments shall be allowed to settle a minimum of 72 hours prior
to removal of the turbidity curtain (True/False). - ✔✔✔ Correct Answer
> False
What are the three purposes of soil roughening? - ✔✔✔ Correct
Answer > aid in establishment of vegetative cover; reduce runoff
velocity & increase infiltration, and reduce erosion and provide
for sediment trapping.
,Page 2 of 22
The purpose of ____ is to provide a suitable growth medium for
final site stabilization with vegetation. - ✔✔✔ Correct Answer >
Topsoiling
The subgrade should be prepared by ____ or ____ to insure
bonding of the topsoil with the subsoil. - ✔✔✔ Correct Answer >
discing or scarifying
Areas that are at rough grade for 14 days or more should receive
____ seeding immediately. - ✔✔✔ Correct Answer > temporary
List three soil conditioners: - ✔✔✔ Correct Answer > peat, sand,
vermiculite, rotted manure, rotted sawdust, treated sewage
sludge (biosolids).
Name the two soil amendments usually required prior to
permanent seeding: - ✔✔✔ Correct Answer > fertilizer and lime.
A stand of vegetation is considered fully established after ___
year. - ✔✔✔ Correct Answer > one
When sodding a slope, strips should be laid (along/ perpendicular
to) the contour. Joints should be (staggered/ in line). Start from
, Page 3 of 22
the ___ and ____ toward the top. - ✔✔✔ Correct Answer > along,
staggered, Bottom and work
List three beneficial functions of mulch: - ✔✔✔ Correct Answer > 1)
Protects soil from raindrop erosion, 2) Moderates soil
temperature, 3) Moderates soil moisture, 4) Reduces velocity of
overland flow, 4) Improves soil texture and/or nutrients, 5)
Control/reduce weeds.
Straw mulch should be applied at rate of ____ lbs. per 1000 sq. ft.;
_____ bales per 1000 sq. ft.; or _____ tons per acre. - ✔✔✔ Correct
Answer > 70 - 90 lbs, 1.5-2 bales, or 1.5-2
When installing erosion control nets or blankets, work from the
___ towards the _____. - ✔✔✔ Correct Answer > top, bottom
Effective tree protection should be installed no closer than _ feet
from the trunk or the _____ of the tree. - ✔✔✔ Correct Answer > 8, drip
line
A good place for material storage, parking, and portable toilets is
inside the tree protection zone. (True / False). - ✔✔✔ Correct Answer >
False
