Erosion and Sediment Control
EXAMINATION SET 2026 SOLVED
QUESTIONS GRADED A+
● Site NOT at Final Grade. Answer: - stabilize in 14 days
- temporarily seed
- mulch
- permanently stabilize if dormant > 1 year
● Site at Final Grade. Answer: - stabilize in 7 days (recommended
immediately)
- permanently or temporarily seed and mulch
- mulch/matting/straw
● Minimum Standard 2. Answer: Stock Piles, Waste and Borrow Areas
during construction, soil stock piles and borrow areas shall be stabilized
or protected with sediment trapping measures
mulch prevents erosion by protecting the surface from raindrop impact
and silt fence intercepts and detains from disturbed areas
,● Minimum Standard 3. Answer: Permanent Vegetation
permanent vegetation cover shall be established on denuded areas not
otherwise permanently stabilized (permanent vegetation shall not be
considered established until a ground cover is achieved that is uniform,
mature enough to survive, and will inhibit erosion *there is no %
associated with this*)
reduce erosion and decrease sediment yield from disturbed area
this is the standard used to verify that a site is ready for release of bonds
or surety
● Minimum Standard 4. Answer: First-Step Measures
Sediment basins and traps, perimeter dikes, sediment barriers and other
measures intended to trap sediment shall be constructed as a first step in
any land-disturbing activity and shall be made functional before upslope
land disturbance takes place
a certain amount of initial land disturbance may be required to provide
access for equipment to install the perimeter controls, but site clearing
and grading should be kept to a minimum until the perimeter controls
are in place
,intercepts and detains small amounts of sediment from disturbed areas
during construction operation to prevent sediment from leaving the site
and decrease velocity of sheet flows and low-to-moderate level channel
flow
● Perimeter Controls. Answer: assures that sediment does not leave the
perimeter of the land-disturbing area once site clearing, grading, and
construction commences
Examples: silt fences, sediment traps, sediment basins, construction
entrance, temporary diversions, diversions
● Minimum Standard 5. Answer: Earthen Structure Stabilization
stabilization measures shall be applied to earthen structures such as
dams, dikes, and diversions immediately after installation
reduce erosion and sedimentation and reduce damage from sediment and
runoff to downstream or off-site areas
● Minimum Standard 6. Answer: Traps and Basins
sediment traps and basins shall be designed and constructed based upon
the total drainage area (not just disturbed area) to be served by the trap
or basin
, ● Sediment Traps. Answer: minimum storage capacity shall be 134
cubic yards per acre of drainage area and shall only control drainage
areas less than 3 acres
*stone outlet = trap*
● Sediment Basins. Answer: surface runoff from disturbed areas that is
comprised of flow from drainage areas greater than or equal to 3 acres
shall be controlled by a basin; minimum storage capacity of a sediment
basin shall be 134 cubic yards per acre of drainage area; the outfall
system shall, at a minimum, maintain the structural integrity of the basin
during a 25-year storm of 24-hour duration; runoff coefficients used in
runoff calculations shall correspond to a bare earth condition or those
conditions expected to exist while the sediment basin is utilized.
● Sediment Trapping Devises. Answer: 1. place near the lowest
drainage points of a project
2. install as a first-step measure [MS-4]
3. stabilize immediately [MS-5]
4. must include outlet protection for basins [MS-11]
EXAMINATION SET 2026 SOLVED
QUESTIONS GRADED A+
● Site NOT at Final Grade. Answer: - stabilize in 14 days
- temporarily seed
- mulch
- permanently stabilize if dormant > 1 year
● Site at Final Grade. Answer: - stabilize in 7 days (recommended
immediately)
- permanently or temporarily seed and mulch
- mulch/matting/straw
● Minimum Standard 2. Answer: Stock Piles, Waste and Borrow Areas
during construction, soil stock piles and borrow areas shall be stabilized
or protected with sediment trapping measures
mulch prevents erosion by protecting the surface from raindrop impact
and silt fence intercepts and detains from disturbed areas
,● Minimum Standard 3. Answer: Permanent Vegetation
permanent vegetation cover shall be established on denuded areas not
otherwise permanently stabilized (permanent vegetation shall not be
considered established until a ground cover is achieved that is uniform,
mature enough to survive, and will inhibit erosion *there is no %
associated with this*)
reduce erosion and decrease sediment yield from disturbed area
this is the standard used to verify that a site is ready for release of bonds
or surety
● Minimum Standard 4. Answer: First-Step Measures
Sediment basins and traps, perimeter dikes, sediment barriers and other
measures intended to trap sediment shall be constructed as a first step in
any land-disturbing activity and shall be made functional before upslope
land disturbance takes place
a certain amount of initial land disturbance may be required to provide
access for equipment to install the perimeter controls, but site clearing
and grading should be kept to a minimum until the perimeter controls
are in place
,intercepts and detains small amounts of sediment from disturbed areas
during construction operation to prevent sediment from leaving the site
and decrease velocity of sheet flows and low-to-moderate level channel
flow
● Perimeter Controls. Answer: assures that sediment does not leave the
perimeter of the land-disturbing area once site clearing, grading, and
construction commences
Examples: silt fences, sediment traps, sediment basins, construction
entrance, temporary diversions, diversions
● Minimum Standard 5. Answer: Earthen Structure Stabilization
stabilization measures shall be applied to earthen structures such as
dams, dikes, and diversions immediately after installation
reduce erosion and sedimentation and reduce damage from sediment and
runoff to downstream or off-site areas
● Minimum Standard 6. Answer: Traps and Basins
sediment traps and basins shall be designed and constructed based upon
the total drainage area (not just disturbed area) to be served by the trap
or basin
, ● Sediment Traps. Answer: minimum storage capacity shall be 134
cubic yards per acre of drainage area and shall only control drainage
areas less than 3 acres
*stone outlet = trap*
● Sediment Basins. Answer: surface runoff from disturbed areas that is
comprised of flow from drainage areas greater than or equal to 3 acres
shall be controlled by a basin; minimum storage capacity of a sediment
basin shall be 134 cubic yards per acre of drainage area; the outfall
system shall, at a minimum, maintain the structural integrity of the basin
during a 25-year storm of 24-hour duration; runoff coefficients used in
runoff calculations shall correspond to a bare earth condition or those
conditions expected to exist while the sediment basin is utilized.
● Sediment Trapping Devises. Answer: 1. place near the lowest
drainage points of a project
2. install as a first-step measure [MS-4]
3. stabilize immediately [MS-5]
4. must include outlet protection for basins [MS-11]
