Erosion and Sediment Control
Minimum Standard 1 - ✔✔ correct answer Stabilization
permanent or temporary soil stabilization shall be applied to denuded areas within seven days after
final grade is reached on any portion of the site; temporary soil stabilization shall be applied within
seven days to denuded areas that may not be at final grade but will remain dormant for longer than
14 days; permanent stabilization shall be applied to areas that are to be left dormant for more than
one year
Site NOT at Final Grade - ✔✔ correct answer - stabilize in 14 days
- temporarily seed
- mulch
- permanently stabilize if dormant > 1 year
Site at Final Grade - ✔✔ correct answer - stabilize in 7 days (recommended immediately)
- permanently or temporarily seed and mulch
- mulch/matting/straw
Minimum Standard 2 - ✔✔ correct 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 - ✔✔ correct 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
,Erosion and Sediment Control
this is the standard used to verify that a site is ready for release of bonds or surety
Minimum Standard 4 - ✔✔ correct 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 - ✔✔ correct 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 - ✔✔ correct 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 - ✔✔ correct 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
, Erosion and Sediment Control
Sediment Traps - ✔✔ correct 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 - ✔✔ correct 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 - ✔✔ correct 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]
Minimum Standard 7 - ✔✔ correct answer Cut and Fill Slopes
roughening the surface of the slope decreases runoff, lowers the velocity runoff, increases water
retention, and leads to better seed germination
slopes that are found to be eroding excessively within on year of permanent stabilization shall be
provided with additional slop stabilizing measures until the problem is corrected
Minimum Standard 8 - ✔✔ correct answer Concentrated Runoff
shall not flow down cut or fill slopes unless contained within an adequate temporary or permanent
channel, flume or slope drain structure
outlets of these drains need outlet protection to prevent erosion from the concentrated flow
Minimum Standard 1 - ✔✔ correct answer Stabilization
permanent or temporary soil stabilization shall be applied to denuded areas within seven days after
final grade is reached on any portion of the site; temporary soil stabilization shall be applied within
seven days to denuded areas that may not be at final grade but will remain dormant for longer than
14 days; permanent stabilization shall be applied to areas that are to be left dormant for more than
one year
Site NOT at Final Grade - ✔✔ correct answer - stabilize in 14 days
- temporarily seed
- mulch
- permanently stabilize if dormant > 1 year
Site at Final Grade - ✔✔ correct answer - stabilize in 7 days (recommended immediately)
- permanently or temporarily seed and mulch
- mulch/matting/straw
Minimum Standard 2 - ✔✔ correct 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 - ✔✔ correct 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
,Erosion and Sediment Control
this is the standard used to verify that a site is ready for release of bonds or surety
Minimum Standard 4 - ✔✔ correct 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 - ✔✔ correct 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 - ✔✔ correct 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 - ✔✔ correct 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
, Erosion and Sediment Control
Sediment Traps - ✔✔ correct 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 - ✔✔ correct 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 - ✔✔ correct 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]
Minimum Standard 7 - ✔✔ correct answer Cut and Fill Slopes
roughening the surface of the slope decreases runoff, lowers the velocity runoff, increases water
retention, and leads to better seed germination
slopes that are found to be eroding excessively within on year of permanent stabilization shall be
provided with additional slop stabilizing measures until the problem is corrected
Minimum Standard 8 - ✔✔ correct answer Concentrated Runoff
shall not flow down cut or fill slopes unless contained within an adequate temporary or permanent
channel, flume or slope drain structure
outlets of these drains need outlet protection to prevent erosion from the concentrated flow
