Erosion and Sediment Control
questions well answered passed
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 - correct answer ✔✔ Minimum Standard 1
- stabilize in 14 days
- temporarily seed
- mulch
- permanently stabilize if dormant > 1 year - correct answer ✔✔ Site NOT at Final Grade
- stabilize in 7 days (recommended immediately)
- permanently or temporarily seed and mulch
- mulch/matting/straw - correct answer ✔✔ Site at Final Grade
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 - correct answer ✔✔ Minimum Standard 2
,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 - correct
answer ✔✔ Minimum Standard 3
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 - correct answer ✔✔ Minimum Standard 4
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 - correct answer ✔✔ Perimeter Controls
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 - correct answer ✔✔ Minimum Standard 5
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 - correct answer ✔✔ Minimum
Standard 6
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* - correct answer ✔✔ Sediment Traps
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. - correct answer ✔✔ Sediment
Basins
questions well answered passed
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 - correct answer ✔✔ Minimum Standard 1
- stabilize in 14 days
- temporarily seed
- mulch
- permanently stabilize if dormant > 1 year - correct answer ✔✔ Site NOT at Final Grade
- stabilize in 7 days (recommended immediately)
- permanently or temporarily seed and mulch
- mulch/matting/straw - correct answer ✔✔ Site at Final Grade
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 - correct answer ✔✔ Minimum Standard 2
,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 - correct
answer ✔✔ Minimum Standard 3
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 - correct answer ✔✔ Minimum Standard 4
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 - correct answer ✔✔ Perimeter Controls
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 - correct answer ✔✔ Minimum Standard 5
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 - correct answer ✔✔ Minimum
Standard 6
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* - correct answer ✔✔ Sediment Traps
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. - correct answer ✔✔ Sediment
Basins
