Erosion and Sediment Control Prep Exam Questions And Actual Answers.
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Course
CESSWI
Institution
CESSWI
Minimum Standard 1 - 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 ...
Erosion and Sediment Control Prep
Exam Questions And Actual Answers.
Minimum Standard 1 - 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 - 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
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]
Minimum Standard 7 - 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
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