Erosion And Sediment Control Questions And Correct Answers

EROSION AND SEDIMENT CONTROL
QUESTIONS AND CORRECT
ANSWERS



Minimum Standard 1 - ans-Stabilization
ws ws ws ws




permanent or temporary soil stabilization shall be applied to denuded areas within s
ws ws ws ws ws ws ws ws ws ws ws ws


even days after final grade is reached on any portion of the site; temporary soil stab
ws ws ws ws ws ws ws ws ws ws ws ws ws ws ws


ilization shall be applied within seven days to denuded areas that may not be at fina
ws ws ws ws ws ws ws ws ws ws ws ws ws ws ws


l grade but will remain dormant for longer than 14 days; permanent stabilization shal
ws ws ws ws ws ws ws ws ws ws ws ws ws


l be applied to areas that are to be left dormant for more than one year
ws ws ws ws ws ws ws ws ws ws ws ws ws ws ws




Site NOT at Final Grade - ans-- stabilize in 14 days
ws ws ws ws ws ws ws ws ws ws


- temporarily seed
ws ws


- mulch
ws


- permanently stabilize if dormant > 1 year
ws ws ws ws ws ws ws




Site at Final Grade - ans-- stabilize in 7 days (recommended immediately)
ws ws ws ws ws ws ws ws ws ws ws


- permanently or temporarily seed and mulch
ws ws ws ws ws ws


- mulch/matting/straw
ws




Minimum Standard 2 - ans-Stock Piles, Waste and Borrow Areas
ws ws ws ws ws ws ws ws ws




during construction, soil stock piles and borrow areas shall be stabilized or protected
ws ws ws ws ws ws ws ws ws ws ws ws


with sediment trapping measures
ws ws ws ws




mulch prevents erosion by protecting the surface from raindrop impact and silt fence
ws ws ws ws ws ws ws ws ws ws ws ws w


intercepts and detains from disturbed areas
s ws ws ws ws ws




Minimum Standard 3 - ans-Permanent Vegetation
ws ws ws ws ws




permanent vegetation cover shall be established on denuded areas not otherwise pe
ws ws ws ws ws ws ws ws ws ws ws


rmanently stabilized (permanent vegetation shall not be considered established until
ws ws ws ws ws ws ws ws ws ws


a ground cover is achieved that is uniform, mature enough to survive, and will inhibit
ws ws ws ws ws ws ws ws ws ws ws ws ws ws


erosion *there is no % associated with this*)
ws ws ws ws ws ws ws ws ws

,reduce erosion and decrease sediment yield from disturbed area
ws ws ws ws ws ws ws ws




this is the standard used to verify that a site is ready for release of bonds or surety
ws ws ws ws ws ws ws ws ws ws ws ws ws ws ws ws ws




Minimum Standard 4 - ans-First-Step Measures
ws ws ws ws ws




Sediment basins and traps, perimeter dikes, sediment barriers and other measures i
ws ws ws ws ws ws ws ws ws ws ws


ntended to trap sediment shall be constructed as a first step in any land-
ws ws ws ws ws ws ws ws ws ws ws ws ws


disturbing activity and shall be made functional before upslope land disturbance take
ws ws ws ws ws ws ws ws ws ws ws


s place
ws




a certain amount of initial land disturbance may be required to provide access for eq
ws ws ws ws ws ws ws ws ws ws ws ws ws ws


uipment to install the perimeter controls, but site clearing and grading should be kep
ws ws ws ws ws ws ws ws ws ws ws ws ws


t to a minimum until the perimeter controls are in place
ws ws ws ws ws ws ws ws ws ws




intercepts and detains small amounts of sediment from disturbed areas during constr
ws ws ws ws ws ws ws ws ws ws ws


uction operation to prevent sediment from leaving the site and decrease velocity of s
ws ws ws ws ws ws ws ws ws ws ws ws ws


heet flows and low-to-moderate level channel flow
ws ws ws ws ws ws




Perimeter Controls - ans- ws ws ws


assures that sediment does not leave the perimeter of the land-
ws ws ws ws ws ws ws ws ws ws


disturbing area once site clearing, grading, and construction commences
ws ws ws ws ws ws ws ws




Examples: silt fences, sediment traps, sediment basins, construction entrance, tempo
ws ws ws ws ws ws ws ws ws


rary diversions, diversions
ws ws




Minimum Standard 5 - ans-Earthen Structure Stabilization
ws ws ws ws ws ws




stabilization measures shall be applied to earthen structures such as dams, dikes, a
ws ws ws ws ws ws ws ws ws ws ws ws


nd diversions immediately after installation
ws ws ws ws




reduce erosion and sedimentation and reduce damage from sediment and runoff to
ws ws ws ws ws ws ws ws ws ws ws ws


downstream or off-site areas ws ws ws




Minimum Standard 6 - ans-Traps and Basins
ws ws ws ws ws ws




sediment traps and basins shall be designed and constructed based upon the total
ws ws ws ws ws ws ws ws ws ws ws ws ws


drainage area (not just disturbed area) to be served by the trap or basin
ws ws ws ws ws ws ws ws ws ws ws ws ws




Sediment Traps - ans- ws ws ws


minimum storage capacity shall be 134 cubic yards per acre of drainage area and s
ws ws ws ws ws ws ws ws ws ws ws ws ws ws


hall only control drainage areas less than 3 acres
ws ws ws ws ws ws ws ws




*stone outlet = trap* ws ws ws

, Sediment Basins - ans- ws ws ws


surface runoff from disturbed areas that is comprised of flow from drainage areas gr
ws ws ws ws ws ws ws ws ws ws ws ws ws


eater than or equal to 3 acres shall be controlled by a basin; minimum storage capa
ws ws ws ws ws ws ws ws ws ws ws ws ws ws ws


city of a sediment basin shall be 134 cubic yards per acre of drainage area; the outf
ws ws ws ws ws ws ws ws ws ws ws ws ws ws ws ws


all system shall, at a minimum, maintain the structural integrity of the basin during a
ws ws ws ws ws ws ws ws ws ws ws ws ws ws w


s25-year storm of 24- ws ws ws


hour duration; runoff coefficients used in runoff calculations shall correspond to a bar
ws ws ws ws ws ws ws ws ws ws ws ws


e earth condition or those conditions expected to exist while the sediment basin is u
ws ws ws ws ws ws ws ws ws ws ws ws ws ws


tilized.

Sediment Trapping Devises - ans- ws ws ws ws


1. place near the lowest drainage points of a project
ws ws ws ws ws ws ws ws ws




2. install as a first-step measure [MS-4]
ws ws ws ws ws ws




3. stabilize immediately [MS-5]
ws ws ws




4. must include outlet protection for basins [MS-11]
ws ws ws ws ws ws ws




Minimum Standard 7 - ans-Cut and Fill Slopes
ws ws ws ws ws ws ws




roughening the surface of the slope decreases runoff, lowers the velocity runoff, incr
ws ws ws ws ws ws ws ws ws ws ws ws


eases water retention, and leads to better seed germination
ws ws ws ws ws ws ws ws




slopes that are found to be eroding excessively within on year of permanent stabiliz
ws ws ws ws ws ws ws ws ws ws ws ws ws


ation shall be provided with additional slop stabilizing measures until the problem is
ws ws ws ws ws ws ws ws ws ws ws ws ws


corrected

Minimum Standard 8 - ans-Concentrated Runoff
ws ws ws ws ws




shall not flow down cut or fill slopes unless contained within an adequate temporary
ws ws ws ws ws ws ws ws ws ws ws ws ws ws


or permanent channel, flume or slope drain structure
ws ws ws ws ws ws ws




outlets of these drains need outlet protection to prevent erosion from the concentrate
ws ws ws ws ws ws ws ws ws ws ws ws


d flow
ws




size of pipe depends on drainage area
ws ws ws ws ws ws




temporarily conduct concentrated stormwater runoff safely down the face of a cut or
ws ws ws ws ws ws ws ws ws ws ws ws ws


fill slope without causing erosion on or below the slope
ws ws ws ws ws ws ws ws ws




Minimum Standard 9 - ans-Water Seeps ws ws ws ws ws




whenever water seeps from a slope face, adequate drainage or other protection shal
ws ws ws ws ws ws ws ws ws ws ws ws


l be provided
ws ws