Erosion and Sediment Control exam questions with 100% correct answers

Erosion and Sediment Control exam questions with 100% correct answersMinimum 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 Page 2 of 30 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 Page 3 of 30 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 Page 4 of 30 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