CESSWI- 8 (BMPs) Questions and Answers 100% Verified

CESSWI- 8 (BMPs) Questions and Answers 100% Verified Existing vegetation -designed to stabilize soil and to remove suspended particles from sheet flow runoff Limitations= some regions may not have vegetation to work with Scheduling -involves creating a written plan to address necessary BMPs and sequencing of construction events -must take into account local considerations such as rainfall, wind, soil types -overall purpose is to minimize the amount and duration of exposed soil Tree protection -protecting trees so they don't have to be removed -delineate tree area with fencing or similar devices Hydromulch -consists of wood or other fiber in a hydraulic matrix with a stabilizing emulsion or tackifying agent Limitations= requires curing time, not meant for high-traffic areas Hydroseed -consists of seed, fertilizer, and stabilizing emulsion applied with hydraulic equipment to protect soils from wind and water Limitations= may be difficult on steeper slopes Mulching designed to reduce erosion and runoff by applying straw, wood, bark, or other mulching material to exposed soil Limitations= not suitable for steep slopes, undesirable species may be introduced to your site Rolled Erosion Control Products (RECP) -erosion control blankets (temp.) or turf reinforcement mats (permanent) that act as soil stabilization devices. Constructed of natural materials-straw, wood excelsior, or coconut husk. Seeding -brings about the establishment of temporary or permanent vegetative cover Sod -operates, by laying either in squares or rolls, a thick, lush vegetative cover on top of soil Limitations= time from harvest to installation should not exceed two to three days; DO NOT mow until the sod has had a chance to establish a local root system Soil Binders -applied to disturbed soils to reduce erosion (ex. polyacrylamides (PAM)) Surface Roughening -uses mechanized equipment to apply a rough texture to graded soils. This forces water to encounter multiple small "sediment traps" -horizontal depressions applied on the contour Tackifiers -adhesives that are used to secure mulch materials to a surface and to other mulch materials or to cause soil particles to stick to one another Temporary Stabilization -designed to reduce erosion by stabilizing areas that willl lay bare for extended periods (ex. stone and plastic) Baffles -designed to lengthen the flow path of basins/traps/ponds as well as slowing, calming, and distributing the flow in these devices, thus allowing pollutants more time to fall out of suspension Cut-back Curb -create a place for water to pond at the back of curb while still allowing full access to the site Fiber rolls/ Waffles -straw, mulch, etc. packed and placed into rolls that is designed to capture sediment and reduce flow velocity -targets sediment and hydrocarbons Sediment Bags Utilize large, porous sediment collection bags to manage pollutant discharge when accumulated water must be removed from job site Limitations= does not capture all sediment Sediment Basin -allows stormwater runoff to be collected and allows the sediment present in the runoff to fall out of suspension before the water is allowed to undergo controlled release Sediment Trap -provide an area for sediment laden runoff to pond, allowing the sediment to settle out of suspension before that runoff is discharged Sediment Tube Ditch Check -consist of compacted rolls of wood, etc. placed in channels, ditches, or swales to capture sediment and reduce flow velocity Silt Fence -consists of filter fabric stretched across stakes and entrenched -reinforced silt fence- filter fabric stretched across metal stakes, reinforced with gauge wire and entrenched -super silt fence- filter fabric stretched across steel posts, reinforced with large gauge wire (chain-link fence material), and entrenched Limitations= degraded by UV light, cannot be used in an area of concentrated flow, not for use on steep slopes Skimmers -designed to float and dewater a sediment basin or pond from the surface Stabilized entrance/exit -reduces tracking of sediment onto public rights-of-way by vehicles and equipment Straw Bales -operate by either routing flow, or creating a damming area around a specified area thereby preventing stormwater runoff from gaining access to certain portions of the construction site Temporary Stream Crossing -comprised of a culvert, ford, or bridge that spans a waterway to provide construction traffic stable access to sites Triangular Filter Fabric Dikes -constructed of wire mesh and geotextile filter fabric, or a foam core and geotextile filter fabric, and placed where sediment laden runoff from small drainage areas occurs to reduce runoff velocity and create ponding to allow sediment from construction areas to settle out Turbidity Curtain/Barrier -designed to reduce or eliminate debris, turbidity and sediment transport from a disturbed area adjacent to or within a body of water Diversions -utilized to intercept and divert run on/off site water and off site runoff to a stabilized outlet or treatment practice Gabions -utilizing wire baskets filled with stone to achieve structural purposes (building walls, etc.) Inlet Protection at Grade -protects inlets that are flush with the ground, or at grade which receives stormwater from disturbed ares or the construction site