Examples of BMP selection options for various construction site risk conditions Examples of BMP selection options for various construction site risk conditions

Examples of BMP selection options for various construction site risk conditions
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Functional activity	BMPs for lower risks	BMPs for moderate risks	BMPs for higher risks
Planning	One-step clearing, grading, and stabilization	Two-phase clearing and grading, and stabilization	Multiple phases for clearing, grading, road and utility installation, building construction, etc.
	No mark-offs for critical areas needed	Infiltrative soils (i.e., for septic drainfields, rain gardens) marked off limits to traffic	Infiltrative soils, tree preservation area(s), stream buffers marked off
	One stabilized site exit, comprised of rock pad	Length and width of rock pad extended to deal with exit traffic and mud conditions	Shaker rack or wheel washer used to ensure minimization of trackout
	No crossings needed, or use of existing stabilized bridge or channel crossing	Installation of temporary culvert or other stabilized stream crossing	Installation of permanent stream crossing, e.g., moving up installation of planned bridge, etc.
Drainage management	No upland flows to divert from active construction area	Diversion ditch or berm installed upslope to keep run-on off the site	Upslope run-on diversions installed; installation of stabilized channel to carry upland flows through site
	Sheet flow only; no concentrated flows	Small, flat ditches double-seeded and lined with straw erosion control blanket	Larger, steeper ditches triple-seeded and lined with turf reinforcement mat
	No sediment trap or pond needed; sediment barrier suffices	One or more sediment traps needed to remove soil from site runoff flows	Multiple sediment traps and sediment ponds needed; use of flocculants to help remove very small particles
Soil stabilization	No need for interim soil stabilization with one-step clearing / grading approach	All site areas are seeded after grading except for building pad and immediate area used for materials	Phased stabilization as project progresses; soil binders / blown straw used on bare areas idle > 14 days
	Grass seed and blown straw mulch or hydroseeding used to stabilize site	Erosion control blanket installed over grass seed, with heavier seeding rate on slopes	Same as previous, with native mix and turf reinforcement mat or sod installed on steepest slopes
Sediment traps	Fiber rolls / logs or Type C silt fence used for downslope perimeter control	Type B or Type C silt fence used for downslope perimeter control	Heavy duty silt fence used at multiple intervals on long slopes
	Rock bags or other simple dike used for storm drain inlets	Filter fabric insert used for storm drain inlet protection	Catch basin insert used for maximum removal of sediment and other pollutants
	Dust control not necessary due to short duration of project	Dust control addressed via water truck as needed	Polymers or other soil binders applied on construction roads as needed for dust control