Structural BMPs Exam Questions And
Answers Latest 2025
Construction Exit (Co) -
correct answer ✅To reduce or eliminate the transport of mud
from construction area.
Co -
correct answer ✅Aggregate size - R-2 (1.5 to 3.5 inch stone)
Pad thickness -min. 6 inches
Pad width - min. 20 feet, but must equal full width of all points of
vehicular egress
Pad length - min. 50 feet
Washing - Wash tires if gravel does not remove sediment. Divert
tire washing to proper area
Sediment Barrier (Sd1)
Prevent sediment carried by sheet flow from leaving the site -
correct answer ✅Temporary structures
Typically silt fence supported by steel or wood posts.
Other: sandbags, straw bales, brush piles, filtersocks or other
filtering material.
,Structural BMPs Exam Questions And
Answers Latest 2025
Silt Fence Sd1 -
correct answer ✅DO NOT install across streams, ditches,
waterways or concentrated flows
Remove structure and sediment upon permanent stabilization
Type A - 36" wide sheet flow only
Type B - 22" wide sheet flow only
Type C - 36" wide high flows, slopes > 10 feet
Type A silt fence Sd1-A -
correct answer ✅Type A silt fence uses wooden posts that are
spaced a maximum of six feet apart.
Type B silt fence Sd1-B -
correct answer ✅Similar to Type A, but for minor projects,
residential scale
Type C silt fence Sd1-C -
correct answer ✅For stream buffers and other sensitive areas, two
rows of Type C silt fence or one row of Type C Silt Fence backed by
hay bales shall be used
, Structural BMPs Exam Questions And
Answers Latest 2025
Straw Bale Sd1-Hb -
correct answer ✅Only use for projects < 3 Months in length
Mulch Berms -
correct answer ✅Mulch berms are excellent for perimeter control
and for reducing the turbidity in sediment laden water in sheet
flow. Instead of burning or hauling wood waste to a landfill, mulch
it onsite and build berms for sediment control.
Sd3 Temporary Sediment Basin -
correct answer ✅A basin created by excavation or the construction
of a barrier or dam across a concentrated flow area
Consists of a dam, pipe outlet, and an emergency spillway
To detain runoff waters and trap sediment from erodible areas to
protect properties and drainage ways
Silt fence -
correct answer ✅cannot be used to account for the required 67
cubic yards per acre sediment storage.
Sd3
Size according to location, size of drainage area, soil type,
Answers Latest 2025
Construction Exit (Co) -
correct answer ✅To reduce or eliminate the transport of mud
from construction area.
Co -
correct answer ✅Aggregate size - R-2 (1.5 to 3.5 inch stone)
Pad thickness -min. 6 inches
Pad width - min. 20 feet, but must equal full width of all points of
vehicular egress
Pad length - min. 50 feet
Washing - Wash tires if gravel does not remove sediment. Divert
tire washing to proper area
Sediment Barrier (Sd1)
Prevent sediment carried by sheet flow from leaving the site -
correct answer ✅Temporary structures
Typically silt fence supported by steel or wood posts.
Other: sandbags, straw bales, brush piles, filtersocks or other
filtering material.
,Structural BMPs Exam Questions And
Answers Latest 2025
Silt Fence Sd1 -
correct answer ✅DO NOT install across streams, ditches,
waterways or concentrated flows
Remove structure and sediment upon permanent stabilization
Type A - 36" wide sheet flow only
Type B - 22" wide sheet flow only
Type C - 36" wide high flows, slopes > 10 feet
Type A silt fence Sd1-A -
correct answer ✅Type A silt fence uses wooden posts that are
spaced a maximum of six feet apart.
Type B silt fence Sd1-B -
correct answer ✅Similar to Type A, but for minor projects,
residential scale
Type C silt fence Sd1-C -
correct answer ✅For stream buffers and other sensitive areas, two
rows of Type C silt fence or one row of Type C Silt Fence backed by
hay bales shall be used
, Structural BMPs Exam Questions And
Answers Latest 2025
Straw Bale Sd1-Hb -
correct answer ✅Only use for projects < 3 Months in length
Mulch Berms -
correct answer ✅Mulch berms are excellent for perimeter control
and for reducing the turbidity in sediment laden water in sheet
flow. Instead of burning or hauling wood waste to a landfill, mulch
it onsite and build berms for sediment control.
Sd3 Temporary Sediment Basin -
correct answer ✅A basin created by excavation or the construction
of a barrier or dam across a concentrated flow area
Consists of a dam, pipe outlet, and an emergency spillway
To detain runoff waters and trap sediment from erodible areas to
protect properties and drainage ways
Silt fence -
correct answer ✅cannot be used to account for the required 67
cubic yards per acre sediment storage.
Sd3
Size according to location, size of drainage area, soil type,
