EROSION AND SEDIMENT CONTROL
EXAM QUESTIONS AND ANSWERS
Soil Erosiom - ANSWER-The process of detatchment and transport of sediment
particles caused by wind, rain, ice, and gravity. Erosion rates directly correspond to the
percentage of bare soil on a site.
Sedimentation - ANSWER-The deposition of soil particles
Potential Problems Arising From Construction Related Activities - ANSWER-
Degradation to downstream properties and waterways. Damage to new and existing
infrastructure. Nuisances: dust and mud tracked onto public streets
E&SC Plan - ANSWER-Used to show the location and size of the various ESC
practices. Phase 1 = Initial clearing and grading. Phase 2 = Finish grading and
protection of site infrastructure.
E&SC Narrative - ANSWER-Provides supporting calculations. Includes information
often redundant to Feasibility Report: vicinity map, neighboring properties, soil types,
critical areas of concern.
Factors Influencing Soil Erosion - ANSWER-Rainfall frequency and distribution type; soil
properties (permeability/cohesiveness); topography; vegetation (ie surface cover)
Level Spreader - ANSWER-VESCH 3.21. Size based on 10 year return frequency.
Diversion channel leading to spreader should have a 20 foot transition section. Level
spreader section on 0% grade.
Seeding - ANSWER-Temporary: 3.31; used on areas that will not be brought to final
grade within 30 days. Permanent: 3.32; used on areas that are at final grade. Used on
areas that are rough graded and will not be fine graded for a period of greater than one
year.
Sediment trap - ANSWER-3.13. Maximum drainage area of 3 ac. Initial storage volume
of 134 cy/ac. 67 cy wet, permanent storage. 67 cy dry, drawdown storage. Maximum
effective life of 18 months.
Silt Fence - ANSWER-Proper installation requires that the fence be "keyed" into the soil.
Maximum drainage area of 0.25 ac/ 100 ft of fence. Maximum slope of 100 ft behind
fence. VESCH Std. & Spec 3.05. Minor swales where D.A < 1 ac and Q< 1cfs.
EXAM QUESTIONS AND ANSWERS
Soil Erosiom - ANSWER-The process of detatchment and transport of sediment
particles caused by wind, rain, ice, and gravity. Erosion rates directly correspond to the
percentage of bare soil on a site.
Sedimentation - ANSWER-The deposition of soil particles
Potential Problems Arising From Construction Related Activities - ANSWER-
Degradation to downstream properties and waterways. Damage to new and existing
infrastructure. Nuisances: dust and mud tracked onto public streets
E&SC Plan - ANSWER-Used to show the location and size of the various ESC
practices. Phase 1 = Initial clearing and grading. Phase 2 = Finish grading and
protection of site infrastructure.
E&SC Narrative - ANSWER-Provides supporting calculations. Includes information
often redundant to Feasibility Report: vicinity map, neighboring properties, soil types,
critical areas of concern.
Factors Influencing Soil Erosion - ANSWER-Rainfall frequency and distribution type; soil
properties (permeability/cohesiveness); topography; vegetation (ie surface cover)
Level Spreader - ANSWER-VESCH 3.21. Size based on 10 year return frequency.
Diversion channel leading to spreader should have a 20 foot transition section. Level
spreader section on 0% grade.
Seeding - ANSWER-Temporary: 3.31; used on areas that will not be brought to final
grade within 30 days. Permanent: 3.32; used on areas that are at final grade. Used on
areas that are rough graded and will not be fine graded for a period of greater than one
year.
Sediment trap - ANSWER-3.13. Maximum drainage area of 3 ac. Initial storage volume
of 134 cy/ac. 67 cy wet, permanent storage. 67 cy dry, drawdown storage. Maximum
effective life of 18 months.
Silt Fence - ANSWER-Proper installation requires that the fence be "keyed" into the soil.
Maximum drainage area of 0.25 ac/ 100 ft of fence. Maximum slope of 100 ft behind
fence. VESCH Std. & Spec 3.05. Minor swales where D.A < 1 ac and Q< 1cfs.
