Class Exercise

1
Class Exercise

• Soil Stabilization
• Sediment Controls
• Verify the contractors calculations for the
  quantity of material need to stabilize a
  Disturbed Soil Area (DSA)

2
Soil Stabilization and Sediment Controls
Calculations

• Soil stabilization
• Estimating the amount of soil stabilization
  material need to protect disturbed soil areas
• Sediment control
• Estimating the amount of sediment control
  material need to protect disturbed soil areas
• Breaking up slope length
• Estimating the amount of fiber rolls or gravel
  bag berms needed to break-up slope lengths

3
Soil Stabilization Calculations

• Use Table 2-2 to determine which slopes require
  stabilization

4
Soil Stabilization Calculations

• Calculate the total DSA that will require soil
  stabilization

Disturbed Soil Area
5
Sediment Control Calculations

• Use Table 2-2 to determine which slopes require
  linear barriers

6
Linear Barrier Calculations

• Calculate total length of Linear barrier needed

Linear Barrier
7
Slope Length

• Use Table 2-2 to determine what slopes require
  breaking up the length

8
Slope Length

• Spacing of Fiber Rolls

9
Slope Steepness

• Calculating Slope Steepness
• Rise Over Run
• Slope steepness can be expressed by comparing the
  slopes horizontal component to the vertical
  component 1V 2H

1V3H
Rise Run
Slope
Rise
14 m
V
H
42
Run
10
Slope Length Calculations

• Pythagorean Theorem
• A2 B2 C2
• A42
• B14

C
B
A
11
Soil Stabilization Calculations

• Calculate the total DSA that will require fiber
  rolls

12
Class Exercise

• Break in to groups of 4 to 5 people
• Handouts
• Plan sheet
• Tables
• Calculate SS and SC materials

13
Erosion and Sediment Control Labor Estimates

• Sediment Controls
• Silt Fence
• 4 men and 5 labors
• 1000 linear ft a day
• Fiber Rolls
• 4 men and 5 labors
• 1500 linear ft a day

• Soil Stabilization
• Hydroseeding
• 150,000 ft2 a day (flat turf)
• 22 bales _at_ 50lb a bale in a 3000 gal truck
• Hydro Mulch (BFM)
• 12,000 ft2 per 3000 gal truck
• 5 loads per day
• Straw Mulch
• .4 Hectare an hour
• 1 to 2 bales a min
• 74 lb bale covers 800 ft2 _at_ 2 tons per acre

Estimates are based on vendor quotes actual
installation time will vary based on site
location, Slope steepness, and accessibility.