Class Exercise Soil Stabilization

Class Exercise

• Soil Stabilization

• Sediment Controls

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

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

Soil Stabilization Calculations

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

Soil Stabilization Calculations

• Calculate the total DSA that will require soil stabilization

Sediment Control Calculations

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

Linear Barrier Calculations

• Calculate total length of Linear barrier needed

Slope Length

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

Slope Length

• Spacing of Fiber Rolls

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

Slope Length Calculations

• Pythagorean Theorem

• A2 + B2 = C2
• A=42
• B=14

Soil Stabilization Calculations

• Calculate the total DSA that will require fiber rolls

Class Exercise

• Break in to groups of 4 to 5 people

• Handouts:

• Plan sheet
• Tables

• Calculate SS and SC materials

Erosion and Sediment Control Labor Estimates

• Soil Stabilization*

• Hydroseeding
• 150,000 ft2 a day (flat turf)
• 22 bales @ 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 @ 2 tons per acre