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 –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 and Sediment Controls Calculations Soil Stabilization and Sediment Controls Calculations

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 Rise Run Slope = 142 m 156 m = 14 m 42 m = 42 Rise Run V:3H V H

10 Slope Length Calculations  Pythagorean Theorem A 2 + B 2 = C 2 A=42B=14 A B C = C = C = C = C

11 Soil Stabilization Calculations  Calculate the total DSA that will require fiber rolls Fiber Rolls

12 Class Exercise  Break in to groups of 4 to 5 people  Handouts: –Plan sheet –Tables  Calculate SS and SC materials

13  Soil Stabilization* –Hydroseeding  150,000 ft 2 a day (flat turf)  22 50lb a bale in a 3000 gal truck –Hydro Mulch (BFM)  12,000 ft 2 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 ft 2 tons per acre 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 *Estimates are based on vendor quotes actual installation time will vary based on site location, Slope steepness, and accessibility.