- Awards and Recognition
- Barrier Aesthetics
- Blue Star Memorial Highways
- Classified Landscaped Freeways
- Community Identification
- Context Sensitive Solutions
- Erosion Control Toolbox
- Gateway Monuments
- Main Streets
- Mission Bells
- New Product Review
- Policy and Procedures
- Roadside Toolbox
- Safety Roadside Rest Area System
- Scenic Highways
- Standards and Nonstandards
- Transportation Art
- Visual Impact Assessment Outlines
- Visual Impact Assessment Training
- Water Conservation
Erosion Control Toolbox
To Combine Specifications
Planning & Design
Improve Soil Health
- Soil Rehabilitation
- Local Topsoil
- Imported Topsoil
- Roughen Soil Surface
- Stepped Slopes
- Contour Grading and Slope Rounding
- Decompact Soil
- Incorporate Materials
Improve Soil Health & Provide Cover
Short Term Cover
Long Term Cover
Steep Slope Techniques
- Stepped Slope
- Cellular Confinement
- RECP Flap
- RECP Flap with Brush Layering
- RECP Wrap
- Soil Filled RSP
- Wire Blanket
- Wire Mesh Confinement
- Plant Selection
- TransPlant Application
- Noxious and Invasive Species
- Drill Seed
- Dry Seed
- Native Grass Sod
- Brush Layering
Low Impact Development
- Sidewalk Stormwater Planter
- Sidewalk Stormwater Tree Trench
- Parking Stormwater Planters
- Permeable Paving
- Additional Resources
What is This Treatment?
Imported topsoil is topsoil obtained from outside the project limits. Imported topsoil is typically used for highway planting projects rather than for erosion control work.
Where to Use This Treatment:
- Use to provide topsoil as a growth medium on slopes 1.5:1 (H:V) and flatter. To minimize slumping during heavy rain events, the following application rates are suggested where topsoil will not be secured by additional products such as cellular confinement or turf reinforcing mat:
- Slopes 1.5:1 (H:V) - 2" maximum thickness.
- Slopes 2:1 (H:V) - 3" maximum thickness.
- Slopes 3:1 (H:V) - 4" maximum thickness.
- Slopes ≤ 4:1 (H:V) - 6" maximum thickness.
- Typically used for Highway Planting projects. Consider using Local Topsoil for erosion control work.
- Reduced stormwater runoff volume and velocity.
Improved infiltration rate.
Improved soil water holding capacity.
Improved soil structural properties - soil structure, porosity, and texture.
Improved plant rooting depth.
Improved soil chemical properties - providing proper pH, carbon, nitrogen, potassium and phosphorus levels.
Improved soil nutrient levels and nutrient cycling.
Improved potential for vigorous long term vegetation coverage.
- More costly (yet more effective) than surficial treatments such as Erosion Control (Hydroseed).
Requires temporary storage space within the project limits to stockpile materials.
Requires site accessibility by earthwork equipment.
- 1” depth = 140 cubic yards/acre.
- 3” depth = 420 cubic yards/acre.
- 6" depth = 840 cubic yards/acre.
- 2010 Standard Specifications (See Section 21-1.02D and 21-1.03D Topsoil)
- 2010 Revised Standard Specifications (RSS)
Plans and Details:
- There is no Standard Plan required for Topsoil.
- Click here to view current awarded bid prices for Imported Topsoil.
- Use BEES code 200102 Imported Topsoil for payment by cubic yard.
- Use BEES code 200103 for Imported Topsoil for payment by ton.