Subgrade Preparation — Design
Define the finished purpose, reference levels, underlying material condition and the evidence required by the receiving operation. Geometry alone does not establish structural or agronomic performance.
This reference assembles relevant extracts from the guide library. It is general project planning, not a local project report, verified specification or translated technical publication.
Subgrade Preparation
Subgrade preparation creates the surface that supports the next pavement or structural layer. The visible level and the condition of the material both matter.
Before moving material
Remove unsuitable material according to the project instructions and establish the formation reference.
Receiving operation and checks
Prepare for the specified compaction and acceptance process. Check levels, moisture and soft areas before the next layer is placed.
A geometric check cannot replace material testing.
Read the complete Subgrade Preparation guideDesign to Dirt
A drawing becomes useful in the field when its levels, coordinates and version are understood by the people and equipment doing the work. A design may be correct while the machine follows the wrong datum or an outdated file. Resolve that transfer before soil moves.
Before moving material
Agree the coordinate system, vertical datum, benchmark and drawing revision.
Receiving operation and checks
Record changes and return the verified surface information to the designer. Retain the issued design and the as-built check as separate records.
Do not infer a surveyed boundary or certified design from an illustrative terrain model.
Read the complete Design to Dirt guideUneven Subgrade
Uneven subgrade can create variable thickness in every layer above it. Correcting the surface is useful only if the underlying support is acceptable.
Before moving material
Identify soft areas and compare formation levels with design.
Receiving operation and checks
Complete compaction and specified acceptance checks. Check levels before base material conceals the subgrade.
A scraper does not replace proof testing or project-specific investigation.
Read the complete Uneven Subgrade guideRecord the job inputs
Use this checklist to turn the scenario into a specific brief. Retain the design revision and agree who accepts each completed layer.
Checklist ticks apply only while this page is open. Include the completed brief in your project records.
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