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Soil Compaction & Proctor Testing Inspection Checklist
A field inspection checklist for engineered fill placement and compaction covering proctor reference values, in-place density testing, lift thickness, and moisture control.
ASTM D698ASTM D1557ASTM D6938IBC 2021 Sec. 1705.6ASTM D2487
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Reference Data & Requirements
- Is a laboratory proctor (maximum dry density/optimum moisture) available for each fill material? *
- Does the geotechnical report specify the required relative compaction and moisture range? *
- Is the fill material classified and approved as suitable? *
- Is special inspection of fill placement required and scheduled? *
Subgrade & Fill Placement
- Has the subgrade been proof-rolled and unsuitable material removed? *
- Is fill placed in lifts not exceeding the specified maximum thickness? *
- Is moisture conditioning (wetting/drying) performed to reach optimum? *
- Is appropriate compaction equipment used for the soil type? *
In-Place Density Testing
- Is in-place density tested at the required frequency per lift and area? *
- Is the nuclear gauge calibrated and standardized before testing? *
- Does relative compaction meet the specified minimum (e.g., 90-95%)? *
- Is in-place moisture content within the specified range of optimum? *
- Are failing areas reworked and retested to passing? *
Documentation
- Are test locations, elevations, and results logged with pass/fail? *
- Are nonconforming areas and corrective actions recorded? *
- Is a final compaction report signed by the geotechnical engineer? *
- Photo of test location and compaction operation
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