Sub-base Preparation Checklist
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Site Clearance & Excavation
Ensuring the site is clear of obstructions and excavated to the correct level for sub-base installation.
Existing Site Conditions Description
Excavation Depth (meters)
Excavation Depth Variance Allowed (meters)
Obstructions Removed (Select all that apply)
Details of Utility Location and Protection (if applicable)
Site Clearance Photos (Before)
Topsoil Stripping & Stockpiling - Method
Grading & Leveling
Establishing the correct slope and level of the excavated area prior to sub-base placement.
Design Grade Elevation (m)
Existing Ground Level (m) - Average
Cut/Fill Depth (m) - Maximum
Leveling Method Used
Description of Leveling Procedure & Challenges Encountered
Grade Variance (m) - Maximum Acceptable
Surface Finish Required
GPS Coordinates of Leveling Points (Representative)
Geotextile Installation (if applicable)
Proper installation of geotextile fabric for separation and filtration purposes.
Geotextile Type Specified?
Geotextile Material Specification (e.g., Manufacturer, Grade)
Geotextile Overlap Width (meters)
Overlap Orientation (as per specification)
Installation Method Used (e.g., Unrolled, Laid)
Check for Damage/Defects
Upload Photograph of Geotextile Installation
Area of Geotextile Installed (m²)
Sub-base Material Delivery & Storage
Confirmation of correct material type, quantity, and proper on-site storage to prevent contamination.
Material Type Confirmation
Specify Material Type (if 'Other')
Delivery Quantity (in tons/cubic meters)
Delivery Ticket/Receipt
Material Condition Upon Delivery
Notes on Material Condition
Storage Location
Storage Protection Measures
Sub-base Material Placement
Ensuring consistent material thickness and compaction during placement.
Sub-base Layer Thickness (inches)
Area of Sub-base Installation (sq ft)
Material Type Verification
Notes on Material Placement (e.g., specific issues, adjustments made)
Material Spread Consistency
Photo Evidence of Material Placement
Material Volume Placed (cu yd)
Date of Material Placement
Sub-base Compaction
Achieving the required compaction levels according to project specifications.
Initial Compaction Test Result (Density)
Target Compaction Density (%)
Number of Passes with Compaction Equipment
Compaction Equipment Type
Notes on Compaction Process (e.g., moisture control, problem areas)
Moisture Content (%) at Time of Compaction
Did compaction achieve target density?
Attach Compaction Test Reports
Compaction Supervisor Signature
Quality Control & Testing
Performing necessary tests to verify material properties and compaction levels.
Moisture Content (%)
Compaction Test Result (density ratio)
Particle Size Distribution - % Passing 75µm (Sieve)
Material Type Verified?
Grading Certificate Received?
Testing Date
Comments/Observations
Attach Test Report (PDF)
Final Inspection & Sign-off
Verifying all requirements are met and obtaining sign-off for sub-base preparation.
Final Compaction Test Results (Proctor)
Final Level Variation (Maximum allowed)
Material Type Verified as per Specification?
Any Observed Issues or Deviations?
Inspection Date
Inspection Time
Inspector Signature
Sub-base preparation meets project requirements?
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