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Method Statement: Subgrade Preparation and Compaction for Highway Construction inspection and test plan example.

Inspection and Test Plan for Method Statement: Subgrade Preparation and Compaction for Highway Construction

AI-assisted inspection and test plan connected to a method statement, with PDF and Excel export.

Published 26 Jun 2026 Rev. 00 1 views
About this ITP: This ITP sets out inspections, tests, and hold points for highway subgrade preparation, including proof rolling, density/moisture verification, and level checks prior to sub-base.

More than a static template

Unlike a downloadable Word or PDF template, this ITP is an AI-assisted editable starting point directly connected to its method statement. Every inspection activity, hold point, and acceptance criterion is structured and ready to adapt to your project.

  • AI-assisted customization — Tailor inspection activities and acceptance criteria to your specific project scope.
  • Linked method statement — This ITP is connected to the corresponding method statement describing the work sequence.
  • Multiple export formats — Download as a formatted PDF or editable Excel spreadsheet.
  • Editable starting point, not a final document — Review and verify all content against your project specifications and standards before use.

What you can customize

When you save this ITP to your account, every inspection row becomes editable. You can add, remove, or modify:

  • Inspection activity — Description of what is being inspected.
  • Inspection type — Hold point (H), Witness point (W), Review (R), or Monitor (M).
  • Responsibility — Contractor, subcontractor, engineer, or client.
  • Frequency — How often the inspection occurs.
  • Acceptance criteria — Referenced standard or specification requirement.
  • Records — Forms, test reports, or checklists required as evidence.

Why this ITP is used

To ensure subgrade meets specified density, moisture, and level tolerances with documented evidence before sub-base placement.

Who uses this inspection and test plan

Used by the Contractor’s QA/QC team, Site Engineers, and witnessed by the Engineer/Employer’s Representative.

When this ITP is prepared and submitted

Applied throughout subgrade preparation from formation trimming through final acceptance and release to sub-base.

Who receives or approves this ITP

Engineer/Employer’s Representative for review, witnessing, and approval.

Inspection scope

Covers survey control, formation condition, moisture conditioning, proof rolling, density/moisture testing, and levels/evenness.

Typical hold, witness, and review points

Survey verification (Hold), proof rolling (Hold/Witness), in-situ density (Hold/Witness), final release to sub-base (Hold).

Typical inspection records

ITP checklists, field density/moisture reports, proof-rolling sheets, survey level grids, NCR/CAR, and release memos.

Important approval note

This ITP is an AI-assisted editable starting point, not a pre-approved document. Before use on any project, all inspection activities, hold points, and acceptance criteria must be reviewed and approved by the relevant parties (superintendent, principal contractor, or client representative) in accordance with your contract and project quality plan.

Always verify acceptance criteria against your applicable drawings, specifications, and regulatory requirements. Hold points must be confirmed with the relevant authority before work proceeds past that point.

Inspection and test plan

Activity Inspection / Test Acceptance Criteria Responsibility Record
Pre-start documentation Check approvals, Proctor curves, TMP, permits Approvals in place; current Proctor for soil types; permits active. QA/QC Engineer Pre-start checklist
Survey control verification (HOLD) TBM check, control traverse, instrument calibration Control within tolerances; instruments calibrated. Site Engineer/Surveyor; Engineer Rep (Witness) Survey verification report
Site clearing/stripping Visual inspection Formation free of organic/unsuitable material. Site Engineer Inspection record; photos
Formation trimming and shaping Level survey, crossfall check Levels ±20 mm; crossfall within ±0.5% [Verify]. Site Engineer/Surveyor Survey sheet
Moisture conditioning (pre-proof roll) Moisture tests OMC ±2% [Verify]. QA/QC Tech Moisture test reports
Proof rolling—pre-compaction (HOLD) Observation; measurement of rutting/deflection No pumping/cracking; rutting/deflection ≤25 mm; soft spots identified and logged. Site Engineer; Engineer Rep (Witness) Proof-rolling sheet
Soft spot remediation Visual, density/moisture as required Remediated zones meet criteria for density/levels/proof roll. Site Engineer Remediation log; test reports
Compaction process control Check roller settings, passes, speed Rolling pattern with 1/3 overlap; speed 3–5 km/h; no slippage/wave. Foreman/QA-QC Daily compaction log
In-situ density and moisture testing (HOLD) ASTM D1556/D6938; D2216/D4944 Traffic lanes ≥98% MDD; shoulders/medians ≥95% MDD; moisture OMC ±2% [Verify]. QA/QC Tech; Engineer Rep (Witness) Field density reports; correlation sheets
Level and evenness checks Total station/level; 3 m straightedge Levels ±20 mm; evenness ≤20 mm under 3 m; crossfall within ±0.5%. Surveyor/QA-QC Survey reports; straightedge checklist
Re-proof rolling after remedial works (if specified) Observation/DCP as needed Meets proof-roll criteria; no pumping/rutting >25 mm. Site Engineer Proof-roll sheet
Final acceptance and release to sub-base (HOLD) Review dossier: densities, moisture, levels, proof-rolling, NCR close-out All acceptance criteria met; lot signed-off; surface protected. QA/QC; Engineer Rep RFI/IR, release memo

This table is a read-only public reference. Download the PDF or Excel version, or customize this ITP to edit it for your project.

Frequently asked questions

Nuclear gauge results may be used for process control and acceptance if a project-approved correlation to sand cone is established and maintained.

By uniform soil type and work area (e.g., 200–500 m per lane). Each lot must meet minimum test frequencies and acceptance criteria.

It becomes a non-conformance area to be undercut and replaced or stabilized as directed, then re-tested and re-proof rolled before acceptance.

Related method statement

This Inspection and Test Plan is associated with the Method Statement: Subgrade Preparation and Compaction for Highway Construction method statement, which describes the step-by-step construction sequence, resources, materials, equipment, safety controls, and environmental controls for this activity.

View the Method Statement: Subgrade Preparation and Compaction for Highway Construction method statement →

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