Inspection and Test Plan for Method Statement – Granular Sub-Base (GSB) Installation (Type 1 / Type 2 Unbound Mixtures)
AI-assisted inspection and test plan connected to a method statement, with PDF and Excel export.
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 systematically verify that GSB layers meet material, compaction, and geometric tolerances prior to overlying works.
Who uses this inspection and test plan
Contractor QA/QC and Site Teams, Independent Laboratories, and the Engineer/Employer’s Representative.
When this ITP is prepared and submitted
Applied for each lot/layer of GSB during and after placement until final acceptance.
Who receives or approves this ITP
Engineer/Employer’s Representative for approval and lot acceptance.
Inspection scope
Covers material delivery, formation approval, spreading, moisture conditioning, compaction, field density, surface regularity, cross-fall, thickness, and documentation.
Typical hold, witness, and review points
Formation approval (Hold), field density tests (Hold), thickness checks (Hold), surface/cross-fall survey (Witness), compaction operations (Witness).
Typical inspection records
Material certificates, delivery tickets, density/moisture reports, survey logs, straightedge records, roller pass logs, IR approvals, NCR/CAR (if any).
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 |
|---|---|---|---|---|
| Material delivery and certification | Check CoC/DoP; verify source and grading certificates | Material complies with BS EN 13285/13242 and approved submittal | QA/QC Engineer | Material approval; delivery tickets; certificates |
| Stockpile condition and segregation control | Check separation by type/lot; no contamination; drainage in place | No cross-contamination; minimal segregation; controlled height/slopes | Foreman / QA/QC | Stockpile inspection log |
| Formation approval / geotextile installation (if required) | Survey levels; proof-rolling; visual checks; geotextile overlaps | Firm, stable formation; levels within tolerance; geotextile overlapped ≥300 mm and secured | Site Engineer / Engineer (Witness) | IR approval; survey report; photos |
| Setting out and control | Instrument calibration; check control points | Calibrations valid; control within allowable closure | Surveyor / QA/QC | Calibration certs; setting-out sheets |
| Layer spreading (pre-compaction) | Loose thickness checks; segregation checks | Uniform loose thickness (typically 150–200 mm); no visible segregation | Foreman / Site Engineer | Daily diary; thickness logs |
| Moisture conditioning | Moisture content checks (meter/oven) | -2% to +1% of OMC at time of compaction [Verify] | QA/QC / Foreman | Moisture test reports |
| Compaction operations | Roller pass log; check for movement/pumping | No visible deformation/pumping; full coverage including edges | Foreman / QA/QC / Engineer (Witness) | Roller logs; photos |
| Field density and moisture testing | NDG (ASTM D6938) or Sand Cone (ASTM D1556); moisture test | ≥95% of MDD (BS EN 13286-2/ASTM D1557); moisture within specified range | Lab Technician / QA/QC | Field density/moisture reports |
| Surface level, regularity, and cross-fall survey | 3 m straightedge; total station/laser survey grid | Level ±10 mm; 3 m straightedge ≤10 mm; cross-fall within ±0.3% [Verify] | Site Engineer / Surveyor | Survey report; straightedge log |
| Thickness verification | Test pits/cores or level delta between formation and GSB | Average thickness ≥ design; local -10 mm/+15 mm [Verify] | QA/QC / Engineer (Witness) | Thickness report; photos |
| Final inspection and lot acceptance | Review all test results and as-built | All ITP items closed with acceptable results | QA/QC / Engineer | IR sign-off; lot acceptance certificate |
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
Related method statement
This Inspection and Test Plan is associated with the Method Statement – Granular Sub-Base (GSB) Installation (Type 1 / Type 2 Unbound Mixtures) 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 – Granular Sub-Base (GSB) Installation (Type 1 / Type 2 Unbound Mixtures) method statement →