Peer review and expert witness services provide an independent technical assessment of geotechnical work.
It ensures quality, identifying risk, and provides defensible opinions for legal proceedings.
Geotechnical Peer Review
A geotechnical peer review is an independent technical assessment of geotechnical investigations, analyses, designs, or reports conducted by a reviewer with equivalent or superior expertise to the original designer.
When Is Peer Review Required?
| Situation | Typical Trigger |
|---|---|
| High-risk projects | Deep excavations, unstable slopes, tailings dams |
| Regulatory requirement | Dam safety reviews (ANCOLD), mining regulations |
| Insurance requirement | Professional indemnity insurance conditions |
| Design certification | Independent design verification under NCC |
| Complex ground conditions | Karst, liquefiable soils, deep reactive clays |
| Third-party claims | Dispute resolution, litigation support |
Types of Peer Review
| Level | Scope | Effort |
|---|---|---|
| Level 1: Desktop review | Review of reports and design documents only | 1–5 days |
| Level 2: Technical review | Detailed review of analyses, assumptions, and conclusions | 5–15 days |
| Level 3: Comprehensive review | Full technical review including site visit, independent analysis, and recommendations | 15–40+ days |
Peer Review Checklist
A comprehensive geotechnical peer review typically covers:
- Scope and adequacy of investigation — were sufficient boreholes, tests, and analyses performed?
- Geological/ground model — is the interpreted ground model reasonable and justified?
- Design parameters — are the selected soil/rock parameters appropriate?
- Analysis methods — were appropriate methods used and correctly applied?
- Design outcomes — are the foundation, slope, or earthworks designs safe and economical?
- Construction considerations — are construction risks adequately addressed?
- Monitoring requirements — is a monitoring plan in place for critical elements?
- Reporting — is the report clear, complete, and compliant with standards?
Peer Review Report
The peer review report typically includes:
- Scope of review
- Documents reviewed
- Observations and findings
- Recommendations
- Risk assessment of unresolved issues
- Opinion on overall adequacy of the geotechnical work
Expert Witness Services
Expert witnesses provide independent, objective technical opinions in legal proceedings — including litigation, arbitration, mediation, and expert determination.
Role of the Expert Witness
The expert witness's duty is to the court or tribunal, not to the engaging party:
- Provide independent, objective opinions
- Address the technical issues within their expertise
- Clearly state the facts, assumptions, and reasoning underlying their opinions
- Identify areas where the evidence is incomplete or uncertain
- Consider alternative views fairly
Expert Witness Code of Conduct
In Australian courts and tribunals, expert witnesses must comply with the Expert Witness Code of Conduct (Schedule 7 of the Uniform Civil Procedure Rules):
- The expert's duty is to the court and overrides any obligation to the engaging party
- The expert must provide an independent opinion
- The expert must state the facts and assumptions on which their opinion is based
- The expert must make it clear if a matter is outside their expertise
- The expert must disclose any material changes of opinion
Types of Geotechnical Expert Witness Matters
| Matter Type | Common Issues |
|---|---|
| Construction disputes | Differing site conditions claims, foundation failures, earthworks defects |
| Professional negligence | Inadequate investigation, incorrect interpretation, design errors |
| Property damage | Landslip damage, tree root/footing interaction, reactive soil movement |
| Contractual disputes | Ground conditions versus contract documents, delays from unexpected ground |
| Insurance claims | Foundation damage assessment, causation analysis |
| Planning appeals | Geotechnical constraints on development |
| Personal injury | Excavation collapse, trench failure, retaining wall failure |
Expert Witness Report Structure
- Qualifications and experience
- Instructions and scope
- Documents reviewed
- Site inspection observations (if applicable)
- Technical analysis and findings
- Opinions and conclusions
- Statement of compliance with Expert Witness Code of Conduct
- Appendices — test results, photographs, calculations
Key Competencies
Peer Reviewer Requirements
- At least 15–20 years of geotechnical engineering experience
- Chartered Professional Engineer (CPEng) or equivalent
- Registered Professional Engineer (RPEng) in relevant state
- Specific expertise in the subject matter
- No involvement in the original project
Expert Witness Requirements
- All of the above, plus
- Experience in expert determination or litigation
- Understanding of legal processes and cross-examination
- Ability to communicate complex technical issues clearly
- Demonstrated independence and impartiality
Australian Standards
| Standard / Body | Relevance |
|---|---|
| AS 1726-2017 | Geotechnical site investigations — review of compliance |
| AS 1170.0 | Structural design actions — design review |
| Engineers Australia | Code of Ethics, Guidelines for Expert Witnesses |
| Uniform Civil Procedure Rules | Expert Witness Code of Conduct |
| ANCOLD | Dam design review requirements |
| IEAust | Guidelines for Engineering Investigations |
Frequently Asked Questions
What is the difference between peer review and QA review?
Peer review focuses on the technical adequacy and reasonableness of the geotechnical work. QA review typically focuses on procedural compliance (checking that required processes were followed).
How do I select a peer reviewer?
Look for someone with:
- Relevant technical expertise (same ground conditions, same project type)
- Minimum 15 years of experience
- CPEng or equivalent registration
- No conflict of interest
- Availability within the project timeframe
Can the same person be peer reviewer and expert witness?
Yes, but the roles are different. Peer review is a technical quality assurance role conducted during the project. Expert witness is a legal role that may arise after a dispute. The same person could serve in both roles, but should clarify which role they are acting in.
What makes a good geotechnical expert witness?
- Deep technical knowledge
- Clear written and verbal communication
- Demonstrated independence
- Ability to withstand cross-examination
- Experience giving evidence in the relevant jurisdiction