Who is competent to write a contaminated land report
Councils check the author of a contaminated land report before they check its conclusions. Here are the registers that matter, the liabilities involved and a review checklist.
Contaminated land reports are one of the few planning documents where the author's competence is itself a condition of acceptance. National policy places responsibility for securing a safe development on the developer, and local planning authorities expect investigation and assessment carried out in accordance with the relevant British Standards by suitably qualified and experienced persons. A Phase 1 or Phase 2 land contamination report legally requires that competent professional, and an AI-assisted draft is a starting point for them rather than a substitute for the investigation.
The practical consequence for a developer is that a report from an unrecognised author gets sent for third party review, at your cost and on your programme.
What suitably qualified and experienced means
There is no single statutory definition, and that is why the phrase causes trouble. What exists is a set of expectations drawn from guidance and standards.
The Environment Agency's land contamination risk management guidance sets out the staged process, from preliminary risk assessment through site investigation and options appraisal to remediation and verification, and expects each stage to be carried out by someone competent to do it. The British Standard on investigating potentially contaminated sites carries the same expectation, and adds that the report should record who did the work and on what basis.
Competence in this field is a combination of three things: a relevant scientific or engineering discipline, direct experience of comparable sites and contaminants, and familiarity with the regulatory framework the council and the Environment Agency apply. Someone strong on the first and weak on the third produces a technically sound report that does not answer the planning question.
Registers and chartered routes in the field
| Route | What it indicates |
|---|---|
| Specialist in Land Condition register | Assessed competence across the land condition disciplines |
| Suitably Qualified Person declaration under the national quality mark scheme | The report has been signed off by an assessed individual against a defined checklist |
| Chartered Geologist | Chartered status in geology through the professional body |
| Chartered Scientist, Chartered Environmentalist or Chartered Engineer | Chartered status in the relevant discipline |
The quality mark declaration is the one that changes how a council treats a report. Where a scheme carries it, some authorities reduce or remove the third party review they would otherwise commission, because the checking has already been done to a published standard.
None of these is a legal requirement. All of them shorten the discharge of conditions.
How councils check the author on discharge
Contaminated land conditions are usually staged: a preliminary risk assessment before submission or before work starts, an intrusive investigation and remediation strategy, then a verification report before occupation.
At each stage the council's contaminated land officer, or its environmental health team, reads the report and looks at four things:
- Who wrote it, and what their stated qualifications and experience are.
- Whether the conceptual site model has been updated to reflect what was actually found.
- Whether the sampling rationale matches the identified sources and pathways.
- Whether the generic assessment criteria used are named, current and appropriate to the end use.
A report that fails on the fourth point is common and easily avoided. Assessment criteria are revised, and using a superseded value for a residential end use is the kind of error that produces a request for a full reassessment.
Where the authority has no in-house specialist, it commissions an external reviewer and recharges the cost. Budget for it on any site with a former industrial use.
Liability and professional indemnity
Two liabilities run in parallel and they are frequently confused.
The statutory contaminated land regime under Part IIA of the Environmental Protection Act 1990 identifies who is responsible for remediating land determined as contaminated. That regime sits behind the planning system rather than inside it, and planning conditions are the usual route by which contamination is dealt with on a redevelopment.
The consultant's liability is contractual and in negligence, backed by professional indemnity insurance. Check the level of cover against the value of the risk rather than against the fee. A £5,000 desk study on a site where the remediation strategy will cost £400,000 carries an exposure that has nothing to do with the fee.
Where a funder or a purchaser is involved, collateral warranties or a reliance letter will be required, and consultants price them separately. Ask at appointment rather than at completion.
Coordinating with the geotechnical scope
Ground investigation is expensive to mobilise and comparatively low cost to extend, so combine the geoenvironmental and geotechnical scopes in one campaign wherever the programme allows.
The two disciplines want different things from the same holes. Geotechnical work follows the site investigation standards and the Eurocode approach, targeting foundation design, and it wants undisturbed samples and in situ testing at depth. Geoenvironmental work targets the source, pathway and receptor model, and it wants shallow samples where made ground and contamination sit, plus gas and groundwater monitoring installations.
Write one specification covering both, and make sure the Geotechnical Assessment and the contaminated land assessment share the same borehole log set. Two reports describing different ground profiles on the same site is an avoidable problem.
Ground gas monitoring deserves separate planning. It needs multiple visits over a period, and the visits have to include falling and low atmospheric pressure conditions to be representative. That is weeks, not days, and it sits on the critical path more often than anything else in the investigation.
Reviewing a report before it goes in
- Read the conceptual site model first. If it has not changed between Phase 1 and Phase 2, ask why.
- Check that every source identified in the desk study has been investigated or explicitly discounted with reasons.
- Check the sampling density and depths against the areas of concern shown on the plan.
- Check the assessment criteria are named with their source and version.
- Check the remediation strategy is deliverable on this site, with access, arisings routes and disposal classifications considered.
- Check the verification requirements are stated, because the verification report is what discharges the condition.
- Check the author's competence statement is present and specific.
Point 5 catches the reports that read well and cannot be built. A remediation strategy involving a 2 m cover system on a site where the levels are already fixed by the highway is not a strategy.
Illustrative example: a former vehicle repair site where the Phase 1 identified an underground fuel tank from a 1970s plan, the Phase 2 sampling grid missed it by 8 m, and the tank was found during groundworks. The delay was three months and the cost was the whole of the contingency. This example is illustrative.
For specialist technical reports, qualified professional input may be required. Appoint the consultant before you fix the levels, and give them the historic plans you already hold.
PlanScope drafts land contamination planning documents structured to UK planning policy, with investigation results, assessment criteria and remediation design left to the suitably qualified and experienced professional who carries out the work. See how professional review and sign-off works, or browse the full report list.
This is general guidance, not legal advice. Check the position with your local planning authority, the Environment Agency or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Is there a legal definition of a suitably qualified person?
Not a single statutory one. The expectation comes from national policy, the Environment Agency's land contamination risk management guidance and the British Standards on site investigation, all of which assume competent authorship. In practice competence means a relevant scientific or engineering discipline, direct experience of comparable sites, and familiarity with how councils and the Environment Agency apply the framework.
Does a quality mark declaration help with discharge of conditions?
Often. Where a report carries a suitably qualified person declaration under the national quality mark scheme, some authorities reduce or remove the third party review they would otherwise commission, because the checking has been done against a published standard. It is not a legal requirement, and it shortens the discharge of conditions.
What do council officers actually check in the report?
Who wrote it and their stated experience, whether the conceptual site model was updated after the intrusive work, whether the sampling rationale matches the sources and pathways identified, and whether the generic assessment criteria are named, current and appropriate to the end use. Superseded assessment criteria are a common and avoidable reason for reassessment.
Should geotechnical and geoenvironmental investigation be combined?
Wherever the programme allows, because mobilisation is the expensive part. Write one specification covering both scopes and make sure the reports share the same borehole log set. The disciplines want different samples from the same holes, so the specification has to cover shallow contamination sampling and deeper geotechnical testing explicitly.
How long does ground gas monitoring take?
Weeks rather than days. Representative monitoring needs multiple visits over a period, and those visits have to include falling and low atmospheric pressure conditions. It sits on the critical path more often than any other part of the investigation, so programme it before the design is fixed rather than after permission.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.