Who may prepare a contaminated land report
Authorities judge the competence of a contaminated land report from what it shows about its author. Chartered status, site experience in the right contaminant group, and a named sign-off.
A contaminated land report submitted with a planning application has to be prepared by a suitably qualified and experienced person, and no single licence or register defines that phrase. National policy puts responsibility for securing a safe development on the developer and the landowner, and the local planning authority judges competence from what the report shows about its author. In practice that means a named individual with relevant chartered status, demonstrable site experience in the contaminant and ground conditions at issue, and professional indemnity cover that matches the risk.
Developers get caught out in two directions: instructing a driller who produces logs but no risk assessment, or instructing a desk study specialist to interpret an intrusive investigation.
What suitably qualified and experienced means
The phrase comes from guidance rather than statute. The Environment Agency's Land Contamination Risk Management guidance, which replaced the older CLR11 model, is the reference most authorities work from, and it expects each stage of the process to be carried out by someone competent for that stage.
Competence has three parts. Technical knowledge, evidenced by a relevant degree and a chartered qualification. Experience of the specific contaminant group, ground conditions and receptor pathway in question, evidenced by comparable projects. And professional accountability, evidenced by membership of a body with a disciplinary code and by insurance.
Chartered routes that authorities recognise include Chartered Geologist with the Geological Society, Chartered Scientist, Chartered Environmentalist, Chartered Engineer and chartered membership of the Chartered Institution of Water and Environmental Management. None of them is a licence to practise in this field. Each is evidence of a baseline.
What matters as much is who signs. A report signed by a graduate consultant and countersigned by nobody invites a request for further information. A report whose author, reviewer and approver are each named with their qualifications rarely does.
BS 10175 and the competence expectation
BS 10175, the code of practice for the investigation of potentially contaminated sites, is the standard the investigation is measured against. It sets expectations on desk study content, the conceptual site model, sampling strategy, sample handling, analysis and reporting, and it is explicit that the work should be directed by suitably qualified and experienced people.
Two parts of the standard cause the most argument on planning applications. The first is the adequacy of the sampling strategy: how many locations, at what spacing, to what depth, and how the strategy responds to the conceptual site model rather than to a grid drawn for convenience. The second is laboratory accreditation. Analysis should be carried out by a laboratory accredited for the specific determinands, and a report that does not state the accreditation position will be queried.
Ground gas has its own literature and its own competence expectation. Monitoring rounds have to cover a range of atmospheric pressure conditions, and interpreting them into a gas protection requirement is a specialist judgement rather than an arithmetic exercise.
Registers and certification schemes
Several schemes exist to make competence easier to verify. None is compulsory.
| Scheme | Who runs it | What it signals |
|---|---|---|
| Specialist in Land Condition register | Industry registration body | Assessed individual competence across land condition disciplines |
| National Quality Mark Scheme | Industry scheme for land contamination management | Reports signed off by an assessed suitably qualified person |
| Register of Ground Engineering Professionals | Institution of Civil Engineers | Assessed competence in geotechnical and geoenvironmental practice |
| Chartered status | Geological Society, CIWEM and others | Baseline technical qualification and a code of conduct |
Some authorities' validation lists and conditions now name the national quality mark scheme or ask for a suitably qualified person's sign-off, which shortens the discharge of conditions process considerably. Ask the authority at pre-application stage whether it does, because specifying the scheme in the appointment is far easier than retrofitting it.
Phase 1 against Phase 2 competence
The two stages need different people, and the overlap is partial.
A Phase 1 preliminary risk assessment is a desk study plus a site walkover producing a conceptual site model. The competence it needs is historical map interpretation, knowledge of former industrial processes and their contaminant signatures, hydrogeology sufficient to identify pathways, and the judgement to say whether intrusive work is needed. A good Phase 1 can be written by an experienced environmental consultant without any drilling capability at all.
A Phase 2 generalised quantitative risk assessment needs the Phase 1 competences plus investigation design, supervision of intrusive works, sample handling and chain of custody, selection and derivation of assessment criteria, and the statistical treatment of results. A Phase 2 written from someone else's borehole logs, by an author who was never on site, is the single most common weakness in submitted reports.
Both stages link through to one product page: a contaminated land assessment covering Phase 1 and Phase 2. A competent professional is legally required for this work, and an AI-assisted draft is a starting point for that professional rather than a substitute for them.
Risk assessor against remediation designer
Assessing risk and designing the remedy are separate skills, and a firm strong at one may be weak at the other.
The risk assessor's product is a conceptual site model, a set of generic or site-specific assessment criteria, and a conclusion on whether unacceptable risks exist to identified receptors. The remediation designer's product is an options appraisal, a remediation strategy, a verification plan setting out how success will be demonstrated, and ultimately a verification report.
The verification plan is where developers lose money. Agreed before works start, it tells the contractor what evidence to collect as material is removed, imported or treated. Written afterwards, it turns into retrospective justification, which authorities resist and which sometimes means digging again.
Where an earthworks contractor offers to handle remediation design as part of a package, keep the verification role independent. The person confirming that the remedy worked should not be the person paid to deliver it.
What the regulator will reject
Environmental health and contaminated land officers see the same failings repeatedly.
- No conceptual site model, or one that lists sources without linking them to pathways and receptors.
- A site walkover that clearly did not happen, with no photographs and no record of current site condition.
- Sampling locations on a regular grid with no relationship to identified hotspots.
- Assessment criteria applied to the wrong land use, most often residential criteria substituted for commercial or the reverse.
- Ground gas conclusions drawn from too few monitoring rounds, or rounds taken only in stable weather.
- Laboratory accreditation not stated for the determinands reported.
- No verification plan where remediation is proposed.
- An unnamed or unqualified author.
Any one of those will produce a holding objection. Two or three will produce a condition requiring the whole assessment to be redone, after permission and under programme pressure.
Briefing a ground investigation
Write the brief around the conceptual site model, not around a number of boreholes.
- Supply the Phase 1 report, the site layout, proposed levels and foundation concept before asking for a fee.
- State the end use and the receptors, including gardens, allotments, water supply and any controlled waters.
- Ask for the sampling rationale in the proposal, tied to the model, with the number and depth of locations justified.
- Specify laboratory accreditation for the determinands expected.
- Specify the number and timing of ground gas monitoring rounds, and who interprets them.
- Require named author, reviewer and approver with qualifications, and ask whether sign-off under a recognised scheme is available.
- Ask for the geotechnical and geoenvironmental scopes to be combined where foundations will need the same holes, which saves a mobilisation.
Fixing the scope in writing before the fee is agreed is what keeps the price stable, and the approach set out in briefing a specialist so the fee stays fixed applies directly. Where a funder or purchaser will rely on the report, settle the reliance letters and collateral warranties at appointment rather than at completion. The way authorities test author competence here mirrors what suitably qualified means for a heritage statement, and PlanScope's professional directory is the route to a reviewer who can take responsibility for a draft.
This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.
For specialist technical reports, qualified professional input may be required. Browse the PlanScope report types to see which ground-related documents a site is likely to need. 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 licence to write contaminated land reports?
No. There is no statutory licence. National policy places responsibility on the developer and landowner, and the local planning authority judges whether the author is suitably qualified and experienced. Chartered status with a recognised body, demonstrable experience of the relevant contaminants and ground conditions, and a named sign-off are what authorities look for.
What is the National Quality Mark Scheme?
It is an industry scheme under which land contamination reports are signed off by an assessed suitably qualified person. It is voluntary, and some authorities name it in validation lists or conditions because it shortens their review. Ask at pre-application stage whether the council recognises it, then specify it in the consultant's appointment.
Can the same consultant do both Phase 1 and Phase 2?
Often yes, provided the firm has investigation capability as well as desk study expertise. The competences differ: Phase 1 needs historical interpretation and conceptual model building, while Phase 2 adds investigation design, supervision of intrusive works, sample handling and the derivation of assessment criteria. A Phase 2 written from someone else's logs is a common weakness.
Why does a verification plan matter before works start?
It tells the contractor what evidence to collect as material is removed, imported or treated, so the verification report can be written from records rather than assumptions. Produced afterwards it becomes retrospective justification, which authorities resist. The worst outcome is re-excavating to obtain evidence that should have been collected first time.
Should the remediation contractor also verify the works?
No. Keep verification independent of delivery. The person confirming the remedy worked should not be the person paid to deliver it, because the authority has to rely on that confirmation when discharging the condition. Many councils will question a verification report signed by the contractor who carried out the earthworks.
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.