Ground risk is commercial risk - A decision framework for cost and programme confidence
- 3 days ago
- 6 min read
Designed for Project and Programme Directors, Developers and Asset Owners
About Geotechnics
Geotechnics is one of the UK’s leading specialists in ground investigation. Since 1983, the company has provided geotechnical and geoenvironmental services across the full investigation lifecycle, helping clients replace ground assumptions with reliable evidence before those assumptions affect design, cost or programme.
Service | What Geotechnics provides |
Ground Investigation | Desk studies, investigation design, engineer-led fieldwork, trial excavations, cable-tool boring, rotary drilling, in situ testing and monitoring. |
Laboratory | UKAS-accredited soil testing, including classification, strength, compressibility, chemical and soil behaviour testing. |
Reporting | Desk study reports, factual reports, ground investigation reports and interpretive reporting for design and project decisions. |
Some of the industry’s most qualified and experienced in house engineers direct and supervise all fieldwork with all methods selected to suit the ground conditions, access constraints and the decision the project needs to make, rather than to fit a standard package. Site observations and laboratory results are then interpreted and reported so that project leaders, designers, and contractors can see what is established, what is still uncertain and what should happen next.
Executive summary
No project can remove every ground risk. The practical job is to gather enough evidence, early enough, to improve the decision and then make the remaining exposure visible, owned and managed.
Ground investigation is still too often treated as a self contained technical package. A scope is procured, fieldwork is completed and a report is issued, while the commercial consequences emerge elsewhere. Weak evidence then feeds conservative design, tender qualifications, risk premiums, change and delay, often without a clear line back to the original assumption.
A better approach it is to identify which ground assumptions could alter investment, design, procurement or delivery, then uses proportionate desk study, fieldwork, testing and interpretation before the relevant project phase.
The commercial case
Every capital project carries uncertainty. The purpose of an investigation is not to examine every conceivable condition or claim that all risk has been removed. It is to identify the uncertainties that could materially affect the project and obtain enough evidence for the commitment being made.
Ground risk can influence:
Business case and land value: whether the preferred site or option still stacks up once foundations, remediation, enabling works and disposal costs are understood
Design and quantities: whether assumptions about settlement, bearing conditions, groundwater or material reuse lead to over-design, redesign or uncertain quantities
Procurement: whether tenderers receive a consistent basis for pricing or add allowances, exclusions and qualifications
Programme: whether further investigation, dewatering, remediation, temporary works, access measures or approvals enter the critical path
Whole-life performance: whether unresolved conditions affect durability, resilience, maintenance or future liability.
The lowest ground investigation fee does not necessarily produce the best commercial outcome. The better result is to obtain the right evidence before a decision becomes too expensive to reverse.
Where ground risk hides
Ground risk covers geology, groundwater, contamination, made ground, buried obstructions, mining and cavities, existing structures, access constraints and environmental or heritage interfaces. It rarely appears as a single line in a business case. More often, it is embedded in working assumptions:
The foundation concept assumes competent material at a particular depth
The earthworks plan assumes excavated material can be reused
The programme assumes dewatering, treatment or third-party approvals will not become critical-path work
The tender assumes productivity that depends on access and the frequency of obstructions
The land value assumes remediation and disposal remain within an allowance.
An assumption does not become safe simply because it has not been written down. The uncertainty usually reappears in contingency, supplier pricing, exclusions, design conservatism or later change.
At acquisition, incomplete information can distort land value or the comparison between options. During concept design, it may lock in an unsuitable solution or encourage unnecessary conservatism. At procurement, inconsistent assumptions widen tender spread and qualifications. During construction, a departure from the design or pricing basis becomes change, delay, rework or claim. In operation, an unrecorded residual risk can become a maintenance, compliance or performance liability.
Where ground risk hides
The six stages below keep ground investigation tied to the decisions it must support. The same approach can be used at acquisition, option selection, design freeze, tender readiness, investment approval or any other gate where a ground assumption could materially alter the outcome.
Stage | Project Question | Practical Output |
1 | What must be decided? | Decision, date, owner, consequence and materiality threshold. |
2 | What is known, inferred and unknown? | Initial ground risk model built from desk study, site history, existing data and reconnaissance. |
3 | What evidence will change the decision? | Targeted fieldwork, testing and monitoring plan linked to material uncertainties. |
4 | What is the field evidence showing? | Supervised, quality-assured field delivery with agreed routes to adapt the scope. |
5 | What does the evidence mean? | Coherent ground model, derived parameters, scenarios and clear implications for design, cost and programme. |
6 | What risk remains and who owns it? | Residual risk treatment, named owner, contingency or pricing link, trigger and verification plan. |
Stage 1: Define the decision and the consequence
State what must be decided, when the decision is due and what happens if the underlying ground assumption proves wrong. Agree the commercial objective, constraints, materiality threshold and accountable owner before setting the technical scope.
This keeps the investigation from becoming a generic schedule of activities and establishes the level of confidence the project actually needs.
Stage 2: Build the initial ground risk model
Use the desk study, site history, available geological and environmental data, previous investigations, reconnaissance and stakeholder knowledge to separate what is known, inferred and unknown. Consider geotechnical, geoenvironmental, groundwater, access and existing asset issues together and where they interact.
Stage 3: Design the investigation
Focus on the questions most likely to change the decision. Every location, depth, method, sample, test and monitoring point should have a reason. The plan should also show where early findings could justify extending, redirecting or stopping an activity. The engineering question determines the investigation technique and testing methodology.
Stage 4: Execute, assure and adapt
Fieldwork needs experienced engineering supervision, reliable quality control and a quick route to interpretation. Site observations, sample quality, monitoring and testing schedules should be managed as connected parts of the same investigation.
When a result challenges a material assumption, the team should explain what has been found, decide whether the existing scope still answers the project question and set out the cost and programme effect of any proposed change.
Stage 5: Interpret and translate
Turn the investigation data into a coherent ground and groundwater model. Keep factual data separate from interpretation and assumptions. Then explain what the investigation confirms, what it changes, what remains uncertain and the implications for design, cost, programme, consent and procurement.
Stage 6: Allocate residual risk and verify
Decide which risks need further investigation, which can be avoided, retained, shared or transferred, and which must be monitored or verified during construction.
Keep the ground model live as design, monitoring and construction evidence develops.
What good output looks like
At the end of the ground investigation process, the link between the decision, the evidence and the commercial treatment should be easy to follow. In practical terms, the project should have an integrated and coherent ground risk model.
The report is only part of the deliverable. The real output is an evidence base that the project team can use for the next phase.
Where the framework is most useful
The commercial logic is the same across sectors, although the decisions and evidence requirements vary. On energy and utilities projects, the framework can align plant, route, brownfield, groundwater and access assumptions before major interfaces are fixed. On highways, rail, ports and coastal work, it can connect ground conditions with structures, earthworks, temporary access, environmental windows and existing assets. On industrial, commercial and regeneration schemes, it can link made ground, contamination, foundations, services and materials management to acquisition, viability, planning and future liability.
Nuclear facilities, data centres and other mission-critical assets require a particularly clear evidence trail for settlement, groundwater, resilience, long-term performance and construction sequencing. Whatever the sector, the value lies in identifying which ground assumptions could change the decision and obtaining
How Geotechnics supports commercial clarity
Geotechnics brings the main services together so that the line from the original project question to the evidence and final interpretation always remains clear:
Early ground intelligence: desk study, site history, environmental review and preliminary risk assessment to support investment and development decisions
Proportionate investigation design: fieldwork, sampling, in situ testing and monitoring focused on material risk and project stage
Engineer-led field delivery: qualified supervision, quality assurance and the ability to interpret and respond as evidence develops
UKAS-accredited laboratory testing: classification, strength, compressibility, chemical and soil behaviour testing linked to the project questions
Clear factual and interpretive reporting: evidence, assumptions, derived parameters, implications and residual uncertainty presented in a form the wider project team can use
Nationwide delivery: four offices, connected systems and flexible access to field, laboratory and engineering resource across the UK.
Conclusion
Ground risk is not confined to the investigation budget. It affects the investment case, design efficiency, procurement transparency, contingency and the credibility of programme commitments. Strong projects make that connection early: they start with the decision, target the uncertainty that could change it, adapt as evidence develops and carry the residual position into commercial governance.
When this is done well, ground investigation becomes more than a technical exercise. It gives project leaders a defensible basis for action and turns hidden exposure into a position that can be priced, owned and managed.
To discuss a decision-led ground investigation, contact Geotechnics at mail@geotechnics.co.uk, call 024 7669 4664 or visit geotechnics.co.uk/contact.
