Ground Risk Is Commercial Risk: Five Questions to Protect Cost and Programme

For Programme Directors, Developers and Asset Owners

Geotechnics is one of the UK's leading specialists in ground investigation. Since 1983, we have delivered geotechnical and geoenvironmental services on some of the UK’s largest infrastructure projects from desk study and investigation design through to engineering-led fieldwork, in situ and laboratory testing, to factual or interpretive advisory reporting.

We pride ourselves on having some of the industry’s most qualified and experienced engineers directing and supervising all fieldwork with methods selected to suit the site, whether that calls for trial pits, boreholes, specialist in situ testing, sampling or monitoring. Samples are tested in our UKAS-accredited laboratory, with all findings presented in a format that designers and project leaders can easily interpret and use.

For Geotechnics this holistic approach is key as leaving ground uncertainty unresolved for too long can mean it often reappears as extra contingency, conservative design, tender qualifications, delay, rework or a claim.

How ground uncertainty becomes cost

Ground risk rarely arrives as a single, obvious problem. More often than not, an assumption passes quietly from one stage of a project to the next:

• An uncertain ground profile becomes a conservative design allowance or a requirement for further investigation

• Unclear groundwater conditions become dewatering risk, a temporary works constraint or a tender qualification

• Unknown contamination changes material reuse, remediation and disposal costs

• Weak or compressible ground changes foundation strategy, earthworks quantities or settlement controls

• Buried structures, mining features or voids reduce productivity and create redesign, delay or, at worse, rework.

When the cost finally appears, the original uncertainty may be several decisions behind the project. As such, it is imperative that ground risk is commercially considered at the outset of any project, rather than merely describing it in a report once the work is complete. A worthwhile and meaningful investigation does so much more than simply produce borehole logs and test results; it replaces material assumptions with evidence while there is still time to act on it.

For Programme Directors, Developers and Asset Owners, this significantly reduces risks that can impact the business case, land value, design quantities, procurement strategy, programme and whole-life performance.

Five ground investigation questions project leaders should ask to protect cost and programme

1. Which decisions rely on assumptions about the ground?

At acquisition stage, the decision may be whether a site remains commercially viable once foundation, remediation and enabling costs are understood. At concept design, it may be foundation strategy, route selection, drainage feasibility or earthworks balance. Before procurement, it may be whether tenderers have enough consistent information to price on the same basis.

At Geotechnics, we believe in setting out the decisions, understanding when each one of these is due and determining which ground assumptions sit behind these. This gives the investigation a clear purpose and ultimately keeps effort focused on information that may change the commercial outcome.

2. Which conditions could materially change cost or programme?

Focus the evidence plan on conditions that could trigger a different design, construction method, consent route or sequence of work. Examples include:

A change from shallow foundations to piling or ground improvement

Groundwater requiring substantial control, monitoring or discharge arrangements

Contamination changing the materials management strategy

Weak or variable ground affecting settlement, slabs, roads or working platforms

Buried obstructions, mining or cavities reducing productivity

Environmental, heritage or access constraints limiting when and where work can take place.

Focusing the evidence plan in this way keeps time and budget focused on the uncertainties most likely to affect the decision.

3. How much confidence is needed at this stage?

Final-design detail is rarely needed during early option appraisal. Equally, a project should not reach land acquisition, investment approval or tender stage with evidence that is too weak for the commitment being made.

A proportionate strategy separates what must be known now from what can remain a stated assumption. Further investigation can then be phased around future decisions with the residual uncertainty, its owner and its possible consequence made clear.

4. Can designers, estimators and tenderers use the information?

The findings have to be usable by the people making the project decisions. Depending on the scope, Geotechnics can provide desk study reports, factual reports, ground investigation reports and interpretive reports. These can set out the ground and groundwater profile, soil and rock properties, derived parameters and the implications for foundations, earthworks, excavations, pavements, retaining structures and other relevant design matters.

At tender stage, the information should separate established facts from remaining uncertainty, state the assumptions to be priced and show where the residual risk is expected to sit. When bidders interpret the same information differently, comparison becomes harder and risk premiums are less transparent.

5. Who owns the risk that remains?

No investigation removes every uncertainty. Material residual risks should have a named owner, an agreed action and a clear link to contingency, pricing assumptions, contract strategy or construction verification.

The ground model should remain a live project control and be updated through design development, further investigation, monitoring and construction. A report on a shelf records the position at one point in time; it does not manage the risk.

What valuable and beneficial ground investigation looks like

At Geotechnics we believe, for ground investigation work to be beneficial, each part of the service has to support a project decision:

• Desk study and scoping: before any intrusive work is designed, reviewing site history, geological and environmental information, previous investigations and site constraints is key

• Engineering-led fieldwork: by selecting appropriate methods and supervising delivery we ensure safety, quality and the developing ground model remain connected

• Targeted testing: we use our in-situ, UKAS-accredited laboratory to test and establish properties and behaviours that matter to the project

• Decision-ready reporting: by distinguishing factual evidence from interpretation, we can state assumptions clearly and explain the implications for design, cost and programme

• Visible residual risk: by identifying what remains uncertain, we can determine what should happen next and who is responsible before the next stage.

An engineering-led, ground investigation partner earns their place by maintaining the link between desk study, site evidence, laboratory data and interpretation, then relating those findings to the cost and programme decisions the investigation was commissioned to support.

From ground data to commercial clarity

Programme Directors, Developers and Asset Owners need certainty and clear answers: What do we know? What remains uncertain? What could it change? What must happen before the next decision, and Who owns the remaining risk?

Answering those questions with clarity turns ground investigation into a practical way to protect investment, strengthen procurement and keep the programme moving with fewer late surprises.

Planning a development or infrastructure programme? Speak to Geotechnics about framing ground investigation around the cost exposure, design decisions and programme milestones that matter most.