Complex Projects. Controlled Delivery

Complex Contamination Investigations (PFAS)

PFAS (“forever chemicals”) are fast becoming a critical risk driver in UK contaminated land projects. As regulatory scrutiny increases alongside the UK government’s developing PFAS strategy, engineering consultants need site investigations that stand up to challenge—technically, regulatorily, and defensibly.

GeoSonic Drilling is purpose-built for this challenge.

PFAS are highly mobile and easily redistributed during intrusive works. Conventional drilling methods, if not carefully controlled, can introduce cross-contamination and compromise datasets. Our approach is different: contamination-aware, method-led, and focused on protecting data integrity from the outset.

We engage early to support borehole design against the conceptual site model, anticipated geology, and hydrogeological conditions. This isn’t just input—it’s targeted technical guidance on screen placement, casing configuration, and aquifer sealing to control vertical migration and ensure representative sampling. The result is clearer datasets, fewer uncertainties, and reduced risk of rework.

Our use of sonic drilling is a key differentiator. By often eliminating the need for drilling fluids, we significantly reduce the risk of introducing contaminants or disturbing in-situ conditions. Sonic methods also deliver superior annular sealing and generate less waste—improving both data quality and site efficiency.

Operationally, we go further than standard practice. Dedicated mobile washdown systems enable full decontamination between boreholes, while strict material controls remove common PFAS-containing consumables from site. This level of discipline is critical for PFAS work—and not consistently achieved across the industry.

We also provide bespoke arisings containment systems, ensuring drill cuttings are fully controlled and compliant with environmental requirements.

For engineering consultants, this translates directly into value: higher confidence in groundwater data, stronger alignment with regulatory expectations, and a more defensible basis for risk assessment and remediation decisions.