Konect Phase 2
Ground Risk Ltd was commissioned by HPREF I Konect Investments S.a.r.l. to undertake a Preliminary Risk Assessment of Karst Hazards for Konect Phase 2, a large brownfield regeneration site at the former Kellingley Colliery.
Introduction
The site is underlain by Permian bedrock containing gypsum, a highly soluble material capable of forming voids and sinkholes under certain hydrogeological conditions. The assessment combined an extensive desk based review of historic investigations and regional geology with targeted fieldwork, including MASW geophysics, deep borehole drilling, CPT testing and groundwater monitoring, to understand the nature and extent of gypsum dissolution beneath the site.
Key info
HPREF I Konect Investments S.a.r.l.
Preliminary Risk Assessment of Karst Hazards.
Kellingley Colliery.
Results
The study identified gypsum dissolution as the key geohazard and demonstrated that risk is strongly controlled by variations in bedrock cover thickness and proximity to geological faulting, particularly the North Stubbs Fault. Using this evidence, Ground Risk divided the site into four preliminary karst risk zones and provided clear, proportionate recommendations for further investigation, foundation design and mitigation measures tailored to each zone. Crucially, the assessment showed that widespread catastrophic collapse was unlikely provided the existing hydrogeological regime is maintained, allowing the development to progress with informed design decisions, targeted risk management and a robust, defensible strategy for planning and detailed design.
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