PROJECT DESCRIPTION

GWP Consultants LLP (GWP) has conducted a Hydrological and Hydrogeological Impact Assessment for a proposed extension to a Limestone Aggregate Quarry in Oxfordshire.

CHALLENGE

The proposed extension lies within a hydrologically sensitive area, with existing water bodies, wetland habitats, and nearby watercourses, including Sites of Special Scientific Interest (SSSI). The surrounding region has been historically impacted by landfill sites, railways, and roads, leading to poor water quality in certain areas. Managing water resources, groundwater flow, and potential environmental impacts present significant challenges for the project.

SOLUTION

A comprehensive solution to address the hydrological and hydrogeological challenges associated with the Quarry extension was proposed. During the operational phase, a system will be implemented to collect and manage surface water and groundwater through sump excavation, settlement ponds, and attenuation and infiltration basins. Numerical groundwater modeling was carried out to guide the dewatering process and mitigation of impacts on nearby receptors. Moreover, a carefully designed restoration plan, including low permeability backfill and engineered clay liner, will ensure that groundwater flow is appropriately managed, avoiding potential flooding risks and safeguarding sensitive habitats.