Commercial Redevelopment, Herefordshire

A Phase 2 trial pit and window sample borehole investigation was carried out to provide geotechnical and contamination recommendations for a new builders' yard and timber yard, following a Phase 1 Assessment previously carried out by Ruddlesden geotechnical.

The desk study revealed the site to have previously been occupied by a clay pit (subsequently infilled), brick works and petrol filling station, before its most recent land-use as a garden centre.

The intrusive site investigation found that contamination levels presented no significant risk of causing harm to human health or to controlled waters.

However, significant depths of made ground, soft underlying natural deposits and a high water table were encountered. Therefore, piled foundations were recommended to support the proposed new buildings.

The made ground often contained biogenic materials and so ground gas monitoring was undertaken. The ground gas monitoring identified moderately high levels of carbon dioxide (potential asphyxiant) and methane (potentially explosive). Elevated levels of volatile organic compounds (VOC's) were also recorded by the photo-ionisation detector (PID). Recommended gas protection measures included a proprietary gas proof membrane, installed by a speciliast contractor, and subfloor ventilation.

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Commercial Redevelopment, Herefordshire image

Commercial Redevelopment, Herefordshire image