Site name  Rowlands Castle, Hampshire

Description  Building Supplies Yard

Details  Site Investigation and Consultancy

Role  Environmental and Geotechnical Consultants

ASL were commissioned to undertake a site investigation in Rowlands Castle, Hampshire.  The site comprises a building materials and supplies yard, comprising office accommodation and storage facilities and the proposals comprised the construction of residential properties across the site.

The aims of the investigation were to provide a contamination assessment for the site together with a geotechnical assessment of the ground conditions ahead of the proposed redevelopment for a residential end use.

A site investigation was completed that identified a number of potential issues on the site including a leaking fuel tank pipeline, a possible slope failure, a solution feature beneath an existing building and poor near surface soakage potential.

A supplementary phase of investigation was completed to delineate the extent of fuel based contamination which identified a localised area for soils based remediation.  Further investigation was also completed to assess the potential for slope failure.  A deep borehole was constructed to allow the installation of a 100mm standpipe for soakage testing within the underlying chalk strata.

A solution feature was potentially identified at the corner of an existing building and further investigation of this area identified a water main that was found to have been leaking for a considerable length of time.  It was recommended to the client that the building be evacuated from the area of the solution feature and recommendations for the remediation of the solution feature were provided.  Further deeper investigations were completed to delineate the extent of the solution feature as part of the remediation works.  Houses in this area were recommended to be constructed with appropriately strengthened foundations and any access roads in this area were to include geogrid reinforcement within the subbase or capping layer to reduce the risks associated with collapse of any solution features.