Asbestos remediation

Ground and Water’s ApproachThis remediation was achieved by Ground and Water through the machine excavation and hand-picking of the soils, with the removed layer being stockpiled on an impermeable liner adjacent to the site area and further hand-picked for visible asbestos fragments. This was undertaken by Ground and Water Technicians, who in addition to wearing full PPE (Tyvek suits, face-fitted respirators, gloves, boots & eye protection) were also actively damping down the soils during the excavation.

The OutcomeThe developer’s potential asbestos nightmare was averted, thanks to a sound remediation plan and lots of elbow grease. Following the stockpiling and hand-picking of soils, visual inspection and representative sampling was taken from both the reduced formation level of the site area, the stockpiled material and the surface level immediately surrounding the site area to test for asbestos contamination. This revealed no visual evidence of asbestos contaminated materials and no laboratory results showing asbestos contamination across the formation level of the site area. Two positive identifications of asbestos were present within the stockpile samples tested, comprising bundles of Chrysotile present within SPF/0.10m bgl (at a quantification of 0.004%), and bundles of Chrysotile and Amosite within SPJ/0.10m bgl (at a quantification of 0.023%). These were risk assessed in accordance with CIRIA733, which revealed only one of these posed an unacceptable risk to end-users of site in a residential setting.

It was concluded that the site area where remediation had been undertaken was now safe for redevelopment and that although the stockpiled soils would require further remediation in order to be suitable for use within residential garden areas. In their present state they were suitable for use beneath areas of hard standing. This remediation and Ground and Water’s subsequent recommendations has allowed the client to continue development of the site.