The remedial design on this mixed heritage site was adapted as the works progressed, with full regulatory approval, to take into account the unexpected ground conditions relating to asbestos in soils. It is estimated that once treated in accordance with the agreed remedial strategy, these adaptions negated the need to remove 10,000m3 of impacted soils to landfill.

Due to the unexpected shortfall in concrete floor slabs and foundations, in addition to site specific engineering constraints, the design was also adapted to allow the stabilisation and re-use of geotechnically poor material in highways and infrastructure. It is estimated that by not needing to remove the geotechnically poor material from site and import aggregates to replace the shortfall, 2,159 tonnes of CO2 were saved.

In addition, 50,000m3 of material was treated using advanced bioremediation techniques for re-use in accordance with the agreed remedial strategy. It is estimated that we saved around 5,300 unnecessary lorry movements and 1,000 tonnes of CO2 using this application.

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