Residential Remediation Portfolio

Customer:National Grid Property Holdings

Value: £2.3 million

Through National Grids’ ongoing commitment to clean up historic legacy sites 21 residential properties were identified as requiring remediation.

These 21 properties were distributed across 10 distinct sites throughout the south and south east of England. All of the properties were occupied by long term tenants and were remediated whilst the tenants remained in occupancy.

Across the various sites there were a number of typical contaminants known to be associated with the manufacture of Town Gas. These key and potential contaminants included:

  • Heavy metals;
  • Total Petroleum Hydrocabons (TPH) and;
  • Polycyclic aromatic hydrocarbons (PAH) of which typically Benzo(a)pyrene was the key contaminant of concern.

The works involved the excavation of all soils to a depth of 600mm below original ground level, disposal of excavated soils, validation of basal formations and reinstatement using clean, certified imported fills. The sites were then landscaped to an agreed design.

The remediation works were undertaken whilst the tenants remained in occupancy and this required careful planning, co-ordination, communication and monitoring. To enable the works to be undertaken in a safe and timely manner it was essential to maintain an ongoing dialogue with both the residents and those adjacent.

Key considerations were:

  • Resident access and egress: at all times both during working hours and thereafter it was essential to maintain 2 safe means of access and egress;
  • Traffic Management: plant and large road vehicles were regularly required to work within a residential setting and this had to be managed to avoid negative impacts on those affected by the works and;
  • Potential Environmental Impacts: Noise, dust, vibration and odour / vapour were both controlled and monitored at all times.

These works removed potentially harmful contaminants from residential properties and were completed on programme and within the budget.

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