In 2020, Cognition teamed up with Climate Care to offset our total annual emissions and becoming Carbon Neutral for the first time. In the same year, the company committed to stay proactive, adopting and developing more sustainable remediation methodologies, selection of materials and energy sources we use, reducing the need for offset element of our emissions. Our long-term goal is to continue improving efficiency and minimise emissions from our routine site and office operations across the board.
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A zero carbon company
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Tipner, Portsmouth

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The client:South East England Development Authority (SEEDA)
Services:Bioremediation, segregation, groundwater treatment, soil washing, stabilisation, chemical oxidation, PRB.

The Challenge:

The 1.7 hectare former PD Fuels Depot at Tipner formed part of the 44 hectare Tipner Regeneration Project that would transform the geographical area and provide a new gateway to Portsmouth. The site was located in a sensitive busy residential area adjacent to Tipner Lake, an SPA, Ramsar Site and SSSI designated tidal water body interconnected with Portsmouth Harbour. The site was heavily contaminated with a range of pollutants including TPH, PAH, SVOCs/VOCs and asbestos due to historic industry including a fuel depot, tar works and timber yard leaving the site contaminated.

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The Approach

Cognition was contracted by SEEDA to remediate site soils and groundwater in order to reduce the health risk to future residents. The key elements of these works included;

  • Remediation trials investigating a range of treatment options including Soil Vapour Extraction (SVE), Multi-Phase Extraction (MPE), soil washing, chemical oxidation, soil stabilisation/encapsulation and permeable reactive barriers;
  • Detailed studies investigating several bioremediation additives;
  • Concrete slabs broken out and trial pits excavated to delineate contamination;
  • Excavation, chemical testing and delineation of contamination;
  • Ex-situ bioremediation using cultured indigenous bacteria, biosurfactants, soil enhancers and nutrients;
  • Additional chemical additives applied to soils with a high BTEX concentration;
  • Groundwater and surface water treatment;
  • Pre-processing/screening of soil;
  • Soils stabilised prior to backfill and compaction with upper layers forming piling mats;
  • Environmental monitoring and controls put in place to manage dust and odour;
  • Clean capping installed across site to protect workforce during construction phase.

The Outcome

Cognition processed 80,000m3 of soil with 30,000m3 successfully bioremediated to meet the agreed re-use criteria and backfilled. Other remediation techniques such as groundwater treatment and a PRB were employed on the site to aid remediation. Treatment and re-use delivered significant savings over conventional disposal, as well as other benefits such as reducing site traffic and disruption in the local area.

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