Retail Unit – Lancaster

Retail Unit – Lancaster

Start Date:
5th October 2016

Wagon movements (reduced from 320)

Day Programme Time


Reduction in Imported Aggregate (from 3,000 to Zero tonnes)


Reduction in Export/Disposal (from 3,000 to Zero tonnes)


  • Geotech Soil Stabilisation were asked by Glanville Civil & Structural Engineers to design and implement an in situ stabilised solution to replace the traditional capping and sub base layer works at a store footprint in Lancaster to negate the need for cart and tip of non-hazardous soils containing asbestos.
  • From initial ground investigation reports the material was classified as non-hazardous with traces of asbestos which would be a costly construction if a traditional construction was implemented.
  • Over an area of 2,500m2 the design required a CBR strength of 30% and must be non-frost susceptible.
  • Geotech were able to successfully encapsulate the contaminants to the required specifications utilising their unique binder and in-situ mixing process.
Contaminated Land Encapsulation - McDonald's case study image 1 - Geotech

Project Details

Contaminated Land Encapsulation - McDonald's case study image 4 - Geotech
  • Samples collected from site and sent to UKAS accredited lab
  • To gain regulatory approval for stabilisation, Geotech undertook a suite of stabilisation trials (bench scale trials) to assess both the geotechnical and leachability performance to ensure that the optimal mix design satisfied the remedial objectives.
  • The results where then validated within a verification report.
  • As the treated material volumes were less than 1000m3 Geotech took advantage of the EA’s “Enforcement Position” and were able to obtain an exemption for the works which would mean that there was no requirement to deploy an Environmental Permit. However, Geotech were required to notify the Environment Agency of the duration, nature and control measures in place, and ensure that works were in line with best practise and legislation.
  • In conjunction with environmental consultants Pam Browne associates, a remediation strategy and materials management plan were produced, submitted and agreed by the relevant local authorities prior to works commencing on site.

Contaminated Land

Required strength: 150+MPa, strength achieved: average 365MPa


Carbon Footprint

Significantly reduced carbon footprint

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Building Footprints

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Car Parks

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