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Remediation design, Waste Characterisation & Verification

Overview

3.1_overview.jpgLEAP has a wealth of experience and knowledge in designing and managing land remediation projects. This case study highlights a 42 unit housing redevelopment of a former Iron Foundry and latterly a vehicle servicing yard. LEAP was involved from initial site investigation through detailed remediation design and costing, to final verification and sign off with the regulators. LEAP also provided all the geotechnical support for this site with issues such as sustainable drainage being at the forefront.

Description and Investigation Design

The site is located on the former flood plain of a major river. Historically levels had been raised by 3m with foundry waste. This together with subsequent use of the site for vehicle maintenance had resulted in widespread soil contamination. Planning considerations required a complete remodelling of site levels to provide flood compensation areas and to raise the developable area above the flood line. Previous remediation cost estimates by others, based on a simple dig and dump solution had proved to be prohibitively expensive.

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LEAP Solution

LEAP worked alongside the regulators, the archaeologists and the remediation contractors to provide a working design that satisfied all of the stakeholders, minimised remediation costs and provided a workable and sustainable solution. The site was mass excavated and all soils screened to segregate asbestos cement fragments and larger scrap metal and foundry glass from the matrix of foundry sand and reworked natural soils. Careful segregation and laboratory testing was used to identify fines fractions suitable for re-use on site and this included a large volume of foundry sand which was eventually used on site for the manufacture of topsoil which was then used within the development in the expanse of public open space. Method specifications were provided to the contractor for selection and compaction of otherwise clean treated material for reuse beneath permeable paving, buildings etc.  Waste characterisation reports were provided for the limited surplus soils.

LEAP provided verification services throughout the project to ensure regulatory compliance and sign-off.

Project Overview


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Client

National Housebuilder

Location

South Midlands

Sevices Provided

  • Review of previous 10 years of site investigation reports and desk studies carried out by others
  • Limited supplementary intrusive soil, ground water and land gas investigations
  • Site Investigation for geotechnical design parameters
  • Detailed quantitative risk assessment, initial remediation design and costing prior to site acquisition
  • Waste Characterisation Reporting
  • Liaison with stakeholders and provision of final remediation and geotechnical design.
  • Watching brief over site remediation and provision of final verification report

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Added Value

  • LEAP provided a remediation strategy which based on careful delineation, treatment and then onsite re-use of the majority of the previously contaminated soils served to reduce potential remediation costs by several hundreds of thousands of pounds.

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