Contaminated Land Investigation

Kiwa CMT Testing investigates ground contamination on behalf of land-owners, developers, local authorities and other regulatory bodies. We are a UKAS accredited testing laboratory (No.0529) for this scope of accreditations.

We provide a complete service for the investigation of sites that incorporate all elements required that comply to BS10175:2015, CLR11, BS8485:2015, BS 5930:2015, BS3882:2015, BS EN 12579:2013, Assessments to WM3 (2015) and also incorporating the various Codes of Practice for Waste Assessments, re-use of soils and aggregates and assessments for the placement of water supply pipes (Water UK/Housebuilders Federation). 

Geotechnical and Environmental aspects of site investigation that includes documented history (Phase 1) along with intrusive techniques for the retrieval of geotechnical ground information that also utilises Coal Mining Risk Assessments and Intrusive Investigations for the installation and monitoring of ground gas for the development and refinement of Conceptual Site (and Exposure) Models.
Independent Remediation Options Appraisal, Verification and Validation of mitigating measures are also carried out by Kiwa CMT Testing’s highly qualified and experienced team of Site Investigators.


Phase One: Desk Study and Site Walkover

  • Appraisal of documentary material in line with BS10175:2015 and CLR11:
  • Previous history of the site
  • Adjacent land and features
  • Geology, Coal Mining History, Hydrogeology and Hydrology
  • Environmental sensitivity
  • Development of Conceptual Site (and Exposure Model)


Phase Two: Intrusive Site Investigation

  • Formulation of a suitable intrusive investigation strategy to:
  • Selection of appropriate equipment and techniques for suitable retrieval of ground information and environmental samples
  • Installation of ground gas and groundwater monitoring points
  • Window Sampling, Shell & Auger, Rotary Techniques
  • Additional investigation as appropriate


Laboratory Testing and Analysis

  • Appropriate chemical suites for soils and ground waters
  • Additional and specific chemical analyses for environmental assessment and waste classification
  • Composition of ground gases
  • Geotechnical testing and Foundation Recommendation Report (where required)
  • Initial Assessment for the suitability of Water Pipes
  • Where applicable: suitable testing with regard to re-use of materials on site


Detailed Quantitative Risk Assessments:

A range of risk assessment models can be run to assess the likelihood and magnitude of contamination and the impact posed to sensitive receptors, the assessments can include:

  • Statistical Analysis
  • Human Health Risk Assessment
  • Groundwater Risk Assessment
  • Hazardous Waste Assessment
  • Refinement of Conceptual Model

Other Investigation Types and Environmental Monitoring

There may be a requirement for other investigation types in poor ground, for example an investigation to determine of coal workings are present or indeed investigations to determine the depth of good founding strata or the influence of groundwater levels with regard to particular foundation designs.

Some complex sites may also require assessments for the concentrations and flow rates of ground gases or groundwater level monitoring.
  • Carbon Dioxide and Methane Monitoring
  • Gas Concentrations and Flow Rates
  • Groundwater Level Monitoring
  • Assessments for the impacts onto concrete types (e.g. Sulfate levels)

Options Appraisal and Remediation Verification/Validation

Remediation statements, validation sampling, testing and reporting including overall validation report for the specified remedial action taken on the site. Further refinement of the Conceptual Model as required.

Peer Review

Review, assessment and second opinion of existing reports on complicated sites given.

The Kiwa CMT Testing Contaminated Land Investigation Process Chart.