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Site Investigation

Constructive Evaluation has a team of experienced Geo-Environmental specialists, able to provide full Contaminated Land assessments or soil screening as necessary to fulfil the requirements of construction projects and to satisfy the planning process.

Geo-Environmental Services

As part of the company’s core Ground Investigation services, Constructive Evaluation provide comprehensive Geo-Environmental or ‘Contaminated Land’ Risk Assessments and soil screening surveys.

Our team of Geo-Environmental specialists are able to advise on the most appropriate form of sampling and analysis required to suit the requirements of your project; please contact Graham Carter or Max Smeeth at our office to discuss your requirements further.

As part of the National Planning Policy Framework, local responsible planning authorities may enforce an environmental study upon a developer to ensure that Human Health and the safety of the wider environment are suitably protected through the development process as part of applied planning conditions. Typically a Geo-environmental survey will follow the following format.

Phase 1 Preliminary Risk Assessment
This is a non-intrusive study which takes into account the past and present uses of an area through on-site reconnaissance as well as study of historical maps, industrial / trade records and the environmental setting. This allows a list of relevant potentially contaminative land uses to be established for the site in question.

Once the potential contaminated land hazards are identified, the relevant level of risk is determined for each in relation to the specific development proposals for the site in question, checking whether tangible pathways exist to relevant human health and environmental receptors within a Preliminary Conceptual Site Model. 

This allows any potentially unacceptable risks to be identified and an action plan to be produced for intrusive investigations and analysis.

Phase 2 Intrusive Site Investigation
The second phase of the investigation process utilises ground investigation techniques such as percussive boreholes and trial pitting to allow recovery of representative and appropriate samples in order that the necessary analysis can be conducted complete the risk assessment from the Phase 1 report.

Intrusive land drilling work also allows standpipe wells to be installed to allow monitoring of soil / landfill gases and groundwater quality should this be a requirement of the Risk Assessment process.

All samples are analysed at UKAS and MCERTS accredited laboratories, with gas and vapour monitoring conducted using calibrated specialist apparatus.

Once the intrusive work and analysis is complete, the findings are used to update the Conceptual Site Model, allowing our consultants to advise what, if any, remedial measures are needed for the proposed development or whether any further testing is required. 

Investigation can be tailored to suit the specific needs of the project, including testing for Waste Disposal, or Detailed Quantitative Risk Assessment (DQRA) as required. 

Constructive Evaluation are also able to offer soil screening services in lieu of a full Phase 1 and Phase 2 survey as may be required for due diligence or warranty company requirements.

Phases 3 & 4 Remediation and Validation
Once the control measures and remedial actions required to adequately protect human health and environmental receptors have been established by the Phase 2 report, these relevant controls are detailed in a Remediation Method Statement which is produced for approval by the Local Authority and Environment Agency.

This report will detail how control measures are to be recorded and by whom.

It is imperative that these control measures are concisely recorded through the build programme, in order that the Phase 4 Validation Report can be produced upon their completion. This report serves as a record for the relevant consultees that any unacceptable risks have been suitably controlled and remediation works completed.

The record of necessary remedial works, and their correct implementation are then submitted to gain discharge of relevant planning conditions.