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Reports for Planning desk study contaminated land remediation strategy
Tier 1 Contamination Assessment Report
Previously known as a Phase 1 desk study, a Tier 1 report is usually a pre-commencement condition. It uses historical mapping, searches and a site walkover to identify potential sources of contamination. If an exposure pathway connecting a source and receptor is also identified then this may require further investigation. If not, development may proceed without one.
Tier 2 Ground Investigation and Contamination Assessment Report
A ground investigation is undertaken to confirm desk study findings and address any concerns the Environment Agency or local authority Environmental Protection team has regarding the site.
It involves intrusive works typically including boreholes or trial pits to retrieve soil samples for laboratory testing and the installation of monitoring wells for groundwater and gas monitoring. The Tier 2 report includes a generic quantitative risk assessment and, if required, recommendations for remediating and managing contamination risks.
Remediation Strategy Document
If the Tier 2 ground investigation establishes a potentially complete SPR-linkage requiring remediation or protection measures then the Local Planning Authority (LPA) is likely to request a Remediation Strategy document.
In line with the Environment Agency guidance, Land Contamination Risk Management (LCRM, 2021), the document will include options appraisal, a remediation strategy and verification plan.
Verification Report
Verification of remediation will demonstrate to the LPA that the remediation strategy has been successully implemented and any remaining contaminated land conditions can be discharged.
Verification normally involves a combination of site inspections, sampling, testing and checking site records (e.g. disposal, imported soil, membrane installation, etc). The report will be LPA and NHBC compliant.
Piling Risk Assessment
A Piling Risk Assessment (also referred to as a Foundation Works Risk Assessment) ensures that the most appropriate piling technique is selected, primarily for the protection of groundwater within deep, confined, aquifer layers.
The PRA is also applicable to penetrating ground improvment methods, such as stone columns etc. It also considers risks to human health from exposure to soil contamination and ground gas release.
The PRA is prepared in line with guidance published by CIRIA and the Environment Agency.
Major Hazard Installation Risk Assessment
If development is proposed within the consultation distance of a major hazard installation (MHI), such as a high pressure gas pipeline or oil refinery, then the LPA will need to consult with the HSE.
In instances when the HSE 'Advises Against' development an MHI risk assessment can help planning consultants optimise site layout and remove the HSE objection.
An MHI risk assessment, previously known as PADHI assessment, is prepared using the HSE's land use planning methodology.