Where a site investigation identifies the presence of contaminants on site which pose a risk to human health or to the environment, a Remediation Strategy report will be required by the local planning authority to detail the mitigation measures required to ensure a safe development.
Remediation measures could include the placement of clean cover soils over the Made Ground, the removal of contaminated soils or the installation of radon or gas protection measures in buildings.
The Remediation Strategy details what is required for the development and how the actual construction or performance of the measures will be verified.
Contamination Remediation Supervision and Validation
Where there is a requirement for remediation works to be undertaken, it is essential that the works are supervised and documented by an experienced Geoenvironmental Engineer.
The Engineer will work with the remediation contractor to ensure works are completed in accordance with the approved Remediation Strategy and record the progression of the works to confirm that materials are used in order that they do not pose a risk to human health or to the environment.
On completion the Engineer and Project Manger will prepare a Verification Report for submission to the local planning authority confirming that the required works have been completed in a satisfactory manner enabling discharge of the relevant planning conditions.
Engineering Supervision and Validation
Re-profiling (cut/fill) of a site may be required to facilitate development, for example on on sloping sites or where changes in levels are required to allow gravity drainage.
In such cases selection and re-engineering of site materials will be required to ensure a stable development platform, and to enable the use of engineered fill as a founding material for roads and structures.
Assessment of the geotechnical properties of site derived soils is essential to identify the most appropriate and cost effective compaction technique.
Gas Protection Measures Implementation Plans
Where ground gas monitoring and gas risk assessment identifies a requirement for the installation of ground gas protection measures, it is now a condition of BS8485 that a verification and implementation plan be prepared to enable agreement to be obtained from the local planning authority.
The implementation plan details how protection measures are to be designed into the foundation, the experience and qualifications of the installers, and the methods and frequencies of verification
More information on our ground gas validation services can be found here.