Where a Phase 1 risk assessment has identified potential environmental risks that cannot be mitigated through an environmental management plan then a Phase 2 intrusive site investigation and quantitative risk assessment (generally referred to as an SI Report) is required.
In accordance with CLR11 & BS10175:2011 the intrusive investigation includes taking soil and water samples from bore holes and trail pits at predetermined locations targeting the area(s) identified as being potentially contaminated. It’s worth noting that your geotechnical survey can be undertaken at the same time with resulting savings.
The samples taken are then sent to an analytical laboratory to ascertain the presence of organic and inorganic chemical properties, with the resulting ‘data sets’ being evaluated, using the ‘Source-Pathway-Receptor’ model on either ‘a qualitative or quantitative’ basis, against suitable assessment criteria to determine the risks associated from identified contaminants. Ground gas monitoring may also be required and this can extend the reporting process.
The initial conceptual site model (link to it) will then be revised to include the recent findings. Where the identified contamination risks cannot be mitigated through an environmental management plan then an appraisal of remedial options with a resulting remediation strategy will be required.
For more information download our free guide on Phase 2 Site Investigations found on our resources page.
If you don’t know where to start, why not e-mail us or phone on (0800 0209 307) to find out more.