BS EN ISO 21365:2020

What is ISO 21365 about?  

ISO 21365 discusses soil quality. ISO 21365 provides guidance on developing and using conceptual site models for potentially contaminated sites. 

A conceptual site model is a key part of every site assessment. A developmental site with a potential for contamination would benefit from a conceptual site model. ISO 21365 describes what conceptual site models are, and why they are used. ISO 21365 stresses the need for an iterative and dynamic approach to conceptual site model development. 

The conceptual site model explains contaminant sources and their potential for risk to receptors. The conceptual site model uses various pathways to communicate with stakeholders such as clients and other professionals. ISO 21365 walks you through the phases of creating a conceptual site model such as preliminary assessment, detailed investigation, baseline human health and environmental risk assessments, feasibility study, remediation (if required), and any subsequent construction or engineering works.  

Who is ISO 21365 for? 

ISO 21365 on conceptual site models is useful for all those who are involved in developing conceptual site models and by those who rely on using them. These include: 

• Developers 
• Landowners 
• Engineers 
• Regulatory bodies 
• Health and safety professionals 
• Environmental bodies 

Ideally, representatives from all phases of the investigative and remedial processes use ISO 21365.  

Why should you use ISO 21365? 

ISO 21365 provides a definition of the conceptual site model for contaminated sites consistent with other ISO standards related to contaminated land. ISO 21365 applies to the management of potentially contaminated sites, sites that are known to be contaminated, and also to land with naturally elevated concentrations of potentially harmful substances. 

ISO 21365 provides general guidance on the application of conceptual site models, how they are developed and how they can evolve, with respect to all media - for example, air, surface water, sediments, soil, groundwater, soil gas, biota, subsoil, including buildings and other artefacts.  

The conceptual site model is a synthesis of all relevant information about a potentially contaminated site with interpretation as necessary and recognition of uncertainties. The description relies on the concept of contaminant linkages that may be present. 

A good conceptual site model ensures that subsequent site decisions are the right ones  

A good conceptual site model ensures that subsequent site decisions are the right ones, avoiding blind alleys, lost opportunities, and wasted time and money.