Investigation of contaminated sites and risk assessment

The investigation of contaminated sites involves three steps as follows:

  • Preliminary investigation.
  • Detailed investigation.
  • Assessment of risks associated with contaminated sites.

Preliminary investigation involves identifying potential sources of contamination, potential migration routes and receptors, as well as geological, hydrogeological and hydrological conditions of the site.

The preliminary investigation begins with the development of the conceptual model of the site, which is the simplified representation of the way in which the contamination of the receptors is presumed in the real geological media, based on qualitative and quantitative analysis of the existing data. Subsequently, the conceptual model of the site is updated as new information is identified.

ENVIROLAND analyzes all available information and prepares the preliminary investigation report so that it can be used to design the detailed investigation phase. The preliminary investigation report prepared by ENVIROLAND contains maps and other graphic representations so that it can be understood by all readers, regardless of their background.

The detailed investigation involves sampling soil, groundwater and/or vapor and analyzing them in authorized laboratories to establish the presence of contamination. The detailed investigation consists of two phases, of which the first phase is mandatory:

  • The investigation itself (main).
  • Additional investigation – in which investigation points are added around the contaminated points to delineate the contaminated areas.

ENVIROLAND carries out the detailed investigation by drilling in dry regime with mechanized and manual installations. During fieldwork, ENVIROLAND measures the concentration of volatile organic compounds, groundwater quality parameters, water level and performs aquifer permeability tests. All fieldworks in the detailed investigation phase are intended to provide sufficient information for the risk assessment and to provide an overview of the site to reduce costs in the remediation phase. At the client’s request, ENVIROLAND can also develop geotechnical studies to reduce the costs associated with drilling works.

Risk assessment is a process through which the risks posed by the contaminated site to human health and the environment are identified and assessed. ENVIROLAND assesses the risks associated with the contaminated site for both existing and future use of the site. The correct identification of the risks is useful in the following phases, as remedial objectives are established based on the results of the risk assessment.

The detailed investigation and the risk assessment of the contaminated site are processes that take place simultaneously, and ENVIROLAND optimizes all activities based on client’s needs.

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