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Risk Assesment
The analysis of environmental risk has been historically developed as a tool to evaluate the toxicity data of substances to which the population is or may be exposed and to quantify the potential risks to health.
In particular risk analysis provides a decision support and justification for the design and management of environmental mitigation, environmental monitoring systems and operational procedures.
Under Italian legislation, the application of risk analysis is being considered as a tool used to justify a less reclamation push than normal, ie a remediation covering the achievement of acceptable values, but different from those of D.Lgs. 152/06.
The main condition required by law to proceed on the basis of risk analysis, remediation less thrust than normal recognition of non-availability and / or feasibility BAT cost bearable.
In relation to the above arguments study TETHYS can provide adequate support for the realization of analyses of site-specific risk based on the most common programs used: RBCA (Risk-Based Corrective Action), Judith, Rome, Silvia, Euses, etc. …
The procedure for assessing risk you can 'perform in different stages of implementation in line with the conceptual model of the site, these phases are:
-- Level 1: comparison of the values of concentration of pollutants with the values for a site hypothetical generic conceptual model (Annex 1 of DM 471/1999, All.5 Title V Leg. 152/06), in adopting precautionary conditions of the worst scenario reasonably possible.
-- Level 2: where one considers exposure to certain pollutants and possible targets based on simplified models, at this stage it is necessary to have a conceptual model site-specific.
-- Level 3: where is realized full risk analysis in which you first detect additional environmental data and then proceed to their interpretation with numerical models and deterministic or probabilistic.

The ways in which you can use the potential of risk analysis require that it be used only in case of environmental remediation and restoration with security measures, assessing the acceptability of risk on the residual concentrations left in situ after the speeches made.
In an analysis for structured degrees is important to note that:
• The degree of protection of human health and the environment is greater than or unchanged;
• recruitment conservative calculations introduced in fall;
• the effectiveness of interventions environmental remediation increases.

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