The present note highlights the role of geotechnical expertise for Risk Assessment of contaminated sites and illustrates specific aspects related to migration modeling. Implications of neglecting the time variable and the advantages of the direct measurements of vapors, performed by application of different techniques, are described and discussed. The comparison between direct measurements of vapor emissions and modeling outcomes show how the use of measured data is able to overcome the limitations deriving by restrictive model assumptions and effectively helps in obtaining more realistic results
