The environmental monitoring activity on the project "Passante di Mestre" has provided the detection of chemical characteristics, physical and biological soil of the project area in order to provide meaningful indicators to assess the main risks of degradation of pedosphere. All monitored sites are located near building sites and logistical support sites, as well as matching the most valuable natural areas.

The monitoring plan, during ante-operam phase saw the realization, for all monitored areas , the characterization of soils by executing drills and complete soil profiles. During construction activities, in the building sites and logistical support sites, all the appropriate investigations necessary to highlight any signs of compaction caused by vehicles used on construction sites were made.

As indicators of degradation were considered, for the construction phase, the apparent density and water retention. The most valuable natural areas (natural area "Former Cave Chalet - Salzano") was also consistently rated the pedosphere health, using the Index of Biological Soil Quality (QBS-ar).