Test aimed at determining the content of nitrogenous organic solvents in a sample of excavated soil (pursuant to Legislative Decree N ° 152 03/04/2006 table 1 All.5 part IV) or refusal (classification according to D .Lgs. N ° 152 03/04/2006 according to the criteria set out in Annex VI of Directive 67/548 / EEC)