4. The following may not be disposed of in contaminated soil burial sites: (1) soils that contain 1 or more substances with concentrations equal to or greater than the limit values in Schedule I except
(a) if they are disposed of in a site referred to in section 2;
(b) the soils from which at least 90% of the substances initially present in the soils were removed by means of a treatment authorized under the Act and, in the case of removed metals and metalloids, only if they were stabilized, fixed and solidified by an authorized treatment;
(c) where a detailed report proves that a substance present in the soils may not be removed in a proportion of 90% following an authorized optimal treatment and there is no available technique for that purpose;
(2) soils having more than 50 mg of PCB per kg of soil;
(3) soils that, after segregation, contain more than 25% of residual materials;
(4) soils containing explosive or radioactive materials within the meaning of section 3 of the Regulation respecting hazardous materials (chapter Q-2, r. 32) or materials incompatible, physically or chemically, with the materials making up the burial site; and
(5) contaminated soils containing a free liquid, according to a standard test carried out by a laboratory accredited by the Minister under section 118.6 of the Act.