15. In this Chapter, unless the context indicates a different meaning,“impurity” means any particle or fragment of material occurring in a mixture of residual materials covered by this Chapter, consisting of plastic, polymer, ceramic, glass, wood, plaster, cardboard, paper, reinforcing steel, pieces of metal, insulating material or any other construction or demolition material that is not a material covered by the second paragraph of section 14;
“residual granular material” means a granular material made up of one or more of the materials covered by the second paragraph of section 14;
“residual granular materials producer” means a person who stocks and, where necessary, conditions residual materials covered by this Chapter and stocks, distributes or sells residual granular materials produced from such materials.