16. For purposes of its reclamation as a residual granular material, a residual material may not contain(1) firebrick, asphalt shingles or roof gravels coated with bituminous compound;
(2) asbestos or lead paint;
(3) reinforcing metal in a size exceeding that of the residual granular material;
(4) where it comes from land for which a characterization pursuant to Division IV of Chapter IV of Title I of the Act or a voluntary characterization has been performed, contaminants identified by the characterization and not listed in tables 1 and 2 of Schedule I to this Regulation, except in the case of a category 4 material.