definiens: means any wastes, substances, radiation, or materials ( whether solids, liquids or gases ): ( i ) whichare hazardous, toxic, infectious, explosive, radioactive, carcinogenic, or mutagenic ; ( ii ) which are or become defined as or other similar designations in, or otherwise subject to regulation under, anyEnvironmental Laws ; ( iii ) the presence of which on the Real Property cause or threaten to cause a nuisance pursuant toapplicable statutory or common law upon the Real Property or to adjacent properties ; ( iv ) which contain without limitationpolychlorinated biphenyls ( ), mold, methyl - tertiary butyl ether ( ), asbestos or asbestos - containing materials, lead - based paints, toxic mold, urea - formaldehyde foam insulation, or petroleum or petroleum products ( including, withoutlimitation, crude oil or any fraction thereof ) ; or ( v ) which pose a hazard to human health, safety, natural resources, employees, or the environment