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 real property cause or threaten to cause a nuisance pursuant to applicablestatutory or common law upon real property or to adjacent properties ; ( iv ) which contain without limitation polychlorinatedbiphenyls ( PCBs ), asbestos or asbestos - containing materials, lead - based paints, urea - formaldehyde foam insulation, orpetroleum or petroleum products ( including, without limitation, crude oil, natural or methane gas, or any component orderivation thereof ) ; or ( v ) which pose a hazard to human health, human safety, natural resources, animal health or welfare, employees, or the environment