1 Definitions Contamination • the presence or accumulation of any Hazardous Substances at, in, on or under the Premises Aggravated Contamination • any accumulation, increase, discharge, spillage, leaching, disposal, dispersal, emission, changes to substances, escape, release, migration, acceleration or exacerbation of any Existing Contamination which has been caused or knowingly permitted by the Tenant or its agents, contractors or employees Environment • all or any of the following media, namely air (including the air within buildings and the air within other natural or man-made structures above or below ground), land and water (including surface water and groundwater) and any ecological