Contaminated sites are areas where the soil, water, or air has been polluted by hazardous substances. These pollutants can come from various sources, such as industrial activities, landfills, or chemical spills. The presence of these harmful materials can pose risks to human health and the environment. Cleanup and management of contaminated sites are essential to restore safety and usability. This process often involves assessing the level of contamination, removing hazardous materials, and implementing measures to prevent future pollution. Agencies like the Environmental Protection Agency (EPA) play a crucial role in overseeing these efforts and ensuring compliance with safety regulations.