What is a key requirement for the disposal of contaminated filter media in intermittent sand filter systems?

The key requirement for the disposal of contaminated filter media in intermittent sand filter systems is that setbacks and vertical separations must meet local guidelines. This is crucial because local regulations are designed to protect public health and the environment by ensuring that the disposal of waste materials does not contaminate groundwater or surface water supplies. Adhering to these guidelines helps to minimize the risks associated with contaminated materials and ensures that adequate distances are maintained between the disposal site and sensitive areas, such as wells, lakes, and residential properties.

In contrast, the other options are not suitable for safe and responsible disposal practices. Using the media in agronomic applications immediately may not be feasible or safe if it is contaminated and could lead to further environmental issues. Accepting only anaerobic conditions for disposal is a misinterpretation of proper practices, as aerobic treatment is often required for effective waste management. Lastly, failing to notify local authorities when disposing of contaminated materials is contrary to regulatory requirements, which aim to ensure that such activities are monitored and assessed to prevent environmental harm.