Which of the following is NOT a requirement for a standard drainfield?

A standard drainfield is designed with specific requirements to ensure proper wastewater treatment and prevent environmental contamination. One of the key requirements is that the drainfield must adhere to certain dimensions and spacing guidelines to function effectively.

The statement that a drainfield can be of any width is incorrect because drainfields must conform to specified widths as part of regulations to ensure that they can effectively handle and treat wastewater. Without adherence to these width requirements, the drainfield may not be able to properly manage the flow of effluent, which could lead to system failure or environmental harm.

In contrast, the other requirements, such as excavation being level, maintaining a certain distance between drainfields, and adhering to material size in porous media, are all critical components that help ensure that the system functions correctly and efficiently. Level excavation ensures uniform distribution of effluent, while proper spacing and material size help maintain hydraulic performance and provide adequate treatment.