What is the minimum separation required from the trench bottom or groundwater table?

The minimum separation required from the trench bottom or groundwater table is 24 inches above the seasonal high groundwater table. This distance is crucial to prevent contamination of groundwater and to ensure that any effluent from the trench does not seep into the groundwater. Maintaining this separation helps protect public health and the environment by minimizing the risk of groundwater pollution.

This 24-inch requirement typically ensures that the soil filtration process can adequately treat wastewater before it reaches the groundwater, providing an essential barrier that enhances safety and effectiveness in sewage management. Additionally, having the separation above the seasonal high groundwater table accounts for fluctuations due to seasonal rains or melting snow, ensuring that the trench remains functional year-round.