How should plastic distribution boxes be placed?

Placing plastic distribution boxes on a tamped sand or gravel base is important for several reasons. A properly prepared base ensures stability and adequate support for the boxes, preventing them from shifting or settling over time. This stability is crucial to maintain the integrity of the septic system and to ensure the effective distribution of effluent into the drain field.

Using a tamped sand or gravel base allows for proper drainage while providing a level surface, which helps prevent potential issues related to water pooling or uneven loading. This base material also promotes aeration and helps minimize the risk of root intrusion, which can interfere with the functionality of the distribution boxes.

In contrast, placing the boxes on bare earth might lead to instability as the soil can shift with moisture changes. Old concrete slabs may not provide the necessary drainage and can lead to water backing up if not properly sloped. Loose soil is also inappropriate as it does not offer adequate support and can easily compact under weight, causing the distribution boxes to become misaligned. Overall, a tamped sand or gravel base is the best practice for ensuring optimal performance and longevity of the septic system.