What are the requirements for satisfactory fill soils in a DIS?

Satisfactory fill soils in a septic system installation (DIS) are crucial for ensuring proper functioning and longevity of the system. The correct choice indicates that a maximum of 2 feet of fill soil can be utilized, but this is coupled with specific testing requirements. This is important because the structural integrity and performance of the septic system rely heavily on the properties of the fill soil.

Using fill soils necessitates an understanding of their characteristics, such as permeability and compaction, which can directly impact the treatment and dispersal of effluent from the septic system. The requirement for testing ensures that the fill soils meet the necessary criteria for effective drainage and do not lead to issues such as ponding or groundwater contamination.

In contrast, indicating that satisfactory soil must be at least 2 feet above bedrock does not specifically address the suitability of fill soils, which can vary widely in terms of their physical properties and suitability for septic systems. The option stating that fill soils must not be used in any system is overly restrictive and does not reflect the practical use of fill in many installations. Lastly, specifying a minimum of 1 foot of fill soil does not address the maximum limit or the need for testing, therefore not adequately ensuring the functionality of the system.

Overall, the