Georgia Septic Installer Practice Test

What is the maximum earth cover recommended over a distribution box?

1. 10 inches

2. 12 inches

3. 14 inches

4. 16 inches

The correct answer is: 12 inches

The maximum earth cover recommended over a distribution box is 12 inches. This specification is important to ensure proper soil absorption and to avoid excessive weight on the distribution box, which can lead to structural issues or interference with the operation of the septic system. Having 12 inches of cover allows for adequate insulation against seasonal temperature changes, which can affect the biological processes happening in the septic system. This depth helps to protect the distribution box from frost during cold months while still being shallow enough to allow air and microbial activity necessary for the system's function. While greater depths might seem beneficial for insulation, excessive earth cover can increase the pressure on the distribution box, risking damage and potential failure of the septic system. Thus, adhering to the recommended maximum of 12 inches ensures both effective performance and longevity of the installation.