Georgia Residential Contractor Practice Exam 2025 - Free Residential Contractor Practice Questions and Study Guide

The correct choice indicates that a minimum of 6 inches of cover is required over a septic tank once it is installed. This amount of cover is essential for several reasons. First, it provides adequate protection for the tank from surface loads, such as pedestrian or vehicle traffic, ensuring that the structural integrity of the tank is maintained over time.

Additionally, this depth of cover allows for proper insulation and helps to minimize the potential for freezing in colder climates, which could impede the functionality of the septic system. It also aids in maintaining the soil's natural drainage and helps to prevent the surface runoff from infiltrating the tank area, which can lead to contamination of the groundwater.

In contrast, a cover depth that is too shallow may not provide enough protection against these factors, while a depth that is excessively deep can potentially complicate maintenance access and may hinder the operation of the system. Therefore, the 6-inch requirement strikes a balance between protection and practicality, making it the recommended standard for septic tank installations.