Georgia Septic Installer Practice Test

What material is defined as washed gravel or washed stone that meets DOT standards and ranges from 1/2 inch to 2 inches in diameter?

1. Aggregate

2. Black water

3. Percolation rate

4. Distribution device

The correct answer is: Aggregate

The material defined as washed gravel or washed stone that meets DOT standards and ranges from 1/2 inch to 2 inches in diameter is referred to as aggregate. Aggregate is commonly used in construction and septic system applications due to its properties that enhance drainage and provide stability. In the context of septic systems, aggregate serves as a key component in the installation of leach fields, ensuring that effluent is properly distributed and filtered before it reaches the soil. Understanding the characteristics of aggregate is crucial for septic installers, as the quality, size, and type of aggregate can significantly influence the efficacy of a septic system. The specific size range mentioned (1/2 inch to 2 inches) ensures that the material is suitable for allowing adequate water flow while also preventing the clogging of the system. The other options, while related to wastewater management, do not accurately describe the material in question. Black water refers to wastewater that contains human waste, percolation rate is a measure of how quickly water infiltrates the soil, and distribution devices are components of the septic system that direct effluent to various parts of the leach field. Only aggregate directly corresponds to the description provided in the question.