Georgia Residential Contractor Practice Exam

What is the maximum distance between absorption trenches, center to center?

1. 24 inches

2. 30 inches

3. 36 inches

4. 42 inches

The correct answer is: 36 inches

The maximum distance between absorption trenches, center to center, is 36 inches. This measurement is crucial in the design of septic systems or drain fields, where the primary function is to adequately distribute effluent into the soil for treatment and absorption. The specified 36 inches allows for optimal soil absorption and treatment. Spacing the trenches too far apart could lead to insufficient treatment of the effluent, as it may not have adequate contact with the soil, potentially resulting in groundwater contamination or system failure. This spacing also helps ensure that the surrounding soil has enough time to absorb the wastewater before another cycle begins, which is essential for maintaining the effectiveness of the system. The other options represent distances that are either too close or too far apart, which can compromise system effectiveness or violate health and safety standards. The choice of 36 inches strikes a balance between effective distribution and soil health.