True or False: The recommended backfill over the absorption field is generally 8-12 inches.

The recommended backfill over the absorption field being generally 8-12 inches is correct because proper backfill depth is crucial for the functionality and longevity of the absorption field, which is a critical component of on-site wastewater treatment systems. This specified range helps ensure that the absorption field is adequately covered to promote effective drainage, prevent surface water intrusion, and protect the field from mechanical damage.

A depth of 8-12 inches allows for sufficient soil to provide insulation against temperature fluctuations and to support healthy microbial activity, which is essential for breaking down and treating wastewater. This backfill also helps to maintain oxygen levels in the soil, further promoting the aerobic processes necessary for effective filtration and treatment of effluent.

In contrast, other factors like regional soil types and climate might influence specific recommendations, but the 8-12 inch depth serves as a guideline applicable in various locations to ensure consistent performance of the absorption systems. This can be vital as too little backfill may expose the field, while too much can create compaction issues and hinder water movement through the soil.