What are the reinforcing requirements for the walls and base of a poured in place septic tank?

The correct answer provides the required specifications for the reinforcing materials used in the construction of poured-in-place septic tanks. Specifically, the use of a minimum of 6" x 6" No. 10 gauge welded steel reinforcing wire or an equivalent fibrous reinforcing material ensures that the walls and base of the septic tank have sufficient strength and resistance to cracking or failure under load.

Septic tanks are subjected to various pressures, including the weight of the soil above and the hydraulic load from the sewage. Adequate reinforcement is essential to maintain the structural integrity of the tank over time, especially in changing environmental conditions. The specifications in the correct choice reflect industry standards that are designed to ensure durability and safety.

While other options suggest different sizes or gauges of reinforcing wire or lack specific requirements altogether, the chosen answer aligns best with the established regulations and practices for constructing reliable and compliant septic systems. Using the specified gauge and grid size enhances the load-bearing capacity and overall resilience of the tank against environmental forces.