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What is the minimum thickness for the bottom, walls, and lid of a distribution box made of concrete?

  1. 3 inches

  2. 4 inches

  3. 5 inches

  4. 6 inches

The correct answer is: 5 inches

The minimum thickness of 5 inches for the bottom, walls, and lid of a distribution box made of concrete is a standard requirement to ensure structural integrity and durability. This thickness provides adequate strength to withstand the soil pressure, the weight of the concrete itself, and any additional loads from maintenance activities. If the distribution box were to be thinner, it might be prone to cracking, breaking, or deforming under stress. The design specifications are established to ensure that the box can function properly over time without compromising the septic system's efficiency. This thickness is also aligned with industry best practices and regulatory guidelines, ensuring the long-term reliability of the septic system.