Which WAC code specifies the vertical separation requirements for mound systems?

The correct choice indicates the WAC code that outlines the vertical separation requirements for mound septic systems. Specifically, WAC 246-272A-0230 provides essential guidelines regarding the minimum vertical separation distances necessary between the bottom of the mound system and underlying materials, such as groundwater or restrictive layers.

This separation is crucial in preventing groundwater contamination and ensuring the effective functioning of the septic system. Adhering to these vertical separation requirements helps in maintaining environmental safety and overall system efficacy. Understanding and applying these regulations are fundamental for septic system installers to ensure compliance and protect public health.