What is the primary consideration for sizing a subsurface seepage system for Class I effluent?

When sizing a subsurface seepage system for Class I effluent, the sizing must ensure that the system can adequately manage the volume and characteristics of the wastewater being treated. According to the guidelines, the size of the system should be at least two-thirds of the calculated necessity because this standard helps ensure that there is sufficient capacity to handle fluctuations in effluent volume and maintain proper treatment over time.

Maintaining at least two-thirds of the calculated necessity helps prevent issues such as system overloading, which could lead to failure in treating the effluent appropriately and potential environmental contamination. This consideration is crucial for both the efficiency of the septic system and the protection of surrounding water sources. Adequate sizing enables the system to disperse the effluent into the soil effectively, allowing for adequate treatment processes to occur, thus ensuring compliance with health and safety regulations.

In contrast, factors like system complexity, soil type, and water volume are secondary considerations that influence performance but do not directly dictate the baseline size requirement set by regulatory standards.