What is the minimum storage capacity that all holding tanks must be sized to hold?

The correct answer is that all holding tanks must be sized to hold a minimum of 7 days of wastewater flow. This requirement is in place to ensure that the tanks can adequately manage fluctuations in wastewater generation, providing a safety buffer in case of emergencies, such as equipment failure or periods of high use. Designing holding tanks for 7 days helps to prevent overflow and protects the environment by reducing the risk of contaminating groundwater or surface water. It also allows for effective waste management and ensures compliance with local health regulations, which often dictate holding times to promote public health and safety. This standard is crucial for maintaining proper function and serviceability in wastewater systems.