What is a key requirement for discharge from the site according to SWPPP regulations?

The key requirement for discharge from the site according to Stormwater Pollution Prevention Plan (SWPPP) regulations is that discharges must meet applicable water quality standards. This is essential because adherence to water quality standards helps to protect the environment and public health by ensuring that stormwater runoff does not contain harmful pollutants that could degrade the quality of natural water bodies. Meeting these standards is crucial for compliance with the Clean Water Act and other environmental regulations, which are designed to safeguard aquatic ecosystems and drinking water sources from contamination.

Other options do not align with the main focus of SWPPP regulations. For example, frequent discharges are not a requirement; rather, the emphasis is on the quality of those discharges. Untreated discharges are typically prohibited under these regulations, as allowing untreated stormwater to leave a site could introduce pollutants into nearby water bodies. Lastly, the timing of discharges, such as whether they occur during day or night, is not a central concern of SWPPP but rather the quality of the discharged water.