What was the purpose of Phase II regulations introduced in December 1999?

The purpose of the Phase II regulations, introduced in December 1999, was to specifically address the control of pollutants in stormwater runoff from construction sites that disturbed between 1 and 5 acres. This regulation expanded the requirements of the National Pollutant Discharge Elimination System (NPDES) to include smaller construction sites that previously had been exempt from such regulations. By doing so, the aim was to reduce the amount of sediment and other pollutants that could be discharged into waterways from these smaller sites, which is important for protecting water quality and aquatic ecosystems.

The expansion of these regulations reflects a broader approach to stormwater management, recognizing that even smaller developments can contribute significantly to water pollution if not properly managed. Thus, the focus is not solely on larger sites but includes those in the specified range, ensuring that effective erosion and sediment controls are implemented across a wider array of construction activities.