The EPA found that construction site runoff is typically how many times greater than that from agricultural land?

The correct information indicates that construction site runoff is frequently cited as being significantly more polluted compared to the runoff from agricultural land. Studies conducted by the Environmental Protection Agency (EPA) have shown that the sediment and pollutant levels found in runoff from construction sites can be as much as 10 to 20 times greater than those from agricultural lands.

This substantial difference is primarily due to the nature of construction activities, which often disturb the soil and expose loose sediments, making them more susceptible to erosion during rainfall events. Additionally, construction sites are more likely to have various contaminants such as oils, fuels, and heavy metals from machinery and materials, which contribute to the increased pollution levels in the runoff.

Understanding this stark contrast highlights the need for effective erosion and sediment control practices on construction sites to mitigate environmental impact, underscoring the importance of regulations and best management practices within the construction industry.