Which of the following is NOT an option for protecting a catch basin inlet during loading and unloading operations?

During loading and unloading operations, protecting a catch basin inlet is essential to prevent contaminants from entering the stormwater drainage system. Leaving the inlet open is not a viable option for protection because it exposes the basin to potential spillage and runoff during these operations. Open inlets could allow hazardous materials, pollutants, or sediments to flow directly into the drainage system, which can lead to environmental contamination and regulatory issues.

On the other hand, covering the catch basin inlet provides a physical barrier that prevents debris and contaminants from entering. Placing absorbent materials around the inlet enhances protection further by soaking up any spills or leaks before they can reach the basin. Also, closing a shutoff valve, if applicable, can help control outflow and prevent contaminated water from escaping into the drainage system during the activity. Therefore, leaving the inlet open is the least responsible choice to protect the catch basin during loading and unloading operations.