Why should an inspector first visit the sampling points and collect wastewater samples before entering an industrial facility?

The reason for visiting the sampling points and collecting wastewater samples before entering an industrial facility is to allow the collection of an unbiased wastewater sample. Conducting sampling before entering the facility helps avoid any potential contamination or alteration of the samples that might occur from interacting with the industrial environment. By obtaining samples directly from designated sampling points, inspectors can ensure that the samples represent the true characteristics of the wastewater system, leading to more accurate assessments of the facility’s compliance with environmental regulations.

Other options might suggest various aspects of why sampling is performed, but they do not align with the primary objective of collecting unbiased data. For instance, while ensuring safety gear is worn is important, it does not directly relate to the integrity of the wastewater samples. Similarly, preparing for a visual inspection could be a part of the overall process, but it does not address the critical factor of maintaining sample integrity. Collecting a biased sample would undermine the entire purpose of the sampling process, which is to accurately assess compliance with environmental standards.