Which factor is least important when selecting an industrial wastewater sampling location?

Selecting an industrial wastewater sampling location is critical for ensuring accurate and representative sampling of the wastewater being discharged. The least important factor among those presented is immediate availability for inspector use. While it's beneficial for inspectors to access sampling locations without delay, this factor does not outweigh the need for a location to be representative of the effluent being sampled.

The significance of a sampling location lies in its ability to capture the true nature of the wastewater, reflecting the quality and characteristics that may impact environmental compliance. A location that is easily accessible might not offer the most representative sample if it does not accurately reflect the discharge from the facility or if it is located in an area that does not consider safety and environmental impact.

Environmental impact is crucial, as a poorly chosen sampling location could lead to results that don't represent the potential effects on surrounding ecosystems. Safety considerations are equally important, since ensuring the safety of personnel during sampling operations is fundamental to maintaining compliance with health regulations. Therefore, while immediate availability can facilitate the sampling process, it does not play a significant role in the overall effectiveness and accuracy of the sampling strategy compared to the other factors.