What is the main benefit of installing automatic samplers upstream and downstream of suspected dischargers?

The main benefit of installing automatic samplers upstream and downstream of suspected dischargers is to document all possible sources of contamination. By placing samplers at these strategic locations, it becomes possible to effectively monitor and analyze the quality of water before and after it passes through the suspected discharge area. This comparative analysis helps in identifying the specific contributions of various dischargers, thereby providing clear evidence of contamination sources.

Understanding the water quality changes between the upstream and downstream locations is crucial for compliance monitoring and regulatory purposes. It allows environmental professionals to pinpoint which discharge sources may be contributing to pollution, ensuring that appropriate measures can be taken to address any issues. This continuous and systematic approach to sampling enhances overall environmental protection and can guide enforcement actions when necessary.

In contrast, while redundancy in sampling and a steady flow of samples have their advantages, they do not directly facilitate the identification of contamination sources. The speed of manual samplings is less relevant in this context, as the primary aim is to gather data for monitoring and compliance rather than simply expediting the sampling process.