After the Long-Term 2 Surface Water Treatment Rule testing, a system is put into a ________, which are ______ concentrations in the source water for the theoretical potential for contamination.

After the Long-Term 2 Surface Water Treatment Rule testing, a system is put into a ________, which are ______ concentrations in the source water for the theoretical potential for contamination.

• A. pack, minimum
• B. pack, average
• C. bin, minimum
• D. bin, average

Answer: (D)

The concept being tested is how LT2 testing uses a bin system to categorize a water system based on the average amount of contaminants in the source water. After testing, a system is placed into a bin that represents the average concentrations observed in the source water, not just a single sample. This bin reflects the theoretical potential for contamination and then determines what additional treatment is required to ensure protection from pathogens. Using the average concentration focuses on the typical contamination level over the testing period, guiding the appropriate level of disinfection or filtration enhancement.

The concept being tested is how LT2 testing uses a bin system to categorize a water system based on the average amount of contaminants in the source water. After testing, a system is placed into a bin that represents the average concentrations observed in the source water, not just a single sample. This bin reflects the theoretical potential for contamination and then determines what additional treatment is required to ensure protection from pathogens. Using the average concentration focuses on the typical contamination level over the testing period, guiding the appropriate level of disinfection or filtration enhancement.