Stage 2 DBPR compliance is evaluated at each monitoring location using which metric?

Stage 2 DBPR compliance is evaluated at each monitoring location using which metric?

• A. Quarterly median
• B. Running annual average
• C. Daily instantaneous reading
• D. Monthly maximum

Answer: (B)

Stage 2 DBPR uses the locational running annual average at each monitoring location to evaluate compliance. This means the average of the DBP concentrations from the most recent 12 months of monthly samples at that specific site, updated every month, is compared to the regulatory limit for that location. This approach accounts for variability in DBP levels within the distribution system. The other options aren’t used for compliance calculations: it’s not a quarterly median, not a daily instantaneous reading, and not a monthly maximum.

Stage 2 DBPR uses the locational running annual average at each monitoring location to evaluate compliance. This means the average of the DBP concentrations from the most recent 12 months of monthly samples at that specific site, updated every month, is compared to the regulatory limit for that location. This approach accounts for variability in DBP levels within the distribution system. The other options aren’t used for compliance calculations: it’s not a quarterly median, not a daily instantaneous reading, and not a monthly maximum.