74:36:21:13.  Calculate a 30-day rolling average. The following procedures shall be used to calculate a 30-day rolling average:

          (1)  Sum the total pounds of pollutant in question emitted from a unit during an operating day and the previous 29 operating days;

          (2)  Sum the total heat input to the unit in million Btus during the operating day and the previous 29 operating days;

          (3)  Sum the total hours the unit operated in hours during the day and the previous 29 operating days;

          (4)  For pounds per million Btus, divide the total number of pounds of the pollutant emitted during the 30-day operating days by the total heat input during the 30-day operating days;

          (5)  For pounds per hour, divide the total number of pounds of the pollutant emitted during the 30-day operating days by the total hours operated during the 30-day operating days.

          A new 30-day rolling average shall be calculated for each new operating day. Each 30-day rolling average shall represent all emissions, including emissions that occur during periods of startup, shut down, and malfunction.

          Source: 46 SDR 64, effective November 25, 2019.

          General Authority: SDCL 34A-1-6.

          Law Implemented: SDCL 34A-1-6.