Figure: 30 TAC §117.1205(d)

The equation for calculating the rolling 24-hour average nitrogen oxides emission specifications for utility boilers or auxiliary steam boilers firing a mixture of natural gas and fuel oil.

Where:

     EL = emission specification (heat input weighted average) on a rolling 24-hour average basis;

     a = the percentage of total heat input from natural gas; and

     b = the percentage of total heat input from fuel oil.