The amount of DERs shall be the difference between:

1. (a) The amount of VOC or NOx emissions that would have been emitted from the source during the generation period calculated by multiplying the actual activity levels during that period by the lower of:

   1. (1) The lowest applicable allowable emissions rate; or
   2. (2) The actual emissions rate that would have been emitted based on normal source operation; and
2. (b) The amount of actual emissions during the generation period based on actual activity levels during that period.

Source. #6441, EXEMPT, eff 1-21-97