1This Part sets forth additional requirements for certain Department permits, exemptions from permitting, requirements for mixing zones and zones of discharge, and related requirements. Except as otherwise provided in Chapter 62-330, F.A.C., or in the rules adopted by reference thereunder, this Part shall not apply to activities regulated under Part IV of Chapter 373, F.S. However, this Part shall continue to apply to those activities grandfathered under Sections 69373.4131(4), 70373.414(11), 71(12)(a), (13), (14), (15), (16) and 77373.4145(6), F.S.