403.08852 Clarification of requirements under rule 62-302.520(2), F.A.C.—For purposes of rule 62-302.520(2), Florida Administrative Code, new sources of heated water discharges shall include an expansion, modification, alteration, replacement, or repair of an existing source only if that charge increases the potential thermal loading to surface waters of the state by 10 percent or more compared to the potential thermal loading from that source as of August 1972.