For the purposes of this subsection, all distances shall be measured from the outer limit of the active hazardous waste management area. "Substantial modification" includes: any physical change in, change in the operations of, or addition to a facility which could increase the potential offsite impact, or risk of impact, from a release at that facility; and any change in permit conditions which is reasonably expected to lead to greater potential impacts or risks of impacts, from a release at that facility. "Substantial modification" does not include a change in operations, structures, or permit conditions which does not substantially increase either the potential impact from, or the risk of, a release. Physical or operational changes to a facility related solely to the management of nonhazardous waste at the facility is not considered a substantial modification. The department shall, by rule, adopt criteria to determine whether a facility has been substantially modified. "Initial operation" means the initial commencement of operations at the facility.
Fla. Stat. § 403.7211