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• Indian River County Page 3 Emergency Permitting Rules & Regulations Significant Adverse Impact — Adverse impacts of such magnitude that they may alter the coastal system by (a) measurably .affecting the existing shoreline change rate, (b) significantly mterfering with its ability to recover from a coastal storm, or (c) disturbing topography or vegetation such that the system becomes unstable, or suffers catastrophic failure. Vulnerable Structure — An eligible structure which, as a result of erosion from a storm event that has been declared an emergency by Indian River County, has fewer than twenty (20) feet of property (buffer zone) between the seaward most edge of the eligible structure and the dune escarpment. The width of the buffer zone shall be subject to change and shall be updated by Indian River County at intervals specified in the HCP. The width of the buffer zone shall be determined using FDEP's High Frequency Dune Erosion Model that calculates dune recession rates based on .a 15- year return interval storm. Vulnerable structures also include eligible structures whose structural foundations have been exposed, as well as eligible structures where shoreline protection measures were initiated under emergency authorization from Indian River County on or before March 30, 1999, but those measures could not be completed due to legal challenges: Rules & Regulations: 1. Permits for emergency shoreline protection shall only be issued to eligible and vulnerable structures. 2. Permits shall not be issued for temporary shoreline protection measures that, in the judgment of the Coastal Engineer, are likely to cause significant adverse impacts nor shall permits be issued when a proposed shoreline protection measure is not for the purpose of alleviating conditions resulting from the shoreline emergency. 3. Protective measures must be limited to one or a combination of the following: a. Placing beach -compatible sand from upland sources on the beach, b. Creatinga temporary barrier seaward of the structure using sand bags and/or geotextile fabrics filled with sand, c. Shoring up (reinforcing) foundations, d. Installing temporary wooden retaming walls, cantilever sheetpile walls (without concrete caps, tie -backs, or other reinforcement), or similar structures seaward of the vulnerable structure. 5. Temporary structures constructed for emergency protection shall be: a. Designed and sited to minimize excavation of the beach and frontal dune as well as impacts to native vegetation, marine turtles and adjacent properties, and b. Designed and sited to facilitate removal. 6. The Coastal Engineer will make a determination as to the most appropriate protective measure(s) for the site, with the goal of providing adequate temporary protection for 3