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critical flood zone or coastal high hazard areas. Flood hazard zones, critical flood zones, coastal high hazard areas and flood elevation data may be identified through flood hazard studies and delineated on the flood insurance rate maps (FIRM) published by the Federal E mergency Management Agency. Copies of the FIRM and supporting data are incorporated by reference into this chapter. As new or better information becomes available, this chapter will be amended to incorporate new maps and flood elevations and other data. Current maps and supporting information are available for- — -- inspection ed at the Indian River County Administration Building, Community D evelopment Department. 1840 25th Strcct Vcro Bcach, F. 32960- (t) Provisions applying to re -development of existing development. 2..Developers of a Al4aidies currently developed site, required for any reason to get a major site plan approval, or maior modification of an existing land development permit, must demonstrate that the site has or will have a stormwater management system conforming to section 930.07(1)(a) and will shalt meet the water quality level of service as required in section 930.07(1) for the area being re -developed. S tormwater treatment shall be provided for the increase of all proposed new impervious area and 50% of the site's impervious .area for which no runoff treatment has been previously provided. D evelopers of a currently developed site, required for any reason to get a minor site plan or administrative approval, must provide stormwater treatment for the first inch of runoff for the area being re- developed. The Public Works Director may modify this requirement based on site or design characteristics. All sites being re developed and required to obtain major site plan approval, or modification of an service as required in section 930.07(1)(c) for the or a being rc developed. Section 930.07, Review criteria for all development projects, sections (2)(h).1 and .2, are amended to read as follows: [(2)[(h) If any lot in a residential subdivision lies within a flood hazard zone, then the following additional standards apply to approval of the preliminary and/or final plat, as applicable: 1. Each lot depicted on a preliminary and final plat must include a site suitable for constructing a residential building in conformity with the standards of this chapter. 2. Two (2) One (1) or more elevation benchmarks must be established on actual exterior plat corners and indicated on the final plat. Said elevations must be referenced to the NGVD (1929) or current datum 8