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ANALYSIS: Staffs position is that the airport noise impact zone boundaries not be changed because: there is no technical information available to justify a change a change in the noise impact zone boundary would not affect existing residences When the County enacted its airport zoning regulations several years ago, the airport noise impact zone boundaries were established The zone boundaries were set based on federal FAA requirements for airports, bice the Vero Beach Airport, which have not conducted a Part 150 noise study. Since the noise impact boundaries were established using acceptable FAA methodology, those boundaries could be changed only by applying the same methodology or based on the results of a Part 150 study. Because a Part 150 study has not yet been undertaken for the Vero Beach Airport, staffs position is that no technical data are available to change the existing noise impact zone boundaries. Regardless of the location of the airport noise impact zone boundary, it is important to consider the regulation effect of the noise impact zone. As adopted, the County's airport zoning provisions, Section 911.17 of the County's I:.DRs, regulate only new construction within the noise impact zone. The noise zone boundaries do not affect existing development. Within noire impact zones, certain uses are permitted, some are allowed with conditions, and some are prohibited. Among those uses which are allowed with conditions are residential developments. For residential development within noise impact zones, the conditions are that residential structures be constructed so that the structures meet established noise level reduction standards (these standards are met by residential construction throughout the County because of existing building/energy code requirements), or alternatively (instead of meeting noise level reduction standards) a property owner may execute an avigation easement to the airport, acknowledging that the airport will continue to produce noise and not be a nuisance. As indicated above, there is no technical information which would justify changing the existing Vero Beach airport noise impact zone boundary. Also, changing the boundary would not have any effect on existing residences within a noise impact zone. For those reasons, staff recommends that no action be taken by the Board of County Commissioners regarding the County's airport noise impact zone boundaries. RECOMMENDATION: Staff recommends that no action be taken on the County's airport noise impact zone boundaries. October 17, 2000 52