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Assuming an average ground elevation of 145 feet above sea level, FM <br /> approval would be required for any structure over 58 feet in height. <br /> The Federal Aviation Administration would make a determination <br /> as to the aeronautical hazard of any proposed structures which intrude <br /> above the imaginary horizontal surface of 203 feet above sea level. <br /> Flashing-red obstruction lights might be required as a precaution for <br /> aircraft safety.t <br />L <br /> Cumulative Impact <br />(7 The cumulative impact would result in additional passenger <br /> demand at the airport. As the case with the proposed project, the - <br /> airport is not capable of meeting the existing demand, and therefore, <br /> the cumulative demand would also not be met. The additional passenger <br /> demand by the cumulative projects would probably be met by alternative <br /> airports or travel methods. <br /> 5.12.3 Mitigation Measures <br />I. No mitigation measures are proposed. <br /> 5.12.4 Significant Environmental Effects <br /> The project will contribute toward increased demand for air <br /> service and parking John Wayne Airport. <br />LA <br /> * Elly Stanson, Federal Aviation Administration, Air Space and <br /> Procedures Branch. <br /> 174