If the airport director determines, based on the noise data received pursuant to Section 12.88.530 of this chapter or ascertained by measurement or data obtained pursuant to Section 12.88.510 of this chapter, that the aircraft noise level exceeds a standard at take-off of 84.0 EPNdB, then it is unlawful and a misdemeanor for a person to take-off or land such an aircraft at the airport. Notice of the airport director's determination pursuant to Section 12.88.530 or 12.88.540 of this chapter shall be given in writing to the persons who base a model of the aircraft at the airport which the airport director has determined exceeds a noise level at take-off of 84.0 EPNdB. Such determinations by the airport director shall also be post-ed in five prominent locations at the airport. (Prior code § 4.04.105)