Copies of the advisory circular and the determinations on noise level of aircraft made by the airport director pursuant to Section 12.88.530 or 12.88.540 of this chapter shall be maintained in the Sacramento County department of airport offices located at the airport and shall be supplied to the Federal Aviation Administration tower operators at the airport. A general summary of the airport noise standards shall be posted at five prominent locations at the airport. (Prior code § 4.04.112)