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... 0700-1900 hours on normal weekdays. For all other time periods, Leq(15 min) as three consecutive Leq(5 min) results shall be employed for comparison with the NCO criteria. 3.2.2 As supplementary information for data auditing, statistical results such as L10, L90 and Lmax shall also be obtained for reference. Lmax levels are only measured during operation/maintenance monitoring. A sample data record sheet is shown in Figure 3.1 for reference. 3.3 Monitoring Equipment 3.3.1 As referred to in the Technical Memorandum (TM) issued under the Noise Control Ordinance (NCO), sound level meters in compliance with the International Electrotechnical Commission Publications 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications shall be used for carrying out the noise monitoring. Immediately prior to and following each noise measurement, the accuracy of the sound level meter shall be checked using an acoustic calibrator generating a known sound pressure level at a known frequency. Measurements may be accepted ...