RFI - 7. Accoustic

6.2.2   Background Creep
The Background Creep criteria are as follows;

        Time-varying noise:
                                  LAeq,adj,T, ≤ Ambient LA90,T + 5dB(A)

        Steady-state noise:
                                         LA90,T ≤ Ambient LA90,T

The time period (T) is a time interval of at least 15 minutes, or if the noise continues for less than
15 minutes, the duration of the noise source.

Based on the results of ambient noise monitoring, the project specific background creep noise limits
are shown in Table 6.

                                   Table 5: Background Creep Noise Limits

                                                       Noise Level Limits SPL dBA
                               Time Period
                                                         LAeq,T             LA90,T
                              Day 7am – 6pm               60                 55
                          Evening 6pm – 10pm              51                 47
                            Night 10pm – 7am              47                 42




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