Reference Document MCU22-0102 Updated Environmental Noise Assessment (2)

                                Table 3.1: EPP (Noise) Acoustic Quality Objectives

                                                         Acoustic Quality Objectives at Noise
                                                             Sensitive Receptors, dB(A)                      Environmental
Sensitive Receptor                 Time of Day
                                                                                                                 Values
                                                        LAeq, adj, 1hr   LA10, adj, 1hr      LA1, adj, 1hr

                        Daytime 7am to 6pm & Evening                                                           Health &
Dwelling Outdoors                                            50               55                 65
                        6pm to 10pm                                                                            wellbeing
                        Daytime 7am to 6pm & Evening                                                           Health &
Dwelling Indoors                                             35               40                 45
                        6pm to 10pm                                                                            wellbeing
                                                                                                                Health &
                                                                                                              wellbeing in
Dwelling Indoors        Night time 10pm to 7am               30               35                 40
                                                                                                             relation to the
                                                                                                             ability to sleep

Table 3.2 shows the adjustments that are to be added to the measured noise levels at a receptor
location to derive the adjusted level (adj) if the noise is subjectively assessed to be tonal or
impulsive in character.

                        Table 3.2: Noise Character Adjustments at Sensitive Receptors


Noise Characteristic                                                     Adjustment to Noise Level



Tonal characteristic is just audible                                                      +2dB(A)


Tonal characteristic is clearly audible                                                   +5dB(A)


Impulsive characteristic is just audible                                                  +2dB(A)


Impulsive characteristic is clearly audible                                               +5dB(A)




3.1.2       Background Creep
Background creep is defined as the cumulative increase in minimum noise levels generated by
continuously operating noise sources. Controlling background creep seeks to avoid intrusiveness.
To the extent that it is reasonable to do so, noise from an activity must not be:
    ➢ For noise that is continuous, the noise must not be greater than the existing acoustic
      environment; or
    ➢ For noise that varies over time, the noise must not be more than 5 dB(A) greater than the
      existing acoustic environment.
The EPP (Noise) does not define “continuous noise” but by definition, “continuous noise” would be
required to occur for at least 90% of the measurement period (typically 15 minutes or 60 minutes).



Ref: 21030929 - 01b                                                                                             Page 14 of 28