Appendices 6 SMP, 7 Bushfire & 8 Noise impact - Email 3 of 4 - MCU16/0153 & REC16/0041

9.           Mechanical Plant Emissions
9.1          Noise Criteria and Limits
To comply with the Queensland Environmental Protection Act criteria for air‐conditioning equipment, the
noise generated from mechanical plant must not exceed the background noise level by 3 dBA from 10pm to
7am, and 5 dBA from 7am to 10pm.
From the noise logging results the lowest 10% of the background noise levels (L90) have been used to
calculate the mechanical plant noise limits at nearby sensitive receivers and are presented in Table 9.1.

Table 9.1 Mechanical Plant Noise Limits

                                                 Background                            Component ‘Design’
                                                 Noise Level       Measured Limit
       Time Period             Criteria                                                       Limit
                                                                    LAeq,adj,T dBA
                                                   L90 dBA                                LAeq,adj,T dBA

     Day (7am – 6pm)     Background + 5 dBA           38                 43                    41
 Evening (6pm – 10pm)    Background + 5 dBA           38                 43                    41
  Night (10pm – 7am)     Background + 3 dBA           34                 37                    34

From Table 9.1 the measured limits are the resulting noise levels from both mechanical plant and existing
background noise levels, while the component limits are only mechanical plant noise levels.

9.2          Assessment
At this stage the detailed mechanical plant information is still being finalised, and it is recommended that
the plant is selected, designed and located to achieve the component ‘design’ noise limits presented in
Table 9.1. This should be achievable with appropriately selected, located and attenuated mechanical plant.




8816R01V01.docx                                                                                          23