080620 FINAL PN 2896 eReport June 08 V1.pdf [As Published] · 132008.1128

                                                                                              SUNRISE BEACH RETIREMENT VILLAGE
                                                                                                GRASSTREE COURT, SUNRISE BEACH
                                                                                                       NOISE IMPACT ASSESSMENT

                                           Table 5: Noise Impact Assessment Criteria
                Time                           Noise Sensitive Place               Limit (Refer Section 3)
                7am – 6pm                      LAmax adj <= L Agb + 5 dB              38 dB(A) + 5dB
                6pm – 10pm                     LAmax adj <= L Agb + 5 dB              35 dB(A) + 5dB
                10pm – 7am                     LAm ax adj <= LAgb + 3dB               31 dB(A) + 3dB



              The Environment Protection Regulations (1998) presents offence limits for mechanical plant
              noise emissions. This mechanical plant includes refrigeration equipment and air conditioning
              equipment. The offence limits are shown in Table 6 and the derived limits are shown in Table
              7.

                                         Table 6: Offence noise limits at a noise sensitive place
                Period                          Noise level at noise sensitive place measured as the adjusted
                                                        maximum sound pressure level (L Amax,adj,T14 )

                6 am – 6 pm                 LAmax,adj,T not greater than 50 dB(A)
                6 pm – 10 pm                LAmax,adj,T not greater than 50 dB(A)
                10 pm – 6 am                LAmax,adj,T not greater than the higher of:
                                                      40 dB(A) or
                                                      Background noise level plus 5 dB(A).


                                   Table 7: Derived noise limits at a noise sensitive place
                       Period                                          Noise Limit
                6 am – 6 pm                 43 dB(A)
                6 pm – 10 pm                40 dB(A)
                10 pm – 6 am                34 dB(A)



5.2           Assessment

              To comply with these limits, there are a number of engineering solutions available. Low
              noise levels are achieved by the engineered selection and application of:

               Low sound power level equipment
               Silencers
               Acoustic enclosures
               Noise barriers
               Vibration isolation systems


              The application of such principles and treatments, along with providing maximum separation
              distances between noise sources and sensitive areas will ensure that noise from plant and
              equipment complies with limits.

              For noise sensitive places within the development noise impacts from mechanical plant
              should be engineered not to exceed 40 dB(A) when measured inside apartments.


14   LAma x,a dj,T is obtained by making adjustments for tonality and impulsiveness as specified in AS1055

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