Acoustic Report · MCU15/0122

Proposed Medical Centre, Noosaville


                     Table 2 Logger Noise Measurement Results

                                                         Measured Ambient Sound Levels, dB
                                                Day                        Evening               Night
                                         LA10         LA90 Ʌ         LA10        LA90 Ʌ   LA10           LA90 Ʌ
                      1-Sep-15            56           40             46             32    50             32
                      2-Sep-15            56           39             45             31    50             29
                      3-Sep-15            58           46             45             28    50             30
                      4-Sep-15            57           43             47             32    50             31
                      5-Sep-15            56           40             48             33    49             32
                      6-Sep-15            55           39             45             30    50             31
                      7-Sep-15            57           39             44             29    50             30
                      8-Sep-15            58           46
                      Average          55            39            44           29          49          29
                     Notes: Ʌ The LA90 is the lowest 10th percentile of the LA90(15-minute) measurements for the
                     respective time period.

                     Note that the daytime noise levels are dominated by road traffic noise from
                     Goodchap Street. Therefore, it is considered to be appropriate to reduce the LA90
                     measured during the day by 3 dB(A) for assessment purposes at residences on
                     the western side of Goodchap Street due to the further distance of these
                     residences from the noise source.
                     The daytime LA90 for assessment purposes for residences on the western side of
                     Goodchap Street is therefore: 39 dB(A) – 3 dB(A) = 36 dB(A).


4 Predicted Noise Levels and Attenuation

                     4.1     Vehicle Noise

                     4.1.1    Carpark Noise
                     Previous noise measurements carried out by RoadPro Acoustics of vehicles
                     driving in car parks have shown noise levels in the order of 60-65 dB(A) at a
                     distance of 10 m are produced.
                     The lower level carpark is enclosed, preventing noise emissions from impacting
                     on residences in Val Crescent. The wall material for the carpark will be minimum
                     Rw 25, and the roof material (where this function isn’t served by the soffit) will be
                     colourbond steel sheeting.
                     The nearest residence to the north of the site (on the opposite side of Goodchap
                     Street) will be approximately 20 m from the driveway ramp on that side of the
                     development. The resultant short-term noise levels from vehicles on the site would
                     be approximately 55-60 dB(A) without any additional noise attenuation. The
                     LAeq,1 hr will be lower than this level depending on how frequently vehicles use the
                     ramp, however it is uncertain by how much. A minimum 1 m high acoustic barrier
                     has been designed to run along the northern edge of the carpark and ramp,
                     accompanied by acoustically absorptive surface treatment on the inside of the
                     barrier and on the building wall adjacent to the driveway. This will ensure
                     effectiveness of the barrier by reducing noise reflections, as well as reducing the
                     noise that generally emanates from the site.




www.roadpro.net.au                                          5 November 2015                                        Page 5 of 8