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

 Parameter                 Statistic                            Noise Levels dBA

                           (Median)               53           47                       45
                           Bottom 10%             51           45                       43
                           Minimum                48           44                       41
 Leq                       Maximum                60           61                       57
                           Top 10%                54           53                       51
                           Average                52           48                       45
                           (Median)               52           46                       43
                           Bottom 10%             49           44                       41
                           Minimum                46           42                       40
 L90                       Maximum                54           57                       53
                           Top 10%                52           52                       49
                           Average                49           46                       42
                           (Median)               49           44                       41
                           Bottom 10%             45           42                       39
                           Minimum                42           40                       37

The background noise levels calculated using the lowest 10th percentile method are shown in Table 5.3.
Rainfall affected noise data has been excluded from this analysis.

Table 5.3 Background Noise Levels at Location A

                                                       Background Noise Level L90 dBA
                  Period
                                        Overall                          Less Insects
          Day (7am to 6pm)              45                               38
       Evening (6pm to 10pm)            42                               38
         Night (10pm to 7am)            39                               34

From the above results and observations the following comments are made:
    Extraneous noise from insects dominated attended measurements and logging data. It is expected
     that insects are seasonal and tend to be present in warmer months. During cooler periods of the
     year, insect noise is expected to be significantly reduced. Background noise levels in the quieter
     periods of the year have been estimated by removing the high frequency (8kHz and 16kHz octave
     bands) insect noise from the analysis of background noise levels.
    Rainfall was recorded on the morning of Tuesday 20th between the hours of 12:45am and 9:00am
     and appears to have affected the noise levels. The noise affected data has been removed from the
     determination of background noise levels.




8816R01V01.docx                                                                                      14