J Acoustic Report · 132007.2398

                                                                                              ACOUSTICS & AIR QUALITY

Table ‎5.3 Daily Statistical Noise Levels at Location A

     Day                                               Noise Levels dBA
                                                              Maximum Leq (1
                     Leq            L10          L10              hour)                 L90             L90

                  (24 hour)     (18 hour)     (12 hour)       Day         Night      (8 hour)      (18 hour)
 Wednesday
                     53             55           56           58           56           35              43
 12/11/14
  Thursday
                     53             55           56           56           55           37              43
 13/11/14
    Friday
                     53             56           57           56           56           38              46
 14/11/14
  Saturday
                     53             56           57           57           54           43              45
 15/11/14
   Sunday
                     52             56           57           56           52           42              44
 16/11/14
   Monday
                     53             56           57           58           54           39              44
 17/11/14
  Tuesday
                     55             57           58           63           56           41              44
 18/11/14
  Average            53             56           57           58           55           39              44

The background noise levels calculated using the lowest 10th percentile method are shown in
Table 5.4.


Table 5.4 Background Noise Levels at Location A

                     Period                                  Background Noise Level L90 dBA
              Day (7am to 6pm)                                              42
            Evening (6pm to 10pm)                                  30 (taken less insects)
             Night (10pm to 7am)                                   23 (taken less insects)


The single event maximum rail noise level at the monitoring location is determined as the
average of the noisiest 15 rail noise levels during any 24 hour period. The rail noise level has
been calculated using the average of the noisiest Lmax,15min values in each 24 hour period, with
the overall single event maximum rail noise level being taken as the median daily value. The
results are shown in Table 5.5.




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