07/2398 - Request for information response [As Published] · 132007.2398

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.Leq(24hour) _ the energy average noise level over a 24 hour period;
Maximum Leq(I hour) day the maximum hourly Leq noise level between 6:00am and 10:00pm;
Maximum Leq(Ihour) night — the maximum hourly Leq noise level between 10:00pm and 6:00am.

The maximum Leq(Ihour) night was not recorded and is assumed to be 6 dB(A) below the
Leq(! hour) day, as is standard practice.

4.2 Train Noise Levels

Unattended noise monitoring took place at location NM2 using a calibrated ARL215 noise logger.
The microphone was located |.2 m above ground level. The monitoring period was from noon 8
March 2009 to noon 9 March 2009, although the last 2 hours had to be discarded due to showers.

The noise logger was configured to obtain samples of 15 minutes, including the Lmax, the maximum
noise level. In addition | second samples of noise levels were obtained. This allowed freight train
passes to be identified for sufficiently long trains. Due to the presence of road traffic only one such ‘
train pass could be clearly identified. Other trains did pass, but could not readily be identified. The i:
maximum noise levels did not exceed 80 dB(A), except for the one train pass clearly being able to be ;
identified. The maximum noise level for this pass was 86 dB(A).

Attended noise monitoring was also carried out. Noise levels due to other train passes were
obtained, including octave band spectra. The maximum noise levels for the trains monitored at
location NM2 were 81 dB(A), 75 dB(A) and 80 dB(A). Details are shown in Table 4.2.

Table 4.2 Summary of Passing Train Noise Levels

 

Sample Time Contribution to

 

 

 

 

 

Start Time | Train Type | (@PProximate | 1 upray | Leq dB(A) | Lea(2thour)
time for train dB(A)
to pass)
12:35pm Freight 55 sec 86 77 45
1:05pm Tikt train 25 sec 81 70 35
4:24pm Tit train 16 sec 75 70 32
5:00pm Freight 55 sec 80 74 42

 

 

 

 

 

 

 

In terms of noise modelling a maximum noise level of 83 dB(A) at a distance of 40m has been
assumed with a sound power spectrum as indicated in Table 4.3. This noise level may be considered
to be an upper average maximum noise level due to train passes.

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