Appendix J - Peabody Energy

Table 27 Predicted Distance Required to Achieve Blast Emission Criteria
Period Airblast Distance Vibration Distance
Daytime 115 dBLpk 155 m 5 mm/s 180 m
Evening 105 dBLpk 140 m 2 mm/s 320 m
Night-time 95 dBLpk 360 m 1 m/s 500 m
Based on the foregoing, airblast emissions arising from underground excavation blasting are
predicted to meet the most stringent night-time criteria of 95 dBLpk at a distance of 360 m from
the nearest ventilation shaft. As there are no residential dwellings located within 360 m from the
proposed Ventilation Shaft No 4, airblast noise impacts are likely to be minimal (which is
consistent with the with existing Metropolitan Colliery excavation blasting practices).
Similarly, ground vibration levels are predicted to meet the most stringent night-time criteria of
1 mm/s at a distance of 500 m from the blast site. As all excavation blasting is conducted at least
400 m below the surface, vibration impacts are also likely to be minimal (which is also consistent
with the existing Metropolitan Colliery excavation blasting practices and experience).
11 OFF-SITE TRANSPORT
11.1 Road Transport
Traffic Noise Criteria
Based on the ECRTN dated May 1999, Lawrence Hargrave Drive is classified as a “sub-arterial
road” and Parkes Street as a “collector”, road. The applicable noise criteria are presented in
Table 28.
The traffic noise monitoring was conducted to establish the existing traffic noise environment
inclusive of the existing Metropolitan Colliery operations and summarised in Section 4.4. The
existing total traffic noise levels generally already exceed the relevant criteria at nominal off-set
distance of 30 m from Lawrence Hargrave Drive and 15 m from Parkes Street, Helensburgh.
Table 28 NSW Environmental Criteria for Road Traffic Noise
Receiver Area Road Policy Descriptor 1 Traffic Noise Goal
(dBA)
Helensburgh
Note 1:
Lawrence
Hargrave Drive
Parkes Street
Land use developments with
the potential to create
additional traffic existing on
sub-arterials
Land use developments with
the potential to create
additional traffic existing on
collector roads
Daytime 0700 hours to 2200 hours, Night-time 2200 hours to 0700 hours.
Daytime
LAeq(15hour)
Night-time
LAeq(9hour)
Daytime
LAeq(1hour)
Night-time
LAeq(1hour)
Note that in all cases where the nominated criteria are already exceeded, traffic associated with
new development should not be permitted to lead to an increase in the existing noise traffic levels
of more than 2 dBA. This can be achieved when the Project related percentage increase in
existing light and heavy vehicle movements is no greater than 60%.
60
55
60
55
Heggies Pty Ltd
Report Number 10-5055-R1
Revision 0
Metropolitan Coal Project
Noise Impact Assessment
Helensburgh Coal Pty Ltd
(10-5055R1) 31 July 2008 Page 39