Holroyd to Rookwood Road cable REF - TransGrid

CONSTRUCTION NOISE & VIBRATION Page 15 42.6590.R1:CFCD5
QUALITATIVE ASSESSMENT Rev04
330kV ELECTRICITY CABLE
HOLROYD to ROOKWOOD ROAD January 2012
Table 8: Predicted Noise Levels from Micro Tunnelling
L10 dB(A) re: 20 x 10 -6 Pa
Distance from
Sound Pressure Level
Construction
dB(A)
Activity
(m)
Site
Establishment
Drilling Cable Laying
15 85 87 79
40 76 78 70
80 70 72 64
100 68 70 62
150 65 67 59
300 59 61 53
4.5.2(a) Assessment
The predicted noise levels for the micro tunnelling activities exceed a noise
management goal of LA90 +10dB (50-60dB(A)) for activities three (3) weeks or
longer at residential properties within 150 metres of the construction activities.
Depending on the final selection of the drilling rig some engineering noise
controls may be feasible. Where feasible and practical, engineering noise controls
and work practices will be considered to minimise noise impacts (Section 5).
Directional drilling activities will be restricted to the daytime hours of 7.00am to
6.00pm Monday to Friday, and 7.00am to 1.00pm Saturday. It is not envisaged
that micro tunnelling will be undertaken outside normal daytime hours, however
if it is required, notification will be provided to residents, Council and DECCW
prior to commencing the works.
Where directional drilling or micro tunnelling is required, construction activities
are not expected to exceed three (3) weeks at any one location, this noise impact
would likely be acceptable. Albeit night time work may be required when located
within close proximity to main roads or railways.
PERRAM & PARTNERS ATKINS ACOUSTICS