Lam
Kam Tunnel Portal Site for Aquaduct Construction between Tai Po
and Butterfly Valley
The
project involved the construction of a 12 km long aquaduct by bored
tunnelling to transfer water from a major new water treatment facility
in the New Territories to Kowloon.
Environmental
Concern
There
were scattered village houses at a distance of 140 - 250 m
away from the tunnel portal. The major environmental concern
was the vibration caused by rock blasting at night as well
as the noise generated by drilling and blasting works. |
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Measures
Adopted
Quiet
Method - A heavy-duty blasting door was constructed
at the tunnel portal to achieve a noise reduction of 15 dB(A).
Screening
- Noise barriers at the side of residential houses were erected
to protect the villagers from construction noise impact.
Administration
- Most of the blasting operations were rescheduled to daytime
to minimise the noise disturbance at night.
Monitoring
- Noise monitoring was conducted by an independent environmental
team to audit the construction noise levels at the nearest
Noise Sensitive Receiver. |
Blasting door constructed
to achieve a noise reduction of 15 dB(A)
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Noise barriers erected to protect villagers from
construction noise impact
Observations
& Achievements
Given
the large scale of the tunnelling work as well as the close proximity
of the village houses, the potential noise disturbance could be
significant. Yet, with the noise-reduction measures including the
noise barriers and blasting door, the noise disturbance was effectively
kept to a minimal.
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