13.1
Details of the environmental
monitoring and audit programme for impacted identified historical
buildings/structures are provided in this section. It is the responsibility of
the Project Proponent that all recommended mitigation measures should be fully
implemented.
13.2
It has been determined that the
maximum vibration level should be limited to a peak particle velocity (ppv)
limit of 25mm/s.
Monitoring of
Vibration Levels
13.3
In order to prevent potential
damage to historical buildings and structures, maximum limits for safe
vibration levels have been set at 25 mm/s. This vibration limit has been
applied in controlling vibrations due to blasting operations in Hong Kong by CEDD and MTRC. Vibration
monitoring shall be undertaken during blasting for tunnel, shafts, effluent
conveyance system and disinfection facilities in the vicinity of the buildings
/ structures as a requirement of EM&A programme in such a way that a maximum vibration level of 25 mm/s is not exceeded.
To ensure that this maximum limit is not exceeded, a monitoring schedule shall
be implemented. The monitoring should be undertaken through the use of measures
such as tell tales and tilting monitoring points to the historic buildings and
structures on a weekly basis. If vibration levels are found to exceed the
maximum limit of 25 mm/s, immediate corrective action shall be taken by
reducing the rate of forward progress, as necessary, to bring PPV levels within
compliance. Monitoring results should be submitted to the engineer in an agreed
format within two days of each monitoring undertaken. For installation and
removal of monitoring measures, disturbance to the historical
buildings/structures should be kept to the absolute minimum and the affected area
should be made good to match the existing.
13.4
A permit under Section 6 of the
Antiquities and Monuments Ordinance is required for the installation of
monitoring instruments within the boundary of the identified Declared Monument,
i.e. Western Market at Sheung Wan. The said permit can be applied through the
Antiquities and Monuments Office at 136
Nathan Road, Tsim Sha Tsui, Kowloon.
13.5
The implementation schedule for
the recommended mitigation measures is presented in Appendix A.