3.1
Monitoring Requirement
3.1.1
In accordance with the approved EM&A
Manuals, Leq (30min) monitoring is conducted for at
least once a week during the construction phase between 0700 and 1900 on normal
weekdays at the designated monitoring locations.
3.2
Monitoring Equipment
3.2.1
The sound level meter used in noise
monitoring will comply with the International Electrotechnical
Commission Publication (IEC) 651:1979 (Type 1) and 804:1985 (Type 1)
specifications as referred to in the Technical Memorandum issued under the
Noise Control Ordinance (NCO).
3.2.2
Sound
level calibrator will be used for the on-site calibration of the meter. This
calibrator complies with the IEC Publication 942 (1988) Class 1 and ANSI S1.40
- 1984. Noise measurements were only accepted to be valid if the calibration
levels from before and after the measurement agree to within 1.0dB.
3.2.3
Measurements shall be recorded to the nearest
0.1dB. Sound level meters are programmed to measure A-weighted equivalent
continuous sound pressure level at 30-minute
intervals between 0700 and 1900
on normal weekdays at least once a week when construction activities are
underway.
Table
3.1
summarizes the noise monitoring equipment model being used for this project.
3.3
Monitoring Parameters and
Frequency
Table 3.2 presents
the noise monitoring parameters and frequencies.
3.4
Monitoring Methodology
3.4.1
The monitoring procedures are as follows:
n The monitoring station is set
at a point 1m from the exterior of the sensitive receivers building façade and set
at a position 1.2m above the ground.
n The battery condition is
checked to ensure good functioning of the meter.
n Parameters such as frequency
weighting, the time weighting and the measurement time are set as follows:
n frequency weighting : A
n time weighting : Fast
n measurement time : Weekly 30
minutes between 0700-1900 on normal weekdays
n Prior to and after noise
measurement, the meter shall be calibrated using the calibrator for 94.0 dB at
1000 Hz. If the difference in the calibration level before and after
measurement is more than 1.0 dB, the measurement will be considered invalid and
repeat of noise measurement is required after re-calibration or repair of the
equipment.
n Noise monitoring should be
cancelled in the presence of fog, rain, and wind with a steady speed exceeding
5 m/s, or wind with gusts exceeding 10 m/s.
n Noise measurement should be
paused during periods of high intrusive noise if possible and observation shall
be recorded when intrusive noise is not avoided.
n At the end of the monitoring
period, the Leq, L10 and L90 are recorded. In
addition, site conditions and noise sources are recorded on a standard record
sheet.
3.5
Maintenance / Calibration
3.5.1
Maintenance
and Calibration procedures are as follows:
n The microphone head of the sound
level meter and calibrator should be cleaned with a soft cloth at quarterly
intervals.
n The
sound level meter and calibrator should be calibrated annually by a HOKLAS
laboratory.
n Relevant
calibration certificates are provided in Appendix
D.
3.6.1
According to the EM&A Manual, three noise
monitoring locations, namely KTD1, KTD2 and KER1, are covered by this Contract
within the South Apron Area of Former Kai Tak
Airport. The other two noise monitoring locations, which are identified in Cha Kwo Ling area, are farther than 300m away from the site
boundary and thus not covered by this Contract. The monitoring works in Cha Kwo Ling area are covered by other Contract(s)
respectively.
3.6.2
According to the approved alternative baseline
air quality and noise monitoring locations (EPD reference: () in EP2/K19/A/21
pt.5), the original monitoring locations (KTD1, KTD2 and KER1) are proposed to
be replaced by alternative monitoring locations (KTD1a, KTD2a and KER1a) for
noise monitoring.
3.6.3
According to the approved relocation of
monitoring location KER1a (EPD reference: () in EP2/K19/A/21 pt.5), the
monitoring location KER1a are proposed to be relocated by alternative
monitoring locations KER1b for noise monitoring.
3.6.4
According to the approved relocation of
monitoring location KTD2a (EPD reference: () in EP2/K19/A/21 pt.6), the
monitoring location KTD2a are proposed to be relocated by alternative
monitoring locations KTD2b for noise monitoring.
3.6.5
The most updated locations are summarized in Table 3.3
and shown in Figure 2.
3.7.1
The schedule of noise monitoring in reporting month
is provided in Appendix E.
3.7.2
During the monitoring month, at KTD1a, project
related construction activities and road traffic along Shing
Fung Road and Shing Cheong Road were observed in the surroundings. At
KTD2b, road traffic along the Kwun Tong By-pass and
non-project related construction activities at the nearby construction site was
observed. At KER1b, project
related construction activities, road traffic along Cheung Yip Street and
non-project related construction activities at the nearby construction site was
observed. Major noise sources including
noise emission from plant & PME and some other construction activities,
travel of vehicles, loading and unloading of C&D waste were observed in the
site. The above factors may affect the monitoring
results.
3.7.3
No raining and wind with speed over 5 m/s was
observed during noise monitoring according to the onsite observation. The
weather conditions during the monitoring month are provided in Appendix K.
3.7.4
The noise monitoring data are summarized in Table 3.4. Detailed monitoring data are
presented in Appendix G.
3.7.5
No Action / Limit Level exceedance of location
KTD1a, KTD2b and KER1b was recorded for construction noise in the reporting
month.
3.7.6
The Action and Limit Levels for noise impact
monitoring have been set and are presented in Appendix C.
3.7.7
The Event and Action Plan for noise is given in Appendix H.
3.8
Comparison
of Noise Monitoring Results with EIA Predictions
3.8.1
The noise monitoring data was compared with the EIA
predictions as summarized in Table 3.5.