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: 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 location 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 location KTD2b for noise monitoring.
3.6.5
According to the approved relocation of
monitoring location KTD2b (EPD reference: () in EP2/K19/A/21 pt.7), the
monitoring location KTD2b are proposed to be relocated by alternative
monitoring location KTD2c for noise monitoring.
3.6.6
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 reporting month, at KTD1a, road traffic along Shing Fung Road and Shing Cheong Road were observed in the surroundings. At KTD2c, 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, KTD2c 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.