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.
3.6.7
The existing monitoring location KTD2b is
located within the works area of Contract No. ED/2018/04 (Trunk Road T2 and
Infrastructure Works for Developments at the Former South Apron) and the works
at the existing monitoring locations would generate non-project related
interference to the monitoring. The proposal of
relocation of monitoring location KTD2b for noise monitoring was submitted to
EPD on 24 March 2020 for approval under condition 3.1 of EP-451/2013 and
Section 3.3.1.2 of the approved EM&A manual for Trunk Road T2
(AEIAR-174/2013) and was approved by EPD on 6 April 2020. Monitoring Location
KTD2b was relocated to the approved location KTD2c, effective from 9 April
2020.
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, project related construction
activities and road traffic along Shing Fung Road and Shing Cheong Road were observed in the
surroundings. At KTD2b & 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, KTD2b / 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.