The
proposed widening of Tolo Highway
and Fanling Highway
between Island House Interchange and Fanling (the Project) is a Designated
Project under the Environmental Impact Assessment Ordinance (Cap. 499) (EIAO)
and is governed by an Environmental Permit
(EP-324/2008).
The Project aims to widen Tolo Highway and Fanling Highway to dual 4-lane
carriageway in order to alleviate the current traffic congestion problems and
to cope with the increasing transport demands to and from the urban areas and
also cross boundary traffic.
The
construction works for this Project will be delivered in 2 stages i.e. Stage 1
(between Island House Interchange and Tai Hang) and Stage 2 (between Tai Hang
and Wo Hop Shek Interchange). The construction works of Stage 1 will be
commenced in fourth quarter 2009 and completed in mid 2013; while Stage 2 will
be commenced in late 2010 and completed in 2014. This report focuses on Stage 1
of the Project only.
In
accordance with the updated Environmental Monitoring and Audit Manual (EM&A
Manual) for Stage 1 of the Project, baseline monitoring of air quality is
required. However, as noise monitoring is also required at 7 monitoring
locations during the construction phase of the Project, baselines noise
monitoring was also conducted for reference purpose. This report documents the
baseline monitoring of air quality at 4 sensitive receivers and noise
monitoring at 7 sensitive receivers.
The
baseline monitoring of both air quality and noise was carried out between 20
October 2009 and 4 November 2009. Air quality was recorded in terms of 1-hour
Total Suspended Particulates (TSP) and 24-hour TSP. The weather during the
monitoring period was mainly fine and sunny. For baseline noise levels, Leq(30-minutes)
were recorded for non-restricted hours (07:00 – 19:00 of normal weekdays) and Leq(5-minutes)
were recorded for restricted hours (19:00 – 23:00 and 23:00 – 07:00 of normal
weekdays, whole day of Sundays and Public Holidays).
The averaged 1-hour TSP
levels and 24-hour TSP levels at AM1-AM4 are summarized
as follows:
|
Air quality monitoring
location
|
AM1
|
AM2
|
AM3
|
AM4
|
|
Averaged 1-hr TSP (μg/m3)
|
80.2
|
79.9
|
79.8
|
80.5
|
|
Averaged 24-hr TSP (μg/m3)
|
71.6
|
74.7
|
97.0
|
105.4
|
The averaged baseline
noise levels are summarized in the following table:
|
Noise monitoring location
|
NM1
|
NM2
|
NM3
|
NM4
|
NM5
|
NM6
|
NM7
|
|
Averaged baseline noise level during daytime
of normal weekdays (dB(A))
|
64.2
|
68.1
|
64.8
|
67.4
|
65.2
|
64.5
|
61.5
|
|
Averaged baseline noise level during evening
time and Public Holidays (dB(A))
|
61.3
|
64.9
|
64.2
|
65.1
|
64.5
|
61.9
|
56.2
|
|
Averaged baseline noise level during
night-time (dB(A))
|
56.5
|
63.8
|
59.0
|
59.9
|
63.9
|
60.3
|
53.3
|
1.1. Background
1.1.1.
Tolo Highway and Fanling Highway are
expressways in the North
East New
Territories connecting
Sha Tin, Tai Po and Fanling. These highways form a vital part of the strategic
Route 1, which links Hong Kong
Island to Shenzhen. At
present, this section of Route 1 is dual 3-lane carriageway. However, at
several major interchanges along this section of Route 1, the highway is only dual-2
lane. Severe congestion is a frequent occurrence during peak periods,
particularly in the Kowloon
bound direction.
1.1.2.
The objective of the Project “Widening of Tolo
Highway / Fanling Highway
between Island House Interchange and Fanling” is to widen Tolo Highway and Fanling Highway to dual 4-lane
carriageway in order to alleviate the current traffic congestion problems and
to cope with the increasing transport demands to and from the urban areas and
also cross boundary traffic.
1.1.3.
The Project is a designated project and is governed
by an Environmental Permit (EP-324/2008)(EP).
1.1.4.
The scope of the Project comprises mainly:
|
(i)
|
Widening
of a 5.7 km section of Tolo Highway and 3.0 km section of Fanling Highway
between Island House Interchange and Wo Hop Shek Interchange from the
existing dual 3-lane to dual 4-lane, including construction of new vehicular
bridges;
|
|
(ii)
|
Widening
of interchange sections at Island House Interchange, Tai Po North
Interchange, and Lam Kam Road Interchange from dual 2-lane to dual 3-lane,
including realignment of various slip roads;
|
|
(iii)
|
Modification
and reconstruction of highways, vehicular bridges, underpasses and
footbridges.
|
1.1.5.
The construction works for this Project will be delivered
in 2 stages i.e. Stage 1 (between Island House Interchange and Tai Hang) and
Stage 2 (between Tai Hang and Wo Hop Shek Interchange). The construction works
of Stage 1 will be commenced in fourth quarter 2009 and completed in mid 2013;
while Stage 2 will be commenced in late 2010 and completed in 2014. This report
focuses on Stage 1 of the Project only.
1.1.6.
The Highways Department (Major Works Project
Management Office) has commissioned AECOM Asia Company Limited to undertake the
Environmental Team (ET) services for implementation of all the EM&A works
under the Contracts for Stage 1 of the Project from Island House Interchange to
Tai Hang. In accordance with the updated
EM&A Manual of the Project, environmental baseline conditions were
established by the ET prior to the commencement of construction of the Project.
1.1.7.
Baseline
monitoring was undertaken and baseline monitoring report was prepared prior to
commencement of construction of the Project in accordance with Condition 3.2 of
EP and the updated EM&A Manual.
1.2.
Purpose of the
Baseline Monitoring Report
1.2.1.
The purpose of this report is to review the
baseline conditions of air quality and noise at the Project site, and to
establish baseline levels for air quality in accordance with the updated
EM&A Manual. These levels would be used as the basis for assessing
environmental impact and compliance during construction of the Project.
Besides, since impact noise monitoring is required, in accordance with the
updated EM&A Manual, during the construction period of the Project,
baseline noise monitoring was conducted
and the monitoring results are presented in this baseline monitoring report for
reference purpose.
1.2.2.
This baseline monitoring report presents the baseline
monitoring requirements, methodologies and monitoring results of air quality
and noise conducted at 4 air quality sensitive receivers and 7 noise sensitive
receivers described in the updated EM&A Manual.
2.1.1
In accordance with the updated EM&A Manual, baseline
1-hour and 24-hour TSP levels at 4 air quality monitoring stations should be
established by conducting baseline 1-hour and 24-hour TSP monitoring for at
least 14 days.
2.2
2.2.1
24-hour TSP air quality monitoring was performed using High
Volume Sampler (HVS) located at each designated monitoring station. The HVS
meets all the requirements of the updated EM&A Manual. Portable direct reading dust meters were used
to carry out the 1-hour TSP monitoring.
Brand and model of the equipment is given in Table 2.1.
Table 2.1 Air
Quality Monitoring Equipment
|
Equipment
|
Brand and
Model
|
|
Portable direct reading dust meter (1-hour TSP)
|
Sibata Digital Dust Monitor (Model No. LD-3)
|
|
High Volume Sampler
(24-hour TSP)
|
Tisch Total Suspended Particulate Mass Flow
Controlled High Volume Air Sampler (Model No. TE-5170)
|
2.3
2.3.1
Monitoring locations AM2 and AM3 were set up at the
proposed locations in accordance with updated EM&A Manual. However, for
monitoring locations: Dynasty View (AM1) and Tai Po Garden (AM4), proposed in
the updated EM&A Manual, as approval could not be obtained from the owner’s
corporation of the premises, baseline air quality monitoring was conducted at
alternative monitoring locations. Figure 2.1 shows the locations of monitoring
stations. Table 2.2 describes the details of the monitoring stations.
Table 2.2 Locations of Baseline Noise Monitoring
Stations
|
Monitoring Station
|
Location
|
Description
|
|
AM1
|
13 Ha Wun Yiu
|
Ground floor outside
the premises
|
|
AM2
|
12 Shan Tong New Village
|
Ground floor outside the premises
|
|
AM3
|
Riverain Bayside
|
Roof of the switch room
|
|
AM4
|
Tai Kwong Secondary School
|
Roof of the school
|
2.4
2.4.1
Table 2.3 summarizes the monitoring parameters, frequency
and duration of baseline TSP monitoring.
Table 2.3 Air Quality Monitoring Parameters,
Frequency and Duration
|
Parameter
|
Frequency and
Duration
|
|
1-hour TSP
|
3
times (at three consecutive hours) per day while the highest dust impact was
expected, for 14 days
|
|
24-hour TSP
|
Daily,
for 14 days
|
2.5
2.5.1
24-hour TSP Monitoring
(a)
The HVS was installed in the vicinity of the air sensitive
receivers. The following criteria were
considered in the installation of the HVS.
(i)
A horizontal platform with appropriate support to
secure the sampler against gusty wind was provided.
(ii)
The distance between the HVS and any obstacles, such
as buildings, was at least twice the height that the obstacle protrudes above
the HVS.
(iii)
A minimum of 2 meters separation from walls,
parapets and penthouse for rooftop sampler.
(iv)
No furnace or incinerator flues nearby.
(v)
Airflow around the sampler was unrestricted.
(vi)
Permission was obtained to set up the samplers and
access to the monitoring stations.
(vii)
A secured supply of electricity was obtained to
operate the samplers.
(viii)
The sampler was located more than 20 meters from
any dripline.
(ix)
Any wire fence and gate, required to protect the
sampler, did not obstruct the monitoring process.
(x)
Flow control accuracy was kept within ±2.5%
deviation over 24-hour sampling period.
(b)
Preparation of Filter Papers
(i)
Glass fibre filters, G810 were labelled and
sufficient filters that were clean and without pinholes were selected.
(ii)
All filters were equilibrated in the conditioning
environment for 24 hours before weighing. The conditioning environment
temperature was around 25 °C
and not variable by more than ±3
°C; the relative humidity (RH) was < 50% and not variable by
more than ±5%. A convenient working RH was 40%.
(iii)
All filter papers were prepared and analysed by ALS
Technichem (HK) Pty Ltd., which is a HOKLAS accredited laboratory and has
comprehensive quality assurance and quality control programmes.
(c)
Field Monitoring
(i)
The power supply was checked to ensure the HVS
works properly.
(ii)
The filter holder and the area surrounding the
filter were cleaned.
(iii)
The filter holder was removed by loosening the four
bolts and a new filter, with stamped number upward, on a supporting screen was
aligned carefully.
(iv)
The filter was properly aligned on the screen so
that the gasket formed an airtight seal on the outer edges of the filter.
(v)
The swing bolts were fastened to hold the filter
holder down to the frame. The pressure
applied was sufficient to avoid air leakage at the edges.
(vi)
Then the shelter lid was closed and was secured
with the aluminum strip.
(vii)
The HVS was warmed-up for about 5 minutes to
establish run-temperature conditions.
(viii)
A new flow rate record sheet was set into the flow
recorder.
(ix)
On site temperature and atmospheric pressure
readings were taken and the flow rate of the HVS was checked and adjusted at
around 1.1 m3/min, and complied with the range specified in the
updated EM&A Manual (i.e. 0.6-1.7 m3/min).
(x)
The programmable digital timer was set for a
sampling period of 24 hrs, and the starting time, weather condition and the
filter number were recorded.
(xi)
The initial elapsed time was recorded.
(xii)
At the end of sampling, on site temperature and
atmospheric pressure readings were taken and the final flow rate of the HVS was
checked and recorded.
(xiii)
The final elapsed time was recorded.
(xiv)
The sampled filter was removed carefully and folded
in half length so that only surfaces with collected particulate matter were in
contact.
(xv)
It was then placed in a clean plastic envelope and
sealed.
(xvi)
All monitoring information was recorded on a
standard data sheet.
(xvii)
Filters were then sent to ALS Technichem (HK) Pty
Ltd. for analysis.
(d)
Maintenance and Calibration
(i)
The HVS and its accessories were maintained in good
working condition, such as replacing motor brushes routinely and checking
electrical wiring to ensure a continuous power supply.
(ii)
HVSs were calibrated using TE-5025A Calibration Kit prior to the commencement
of baseline monitoring.
(iii)
Calibration certificate of the TE-5025A Calibration Kit and the HVSs are
provided in Appendix A.
2.5.2
1-hour TSP Monitoring
(a)
Measuring Procedures
The measuring procedures of the 1-hour dust
meter were in accordance with the Manufacturer’s Instruction Manual as follows:
(i)
Turn the power on.
(ii)
Close the air collecting opening cover.
(iii)
Push the “TIME SETTING” switch to [BG]
(iv)
Push “START/STOP” switch to perform background
measurement for 6 seconds.
(v)
Turn the knob at SENSI ADJ position to insert the
light scattering plate.
(vi)
Leave the equipment for 1 minute upon “SPAN CHECK”
is indicated in the display.
(vii)
Push “START/STOP” switch to perform automatic
sensitivity adjustment. This measurement takes 1 minute.
(viii)
Pull out the knob and return it to MEASURE
position.
(ix)
Push the “TIME SETTING” switch the time set in the
display to 3 hours.
(x)
Lower down the air collection opening cover.
(xi)
Push “START/STOP” switch to start measurement.
(b)
Maintenance and Calibration
(i)
The 1-hour TSP meter was calibrated at 1-year
intervals against a continuous particulate TEOM Monitor, Series 1400ab. Calibration certificates of the Laser Dust
Monitors are provided in Appendix A.
2.6.1
The baseline monitoring was carried out in October and
November 2009, during which, the weather was mostly sunny. Major dust sources
were from nearby traffic emissions.
2.6.2
Baseline 1-hour TSP monitoring was carried out from 20
October 2009 to 2 November 2009 for consecutively 14 days.
2.6.3
Baseline 24-hour TSP monitoring was carried out
consecutively between 20 October 2009 and 4 November 2009. As there were a few
occasions of high volume sampler failure and power interruption: the filter
papers and hence the results were void, supplementary monitoring events were
carried out to fulfill the 14 days baseline monitoring requirement.
2.6.4
The baseline monitoring results for 1-hour TSP and 24-hour
TSP are summarized in Table 2.4 and 2.5 respectively. Detailed air quality
monitoring results are presented in Appendix B.
Table 2.4 Summary
of 1-hour TSP Baseline Monitoring Results
|
|
AM1
|
AM2
|
AM3
|
AM4
|
|
Average (μg/m3)
|
80.2
|
79.9
|
79.8
|
80.5
|
|
Range (μg/m3)
|
71.3 – 89.2
|
70.1 – 86.3
|
65.7 – 86.0
|
71.5 – 89.9
|
Table 2.5 Summary of 24-hour TSP Baseline Monitoring Results
|
|
AM1
|
AM2
|
AM3
|
AM4
|
|
Average (μg/m3)
|
71.6
|
74.7
|
97.0
|
105.4
|
|
Range (μg/m3)
|
27.8 – 119.4
|
39.7 – 122.1
|
54.3 – 164.2
|
58.3 – 147.2
|
2.7.1
The air quality monitoring results, in terms of 1-hour TSP
and 24-hour TSP, were below the Limit Level set out in the Air Quality
Objective (AQO) at both monitoring locations.
2.7.2
The Action and Limit Levels for air quality impact
monitoring were based on the criteria adopted from the updated EM&A Manual
as presented in Table 2.6.
Table 2.6 Derivation of Action and Limit Levels
for Air Quality
|
Parameter
|
Action Level
|
Limit Level
|
|
1-hour TSP Level in μg/m3
|
For Baseline Level <384 μg/m3,
Action Level = (130% of baseline level + Limit level) ÷ 2
For Baseline Level > 384 μg/m3,
Action Level = Limit Level
|
500
|
|
24-hour TSP
Level in μg/m3
|
For Baseline Level <200 μg/m3,
Action Level = (130% of baseline level + Limit level) ÷ 2
For Baseline Level > 200 μg/m3,
Action Level = Limit Level
|
260
|
2.7.3
Table 2.7 shows the derived Action and Limit Levels for air
quality impact monitoring for the Project.
Table 2.7 Action and Limit Levels for Air
Quality
|
Parameter
|
Monitoring Station
|
Action Level (μg/m3)
|
Limit Level (μg/m3)
|
|
1-hour TSP
Level in μg/m3
|
AM1
|
302.1
|
500
|
|
AM2
|
301.9
|
500
|
|
AM3
|
301.9
|
500
|
|
AM4
|
302.3
|
500
|
|
24-hour TSP Level in μg/m3
|
AM1
|
176.6
|
260
|
|
AM2
|
178.6
|
260
|
|
AM3
|
193.1
|
260
|
|
AM4
|
198.5
|
260
|
3.1.1
Although baseline noise monitoring is not a requirement in
accordance with the updated EM&A Manual, as impact noise monitoring is
required during the construction phase of the Project, baseline noise
monitoring at 7 monitoring stations was conducted, for consecutively 14 days,
to obtain background noise levels at the area for reference purpose.
3.2.1
Noise monitoring was performed using sound level meter at
each designated monitoring station. The
sound level meters deployed comply with the International Electrotechnical
Commission Publications (IEC) 651:1979 (Type 1) and 804:1985 (Type 1)
specifications. Acoustic calibrator was
deployed to check the sound level meters at a known sound pressure level. Brand and model of the equipment is given in
Table 3.1.
Table 3.1 Noise Monitoring Equipment
|
Equipment
|
Brand and Model
|
|
Integrated Sound Level
Meter
|
B&K (Model No.
2238)
|
|
Rion NL-18
|
|
Rion NL-31
|
|
Acoustic Calibrator
|
B&K (Model No.
4231)
|
|
Rion NC-73
|
3.3.1
Monitoring stations NM3, NM6 and NM7 were set up at the
proposed locations in accordance with updated EM&A Manual. However, for
monitoring locations: Tai Po Garden (NM1), Dynasty View (NM2), Hong Kong
Teachers’ Association Lee Heng Kwei Secondary School (NM4) and Grand Palisades
(NM5), proposed in the updated EM&A Manual, baseline noise monitoring was conducted
at alternative monitoring locations, as approval of access could not be
obtained from the owner’s corporation of the premises or the principal of the
education institutes. Figure 2.1 shows the locations of the monitoring
stations. Table 3.2 describes the details of the two monitoring stations.
Table 3.2 Locations of Baseline Noise Monitoring
Stations
|
Monitoring Station
|
Location
|
Description
|
|
NM1
|
Tai Kwong Secondary School
|
1m from the exterior of the roof top façade of the
School
|
|
NM2
|
38 Ha Wun Yiu
|
1.2m from the ground floor free-field of the
village house
|
|
NM3
|
Wong Shiu Chi Middle School
|
1m from the exterior of the roof top façade of the
New Wing
|
|
NM4
|
Uptown Plaza
|
1m from the exterior of the roof top façade of
Block 4
|
|
NM5
|
The Paragon
|
1.2m ground floor
free-field at the front gate
|
|
NM6
|
PLK Tin Ka Ping
Primary School
|
1.2m ground floor
free-field near the entrance
|
|
NM7
|
Riverain Bayside
|
1m from the exterior of the roof façade of the
switch room
|
3.4.1
Table 3.3 summarizes the monitoring parameters, frequency
and duration of baseline noise monitoring.
Table 3.3 Noise Monitoring Parameters, Frequency
and Duration
|
Time Period
|
Duration, min
|
Parameters
|
|
Daytime:
0700-1900 hrs on normal weekdays
|
30 (Leq(30-min))
|
Leq, L90
& L10
|
|
Evening:
1900-2300 hrs on normal weekdays
|
15 (average of 3 consecutive Leq(5-min))
|
|
General
Holidays and Sundays
0700-2300 hrs
|
|
Night-time:
2300-0700 hrs on all days
|
3.5.1
Monitoring Procedure
(a)
Façade measurements were made at all monitoring
locations, except monitoring stations NM2, NM5 and NM6.
(b)
The sound level meter was set on a tripod at a
height of 1.2 m above the ground
for free-field measurements at NM2, NM5 and NM6.
(c)
The battery condition was checked to ensure the
correct functioning of the meter.
(d)
Parameters such as frequency weighting, the time
weighting and the measurement time were set as follows:
(i)
frequency weighting: A
(ii)
time weighting: Fast
(iii)
time measurement: Leq(30-minutes) during
non-restricted hours i.e. 07:00 – 1900 on normal weekdays; Leq(5-minutes)
during restricted hours i.e. 19:00
– 23:00 and 23:00 – 07:00 of normal weekdays, whole day of Sundays and Public
Holidays
(e)
Prior to and after each noise measurement, the
meter was calibrated using the acoustic calibrator for 94dB(A) at 1000 Hz. If the difference in the calibration level
before and after measurement was more than 1 dB(A), the measurement would be
considered invalid and repeat of noise measurement would be required after
re-calibration or repair of the equipment.
(f)
During the monitoring period, the Leq, L10
and L90 were recorded. In
addition, site conditions and noise sources were recorded on a standard record
sheet.
(g)
Noise measurement was paused during periods of high
intrusive noise (e.g. dog barking, helicopter noise) if possible. Observations
were recorded when intrusive noise was unavoidable.
(h)
Noise monitoring was cancelled in the presence of
fog, rain, wind with a steady speed exceeding 5m/s, or wind with gusts exceeding 10m/s.
3.5.2
Maintenance and Calibration
(a)
The microphone head of the sound level meter was
cleaned with soft cloth at regular intervals.
(b)
The meter and calibrator were sent to the supplier
or HOKLAS laboratory to check and calibrate at yearly intervals.
(c)
Calibration certificates of the sound level meters
and acoustic calibrators are provided in Appendix A.
3.6.1
There was no other major activity influencing the measured
noise level during the baseline noise monitoring period. The dominant noise
sources were from community noises, school activities and nearby traffic
emissions.
3.6.2
Baseline noise monitoring was conducted for consecutively
14 days, from 20 October 2009 to 3 November 2009.
3.6.3
The baseline noise monitoring results are summarized in
Tables 3.4 to 3.6. Detailed noise monitoring results are presented in Appendix
C.
Table 3.4 Summary of Baseline Daytime Noise
Monitoring Results
|
0700-1900 hrs of normal weekdays
|
30-min Mean
of Noise Levels, dB(A)
|
Range, dB(A)
|
|
Leq
|
L10
|
L90
|
Leq
|
|
NM1
|
64.2
|
66.0
|
59.9
|
63.1 – 65.9
|
|
NM2
|
68.1*
|
71.1*
|
62.2*
|
66.9 – 69.0
|
|
NM3
|
64.8
|
67.2
|
60.5
|
63.8 – 65.6
|
|
NM4
|
67.4
|
68.2
|
65.7
|
66.4 – 68.8
|
|
NM5
|
65.2*
|
67.7*
|
60.8*
|
63.6 – 66.6
|
|
NM6
|
64.5*
|
65.9*
|
62.1*
|
61.8 – 68.4
|
|
NM7
|
61.5
|
63.1
|
57.9
|
59.3 – 65.4
|
*+3dB(A) Façade
correction included
Table 3.5 Summary of
Baseline Evening, Sunday and Public Holiday
Noise Monitoring Results
|
1900-2300
hrs of normal weekdays, 0700-2300 hrs of Sundays and Public Holidays
|
5-min Mean
of Noise Levels, dB(A)
|
Range, dB(A)
|
|
Leq
|
L10
|
L90
|
Leq
|
|
NM1
|
61.3
|
63.9
|
56.1
|
59.6 – 62.2
|
|
NM2
|
64.9*
|
66.8*
|
60.8*
|
61.9 – 68.4
|
|
NM3
|
64.2
|
66.9
|
59.5
|
62.9 – 66.1
|
|
NM4
|
65.1
|
66.2
|
63.2
|
64.2 – 66.1
|
|
NM5
|
64.5*
|
66.8*
|
60.8*
|
62.2 – 67.0
|
|
NM6
|
61.9*
|
63.2*
|
59.8*
|
59.2 – 64.2
|
|
NM7
|
56.2
|
57.6
|
53.0
|
52.2 – 59.8
|
*+3dB(A)
Façade correction included
Table
3.6 Summary of Baseline
Night-time Noise Monitoring Results
|
2300-0700 hrs
|
5-min Mean
of Noise Levels, dB(A)
|
Range, dB(A)
|
|
Leq
|
L10
|
L90
|
Leq
|
|
NM1
|
56.5
|
59.5
|
49.7
|
54.4 – 57.8
|
|
NM2
|
63.8*
|
66.8*
|
58.2*
|
61.0 – 66.7
|
|
NM3
|
59.0
|
61.6
|
53.4
|
57.9 – 60.8
|
|
NM4
|
59.9
|
61.7
|
56.5
|
58.1 – 61.8
|
|
NM5
|
63.9*
|
66.5*
|
59.6*
|
59.9 – 66.1
|
|
NM6
|
60.3*
|
61.3*
|
59.0*
|
58.9 – 63.4
|
|
NM7
|
53.3
|
54.2
|
50.9
|
51.4 – 55.2
|
*+3dB(A)
Façade correction included
3.6.4
At all monitoring locations, the averaged baseline daytime
noise monitoring results are within the criteria of 75dB(A) for residential
premises and 70dB(A) for educational institutions.
3.6.5
However, although no construction work was carried out in
the vicinity, the baseline daytime noise levels recorded at Tai Kwong Secondary
School (NM1), Wong Shiu Chi Middle School (NM3) and PLK Tin Ka Ping Primary
School (NM6) approached or even exceeded the Limit Level of 65dB(A) for
educational institutions during examination period.
3.6.6
The averaged baseline night-time noise monitoring results
exceeded the criteria of 55dB(A) at all monitoring locations, except for
monitoring location NM7.
3.7.1
The Action and Limit Levels of noise monitoring have been set
in accordance with the derivation criteria specified in the updated EM&A
Manual as shown in Table 3.7 below.
Table 3.7 Criteria for Action and Limit Levels
for Construction Noise
|
Time
Period
|
Action
Level
|
Limit
Levels
|
|
0700-1900 hrs of
normal weekdays
|
When one documented complaint is received
from any one of the sensitive receivers
|
65/70/75 dB(A)*
|
|
1900-2300 hrs of normal weekdays, 0700-2300 hrs of Sundays and Public Holidays
|
60/65/70 dB(A)**
|
|
2300-0700 hrs
|
45/50/55 dB(A)**
|
* Standard maximum permissible noise level for different
nature of the NSR(s) in accordance with the TM
on Environmental Impact Assessment Process.
** To be selected based on the Area
Sensitivity Rating of A/B/C, and the conditions of the applicable CNP(s) must
be followed.
3.7.2
Area Sensitivity Ratings of the noise sensitive receivers
(NSRs) of the Projects are considered as “C” as they are directly affected
urban areas. Since NM1, NM3 and NM6 are educational institutions, it is
anticipated that they would be closed after 19:00 of normal weekdays and on
Sundays and Public Holidays. Therefore, Action and Limit Levels during
restricted hours would not be applicable. The Action and Limit Levels for
impact noise monitoring are derived and presented in Table 3.8 below.
Table 3.8 Action and Limit Levels for
Construction Noise of the Project
|
Time
Period
|
Monitoring
Station
|
Action
Level
|
Limit
Levels
|
|
0700-1900 hrs of
normal weekdays
|
NM1
|
When one documented complaint is received
from any one of the sensitive receivers
|
65/70 dB(A)*
|
|
NM2
|
75 dB(A)
|
|
NM3
|
65/70 dB(A)*
|
|
NM4
|
75 dB(A)
|
|
NM5
|
75 dB(A)
|
|
NM6
|
65/70 dB(A)*
|
|
NM7
|
75 dB(A)
|
|
1900-2300 hrs of normal weekdays, 0700-2300 hrs of Sundays
and Public Holidays
|
NM1
|
When one documented complaint is received
from any one of the sensitive receivers
|
N/A
|
|
NM2
|
70 dB(A)
|
|
NM3
|
N/A
|
|
NM4
|
70 dB(A)
|
|
NM5
|
70 dB(A)
|
|
NM6
|
N/A
|
|
NM7
|
70 dB(A)
|
|
2300-0700 hrs
|
NM1
|
When one documented complaint is received
from any one of the sensitive receivers
|
N/A
|
|
NM2
|
55 dB(A)
|
|
NM3
|
N/A
|
|
NM4
|
55 dB(A)
|
|
NM5
|
55 dB(A)
|
|
NM6
|
N/A
|
|
NM7
|
55 dB(A)
|
* 70dB(A) for normal daytime and 65dB(A) for daytime during
examination period
4.1.1
Baseline air quality monitoring was carried out from 20
October 2009 to 4 November 2009 at 4 monitoring stations. Action Levels for air
quality at each location were derived from the baseline monitoring results.
4.1.2
Baseline noise monitoring was carried out from 20 October
2009 to 3 November 2009 at 7 monitoring stations for reference purpose. The
Action Level of construction noise is based on documented complaints received,
while the Limit Level is the level at a specific limit according to EIAO-TM.
4.1.3
The averaged baseline daytime noise levels recorded at Tai
Kwong Secondary School (NM1), Wong Shiu Chi Middle School (NM3) and PLK Tin Ka
Ping Primary School (NM6) approached the Limit Level of 65dB(A) for educational
institutions during examination period.
4.1.4
The averaged baseline night-time noise monitoring results
exceeded the criteria of 55dB(A) at all monitoring locations, except for
monitoring location NM7.
