4.            BASELINE ENVIRONMENTAL MONITORING (NOISE IMPACT)

 

4.1         Monitoring Requirements

 

In accordance with the EM&A Manual, baseline monitoring shall be carried out daily for a period of at least 14 consecutive days at the designated monitoring stations. The noise levels shall be measured in terms of the A-weighted equivalent continuous sound pressure level (Leq).

 

4.2         Monitoring Methodology

 

Field Monitoring

 

The monitoring procedures are as follows:

 

n  The monitoring station was 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 was checked to ensure good functioning of the meter.

n  Parameters such as frequency weighting, the time weighting and the measurement time will set as follows:

 

n   frequency weighting : A

n   time weighting : Fast

n   measurement time : Daily between 0700 and 1900 hrs

 

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 considered invalid and repeat of noise measurement is required after re-calibration or repair of the equipment.

n  The wind speed at the monitoring station shall be checked with the portable wind meter. 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 shall be recorded. In addition, site conditions and noise sources should be recorded on a standard record sheet.

 

4.3         Types of Equipment Used and Calibration Details

 

Monitoring Equipment

 

The noise levels were determined using sound level meter. The meter complies 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).

 

Sound level calibrators were 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.

 

Measurements shall be recorded to the nearest 0.1dB. This noise monitors are programmed to measure A-weighted equivalent continuous sound pressure level at 30-minute intervals on normal weekdays and at 5-minute interval during other time periods. The noise measurement shall be conducted continuously throughout the measurement period between 0700 and 1900 hrs during daytime for 14 consecutive days.

 

Table 4.1 summarizes the noise monitoring equipment model being used for this project.

 

Table 41       Noise Monitoring Equipment

Item

Equipment

Model Number

Serial Number

1

Integrating Sound Level Meter

Casella CEL-633A

4637931

2

Integrating Sound Level Meter

Casella CEL-633C

4637966

3

Integrating Sound Level Meter

B&K2250

2704792

4

Integrating Sound Level Meter

B&K2250

3000103

5

Calibrator

Casella CEL-120/1

5230742

6

Wind Speed Anemometer

Smart Sensor AR816+

 

 

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.

 

Current calibration certificates with name of laboratory are attached in Appendix A.

 

4.4         Parameters Monitored

 

In accordance with the EM&A Manual, baseline noise for the A-weighted levels Leq, L10 and L90 was recorded. Data obtained from the baseline noise monitoring was processed and presented according to the following periods:

 

n   Daytime: 0700-1900 hrs on normal weekdays

n   Holiday-time: 0700-1900 hrs on holidays

 

4.5         Monitoring Locations

 

Table 4.2  gives  the  location  of  the  monitoring  station  during  the  baseline  noise monitoring, and is also shown in Figure 3.1 of Appendix D.

 


Table 42 Location of Noise Monitoring Station

Monitoring Station

Location of Measurement

NM3 - The Victoria Towers - Tower 1

Podium (about 3/F) Area

NM4 - Canton Road Government Primary School

5/F Podium

 Note:

 Noise monitoring at NM1 - Harbourside Tower 1, NM2 – The Arch – Sun Tower could not be conducted due to objections from property owners. Details are explained in the following section “Seeking Permission from Premises Owner for Setting Up Monitoring Station”.

 

Seeking Permission from Premises Owner for Setting Up Monitoring Station

 

Initially, baseline noise monitoring was proposed to be conducted at the noise monitoring stations as specified in the EM&A Manual, including NM1 – The Harbourside Tower 1, NM2 – The Arch – Sun Tower, NM3 – Victoria Towers and NM4 – Canton Road Government Primary School.

 

Site visit was conducted with the representatives of Property Management Company on 4 July 2014 at The Harbourside Tower 1 and The Arch – Sun Tower for selecting the most representative location for environmental monitoring. Letter was sent and phone call was made to the responsible staff of the Property Management Company to explain the purpose and details regarding to the environmental monitoring since June 2014. However, the notification of not permitting the setup of environmental (air quality and noise) monitoring equipments at The Harbourside Tower 1 and The Arch – Sun Tower was received from the Property Management Company of The Harbourside Tower 1 and The Arch respectively. Letters of rejection by the owners committee is shown in Appendix G.

 

In April 2015, Property Management Companies of both The Harbourside and The Arch were approached again to request for baseline noise monitoring to be carried out at their premises.  Despite repeated enquiries, property owners insist on not allowing the set up of monitoring equipment within their premises.

 

Subsequently, alternative noise monitoring locations to obtain baseline noise level had been explored on the podium level of Kowloon Station as well as construction area of XRL 810B to place sound level meter for baseline monitoring. Responsible staff from the property management company of ICC and MTR XRL 810B had been contacted. However, adverse comments were received from both property management company of ICC and MTR. Correspondences with XRL and property management company of ICC is shown in Appendix G. 

 

To explore other practicable monitoring locations and methods in obtaining representative noise level, Highways Department had been approached on the possibility of conducting baseline noise and construction noise monitoring by mounting sound level meter on public street lamp pole at Austin Road West. The request was turned down by Highways Department.  Correspondences with Highways Department, including the reply to enquiry of giving reason to the rejection is shown in Appendix G. 

 

While baseline noise monitoring could not be arranged on or above the podium level of The Harbourside Tower 1 and The Arch – Sun Tower, effort will be made to lobby the owners committee of the two NSRs in hope of getting their consent to allow impact monitoring to be carried out during construction phase.

 

Table 4.3 summarizes the types of measurement undertaken for each monitoring stations.

 

Table 43 Type of Measurement

Monitoring Station

Measurement Type

NM3 - The Victoria Towers - Tower 1

Façade measurement

NM4 - Canton Road Government Primary School

Façade measurement

 

4.6         Monitoring Date, Time, Frequency and Duration

 

Table 4.4 presents the noise monitoring parameters and frequencies.

 

Table 44 Monitoring Parameters and Frequencies of Noise Monitoring

Monitoring

Stations

Parameter

Frequency and Period

NM3 & NM4

LAeq (30 min)

(L10 and L90 will also record as supplementary information)

Continuously throughout the measurement period for 14 consecutive days

 

Measurement Period: Daytime: 0700-1900 hrs on normal weekdays

LAeq (5 min)

(L10 and L90 will also record as supplementary information)

Continuously throughout the measurement period for 14 consecutive days

 

Measurement Period: General Holidays and Sundays: 0700-1900 hrs

 

The environmental monitoring schedule is shown in Table 4.5.

 

Table 45   Monitoring Schedule

July - Aug 2014

SUN

MON

TUE

WED

THU

FRI

SAT

20 Jul

 

21

 

22

 

 

N3

N4

23

 

 

N3

N4

24

 

 

N3

N4

25

 

 

N3

N4

26

 

 

N3

N4

27

 

 

N3

N4

28

 

 

N3

N4

29

N1

 

N3

N4

30

N1

N2

 

N4

31

N1

N2

 

N4

1 Aug

N1

N2

 

N4

2

N1

N2

 

N4

3

N1

N2

 

N4

4

N1

N2

 

N4

5

N1

N2

 

 

6

N1

N2

 

7

N1

N2

N3

8

N1

N2

N3

9

N1

N2

N3

10

N1

N2

N3

11

N1

N2

N3

12

 

N2

 

13

 

 

 

 

14

 

 

N3

15

 

 

 

16

 

January 2015

SUN

MON

TUE

WED

THU

FRI

SAT

18

19

20

21

22

 

 

N3

23

24

25

 

 

N3

26

27

28

29

30

31

 

Note:     

n  N3, N4 – Noise monitoring at NM3 and NM4 for 14 consecutive days before commencement of construction work.

n  Due to site conditions (objection from property owner), noise monitoring at NM3 was suspended on 30/7- 31/7 and 1/8-6/8, and rescheduled to 7/8-11/8.

n  As monitoring equipment was damaged by pedestrian passing by, the noise monitoring at NM3 was suspended on 12/8-13/8, and rescheduled to 14/8.

n  Due to outliers recorded during 10/8-11/8, noise monitoring data of NM3 on these two days was disregarded. Supplementary noise monitoring was conducted on 22/1/2015 and 25/1/2015.

 

4.7         Baseline Monitoring Observations

 

According to on-site observation, the influencing factor in the vicinity of the monitoring stations was recorded. A summary of the weather and influencing factors for baseline monitoring works is given below:

 

Table 46    Summary of the Weather and Influencing Factors for Baseline Monitoring Works

Monitoring

Stations

Date

Influencing Factors

And Major Activities

NM3

July 2014

Aug 2014

Jan 2015

Road traffic noise

22

23

24

25

26

27

28

29

07

08

09

14

22

25

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NM4

July 2014

Aug 2014

Road traffic noise

22

23

24

25

26

27

28

29

30

31

01

02

03

04

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Remarks

Sunny

 

Cloudy

 

Rainy

 

Sunday

 

 

 

4.8         Quality Assurance (QA) / Quality Control (QC) Results and Detection Limits

 

  The sound level meter and calibrator were calibrated annually by the manufacturer or a HOKLAS laboratory. Current calibration certificates are attached in Appendix A.

 

4.9         Results

 

Results

 

Baseline noise monitoring was conducted at the monitoring station in the period between 22 July 2014 and 14 August 2014.

 

Due to potential disorder of monitoring equipment, outlying data was recorded during 10 and 11 August at NM3 - Victoria Towers. To eliminate interference caused by these outliers, noise monitoring data on these two days was discarded. Data was replaced by that of supplementary baseline noise monitoring conducted on 22 and 25 January 2015.

 

In addition, baseline noise monitoring at noise monitoring station NM1 The Harbourside Tower 1 and NM2 The Arch Sun Tower could not be carried out due to rejections from both property management offices of The Harbourside and The Arch. After all the alternative approaches (refer to Section 4.5) in obtaining the baseline noise monitoring data at NM1 and NM2 had been explored and exhausted due to site constraints or rejections, it is therefore decided to make reference to the measured noise level from the baseline monitoring of the Hong Kong Section of Guangzhou - Shenzhen - Hong Kong Express Rail Link (XRL) project.

 

The site location of West Kowloon Terminus of XRL and its associated works along Austin Road West is the immediate neighbour of the WKCD. The baseline noise monitoring of XRL project was conducted from December 2009 to January 2010 when there was no major construction activities of XRL project. The baseline noise data of XRL project is therefore considered a suitable reference to be adopted in this monitoring report.

 

Reference was made to the baseline noise data measured at Star Tower of The Arch (CN33), which is nearest monitoring location to WKCD, as provided in the XRL Baseline Monitoring Report (Part 4) under the Environmental Permit No. EP-349/2009. Location is shown in Appendix D.

(Retrieved from http://www.epd.gov.hk/eia/register/english/permit/ep3492009/documents/blmr4/pdf/blmr4.pdf)

 

Given the baseline noise level in the vicinity of WKCD and MTR XRL (Agreement No. 810B –West Kowloon Terminus Station South) is mainly contributed by traffic noise, it is therefore necessary to compare the road traffic data in the vicinity of WKCD and XRL - West Kowloon Terminus Station South to investigate the changes in traffic flow of Lin Cheung Road and Austin Road West between 2009 and 2013 to determine whether the baseline noise level of XRL project can be adopted. 

 

Road traffic data in 2009 and 2010 has represented the traffic condition of that period of time when the baseline noise monitoring of the XRL project was conducted. On the other hand, because the latest annual traffic census issued by Transport Department is that of 2013, traffic data of 2013 is therefore used to represent the recent traffic condition.

 

Figures in Table 4.7 have summarized that the changes in road traffic of Lin Cheung Road and Austin Road West from 2009 to 2013. The figures have shown that the changes in annual average daily traffic between 2009 and 2013 are insignificant, except the section of Austin Road West between Lin Cheung Road and Canton Road. The average annual daily traffic of the road section has been increased from 10,090 to 15,230 between 2010 and 2013.

 

The increase in traffic flow at the road section of Austin Road West was due to the construction works of the West Kowloon Terminus Station South of XRL project, which commenced in 2010. Site entrance of the XRL construction site was located at the Austin Road West between Wui Man Road and Lin Cheung Road. Because of the construction site and related road diversions, construction vehicles entering or leaving the construction site, as well as other diverted vehicles, had caused an increase in traffic flow at this particular section of Austin Road West between Lin Cheung Road and Canton Road. Notwithstanding the increase in traffic flow at the section of Austin Road West between Lin Cheung Road and Canton Road, it is considered to be temporary due to the construction activities of West Kowloon Terminus Station.

 

Furthermore, the section of Austin Road West between Lin Cheung Road and Canton Road has a maximum distance of around 500 metres to the Star Tower of the Arch, reference baseline noise monitoring station of the XRL project, and the originally proposed noise monitoring station NM1 and NM2, therefore the significance of traffic at this road section in affecting the noise level would be limited. 

 

Considering the change of traffic flow at road sections of Austin Road West and Lin Cheung Road (represented by Station no. 3298, 4093 and 4094) is not significant and these road sections are in the vicinity of WKCD and MTR XRL, it is justifiable to adopt the baseline noise level data of XRL project for analysis.

 

Consent has been obtained from MTR to make reference to the data of XRL Baseline Monitoring Report. Correspondences with MTR and Annual Average Daily Traffic of 2010 and 2013 extracted from Annual Traffic Census are provided in Appendix H.

 

Table 47   Change in Road Traffic of Lin Cheung Road and Austin Road West from 2010 to 2013

Station no.*

Road Name

Average Annual Daily Traffic

2009

2010

2012

2013

3298*

Lin Cheung Road
(From Wui Cheung Rd to Austin Rd West)

13,930

13,860

14,810

13,230

4093*

Lin Cheung Road
(From Jordan Rd to Wui Cheung Rd)

28,970

28,820

28,490

29,460

3710*

Austin Rd W
(From Lin Cheung Rd to Canton Rd)

-

10,090

14,930

15,230

4094*

Austin Rd W
(From Lin Cheung Rd to Nga Cheung Rd)

13,320

13,250

14,310

12,080

Note:

* Station no. is assigned in Annual Traffic Census 2010 and 2013

* Road Traffic Data are retrieved from Annual Traffic Census issued by Transport Department.

 

Baseline noise monitoring results are summarized in Table 4.8. Baseline noise monitoring results obtained at NM3, NM4 and the data referenced from the XRL Project Baseline Monitoring Report are given in Appendix B. Graphical presentations of the data are provided in Appendix C.

 

Table 48            Summary of Daytime Noise Monitoring Results

Daytime 0700-1900 hrs

Range of Noise Level, dB(A)

Leq (30min)

L10

L90

Mean

Max

Min

Mean

Max

Min

Mean

Max

Min

NM3

67.2

86.7

56.9

73.0

86.1

59.7

63.8

76.7

52.9

NM4

73.5

78.4

69.7

75.5

80.4

73.0

69.9

73.6

62.2

CN33#

65.4

67.3

62.5

66.8

69.5

64.0

63.3

64.9

60.0

Note:

# Monitoring station ID number of The Arch, Star Tower, as referred from XRL Baseline Monitoring Report

 

4.10       Action and Limit Levels

 

The Action and Limit Levels were established in accordance with the EM&A Manual. The baseline noise level shall be referenced during the compliance check in the impact noise monitoring period. Table 4.9 presents the Action and Limit Levels for construction noise.

 

Table 49            Action and Limit Levels for Noise

Time Period

Action Level

Limit Level

0700-1900 hrs on normal weekdays

When one documented complaint is received

75 dB(A)

70 dB(A) / 65 dB(A)*

Remarks:

If works to be carried out during restricted hours, the conditions stipulated in the Construction Noise Permit (CNP) issued by the Noise Control Authority have to be followed.

* 70dB(A) and 65dB(A) for schools during normal teaching periods and school examination periods, respectively.

 

The Event and Action Plan for Construction Noise is given in Table 4.10.

 

Table 410  Event and Action Plan for Construction Noise

Event

Action

ET

IEC

WKCDA

Contractor

Action Level

1. Notify WKCDA, IEC and Contractor;

2.  Carry out investigation;

3. Report the results of investigation to the IEC, WKCDA and Contractor;

4. Discuss with the IEC and Contractor on remedial measures required;

5. Increase monitoring frequency to check mitigation effectiveness.

1. Review the investigation results submitted by the ET;

2. Review the proposed remedial measures by the Contractor and advise the WKCDA accordingly;

3. Advise the WKCDA on the effectiveness of the proposed remedial measures.

1. Confirm receipt of notification of failure in writing;

2. Notify Contractor;

3. In consolidation with the IEC, agree with the Contractor on the remedial measures to be implemented;

4. Supervise the implementation of remedial measures.

1. Submit noise mitigation proposals to IEC and WKCDA;

2. Implement noise mitigation proposals.

Limit Level

1. Inform IEC, WKCDA, Contractor and EPD;

2. Repeat measurements to confirm findings;

3. Increase monitoring frequency;

4. Identify source and investigate the cause of exceedance;

5. Carry out analysis of Contractor’s working procedures;

6. Discuss with the IEC, Contractor and WKCDA on remedial measures required;

7. Assess effectiveness of Contractor’s remedial actions and keep IEC, EPD and WKCDA informed of the results;

8. If exceedance stops, cease additional monitoring.

1. Discuss amongst WKCDA, ET, and Contractor on the potential remedial actions;

2. Review Contractor’s remedial actions whenever necessary to assure their effectiveness and advise the WKCDA accordingly.

1. Confirm receipt of notification of failure in writing;

2. Notify Contractor;

3. In consolidation with the IEC, agree with the Contractor on the remedial measures to be implemented;

4. Supervise the implementation of remedial measures;

5. If exceedance continues, consider stopping the Contractor to continue working on that portion of work which causes the exceedance until the exceedance is abated.

1. Take immediate action to avoid further exceedance;

2. Submit proposals for remedial actions to IEC and WKCDA within 3 working days of notification;

3. Implement the agreed proposals;

4. Submit further proposal if problem still not under control;

5. Stop the relevant portion of works as instructed by the WKCDA until the exceedance is abated.