Revision History

0

1st Submission

27/6/2018

1

2nd Submission

3/7/2018

Rev.

Description of Modification

Date

 

 


 

 

CONTENT

 

EXECUTIVE SUMMARY.. 4

1      INTRODUCTION.. 6

1.1        Background. 6

1.2        Purpose of the Baseline Monitoring Report 8

1.3        Report Structure. 8

2      NOISE MONITORING.. 9

2.1        Monitoring Requirements 9

2.2        Noise Monitoring Parameters, Time, Frequency and Duration. 9

2.3        Noise Monitoring Locations 9

2.4        Baseline Monitoring Methodology. 11

2.5        Monitoring Equipment 11

2.6        Results and Observations 12

2.7        Action and Limit Levels 12

3      CONCLUSION.. 14

 

 

List of Appendix

Appendix A       Construction Programme

Appendix B       Monitoring Scheulde

Appendix C          Noise Monitoring Equipment Calibration Certificates

Appendix D          Baseline Monitoring Data (Noise)


 

EXECUTIVE SUMMARY

The proposed Desalination Plant at Tseung Kwan O (DPTKO) will produce potable water with an initial capacity of 135 million liters per day (MLD), expandable to an ultimate capacity of 270 Mld in the future to provide a secure and alternative fresh water resource complying with the World Health Organization (WHO) standards.  The plant will adopt the Seawater Reverse Osmosis (SWRO) technology, which dominates the market due to its reliability and progressive reduction in cost as the technology advances.

In accordance with the approved Environmental Monitoring and Audit Manual (EM&A Manual) for the Project, baseline environmental monitoring for noise impact should be conducted prior to the commencement of construction works. Pursuant to EP Condition 3.4, Baseline Monitoring Report shall be submitted to the Director of Environmental Protection at least 2 weeks before the commencement of construction of the Project. Baseline monitoring for noise impact was conducted according to the EM&A Manual before the commencement of construction works at selected locations at Tseung Kwan O (TKO).

Monitoring on 7/6/2018 & 8/6/2018 were cancelled due to typhoon (Strong Wind Signal, No. 3) and the adverse weather (i.e. strong wind and heavy rain) it brought along; monitoring on 12/6/2018 was cancelled due to amber rainstorm warning. Thus, additional monitoring on 12/6/2018,13/6/2018 were scheduled, and the monitoring on 12/6/2018 was further postponed to 14/6/2018.

Daily baseline noise monitoring for A-weighted levels Leq, L10 and L90 were conducted in a sample period of 30 minutes during daytime (0700 – 1900 hrs). Details of the methodology, locations and results are presented in the report.

The baseline monitoring noise measured levels LAeq(30min.) on daytime (0700-1900 hrs) for the three Noise Sensitive Receivers (NSRs) range from 57.6 dB(A) – 72.6 dB(A). The baseline average levels, NSRs ID and Location are summarized as below. The baseline noise quality monitoring measurement and the result are recorded in Appendix D.

 

The baseline average levels as follows:

 

Daytime (0700-1900 hrs) LAeq(30min.)

NSR ID

Location

LAeq  (dB(A))

L10(dB(A))

L90 dB(A)

NSR4

Creative Secondary School

70.0

72.8

63.3

NSR24*

PLK Laws Foundation College

72.0

74.4

60.3

NSR31

School of Continuing and Professional Studies - CUHK

61.6

64.8

56.0

Remarks: *Free field correction +3dB(A) has been made for NSR24

 


 

Action and Limit Level Determination for Noise

 

Results of the baseline noise monitoring data are processed to provide Action Levels [“AL”] and Limit Levels [“LL”] as per the table below:

 

Time Period

Action

NSR ID

Location

Type of sensitive receiver(s)

Measurement Type

Limit (dB(A))

(0700-

1900 hrs)

on normal working day

When one documented complaint is received

NSR4

Creative Secondary School

Educational  

Facade

70 dB(A), 65 dB(A) during examination

NSR24

PLK Laws Foundation College

Educational

Free-field

NSR31

School of Continuing and Professional Studies - CUHK

Educational

Facade

 


 

1.   INTRODUCTION

1.1         Background

1.1.1        Penta-Ocean-Concentric Joint Venture ["POCJV"] is contracted to carry out the Mainlaying works for the development of Desalination Plant at Tseung Kwan O (DPTKO) under Contract No. 13/WSD/16 (hereinafter known as “the Project”). In line with the requirements stated in the Project EM&A Manual, POCJV is required to conduct the noise monitoring.

1.1.2        Acuity Sustainability Consulting Limited. [“ASCL”] is commissioned by POCJV to assist POCJV to carry out the Noise Monitoring in fulfillment of the EPD’s EM&A Requirements.

1.1.3        Pursuant to the Environmental Impact Assessment Ordinance (EIAO), the Director of Environmental Protection granted the further Environmental Permit (No. EP-503/2015/A) to Water Supplies Department (WSD) for this project.

1.1.4        The overall view of alignment of the Project is shown in Figure 1.1


 

 Figure 1.1 Overview of DPTKO


1.1.5        The updated construction programme is shown in Appendix A

1.2         Purpose of the Baseline Monitoring Report

1.2.1        The purposes of this Baseline Monitoring Report are to:

·        Summarise the findings of baseline noise monitoring; and

·        Establish the AL and LL in accordance with the EM&A Manual for the subsequent impact monitoring during the construction stage.

1.2.2        In accordance with the EM&A Manual, environmental baseline noise monitoring was carried out at three monitoring stations along the proposed alignment of the mainlaying works. This Baseline Monitoring Report contains baseline findings of these three monitoring stations.

1.3         Report Structure

1.3.1        This Baseline Monitoring Report comprises the following sections:

·        Section 1 introduces the background of the Project and purpose of this Report;

·        Section 2 presents the baseline monitoring methodologies, requirements, results, influencing factors, as well as determination of the AL and LL of noise; and

·        Section 3 concludes the findings of baseline monitoring.

 


 

2.   NOISE MONITORING

2.1         Monitoring Requirements

2.1.1        To ensure no adverse noise impact, noise monitoring is recommended to be carried out at the nearby NSRs during the construction phase.

2.1.2        In accordance with the EM&A Manual, baseline noise monitoring should be conducted for at least two weeks to obtain background noise levels prior to the commissioning of major construction works.

2.2         Noise Monitoring Parameters, Time, Frequency and Duration

2.2.1        The construction noise level shall be measured in terms of the A-weighted equivalent continuous sound pressure level (Leq,L10.,L90). At each designated monitoring location, measurements of 5-minutes A-weighted equivalent sound pressure level [“Leq 5min”] between 0700-1900 hrs shall be carried out. These measured “Leq 5min” shall be then combined into equivalent sound pressure level for 30-minutes period [“Leq 30min”] for comparison with the Noise Control Ordinance (NCO) criteria. Table 2.1 summarizes the monitoring parameters, frequency and duration of the baseline noise monitoring. The monitoring schedule is provided in Appendix B.

 Table 2.1 Noise Monitoring Parameters, Time, Frequency and Duration

Time

Frequency

Duration

Parameters

Daytime:

0700-1900 hrs

Daily for at least 14 days

Continuously in

Leq 5min/Leq 30min (average of 6 consecutive Leq 5min)

Leq, L10 & L90

 

2.3         Noise Monitoring Locations

2.3.1        According to the environmental findings detailed in the EIA report, the designated locations for the construction noise monitoring are listed in table 2.2.

Table 2.2 Noise Sensitive Receivers

NSR ID

Noise Sensitive Receivers

Monitoring Location

Position

NSR 4

Creative Secondary School

Roof Floor

1 m from facade

NSR 24

PLK Laws Foundation College

Pedestrian Road on Ground Floor

Free-field

NSR 31

School of Continuing and Professional Studies - CUHK

Roof Floor

1 m from facade

 

2.3.2        The monitoring locations should normally be made at a point 1m from the exterior of the NSRs building façade and be at a position 1.2m above the ground. A correction of +3dB(A) should be made to the free-field measurements.

2.3.3        Three practicable noise monitoring locations for noise measurement are proposed at the sensitive receivers as shown as in Figures 2.1 – 2.3 below:


Figure 2.1 NSR4 Creative Secondary School


5

Figure 2.2 NSR24 PLK Laws Foundation College


Figure 2.3 NSR31 School of Continuing and Professional Studies - CUHK

 

2.4         Baseline Monitoring Methodology

2.4.1        Baseline noise monitoring will be conducted for 14 consecutive days (Monday to Sunday). At each designated monitoring location, measurement of 30 minutes A-weighted equivalent sound pressure level [“Leq(30min), L10, L90”] should be carried out between 0700 and 1900 hrs for daytime measurements. Six measured “Leq(5min) will then be condensed into equivalent sound pressure level for 30-minutes period [“Leq(30min)“] for comparison with the NCO criteria.

2.4.2        During the baseline monitoring, there shall not be any construction activities in the vicinity of the monitoring locations and in the project site. Any non-project related construction activities in the vicinity of the monitoring stations during the baseline monitoring shall be noted and the source and location of such activities should be recorded. In accordance to current good practice for drafting of the Environmental Management Plan (EMP), the LL for school should be 70 dB(A) and 65 dB(A) during examination period.

2.5         Monitoring Equipment

2.5.1        Integrated sound level meter shall be used for the noise monitoring.  The meter shall be in compliance with the International Electrotechnical Commission Publications 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications. Immediately prior to and following each noise measurement the accuracy of the sound level meter shall be checked using an acoustic calibrator generating a known sound pressure level at a known frequency.  Measurements may be accepted as valid only if the calibration level before and after the noise measurements agree to within 1.0 dB(A). Calibration certificates of the instruments used are presented in Appendix C.

2.5.2        Noise measurements shall not be made in the presence of fog, rain, wind with a steady speed exceeding 5 m/s or wind with gusts exceeding 10 m/s. The wind speed shall be checked with a portable wind speed meter capable of measuring the wind speed in m/s.

Table 2.3 Baseline Noise Monitoring Equipment

Equipment

Brand and Model

Detection Limit

Sound Level Meter

Nti XL2

30-130 dB(A)

Sound Level Meter Calibrator

Rion NC-74

Nil

Pocket Wind Meter Anemometer

Kestrel 1000 Wind Meter

Nil

 

2.6         Results and Observations

2.6.1        Baseline monitoring for noise impact was conducted from 29/5/2018 to 14/6/2018. The baseline noise levels at Noise Monitoring Stations at TKO (i.e. NSR 4, 24 and 31) are summarized in Tables 2.4. Details of noise monitoring results are presented in Appendix D.

Table 2.4  Summary of Baseline Noise Monitoring Results

NSR ID

Noise in dB(A)

Average

Range

Leq 30min

L10 30min

L90 30min

Leq 30min

L10 30min

L90 30min

NSR 4

70.0

72.8

63.3

68.8-72.6

71.3-75.6

59.9-68.7

NSR 24*

72.0

74.4

60.3

68.8-74.9

70.9-77.0

56.5-64.6

NSR 31

61.6

64.8

56.0

57.6-69.1

60.0-72.2

51.4-60.5

Remarks: *Free field correction +3dB(A) has been made for NSR24

2.6.2        No construction activity was observed during the baseline monitoring. The major noise source at the monitoring station included the traffic noise and school activities. These noise sources are expected to exist in near future and throughout the construction period of the Project.

2.6.3        Monitoring on 7/6/2018 & 8/6/2018 were cancelled due to typhoon (Strong Wind Signal, No. 3) and the adverse weather (i.e. strong wind and heavy rain) it brought along; monitoring on 12/6/2018 was cancelled due to amber rainstorm warning. Thus, additional monitoring on 12/6/2018,13/6/2018 were scheduled, and the monitoring on 12/6/2018 was further postponed to 14/6/2018.

 

2.7         Action and Limit Levels

2.7.1        The AL and LL in line with the criteria of Practice Note for Professional Persons (ProPECC PN 2/93) “Noise from Construction Activities – Non-statutory Controls” ,Technical Memorandum on Environmental Impact Assessment Process issued by HKSAR Environmental Protection Department [“EPD”] under the Environmental Impact Assessment Ordinance, Cap 499, S.16 and EM&A Manual are presented in Table 2.4.

Table 2.4  Action and Limit Levels for Noise

Time Period

Action

Limit (dB(A))

0700-1900 hrs on normal weekdays

When one documented complaint is received from any one of the noise sensitive receivers

or

75 dB(A) recorded at the monitoring station

 

·  70 dB(A) for school and

·  65 dB(A) during examination period

Notes:

(a)   Limits specified in the GW-TM and IND-TM for construction and operation noise, respectively.


 

3.   CONCLUSION

3.1         Baseline noise monitoring was carried out from 29/5/2018 to 14/6/2018 at three monitoring stations at TKO. All monitoring stations as specified in EM&A Manual were accessible and thus there is no revision for inclusion in the EM&A Manual.

 

3.2         At NSR31, the averaged baseline daytime noise monitoring results were below the criteria of 70dB(A) for educational premises. At NSR4 and NSR24, the averaged baseline daytime noise monitoring results were above criteria of 70dB (A) for educational premises. The measured level during impact monitoring will be adjusted by the below equation when exceeded the baseline level:

Adjusted Measure Level = 10* Log ( 10^( Measured Level *0.1)- 10^(Baseline                          Level*0.1))

 

3.3         Traffic noise and school activities were observed as the major noise sources affecting the noise background at the three monitoring stations.

 

3.4         The Action Level of construction noise is based on documented valid complaints received, while the Limit Level for each monitoring location is set at a specific limit according to EIAO-TM and the EM&A Manual. The high background noise level of NSR4 and NSR24 recorded from the baseline study will be taken into account for the future EM&A programme during impact monitoring at construction phase.

 

 

 

 

Appendix A: Construction Programme




 

 

 

 

Appendix B: Monitoring Scheulde

 

Baseline Noise Monitoring Schedule

 

Date and

Monitoring Period

Noise Monitoring

Minimum 30-minutes monitoring period during (0700 – 1900 hrs)

Tue

29/5/2018

09:00 – 12:00

(14:30 for NSR4)

Leq(30min), L10, L90

Wed

30/5/2018

09:00 – 12:00

Leq(30min), L10, L90

Thu

31/5/2018

09:00 – 12:00

Leq(30min), L10, L90

Fri

1/6/2018

09:00 – 12:00

Leq(30min), L10, L90

Sat

2/6/2018

12:00 – 15:00

Leq(30min), L10, L90

Sun

3/6/2018

12:00 – 15:00

Leq(30min), L10, L90

Mon

4/6/2018

12:00 – 17:00

Leq(30min), L10, L90

Tue

5/6/2018

12:00 – 17:00

Leq(30min), L10, L90

Wed

6/6/2018

15:00 – 18:00

Leq(30min), L10, L90

Thu

7/6/2018

15:00 – 18:00

Leq(30min), L10, L90

Fri

8/6/2018

15:00 – 18:00

Leq(30min), L10, L90

Sat

9/6/2018

15:00 – 18:00

Leq(30min), L10, L90

Sun

10/6/2018

09:00 – 12:00

Leq(30min), L10, L90

Mon

11/6/2018

13:30 – 16:30

Leq(30min), L10, L90

Tue

12/6/2018

15:00 – 18:00

Leq(30min), L10, L90

Wed

13/6/2018

15:00 – 18:00

Leq(30min), L10, L90

Thu

14/6/2018

15:00 – 18:00

Leq(30min), L10, L90

 

Remark:

1.     Monitoring on 7/6/2018 & 8/6/2018 were cancelled due to typhoon (Strong Wind Signal, No. 3) and the adverse weather (i.e. strong wind and heavy rain) it brought along; monitoring on 12/6/2018 was cancelled due to amber rainstorm warning. Thus, additional monitoring on 12/6/2018,13/6/2018 were scheduled, and the monitoring on 12/6/2018 was further postponed to 14/6/2018.

 

 

 

Appendix C: Noise Monitoring Equipment Calibration Certificates


 

 

 

 

Appendix D: Baseline Monitoring Data (Noise)

 

NSR ID:

NSR4

Baseline monitoring period:

29/5/2018 to 14/6/2018

Parameter :

Leq 30min, L10 30min ,L90 30min

Major Site Activities

No construction works were conducted in the vicinity during the monitoring period.

Major dust source

Nearby traffic and school activities

Other Factors

NA

 

Date

Time

Weather

Leq-5min, dB(A)

L-30min, dB(A)

L10 -30min, dB(A)

L90-30min, dB(A)

Reading (1)

Reading (2)

Reading (3)

Reading (4)

Reading (5)

Reading (6)

29/5/2018

14:37-15:07

sunny

72.1

72.3

72.9

73.3

72.4

72.7

72.6

75.6

68.7

30/5/2018

9:53-10:23

sunny

68.7

69.0

68.6

69.6

68.8

69.4

69.0

72.3

61.0

31/5/2018

9:18-9:48

sunny

68.9

68.2

68.7

68.8

68.4

70.9

69.1

72.0

59.9

1/6/2018

15:20-15:50

sunny

69.4

72.7

68.7

69.5

70.1

69.1

70.1

73.0

62.3

2/6/2018

13:59-14:29

Fine

69.5

70.8

68.2

70.6

71.4

70.7

70.3

72.5

61.8

3/6/2018

13:53-14:23

Fine

69.1

69.4

68.0

68.8

70.1

69.5

69.2

72.4

62.0

4/6/2018

15:42-14:12

cloudy

70.1

71.6

71.8

70.3

70.5

71.4

71.0

72.9

63.0

5/6/2018

12:28-12:58

cloudy

69.4

68.7

69.9

70.2

71.5

70.6

70.1

72.1

62.8

6/6/2018

16:54-17:24

Cloudy

70.3

71.1

71.8

72.1

71.4

70.9

71.3

73.2

62.1

7/6/2018

cancelled due to typhoon and the adverse weather

8/6/2018

cancelled due to typhoon and the adverse weather

9/6/2018

14:26-14:56

fine

68.1

67.4

69.5

69.8

70.4

70.1

69.3

71.5

62.2

10/6/2018

14:16-14:46

Fine

68.3

69.0

68.6

69.4

68.7

69.0

68.8

71.3

61.9

11/6/2018

13:40-14:10

fine

69.8

68.3

69.2

69.0

69.2

67.9

68.9

72.3

61.6

12/6/2018

cancelled due to typhoon and the adverse weather

13/6/2018

15:14-15:44

Fine

68.4

69.3

68.7

69.1

69.6

70.3

69.3

73.5

63.6

14/6/2018

15:02-15:35

Fine

68.7

69.3

69.2

68.3

69.4

69.5

69.1

72.4

64.8

 

NSR ID:

NSR24

Baseline monitoring period:

29/5/2018 to 14/6/2018

Parameter :

Leq 30min, L10 30min ,L90 30min

Major Site Activities

No construction works were conducted in the vicinity during the monitoring period.

Major dust source

Nearby traffic and school activities

Other Factors

NA

 

Date

Time

Weather

Leq-5min, dB(A)

L-30min, dB(A)

L10 -30min, dB(A)

L90 -30min, dB(A)

Free-field Correction

L-30min, dB(A)

Free-field Correction

L10 -30min, dB(A)

Free-field Correction

L90 -30min, dB(A)

Reading (1)

Reading (2)

Reading (3)

Reading (4)

Reading (5)

Reading (6)

29/5/2018

10:18-10:48

sunny

67.9

71.1

66.2

68.3

68.7

67.8

68.6

70.5

55.4

71.6

73.5

58.4

30/5/2018

11:10-11:40

sunny

68.6

67.5

69.1

68.4

68.8

67.3

68.3

70.4

56.5

71.3

73.4

59.5

31/5/2018

10:35-11:05

sunny

69.2

68.6

67.1

68.9

68.6

68.6

68.5

72.0

55.9

71.5

75.0

58.9

1/6/2018

13:50-14:20

sunny

66.3

65.4

69.6

65.1

69.2

69.1

67.8

69.9

54.9

70.8

72.9

57.9

2/6/2018

12:57-13:27

Fine

68.6

67.8

69.0

68.3

68.5

69.3

68.6

70.8

56.3

71.6

73.8

59.3

3/6/2018

16:28-16:58

Fine

69.5

68.2

68.3

69.7

68.8

69.4

69.0

71.2

55.8

72.0

74.2

58.8

4/6/2018

16:55-17:25

cloudy

72.6

71.8

70.5

71.3

72.2

72.8

71.9

74.0

58.4

74.9

77.0

61.4

5/6/2018

13:34-14:04

cloudy

69.4

71.1

71.5

72.3

70.4

70.6

71.0

73.0

61.6

74.0

76.0

64.6

6/6/2018

14:06-14:36

Cloudy

71.5

69.3

68.8

70.4

71.0

69.6

70.2

72.4

59.4

73.2

75.4

62.4

7/6/2018

cancelled due to typhoon and the adverse weather

8/6/2018

cancelled due to typhoon and the adverse weather

9/6/2018

15:24-15:54

fine

64.3

65.2

65.8

67.1

66.4

65.3

65.8

67.9

59.7

68.8

70.9

62.7

10/6/2018

15:25-15:55

Fine

68.3

67.9

69.1

68.6

67.8

68.0

68.3

70.3

55.8

71.3

73.3

58.8

11/6/2018

14:49-15:19

fine

67.7

65.2

69.2

66.5

67.5

67.3

67.4

70.0

54.1

70.4

73.0

57.1

12/6/2018

cancelled due to typhoon and the adverse weather

13/6/2018

15:50-16:20

Fine

68.3

68.1

68.9

67.5

67.8

67.1

68.0

71.6

55.7

71.0

74.6

58.7

14/6/2018

17:06-17:31

Fine

70.4

66.2

70.6

69.6

68.4

61.0

68.6

72.6

53.5

71.6

75.6

56.5

Remarks: Free-field correction +3dB(A) has been made for NSR24

 

NSR ID:

NSR31

Baseline monitoring period:

29/5/2018 to 14/6/2018

Parameter :

Leq 30min, L10 30min ,L90 30min

Major Site Activities

No construction works were conducted in the vicinity during the monitoring period.

Major dust source

Nearby traffic and school activities

Other Factors

NA

 

Date

Time

Weather

Leq-5min, dB(A)

L-30min, dB(A)

L10 -30min, dB(A)

L90 -30min, dB(A)

Reading (1)

Reading (2)

Reading (3)

Reading (4)

Reading (5)

Reading (6)

29/5/2018

11:26-11:56

sunny

58.4

58.8

59.9

60.0

60.3

58.2

59.3

63.3

52.5

30/5/2018

12:16-13:46

sunny

58.8

54.7

57.3

60.9

58.7

58.1

58.5

60.7

53.7

31/5/2018

12:13-12:43

sunny

56.7

58.2

56.5

57.2

57.4

59.5

57.7

61.1

52.1

1/6/2018

12:06-12:36

sunny

59.9

61.6

59.3

60.1

58.2

59.3

59.9

62.8

55.8

2/6/2018

11:44-12:34

Fine

63.2

60.8

59.7

59.4

60.3

59.8

60.7

62.4

55.5

3/6/2018

15:19-15:49

Fine

59.7

58.5

57.9

57.3

59.0

58.8

58.6

60.4

52.8

4/6/2018

14:29-14:59

cloudy

67.9

68.3

69.9

69.1

69.4

69.6

69.1

72.2

60.5

5/6/2018

14:27-14:57

cloudy

60.4

61.3

61.5

62.2

64.1

63.2

62.3

64.4

58.3

6/6/2018

15:14-15:44

Cloudy

62.4

64.0

64.8

63.6

61.5

62.1

63.2

65.2

59.3

7/6/2018

cancelled due to typhoon and the adverse weather

8/6/2018

cancelled due to typhoon and the adverse weather

9/6/2018

16:22-16:52

fine

58.8

57.5

57.9

58.4

58.6

57.6

58.2

60.0

53.6

10/6/2018

16:10-16:40

Fine

59.1

57.9

58.3

58.7

57.8

59.3

58.6

60.1

52.7

11/6/2018

15:34-16:04

fine

58.0

59.3

57.2

56.6

56.6

57.0

57.6

60.8

51.9

12/6/2018

 cancelled due to typhoon and the adverse weather

13/6/2018

16:27-16:57

Fine

57.6

57.9

58.1

57.6

58.3

58.9

58.1

61.0

51.4

14/6/2018

16:04-16:34

Fine

57.4

58.7

57.8

59.2

57.0

57.7

58.0

67.5

58.8