Document Control

Document Information

Project Title	Contract No. SPW 07/2020 Environmental Team for Construction of Yuen Long Effluent Polishing Plant Stage 1
Document Title	Pre-construction Survey Report of Ardeid Night Roost
Fugro Project No.	0120/20
Fugro Document No.	0120/20/ED/0281e
Issue Number	05
Issue Status	Final
Fugro Legal Entity	Fugro Technical Services Limited
Issuing Office Address	A Room 723 & 725, 7/F, Block B, Profit Industrial Building, 1-15 Kwai Fung Crescent, Kwai Chung, Hong Kong

Client Information

Client	Drainage Services Department
Client Address	45/F, Revenue Tower, 5 Gloucester Road, Wan Chai, Hong Kong
Client Contact	Mr. LAM Yu Wang

Document History

Issue	Date	Status	Comments on Content	Prepared By	Checked By	Approved By
01	28 Jan 2021	For review	Awaiting client and IEC comments	KJB	FN	YO
02	17 Feb 2021	For review	Addressed IEC 05 Feb comments	KJB	FN	YO
03	15 Mar 2021	For review	Addressed AFCD 12 Mar comments	KJB	FN	YO
04	16 Mar 2021	For review	Addressed AFCD 16 Mar comments	KJB	FN	YO
05	24 Mar 2021	For review	Addressed EPD 23 Mar comments	KJB	FN	YO
06	29 Mar 2021	Approved	No further comment from AFCD	KJB	FN	YO

Project Team

Initials	Name	Role
YO	David Y.O. Hung	Environmental Team Leader
FN	Fenelyn Nabuab	Ecologist
KJB	Kalvin Jay Boregon	Assistant Ecologist
RL	Ray Li	Assistant Environmental Consultant

Executive Summary

Fugro Technical Services Limited (FTS) has been appointed as the Environmental Team (ET) by Drainage Services Department (DSD) under Contract No. SPW 07/2020 Environmental Team for Construction of Yuen Long Effluent Polishing Plant Stage 1. As the ET, part of the scope, is to carry out a pre-construction survey for ardeid night roost in accordance with the requirements of EP Condition 2.11 and Section 7.3.5 of the approved EM&A Manual of the Yuen Long Effluent Polishing Plant (“the Project”).

Pre-construction surveys for ardeid roosts were conducted on January 2021, where initial survey was carried out on 12 January and confirmatory survey on 25 January. The surveys were undertaken in areas within 100 m from the Project boundary (“the Survey Area”).

Two active night roost areas were observed within the Survey Area during the surveys, i.e. one at the mangrove strip located east of the Project boundary and the other at the northeast side of the Project boundary. Four ardeid species including the Chinese Pond Heron Ardeola bacchus, Great Egret Ardea alba, Little Egret Egretta garzetta, and Grey Heron Ardea cinerea were observed utilizing the roosting sites. The roosting substrates were the mangrove species Sonneratia apetala and S. caseolaris. For the Pre-roosting aggregation (PRA), only one species, the Chinese Pond Heron was observed with the behaviour which started as early as 17:38, while during this time, final roosting activities for other ardeid species were concurrently noted already. No breeding activity was noted in both roosting areas as the breeding season of the ardeids have not begun yet.

Based on the findings of the surveys, it is recommended that use of powered mechanical equipment within 100 m buffer zone from the active night roosting sites after 17:30 during dry season will be restricted. Time restrictions during wet season (after 18:00) shall follow Section 7.3.11 of the approved EM&A Manual. Noise monitoring in stations as close as practicable to the active night roosts will be conducted concurrent with the construction phase monthly monitoring of the active night roosts.

Contents

Executive Summary i

1. INTRODUCTION 1

1.1 Background 1

1.2 Scope and Objectives of the Survey 1

1.3 Structure of the Report 2

3.2 Confirmatory Survey 4

4. SUMMARY, CONCLUSION, AND RECOMMENDATION 8

4.1.1 Monitoring Locations, Frequency, Time and Parameters 8

4.1.2 Proposed Action Level and Limit Level and Corresponding Responses in case/s of exceedance/s 9

4.1.3 Monitoring Equipment 10

4.1.4 Monitoring Procedure 11

5. REFERENCES 12

Tables in the Main Text

Table 3.1: Initial Survey Findings 7

Table 3.2: Confirmatory Survey Findings 8

Table 4.1: Noise Monitoring Parameters 10

Table 4.2: Action Level and Limit Level 11

Table 4.3: Event and Action Plan 11

Table 4.4: Noise Monitoring Equipment Specifications 13

Appendices

Abbreviations

DSD	Drainage Services Department
EIA	Environmental Impact Assessment
EIAO	Environmental Impact Assessment Ordinance
EM&A	Environmental Monitoring and Audit
EPD	Environmental Protection Department
EP	Environmental Permit
ET	Environmental Team
FTS	Fugro Technical Services Limited
HKO	Hong Kong Observatory
PRA	Pre-roost Aggregate
PRP	Pre-roost Period
YLEPP	Yuen Long Effluent Polishing Plant

1. INTRODUCTION

1.1 Background

1.1.1 The Yuen Long Effluent Polishing Plant (YLEPP) (“the Project”) is implemented to cope with the forecast increase in sewage flow upon completion of sewerage under interfacing projects, extension of village sewerage in area as planned by Environmental Protection Department (EPD), as well as the proposed housing developments in the region.

1.1.2 The Project is a designated project under Schedule 2 of the Environmental Impact Assessment Ordinance (EIAO) (Cap. 499) for which Environmental Impact Assessment (EIA) report and Environmental Monitoring and Audit (EM&A) Manual was approved by EPD (Register No.: AEIAR-220/2019) on 25 April 2019. The Environmental Permit (EP) (EP No. EP-565/2019) was issued by EPD on 26 April 2019.

1.1.3 Fugro Technical Services Limited (FTS) has been appointed as the Environmental Team (ET) by Drainage Services Department (DSD) under the Contract No. SPW 07/2020 Environmental Team for Construction of Yuen Long Effluent Polishing Plant Stage 1. As the ET, part of the scope, is to submit a Pre-construction Survey Report (“the Report”) after the conduct of the Pre-construction Survey within 100 m from the project boundary.

1.2 Scope and Objectives of the Survey

As described in Section 8.5.2.7 of the EIA Report, ardeid species of conservation importance (i.e. Little Egret, Great Egret, and Chinese Pond Heron) were observed roosting at night in the mangrove habitat northeast to the Project site during night-time surveys in June 2017 (Appendix A.1). The ardeid night roost observed, was not however, found during night-time surveys in July 2017. Further site checks in July 2018 showed that ardeids utilized again the mangrove habitat northeast to the Project site. Ardeids (over 60 individuals) were also observed roosting at the mangrove strip east of the Project site (Appendix A.1) in December 2018 but the ardeid night roost northeast to the Project site was not observed during the site visits.

In connection to this, the survey conducted with reference to EP Condition 2.11 and Section 7.3.5 of the EM&A Manual had the following objectives:

· Confirm the location (s) and status of any active ardeid night roost (s) within 100 m of the Project site boundary with reference to EP Condition 2.11 and Section 7.3.5 of the EM&A Manual; and

· Subject to survey findings, suggest a location as close to the night roost as practicable for monitoring of noise level during construction Section 7.3.5 of the EM&A Manual.

1.3 Structure of the Report

1.3.1 Succeeding this Section 1 Introduction, the remainder of this Report is presented as follows:

· Section 2 details the methodology of the Survey;

· Section 3 details the Survey results;

· Section 4 presents the summary, conclusion, and recommendations based on the Survey results.

2. METHODOLOGY

This section presents the methodology and approach of the Survey during the pre-construction stage of the Project. The Survey was conducted in accordance with the Method Statement that was agreed upon with the Agriculture, Fisheries and Conservation Department prior to the commencement of the Survey.

2.1 Survey Area

With reference from EP Condition 2.11 and Section 7.3.5 of the EM&A Manual, the Survey was conducted in areas within 100 m from the Project boundary (“the Survey Area”). The Survey Area and vantage points for direct observation of any active night roosts are shown in Appendix A.1.

2.2 Field Surveys

2.2.1 Surveys focused on any active ardeid roosts within the Survey Area particularly on the mangrove strips located east and northeast of the Project site along the banks of the tidally influenced Shan Pui River with reference to EIA Report sections 8.5.1.16 and 8.5.1.17. Primary data collection with the use of 7x and 10x binoculars; and field guides including the Avifauna of Hong Kong (Carey et al., 2001) and The Birds of Hong Kong and South China (Viney et al., 2005), was from about one hour before sunset time until about half an hour after sunset, the period when most ardeids return to a night roosting site. Sunset time was according to Hong Kong Observatory (HKO). An initial field survey of the area was conducted on 12 January 2021 and followed by an additional survey on 25 January 2021 to confirm the initial survey results.

2.2.2 Species composition, abundance and locations of night roosts were recorded. Species composition, abundance and location of pre-roosting aggregations (PRA) were also noted. PRAs are gatherings of avian individuals prior to flying into a night roost (Moore and Switzer, 1997). The time of return of the ardeids to the pre-roost and the final night roost were also recorded. Direct observations were made from vantage points adjacent the Project site with clear and unobstructed view of any active roosting location (s) within the Survey Area. However, aside from the established vantage points for the focused mangrove strips along Shan Pui River, observations were also conducted throughout the whole 100 m study site to cover other areas aside from the mangrove strips.

2.2.3 Observations such as bird droppings on the ground which may possibly indicate presence of night roosts were noted in addition to noting of the roosting substrate (i.e. substrate species and approximate height). Any breeding activity usage of the roosting locations within the Survey Area was also noted.

3. SURVEY RESULTS

Two active night roosts (NR) locations were observed within the Survey Area, 100 m study from the Project boundary (Appendix A.1). One NR was confirmed to be still present on the EIA pre-identified mangrove strip located approximately 40 m east of the Project boundary (Appendix B.1a) and a new NR several meters away from the pre-identified one and approximately 45 m northeast (Appendix B.1b.) of the Project boundary along the Shan Pui River.

A total of four ardeid species, i.e. Chinese Pond Heron Ardeola bacchus, Great Egret Ardea alba, Little Egret Egretta garzetta and Grey Heron Ardea cinerea, was observed utilizing the aforementioned roosting sites.

The mangrove species Sonneratia apetala (Appendix B.2a) and S. caseolaris (Appendix B.2b) were utilized as roosting substrates. Both Sonneratia species located east of the Project boundary had an approximate height of five meters while same species were of an approximate height of 3 to 4 meters on the northeast of the Project boundary.

3.1 Initial Survey

During the pre-roost period (PRP), the period when avian individuals gather first before flying into a night roost, in this case at around 17:38 of the survey, only PRA of the Chinese Pond Heron (Appendix B.3) with five individuals (ind.) was observed. The aggregate was noted on the exposed mudflat contiguous to their final roosting substrate the mangrove species S. apetala and S. caseolaris. The mudflat was exposed due to the low tide condition during that period. No PRAs of other ardeid species was recorded.

For the final night roost, different times were observed for the different species such that it started as early as around 17:38 onwards for the Great Egret and Little Egret; while a little later at around 18:03 for the Chinese Pond Heron. A total of 20 Great Egret individuals were observed utilizing the emergent to canopy layers of the aforementioned mangrove species at the roosting site northeast of the Project boundary while another 20 ind. of the Little Egret which arrived in flock also utilized the canopy to emergent layers of these roosting substrate, at the same site, for their final roost. On the other hand, at around 18:03, eight ind. of the Chinese Pond Heron were observed at the roosting site east of the Project boundary. These were roosting on the inner portion of the understory layer of the roosting substrate. Bird droppings were noted within the vicinity (Appendix B.4).

Summary of results is presented in Table 3.1.

3.2 Confirmatory Survey

During the PRP, the period with reference to the initial survey results, no PRA of the Chinese Pond Heron nor of any other ardeid species was observed within the survey area.

For the final night roost, unlike the results of the initial survey, all the four ardeid species (i.e. Chinese Pond Heron, Grey Heron, Great Egret and Little Egret) were observed to arrive at their respective final roost sites at around 18:15. A total of three ind. of Chinese Pond Heron and one ind. of Grey Heron were noted at the roosting site east of the Project boundary. Similar with the initial survey results, individuals of Chinese Pond Heron were still observed roosting on the inner portion of the understory layer of the roosting substrate. Meanwhile, the solitary Grey Heron was observed roosting at the exposed branch of the substrate’s understory layer. Bird droppings were noted within the vicinity. On the other hand, several ardeid species including Great Egret (seven ind.), Little Egret (12 ind.), Chinese Pond Heron (10 ind.) and Grey Heron (1 ind.) were noted roosting at the mangrove strip northeast of the Project boundary. Similar with initial survey results, individuals of Great Egret and Little Egret were observed utilizing the emergent to canopy layers of the roosting substrate; while the Chinese Pond Heron individuals utilized the inner understory portion of the substrate and Grey Heron used the outer portion of the understory layer.

Summary of results is presented in Table 3.2.

Table 3.1: Initial Survey Findings

Date: 12 January 2021 Tidal Condition: Low Tide
Pre-roost Period				Final roost Period
Time of Return:	17:38 (Chinese Pond Heron)			Time of Return:	17:38 (Great Egret and Little Egret); 18:03 (Chinese Pond Heron)
Parameters		Location		Parameters		Location
Parameters		ANR1	ANR2	Parameters		ANR1	ANR2
Pre-roost Aggregation (Y/N):		Y	N	Substrate Species:		Sonneratia apetala and S. caseolaris	Sonneratia apetala and S. caseolaris
Substrate Species:		Sonneratia apetala and S. caseolaris	Sonneratia apetala and S. caseolaris	Substrate Height (m):		Approximately 5 m.	Approximately 3-4 m.
Substrate Height (m):		Approximately 5 m.	Approximately 3-4 m.	Substrate Height (m):		Approximately 5 m.	Approximately 3-4 m.
Ardeid Species Composition		Abundance (individuals)		Ardeid Species Composition		Abundance (individuals)
Ardeid Species Composition		ANR1	ANR2	Ardeid Species Composition		ANR1	ANR2
Chinese Pond Heron Ardeola bacchus		5*	-	Chinese Pond Heron Ardeola bacchus		8	-
				Great Egret Ardea alba		-	20
				Little Egret Egretta garzetta		-	20
Breeding Activity (Y/N):		ANR1	N
Breeding Activity (Y/N):		ANR2	N
Notes: Pre-roost Period: Period when avian individuals gather first before flying into a night roost ANR1: Active ardeid night roost area east of the Project boundary ANR2: Active ardeid night roost area northeast of the Project boundary *: individuals aggregated on the exposed mudflat contiguous to their final mangrove roosting substrate -: not recorded

Table 3.2: Confirmatory Survey Findings

Date: 25 January 2021 Tidal Condition: High Tide
Pre-roost Period				Final roost Period
Time of Return:	-			Time of Return:	18:15
Parameters		Location		Parameters		Location
Parameters		ANR1	ANR2	Parameters		ANR1	ANR2
Pre-roost Aggregation (Y/N):		N	N	Substrate Species:		Sonneratia apetala and S. caseolaris	Sonneratia apetala and S. caseolaris
Substrate Species:		Sonneratia apetala and S. caseolaris	Sonneratia apetala and S. caseolaris	Substrate Height (m):		Approximately 5 m.	Approximately 3-4 m.
Substrate Height (m):		Approximately 5 m.	Approximately 3-4 m.	Substrate Height (m):		Approximately 5 m.	Approximately 3-4 m.
Ardeid Species Composition		Abundance (individuals)		Ardeid Species Composition		Abundance (individuals)
Ardeid Species Composition		ANR1	ANR2	Ardeid Species Composition		ANR1	ANR2
-		-	-	Chinese Pond Heron Ardeola bacchus		3	10
				Grey Heron Ardea cinerea		1	1
				Great Egret Ardea alba			7
				Little Egret Egretta garzetta			12
Breeding Activity (Y/N):		ANR1	N
Breeding Activity (Y/N):		ANR2	N
Notes: Pre-roost Period: Period when avian individuals gather first before flying into a night roost ANR1: Active ardeid night roost area east of the Project boundary ANR2: Active ardeid night roost area northeast of the Project boundary *: individuals aggregated on the exposed mudflat contiguous to their final mangrove roosting substrate -: not recorded

4. SUMMARY, CONCLUSION, AND RECOMMENDATION

Two active night roost sites were observed within the Survey Area, 100 m from the Project boundary. One site was located in the mangrove strip east of the Project boundary and the other in the northeast portion of the Project boundary. Four ardeid species including the Chinese Pond Heron, Great Egret, Little Egret and Grey Heron were observed utilizing the aforementioned roosting sites. The mangrove species S. apetala and S. caseolaris were utilized as roosting substrate. For the Pre-roosting aggregation (PRA), only one species, the Chinese Pond Heron was observed with the behaviour which started as early as 17:38, while during this time, final roosting activities for other ardeid species were concurrently noted already. No breeding activity was noted in both roosting areas as the breeding season of the ardeids have not begun yet.

According to the findings of the current survey, it is suggested that use of powered mechanical equipment within 100 m buffer zone from the active night roosting sites after 17:30 during dry season will be restricted. Time restrictions during wet season (after 18:00) shall follow Section 7.3.11 of the approved EM&A Manual. The relevant buffer zone is shown in Appendix A.1. The night roosts pre-identified in the EIA report were also considered in determining the maximum buffer zones to account for the dynamic roosting activities within the vicinity. Furthermore, noise monitoring will be conducted in stations (NMS1 and NMS2) (Appendix A.1) as close as practicable to these night roosts during the construction phase of the Project.

4.1 Recommended Noise Monitoring Activities

4.1.1 Monitoring Locations, Frequency, Time and Parameters

The recommended noise monitoring locations shall be established at 22°28’4.25”N, 114°1’41.32”E; and 22°28’10.43”N, 114°1’42.17”E for NMS1 and NMS2 stations, respectively. Monitoring frequency shall be once a month in concurrence with the construction phase monthly monitoring of the active night roosts for correlation. Monitoring time for both stations shall start around 17:38, the earliest pre-roost period recorded during the survey, and shall last for 30 minutes. Table 4.1 presents the monitoring parameters.

Table 4.1: Noise Monitoring Parameters

Parameter	Frequency and Period
LAeq (30 min) (L10 and L90 will be recorded for reference)	Monthly in concurrence with the construction phase monthly monitoring of the active night roosts

Parameter

Frequency and Period

LAeq (30 min)

(L10 and L90 will be recorded for reference)

Monthly in concurrence with the construction phase monthly monitoring of the active night roosts

4.1.2 Proposed Action Level and Limit Level and Corresponding Responses in case/s of exceedance/s

4.1.2.1 Proposed Action Level and Limit Level

As there are no specific guidelines on noise thresholds for roosting egrets, the Action and limit specified in Table 4.2 were based on study conducted on exploring behavioural responses of shorebirds to impulsive noise (Wright et al. 2010).

Table 4.2: Action Level and Limit Level

Time Period	Action Level	Limit Level
after 17:30 during dry season after 18:00 during wet season	65.5dB(A)¹	72.2 dB(A)²
Notes: 1. behavioural response of some kind more likely to occur 2. flight with abandonment of the site becomes the most likely outcome of the disturbance

Time Period

Action Level

Limit Level

after 17:30 during dry season

after 18:00 during wet season

65.5dB(A)¹

72.2 dB(A)²

Notes:

1. behavioural response of some kind more likely to occur

2. flight with abandonment of the site becomes the most likely outcome of the disturbance

Exceedances to the limit level shall be prevented by the full implementation of mitigation measures (Section 4.2 of this report) during the construction phase.

4.1.2.2 Proposed Event and Action Plan

In instances of exceedance/s in the proposed action and/or limit levels, the different measures as specified in Table 3.3 Event and Action Plan for Construction Noise of the approved EM&A Manual and presented in Table 4.3 of this report shall be implemented as responses.

Table 4.3: Event and Action Plan

Event	Action
Event	ET	IEC	ER	Contractor
Action Level	1. Notify IEC and Contractor; 2. Carry out investigation; 3. Report the results of investigation to the IEC, ER and Contractor; 4. Discuss with the Contractor and formulate remedial measures; and 5. Increase monitoring frequency to check mitigation effectiveness.	1. Review the analyzed results submitted by the ET; 2. Review the proposed remedial measures by the Contractor and advise the ER accordingly; and 3. Supervise the implementation of remedial measures.	1. Confirm receipt of notification of failure in writing; 2. Notify Contractor; 3. Require Contractor to propose remedial measures for the analyzed noise problem; and 4. Ensure remedial measures are properly implemented.	1. Submit noise mitigation proposals to IEC; and 2. Implement noise mitigation proposals.
Limit Level	1. Identify source; 2. Inform IEC, ER, EPD and Contractor; 3. Repeat measurements to confirm findings; 4. Increase monitoring frequency; 5. Carry out analysis of Contractor’s working procedures to determine possible mitigation to be implemented; 6. Inform IEC, ER and EPD the causes and actions taken for the exceedances; 7. Assess effectiveness of Contractor’s remedial actions and keep IEC, EPD and ER informed of the results; and 8. If exceedance stops, cease additional monitoring.	1. Discuss amongst ER, ET, and Contractor on the potential remedial actions; 2.Review Contractor’s remedial actions whenever necessary to assure their effectiveness and advise the ER accordingly; and 3. Supervise the implementation of remedial measures.	1. Confirm receipt of notification of failure in writing; 2. Notify Contractor; 3. Require Contractor to propose remedial measures for the analysed noise problem; 4. Ensure remedial measures are properly implemented; and 5. If exceedance continues, consider what portion of the work is responsible and instruct the Contractor to stop that portion of work until the exceedance is abated.	1. Take immediate action to avoid further exceedance; 2. Submit proposals for remedial actions to IEC within 3 working days of notification; 3. Implement the agreed proposals; 4. Resubmit proposals if problem still not under control; and 5. Stop the relevant portion of works as determined by the ER until the exceedance is abated.

4.1.3 Monitoring Equipment

With reference to the requirements of the Technical Memorandum (TM) issued under the NCO, the sound level meters for the monitoring activities 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. The measurements may be accepted as valid only if the difference between calibration levels obtained before and after the noise measurement is less than 1.0 dB. The equipment specifications are presented in Table 4.4.

Table 4.4: Noise Monitoring Equipment Specifications

Item	Brand	Model	Equipment
1	Casella	CEL-63X Series	Integrating Sound Level Meter
2	Casella	CEL-120/1	Calibrator
3	Benetech	GM816	Wind Speed Anemometer

The catalogue of the noise monitoring equipment is presented in Appendix C.1.

Current calibration certificates are presented in Appendix C.2.

4.1.4 Monitoring Procedure

· The battery condition shall be checked to ensure good functioning of the meter.

· Parameters such as frequency weighting, the time weighting and the measurement time shall be set as follows:

o frequency weighting: A

o time weighting: Fast

o measurement time: continuous 5 minutes interval

· Prior to and after noise measurement, each 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 shall be considered invalid and repeat of noise measurement is required after re-calibration or repair of the equipment.

· Noise measurements shall not be made in 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.

4.2 Recommended Measures to Minimize Impact on the Ardeid Night Roosts during Project Construction

4.2.1 Recommended Measure to Minimize Noise Impact

Restriction on the use of powered mechanical equipment within 100 m buffer zone from the active night roosting sites after 17:30 during dry season and after 18:00 during wet season throughout the construction phase of the Project as described in Section 7.3.11 of the approved EM&A Manual. For additional protection of the nearby night roosts, noise barriers with absorptive materials of at least 4m high shall be erected along the periphery of the Project Site including at its northern and eastern sides as required by EP Condition 2.10 (iii) where the night roosts are located. Moreover, noise mitigation measures as mentioned in Section 3.8 of the approved EM&A Manual shall be strictly implemented.

However, in instances when night-time works will be inevitable, in addition to provision of noise barriers, measures such as use of low-noise technology and equipment; acoustic mats and enclosures as specified in the Noise Mitigation Measures Plan shall also be fully implemented as required by EP Condition 2.12 to minimize construction noise impacts on nearby night roosts.

4.2.2 Recommended Measure to Minimize Light Overspill

There shall be no construction works with PME within 100m from the night roost after 18:00 during wet season and after 17:30 during dry season as described in Section 7.3.11 of the approved EM&A Manual to prevent light glare from the construction site to the nearby night roosts.

However, in instances when night-time works will be inevitable, directional down lighting and control of lighting periods and intensity shall be implemented as required by EP Condition 2.13 to minimize overspill of light to the roosting areas. All measures as recommended in the Proposal for Minimization of Overspill Light to Ecological Sensitive Area shall be fully implemented. No light glare shall illuminate towards the night roost areas and this shall be accomplished through preservation of Ficus microcarpa trees located at the Site boundary that shall act as barrier for light flow to the night roosts; and the establishment of noise barriers to also act as light barrier to roosting areas.