CONTRACT NO: SD 6/2020   Construction of San Shek Wan Sewage Treatment Works, Associated Submarine Outfall and Pui O Sewerage Works   Under Environmental Permit no. EP-538/2017   quarterly Environmental Monitoring & Audit summary Report   February to april 2022 Revision 2

Table of contents

 

1      Introduction.. 5

1.1.......... Scope of the Report 5

1.2.......... Structure of the Report 5

2.     Basic Project Information.. 7

2.1.......... Project Organization and Key Contact Personnel 7

2.2.......... Construction Programme. 7

3.     A Brief Summary of EM&A Requirements. 9

3.1.......... Monitoring Parameters. 9

3.2.......... Environmental Quality Performance Limits. 9

4.     Implementation Status. 11

4.1.......... Advice on the implementation status of environmental protection and pollution control/mitigation measures. 11

4.2.......... Environmental Mitigation Measures. 11

4.3.......... Environmental monitoring requirements and contractual requirements. 11

5.     Monitoring Results Analysis. 13

5.1.......... Noise Monitoring. 13

5.2.......... Water Quality Monitoring. 13

5.3            Ecological Impact Monitoring……………………………………………..13

5.4.......... Waste Management 13

6.     Complaints, Notification of Summons and Prosecution.. 15

7.     Comments and Recommendations. 16

8.     Conclusion.. 18

lIST OF TABLES

 

Table 2.1     Contact Details of Key Personnel

Table 3.1   Action and Limit Levels of Water Quality

Table 4.1     Summary of submission status under EP-538/2017

Table 4.2     Summary of the current status on licences and/or permits on environmental protection pertinent to the Project

Table 5.1     Summary of Quantities of Waste Material (February 2022 to April 2022)

Table 6.1     Cumulative Statistics on Complaints

Table 6.2     Cumulative Statistics on Successful Prosecutions

Table 7.1     Construction Activities in Past 3 Months

 

 

lIST OF FIGUREs

Figure 2.1    Project Organization Chart

Figure 2.2    Master Layout Plan

Figure 5.1   Locations of Noise Monitoring Station

Figure 5.2   Locations of Water Quality Monitoring Stations

 

 

lIST OF APPENDIces

 

Appendix 5.1    Noise Monitoring Graphical Presentations

Appendix 5.2   Marine Water Quality Monitoring Graphical and Summary of Exceedance Presentations

Appendix 5.3    Quarterly Summary Waste Flow Table

 

 

EXECUTIVE SUMMARY

       i.        This is the Quarterly Environmental Monitoring and Audit (EM&A) Summary Report – February to April 2022 of Outlying Islands Sewerage Stage 2 – South Lantau Sewerage Works under Environmental Permit no. EP-538/2017 (Hereafter as “the Project”).  The construction works of the Project was commenced on 3 November 2021 and the tentative completion date is Q1 2026.  The Quarterly EM&A Summary Report presents the environmental monitoring findings and information recorded during the period of 01 February to 30 April 2022.  The cut-off date of reporting is at the end of each month within the reporting period.

 

      ii.        In the reportingperiod, the principal work activities conducted are as follow:

 

Exceedances of Action/Limit Levels

Noise Monitoring

     iii.        Noise monitoring was conducted at five (5) noise monitoring stations N12a, N12b, N13, N14 and N17 once per week in the reporting period.

     iv.        No action and limit level exceedances were recorded in construction noise level in the reporting period.

Water Quality Monitoring

      v.        Marine-based construction works commenced on 19 April 2022. Water quality monitoring was conducted at nine (9) monitoring stations (seven impact & two control stations) three days per week in the reporting period starting from 12 April 2022. 66 action level exceedances on dissolved oxygen (DO), 4 action level and 81 limit level exceedances on turbidity, 2 action level and 49 limit level exceedances on SS were recorded in the reporting period.

     vi.        Out of 66 action level exceedances on DO, 61 of these exceedances were due to background contribution as recorded at the control stations on 14, 16, 18, 20, 22 and 29 April 2022 whereas action level exceedance on DO recorded at SR9 and SR10 on 27 April 2022 were reviewed with no exceedance recorded at nearby upstream stations SR5 and SR6 from the location of marine-based construction works and concluded as non-project related.

    vii.        Out of the 4 action level and 81 limit level exceedances on turbidity, 2 action level and 49 limit level exceedances on SS were recorded in the reporting month, 4 action level exceedances on SS were concluded after removing those false alarm exceedance using the “and“ approach proposed in the baseline report.  Action level exceedance on SS recorded on 27 April 2022 was reviewed with no exceedance recorded at nearby upstream stations SR5 and SR6 from the location of marine-based construction works and concluded as non-project related.

   viii.        All action and limit level exceedances were concluded as non-project related upon investigation.

Ecological Impact Monitoring

     ix.        Transplanting works for plant species, Aquilaris sinensis, was completed on 26 April 2022.

      x.        Monitoring of maintenance works for the transplanted plant species was conducted at the holding nursery while in the reporting period.

     xi.        Monitoring of the in-situ preserved plant species was conducted on site in the event of site inspections carried out in the reporting period.

Complaint log

    xii.        No environmental complaint regarding the construction works was recorded in present quarter.

Notifications of Any Summons and Successful Prosecutions

   xiii.        No environmental notification of any summons and successful prosecution regarding the construction works was recorded in present quarter.

 

1      Introduction

1.1          Scope of the Report

1.1.1.     Lam Environmental Services Limited (LES) has been appointed to work as the Environmental Team (ET) under Environmental Permit (EP) no. EP-538/2017 to implement the Environmental Monitoring and Audit (EM&A) programme as stipulated in the EM&A Manual of the approved Environmental Impact Assessment (EIA) Report for Outlying Islands Sewerage Stage 2 - South Lantau Sewerage Works (Register No.: AEIAR-210/2017).

1.1.2.     The Quarterly EM&A Summary Report was prepared according to Section 12.3 of the Project EM&A Manual.

1.2          Structure of the Report

Section 1        Introduction – details the scope and structure of the report

 

Section 2        Basic Project Information – a synopsis of project organization, programme contacts of key management, and a synopsis of work undertaken in the reporting period.

           

Section 3        A Brief Summary of EM&A requirements – including monitoring parameters, environmental quality performance limits (Action and Limit levels); and environmental mitigation measure, as recommended in the EIA Report.

                      

Section 4        Implementation Status – Advice on the implementation status of environmental protection and pollution control/mitigation measures, as recommended in the EIA Report and summarised in the updated implementation schedule.

 

Section 5        Monitoring Results Analysis – the trends of the monitoring parameters in present quarter; advice on the solid and liquid waste management status.

                      

Section 6        Summary of Non-Compliance (exceedances) of the environmental quality performance limits, Complaints, Notification of Summons and Successful Prosecutions

A brief review of the reasons for and the implications of non-compliance and a summary description of the actions taken and any follow-up procedures related to earlier non-compliance.

A summary record of all complaints received (written or verbal) for each media, liaison and consultation undertaken, actions and follow-up procedures taken;

A summary record of notifications of summons and successful prosecutions for breaches of the current environmental protection/pollution control legislations, including locations and nature of the breaches, investigation, follow-up actions taken and results.

                      

Section 7        Comments and Recommendations – such as effectiveness and efficiency of the mitigation measures, improvement in the EM&A programme, if any.

 

Section 8        Conclusion and Project Proponent’s contacts and hotline telephone number for the public to make enquiries

2.         Basic Project Information

2.1          Project Organization and Key Contact Personnel

2.1.1       Drainage Services Department is the overall project controllers for the Project. For the construction phase of the Project, Contractor(s), Environmental Team and Independent Environmental Checker are appointed to manage and control environmental issues.  Key personnel and contact particulars are summarised in Figure 2.1 and Table 2.1:

Table 2.1 Contact Details of Key Personnel

Party	Role	Post	Name	Contact No.	Contact Fax
Drainage Services Department (DSD)	The Engineer for the Contract	Engineer	Mr. Silas Chan	2594 7272	3104 6426
Binnies Hong Kong Limited	Engineer’s Representative	Resident Engineer	Mr. Clarence Chak	6428 5532	-
Kwan Lee – Chun Wo Joint Venture	Contractor	Site Agent	Mr. Charles Tse	9270 3384	2744 6937
		Environmental Officer	Ms. Shirley Kong	5162 5933
SMEC Hong Kong	Independent Environmental Checker (IEC)	Independent Environmental Checker (IEC)	Ms. Kitty Lee	3995 8140	3995 8101
Lam Environmental Services Limited	Environmental Team (ET)	Environmental Team Leader (ETL)	Ms. Melody Cheng*	2882 3939	2882 3331

Notes: *Environmental Team Leader (ETL) change from Ms. Melody Cheng to Mr. Derek Lo start from July 2022

2.2          Construction Programme

2.2.1       The proposed sewerage works will collect the sewage generated from the unsewered areas of Shui Hau, Tong Fuk, Cheung Sha, San Shek Wan, Pui O and Ham Tin in South Lantau (i.e. within the Project Catchment Area) and convey it to a proposed sewage treatment works at San Shek Wan for treatment and disposal into outer bay of Pui O/ Chi Ma Wan via a submarine outfall.

2.2.2       The entire Project are divided into three contracts. Contract No. DC/2020/20 (the Contract) would have the following implementations as demonstrated in Figure 2.2.

2.2.3       The major components of the Project under Environmental Permit (EP) (EP No. EP-538/2017) comprises: (i) construction of sewage treatment works at San Shek Wan (SSWSTW) and associated submarine outfall; (ii) construction of sewage pumping station at Pui O (POSPS); (iii) village sewage works at Pui O; and (iv) trunk sewers and rising mains on carriageways.

 

3.      A Brief Summary of EM&A Requirements

3.1  Monitoring Parameters

Noise Monitoring

3.1.1       The construction noise level shall be measured in terms of the A-weighted equivalent continuous sound pressure level (L_eq). L_eq (30min) should be used as the monitoring parameter. Supplementary information for data auditing, statistical results such as L₁₀ and L₉₀ shall also be obtained for reference.

3.1.2       For impact monitoring for construction of village sewers / rising main, noise monitoring should be undertaken on weekly basis.  One set of L_eq (30min) noise level as six consecutive L_eq (5min) between 07:00-19:00 hours on normal weekdays.

Water Quality Monitoring

3.1.3       In construction phase, the levels of dissolved oxygen (DO), temperature, turbidity and salinity should be measured in-situ while suspended solids (SS) is determined by laboratory analysis.

Ecological Impact Monitoring

3.1.4       Monitoring in the form of regular site inspections should be carried out to ensure ecological measures in the form of tree transplantation and establishment are being implemented and effective for plant species of conservation importance (e.g. Aquilaria sinensis).

3.2  Environmental Quality Performance Limits

Noise Monitoring

3.2.1       No action and limit level exceedances were recorded in construction noise level in the reporting period.

Water Quality Monitoring

3.2.2       Marine-based construction works had been commenced since 19 April 2022, marine water quality monitoring was initialised since 12 April 2022.  66 action level exceedances on DO; four (4) action level and 81 limit level exceedances on turbidity; and two (2) action level and 49 limit level exceedances on SS were recorded in the reporting period.

3.2.3       Out of 66 action level exceedances on DO, 61 of these exceedances were due to background contribution as recorded at the control stations on 14, 16, 18, 20 and 29 April 2022 whereas action level exceedances on DO recorded at SR9 and SR10 on 27 April 2022 were reviewed with no exceedances recorded at nearby upstream stations SR5 and SR6 from the location of marine-based construction works and concluded as non-project related.

3.2.4       Out of the four (4) action level and 81 limit level exceedances on turbidity; and two (2) action level and 49 limit level exceedances on SS were recorded in the reporting period, four (4) action level exceedances on SS were concluded after removing those false alarm exceedances using the “and” approach proposed in the Baseline Monitoring Report.  Action level exceedance on SS on 27 April 2022 was reviewed with no exceedances recorded at nearby upstream stations SR5 and SR6 from the location of marine-based construction works and concluded as non-project related.

3.2.5       Water quality monitoring is evaluated against Action and Limit Levels. Note that derived Action and Limit Level was proposed in Baseline Monitoring Report for approval. Action and Limit Levels of marine water quality monitoring have been set with reference to the EM&A Manual criteria and derived criteria as shown in Table 3.1 below.

Table 3.1     Action and Limit Levels of Water Quality

Notes (with proposed amendments in AL/LL in underlined text):

A. “Depth-averaged” is calculated by taking the arithmetic means of reading of all three depths.

B.  For DO, non-compliance of the water quality limits occurs when monitoring result is lower than the limits.

C.  For SS and turbidity, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.

D. Action Level and Limit Level with 95%-ile / 99%-ile derived from baseline data “and” 20% / 30% exceedance of control station proposed in Baseline Monitoring Report.

Ecological monitoring

3.2.6       Monitoring of maintenance works for the transplanted plant species was conducted at the holding nursery while in the reporting period.

Monitoring of the in-situ preserved plant species was conducted on site in the event of site inspections carried out in the reporting period.

4.      Implementation Status

4.1  Advice on the implementation status of environmental protection and pollution control/mitigation measures

4.1.1       Mitigation measures according to the environmental mitigation implementation schedule in Annex A of EM&A Manual were generally implemented by the Contractor.  Hence, the EM&A programme was considered effective and shall be maintained.               

4.2  Environmental Mitigation Measures

4.2.1       Environmental mitigation measures mentioned the EIA Report were weekly reviewed and recorded in Weekly Environmental Site Audit Checklist.  Also, a summary of the submission status of the reporting quarter on submissions and measures mentioned in Environmental Permit (EP-538/2017) are shown in Table 4.1.

Table 4.1 Summary of submission status under EP-538/2017

4.3  Environmental monitoring requirements and contractual requirements

4.3.1       A summary of the submission status for the reporting period on licences and/or permits on environmental protection pertinent to the Project is shown in Table 4.2.

Table 4.2 Summary of the current status on licences and/or permits on environmental protection pertinent to the Project

Permits and/or Licences	Permit. No. / Account No.	Issued Date	Valid Period & Expiry Date (dd-mm-yyyy to dd-mm-yyyy)	Status
Notification Pursuant to Section 3(1) of Air Pollution Control (Construction Dust) Regulation	466408	14 Apr 2021	N/A	Valid
Wastewater Discharge Licence under Water Pollution Control Ordinance	SSWSTW: WT00039636-2021	30 Dec 2021	30-12-2021 to 31-12-2026	Valid
	POPS: WT00039820-2021	31 Dec 2021	31-12-2021 to 31-12-2026	Valid
Billing Account under Waste Disposal (Charges for Disposal of Construction Waste) Regulation	Account No.: 7040411	05 May 2021	N/A	Valid
Registration as Chemical Waste Producer under Waste Disposal (Chemical Waste) (General) Regulation	WPN 0000-931-K3428-01	13 May 2021	N/A	Valid
Construction Noise Permit under Noise Control Ordinance	GW-RS0921-21	26 Nov 2021	29-11-2021 to 28-05-2022	Valid

  Note: Only include those valid or under application; fill in “N/A” for non-applicable item(s).

 

 

3.1. 

5.      Monitoring Results Analysis

5.1    Noise Monitoring

5.1.1       Noise monitoring was conducted at five (5) noise monitoring stations N12a, N12b, N13, N14 and N17 once per week in the reporting period.

5.1.2       Noise monitoring location plans with sensitive receivers are shown in Figure 5.1.

5.1.3       Noise monitoring results measured in the reporting period were reviewed and summarised.  Noise monitoring graphical presentation can be referred to Appendix 5.1.

5.1.4       No action and limit level exceedances were recorded in construction noise level in the reporting period.

5.2    Marine Water Quality Monitoring

5.2.1       Marine Water quality monitoring involves nine (9) monitoring stations (seven impact & two control stations) three days per week in the reporting period starting from 12 April 2022.

5.2.2       Marine Water monitoring location plans with sensitive receivers are shown in Figure 5.2.

5.2.3       Marine Water quality monitoring results measured in the reporting period were reviewed and summarised.  Marine water quality monitoring graphical presentation and the summary of exceedance of action and /limit levels of WQM based on “OR” criteria (criteria according to EM&A Manual), but no exceedance if it is based on the “AND” criteria proposed in Baseline Monitoring Report can be referred to Appendix 5.2.

5 

 

5.3    Ecological Impact Monitoring

5.3.1       Transplanting of the trees of Aquilaris sinensis was completed on 26 April 2022. Maintenance works for trees in holding nursery have commenced.

5.3.2       Preservation of retain tree of Aquilaris sinensis on Project Site.

6 

 

5.4       Waste Management

5.4.1       The quantities of waste for disposal in present quarter are summarized in Table 5.1. The Quarterly Summary Waste Flow Table is shown in Appendix 5.3.

 

Table 5.1 Summary of Quantities of Waste Material (February 2022 to April 2022)

Waste Type	Quantity for reporting quarter	Cumulative Quantity-to-Date
Hard Rock and Large Broken Concrete (Inert) (in ‘000m3)	0	0
Reused in this Contract (Inert) (in ‘000m3)	0	0
Reused in other Projects (Inert) (in ‘000m3)	0	0
Disposal as Public Fill (Inert) (in ‘000m3)	5.50608	6.37295
Metals (in ‘000kg)	1.55450	1.56170
Paper / Cardboard Packing (in ‘000kg)	0.04600	0.07048
Plastics (in ‘000kg)	0.00350	0.01046
Chemical Wastes (in ‘000kg)	0	0
General Refuses (in ‘000kg)	97.16	276.11
*: Further breakdown into sub-group if considered applicable; *: Please also provide daily dumping report for our records. *: Delete as appropriate

 

6.      Complaints, Notification of Summons and Prosecution

6.        

6.0.        

6.1.1       No environmental complaint, notification of summons and successful prosecution regarding construction works was recorded in present quarter.

6.1.2       Cumulative statistic on complaints and successful prosecutions are summarized in Table 6.1 and Table 6.2 respectively.

Table 6.1 Cumulative Statistics on Complaints

Reporting Period	No. of Complaints
February 2022 - April 2022	0
Project commencement to the end of last reporting month	-
Total	0

 

Table 6.2 Cumulative Statistics on Successful Prosecutions

Environmental Parameters	Cumulative No. Brought Forward	No. of Successful Prosecutions this month (Offence Date)	Cumulative No. Project-to-Date
Air	-	0	0
Noise	-	0	0
Water	-	0	0
Waste	-	0	0
Other	-	0	0
Total	-	0	0

 

7.      Comments and Recommendations

7.        

7.0.        

7.1.1       In the reporting months, the principal work activities conducted are as follow.

Table 7.1 Construction Activities in Past 3 Months

 

7.1.2       The recommended mitigation measures for the past 3 months are listed below:

·         Ensure the transplanting of the trees including Aquilaris sinensis and their establishment are not affected by any unacceptable construction works;

·         Implementation of proper noise pollution control;

·         Dust control during dust generating works;

·         Adopt surface drainage and sediment control facilities for sewage installation in village and public roads;

·         Regular water spraying on exposed area;

·         Proper waste handling, recycling and storage.

·         Provide caring measures for the health, form and structural conditions for transplant trees including Aquilaris sinensis in holding nursery;

·         Fully implement tree preservation works on site and holding nursery to ensure compliance of relevant legislation and guidelines stated in EM&A Manual.

·         Implementation of proper noise pollution control including use of QPME;

·         Dust control during dust generating works;

·         Adopt surface drainage and sediment control facilities for sewage installation in village and public roads;

·         Vehicle wheel-washing and body washing facilities should be provided at the site entrance;

·         Silt curtains should be installed to surround the marine dredging area and HDD pilot hole exist area

·         Implementation of noise pollution control in accordance with Construction Noise Mitigation Plan;

·         Dust control during dust generating works;

·         Adopt surface drainage and sediment control facilities for sewage installation in village and public roads;

·         Adopt temporary drainage and sediment control facilities on Site;

·         Silt curtains should be installed to surround the marine dredging area in accordance with Silt Curtain Deployment Plan.

The implemented mitigation measures are considered effective.

 

 

 

8.      Conclusion

8.1  Noise Monitoring.

8.1.1       No action or limit level exceedance was recorded in construction noise level in this present quarter.

 

8.2  Water Quality Monitoring

8.2.1       Marine-based construction works commenced on 19 April 2022, water quality monitoring was commenced on 12 April 2022. 66 action level exceedances on DO, 4 action level and 81 limit level exceedances on turbidity, 2 action level and 49 limit level exceedances on SS were recorded in the reporting period.

8.2.2       Out of 66 action level exceedances on DO, 61 of these exceedances were due to background contribution as recorded at the control stations on 14, 16, 18, 20, 22 and 29 April 2022 whereas action level exceedance on DO recorded at SR9 and SR10 on 27 April 2022 were reviewed with no exceedance recorded at nearby upstream stations SR5 and SR6 from the location of marine-based construction works and concluded as non-project related.

8.2.3       Out of the 4 action level and 81 limit level exceedances on turbidity, 2 action level and 49 limit level exceedances on SS were recorded in the reporting period, 4 action level exceedances on SS were concluded after removing those false alarm exceedance using the “and“ approach proposed in the baseline report. Action level exceedance on SS recorded on 27 April 2022 was reviewed with no exceedance recorded at nearby upstream stations SR5 and SR6 from the location of marine-based construction works and concluded as non-project related.

 

8.3  Ecological Impact Monitoring

8.3.1       Maintenance works for transplanted Aquilaris sinensis have commenced, preservation and protection of retain tree Aquilaris sinensis at SSWSTW.

 

8.4  Review of the Reasons for and the Implications of Non-compliance

8.4.1       No environmental non-compliance was recorded in present quarter.

 

8.5  Summary of action taken in the event of and follow-up on non-compliance

8.5.1       There was no particular action taken since no non-compliance was recorded in present quarter.

 

 

 

 

 

 

 

Figure 2.1

 

Project Organisation Chart

 

 

 

 

 

 

 

Figure 2.2

 

Master Layout Plan

 

 

 

 

 

 

 

 

Figure 5.1

 

Locations of Noise Monitoring Station

 

 

 

 

 

 

 

Figure 5.2

 

Locations of Water Quality Monitoring Stations

 

 

 

 

 

 

 

Appendix 5.1

 

Noise Monitoring Graphical Presentations

 

 

 

 

 

 

 

Appendix 5.2

 

Marine Water Quality Monitoring Graphical and Summary of Exceedance Presentations

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Appendix 5.3

 

Quarterly Summary Waste Flow Table