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   may to july 2022 Revision 2

Table of contents

 

1      Introduction.. 6

1.1.......... Scope of the Report 6

1.2.......... Structure of the Report 6

2.     Basic Project Information.. 8

2.1.......... Project Organization and Key Contact Personnel 8

2.2.......... Construction Programme. 8

3.     A Brief Summary of EM&A Requirements. 10

3.1.......... Monitoring Parameters. 10

3.2.......... Environmental Quality Performance Limits. 10

4.     Implementation Status. 14

4.1.......... Advice on the implementation status of environmental protection and pollution control/mitigation measures. 14

4.2.......... Environmental Mitigation Measures. 14

4.3.......... Environmental monitoring requirements and contractual requirements. 14

5.     Monitoring Results Analysis. 16

5.1.......... Noise Monitoring. 16

5.2.......... Water Quality Monitoring. 16

5.3            Ecological Impact Monitoring……………………………………………..16

5.4.......... Waste Management 16

6.     Complaints, Notification of Summons and Prosecution.. 18

7.     Comments and Recommendations. 20

8.     Conclusion.. 22

lIST OF TABLES

 

Table 2.1       Contact Details of Key Personnel

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 (May 2022 to July 2022)

Table 6.1  Summary of Complaints in the Reporting Period

Table 6.2       Cumulative Statistics on Complaints

Table 6.3       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 – May to July 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 May to 31 July 2022.  The cut-off date of reporting is at the end of each month within the reporting period.

 

      ii.        In the reporting period, 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) in May 2022 and Seven (7) noise monitoring stations (N12a, N12b, N13, N14, N16a, N16b and N17) started from June 2022 once per week in the reporting period.

     iv.        Examination was taken place at N17 – Bui O Public School from 14 to 19 July 2022, the limit level shall be adjusted to 65dB(A) during this period.

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

Water Quality Monitoring

     vi.        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. HDD casing works commenced on 30 May 2022.

    vii.        Water quality monitoring on 12 May 2022, 2 and 4 July 2022 was cancelled due to adverse weather.

   viii.        234 action level and 0 limit level exceedances on DO, 42 action level and 126 limit level exceedances on turbidity, 30 action level and 113 limit level exceedances on SS were recorded in the reporting period.

     ix.        Overall exceedances on turbidity and SS (i.e. SR4, SR15 downstream to the construction site during mid-ebb, SR5, SR6, SR9, SR10 and SR12 exceedances downstream to the construction site during mid-flood,) in the reporting month were referred to the 20% / 30% of control station criteria only whereas there were no exceedance as referred to 95%-ile / 99%-ile criteria, indicating that the exceedance is due to the localized water quality better than baseline range were captured at the control station whereas the impact station are still within the baseline ranges.

      x.        Co-related the monitoring dates with those days with recorded marine works activities, no marine dredging works were active during the reporting period.  Majority of recorded marine works activities were maintenance on working barge not in contact with water, except casing installation for marine HDD works on 28 June 2022 and 22 to 29 July 2022 within the replaced fully enclosed silt curtain.   Reviewed the overall work situation with limited marine works, it can be concluded that all the turbidity and SS exceedances were possibly due to natural runoff from streams to the sea as a result of frequent rainfall as recorded in the reporting period. (Heavy showers, rainstorm and squally thunderstorms from 10 to 16 May 2022 and from 25 to 31 May 2022, Amber rainstorm warning signal recorded on 12 May 2022; Amber and Red rainstorm warning signals recorded on 13 May 2022. Heavy showers, rainstorm and squally thunderstorms during 7-11 June 2022 and 14-16 June 2022, Amber rainstorm warning signal recorded on 7, 11, 14, 15 June 2022; Amber and Red rainstorm warning signals and waterspout near Cheung Chau 2022 recorded on 8 June 2022. Heavy showers, rainstorm and squally thunderstorms during 5-7 July 2022 and 16, 29 July 2022, Amber rainstorm warning signal recorded on 1 and 30 July 2022; tropical cyclone warning signals and strong monsoon signal recorded on 1-3 July 2022).

     xi.        Reviewing the “and“ approach, no exceedance in turbidity and SS would be recorded on adopting the ‘and’ criteria in the Action and Limit Level as proposed in submitted Baseline Monitoring Report.

    xii.        All action and limit level exceedances under “or” criteria as stated in the EM&A Manual were concluded as non-project related upon investigation.

Ecological Impact Monitoring

   xiii.        Transplanting works for plant species, Aquilaris sinensis, was completed on 26 April 2022. Maintenance works for trees in holding nursery have commenced.

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

    xv.        As per latest version of PTP, four tree found (1 no. of Aquilaria sinensis and 3 nos. of Gmelina chinensis) within the site of SSWSTW which are considered to be the plant species with conservative importance for temporarily transplanted to the nursery at Kam Tin and eventually be transplanted to Pui O Pumping Station.

Complaint log

   xvi.        One environmental complaint regarding the construction works was recorded in present quarter.

Notifications of Any Summons and Successful Prosecutions

  xvii.        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)	Mr. Derek Lo*	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. 

3.2.3       234 action level and 0 limit level exceedances on DO, 42 action level and 126 limit level exceedances on turbidity, 30 action level and 113 limit level exceedances on SS were recorded in the reporting period.

3.2.4       Overall exceedances on turbidity and SS (i.e. SR4, SR15 downstream to the construction site during mid-ebb, SR5, SR6, SR9, SR10 and SR12 exceedances downstream to the construction site during mid-flood,) in the reporting month were referred to the 20% / 30% of control station criteria only whereas there were no exceedance as referred to 95%-ile / 99%-ile criteria, indicating that the exceedance is due to the localized water quality better than baseline range were captured at the control station whereas the impact station are still within the baseline ranges.

3.2.5       Checked with contractor and RSS on the marine works activities during water Quality         monitoring in the reporting period, the following activities were recorded:

 

•   3/5/2022 - Cut off pipe pile of steel platform, Maintain silt curtain around marine platform

•   5/5/2022 - Weld safety fence on steel platform; Maintain silt curtain around marine platform

•   10/5/2022 - Working barge mobilized to site

•   25/5/2022 - Assemble and install steel casing for HDD works on the board

•   27/5/2022 - General site housekeeping (general cleansing on the board)

•   30/5/2022 - Install steel casing for HDD works to seabed

•   31/5/2022 - General site housekeeping (general cleansing on the board)

•   2/6/2022 - Preparation works for assembling and installing steel casing

•   4/6/2022 - Machine maintenance on working boat

•   7/6/2022 - Preparation works for installing mud pump; Machine maintenance on working   boat

•   11/6/2022 - Installing mud jar on working boat

•   13/6/2022 - Machine maintenance on working boat

•   15/6/2022 - Machine maintenance on working boat; Preparation works for connection between mud pump and tank

•   17, 22, 24/6/2022 - Appliance maintenance on working boat

•   28/6/2022 - Appliance maintenance on working boat; Casing installation for marine HDD works

•   6 - 20/7/2022 - No activity

•   22 - 29/7/2022 - Appliance maintenance on working barge and casing installation for marine HDD works

 

3.2.6       Co-related the monitoring dates with those days with recorded marine works activities, no marine dredging works were active during the reporting period.  Majority of recorded marine works activities were maintenance on working barge not in contact with water, except casing installation for marine HDD works on 28 June 2022 and 22 to 29 July 2022 within the replaced fully enclosed silt curtain.   Reviewed the overall work situation with limited marine works, it can be concluded that all the turbidity and SS exceedances were possibly due to natural runoff from streams to the sea as a result of frequent rainfall as recorded in the reporting period. (Heavy showers, rainstorm and squally thunderstorms from 10 to 16 May 2022 and from 25 to 31 May 2022, Amber rainstorm warning signal recorded on 12 May 2022; Amber and Red rainstorm warning signals recorded on 13 May 2022. Heavy showers, rainstorm and squally thunderstorms during 7-11 June 2022 and 14-16 June 2022, Amber rainstorm warning signal recorded on 7, 11, 14, 15 June 2022; Amber and Red rainstorm warning signals and waterspout near Cheung Chau 2022 recorded on 8 June 2022. Heavy showers, rainstorm and squally thunderstorms during 5-7 July 2022 and 16, 29 July 2022, Amber rainstorm warning signal recorded on 1 and 30 July 2022; tropical cyclone warning signals and strong monsoon signal recorded on 1-3 July 2022).

3.2.7       Reviewing the “and“ approach, no exceedance in turbidity and SS would be recorded on adopting the ‘and’ criteria in the Action and Limit Level as proposed in submitted Baseline Monitoring Report.

3.2.8       All action and limit level exceedances under “or” criteria as stated in the EM&A Manual were concluded as non-project related upon investigation.

3.2.9       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

3.2.10    Transplanting works for plant species, Aquilaris sinensis, was completed on 26 April 2022. Maintenance works for trees in holding nursery have commenced.

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

3.2.12    As per latest version of PTP, four tree found (1 no. of Aquilaria sinensis and 3 nos. of Gmelina chinensis) within the site of SSWSTW which are considered to be the plant species with conservative importance for temporarily transplanted to the nursery at Kam Tin and eventually be transplanted to Pui O Pumping Station.

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
	GW-RS0428-22	26 May 2022	29-05-2022 to 28-11-2022	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) in May 2022 and Seven (7) noise monitoring stations (N12a, N12b, N13, N14, N16a, N16b and N17) started from June 2022 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       Monitoring of maintenance works for the transplanted plant species was conducted at the holding nursery while in the reporting period.

5.3.3       As per latest version of PTP, four tree found (1 no. of Aquilaria sinensis and 3 nos. of Gmelina chinensis) within the site of SSWSTW which are considered to be the plant species with conservative importance for temporarily transplanted to the nursery at Kam Tin and eventually be transplanted to Pui O Pumping Station.

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 (May 2022 to July 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)	0.23849	6.61143
Metals (in ‘000kg)	0.00330	1.56500
Paper / Cardboard Packing (in ‘000kg)	0.06700	0.13748
Plastics (in ‘000kg)	0.00360	0.01406
Chemical Wastes (in ‘000kg)	0	0
General Refuses (in ‘000kg)	68.66	344.77
*: Further breakdown into sub-group if considered applicable;

 

6.      Complaints, Notification of Summons and Prosecution

6.        

6.0.        

6.1.1       One environmental complaint, notification of summons and successful prosecution regarding construction works was recorded in present quarter.

Table 6.1  Summary of Complaints in the Reporting Period

 

6.1.2       Cumulative statistic on complaints and successful prosecutions are summarized in Table 6.2 and Table 6.3 respectively.

Table 6.2 Cumulative Statistics on Complaints

Reporting Period	No. of Complaints
May 2022 - July 2022	1
Project commencement to the end of last reporting quarter	0
Total	1

 

Table 6.3 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 period, 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:

·         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 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;

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

·         Regular water spraying on drilling and excavation works for dust control; and

·         Proper waste handling, recycling and storage.

 

·         To inspect the condition of silt curtains on regular basis, and after adverse weather including any rainstorms and typhoons in wet season.

·         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;

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

·         Regular water spraying on drilling and excavation works for dust control; and

·         Proper waste handling, recycling and storage.

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.

8.2.2       234 action level and 0 limit level exceedances on DO, 42 action level and 126 limit level exceedances on turbidity, 30 action level and 113 limit level exceedances on SS were recorded in the reporting period.

8.2.3       Overall exceedances on turbidity and SS (i.e. SR4, SR15 downstream to the construction site during mid-ebb, SR5, SR6, SR9, SR10 and SR12 exceedances downstream to the construction site during mid-flood,) in the reporting month were referred to the 20% / 30% of control station criteria only whereas there were no exceedance as referred to 95%-ile / 99%-ile criteria, indicating that the exceedance is due to the localized water quality better than baseline range were captured at the control station whereas the impact station are still within the baseline ranges.

8.2.4       Co-related the monitoring dates with those days with recorded marine works activities, no marine dredging works were active during the reporting period.  Majority of recorded marine works activities were maintenance on working barge not in contact with water, except casing installation for marine HDD works on 28 June 2022 and 22 to 29 July 2022 within the replaced fully enclosed silt curtain.   Reviewed the overall work situation with limited marine works, it can be concluded that all the turbidity and SS exceedances were possibly due to natural runoff from streams to the sea as a result of frequent rainfall as recorded in the reporting period.

8.2.5       Reviewing the “and“ approach, no exceedance in turbidity and SS would be recorded on adopting the ‘and’ criteria in the Action and Limit Level as proposed in submitted Baseline Monitoring Report.

8.2.6       All action and limit level exceedances under “or” criteria as stated in the EM&A Manual were concluded as non-project related upon investigation.

 

8.3  Ecological Impact Monitoring

8.3.1       Transplanting works for plant species, Aquilaris sinensis, was completed on 26 April 2022. Maintenance works for trees in holding nursery have commenced.

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

8.3.3       As per latest version of PTP, four tree found (1 no. of Aquilaria sinensis and 3 nos. of Gmelina chinensis) within the site of SSWSTW which are considered to be the plant species with conservative importance for temporarily transplanted to the nursery at Kam Tin and eventually be transplanted to Pui O Pumping Station.

 

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