CONTRACT NO: SD 15/2022 Outlying Island Sewerage Stage 2 – South Lantau Sewage    Works – Environmental Team Services (2023 – 2024)   Under Environmental Permit no. EP-538/2017   quarterly Environmental Monitoring & Audit summary Report   August to october 2023 Revision 1

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……………………………………………..19

5.4.......... Waste Management 19

6.     Complaints, Notification of Summons and Prosecution.. 20

7.     Comments and Recommendations. 22

8.     Conclusion.. 24

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 (August, September and October 2023)

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 – August to October 2023 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 August to 31 October 2023.  

 

      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 eight (8) noise monitoring stations (N12a, N12b, N13, N14, N15b, N16a, N16b and N17) once per week in the reporting period.

     iv.        No school examination was taken place at N17 – Bui O Public School in the reporting 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 1 and 8 September 2023 were cancelled due to Typhoon Signal no. 8 and Black Rainstorm Signal respectively. Water quality monitoring on 7, 9 and 18 Oct 2023 were cancelled due to Strong Wind Signal no. 8, no. 3 and Strong Monsoon Signal respectively. No substitution would be arranged for such cancellation since it is impossible to maintain the monitoring frequency as three times a week for the event of marine water quality monitoring cancellation in between time with respect to the fact that not less than 36 hours interval shall be followed for two monitoring days as required by the EM&A Manual Clause 5.1.6 (b) for the project.

   viii.        In accordance with the action level and limit level in Baseline Monitoring Report Rev. 9.2 agreed by EPD on 2 September 2022, 15 action level and 0 limit level exceedances was recorded in the reporting period. 1 Action Level exceedance on SS during flood tide on 9 August 2023 was recorded; 3 action level exceedances on turbidity and SS during ebb tide on 20 October 2023 were recorded; 2 action level exceedances on turbidity and 4 action level exceedances on SS during flood tide were recorded on 23 October 2023, 1 action level exceedances on turbidity and SS during ebb tide was recorded on 23 October 2023. It can be concluded that the turbidity and SS exceedances were possibly due to natural runoff from streams to the sea or sudden changed of water body in the reporting period and non-project related.    

 

Ecological Impact Monitoring

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

      x.        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.

     xi.        The weekly site audit was carried out by ET include checking whether good site practices are being properly implemented by the Contractor.

    xii.        The extent of the work site boundaries was checked by the ET during the weekly site audit.

   xiii.        The retained tree (T035) Dalbergia assamica(南嶺黃檀) located within the site boundary of the Construction of San Shek Wan Sewage Treatments Works was collapsed on 2 Sep 2023 afternnon after typhoon “Saola”( Signal No.10). No injury and significant damage were caused in the tree collapse incident. To minimize obstruction to the public, the tree were subsequently sawn and removed. Incident report for this case has been provided by the Contractor on 11 October 2023.  

 

Complaint log

   xiv.        No environmental complaint regarding the construction works was recorded in the reporting period..

 

Notifications of Any Summons and Successful Prosecutions

    xv.        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. Kevin Chan	3529 3013	-
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

 

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       To support water quality monitoring, the silt curtain deployment plan has minor updates to include an additional brand of geosynthetic material as alternative for selection and adopt underwater robot for inspecting condition of silt curtain.

3.2.4       Water quality monitoring on 1 and 8 September 2023 were cancelled due to Typhoon Signal no. 8 and Black Rainstorm Signal respectively. Water quality monitoring on 7, 9 and 18 October 2023 were cancelled due to Strong Wind Signal no. 8, no. 3 and Strong Monsoon Signal respectively. No substitution would be arranged for such cancellation since it is impossible to maintain the monitoring frequency as three times a week for the event of marine water quality monitoring cancellation in between time with respect to the fact that not less than 36 hours interval shall be followed for two monitoring days as required by the EM&A Manual Clause 5.1.6 (b) for the project.

3.2.5       Water quality monitoring is evaluated against Action and Limit Levels. The derived Action and Limit Level proposed in Baseline Monitoring Report Rev. 9.2 was agreed by EPD on 2 September 2022. Action and Limit Levels of marine water quality monitoring have been set with reference to the 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.

3.2.6       In accordance with the action level and limit level in Baseline Monitoring Report Rev. 9.2 agreed by EPD on 2 September 2022, no action and limit level exceedance was recorded in September 2023. 15 action level and 0 limit level exceedances was recorded in the reporting period. 1 Action Level exceedance on SS during flood tide on 9 August 2023 was recorded; 3 action level exceedances on turbidity and SS during ebb tide on 20 October 2023 were recorded; 2 action level exceedances on turbidity and 4 action level exceedances on SS during flood tide were recorded on 23 October 2023, 1 action level exceedances on turbidity and SS during ebb tide was recorded on 23 October 2023. It can be concluded that the turbidity and SS exceedances were possibly due to natural runoff from streams to the sea or sudden changed of water body in the reporting period and non-project related.

3.2.7       Checked with contractors and RSS on the marine works activities in the reporting period, the following activities were recorded:

Date	Marine-based construction activities undertaken	Mitigation measures implemented
2/8/2023	No activity	Nil
4/8/2023	No activity	Nil
7/8/2023	No activity	Nil
9/8/2023	No activity	Nil
11/8/2023	No activity	Nil
14/8/2023	No activity	Nil
16/8/2023	Pilot hole reaming works	Working area was enclosed by silt curtain.
18/8/2023	Pilot hole reaming works	Working area was enclosed by silt curtain.
21/8/2023	Pilot hole reaming works	Working area was enclosed by silt curtain.
23/8/2023	Tripping out works for marine HDD2 works	Working area was enclosed by silt curtain.
25/8/2023	Tripping out works for marine HDD2 works	Working area was enclosed by silt curtain.
28/8/2023	Smoothing for marine HDD2 works	Working area was enclosed by silt curtain.
30/8/2023	Smoothing for marine HDD2 works	Working area was enclosed by silt curtain.
1/9/2023	No activities	N/A
4/9/2023	No activities	N/A
6/9/2023	No activities	N/A
8/9/2023	No activities	N/A
11/9/2023	Repair silt curtain	Remove debris on the barges.
13/9/2023	Smoothing for marine HDD2 works	Working area was enclosed by silt curtain.
15/9/2023	Smoothing for marine HDD2 works	Working area was enclosed by silt curtain.
18/9/2023	Smoothing for marine HDD2 works	Working area was enclosed by silt curtain.
20/9/2023	Smoothing for marine HDD2 works	Working area was enclosed by silt curtain.
22/9/2023	Smoothing for marine HDD2 works	Working area was enclosed by silt curtain.
25/9/2023	Pull out drill pipe for marine HDD2 works	Working area was enclosed by silt curtain.
27/9/2023	Repair drilling rig	Remove debris on the barge.
29/9/2023	Trip in at sea side for marine HDD2 works	Working area was enclosed by silt curtain.
3/10/2023	Push in drill pipe	Working area was enclosed by silt curtain.
5/10/2023	No activities	Nil
7/10/2023	No activities	Nil
11/10/2023	Push in drill pipe	Working area was enclosed by silt curtain.
13/10/2023	Push in drill pipe	Working area was enclosed by silt curtain.
16/10/2023	Maintenance	Remove debris on the barges.
20/10/2023	Smoothening	Working area was enclosed by silt curtain.
23/10/2023	Holiday	Nil
25/10/2023	Smoothening	Working area was enclosed by silt curtain.
27/10/2023	Smoothening	Working area was enclosed by silt curtain.
30/10/2023	Smoothening	Working area was enclosed by silt curtain.

 

3.2.8       Co-related the monitoring dates with those days with recorded marine works activities, no marine dredging works were active during the reporting period.

3.2.9       For the exceedances recorded in August 2023, no marine works during 17 July 2023 to 11 Aug 2023 due to the silt curtain was found broken after Typhoon No. 8 on 17 July 2023 and repaired on 12 August 2023. No exceedance was recorded on same day during ebb tide from 07:13 to 07:16 and in the subsequent monitoring on 11 August 2023 both ebb and flood tide.

3.2.10    For the exceedances recorded in October 2023, smoothening works within enclosed silt curtain on 20 October 2023. Higher turbidity was recorded (>10 NTU) at all stations including control stations during ebb and flood tide. No exceedances was recorded in the subsequent monitoring at these stations on 23 Oct 2023, No marine works conducted on 23 October 2023. No exceedances was recorded in the subsequent monitoring at these stations on 25 Oct 2023.

3.2.11    Reviewed the overall work situation and the mitigation measures was implemented by the Contractor, it can be concluded that the turbidity and SS exceedances in the reporting period was possibly due to natural runoff from streams to the sea or sudden changed of water body.

Ecological monitoring

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

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

3.2.14    The retained tree (T035) Dalbergia assamica (南嶺黃檀) located within the site boundary of the Construction of San Shek Wan Sewage Treatment Works was collapsed on 2 Sep 2023 afternoon after typhoon “Saola” (Signal No. 10). Incident report for this case was provided by the Contractor on 11 October 2023. To minimize obstruction to the public, the collapsed tree has been removed and delivered to Y Park.

3.2.15    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	Status
Notification of Works Under APCO	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
	SSWSTW: Gravity Sewer & Raising Main: WT00042613-2022	09 Jan 2023	09-01-2023 to 31-01-2028	Valid
Billing account under Waste Disposal Ordinance	Account No.: 7040411	05 May 2021	N/A	Valid
Registration as a Chemical Waste Producer	0000-931-K3428-01	13 May 2021	N/A	Valid
Construction Noise Permit under Noise Control Ordinance for SSWSTW	GW-RS0039-23	20 Jan 2023	03-02-2023 to 02-08-2023	Expired on 02 Aug 2023
	GW-RS0657-23	9 Aug 2023	11-08-2023 to 08-02-2024	Valid
Construction Noise Permit under Noise Control Ordinance for POSPS	GW-RS0230-23	7 Mar 2023	27-03-2023 to 26-09-2023	Expired on 26 Sep 2023
	GW-RS0822-23	25 Sep 2023	27-09-2023 to 26-03-2024	Valid
Marine Dumping Permit (Dredged Sediment Requiring Type 1 – Open Sea Disposal	EP/MD/23-117	16 Oct 2023	17-10-2023 to 15-11-2023	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 eight (8) noise monitoring stations (N12a, N12b, N13, N14, N15b, N16a, N16b and N17) once per week in the reporting period.

5.1.2       No school examination was taken place at N17 – Bui O Public School in the reporting period.

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

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

5.1.5       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       Water quality monitoring is evaluated against Action and Limit Levels. The derived Action and Limit Level proposed in Baseline Monitoring Report Rev. 9.2 was agreed by EPD on 2 September 2022.

5.2.4       Water quality monitoring on 1 September 2023 and 8 September 2023 were cancelled due to Typhoon Signal no. 8 and Black Rainstorm Signal respectively. Water quality monitoring on 9 October 2023 and 18 October 2023 were cancelled due to Strong Wind Signal no. 8 and Strong Monsoon Signal respectively. No substitution would be arranged for such cancellation since it is impossible to maintain the monitoring frequency as three times a week for the event of marine water quality monitoring cancellation in between time with respect to the fact that not less than 36 hours interval shall be followed for two monitoring days as required by the EM&A Manual Clause 5.1.6 (b) for the project.

5.2.5       In accordance with the action level and limit level in Baseline Monitoring Report Rev. 9.2 agreed by EPD on 2 September 2022, 15 action level and 0 limit level exceedances was recorded in the reporting period. 1 Action Level exceedance on SS during flood tide on 9 August 2023 was recorded; 3 action level exceedances on turbidity and SS during ebb tide on 20 October 2023 were recorded; 2 action level exceedances on turbidity and 4 action level exceedances on SS during flood tide were recorded on 23 October 2023, 1 action level exceedances on turbidity and SS during ebb tide was recorded on 23 October 2023. It can be concluded that the turbidity and SS exceedances were possibly due to natural runoff from streams to the sea or sudden changed of water body in the reporting period and non-project related.

5.2.6       Checked with contractors and RSS on the marine works activities in the reporting period, the following activities were recorded:

Date	Marine-based construction activities undertaken	Mitigation measures implemented
2/8/2023	No activity	Nil
4/8/2023	No activity	Nil
7/8/2023	No activity	Nil
9/8/2023	No activity	Nil
11/8/2023	No activity	Nil
14/8/2023	No activity	Nil
16/8/2023	Pilot hole reaming works	Working area was enclosed by silt curtain.
18/8/2023	Pilot hole reaming works	Working area was enclosed by silt curtain.
21/8/2023	Pilot hole reaming works	Working area was enclosed by silt curtain.
23/8/2023	Tripping out works for marine HDD2 works	Working area was enclosed by silt curtain.
25/8/2023	Tripping out works for marine HDD2 works	Working area was enclosed by silt curtain.
28/8/2023	Smoothing for marine HDD2 works	Working area was enclosed by silt curtain.
30/8/2023	Smoothing for marine HDD2 works	Working area was enclosed by silt curtain.
1/9/2023	No activities	N/A
4/9/2023	No activities	N/A
6/9/2023	No activities	N/A
8/9/2023	No activities	N/A
11/9/2023	Repair silt curtain	Remove debris on the barges.
13/9/2023	Smoothing for marine HDD2 works	Working area was enclosed by silt curtain.
15/9/2023	Smoothing for marine HDD2 works	Working area was enclosed by silt curtain.
18/9/2023	Smoothing for marine HDD2 works	Working area was enclosed by silt curtain.
20/9/2023	Smoothing for marine HDD2 works	Working area was enclosed by silt curtain.
22/9/2023	Smoothing for marine HDD2 works	Working area was enclosed by silt curtain.
25/9/2023	Pull out drill pipe for marine HDD2 works	Working area was enclosed by silt curtain.
27/9/2023	Repair drilling rig	Remove debris on the barge.
29/9/2023	Trip in at sea side for marine HDD2 works	Working area was enclosed by silt curtain.
3/10/2023	Push in drill pipe	Working area was enclosed by silt curtain.
5/10/2023	No activities	Nil
7/10/2023	No activities	Nil
11/10/2023	Push in drill pipe	Working area was enclosed by silt curtain.
13/10/2023	Push in drill pipe	Working area was enclosed by silt curtain.
16/10/2023	Maintenance	Remove debris on the barges.
20/10/2023	Smoothening	Working area was enclosed by silt curtain.
23/10/2023	Holiday	Nil
25/10/2023	Smoothening	Working area was enclosed by silt curtain.
27/10/2023	Smoothening	Working area was enclosed by silt curtain.
30/10/2023	Smoothening	Working area was enclosed by silt curtain.

 

5.2.7       Co-related the monitoring dates with those days with recorded marine works activities, no marine dredging works were active during the reporting period.

5.2.8       For the exceedances recorded in August 2023, no marine works during 17 July 2023 to 11 Aug 2023 due to the silt curtain was found broken after Typhoon No. 8 on 17 July 2023 and repaired on 12 August 2023. No exceedance was recorded on same day during ebb tide from 07:13 to 07:16 and in the subsequent monitoring on 11 August 2023 both ebb and flood tide.

5.2.9       For the exceedances recorded in October 2023, smoothening works within enclosed silt curtain on 20 October 2023. Higher turbidity was recorded (>10 NTU) at all stations including control stations during ebb and flood tide. No exceedances was recorded in the subsequent monitoring at these stations on 23 Oct 2023, No marine works conducted on 23 October 2023. No exceedances was recorded in the subsequent monitoring at these stations on 25 Oct 2023.

5.2.10    Reviewed the overall work situation and the mitigation measures was implemented by the Contractor, it can be concluded that the turbidity and SS exceedances in the reporting period was possibly due to natural runoff from streams to the sea or sudden changed of water body.

5.2.11    Marine water quality monitoring results measured in this reporting period are reviewed and summarized. Details of marine water quality monitoring graphical presentation and the summary of exceedance of action and /limit levels of WQM 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       The retained tree (T035) Dalbergia assamica (南嶺黃檀) located within the site boundary of the Construction of San Shek Wan Sewage Treatment Works was collapsed on 2 Sep 2023 afternoon after typhoon “Saola” (Signal No. 10). Incident report for this case was provided by the Contractor on 11 October 2023. To minimize obstruction to the public, the collapsed tree has been removed and delivered to Y Park.

5.3.4       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 (August, September and October 2023)

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)	2.14286	11.79968
Metals (in ‘000kg)	0.009	7.51050
Paper / Cardboard Packing (in ‘000kg)	0.0875	0.39678
Plastics (in ‘000kg)	0.0068	0.03866
Chemical Wastes (in ‘000kg)	0	0
General Refuses (in ‘000kg)	38.36	506.56
*: Further breakdown into sub-group if considered applicable;

 

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 the reporting period. Table 6.1 summarized the complaints from project commencement till now.

Table 6.1      Summary of Complaints

6.1.2       No notification of summons and successful prosecution regarding construction works were recorded in the reporting period.

6.1.3       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
Aug to Oct 2023	0
Project commencement to the end of last reporting quarter	2
Total	2

 

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.

The implemented mitigation measures are considered effective.

8.      Conclusion

8.1  Noise Monitoring.

8.1.1       Noise monitoring was conducted at eight (8) noise monitoring stations (N12a, N12b, N13, N14, N15b, N16a, N16b and N17) once per week in the reporting period.

8.1.2       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       Water quality monitoring on 1 September 2023 and 8 September 2023 were cancelled due to Typhoon Signal no. 8 and Black Rainstorm Signal respectively. Water quality monitoring on 9 October 2023 and 18 October 2023 were cancelled due to Strong Wind Signal no. 8 and Strong Monsoon Signal respectively.

8.2.3       In accordance with the action level and limit level in Baseline Monitoring Report Rev. 9.2 agreed by EPD on 2 September 2022, 15 action level and 0 limit level exceedances was recorded in the reporting period. 1 Action Level exceedance on SS during flood tide on 9 August 2023 was recorded. 3 action level exceedances on turbidity and SS during ebb tide on 20 October 2023 were recorded; 2 action level exceedances on turbidity and 4 action level exceedances on SS during flood tide were recorded on 23 October 2023, 1 action level exceedances on turbidity and SS during ebb tide was recorded on 23 October 2023. Reviewed the overall work situation and the mitigation measures was implemented by the Contractor, it can be concluded that the turbidity and SS exceedances in the reporting period was possibly due to natural runoff from streams to the sea or sudden changed of water body and non-project related.

 

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.

8.3.4       The retained tree (T035) Dalbergia assamica (南嶺黃檀) located within the site boundary of the Construction of San Shek Wan Sewage Treatment Works was collapsed on 2 Sep 2023 afternoon after typhoon “Saola” (Signal No. 10). Incident report for this case was provided by the Contractor on 11 October 2023. To minimize obstruction to the public, the collapsed tree has been removed and delivered to Y Park.

 

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Appendix 5.3

 

Quarterly Summary Waste Flow Table