Table of Content

 

 

EXECUTIVE SUMMARY. 1

1.......... introduction. 4

1.1        Background. 4

1.2        Scope of Report 5

1.3        Project Organization. 5

1.4        Summary of Construction Works. 5

2.......... Summary of EM&Amp;A Programme Requirements. 6

2.1        Monitoring Parameters and Locations. 6

2.2        Environmental Quality Performance Limits (Action/Limit Levels) 7

2.3        Environmental Mitigation Measures. 7

3.......... MONITORING Results. 8

3.1        Air Quality. 8

3.2        Construction Noise. 9

3.3        Landscape and Visual 12

3.4        Environmental Site Inspection. 13

4.......... Advice on solid and liquid waste management status. 16

4.1        Solid and Liquid Waste Management Status and Recommendations. 16

5.......... Summary of Non-Compliance (Exceedances) of environmental qualitY Performance Limits (Action and Limit Levels) 17

5.1        Summary of Exceedances and Review of the Reasons for and the Implications of Non-compliance  17

6.......... Complaint, Notification of Summons and Successful Prosecution. 19

6.1        Summary of Complaints, Notification of Summons and Successful Prosecutions. 19

7.......... Comments, Recommendations and Conclusions. 20

7.1          Comments on Mitigation Measures. 20

7.2          Recommendations on EM&Amp;A Programme. 23

7.3          Conclusions. 23

 


List of Tables

Table 1‑1 ........ Contact Information of Key Personnel 5

Table 2‑1.......... Locations of Air Quality Monitoring Station. 6

Table 2‑2.......... Air Quality Monitoring Parameters, Frequency and Duration. 6

Table 2‑3.......... Locations of Impact Noise Monitoring Station. 6

Table 2‑4.......... Noise Monitoring Parameters, Frequency and Duration. 6

Table 3‑1.......... Summary of Number of Exceedances for 1-hr and 24-hr TSP Concentration. 8

Table 3‑2 ........ Summary of Number of Exceedances for Daytime, Evening Time and Night-time Construction Impact Noise Monitoring. 11

Table 4‑1.......... Summary of Quantity of Waste for Disposal 16

Table 6‑1.......... Summary of Environmental Complaints and Prosecutions. 19

 

 

List of Figures

 

Figure 1.1........ General Layout Plan of the Project Site

Figure 2.1         Location of Air Quality Monitoring Station During Impact Monitoring

Figure 3.1         Location of Noise Monitoring Station During Impact Monitoring

 

 

List of Appendices

 

Appendix A       Project Organization Structure

Appendix B       Construction Programme

Appendix C       Implementation Schedule of Environmental Mitigation Measures (EMIS)

Appendix D      Summary of Action and Limit Levels

Appendix E       Graphical Presentation of Air Quality Monitoring Results over Past Four Months

Appendix F       Graphical Presentation of Noise Monitoring Results over Past Four Months

Appendix G      Cumulative Statistics on Exceedances, Complaints, Notification of Summons and Successful Prosecutions

 

 


EXECUTIVE SUMMARY

The proposed construction of interconnection tunnel and diaphragm wall for main pumping station at Stonecutters Island Sewage Treatment Works (SCISTW) (the Project) is a Designated Project under the Environmental Impact Assessment Ordinance (Cap. 499) (EIAO) and is governed by an Environmental Permit (EP-322/2008/C). The Project comprises the construction of Interconnection Tunnel between the Inlet Chamber of the Main Pumping Station and the existing Riser Shaft and diaphragm wall for the Main Pumping Station.

 

China State - Shanghai Tunnel Joint Venture was commissioned as the Contractor of the Project. AECOM Asia Co. Ltd. was employed by China State - Shanghai Tunnel Joint Venture as the Environmental Team to undertake the EM&Amp;A works for the Project.

 

The construction phase of the Project commenced on 10 December 2009. The impact environmental monitoring and audit (EM&Amp;A) programme of the Project, which includes air quality, noise and landscape and visual monitoring and environmental site inspections, was commenced on 10 December 2009.

 

This is the second Quarterly Environmental Monitoring and Audit Report prepared for the captioned Project. This report documents the findings of EM&Amp;A works conducted in the period between 1 March 2010 and 31 May 2010. As informed by the Contractor, construction activities in the reporting quarter were:

 

l  Drainage work;

l  Tree transplanting and protection;

l  Predrilling for mini-piles at main pumping station;

l  Construction of diaphragm wall for the main pumping station and its inlet chamber;

l  Construction of Utility diversion and common trench; and

l  Construction of guide wall at launching shaft region of interconnection tunnel.


l  Environmental Monitoring Works

 

EM&Amp;A Programme

 

A summary of monitoring and audit activities conducted in the reporting quarter is listed below:

 

24-hour TSP monitoring

15 sessions

1-hour TSP monitoring

  48 sessions

Daytime Noise monitoring 

               13 sessions

Evening Time Noise monitoring

39 sessions

Night-time Noise monitoring

  15 sessions

Landscape and Visual Inspection

3 sessions

Environmental Site Inspection

13 sessions

 

Breaches of Action and Limit Levels for Air Quality

No exceedance of Action and Limit Level was recorded for both 1-hour TSP and 24-hour TSP monitoring in the reporting quarter.

Breaches of Action and Limit Levels for Noise

According to the information provided by the Contractor, no Action Level exceedance was recorded since no noise related complaint was received in the reporting quarter.

No Limit Level exceedance of noise was recorded at all monitoring station in the reporting quarter, except the measured noise levels recorded on 12, 18, 24 and 30 March 2010 during night-time period.

Based on on-site observations during the course of noise measurements during night-time periods, excavation and general tidy-up work by workers were the major work process undertaking within the Project site.

Other external noise sources were also noted during the monitoring periods, which may have attributed to the measured noise levels.

Referring to the information provided by the Contractor, types and number of PMEs operated within the Project site on exceedance days comply with the requirements in the CNP (Ref: GW-RW0038-10).

According to the average baseline noise level recorded during night-time period, a Limit Level exceeding noise level had been recorded.

Therefore, it is believed that the Limit Level exceedances are not project-related and not solely caused by the Contractor’s construction activities.

According to the EIA report, no noise sensitive receiver was identified near the site area except the FSD Diving Rescue and Diving Training Centre. As informed by the Officer from FSD Diving Rescue and Diving Rescue Centre, there is no training course during the night-time period on normal weekdays. It is believed that the noise exceedance recorded would have unlikely caused any impact at NSRs farther away. No public complaints have been received in relation to the construction noise from the site during the restricted hours on 12, 18, 24 and 30 March 2010.

 

Complaint, Notification of Summons and Successful Prosecution

According to the information provided by the Contractor, no complaint, notification of summons and successful prosecution was received in the reporting quarter.

Reporting Changes

As confirmed by the Officer from FSD Diving Rescue and Diving Rescue Centre, there is no class during night-time for Year 2010. According to the EIA report, no other noise sensitive receiver was identified near the site area. Thus, the noise monitoring during the night-time period was considered not necessary for Year 2010.

 

With the approval from IEC & ER, the noise monitoring at monitoring station (NM6) during night-time period was suspended from April 2010 until the end of Year 2010.  The necessity of conducting noise monitoring at this station from Year 2011 will be reviewed later.

 


1             introduction

1.1          Background

1.1.1       The proposed construction of interconnection tunnel and diaphragm wall for main pumping station at Stonecutters Island Sewage Treatment Works (SCISTW) (the Project) is a Designated Project under the Environmental Impact Assessment Ordinance (Cap. 499) (EIAO) and is governed by an Environmental Permit (EP-322/2008/C).

1.1.2       The Project site is located in the Sham Shui Po District. It is located within the existing Stonecutters Island Sewage Treatment Works (SCISTW), which is bounded by Ngong Shung Road to the north and the west. The general layout plan of the Project site showing the contract area is shown in Figure 1.1.

1.1.3       The objective of the Project “Harbour Area Treatment Scheme (HATS) Stage 2A - Construction of Interconnection Tunnel and Diaphragm Wall for Main Pumping Station at Stonecutters Island Sewage Treatment Works (SCISTW)” under Contract DC/2009/05 is to provide Interconnection Tunnel between the Inlet Chamber of the Main Pumping Station and the existing Riser Shaft and diaphragm wall for the Main Pumping Station.

1.1.4       The scope of the Project comprises mainly:

l   Construction of Interconnection Tunnel with concrete lining between the Inlet Chamber of the Main Pumping Station and the existing Riser Shaft;

l   Construction of diaphragm wall, base slab and pile cap for the Main Pumping Station and its Inlet Chamber;

l   Excavation within the diaphragm walls for the Main Pumping Station and its Inlet Chamber to founding levels;

l   Piling works for the Main Pumping Station;

l   Utilities upgrading and diversion works;

l   Temporary launching shaft to be handed over to MPS Contractor;

l   Carrying out ground monitoring and instrumentation works;

l   Carrying out pumping test;

l   Miscellaneous building, civil and electrical and mechanical works; and

l   Landscape works.

 

1.1.5       The Project is anticipated to complete in mid 2012.

1.1.6       According to the Environmental Permit (EP-322/2008/C) and the EM&Amp;A Manual of the Project, there is a need of an EM&Amp;A programme including air quality and noise monitoring and landscape and visual impacts and environmental site inspections.

1.1.7       AECOM Asia Co. Ltd. was employed by the Contractor, China State - Shanghai Tunnel Joint Venture, as the Environmental Team (ET) to undertake the EM&Amp;A works for the Project. In accordance with the EM&Amp;A Manual of the Project, environmental monitoring of air quality, noise and landscape and visual impacts and environmental site inspections would be required for this Project.

1.1.8       The construction phase of the Project commenced on 10 December 2009. The impact environmental monitoring and audit (EM&Amp;A) programme of the Project, which includes air quality, noise and landscape and visual monitoring and environmental site inspections, was commenced on 10 December 2009.

 

1.2          Scope of Report

1.2.1       This is the second Quarterly Environmental Monitoring and Audit (EM&Amp;A) Report under the Contract DC/2009/05 – Harbour Area Treatment Scheme (HATS) Stage 2A - Construction of Interconnection Tunnel and Diaphragm Wall for Main Pumping Station at Stonecutters Island Sewage Treatment Works (SCISTW). This report presents a summary of the environmental monitoring and audit works, list of activities and mitigation measures proposed by the ET for the Project in the period between 1 March 2010 and 31 May 2010.

 

1.3          Project Organization

1.3.1       The project organization structure is shown in Appendix A. The key personnel contact names and numbers are summarized in Table 1-1.

Table 11         Contact Information of Key Personnel

Party

Position

Name

Telephone

Fax

ER

(Ove Arup)

The Engineer

S.Y. Chan

 

2528 3031

2370 4377

The Engineer Representative

M.P. Gamini Ananda

 

2370 4311

2370 4377

The Engineer Representative’s Coordinator

William Yu

 

9705 9566

2370 4377

IEC

(Mott MacDonald)

Independent Environmental Checker

Anne Kerr

2828 5793

2827 1823

Contractor

(China StateShanghai Tunnel Joint Venture)

Site Agent

Ben Siu

6432 1490

2370 2086

Environmental Officer

Chris Leung

2704 2095

2370 2086

ET (AECOM)

ET Leader

Edith Ng

3105 8525

2891 0305

 

1.4          Summary of Construction Works

1.4.1       As informed by the Contractor, the Contactor has carried out the following major activities in the reporting quarter:

l  Drainage work;

l  Tree transplanting and protection;

l  Predrilling for mini-piles at main pumping station;

l  Construction of diaphragm wall for the main pumping station and its inlet chamber;

l  Construction of Utility diversion and common trench; and

l  Construction of guide wall at launching shaft region of interconnection tunnel.

 

1.4.2       The latest Construction Programme of the Project is shown in Appendix B.

1.4.3       The mitigation measures implementation schedule (EMIS) are presented in Appendix C.


2             Summary of EM&Amp;A Programme Requirements

2.1          Monitoring Parameters and Locations

2.1.1       The EM&Amp;A Manual and Monitoring Proposal designated locations for the monitoring of environmental impacts in terms of construction noise and air quality impact due to the Project.  The description of monitoring parameters and detailed locations of monitoring stations for air quality and construction noise are listed below. The monitoring stations for air quality impact and construction noise are depicted in Figure 2.1 and 3.1 respectively.

Table 21          Locations of Air Quality Monitoring Station

ID

Location

Monitoring Station

AM7

West Kowloon No. 2 Sewage Pumping Station

Roof top of the premise

 

Table 22          Air Quality Monitoring Parameters, Frequency and Duration

Monitoring Station

Parameter

Frequency and Duration

 AM7

1-hour TSP

At least 3 times every 6 days

24-hour TSP

At least once every 6 days

 

Table 23          Locations of Impact Noise Monitoring Station

ID

Location

Monitoring Station

NM6

Customs’ Marine Base

1m from the exterior of the roof top façade of

Block H of Government Dockyard

 

Table 24          Noise Monitoring Parameters, Frequency and Duration

Monitoring Station

Parameters and Duration

Frequency

NM6

30-min measurement at monitoring station between 0700 and 1900 on normal weekdays.

 

3 times of 5-min measurement at monitoring station during restricted hours if construction works were carried out.

 

Leq, L10 and L90 would be recorded.

At least once per week

 

2.1.2       The EM&Amp;A Manual also required monthly landscape and visual audits and weekly environmental site inspections for air quality, noise, water quality, as well as waste management.

 


2.2          Environmental Quality Performance Limits (Action/Limit Levels)

2.2.1       The environmental quality performance limits, i.e. Action and Limit Levels for air quality impact and construction noise monitoring works were derived from the baseline monitoring results as detailed in the EM&Amp;A Manual and Monitoring Proposal.  Appendix D shows the established Action and Limit Levels for all monitoring parameters. 

 

2.3          Environmental Mitigation Measures

2.3.1       Relevant environmental mitigation measures as recommended in the Project EIA final report were stipulated in the EM&Amp;A Manual and environmental requirement in contract documents for the Contractor to adopt. A list of mitigation measures and their implementation statuses, i.e. Implementation Schedule of Mitigation Measures (EM(S), are given in Appendix C.

 

 


3             MONITORING Results

3.1          Air Quality

3.1.1       Air quality monitoring, including 1-hr and 24-hr TSP, was conducted for at least three times every 6 days and for at least once every 6 days respectively at the designated monitoring station (AM7, Rooftop of West Kowloon No.2 Sewage Pumping Station), in accordance with the EM&Amp;A Manual and Monitoring Proposal.

3.1.2       Forty-eight (48) sessions of 1-hr TSP monitoring and fifteen (15) sessions of 24-hr TSP monitoring were conducted at the designated monitoring station (AM7) in the reporting quarter.

3.1.3       The weather was mostly sunny, with occasional cloudy events in the reporting quarter. The trend of air quality monitoring results for the reporting quarter is given in Appendix E. Major dust source included construction activities of the Project and nearby traffic emissions.

3.1.4       There was no Action and Limit Level exceedance recorded for 1-hr TSP and 24-hr TSP in the reporting quarter.

3.1.5       Table 3-1 presents the number of exceedances recorded in each month of the reporting quarter. The number of monitoring events included regular impact monitoring events and additional ones, if any.

Table 31          Summary of Number of Exceedances for 1-hr and 24-hr TSP Concentration

Monitoring Parameter

Location

Level of Exceedance

Month

Mar 10

Apr 10

May 10

1-hr TSP

AM7

No. of monitoring events

18

15

15

Action

0

0

0

Limit

0

0

0

Total

0

0

0

24-hr TSP

AM7

No. of monitoring events

5

5

5

Action

0

0

0

Limit

0

0

0

Total

0

0

0

 

 


3.2          Construction Noise

3.2.1       Noise measurement was conducted at the designed monitoring station NM6, rooftop of Customs’ Marine Base (Block H of Government Dockyard), for at least once per week during the construction phase (daytime (0700 – 1900), evening time (1900 – 2300) and night-time (2300 – 0700 of next day)) of the Project. Monitoring station (NM6) serves as an alternative location for FSD Diving Rescue and Diving Training Centre which is regarded as a Noise Sensitive Receiver (NSR) as it is an institution.

3.2.1       As informed by the Contractor, the construction works had extended to include works during the evening time period (1900 to 2300) on all weekdays and during daytime and evening time period (0700 to 2300) on Sundays and Public Holidays in the reporting quarter, except on 5 April 2010 and 1 May 2010. Moreover, construction works had been further extended to the night-time period (2300 to 0700 of next day) on all days, except on 5 April 201, from 8 April to 11 April 2010 and on 1 May 2010. The construction works were conducted in accordance with the granted Construction Noise Permit (CNP) under NCO.

3.2.2       As confirmed by the Officer from FSD Diving Rescue and Diving Rescue Centre, there is no class during night-time period (from 2300 to 0700) for Year 2010. According to the EIA report, no noise sensitive receiver was identified near the site area except the FSD Diving Rescue and Diving Training Centre Thus, the noise monitoring during the night-time period was considered not necessary for Year 2010.

3.2.3       With the approval from IEC & ER, the noise monitoring at monitoring station (NM6) during night-time period (from 2300 to 0700) was suspended from April 2010 until the end of Year 2010.  The necessity of conducting noise monitoring at this station from Year 2011 will be reviewed later.

3.2.4       Thirteen (13) daytime noise monitoring events, thirty-nine (39) evening time noise monitoring events and fifteen (15) night-time noise monitoring events were carried out at the designated monitoring station (NM6) in the reporting quarter.

3.2.5       The weather was mostly sunny, with occasional cloudy events in the reporting quarter. The trend of construction noise impacts for the reporting quarter is given in Appendix F. Major noise source included construction activities of the Project, other construction sites nearby, operational noise form cargo transportation, engine noise from ships anchored at nearby piers, community noise and traffic noise from nearby piers.

3.2.6       According to the Contractor’s information, no noise complaint was received in the reporting quarter; hence, no Action Level exceedance was recorded.

3.2.7       No Limit Level exceedance of noise was recorded at monitoring station NM6 in the reporting quarter, except the measured noise levels recorded on 12, 18, 24 and 30 March 2010 during night-time period.

Based on on-site observations during the course of noise measurements during night-time periods, general tidy-up work by workers and excavation by hydraulic extractor/hydromill were the major work process undertaking within the Project site.

Other external noise sources, including engine noise from barge anchored at nearby piers, noise from chiller located at rooftop of Customs’ Marine Base (which was not operating during the past measurements and is close to the monitoring point) and traffic noise from occasional aircrafts passing by and from nearby piers, were also noted during the monitoring periods, which may have attributed to the measured noise levels.

Based on the information provided by the Contractor, types and number of PMEs operated within the Project site on exceedance days comply with the requirements in the CNP (Ref: GW-RW0038-10).

Referring to the baseline monitoring results, an average baseline noise level of Leq(5-min) 59.6 dB(A) was recorded at NM6 during night-time period, which already exceeded the Limit Level.

Therefore, it is believed that the Limit Level exceedances are not project-related and not solely caused by the Contractor’s construction activities.

Meanwhile, the Contractor is reminded to strictly implement all noise mitigation measures as stated in the EIA final report, EM&Amp;A Manual, EMP, Method Statements, General and Particular Specifications of this Project to avoid any further noise Limit Level exceedance and any public complaints.

Moreover, the Contractor was reminded to ensure that the types and number of PME deployed on site during the restricted hours should strictly comply with the granted CNPs.

According to the EIA report, no noise sensitive receiver was identified near the site area except the FSD Diving Rescue and Diving Training Centre. As informed by the Officer from FSD Diving Rescue and Diving Rescue Centre, there is no training course during the night-time period on normal weekdays. It is believed that the noise exceedance recorded would have unlikely caused any impact at NSRs farther away.

No public complaints have been received in relation to the construction noise from the site during the restricted hours on 12, 18, 24 and 30 March 2010.

Please refer to the monthly EM&Amp;A report (March 2010) accordingly for the details of the captioned exceedances.


 

3.2.8       Table 3-2 presents the number of exceedances recorded in each month of the reporting quarter. The number of monitoring events included regular monitoring events and additional ones, if any.

Table 32         Summary of Number of Exceedances for Daytime, Evening Time and Night-time Construction Impact Noise Monitoring

Monitoring Parameter

Location

Level of Exceedance

Month

Mar 10

Apr 10

May 10

Daytime Construction Noise

NM6

No. of monitoring events

5

4

4

Action

0

0

0

Limit

0

0

0

 

Total

0

0

0

Evening Time Construction Noise

NM6

No. of monitoring events

15

12

12

Action

0

0

0

Limit

0

0

0

 

Total

0

0

0

Night-time Construction Noise

NM6

No. of monitoring events

15

0

0

Action

0

0

0

Limit

0

0

0

 

Total

0

0

0

 


3.3          Landscape and Visual

3.3.1       In accordance with the EM&Amp;A Manual, during the construction phase of the Project, landscape and visual monitoring should be carried out monthly with supervision by a Registered Landscape Architect (RLA). The landscape and visual monitoring is to check if the design, implementation and maintenance of the landscape and visual mitigation measures are fully effectuated.

3.3.2       A Baseline Review was conducted prior to the commencement of the construction contracts. The Baseline Review is to review the landscape and visual baseline conditions associated with the Project. Based on the findings given in the Baseline Review Report, the baseline landscape resources, landscape character areas and visually sensitive receivers originally identified within the EIA study area are generally unchanged and rEM&Ain valid. Changes to the landscape and visual baseline are thus judged to be Insignificant.

3.3.3       Three (3) landscape and visual audits were conducted in the reporting quarter. Observations recorded during the audits in the reporting quarter are described below.

Protection of Existing Trees and Tree Works:

 

3.3.4       It was observed that the tree protection works in the Portion 2 (Launching Shaft) area was not effective. The Contractor had delineated the tree protection zone with railings for the protection of existing retained trees in the Portion 2 (Launching Shaft) area. A small nylon netting was also provided at the upper parts of the trees where works was being carried out as precautionary visual measures to prevent accidental tree damage from machinery swing movements. The Contractor was requested to carry out proper tree protection works, e.g. provision of nylon netting, for all rEM&Aining retained trees as soon as possible.

3.3.5       It was observed that the existing tree T171 (Casuarina equisetifolia) had die-back branches from the top.  The Contractor was requested to seek their landscape sub-contractor to have a detailed inspection and assessment at the top of the tree as to the cause of the tree die-back and to carry out remedial actions to nurse the tree back to health.  The Contractor was recommended to remove the dead branches, and to aerate the area at the base of the tree, apply mulch and slow released fertilizer.

3.3.6       It was observed that several of the existing trees at the excavated material stockpile area were damaged, including the damaged tree bark of unmarked tree Celtis sinensis and 2 broken branches on T245.  The Contractor was reminded to protect the existing trees during the construction work.  The Contractor was required to prune the damaged branches of T245 back to living tissues, and also to carry tree protection works as soon as possible for all existing trees at the excavated material stockpile area.

3.3.7       It was observed and as advised by the ER, the existing trees T009, T011, T013, T014, T053, to T055, T102, T015 to T017, T165 to T167, T169 to T171 andT500 to T509 were transplanted in the reporting quarter.


3.4          Environmental Site Inspection

3.4.1       There were thirteen (13) site inspections conducted in the reporting quarter to monitor the implementation of proper environmental pollution control and mitigation measures for the Project. The major concerns for the Project are air quality, noise, water quality and chemical and waste management. Observations recorded are described below.

3.4.2       The Contractor has rectified most of the observations as identified during environmental site inspections in the reporting quarter within agreed time frame. Rectifications of rEM&Aining identified items are undergoing by the Contractor. Follow-up inspections on the status on provision of mitigation measures will be conducted to ensure all identified items are mitigated properly.

 

3.4.3       Air Quality

lDark smoke emission was observed from a generator placed near the bentonite filtering plant near the gate at main pumping station. The Contractor should repair the concerned generator to avoid any dark smoke emission. Also, regular inspection on the status of machineries worked on site should be conducted by the Contractor to avoid any dark smoke emission.

 

3.4.4       Noise

lProper noise mitigation measures should be provided at rock breaking area along Utility diversion works area to minimize the noise impacts to nearby sensitive receivers.

 

3.4.5       Water Quality

lProper drainage channels (e.g. bunds and channels) and pumping systems should be provided at site boundaries at main pumping station and Portion 2 (Launching Shaft) and site area near wheel washing facilities in order to cope with run-off generated from the works area and wheel washing facilities and direct them to the sedimentation facilities, especially during rainstorm. All effluent discharged from the site shall be properly treated.

lSlurry accumulation was observed on the ground at bentonite filtering plants and particular works area at main pumping station. The Contractor should provide proper mitigation measures to the designated sand/slurry storage area of bentonite filtering plants to avoid any leakage/overflowing of slurry. Also, the Contractor should clear the accumulated slurry on ground regularly and provide proper measures (e.g. effective pumping systems) in order to avoid generation of silty run-off during rainstorm. All surface run-off should be properly desilted before discharge.

lChemical containers/oil drums/batteries placed within site area at main pumping station and Portion 2 (Launching Shaft) were found improperly stored. All Chemical containers/oil drums/batteries place within the Project site should be properly stored with provision of drip tray in order to avoid any chemical/oil leakage. Chemical containers/oil drums should be clearly and properly labelled. Chemical containers should be securely closed in order to avoid any chemical leakage.

lUsed fuel filters are found placed on the bare ground near the site offices at main pumping station. The used fuel filters should be treated as chemical wastes and stored in chemical waste storage area.

lDrip trays should be provided at works area at main pumping station where oil pumping was carrying out. Oil leakage from an excavator worked at main pumping station was observed. Drip tray should be provided to collect the leaked oil.

lOily liquid accumulations are observed inside the drip trays placed within works area and abandoned channels at main pumping station and at Portion 2 (Launching Shaft) near the gate. Oil stains are also observed on the bare ground at main pumping station works area. The Contractor should clear the oil stains and liquid mixture properly and disposed of them as chemical wastes. The Contractor should conduct regular inspections on the site conditions, especially after rainstorm.

lStagnant water accumulation was observed at the inactive wheel washing bay at Portion 2 (Launching Shaft), works area near excavated material stockpile area and at main pumping station. The Contractor should employ proper mitigation measures (e.g. proper channels and pumping systems), clear the accumulated stagnant water and apply larvicidal oil regularly in order to avoid stagnant water accumulation and mosquito breeding. Regular site inspection of site conditions should be conducted by the Contractor, especially after rainfall.

 

3.4.6       Chemical and Waste Management

lSite tidiness within the Project site area should be improved. General refuse and C&D wastes scattered and/or accumulated at designated collection receptacles/ storage area within the site area at main pumping station should be removed off-site regularly and disposed of properly. The Contractor should ensure the wastes were sorted properly before disposal.

lSetting of the chemical waste storage area on site and chemical waste containers placed on site should comply with Code of Practice on the Packing, Labelling and Storage of Chemical Wastes. Adequate ventilation should be allowed for the chemical waste storage area in order to prevent formation of any dangerous or harmful concentration of vapour in case of spillage or leakage. Chemical waste containers placed inside the chemical waste storage area should be properly labelled. The chemical waste storage area should be locked at all times.

lChemical containers/oil drums/batteries placed within site area at main pumping station and Portion 2 (Launching Shaft) were found improperly stored. All Chemical containers/oil drums/batteries place within the Project site should be properly stored with provision of drip tray in order to avoid any chemical/oil leakage. Chemical containers/oil drums should be clearly and properly labelled. Chemical containers should be securely closed in order to avoid any chemical leakage.

lFuel filters are found placed on the bare ground near the site offices at main pumping station. The fuel filters should be treated as chemical wastes and stored in chemical waste storage area.

lDrip trays should be provided at works area at main pumping station where oil pumping was carrying out. Oil leakage from an excavator worked at main pumping station was observed. Drip tray should be provided to collect the leaked oil.

lOily liquid accumulations are observed inside the drip trays placed within works area and abandoned channels at main pumping station and at Portion 2 (Launching Shaft) near the gate. Oil stains are also observed on the bare ground at main pumping station works area. The Contractor should clear the oil stains and liquid mixture properly and disposed of them as chemical wastes. The Contractor should conduct regular inspections on the site conditions, especially after rainstorm.

 

3.4.7       Others

l Relevant Environmental Permit was not posted at all vehicle site entrances/exits. The Contractor should post the latest Environmental Permit at all vehicle site entrances/exits.

 

 


4             Advice on solid and liquid waste management status

4.1          Solid and Liquid Waste Management Status and Recommendations

4.1.1       The Contractor is registered as a chemical waste producer for this Project. C & D material and waste sorting was carried out on site. Receptacles were available for general refuse and C&D wastes collection.

4.1.2       As advised by the Contractor, quantity of waste for disposal in the reporting quarter is summarized in the Table 4-1.

Table 41         Summary of Quantity of Waste for Disposal

Type of waste

Month

Total

Mar 10

Apr 10

May 10

C&D materials generated

Total C&D material generated

 7,285.24 tonnes

 8,237.82 tonnes

 8,826.23 tonnes

24,349.29 tonnes

Hard Rock and Large Broken Concrete

0 tonnes

134.22 tonnes

235.88 tonnes

370.10 tonnes

Soil, slurry and building debris

5,936.46 tonnes

6,219.28 tonnes

7,374.27 tonnes

19,530.01 tonnes

Mixed rock, concrete and soil

0 tonnes

264.84 tonnes

732.73 tonnes

997.57 tonnes

Used bentonite slurry

1,348.78 tonnes

1,619.48 tonnes

483.35 tonnes

3,451.61 tonnes

Reuse in other projects

0 tonnes

0 tonnes

0 tonnes

0 tonnes

Disposed to barging point

0 tonnes

0 tonnes

0 tonnes

0 tonnes

C&D wastes generated/collected

Metals

10,640 kg

10,300 kg

8,640 kg

29,580 kg

Paper cardboard packing

0 kg

0 kg

0 kg

0 kg

Plastics

0 kg

0 kg

0 kg

0 kg

Chemical waste

0 L

1,800 L

672 L

2,472 L

General refuse

6.85 tonnes

7.15 tonnes

8.66 tonnes

22.66 tonnes

 

4.1.3       The Contractor is advised to properly maintain on site C&D material and waste sorting, collection and recording system and maximize reuse / recycle of C&D material and waste. The Contractor is reminded to properly maintain housekeeping in the site area and dispose of the wastes accumulated on site regularly and properly.

4.1.4       The Contractor should ensure that the setting of the chemical waste storage area on site and chemical waste containers placed on site should comply with Code of Practice on the Packing, Labelling and Storage of Chemical Wastes. Chemical wastes should be properly stored in designated chemical waste storage area, collected by licensed collectors and disposed of at designated treatment facilities in accordance with the Waste Disposal (Chemical Waste) (General) Regulation.


5             Summary of Non-Compliance (Exceedances) of environmental qualitY Performance Limits (Action and Limit Levels)

 

5.1          Summary of Exceedances and Review of the Reasons for and the Implications of Non-compliance

5.1.1       There was no Action and Limit Level exceedance recorded for 1-hr TSP and 24-hr TSP in the reporting quarter.

5.1.2       According to the Contractor’s information, no noise complaint was received in the reporting quarter; hence, no Action Level exceedance was recorded.

5.1.3       No Limit Level exceedance of noise was recorded at monitoring station NM6 in the reporting quarter, except the measured noise levels recorded on 12, 18, 24 and 30 March 2010 during night-time period.

Based on on-site observations during the course of noise measurements during night-time periods, general tidy-up work by workers and excavation by hydraulic extractor/hydromill were the major work process undertaking within the Project site.

Other external noise sources, including engine noise from barge anchored at nearby piers, noise from chiller located at rooftop of Customs’ Marine Base (which was not operating during the past measurements and is close to the monitoring point) and traffic noise from occasional aircrafts passing by and from nearby piers, were also noted during the monitoring periods, which may have attributed to the measured noise levels.

Based on the information provided by the Contractor, types and number of PMEs operated within the Project site on exceedance days comply with the requirements in the CNP (Ref: GW-RW0038-10).

Referring to the baseline monitoring results, an average baseline noise level of Leq(5-min) 59.6 dB(A) was recorded at NM6 during night-time period, which already exceeded the Limit Level.

Therefore, it is believed that the Limit Level exceedances are not project-related and not solely caused by the Contractor’s construction activities.

Meanwhile, the Contractor is reminded to strictly implement all noise mitigation measures as stated in the EIA final report, EM&Amp;A Manual, EMP, Method Statements, General and Particular Specifications of this Project to avoid any further noise Limit Level exceedance and any public complaints.

Moreover, the Contractor was reminded to ensure that the types and number of PME deployed on site during the restricted hours should strictly comply with the granted CNPs.

According to the EIA report, no noise sensitive receiver was identified near the site area except the FSD Diving Rescue and Diving Training Centre. As informed by the Officer from FSD Diving Rescue and Diving Rescue Centre, there is no training course during the night-time period on normal weekdays. It is believed that the noise exceedance recorded would have unlikely caused any impact at NSRs farther away.

No public complaints have been received in relation to the construction noise from the site during the restricted hours on 12, 18, 24 and 30 March 2010.

Please refer to the monthly EM&Amp;A report (March 2010) accordingly for the details of the captioned exceedances.

5.1.4       Cumulative statistics of exceedances is provided in Appendix G.

 


6             Complaint, Notification of Summons and Successful Prosecution

 

6.1          Summary of Complaints, Notification of Summons and Successful Prosecutions

6.1.1       Referring to the information provided by the Contractor, there was no complaint, notification of summons and successful prosecution received in the reporting quarter.

6.1.2       Table 6-1 summarized the complaint, summons and successful prosecution received in the reporting period.

Table 61          Summary of Environmental Complaints and Prosecutions

 

Mar 10

Apr 10

May 10

Total

Complaint Logged

0

0

0

0

Summons Served

0

0

0

0

Successful Prosecution

0

0

0

0

 

6.1.3       Cumulative Statistics of Exceedance, Complaints, Notification of Summons and Successful Prosecutions recorded in the reporting quarter and since the commencement of the Project are given in Appendix G.


7             Comments, Recommendations and Conclusions

 

7.1          Comments on Mitigation Measures

7.1.1       According to the environmental site inspections performed in the reporting quarter, the following comments are provided:

 

7.1.2       Air Quality

l The Contractor should conduct regular inspection on the machineries worked on site in order to avoid any dark smoke emission from operating machineries. Any malfunctioning machineries identified should be properly repaired immediately.

 

7.1.3       Noise

l Proper noise mitigation measures should be provided at rock breaking area to minimize the noise impacts to nearby sensitive receivers.

 

7.1.4       Water Quality

l Proper drainage channels (e.g. bunds and channels) and pumping systems should be provided at site boundaries and site area near wheel washing facilities in order to cope with run-off generated from the works area and wheel washing facilities and direct them to the sedimentation facilities. All effluent discharged from the site shall be properly treated.

l Proper mitigation measures should be provided to the designated sand/slurry storage area at bentonite filtering plants to avoid any leakage/overflowing of slurry. The Contractor should clear the slurry accumulated within the works area regularly and provide proper measures (e.g. effective pumping systems) in order to avoid generation of silty run-off during rainstorm. All surface run-off should be properly desilted before discharge.

l Chemical containers/oil drums/batteries placed within site area should be properly stored with provision of drip tray in order to avoid any chemical/oil leakage. Chemical containers/oil drums should be clearly and properly labelled. Chemical containers should be securely closed in order to avoid any chemical leakage.

l Used fuel filters should be properly treated as chemical wastes and stored in chemical waste storage area.

l Drip trays should be provided at works area where works with potential oil leakage are carrying out and when oil leakage from the machineries worked on site was observed.

l Any oil mixed material, like oily mixture in drip trays and oil stains on ground, found within the works area shall be cleared and disposed of properly as chemical wastes. Regular inspection on the site condition should be conducted to avoid any accumulation of chemical wastes within works area, especially after rainstorm.

l The Contractor should provide proper mitigation measures (e.g. provision of proper channels and pumping systems, regular clearance of accumulated stagnant water and regular application of larvicidal oil) in order to avoid stagnant water accumulation and mosquito breeding within works area. Also, the Contractor should conduct regular site inspection of site conditions, especially after rainfall.

 

7.1.5       Chemical and Waste Management

l Site tidiness within the Project site area should be improved. General refuse and C&D wastes scattered and/or accumulated at designated collection receptacles/ storage area within the site area at main pumping station should be removed off-site regularly and disposed of properly. The Contractor should ensure the wastes were sorted properly before disposal.

l Setting of the chemical waste storage area on site and chemical waste containers placed on site should comply with Code of Practice on the Packing, Labelling and Storage of Chemical Wastes. Adequate ventilation should be allowed for the chemical waste storage area in order to prevent formation of any dangerous or harmful concentration of vapour in case of spillage or leakage. Chemical waste containers placed inside the chemical waste storage area should be properly labelled. The chemical waste storage area should be locked at all times.

l Chemical containers/oil drums/batteries placed within site area should be properly stored with provision of drip tray in order to avoid any chemical/oil leakage. Chemical containers/oil drums should be clearly and properly labelled. Chemical containers should be securely closed in order to avoid any chemical leakage.

l Used fuel filters should be properly treated as chemical wastes and stored in chemical waste storage area.

l Drip trays should be provided at works area where works with potential oil leakage are carrying out and when oil leakage from the machineries worked on site was observed.

l Any oil mixed material, like oily mixture in drip trays and oil stains on ground, found within the works area shall be cleared and disposed of properly as chemical wastes. Regular inspection on the site condition should be conducted to avoid any accumulation of chemical wastes within works area, especially after rainstorm.

 


7.1.6       Landscape and Visual Impact

l The Contractor was recommended to carry out proper tree protection works, e.g. provision of nylon netting, for all rEM&Aining retained trees within Portion 2 (Launching Shaft) area as soon as possible.

l The Contractor was recommended to prune the damaged tree branches and provide tree protection for all existing trees at the excavated material stockpile area.

 

7.1.7       Others

l The Contractor should ensure that relevant Environmental Permit was posted at all vehicle site entrances/exits.

 

 


7.2          Recommendations on EM&Amp;A Programme

7.2.1       The impact air quality and noise monitoring programme ensured that any environmental impact to the receivers would be readily detected and timely actions could be taken to rectify any non-compliance.  Assessment and analysis of monitoring results collected demonstrated the environmental acceptability of the Project. The monthly landscape and visual audit and weekly site inspection ensured that all the environmental mitigation measures recommended in the EIA final report were effectively implemented.

7.2.2       The EM&Amp;A programme, which include environmental monitoring of air quality, noise and landscape and visual impacts and environmental site inspections, effectively monitored the environmental impacts from the construction activities and no particular recommendation was advised for the improvement of the programme.

 

7.3          Conclusions

7.3.1       Air quality and noise monitoring and weekly site inspection were carried out from March 2010 to May 2010, in accordance with the EM&Amp;A Manual.

7.3.2       All 1-hour and 24-hour TSP monitoring results complied with the Action/Limit Level in the reporting quarter.

7.3.3       As per Contractor’s information, no Action Level exceedance of noise was recorded as complaints was recorded in the reporting quarter.

7.3.4       No Limit Level exceedance of noise was recorded at all monitoring station in the reporting quarter, except the measured noise levels recorded on 28 January 2010 and 5, 18 and 23 February 2010 during night-time period. The Limit Level exceedances are not considered as project-related and not solely caused by the Contractor’s construction activities.

7.3.5       Three landscape and visual audit was carried out in the reporting quarter. Recommendations on remedial actions were given to the Contractor for the deficiencies identified during the landscape and visual audit.

7.3.6       Referring to the information given by the Contractor, no environmental complaint, summons or prosecution was made against the Project in the reporting quarter.

7.3.7       Environmental site inspections were carried out 13 times in the reporting period. Recommendations on remedial actions were given to the Contractor for the deficiencies identified during the site audit.