Table of Content

 

Page

 

EXECUTIVE SUMMARY. 1

1.......... introduction. 3

1.1          Background. 3

1.2          Scope of Report 4

1.3          Project Organization. 4

1.4          Summary of Construction Works. 4

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 11

3.4        Environmental Site Inspection. 12

4.......... Advice on solid and liquid waste management status. 14

4.1        Solid and Liquid Waste Management Status and Recommendations. 14

5.......... Summary of Non-Compliance (Exceedances) of environmental qualitY Performance Limits (Action and Limit Levels) 15

5.1        Summary of Exceedances and Review of the Reasons for and the Implications of Non-compliance  15

6.......... Complaint, Notification of Summons and Successful Prosecution. 16

6.1        Summary of Complaints, Notification of Summons and Successful Prosecutions. 16

7.......... Comments, Recommendations and Conclusions. 17

7.1          Comments on Mitigation Measures. 17

7.2          Recommendations on EM&Amp;A Programme. 19

7.3          Conclusions. 19

 


List of Tables

Table 1‑1 ........ Contact Information of Key Personnel 4

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. 10

Table 4‑1 ........ Summary of Quantity of Waste for Disposal 14

Table 6‑1.......... Summary of Environmental Complaints and Prosecutions. 16

 

 

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/B). 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 first 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 10 December 2009 and 28 February 2010. As informed by the Contractor, construction activities in the reporting quarter were:

 

l  Drainage work;

l  Steel cage fixing work;

l  Welding work;

l  Tree transplanting and protection;

l  Construction of Engineer’s accommodation;

l  Mobilization of labours and plants;

l  Establishment of bentonite slurry treatment plant at main pumping station and its inlet chamber;

l  Ground treatment works at inlet chamber;

l  Demolish existing abandoned sewerage at main pumping station;

l  Construction of guide wall at main pumping station;

l  Predrilling for mini-piles at main pumping station;

l  Installation of geotechnical instrument for monitoring utility settlement at main pumping station and its inlet chamber and launching shaft tunnel;

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

l  Excavation for diaphragm wall at main pumping station and its inlet chamber;

l  Lifting cage for diaphragm wall at main pumping station and its inlet chamber;

l  Concreting to diaphragm wall at main pumping station and its inlet chamber;

l  Construction of site access ramp at launching shaft region;

l  Construction water pipe from Admin Building to launching shaft region and installation and connection of water meter;

l  Ground investigation and instrumentation for interconnection tunnel;

l  Construction of gates for interconnection tunnel;

l  Construction of guide wall for interconnection tunnel; and

l  Condition survey for riser shaft.

 


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

  42 sessions

Daytime Noise monitoring 

               12 sessions

Evening Time Noise monitoring

27 sessions

Night-time Noise monitoring

  12 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 28 January 2010 and 5, 18 and 23 February 2010 during night-time period.

Based on on-site observations during the course of noise measurements during night-time periods, excavation was 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.

No public complaints have been received in relation to the construction noise from the site during the restricted hours on 28 January 2010 and 5, 18 and 23 February 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.

 


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/B).

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 Stations;

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/B) 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 first 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 10 December 2009 and 28 February 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  Steel cage fixing work;

l  Welding work;

l  Tree transplanting and protection;

l  Construction of Engineer’s accommodation;

l  Mobilization of labours and plants;

l  Establishment of bentonite slurry treatment plant at main pumping station and its inlet chamber;

l  Ground treatment works at inlet chamber;

l  Demolish existing abandoned sewerage at main pumping station;

l  Construction of guide wall at main pumping station;

l  Predrilling for mini-piles at main pumping station;

l  Installation of geotechnical instrument for monitoring utility settlement at main pumping station and its inlet chamber and launching shaft tunnel;

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

l  Excavation for diaphragm wall at main pumping station and its inlet chamber;

l  Lifting cage for diaphragm wall at main pumping station and its inlet chamber;

l  Concreting to diaphragm wall at main pumping station and its inlet chamber;

l  Construction of site access ramp at launching shaft region;

l  Construction water pipe from Admin Building to launching shaft region and installation and connection of water meter;

l  Ground investigation and instrumentation for interconnection tunnel;

l  Construction of gates for interconnection tunnel;

l  Construction of guide wall for interconnection tunnel; and

l  Condition survey for riser shaft.

 

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 Stationas

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 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-two (42) 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

Dec 09

Jan 10

Feb 10

1-hr TSP

AM7

No. of monitoring events

12

18

12

Action

0

0

0

Limit

0

0

0

Total

0

0

0

24-hr TSP

AM7

No. of monitoring events

4

6

5

Action

0

0

0

Limit

0

0

0

Total

0

0

0

 

 


3.2          Construction Noise

3.2.1       Noise 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) on normal weekdays) of the Project.

3.2.2       Twelve (12) daytime noise monitoring events, twenty-seven (27) evening time noise monitoring events and twelve (12) night-time noise monitoring events were carried out at the designated monitoring station (NM6) in the reporting quarter.

3.2.3       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, community noise and traffic noise from nearby piers.

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

3.2.5       No Limit Level exceedance of noise was recorded at monitoring station NM6 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.

3.2.6       Based on on-site observations during the course of noise measurements during night-time periods, excavation by hydraulic extractor/hydromill was the major work process undertaking within the Project site.

3.2.7       Other external noise sources, like engine noise from derrick lighter anchored at nearby piers, beep noise from A/C room located at rooftop of Customs’ Marine Base, community noise and traffic noise from nearby piers, were also noted during the monitoring periods, which may have attributed to the measured noise levels.

3.2.8       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).

3.2.9       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.

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

3.2.11    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.

3.2.12    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.

3.2.13    According to the EIA final report, no noise sensitive receiver was identified near the site area except the FSD Diving Rescue and Diving Training Centre. It is believed that the noise exceedance recorded would have unlikely caused any impact at NSRs farther away.

3.2.14    No public complaints have been received in relation to the construction noise from the site during the restricted hours on 28 January 2010 and 5, 18 and 23 February 2010.

3.2.15    Please refer to the monthly EM&Amp;A reports (January 2010 and February 2010) accordingly for the details of the captioned exceedances.

3.2.16    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

Dec 09

Jan 10

Feb 10

Daytime Construction Noise

NM6

No. of monitoring events

4

4

4

Action

0

0

0

Limit

0

0

0

 

Total

0

0

0

Evening Time Construction Noise

NM6

No. of monitoring events

6

12

9

Action

0

0

0

Limit

0

0

0

 

Total

0

0

0

Night-time Construction Noise

NM6

No. of monitoring events

0

3

9

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 are described below.

Protection of Existing Trees and Tree Works:

 

3.3.4       It was observed existing undersized trees had been removed by Contractor to make way for the works.

3.3.5       All existing trees to be retained on site at Portion 4 works area were found to be fenced off.

3.3.6       It was advised by the ER that the final revised application for transplanting of existing trees T500 to T509 were submitted to LCSD for approval as the trees were found to be in the works area and would affect the works. The application should be approved soon based on recent discussions with LCSD.

3.3.7       It was advised by the ER that the works in the Portion 1 area would be commenced soon.  The Contractor was requested to carry out tree protection works to existing trees as soon as possible prior to works commence in the Portion 1.

3.3.8       The Contractor was reminded that sufficient time should be allowed for the rootball preparation works for transplant trees prior to transplanting after approval is received.

 


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. All the observations were rectified by the Contractor within the agreed time frame.

 

3.4.2       Air Quality

lCoverage at the bentonite slurry treatment plant on site should be properly maintained in order to avoid fugitive dust emission during the process.

lRegular water spraying on access roads and exposed site areas should be provided in order to suppress any fugitive dust emission generated during dump trucks passing, especially during dry seasons.

lThe Contractor should ensure that the wheel washing facility at the site exit of the works area borrowed from other Contract was operating properly in order to remove deposited silt on dump trucks’ wheels and bodies.

lStockpile of excavated material placed at the work area borrowed from other Contract should be properly covered up with tarpaulin sheet to avoid fugitive dust emission.

 

3.4.3       Noise

lNoise mitigation measures stipulated in the EM&Amp;A Manual Section 3 (i.e. use of quiet PME and provision of movable noise barriers) should be implemented on site properly when construction tasks mentioned in the EM&Amp;A Manual Section 3 (e.g. excavation) were carrying out.

lRelevant valid Construction Noise Permits (CNP) should be posted at all site entrances/exits accessible to the public.

 

3.4.4       Water Quality

lThe Contractor should provide proper mitigation measures in order to avoid stagnant water accumulation within works area, especially area near wheel washing bay and inside the bentonite slurry treatment plant. The Contractor should clear the stagnant water, apply larvicidal oil to standing water found on site and/or provide proper measures in order to avoid stagnant water accumulation. Regular site inspection of site conditions should be conducted by the Contractor, especially after rainfall.

lProper drainage system (e.g. bunds and channels) and pumping system should be provided at the site boundaries in order to cope with surface/storm run-off generated on site. All effluent discharged from the site shall be properly treated.

lMud deposited outside the diaphragm wall curbing area and within the bentonite slurry treatment plant area should be removed regularly to prevent mud washing away outside the site area, especially during raining days. Proper pumping system should be provided at the bentonite slurry treatment plant area to drain away the silty surface run-off accumulated effectively. All surface run-off should be properly desilted before discharge.

lOil drums and chemical containers placed on site should be properly stored with drip tray in order to avoid any oil/chemical leakage.

 

3.4.5       Chemical and Waste Management

lSite tidiness should be improved. General refuse and C&D wastes scattered at the site area, site office area, works area borrowed from other Contract and those accumulated in the collection bins should be removed off-site regularly and disposed of properly. Collection bins should be provided at site office area and works area borrowed from other Contract to ease the collection of general refuse. The Contractor should ensure the wastes were sorted properly before disposal.

lSteel scrap was found scattered on the ground at steel fixing area. Steel scrap should be properly collected in collection bin and additional collection bin should be provided in order to ease the collection/storage of recyclable steel wastes. Steel wastes accumulated inside the collection bin should be removed off-site regularly.

lThe Contractor should ensure segregation and recycling of C&D wastes (especially on steel bars and paper packaging) were properly implemented on site.

lGeneral refuse was observed disposed at recycle bin for plastic. It was understood from the Contractor that the old recycle bins were intended to be use as bins for general refuse, as such proper labelling should be provided for identification.    

lOil drums and chemical containers placed on site should be properly labelled and stored with drip tray in order to avoid any oil/chemical leakage.

lOily liquid mixture accumulation was observed inside the drip tray for oil drums and generators placed on site. The Contractor should clear them and dispose of as chemical wastes. The Contractor should conduct regular inspections on the site conditions in order to avoid any chemical wastes accumulations on site.

 

3.4.6       Others

lThe Contractor should ensure that updated Environmental Permit was posted at all site entrances.


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

Dec 09

Jan 10

Feb 10

C&D materials generated

Total C&D material generated

 1,434.75 tones

2936.83 tones

6187.97 tones

Hard Rock and Large Broken Concrete

122.81 tones

0 tones

0 tones

Soil, slurry and building debris

1311.94 tones

2819 tones

0 tones

Mixed rock and soil

0 tones

78.71 tones

5902.15 tones

Used bentonite slurry

0 tones

39.12 tones

285.82 tones

Reuse in other projects

0 tones

0 tones

0 tones

Disposed to barging point

0 tones

0 tones

0 tones

C&D wastes generated/collected

Metals

0 kg

0 kg

0 kg

Paper cardboard packing

0 kg

0 kg

0 kg

Plastics

0 kg

0 kg

0 kg

Chemical waste

0 L

0 L

0 L

General refuse

29.06 tons

19.57 tons

6.56 tones

 

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.

4.1.4       Also, used chemical containers should be treated as chemical waste and be collected by licensed Contractor properly.

4.1.5       The Contractor is reminded to properly maintain housekeeping in the site area and dispose of the wastes accumulated on site regularly and properly.

4.1.6       Moreover, the Contractor is recommended to properly plan the ordering of C&D materials required for the Project in order to avoid generation of additional C&D material for disposal.

 


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 28 January 2010 and 5, 18 and 23 February 2010 during night-time period.

5.1.4       Based on on-site observations during the course of noise measurements during night-time periods, excavation by hydraulic extractor/hydromill was the major work process undertaking within the Project site.

5.1.5       Other external noise sources, like engine noise from derrick lighter anchored at nearby piers, beep noise from A/C room located at rooftop of Customs’ Marine Base, community noise and traffic noise from nearby piers, were also noted during the monitoring periods, which may have attributed to the measured noise levels.

5.1.6       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).

5.1.7       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.

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

5.1.9       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.

5.1.10    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.

5.1.11    According to the EIA final report, no noise sensitive receiver was identified near the site area except the FSD Diving Rescue and Diving Training Centre. It is believed that the noise exceedance recorded would have unlikely caused any impact at NSRs farther away.

5.1.12    No public complaints have been received in relation to the construction noise from the site during the restricted hours on 28 January 2010 and 5, 18 and 23 February 2010.

5.1.13    Please refer to the monthly EM&Amp;A reports (January 2010 and February 2010) accordingly for the details of the captioned exceedances.

5.1.14    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

 

Dec 09

Jan 10

Feb 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 Coverage at the bentonite slurry treatment plant on site should be properly maintained in order to avoid fugitive dust emission during the process.

l Regular water spraying should be provided on all access roads and exposed site areas in order to avoid any fugitive dust emission generated, especially during dry seasons.

l Wheel washing facilities should be provided and kept in operation at all site exits in the site area in order to remove deposited silt on dump trucks’ wheels and bodies.

l Any stockpile of excavated material placed at the work area should be properly covered up with tarpaulin sheet to avoid fugitive dust emission.

7.1.3       Noise

l Noise mitigation measures stipulated in the EM&Amp;A Manual Section 3 (i.e. use of quiet PME and provision of movable noise barriers) should be implemented on site properly when construction tasks mentioned in the EM&Amp;A Manual Section 3 (e.g. excavation) were carrying out.

l The Contractor should ensure that relevant valid Construction Noise Permits were posted at all site entrances/exits accessible to the public.

 

7.1.4       Water Quality

l Proper mitigation measures in order to avoid stagnant water accumulation within works area. The Contractor should clear the stagnant water once identified, apply larvicidal oil to standing water found on site regularly and/or provide proper measures in order to avoid stagnant water accumulation. Regular site inspection of site conditions should be conducted by the Contractor, especially after rainfall.

l Proper drainage system (e.g. bunds and channels) and pumping system should be provided at the site boundaries and works area in order to cope with surface/storm run-off generated on site. All effluent discharged from the site shall be properly treated.

l  Mud deposited outside the diaphragm wall curbing area and within the bentonite slurry treatment plant area should be removed regularly to prevent mud washing away outside the site area, especially during raining days. Proper pumping system should be provided at the bentonite slurry treatment plant area to drain away the silty surface run-off accumulated effectively. All surface run-off should be properly desilted before discharge.

l  Oil drums and chemical containers placed on site should be properly stored with drip tray in order to avoid any oil/chemical leakage.

 

7.1.5       Chemical and Waste Management

l Housekeeping on site should be properly maintained. General refuse and C&D wastes should be stored properly, removed off-site regularly, sorted and disposed of properly. Sufficient collection bins should be provided at site office area and works area to ease the collection of general refuse and C&D wastes.

l Steel scrap should be properly collected in collection bin and additional collection bin should be provided in steel fixing area in order to ease the collection/storage of recyclable steel wastes. Steel wastes accumulated inside the collection bin should be removed off-site regularly.

l The Contractor should ensure segregation and recycling of C&D wastes (especially on steel bars and paper packaging) were properly implemented on site.

l Oil drums and chemical containers placed on site should be properly labelled and stored with drip tray in order to avoid any oil/chemical leakage.

l Oily liquid mixture accumulated inside the drip tray for oil drums and generators placed on site should be cleared and disposed of as chemical wastes. The Contractor should conduct regular inspections on the site conditions in order to avoid any chemical wastes accumulations on site.

 

7.1.6       Landscape and Visual Impact

l The Contractor was reminded proper tree protection works are to be provided when carry out works near existing trees, especially the existing trees within Portion 1 area.

l The Contractor was recommended to allow sufficient plan the works to allow sufficient time for root ball preparation works for transplant trees.

 

7.1.7       Others

l The Contractor should ensure that updated Environmental Permit was posted at all site entrances.

7.1.8       The Contractor has rectified all the observations as identified during environmental site inspection in the reporting quarter within agreed time frame.


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 December 2009 to February 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.

7.3.5       Based on on-site observations during the course of noise measurements during night-time periods, excavation was the major work process undertaking within the Project site.

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

7.3.7       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).

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

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

7.3.10    No public complaints have been received in relation to the construction noise from the site during the restricted hours on 28 January 2010 and 5, 18 and 23 February 2010.

7.3.11    Three landscape and visual audit was carried out in the reporting month. No adverse landscape and visual impact was identified during the site inspection.  The Contractor was rEM&Aindered to ensure all mitigation measures listed in the EM&Amp;A Manual were properly implemented on site.

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

7.3.13    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.