Table of Content

 

Page

 

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. 18

6.1        Summary of Complaints, Notification of Summons and Successful Prosecutions. 18

7.......... Comments, Recommendations and Conclusions. 19

7.1        Comments on Mitigation Measures. 19

7.2        Recommendations on EM&Amp;A Programme. 21

7.3        Conclusions. 21

 


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. 18

 

 

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/D). 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 third 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 June 2010 and 31 August 2010. As informed by the Contractor, construction activities in the reporting quarter were:

 

l  Drainage work;

l  Tree transplanting and protection;

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

    launching shaft region of interconnection tunnel; and

l  Construction of Utility diversion and cable trough.


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

14 sessions*

1-hour TSP monitoring

  45 sessions

Daytime Noise monitoring 

               13 sessions

Evening Time Noise monitoring

39 sessions

Night-time Noise monitoring

  0 sessions

Landscape and Visual Inspection

3 sessions

Environmental Site Inspection

13 sessions

Remarks: * The scheduled monitoring on 3 July 2010 was suspended due to malfunction of High Volume Sampler.

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 10 July 2010 during evening time period.

Based on on-site observations during the course of noise measurements, diaphragm wall construction 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, type and number of PMEs operated within the Project site on exceedance day comply with the requirements in the CNP (Ref: GW-RW0154-10).

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. 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 10 July 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/D).

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:

n    

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/D) 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 third 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 June 2010 and 31 August 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  Construction of diaphragm wall for the main pumping station and its inlet chamber and at

launching shaft region of interconnection tunnel; and

l  Construction of Utility diversion and cable trough.

 

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, frequencies and durations 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 audit 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 (for 1-hr TSP) and for at least once every 6 days (for 24-hr TSP)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-five (45) sessions of 1-hr TSP monitoring and fourteen (14) sessions of 24-hr TSP monitoring were conducted at the designated monitoring station (AM7) in the reporting quarter. The scheduled monitoring on 3 July 2010 was suspended due to malfunction of High Volume Sampler.

3.1.3       The weather was mostly sunny, with occasional cloudy/rainy 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

Jun 10

Jul 10

Aug 10

1-hr TSP

AM7

No. of monitoring events

15

15

15

Action

0

0

0

Limit

0

0

0

Total

0

0

0

24-hr TSP

AM7

No. of monitoring events

5

4*

5

Action

0

0

0

Limit

0

0

0

Total

0

0

0

Remarks: * The scheduled monitoring on 3 July 2010 was suspended due to malfunction of High Volume Sampler.

 

 


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) and evening time (1900 – 2300)) 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 1 July 2010. Moreover, construction works had been further extended to the night-time period (2300 to 0700 of next day) on all days, except on 1 July 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 and thirty-nine (39) evening 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 10 July 2010 during evening time period.

Based on on-site observations during the course of noise measurements, diaphragm wall construction was the major work process undertaking within the Project site.

Other external noise sources, including construction noise from excavation work undergoing at other construction site nearby, engine noise from barge anchored at nearby piers and traffic noise from aircrafts passing by and from nearby piers, were also noted during the monitoring period, which may have attributed to the measured noise levels.

According to the information provided by the Contractor, two concrete lorry mixers, a hydromill, a bentonite filtering plant, a generator and a crane were operating within the Project site during the course of noise measruement. Type and number of PMEs operated comply with the requirements in the CNP (Ref: GW-RW0154-10).

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, 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. 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 10 July 2010.

Please refer to the monthly EM&Amp;A report (July 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

Jun 10

Jul 10

Aug 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

0

0

0

Action

0

0

0

Limit

0

0

0

 

Total

0

0

0

        Remarks: Exceedances which are not project-related are not presented in this table.

 


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       The Contractor had installed nylon netting as visual precautionary measures to prevent accidental damage to upper portion of trees that may be caused by machinery swing movements for trees retained within the tree protection zone in the Portion 2 area.  However, it was noted that one of the anchor ropes was tied to the existing T5 tree trunk.  The Contractor was requested to untie the anchor rope from the tree trunk and use other means to anchor the ropes.

3.3.5       It was observed that the barriers used to dEM&Arcate the tree protection zone at the Portion 2 area was either fallen over or dismantled.  The Contractor was requested to properly re-instate the tree protection zone in order to prevent workers from trespassing and causing damage to the trees.

3.3.6       The Contractor had carried out tree protection works for all existing trees at the excavated material stockpile area and the existing trees had been transplanted to holding nursery. However, the Contractor was reminded to remove all the dead trees as soon as possible to prevent accidents that may be caused by dead trees fallen over.

 


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

·            No water spraying or coverage is observed at excavation works area and exposed soil stockpiles at Utility diversion works area. The Contractor should provide proper dust mitigation measures (e.g. regular water spraying and tarpaulin sheet coverage to exposed soil stockpile) to suppress the fugitive dust emission from excavation works and exposed soil stockpiles.

·            Access road at main pumping station is found to be dusty. The Contractor is advised to provide regular watering to the access road, pave the access road with blacktop or compact the road surface to minimize the dust impact.

 

3.4.4       Noise

·            Nil.

 

3.4.5       Water Quality

·            Accumulation of slurry, oily liquid and stagnant water on the ground was observed at works area at main pumping station, although pumping systems were provided on site and clearance by machineries and workers were observed. The Contractor was recommended to provide effective measures on avoidance of slurry and oily liquid spreading and clearance of accumulated slurry, stagnant water and oily liquid on site, in order to avoid generation of silty and oily surface run-off during rainstorm. Oily mixture and slurry accumulated inside the drip trays for oil drums should be treated properly and disposed of as chemical wastes. Moreover, the Contractor should ensure that proper bunds/channels had been provided at the site boundaries to confine/collect the surface run-off from work site.

·            The Contractor should ensure that the rainwater pumped out from the works area at cable trenches should be properly discharged into silt removal facilities before discharge into storm drains.

·            No bund/channel was provided at site boundaries of excavated material stockpile area. Proper sand bags/bunds/channels should be provided at the concerned area to collect/direct the surface run-off to sedimentation facilities provided within the works area.

·            Exposed soil stockpiles were observed at Utility diversion works area and Launching Shaft (Portion 2). The Contractor should cover them up with tarpaulin sheet to avoid generation of silty run-off during rainstorm.

·            Stagnant water accumulation was observed in an abandoned sedimentation tank placed at utility diversion works area. The Contractor should clear the accumulated stagnant water to avoid mosquito breeding.

 

3.4.6       Chemical and Waste Management

·            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 areas within the site area at main pumping station and Utility diversion works area (especially works area near seawall) should be removed off-site regularly and disposed of properly. The Contractor should ensure the wastes were sorted properly before disposal.

·            The setting of chemical waste storage area provided at main pumping station was found improper. The designated chemical waste storage area should be kept locked at all times. Proper panels with correct Chinese characters of “Chemical Waste” should be provided at the designated chemical waste storage area. The designated chemical waste storage area should be relocated to a place where it is accessible by the workers.

·            Improper stored oil drum and chemical containers are found within the works area at main pumping station, Launching Shaft (Portion 2), excavated material stockpile area and cable trough works area. The Contractor should ensure that all oil drums and chemical containers placed within the works area should be properly stored with provision of drip trays and were covered up properly to avoid any leakage of oil and chemicals. Empty chemical containers placed at main pumping station should be properly labelled. Moreover, drip trays should be provided for works with potential oil leakage as oil stains were observed on the bare ground near site office area. Oil stains should be cleared and treated as chemical wastes.

·            Oil leakage was observed from an excavator worked at Utility diversion works area. The Contractor should repair the concerned excavator and provide proper measures to avoid any oil leakage onto the ground. Oil stains found on the ground should be cleared and dispose of as chemical waste.

·            Oily slurry accumulations on ground and inside the drip tray placed within works area at main pumping station were observed. The Contractor should clear the mixture and dispose of it as chemical waste.

·            Oil stains were observed on the bare ground near the chemical waste storage area at main pumping station. The Contractor should clear the oil stains and dispose of them as chemical waste.

 

3.4.7       Others

·            Environmental Permit posted at all vehicle site entrances/exits was found to be not up-to-date. The Contractor should post the relevant Environmental Permit at all vehicle site entrances/exits.

·            Newly obtained Construction Noise Permit (CNP) was not found posted at all vehicle site entrances/exits. The Contractor should post the newly obtained CNP at all vehicle site entrances/exits.

·            Construction materials and machinery parts were found placed near the existing trees at excavated material stockpile area and no protective measures were provided to the existing trees at the concerned area. Proper tree protective measures (e.g. protective net) should be provided to the existing trees at concerned works area. Construction materials and machinery parts should be removed and kept away from the existing trees to avoid accidental damage to the trees.


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

Jun 10

Jul 10

Aug 10

C&D materials generated

Total C&D material generated

 7,786.81 tonnes

 6,169.93 tonnes

 5,317.84 tonnes

19,274.58tonnes

Hard Rock and Large Broken Concrete

0 tonnes

71.51 tonnes

10.17 tonnes

81.68tonnes

Soil, slurry and building debris

5,422.83 tonnes

5,365.55 tonnes

4,115.80 tonnes

14,904.18tonnes

Mixed rock, concrete and soil

141.42 tonnes

154.88 tonnes

41.73 tonnes

338.03tonnes

Used bentonite slurry

2,222.56 tonnes

577.99 tonnes

1,150.14 tonnes

3,950.69tonnes

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

7,000 kg

8,890 kg

17,410 kg

33,300kg

Paper cardboard packing

0 kg

0 kg

0 kg

0 kg

Plastics

0 kg

0 kg

0 kg

0 kg

Chemical waste

2,400 L

1,400 L

1,000 L

4,800L

General refuse

14,14 tonnes

9.48 tonnes

16.34 tonnes

39.96tonnes

 

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 the site tidiness 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 should comply with Code of Practice on the Packing, Labelling and Storage of Chemical Wastes.

 


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 10 July 2010 during evening time period.

Based on on-site observations during the course of noise measurements, diaphragm wall construction was the major work process undertaking within the Project site.

Other external noise sources, including construction noise from excavation work undergoing at other construction site nearby, engine noise from barge anchored at nearby piers and traffic noise from aircrafts passing by and from nearby piers, were also noted during the monitoring period, which may have attributed to the measured noise levels.

According to the information provided by the Contractor, two concrete lorry mixers, a hydromill, a bentonite filtering plant, a generator and a crane were operating within the Project site during the course of noise measruement. Type and number of PMEs operated comply with the requirements in the CNP (Ref: GW-RW0154-10).

 

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, 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. 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 10 July 2010.

Please refer to the monthly EM&Amp;A report (July 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

 

Jun 10

Jul 10

Aug 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 Impact

·            Dust mitigation measures should be provided (e.g. regular water spraying and tarpaulin sheet coverage to exposed soil stockpile) to suppress the fugitive dust emission from excavation works and exposed soil stockpiles.

·            Dust suppressive measures should be provided to the access roads within site area, like regular watering to access road, pave the access road with blacktop or compact the road surface.

7.1.3       Noise

·            Nil.

7.1.4       Water Quality

·            The Contractor should inspect the site condition regularly and provide proper and effective measures on clearance and avoidance of slurry, stagnant water and oily liquid accumulation within the works area and their spreading, especially during rainstorm. Oily mixture found within the works area should be collected properly and treated as chemical wastes.

·            Rainwater pumped out from the works area should be properly discharged into silt removal facilities before discharge into storm drains.

·            Proper sand bags/bunds/channels should be provided at the site boundaries of the works area to collect/direct the surface run-off to sedimentation facilities provided within the works area.

·            Exposed soil stockpile should be covered up with tarpaulin sheet properly to avoid generation of silty run-off during rainstorm.

 

7.1.5       Chemical and Waste Management

·            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 areas within the site area should be removed off-site regularly and disposed of properly. The Contractor should ensure the wastes were sorted properly before disposal.

·            Setting of the chemical waste storage area on site should comply with Code of Practice on the Packing, Labelling and Storage of Chemical Wastes. The designated chemical waste storage area should be kept locked at all times. Proper panels with correct Chinese characters of “chemical waste” should be provided at the designated chemical wastes storage area. The designated chemical wastes storage area should be relocated to a place where it is accessible by the workers.

·            All oil drums and chemical containers placed within the works area should be properly stored with provision of drip trays and were covered up properly to avoid any leakage of oil and chemicals. Empty chemical containers placed at main pumping station should be properly labelled.

·            Drip trays should be provided for works with potential oil leakage to avoid any oil spillage.

·            Regular inspections of machineries worked on site should be conducted to avoid any oil leakage from them. Any malfunction machineries should be repaired properly.

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

 

7.1.6       Landscape and Visual Impact

·            Proper tree protective measures (e.g. protective net) should be provided to the existing trees within the works area. Construction materials and machinery parts should be kept away from the existing trees to avoid accidental damage to the trees.

·            The Contractor was requested to untie the anchor rope from the existing tree trunk at Portion 2 area as soon as possible.

·            The Contractor was reminded to remove dead trees at the excavated material stockpile area as soon as possible.

·            The Contractor was requested to re-instate the barriers for the tree protection zone of the existing trees at Portion 2 area as soon as possible.

 

7.1.7       Others

·            Relevant Environmental Permit and Construction Noise Permit should be 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 June 2010 to August 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 10 July 2010 during evening 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.