Table of Content

 

 

 

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

1.5        Summary of EM&Amp;A Programme Requirements. 5

2......... AIR QUALITY MONITORING.. 6

2.1        Monitoring Requirements. 6

2.2        Monitoring Equipment 6

2.3        Monitoring Location. 6

2.4        Monitoring Parameters, Frequency and Duration. 7

2.5        Monitoring Methodology. 7

2.6        Monitoring Schedule for the Reporting Month. 10

2.7        Monitoring Results. 10

3......... Noise MONITORING.. 11

3.1        Monitoring Requirements. 11

3.2        Monitoring Equipment 11

3.3        Monitoring Location. 11

3.4        Monitoring Parameters, Frequency and Duration. 12

3.5        Monitoring Methodology. 13

3.6        Monitoring Schedule for the Reporting Month. 14

3.7        Monitoring Results. 14

4......... LANDSCAPE and VISUAL. 15

4.1        Monitoring Requirements. 15

4.2        Background. 15

4.3        Summary of Inspection – 25 August 2010. 15

4.4        Next Landscape and Visual Audit Schedule. 15

5......... ENVIRONMENTAL SITE INSPECTION AND AUDIT. 16

5.1        Site Inspection. 16

5.2        Advice on the Solid and Liquid Waste Management Status. 18

5.3        Environmental Licenses and Permits. 19

5.4        Implementation Status of Environmental Mitigation Measures. 20

5.5        Summary of Exceedances of the Environmental Quality Performance Limit 20

5.6        Summary of Complaints, Notification of Summons and Successful Prosecutions. 21

6......... FUTURE KEY ISSUES. 22

6.1        Construction Programme for the Coming Two Months. 22

6.2        Key Issues for the Coming Month. 22

6.3        Monitoring Schedule for the Coming Month. 22

7......... ConclusionS AND RECOMMENDATIONS. 23

7.1        Conclusions. 23

7.2        Recommendations. 24

 

List of Tables

 

Table 1.1           Contact Information of Key Personnel

Table 2.1           Air Quality Monitoring Equipment

Table 2.2           Locations of Air Quality Monitoring Station

Table 2.3           Air Quality Monitoring Parameters, Frequency and Duration

Table 2.4           Summary of 1-hour TSP Monitoring Results in the Reporting Period

Table 2.5           Summary of 24-hour TSP Monitoring Results in the Reporting Period

Table 3.1           Noise Monitoring Equipment

Table 3.2           Locations of Impact Noise Monitoring Station

Table 3.3           Noise Monitoring Parameters, Frequency and Duration

Table 3.4           Summary of Impact Noise Monitoring Results During Daytime on Normal Weekdays in the Reporting Period

Table 3.5           Summary of Impact Noise Monitoring Results During Evening time on Normal Weekdays in the Reporting Period

Table 5.1           Summary of Environmental Licensing and Permit Status

 

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       Calibration Certificates of Equipments

Appendix F       EM&Amp;A Monitoring Schedules

Appendix G      Air Quality Monitoring Results and their Graphical Presentations

Appendix H       Noise Monitoring Results and their Graphical Presentations

Appendix I        Meteorological Data for August 2010

Appendix J       Event Action Plan

Appendix K       Detailed Landscape and Visual Monitoring Report

Appendix L       Cumulative Statistics of 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 report documents the findings of EM&Amp;A works conducted in the period between 1 and 31 August 2010. As informed by the Contractor, major construction activities in the reporting period 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.

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 month.

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 month.

No Limit Level exceedance of noise was recorded at all monitoring station in the reporting month.

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 month.

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.

Future Key Issues

Key issues to be considered in the coming month included:

-    Properly store and label oil drums and chemical containers placed on site;

-    Proper chemical, chemical waste and waste management;

-    Segregation and recycling of construction wastes should be properly implemented;

-    Collection of construction wastes should be carried out properly and regularly;

-    Site runoff should be properly collected and treated prior to discharge;

-    Regular review and maintenance of drainage systems and desilting facilities;

-    Accumulation of slurry and stagnant water within site area should be avoided;

-   Suppress dust generated from bentonite slurry treatment plant, excavation activities and haul road traffic;

-   Regular inspection and maintenance of machineries operated on site to avoid any dark smoke emission and oil leakge;

-    Quieter powered mechanical equipment should be used;

-    Noise control measures, such as erection of movable noise barrier, should be properly

maintained on site; and

-    Proper tree protection works should be provided when carry out works near existing trees.

 

 


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:

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 audits 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 ninth monthly 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 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 1.1          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)

Environmental Team 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 month:

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 Construction Programme is shown in Appendix B.

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

 


1.5          Summary of EM&Amp;A Programme Requirements

1.5.1       The EM&Amp;A programme required environmental monitoring for air quality, noise and landscape and visual impacts, environmental site inspections for air quality, water quality, noise and waste management. The EM&Amp;A requirements for each parameter described in the following sections include:

-       All monitoring parameters;

-       Monitoring schedules for the reporting month and forthcoming months;

-       Action and Limit levels for all environmental parameters;

-       Event / Action Plan;

-       Environmental mitigation measures, as recommended in the Project EIA study final report; and

-       Environmental requirement in contract documents.


2             AIR QUALITY MONITORING

2.1          Monitoring Requirements

2.1.1       In accordance with the EM&Amp;A Manual, 1-hour and 24-hour TSP levels at 4 air quality monitoring stations should be established. As accesses to some of the proposed monitoring stations as stipulated in the EM&Amp;A manual have been rejected by other parties or found to be not suitable, a Monitoring Proposal, presenting the alternative monitoring stations, requirements and methodologies for the monitoring, had been submitted.

2.1.2       Moreover, monitoring station at Block A of Government Dockyard mentioned in the Monitoring Proposal will be established by the other contract (Contract DE/2009/02: Provision of Covers and Deodourisation Facilities to the Existing Sedimentation Tanks at SCISTW), so impact monitoring details at this station are not mentioned in this report.

2.1.3       Impact monitoring of air quality at 1 monitoring station, West Kowloon No. 2 Sewage Pumping Station (AM7), as described in the Monitoring Proposal, was established.

2.1.4       Impact 1-hour TSP monitoring was conducted for at least three times every 6 days, while impact 24-hour TSP monitoring was carried out for at least once every 6 days. The Action and Limit level of the air quality monitoring is provided in Appendix D.

 

2.2          Monitoring Equipment

2.2.1       24-hour TSP air quality monitoring was performed using High Volume Sampler (HVS) located at the designated monitoring station. The HVS meets all the requirements of the EM&Amp;A Manual. Portable direct reading dust meters were used to carry out the 1-hour TSP monitoring. Brand and model of the equipment is given in Table 2.1.

Table 2.1          Air Quality Monitoring Equipment

Equipment

Brand and Model

Portable direct reading dust meter (1-hour TSP)

Sibata Digital Dust Monitor (Model No. LD-3 and LD-3B)

High Volume Sampler
(24-hour TSP)

Graseby Andersen Total Suspended Particulate Mass

Flow Controlled Sampling System

(Model No.GMWS2310)

 

 

2.3          Monitoring Location

2.3.1       Monitoring station (AM7), was set up at the proposed location in accordance with the Monitoring Proposal submitted, as agreed by the ER and IEC. Figure 2.1 shows the location of air quality monitoring station during impact phase. Table 2.2 describes the details of the monitoring station.

Table 2.2          Locations of Air Quality Monitoring Station

ID

Location

Monitoring Station

AM7

West Kowloon No. 2 Sewage Pumping Station

Roof top of the premise

2.4          Monitoring Parameters, Frequency and Duration

2.4.1       Table 2.3 summarizes the monitoring parameters, frequency and duration of impact TSP monitoring.

Table 2.3      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

 

2.5          Monitoring Methodology

2.5.1       24-hour TSP Monitoring

(a)           The HVS was installed in the vicinity of the air sensitive receivers.  The following criteria were considered in the installation of the HVS.

 

(i)             A horizontal platform with appropriate support to secure the sampler against gusty wind was provided.

(ii)            The distance between the HVS and any obstacles, such as buildings, was at least twice the height that the obstacle protrudes above the HVS.

(iii)           A minimum of 2 meters separation from walls, parapets and penthouse for rooftop sampler.

(iv)          A minimum of 2 meters separation from any supporting structure, measured horizontally is required.

(v)           No furnace or incinerator flues nearby.

(vi)          Airflow around the sampler was unrestricted.

(vii)         Permission was obtained to set up the samplers and access to the monitoring station.

(viii)        A secured supply of electricity was obtained to operate the samplers.

(ix)          The sampler was located more than 20 meters from any dripline.

(x)           Any wire fence and gate, required to protect the sampler, did not obstruct the monitoring process.

(xi)          Flow control accuracy was kept within ±2.5% deviation over 24-hour sampling period.

 

(b)           Preparation of Filter Papers

 

(i)             Glass fibre filters, G810 were labelled and sufficient filters that were clean and without pinholes were selected.

(ii)            All filters were equilibrated in the conditioning environment for 24 hours before weighing. The conditioning environment temperature was around 25 °C and not variable by more than ±3 °C; the relative humidity (RH) was < 50% and not variable by more than ±5%. A convenient working RH was 40%.

(iii)           All filter papers were prepared and analysed by ALS Technichem (HK) Pty Ltd., which is a HOKLAS accredited laboratory and has comprehensive quality assurance and quality control programmes.

 


(c)           Field Monitoring

 

(i)             The power supply was checked to ensure the HVS works properly.

(ii)            The filter holder and the area surrounding the filter were cleaned.

(iii)           The filter holder was removed by loosening the four bolts and a new filter, with stamped number upward, on a supporting screen was aligned carefully.

(iv)          The filter was properly aligned on the screen so that the gasket formed an airtight seal on the outer edges of the filter.

(v)           The swing bolts were fastened to hold the filter holder down to the frame.  The pressure applied was sufficient to avoid air leakage at the edges.

(vi)          Then the shelter lid was closed and was secured with the aluminium strip.

(vii)         The HVS was warmed-up for about 5 minutes to establish run-temperature conditions.

(viii)        A new flow rate record sheet was set into the flow recorder.

(ix)          On site temperature and atmospheric pressure readings were taken and the flow rate of the HVS was checked and adjusted at around 1.3 m3/min, and complied with the range specified in the EM&Amp;A Manual (i.e. 0.6-1.7 m3/min).

(x)           The programmable digital timer was set for a sampling period of 24 hrs, and the starting time, weather condition and the filter number were recorded.

(xi)          The initial elapsed time was recorded.

(xii)         At the end of sampling, on site temperature and atmospheric pressure readings were taken and the final flow rate of the HVS was checked and recorded.

(xiii)        The final elapsed time was recorded.

(xiv)        The sampled filter was removed carefully and folded in half length so that only surfaces with collected particulate matter were in contact.

(xv)         It was then placed in a clean plastic envelope and sealed.

(xvi)        All monitoring information was recorded on a standard data sheet.

(xvii)       Filters were then sent to ALS Technichem (HK) Pty Ltd. for analysis.

 

(d)           Maintenance and Calibration

 

(i)             The HVS and its accessories were maintained in good working condition, such as replacing motor brushes routinely and checking electrical wiring to ensure a continuous power supply.

(ii)            HVSs were calibrated using TE-5025A Calibration Kit upon installation and thereafter at bi-monthly intervals.

(iii)           Calibration certificate of the TE-5025A Calibration Kit and the HVSs are provided in Appendix E.

 


2.5.2       1-hour TSP Monitoring

(a)           Measuring Procedures

 

The measuring procedures of the 1-hour dust meter were in accordance with the Manufacturer’s Instruction Manual as follows:

(i)             Turn the power on.

(ii)            Close the air collecting opening cover.

(iii)           Push the “TIME SETTING” switch to [BG]

(iv)          Push “START/STOP” switch to perform background measurement for 6 seconds.

(v)           Turn the knob at SENSI ADJ position to insert the light scattering plate.

(vi)          Leave the equipment for 1 minute upon “SPAN CHECK” is indicated in the display.

(vii)         Push “START/STOP” switch to perform automatic sensitivity adjustment. This measurement takes 1 minute.

(viii)        Pull out the knob and return it to MEASURE position.

(ix)          Push the “TIME SETTING” switch the time set in the display to 3 hours.

(x)           Lower down the air collection opening cover.

(xi)          Push “START/STOP” switch to start measurement.

 

(b)           Maintenance and Calibration

 

(i)             The 1-hour TSP meter was calibrated at 1-year intervals against a continuous particulate TEOM Monitor, Series 1400ab.  Calibration certificates of the Laser Dust Monitors are provided in Appendix E.

 


2.6          Monitoring Schedule for the Reporting Month

2.6.1       The schedule for environmental monitoring in August 2010 is provided in Appendix F.

 

2.7          Monitoring Results

2.7.1       The monitoring results for 1-hour TSP and 24-hour TSP are summarized in Table 2.4 and 2.5 respectively. Detailed air quality monitoring results are presented in Appendix G.

Table 2.4        Summary of 1-hour TSP Monitoring Results in the Reporting Period

 

Average (mg/m3)

Range (mg/m3)

Action Level  (mg/m3)

Limit Level (mg/m3)

AM7

78

6984

322

500

 

Table 2.5          Summary of 24-hour TSP Monitoring Results in the Reporting Period

 

Average (mg/m3)

Range (mg/m3)

Action Level  (mg/m3)

Limit Level (mg/m3)

AM7

45

26 65

207

260

 

2.7.2       All 1-hour TSP and 24-hour TSP results were below the Action and Limit Level at all monitoring location in the reporting month.

2.7.3       The event action plan is annexed in Appendix J.

2.7.4       Weather information including wind speed and wind direction is annexed in Appendix I. The information was obtained from Hong Kong Observatory Cheung Sha Wan Anemometer Station.


3             Noise MONITORING

3.1          Monitoring Requirements

3.1.1       In accordance with the EM&Amp;A Manual, impact noise levels should be obtained at 2 noise monitoring stations. As accesses to some of the proposed monitoring stations as stipulated in the EM&Amp;A manual have been rejected by other parties or found to be not suitable, a Monitoring Proposal, presenting the alternative monitoring stations, requirements and methodologies for the monitoring, had been submitted.

3.1.2       Impact monitoring of construction noise at 1 monitoring station, Customs’ Marine Base (NM6) (which serves as alternative location for FSD Diving Rescue and Diving Training Centre), as described in the Monitoring Proposal, was established.

3.1.3       Impact noise monitoring was conducted for at least once per week during the construction phase of the Project. The Action and Limit level of the noise monitoring is provided in Appendix D.

 

3.2          Monitoring Equipment

3.2.1       Noise monitoring was performed using sound level meter at the designated monitoring station.  The sound level meters deployed comply with the International Electrotechnical Commission Publications (IEC) 651:1979 (Type 1) and 804:1985 (Type 1) specifications.  Acoustic calibrator was deployed to check the sound level meters at a known sound pressure level.  Brand and model of the equipment is given in Table 3.1.

Table 3.1          Noise Monitoring Equipment

Equipment

Brand and Model

Integrated Sound Level Meter

B&K (Model No. 2238)

Acoustic Calibrator

B&K (Model no. 4231)

 

 

3.3          Monitoring Location

3.3.1       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.

3.3.2       Monitoring station (NM6), was set up at the proposed location in accordance with the Monitoring Proposal submitted, as agreed by the ER and IEC. Figure 3.1 shows the location of noise monitoring station during impact phase. Table 3.2 describes the details of the monitoring station.

Table 3.2          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

3.4          Monitoring Parameters, Frequency and Duration

3.4.1       Table 3.3 summarizes the monitoring parameters, frequency and duration of impact noise monitoring.

Table 3.3          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

 

3.4.2       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 all Sundays and Public Holidays in the reporting month. Moreover, construction works at main pumping station and its inlet chamber had been further extended to the night-time period (2300 to 0700 of next day) on all days. The construction works were conducted in accordance with the granted Construction Noise Permit (CNP) under NCO.

3.4.3       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.

3.4.4       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.

3.4.5       According to the requirement stipulated in Clause 3.16 of EM&Amp;A Manual, additional weekly noise impact monitoring was carried out during restricted hours on the scheduled day as stated in Appendix F.

 


3.5          Monitoring Methodology

3.5.1       Monitoring Procedure

(a)           The sound level meter was set on a tripod at a height of 1.2 m above the ground.

(b)           Façade measurements were made at all monitoring locations.

(c)           The battery condition was checked to ensure the correct functioning of the meter.

(d)           Parameters such as frequency weighting, the time weighting and the measurement time were set as follows:

(i)             frequency weighting: A

(ii)            time weighting: Fast

(iii)           time measurement: Leq(30-minutes) during non-restricted hours i.e. 07:00 – 1900 on normal weekdays; Leq(5-minutes) x3 during restricted hours i.e. 19:00 – 23:00 and 23:00 – 07:00 of normal weekdays, whole day of Sundays and Public Holidays

(e)           Prior to and after each noise measurement, the meter was calibrated using the acoustic calibrator for 94dB(A) at 1000 Hz.  If the difference in the calibration level before and after measurement was more than 1 dB(A), the measurement would be considered invalid and repeat of noise measurement would be required after re-calibration or repair of the equipment.

(f)            During the monitoring period, the Leq, L10 and L90 were recorded.  In addition, site conditions and noise sources were recorded on a standard record sheet.

(g)           Noise measurement was paused during periods of high intrusive noise (e.g. dog barking, helicopter noise) if possible. Observations were recorded when intrusive noise was unavoidable.

(h)           Noise monitoring was cancelled in the presence of fog, rain, wind with a steady speed exceeding 5m/s, or wind with gusts exceeding 10m/s.

 

3.5.2       Maintenance and Calibration

(a)           The microphone head of the sound level meter was cleaned with soft cloth at regular intervals.

(b)           The meter and calibrator were sent to the supplier or HOKLAS laboratory to check and calibrate at yearly intervals.

(c)           Calibration certificates of the sound level meters and acoustic calibrators are provided in Appendix E.

 


3.6          Monitoring Schedule for the Reporting Month

3.6.1       The schedule for environmental monitoring in August 2010 is provided in Appendix F.

 

3.7          Monitoring Results

3.7.1       The monitoring results for noise are summarized in Table 3.4 to 3.5 and the monitoring data is provided in Appendix H.

Table 3.4          Summary of Impact Noise Monitoring Results During Daytime on Normal Weekdays in the reporting period

 

Average, dB(A),

Leq (30 mins)

Range, dB(A),

Leq (30 mins)

Limit Level, dB(A),

Leq (30 mins)

NM6

70.2

67.3 – 71.9

75

Table 3.5          Summary of Impact Noise Monitoring Results During Evening time on Normal Weekdays in the reporting period

 

Average, dB(A),

Leq (5 mins)

Range, dB(A),

Leq (5 mins)

Limit Level, dB(A),

Leq (5 mins)

NM6

67.5

65.7 – 68.4

70

Remarks: The bolded and underlined measured noise levels indicated the exceedance of Limit Level.

3.7.2       According to the information provided by the Contractor, no noise complaint was received in the reporting month; hence, no Action Level exceedance was recorded.   

3.7.3       No Limit Level exceedance of noise was recorded at all monitoring station in the reporting month.

3.7.4       The event action plan is annexed in Appendix J.

3.7.5       Major noise sources during the noise monitoring included nearby traffic noise, operational noise from cargo transportation, construction noise from other construction sites and community noises.


4             LANDSCAPE and VISUAL

4.1          Monitoring Requirements

4.1.1       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.

4.1.2       A detailed report is annexed in Appendix K.

 

4.2          Background

4.2.1       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.

 

4.3          Summary of Inspection – 25 August 2010

Matters Arising from Previous Inspections:

 

4.3.1       It was noted that removal of the dead trees at the excavated material stockpile area was still outstanding. 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.

4.3.2       Rectification of barriers dEM&Arcating the tree protection zone at the Portion 2 area was outstanding.  The Contractor was reminded to rectify the barriers as soon as possible to prevent workers from trespassing and causing damage to the trees. 

Protection of Existing Trees and Tree Works:

 

4.3.3       No new observation made during this inspection period.

Recommendations:

 

4.3.4       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.

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

4.3.6       The event action plan is annexed in Appendix J.

 

4.4          Next Landscape and Visual Audit Schedule

4.4.1       The landscape and visual audits in the next reporting month was tentatively scheduled to 22 September 2010.


5             ENVIRONMENTAL SITE INSPECTION AND AUDIT

5.1          Site Inspection

5.1.1       Site Inspections were carried out on a weekly basis to monitor the implementation of proper environmental pollution control and mitigation measures for the Project. In the reporting month, 4 site inspections were carried out on 4, 11, 18 and 25 August 2010. Particular observations are described below.

5.1.2       The Contractor has rectified most of the observations as identified during environmental site inspection in the reporting month 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.

 

5.1.3       Air Quality

·            Nil.

 

5.1.4       Noise

·            Nil.

 

5.1.5       Water Quality

·            Accumulation of slurry and stagnant water on the ground was observed within works area at main pumping station, although pumping systems were provided on site and clearance by machineries and workers are observed. The Contractor was recommended to provide effective measures on avoidance of slurry spreading and clearance of accumulated slurry and stagnant water on site, in order to avoid generation of silty surface run-off during rainstorm.

·            Few improperly stored oil drum are found within the works area at main pumping station, like works area near the gates. Although the works area at excavated material stockpile area is not inspected, the Contractor should ensure that all oil drums placed within the works area should be properly stored with provision of drip trays to avoid any leakage of oil.

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

·            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.

 


5.1.6       Chemical and Waste Management

 

·            C&D wastes were still found scattered on the ground at steel fixing works area at main pumping station. The Contractor should ensure that the wastes were properly sorted and disposed of off-site regularly. Also, the Contractor should clear the steel wastes stockpiled at the designated steel waste storage area on site regularly.

·            The Contractor should ensure that the C&D wastes accumulated at the waste skip placed at main pumping station were properly sorted and disposed of off-site regularly.

·            Few improperly stored oil drum are found within the works area at main pumping station, like works area near the gates. Although the works area at excavated material stockpile area is not inspected, the Contractor should ensure that all oil drums placed within the works area should be properly stored with provision of drip trays to avoid any leakage of oil.

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

·            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.

 

5.1.7       Others

·            Nil.


5.2          Advice on the Solid and Liquid Waste Management Status

5.2.1       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.

5.2.2       As advised by the Contractor, a total of 5,317.84 tonnes of inert C&D materials were generated on site in the reporting month. 4,073.56 tonnes of soil and slurry, 41.73 tonnes of mixed rock and soil, 10.17 tonnes of broken concrete and 42.24 tonnes of building debris were generated on site and disposed of at Public Fill (Tuen Mun Area 38 Fill Bank). 1,150.14 tonnes were used bentonite slurry and were disposed of at Public Fill (Tseung Kwan O Area 137 Fill Bank). 17,410 kg of metals was generated and collected by registered recycling collector. No paper cardboard packing and plastic were generated on site and collected by registered recycling collector. 1,000L of chemical waste was generated and collected by licensed chemical waste collectors. 16.34 tonnes of other types of wastes (e.g. general refuse) were generated on site and disposed of at North East New Territories (NENT) Landfill.

5.2.3       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.


5.3          Environmental Licenses and Permits

5.3.1       The environmental licenses and permits for this Project and valid in the reporting month is summarized in Table 5.1.

Table 5.1          Summary of Environmental Licensing and Permit Status

Statutory Reference

Description

Permit No.

Valid Period

Remarks

From

To

EIAO

Environmental Permit

EP-322/2008/D

14/07/10

--

-  Harbour Area Treatment Scheme (HATS) Stage 2A

APCO

NA notification

--

09/11/09

19/12/11

-  Whole Construction Site for Contract DC/2009/05

WPCO

Discharge License

WT00005755-2010

27/04/10

31/01/15

-  Discharge of Construction Runoff from Contract DC/2009/05

WDO

Chemical Waste Producer Registration

WPN5213-269-C3572-01

23/10/09

--

-  Whole Construction Site for Contract DC/2009/05

WDO

Waste Charges Account

7009440

--

--

-  Whole Construction Site for Contract DC/2009/05

NCO

Construction Noise Permit

GW-RW0154-10

07/04/10

06/10/10

-  Construction Site  at Portion 2, 3 and 4 for Contract DC/2009/05

NCO

Construction Noise Permit

GW-RW0252-10

29/05/10

21/11/10

-  Construction Site at Portion 1

(Utility diversion works area) for

Contract DC/2009/05

NCO

Construction Noise Permit

GW-RW0386-10

04/08/10

01/02/11

-   Construction Site at Portion 2 (Launching Shaft) for Contract DC/2009/05


5.4          Implementation Status of Environmental Mitigation Measures

5.4.1       In response to the site audit findings, the Contractor carried out corrective actions.

5.4.2       A summary of the Implementation Schedule of Mitigation Measures (EMIS) is presented in Appendix C. Many of the necessary mitigation measures were implemented properly.

 

5.5          Summary of Exceedances of the Environmental Quality Performance Limit

5.5.1       All 1-hour TSP and 24-hour TSP results were below the Action and Limit level at all monitoring location in the reporting month.

5.5.2       Referring to the information provided by the Contractor, there was no noise related complaint received in the reporting month; hence, no Action Level exceedance was recorded.

5.5.3       No Limit Level exceedance of noise was recorded at all monitoring station in the reporting month.

5.5.4       Cumulative statistics of exceedances is provided in Appendix L.

 


5.6          Summary of Complaints, Notification of Summons and Successful Prosecutions

5.6.1       Complaints shall be referred to the ET Leader for action. The ET Leader shall undertake the following procedures upon receipt of any complaint:

l  Log complaint and date of receipt onto the complaint database and inform the IC(E) immediately;

l  Investigate the complaint to determine its validity, and assess whether the source of the problem is due to works activities;

l  Identify mitigation measures in consultation with the IC(E) if a complaint is valid and due to works;

l  Advise the Contractor and the ER if additional mitigation measures are required;

l  Review the Contractor’s response to identified mitigation measures, and the updated situation;

l  If the complaint is transferred from EPD, submit interim report to EPD on status of the complaint investigation and follow-up action within the time frame assigned by EPD;

l  Undertake additional monitoring and audit to verify the situation if necessary, and review that circumstances leading to the complaint to not recur;

l  Report investigation results and subsequent actions to complainant (if the source of complaint is EPD, the results should be reported within the time frame assigned by EPD); and

l  Record the complaint, investigation, the subsequent actions and the results in the monthly EM&Amp;A reports.

 

5.6.2       During any complaint investigation work, the Contractor and the ER shall cooperate with the ET Leader in providing all necessary information and assistance for completion of the investigation. If mitigation measures are identified in the investigation, the Contractor shall promptly carry out the mitigation. The ER shall ensure that all necessary measures have been carried out by the Contractor.

5.6.3       Referring to the information provided by the Contractor, no environmental complaint, notification of summons and successful prosecution was received in the reporting month.

5.6.4       Cumulative statistics of complaints, notification of summons and successful prosecutions is provided in Appendix L.


6             FUTURE KEY ISSUES

6.1          Construction Programme for the Coming Two Months

6.1.1       The major construction works in September and October 2010 will be:

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.

 

6.2          Key Issues for the Coming Month

6.2.1       Key issues to be considered in the coming month included:

-       Properly store and label oil drums and chemical containers placed on site;

-       Proper chemical, chemical waste and waste management;

-       Segregation and recycling of construction wastes should be properly implemented;

-       Collection of construction wastes should be carried out properly and regularly;

-       Site runoff should be properly collected and treated prior to discharge;

-       Regular review and maintenance of drainage systems and desilting facilities;

-       Accumulation of slurry and stagnant water within site area should be avoided;

-       Suppress dust generated from bentonite slurry treatment plant, excavation activities and haul road traffic;

-       Regular inspection and maintenance of machineries operated on site to avoid any dark smoke emission and oil leakage;

-       Quieter powered mechanical equipment should be used;

-       Noise control measures, such as erection of movable noise barrier, should be properly maintained on site; and

-       Proper tree protection works should be provided when carry out works near existing trees.

 

6.3          Monitoring Schedule for the Coming Month

6.3.1       The tentative schedule for environmental monitoring in September 2010 is provided in Appendix F.


7             ConclusionS AND RECOMMENDATIONS

7.1          Conclusions

7.1.1       The construction phase of the project commenced in December 2009.

7.1.2       1-hour TSP, 24-hour TSP and noise monitoring were carried out in the reporting month.

7.1.3       All 1-hour TSP and 24-hour TSP monitoring results complied with the Action / Limit Level.

7.1.4       According to the Contractor’s information, no noise complaint was received in the reporting month. Hence, no Action Level exceedance was recorded.

7.1.5       No Limit Level exceedance of noise was recorded at all monitoring station in the reporting month.

7.1.6       One landscape and visual audit was carried out in the reporting month. Recommendations on remedial actions were given to the Contractor for the deficiencies identified during the landscape and visual audit.

7.1.7       Environmental site inspections were carried out 4 times in August 2010. Recommendations on remedial actions were given to the Contractor for the deficiencies identified during the site audits.

 


7.2          Recommendations

7.2.1       According to the environmental site inspections performed in the reporting month, the following recommendations were provided:

 

Air Quality Impact

·            Nil.

Construction Noise Impact

·            Nil.

Water Quality Impact

·            The Contractor should inspect the site condition regularly and provide effective measures on clearance of slurry, avoidance of slurry accumulation and its spreading and stagnant water accumulation within the works area, especially during rainstorm.

·            All oil containers placed within site area should be properly stored with provision of drip tray in order to avoid any oil leakage.

·            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 chemical wastes within works area, especially after rainstorm.


Chemical and Waste Management

·            Housekeeping on site should be improved. C&D wastes generated from the works area should be properly collected, sorted and disposed of off-site regularly. C&D wastes accumulated at designated waste storage area should be removed off-site regularly.

·            All oil containers placed within site area should be properly stored with provision of drip tray in order to avoid any oil leakage.

·            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 chemical wastes within works area, especially after rainstorm.

 

Landscape and Visual Impact

·            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.

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

 

Others

·            Nil.