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. 6

2.......... AIR QUALITY MONITORING.. 7

2.1        Monitoring Requirements. 7

2.2        Monitoring Equipment 7

2.3        Monitoring Location. 7

2.4        Monitoring Parameters, Frequency and Duration. 8

2.5        Monitoring Methodology. 8

2.6        Monitoring Schedule for the Reporting Month. 11

2.7        Monitoring Results. 11

3.......... Noise MONITORING.. 12

3.1        Monitoring Requirements. 12

3.2        Monitoring Equipment 12

3.3        Monitoring Location. 12

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. 16

4.1        Monitoring Requirements. 16

4.2        Background. 16

4.3        Summary of Inspection – 25 February 2010. 16

4.4        Next Landscape and Visual Audit Schedule. 17

5.......... ENVIRONMENTAL SITE INSPECTION AND AUDIT. 18

5.1        Site Inspection. 18

5.2        Advice on the Solid and Liquid Waste Management Status. 20

5.3        Environmental Licenses and Permits. 21

5.4        Implementation Status of Environmental Mitigation Measures. 22

5.5        Summary of Exceedances of the Environmental Quality Performance Limit 22

5.6        Summary of Complaints, Notification of Summons and Successful Prosecutions. 23

6.......... FUTURE KEY ISSUES. 24

6.1        Construction Programme for the Coming Months. 24

6.2        Key Issues for the Coming Month. 24

6.3        Monitoring Schedule for the Coming Month. 24

7.......... ConclusionS AND RECOMMENDATIONS. 25

7.1        Conclusions. 25

7.2          Recommendations. 26

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 Stations

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 Stations

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 3.6           Summary of Impact Noise Monitoring Results During Night-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

Appendix H       Noise Monitoring Results

Appendix I        Meteorological Data for February 2010

Appendix J       Event Action Plan

Appendix K       Detailed Landscape and Visual Monitoring Report

Appendix L       Cumulative Statistics of Exceedance, Complaints, Notification of Summons and Successful Prosecutions



 

EXECUTIVE SUMMARY

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

 

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

 

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

 

This report documents the findings of EM&Amp;A works conducted in the period between 1 and 28 February 2010. As informed by the Contractor, construction activities in the reporting period were:

 

l  Drainage work;

l  Steel cage fixing work;

l  Welding work;

l  Tree transplanting and protection;

l  Mobilization of labours and plants;[C1] [C2] 

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

l  Ground treatment works at inlet chamber;

l  Demolish existing abandoned sewerage at main pumping station;

l  Predrilling for mini-piles at main pumping station;

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

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

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

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

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

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

l  Construction of guide wall for interconnection tunnel; and

l  Condition survey for riser shaft.

 

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, except the measured noise levels recorded on 5, 19 and 23 February 2010 during night-time period.

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

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

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

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

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

No public complaints have been received in relation to the construction noise from the site during the restricted Restricted Hours on 5, 19 and 23 February 2010.

 Complaint, Notification of Summons and Successful Prosecution

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

Reporting Changes

 

There was no reporting change in the reporting month.

Future Key Issues

Key issues to be considered in the coming month included:

-                  Properly store and label oils and chemicals on site;

-                  Chemical and waste management;

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

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

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

-                  Accumulation of stagnant water in site area should be avoided;

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

-                  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/B).

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

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

1.1.4       The scope of the Project comprises mainly:

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 Stations;

l   Utilities upgrading and diversion works;

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

l   Carrying out ground monitoring and instrumentation works;

l   Carrying out pumping test;

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

l   Landscape works.

 

1.1.5       The Project is anticipated to complete in mid 2012.

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

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

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

 

1.2          Scope of Report

1.2.1       This is the third 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 February 2010.

1.3          Project Organization

1.3.1       The project organization structure is shown in Appendix A. The key personnel contact names and numbers are summarized in Table 1.1

Table 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)

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 month:

l  Drainage work;

l  Steel cage fixing work;

l  Welding work;

l  Tree transplanting and protection;

l  Mobilization of labours and plants;[C3] [C4] 

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

l  Ground treatment works at inlet chamber;

l  Demolish existing abandoned sewerage at main pumping station;

l  Predrilling for mini-piles at main pumping station;

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

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

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

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

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

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

l  Construction of guide wall for interconnection tunnel; and

l  Condition survey for riser shaft.

 

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 environmental site inspections for air 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 Stationas (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 stations.

Table 2.2          Locations of Air Quality Monitoring Station

ID

Location

Monitoring Station

AM7

West Kowloon No. 2 Sewage Pumping Stationas

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 stations.

(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 Restricted 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 1.1 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 Restricted 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 February 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

89

75106

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

68

4493

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), 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 E.

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), 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 stations.

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 Restricted Hours if construction works were carried out.

 

Leq, L10 and L90 would be recorded.

At least once per week

 

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 Restricted Hours i.e. 07:00 – 1900 on normal weekdays; Leq(5-minutes) x3 during restricted 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 February 2010 is provided in Appendix F.

 

3.7          Monitoring Results

3.7.1       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 month, except the period from 10 to 17 February 2010. Moreover, construction works had been further extended to the night-time period (2300 to 0700 of next day) on all days except the period from 10 to 17 February 2010. The construction works were conducted in accordance with the granted Construction Noise Permit (CNP) under NCO.

3.7.2       According to the requirement stipulated in Clause 3.16 of EM&Amp;A Manual, additional weekly noise impact monitoring was carried out during evening time period (1900 to 2300) and night-time period (2300 to 0700 of next day) on the scheduled day as stated in Appendix F.

3.7.3       The monitoring results for noise are summarized in Table 3.4 to 3.6and 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

73.6

72.5 – 74.5

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

64.4

63.4 – 65.4

70

 

Table 3.6          Summary of Impact Noise Monitoring Results During Night-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

 

63.9

63.2 64.9

55

Background Corrected Noise Levels

61.9

60.7 – 63.4

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

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

3.7.5       No Limit Level exceedance of noise was recorded at all monitoring station in the reporting month, except the measured noise levels recorded on 5, 18 and 23 February 2010 during night-time period.

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

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

According to the information provided by the Contractor, the following plants were operating within the Project site on exceedance days:

l   A hydraulic extractor, a generator and three water pumps (electric) on 5 February 2010.

l   A hydromill, two generators and three water pumps (electric) on 18 February 2010.

l   A hydromill, a generator, a excavator and two water pumps (electric) on 23 February 2010.

Types and number of PMEs operated on exceedance days comply with the requirements in the CNP (Ref: GW-RW0038-10).

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

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

Meanwhile, the Contractor is reminded to strictly implement all noise mitigation measures as stated in the EIA, 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 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 Restricted Hours on 5, 18 and 23 February 2010.

3.7.6       The event action plan is annexed in Appendix J.

3.7.7       Major noise sources during the noise monitoring included nearby traffic noise, engine noise from ships anchored at nearby piers, 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 February 2010

Matters Arising from Previous Inspections:

 

4.3.1       The ER advised that the final revised application for transplanting of existing trees T500 to T509 were submitted to LCSD for approval and should be approved soon based on recent discussions with LCSD.

 

Protection of Existing Trees and Tree Works:

 

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

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

 

Recommendations:

 

4.3.4       The Contractor was recommended to carry out proper tree protection works to existing trees within Portion 1 area as soon as possible.

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

 

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 17 March 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 3, 10, 19 and 25 February 2010. Particular observations are described below. All the observations were rectified by the Contractor within the agreed time frame.

 

5.1.2       Air Quality

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

 

5.1.3       Noise

l   The Contractor should ensure that valid Construction Noise Permits were posted at all site entrances.

 

5.1.4       Water Quality

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

l   The Contractor should provide proper mitigation measures in order to avoid stagnant water accumulation within works area and conduct regular site inspection of site conditions, especially after rainfall.

 

5.1.5       Chemical and Waste Management

l   Housekeeping on site should be improved. General refuse accumulated at the collection bins placed at site office area and at gate should be removed off site regularly. Steel scrap was found scattered on the ground at steel fixing area. Steel scrap should be properly collected in collection bin and additional collection bin should be provided in order to ease the recycling. Steel wastes accumulated inside the collection bin should be removed off-site regularly.

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

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

 

 

5.1.6       Others

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

 


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, total of 6194.53 tones of inert/non-inert C&D materials and C&D wastes were generated on site in the reporting month. 5902.15 tones were mixed hard rock and soil generated on site and disposed of at Public Fill (Tuen Mun Area 38 Fill Bank). 285.82 tones were used bentonite slurry and disposed of at Public Fill (Tseung Kwan O Area 137 Fill Bank). No 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. No chemical waste was generated and collected by licensed chemical waste collectors. 6.56 tons 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 housekeeping in the site area 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/B

02/11/09

--

-  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

22/01/10

31/01/15

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

WDO

Chemical Waste Producer Registration

WPN5213-269-C3572-01

23/10/2009

--

-  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-RW0500-09

13/11/09

01/05/10

-  Whole Construction Site for Contract DC/2009/05

NCO

Construction Noise Permit

GW-RW0038-10

23/01/10

22/07/10

-  Whole Construction Site 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. Most 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, except the measured noise levels recorded on 5, 18 and 23 February 2010 during night-time period.

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

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

According to the information provided by the Contractor, the following plants were operating within the Project site on exceedance days:

l   A hydraulic extractor, a generator and three water pumps (electric) on 5 February 2010.

l   A hydromill, two generators and three water pumps (electric) on 18 February 2010.

l   A hydromill, a generator, a excavator and two water pumps (electric) on 23 February 2010.

Types and number of PMEs operated on exceedance days comply with the requirements in the CNP (Ref: GW-RW0038-10).

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

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

Meanwhile, the Contractor is reminded to strictly implement all noise mitigation measures as stated in the EIA, 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 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 Restricted Hours on 5, 18 and 23 February 2010.

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 Months

6.1.1       The major construction works in March and April 2010 will be:

l  Drainage work;

l  Steel cage fixing work;

l  Welding work;

l  Tree transplanting and protection;

l  Mobilization of labours and plants;

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

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

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

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

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

l  Construction water pipe from Admin Building to launching shaft region;

l  Pre-drilling for mini-piles at main pumping station;

l  Carrying out toe-grouting for diaphragm wall at main pumping station;

l  Condition survey for riser shaft.

l  Construction of guide wall for interconnection tunnel; and

l  Diaphragm wall installation for interconnection tunnel.

 

 

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 oils and chemicals on site;

-       Chemical and waste management;

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

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

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

-       Accumulation of stagnant water in site area should be avoided;

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

-       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 March 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, except the measured noise levels recorded on 5, 19 and 23 February 2010 during night-time period.

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

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

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

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

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

No public complaints have been received in relation to the construction noise from the site during the restricted Restricted Hours on 5, 19 and 23 February 2010.

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

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

7.1.8       Referring to the Contractor’s information, no environmental complaint, and no notification of summons and prosecution was received in the reporting month.

 


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

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

 

Construction Noise Impact

l   The Contractor should ensure that valid Construction Noise Permits were posted at all site entrances.

 

Water Quality Impact

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

l   The Contractor should provide proper mitigation measures in order to avoid stagnant water accumulation within works area and conduct regular site inspection of site conditions, especially after rainfall.


Chemical and Waste Management

l   Housekeeping on site should be improved. General refuse accumulated at the collection bins should be removed off site regularly. Steel scrap scattered within the site area should be properly collected in collection bin and additional collection should be provided in order to ease the recycling. Steel wastes accumulated inside the collection bin should be removed off-site regularly.

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

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

 

Landscape and Visual Impact

l   The Contractor was recommended to carry out proper tree protection works to existing trees within Portion 1 area as soon as possible.

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

 

Others

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

 

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


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