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CONTENTS

RuleBentDown

EXECUTIVE SUMMARY.................................................................... 1

1        INTRODUCTION....................................................................... 3

2        PROJECT INFORMATION......................................................... 4

2.1     Project Organization and Management Structure.......................... 4

2.2     Construction Progress.......................................................................... 4

2.3     Mitigation Measures............................................................................. 4

2.4     Status of License and Permit.............................................................. 4

3        SUMMARY OF EM&A REQUIREMENT...................................... 5

3.1     Air Quality............................................................................................... 5

3.2     Noise....................................................................................................... 9

3.3     Water Quality....................................................................................... 12

4        MONITORING RESULT........................................................... 19

4.1     Air Quality............................................................................................. 19

4.2     Noise..................................................................................................... 21

4.3     Water Quality Monitoring................................................................... 22

4.4     Summary of Project-Related Exceedances.................................. 31

5        WASTE MANAGEMENT......................................................... 31

6        NON-COMPLIANCE AND DEFICIENCY................................... 32

6.1     Site Audit by ET................................................................................... 32

7        COMPLAINT........................................................................... 33

8        SUMMARY OF NOTIFICATION OF SUMMONS, SUCCESSFUL PROSECUTIONS AND CORRECTIVE ACTIONS....................... 34

9        FUTURE KEY ISSUE.............................................................. 34

 


TABLES

Table 3‑1      Air Quality Monitoring Equipment

Table 3‑2      Air Quality Monitoring Locations

Table 3‑3      Action & Limit Levels for Air Quality

Table 3‑4      Event/Action Plan for Air Quality

Table 3‑5      Noise Monitoring Equipment

Table 3‑6      Noise Monitoring Locations

Table 3‑7      Action & Limit Levels for Noise

Table 3‑8      Event/Action Plan for Noise

Table 3‑9      Water Quality Monitoring Equipment

Table 3‑10    Water Quality Monitoring Locations

Table 3‑11    Action/Limit Levels for Water Quality

Table 3‑12    Event/Action Plan for Water Quality

Table 4-1      Air Quality Monitoring Results

Table 4-2      Noise Monitoring Results

Table 4-3      Summary of Exceedances for I-1

Table 4-4      Summary of Exceedances for I-2

Table 4-5      Summary of Exceedances for I-3

Table 4-6      Water Quality Monitoring Results

Table 4-7      Summary of Project-Related Exceedances

Table 5-1      Waste Generated in January 2010

Table 6-1      Site Inspection by ET

Table 7-1      Cumulative Statistic of Environmental Complaint

Table 8-1      Cumulative Statistics of Notification of Summons and Successful Prosecutions

 

APPENDICES

Appendix A        Site Map and Works Area

Appendix B        Organization Chart

Appendix C        Construction Programme

Appendix D        Implementation Status of Environmental Mitigation Measures

Appendix E        Status of License and Permit

Appendix F        Calibration Certificates

Appendix G        Monitoring Locations

Appendix H        EM&A Schedule

Appendix I          Monitoring Results

Appendix J         Interim Notifications of Environmental Quality Limits Exceedances

Appendix K        Complaint Log

 

EXECUTIVE SUMMARY

1.         Drainage Services Department (DSD) has awarded the contract for the Design and Construction of Tsuen Wan Drainage Tunnel (hereafter referred to as the “Project”) to Maeda-CREC-SELI Joint Venture (MCSJV).  MCSJV has appointed Hyder Consulting Limited (HCL) as the Environmental Team (ET) to undertake the Environmental Monitoring and Audit (EM&A) works in accordance with the Environmental Monitoring and Audit Manual (EM&A Manual) and Environmental Permit (EP).  Commencement of the construction work had been notified to the Environmental Protection Department (EPD) in January 2008.  This Monthly EM&A Report summarises the EM&A works undertaken in January 2010.

2.         According to the EM&A Manual, there are four designated air quality monitoring locations, five designated noise monitoring locations and four water quality monitoring locations during the construction phase: (i) Sik Sik Yuen Ho Fung College (ASR 1, NSR 1 and Intake I-1); (ii) Hong Hoi Chee Hong Temple (ASR 3, NSR 3 and Intake I-2); (iii) Squatters (NSR 6 and Intake I-3); (iv) Beach Tower (Long Beach Gardens) (ASR 8, NSR 8 and Outfall O-1); and (v) Greenview Terrace (Block 1) (ASR 9, NSR 9 and Outfall O-1).

3.         During the non restricted hours, major construction activities undertaken by the Contractor at TWDT included site cleaning and tidying and breaking up exiting boulder at I-1, I-2, I-3 and Outfall, soil nailing at I-1 and I-3; formation of access road at I-3 and Outfall; Excavation and Lateral Support (ELS) at I-1; construction of skin wall, formation of man access shaft and formation of steel platform and gantry crane at I-2, and construction of launching chamber at Outfall. No construction activities were carried out during restricted hours.

4.         No exceedances have been recorded for air quality monitoring during the reporting month. For noise monitoring, no exceedance of Limit Level was recorded, but two environmental complaints on noise triggered the exceedance of Action Level during the reporting month.

5.          Exceedances for water quality monitoring are summarized in the following table:

Parameter

Action Level Exceedance

Limit Level Exceedance

DO

Nil

Nil

Turbidity

Nil

One recorded at I-1 on 6 January 2010.

SS

Two recorded at I-1 on 22 and 27 January 2010.

One recorded at I-1 on 6 January 2010.

 

6.         The exceedances were considered not to be project-related as no direct disturbance was observed contributed by the project construction activities. Detail interpretation could be referred to Section 4.3 of this report.

7.         The status of waste generation in the reporting month are:

·         A total of 1,753.3 m3 C&D material was disposed of to public fill at Tuen Mun and 2,750 m3 inert C&D materials were reused in other Contracts. Detail information could be referred to Section 5.1.1 of this report.

·         About 6.4 m3 general waste was disposed of to NENT Landfill;

·         300 kg paper/cardboard packaging was recycled;

·         No  metals was generated in the reporting month;

·         No  plastic waste was disposed of in the reporting month; and

·         No chemical waste was disposed of in the reporting month.

8.         In this reporting month, two site inspections and one monthly site audit were carried out by ET and Independent Environmental Checker (IEC) respectively, to ensure proper implementation of environmental mitigation measures specified in the EM&A Manual and compliance with environmental legislation.  All observations, which were recorded on the inspection checklists, were passed to the Contractor together with the ET’s recommendations.

9.         As advised by the Contractor and verified by ET:

·         No non-compliance regarding the site inspection was received in the reporting month;

·         Three environmental complaints were received during the reporting month; and

·         No summons and prosecution was received in this reporting month.

10.       The major construction works for the upcoming three months will be:

 

·         Site cleaning and tidying at I-1, I-2, I-3 and Outfall;

·         Soil nailing at I-3;

·         Breaking up exiting boulder at I-1, I-2, I-3, and Outfall;

·         Formation of access road at I-3 and Outfall;

·         Erosion control mat and green wire mesh at Outfall;

·         Construction of skin wall at I-2;

·         Formation of steel platform and gantry crane at I-2;

·         Formation of shafts at I-2;

·         Formation of Noise Enclosure at I-2 and Outfall; and

·         Construction of launching chamber at Outfall.

 

1                     INTRODUCTION

1.1.1                 The Drainage Services Department (DSD) proposed to construct a tunnel with an internal diameter of 6.5m and a length of 5.13km, with the purpose to alleviate the flooding risk in Tsuen Wan and Kwai Chung.

1.1.2                 This project is a Designated Project under Schedule 2 Part I Category Q, of the Environmental Impact Assessment Ordinance (EIAO) as part of the proposed Tsuen Wan Drainage Tunnel (TWDT) passes underneath the existing Tai Mo Shan Country Park.  An Environmental Impact Assessment (EIA) Study has therefore been undertaken to provide information on the nature and extent of environmental impacts arising from the construction and operation of the proposed designed project and related activities taking place concurrently.  From the EIA the recommendations for monitoring contained herein, are made.

1.1.3                 The Maeda-CREC-SELI Joint Venture (MCSJV) was awarded by DSD with the Contract – Design and Construction of Tsuen Wan Drainage Tunnel.

1.1.4                 Hyder was commissioned by the MCSJV as the Environmental Team (ET) to implement an EM&A program in accordance with the EM&A Manual.  The proposed tunnel section flows from the junction of Shing Mun Road and Wo Yi Hop Road and discharges to south of Yau Kom Tau underneath Castle Peak Road as shown in Appendix A.

1.1.5                 The construction works of the Project was commenced in January 2008.  This is the twenty-second monthly EM&A report summarising the impact monitoring results and audit findings of the EM&A program in January 2010.

 

2                     PROJECT INFORMATION

2.1               Project Organization and Management Structure

2.1.1                 The organization chart and lines of communication with respect to the on-site environmental management are shown in Appendix B.

2.2               Construction Progress

2.2.1                 The overall project programme from the detail design to completion of all civil works shall take approximately 54 months.  The construction programme is presented in Appendix C.

2.2.2                 The major construction activities undertaken in the reporting month were:

·          Site cleaning and tidying at I-1, I-2, I-3 and Outfall;

·          Soil nailing at I-1 and I-3;

·          Breaking up exiting boulder at I-1, I-2, I-3 and Outfall;

·          Formation of access road at I-3 and Outfall;

·          Excavation and Lateral Support (ELS) at I-1;

·          Construction of skin wall at I-2;

·          Formation of man access shaft at I-2;

·          Formation of steel platform and gantry crane at I-2; and

·          Construction of Launching Chamber at Outfall.

2.2.3                No construction activities were undertaken for TWDT during the restricted hours.

2.3               Mitigation Measures

2.3.1                The implemented environmental mitigation measures and their statuses are given in Appendix D.

2.4               Status of License and Permit

2.4.1                A summary of relevant permits and licences for the Project is given in Appendix E.

3                     SUMMARY OF EM&A REQUIREMENT

3.1               Air Quality

Air Quality Parameters

3.1.1                1-hour Total Suspended Particulates (TSP) levels are measured at the designated air monitoring locations in accordance with the EM&A Manual. Information such as date of monitoring, duration, weather condition, equipment used and monitoring results were recorded on the field data sheet developed for the Project. The monitoring results are presented in Section 4.

Monitoring Methodology

3.1.2                1-hour TSP monitoring is carried out under typical weather conditions (with no adverse weather such as typhoon signal or rain storm warning) three times every six days using High Volume Air Samplers (HVASs).  Monitoring should be conducted in accordance with the standard sampling method as set out in High Volume Method for Total Suspended Particulates, Part 50 Chapter 1 Appendix B, Title 40 of the Code of Federal Regulations of the USEPA.

3.1.3                After each sampling, the filter paper loaded with dust is kept in a clean and tightly sealed plastic bag. The filter paper is then re-conditioned in desiccators for 24 hours before obtaining the weight under laboratory conditions.

3.1.4                The average concentrations of the TSP are calculated based on the following information obtained from monitoring:

·         Flow rate;

·         Weight of the filter paper before and after sampling; and

·         Sampling period indicated by the elapsed-time meter.

3.1.5                All samples should be kept in good condition (i.e. stored in sealed plastic bags, with brief description of the monitoring dates and locations) for a period of 6 months before disposal.  Sample analysis is carried out by ALS Technichem (HK) Pty Limited (HOKLAS Registration Number 066).

Monitoring Equipment and Calibration

3.1.6                High Volume Air Samplers (HVASs) are used for 1-hour TSP monitoring to comply with the USEPA specifications in Appendix B Part 5 - Reference Method for the Determination of Suspended Particulate matter in the Atmosphere (High-Volume Method) of the Code of Federal Regulation dated June 1, 1991.

3.1.7                All HVASs are calibrated before commencement of monitoring using standard orifice 5-points calibration method with orifice calibrator to determine the actual flow rate of each HVAS.  This shall be used for the calculation of the TSP level.  Calibration Kit Model - TE5025A is used for calibration of the HVAS.  Recalibration of the HVAS shall be carried out after motor maintenance, at least once every six months, which is about the expected life of carbon brush. The air quality monitoring equipment used during the reporting month is shown in Table 3‑1 below.  The calibration certificates are included in Appendix F.

Equipment Type

Model

Serial Number

Calibration Orifice Number

Location

HVAS

BM2000HX

4994

1559

ASR 1

HVAS

BM2000HX

5875

1559

ASR 3

HVAS

TE5005X

0390

1559

ASR 8

HVAS

TE5005X

0646

1559

ASR 9

Table 3‑1         Air Quality Monitoring Equipment

Monitoring Location

3.1.8                Four designated air quality-monitoring locations were identified in the contract specific EM&A manual.  They are listed in Table 3‑2 below and shown in Appendix G.

 

Monitoring Station ID

Name of Premises

Floor Level

ASR1

Sik Sik Yuen Ho Fung College

G/F

ASR3

Hong Hoi Chee Hong Temple

Podium

ASR8

Beach Tower (Long Beach Gardens)

G/F

ASR9

Greenview Terrace (Block 1)

G/F

Table 3‑2         Air Quality Monitoring Locations

Action and Limit Levels

3.1.9                The Action and Limit Levels for the 1-hour TSP monitoring is shown in Table 3‑3.  In case exceedances of Action and/or Limit levels for air quality occur, Event Contingency Plans (ECPs) would be implemented.  The ECPs for Action and Limit levels exceedances are shown in Table 3‑4.

Station

1-hr TSP Level in μg/m3

Action Level

Limit Level

ASR 1

307

500

ASR 3

327

500

ASR 8

337

500

ASR 9

329

500

Table 3‑3         Action & Limit Levels for Air Quality

EVENT

ACTION

ET

IEC

SOR

CONTRACTOR

ACTION LEVEL

Exceedance for one sample

·  Identify source, investigate the causes of exceedance and propose remedial measures;

·  Inform IEC and SOR;

·  Repeat measurement to confirm finding;

·  Increase monitoring frequency to daily.

·  Check monitoring data submitted by ET;

·  Check Contractor’s working method.

·  Notify Contractor.

·  Rectify any unacceptable practice;

·  Amend working methods if appropriate.

Exceedance for two or more consecutive samples

·  Identify source;

·  Inform IEC and SOR;

·  Advise SOR on the effectiveness of the proposed remedial measures;

·  Repeat measurements to confirm findings;

·  Increase monitoring frequency to daily;

·  Discuss with IEC and Contractor on remedial actions required;

·  If exceedance continues, arrange meeting with IEC and SOR;

·  If exceedance stops, cease additional monitoring.

·  Check monitoring data submitted by ET;

·  Check Contractor’s working method;

·  Discuss with ET and Contractor on possible remedial measures;

·  Advise the ET on the effectiveness of the proposed remedial measures;

·  Supervise Implementation of remedial measures.

·  Confirm receipt of notification of exceedance in writing;

·  Notify Contractor;

·  Ensure remedial measures properly implemented.

 

·  Submit proposals for remedial to SOR within 3 working days of notification;

·  Implement the agreed proposals;

·  Amend proposal if appropriate.

LIMIT LEVEL

Exceedance for one sample

·  Identify source, investigate the causes of exceedance and propose remedial measures;

·  Inform IEC, SOR, Contractor and EPD;

·  Repeat measurement to confirm finding;

·  Increase monitoring frequency to daily;

·  Assess effectiveness of Contractor’s remedial actions and keep IEC, EPD and SOR informed of the results.

·  Check monitoring data submitted by ET;

·  Check Contractor’s working method;

·  Discuss with ET and Contractor on possible remedial measures;

·  Advise SOR on the effectiveness of the proposed remedial measures;

·  Supervise implementation of remedial measures.

·  Confirm receipt of notification of exceedance in writing;

·  Notify Contractor;

·  Ensure remedial measures properly implemented.

·  Take immediate action to avoid further exceedance;

·  Submit proposals for remedial actions to IEC within 3 working days of notification;

·  Implement the agreed proposals;

·  Amend proposal if appropriate.

Exceedance for two or more consecutive samples

·  Notify IEC, SOR, Contractor and EPD;

·  Identify source;

·  Repeat measurement to confirm findings;

·  Increase monitoring frequency to daily;

·  Carry out analysis of Contractor’s working procedures to determine possible mitigation to be implemented;

·  Arrange meeting with IEC and SOR to discuss the remedial actions to be taken;

·  Assess effectiveness of Contractor’s remedial actions and keep IEC, EPD and SOR informed of the results;

·  If exceedance stops, cease additional monitoring.

·  Discuss amongst SOR, ET, and Contractor on the potential remedial actions;

·  Review Contractor’s remedial actions whenever necessary to assure their effectiveness and advise SOR accordingly;

·  Supervise the implementation of remedial measures.

·  Confirm receipt of notification of exceedance in writing;

·  Notify Contractor;

·  In consultation with the IEC, agree with the Contractor on the remedial measures to be implemented;

·  Ensure remedial measures properly implemented;

·  If exceedance continues, consider what portion of the work is responsible and instruct the Contractor to stop that portion of work until the exceedance is abated.

·  Take immediate action to avoid further exceedance;

·  Submit proposals for remedial actions to IEC within 3 working days of notification;

·  Implement the agreed proposals;

·  Resubmit proposals if problem still not under control;

·  Stop the relevant portion of works as determined by SOR until the exceedance is abated.

Table 3‑4         Event/Action Plan for Air Quality

3.2               Noise

Noise Parameters

3.2.1                 The construction noise level is measured in terms of equivalent A-weighted sound pressure level (Leq) measured in decibels (dB(A)).  Monitoring of Leq(30 min) is carried out at the noise monitoring locations on a weekly basis during normal construction working hours (0700-1900 hours from Monday to Saturday except public holidays).  For all other time periods (i.e. restricted hours), Leq(5 min) would be employed for comparison with the Noise Control Ordinance (NCO) criteria if necessary.

3.2.2                 The two statistical sound levels L10 and L90: the level exceeded for 10 and 90 percent of the time respectively, are also recorded during monitoring.  Major noise sources observed, both on-site and off-site, are recorded on the field data sheet.  All measurements are recorded to the nearest 0.1 dB(A) and presented in round numbers in this report.  Results are presented in Section 4.

Monitoring Methodology

3.2.3                 Sound level meters, which comply with the International Electrotechnical Commission Publication 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications as referred to the Technical Memorandum (TM) issued under the Noise Control Ordinance, are used.  Noise levels for the A-weighted levels Leq(30min), L10 and L90 are measured throughout the impact monitoring.  Average, by sound power, of six consecutive 5 minutes readings is used to provide Leq(30 min) for non-restricted hours (07:00-19:00 hours from Monday to Saturday except public holidays).  A facade correction of 3dB(A) is applied to the measurements that are carried out under free field conditions.

3.2.4                 During the impact monitoring, parameters such as dates, weather condition, equipment used, measurement results and major noise sources are recorded on the field data record sheet.  Monitoring would not be carried out in the presence of fog, rain or strong wind with a steady speed exceeding 5 m/s.  In relation to the monitored noise levels, other noise sources such as road traffic might make a significant contribution to the overall noise environment.  Therefore, noise monitoring activities would take into account such influencing factors, which were not present during the baseline monitoring period. 

Monitoring Equipment and Calibration

3.2.5                 Rion Precision Sound Level Meters of Type NA-27 and Type NL-18 in compliance with the International Electrotechnical Commission Publication 651: 1979 (Type 1) and 804: 1985 (Type 1) Specifications, stated in the Technical Memorandum (TM) issued under the NCO, are used for noise monitoring in this reporting month. 

3.2.6                 Prior to and following each noise measurement, the accuracy of the sound level meters is checked using an acoustic calibrators (Rion Type NC-73) generating a known sound pressure level at a known frequency.  Measurements are considered as valid only if the calibration levels from before and after the noise measurement agrees to within 1.0 dB(A).  The sound level meters and the calibrator are calibrated annually to ensure they perform to the same level of accuracy as stated in the manufacturer’s specifications.  The noise monitoring equipment used during the reporting month is shown in Table 3‑5 below.  The calibration certificates are included in Appendix F.

Equipment Type

Manufacturer

Type Number

Serial Number

Location

Sound Level Meter

Rion

NA-27

00201194

NSR1, NSR3, NSR6, NSR8 and NSR9

 

Sound Level Meter

Rion

NL-18

00360030

Sound Level Calibrator

Rion

NC-73

10786708

Sound Level Calibrator

Rion

NC-73

10997142

Table 3‑5         Noise Monitoring Equipment

Monitoring Location

3.2.7                 Five designated noise monitoring locations were identified in the contract specific EM&A manual.  They are listed in Table 3‑6 below and shown in Appendix G.  All the locations below are in façade measurement.

Monitoring Station ID

Name of Premises

Floor Level

NSR1

Sik Sik Yuen Ho Fung College

G/F

NSR3

Hong Hoi Chee Hong Temple

Podium

NSR6

Squatters

G/F

NSR8

Beach Tower (Long Beach Gardens)

G/F

NSR9

Greenview Terrace (Block 1)

Podium (up to 6 July2009)

Roof* (from 16 July 2009)

* The noise monitoring location of NSR9 had been adjusted at rooftop from 16 July 2009.

Table 3‑6         Noise Monitoring Locations

Construction Groundborne Noise

3.2.8                 Prediction of construction groundborne noise indicates the criteria will be achieved at most NSRs except exceedances are predicted at Hong Hoi Chee Hong Temple (NSR3) and Squatters (NSR6).  It is recommended to restrict the TBM operation in non-restricted period (i.e. 0700 - 1900) at these NSRs. In order to ensure proper control of groundborne noise is executed by the contractor, a monitoring requirement is recommended at the Hong Hoi Chee Hong Temple at Intake 2 and Squatters at Intake 3 for compliance checking.  According to the monitoring schedule, TBM operation will be carried out for about 3 months in the vicinity of Hong Hoi Chee Hong Temple at Intake 2 and Squatters at Intake 3.  If groundborne noise criterion is exceeded, the monitoring shall continue daily until acceptance has been restored against the criterion.  Otherwise the monitoring can be discontinued. 

3.2.9                 The criteria including Technical Memorandum for the Assessment of Noise from Places other than Domestic Premises, Public Places or Construction Sites (TM-Places) under the NCO stipulates that noise transmitted primarily through the structural elements of building, or buildings, shall be 10 dB(A) less than the relevant ANLs.  Daytime groundborne construction noise criterion of 60 dB(A) therefore applies with reference to TM-EIAO 70 dB(A) criterion for schools and taking account of the minus 10 dB(A) requirement under the NCO TM-Places.  Following the same principle for groundborne noise criteria, groundborne construction noise levels inside domestic premises relying on opened window for ventilation will be limited to 65 dB(A), with reference to the daytime airborne noise criterion of 75 dB(A) in accordance with TM-EIAO.

Action and Limit Levels

3.2.10              The Action and Limit levels for construction noise are defined in Table 3‑7.  If non-compliance of the criteria occurs, actions in accordance with the Action Plan in Table 3‑8 would be carried out.

Time Period

Action

Limit

0700 – 1900 hrs on normal weekdays

When one documented complaint is received

75 dB(A)*

*           For educational establishments the limit level shall be 70dB(A) and reduced to 65dB(A) during examination periods between 0700-1900 hrs on normal weekdays.

Table 3‑7         Action & Limit Levels for Noise

Event

Action

ET Leader

IEC

SOR

Contractor

Action Level

·  Notify IEC and the Contractor.

·  Carry out investigation.

·  Report the results of investigation to IEC and the Contractor.

·  Discuss with the Contractor and formulate remedial measures.

·  Increase monitoring frequency to check mitigation measures.

·  Review with analysed results submitted by ET.

·  Review the proposed remedial measures by the Contractor and advise SOR accordingly.

·  Supervise the implement of remedial measures.

·  Confirm receipt of notification of exceedance in writing.

·  Notify the Contractor.

·  Require the Contractor to propose remedial measures for the analysed noise problem.

·  Ensure remedial measures are properly implemented.

·  Submit noise mitigation proposals to IEC.

·  Implement noise mitigation proposals.

Limit Level

·  Identify the source.

·  Notify IEC, SOR, EPD and the Contractor.

·  Repeat measurement to confirm findings.

·  Increase monitoring frequency.

·  Carry out analysis of Contractor’s working procedures to determine possible mitigation to be implemented.

·  Inform IEC, SOR, and EPD the causes & actions taken for the exceedances.

·  Assess effectiveness of the Contractor’s remedial actions and keep IEC, EPD and SOR informed of the results.

·  If exceedance stops, cease additional monitoring.

·  Discuss amongst SOR, ET Leader and the Contractor on the potential remedial actions.

·  Review the Contractor’s remedial actions whenever necessary to assure their effectiveness and advise SOR accordingly.

·  Supervise the implementation of remedial measures.

·  Confirm receipt of notification of exceedance in writing.

·  Notify the Contractor.

·  Require the Contractor to propose remedial measures for the analysed noise problem.

·  Ensure remedial measures are properly implemented.

·  If exceedance continues, consider what activity of the work is responsible and instruct the Contractor to stop that activity of work until the exceedance is abated.

·  Take immediate action to avoid further exceedance.

·  Submit proposals for remedial actions to IEC within 3 working days of notification.

·  Implement the agreed proposals.

·  Resubmit proposals if problem still not under control.

·  Stop the relevant activity of works as determined by the SOR until the exceedance is abated.

Table 3‑8         Event/Action Plan for Noise

3.3               Water Quality

3.3.1                 The water quality impact would be insignificant with the protection measures recommended in Section 5.6 of the EIA report.  However in view of the sensitive nature of the rivers/streams and bathing beaches in the Study Area, it is suggested that a programme of monitoring should be established to confirm the mitigation measures are protecting these water bodies.

Water Quality Parameters

3.3.2                 Monitoring for Dissolved Oxygen (DO), temperature, turbidity, pH and suspended solids (SS) should be undertaken at designated monitoring locations.  It should be noted that DO, temperature, turbidity and pH should be measured in-situ whereas SS is assayed in a laboratory.

3.3.3                 In association with the water quality parameters, other relevant data should also be measured, such as monitoring location/position, time, weather conditions, and any special phenomena and description of work underway at the construction site etc.

 

Monitoring Methodology

3.3.4                 In accordance with the EM&A Manual, the water quality monitoring for all specified parameters shall be measured at all designated monitoring locations including control points at an interval of 3 days per week.  DO, temperature, turbidity, pH and SS shall be undertaken at designated monitoring locations.

3.3.5                 It should be noted that water samples for all monitoring parameters should be collected, stored, preserved and analysis according to Standard Methods, APHA 17 ed. and/or methods agreed by the Director of Environmental Protection.  

3.3.6                 Each sample shall be analysed in accordance with the APHA Standard Methods for the Examination of Water and Wastewater, 18th edition, or an equivalent method approved by the EPD.  If an in-house or non-standard method is proposed, details of the method verification may require to be submitted to the EPD.  In any circumstance, the sample testing should comply with a comprehensive quality assurance and quality control programme.  The laboratory should be prepared to demonstrate the quality programmes to the EPD when requested.

Monitoring Equipment and Calibration

3.3.7                 All the water samples collected should be transferred to clearly labelled and pre-cleaned sample containers with necessary preservatives immediately after collection.  The sample containers should be provided by a HOKLAS accredited laboratory.  Sufficient quantity of samples should be collected for all laboratory analyses.  Following sampling, samples should be stored in a cool box at temperature of between 0 and 4oC, and transported to the laboratory within the sample retention time as advised by the laboratory under proper chain-of-custody system.  The water quality monitoring equipment used during the reporting month is shown in Table 3‑9 below.

Equipment Type

Manufacturer

Model

Quantity

pH Meter / DO / Temperature Meter

WTW

PH/Oxi 340i

1

Tuibidimeter

EUTECH

TN-100

1

Table 3‑9         Water Quality Monitoring Equipment

3.3.8                 All pH meters, DO meters and turbidimeters shall be checked and calibrated prior to use.  DO meters and turbidimeters shall be calibrated by a laboratory accredited under HOKLAS or any other international accreditation scheme, and subsequently re-calibrated at 3 monthly intervals throughout all stages of the water quality monitoring.  Responses of sensors and electrodes shall be checked with certified standard solutions before each use.  Wet bulb calibrations for all DO meters shall be carried out before measurement at each monitoring location.  For the on site calibration of field equipment, BS 127:1993, "Guide to field and on-site test methods for the analysis of waters" should be observed.  The calibration certificates are included in Appendix F.

 

Monitoring Location

3.3.9                 Four designated monitoring locations were identified in the contract specific EM&A Manual for water quality monitoring.  While the construction of the outfall basin at the seashore has not been started, monitoring of marine water quality is only required during which the stilling basin is placed at the seashore area.  These four monitoring stations are listed in Table 3‑10 below and shown in Appendix G. 

Monitoring Station ID

Name of Premises

I-1

Intake I-1

I-1-C

Control of Intake I-1

I-2

Intake I-2

I-2-C

Control of Intake I-2

I-3

Intake I-3

I-3-C*

Control of Intake I-3

O-1 (FT) & (ET)

Outfall 1During Flood Tide and Ebb Tide

O-1-C (FT)

Control of Outfall O-1 During Flood Tide

O-1-C (ET)

Control of Outfall O-1 During Ebb Tide

*The upper stream location (I-3-C*) had been relocated from end of February 2009 due to coarse stone blockage.

Table 3‑10       Water Quality Monitoring Locations

3.3.10               Note that there are two control stations for Outfall O-1, one for sampling during flood tide and one for sampling during ebb tide.  Only one of those control stations for Outfall O-1 shall be sampled during each sampling.  Control station to be sampled will be determined based on the tidal information provided by the Hong Kong Observatory. 

Action and Limit Levels

3.3.11               The Action and Limit levels for water quality monitoring parameters are defined in Table 3‑11.  In case of any exceedance, appropriate actions will be undertaken in accordance with the Event and Action Plan as described in Table 3‑12.

Parameters

Action

Limit

DO in mg/l

(Surface, Middle & Bottom)

Surface & Middle

5%-ile of baseline data for surface

and middle layer.

 

Bottom

5%-ile of baseline data for bottom layer.

Surface & Middle

4mg/l except 5mg/l for FCZ or

1%-ile of baseline data for surface and middle layer

Bottom

2mg/l or 1%-ile of baseline data for bottom layer

SS in mg/l

(depth-averaged)

95%-ile of baseline data or 120% of upstream control station’s SS at the same tide of the same day

99%-ile of baseline or 130% of upstream control station’s SS at the same tide of the same day and specific sensitive receiver water quality requirements (e.g. required suspended solids levels for concerned sea water intakes)

Turbidity (Tby) in NTU (depth-averaged)

95%-ile of baseline data or 120% of upstream control station’s Tby at the same tide of the same day

99%-ile of baseline or 130% of upstream control station’s Tby at the same tide of the same day

Notes:

·         For DO, non-compliance of the water quality limits occurs when monitoring result is lower than the limits.

·         For SS and Tby, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.

·         All the figures given in the table are used for reference only and the EPD may amend the figures whenever it is considered as necessary.

Table 3‑11       Action/Limit Levels for Water Quality

Event

ET Leader

IEC

SOR

Contractor

Action Level being exceeded by one sampling day

·  Repeat in-situ measurement to confirm finding;

·  Identify source(s) of impact;

·  Inform IEC and Contractor;

·  Check monitoring data, all plant, equipment and Contractor’s working methods;

·  Discuss mitigation measures with IEC and Contractor; and

·  Repeat measurement on next day of exceedance.

·  Discuss with ET and Contractor on the mitigation measures;

·  Review proposals on mitigation measures submitted by Contractor and advise the SOR accordingly; and

·  Assess the effectiveness of the implemented mitigation measures.

 

·  Discuss with IEC on the proposed mitigation measures; and

·  Make agreement on the mitigation measures to be implemented.

 

·  Inform the SOR and confirm notification of the non-compliance in writing;        

·  Rectify unacceptable practice;

·  Check all plant and equipment;

·  Consider changes of working methods;

·  Discuss with ET and IEC and propose mitigation measures to IEC and SOR; and

·  Implement the agreed mitigation measures.

Action Level being exceeded by more than one consecutive sampling day

·  Repeat in-situ measurement to confirm finding;

·  Identify source(s) of impact;

·  Inform IEC and Contractor;

·  Check monitoring data, all plant, equipment and Contractor’s working methods;

·  Discuss mitigation measures with IEC and Contractor;

·  Ensure mitigation measures are implemented;

·  Prepare to increase the monitoring frequency to daily; and

·  Repeat measurement on next day of exceedance.

·  Discuss with ET and Contractor on the mitigation measures;

·  Review proposals on mitigation measures submitted by Contractor and advise the SOR accordingly; and

·  Assess the effectiveness of the implemented mitigation measures.

 

·  Discuss with IEC on the proposed mitigation measures;

·  Make agreement on the mitigation measures to be implemented; and

·  Assess the effectiveness of the implemented mitigation measures.

·  Inform the Engineer and confirm notification of the non-compliance in writing;

·  Rectify unacceptable practice;

·  Check all plant and equipment;

·  Consider changes of working methods;

·  Discuss with ET and IEC and propose mitigation measures to IEC and SOR within 3 working days; and

·  Implement the agreed mitigation measures.

Limit Level being exceeded by one sampling day

·  Repeat in-situ measurement to confirm finding;

·  Identify source(s) of impact;

·  Inform IEC, Contractor and EPD;

·  Check monitoring data, all plant, equipment and Contractor’s working methods;

·  Discuss mitigation measures with IEC, SOR and Contractor;

·  Ensure mitigation measures are implemented; and

·  Increase the monitoring frequency to daily until no exceedance of Limit level.

·  Discuss with ET and Contractor on the mitigation measures;

·  Review proposals on mitigation measures submitted by Contractor and advise the SOR accordingly; and

·  Assess the effectiveness of the implemented mitigation measures.

 

·  Discuss with IEC, ET and Contractor on the proposed mitigation measures; and

·  Request Contractor to critically review the working methods;

·  Make agreement on the mitigation measures to be implemented; and

·  Assess the effectiveness of the implemented mitigation measures.

·  Inform the Engineer and confirm notification of the non-compliance in writing;

·  Rectify unacceptable practice;

·  Check all plant and equipment;

·  Consider changes of working methods;

·  Discuss with ET and IEC and SOR and propose mitigation measures to IEC and SOR within 3 working days; and

·  Implement the agreed mitigation measures.

Limit Level being exceeded by more than one consecutive sampling day

·  Repeat in-situ measurement to confirm finding;

·  Identify source(s) of impact;

·  Inform IEC, Contractor and EPD;

·  Check monitoring data, all plant, equipment and Contractor’s working methods;

·  Discuss mitigation measures with IEC, SOR and Contractor;

·  Ensure mitigation measures are implemented; and

·  7.         Increase the monitoring frequency to daily until no exceedance of Limit level for two consecutive days.

·  Discuss with ET and Contractor on the mitigation measures;

·  Review proposals on mitigation measures submitted by Contractor and advise the SOR accordingly; and

·  Assess the effectiveness of the implemented mitigation measures.

 

·  Discuss with IEC, ET and Contractor on the proposed mitigation measures; and

·  Request Contractor to critically review the working methods;

·  Make agreement on the mitigation measures to be implemented;

·  Assess the effectiveness of the implemented mitigation measures; and

·  Consider and instruct, if necessary, the Contractor to slow down or to stop all or part of the marine work until no exceedance of Limit Level.

·  Inform the SOR and confirm notification of the non-compliance in writing;

·  Rectify unacceptable practice;

·  Check all plant and equipment;

·  Consider changes of working methods;

·  Discuss with ET and IEC and SOR and propose mitigation measures to IEC and SOR within 3 working days;

·  Implement the agreed mitigation measures; and

·  As directed by the Engineer, to slow down or to stop all or part of the marine work or construction activities.

Table 3‑12       Event/Action Plan for Water Quality

4                     MONITORING RESULT

4.1               Air Quality

4.1.1          The air quality monitoring schedule of the reporting period is given in Appendix H. 

1-hr TSP Monitoring

4.1.2                Results of 1-hours TSP level are shown in Table 4-1.  All measurements were recorded to the nearest 0.1mg/m3 and presented in round numbers in this report.  Detail results including weather conditions, and graphical presentations are presented in Appendix I.

Station

Monitoring Date

Monitoring Result (mg/m3)

Action/Limit Levels (mg/m3)

ASR 1

05-Jan-10

70.5

307/500

89.7

89.7

11-Jan-10

105.0

55.1

78.1

15-Jan-10

44.8

119.1

116.6

21-Jan-10

106.3

87.1

58.8

27-Jan-10

76.9

129.4

79.4

ASR 3

05-Jan-10

64.7

327/500

183.2

109.9

11-Jan-10

103.8

30.5

35.4

15-Jan-10

41.5

92.8

108.7

21-Jan-10

102.6

100.1

37.9

27-Jan-10

57.4

72.1

72.1

ASR 8

05-Jan-10

110.8

337/500

145.2

56.0

11-Jan-10

173.2

33.1

19.1

15-Jan-10

25.5

98.1

119.7

21-Jan-10

150.3

67.5

43.3

27-Jan-10

86.6

118.4

126.1

ASR 9

05-Jan-10

91.6

329/500

111.8

117.1

11-Jan-10

145.4

13.5

21.5

15-Jan-10

67.3

78.1

117.1

21-Jan-10

129.3

52.5

41.7

27-Jan-10

88.9

57.9

84.8

Note: Italic indicates the occurrence of exceedance of Action level

Bold indicates the occurrence of exceedance of Limit Level

Table 4-1         Air Quality Monitoring Results

4.1.3                No project related exceedance was recorded in the reporting month.

4.2               Noise

4.2.1                The noise monitoring schedule of the reporting period is given in Appendix H.  Results of measured noise level, in terms of Leq (30min), during the construction are shown in Table 4-2. All measurements including L10 and L90 are recorded to the nearest 0.1 dB(A) and presented in round numbers in this report.  Detail results including weather conditions and graphical presentation are presented in Appendix I. 

Station

Monitoring Date

Leq (30 min) dB(A)

Limit Levels dB(A)

NSR 1

05-Jan-10

64.8

70/65**

12-Jan-10

64.2

21-Jan-10

68.3

27-Jan-10

63.7

NSR 3

05-Jan-10

64.7

75

12-Jan-10

63.1

21-Jan-10

68.0

27-Jan-10

69.3

NSR 6

05-Jan-10

54.4

12-Jan-10

69.7

21-Jan-10

73.4

26-Jan-10*

67.3

27-Jan-10

70.1

NSR 8

05-Jan-10

64.7

12-Jan-10

62.5

21-Jan-10

62.6

27-Jan-10

65.3

NSR 9

05-Jan-10

69.8

08-Jan-10*

70.4

12-Jan-10

74.5

15-Jan-10*

72.5

19-Jan-10*

64.0

21-Jan-10

68.9

26-Jan-10*

73.0

27-Jan-10

69.4

* Additional noise monitoring due to the documented complaints.

** Noise Limit level at NSR1 was reduced from 70 dB(A) to 65 dB(A) during examination period between 4 and 18 January 2010.

Table 4-2         Noise Monitoring Results

4.2.2                No exceedances of Limit Level were recorded during the reporting month.  However, EPD received two environmental complaints regarding daytime construction noise at Intake-3 construction site on 19 and 21 January 2010. Hence, they would be the Action Level exceedances. Details of the complaints are presented in Section 7 as well as the notification of exceedances enclosed in Appendix J.

4.2.3                There was a concern that a single noise measurement on 4 January 2010 during the ad-hoc noise monitoring recorded by SOR was above the criteria.  However, the following consecutive noise measurement during the same ad-hoc noise monitoring was well below the criteria.  In our following regular monitoring on 5 January 2010, it was also revealed that the noise level was well below the criteria and no anomalies were observed.  Thus, it was considered as an isolated event.  The Contractor was reminded to ensure the movable noise barrier placing close to the breaking tip during concrete breaking.

4.3               Water Quality Monitoring

4.3.1                 The water quality monitoring schedule of the reporting period is given in Appendix H.  Summaries of exceedances for water quality monitoring are provided in Table 4-3 to Table 4-5.

Parameter

Action Level Exceedance

Limit Level Exceedance

DO

Nil

Nil

Turbidity

Nil

One recorded on 6 January 2010.

SS

Two recorded on 22 and 27 January 2010.

One recorded on 6 January 2010.

Total

Two

Two

Table 4-3         Summary of Exceedances for I-1

Parameter

Action Level Exceedance

Limit Level Exceedance

DO

Nil

Nil

Turbidity

Nil

Nil

SS

Nil

Nil

Total

Nil

Nil

Table 4-4         Summary of Exceedances for I-2

Parameter

Action Level Exceedance

Limit Level Exceedance

DO

Nil

Nil

Turbidity

Nil

Nil

SS

Nil

Nil

Total

Nil

Nil

Table 4-5         Summary of Exceedances for I-3

4.3.2                 Results of measured water quality parameters during the reporting month are shown in Table 4-6 and detailed results including weather conditions and graphical presentations are enclosed in Appendix I.

4.3.3                 Four non-project related exceedances were recorded for the water quality monitoring within the reporting month.

4.3.4                 The exceedance of Baseline Limit Level of turbidity recorded at I-1 on 6 January 2010 was above baseline Action/Limit Levels as well as higher than the range of baseline turbidity concentration.  The exceedance of Baseline Limit Level of SS recorded at I-1 on 6 January 2010 were above baseline Action and Limit Levels as well as higher than the range of baseline SS concentration. Construction activities, such as disposal of C&D materials, site cleaning and tidying, as well as shotcrete to shaft wall, were undertaken during the measurements.  No direct disturbance was observed from the site. Thus, the exceedances of turbidity and SS levels recorded on 6 January 2010 at I-1 were considered to be contributed by the high turbidity and SS levels of control station (I-1-C) and no action should be taken as the turbidity and SS results at monitoring station were below the action and limit levels of control station.

4.3.5                 The exceedance of Control Action Level of SS (120% higher than I-1-C) recorded at I-1 on 22 January 2010 was below baseline Action/Limit Levels and within the range of baseline SS concentration.  Construction activities, such as site cleaning and tidying, disposal of C&D materials, shotcrete to shaft wall, and soil nailing for the support of Shing Mun Channel, were carried out during the measurements. No direct disturbance was observed from the site. Thus, the exceedance of SS level recorded on 22 January 2010 at I-1 was considered to be contributed by natural variation and no action was therefore required.

4.3.6                 Exceedance of Baseline Action Level of SS  was recorded at I-1 on 27 January 2010. The measured SS level was above baseline Action level but below Limit Level, it was within the range of baseline SS concentration. The construction activities undertaken during the measurement included site cleaning and tidying, soil nailing as well as shotcrete to shaft wall. No direct disturbance was observed from the site. Thus, the exceedance of SS level recorded on 27 January 2010 at I-1 was considered to be contributed by the high SS level of control station (I-1-C) and no action should be taken as the SS result at monitoring station was below the action and limit levels of control station.

4.3.7                 The  above mentioned  exceedances were  considered  as  non  project  related,  however,  proper mitigation measures had been implemented during measurements. Details of the above mentioned investigations could be referred to the notifications of exceedances as enclosed in Appendix J, which have been provided to the IEC for review.

 

Station

Date

Temperature

DO (mg/L)

Action/Limit Level for DO (mg/L)

pH

Turbidity (NTU)

Action/Limit Level for Turbidity (NTU)

SS (mg/L)

Action/Limit Level for SS (mg/L)

I-1

02-Jan-10

19.50

6.19

3.42 / 3.34

7.46

4.24

9.75 / 12.47

2.5

8.85 / 10.17

 

04-Jan-10

20.60

6.07

 

7.41

3.08

 

2.1

 

 

06-Jan-10

18.20

5.88

 

7.43

19.47

 

13.6

 

 

08-Jan-10

16.65

6.52

 

7.20

7.09

 

3.5

 

 

11-Jan-10

16.80

6.50

 

7.25

7.75

 

3.8

 

 

13-Jan-10

14.60

6.92

 

7.40

7.14

 

4.1

 

 

15-Jan-10

17.50

7.47

 

7.40

8.24

 

5.9

 

 

18-Jan-10

21.50

6.10

 

7.45

8.18

 

2.0

 

 

20-Jan-10

22.10

6.12

 

7.44

7.60

 

6.0

 

 

22-Jan-10

19.30

5.75

 

7.56

5.09

 

5.9

 

            

25-Jan-10

22.20

7.04

 

7.36

3.28

 

5.9

 

 

27-Jan-10

22.90

5.72

 

7.51

7.05

 

10.15

 

 

29-Jan-10

22.80

6.09

 

7.15

4.17

 

4.5

 

Station

Date

Temperature

DO (mg/L)

Action/Limit Level for DO (mg/L)

pH

Turbidity (NTU)

Action/Limit Level for Turbidity (NTU)

SS (mg/L)

Action/Limit Level for SS (mg/L)

I-1-C

02-Jan-10

19.45

6.07

- / -

7.46

4.59

- / -

2.4

- / -

 

04-Jan-10

20.65

6.18

 

7.41

3.21

 

2.0

 

 

06-Jan-10

18.00

6.10

 

7.43

19.67

 

16.3

 

 

08-Jan-10

16.80

6.44

 

7.20

7.99

 

4.0

 

 

11-Jan-10

16.65

6.51

 

7.25

7.96

 

4.3

 

 

13-Jan-10

14.50

6.98

 

7.41

7.22

 

3.9

 

 

15-Jan-10

17.10

7.38

 

7.41

8.68

 

5.7

 

 

18-Jan-10

21.70

6.16

 

7.48

8.46

 

2.0

 

 

20-Jan-10

22.00

5.91

 

7.44

7.37

 

6.2

 

 

22-Jan-10

19.20

5.84

 

7.55

5.43

 

4.8

 

 

25-Jan-10

21.95

7.18

 

7.39

3.45

 

5.5

 

 

27-Jan-10

23.00

6.02

 

7.52

7.16

 

9.5

 

 

29-Jan-10

22.55

6.30

 

7.16

4.27

 

4.4

 

Station

Date

Temperature

DO (mg/L)

Action/Limit Level for DO (mg/L)

pH

Turbidity (NTU)

Action/Limit Level for Turbidity (NTU)

SS (mg/L)

Action/Limit Level for SS (mg/L)

I-2

02-Jan-10

19.60

6.31

3.66 / 3.63

7.42

3.94

6.63 / 6.99

2.0

7.68 / 8.34

 

04-Jan-10

20.90

6.09

 

7.60

2.02

 

2.0

 

 

06-Jan-10

18.25

5.96

 

7.42

2.08

 

2.0

 

 

08-Jan-10

16.20

6.26

 

7.83

4.37

 

2.0

 

 

11-Jan-10

16.70

6.07

 

7.24

4.55

 

2.7

 

 

13-Jan-10

14.75

6.93

 

7.36

3.15

 

2.4

 

 

15-Jan-10

18.15

7.47

 

7.51

3.47

 

2.0

 

 

18-Jan-10

21.30

5.97

 

7.41

6.05

 

4.8

 

 

20-Jan-10

21.80

5.60

 

7.36

6.05

 

2.0

 

 

22-Jan-10

18.85

5.96

 

7.48

5.16

 

4.1

 

 

25-Jan-10

22.60

6.92

 

7.45

3.20

 

2.0

 

 

27-Jan-10

22.40

5.66

 

7.50

2.69

 

2.0

 

 

29-Jan-10

22.80

5.94

 

7.26

1.53

 

2.0

 

Station

Date

Temperature

DO (mg/L)

Action/Limit Level for DO (mg/L)

pH

Turbidity (NTU)

Action/Limit Level for Turbidity (NTU)

SS (mg/L)

Action/Limit Level for SS (mg/L)

I-2-C

02-Jan-10

19.80

6.40

- / -

7.42

4.19

- / -

2.0

- / -

 

04-Jan-10

20.80

6.43

 

7.61

2.14

 

2.0

 

 

06-Jan-10

18.20

5.89

 

7.40

2.11

 

2.0

 

 

08-Jan-10

16.45

6.33

 

7.85

4.56

 

2.0

 

 

11-Jan-10

16.50

6.13

 

7.23

4.80

 

2.3

 

 

13-Jan-10

14.65

7.16

 

7.38

3.41

 

2.2

 

 

15-Jan-10

18.05

7.53

 

7.39

3.69

 

2.3

 

 

18-Jan-10

21.10

6.04

 

7.40

6.12

 

4.7

 

 

20-Jan-10

21.75

5.69

 

7.36

6.15

 

2.0

 

 

22-Jan-10

19.30

6.20

 

7.48

5.40

 

4.0

 

 

25-Jan-10

22.50

6.96

 

7.49

3.48

 

2.0

 

 

27-Jan-10

22.70

5.66

 

7.50

2.80

 

2.0

 

 

29-Jan-10

22.55

6.04

 

7.22

1.62

 

2.0

 

Station

Date

Temperature

DO (mg/L)

Action/Limit Level for DO (mg/L)

pH

Turbidity (NTU)

Action/Limit Level for Turbidity (NTU)

SS (mg/L)

Action/Limit Level for SS (mg/L)

I-3

02-Jan-10

19.75

6.69

3.65 / 3.51

7.52

1.84

3.99 / 4.18

2.0

6.13 / 7.23

 

04-Jan-10

21.00

6.27

 

7.56

1.77

 

2.0

 

 

06-Jan-10

18.10

5.91

 

7.28

2.14

 

2.0

 

 

08-Jan-10

16.30

6.39

 

7.52

1.81

 

2.0

 

 

11-Jan-10

16.20

6.15

 

7.28

2.31

 

2.0

 

 

13-Jan-10

14.70

6.83

 

7.41

2.90

 

2.0

 

 

15-Jan-10

18.00

7.22

 

7.51

1.22

 

2.0

 

 

18-Jan-10

21.60

6.21

 

7.47

2.13

 

5.2

 

 

20-Jan-10

21.50

5.60

 

7.51

2.07

 

4.7

 

 

22-Jan-10

19.00

5.52

 

7.66

1.52

 

2.0

 

 

25-Jan-10

22.50

6.80

 

7.60

2.14

 

2.0

 

 

27-Jan-10

22.60

5.54

 

7.60

1.96

 

2.0

 

 

29-Jan-10

22.55

5.86

 

7.42

1.63

 

2.0

 

Station

Date

Temperature

DO (mg/L)

Action/Limit Level for DO (mg/L)

pH

Turbidity (NTU)

Action/Limit Level for Turbidity (NTU)

SS (mg/L)

Action/Limit Level for SS (mg/L)

I-3-C

02-Jan-10

19.75

6.66

- / -

7.50

1.98

- / -

2.0

- / -

 

04-Jan-10

20.85

6.45

 

7.55

1.92

 

2.0

 

 

06-Jan-10

18.00

6.26

 

7.30

2.20

 

2.0

 

 

08-Jan-10

16.10

6.36

 

7.51

1.96

 

2.0

 

 

11-Jan-10

15.90

6.33

 

7.27

2.38

 

2.1

 

 

13-Jan-10

14.50

6.82

 

7.40

2.98

 

2.0

 

 

15-Jan-10

18.20

7.34

 

7.50

1.37

 

2.0

 

 

18-Jan-10

21.80

6.15

 

7.46

2.19

 

5.0

 

 

20-Jan-10

21.60

5.70

 

7.50

2.58

 

4.7

 

 

22-Jan-10

19.00

5.65

 

7.68

1.67

 

2.0

 

 

25-Jan-10

22.70

6.90

 

7.60

2.68

 

3.1

 

 

27-Jan-10

22.50

5.65

 

7.61

2.05

 

2.0

 

 

29-Jan-10

22.95

5.93

 

7.40

1.64

 

2.0

 

Note:                Italic indicates the occurrence of exceedance of Action level.

                         Bold indicates the occurrence of exceedance of Limit level.

Table 4-6         Water Quality Monitoring Results

4.4               Summary of Project-Related Exceedances

4.4.1                 Table 4-7 summarises the project-related exceedance results recorded in January 2010.  Note that exceedances that are considered not related to the construction activities are not included in this table.

Environmental Monitoring

Total No. of Measurement

Action Level Exceedance

% of Action Level Exceedance

Limit Level Exceedance

% of Limit Level Exceedance

Air Quality

60

0

0

0

0

Noise

25

2

8

0

0

Water

78

0

0

0

0

Note: Exceedances that are considered not related to the construction activities are not included in this table.       

Table 4-7         Summary of Project-Related Exceedances

5                     WASTE MANAGEMENT

5.1.1          The status of waste management is summarized in Table 5-1 below.

Status of waste management

Quantity

Inert C&D Material Disposed of to Public Fill at Tuen Mun (m3)

1,753.3

Inert C&D Material Reused in other Contracts* (m3)

2,750.0

Metals Generated (kg)

Nil

Paper / Cardboard Packaging (kg)

300.0

Plastics (kg)

Nil

Chemical Waste (kg)

Nil

General Waste Disposed of to NENT Landfill (m3)

6.4

* Other Contracts include DC/2007/08 and HY/2008/09.

Table 5-1         Waste Generated in January 2010

6                     NON-COMPLIANCE AND DEFICIENCY

6.1               Site Audit by ET

6.1.1                 ET has carried out two site inspections in the reporting month.  All observations together with the appropriate recommended mitigation measures where necessary were recorded in the audit checklists that were passed to the Contractor.  Major environmental deficiencies observed during site inspection/audits and recommendation, which were made by the ET, are summarised in Table 6-1 below.  No non-compliance was observed.

Inspection Date

Observation

Recommendation

Status

8 January 2010

1. The breaker tips of the rock breakers were observed not wrapped with acoustic material properly at I-3 and Outfall.

2. Used chemical containers were observed at Outfall and the chemical containers in use without drip trays were observed at Outfall.

3. Poor wastewater mitigation measures (e.g. site runoff entering the river channel) were observed at I-2.

4. Site runoff was observed crossing the works areas and running into the channel at I-1.

1.  The Contractor was reminded to properly wrap the breaker tips of the rock breakers with acoustic materials.

2. The Contractor was reminded to remove used chemical containers from site and provide chemical containers with drip trays.

3.  The Contractor was reminded to implement proper wastewater mitigation measures on site.

4.  The Contractor was reminded to enhance wastewater mitigation measures on site.

1.   During site inspection on 29 January 2010, the breaker tips of the rock breakers were wrapped properly with acoustic materials (Closed).

2.   During site inspection on 29 January 2010, the used chemical containers were removed (Closed).

3.   During site inspection on 29 January 2010, proper wastewater mitigation measures were implemented on site (Closed).

4.   During site inspection on 29 January, wastewater mitigation measures were not enhanced on site.

29 January 2010

1. Chemical containers without drip trays were observed at I-3.

2. . Site runoff was observed crossing the works areas and running into the channel at I-1.

1. The Contractor was reminded to provide chemical containers with drip trays.

2. The Contractor was reminded to enhance wastewater mitigation measures on site.

1. During the site inspection on 4 February 2010, the Contractor was reminded to provide chemical containers with drip trays. (Outstanding).

2. During the site inspection on 4 February 2010, wastewater mitigation measures were enhanced on site (Closed).

Table 6-1         Site Inspection by ET

7                     COMPLAINT

7.1.1                A complaint hotline at 9850 3241 of the Contractor has been established for the Project.

7.1.2                Three environmental complaints were received during the reporting month.

7.1.3                EPD received a public complaint regarding effluent discharge at Intake-3 construction site on 19 January 2010. The effluent discharge on 19 January 2010 was due to the leakage of Gabion wall at I-3. The Contractor had sealed the gap at the Gabion wall immediately and the area would be checked and maintained continuously to avoid recurrence case. More mitigation measures were recommended to the Contractor: (1) Silt removal facilities should be checked and maintained regularly to ensure that they were functioned properly and no pipe leakage should be occurred. (2) More sandbags or other means should be used to place in order to segregate the watercourses and the working area. (3) No discharge of muddy water from any construction works into watercourses is allowed. Any on-site effluent discharge should be diverted to the silt removal facilities for treatment or settling and ensure that the water quality complied with the discharge license before discharging at the designed location. The complaint was considered justifiable because it was due to leakage of Gabion wall.  The above identified mitigation measures have been implemented by the Contractor on 22 January 2010 and ET will closely inspect the watercourses during the routine site inspection and provide advice to the Contractor. Details of the complaint investigation can be referred to Appendix K.

7.1.4                EPD received two public complaints regarding daytime construction noise at Intake-3 construction site on 19 and 21 January 2010. The monitoring station concerned is NSR 6 (i.e. at Squatter facing the construction site). According to the regular noise monitoring in January 2010, all measured noise levels were below the Limit level at NSR 6. The additional noise measurement carried out on 26 January 2010 also complied with the limit level in accordance with the EIAO-TM. However, the documented complaints for noise were considered to trigger the action level exceedances and the Contractor was advised to provide sound insulation sheets covering the working area during breaking and rock drilling in order to block the line of sight to the NSR, and noise insulation materials were used to enclose the drilling rig tightly. The above identified mitigation measures have been discussed with the Contractor and the Contractor has submitted the remedial proposal.   The proposal was implemented by the Contractor on 25 January 2010.  The noise monitoring frequency would be maintained in twice per week until no further complaint is received.  The ET will closely inspect the area during the routine site inspection and provide advice to the Contractor. Details of the complaint investigation can be referred to Appendix K.

7.1.5                Cumulative statistics of environmental complaints are shown in Table 7-1.

Complaints Received in the Reporting Month

Cumulative Number of Complaints

3

17

Table 7-1         Cumulative Statistic of Environmental Complaint

 

 

8                     SUMMARY OF NOTIFICATION OF SUMMONS, SUCCESSFUL PROSECUTIONS AND CORRECTIVE ACTIONS

8.1.1                No summons and successful prosecution was received during the reporting month.

8.1.2                Cumulative statistics of Notification of Summons, Successful Prosecutions and Convictions are shown in Table 8-1.

 

Notification of Summons

Successful Prosecution

January 2010

Cumulative

January 2010

Cumulative

0

0

0

0

Table 8-1         Cumulative Statistics of Notification of Summons and Successful Prosecutions

9                     FUTURE KEY ISSUE

9.1.1          The forecast of construction works for the upcoming three months are:

·         Site cleaning and tidying at I-1, I-2, I-3 and Outfall;

·         Soil nailing at I-3;

·         Breaking up exiting boulder at I-1, I-2, I-3, and Outfall;

·         Formation of access road at I-3 and Outfall;

·         Erosion control mat and green wire mesh at Outfall;

·         Construction of skin wall at I-2;

·         Formation of steel platform and gantry crane at I-2;

·         Formation of shafts at I-2;

·         Formation of Noise Enclosure at I-2 and Outfall; and

·         Construction of launching chamber at Outfall.

 

Appendix A

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Site Map and Works Area

 

Appendix B

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Organization Chart

 

Appendix C

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Construction Programme

 

Appendix D

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Implementation Status of Environmental Mitigation Measures

 

Appendix E

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Status of License and Permit

 

Appendix F

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Calibration Certificates

 

Appendix G

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Monitoring Locations

 

Appendix H

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EM&A Schedule

 

Appendix I

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Monitoring Results

 

Appendix J

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Interim Notifications of Environmental Quality Limits Exceedances

 

 

Appendix K

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Complaint Log