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 Air Borne Noise

Table 3‑8      Event/Action Plan for Airborne 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      Air Borne 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      Summary of Exceedances for O-1(FT)

Table 4-7      Summary of Exceedances for O-1(ET)

Table 4-8      Water Quality Monitoring Results

Table 4-9      Summary of Project-Related Exceedances

Table 5-1      Waste Generated in March 2012

Table 6-1       Site Inspection by ET

Table 7-1       Cumulative Statistics of Environmental Complaints

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

 

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

l   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 March 2012.

l    According to the EM&A Manual, there are four designated air quality monitoring locations, five designated noise monitoring locations and five 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).

l    During the non restricted hours, major construction activities undertaken by the Contractor at Tsuen Wan Drainage Tunnel included site cleaning and tidying at Outfall, I-1, I-2 and I-3; mucking out of tunnel spoil at Outfall; removal of muck hopper at Outfall; construction of box culvert and L-shaped retaining wall at Outfall; reinstatement of rock armour including placing of rock armour on step blocks at Portion E; installation of precast sea wall blocks and panels at Portion E; construction of deaeration chamber at I-3; drilling hole and excavation for main adit tunnel at I-3; construction of man access shaft at I-3; construction of man access adit at I-3; construction of approach channel at I-3; construction of preventive measure for temporary drainage management plan (TDMP) at I-3; lowering down the permanent access road at PB wall at I-3; construction of road drainage (U-channel and 900 mm diameter pipe) at proposed access road at I-3; blasting and excavation of man access adit, deaeration chamber and main adit tunnel at I-2; construction of L-shaped retaining wall at I-2; construction of bund wall at I-2; drainage works (1500 mm diameter pipe and associated works) at Portion G at I-2; and dismantling and removal of tunnel boring machine (TBM) services at Outfall and I-1.

l    Underground mining and probe drilling were undertaken during the restricted hours in the reporting period.

l    As confirmed by the Contractor, no marine mud dredging works for basin scheme at Portion E was conducted in the reporting month.

l   No exceedances have been recorded for air quality monitoring during the reporting month.

l   No exceedances have been recorded for noise monitoring during the reporting month.

l   Exceedances for river water quality monitoring are summarised  in the following table:

Parameter

Action Level Exceedance

Limit Level Exceedance

DO

Nil

Nil

Turbidity

Nil

Nil

SS

Two records at I-1 on 9 Mar 2012 and at I-2 on 12 Mar 2012

Two records at I-1 on 19 Mar 2012 and at I-2 on 5 Mar 2012

l   Exceedances for marine water quality monitoring are summarised  in the following table:

Parameter

Action Level Exceedance

Limit Level Exceedance

DO

Five records at O-1(ET) on 2, 5, 7 and 16 Mar 2012

Twenty-nine records at O-1(FT) on 2, 5, 9, 12, 14, 16, 23 and 30 Mar 2012 and at O-1(ET) on 2, 5, 9, 12, 14, 16, 23, 26 and 30 Mar 2012

Turbidity

Nil

Nil

SS

Two records at O-1(FT) on 2 and 5 March 2012

Two records at O-1(ET) on 2 and 14 March 2012

l   The status of waste generation in the reporting month is:

·         A total of 285.7 m3 C&D material was disposed of to public fill at Tuen Mun. No inert C&D material was reused in this Contract and about 1,207.5 m3 inert C&D material was reused in other Contracts. Detail information could be referred to Section 5.1.1 of this report.

·         About 43.3 m3 general waste was disposed of to NENT Landfill;

·         No paper/cardboard was recycled in the reporting month;

·         About 229,030.0 kg metal was generated in the reporting month;

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

·         About 411.0 kg chemical waste was disposed of in the reporting month.

l   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 site inspection checklists, were passed to the Contractor together with the ET’s recommendations.

l   As advised by the Contractor and verified by ET:

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

·         No environmental complaint was received during the reporting month; and

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

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

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

·           Dismantling and removal of TBM services at Outfall and I-1;

·           Construction and excavation of box culvert and L-shaped retaining wall at Outfall;

·           Construction and excavation of permanent access road at I-3;

·           Construction of approach channel at I-3;

·           Construction of road drainage works at I-3;

·           Excavation of main adit tunnel at I-3;

·           Construction of man access shaft at I-3;

·           Construction of man access adit at I-3;

·           Construction of deaeration chamber at I-3;

·           Blasting and excavation of man access adit, deaeration chamber and main adit tunnel at I-2;

·           Construction of deaeration chamber at I-2;

·           Construction of man access adit at I-2; and

·           Surface drainage works at Portion G at I-2.

 

1                     INTRODUCTION

1.1.1                 The Drainage Services Department (DSD) proposed to construct a tunnel with an internal diameter of 6.5 m and a length of 5.13 km, 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 designated 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 programme 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 forty-eighth monthly EM&A report summarising the impact monitoring results and audit findings of the EM&A programme in March 2012.

 

 

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:

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

l  Mucking out of tunnel spoil at Outfall;

l  Removal of muck hopper at Outfall;

l  Construction of box culvert and L-shaped retaining wall at Outfall;

l  Reinstatement of rock armour including placing of rock armour on step blocks at Portion E;

l  Installation of precast sea wall blocks and panels at Portion E;

l  Construction of deaeration chamber at I-3;

l  Drilling hole and excavation for main adit tunnel at I-3;

l  Construction of man access shaft at I-3;

l  Construction of man access adit at I-3;

l  Construction of approach channel at I-3;

l  Construction of preventive measure for temporary drainage management plan (TDMP) at I-3;

l  Lowering down the permanent access road at PB wall at I-3;

l  Construction of road drainage (U-channel and 900 mm diameter pipe) at proposed access road at I-3;

l  Blasting and excavation of man access adit, deaeration chamber and main adit tunnel at I-2;

l  Construction of L-shaped retaining wall at I-2;

l  Construction of bund wall at I-2;

l  Drainage works (1500 mm diameter pipe and associated works) at Portion G at I-2; and

l  Dismantling and removal of tunnel boring machine (TBM) services at Outfall and I-1.

2.2.3                As confirmed by the Contractor, no marine mud dredging works for basin scheme at Portion E was conducted in the reporting month.

2.2.4                Underground mining and probe drilling were undertaken during the restricted hours in the reporting period.

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                One-hour total suspended particulates (TSP) levels were measured at the designated air quality 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                One-hour TSP monitoring was 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 was 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 was kept in a clean and tightly sealed plastic bag. The filter paper was then re-conditioned in desiccators for 24 hours before obtaining the weight under laboratory conditions.

3.1.4                The average concentrations of the TSP were 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 were 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 was carried out by ALS Technichem (HK) Pty Limited (HOKLAS Registration Number 066).

Monitoring Equipment and Calibration

3.1.6                High Volume Air Samplers (HVASs) were 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 were 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 was used for the calculation of the TSP level.  Calibration Kit Model - TE5025A was used for calibration of the HVAS.  Recalibration of the HVAS was carried out after motor maintenance, at least once every six months, which was 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

1785

ASR 1

HVAS

BM2000HX

5875

1785

ASR 3

HVAS

TE5005X

1059

1785

ASR 8

HVAS

TE5005X

1713

1785

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 are 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-hour 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 was measured in terms of equivalent A-weighted sound pressure level (Leq) measured in decibels (dB(A)).  Monitoring of Leq(30 min) was 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, were also recorded during monitoring.  Major noise sources observed, both on-site and off-site, were recorded on the field data sheet.  All measurements were recorded and presented to the nearest 0.1 dB(A) 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, were used.  Noise levels for the A-weighted levels Leq(30 min), L10 and L90 were measured throughout the impact monitoring.  An average, by sound power, of six consecutive 5-minute readings was used to provide Leq(30 min) for non-restricted hours (0700-1900 hours from Monday to Saturday except public holidays).  A facade correction of 3 dB(A) was applied to the measurements that were 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 were 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 NL-31 and B&K Integrating Sound Level Meter of Type 2238 in compliance with the International Electrotechnical Commission Publication specifications (Paragraph 3.2.3) were 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 was checked using an acoustic calibrator generating a known sound pressure level at a known frequency.  Measurements were considered as valid only if the calibration levels from before and after the noise measurement agreed to within 1.0 dB(A).  Sound level meters and calibrators were calibrated annually to ensure they performed to the same level of accuracy as stated in the manufacturer’s specifications.  The noise monitoring equipment used during the reporting month are 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

NL-31

00410224

NSR1, NSR3, NSR6, NSR8 and NSR9

Sound Level Meter

B&K

2238

2448529

Sound Level Calibrator

Rion

NC-73

10486660

Sound Level Calibrator

B&K

4231

2699361

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 facade 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 July 2009)

Roof* (since 16 July 2009)

* The noise monitoring location of NSR9 had been adjusted to rooftop since 16 July 2009.

Table 3‑6         Noise Monitoring Locations

Action and Limit Levels

3.2.8                 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 hours on normal weekdays

When one documented complaint is received

75 dB(A)*

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

Table 3‑7         Action & Limit Levels for Air Borne 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 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.

·  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 and 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 Airborne 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 near the Project site, it is suggested that a programme of monitoring should be established to confirm the effectiveness of these mitigation measures in 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 were measured at all designated monitoring locations including control points at an interval of 3 days per week.  DO, temperature, turbidity, pH and SS measurements were undertaken at designated monitoring locations.

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

3.3.6                 Each sample was 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. 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 were transferred to clearly labelled and pre-cleaned sample containers with necessary preservatives immediately after collection.  The sample containers were provided by a HOKLAS accredited laboratory.  About 1 L of samples was collected for all laboratory analysis.  Following sampling, samples should be stored in a cool box at temperature between 0 and 4 oC, 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

DO / Temperature Meter

YSI

55/12

1

DO / Temperature/ pH Meter

YSI

Professional Plus

1

pH Meter

Hanna

HI-8014

1

Turbidimeter

EUTECH

TN-100

1

Table 3‑9          Water Quality Monitoring Equipment

3.3.8                 All in-situ monitoring equipment were checked and calibrated prior to use.  They were 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 were checked with certified standard solutions before each use.  Wet bulb calibrations for all DO meters were 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" was observed.  The calibration certificates are included in Appendix F.

Monitoring Location

3.3.9                 Five designated impact monitoring locations (three river stations and two marine stations) and five control locations (three river control stations and two marine control stations) were identified in the contract specific EM&A Manual for river and marine water quality monitoring.  These monitoring stations are listed in Table 3-10 below and shown in Appendix G. 

Monitoring Station ID

Name of Premises

River

 

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

Marine

 

O-1 (FT) and (ET)

Outfall O-1 during 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 were two control stations for Outfall O-1, one for sampling during flood tide and one for sampling during ebb tide.  Only one of these control stations for Outfall O-1 was sampled during each sampling.  Control station to be sampled was 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 would 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 and Bottom)

Surface and Middle

5%-ile of baseline data for surface

and middle layer.

 

 

Bottom

5%-ile of baseline data for bottom layer.

Surface and Middle

4 mg/L except 5 mg/L for Fish Culture Zone or

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

Bottom

2 mg/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 limit.

·         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 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 findings;

·  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 findings;

·  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 findings;

·  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;

·  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 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, 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 findings;

·  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 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;

·  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, 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 SOR, 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- hour TSP Monitoring

4.1.2                Results of 1-hour TSP level are shown in Table 4-1.  All measurements were recorded and presented to the nearest 0.1 mg/m3 in this report.  Detailed 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

06-Mar-12

33.1

307/500

73.5

67.3

12-Mar-12

67.3

101.6

62.4

16-Mar-12

41.6

46.5

55.1

22-Mar-12

74.7

66.1

66.1

28-Mar-12

35.5

194.7

74.7

ASR 3

06-Mar-12

49.7

327/500

74.5

64.6

12-Mar-12

50.9

62.1

87.0

16-Mar-12

60.9

43.5

57.1

22-Mar-12

99.4

99.4

83.2

28-Mar-12

33.5

219.9

123.0

ASR 8

06-Mar-12

52.2

337/500

72.3

83.0

12-Mar-12

83.0

66.9

57.6

16-Mar-12

56.2

42.8

61.6

22-Mar-12

28.1

75.0

26.8

28-Mar-12

77.6

84.3

159.3

ASR 9

06-Mar-12

52.4

329/500

79.3

67.2

12-Mar-12

69.9

84.6

61.8

16-Mar-12

41.6

87.3

59.1

22-Mar-12

98.1

126.3

77.9

28-Mar-12

180.0

102.1

56.4

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 air quality exceedance was recorded in the reporting month.

 

4.2               Noise

Air Borne Noise Monitoring

4.2.1                The air borne 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 and presented to the nearest 0.1 dB(A) in this report.  Detailed 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

06-Mar-12

64.1

70

12-Mar-12

64.1

22-Mar-12

63.2

28-Mar-12

63.9

NSR 3

06-Mar-12

63.8

75

12-Mar-12

62.1

22-Mar-12

62.3

28-Mar-12

58.2

NSR 6

06-Mar-12

68.6

12-Mar-12

68.5

22-Mar-12

62.7

28-Mar-12

63.3

NSR 8

06-Mar-12

64.9

12-Mar-12

70.9

22-Mar-12

70.0

28-Mar-12

70.9

NSR 9

06-Mar-12

64.7

12-Mar-12

65.9

22-Mar-12

62.6

28-Mar-12

70.3

Table 4-2         Air Borne Noise Monitoring Results

4.2.2                No project related noise exceedance was recorded in the reporting month.

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 4-7.

 

Parameter

Action Level Exceedance

Limit Level Exceedance

DO

Nil

Nil

Turbidity

Nil

Nil

SS

One record on 9 March 2012

One record on 19 March 2012

Total

1

1

Table 4-3         Summary of Exceedances for I-1

Parameter

Action Level Exceedance

Limit Level Exceedance

DO

Nil

Nil

Turbidity

Nil

Nil

SS

One record on 12 March 2012

One record on 5 March 2012

Total

1

1

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

0

0

Table 4-5         Summary of Exceedances for I-3

Parameter

Action Level Exceedance

Limit Level Exceedance

DO

Nil

Fourteen records on 2, 5, 9, 12, 14, 16, 23 and 30 Mar 2012

Turbidity

Nil

Nil

SS

Two records on 2 and 5 March 2012

Nil

Total

2

14

Table 4-6         Summary of Exceedances for O-1(FT)

Parameter

Action Level Exceedance

Limit Level Exceedance

DO

Five records on 2, 5, 7 and 16 Mar 2012

Fifteen records on 2, 5, 9, 12, 14, 16, 23, 26 and 30 Mar 2012

Turbidity

Nil

Nil

SS

Nil

Two records on 2 and 14 March 2012

Total

5

17

Table 4-7         Summary of Exceedances for O-1(ET)

4.3.2                 Results of measured water quality parameters during the reporting month are shown in Table 4-8.  Detailed results including weather conditions and graphical presentations are enclosed in Appendix I.

River Water Quality Monitoring

4.3.3                 Four exceedances were recorded for the river water quality monitoring within the reporting month.

Exceedances of Suspended Solids Level

Action Level at I-1 on 9 March 2012

4.3.4                 One exceedance of SS action level was recorded at I-1 on 9 March 2012. The measured SS level (5.50 mg/L) was below the baseline action/limit level, but higher than 120% of the SS level (4.40 mg/L) of the control station (I-1-C). Details of the construction activities conducted on the monitoring day are given in Appendix J. No direct disturbance was observed from the site. The exceedance was considered to be contributed by natural variation and non-project related. Therefore, no further action was required.

Action Level at I-2 on 12 March 2012

4.3.5                 One exceedance of SS action level was recorded at I-2 on 12 March 2012. The measured SS level (2.50 mg/L) was well below the baseline action/limit level, but higher than 120% of the SS level (<2.00 mg/L) of the control station (I-2-C). Details of the construction activities conducted on the monitoring day are given in Appendix J. No direct disturbance was observed from the site. The exceedance was considered to be contributed by natural variation and non-project related. Therefore, no further action was required.

Limit Level at I-1 on 19 March 2012

4.3.6                 One exceedance of SS limit level was recorded at I-1 on 19 March 2012. The measured SS level (3.45 mg/L) was well below the baseline action/limit level, but higher than 130% of the SS level (2.25 mg/L) of the control station (I-1-C). Details of the construction activities conducted on the monitoring day are given in Appendix J. No direct disturbance was observed from the site. Therefore, the exceedance was considered to be contributed by natural variation. Since the exceedance was non-project related, no further action was required.

Limit Level at I-2 on 5 March 2012

4.3.7                 One exceedance of SS limit level was recorded at I-2 on 5 March 2012. The measured SS level (2.80 mg/L) was well below the baseline action/limit level, but higher than 130% of the SS level (<2.00 mg/L) of the control station (I-2-C). Details of the construction activities conducted on the monitoring day are given in Appendix J. No direct disturbance was observed from the site. Therefore, the exceedance was considered to be contributed by natural variation. Since the exceedance was non-project related, no further action was required.

Marine Water Quality Monitoring

4.3.8                 Thirty-eight exceedances were recorded for the marine water quality monitoring within the reporting month.

Exceedances of Dissolved Oxygen Level

Action Level at O-1(ET) (Marine Mid-depth) on 7 and 16 March 2012

4.3.9                 Two exceedances of DO action levels were recorded at O-1(ET) (marine mid-depth) on 7 and 16 March 2012. For 7 March 2012, the measured DO level (7.01 mg/L) at the monitoring station was below the baseline action level and lower than the DO level (7.08 mg/L) of the corresponding control station (about 1.0%). For 16 March 2012, the measured DO level (6.98 mg/L) at the monitoring station was below the baseline action level, but higher than the DO level (6.85 mg/L) of the corresponding control station.  Details of the construction activities conducted on the monitoring days are given in Appendix J. No direct disturbance was observed from the site. The exceedances were considered to be contributed by natural variation and non-project related. Therefore, no further action was required.

Action Level at O-1(ET) (Marine Bottom) on 2, 5 and 16 March 2012

4.3.10               Three exceedances of DO action levels were recorded at O-1(ET) (marine bottom) on 2, 5 and 16 March 2012. For 2 March 2012, the measured DO level (6.55 mg/L) at the monitoring station was below the baseline action level and lower than the DO level (6.56 mg/L) of the corresponding control station (about 0.2%). For 5 and 16 March 2012, the measured DO levels (6.63 and 6.67 mg/L, respectively) at the monitoring station were below the baseline action level, but higher than the DO levels of the corresponding control station (6.54 and 6.50 mg/L, respectively). Details of the construction activities conducted on the monitoring days are given in Appendix J. No direct disturbance was observed from the site. The exceedances were considered to be contributed by natural variation and non-project related. Therefore, no further action was required.

Limit Level at O-1(FT) (Marine Surface) on 5 March 2012

4.3.11               One exceedance of DO limit level was recorded at O-1(FT) (marine surface) on 5 March 2012. The measured DO level (6.70 mg/L) at the monitoring station was below the baseline limit level and lower than the DO level (6.84 mg/L) of the corresponding control station (about 2.0%). Details of the construction activities conducted on the monitoring day are given in Appendix J. No direct disturbance was observed from the site. The exceedance was considered to be contributed by natural variation and non-project related. Therefore, no further action was required.

Limit Level at O-1(FT) (Marine Mid-depth) on 2, 5, 9, 12 and 16 March 2012

4.3.12               Five exceedances of DO limit levels were recorded at O-1(FT) (marine mid-depth) on 2, 5, 9, 12 and 16 March 2012. For 2 March 2012, the measured DO level (6.70 mg/L) at the monitoring station was below the baseline limit level, but higher than the DO level (6.66 mg/L) of the corresponding control station. For 5, 9, 12 and 16 March 2012, the measured DO levels (6.61, 6.79, 6.55 and 6.46 mg/L, respectively) at the monitoring station were below the baseline limit level and lower than the DO levels (6.68, 6.84, 6.71 and 6.53 mg/L, respectively) of the corresponding control station (about 1.0%, 0.7%, 2.4% and 1.1%, respectively). Details of the construction activities conducted on the monitoring days are given in Appendix J. No direct disturbance was observed from the site. The exceedances were considered to be contributed by natural variation and non-project related. Therefore, no further action was required.

Limit Level at O-1(FT) (Marine Bottom) on 2, 5, 9, 12, 14, 16, 23 and 30 March 2012

4.3.13               Eight exceedances of DO limit levels were recorded at O-1(FT) (marine bottom) on 2, 5, 9, 12, 14, 16, 23 and 30 March 2012. For 2, 9 and 16 March 2012, the measured DO levels (6.59, 6.88 and 6.64 mg/L, respectively) at the monitoring station were below the baseline limit level and lower than the DO levels (6.61, 6.89 and 6.75 mg/L, respectively) of the corresponding control station (about 0.3%, 0.1% and 1.6%, respectively). For 5, 12, 23 and 30 March 2012, the measured DO levels (6.61, 6.78, 6.92 and 6.84 mg/L, respectively) at the monitoring station were below the baseline limit level, but higher than the DO levels (6.60, 6.67, 6.90 and 6.79 mg/L, respectively) of the corresponding control station. For 14 March 2012, the measured DO level (6.80 mg/L) at the monitoring station was below the baseline limit level and same as the DO level of the corresponding control station. Details of the construction activities conducted on the monitoring days are given in Appendix J. No direct disturbance was observed from the site. The exceedances were considered to be contributed by natural variation and non-project related. Therefore, no further action was required.

Limit Level at O-1(ET) (Marine Surface) on 2, 5, 9, 12, 14, 16, 23 and 26 March 2012

4.3.14               Eight exceedances of DO limit levels were recorded at O-1(ET) (marine surface) on 2, 5, 9, 12, 14, 16, 23 and 26 March 2012. For 2, 5, 9, 12, 14, 16 and 26 March 2012, the measured DO levels (6.75, 6.91, 6.81, 6.84, 6.93, 6.80 and 6.91 mg/L, respectively) at the monitoring station were below the baseline limit level and lower than the DO level (6.80, 7.04, 6.89, 6.89, 6.97, 6.91 and 7.12 mg/L, respectively) of the corresponding control station (about 0.7%, 1.8%, 1.2%, 0.7%, 0.6%, 1.6% and 2.9%, respectively). For 23 March 2012, the measured DO level (6.92 mg/L) at the monitoring station was below the baseline limit level, but higher than the DO level (6.91 mg/L) of the corresponding control station. Details of the construction activities conducted on the monitoring days are given in Appendix J. No direct disturbance was observed from the site. The exceedances were considered to be contributed by natural variation and non-project related. Therefore, no further action was required.

Limit Level at O-1(ET) (Marine Mid-depth) on 2, 5, 9, 12, 14, 23 and 30 March 2012

4.3.15               Seven exceedances of DO limit levels were recorded at O-1(ET) (marine mid-depth) on 2, 5, 9, 12, 14, 23 and 30 March 2012. The measured DO levels (6.64, 6.59, 6.82, 6.73, 6.74, 6.88 and 6.91 mg/L, respectively) at the monitoring station were below the baseline limit level and lower than the DO levels (6.71, 6.71, 6.86, 6.75, 6.83, 6.95 and 6.94 mg/L, respectively) of the corresponding control station (about 1.0%, 1.8%, 0.6%, 0.3%, 1.3%, 1.0% and 0.4%, respectively). Details of the construction activities conducted on the monitoring days are given in Appendix J. No direct disturbance was observed from the site. The exceedances were considered to be contributed by natural variation and non-project related. Therefore, no further action was required.

Exceedances of Suspended Solids Level

Action Level at O-1(FT) on 2 and 5 March 2012

4.3.16               Two exceedances of SS action level were recorded at O-1(FT) on 2 and 5 March 2012. The measured SS levels (2.78 and 4.32 mg/L, respectively) at the monitoring station were well below the baseline action/limit level, but higher than 120% of the SS levels (2.17 and 3.50 mg/L, respectively) of the corresponding control station. Details of the construction activities conducted on the monitoring days are given in Appendix J. No direct disturbance was observed from the site. The exceedances were considered to be contributed by natural variation and non-project related. Therefore, no further action was required.

Limit Level at O-1(ET) on 2 and 14 March 2012

4.3.17               Two exceedances of SS limit level were recorded at O-1(FT) on 2 and 14 March 2012. The measured SS levels (3.86 and 4.28 mg/L, respectively) at the monitoring station were well below the baseline action/limit level, but higher than 130% of the SS levels (2.83 and 2.98 mg/L, respectively) of the corresponding control station. Details of the construction activities conducted on the monitoring days are given in Appendix J. No direct disturbance was observed from the site. The exceedances were considered to be contributed by natural variation and non-project related. Therefore, no further action was required.

Station

Date

Temperature (oC)

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-Mar-12

24.10

7.64

3.42 / 3.34

7.72

3.68

9.75 / 12.47

2.05

8.85 / 10.17

 

05-Mar-12

22.40

8.02

 

7.70

3.43

 

2.30

 

 

07-Mar-12

22.00

8.09

 

7.70

4.58

 

<2.00

 

 

09-Mar-12

18.80

8.33

 

7.82

4.94

 

5.50

 

 

12-Mar-12

15.90

9.04

 

7.81

6.00

 

2.50

 

 

14-Mar-12

18.60

8.74

 

7.94

4.38

 

2.05

 

 

16-Mar-12

21.00

7.06

 

7.67

4.67

 

<2.00

 

 

19-Mar-12

22.60

8.06

 

7.60

8.14

 

3.45

 

 

21-Mar-12

20.00

8.66

 

7.86

6.91

 

<2.00

 

 

23-Mar-12

21.00

7.96

 

7.66

3.23

 

<2.00

 

 

26-Mar-12

22.60

8.13

 

8.07

3.83

 

<2.00

 

 

28-Mar-12

22.70

7.98

 

7.91

5.57

 

3.05

 

 

30-Mar-12

23.30

7.56

 

7.89

3.45

 

<2.00

 

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

                         Bold indicates the occurrence of exceedance of Limit level.

Station

Date

Temperature (oC)

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-Mar-12

24.10

7.71

- / -

7.72

3.71

- / -

<2.00

- / -

 

05-Mar-12

22.40

7.95

 

7.70

3.50

 

2.60

 

 

07-Mar-12

22.00

8.02

 

7.69

4.63

 

<2.00

 

 

09-Mar-12

18.70

8.29

 

7.82

4.97

 

4.40

 

 

12-Mar-12

15.80

8.97

 

7.81

5.86

 

3.40

 

 

14-Mar-12

18.60

8.74

 

7.94

4.30

 

2.05

 

 

16-Mar-12

20.95

7.09

 

7.67

4.78

 

<2.00

 

 

19-Mar-12

22.70

8.11

 

7.60

8.10

 

2.25

 

 

21-Mar-12

20.00

8.60

 

7.86

7.01

 

2.15

 

 

23-Mar-12

21.00

7.92

 

7.66

3.35

 

<2.00

 

 

26-Mar-12

22.60

8.35

 

8.07

3.91

 

<2.00

 

 

28-Mar-12

22.70

7.92

 

7.90

5.70

 

2.95

 

 

30-Mar-12

23.30

7.50

 

7.89

3.38

 

<2.00

 

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

                         Bold indicates the occurrence of exceedance of Limit level.

Station

Date

Temperature (oC)

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-Mar-12

24.75

7.55

3.66 / 3.63

7.54

1.60

6.63 / 6.99

<2.00

7.68 / 8.34

 

05-Mar-12

22.70

8.08

 

7.70

1.60

 

2.80

 

 

07-Mar-12

22.00

8.05

 

7.66

1.97

 

<2.00

 

 

09-Mar-12

19.10

8.05

 

7.72

1.79

 

<2.00

 

 

12-Mar-12

15.70

9.05

 

7.75

4.19

 

2.50

 

 

14-Mar-12

18.60

8.75

 

7.85

1.83

 

<2.00

 

 

16-Mar-12

21.60

7.19

 

7.60

1.77

 

<2.00

 

 

19-Mar-12

22.50

7.95

 

7.62

1.73

 

<2.00

 

 

21-Mar-12

20.65

8.46

 

7.74

4.02

 

2.20

 

 

23-Mar-12

21.30

8.07

 

7.62

2.21

 

<2.00

 

 

26-Mar-12

22.30

8.24

 

8.03

1.86

 

<2.00

 

 

28-Mar-12

22.50

7.81

 

7.95

1.60

 

2.90

 

 

30-Mar-12

23.70

7.49

 

7.75

1.67

 

<2.00

 

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

                         Bold indicates the occurrence of exceedance of Limit level.

Station

Date

Temperature (oC)

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-Mar-12

24.70

7.50

- / -

7.54

1.58

- / -

<2.00

- / -

 

05-Mar-12

22.60

8.02

 

7.71

1.67

 

<2.00

 

 

07-Mar-12

22.10

7.95

 

7.66

1.96

 

<2.00

 

 

09-Mar-12

19.00

7.97

 

7.72

1.81

 

<2.00

 

 

12-Mar-12

15.70

8.86

 

7.75

4.19

 

<2.00

 

 

14-Mar-12

18.60

8.68

 

7.85

1.86

 

<2.00

 

 

16-Mar-12

21.50

7.04

 

7.61

1.84

 

<2.00

 

 

19-Mar-12

22.50

8.08

 

7.63

1.81

 

<2.00

 

 

21-Mar-12

20.70

8.44

 

7.74

5.24

 

2.80

 

 

23-Mar-12

21.20

8.04

 

7.60

2.27

 

<2.00

 

 

26-Mar-12

22.30

8.20

 

8.03

1.93

 

<2.00

 

 

28-Mar-12

22.50

7.86

 

7.95

1.61

 

3.65

 

 

30-Mar-12

23.70

7.46

 

7.74

1.68

 

<2.00

 

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

                         Bold indicates the occurrence of exceedance of Limit level.

Station

Date

Temperature (oC)

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-Mar-12

25.00

7.52

3.65 / 3.51

7.50

1.53

3.99 / 4.18

<2.00

6.13 / 7.23

 

05-Mar-12

22.25

7.96

 

7.69

1.13

 

<2.00

 

 

07-Mar-12

21.85

7.91

 

7.63

0.84

 

<2.00

 

 

09-Mar-12

19.30

8.24

 

7.70

0.90

 

<2.00