TABLE OF CONTENTS

1       Introduction.. 1

1.1       Background. 1

1.2       Project Description. 1

1.3       Purpose of the Manual 3

1.4       Project Organisation. 4

1.5       Structure of the EM&A Manual 5

2       Air Quality Impact.. 7

2.1       Introduction. 7

2.2       Air Quality Parameters. 7

2.3       Monitoring Equipment 8

2.4       Laboratory Measurement / Analysis. 9

2.5       Monitoring Locations. 9

2.6       Baseline Monitoring. 11

2.7       Impact Monitoring. 11

2.8       Event and Action Plan. 12

2.9       Mitigation Measures. 15

3       Noise Impact.. 17

3.1       Introduction. 17

3.2       General Monitoring Requirement and Equipment 17

3.3       Noise Parameters for Construction Noise. 17

3.4       Noise Monitoring Stations for Construction Noise. 18

3.5       Baseline Monitoring for Construction Noise. 18

3.6       Impact Monitoring for Construction Noise. 18

3.7       Event and Action Plan. 19

3.8       Construction Noise Mitigation Measures. 22

3.9       Parameters for Operational Traffic Noise. 22

3.10     Monitoring Locations for Operational Traffic Noise. 23

3.11     Baseline Monitoring. 23

3.12     Operational Traffic Noise Impact Monitoring. 23

3.13     Event and Action Plan for Traffic Noise. 24

3.14     Noise Mitigation Measures for Traffic Noise. 24

4       Water Quality Impact.. 26

4.1       Introduction. 26

4.2       Water Quality Parameters. 26

4.3       Monitoring Locations. 26

4.4       Baseline Monitoring. 27

4.5       Impact Monitoring. 27

4.6       Site Audits. 28

4.7       Field Log. 28

4.8       Monitoring Equipment and Procedures. 28

4.9       Laboratory Measurement / Analysis. 29

4.10     Event and Action Plan. 30

5       Waste Management Implication.. 33

5.1       Introduction. 33

5.2       Mitigation Measures. 33

5.3       Audit Requirement 33

6       Land Contamination.. 34

6.1       Introduction. 34

7       Ecological Impact (Terrestrial) 35

7.1       Introduction. 35

7.2       Mitigation Measures. 35

7.3       Monitoring and Audit Requirement 37

8       Landscape and Visual Impacts.. 38

8.1       Introduction. 38

8.2       Mitigation Measures. 38

8.3       Audit Requirement 40

9       Landfill Gas Hazard.. 42

9.1       Introduction. 42

9.2       Monitoring during Construction and Operational Phases. 42

9.3       Limit Levels and Event and Action Plan (EAP) for Landfill Gas. 43

10     environmental Auditing.. 44

10.1     Site Inspection. 44

10.2     Compliance with Legal and Contractual Requirements. 44

10.3     Environmental Complaints. 45

11     Reporting.. 46

11.1     Introduction. 46

11.2     Baseline Monitoring Report 46

11.3     Monthly EM&A Reports. 46

11.4     Final EM&A Review Report – Construction Phase. 50

11.5     Data Keeping. 52

11.6     Interim Notification of Environmental Quality Limit Exceedances. 52

 

List of tables

 

Table 2.1            Proposed Air Quality Monitoring Stations. 9

Table 2.2            Summary of Construction Dust Monitoring Programme. 11

Table 2.3            Action and Limit Levels for Air Quality (Dust) 12

Table 2.4            Event and Action Plan for Air Quality (Dust) 13

Table 3.1            Proposed Construction Noise Monitoring Locations. 18

Table 3.2            Action and Limit Levels for Construction Noise. 19

Table 3.3            Event / Action Plan for Construction Noise. 20

Table 3.4            Examples of “Quiet” PME and Alternative Plants. 22

Table 3.5            Traffic Noise Monitoring Locations. 23

Table 4.1            Proposed Water Quality Monitoring Stations. 26

Table 4.2            Analytical Methods to be Applied to Water Quality Samples. 29

Table 4.3            Action and Limit Levels for Water Quality. 30

Table 4.4            Event and Action Plan for Water Quality. 31

Table 8.1            Construction Phase Mitigation Measures. 38

Table 8.2            Operational Phase Mitigation Measures. 39

Table 8.3            Event and Action Plan for Landscape and Visual 41

Table 9.1            Measurement Ranges for Landfill Gas. 42

Table 9.2            Limit Levels and Action Plan for Landfill Gas. 43

 

List of Figures

Figure 1.1              Site Location Plan

Figure 1.2              Project Organization

Figure 2.1              Locations of Air Quality Monitoring Station (NCWBR RIW)

Figure 2.2              Locations of Air Quality Monitoring Station (LTR RIW)

Figure 3.1              Location of Noise Monitoring Station (Construction Phase)

Figure 3.2              Location of Noise Monitoring Station (Operational Phase)

Figure 3.3              Locations of Proposed Noise Mitigation Measures (Lin Tak Road and Sau Mau Ping Road)

Figure 3.4              Locations of Proposed Noise Mitigation Measures (Clear Water Bay Road and On Sau Road)

Figure 3.5              Locations of Proposed Noise Mitigation Measures (New Clear Water Bay Road)

Figure 4.1              Locations of Water Quality Monitoring Station

Figure 8.1              Landscape Resources Plan (Sheet 1 of 2)

Figure 8.2              Landscape Resources Plan (Sheet 2 of 2)

 

list of Appendices

Appendix A           Construction Programme

Appendix B           Sample Data Record Sheet

Appendix C           Implementation Schedule and Recommended Mitigation Measures

Appendix D           Sample of the Interim Notification


1              Introduction

1.1          Background

1.1.1       The engineering feasibility study of the Anderson Road Quarry Development has been conducted under the Agreement No. CE18/2012 (CE) “Development of Anderson Road Quarry - Investigation” (the FS) to ascertain the feasibility of implementing the development proposal. The FS was classified as a designated project under the Schedule 3 of the Environmental Impact Assessment Ordinance (EIAO). Hence, as a part of the study, an environmental impact assessment (EIA) report titled "Development of Anderson Road Quarry" has been submitted and approved under the EIAO (Register: AEIAR-183/2014) on 28 July  2014.   Road improvement schemes for existing roads outside the Anderson Road Quarry Development were proposed in the FS to improve the future traffic condition and to cater for the additional traffic demand at the ARQ Development.  In this connection, there were three associated off-site road improvement works identified as the Schedule 2 designated projects under Item A.1 Part I of the Schedule 2 of the EIAO. 

1.1.2       The approved Schedule 3 EIA Report of the FS had already reviewed the potential environmental impacts of the proposed three road improvement works and concluded that no insurmountable environmental impacts are expected from the road improvement works  Nevertheless, detailed environmental implications of the proposed road improvement works will be further investigated in a separate EIA under the EIAO.

1.1.3       Subsequently, in accordance with the requirements of Section 5(1) of the EIAO, a project profile (No. PP-500/2014) for the “Development of Anderson Road Quarry Site – Road Improvement Works” (the Project) was submitted to the Director of Environmental Protection (the “DEP”) for application for an EIA Study Brief on 27 January 2014. Pursuant to Section 5(7)(a) of the EIAO, the DEP has issued a Study Brief (No.: ESB-268/2014) dated 10 March 2014 for the EIA study.

1.1.4       The purpose of the EIA study is to provide information on the nature and extent of environmental impacts arising from the construction and operation of the Project and associated works that will take place concurrently. This information will contribute to decisions by the Director on:

Ÿ    The overall acceptability of any adverse environmental consequences that are likely to arise as a result of the Project;

Ÿ    The conditions and requirements for the detailed design, construction and operation of the Project to mitigate against adverse environmental consequences wherever practicable; and

Ÿ    The acceptability of residual impacts after the proposed mitigation measures are implemented.

1.1.5       This Project comprises three road improvement works: (i) improvement of Sau Mau Ping Road and Lin Tak Road (ii) widening and improvement of sections of Clear Water Bay Road and On Sau Road; and (iii) widening and improvement of sections of New Clear Water Bay Road and Shun Lee Tsuen Road. The extents of the road improvement works are shown in Figure 1.1.

1.2          Project Description

1.2.1       The following is a summary of the proposed improvement schemes:

Junction of (J/O) Sau Mau Ping Road and Lin Tak Road

a.             Additional Lay-bys at Lin Tak Road

1.2.2       Details of the proposed works are as follows:

Ÿ    Lengthening of existing lay-bys from 12m and 18m to 70m and addition of 2 new lay-bys of 26m long at Lin Tak Road;

Ÿ    Realignment of Lin Tak Road towards south so as to allow space for the provision of lay-bys as mentioned above  which is very close to the lot boundary of Hong Wah Court and Hing Tin Estate.

Ÿ    Enlargement of existing roundabout at the J/O Lin Tak Road and Pik Wan Road to allow for smooth turning of long vehicle, but still maintaining the existing one entry lane and one circulating lane configuration.

Ÿ    Cutting of slopeworks at the south side of Lin Tak Road to allow space for the provision of lay-bys and road re-alignment.

 

b.             Westbound flyover from Lin Tak Road to Sau Mau Ping Road

1.2.3       Details of the proposed works are as follows:

Ÿ    Widening of small section of slip road towards Tseung Kwan O Road eastbound with associated slope works for retaining walls.

Ÿ    Construction of a new westbound flyover from Sau Mau Ping Road to Lin Tak Road leading to a free flow condition for turning movement from Sau Mau Ping Road eastbound and Lin Tak Road westbound to Tseung Kwan O Road slip road, as well as straight movement of Lin Tak Road eastbound and westbound.

·               Tseung Kwan O Road slip road to Sau Mau Ping Road will be shifted southwards with associated slope works to cater for the proposed flyover.

1.2.4       The  key  element  of  this  proposed  work  is  to  construct  a  new  vehicular flyover connecting Lin Tak Road and Sau Mau Ping Road and across Tseung Kwan O Road.

J/O Clear Water Bay Road and On Sau Road and J/O Clear Water Bay Road and New Clear Water Bay Road

1.2.5       The scope of the proposed works includes improvement works on Clear Water Bay Road and detouring right-turn movement from On Sau Road northbound onto Clear Water Bay Road eastbound by construction of a new U-turn facility with minimization of cutting of existing trees on slopes.

1.2.6       The key element of the proposed works is to construct a new U-turn facility on the westbound carriageway of Clear Water Bay Road.

J/O New Clear Water Bay Road and Shun Lee Tsuen Road

1.2.7       The scope of the proposed works is to widen a section of 130m long of the existing New  Clear Water Bay Road westbound carriageway opposite to Shun Lee Estate from one lane to two lanes, and to construct a new Shun Lee Tsuen Road slip road (about 350m) and a merging lane (about 170m) extending from the existing Shun Lee Tsuen Road and merging to the westbound carriage way of the New Clear Water Bay Road and with associated slope works for retaining walls.

1.2.8       As revealed by the traffic review, the existing single 2 lanes road configuration of Lin Tak Road is capable of handling the prevailing as well as the future traffic flow upon completion of the Anderson Road Quarry Site Development. Therefore, it is considered unnecessary to widen Lin Tak Road and so the single 2 lanes road capacity of Lin Tak Road will remain unchanged. Instead, the works originally proposed for Lin Tak Road will be scaled down to the construction of 4 numbers of lay-bys and associated road re-alignment to allow for roadside loading and unloading activities. No additional traffic will be induced due to the change.

1.2.9       It is anticipated that for works at J/O Clear Water Bay Road and On Sau Road and J/O Clear Water Bay Road and New Clear Water Bay Road, as well as New Clear Water Bay Road and Shun Lee Tsuen Road, construction works would be commenced by end 2016. The construction period is 3.5 years, and the tentative completion year is 2020. Besides, the construction works at Sau Mau Ping Road and Lin Tak Road would be started in end 2016 with the estimated construction period of 5 years, and the tentative completion year is 2022. Details of the tentative construction programme are shown in Appendix A. Nonetheless, it should be noted that the aforementioned programme, including the commencement and completion dates, is tentative and subject to review.

1.3          Purpose of the Manual

1.3.1       The purpose of this Environmental Monitoring and Audit (EM&A) Manual is to guide the set-up of an EM&A programme to check on compliance with the Environmental Impact Assessment (EIA) study recommendations of the Project, to assess the effectiveness of the recommend mitigation measures, to specify the environmental monitoring requirements including monitoring points, frequency and establishment of Event and Action Plan and to identify any further need for additional mitigation measures or remedial actions.

1.3.2       This EM&A Manual aims to provide systematic procedures for monitoring, auditing and minimizing environmental impacts associated with the activities of the Project. It outlines the monitoring and audit programme for the Project.

1.3.3       Hong Kong environmental regulations have served as environmental standards and guidelines in the preparation of this Manual. In addition, the EM&A Manual has been prepared in accordance with the requirement stipulated in Annex 21 of the Technical memorandum on Environmental Impact Assessment Process (EIAO-TM).

1.3.4       This Manual contains the following information:

·               Responsibilities of the Contractor, the Engineer or Engineer’s Representative (ER), the Environmental Team (ET), and the Independent Environmental Checker (IEC) with respect to the environmental monitoring and audit requirements during the course of the Project;

·               Project organisation for the Project;

·               Requirements with respect to the construction programme schedule and the necessary environmental monitoring and audit programme to track the varying environmental impact;

·               Details of the methodologies to be adopted, including all field laboratories and analytical procedures, and details on quality assurance and quality control programme;

·               The rationale on which the environmental monitoring data will be evaluated and interpreted;

·               Definition of Action and Limit levels;

·               Establishment of Event and Action Plans;

·               Requirements for reviewing pollution sources and working procedures required in the event of non-compliance with the environmental criteria and complaints;

·               Requirements for presentation of environmental monitoring and audit data and appropriate reporting procedures; and

·               Requirements for reviewing the EIA predictions and the effectiveness of the mitigation measures / environmental management systems and the EM&A programme.

1.3.5       This EM&A Manual is a dynamic document that should be reviewed regularly and updated as necessary during the construction and operation of the Project.

1.4          Project Organisation

1.4.1       The roles and responsibilities of the various parties involved in the EM&A process and the organisational structure of the organisations responsible for implementing the EM&A programme are outlined below. The proposed project organisation and lines of communication with respect to environmental protection works are shown in Figure 1.2.

Environmental Team (ET)

1.4.2       The Environmental Team should be led and managed by the ET leader. The ET leader shall be independent party from the Contractor and has relevant professional qualifications, or have sufficient relevant EM&A experience subject to approval of the ER and EPD. The ET Leader shall have at least 7 years of experience in conducting EM&A for infrastructure projects. His / Her qualification shall be vetted by the ER. The ET should monitor the mitigation measures implemented by the Contractor on regular basis to ensure the compliance with the intended aims of the measures. The duties and responsibilities of the ET are:

Ÿ   Set up all the required environmental monitoring stations;

Ÿ   Monitor various environmental parameters as required in the EM&A Manual;

Ÿ   Analyse the EM&A data and review the success of EM&A programme to cost-effectively confirm the adequacy of mitigation measures implemented and the validity of the EIA predictions and to identify any adverse environmental impacts arising;

Ÿ   Carry out site inspection and investigate and audit the Contractors’ site practice, equipment and work methodologies with respect to pollution control and environmental mitigation, and take proactive actions to pre-empt problems;

Ÿ   Liaison with IEC on all environmental performance matters, and timely submission of all relevant EM&A proforma for IEC’s approval;

Ÿ   Prepare reports on the environmental monitoring data and site environmental conditions;

Ÿ   Report on the EM&A results to the IEC. Contractor, the ER and EPD or tis delegated representative;

Ÿ   Recommend suitable mitigation measures to the Contractor in the case of exceedance of Action and Limit levels in accordance with the Event and Action Plans;

Ÿ   Give advice to the Contractor on environmental improvement, awareness, enhancement matters, etc. on site;

Ÿ   Undertake regular and ad-hoc on-site audits / inspections and report to the Contractor and the ER of any potential non-compliance;

Ÿ   Follow up and close out non-compliance actions, and

Ÿ   Adhere to the procedures for carrying out environmental complaint investigation.

 

Engineer or Engineer’s Representative (ER)

1.4.3       The Engineer is responsible for overseeing the construction works and for ensuring that the works are undertaken by the Contractor in accordance with the specification and contractual requirements. The duties and responsibilities of the Engineer with respect to EM&A include:

·               Supervise the Contractor’s activities and ensure that the requirements in the EM&A Manual are fully complied with;

·               Inform and instruct the Contractor when action is required to reduce environmental impacts in accordance with the Event and Action Plans;

·               Participate in joint site inspections and audits undertaken by the ET; and

·               Investigate complaints according to the agreed procedures and instruct the Contractor to follow up.

The Contractor

1.4.4       The Contractor should report to the ER. The duties and responsibilities of the Contractor are:

·               Implement the EIA recommendations and requirements;

·               Engage the ET to carry out EM&A works and notify the ET construction activities that may have environmental concern;

·               Submit proposals on mitigation measures in case of exceedances of Action and Limit levels, in accordance with the Event and Action Plans;

·               Implement measures to reduce environmental impacts where Action and Limit levels are exceeded until the events are resolved; and

·               Investigate complaints according to the agreed procedures.

Independent Environmental Checker (IEC)

1.4.5       The IEC should advise the ER on environmental issues related to the Project. The IEC should possess at least 7 years of experience in EM&A. The duties and responsibilities of the IEC are:

·               Review and audit in an independent, objective and professional manner in all aspects of the EM&A programme;

·               Validate and confirm the accuracy of monitoring results, monitoring equipment, monitoring locations, monitoring procedures and locations of sensitive receivers;

·               Audit the EIA recommendations and requirements against the status of implementation of environmental protection measures on site;

·               Review the effectiveness of environmental mitigation measures and project environmental performance;

·               On as-needed basis, verify and certify the environmental acceptability of the Environmental Permit (EP) holder’s construction methodology, relevant design plans and submissions under the EP;

·               Carry out random sample check and audit on monitoring data and sampling procedures, etc.;

·               Conduct monthly and random site inspection;

·               Verify the investigation results of environmental complaint cases and the effectiveness of corrective measures;

·               Verify EM&A report that has been certified by the ET leader; and

·               Provide feedback on the audit results to the ET or the EP holder according to the Event and Action Plans in the EM&A Manual.

1.5          Structure of the EM&A Manual

1.5.1       Following the introductory section, the remainder of the Manual is set out as follows:

·               Section 2 – Sets out EM&A requirement for air quality;

·               Section 3 – Sets out EM&A requirement for noise;

·               Section 4 – Details auditing requirement for water quality;

·               Section 5 – Sets out EM&A requirement for waste management;

·               Section 6 – Details auditing requirement for land contamination;

·               Section 7 – Details auditing requirement for ecology (terrestrial);

·               Section 8 – Details auditing requirement for landscape and visual;

·               Section 9 – Details auditing requirement for landfill gas hazard;

·               Section 10 – Describes scope and frequency of environmental site audits and sets out the general requirements of the EM&A programme; and

·               Section 11 – Details the EM&A reporting requirements.

 


2              Air Quality Impact 

2.1          Introduction

2.1.1       In this section, the requirements, methodology, equipment, monitoring locations, criteria and protocols for the monitoring and audit of air quality impact during the construction phase of the Project are presented. As identified in the EIA report, the Project would not cause any adverse operation air quality impacts. Therefore, environmental monitoring and audit is not required during the operational phase.

2.1.2       The objectives of the air quality monitoring shall be:

·               to identify the extent of construction dust impact on sensitive receivers;

·               to determine the effectiveness of mitigation measures to control fugitive dust emission from activities during the construction phase;

·               to audit the compliance of the Contractor with regard to dust control, contract conditions and the relevant dust impact criteria;

·               to recommend further mitigation measures if found to be necessary; and

·               to comply with Action and Limit (A/L) Levels for air quality as defined in this Manual.

2.2          Air Quality Parameters

2.2.1       The major construction activities of the Project would likely be demolition of existing structures, slope works, construction of retaining walls, carriageway/pavement construction and foundation works for noise barriers which would generate insignificant amount of small size particulates, hence, no significant Respirable Suspended Particulates (RSP) or Fine Suspended Particulates (FSP) impacts would be anticipated.  Monitoring of 24-hour RSP and 24-hour FSP levels are not proposed.  Therefore, only 1-hour Total Suspended Particulates (TSP) is recommended to be monitored and audited at the proposed monitoring locations.

2.2.2       The criteria against which ambient air quality monitoring to be assessed are:

·               1-hour TSP limit of 500 µg m-3

2.2.3       This level is not to be exceeded at Air Sensitive Receivers (ASRs).

2.2.4       Monitoring and audit of the TSP levels at each RIW site shall be carried out by the ET to ensure that any deteriorating air quality could be readily detected and timely action shall be undertaken to rectify such situation.

2.2.5       1-hour TSP levels should be measured to indicate the impacts of construction dust on air quality.  The TSP levels should be measured by following the standard method as set out in High Volume Sampling Method for Total Suspended Particulates, Part 50 Chapter 1 Appendix B, Title 40 of the Code of Federal Regulations of the USEPA (hereinafter referred to as “HVS method”).  Upon approval of EPD and IEC, an alternative sampling method of using direct reading methods for which the monitoring result is comparable with the high volume sampling method can be used.

2.2.6       All relevant data including temperature, pressure, weather conditions, elapsed-time meter reading for the start and stop of the sampler, identification and weight of the filter paper, other local atmospheric factors affecting or affected by site conditions and work progress of the concerned site etc. shall be recorded in detail. A sample data record sheet is shown in Appendix B.

2.3          Monitoring Equipment

2.3.1       High volume sampler (HVS) in compliance with the following specifications shall be used for carrying out the 1-hour TSP monitoring:

·               0.6 - 1.7 m3 per minute (20 - 60 standard cubic feet per minute) adjustable flow range;

·               equipped with a timing / control device with ± 5 minutes accuracy for 24 hours operation;

·               installed with elapsed-time meter with ± 2 minutes accuracy for 24 hours operation;

·               capable of providing a minimum exposed area of 406 cm2 ;

·               flow control accuracy: ± 2.5% deviation over 24-hour sampling period;

·               equipped with a shelter to protect the filter and sampler;

·               incorporated with an electronic mass flow rate controller or other equivalent devices;

·               equipped with a flow recorder for continuous monitoring;

·               provided with a peaked roof inlet;

·               incorporated with a manometer;

·               able to hold and seal the filter paper to the sampler housing at horizontal position;

·               equip with easy changeable filter; and

·               capable of operating continuously for 24-hour period.

2.3.2       The ET shall be responsible for the provision of the monitoring equipment. He shall ensure that sufficient number of HVSs with appropriate calibration kit is available for carrying out the baseline, regular impacts monitoring and ad-hoc monitoring. The HVSs shall be equipped with an electronic mass flow controller and be calibrated against a traceable standard at regular intervals, in accordance with requirements stated in the manufacturers operating manual.  All the equipment, calibration kit, filter papers, etc., shall be clearly labelled. If direct reading dust meters are proposed to be used, the ET Leader should submit sufficient information to the IEC to prove that of the monitoring result of the instrument is comparable with the HVS and may be used for the 1-hour sampling.  The instrument should also be calibrated regularly.

2.3.3       Initial calibration of the dust monitoring equipment shall be conducted upon installation and prior to commissioning at bi-monthly intervals. The transfer standard shall be traceable to the internationally recognised primary standard and be calibrated annually. The calibration data shall be properly documented for future reference by the concerned parties such as the IEC. All the data shall be converted into standard temperature and pressure condition.

2.3.4       The flow-rate of the sampler before and after the sampling exercise with the filter in position shall be verified to be constant and be recorded on the data sheet as shown in Appendix B.

2.3.5       If the ET Leader proposes to use a direct reading dust meter to measure 1-hour TSP levels, he shall submit sufficient information to the IEC to prove that the instrument is capable of achieving a comparable result as that of the HVS before it may be used for the 1-hour sampling. The instrument shall also be calibrated regularly, and the 1-hour sampling shall be determined periodically by HVS to check the validity and accuracy of the results measured by direct reading method.

2.3.6       Wind data monitoring equipment shall also be provided and set up at conspicuous locations for logging wind speed and wind direction near to the dust monitoring locations. The equipment installation location shall be proposed by the ET and agreed with the ER of the respective RIW and the IEC. For installation and operation of wind data monitoring equipment, the following points shall be observed:

(i)         The wind sensors shall be installed on masts at an elevated level 10m above ground so that they are clear of obstructions or turbulence caused by the buildings;

(ii)         The wind data shall be captured by a data logger. The data recorded in the data logger shall be downloaded periodically for analysis at least once a month;

(iii)        The wind data monitoring equipment shall be re-calibrated at least once every six months;

(iv)        Wind direction should be divided into 16 sectors of 22.5 degrees each.

2.3.7       In exceptional situations, the ET may propose alternative methods to obtain representative wind data upon approval from the ER and agreement from the IEC.

2.4          Laboratory Measurement / Analysis

2.4.1       A clean laboratory with constant temperature and humidity control and equipped with necessary measuring and conditioning instruments to handle the dust samples collected, shall be available for sample analysis, and equipment calibration and maintenance. The laboratory shall be HOKLAS accredited or other internationally accredited laboratory.

2.4.2       If a site laboratory is set up or a non-HOKLAS accredited laboratory is hired for carrying out the laboratory analysis, the laboratory equipment shall be verified by the IEC and approved by the ER. Measurement performed by the laboratory shall be demonstrated to the satisfaction of the ER and the IEC.

2.4.3       The IEC shall conduct regular audit of the measurement performed by the laboratory so as to ensure the accuracy of measurement results. The ET shall provide the ER with one copy of the Title 40 of the Code of Federal Regulations, Chapter 1 (Part 50), Appendix B for his/her reference.

2.4.4       Filter paper of size 8"x10" shall be labelled before sampling. It shall be a clean filter paper with no pinholes, and shall be conditioned in a humidity-controlled chamber for over 24-hour and be pre-weighed before use for the sampling.

2.4.5       After sampling, the filter paper loaded with dust shall be kept in a clean and tightly sealed plastic bag. The filter paper shall then be returned to the laboratory for reconditioning in the humidity-controlled chamber followed by accurate weighing by an electronic balance with readout down to 0.1mg. The balance shall be regularly calibrated against a traceable standard.

2.4.6       All the collected samples shall be kept in a good condition for 6 months before disposal.

2.5          Monitoring Locations

2.5.1       The selected monitoring locations are the worst potentially affected air sensitive receivers located in the vicinity of construction sites of the Project. The proposed air quality monitoring locations are listed in Table 2.1below and shown in Figures 2.1 and 2.2.

Table 2.1               Proposed Air Quality Monitoring Stations

Monitoring Station ID

EIA ID

Location

NCWBR RIW

NCWBR_AMS-1

ASLF-1

Shun Lee Fire Station

NCWBR_AMS-2

ASLE-21

Shun Lee Estate Lee Hang House

NCWBR_AMS-3

ASLD-10

Shun Lee Disciplined Services Quarters (Block 6)

NCWBR_AMS-4

AFNS-3

Sienna Garden

NCWBR_AMS-5

ASCC-05

Shun Chi Court Shun Fung House

LTR RIW

LTR_AMS-1

ASECP-2

St Edward's Catholic Primary School

LTR_AMS-2

AEPD-01

Environmental Protection Department's Restored Landfill Site Office

LTR_AMS-3

APTE-14

Po Tat Estate Tat Kai House

2.5.2       The status and locations of the air quality sensitive receivers may change after issuing this Manual. In such case, the ET shall propose updated monitoring locations and seek approval from ER and IEC and agreement from EPD on the proposal.

2.5.3       When alternative monitoring locations are proposed, the following criteria, as far as practicable, shall be followed:

(i)         at the site boundary or such locations close to the major dust emission source;

(ii)         close to the air sensitive receivers as defined in the EIAO-TM;

(iii)        proper position/sitting and orientation of the monitoring equipment; and

(iv)        take into account the prevailing meteorological conditions.

2.5.4       The ET shall agree with the IEC on the position of the HVS for installation of the monitoring equipment. When positioning the samplers, the following points shall be noted:

(i)         a horizontal platform with appropriate support to secure the samplers against gusty wind shall be provided;

(ii)         two samplers shall be placed less than 2 metres apart;

(iii)        the distance between the sampler and an obstacle, such as buildings, must be at least twice the height that the obstacle protrudes above the sampler;

(iv)        a minimum of 2 metres of separation from walls, parapets and penthouses is required for rooftop samplers;

(v)        a minimum of 2 metres of separation from any supporting structure, measured horizontally is required;

(vi)        no furnace or incinerator flue is nearby;

(vii)       airflow around the sampler is unrestricted;

(viii)      the sampler is more than 20 metres from the dripline;

(ix)        any wire fence and gate, to protect the sampler, shall not cause any obstruction during monitoring;

(x)        permission must be obtained to set up the samplers and to obtain access to the monitoring stations; and

(xi)        a secured supply of electricity is needed to operate the samplers.

2.6          Baseline Monitoring

2.6.1       Before commencing the baseline monitoring, the ET shall inform the IEC of the baseline monitoring programme such that the IEC can conduct on-site audit to ensure accuracy of the baseline monitoring results.

2.6.2       TSP baseline monitoring should be carried out at all of the designated monitoring locations for at least 14 consecutive days prior to the commissioning of the construction works. 1-hour TSP sampling shall be done at least three times per day at each monitoring station when the highest dust impacts are expected.  During the baseline monitoring, there should not be any construction or dust generating activities in the vicinity of the monitoring stations. General meteorological conditions (wind speed, direction and precipitation) and notes regarding any significant adjacent dust producing sources should also be recorded throughout the baseline monitoring period.  A summary of baseline monitoring is presented in Table 2.2.

2.6.3       In case the baseline monitoring cannot be carried out at the designated monitoring locations during the baseline monitoring period, the ET Leader shall carry out the monitoring at alternative locations which can effectively represent the baseline conditions at the impact monitoring locations. The alternative baseline monitoring location shall be approved by the ER and agreed with IEC.

2.6.4       In exceptional cases, when insufficient baseline monitoring data or questionable results are obtained, the ET Leader shall liaise with the IEC and EPD to agree on an appropriate set of data to be used as a baseline reference and submit to ER for approval.

2.6.5       Ambient conditions may vary seasonally and shall be reviewed once every three months. When the ambient conditions have changed and a repeat of the baseline monitoring is required to be carried out for obtaining the updated baseline levels, the monitoring should be at times when the Contractor's activities are not generating dust, at least in the proximity of the monitoring stations. Should change in ambient conditions be determined, the baseline levels and, in turn, the air quality criteria, should be revised. The revised baseline levels and air quality criteria should be agreed with the IEC and EPD.

2.7          Impact Monitoring

2.7.1       The ET shall carry out impact monitoring during construction phase of the Project. For 1-hour TSP monitoring, the sampling frequency of at least three times in every six-days should be undertaken when the highest dust impact occurs. In case of non-compliance with the air criteria, more frequent monitoring, as specified in the Action Plan in the following section, should be conducted. This additional monitoring should be continued until the excessive dust emission or the deterioration in the air quality is rectified. The impact monitoring programme is summarised in Table 2.2.

2.7.2       The monthly schedule of the compliance and impact monitoring programme should be drawn up by the ET one month prior to the commencement of the scheduled construction period. Before commencing the impact monitoring, the ET shall inform the IEC of the impact monitoring programme such that the IEC can conduct on-site audit to ensure accuracy of the impact monitoring results.

Table 2.2               Summary of Construction Dust Monitoring Programme

Monitoring Period

Duration

Sampling Parameter

Frequency

Baseline Monitoring

Consecutive days of at least 2 weeks before commencement of major construction works

1-hour TSP

3 times per day

Impact Monitoring

Throughout the construction phase

1-hour TSP

3 times in every 6 days when documented and valid complaint was received

2.8          Event and Action Plan

2.8.1       The baseline monitoring results will form the basis for determining the air quality criteria for the impact monitoring. The ET shall compare the impact monitoring results with air quality criteria set up for 1-hour TSP. Table 2.3 shows the air quality criteria, namely Action and Limit levels to be used. Should non-compliance of the air quality criteria occur, action in accordance with the Action Plan in Table 2.4 shall be carried out.

Table 2.3               Action and Limit Levels for Air Quality (Dust)

Parameter

Action Level(1)

Limit Level

TSP (1 hour average)

BL <= 384 µgm-3, AL = (BL * 1.3 + LL)/2

BL > 384 µgm-3, AL = LL

500 µgm-3

Note:

(1)    BL = Baseline level, AL = Action level, LL = Limit level.

 


Table 2.4               Event and Action Plan for Air Quality (Dust)

Event

Action

ET

IEC

ER

Contractor

Action level being exceeded by one sampling

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

·         Inform Contractor, IEC and ER;

·         Repeat measurement to confirm finding;

·         Increase monitoring frequency to daily.

·         Check monitoring data submitted by ET;

·         Check Contractor’s working method; and

·         Review and advise the ET and ER on the effectiveness of the proposed remedial measures.

·         Notify Contractor.

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

·         Implement remedial measures; and

·         Amend working methods agreed with the ER as appropriate

Action level being exceeded by two or more consecutive sampling

·         Identify source;

·         Inform Contractor, IEC and ER;

·         Advise the Contractor and ER 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 Contractor, IEC and ER;

·         If exceedance stops, cease additional monitoring.

·         Check monitoring data submitted by ET;

·         Check Contractor’s working method;

·         Discuss with ET, ER and Contractor on possible remedial measures;

·         Advise the ET and ER 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.

·         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.

·         Identify source and investigate the causes of exceedance;

·         Submit proposals for remedial measures to the ER with a copy to ET and IEC within three working days of notification;

·         Implement the agreed proposals; and

·         Amend proposal as appropriate.

Limit level being exceeded by one sampling

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

·         Inform Contractor ,IEC, ER, and EPD;

·         Repeat measurement to confirm finding;

·         Increase monitoring frequency to daily;

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

·         Identify source(s) and investigate the causes of exceedance;

·         Take immediate action to avoid further exceedance;

·         Submit proposals for remedial measures to ER with a copy to ET and IEC within three working days of notification;

·         Implement the agreed proposals; and

·         Amend proposal if appropriate.

Limit level being exceeded by two or more consecutive sampling

·         Notify IEC, ER, 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 ER to discuss the remedial actions to be taken;

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

·         If exceedance stops, cease additional monitoring.

·         Check monitoring data submitted by the ET;

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

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

·         Supervise the implementation of remedial measures.

·         Confirm receipt of notification of exceedance in writing;

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

·         Supervise the implementation of remedial measures; and

·         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.

·         Identify source(s) and investigate the causes of exceedance;

·         Take immediate action to avoid further exceedance;

·         Submit proposals for remedial measures to the ER with a copy to the IEC and ET within three working days of notification;

·         Implement the agreed proposals;

·         Revise and resubmit proposals if problem still not under control; and

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


2.9          Mitigation Measures

2.9.1       Mitigation measures for dust control have been recommended in the EIA Report. The Contractor shall be responsible for the design and implementation of these measures.

2.9.2       Recommended mitigation measures to minimise the adverse impacts on air quality during construction phases are detailed in Section 2.9.3 below.

2.9.3       To ensure compliance with the guideline level and AQO at the ASRs, the Air Pollution Control (Construction Dust) Regulation should be implemented and good site practices should be incorporated in the contract clauses to minimize construction dust impact. A number of below dust suppression measures are proposed to be implemented.

Ÿ    Watering once per hour on active construction work areas, and the watering application intensity is estimated to be 0.0455 L/m2 (tentatively) so as to achieve a dust removal efficiency of 87.5%;

Ÿ    Any excavated or stockpile of dusty material should be covered entirely by impervious sheeting or sprayed with water to maintain the entire surface wet and then removed or backfilled or reinstated where practicable within 24 hours of the excavation or unloading;

Ÿ    Any dusty material remaining after a stockpile is removed should be wetted with water and cleared from the surface of roads;

Ÿ    A stockpile of dusty material should not extend beyond the pedestrian barriers, fencing or traffic cones;

Ÿ    The load of dusty materials on vehicles leaving a construction site should be covered entirely by impervious sheeting to ensure that the dusty materials do not leak from vehicle;

Ÿ    Where practicable, vehicles washing facilities including a high pressure water jet should be provided at every discernible or designated vehicle exit point. The area where vehicle washing takes place and the road section between the washing facilities and the exit point should be paved with concrete, bituminous materials or hardcores;

Ÿ    When there are open excavation and reinstatement works, hoarding of not less than 2.4m high should be provided as far as practicable along the site boundary with provision for public crossing. Good site practice shall also be adopted by the Contractor to ensure the conditions of the hoardings are properly maintained throughout the construction period;

Ÿ    The portion of any road leading only to construction site that is within 30m of a vehicle entrance or exit should be kept clear of dusty materials;

Ÿ    Surfaces where any pneumatic or power-driven drilling, cutting, polishing or other mechanical breaking operation takes place should be sprayed with water or a dust suppression chemical continuously;

Ÿ    Any area that involves demolition activities should be sprayed with water or a dust suppression chemical immediately prior to, during and immediately after the activities so as to maintain the entire surface wet;

Ÿ    Where a scaffolding is erected around the perimeter of a building under construction, effective dust screens, sheeting or netting should be provided to enclose the scaffolding from the ground floor level of the building, or a canopy should be provided from the first floor level up to the highest level of the scaffolding;

Ÿ    Any skip hoist for material transport should be totally enclosed by impervious sheeting;

Ÿ    Every stock of more than 20 bags of cement or dry pulverised fuel ash (PFA) should be covered entirely by impervious sheeting or placed in an area sheltered on the top and the three sides;

Ÿ    Cement or dry PFA delivered in bulk should be stored in a closed silo fitted with an audible high level alarm which is interlocked with the material filling line and no overfilling is allowed; and

Ÿ    Exposed earth should be properly treated by compaction, turfing, hydroseeding, vegetation planting or sealing with latex, vinyl, bitumen, shortcrete or other suitable surface stabiliser within six months after the last construction activity on the construction site or part of the construction site where the exposed earth lies.

 

 

 


3              Noise Impact

3.1          Introduction

3.1.1       In this section, the requirements, methodology, equipment, monitoring locations, criteria and protocols for the monitoring and audit of noise impacts during the construction and operation phase of the Project are presented.

3.1.2       Construction noise impact and traffic noise impact from this Project are predicted at the identified NSRs.  Noise mitigation measures would be required to reduce noise levels in order to meet the stipulated standards. A noise monitoring programme should be undertaken to confirm such mitigation measures would be implemented properly.

3.1.3       According to the EIA, road traffic noise levels should be monitored at representative NSRs, which are in the vicinity of the recommended direct mitigation measures, during the first year after road opening. The purpose of the monitoring is to ascertain that the recommended mitigation measures are effective in reducing the noise levels.

3.2          General Monitoring Requirement and Equipment

3.2.1       As referred to in the Technical Memorandum (TM) issued under the Noise Control Ordinance (NCO), sound level meters in compliance with the International Electrotechnical Commission Publications 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications shall be used for carrying out the noise monitoring.  Immediately prior to and following each noise measurement the accuracy of the sound level meter shall be checked using an acoustic calibrator generating a known sound pressure level at a known frequency.  Measurements may be accepted as valid only if the calibration level from before and after the noise measurement agrees to within 1.0dB. 

3.2.2       Noise measurements should be made in accordance with standard acoustical principles and practices in relation to weather conditions.

3.2.3       The ET Leader is responsible for the provision, installation, operation, maintenance and dismantling of the monitoring equipment.  He shall ensure that sufficient noise monitoring equipment and associated instrumentation are available for carrying out the baseline monitoring, regular impact monitoring and ad hoc monitoring.  All the equipment and associated instrumentation shall be clearly labelled.

3.2.4       The monitoring station shall normally be at a point 1m from the exterior of the sensitive receiver's building facade and be at a position 1.2m above the ground.  If there is problem with access to the normal monitoring position, an alternative position may be chosen, and a correction to the measurements shall be made.  For reference, a correction of +3dB(A) shall be made to the free-field measurements. The ET Leader shall agree with the ER/IEC on the monitoring positions and the corrections adopted.  Once the positions for the monitoring stations are chosen, the baseline monitoring and the impact monitoring shall be carried out at the same positions.

3.3          Noise Parameters for Construction Noise

3.3.1       The construction noise level shall be measured in terms of the A-weighted equivalent continuous sound pressure level (Leq).  Leq (30 min) shall be used as the monitoring parameter for the time period between 0700-1900 hours on normal weekdays.  For all other time periods, Leq (5 min) shall be employed for comparison with the NCO criteria.

3.3.2       As supplementary information for data auditing, statistical results such as L10 and L90 shall also be obtained for reference. Appendix B-2 shows a sample data record sheet for construction noise monitoring.

3.4          Noise Monitoring Stations for Construction Noise

3.4.1       Five representative Noise Monitoring Locations (NMLs) are proposed in Table 3.1 below and shown in Figure 3.1.

Table 3.1               Proposed Construction Noise Monitoring Locations

Monitoring Location ID

ID no. in EIA Report

Description

Land Uses

NMC01

NKSP-101

Kei Shun Special School

Educational

NMC02

NSLD-304

Shun Lee Disciplined Services Quarters Block 6

Residential

NMC03

NFNS-301

Sienna Garden Block 6

Residential

NMC04

NPTE-301

Po Tat Estate Tat Kai House

Residential

NMC05

NHWC-204

Hong Wah Court Block B Yee Hong House

Residential

 

3.4.2       The status and locations of noise sensitive receivers may change after issuing this manual.  In this event, the ET Leader shall propose updated monitoring locations and seek approval from ER and the IEC and agreement from EPD of the proposal.

3.4.3       When alternative monitoring locations are proposed, the monitoring locations should be chosen based on the following criteria:

Ÿ    At locations close to the major site activities which are likely to have noise impacts;

Ÿ    Close to the most affected existing noise sensitive receivers; and

Ÿ    For monitoring locations located in the vicinity of the sensitive receivers, care should be taken to cause minimal disturbance to the occupants during monitoring.

3.5          Baseline Monitoring for Construction Noise

3.5.1        The ET shall carry baseline noise monitoring prior to the commencement of the construction works to determine the background noise.. Daily measurement of A-weighted levels Leq, L10 and L90 shall be conducted for at least two weeks. Daily sampling periods should include: (i) between 0700 and 1900 hours; (ii) between 1900 and 2300 hours; and (iii) between 2300 to 0700 hours of next day. Each of the daily sampling periods shall include 30 minutes (six consecutive Leq(5min) readings). A schedule on the baseline monitoring shall be submitted to the ER/IEC for approval before the monitoring starts.

3.5.2       During the baseline monitoring, there should be no major construction activities near the monitoring stations.

3.5.3       Alternative baseline NML that can give representative baseline result may be proposed for ER and IEC’s approval with justifications.

3.5.4       In exceptional cases, when insufficient baseline monitoring data or questionable results are obtained, the ET shall liaise with the IEC to agree on an appropriate set of data to be used as a baseline reference and submit to ER for approval.

3.6          Impact Monitoring for Construction Noise

3.6.1       Noise monitoring shall be carried out at all the designated monitoring locations.  The monitoring frequency shall depend on the scale of the construction activities.  The following is an initial guide on the regular monitoring frequency for each station on a per week basis when noise generating activities are underway:

Ÿ    One set of measurements between 0700-1900 hours on normal weekdays (six consecutive Leq/5min readings);

Ÿ    One set of measurements between 1900-2300 hours;

Ÿ    One set of measurements between 2300-0700 hours of next day; and

Ÿ    One set of measurements between 0700-2300 hours on holidays.

3.6.2       For the latter 3 sets of measurements specified in Section 3.6.1 above, one set of measurements shall at least include 3 consecutive Leq(5min) results.

3.6.3       If a school exists near the construction activity, noise monitoring shall be carried out at the monitoring stations for the schools during the school examination periods. The ET Leader shall liaise with the school’s personnel and the Examination Authority to ascertain the exact dates and times of all examination periods during the course of the contract.

3.6.4       In case of non-compliance with the construction noise criteria, more frequent monitoring as specified in the Action Plan in Section 3.7.1 shall be carried out.  This additional monitoring shall be continued until the recorded noise levels are rectified or proved to be irrelevant to the construction activities.

3.7          Event and Action Plan

3.7.1       Noise Standards for Daytime Construction Activities are specified under EIAO-TM. The Action and Limit levels for construction noise are defined in Table 3.2. Should non-compliance of the criteria occurs, action in accordance with the Action Plan in Table 3-3 shall be carried out. Necessary mitigation measures are shown in Section 3.8. Timing and responsibilities for the implementation of mitigation measures are shown in Implementation Schedule in Appendix C.

Table 3.2               Action and Limit Levels for Construction Noise

Time Period

Action

Limit

0700-1900 hrs on normal weekdays

When one documented complaint is received

75* dB(A)

0700-2300 hrs on holidays (including Sundays); and 1900-2300 hrs on all days

60/65/70** dB(A)

2300-0700 hrs of all days

45/50/55**dB(A)

Notes:

Construction noise during restricted hours is under the control of Noise Control Ordinance.

*   reduce to 70 dB(A) for schools and 65 dB(A) during school examination periods.

** to be selected based on Area Sensitivity Rating.


Table 3.3                             Event / Action Plan for Construction Noise

Event

Action

ET

IEC

ER

Contractor

Action Level exceeded

1. Notify ER, IEC and Contractor;

2. Carry out investigation;

3.  Report the results of investigation to the IEC, ER and Contractor;

4. Discuss with the IEC and Contractor on remedial measures required;

5. Increase monitor frequency to check mitigation effectiveness;

1. Review the investigation results submitted by the ET;

2. Review the proposed remedial measures by the Contractor and advise the ER accordingly;

3. Advise the ER on the effectiveness of the proposed remedial measures.

1. Confirm receipt of notification of failure in writing;

2. Notify Contractor;

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

4. Ensure remedial measures are properly implemented.

1. Submit noise mitigation proposals to ET Leader / ER;

2. Implement noise mitigation proposals.

Limit Level exceeded

1. Inform IEC, ER, Contractor and EPD;

2. Repeat measurements to confirm findings;

3. Increase monitoring frequency;

4. Identify source and investigate the cause of exceedance;

5. Carry out analysis of Contractor’s working procedures;

6. Discuss with the IEC, Contractor and ER on remedial measures required;

7. Assess effectiveness of Contractor’s remedial actions and keep IEC, EPD and ER informed of the results;

8. If exceedance stops, cease additional monitoring.

1. Discuss amongst ER, ET, and Contractor on the potential remedial actions;

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

 

1. Confirm receipt of notification of failure in writing;

2. Notify Contractor;

3. In consolidation with the IEC, agree with the Contractor on the remedial measures to be implemented;

4. Supervise the implementation of remedial measures;

5. If exceedance continues, consider stopping the Contractor to continue working on that portion of work which causes the exceedance until the exceedance is abated.

1. Take immediate action to avoid further exceedance;

2.  Submit proposals for remedial actions to IEC and ER within 3 working days of notification;

3. Implement the agreed proposals;

4. Submit further proposal if problem still not under control;

5. Stop the relevant portion of works as instructed by the ER until the exceedance is abated.


3.8          Construction Noise Mitigation Measures

3.8.1       The EIA report has recommended construction noise control and mitigation measures as presented in Appendix C.  The Contractor shall be responsible for the design and implementation of these measures as listed below:

Ÿ    selection and optimization of construction programmes, avoidance of parallel operation of noisy PME, and/or reduction in number and/or the on-time percentage of PME during noise sensitive periods such as school examination period, and avoidance of noisy construction activities during school examination period by liaising with the school representatives;

Ÿ    use of Quality Powered Mechanical Equipment (QPME) and working methods;

Ÿ    use of temporary at-source noise mitigation measures such as noise barriers, noise fabric, noise enclosures, noise jacket and mufflers; and

Ÿ    use of good site practice to limit noise emission from construction site.

3.8.2       Examples of QPME are provided in Table 3.4 below.

Table 3.4               Examples of “Quiet” PME and Alternative Plants

Identification Code in GW-TM

Descriptions of PME

SWL in GW-TM, dB(A)

QPME example on QPME list [1]

SWL of QPME, dB(A)

CNP 081

Excavator

112

EPD-01145

99

CNP 185

Road Roller

108

EPD-02216

97

CNP 004

Asphalt Paver

109

EPD-01226

104

Note:

[1]         QPME list available on the EPD website

3.8.3       Good Practices are also recommended as follow:

Ÿ    use of well-maintained and regularly-serviced plant during the works;

Ÿ    plant operating on intermittent basis should be turned off or throttled down when not in active use;

Ÿ    plant that is known to emit noise strongly in one direction should be orientated to face away from the NSRs;

Ÿ    silencers, mufflers and enclosures for plant should be used where possible and maintained adequately throughout the works;

Ÿ    where possible fixed plants should be sited away from NSRs; and

Ÿ    stockpiles of excavated materials and other structures such as site buildings should be used effectively to screen noise from the works.

3.8.4       If the above measures are not sufficient to reduce the construction noise to the stipulated standards, upon the advice of ET Leader, the Contractor shall liaise with the ET Leader on alternative mitigation measures, propose such measures to the ER/IEC for approval, and implement the mitigation measures. 

3.8.5       Implementation status and the effectiveness of mitigation measures shall be audited through regular site inspection.

3.9          Parameters for Operational Traffic Noise

3.9.1       The ET should also carry out monitoring of road traffic noise after the works under Contract are completed and commence the operation of the Project.  The road traffic noise during operation of the Project should be measured in terms of the A-weighted equivalent of L10 (1-hr). During the traffic noise measurement, traffic count should also be undertaken concurrently. Supplementary information for data auditing and statistical results such as Leq and L90 should also be obtained for reference.

3.9.2       Noise measurements shall not be made in fog, rain, wind with a steady speed exceeding 5m/s or wind with gusts exceeding 10m/s.  The wind speed shall be checked with a portable wind speed meter capable of measuring the wind speed in m/s.

3.10        Monitoring Locations for Operational Traffic Noise

3.10.1    Those most affected noise sensitive receivers identified in the EIA report has been identified as the noise monitoring locations in this EM&A Manual. The traffic noise monitoring locations during operational phase are listed in Table 3.5 and shown in Figure 3.2. In addition, noise monitoring shall be carried out for one year following construction.  The locations for operational noise monitoring shall be defined during detailed design on the basis of the status of the most up-to-date information on proposed developments surrounding the Project.

Table 3.5               Traffic Noise Monitoring Locations

Monitoring Location ID

ID no. in
EIA Report

Description

Land Uses

NMT01

NSLD-201

Shun Lee Disciplined Services Quarters Block 7

Residential

NMT02

NSLE-202

Shun Lee Estate Lee Ming House

Residential

NMT03

NFNS-301

Sienna Garden Block 6

Residential

NMT04

NPTE-301

Po Tat Estate Tat Kai House

Residential

NMT05

NHWC-204

Hong Wah Court Block B Yee Hong House

Residential

 

3.10.2    The status and locations of noise sensitive receivers may change after issuing this manual.  In this event, the ET Leader shall propose updated monitoring locations and seek approval from ER/IEC and agreement from EPD of the proposal.

3.10.3    When alternative monitoring locations are proposed, the monitoring locations should be chosen based on the following criteria in that they should be:

Ÿ    At locations close to the major site activities which are likely to have noise impacts;

Ÿ    Close to the noise sensitive receivers; and

Ÿ    For monitoring locations located in the vicinity of the sensitive receivers, care should be taken to cause minimal disturbance to the occupants during monitoring.

3.11        Baseline Monitoring

3.11.1    No baseline monitoring is required for Operational Road Traffic Noise.

3.12        Operational Traffic Noise Impact Monitoring

3.12.1    Traffic noise monitoring shall be carried out at all the designated traffic noise monitoring stations. The following is an initial guide on the traffic noise monitoring requirements during the operational phase:

Ÿ    One set of measurements at the morning traffic peak hour on normal weekdays;

Ÿ    One set of measurements at the evening traffic peak hour on normal weekdays;

Ÿ    A concurrent census of traffic flow and percentage heavy vehicle shall be conducted for the Project roads and the existing road network in the vicinity of each measuring point;

Ÿ    Average vehicle speed estimated for Project road and the existing road network in the vicinity of each measuring points; and

Ÿ    The two sets of monitoring data should be obtained within the first year of operation.

3.12.2    The ET should prepare and deposit to EPD, at least 6 months before the operation of the proposed roads under the Project, a monitoring plan for the purpose of assessing the accuracy of traffic noise predictions by comparing the noise impact predictions with the actual impacts. The monitoring plan should contain monitoring locations, monitoring schedules, methodology of noise monitoring including noise measurement procedures, traffic counts and speed checks, and methodology of comparison with the predicted levels. The ET should implement the monitoring plan in accordance with the deposited monitoring plan unless with prior justifications. Monitoring details and results including the comparison between the measured noise levels and the predicted levels should be recorded in a report to be deposited with EPD within one month of the completion of the monitoring. The report should be certified by the ET Leader before deposit with EPD. A sample data record sheet for traffic noise monitoring is presented in Appendix B3.

3.12.3    Measured noise levels should be compared with predicted noise levels by applying appropriate conversion corrections to allow for the traffic conditions at the time of measurement.

3.12.4    Each set of measurements shall include three measurements of 30 minutes. The parameters L10, Leq, L90 and Lmax will be recorded for data auditing and reference.

3.13        Event and Action Plan for Traffic Noise

3.13.1    For traffic noise, the measured/monitored noise levels shall be compared with the predicted results and the predicted traffic flow conditions (calculated noise levels based on concurrent traffic census obtained).  In case discrepancies are observed, explanation shall be given to justify the discrepancies.

3.14        Noise Mitigation Measures for Traffic Noise

3.14.1    The recommended noise mitigation measures in the EIA report are described below and illustrated in Figure 3.3 to Figure 3.5

At Sau Mau Ping Road and Lin Tak Road

 

·                SE1: about 59m of 7m tall semi-enclosure provided on Sau Mau Ping Road (shown in Figure 3.3 (Sheet 1 of 2));

·                CT1: about 97m of 7m tall cantilevered noise barrier with 3.5m long cantilever (at 45°) on Sau Mau Ping Road (shown in Figure 3.3 (Sheet 1 of 2));

·                CT2: about 77m of 5.5m tall cantilevered noise barrier with 3.5m long cantilever (at 30°) on Sau Mau Ping Road (shown in Figure 3.3 (Sheet 1 of 2));

·                CT3: about 91m of 5.5m tall cantilever noise barrier with 3.5m long cantilever (at 45°) on Lin Tak Road flyover (shown in Figure 3.3 (Sheet 1 of 2)).

·                VB1: about 92m of 3m vertical noise barrier on Sau Mau Ping Road (shown in Figure 3.3 (Sheet 1 of 2))

 

At J/O Clear Water Bay Road and On Sau Road and J/O Clear Water Bay Road and New Clear Water Bay Road

 

·                CT4: about 24m of 7m tall cantilevered noise barrier with 3.5m long cantilever (at 45°) on Clear Water Bay Road /On Sau Road (shown in Figure 3.4);

·                SE2: about 146m of 7m tall semi-enclosure provided on Clear Water Bay Road /On Sau Road (shown in Figure 3.4);

 

At New Clear Water Bay Road and Shun Lee Tsuen Road

 

·                FE1: about 130m of 7m tall full-enclosure provided on Shun Lee Tsuen Road (shown in Figure 3.5) ;

·                CT5: about 45m of 7m tall cantilevered noise barrier with 3.5m long cantilever (at 45°) on Shun Lee Tsuen Road (shown in Figure 3.5);

·                CT6: about 40m of 7m tall cantilevered noise barrier with 3.5m long cantilever (at 45°) on Shun Lee Tsuen Road (shown in Figure 3.5).

 

                  


4              Water Quality Impact

4.1          Introduction

4.1.1       As recommended in the EIA Report, inland water quality monitoring should be carried out during the construction works of the Project to ensure that any unacceptable increase in suspended solids / turbidity and decrease in dissolved oxygen in the nearby inland waters due to the construction activities could be readily detected and timely action be taken to rectify the situation.  It is also recommended that regular site inspections during the entire construction phase should be undertaken to inspect the construction activities and works areas in order to ensure the recommended mitigation measures are properly implemented.

4.1.2       Adverse water quality impacts associated with the operation of the Project are not expected.  Thus, no water quality monitoring and audit programme is required during the Project operation.

4.1.3       This section describes the requirement of water quality monitoring during the construction works of the Project.

4.2           Water Quality Parameters

4.2.1       Dissolved oxygen (DO), turbidity, suspended solids (SS) level and pH should be monitored at designated water quality monitoring stations in the water courses. 

4.2.2       The levels of DO, turbidity and pH should be measured in situ whereas SS should be determined by laboratory analysis.

4.3          Monitoring Locations

4.3.1       As identified in the EIA Report, water quality monitoring is recommended for the channelized nullahs at Clear Water Bay Road and Ma Yau Tong Stream.  For the channelized nullahs at Clear Water Bay Road (near the northern Project site), one monitoring station, namely Station E, should be set in the water course upstream of the works area as a control station, and one impact monitoring station, namely Station F, should be set in the water course downstream of the works area as shown in Figure 4.1. Similarly, for Ma Yau Tong Stream (near the southern Project site), one monitoring station, namely Station H, should be set in the water course upstream of the Project works as a control station, and one impact monitoring station, namely Station I, should be set in the water course downstream of the works area as shown in Figure 4.1. Station I is selected at an open water course immediately downstream of the Project site boundary to provide an indication on the typical water quality condition during the Project works. All the water bodies further downstream of Station I are all within covered drainage or box culvert with access difficulty.   The proposed monitoring stations are also listed in Table 4.1 below.

Table 4.1               Proposed Water Quality Monitoring Stations

Inland Water

Stations

Description

Easting

Northing

Channelized nullah across the Project site

E

Upstream Control Station

841329

821753

F

Downstream Impact Station

841469

821635

Ma Yau Tong Stream

H

Upstream Control Station

843008

819880

I

Downstream Impact Station

842652

819573

 

4.3.2       Sampling should be taken at the water surface at all the designated monitoring stations. The monitoring station should not be influenced by any local pollution source so that representative data could be sampled.  The ET leader shall further review the status and suitability of the water quality monitoring stations prior to the commencement of the monitoring works, and where necessary propose with justification for changes to monitoring locations or other requirements of the EM&A programme, and seek approval from the IEC and EPD.

4.4          Baseline Monitoring

4.4.1       Baseline conditions in the watercourses should be established and agreed with EPD prior to the commencement of construction works.  The purpose of the baseline monitoring is to establish ambient conditions prior to the commencement of the works and to demonstrate the suitability of the proposed monitoring stations.  The baseline conditions should normally be established by measuring the water quality parameters including DO, turbidity, SS and pH as specified in Section 4.2.

4.4.2       The baseline monitoring should be taken at all designated monitoring stations, three days per week, for at least 4 weeks prior to the commencement of construction works. Temporal and spatial variations should be taken into account. There should not be any construction activities in the vicinity of the stations during the baseline monitoring. The interval between 2 sets of monitoring should not be less than 36 hours. Replicate in-situ measures should be carried out in each sampling event.

4.4.3       Baseline monitoring schedule should be submitted to EPD at least 4 weeks prior to the commencement of baseline monitoring.  EPD should also be notified immediately for any changes in schedule.

4.4.4       The baseline monitoring report should be submitted to EPD at least 4 weeks before the commencement of the construction works for agreement.  The baseline monitoring report should be certified by the IEC before submission to EPD.

4.5          Impact Monitoring

4.5.1       During the construction works of the Project, impact monitoring should be undertaken three days per week with sampling / measurement at the designated monitoring stations.  Upon completion of the construction works, the monitoring exercise at the designated monitoring locations should be continued for four weeks in the same manner as the impact monitoring.  The interval between two sets of monitoring should not be less than 36 hours except where there are exceedances of Action and/or Limit Levels, in which case the monitoring frequency will be increased.

4.5.2       Replicate in-situ measurements should be carried out in each sampling event.  The monitoring probes should be retrieved out of water after the first measurement and then redeployed for the second measurement.  Where the difference in value between the first and second readings of DO, turbidity or pH is more than 25% of the value of the first reading, the reading should be discarded and further readings should be taken. 

4.5.3       The water quality monitoring schedule should be submitted to EPD at least 1 week before the first day of the monitoring month.  EPD should be notified immediately of any changes in schedule.  If the monitoring data collected at the designated stations indicate that the Action or Limit Levels as shown in Table 4.3 are exceeded, appropriate actions should be taken in accordance with the Event and Action Plan in Table 4.4.

4.6          Site Audits

4.6.1       Implementation of regular site audits aim to ensure that the recommended mitigation measures are properly undertaken during proposed construction works.  It can also provide an effective control of any malpractices and therefore achieve continual improvement of environmental performance on site.

4.6.2       Site audits shall be carried out by the ET and shall be based on the mitigation measures for water pollution control recommended in the implementation schedule as presented in Appendix C.  In the event that the recommended mitigation measures are not fully or properly implemented, deficiency shall be recorded and reported to the site management.  Suitable actions are to be carried out to:

Ÿ    investigate the problems and the causes;

Ÿ    issue action notes to the Contractor who is responsible for the works;

Ÿ    implement remedial and corrective actions immediately;

Ÿ    re-inspect the site conditions upon completion of the remedial and corrective actions; and

Ÿ    record the event and discuss with the Contractor for preventive actions.

4.7          Field Log

4.7.1       Other relevant data should also be recorded, such as: monitoring location / position, time, water depth, weather conditions and any special phenomena underway near the monitoring station.  A sample data record sheet is shown in Appendix B4 for reference.

4.8          Monitoring Equipment and Procedures

Dissolved Oxygen and Temperature Measuring Equipment

4.8.1       The instrument should be a portable and weatherproof DO measuring instrument complete with cable and sensor, and use a DC power source.  The equipment should be capable of measuring:

Ÿ    a DO level in the range of 0 ‑ 20 mg/L and 0 ‑ 200% saturation; and

Ÿ    a temperature of 0 ‑ 45 degree Celsius.

Turbidity Measurement Instrument

4.8.2       The instrument should be a portable and weatherproof turbidity-measuring instrument using a DC power source.  It should have a photoelectric sensor capable of measuring turbidity between 0 - 1000 NTU (for example, Hach model 2100P or an approved similar instrument).

pH Measurement Instrument

4.8.3       The instrument should consist of a potentiometer, a glass electrode, a reference electrode and a temperature-compensating device.  It should be readable to 0.1pH in a range of 0 to 14.  Standard buffer solutions of at least pH 7 and pH 10 should be used for calibration of the instrument before and after use.

Sampler

4.8.4       A water sampler is required.  It should comprise a transparent PVC cylinder, with a capacity of not less than 2 litres, which can be effectively sealed with latex cups at both ends.  The sampler should have a positive latching system to keep it open and prevent premature closure until released by a messenger when the sampler is at the selected water depth (for example, Kahlsico Water Sampler or an approved similar instrument).

Sample Containers and Storage

4.8.5       Water samples for SS should be stored in high density polythene bottles with no preservative added, packed in ice (cooled to 4°C without being frozen) and delivered to the laboratory and analysed as soon as possible after collection.  Sufficient volume of samples should be collected to achieve the detection limit stated in Table 4.2.

Calibration of In-Situ Instruments

4.8.6       The DO meter and turbidimeter should be checked and calibrated before use.  DO meter and turbidimeter should be certified by a laboratory accredited under HOKLAS or any other international accreditation scheme, and subsequently re-calibrated at three monthly intervals throughout all stages of the water quality monitoring.  Responses of sensors and electrodes should be checked with certified standard solutions before each use.  Wet bulb calibration for a DO meter should be carried out before measurement at each monitoring location.

4.8.7       Sufficient stocks of spare parts should be maintained for replacements when necessary.  Backup monitoring equipment should also be made available so that monitoring can proceed uninterrupted even when some equipment is under maintenance, calibration, etc.

4.9          Laboratory Measurement / Analysis

4.9.1       Analysis of SS should be carried out in a HOKLAS or other international accredited laboratory.  Sufficient water samples should be collected at the monitoring stations for carrying out the laboratory determinations. The determination work should start within 24 hours after collection of the water samples.  The analyses should follow the American Public Health Association (APHA) Standard Methods for the Examination of Water and Wastewater or an equivalent method subject to the approval of EPD.  Analytical methods and detection limits for SS are present in Table 4.2.

Table 4.2               Analytical Methods to be Applied to Water Quality Samples

Parameters

Analytical Method

Detection Limit

Suspended Solids

APHA 2540D *

1 mg/L

Note:

* APHA  American Public Health Association Standard Methods for the Examination of Water and Wastewater

 

4.9.2       The testing of SS should be HOKLAS accredited (or if not, approved by EPD) and comprehensive quality assurance and control procedures in place in order to ensure quality and consistency in results.

4.9.3       Detailed testing methods, pre-treatment procedures, instruments use, Quality Assurance / Quality Control (QA/QC) details (such as blank, spike recovery, number of replicate samples per batch, etc.), detection limit and accuracy shall be submitted to EPD for approval prior to the commencement of monitoring programme.  EPD may also request the laboratory to carry out analysis of known standards provided by EPD for quality assurance.  The QA/QC shall be in accordance with the requirements of HOKLAS or international accredited scheme.  The QA/QC results shall be reported.  The testing methods and related proposal should be checked and certified by IEC before submission to EPD for approval.

4.9.4       Additional replicate samples may be required by EPD for inter-laboratory calibration.  Remaining samples after analysis should be kept by the laboratory for 3 months in case repeat analysis is required.  If in-house or non-standard methods are proposed, details of the method verification may also be required to submit to EPD.  In any circumstance, the sample testing should have comprehensive quality assurance and quality control programmes.  The laboratory should prepare to demonstrate the programme to DEP or his representatives when requested.

4.10        Event and Action Plan

4.10.1    The water quality criteria, namely action and limit levels, are shown in Table 4.3.  These criteria should be applied to ensure that any deterioration of water quality is readily detected and timely action is taken to rectify the situation.  Should the monitoring results of the water quality parameters at any designated monitoring station exceed the water quality criteria, the actions in accordance with the Event and Action Plan summarized in Table 4.4 shall be carried out.

4.10.2    The ET Leader should assess the potential impacts on the water sensitive receiver based on the monitoring data.  The performance of the environmental management system (i.e. of the overall EM&A programme) should be reviewed by the ET Leader on a quarterly basis.  The findings of this review should be included in the quarterly EM&A summary reports, together with any recommendations to improve the performance of the EM&A programme.

Table 4.3               Action and Limit Levels for Water Quality

Parameters

Action Level

Limit Level

Surface DO in mg/L

5 percentile (%-ile) of baseline data

4 mg/L or 1%-ile of baseline data

Surface SS in mg/L

95 %-ile of baseline data or 120% of control station’s SS on the same day of measurement

25 mg/L or 99 %-ile of baseline or 130% of control station's SS on the same day of measurement

Surface Turbidity in NTU

 

95 %-ile of baseline data or 120% of control station’s turbidity on the same day of measurement

99 %-ile of baseline or 130% of control station's turbidity on the same day of measurement

Surface pH

Beyond the range 6.6 to 8.4

Beyond the range of  6.5 to 8.5

Note:      

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

(2)    For pH, action should be taken if the measured pH falls outside the specified range.

(3)    For SS and turbidity, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.

4.10.3    Mitigation measures for water quality control have been recommended in the EIA Report.  The Contractor should be responsible for the design and implementation of these measures.

4.10.4    Recommended mitigation measures to minimize the adverse impacts on water quality during the construction activities are listed in the implementation schedule given in Appendix C.

4.10.5    In the event of complaints or non-compliance / area of improvement being observed, the ET and the Contractor should review the effectiveness of these mitigation measures, design alternative or additional mitigation measures as appropriate and propose to the IEC for approval and implement these alternative or additional measures.


Table 4.4               Event and Action Plan for Water Quality

Event

ET Leader

IEC

ER

Contractor

Action level being exceeded by one sampling day

·         Repeat in situ measurement to confirm findings;

·         Identify reasons for non-compliance and source(s) of impact;

·         Inform IEC and Contractor;

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

·         Discuss mitigation measures with IEC, ER and Contractor;

·         Repeat measurement on next day of exceedance.

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

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

·         Assess the effectiveness of the implemented mitigation measures.

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

·         Make agreement on the mitigation measures to be implemented.

·         Supervise the implementation of remedial measures.

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

·         Rectify unacceptable practice;

·         Check all plant and equipment;

·         Consider changes of working methods;