PAGE

1 Introduction............................................................................................................... 1

1.1 Purpose of the Manual................................................................................................... 1

1.2 Background................................................................................................................... 2

1.3 Description of EIA Study............................................................................................... 3

1.4 Environmental Monitoring & Audit Requirements............................................................ 3

1.5 Project Organisation....................................................................................................... 3

1.5.2 Environmental Team......................................................................................... 3

1.5.3 Engineer/Engineer’s Representative.................................................................. 4

1.5.4 Contractor......................................................................................................... 4

1.6 Decommissioning Programme......................................................................................... 5

1.7 Structure of the EM&A Manual...................................................................................... 5

2 Noise................................................................................................................................... 6

2.1 Noise Monitoring Requirement....................................................................................... 6

2.2 Noise Parameters........................................................................................................... 6

2.3 Monitoring Equipment.................................................................................................... 6

2.4 Monitoring Locations..................................................................................................... 7

2.5 Baseline Monitoring........................................................................................................ 8

2.6 Impact Monitoring.......................................................................................................... 8

2.7 Event and Action Plan for Noise..................................................................................... 9

2.8 Noise Mitigation Measures............................................................................................. 9

3 Air Quality................................................................................................................... 11

4 Land Contamination............................................................................................. 12

5 Cultural Heritage.................................................................................................. 15

6 Waste Management................................................................................................ 16

7 Water Quality............................................................................................................ 17

8 Site Environmental Audit.................................................................................. 18

8.1 Site Inspection............................................................................................................. 18

8.2 Compliance with Legal and Contractual Requirement.................................................... 19

8.3 Environmental Complaints............................................................................................ 20

9 Reporting..................................................................................................................... 22

9.1 General........................................................................................................................ 22

9.2 Baseline Monitoring Report.......................................................................................... 22

9.3 Monthly EM&A Reports.............................................................................................. 23

9.3.2 First Monthly EM&A Report........................................................................... 23

9.3.3 Subsequent EM&A Reports............................................................................. 24

9.4 Data Keeping............................................................................................................... 26

APPENDICES

Apppendix 1 Implementation Schedule

Apppendix 2 Sample Data Sheets of Monitoring

Apppendix 3 Proposed Noise Monitoring Locations

Apppendix 4 Sample of Complaints Proforma

FIGURES

Figure 1.1 Locations of Site and Sensitive Receivers

Figure 1.2 Project Organisation

Figure 8.1 Complaint Response Procedure

1 Introduction

1.1 Purpose of the Manual

1.1.1.1 The purposes of this Environmental Monitoring and Audit (EM&A) Manual are:

· to guide the setup of an EM&A programme; and

· to ensure compliance with the recommendations suggested in the EIA Report.

1.1.1.2 This Manual outlines the monitoring and audit programme to be undertaken for the decommissioning, dismantling and removal of four underground diesel storage tanks at Tsuen Wan No.1 Pumping Station. It aims to provide systematic procedures for monitoring, auditing and minimising the environmental impacts associated with the decommissioning of the underground diesel storage tanks.

1.1.1.3 Relevant information in the Hong Kong environmental regulations, EPD’s generic EM&A manual, and recommendations in the EIA study report on the decommissioning, dismantling and removal of four underground diesel storage tanks at Tsuen Wan No.1 Pumping Station have been used to set up this Manual.

1.1.1.4 This Manual contains the following:

a) Responsibilities of the Contractor, the Engineer or Engineer’s Representative (ER), Environmental Team (ET) with respect to the EM&A requirements during decommissioning of the underground diesel storage tanks;

b) Information on project organization and programming of decommissioning activities for the project;

c) Requirements with respect to the decommissioning schedule and the necessary environmental monitoring and audit programme to track the varying environmental impact;

d) Full details of the methodologies to be adopted, including all field, laboratory and analytical procedures, and details on quality assurance;

e) Definition of Action and Limit levels;

f) Establishment of event and action plans;

g) Requirements of reviewing pollution sources and working procedures required in the event of non-compliance of the environmental criteria and complaints;

h) Requirements for review of EIA predictions, implementation of mitigation measures, and the effectiveness of the environmental protection and pollution control measures adopted;

i) Requirements of presentation of environmental monitoring and audit data and appropriate reporting procedures.

1.1.1.5 For the purpose of this manual, the "Engineer" shall refer to the Engineer as defined in the Contract or the Engineer's Representative (ER), in cases where the Engineer's powers have been delegated to the ER, in accordance with the Contract. The ET leader, who shall be responsible for and in charge of the ET, shall refer to the person, delegated the role of executing the EM&A requirements.

1.2 Background

1.2.1.1 Tsuen Wan No.1 Pumping Station is situated at the southeast corner of the intersection between Wai Tsuen Road and Miu Kong Street. The location of the site is shown on Figure 1.1.

1.2.1.2 The Pumping Station has been in operation since 1955. All pumpsets and associated power supply and control equipment are now approaching the end of their serviceable lives. To improve the operation of the Pumping Station, the existing manned equipment including pumpsets, electrical switchgears, and piping and valving systems will be replaced. The seven electrical motor driven and three diesel engine driven pumpsets currently in use are to be replaced by eight electrical pumpsets.

1.2.1.3 With the phasing out of the three diesel engine driven pumpsets, the four underground diesel fuel storage tanks at the Pumping Station, each with a capacity of 64,000 litres will be decommissioned, dismantled and removed.

1.2.1.4 The Pumping Station is surrounded by various sensitive receivers, which include residential buildings, education centres, an indoor recreation centre and historical buildings. Figure 1.1 gives the locations of these sensitive receivers.

1.3 Description of EIA Study

1.3.1.1 Ove Arup & Partners (Arup) was commissioned by the Water Supplies Department (WSD) to conduct an Environmental Impact Assessment (EIA) Study for the decommissioning of underground fuel tanks at Tsuen Wan No.1 Pumping Station. This decommissioning work forms part of the project - uprating the safety, reliability and efficiency of the aged mechanical and electrical plant at Tsuen Wan No. 1 Pumping Station.

1.3.1.2 The work element – decommissioning and removal of the underground diesel fuel storage tanks, of the Project is categorized under Item 16 Part II of Schedule 2 of the Environmental Impact Assessment Ordinance (Cap 499) (EIAO) as a Designated Project. An EIA study shall be carried out in accordance with the Study Brief (ESB-045/1999) issued by Environmental Protection Department (EPD) in January 2000. An Environmental Monitoring and Audit Manual is therefore produced as part of the Study Brief requirement.

1.4 Environmental Monitoring & Audit Requirements

1.4.1.1 The EIA results have been reported in the EIA report. A summary of the recommendation and the implementation schedule is attached in Appendix 1 for reference.

1.5 Project Organisation

1.5.1.1 The project should form an organization consisting of the ET, ER and Contractor to take the responsibilities of the environmental protection matters. The ET should not be any associated body of the Contractor. The project organization and lines of communication with respect to environmental protection works are shown in Figure 1.2. The responsibilities of respective parties are detailed in the following sub-sections.

1.5.2 Environmental Team

1.5.2.1 The Environmental Team should be led by an Environmental Team Leader (ET Leader), who should have at least 7 years experience in EM&A or environmental management. The duties of the Environmental Team are:

a) To meet the agreed objectives and deadlines as set out in this EM&A Manual;

b) To monitor the various environmental parameters as required by this Manual;

c) To follow up and close out of the non-compliance actions;

d) To investigate and audit the Contractor’s equipment and work methodologies with respect to pollution control and environmental mitigation and to anticipate environmental issues that may require mitigation before the problem arises;

e) To audit and prepare audit reports on the environmental monitoring data and the site environmental conditions; and

f) To report the environmental monitoring and audit results to the Contractor, the Engineer and EPD.

1.5.3 Engineer/Engineer’s Representative

1.5.3.1 The Engineer’s Representative (ER) shall:

a) Appoint an ET to undertake monitoring and reporting of EM&A, and to arrange laboratory analysis as necessary;

b) Monitor the Contractor’s compliance with contract specifications, including the effective implementation and operation of the environmental mitigation measures;

c) Instruct the Contractor to follow the agreed protocols or those in the Contract Specifications in the event of exceedances or complaints; and

d) Comply with the agreed Event Contingency Plan in the event of any exceedance.

1.5.4 Contractor

a) Provide assistance to ET in carrying out monitoring;

b) Submit proposals on mitigation measures in case of exceedances of Action and Limit levels in accordance with the Event Contingency Plan;

c) Implement measures to reduce impact where Action and Limit levels are exceeded; and

d) Work within the scope of the construction contract and other tender conditions with respect to environmental requirements.

1.6 Decommissioning Programme

1.6.1.1 It has been advised that the decommissioning works of the underground diesel storage tanks will be undertaken from June 2002 to December 2002.

1.7 Structure of the EM&A Manual

1.7.1.1 The structure of this EM&A Manual is outlined below for easy reference:

Section	Title	Aims
1	Introduction	An introduction of the background information and the layout of the EM&A Manual
2	Construction Noise	Outline the requirements, methodology, equipment, monitoring locations, and criteria for noise monitoring
3	Air Quality	List the information reviewed in the EIA study
4	Land Contamination	List the information reviewed in the EIA study
5	Cultural Heritage	List the information reviewed in the EIA study
6	Waste Management	List the information reviewed in the EIA study
7	Water Quality Assessment	List the information reviewed in the EIA study
8	Site Environmental Audit	Present the requirement and recommendations for the site environmental audit
9	Reporting	Present the requirement and recommendations for reporting

Appendices	Description
1	Implementation Schedule
2	Sample Data Sheets of Monitoring
3	Proposed Noise Monitoring Locations
4	Sample of Complaints Proforma

2 Noise

2.1 Noise Monitoring Requirement

2.1.1.1 In this section, the requirements, methodology, equipment, monitoring locations, criteria and protocols for the monitoring and audit of noise impacts during the decommissioning period of the Project are presented.

2.2 Noise Parameters

2.2.1.1 The construction noise level shall be measured in terms of the A-weighted equivalent continuous sound pressure level (L_eq). L_{eq(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, L_{eq(5 min)} shall be employed for comparison with the NCO criteria.

2.2.1.2 As supplementary information for data auditing, statistical results such as L₁₀ and L₉₀ shall also be obtained for reference. A sample data record sheet is shown in Appendix 2 for reference.

2.3 Monitoring Equipment

2.3.1.1 As referred to 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 agree to within 1.0dB.

2.3.1.2 Noise measurements should not be made in the presence of fog, rain, wind with a steady speed exceeding 5ms^-1 or wind with gusts exceeding 10ms^-1. The wind speed shall be checked with a portable wind speed meter capable of measuring the wind speed in m/s.

2.3.1.3 The ET Leader is responsible for the provision of the monitoring equipment. He shall ensure that sufficient noise measuring 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 labeled.

2.4 Monitoring Locations

2.4.1.1 The noise monitoring locations are shown in Appendix 3 and Table 2.1. The status and locations of noise sensitive receivers may change after issuing this manual. If such cases exist, the ET Leader shall propose updated monitoring locations and seek approval from ER and agreement from EPD of the proposal.

Table 2.1 : Description of noise monitoring locations

NSR ID