Baseline Environmental

Monitoring Report

(Final)

Client	Territory Development Department, Hong Kong Hong Kong Island and Islands Development Office
Project	Supplementary Agreement No. 3 to Agreement No. CE 15/94 Central Reclamation, Phase III Design and Construction for the Minimum Option
Report No.	3128-REP-133-01		Copy No.
Date of Issue	24 June 2003		File Ref. L:\S-proj\CR3\CR3.NEW\3128\ Reports\0133_01.doc
Report Title	Baseline Environmental Monitoring Report (Final)
	Name	Sign		Date
Prepared by :	Albert Chan			24 June 2003
Reviewed by :	Susana Bezy			24 June 2003
Authorised by :	Jon Varndell			24 June 2003
Distribution
Copy No	Issue to	Attention		Corr. Ref.
1 - 2	TDD	Mr H H Yeung		3128/124/OC4776/al
3 - 5	EPD	Mr Thomas To		3128/124/OC4776/al
6	EPD (WP& PG)	Ms W Leung		3128/124/OC4776/al
7	IEC	Mr Bill Douglas		3128/124/OC4776/al
8	ET Leader	Ms Susana Bezy		3128/124/OC4776/al
9	RSS	Mr Douglas Miller		3128/124/OC4776/al
10	LCSVO-JV	Mr Malcolm Plummer		3128/124/OC4776/al
11 - 12	Office Copy

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

1.1 Basic Project Information............................................................................................... 1

1.2 Designated Projects....................................................................................................... 1

1.3 Purpose Of Baseline Monitoring Report......................................................................... 2

1.4 Report Content............................................................................................................... 2

1.5 Report Structure............................................................................................................. 3

2. Air Quality.................................................................................................................... 5

2.1 Introduction................................................................................................................... 5

2.2 Air Quality Sensitive Receivers....................................................................................... 5

2.3 Baseline Air Quality Monitoring Parameters & Programme............................................ 5

2.4 Monitoring Methodology............................................................................................... 8

2.5 Monitoring Equipment................................................................................................... 9

2.6 Laboratory Measurement/Analysis................................................................................ 10

2.7 Baseline Monitoring Results......................................................................................... 10

2.8 Action And Limit Levels............................................................................................... 11

2.9 Recommendations....................................................................................................... 12

3. Noise Quality.............................................................................................................. 15

3.1 Introduction................................................................................................................. 15

3.2 Noise Quality Sensitive Receivers................................................................................ 15

3.3 Monitoring Requirements............................................................................................. 15

3.4 Monitoring Equipment................................................................................................. 15

3.5 Monitoring Parameters & Programme.......................................................................... 15

3.6 Monitoring Methodology............................................................................................. 16

3.7 Baseline Monitoring Results......................................................................................... 17

3.8 Action And Limit Levels............................................................................................... 17

3.9 Recommendations....................................................................................................... 18

4. Water Quality............................................................................................................. 21

4.1 Introduction................................................................................................................. 21

4.2 Water Quality Sensitive Receivers................................................................................ 21

4.3 Influencing Factors In The Area.................................................................................... 22

4.4 Baseline Water Quality Monitoring Programme........................................................... 22

4.5 Monitoring Methodology............................................................................................. 24

4.6 Monitoring Stations...................................................................................................... 24

4.7 Water Quality Parameters............................................................................................ 25

4.8 Equipment Used.......................................................................................................... 25

4.9 Laboratory Measurement/Analysis................................................................................ 26

4.10 Baseline Monitoring Results......................................................................................... 27

4.11 EPD Routine Water Quality Monitoring Data............................................................... 38

4.12 Comparison Of EPD Routine Monitoring Data With Baseline Monitoring.................... 43

4.13 Action And Limit Levels............................................................................................... 44

4.14 Recommendations....................................................................................................... 49

5. Conclusions................................................................................................................. 53

5.1 Overview..................................................................................................................... 53

5.2 Air Quality................................................................................................................... 53

5.3 Noise Quality.............................................................................................................. 53

5.4 Water Quality.............................................................................................................. 53

List of Figures

Figure 2.1 Dust and Noise Monitoring Stations

Figure 4.1 Outfall Locations

Figure 4.2 Water Quality Monitoring Stations at Representative Sea Water Intakes

Figure 4.3 Marine Based Water Quality Monitoring Stations

List of Annexes

Annex A Air Quality Monitoring Data

Annex B Graphical Representation of Dust Monitoring Results

Annex C Noise Monitoring Data

Annex D Correspondence with Seawater Intake Operators

Annex E Report on Calibration

Annex F Water Quality Monitoring Data

Annex G Graphical Presentation of Baseline Water Quality Monitoring Data

Annex H Statistical Analysis of Baseline Monitoring Results

Annex I Graphical Presentation of EPD Routine Monitoring Data

Annex J Intake Operator Correspondence on Water Quality Criteria for Intakes

List of Tables

Table 2.1- Air Quality Monitoring Programme at City Hall Station.................................................. 6

Table 2.2 - Air Quality Monitoring Programme at PLA Station........................................................ 7

Table 2.3 - Equipment Used for Dust Monitoring.......................................................................... 9

Table 2.4 – Summary of Baseline Air Quality Monitoring Results................................................. 10

Table 2.5 - Air Quality Action and Limit Levels for the City Hall Monitoring Station.................... 11

Table 2.6 – Air Quality Action and Limit Levels for the PLA Monitoring Station............................ 11

Table 2.7 – Event and Action Plan for Air Quality......................................................................... 13

Table 3.1 – Noise Monitoring Equipment..................................................................................... 15

Table 3.2 – Noise Quality Monitoring Programme at City Hall Station......................................... 16

Table 3.3 - Summary of Baseline Noise Quality Monitoring Results.............................................. 17

Table 3.4 –Construction Noise Action and Limit Levels................................................................ 17

Table 3.5 – Event and Action Plan for Noise Quality.................................................................... 19

Table 4.1 - Water Quality Monitoring Programme........................................................................ 22

Table 4.2 - Monitoring Station Co-ordinates.................................................................................. 25

Table 4.3 - Equipment Used for Marine Water Quality Monitoring............................................... 26

Table 4.4 - Water Sample Handling Requirements........................................................................ 26

Table 4.5 - Summary of Dissolved Oxygen (mg/L)......................................................................... 28

Table 4.6 - Summary of Dissolved Oxygen (% Saturation)............................................................ 29

Table 4.7 - Summary of Turbidity (NTU)....................................................................................... 30

Table 4.8 - Summary of Suspended Solids (mg/L).......................................................................... 31

Table 4.9 - Summary of Dissolved Oxygen (mg/L)........................................................................ 33

Table 4.10 - Summary of Dissolved Oxygen (% Saturation).......................................................... 34

Table 4.11 - Summary of Turbidity (NTU)..................................................................................... 35

Table 4.12 - Summary of Suspended Solids (mg/L)........................................................................ 36

Table 4.13 - EPD Routine Monitoring Data Year 2002 - Dissolved Oxygen (mg/L)....................... 39

Table 4.14 - EPD Routine Monitoring Data Year 2002 - Dissolved Oxygen (% Saturation).......... 40

Table 4.15 - EPD Routine Monitoring Data Year 2002 – Turbidity (NTU).................................... 41

Table 4.16 - EPD Routine Monitoring Data Year 2002 – Suspended Solids (mg/L)....................... 42

Table 4.17 – Summary of Year 2002 EPD Routine Monitoring Data............................................. 43

Table 4.18 - Comparison of Baseline Monitoring Results with EPD Routine Monitoring Data...... 44

Table 4.19 - Action and Limit Level Criteria for Marine-Based Stations......................................... 45

Table 4.20 - Calculated Action and Limit Levels at Marine-Based Stations (Based on EPD Year

.................. 2002 and Baseline Monitoring Data)......................................................................... 46

Table 4.21 - Seawater Intake Water Quality Requirements............................................................ 47

Table 4.22 -Calculated Action and Limit Levels for Intake Stations (Baseline Monitoring Results) . 48

Table 4.23 – Event and Action Plan for Water Quality.................................................................. 51

ACL	Atkins China Limited
AL	Action and Limit
CRIII	Central Reclamation Phase III
DEP	Director of Environmental Protection
DO	Dissolved Oxygen
EIA	Environmental Impact Assessment
EIAO	Environmental Impact Assessment Ordinance
EIAO TM	Technical Memorandum on Environmental Impact Assessment Process
EM&A	Environmental Monitoring and Audit
EOT	Extended Overrun Tunnel
EPD	Environmental Protection Department
ER	Engineer’s Representative
ET	Environmental Team
FEP	Further Environmental Permit
GPS	Global Positioning System
HKAPA	Hong Kong Academy of Performing Arts
HKSAR	Hong Kong Special Administrative Region
HVS	High Volume Sampler
IEC	Independent Environmental Checker
LCSD	Leisure and Cultural Services Department
LCSVO-JV	Leighton-China State-Van Oord Joint Venture
Leq	A-weighted equivalent sound pressure levels
MTRC	Mass Transit Railway Corporation
PLA	People’s Liberation Army
SLM	Sound Level Meter
SS	Suspended Solids
TDD	Territory Development Department
TSP	Total Suspended Particulate

Executive Summary

This is the Baseline Monitoring Report prepared by Atkins China Limited (ACL) for the Central Reclamation Phase III (CRIII) project. In accordance with the EM&A Manual, baseline monitoring was conducted prior to commencement of construction works. This report presents the monitoring results of the baseline air quality, noise and water quality monitoring for CRIII.

The Baseline Monitoring Report has been prepared in compliance with the CRIII project’s Further Environmental Permit (FEP-01/122/2003), Environmental Monitoring and Audit (EM&A) Manual and the Technical Memorandum on Environmental Impact Assessment Process, EIAO, Cap. 4899, S.16).

Baseline air quality monitoring was undertaken at two representative sensitive receiver locations, City Hall and the PLA Headquarters. The baseline monitoring of air quality included 1-hour and 24-hour TSP monitoring, which was undertaken in March 2003. The baseline TSP monitoring data was processed, reviewed and analysed to establish the Action and Limit Levels for 1-hour and 24-hour TSP Levels to be used during impact monitoring.

Baseline noise monitoring was undertaken at one representative sensitive receiver location, City Hall, in March and April 2003. The baseline monitoring included 24-hour noise monitoring, covering daytime, evening-time and night-time periods. Results from the monitoring work have been processed to establish baseline conditions and derive the proposed Action and Limit Levels to be used during the impact monitoring.

Baseline marine water quality, including dissolved oxygen, turbidity and suspended solids was undertaken at fourteen designated monitoring stations, comprising 6 marine based stations and 8 seawater intake stations. Baseline monitoring was undertaken for a period of eight weeks, during mid-ebb and mid-flood tide conditions, between February and April 2003. This data was processed, reviewed and analysed to establish the Action and Limit Levels for dissolved oxygen, turbidity and suspended solids during impact monitoring.

No major construction activities influencing air quality, noise or marine water quality were identified during the baseline monitoring.

1. INTRODUCTION

1.1 Basic Project Information

1.1.1 The Territory Development Department (TDD) of the Hong Kong Special Administrative Region is implementing the Central Reclamation Phase III (CRIII) project. The CRIII project includes the following key aspects:

· The reclamation of approximately 18 hectares of land in Central and the construction of seawalls, roads and associated services. Also included in the construction works is the North Island Line Protection Works and Advance Trunk Road Tunnel (ATRT) for the Central-Wan Chai Bypass.

· The reprovisioning of Star Ferry Pier, public landing steps, moorings, and motor boat/launch operators’ kiosks.

· Provisions for external cooling water systems which consist of the cooling water pumping shells for future developments, and the reprovisioning of existing cooling water pumping stations and associated pipework systems and E&M works.

· The reprovisioning of the existing Leisure and Cultural Services Department (LSCD)’s facilities.

· The provision of a flood relief path, stormwater culvert extensions, upgrading of hinterland stormwater drainage resulting from the reclamation, and demolition of the existing waterfront structures and necessary landscaping.

· Construction of the Hong Kong Station Extended Overrun Tunnel (EOT) and associated ventilation structures entrusted for construction within the CRIII engineering works.

· Reprovisioning of the Government Heliport at the Wan Chai PCWA and reprovisioning of the Wan Chai PCWA at Chai Wan Basin

1.2 Designated Projects

1.2.1 The EIA Report provided an assessment of the following Designated Projects which are located within the Central District Area:

· Central Reclamation Phase III - Reclamation works (including associated dredging works) of about 18 ha in size;

· Roads P1, P2, D6, D7, D8, D9 and D11 - About 1.05 km of primary distributor and about 0.85km of district distributor roads;

· Central - Wan Chai Bypass Tunnel - About 0.95 km of tunnel; and

· North Island Line protection works - About 0.5 km of North Island Line protection works.

1.3 Purpose of Baseline Monitoring Report

1.3.1 The purpose of this Baseline Environmental Monitoring Report is to establish the existing environmental conditions prior to the commencement of the CRIII project construction works in accordance with the requirements of the Environmental Monitoring and Audit (EM&A) Manual for the project (Ref. EIA 055/2001). The baseline conditions will be used as the basis for environmental impact monitoring during construction.

1.3.2 Atkins China Limited (ACL) has been commissioned by TDD to undertake environmental management and monitoring work in accordance with the EM&A Manual.

1.3.3 As part of the conditions of the Further Environmental Permit for the CRIII project (FEP-01/122/2003; Part C, Condition 4.7), the Baseline Monitoring Report is required to be submitted to the Director of EP at least 2 weeks before commencement construction works. The submission shall be verified and certified by the Independent Environmental Checker (IEC).

1.4 Report Content

1.4.1 This Baseline Environmental Monitoring Report has been prepared in accordance with Annex 21 of the Technical Memorandum on Environmental Impact Assessment Process (EIAOTM) (EIAO, Cap. 499, S.16), Environmental Monitoring and Audit Documentation, Baseline Monitoring Report, and the Project EM&A Manual, Section 8.2, and includes the following information:

(a) up to half a page executive summary;

(b) brief project background information;

(c) drawings showing locations of the baseline monitoring stations;

(d) monitoring results (in both hard and diskette copies) together with the following information:

· monitoring methodology;

· name of laboratory and types of equipment used and calibration details;

· parameters monitored;

· monitoring locations (and depth);

· monitoring date, time, frequency and duration; and

· QA/QC results and detection limits.

(e) details on influencing factors, including:

· major activities, if any, being carried out on the site during the period;

· weather conditions during the period; and

· other factors which might affect the results.

(f) determination of the Action and Limit Levels for each monitoring parameter and statistical analysis of the baseline data; the analysis shall conclude if there is any significant difference between control and impact stations for the parameters monitored;

(g) details of influcencing factors, including:

· the major activities being carried out on site during the period;

· weather conditions during the period; and

· other factors which may affect the results.

(h) determination of Action and Limit Levels for each monitoring parameter and statistical analysis;

(i) revisions for inclusion in the EM&A Manual; and

(j) comments and conclusions.

1.5 Report Structure

1.5.1 Following this introduction Section, the remaining sections of this report have been set out as follows:

(a) Section 2 presents the baseline air quality monitoring results and proposed Action and Limit Levels;

(b) Section 3 presents the baseline noise quality monitoring results and proposed Action and Limit Levels;

(c) Section 4 presents the baseline water quality monitoring results and proposed Action and Limit Levels; and

(d) Section 5 provides the conclusions and recommendations.

2. air quality

2.1 Introduction

2.1.1 In accordance with the EM&A Manual, baseline monitoring of Total Suspended Particulate (TSP) levels at representative sensitive receiver locations was undertaken to record existing TSP levels in the area of the proposed works as identified in the EIA Report.

2.2 Air Quality Sensitive Receivers

2.2.1 Air sensitive receivers for the CRIII project include a number of hotels and commercial and office buildings in the urban area surrounding the CRIII project site. These buildings are centrally ventilated and air-conditioned but it is important that construction and operational activities of the Project do not generate air pollutant levels that exceed Air Quality Objectives at the building locations.

2.2.2 The relevant buildings listed in the CRIII project EM&A and EIA report as air sensitive receivers include: Crocodile Building, Hang Seng Bank Headquarters, Exchange Square I, II & III, Jardine House, Statue Square, Hong Kong Club Building, City Hall, Hutchison House, Bank of America Tower, Central Barracks, Admiralty Centre, Harcourt Centre, PLA Headquarters, The Hong Kong Acadamy of Performing Arts (HKAPA), Citic Tower, Shiu On Centre, Pedestrian Plaza, and HKCEC Extension.

2.2.3 The closest air quality sensitive receivers to the construction works, identified in the EIA Report and EM&A Manual, include City Hall and the PLA Headquarter Barracks. Fixed High Volume Samplers (HVS) were installed at these two sensitive receiver locations, as shown in Figure 2.1.

2.3 Baseline Air Quality Monitoring Parameters & Programme

2.3.1 The baseline TSP monitoring was conducted between 27 February 2003 and 15 March 2003 to determine the Action and Limit Levels for 1-hour TSP and 24-hour TSP. Daily 24-hr TSP samples were also collected during baseline monitoring. Sampling of 1-hour TSP was carried out 3 times per day.

2.3.2 The monitoring programme that was undertaken is provided in Table 2.1 for City Hall and Table 2.2 for the PLA Headquarters monitoring stations.

Table 2.1- Air Quality Monitoring Programme at City Hall Station

Date of Sampling	Parameter	Period	Frequency
27 February 2003	24-hour TSP	09:32 – 10:09	Once per day
28 February 2003	1-hour TSP	13:30 – 16:30	3 times/day
	24-hour TSP	09:45 – 09:59	Once per day
1 March 2003	1-hour TSP	10:00 – 13:00	3 times/day
	24-hour TSP	09:35 – 09:13	Once per day
2 March 2003	1-hour TSP	12:00 – 15:00	3 times/day
3 March 2003	1-hour TSP	10:45 – 13:45	3 times/day
	24-hour TSP	09:30 – 09:41	Once per day
4 March 2003	1-hour TSP	09:43 – 12:44	3 times/day
	24-hour TSP	09:27 – 09:11	Once per day
5 March 2003	1-hour TSP	Suspended ^A	¾
	24-hour TSP	09:29 – 09:15	Once per day
6 March 2003	1-hour TSP	11:06 – 14:12	3 times/day
	24-hour TSP	09:21 – 09:20	Once per day
7 March 2003	1-hour TSP	13:10 – 16:16	3 times/day
	24-hour TSP	09:30 – 09:30	Once per day
8 March 2003	1-hour TSP	10:29 – 13:32	3 times/day
	24-hour TSP	09:26 – 13:30	Once per day
9 March 2003	1-hour TSP	10:27 – 13:28	3 times/day
10 March 2003	1-hour TSP	14:10 – 18:10	3 times/day
	24-hour TSP	09:29 – 09:30	Once per day
11 March 2003	1-hour TSP	08:43 – 14:49	3 times/day
	24-hour TSP	09:45 – 09:33	Once per day
12 March 2003	1-hour TSP	08:41 – 14:45	3 times/day
	24-hour TSP	09:38 – 09:30	Once per day
13 March 2003	1-hour TSP	08:57 – 15:03	3 times/day
	24-hour TSP	09:44 – 09:44	Once per day
14 March 2003	1-hour TSP	08:45 – 15:00	3 times/day
	24-hour TSP	09:46 – 09:45	Once per day
15 March 2003	1-hour TSP	13:05 – 16:06 ^B	3 times/day

Notes: A - Baseline monitoring was partially suspended due to bad weather.
B - An additional 1-hour TSP measurement was performed to make up for monitoring which was
suspended due to adverse weather on 5 March 2003.

Table 2.2 - Air Quality Monitoring Programme at PLA Station

Date of Sampling	Parameter	Period	Frequency
27 February 2003	24-hour TSP	09:15 – 09:30	Once per day
28 February 2003	1-hour TSP	16:45 – 19:45	3 times/day
	24-hour TSP	09:40 – 09:16	Once per day
1 March 2003	1-hour TSP	14:01 – 17:11	3 times/day
	24-hour TSP	09:11 – 09:11	Once per day
2 March 2003	1-hour TSP	08:35 – 11:35	3 times/day
3 March 2003	1-hour TSP	14:00 – 17:00	3 times/day
	24-hour TSP	09:05 – 09:03	Once per day
4 March 2003	1-hour TSP	12:53 – 13:53 ^A	Once per day
	24-hour TSP	09:10 – 09:09	Once per day
5 March 2003	1-hour TSP	Suspended ^B	¾
	24-hour TSP	09:08 – 09:10	Once per day
6 March 2003	1-hour TSP	14:13 – 17:18	3 times/day
	24-hour TSP	09:08 – 09:06	Once per day
7 March 2003	1-hour TSP	16:17 – 19:23	3 times/day
	24-hour TSP	09:28 – 09:05	Once per day
8 March 2003	1-hour TSP	14:01 – 17:04	3 times/day
	24-hour TSP	09:24- 09:24	Once per day
9 March 2003	1-hour TSP	07:23 – 10:23	3 times/day
10 March 2003	1-hour TSP	10:52 – 13:56	3 times/day
	24-hour TSP	09:18 – 09:19	Once per day
11 March 2003	1-hour TSP	09:44 – 12:46	3 times/day
	24-hour TSP	09:25 – 09:25	Once per day
12 March 2003	1-hour TSP	09:43 – 12:43	3 times/day
	24-hour TSP	09:25 – 09:25	Once per day
13 March 2003	1-hour TSP	09:58 – 13:00	3 times/day
	24-hour TSP	09:31 – 09:30	Once per day
14 March 2003	1-hour TSP	09:51 – 17:10	5 times/day^C
	24-hour TSP	09:32 – 09:30	Once per day
15 March 2003	1-hour TSP	12:00 – 18:11	3 times/day

Notes: A – Baseline monitoring was partially suspended due to bad weather.

B – Baseline monitoring of 1-hour TSP was suspended due to rain.

C –Two additional 1-hour TSP measurements were performed to make up for monitoring which

Was suspended due to rain on 4 March 2003.

2.4 Monitoring Methodology

HVS Locations

2.4.1 The following criteria were considered in the installation of the HVS:

· a horizontal platform with appropriate support to secure the samplers against gusty wind was provided;

· no two HVS were placed less than 2 m apart;

· the distance between the HVS and any obstacles, such as buildings, was at least twice the height that the obstacle protrudes above the HVS;

· a minimum of 2 m separation from walls, parapets and penthouses was required for rooftop samplers;

· a minimum of 2 m separation from any supporting structure, measured horizontally;

· no furnace or incinerator flues were nearby;

· airflow around the sampler was unrestricted;

· any wire fence and gate, to protect the sampler did not cause any obstruction during monitoring;

· permission was obtained to set up the samplers and to obtain access to the monitoring stations; and

· a secured supply of electricity was provided to operate the samplers.

Field Measurements

2.4.2 At each monitoring location, 24-hour TSP measurements were undertaken using a HVS in accordance with the specifications listed in the EM&A Manual. Each HVS included a motor, a filter holder, a flow controller and a sampling inlet in accordance with the performance specification of the USEPA Standard Title 40, Code of Federation Regulations Chapter 1 (Part 50 Appendix B).

2.4.3 The following activities were undertaken during the HVS monitoring:

· The power supply was checked to ensure the HVS works properly;

· The filter holder and the area surrounding the filter were cleaned;

· The filter holder was removed by loosening the four bolts and a new filter on a supporting screen was aligned carefully;

· The filter was properly aligned on the screen so that the gasket formed an airtight seal on the outer edges of the filter;

· The swing bolts were fastened to hold the filter holder down to the frame. The pressure applied was sufficient to avoid air leakage at the edges;

· The shelter lid was closed and was secured with the aluminum strip;

· The HVS was warmed-up to establish run-temperature conditions;

· A new flowrate record sheet was set into the flow recorder;

· The programmable timer was set for a sampling period of 24 hrs + 1 hr, and the starting time, weather condition and the filter number were recorded;

· The initial elapsed time was recorded;

· At the end of sampling, the sampled filter was removed carefully and folded in half-length so that only surfaces with collected particulate matter were in contact;

· The sample was placed in a clean plastic envelope and sealed;

· All monitoring information was recorded on a standard data sheet; and

· The filters were taken back to laboratory for analysis.

2.4.4 A hand held dust meter was used for taking the 1-hour TSP measurements at each site.

2.5 Monitoring Equipment

2.5.1 The equipment used for the baseline monitoring is described in Table 2.3.

Table 2.3 - Equipment Used for Dust Monitoring

Parameter Measured	Equipment
24-Hour Sampling	A High Volume Sampler Model GS2310, by Anderson Instruments, was used for both monitoring stations. This instrument was equipped with: · An electronic mass flow controller with 20 – 60 SCFM adjustable flow range · A digital timer for recording elapsed-time and 24-hour operation · A continuous flow recorder for continuous monitoring
1-Hour Sampling	A MicroDust pro Aerosol Monitoring System was used for both monitoring locations. This portable instrument is capable of providing: · Real time TSP concentration · Adjustable logging intervals from 2 to 600 seconds · Average concentration over logging interval and maximum and average values for entire logging period

2.5.2 All monitoring equipment was checked and calibrated prior to use.

2.6 Laboratory Measurement/Analysis

2.6.1 The TSP samples were analysed at the ACL’s in-house Laboratory. The methodology and analysis at the laboratory was approved by the Engineer’s Representative (ER) in consultation with the IEC.

2.6.2 Clean filter paper with no folds or pin holes of size 8” x 10” were labelled before sampling. The filter paper were conditioned in a humidity-controlled chamber for over 24 hours and pre-weighed before used for sampling. After sampling, the filter paper containing the dust was kept tightly sealed in a plastic bag. The filter was then returned to the laboratory for reconditioning in a humidity-controlled chamber followed by accurate weighing by an electronic balance.

2.7 Baseline Monitoring Results

2.7.1 The weather during the monitoring period included a variety of conditions: cloudy, rain and sunny weather. 1-hour sampling at the PLA Headquarters station was suspended on the 4th of March 2003 due to rain showers, and was also suspended at both the PLA Headquarters and the City Hall sites on the 5th of March 2003 due to rain showers. Additional measurements were undertaken to make up for the days that sampling could not be undertaken.

2.7.2 The baseline monitoring results at the two monitoring locations are provided in full in Annex A. The summary of the baseline data at each monitoring location in terms of average and maximum value for 24-hour and 1-hour sampling are summarised in Table 2.4. Graphical representations of the 1-hour and 24-hour TSP sampling results are shown in Annex B.

Table 2.4 – Summary of Baseline Air Quality Monitoring Results

Station	City Hall Average TSP Concentration, mg/m^3	PLA Site Average TSP Concentration, mg/m^3
1-Hour TSP	324	280
24-Hour TSP	51	37

2.7.3 The average 1-hour TSP concentration measured at the City Hall monitoring station was 324 mg/m³. The average 24-hour TSP concentration at the City Hall monitoring station was 51.2 mg/m³.

2.7.4 For the PLA monitoring station, the average 1-hour TSP concentration was 280 mg/m³. The average 24-hour TSP level measured at the PLA monitoring station was 37.5 mg/ m³.

2.7.5 The 24-hour TSP levels at the City Hall station were consistently higher than the levels at the PLA site by >17% during the monitoring period except during the sampling on 14 March 2003.

2.8 Action and Limit Levels

2.8.1 The Action and Limit Levels for air quality were set in accordance with the EM&A Manual. The Action and Limit Levels for the City Hall and PLA monitoring stations are provided in Tables 2.5 and 2.6.

Table 2.5 - Air Quality Action and Limit Levels for the City Hall Monitoring Station

Parameter	Action Level	Limit Level
1-Hour TSP Level in mg/m^3	461^A	500
24-Hour TSP Level in mg/m^3	163^B	260

Notes: A - For Baseline Level £ 384 mg/m³, Action Level = (Baseline Level*1.3 + Limit Level)/2;

For Baseline Level > 384 mg/m³, Action Level = Limit Level

B - For Baseline Level £ 200 mg/m³, Action Level = (Baseline Level*1.3 + Limit Level)/2;

For Baseline Level > 200 mg/m³, Action Level = Limit Level

Table 2.6 – Air Quality Action and Limit Levels for the PLA Monitoring Station

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