2. AIR QUALITY

Monitoring Requirements

2.1 1-hour and 24-hour TSP monitoring was conducted to monitor the air quality. Appendix A shows the established Action/Limit Levels for the environmental monitoring works.

Monitoring Locations

2.2 Three designated monitoring stations, A, B and C were selected for impact dust monitoring. Table 2.1 describes the air quality monitoring locations. Figure 2.1 shows the locations of these stations.

Table 2.1 Locations for Air Quality Monitoring Station

Monitoring Stations	Description
A	Village house at No. 60, Kong Tau Tsuen
B	Small Traders New Village Public School Yuen Long
C	豪州嶺1號

Monitoring Equipment

2.3 Table 2.2 summarizes the equipment used in the impact air monitoring programme. Calibrations of equipments are conducted once per two months. Copies of renewed calibration certificates for the reporting month are attached in Appendix B.

Table 2.2 Air Quality Monitoring Equipment

Equipment

Model and Make

Qty.

HVS Sampler

Graseby GMW Model GS2310 High Volume

TSP Sampler and associated equipment and shelter in

accordance with the USA standard Title 40, code of Federal regulations, Chapter 1 (part 50), Appendix B

Calibrator

GMW 25

Monitoring Parameters, Frequency and Duration

2.4 Table 2.3 summarizes the monitoring parameters and frequencies of impact dust monitoring for the whole construction period. The air quality monitoring schedule for this reporting period is shown in Appendix C.

Table 2.3 Impact Dust Monitoring Parameters, Frequencies and Durations

Parameters	Frequency
1-hour TSP	Three times / 6 days
24-hour TSP	Once / 6 days

Monitoring Methodology and QA/QC Procedures

1-hour and 24-hour TSP Monitoring

Instrumentation

2.5 High volume samplers (HVS) (Model GMWS-2310 Accu-Vol) completed with appropriate sampling inlets was employed for 24-hour TSP monitoring. The sampler was composed of a motor, a filter holder, a flow controller and a sampling inlet and its performance specification complied with that required by USEPA Standard Title 40, Code of Federation Regulations Chapter 1 (Part 50) Appendix B. Moreover, the HVS also met all the requirements in section 2.3 of the EM&A Manual.

Operating/Analytical Procedures

2.6 The details of operating/analytical procedures for dust monitoring are described in the previous EM&A Monthly reports.

Maintenance/Calibration

2.7 The details of requirements of maintenance/calibration are described in the previous EM&A Monthly reports.

Results and Observations

2.8 Dust monitoring was conducted as scheduled in the reporting period. The monitoring data and graphical presentations of 1-hour and 24-hour TSP monitoring results are shown in Appendices D and E respectively.

2.9 A wind data monitoring equipment was installed at monitoring station B for logging wind speeds and wind directions. The wind data for the reporting month are summarized in Appendix G.

2.10 The weather during the monitoring session was mainly sunny or cloudy. Weather conditions on the monitoring days are provided in Appendices D and E.

1-hour TSP Monitoring

2.11 The 1-hour TSP monitoring was conducted as scheduled except the monitoring at Station B on 1, 4, 7, 9, 14, 15 and 17 August 2006. The Station B was not accessible to the monitoring team during the summer holiday of the school which was closed in these days. No Action/Limit Level exceedance was recorded in the reporting month.

24-hour TSP Monitoring

2.12 The 24-hour TSP monitoring was conducted as scheduled except the monitoring at Station B on 2 and 8 August 06. The Station B was not accessible to the monitoring team during the summer holiday of the school which was closed in these days. No Action/Limit Level exceedance was recorded in the reporting month.