3.        NOISE

Monitoring Requirements

3.1              Noise monitoring was conducted in accordance with the Updated EM&A Manuals. Appendix A shows the established Action and Limit Levels for the environmental monitoring works.

Monitoring Locations

3.2              Noise monitoring was conducted at three designated monitoring stations, namely N1, N2 and N3, as summarized in Table 3.1.   Figure 3.1 shows the locations of these stations. 

 

Table 3.1     Noise Monitoring Stations

Monitoring Stations

Description

N1

At ground level of Village house at No.49-50, Shung Ching San Tsuen

N2

At ground level of Village house at No.17 Chuk San Tsuen

N3

On roof of Small Traders New Village Public School besides the Pok Oi Hospital

Monitoring Equipment

3.3              Integrating Sound Level Meters were used for noise monitoring.  They were Type 1 sound level meters capable of giving a continuous readout of the noise level readings including equivalent continuous sound pressure level (Leq) and percentile sound pressure level (Lx).  They comply with International Electrotechnical Commission Publications 651:1979 (Type 1) and 804:1985 (Type 1).

3.4              Table 3.2 summarizes the noise monitoring equipment model being used. Calibrations of equipments are conducted annually. Copies of renewed calibration certificates for the reporting month are attached in Appendix B.

 

Table 3.2     Noise Monitoring Equipment

Equipment

Model and Make

Qty.

Integrating Sound

Level Meter

B&K Model 2238

4

Rion NL14

1

Calibrator

B&K 4231

2

Wind Speed Anemometer

Vane Anemometer, Model 451104

1

 

 

 

 

Monitoring Parameters, Frequency and Duration

3.5              Table 3.3 summarizes the monitoring parameters, frequency and total duration of monitoring. The noise monitoring schedule is shown in Appendix C.

Table 3.3     Noise Monitoring Parameters, Frequency and Duration

Monitoring Stations

Parameter

Period

Frequency

Measurement

N1

L10(30 min.)dB(A)

L90(30 min.)dB(A)

Leq(30 min.)dB(A)

0700-1900  on normal weekdays

Once per     week

Free field + 3dB correction

N2

Free field + 3dB correction

N3

Facade

Monitoring Methodology and QA/QC Procedures

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

Maintenance and Calibration

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

Results and Observations

3.8              Noise monitoring was performed at the designated locations during the daytime period (0700 to 1900) as scheduled in the reporting month. Results and graphical presentations are shown in Appendix F.

3.9              The weather during the monitoring sessions was mainly sunny. Weather conditions are provided in Appendix F.

3.10          Construction noise monitoring was conducted as scheduled except the monitoring at all Stations on 3 August 06 due to hosting of Typhoon Signal No. 3 as well as at Station B on 9 and 17 August 06 when the school was closed for summer holiday. No Action/Limit Level exceedance was recorded in the reporting month.