Appendix
5.1 Background
Noise Survey
1. Location
1.1 The noise survey for the existing background noise was carried out at the Area 44, Tuen Mun. The measurement locations are shown in the Figure 1.
2. Date
and Time
2.1 The noise survey was carried out on 22 Nov. 2000 between 03:28 to 04:43 hours.
3. Personnel
3.1 Mr. Gary Yim (Scientific Officer)
Mr. Vincent Pow (Scientific Officer)
4. Instrumentation
4.1 Type 1 sound level meter, SLM (Rion NA27) and Calibrator (Rion NC73) were used to perform the noise survey.
5. Weather
Conditions
5.1 The sky was clear and with light wind during the noise survey period.
6. Survey
Procedure
6.1 The SLM was placed at a height of 1.2m above ground surface. The SLM was positioned at 1 m away from building façade where applicable.
6.2 The SLM was calibrated immediately prior to and after noise measurements.
6.3 Noise measurement was conducted for three locations. The Leq(15min), L10 and L90 were recorded during the survey.
6.4 The background noise survey record sheet is attached.
7. Noise
Survey Result
7.1 The background noise levels recorded during the survey are shown below.
The background noise survey results:
|
Location |
Time
Period |
Noise
Level, dB(A) |
||
|
Leq |
L10 |
L90 |
||
|
BG1 |
0328
- 0343 |
62.3 |
61.6 |
48.6 |
|
BG2 |
0357
- 0412 |
57.2 |
58.8 |
47.9 |
|
BG3 |
0428 - 0443 |
56.8 |
57.0 |
45.9 |
Noise Measurement Data Sheet
Sheet 1 of 1
|
Monitoring Location |
Area
44, Tuen Mun |
|
||||||
|
Weather |
Light
wind |
|||||||
|
Date of Monitoring |
22
November 2000 |
|||||||
|
Personnel |
Gary Yim & Vincent Pow |
|||||||
|
Time (hh:mm) |
0328
- 0443 |
|||||||
|
Calibrated Level |
Before |
94.0
dB(A) |
||||||
|
After |
94.0
dB(A) |
|||||||
|
Sound Level Meter (Model, S/N) |
RION
NA-27 S/N:
01070547 |
|||||||
|
Calibrator (Model, S/N) |
RION
NC-73 S/N:
10186489 |
|||||||
|
Measurements Results |
||||||||
|
Location
ID |
Time
Period |
Noise
Levels (dBA) |
Remarks |
|||||
|
Leq,dB(A) |
L10, dB(A) |
L90, dB(A) |
||||||
|
BG1 |
0328
- 0343 |
62.3 |
61.6 |
48.6 |
|
|||
|
BG2 |
0357
- 0412 |
57.2 |
58.8 |
47.9 |
|
|||
|
BG3 |
0428 - 0443 |
56.8 |
57.0 |
45.9 |
|
|||
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|||
|
|
Allied Environmental Consultants Ltd
Acousticians &
Environmental
Engineers
No. 10, 40/F., Jardine House, 1 Connaught Place, Central,
Hong Kong.
Tel : (852) 2815 7028 Fax: (852) 2815 5399 e-mail: aecl@netvigator.com