Noise survey for
material hoists operation
1. Location
1.1 The noise survey for material hoists operation was carried out in the existing temporary Wholesale Fish Market at Sam Shing Estate.
2. Date
and Time
2.1 The noise survey was carried out on 19 Jan. 2001 between 13:00 to 14:00.
3. Personnel
3.1 Mr. Gary Yim (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 weather condition was fine and sunny, at temperature 24oC.
6. Survey
Procedure
6.1 The SLM was placed at a height of 1.2m above ground surface. The SLM was positioned at a place with no sound reflecting objects in its vicinity. The dormant noise emission is from the electrical driven hydraulics pump.
6.2 The SLM was positioned at 3 sides of the material hoist, at a distance 1m away the material hoists (see noise survey record sheets attached).
6.3 The SLM was calibrated immediately prior to and following each noise measurement.
6.4 Four sets of result were collected during the noise survey period. The noise equivalent level (Leq) were recorded and converted to the sound power level using the following equation:
Leq = Lw - 20log r – 8
where:
Leq
is the equivalent sound pressure level, dB reference to 2 x 10-5Pa
Lw
is the sound power level of the source, dB(A)
r is
the slant distance between noise source and the receiver (m)
6.5 The noise survey record sheets are attached.
7. Noise
Survey Result
7.1 The noise survey results are detailed in the noise survey record sheets attached.
Noise Measurement Data Sheet
Sheet__1_ of __1__
|
Material Hoist Hydraulic pump Measurement Location |
Existing Temporary Wholesale Fish Market at
Sam Shing Estate |
|
|||||||
|
1m |
Sunny |
||||||||
|
1m 1 |
19.1.01 |
||||||||
|
Investigators |
Gary Yim |
||||||||
|
1m 3 |
1300-1400 |
||||||||
|
2 |
Before |
94.0 dB(A) |
|||||||
|
After |
94.2 dB(A) |
||||||||
|
Sea (Model, S/N) |
Rion NA 27 S/N.: 01070547 |
||||||||
|
Hoist
ID 5 4 3 2 1 (Model, S/N) |
Rion NC 73 S/N.: 10186489 |
||||||||
|
Measurements Results |
|||||||||
|
Hoist ID. |
Location of Measurement |
Time Period |
Noise Levels Leq 15s,
dB(A) |
||||||
|
Background |
- |
15s |
58.7 |
||||||
|
1 |
1 |
15s |
69.5 |
||||||
|
1 |
2 |
15s |
71.3 |
||||||
|
1 |
3 |
15s |
63.6 |
||||||
|
2 |
1 |
15s |
62.0 |
||||||
|
2 |
2 |
15s |
60.8 |
||||||
|
2 |
3 |
15s |
60.5 |
||||||
|
3 |
1 |
15s |
65.5 |
||||||
|
3 |
2 |
15s |
64.9 |
||||||
|
3 |
3 |
15s |
65.9 |
||||||
|
4 |
1 |
15s |
75.8 |
||||||
|
4 |
2 |
15s |
78.9 |
||||||
|
4 |
3 |
15s |
73.0 |
||||||
