With reference to Clause 3.4.1.2(ii) of the EIA Study Brief for the above project, existing noise levels are required for determining the planning standards. In this regard, HEC has conducted a noise measurement in end May 2004. The details and results of the noise measurement are given below.
Measurement was
conducted continuously for 2 days from 25/05/2004 noon to 27/05/2004 noon.
Measurement was taken at a free field position 1.2 m above ground in the vicinity of No.1 Tai Ling Tsuen, i.e. the NSR nearest to the above project (see Figure B1).
The measurement
instrument used is “B&K 2238F sound level meter” which complies with IEC
60651 & 60804 Type 1 standard.
Immediately prior to and after the noise measurement, the sound level
meter was checked with “Rion NC-74 sound calibrator” which complies with IEC
60942 Class 1 standard. The
calibration levels before and after the noise measurement agree to within
1.0dB.
The noise
measurement was made in terms of 96 consecutive 30-min LAeq values. Typical statistical data (LA10 and LA90) for each 30-min
interval were also obtained for reference.
The weather was generally fine and calm throughout the measurement period. The local wind speed near the microphone position was continuously monitored with an ultrasonic wind sensor and was found to be lower than 1 ms-1 most of the time although it was occasionally measured up to 4 ms-1.
The measurement
results are summarized in Table B1.1 and details are given in Table
B1.2.
Table B 1.1 Overall Measured Prevailing Noise Level
|
Period |
|
LAeq, 30min |
|
|
|
Minimum |
Average |
Maximum |
|
0700 – 2300 hours |
46.8 |
62.8 |
78.9 |
|
2300 – 0700 hours |
44.6 |
57.8 |
79.5 |
Table B1.2 Measurement
Results
|
Date |
Start
time |
End
time |
LAeq |
LA10 |
LA90 |
|
25-May-04 |
12:00 |
12:30 |
57.1 |
60.5 |
45.8 |
|
25-May-04 |
12:30 |
13:00 |
64.0 |
67.5 |
51.7 |
|
25-May-04 |
13:00 |
13:30 |
64.6 |
67.9 |
46.1 |
|
25-May-04 |
13:30 |
14:00 |
64.4 |
68.3 |
48.5 |
|
25-May-04 |
14:00 |
14:30 |
64.4 |
68.3 |
50.0 |
|
25-May-04 |
14:30 |
15:00 |
64.2 |
68.3 |
52.1 |
|
25-May-04 |
15:00 |
15:30 |
65.3 |
69.9 |
51.5 |
|
25-May-04 |
15:30 |
16:00 |
65.8 |
67.0 |
50.2 |
|
25-May-04 |
16:00 |
16:30 |
65.2 |
70.7 |
48.4 |
|
25-May-04 |
16:30 |
17:00 |
56.4 |
58.6 |
47.4 |
|
25-May-04 |
17:00 |
17:30 |
51.4 |
52.6 |
44.7 |
|
25-May-04 |
17:30 |
18:00 |
53.2 |
53.6 |
42.2 |
|
25-May-04 |
18:00 |
18:30 |
56.5 |
56.8 |
40.9 |
|
25-May-04 |
18:30 |
19:00 |
57.6 |
64.3 |
41.0 |
|
25-May-04 |
19:00 |
19:30 |
54.3 |
55.4 |
41.6 |
|
25-May-04 |
19:30 |
20:00 |
48.4 |
52.0 |
42.8 |
|
25-May-04 |
20:00 |
20:30 |
48.5 |
51.4 |
46.2 |
|
25-May-04 |
20:30 |
21:00 |
49.6 |
50.6 |
46.0 |
|
25-May-04 |
21:00 |
21:30 |
47.2 |
48.6 |
45.8 |
|
25-May-04 |
21:30 |
22:00 |
47.7 |
49.6 |
46.1 |
|
25-May-04 |
22:00 |
22:30 |
46.8 |
48.0 |
44.9 |
|
25-May-04 |
22:30 |
23:00 |
49.0 |
52.9 |
44.6 |
|
25-May-04 |
23:00 |
23:30 |
49.7 |
54.3 |
44.6 |
|
25-May-04 |
23:30 |
24:00 |
48.1 |
53.1 |
43.5 |
|
26-May-04 |
00:00 |
00:30 |
51.0 |
55.4 |
44.1 |
|
26-May-04 |
00:30 |
01:00 |
51.7 |
57.2 |
43.2 |
|
26-May-04 |
01:00 |
01:30 |
49.8 |
56.2 |
42.6 |
|
26-May-04 |
01:30 |
02:00 |
44.6 |
46.3 |
41.9 |
|
26-May-04 |
02:00 |
02:30 |
45.1 |
45.8 |
43.1 |
|
26-May-04 |
02:30 |
03:00 |
55.0 |
56.9 |
44.3 |
|
26-May-04 |
03:00 |
03:30 |
56.3 |
57.8 |
45.9 |
|
26-May-04 |
03:30 |
04:00 |
56.8 |
57.8 |
56.1 |
|
26-May-04 |
04:00 |
04:30 |
56.5 |
57.0 |
56.0 |
|
26-May-04 |
04:30 |
05:00 |
56.8 |
57.7 |
56.1 |
|
26-May-04 |
05:00 |
05:30 |
61.9 |
62.6 |
56.1 |
|
26-May-04 |
05:30 |
06:00 |
71.2 |
74.1 |
63.3 |
|
26-May-04 |
06:00 |
06:30 |
75.2 |
77.8 |
70.7 |
|
26-May-04 |
06:30 |
07:00 |
78.2 |
80.0 |
75.7 |
|
26-May-04 |
07:00 |
07:30 |
78.4 |
80.3 |
76.0 |
|
26-May-04 |
07:30 |
08:00 |
77.3 |
79.5 |
74.9 |
|
26-May-04 |
08:00 |
08:30 |
76.7 |
78.7 |
74.2 |
|
26-May-04 |
08:30 |
09:00 |
74.5 |
76.9 |
70.9 |
|
26-May-04 |
09:00 |
09:30 |
72.5 |
75.8 |
66.7 |
|
26-May-04 |
09:30 |
10:00 |
74.4 |
77.7 |
63.0 |
|
26-May-04 |
10:00 |
10:30 |
63.8 |
68.1 |
44.1 |
|
26-May-04 |
10:30 |
11:00 |
68.9 |
71.6 |
45.2 |
|
26-May-04 |
11:00 |
11:30 |
70.0 |
74.0 |
51.1 |
|
26-May-04 |
11:30 |
12:00 |
69.0 |
74.1 |
46.4 |
|
26-May-04 |
12:00 |
12:30 |
53.0 |
55.8 |
41.9 |
|
26-May-04 |
12:30 |
13:00 |
69.9 |
75.4 |
46.9 |
|
26-May-04 |
13:00 |
13:30 |
67.6 |
71.9 |
47.7 |
|
26-May-04 |
13:30 |
14:00 |
68.7 |
72.2 |
55.5 |
|
26-May-04 |
14:00 |
14:30 |
63.1 |
66.3 |
44.1 |
|
26-May-04 |
14:30 |
15:00 |
64.7 |
70.3 |
45.6 |
|
26-May-04 |
15:00 |
15:30 |
66.7 |
71.0 |
54.4 |
|
26-May-04 |
15:30 |
16:00 |
69.4 |
69.1 |
46.6 |
|
26-May-04 |
16:00 |
16:30 |
67.9 |
70.1 |
54.2 |
|
26-May-04 |
16:30 |
17:00 |
57.3 |
59.0 |
45.6 |
|
26-May-04 |
17:00 |
17:30 |
65.5 |
59.1 |
45.5 |
|
26-May-04 |
17:30 |
18:00 |
55.8 |
51.8 |
44.1 |
|
26-May-04 |
18:00 |
18:30 |
64.0 |
65.1 |
43.6 |
|
26-May-04 |
18:30 |
19:00 |
65.6 |
67.4 |
43.7 |
|
26-May-04 |
19:00 |
19:30 |
55.8 |
54.7 |
43.2 |
|
26-May-04 |
19:30 |
20:00 |
53.8 |
55.5 |
47.0 |
|
26-May-04 |
20:00 |
20:30 |
52.5 |
54.9 |
48.1 |
|
26-May-04 |
20:30 |
21:00 |
52.4 |
55.4 |
48.2 |
|
26-May-04 |
21:00 |
21:30 |
52.8 |
55.6 |
48.2 |
|
26-May-04 |
21:30 |
22:00 |
51.0 |
55.2 |
47.2 |
|
26-May-04 |
22:00 |
22:30 |
47.7 |
48.6 |
46.3 |
|
26-May-04 |
22:30 |
23:00 |
48.3 |
48.8 |
46.3 |
|
26-May-04 |
23:00 |
23:30 |
48.7 |
48.9 |
46.1 |
|
26-May-04 |
23:30 |
24:00 |
52.3 |
55.4 |
46.1 |
|
27-May-04 |
00:00 |
00:30 |
52.7 |
54.9 |
46.2 |
|
27-May-04 |
00:30 |
01:00 |
53.7 |
54.8 |
53.0 |
|
27-May-04 |
01:00 |
01:30 |
53.0 |
54.0 |
47.3 |
|
27-May-04 |
01:30 |
02:00 |
53.2 |
54.4 |
49.0 |
|
27-May-04 |
02:00 |
02:30 |
53.8 |
54.8 |
53.0 |
|
27-May-04 |
02:30 |
03:00 |
53.4 |
54.8 |
46.6 |
|
27-May-04 |
03:00 |
03:30 |
54.4 |
55.7 |
52.0 |
|
27-May-04 |
03:30 |
04:00 |
55.3 |
56.8 |
51.4 |
|
27-May-04 |
04:00 |
04:30 |
55.3 |
55.9 |
54.4 |
|
27-May-04 |
04:30 |
05:00 |
54.3 |
55.8 |
47.8 |
|
27-May-04 |
05:00 |
05:30 |
70.0 |
75.6 |
47.5 |
|
27-May-04 |
05:30 |
06:00 |
75.4 |
77.5 |
72.1 |
|
27-May-04 |
06:00 |
06:30 |
77.4 |
79.8 |
74.1 |
|
27-May-04 |
06:30 |
07:00 |
79.5 |
81.5 |
77.1 |
|
27-May-04 |
07:00 |
07:30 |
78.9 |
80.7 |
76.5 |
|
27-May-04 |
07:30 |
08:00 |
78.2 |
80.1 |
75.5 |
|
27-May-04 |
08:00 |
08:30 |
78.3 |
80.6 |
74.9 |
|
27-May-04 |
08:30 |
09:00 |
76.6 |
79.6 |
71.0 |
|
27-May-04 |
09:00 |
09:30 |
76.1 |
80.3 |
64.6 |
|
27-May-04 |
09:30 |
10:00 |
71.3 |
73.7 |
59.7 |
|
27-May-04 |
10:00 |
10:30 |
67.1 |
70.9 |
49.4 |
|
27-May-04 |
10:30 |
11:00 |
73.3 |
77.5 |
59.0 |
|
27-May-04 |
11:00 |
11:30 |
70.4 |
75.3 |
51.7 |
|
27-May-04 |
11:30 |
12:00 |
66.2 |
70.0 |
54.7 |