Appendix B Action
and Limit Levels for Air Quality, Noise, Water Quality Monitoring
Table B.1 Action
and Limit Levels for 1-hour and 24-hour TSP
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Action Level, mg/m3 |
Limit Level, mg/m3 |
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1-hour TSP* |
340 |
500 |
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24-hour TSP |
190 |
260 |
T
No Action/Limit Level for 1-hour TSP is applied to AM4
where no real time dust monitor is installed.
B.2. Noise
Table B.2 presents
the Action and Limit (AL) levels for construction noise other than percussive
piling.
Table B.2 AL
Levels for
Construction Noise (Other than Percussive Piling)
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Parameters |
Action |
Limit |
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Noise Levels at the NSR's at Long Tsai Tsuen/Hung Shing Ye and school within the
village of Tai Wan San Tsuen predicted by the noise alarm monitoring system |
When one or more documented complaints are received |
a. 75 dB(A) in LAeq,30 min
(07:00-19:00 hrs on normal weekdays) (Note 1) b. subject to statutory control
under the Noise Control Ordinance (07:00-23:00
hrs on holidays and 19:00-23:00
hrs on all other days). Set to 60 dB(A) in LAeq,5 min c. subject to statutory control
under the Noise Control Ordinance (23:00-07:00
hrs of next day). Set to 45 dB(A) in LAeq,5 min |
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Manual noise monitoring at the nearest Pak Kok Tsui
residences to cable landing points N4 and N5 |
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Note: 1.
For educational
institution, the limit level shall be 70 dB(A), reduced to 65 dB(A) during
examination periods. |
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Table B.3a Field Measurement of Dissolved Oxygen (mg/L) (Revised on 1st October
2001) |
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(a) Surface and Middle – Dry Season (November – March) |
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SR1 |
SR2 |
SR4 |
SR5 |
SR6 |
SR7 |
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Action Level (5%-ile) |
4.8* |
4.7* |
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1%-ile |
3.9** |
4.5** |
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Limit Level |
4.0*** |
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Note: |
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1.
* - the figures 4.8 and 4.7 mg/L represent 5%-ile
of Marine Water Quality (MWQ) in Hong Kong from 1996 to 2000 |
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2.
** - the figures 3.9 and 4.5 mg/L represent 1%-ile
of MWQ in Hong Kong from 1996 to 2000 |
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3.
*** - the
WQO for DO in non-FCZ |
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(b)
Surface and Middle – Wet Season (April – October) |
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SR1 |
SR2 |
SR4 |
SR5 |
SR6 |
SR7 |
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Action Level (5%-ile) |
4.2* |
4.7* |
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1%-ile |
3.9** |
4.4** |
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Limit Level |
4.0*** |
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Note: |
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1.
* - the figures 4.2 and 4.7 mg/L represent 5%-ile
of MWQ in Hong Kong from 1996 to 2000 |
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2.
** - the figures 3.9 and 4.4 mg/L represent
1%-ile of MWQ in Hong Kong from 1996 to 2000 |
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3.
*** - the
WQO for DO in non-FCZ |
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(c) Bottom – Dry Season (November – March) |
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SR1 |
SR2 |
SR4 |
SR5 |
SR6 |
SR7 |
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Action Level (5%-ile) |
5.1* |
4.9* |
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1%-ile |
3.7** |
4.8** |
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Limit Level |
2.0*** |
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Note: |
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1. * - the figures 5.1 and 4.9 mg/L represent 5%-ile of MWQ in Hong Kong from 1996 to 2000 |
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2. ** - the figures 3.7 and 4.8 mg/L represent 1%-ile of MWQ in Hong Kong from 1996 to 2000 |
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3. *** - the WQO for DO in non-FCZ |
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(d) Bottom – Wet Season (April – October) |
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SR1 |
SR2 |
SR4 |
SR5 |
SR6 |
SR7 |
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Action Level (5%-ile) |
2.7* |
3.5* |
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1%-ile |
2.3** |
3.0** |
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Limit Level |
2.0*** |
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Note: |
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1. * - the figures 2.7 and 3.5 mg/L represent 5%-ile of MWQ in Hong Kong from 1996 to 2000 |
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2. ** - the figures 2.3 and 3.0 mg/L represent 1%-ile of MWQ in Hong Kong from 1996 to 2000 |
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3. *** - the WQO for DO in non-FCZ |
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Table B.3b
Turbidity (NTU) |
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(depth-average) |
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SR1 |
SR2 |
SR4 |
SR5 |
SR6 |
SR7 |
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Action Level (95%-ile) |
17.9 |
16.3 |
13.2 |
17.5 |
17.2 |
17.3 |
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Limit Level (99%-ile) |
22.8 |
19.0 |
13.6 |
18.3 |
17.9 |
21.5 |
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Note: |
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1. The Action Levels can be 95%-ile of baseline data as mentioned above or 120% of upstream control station at the same tide of the same day according to the EM&A Manual |
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2. The Limit Levels can be 99%-ile of baseline data as mentioned above or 130% of upstream control station at the same tide of the same day according to the EM&A Manual. 3. During ebb tide, the upstream control stations are C1, C2 and C3 while during flood tide, the upstream control stations are C4 and C5. |
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Table B.3c Suspended Solids (mg/L) |
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(depth-average) |
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SR1 |
SR2 |
SR3 |
SR4 |
SR5 |
SR6 |
SR7 |
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95%-ile |
16.8 |
15.3 |
13.8 |
17.6 |
17.5 |
16.9 |
17.5 |
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Action Level |
16.8 |
15.3 |
-- |
17.6 |
17.5 |
16.9 |
17.5 |
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99%-ile |
18.9 |
15.5 |
17.0 |
19.1 |
18.4 |
23.5 |
19.0 |
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Limit Level |
18.9 |
15.5 |
100.0 |
19.1 |
18.4 |
23.5 |
19.0 |
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Note: |
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1.
No Action Level is applied for SR3 according to the
EM&A Manual |
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2.
Limit Level of SR3 is 100 mg/L according to the
EM&A Manual |
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3.
The Action Levels can be 95%-ile of baseline data as
mentioned above or 120% of upstream control station at the same tide of the
same day according to the EM&A Manual |
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4.
The Limit Levels can be 99%-ile of baseline data as
mentioned above or 130% of upstream control station at the same tide of the
same day according to the EM&A Manual. 5.
During ebb tide, the upstream control stations are
C1, C2 and C3 while during flood tide, the upstream control stations are C4
and C5. |
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