Appendix C Action
and Limit Levels for Air Quality, Noise, Water Quality Monitoring
Table C.1 Action
and Limit Levels for 1-hour and 24-hour TSP
|
|
Action Level, mg/m3 |
Limit Level, mg/m3 |
|
1-hour TSP* |
340 |
500 |
|
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.
C.2. Noise
Table C.2 presents
the Action and Limit (AL) levels for construction noise other than percussive
piling.
Table C.2 AL
Levels for
Construction Noise (Other than Percussive Piling)
|
Parameters |
Action |
Limit |
|
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 |
|
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 C.3 Action
and Limit Levels for Water Quality
|
Table C.3a Field Measurement of Dissolved Oxygen (mg/L) |
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(a) Surface and Middle |
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SR1 |
SR2 |
SR4 |
SR5 |
SR6 |
SR7 |
|
Action Level (5%-ile) |
6.0 |
6.0 |
6.1 |
6.0 |
6.0 |
6.0 |
|
1%-ile |
6.0 |
6.0 |
6.0 |
6.0 |
5.8 |
5.7 |
|
Limit Level |
4.0 |
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Note: |
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|
1.
All impact
monitoring stations were considered to be non-FCZ stations |
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2.
Since the
calculated 1%-ile results are larger than 4.0 mg/L, therefore the Limit
Levels are proposed to be 4.0 mg/L according to the EM&A Manual |
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(b) Bottom |
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|
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|
|
|
SR1 |
SR2 |
SR4 |
SR5 |
SR6 |
SR7 |
|
Action Level (5%-ile) |
5.9 |
6.0 |
6.1 |
6.1 |
6.1 |
6.1 |
|
1%-ile |
5.9 |
5.9 |
5.9 |
5.9 |
5.7 |
5.7 |
|
Limit Level |
2.0 |
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|
Note: |
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|
|
|
|
|
|
1. Since the calculated 1%-ile results are larger than 2.0 mg/L, therefore the Limit Levels are proposed to be 2.0 mg/L according to the EM&A Manual |
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Table C.3b
Turbidity (NTU) |
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(depth-average) |
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|
|
|
|
SR1 |
SR2 |
SR4 |
SR5 |
SR6 |
SR7 |
|
Action Level (95%-ile) |
17.9 |
16.3 |
13.2 |
17.5 |
17.2 |
17.3 |
|
Limit Level (99%-ile) |
22.8 |
19.0 |
13.6 |
18.3 |
17.9 |
21.5 |
|
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 C.3c Suspended Solids (mg/L) |
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(depth-average) |
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|
|
|
SR1 |
SR2 |
SR3 |
SR4 |
SR5 |
SR6 |
SR7 |
|
95%-ile |
16.8 |
15.3 |
13.8 |
17.6 |
17.5 |
16.9 |
17.5 |
|
Action Level |
16.8 |
15.3 |
-- |
17.6 |
17.5 |
16.9 |
17.5 |
|
99%-ile |
18.9 |
15.5 |
17.0 |
19.1 |
18.4 |
23.5 |
19.0 |
|
Limit Level |
18.9 |
15.5 |
100.0 |
19.1 |
18.4 |
23.5 |
19.0 |
|
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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Table C.3d Unionized Ammonia (mg/L) |
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(depth-average) |
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|
|
|
SR1 |
SR2 |
SR4 |
SR5 |
SR6 |
SR7 |
|
Action Level (95%-ile) |
0.006 |
0.005 |
0.003 |
0.001 |
0.001 |
0.001 |
|
99%-ile |
0.007 |
0.005 |
0.003 |
0.002 |
0.001 |
0.003 |
|
Limit Level |
0.021 |
0.021 |
0.021 |
0.021 |
0.021 |
0.021 |
|
Note: |
|
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|
1.
Since the calculated 99%-ile results are smaller than
0.021 mg/L, therefore the Limit Levels are proposed to be 0.021 mg/L
according to the EM&A Manual. |
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Table C.3e Total Inorganic Nitrogen (mg/L) |
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(depth-average) |
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|
|
|
|
|
SR1 |
SR2 |
SR4 |
SR5 |
SR6 |
SR7 |
|
Action Level (95%-ile) |
0.25 |
0.23 |
0.11 |
0.11 |
0.11 |
0.12 |
|
99%-ile |
0.27 |
0.25 |
0.12 |
0.11 |
0.11 |
0.13 |
|
Limit Level |
0.40 |
0.25 |
0.12 |
0.11 |
0.11 |
0.13 |
|
Note: |
|
|
|
|
|
|
|
1.
Since the calculated 99%-ile results for SR2 to SR7
are larger than 0.1 mg/L, therefore the Limit Levels for SR2 to SR7 are
proposed to be the calculated 99%-ile data according to the EM&A Manual. |
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|
2.
Since the calculated 99%-ile result for SR1 is
smaller than 0.4 mg/L, therefore the Limit Level for SR1 is proposed to be
0.4 mg/L according to the EM&A Manual. |
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