Appendix C Environmental Action and Limit Levels
Action and Limit
Levels for 24-hour TSP
|
Monitoring Station |
Action Level (mg/m3) |
Limit Level (mg/m3) |
|
AM1 |
177.4 |
260 |
|
AM2 |
205.0 |
260 |
Action and Limit
Levels for 1-hour TSP
|
Monitoring Station |
Action Level (mg/m3) |
Limit Level (mg/m3) |
|
AM1 |
311.2 |
500 |
|
AM2 |
368.6 |
500 |
Action and Limit
Levels (Leq) for Construction Noise
|
Time Period |
Action Level |
Limit Level |
||
|
NMC1 |
NMC2 |
NMC3 |
||
|
0700 –
1900 hours on normal weekdays |
When
one documented complaint is received from any one of the sensitive receivers |
75 |
70/65* |
70/65* |
|
0700 –
2300 hours on public holidays including Sundays and 1900 –
2300 hours on all days |
Subject
to requirements stipulated in future Construction Noise Permits |
|||
|
2300 –
0700 on all days |
||||
*reduce to 70dB(A) for schools and 65dB(A) during
school examination periods
Action and Limit Levels
for Water Quality
|
Parameters |
Action |
Limit |
|
DO in mg/L (Surface & Middle,
Bottom) |
Surface & Middle 5.4 mg/L Bottom 5.2 mg/L |
Surface & Middle 4.0 mg/L Bottom 2.0 mg/L |
|
SS in mg/L (depth-averaged) |
17.7 mg/L
and 120% of upstream control station's SS at the same tide of the same day |
20.5 mg/L and 130% of upstream control station's SS at
the same tide of the same day |
|
Turbidity in NTU (depth-averaged) |
9.6 NTU
and 120% of upstream control station's Turbidity at the same tide of the same
day |
10.8 NTU and 130% of upstream control station's
Turbidity at the same tide of the same day |
Notes: 1. "depth-averaged"
is calculated by taking the arithmetic means of reading of all three depths.
2. For DO,
non-compliance of the water quality limits occurs when monitoring result is
lower than the limits.
3. For
turbidity and SS, non-compliance of the water quality limits occurs when
monitoring result is higher than the limits.
4. All the figures given in the table are used for reference only and
the EPD may amend the figures whenever it is considered as necessary.