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.