APPENDIX B – Action and
Limit Levels
Air
Quality
1-hr TSP
|
Monitoring
Stations |
Location |
Action
Level, μg/m3 |
Limit Level, μg/m3 |
|
AM1 |
Tin Hau Temple |
275 |
500 |
|
AM2 |
Sai Tso Wan Recreation Ground |
273 |
|
|
AM3 |
Yau Lai Estate Bik Lai House |
271 |
|
|
AM4 |
Sitting-out Area at Cha Kwo
Ling Village |
278 |
|
|
AM5(A) |
Tseung
Kwan O DSD Desilting Compound |
273 |
|
|
AM6(A) |
Park
Central, L1/F Open Space Area |
285 |
24-hr TSP
|
Monitoring
Stations |
Location |
Action
Level, μg/m3 |
Limit Level, μg/m3 |
|
AM1 |
Tin Hau Temple |
173 |
260 |
|
AM2 |
Sai Tso Wan Recreation Ground |
192 |
|
|
AM3 |
Yau Lai Estate Bik Lai House |
167 |
|
|
AM4(A) |
Cha Kwo Ling
Public Cargo Working Area Administrative Office |
210 |
|
|
AM5(A) |
Tseung
Kwan O DSD Desilting Compound |
175 |
|
|
AM6(A) |
Park
Central, L1/F Open Space Area |
165 |
Noise
|
Time Period |
Action Level |
Limit Level |
|
0700-1900 hrs on normal
weekdays |
When one
documented complaint is received from any one of
the monitoring stations |
75 dB(A) (1) |
|
1900-2300
on all days and 0700-2300 on general holidays (including Sundays) |
60/65/70 dB(A)(2)(3) |
|
|
2300-0700
on all days |
45/50/55 dB(A)(2)(3) |
1 70
dB(A) for schools and 65 dB(A) for schools during examination period.
2 Acceptable
Noise Levels for Area Sensitivity Rating of A/B/C
3 If works are to be carried out during
restricted hours, the conditions stipulated in the construction noise permit
issued by the Noise Control Authority have to be followed.
Water Quality
Groundwater
|
Parameters |
Action |
Limit |
|
DO in mg L-1 |
7.6 |
7.6 |
|
pH |
6.0 – 8.9 |
6.0 – 9.0 |
|
BOD5
in mg L-1 |
2.0 |
2.0 |
|
TOC in mg L-1 |
Stream 1
and Stream 2: 9 |
Stream 1
and Stream 2: 9 |
|
Stream 3: 6 |
Stream 3: 6 |
|
|
Total
Nitrogen in mg L-1 |
2.0 |
2.1 |
|
Ammonia-N in
mg L-1 |
0.15 |
0.20 |
|
Total
Phosphate in mg L-1 |
0.05 |
0.05 |
|
SS in mg L-1 |
7.6 |
12.1 |
|
Turbidity in
NTU |
2.1 |
2.3 |
Notes:
1. For DO, non-compliance of the water quality limits occurs when monitoring result is lower than the limits.
2. For turbidity, SS, 5-day biochemical oxygen demand (BOD5), Total organic carbon (TOC), Total Nitrogen, Ammonia-N and Total Phosphate, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.
3. 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.
Groundwater Level Monitoring
|
Drill Hole No. |
38568-LDH1 |
TKO-LBH907 |
|
Action Level (mPD) |
+74.65 |
+17.59 |
Marine Water Quality
|
Parameter
(unit) |
Depth |
Action
Level |
Limit
Level |
|
DO in mg/L (See Note 1 and 4) |
Stations
G1-G4, M1-M5 |
||
|
Depth Average |
4.9
mg/L |
4.6
mg/L |
|
|
Bottom |
4.2
mg/L |
3.6
mg/L |
|
|
Station
M6 |
|||
|
Intake Level |
5.0
mg/L |
4.7
mg/L |
|
|
Turbidity in
NTU (See
Note 2 and 4) |
Stations
G1-G4, M1-M5 |
||
|
Bottom |
19.3
NTU or 120% of upstream control station's
Turbidity at the same tide of the same day |
22.2
NTU or 130% of upstream control station's
Turbidity at the same tide of the same day |
|
|
Station
M6 |
|||
|
Intake Level |
19.0
NTU |
19.4
NTU |
|
|
SS in mg/L (See
Note 2 and 4) |
Stations
G1-G4 |
||
|
Surface |
6.0
mg/L or 120% of
upstream control station's SS at the same tide of the same day |
6.9mg/L or 130% of
upstream control station's SS at the same tide of the same day |
|
|
Stations
M1-M5 |
|||
|
Surface |
6.2
mg/L or 120% of
upstream control station's SS at the same tide of the same day |
7.4
mg/L or 130% of
upstream control station's SS at the same tide of the same day |
|
|
Stations
G1-G4, M1-M5 |
|||
|
Bottom |
6.9
mg/L or 120% of
upstream control station's SS at the same tide of the same day |
7.9
mg/L or 130% of
upstream control station's SS at the same tide of the same day |
|
|
Station
M6 |
|||
|
Intake Level |
8.3
mg/L |
8.6
mg/L |
|
Notes:
1. For DO, non-compliance of the water quality limits occurs when
monitoring result is lower than the limits.
2. For turbidity, SS, non-compliance of the water quality limits occurs
when monitoring result is higher than the limits.
3. All the figures given in the table are used for reference only and
EPD may amend the figures whenever it is considered as necessary.
4. Action and limit values are derived based on baseline water quality
monitoring results to show the actual baseline water quality condition.
Ecology
Post-translocation Coral Monitoring
|
Parameter |
Action
Level Definition |
Limit
Level Definition |
|
Mortality |
If during Impact Monitoring a 15% increase in the percentage of
partial mortality on hard corals occurs at more than 20% of the tagged coral
at any one Impact Monitoring Site that is not recorded at the Control Site,
then the Action Level is exceeded. |
If during the Impact Monitoring a 25% increase in the percentage
of partial mortality occurs at more than 20% of the tagged coral at any one
Impact Monitoring Site that is not recorded at the Control Site, then the
Limit Level is exceeded. |
Landfill Gas Monitoring
|
Parameter |
Limit Level |
|
Oxygen |
<19% |
|
<18% |
|
|
Methane |
>10% LEL (i.e. > 0.5% by volume) |
|
>20% LEL
(i.e. > 1% by volume) |
|
|
Carbon Dioxide |
>0.5% |
|
>1.5% |