Appendix
B
- Action and Limit Levels
Table B-1 Action
and Limit Levels for 1-hour TSP
|
Monitoring
station |
Action
Level (ug/m3) |
Limit
Level (ug/m3) |
|
KTN-DMS4 |
297 |
500 |
|
FLN-DMS1 |
303 |
|
|
FLN-DMS3 |
301 |
Table B-2 Action
and Limit Levels for 24-hour TSP
|
Monitoring
station |
Action
Level (ug/m3) |
Limit
Level (ug/m3) |
|
KTN-DMS4 |
192 |
260 |
|
FLN-DMS1 |
150 |
|
|
FLN-DMS3 |
165 |
Table B-3 Action
and Limit Levels for
Construction Noise
|
Time
Period |
Action
Level |
Limit
Level |
|
0700-1900 hrs on normal weekdays |
When one documented
complaint is received |
75 dB(A) * |
Noted:
If works are to be carried during restricted hours,
the conditions stipulated in the construction noise permit issued by the Noise
Control Authority have to be followed.
(*) reduce
to 70 dB(A) for schools and 65 dB(A) during school examination periods.
Table
B-4.1 Action and Limit
Levels for Water Quality Monitoring(1)
|
Parameters |
Action Level |
Limit Level |
|
DO in mg/L
(depth average)#+ |
5 percentile of
baseline data. |
4 mg/L or 1
percentile of baseline data. |
|
SS in mg/L
(depth averaged)*& |
95 percentile
of baseline data or 120% of upstream control station. |
20 mg/L or 99
percentile of baseline data or 130% of upstream control station. |
|
Turbidity in
NTU (depth averaged)*^ |
95 percentile
of baseline data or 120% of upstream control station. |
99 percentile
of baseline data or 130% of upstream control station. |
|
Unionized
ammonia in mg/L (depth
averaged)*~ |
95 percentile
of baseline data or 120% of upstream control station. |
0.021mg/L or 99
percentile of baseline data or 130% of upstream control station. |
|
Nitrate
nitrogen in mg/L (depth
averaged)*^ |
95 percentile
of baseline data or 120% of upstream control station. |
99 percentile
of baseline data or 130% of upstream control station. |
|
Orthophosphate
in mg/L (depth averaged)*^ |
95 percentile
of baseline data or 120% of upstream control station. |
99 percentile
of baseline data or 130% of upstream control station. |
Remarks:
#
AL of DO is 5 percentile of baseline data or level at control station at same
tide of the same day (whichever lower) and LL of DO is 4.0 mg/L or level at
control station at same tide of the same day (whichever lower);
+
1 percentile of baseline data were adopted for LL for DO as those levels were
greater than 4 mg/L;
*
AL is 120% of control station’s level at the same tide of the same day when
depth average greater than 95 percentile of baseline data;
^
LL is 130% of control station’s level at the same tide of the same day when
depth average greater than 99 percentile of baseline data.
~
LL is 130% of control station’s level at the same tide of the same day when
depth average greater than 99 percentile of baseline data or 0.021mg/L.
&
LL is 130% of control station’s level at the same tide of the same day when
depth average greater than 99 percentile of baseline data or 20mg/L.
Table
B-4.2 Summary of
Baseline Water Quality Monitoring Results (KTN NDA)(1)
|
Monitoring Parameter |
|||||
|
Location Parameter |
KTN-CS1 |
||||
|
Max |
Min |
Average |
5 Percentile |
1 Percentile |
|
|
DO in mg/L |
7.79 |
6.28 |
6.82 |
6.32 |
6.28 |
|
|
Max |
Min |
Average |
95 Percentile |
99 Percentile |
|
Turbidity in NTU |
72.4 |
4.59 |
10.88 |
62.2 |
72.2 |
|
Suspended Solid
in mg/L |
74 |
2 |
9 |
60 |
73 |
|
Unionized
ammonia in mg/L |
0.0005 |
0.0001 |
0.0003 |
0.0004 |
0.0005 |
|
Nitrate nitrogen
in mg/L |
0.52 |
0.09 |
0.27 |
0.50 |
0.52 |
|
Orthophosphate
in mg/L |
0.19 |
0.01 |
0.10 |
0.17 |
0.19 |
|
Monitoring Parameter |
|||||
|
Location Parameter |
KTN-IS1 |
||||
|
Max |
Min |
Average |
5 Percentile |
1 Percentile |
|
|
DO in mg/L |
8.08 |
4.71 |
6.83 |
6.14 |
5.02 |
|
|
Max |
Min |
Average |
95 Percentile |
99 Percentile |
|
Turbidity in NTU
|
44.56 |
4.57 |
8.63 |
38.98 |
44.56 |
|
Suspended Solid
in mg/L |
35 |
2 |
6 |
31 |
35 |
|
Unionized
ammonia in mg/L |
0.0006 |
0.0001 |
0.0004 |
0.0005 |
0.0006 |
|
Nitrate nitrogen
in mg/L |
0.57 |
0.09 |
0.29 |
0.54 |
0.57 |
|
Orthophosphate
in mg/L |
0.14 |
0.03 |
0.09 |
0.13 |
0.14 |
Note:
(1) The Action and Limit Levels
for Water Quality Monitoring and the Summary of Baseline Water Quality
Monitoring Results are according to pre-construction ET’s Updated EM&A
Manual and Baseline Water Quality Monitoring Report (KTN & FLN NDA).
Table
B-5 Action
and Limit Levels for Ambient Arsenic Monitoring
|
Parameter |
Action Level |
Limit Level |
|
Ambient
Arsenic Concentration |
9.36ng/m3 - 80% of
11.7ng/m3 – the highest ambient arsenic concentration predicted
during the construction phase with mitigation measures
implemented) |
11.7ng/m3 - the highest ambient
arsenic concentration predicted during the construction phase with mitigation
measures implemented |
Table
B-6 Action
level in the event of LFG being detected
|
Parameter |
Monitoring Results |
Actions |
|
O2 |
<19% v/v |
Increase underground ventilation to restore O2 to >19% v/v |
|
<18% v/v |
Stop works, evacuate all personnel, prohibit entry, and increase
ventilation to restore O2 level to >19% |
|
|
CH4 |
>10% LEL |
Prohibit hot works, increase ventilation to restore CH4 to <10% LEL |
|
>20% LEL |
Stop works, evacuate all personnel, increase ventilation further to
restore CH4 to <10%
LEL |
|
|
CO2 |
>0.5% v/v |
Increase
ventilation to restore C O2 to <0.5% v/v |
|
>1.5% v/v |
Stop works, evacuate all personnel, increase ventilation further to
restore CO2 to <0.5% |
Table B-7.1 Action
and Limit Levels and Responses to Evidence of Disturbance to Waterbirds using
in Ng Tung, Sheung Yue and Shek Sheung Rivers
|
Action Level |
Response |
Limit Level |
Response |
|
Construction
Phase |
|||
|
Decline
in numbers of all waterbird species relative to numbers during Baseline
Monitoring such
that the Action Level
response is triggered. |
Investigate
cause and if cause
identified as related
to NDAs project instigate
remedial action
to remove or reduce
source of disturbance. |
Decline
in numbers of
all waterbird species
relative to numbers
during Baseline
Monitoring such
that the Limit Level
response is triggered. |
Investigate
cause and
if caused identified
as related to
NDAs project instigate
remedial action.
Review and adjust
LVNP management measures
to improve conditions
for affected
species. |
|
Decline in numbers of any one waterbird species occurring in significant numbers* during Baseline Monitoring such that the Action Level response is triggered. |
Investigate
cause and if cause
identified as related
to NDAs project instigate
remedial action
to remove or reduce
source of disturbance. |
Decline
in numbers of
any one waterbird species
occurring in significant
numbers* during
Baseline Monitoring
such that the
Limit Level response
is triggered. |
Investigate
cause and
if caused identified
as related to
NDAs project instigate
remedial action.
Review and adjust
LVNP management measures
to improve conditions
for affected
species. |
|
Operational Phase |
|||
|
Decline
in numbers of all waterbird species relative to numbers during Baseline
Monitoring such that the Action Level response is triggered. |
Investigate
cause and if cause identified as related to NDAs review and adjust LVNP
management measures to improve conditions for affected species in LVNP. |
Decline
in numbers of all waterbird species relative to numbers during Baseline
Monitoring such that the Limit Level response is triggered. |
Investigate
cause and if cause identified as related to NDAs consider and implement
additional mitigation measures (e.g. additional screening and screen
planting, adjustments to infrastructure design). |
|
Decline
in numbers of any one waterbird species occurring in significant numbers*
during Baseline Monitoring such that the Action Level response is triggered. |
Investigate
cause and if cause identified as related to NDAs review and adjust LVNP
management measures to improve conditions for affected species. |
Decline
in numbers of any one waterbird species occurring in significant numbers*
during Baseline Monitoring such that the Limit Level response is triggered. |
Investigate
cause and if cause identified as related to NDAs consider and implement
additional mitigation measures (e.g. additional screen planting, adjustments
to infrastructure design). |
*
Whether numbers are significant will depend on species and season and should be
determined following collection and evaluation of Baseline survey data.
Table B-7.2 Action
and Limit Levels and Responses to Evidence of Declines in Aquatic Fauna
|
Action Level |
Response |
Limit Level |
Response |
|
Construction
Phase |
|||
|
Reduction in species diversity such that
Action Level response is triggered. |
Investigate cause and if cause identified
as related to Project instigate remedial action to remove or reduce source of
disturbance. |
Reduction
in taxa diversity such that Limit Level response is triggered. |
Investigate
cause and if caused identified as related to Project instigate remedial
action. |
|
Operational
Phase |
|||
|
Reduction in species such that Action
Level response is triggered. |
Investigate cause and if cause identified
as related to Project review and adjust LVNP management measures to improve
conditions for affected species. |
Reduction
in taxa diversity response is triggered. |
Investigate
cause and if cause identified as related to Project consider and implement
additional mitigation measures. |
* Whether numbers are significant will depend on species and season.
Significance threshold for each species should be reviewed following collection
of Baseline survey data.
Table B-7.3 Action
and Limit Levels and Responses to Evidence of Declines in non-aquatic Fauna
|
Action Level |
Response |
Limit Level |
Response |
|
Construction
Phase |
|||
|
Reduction in species diversity such that
Action Level response is triggered. |
Investigate cause and if cause identified
as related to Project instigate remedial action to remove or reduce source of
disturbance. |
Reduction
in taxa diversity such that Limit Level response is triggered. |
Investigate
cause and if caused identified as related to Project instigate remedial action. |
|
Operational
Phase |
|||
|
Reduction in species such that Action
Level response is triggered. |
Investigate cause and if cause identified
as related to Project review and adjust LVNP management measures to improve
conditions for affected species. |
Reduction
in taxa diversity response is triggered. |
Investigate
cause and if cause identified as related to Project consider and implement
additional mitigation measures. |
* Whether numbers are significant will depend on species and season.
Significance threshold for each species should be reviewed following collection
of Baseline survey data.