Appendix
B
- Action and Limit Levels
Table B-1 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-2 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% |