Appendix B     Action and Limit Levels for Air Quality and Noise Monitoring

 

 

B.1.   Air

 

Table B.1    Action and Limit Levels for 1-hour and 24-hour TSP

 

 

Action Level, mg/m3

Limit Level, mg/m3

1-hour TSP*

340

500

24-hour TSP

190

260

 

T        No Action/Limit Level for 1-hour TSP is applied to AM4 where no real time dust monitor is installed.

 

 

 

B.2.   Noise

 

Table B.2 presents the Action and Limit (AL) levels for construction noise other than percussive piling.

 

Table B.2    AL Levels for Construction Noise (Other than Percussive Piling)

 

Parameters

Action

Limit

Noise Levels at the NSR's at Long Tsai Tsuen/Hung Shing Ye and school within the village of Tai Wan San Tsuen predicted by the noise alarm monitoring system

When one or more documented complaints are received

a.   75 dB(A) in LAeq,30 min (07:00-19:00 hrs on normal weekdays)  (Note 1)

b.   subject to statutory control under the Noise Control Ordinance (07:00-23:00 hrs on holidays and 19:00-23:00 hrs on all other days).  Set to 60 dB(A) in LAeq,5 min

c.   subject to statutory control under the Noise Control Ordinance (23:00­-07:00 hrs of next day).  Set to 45 dB(A) in LAeq,5 min

 

Manual noise monitoring at the nearest Pak Kok Tsui residences to cable landing points N4 and N5

Note:

1.                  For educational institution, the limit level shall be 70 dB(A), reduced to 65 dB(A) during examination periods.