Appendix D - Summary of Action and Limit
Levels
Table
1 – Action and Limit Levels for 1-hour TSP
Location |
Action Level |
Limit Level |
AMS2 |
374 mg/m3 |
500 mg/m3 |
AMS3A* |
368
mg/m3 |
500 mg/m3 |
AMS6 |
360 mg/m3 |
500 mg/m3 |
AMS7 |
370
mg/m3 |
500 mg/m3 |
Remarks: * Action
Level set out at AMS3 Ho Yu College is adopted.
Table
2 – Action and Limit Levels for 24-hour TSP
Location |
Action Level |
Limit Level |
AMS2 |
176 mg/m3 |
260 mg/m3 |
AMS3A* |
167
mg/m3 |
260 mg/m3 |
AMS6 |
173 mg/m3 |
260 mg/m3 |
AMS7 |
183
mg/m3 |
260 mg/m3 |
Remarks: * Action
Level set out at AMS3 Ho Yu College is adopted.
Table 3 – Action and
Limit Levels for Construction Noise (0700-1900 hrs of normal weekdays)
Location |
Action Level |
Limit Level |
NMS2 |
When one documented complaint, related to 0700 – 1900 hours on normal weekdays,
is received from any one of the sensitive receivers |
75 dB(A) |
NMS3A |
*65 / 70 dB(A) |
*Daytime noise Limit
Level of 70 dB(A) applies to education institutions, while 65dB(A) applies
during school examination period.
Table 4 – Action and
Limit Levels for Water Quality
Parameters |
Action |
Limit |
DO
in mg L-1 (Surface,
Middle & Bottom) |
Surface
and Middle 5.0 Bottom 4.7 |
Surface
and Middle 4
.2 (except 5 mg/L for FCZ) Bottom 3.6 |
SS
in mg L-1 (depth-averaged) |
23.5
or 120% of upstream control station's SS at the same tide of the same day *23.5
and 120% of upstream control station's SS at the same tide of the same day |
34.4
or 130% of upstream control station's SS at the same tide of the same day and
10mg/L for WSD Seawater intakes *34.4
and 130% of upstream control station's SS at the same tide of the same day
and 10mg/L for WSD Seawater intakes |
Turbidity
in NTU (depth-averaged) |
27.5
or 120% of upstream control station's turbidity at the same tide of the same
day *27.5
and 120% of upstream control station's turbidity at the same tide of the same
day |
47.0
or 130% of upstream control station's turbidity at the same tide of the same
day *47.0
and130% of upstream control station's turbidity at the same tide of the same
day |
*
Remarks:
Reference is made to EPD approval of adjustment of water quality assessment
criteria. The adjustment was effective since 18 February 2013
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, SS,
non-compliance of the water quality limits occurs when monitoring result
is higher than the
limits.