Appendix B - Action and Limit Levels

Table B-1 Action and Limit Levels for 1-Hour TSP

Location	Action Level, μg/m^3	Limit Level, μg/m^3
AMS1	381	500
AMS4	352

Table B-2 Action and Limit Levels for 24-Hour TSP

Location	Action Level, μg/m^3	Limit Level, μg/m^3
AMS1	170	260
AMS4	171

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 Action and Limit Levels for Water Quality

Parameter (unit)	Water Depth	Action Level	Limit Level
Dissolved Oxygen (mg/L) (surface, middle, bottom)	Surface and Middle	5.0	4.2 except 5 for FCZ
	Bottom	4.7	3.6
Turbidity (NTU)	Depth average	27.5 and 120% of upstream control station’s turbidity at the same tide of the same day	47.0 and 130% of turbidity at the upstream control station at the same tide of same day
Suspended Solids (mg/L)	Depth average	23.5 and 120% of upstream control station’s SS at the same tide of the same day	34.4 and 130% of SS at the upstream control station at the same tide of same day and 10mg/L for WSD Seawater Intakes

Note:

(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 limit occurs when monitoring result is lower that the limit.

(3) For SS & turbidity non-compliance of the water quality limits occur when monitoring result is higher than the limits.

(4) 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.

(5) The 1%-ile of baseline data for dissolved oxygen (surface and middle) and dissolved oxygen (bottom) are 4.2mg/L and 3.6mg/L respectively.