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/m^3	500 mg/m^3
AMS3A*	368 mg/m^3	500 mg/m^3
AMS6	360 mg/m^3	500 mg/m^3
AMS7	370 mg/m^3	500 mg/m^3

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/m^3	260 mg/m^3
AMS3A*	167 mg/m^3	260 mg/m^3
AMS6	173 mg/m^3	260 mg/m^3
AMS7	183 mg/m^3	260 mg/m^3

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	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
Turbidity in NTU (depth-averaged)	27.5 or 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

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.