| Note: All Action
and Limit Levels listed below are subject to EPD's approval
During
Construction Stage
Northern
Section
Action and Limit Levels
for 1-hour TSP and 24-hour TSP
|
Parameter |
Location |
Action Level,
mg/m3 |
Limit Level,
mg/m3 |
| 1-hour TSP |
AN3
(Tsing
Chuen Wai) |
297.7 |
500 |
| 24-hour TSP |
158.4 |
260 |
Action
and Limit Levels for Construction Noise
|
Time Period |
Action Level |
Limit Level,
dB(A) |
| AN3
(Tsing Chuen
Wai) |
N4
(Tsoi Yuen
Tsuen (West)) |
| 0700
– 1900 hours on normal weekdays (Leq,
30mins) |
When
one documented complaint is received from any one of the sensitive
receivers |
75 |
75 |
| 1900 – 2300 hours on all days (Leq, 15mins) |
65 |
65 |
| 0700 – 1900 hours on general holiday (Leq, 15mins) |
65 |
65 |
|
2300 – 0700 hours on all days (Leq, 15mins) |
50 |
50 |
Action
and Limit Levels for Local Stream Water Quality Monitoring
| Station |
Parameter |
Action |
Limit |
| S2 |
DO, mg/L |
4.61 |
4 mg/L or 40% saturation at 15OC |
|
Turbidity, NTU |
43.0 and 120% of upstream control station’s turbidity
at the same tide of the same day |
60.2 and 130% of upstream control station’s turbidity
at the same tide of the same day |
|
SS, mg/L |
28.8 and 120% of upstream control station’s SS at the
same tide of the same day |
30.6 and 130% of upstream control station’s SS at the
same tide of the same day |
| S4 |
DO, mg/L |
4 mg/L or 40% saturation at 15OC* |
4 mg/L or 40% saturation at 15OC |
|
Turbidity, NTU |
16.7 and 120% of upstream control station’s turbidity
at the same tide of the same day |
19.4 and 130% of upstream control station’s turbidity
at the same tide of the same day |
| SS, mg/L |
25.3 and 120% of upstream control station’s SS at the
same tide of the same day |
31.5 and 130% of upstream control station’s SS at the
same tide of the same day |
| S6# |
DO, mg/L |
4.53 |
4 mg/L or 40% saturation at 15OC |
|
Turbidity, NTU |
15.9 |
21.2 |
|
SS, mg/L |
20.5 |
22.5 |
| S8 |
DO, mg/L |
4 mg/L or 40% saturation at 15OC* |
4 mg/L or 40% saturation at 15OC |
|
Turbidity, NTU |
251.0 and 120% of upstream control station’s turbidity
at the same tide of the same day |
271.0 and 130% of upstream control station’s turbidity
at the same tide of the same day |
|
SS, mg/L |
247.5 and 120% of upstream control station’s SS at the
same tide of the same day |
362.3 and 130% of upstream control station’s SS at
the same tide of the same day |
| S10 |
DO, mg/L |
4 mg/L or 40% saturation at 15OC* |
4 mg/L or 40% saturation at 15OC |
|
Turbidity, NTU |
48.5 and 120% of upstream control station’s turbidity
at the same tide of the same day |
70.5 and 130% of upstream control station’s turbidity
at the same tide of the same day |
|
SS, mg/L |
45.1 and 120% of upstream control station’s SS at the
same tide of the same day |
49.0 and 130% of upstream control station’s SS at the
same tide of the same day |
*
Since 5%-ile of the baseline data is less than 4 mg/L (the Limit level),
the dissolved oxygen Limit level was adopted as its Action level.
#
No appropriate upstream monitoring station could be identified for S6.
For future turbidity and suspended solids assessment, water quality at
S6 would be compare with its baseline data only.
Southern
Section
Action
and Limit Levels for 1-hour TSP and 24-hour TSP
|
Parameter |
Location |
Action Level, mg/m3 |
Limit Level, mg/m3 |
| 1-hour TSP |
AN6 |
319.9 |
500 |
| AN7 |
304.7 |
| E1 |
304.0 |
|
|
E2 |
297.4 |
|
| 24-hour TSP |
AN6 |
164.8 |
260 |
| AN7 |
189.8 |
| E1 |
210.0 |
|
|
E2 |
182.3 |
|
Action and Limit Levels
(Leq) for Construction Noise
|
Time Period |
Action Level |
Limit Level,
dB(A) |
| N5 |
AN6 |
AN7# |
E1 |
E2 |
|
0700 –
1900 hours on normal weekdays |
When one
documented complaint is received from any one of the sensitive receivers |
75 |
75 |
70/65* |
75 |
75 |
|
0700 – 2300 hours on general holiday 1900 – 2300 hours on all other
days |
65 |
65 |
- |
65 |
65 |
|
2300 – 0700 hours of next day |
50 |
50 |
- |
50 |
50 |
* Reduced
to 65 dB(A) during examination periods
# Not
consider as a sensitive receiver during restricted hours.
During
Operational Stage
AProposed
Criteria to be Used for Determination of Cleaning Frequency, Action Level
and Action
Parameter
|
Reference
Criteria for Determination of Cleaning Frequency
|
Action Level |
Action
|
| Total suspended solids (mg/L) |
81 |
3 consecutive monitoring with the same parameter (1
or more than 1 parameter) exceeded the criteria
|
Increase 1 cleaning event per week
|
| Total organic carbon (mg/L) |
25 |
| Chemical oxygen demand (mg/L) |
90 |
| Nitrite and nitrate (mg/L) |
0.72
|
| Total Kjeldahl Nitrogen (mg/L) |
6.4 |
| Total phoshorus (mg/L) |
0.95 |
| Copper (mg/L) |
0.174 |
| Lead (mg/L) |
0.31 |
|