| Appendix 3.1 Calculations of Emission Rate at Pui O |
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| Source |
Emission Factors |
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Parameters |
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Remarks |
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Unmitigated |
Mitigated |
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| Works area |
Material handling |
1.329293E-02 |
6.646467E-03 |
TSP emission factor (kg/Mg) |
k*0.0016*(U/2.2)^1.3 / (M/2)^1.4 |
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| along raw water |
(g/s) |
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from AP-42, 5th ed., S13.2.4 |
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| mains |
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Particle size multiplier, k |
0.74 |
from AP-42, 5th ed., S13.2.4,
particle size < 30 um |
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Material moisture content, M (%) |
4.8 |
from AP-42, 5th ed., Table 11.9.3 |
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(g/m/s) |
4.430978E-04 |
2.215489E-04 |
Average wind speed, U (m/s) |
5.2 |
from Hong Kong Observatory |
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assume length = 30m |
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E (g/Mg) |
1.0634 |
calculated |
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Density of the public fill (Mg/m3) |
2 |
assumed |
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Capacity (m3/day) |
225 |
from engineer |
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No. of working hours per day |
10 |
assumed |
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% mitigation |
50 |
for
watering twice a day & other dust suppression measures (refer to an |
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approved Updated Final EIA Report -
March 1998) |
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| Works area |
Wet drilling |
1.050000E-06 |
5.250000E-07 |
PM-10 emission factor (kg/Mg) |
4.00E-05 |
from AP-42, 5th ed., Table 11.19.2-1 |
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| along raw water |
(g/s) |
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TSP emission factor (kg/Mg) |
8.40E-05 |
calculated (base on AP-42, 5th ed.,
S13.2.2 & S13.2.4) |
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| mains |
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Density of the public fill (Mg/m3) |
2 |
assumed |
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(g/m/s) |
3.500000E-08 |
1.750000E-08 |
Capacity (m3/day) |
225 |
from engineer |
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assume length = 30m |
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No. of working hours per day |
10 |
assumed |
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% mitigation |
50 |
for
watering twice a day & other dust suppression measures (refer to an |
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approved Updated Final EIA Report -
March 1998) |
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| Works area |
Wind erosion |
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| along raw water |
E (g/m2/s) |
2.69533E-06 |
1.34767E-06 |
TSP emission factor (Mg/hectare/yr) |
0.85 |
from AP-42, 5th ed., Table 11.9.4 |
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| mains |
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% of dust suppression |
50 |
for
watering twice a day & other dust suppression measures (refer to an |
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(g/m/s) |
1.34767E-05 |
6.73833E-06 |
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approved Updated Final EIA Report -
March 1998) |
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Road width = 5m |
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| Connection Point |
Material handling |
1.772391E-02 |
8.861956E-03 |
TSP emission factor (kg/Mg) |
k*0.0016*(U/2.2)^1.3 / (M/2)^1.4 |
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| (Works area between |
(g/s) |
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from AP-42, 5th ed., S13.2.4 |
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| the existing raw water |
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Particle size multiplier, k |
0.74 |
from AP-42, 5th ed., S13.2.4,
particle size < 30 um |
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| mains and proposed |
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Material moisture content, M (%) |
4.8 |
from AP-42, 5th ed., Table 11.9.3 |
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| raw water mains) |
(g/m2/s) |
1.772391E-04 |
8.861956E-05 |
Average wind speed, U (m/s) |
5.2 |
from Hong Kong Observatory |
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assume length = 10m |
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E (g/Mg) |
1.0634 |
calculated |
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road width = 10m |
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Density of the public fill (Mg/m3) |
2 |
assumed |
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Capacity (m3/day) |
300 |
from engineer |
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No. of working hours per day |
10 |
assumed |
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% mitigation |
50 |
for
watering twice a day & other dust suppression measures (refer to an |
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|
|
approved Updated Final EIA Report -
March 1998) |
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| Connection Point |
Wet drilling |
1.400000E-06 |
7.000000E-07 |
PM-10 emission factor (kg/Mg) |
4.00E-05 |
from AP-42, 5th ed., Table 11.19.2-1 |
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| (Works area between |
(g/s) |
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TSP emission factor (kg/Mg) |
8.40E-05 |
calculated (base on AP-42, 5th ed.,
S13.2.2 & S13.2.4) |
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| the existing raw water |
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Density of the public fill (Mg/m3) |
2 |
assumed |
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| mains and proposed |
(g/m2/s) |
1.400000E-08 |
7.000000E-09 |
Capacity (m3/day) |
300 |
from engineer |
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| raw water mains) |
assume length = 10m |
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No. of working hours per day |
10 |
assumed |
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| |
road width = 10m |
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|
% mitigation |
50 |
for
watering twice a day & other dust suppression measures (refer to an |
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|
|
approved Updated Final EIA Report -
March 1998) |
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| Connection Point |
Wind erosion |
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| (Works area between |
E (g/m2/s) |
2.69533E-06 |
1.34767E-06 |
TSP emission factor (Mg/hectare/yr) |
0.85 |
from AP-42, 5th ed., Table 11.9.4 |
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| the existing raw water |
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% of dust suppression |
50 |
for
watering twice a day & other dust suppression measures (refer to an |
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| mains and proposed |
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|
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approved Updated Final EIA Report -
March 1998) |
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| raw water mains) |
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| Pui O Raw Water |
Material handling |
5.907971E-03 |
2.953985E-03 |
TSP emission factor (kg/Mg) |
k*0.0016*(U/2.2)^1.3 / (M/2)^1.4 |
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| Pumping Station |
(g/s) |
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from AP-42, 5th ed., S13.2.4 |
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Particle size multiplier, k |
0.74 |
from AP-42, 5th ed., S13.2.4,
particle size < 30 um |
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Material moisture content, M (%) |
4.8 |
from AP-42, 5th ed., Table 11.9.3 |
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(g/m2/s) |
1.687992E-04 |
8.439958E-05 |
Average wind speed, U (m/s) |
5.2 |
from Hong Kong Observatory |
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E (g/Mg) |
1.0634 |
calculated |
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Density of the public fill (Mg/m3) |
2 |
assumed |
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Capacity (m3/day) |
100 |
from engineer |
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No. of working hours per day |
10 |
assumed |
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Active Works Area |
35 |
assumed |
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% mitigation |
50 |
for
watering twice a day & other dust suppression measures (refer to an |
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|
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approved Updated Final EIA Report -
March 1998) |
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| Pui O Raw Water |
Wet drilling |
4.666667E-07 |
2.333333E-07 |
PM-10 emission factor (kg/Mg) |
4.00E-05 |
from AP-42, 5th ed., Table 11.19.2-1 |
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| Pumping Station |
(g/s) |
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TSP emission factor (kg/Mg) |
8.40E-05 |
calculated (base on AP-42, 5th ed.,
S13.2.2 & S13.2.4) |
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Density of the public fill (Mg/m3) |
2 |
assumed |
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(g/m2/s) |
1.333333E-08 |
6.666667E-09 |
Capacity (m3/day) |
100 |
from engineer |
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No. of working hours per day |
10 |
assumed |
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Active Works Area |
35 |
assumed |
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|
% mitigation |
50 |
for
watering twice a day & other dust suppression measures (refer to an |
|
| |
|
|
|
|
|
approved Updated Final EIA Report -
March 1998) |
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| Pui O Raw Water |
Wind erosion |
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| Pumping Station |
E (g/m2/s) |
2.69533E-06 |
1.34767E-06 |
TSP emission factor (Mg/hectare/yr) |
0.85 |
from AP-42, 5th ed., Table 11.9.4 |
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|
|
|
% of dust suppression |
50 |
for
watering twice a day & other dust suppression measures (refer to an |
|
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|
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|
|
approved Updated Final EIA Report -
March 1998) |
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