Appendix 3.1 Calculations of Emission Rate at Pui O | |||||||||

Source | Emission Factors | Parameters | Remarks | ||||||

Unmitigated | Mitigated | ||||||||

Works area | Material handling | 1.329293E-02 | 6.646467E-03 | TSP emission factor (kg/Mg) | k*0.0016*(U/2.2 | ||||

along raw water | (g/s) | from AP-42, 5th ed., S13.2.4 | |||||||

mains | Particle size multiplier, k | 0.74 | from AP-42, 5th ed., S13.2.4, particle size < 30 um | ||||||

Material moisture content, M (%) | 4.8 | from AP-42, 5th ed., Table 11.9.3 | |||||||

(g/m/s) | 4.430978E-04 | 2.215489E-04 | Average wind speed, U (m/s) | 5.2 | from Hong Kong Observatory | ||||

assume length = 30m | E (g/Mg) | 1.0634 | calculated | ||||||

Density of the public fill (Mg/m3) | 2 | assumed | |||||||

Capacity (m3/day) | 225 | from engineer | |||||||

No. of working hours per day | 10 | assumed | |||||||

% mitigation | 50 | for watering twice a day & other dust suppression measures (refer | |||||||

approved Updated Final EIA Report - March 1998) | |||||||||

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 | |||

along raw water | (g/s) | TSP emission factor (kg/Mg) | 8.40E-05 | calculated (base on AP-42, 5th ed., S13.2.2 & S13.2.4) | |||||

mains | Density of the public fill (Mg/m3) | 2 | assumed | ||||||

(g/m/s) | 3.500000E-08 | 1.750000E-08 | Capacity (m3/day) | 225 | from engineer | ||||

assume length = 30m | No. of working hours per day | 10 | assumed | ||||||

% mitigation | 50 | for watering twice a day & other dust suppression measures (refer | |||||||

approved Updated Final EIA Report - March 1998) | |||||||||

Works area | Wind erosion | ||||||||

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 | |||

mains | % of dust suppression | 50 | for watering twice a day & other dust suppression measures (refer | ||||||

(g/m/s) | 1.34767E-05 | 6.73833E-06 | approved Updated Final EIA Report - March 1998) | ||||||

Road width = 5m | |||||||||

Connection Point | Material handling | 1.772391E-02 | 8.861956E-03 | TSP emission factor (kg/Mg) | k*0.0016*(U/2.2 | ||||

(Works area betwee | (g/s) | from AP-42, 5th ed., S13.2.4 | |||||||

the existing raw wat | Particle size multiplier, k | 0.74 | from AP-42, 5th ed., S13.2.4, particle size < 30 um | ||||||

mains and proposed | Material moisture content, M (%) | 4.8 | from AP-42, 5th ed., Table 11.9.3 | ||||||

raw water mains) | (g/m2/s) | 1.772391E-04 | 8.861956E-05 | Average wind speed, U (m/s) | 5.2 | from Hong Kong Observatory | |||

assume length = 10m | E (g/Mg) | 1.0634 | calculated | ||||||

road width = 10m | Density of the public fill (Mg/m3) | 2 | assumed | ||||||

Capacity (m3/day) | 300 | from engineer | |||||||

No. of working hours per day | 10 | assumed | |||||||

% mitigation | 50 | for watering twice a day & other dust suppression measures (refer | |||||||

approved Updated Final EIA Report - March 1998) | |||||||||

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 | |||

(Works area betwee | (g/s) | TSP emission factor (kg/Mg) | 8.40E-05 | calculated (base on AP-42, 5th ed., S13.2.2 & S13.2.4) | |||||

the existing raw wat | Density of the public fill (Mg/m3) | 2 | assumed | ||||||

mains and proposed | (g/m2/s) | 1.400000E-08 | 7.000000E-09 | Capacity (m3/day) | 300 | from engineer | |||

raw water mains) | assume length = 10m | No. of working hours per day | 10 | assumed | |||||

road width = 10m | % mitigation | 50 | for watering twice a day & other dust suppression measures (refer | ||||||

approved Updated Final EIA Report - March 1998) | |||||||||

Connection Point | Wind erosion | ||||||||

(Works area betwee | 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 | |||

the existing raw wat | % of dust suppression | 50 | for watering twice a day & other dust suppression measures (refer | ||||||

mains and proposed | approved Updated Final EIA Report - March 1998) | ||||||||

raw water mains) | |||||||||

Pui O Raw Water | Material handling | 5.907971E-03 | 2.953985E-03 | TSP emission factor (kg/Mg) | k*0.0016*(U/2.2 | ||||

Pumping Station | (g/s) | from AP-42, 5th ed., S13.2.4 | |||||||

Particle size multiplier, k | 0.74 | from AP-42, 5th ed., S13.2.4, particle size < 30 um | |||||||

Material moisture content, M (%) | 4.8 | from AP-42, 5th ed., Table 11.9.3 | |||||||

(g/m2/s) | 1.687992E-04 | 8.439958E-05 | Average wind speed, U (m/s) | 5.2 | from Hong Kong Observatory | ||||

E (g/Mg) | 1.0634 | calculated | |||||||

Density of the public fill (Mg/m3) | 2 | assumed | |||||||

Capacity (m3/day) | 100 | from engineer | |||||||

No. of working hours per day | 10 | assumed | |||||||

Active Works Area | 35 | assumed | |||||||

% mitigation | 50 | for watering twice a day & other dust suppression measures (refer | |||||||

approved Updated Final EIA Report - March 1998) | |||||||||

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 | |||

Pumping Station | (g/s) | TSP emission factor (kg/Mg) | 8.40E-05 | calculated (base on AP-42, 5th ed., S13.2.2 & S13.2.4) | |||||

Density of the public fill (Mg/m3) | 2 | assumed | |||||||

(g/m2/s) | 1.333333E-08 | 6.666667E-09 | Capacity (m3/day) | 100 | from engineer | ||||

No. of working hours per day | 10 | assumed | |||||||

Active Works Area | 35 | assumed | |||||||

% mitigation | 50 | for watering twice a day & other dust suppression measures (refer | |||||||

approved Updated Final EIA Report - March 1998) | |||||||||

Pui O Raw Water | Wind erosion | ||||||||

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 | |||

% of dust suppression | 50 | for watering twice a day & other dust suppression measures (refer | |||||||

approved Updated Final EIA Report - March 1998) | |||||||||