l to identify the extent of construction dust and operational odour impacts;
l to determine the effectiveness of mitigation measures to control dust emission from activities during construction phase and odour control measures during operational phase;
l to audit the compliance of the Contractor with regard to dust control, contract conditions and the relevant dust impact criteria;
l to recommend further mitigation measures if found to be necessary; and
l to comply with action and limit levels for air quality as defined in this Manual.
l Use of regular watering, with complete coverage, to reduce dust emissions from exposed site surfaces and unpaved roads, particularly during dry weather;
l Use of frequent watering for particularly dusty construction areas and areas close to ASRs;
l Side enclosure and covering of any aggregate or dusty material storage piles to reduce emissions. Where this is not practicable owing to frequent usage, watering shall be applied to aggregate fines;
l Open stockpiles shall be avoided or covered. Where possible, prevent placing dusty material storage piles near ASRs;
l Tarpaulin covering of all dusty vehicle loads transported to, from and between site locations;
l Establishment and use of vehicle wheel and body washing facilities at the exit points of the site;
l Provision of wind shield and dust extraction units or similar dust mitigation measures at the loading points, and use of water sprinklers at the loading area where dust generation is likely during the loading process of loose material, particularly in dry seasons / periods;
l Imposition of speed controls for vehicles on unpaved site roads. Ten kilometres per hour is the recommended limit;
l Where possible, routing of vehicles and positioning of construction plant should be at the maximum possible distance from ASRs; and
l Instigation of an environmental auditing program to monitor the construction process in order to enforce controls and modify method of work if dusty conditions arise.
Table 2.1 Analytical Parameters and Methodology
Parameters |
Method |
Dioxin and Furans |
USEPA Method 23 |
HCL and HF |
USEPA Method 26 A USEPA Method 13B sampling train |
Heavy Metals Cd, Ti, Hg, Sb, As, Pb, Cr, Co, Cu, Mn, Ni and V – particulate and gaseous form |
USEPA Method 29 |
Gaseous and vaporous organic substances |
USEPA Method 18 USEPA Method 0031 |
Combustion Gases |
|
Carbon Dioxide |
Fyrite analyser, Combustion analyser |
Carbon Monoxide |
Combustion Gas Analyser |
NOX/NO |
USEPA Reference methods USEPA Method 7 and associated methods, |
Oxygen |
Combustion Gas Analyser (chemical cell and paramagnetic) |
Sulphur dioxide and Sulphuric Acid Mist |
USEPA Method 8 |
Particulate |
ISO 9096, ASTM D3685-98, USEPA Method 17 |
Velocity and Volumetric Flow |
ISO 10780 and ISO 9096 |
· nitrogen oxides
· hydrogen chloride
· hydrogen fluoride
· sulphur dioxide
· opacity
· gaseous and vaporous organic substances
· carbon monoxide
· oxygen
· pressure
· temperature
· water vapour content (The continuous measurement of the water vapour content should not be required if the sampled exhaust gas is dried before the emissions are analysed.)
· temperature and oxygen content of the gas at the appropriate location(s) in the combustion chamber to demonstrate the compliance of the requirements set out in paragraphs 4.3.1 to 4.3.4 of EPD’s Guidance Note on the Best Practicable Means for Incinerators (Municipal Waste Incineration) BPM 12/1
· temperature of the gas at the appropriate location(s) in the chimney to demonstrate that the exit temperature of the exhaust gas from the chimney of the incineration process is not less than 80ºC at full load condition
· other essential operating parameter(s) which may affect the performance of air pollution control measures
l have their individual odour threshold of n-butanol in nitrogen gas in the range of 20 to 80 ppb/v required by the European Standard Method (EN 13725);
l be at least 16 years of age and willing and able to follow instructions;
l be free from any respiratory illnesses;
l be engaged for a sufficient period to build up and monitor/detect at several monitoring location;
l not be allowed to smoke, eat, drink (except water) or use chewing gum or sweets 30 min before and during odour patrol;
l take great care not to cause any interference with their own perception or that of others by lack of personal hygiene or the use of perfumes, deodorants, body lotions or cosmetics; and
l not communicate with each other about the results of their choices.
Table 2.2 Odour Intensity Level
Level |
Odour Intensity |
0 |
Not detected. No odour perceived or an odour so weak that it can not be easily characterised or described |
1 |
Slight identifiable odour, and slight chance to have odour nuisance |
2 |
Moderate identifiable odour, and moderate chance to have odour nuisance |
3 |
Strong identifiable, likely to have odour nuisance |
4 |
Extreme severe odour, and unacceptable odour level |
Table 2.3 Action and Limit Levels for Odour Nuisance
Parameter |
Action Level |
Limit Level |
Odour Nuisance (from odour patrol) |
When one documented compliant are received(1), or Odour Intensity of 2 is measured from odour patrol. |
Two or more documented complaints are received(1) within a week; or Odour intensity of 3 or above is measured from odour patrol. |
Note:
(1) Once the compliant is received by the Project Proponent (EPD), the Project Proponent would investigated and verify the complaint whether it is related to the potential odour emission from the STF and its on-site wastewater treatment plant.
Table 2.4 Event and Action Plan for Odour Monitoring
EVENT |
ACTION |
|
Person-in-charge of Odour Monitoring |
Project Proponent[1] |
|
ACTION LEVEL |
||
Exceedance of action level (Odour Patrol) |
1. Identify source/reason of exceedance; 2. Repeat odour patrol to confirm finding. |
1. Carry out investigation to identify the source/reason of exceedance. Investigation should be completed within 2 week; 2. Rectify any unacceptable practice; 3. Implement more mitigation measures if necessary; 4. Inform EPD or the operator of the WENT Landfill if exceedance is considered to be caused by the operation of the WENT Landfill. |
Exceedance of action level (Odour Complaints) |
1. Identify source/reason of exceedance; 2. Carry out odour patrol to determinate odour intensity. |
1. Carry out investigation and verify the complaint whether it is related to potential odour emission from the nearby WENT Landfill; 2. Carry out investigation to identify the source/reason of exceedance. Investigation should be completed within 2 week; 3. Rectify any unacceptable practice; 4. Implement more mitigation measures if necessary; 5. Inform EPD or the operator of the WENT Landfill if exceedance is considered to be caused by the operation of the WENT Landfill. |
LIMIT LEVEL |
||
Exceedance of Limit level |
1. Identify source/reason of exceedance; 2. Inform EPD; 3. Repeat odour patrol to confirm findings; 4. Increase odour patrol frequency to bi-weekly; 5. Assess effectiveness of remedial action and keep EPD informed of the results; 6. If exceedance stops, cease additional odour patrol. |
1. Carry out investigation to identify the source/reason of exceedance. Investigation should be completed within 2 week; 2. Rectify any unacceptable practice; 3. Formulate remedial actions; 4. Ensure remedial actions properly implemented; 5. If exceedance continues, consider what more/enhanced mitigation measures should be implemented; 6. Inform EPD or the operator of the WENT Landfill if exceedance is considered to be caused by the operation of the WENT Landfill. |
l Location of where the odour nuisance occurred;
l Date and time of the complaint and the nuisance event;
l Description of the complaint, i.e. the type and characteristics of the odour; and an indication of the odour strength (highly offensive/offensive/slightly offensive/just continuously detectable /intermittently detectable);
l Meteorological conditions from the nearest HK Observatory station at the time of complaint; and
l Name and contact information of the complainant.