This Section describes the requirements for
environmental monitoring and audit (EM&A) during the construction,
operation, restoration and aftercare of the Extension. The objectives of carrying out EM&A
include the following:
· to provide a
database against which any short or long term environmental impacts of the
Project can be determined;
· to provide an
early indication should any of the environmental control measures or practices
fail to achieve the acceptable standards;
· to monitor the performance
of the Project and the effectiveness of mitigation measures;
· to verify the
environmental impacts predicted in the EIA Study;
· to determine
Project compliance with regulatory requirements, standards and government
policies;
· to take remedial
action if unexpected problems or unacceptable impacts arise; and
· to provide data to
enable an environmental audit.
The implementation
schedule, containing the recommended mitigation measures, monitoring and audit
requirements, and implementation agent of the mitigation measures for the
Project, is presented in Annex E. Details of the EM&A requirements are
provided in a stand-alone EM&A Manual.
The proposed organisation of all personnel involved in
the EM&A process is illustrated in Figure 11.2a. The roles and responsibilities of the
various parties involved in the EM&A process are detailed in the EM&A
Manual, and summarised below:
·
Project Proponent: Waste Facilities
Group, Environmental Infrastructure Division, EPD.
·
Project Design,
Construct and Operate: Extension Contractor employed by the Project
Proponent to carry out design, construction and operate the Extension.
·
Environmental Team
(ET): The ET will be responsible for implementing all environmental measures
and EM&A requirements recommended in this EIA Report throughout the construction, operation, restoration and
aftercare of the Extension, and report to the Extension Contractor on all
environmental aspects of the Project.
The ET can be a separate consultants employed by the Extension
Contractor or the Contractor’s in house environmental specialists.
·
Independent
Consultant (IC): The IC will be appointed by the Project Proponent to provide an
independent review and certification of the design, construction, operation,
restoration and aftercare of the Extension.
·
Independent
Environmental Checker (IEC): The IEC will be appointed by the Project Proponent
as part of the IC to provide independent monitoring and audit to verify the
overall environmental performance of the Project and to assess the
effectiveness of the ET in their duties.
An IEC will be responsible to certify all environmental submissions to
the EPD.
·
EPD: the EIAO Authority. The EPD will be the authority to approve
all submissions under the EIAO.
Figure 11.2a Organisation
Chart
Monitoring of
dust, noise and surface water is required during the construction phase. Landfill gas, groundwater and organic
emissions will also be monitored prior to the commencement of waste filling to
establish the baseline conditions for these parameters. The details of the monitoring
requirements are summarized in Table
11.3a and the monitoring locations are shown in Figures 11.3a and 11.3b.
During the
operation/restoration phase, leachate levels within
the landfill, effluent discharged from the LTP, surface water discharged from
the Extension Site, groundwater, dust, odour, noise, landfill
gas, and organic emissions will be monitored at the designated monitoring
locations. The details of the
monitoring requirements are summarized in Table
11.3a and the monitoring locations are shown in Figures 11.3a and 11.3b.
Most of the
monitoring requirements implemented during the operation/restoration phase
should be continued. However, the
number of monitoring locations and frequency of some monitoring aspects could
be relaxed. The details of the
monitoring requirements are summarized in Table
11.3a and the monitoring locations are shown in Figures 11.3a and 11.3b.
Table 11.3a Summary of Monitoring Requirements
Environmental
Aspect |
Construction Phase |
Operation/Restoration Phase |
Aftercare Phase |
||||||
|
Location |
Frequency |
Parameters
(a) |
Location |
Frequency |
Parameters
(a) |
Location |
Frequency |
Parameters
(a) |
Leachate |
- |
- |
- |
Leachate
levels above the basal liner |
Continuous |
Leachate
level |
Leachate
level above the basal liner |
Continuous |
Leachate
level |
|
|
|
|
Effluent discharged from LTP |
Each batch of discharge |
volume, temperature, pH, COD, BOD, TOC, NH4-N, nitrate-N,
nitrite-N, total nitrogen,
chloride, alkalinity, magnesium, calcium, potassium, iron, zinc, suspended
solids, oil & grease, sulphate, copper,
chromium, nickel, cadmium, phosphate and boron. |
Effluent discharge from LTP |
Each batch of discharge |
volume, temperature, pH, COD, BOD, TOC, NH4-N, nitrate-N,
nitrite-N, total nitrogen,
chloride, alkalinity, magnesium, calcium, potassium, iron, zinc, suspended
solids, oil & grease, sulphate, copper,
chromium, nickel, cadmium, phosphate and boron. |
|
|
|
|
Stack of Thermal Oxidizer |
Monthly for the first 12 months and
thereafter at quarterly intervals |
NO2, CO, SO2, benzene
and vinyl chloride and NMOC |
- |
- |
- |
|
|
|
|
Stack of Thermal Oxidizer |
During commissioning of the thermal
oxidizer |
Ammonia |
- |
- |
- |
|
|
|
|
Stack of Thermal Oxidizer |
Continuously |
Gas combustion temperature, exhaust gas temperature and exhaust gas
velocity |
- |
- |
- |
Landfill Gas |
All perimeter landfill gas monitoring
wells |
Monthly, for a period 12 months prior to waste
filling (act as baseline monitoring) |
Methane, carbon dioxide, oxygen (%v/v) |
All perimeter landfill gas monitoring
wells |
Weekly for monitoring wells in the areas
where there is development within 250m of the Extension Site boundary. Monthly for other monitoring wells. |
Methane, carbon dioxide, oxygen (%v/v),
atmospheric pressure |
All perimeter landfill gas monitoring
wells |
Weekly for monitoring wells in the areas
where there is development within 250m of the Extension Site boundary. Monthly for other monitoring wells. |
Methane, carbon dioxide, oxygen (%v/v),
atmospheric pressure |
|
|
|
|
At least 2 perimeter landfill gas
monitoring wells |
Quarterly |
Laboratory analysis for methane, oxygen, nitrogen,
carbon dioxide, carbon monoxide and other flammable gases using gas
chromatography |
At least 2 perimeter landfill gas
monitoring wells |
Quarterly |
Laboratory analysis for methane, oxygen,
nitrogen, carbon dioxide, carbon monoxide and other flammable gases using gas
chromatography |
|
|
|
|
Permanent gas monitoring system in all
occupied on-site buildings |
Continuous |
Methane (or flammable gas), (%v/v) |
Permanent gas monitoring system in all
occupied on-site buildings |
Continuous |
Methane (or flammable gas), (%v/v) |
|
|
|
|
Areas between the Extension Site boundary
and the waste boundary (surface emission) and location of vegetation stress |
Quarterly |
Flammable gas |
Areas between the Extension Site boundary
and the waste boundary (surface emission) |
Quarterly |
Flammable gas |
|
|
|
|
Service voids, utilities pits and
manholes along the Site boundary and within the Extension Site |
Monthly |
Oxygen, methane and carbon dioxide |
Service voids, utilities pits and
manholes along the Site boundary and within the Extension Site |
Monthly |
Oxygen, methane and carbon dioxide |
|
|
|
|
Landfill gas flare(s) |
Monthly for the first 12 months and
thereafter at quarterly interval |
NO2, CO, SO2,
benzene, vinyl chloride and NMOC |
Landfill gas flare(s) |
Quarterly |
NO2, CO, SO2,
benzene, vinyl chloride and NMOC |
|
|
|
|
Landfill gas flare(s) |
Continuously |
Gas combustion temperature, exhaust gas temperature and exhaust gas
velocity |
Landfill gas flare(s) |
Continuously |
Gas combustion temperature, exhaust gas temperature and exhaust gas
velocity |
|
|
|
|
LFG Generator Stack |
Monthly, for a period of 12 months of
operation and thereafter at quarterly intervals |
NO2, CO, SO2 |
LFG Generator Stack |
Quarterly, throughout aftercare phase |
NO2, CO, SO2 |
Surface Water |
All surface water discharge points |
Weekly, throughout construction phase |
pH, SS, DO |
All surface water discharge points |
Monthly |
pH, SS, COD, NH4-N EC, DO, BOD, TOC, carbonate, bicarbonate, nitrate-N, nitrite-N, total
nitrogen, oil & grease, sulphate, sulphide, phosphate, chloride, sodium, potassium, calcium, magnesium, nickel, manganese,
chromium, cadmium, copper, lead, iron, zinc, mercury and boron. |
All surface water discharge points |
Monthly |
pH, SS, COD, NH4-N EC, DO, BOD, TOC, carbonate, bicarbonate, nitrate-N, nitrite-N, total
nitrogen, oil & grease, sulphate, sulphide, phosphate, chloride, sodium, potassium, calcium, magnesium, nickel, manganese,
chromium, cadmium, copper, lead, iron, zinc, mercury and boron. |
|
|
|
|
|
|
|
|
||
Groundwater |
All groundwater monitoring wells |
Monthly, for a period 12 months prior to waste
filling (act as baseline monitoring) |
Water level, pH, EC, COD, BOD, TOC, carbonate, bicarbonate, NH4-N,
nitrate-N, nitrite-N, TKN, total nitrogen, sulphate,
sulphide, chloride, sodium, potassium, calcium,
magnesium chromium, cadmium, zinc, copper, lead, nickel, manganese, iron,
mercury and boron. |
All groundwater monitoring wells |
Monthly |
Water level, pH, EC, COD, BOD, TOC, carbonate, bicarbonate, NH4-N,
nitrate-N, nitrite-N, TKN, total nitrogen, sulphate,
sulphide, chloride, sodium, potassium, calcium,
magnesium chromium, cadmium, zinc, copper, lead, nickel, manganese, iron,
mercury and boron. |
All groundwater monitoring wells |
Monthly |
Water level, pH, EC, COD, BOD, TOC, carbonate, bicarbonate, NH4-N,
nitrate-N, nitrite-N, TKN, total nitrogen, sulphate,
sulphide, chloride, sodium, potassium, calcium,
magnesium chromium, cadmium, zinc, copper, lead, nickel, manganese, iron,
mercury and boron. |
|
- |
- |
- |
Groundwater collection sumps |
Monthly |
pH, EC, COD, BOD, TOC, carbonate, bicarbonate, NH4-N,
nitrate-N, nitrite-N, TKN, total
nitrogen, sulphate, sulphide,
chloride, sodium, potassium, calcium, magnesium chromium, cadmium, zinc,
copper, lead, nickel, manganese, iron, mercury and boron |
Groundwater collection sumps |
Monthly |
pH, EC, COD, BOD, TOC, carbonate, bicarbonate, NH4-N,
nitrate-N, nitrite-N, TKN, total
nitrogen, sulphate, sulphide,
chloride, sodium, potassium, calcium, magnesium chromium, cadmium, zinc,
copper, lead, nickel, manganese, iron, mercury and boron |
Dust |
At two air sensitive receiver (ASRs) |
Once every 6 days, throughout
construction phase |
24-hr TSP |
Along Extension Site boundary |
Once every 6 days, throughout operation/
restoration phase |
24-hr TSP |
Along Extension Site boundary |
Once every 6 days when there are major
maintenance works |
24-hr TSP |
Noise |
At two monitoring location near the
Extension Site boundary |
Weekly |
LAeq
30 min |
At two monitoring location near the Extension
Site boundary |
Weekly |
LAeq
30 min |
At two monitoring location near the
Extension Site boundary |
Weekly when there are major maintenance
works |
LAeq
30 min |
Ambient VOCs,
Ammonia and Hydrogen Sulphide |
Along Extension Site boundary |
Quarterly, for a period 12 months prior
to waste filling (act as baseline monitoring) |
A suite of VOCs,
ammonia and hydrogen sulphide |
Along Extension Site boundary |
Quarterly, throughout operation/
restoration phase |
A suite of VOCs,
ammonia and hydrogen sulphide |
Along Extension Site boundary |
Quarterly, throughout aftercare phase |
A suite of VOCs,
ammonia and hydrogen sulphide |
Odour |
- |
- |
- |
Patrol along Extension Site boundary |
Daily, three times a day by ET and IEC Three times per week on different days
conducted by an independent third party together with the ET and the IEC |
Odour intensity |
Patrol along Extension Site boundary |
Weekly when there are maintenance works
required excavation of waste |
Odour intensity |
Meteorological Condition |
|
|
|
Meteorological Station |
Continuously |
Wind speed, wind direction, air
temperature, rainfall and relative humidity |
Meteorological Station |
Continuously |
Wind speed, wind direction, air temperature, rainfall
and relative humidity |
Note: (a) Chemical abbreviations: BOD = biological oxygen
demand; CO = carbon monoxide; COD = chemical oxygen
demand; DO = dissolved oxygen; EC = electrical conductivity; NH4-N
= ammoniacal-nitrogen; nitrate-N = nitrate
nitrogen; nitrite-N = nitrite-nitrogen; NMOC = non-methane organic compound;
NO2 = nitrogen dioxide; RSP = respirable
suspended particulates; SS = suspended solids; TKN = Total Kjeldahl nitrogen; TOC = total
organic carbon; TSP = total suspended particulates; VOCs = volatile organic compounds. |
Weekly site audits
will be undertaken jointly by the Extension Contractor, the IEC and the site representative
of the Project Proponent during the construction phase to ensure that the
proposed mitigation measures and good site practices are implemented.
During the
preparation of the detailed landscape design plan, the design submission will
be audited against the recommendation proposed in this EIA Report by the landscape architect from the IEC.
Weekly site audits
will be undertaken to ensure the proposed environmental mitigation measures are
implemented. The audit will cover
the aspects on the management of dust, odour, noise,
surface water and effluent discharge from the LTP, waste management and
landfill gas. The audits will be
undertaken jointly by the Extension Contractor and the IEC.
The condition of
the restoration plantation will be audited at monthly intervals by a Registered
Landscape Architect from the IEC.
The restoration
plantation will be audited quarterly by the Registered Landscape Architect from
the IEC.