11                                        Environmental Monitoring and Audit Requirements

11.1                                  Introduction

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.

11.2                                  Organisation and Personnel of the EM&A

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

 

 

 

 

 

 

 

 

 

 

 

 

11.3                                  Monitoring Requirements

11.3.1                            Construction Phase

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.

11.3.2                            Operation/Restoration Phase

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.

11.3.3                            Aftercare Phase

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.

11.4                                  Audit Requirements

11.4.1                            Construction Phase

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. 

11.4.2                            Operation/Restoration Phase

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.

11.4.3                            Aftercare Phase

The restoration plantation will be audited quarterly by the Registered Landscape Architect from the IEC.