Contents

Executive Summary                                               

1                        Introduction                                                            

1.1                     Background                                                              

1.2                     Project Description                                             

1.3                     Scope of the EM&A Report                                 

1.4                     Project Organisation                                          

1.5                     Summary of Construction Works                  

1.6                     Summary of EM&A Programme Requirements                                                           

1.7                     Status of Statutory Environmental Compliance with the Environmental Permit                                                                           

1.8                     Status of Other Statutory Environmental Requirements                          

2                        EM&A Results                                                            

2.1                     Air Quality Monitoring                                        

2.2                     Noise Monitoring                                                    

2.3                     Surface Water Quality Monitoring              

2.4                     Landscape and Visual Monitoring                 

2.5                     EM&A Site Inspection                                             

2.6                     Waste Management Status                                

2.7                     Implementation Status of Environmental Mitigation Measures                                             

2.8                     Summary of Exceedances of the Environmental Quality Performance Limit

2.9                     Summary of Complaints, Notification of Summons and Successful Prosecutions    

3                        Future Key Issues                                                   

3.1                     Construction Programme for the Coming Month                                                                           

3.2                     Key Issues for the Coming Month                   

3.3                     Monitoring Schedule for the Coming Month                                                                           

4                        Conclusion and Recommendation                  

 

Annexes

Annex A         Work Programme

Annex B         Environmental Mitigation Implementation Schedule

Annex C         Monitoring Schedule for This Reporting Period

Annex D         Air Quality
Annex D1       Calibration Certificates for Dust Monitoring Equipment
Annex D2       24-hour TSP Monitoring Results
Annex D3       Event and Action Plan for Dust Monitoring
Annex D4       Meteorological Data

Annex E         Noise
Annex E1       Calibration Certificates for Noise Monitoring Equipment
Annex E2       Noise Monitoring Results
Annex E3       Event and Action Plan for Noise Monitoring

Annex F         Surface Water Quality
Annex F1       Calibration Certificates for Surface Water Quality Monitoring Equipment
Annex F2       Surface Water Quality Monitoring Results
Annex F3       Event and Action Plan for Surface Water Quality Monitoring

Annex G         Cumulative Statistics on Exceedances, Environmental Complaints, Notification of Summons and Status of Prosecutions

Annex H         Monitoring Schedule for the Next Reporting Period

 

Executive Summary

The SENT Landfill Extension (SENTX) forms an integral part in the Strategic Plan in maintaining the continuity of landfill capacity in the Hong Kong for the cost-effective and environmentally satisfactory disposal of waste.  ERM-Hong Kong, Limited (ERM) is commissioned to undertake the role of Environmental Team (ET) for the construction, operation/restoration and aftercare of SENTX Project (the Project) in accordance with the requirements specified in the Environmental Permit (EP), updated Environmental Monitoring and Audit (EM&A) Manual, the approved Environmental Impact Assessment (EIA) Report of the Project taking account of the latest design and other relevant statutory requirements.  The construction (not including works related to site clearance and preparation) of the Project commenced on 2 January 2019.

This Monthly EM&A report presents the EM&A works carried out during the period from 1 to 31 March 2020 for the Project in accordance with the updated EM&A Manual. 

Exceedance of Action and Limit Levels for Air Quality

No exceedance of Action and Limit Levels for construction air quality monitoring was recorded in the reporting period.

Exceedance of Action and Limit Levels for Noise

No exceedance of Action and Limit Levels for construction noise monitoring was recorded in the reporting period. 

Exceedance of Action and Limit Levels for Surface Water Quality

Sampling could not be carried out for all the scheduled impact surface water quality monitoring events during the reporting period due to insufficient flow.

Environmental Complaints, Summons and Prosecutions

There were no complaints, notification of summons or prosecution recorded in the reporting period.

Reporting Change

There was no reporting change in the reporting period.

Future Key Issues

Potential environmental impacts arising from the upcoming construction activities in the next reporting period of April 2020 are mainly associated with the potential surface water impact in the rainy season.

 


1                                 Introduction

1.1                            Background

The SENT Landfill Extension (SENTX) forms an integral part in the Strategic Plan in maintaining the continuity of landfill capacity in the Hong Kong for the cost-effective and environmentally satisfactory disposal of waste.  The Environmental Impact Assessment (EIA) Report and the associated Environmental Monitoring and Audit (EM&A) Manual for the construction, operation, restoration and aftercare of the SENTX (hereafter referred to as the Project) have been approved under the Environmental Impact Assessment Ordinance (EIAO) in May 2008 (Register No.: AEIAR-117/2008) (hereafter referred to as the approved EIA Report) and an Environmental Permit (EP-308/2008) (EP) was granted by the Director of Environmental Protection (DEP) on 5 August 2008. 

Since then, applications for Variation of an Environmental Permit (No. VEP-531/2017) were submitted to EPD and the Variation of Environmental Permits (EP-308/2008/A and EP-308/2008/B) were granted on 6 January 2012 and 20 January 2017, respectively, as the Hong Kong SAR Government has decided to reduce the scale of the design scheme of SENTX assessed in the approved EIA Report and SENTX will only receive construction waste.  In May 2018, a Further Environmental Permit (FEP) (FEP-01/308/2008/B) was granted to the SENTXs contractor, Green Valley Landfill, Limited (GVL).

ERM-Hong Kong, Limited (ERM) and Meinhardt Infrastructure and Environment Limited (Meinhardt) are commissioned to undertake the roles of Environmental Team (ET) and the Independent Environmental Checker (IEC), respectively, to undertake the EM&A activities for the Project in accordance with the requirements specified in the EP, updated EM&A Manual ([1]), approved EIA Report ([2]) taking account of the latest design and other relevant statutory requirements.

1.2                            Project Description

The SENTX is a piggyback landfill, occupying the southern part of the existing SENT Landfill (including its infrastructure area) and 13 ha of Tseung Kwan O (TKO) Area 137.  A layout plan of the SENTX is shown in Figure 1.1.  Under the latest design, the SENTX has a net void capacity of about 6.5 Mm3 and provides an additional lifespan of about 6 years, commencing operation upon exhaustion of the SENT Landfill.  The SENTX will receive construction waste only.

The key implementation milestones of the Project are indicatively summarised in Table 1.1.  The construction works of the Project commenced on 2 January 2019.

Table 1.1        Estimated Key Dates of Implementation Programme

Key Stage of the Project

Indicative Date

Start construction

2 January 2019

Commissioning of new infrastructure facilities

2020

Demolition of existing infrastructure facilities

2021

Start waste intake at SENTX

2021 or upon exhaustion of SENT Landfill

Estimated exhaustion date of SENTX

2027

End of aftercare for SENTX

2057

The major construction works of the SENTX includes:

     Site formation at the TKO Area 137 and the existing infrastructure area at SENT Landfill;

     Construction of surface and groundwater drainage systems;

     Construction of the leachate containment and collection systems;

     Construction of new leachate and landfill gas treatment facilities, site offices, maintenance yards at the new infrastructure area;

     Construction of new pipelines to transfer the leachate and landfill gas collected from the existing SENT Landfill to the treatment facilities at the new infrastructure area;

     Construction of the site access and new waste reception facilities; and

     Demolition of the facilities at the existing SENT Landfill infrastructure area.

1.3                            Scope of the EM&A Report

This is the Monthly EM&A Report for the Project which summarises the key findings of the EM&A programme during the reporting period from 1 to 31 March 2020 for the construction works.

1.4                            Project Organisation

The organisation structure of the Project is presented in Figure 1.2

Figure 1.2      Organisation Chart

Contact details of the key personnel are summarised in Table 1.2 below.

Table 1.2      Contact Information of Key Personnel

Party

Position

Name

Telephone

Contractor

(Green Valley Landfill Limited)

Project Manager

Gary Barnicott

2706 8827

Environmental Team (ET) (ERM-Hong Kong, Limited)

 

ET Leader

Frank Wan

2271 3152

Independent Environmental Checker (IEC)

(Meinhardt Infrastructure and Environment Limited)

 

IEC

W.K. Chiu

2859 1881

1.5                            Summary of Construction Works

The programme of the construction is shown in Annex A.  As informed by the Contractor, the major works carried out in this reporting period include:

     Building services works and fitting-out works for Landfill Gas Plant area;

     Building services works and fitting-out works for infrastructure buildings (EPD building, GVL building and laboratory building);

     Installation of accessories such as staircases, pipes and walkways for equalization tanks, sequencing batch reactor tanks, treated effluent tank, Glass Reinforced Plastic (GRP) tanks and other tanks at Leachate Treatment Plant (LTP) area;

     Placing leachate stone at Cell 2X;

     Maintenance and improvement of the temporary surface water drainage;

     Shotcreting and mass concrete for Buttress Wall;

     Finishing works for Western perimeter bund;

     Construction of perimeter bund channel;

     Installation of monitoring well LFG23;

     Construction of superstructure of fire service tank room and water service room; and

     Construction of pits and ducting for underground utilities.

The implementation schedule of the mitigation measured recommended in the Updated EM&A Manual is presented in Annex B.

1.6                            Summary of EM&A Programme Requirements

The status for all environmental aspects are presented in Table 1.3.  The EM&A requirements remained unchanged during the reporting period.

Table 1.3        Summary of Status for the Environmental Aspects under the Updated EM&A Manual

Parameters

Status

Air Quality

Baseline Monitoring

The results of baseline air quality monitoring were reported in Baseline Monitoring Report and submitted to EPD under EP Condition 3.3

Impact Monitoring

On-going

Noise

Baseline Monitoring

The results of baseline noise monitoring were reported in Baseline Monitoring Report and submitted to EPD under EP Condition 3.3

Impact Monitoring

On-going

Surface Water Quality

Baseline Monitoring

The results of baseline surface water quality monitoring were reported in Baseline Monitoring Report and submitted to EPD under EP Condition 3.3

Impact Monitoring

On-going

Waste Management

Waste Monitoring

On-going

Landscape and Visual

Baseline Monitoring

The results of baseline landscape and visual monitoring were reported in Baseline Monitoring Report and submitted to EPD under EP Condition 3.3

Construction Phase Audit

On-going

Site Environmental Audit

Regular Site Inspection

On-going

Complaint Hotline and Email Channel

On-going

Environmental Log Book

On-going

Groundwater Quality

 

Pre-operation Baseline Monitoring

Commenced on 24 March 2020

Landfill Gas

 

Pre-operation Baseline Monitoring

Commenced on 24 March 2020

Taking into account the construction works, impact monitoring of air quality, noise, surface water quality and waste management were carried out in the reporting period.  The impact monitoring schedule of air quality, noise and surface water quality monitoring are provided in Annex C.  Groundwater and landfill gas pre-operation baseline monitoring were commenced on 24 March 2020.

The EM&A programme also involved environmental site inspections and related auditing conducted by the ET for checking the implementation of the required environmental mitigation measures recommended in the approved EIA Report and relevant EP submissions.  To promote the environmental awareness and enhance the environmental performance of the contractors, environmental trainings and regular environmental management meetings were conducted during the reporting period, which are summarised as below:

Ÿ  One environmental management meeting was held with the Contractor, ER, ET, IEC and EPD on 19 March 2020; and

Ÿ  Environmental toolbox trainings on Mosquito Control and Illegal Dumping were provided on 8 March and 25 March 2020 respectively by the Contractor to the workers.

1.7                            Status of Statutory Environmental Compliance with the Environmental Permit

The status of statutory environmental compliance with the EP conditions under the EIAO, submission status under the EP and implementation status of mitigation measures are presented in Table 1.4

Table 1.4        Status of Submissions required under the EP and Implementation Status of Mitigation Measures

EP Condition

Submission / Implementation Status

Status

2.3

Management Organisation of Main Construction Companies

Submitted and accepted by EPD.

2.4

Setting up of Community Liaison Group

Community Liaison Group was set up.

2.5

Submission of Detailed Landfill Gas Hazard Assessment Report

Submitted and accepted by EPD on 10 January 2019.

2.6

Submission of Restoration and Ecological Enhancement Plan

Submitted to EPD on 28 June 2019.

2.7

Setting up of Trial Nursery

Trial Nursery works was commenced on 28 August 2019.

2.8

Advance Screen Planting

Advance Screen Planting works were completed on 28 June 2019.

2.9

Provision of Multi-layer Composite Liner System

Under implementation.

1.8                            Status of Other Statutory Environmental Requirements

The environmental licenses and permits (including EP, Water Pollution Control Ordinance (WPCO) discharge license, registration as a chemical waste producer, and construction noise permit) that are valid in the reporting period are presented in Table 1.5.  No non-compliance with environmental statutory requirements was identified. 

Table 1.5        Status of Statutory Environmental Requirements

Description

Ref No.

Status

Environmental Permit

EP-308/2008

Granted on 5 August 2008

Variation of Environmental Permit

EP-308/2008/A

Granted on 6 January 2012

EP-308/2008/B

Granted on 20 January 2017

Further Environmental Permit

FEP-01/308/2008/B

Granted on 16 May 2018

Water Discharge License under WPCO (Permit Holder: Chun Wo)

Licence No.: WT00033525-2019

Validity from 27 March 2019 to 31 March 2024

Billing Account for Disposal of Construction Waste

 

Chit Account Number: 5001692

Approved on 28 December 2005

Registration as a Chemical Waste Producer (Permit Holder: Chun Wo)

5213-839-C3507-10

Issued on 23 August 2018

Registration as a Chemical Waste Producer (Permit Holder: REC)

5518-839-R2289-06

Issued on 24 October 2019

Construction Noise Permit (Permit Holder: GVL)

GW-RE0075-20

Validity from 12 February 2020 to 11 August 2020

Construction Noise Permit (Permit Holder: Chun Wo)

GW-RE1001-19

Validity from 16 December 2019 to 10 June 2020

Construction Noise Permit (Permit Holder: REC)

GW-RE0029-20

Validity from 20 January 2020 to 31 May 2020

2                                 EM&A Results

The EM&A programme for the Project required environmental monitoring for air quality, noise and surface water quality as well as environmental site inspections for air quality, noise, surface water quality, waste management, and landscape and visual impacts.  The EM&A requirements and related findings for each component are summarised in the following sections.

2.1                            Air Quality Monitoring

2.1.1                        Monitoring Requirements and Equipment

According to the updated EM&A Manual of the Project, impact air quality monitoring (dust, in term of Total Suspended Particulates (TSP)) was carried out at the two designated monitoring locations (i.e. DM1 and DM2) at a 6-day interval.  As there are two existing TSP monitoring stations (i.e. TKO-A1 and TKO-A2a) currently operating by the Civil Engineering and Development Department (CEDD) to monitor the 24-hour TSP levels at the proposed dust monitoring stations for the SENTX, it is considered that the CEDD monitoring data can represent the dust condition of the SENTX during the construction phase.

The Action and Limit Levels of the air quality monitoring is provided in Table 2.1 below.

Table 2.1        Action and Limit Levels for 24-hour TSP

Monitoring Station

Action Level

Limit Level

DM-1 Site Egress of TKO Area 137 Fill Bank

 

204 g m-

260 g m-

DM-2A Combined Reception and Exit Office (CREO) of TKO Area 137 Fill Bank

193 g m-

260 g m-

High volume air samplers (HVSs) in compliance with the specifications listed under Section 3.2.2 of the updated EM&A Manual were used to measure 24-hour TSP levels at the CEDD dust monitoring stations.  The HVSs were calibrated upon installation and thereafter at bi-monthly intervals to check the validity and accuracy of the results.

The equipment used in the impact air quality monitoring programme and monitoring locations are summarised in Table 2.2 and illustrated in Figure 2.1 respectively.  Copies of the calibration certificates for the equipment are presented in Annex D1.

Table 2.2        Dust Monitoring Details

Monitoring Station

Location

Parameter

Frequency and Duration

Monitoring Dates

Equipment

DM1

Site Egress of TKO Area 137 Fill Bank

24-hour TSP

Once every 6 days during the construction phase of the Project

5, 11, 17, 23, 29 March 2020

HVS Greasby 105 (S/N: 9795 (ET/EA/003/18))

DM2

Combined Reception and Exit Office (CREO) of TKO Area 137 Fill Bank

HVS Andersen G1051 (S/N: 1176 (ET/EA/003/05))

2.1.2                        Monitoring Schedule for the Reporting Month

The schedule for air quality monitoring during the reporting period is provided in Annex C.

2.1.3                        Results and Observations

The monitoring results for 24-hour TSP are summarised in Table 2.3.  The detailed monitoring results and the graphical presentation of the 24-hour TSP results at each monitoring location are provided in Annex D2.

Table 2.3        Summary of 24-hour TSP Monitoring Results in the Reporting Period

Monitoring Station

Average 24-hr TSP Concentration (g m-3) (Range in bracket)

Action Level  (g/m3)

Limit Level  (g/m3)

DM-1 Site Egress of TKO Area 137 Fill Bank

102 (91 - 113)

 

204

260

DM-2A Combined Reception and Exit Office (CREO) of TKO Area 137 Fill Bank

90 (85 94)

193

260

The major dust sources in the reporting period included fugitive dust emission from exposed area in SENTX, as well as nearby operations of the existing SENT landfill and the TKO Area 137 Fill Bank.

All the 24-hour TSP results were below the Action and Limit Levels at the monitoring locations in the reporting period.  No action is thus required to be undertaken in accordance with the Event and Action Plan presented in Annex D3.

2.1.4                        Meteorological Data

Meteorological data obtained from the on-site meteorological monitoring station at the existing SENT landfill (see Figure 2.1) were used for the dust monitoring and are shown in Annex D4.  The meteorological station will be relocated to a new position for SENTX as per the updated EM&A Manual after the new infrastructure area at the SENTX is constructed.  It is considered that meteorological data obtained at the existing the on-site meteorological monitoring station are representative of the Project area and could be used for the construction phase dust monitoring programme for the Project.

2.2                            Noise Monitoring

2.2.1                        Monitoring Requirements and Equipment

According to the updated EM&A Manual of the Project, impact noise monitoring was conducted weekly at the monitoring location (i.e. NM1) to obtain one set of 30 minutes measurement between 07:00 and 19:00 hours on normal weekdays. 

The Action and Limit Levels for construction noise of the Project are provided in Table 2.4 below. 

Table 2.4        Action and Limit Levels for Construction Noise

Time Period

Action Level (a)

Limit Level (b)

07:00 19:00 hrs on normal weekdays

When one documented complaint is received from any one of the noise sensitive receivers (NSRs)

or

75 dB(A) recorded at the monitoring station

75 dB(A) at NSRs

Notes:

(a)      75dB(A) along and at about 100m from the SENTX site boundary was set as the Action Level.

(b)      Limits specified in the GW-TM and IND-TM for construction and operational noise, respectively. 

 

Noise monitoring was performed by ALS Technichem (HK) Pty Ltd. (HOKLAS Registration No. 066) using sound level meter at the designated monitoring station NM1 (see Figure 2.1) in accordance with the requirements stipulated in the updated EM&A Manual.  Acoustic calibrator was deployed to check the sound level meter at a known sound pressure level.  Details of the deployed equipment are provided in Table 2.5.  Copies of the calibration certificates for the equipment are presented in Annex E1

Table 2.5        Noise Monitoring Details

Monitoring Station (1)

Location

Parameter

Frequency and Duration

Monitoring Dates

Equipment

NM1

SENTX Site Boundary (North)

Leq (30 min) measurement between 07:00 and 19:00 hours on normal weekdays

(Monday to Saturday)

Once per week for 30 mins during the construction period of the Project

5, 12, 18, 26 March 2020

Sound Level Meter: B&K 2238 (S/N: 2285762)

 

Acoustic Calibrator:

Rion NC-74 (S/N: 34657231)

2.2.2                        Monitoring Schedule for the Reporting Month

The schedule for noise monitoring during the reporting period is provided in Annex C.

2.2.3                        Results and Observations

A total of 4 impact noise monitoring events were scheduled during the reporting period.  However, monitoring was not conducted on 18 March 2020 due to adverse weather condition.  Results for noise monitoring are summarised in Table 2.6.  The monitoring results and the graphical presentation of the data are provided in Annex E2.

Table 2.6        Summary of Construction Noise Monitoring Results in the Reporting Period

Monitoring Station

Measured Noise Level Leq (30 min), dB(A)

Average

Range

Action and Limit Level

NM1

52.5

50.5 54.9

75

Major noise sources identified during the noise monitoring included noise from operations of the existing SENT landfill and the TKO Area 137 Fill Bank, aircrafts and insects.

No Action and Limit Levels exceedance was recorded for construction noise monitoring in the reporting period.  No action is thus required to be undertaken in accordance with the Event and Action Plan presented in Annex E3.

2.3                            Surface Water Quality Monitoring

2.3.1                        Monitoring Requirements and Equipment

According to the updated EM&A Manual of the Project, impact surface water quality monitoring were carried out at the three designated surface water discharge points (i.e. DP3, DP4 and DP6) weekly to ensure that the SENTX will not cause adverse water quality impact.  Temporary relocation of surface water discharge point DP4 to DP4 (Future, temporary) as an interim arrangement due to site constraints and construction sequence was approved by EPD on 14 May 2019.  Surface water quality monitoring was carried out at DP4 (Future, temporary) (i.e. DP4T) from the monitoring event on 16 May 2019.  In addition, suspension of impact surface water quality monitoring at DP3 was approved under the Baseline Monitoring Report by EPD on 24 July 2019 until the actual commencement of construction works affecting DP3 in 2021.

Dissolved Oxygen (DO) and pH value were measured in-situ whereas the level of suspended solids (SS) were determined by ALS Technichem (HK) Pty Ltd. (HOKLAS Registration No. 066).

The Action and Limit Levels of the surface water quality impact monitoring are provided in Table 2.7.

Table 2.7        Action and Limit Levels for Surface Water Quality

Parameters

Action Level

Limit Level

 

DP4 & DP6

DO

< 5.80 mg/L

< 5.42 mg/L

SS

> 11.7 mg/L

> 12.7 mg/L

pH

> 8.39

> 8.40

The locations of the monitoring stations for the Project are shown in Figure 2.1.  All in situ monitoring instruments were checked, calibrated and certified by a laboratory accredited under HOKLAS or other international accreditation scheme before use, and subsequently re-calibrated at 3 monthly intervals throughout all stages of the surface water quality monitoring programme.  Calibration for a DO meter was carried out before measurement according to the instruction manual of the equipment model.  Details of the equipment used in the impact surface water quality monitoring works are provided in Table 2.8.  Copies of the calibration certificates for the equipment are presented in Annex F1

Table 2.8      Impact Surface Water Quality Monitoring Details

Monitoring Station

Location

Frequency

Monitoring Dates

Parameter

Equipment

DP4 (Future, temporary)

Surface water discharge point DP4

Weekly

5, 12, 18, 26 March 2020

pH

DO

SS

YSI Professional Plus (S/N: 17B102764)

 

DP6

Surface water discharge point DP6

Notes:

(a)   DP4 was temporary relocated to DP4 (Future, temporary) (i.e. DP4T) as an interim discharge point from the monitoring event on 16 May 2019.

(b)   Impact surface water quality monitoring at DP3 was suspended from the monitoring event on 25 July 2019 until the actual commencement of construction works affecting DP3 in 2021.

2.3.2                        Monitoring Schedule for the Reporting Month

The schedule for surface water quality monitoring during the reporting period is provided in Annex C.

2.3.3                        Results and Observations

A total of 4 monitoring events for impact surface water quality monitoring were scheduled at all designated monitoring stations during the reporting period.  However, sampling could not be carried out for all scheduled events during the reporting period due to insufficient flow.  Details of impact water quality monitoring events are provided in Annex F2.

No actions is thus required to be undertaken in accordance with the Event and Action Plan presented in Annex F3.

2.4                            Landscape and Visual Monitoring

2.4.1                        Monitoring Requirements

According to the updated EM&A Manual of the Project, the monthly landscape and visual audit was conducted on 25 March 2020 to monitor the implementation of the landscape and visual mitigation measures during construction phase.

All relevant environmental mitigation measures listed in the approved EIA Report and the updated EM&A Manual and their implementation status are summarised in Annex B.

2.4.2                        Results and Observations

The Contractor has implemented environmental mitigation measures as stated in the approved EIA Report and the EM&A Manual.

Regarding the landscape and visual audit, the Contractor was reminded to maintain the advance screen planting works as soon as possible to ensure effective screening of views of project works from the High Junk Peak Trail.  The Contractor shall consider the mitigation measures during the design phase, including the preparation of the Construction Drawings and Detailed Landscape Design Drawings.

2.5                          EM&A Site Inspection

Site inspections were carried out on a weekly basis with the Contractor, IEC and ER to monitor the implementation of proper environmental pollution control and mitigation measures for air quality, noise, surface water quality and waste management under the Project.  In the reporting period, 4 site inspections were carried out on 5, 12, 19 and 26 March 2020.

Key observations during the site inspections are summarised in Table 2.9.

Table 2.9        Key Observations Identified during the Site Inspection in this Reporting Month

Inspection Date

Environmental Observations and Recommendations

5 March 2020

          The Contractor shall conduct activities related to dusty materials i.e. shotcrete mixing near DP4T channel in an area sheltered on the top and three sides to minimise dust impact.

          The Contractor shall display NRMM label on the bulldozer near sediment trap.

          The Contractor shall provide drip trays for chemicals stored near buttress wall, DP4T channel and future GVL building.

          The Contractor shall remove the stagnant milky water near future bioplant and LTP sump pit and treat as chemical waste.

          The Contractor shall dispose of the construction waste accumulated near buttress wall regularly.

          The Contractor shall remove the general refuse near future bioplant to reduce odour and pest issues.

12 March 2020

          The Contractor shall remove the deposited silt and grit in the DP4T channel near buttress wall to ensure the channel is functioning properly.

          The Contractor shall replace the faded NRMM label on the excavator near DP4T channel.

          The Contractor shall provide drip tray for the chemical placed near buttress wall.

          The Contractor shall store the construction waste accumulated near buttress wall in refuse skips and dispose of the waste regularly.

19 March 2020

          The Contractor shall maintain the drain along Western site boundary and dispose of the general refuse and chemical waste accumulated in the drain separately.

          The Contractor shall replace the faded NRMM labels on the bulldozer and roller near sediment trap.

          The Contractor shall provide drip tray for the chemical placed near future GVL building.

          The Contractor shall avoid accumulation of stagnant water in X10a channel and around future GVL building.

          The Contractor shall remove the general refuse near future LFG plant and at DP6 channel.

26 March 2020

          The Contractor shall replace the faded NRMM label displayed on the air compressor near buttress wall.

          The Contractor shall clear the oil spillage at the drip tray near DP6 channel and treat the clean-up materials as chemical waste.

          The Contractor shall provide drip trays for chemicals placed near DP4T channel and future laboratory building.

          The Contractor shall avoid accumulation of stagnant water in the sump pit near future LTP and treat the water before discharge.

          The Contractor shall store general refuse separately from construction waste in the refuse skip near DP4T channel.

          The Contractor shall dispose of the waste accumulated near buttress wall regularly.

The Contractor has rectified all of the observations identified during environmental site inspections in the reporting period.  Key environmental deficiencies identified and the corresponding rectification actions are presented in Table 2.10.

Table 2.10      Summary of Environmental Deficiencies Identified and Corresponding Rectification Actions

Deficiencies

Rectifications Implemented

Proposed Additional Control Measures

Surface Water

Intercepting channels & drainage system

Ÿ   Reviewed drainage plan.

Ÿ   Addition of channels.

Ÿ   Expedite the construction of permanent sediment trap and discharge culverts.

 

DP channels (design & regular silt removal)

Ÿ   Carried out regular maintenance and cleaning of channels.

Ÿ   DP4 channel: Area near the channel was paved with concrete and a bund was built.

Ÿ   DP6 channel: Gravel piles on the channel were covered with concrete which serve as blocks for running water and to divide the channel into several sections. A pump was placed in the water zone in the upstream section to pump water to the Wetsep for treatment prior to the discharge to the last section before the weir plate.  

Ÿ   DP6: Pipes through the gravel piles between different channel sections were covered with geotextiles to block debris and silt.

 

N.A.

Stockpiles & exposed soil

Ÿ   Installed silt fencing near surface water channel along DP6 channel.

Ÿ   Improve soil covering.

Ÿ   Compaction and cover for stockpiles and soil slopes.

 

Wetsep (treatment capacity & number)

Ÿ   Reviewed Wetsep capacity.

Ÿ   Chemicals dosage of the Wetsep was increased to enhance the efficiency.

Ÿ   Install additional Wetsep.

Backflow / ponding during heavy rainfall

Ÿ   Raised with EPD (LDG) and CEDD.

N.A.

2.6                            Waste Management Status

The Contractor has registered as chemical waste producer under the Contract.  Sufficient numbers of receptacles were available for general refuse collection and sorting.

As informed by the Contractor, waste generated during this reporting period include mainly non-inert C&D materials.  Reference has been made to the waste flow table prepared by the Contractor.  The quantities of different types of wastes and imported fill materials are summarised in Table 2.11.

Table 2.11      Quantities of Different Waste Generated and Imported Fill Materials

Month/

Year

Inert C&D Materials (a)
(in 000m3)

Imported Fill
(in 000kg) (b)

Inert Construction Waste Re-used
(in 000m3)

Non-inert Construction Waste (c)
(in 000m3)

Recyclable Materials (d)  (in 000kg)

Chemical Wastes
(in 000kg)

Rock

Soil

1 31 March 2020

0.093

0

0

0

0.138

0

0

Notes:

(a)      Inert construction wastes include hard rock and large broken concrete, and materials disposed as public fill.  Density assumption: 1.6 (kg/L) for public fill.

(b)      Imported fill refers to materials generated from other project for on-site resue.

(c)      Non-inert construction wastes include general refuse disposed at landfill. Density assumption: 0.9 (kg/L) for general refuse.

(d)      Recyclable materials include metals, paper, cardboard, plastics and others.

2.7                            Implementation Status of Environmental Mitigation Measures

A summary of the Environmental Mitigation Implementation Schedule is presented in Annex B.  The necessary mitigation measures were implemented properly for the Project.

2.8                            Summary of Exceedances of the Environmental Quality Performance Limit

The 24-hour TSP monitoring results and construction noise monitoring results complied with the Action and Limit Levels in the reporting periodImpact surface water quality monitoring could not be carried out for all the scheduled events during the reporting period due to insufficient flow.

Cumulative statistics on exceedances is provided in Annex G.

2.9                            Summary of Complaints, Notification of Summons and Successful Prosecutions

There were no complaints, notification of summons or prosecution recorded in the reporting period.

Statistics on complaints, notifications of summons, successful prosecutions are summarised in Annex G.

 

3                                 Future Key Issues

3.1                            Construction Programme for the Coming Month

As informed by the Contractor, the major works for the Project in April 2020 will be:

Ÿ  Excavation and removal of unsuitable fill materials;

Ÿ  Remaining site formation works at Area X1;

Ÿ  Filling of perimeter bund for Cell 2X;

Ÿ  Placing leachate stones at Cell 2X;

Ÿ  Construction of buttress wall;

Ÿ  Construction of perimeter wall and plinths at LTP area;

Ÿ  Building services and fitting-out works for bioplant;

Ÿ  Installation of ammonia stripping plant with pipe work and control panel room at LTP area;

Ÿ  Installation of other LTP tanks and equipment;

Ÿ  Installation of pipes and cables on pipe racks;

Ÿ  Building service and fitting-out works at new infrastructure buildings;

Ÿ  Pavement works at landfill gas plant area;

Ÿ  Building service and fitting-out works at landfill gas plant buildings;

Ÿ  Construction of perimeter bund channel;

Ÿ  Construction of groundwater pipe along Eastern side from Cell 3X to 4X;

Ÿ  Construction of superstructure at maintenance building;

Ÿ  Installation of monitoring wells;

Ÿ  Construction of pits and ducting for underground utilities;

Ÿ  Construction of superstructure of fire service tank room and water services room;

Ÿ  Enhancement of the external slope surface of perimeter bund of Cell 1X and 2X;

Ÿ  Installation of gas and leachate HDPE pipe;

Ÿ  Construction of sump houses; and

Ÿ  Construction of diesel fuel tank.

3.2                            Key Issues for the Coming Month

Potential environmental impacts arising from the above upcoming construction activities in the next reporting period of April 2020 are mainly associated with the potential surface water impact in the rainy season.  The ET will keep track on the construction works to confirm compliance of environmental requirements and the proper implementation of all necessary mitigation measures.

3.3                            Monitoring Schedule for the Coming Month

The tentative schedules for environmental monitoring in April 2020 are provided in Annex H.

 

4                                 Conclusion and Recommendation

This EM&A Report presents the findings of the EM&A activities undertaken during the period from 1 to 31 March 2020 in accordance with the updated EM&A Manual and the requirements of the Environmental Permit (EP-308/2008/B).

Air quality (24-hour TSP), noise and water quality (DO, pH and SS) monitoring were carried out in the reporting period.  Results for air quality monitoring (24-hour TSP) complied with the Action and Limit Levels in the reporting period.  No Action and Limit Levels exceedances were recorded for construction noise monitoring.  Impact surface water quality monitoring could not be carried out for all the scheduled events during the reporting period due to insufficient flow.

Environmental site inspections were carried out during the reporting period.  Recommendations on remedial actions were given to the Contractor for the deficiencies identified during the site inspections.

There were no complaints, notification of summons or prosecution recorded in the reporting period.

The ET will keep track on the construction works to confirm compliance of environmental requirements and the proper implementation of all necessary mitigation measures.

 

 



([1])     ERM (2018).  South East New Territories (SENT) Landfill Extension: Environmental Monitoring & Audit Manual

([2])     ERM (2007).  South East New Territories (SENT) Landfill Extension Feasibility Study: Environmental Impact Assessment Report