Background
1.1
Maunsell Environmental Management Consultants Limited
(MEMCL), which changed the name to ENSR Asia (HK) Ltd. (ENSR) on 1 May 2007 was
commissioned by Paul Y. – CREC(HK) Joint Venture to undertake the Environmental
Monitoring and Audit (EM&A) works for the construction phase of the Temporary
Construction Waste Sorting Facility (CWSF) at Tseung Kwan O Area 137 (TKO 137) (hereafter
called “the Project”).
1.2
An Environmental Permit (No.: EP-134/2002/F) was granted to
the Project on 26 January 2006.
The scale and scope of this project as stated in the EP include:
·
Site
clearance;
·
Construction
of a temporary storm water system;
·
Stockpiling
of 6 million m3 of public fill;
·
Setting
up two barging points: one at the Tseung
Kwan O
Basin (TKO Basin)
and one at the Construction and Demolition Material Sorting Facility
(C&DMSF) for transporting the stockpiled public fill by barges;
·
Setting
up a temporary barging point at the existing Explosives Off-loading Barging
Point located in the south-eastern part of Area 137 for the period of May 2004
to December 2004 for transporting the stockpiled public fill by barge;
·
Construction
and operation of a C&DMSF;
·
Setting
up a Construction and Demolition Material Crushing Facility at the TKO Basin;
and
·
Remove the temporary fill bank.
1.3
Under the EP, construction and operation of the construction
and demolition material sorting facility is within the scope. Therefore, the
said activities in the temporary CWSF in TKO 137 are under the governance of
the EP.
1.4
In accordance with the Particular Specification of the Project,
baseline monitoring was not required. However, the baseline conditions as well
as action and limit levels of the Project was established based on the baseline
data collected by Fill Bank at TKO 137.
Scope of Report
1.5
This is the thirty-seventh monthly Environmental Monitoring
and Audit (EM&A) Report under Contract CV/2004/13 – Temporary Construction
Waste Sorting Facilities at Tseung Kwan O Area 137 and Tuen Mun Area 38. This
report presents a summary of the environmental monitoring and inspection works,
list of activities, and mitigation measures carried out by the ET for the temporary
CWSF at TKO 137 in November 2008.
Project Organization
1.6
The project organization is shown in Appendix A.
1.7
The key personnel contact names and numbers are summarised
in Table 1.1
Table 1.1 Contact Information of Key Personnel
|
Party
|
Position
|
Name
|
Telephone
|
Fax
|
|
CEDD
|
Engineer
|
Mr. Lawrence Ng
|
2762 5582
|
2714 0113
|
|
IEC(MateriaLab)
|
IEC
|
Mr.
Joseph Poon
|
2450
8238
|
2450
6138
|
|
Contractor
(Paul Y -CREC(HK) JV)
|
Project
Manager
|
Mr.
Joe Au
|
9378 3331
|
2623 9426
|
|
Site
Agent
|
Mr.
Y T Wong
|
9475
6376
|
--
|
|
ET (ENSR)
|
ET Leader
|
Mr. Y T Tang
|
2893 1551
|
2891 0305
|
Summary of Construction Works
1.8
The construction phase of the Project commenced on 12 November 2005. As
informed by the Contractor, the activities during this reporting month
included:
l
Operation of Combined Reception and Exit Office
(CREO);
l
Operation
of Construction Waste Sorting Facilities (CWSF) by mechanical sorting plant;
l
Disposal
of sorted waste to Landfill and Fill Bank;
l
Maintenance
work for haul road; and
l
Operation
of sorting facility at Area B3 and Area A2.
1.9
The general layout plan of the Project sites showing the
contract areas are shown in Figure 1.1.
1.10
The construction programme is provided in Appendix B.
Summary of EM&A Requirements
1.11
Air quality monitoring is required under the Particular
Specification of the Project. The description and detailed monitoring
requirements for air quality are provided in Section 2 of this Report.
1.12
Environmental site inspection is required by the ET on a
weekly basis. Detailed inspection requirements are provided in Section 3 of
this Report.
Monitoring Requirements
2.1
In
accordance with the Particular Specification of the Project, ET is required to
conduct 1-hr and 24-hr TSP monitoring at the temporary CWSF in TKO 137 during
the construction and operation periods to ensure the activities in the Project
does not generate dust which exceeds the acceptable level. Appendix C shows the
Action and Limit Levels for the environmental monitoring works.
Monitoring
Equipment
2.2
High volume sampler (HVS - Model GS-2310 Accu-vol) complete
with the appropriate sampling inlets was installed for 24-hr TSP sampling. The
HVS is composed of a motor, a filter holder, a flow controller and a sampling
inlet and its performance specification complies with USEPA Standard Title 40,
Code of Federation Regulations Chapter 1 (Part 50 Appendix B). A portable dust
meter was used for the 1-hr TSP monitoring. Table 2.1 summarises the equipment
used.
Table 2.1 Air Quality Monitoring Equipment
|
Equipment
|
Model
|
|
HVS
|
GS 2310
Accu-vol system
|
|
Calibrator
|
GMW 25
|
|
1-hour TSP Dust Meter
|
Laser Dust
Monitor – Model LD-3
|
|
Calibrator – Dust Meter
|
Rupprecht & Patashnick TEOM®
|
Monitoring Parameter, Frequency and Schedule
2.3
The monitoring parameters and frequency are summarised in
Table 2.2. The monitoring schedule for the reporting period is shown in
Appendix D.
Table 2.2 Frequency of Air Quality Monitoring
|
Parameters
|
Frequency
|
|
24-hour TSP
|
Once/week
|
|
1-hour TSP
|
Three times/week
|
Monitoring Locations
2.4
The location for the air quality monitoring station TKO2 is
provided in Table 2.3 and depicted in Figure 2.1.
Table 2.3 Air Quality Monitoring Stations
|
Station
ID
|
Identity/Description
|
|
TKO2
|
Combined Reception & Exit Office in Area B1
|
Monitoring Methodology
24-hour TSP Monitoring
Operating/Analytical Procedures
2.5
Operating/analytical procedures for the
operation of HVS are as follows:
·
The
sampler was placed on a horizontal platform with appropriate supporting
structure such that:
-
no
two samplers were placed less than 2 metres apart.
-
the
distance between the sampler and an obstacle, such as buildings, was at least
twice the height that the obstacle protrudes above the sampler.
-
a
minimum of 2 metres separation from walls, parapets and penthouses was required
for the rooftop samplers.
-
a
minimum of 2 metres separation from any supporting structure, measured
horizontally was required.
-
airflow
around the sampler was unrestricted.
-
no
furnaces or incineration flues were operating near the sampler.
-
the
sampler was more than 20 metres from the dripline.
-
Any
wire fence and gate, to protect the sampler, should not cause any obstruction
during monitoring.
·
Prior
to the commencement of the dust sampling, the flow rate of the high volume
sampler was properly set (between 1.1 m3/min. and 1.4 m3/min.)
in accordance with the manufacturer's instruction to within the range
recommended in USEPA Standard Title 40, CFR Part 50.
·
For
TSP sampling, fibreglass filters (G810) were used [Note: these filters have a
collection efficiency of > 99% for particles of 0.3 mm diameter].
·
After
sampling, the filter was transferred from the filter holder of the HVS to a
sealable plastic bag and sent to the laboratory for weighing. The elapsed time
was also recorded.
·
Before
weighing, all filters were conditioned for 24 hours before weighing under
temperature of 25°C ±3°C and the relative humidity (RH) < 50% ±5%,
preferably 40%.
·
All
measurement procedures in section 4.3 to 4.9 of the EM&A Manual were
followed during the reporting period.
Maintenance
2.6
Proper maintenance would be provided for
the HVS:
·
The
HVS motors and their accessories have been properly maintained. Appropriate
maintenance such as routine motor brushes replacement (time interval for
replacement is about 500 hours) and electrical wiring checking have been
conducted to ensure that the equipment and necessary power supply were in good
working condition.
1-hour TSP Monitoring
Measuring
Procedures
2.7
The sampler was placed with appropriate
supporting structure. The requirements of the location of the sampler were the
same as HVS and were presented in Section 2.5 of this report.
2.8
The measuring procedures of the 1-hour dust
meter were in accordance with the Manufacturer’s Instruction Manual as follows:
·
Set
POWER to “ON”, push BATTERY button, make sure
that the meter’s indicator is in the range with a red line and allow the
instrument to stand for about 3 minutes (Then, the air sampling inlet has been
capped).
·
Push
the knob at MEASURE position.
·
Push
“O-ADJ” button. (Then meter’s indication is 0).
·
Push
the knob at SENSI ADJ position and set the meter’s indication to S value
described on the Test Report using the trimmer for SENSI ADJ.
·
Pull
out the knob and return it to MEASURE position.
·
Push
“START” button.
·
All
measurement procedures in section 4.3 to 4.9 of the approved EM&A Manual were
followed during the impact monitoring period.
Maintenance
2.9
Air suction inlet was normally closed
unless in operation. Regular cleaning of the air suction inlet was provided.
Wind Data
2.10
Historically, the meteorological data for Fill Bank
operations at the site was obtained from the in-situ wind station for TKO 137 under
previous contracts. Therefore, such practice would be maintained to ensure
consistence of meteorological data for the contract in the Fill Bank.
Calibration Details
24-hour TSP Monitoring
2.11
The
HVS was calibrated upon installation on site and prior to commissioning. Subsequent
calibration would be provided at 2-month intervals using GMW-25 Calibration
Kit. The flow rate of the HVS with mass flow controller was calibrated using an
orifice calibrator. Five-point calibration was adopted.
2.12
The HVS was calibrated on 20 October 2008 Calibration
details are provided in Appendix E. The next calibration will be conducted by 20
December 2008.
1-hour TSP Monitoring
2.13
The 1-hour TSP meters were checked at 3-month intervals to
confirm normal operation of the equipment and calibrated at 1-year interval
throughout all stages of the air quality impact monitoring.
2.14
The 1-hour TSP meters were
calibrated on 16 June 2008 and the next calibration will be conducted by 14
June 2009.
Results and Observations
2.15
In the reporting month, all the 1-hr and 24-hr TSP
monitoring events were carried out in accordance with the schedule.
2.16
The actual monitoring program for November 2008 is presented
in Appendix D. All monitoring data and graphical presentations of the
monitoring results are provided in Appendix F. Table 2.4 lists out all 1-hr TSP
monitoring results and Table 2.5 lists out all the 24-hr TSP monitoring results.
Table 2.4 Summary of 1-hr TSP Monitoring Results
|
Date
|
TKO2
|
Monitoring Status
|
|
1st 1-hr TSP
(mg/m3)
|
2nd 1-hr TSP
(mg/m3)
|
3rd 1-hr TSP
(mg/m3)
|
Exceedance1
|
|
06/11
|
80.9
|
82.1
|
83.0
|
X
|
Regular
|
|
12/11
|
90.2
|
84.6
|
87.5
|
X
|
Regular
|
|
18/11
|
92.8
|
90.6
|
89.3
|
X
|
Regular
|
|
29/11
|
110.6
|
111.2
|
112.5
|
X
|
Regular
|
1. L – limit level exceedance; A - action level exceedance; X – not an
exceedance
Table 2.5 Summary of 24-hr TSP Monitoring Results
|
Date
|
TKO2
|
Monitoring Status
|
|
24-hr TSP
(mg/m3)
|
Exceedance1
|
|
5/11
|
107.8
|
X
|
Regular
|
|
11/11
|
156.7
|
X
|
Regular
|
|
17/11
|
175.1
|
X
|
Regular
|
|
28/11
|
152.8
|
X
|
Regular
|
1.
L – limit level exceedance; A - action level exceedance; X – not an
exceedance
2.17
There was no exceedance of 1-hour and
24-hour TSP monitoring recorded in the reporting month.
2.18
Besides the construction activities
inside the Project site, other potential dust sources included the dump truck
traffic, dumping and manual sorting of inert waste inside the Fill Bank of TKO 137.
2.19
Wind data, including wind speed and wind direction, are
annexed in Appendix G.
3. ENVIRONMENTAL SITE INSPECTION
3.1
Environmental site inspections are required to inspect
the construction activities and operation of the temporary CWSF in order to
ensure that appropriate environmental protection and pollution control
mitigation measures are properly implemented.
3.2
There
were 4 site inspections conducted in November 2008 for the temporary CWSF at
TKO 137 on 5, 12, 17 and 26 November 2008.
Site Inspections
3.3
Site
inspections were carried out by ET to monitor the implementation of proper
environmental pollution control and mitigation measures for the Project. After
the site inspection, the Contractor was notified of the ET’s observations and
recommendations. A corrective action plan detailing the environmental
observations had also been prepared by the ET. The Contractor then completed
this plan to propose/report their remedial works. This corrective action plan
submission procedure was adopted for each subsequent ET’s inspection to notify
all the relevant parties of the Contractor’s follow up actions. The site
inspection summaries are attached in Appendix H. Particular observations are
described as follows:
Air Quality
·
Dump
trucks were observed leaving the site without covering the load by impervious
sheet. The Contractor was reminded to entirely cover the load on vehicle by
clean impervious sheet before leaving the site.
·
Minor
fugitive dust was observed when dump trucks moved along the haul road in Area
A2. The Contractor was reminded to sufficiently dampen the road.
·
Automatic wheel washing facilities were installed at
the site egress of the Project.
·
Vehicles
were travelling below the speed limit in the temporary CWSF. There were
sufficient speed limit signs on site to advise the drivers.
Noise
·
The
major noise source was vehicle movement in the temporary CWSF. Since the nearby
NSRs were remote from the temporary CWSF, the noise impact was minimal. There
was no specific observation noted regarding noise issue.
Water Quality
·
Deposited silt and general refuse were observed
accumulated inside the u-channel and along the roadside of haul road in Area
B2. The Contractor was reminded to clear the silt and general refuse regularly.
·
Besides
the afore-said issues, it was recommended to arrange maintenance for the silt
traps at the wheel washing bays before and after rainstorms so as to ensure
their maximum treatment capacities.
Chemical and
Waste Management
·
The
Contractor provided waste skips to collect general refuse and would dispose of
them regularly to the SENT Landfill.
Landscape and
Visual
·
Hoarding
was erected at the site egress and aligned along the site boundary in
connection with the Fill Bank at TKO 137.
Review of Environmental Monitoring
Procedures
3.4
The
monitoring works conducted by the ET were inspected regularly. The observations
for the monitoring works were recorded and summarised as follows:
·
The
monitoring team recorded the observations around the monitoring stations within
and outside of the construction site.
·
The
monitoring team recorded the temperature, air pressure and general weather
condition on the monitoring day.
Assessment of Environmental Monitoring
Results
3.5
All
monitoring results were audited against the A/L levels and any exceedances
would be validated.
3.6
The
monitoring results in this reporting period were comparable with the established
action and limit levels.
Advice on the Solid and Liquid Waste
Management Status
3.7
As advised by the Contractor, there were disposal of
sorted inert material, sorted non-inert material, chemical waste and non-inert
C&D waste in the reporting month. The actual amounts of different types of waste generated by the
activities of the Project in the month are shown in Table 3.1.
Table 3.1 Actual
Amounts of Waste Generated in November 2008
|
Waste Type
|
Actual Amount
|
Disposal Locations
|
|
Public fill
collected
|
47587.38 ton
|
-
|
|
Sorted waste (inert material)
|
10469.42 ton
|
TKO Fill Bank
|
|
Sorted waste (non-inert material)
|
55002.31 ton
|
SENT Landfill
|
|
Recycling (Metal)
|
0 ton
|
Recycling companies
|
|
Non-inert C&D
waste
|
1.46 ton
|
SENT Landfill
|
|
Inert C&D
waste
|
0 ton
|
TKO Fill Bank
|
|
Chemical waste
|
0.2 L
|
Chemical Waste Treatment Centre
|
3.8
The
Contractor should provide sufficient drip trays for all the oil drums/chemical
containers. Besides, these drip trays should be covered by tarpaulin sheet to
minimize rainfall accumulation.
3.9
The
Contractor should use suitable containers with proper labels to store chemical
wastes inside a designated chemical waste store in accordance with Code of Practice
on the Packaging, Labelling and Storage of Chemical Wastes. The Contractor
should also advise their workers of the proper procedures in handling the
chemical waste. All the trip
tickets for chemical waste disposal were properly kept in the site office. Disposal
of chemical waste was undertaken in the reporting month.
3.10
The
Contractor should provide sufficient preventive measures during equipment
maintenance works so as to avoid oil leakage on the ground. In the event of any
oil leakage, the Contractor should clean up the polluted soil and handle all
the materials using for this cleaning works as chemical waste.
Environmental Licences and Permits
3.11 No new
environmental license and permit was obtained in the reporting month.
3.12 The
status of all permits/licences obtained/in use during the reporting period are
summarised in Table 3.2.
Table 3.2 Summary
of Environmental Licensing and Permit Status
|
Description
|
Permit No.
|
Valid Period
|
Remarks
|
|
From
|
To
|
|
Environmental Permit
|
EP-134/2002/F
|
26/1/06
|
-
|
(Valid)
·
Site
clearance
·
Construction
of a temporary storm water system
·
Stockpiling
of 6 million m3 of public fill
·
Setting
up two barging points for transporting the stockpiled public fill by barges
·
Setting
up a temporary barging point at the existing Explosive Off-loading Barging
Point for the period of May 2004 to December 2004 for transporting the
stockpiled public fill by barge
·
Construction
and operation of a Construction and Demolition Material Sorting Facility
(C&DMSF)
·
Setting
up a Construction and Demolition Material Crushing Facility at the TKO Basin
·
Remove
the temporary fill bank
|
|
Registration as
a Chemical Waste Producer
|
5213-839-P2896-01
|
25/1/06
|
--
|
(Registered)
|
|
Certificate of
Approval – Air Pollution Control (Furnaces, Ovens and Chimneys) (Installation
and Alteration) Regulations
|
--
|
4/9/06
|
--
|
(Approved)
|
|
Effluent
Discharge License
|
RE/D1180/839/1
|
13/11/06
|
30/11/11
|
(Valid)
|
Implementation Status of Environmental
Mitigation Measures
3.13 An
updated summary of the Environmental Mitigation Implementation Schedule (EMIS)
is presented in Appendix I. Most of the necessary mitigation measures were
implemented properly. Any deficiencies were noted in the remarks of the
schedule.
Summary of Exceedances of the Environmental
Quality Performance Limit
3.14 There
was no exceedance of 1-hour and 24-hour TSP monitoring recorded in the
reporting month.
3.15 The
event action plans are attached in Appendix J.
Summary of Complaints, Notifications of
Summons and Successful Prosecutions
3.16
No
complaint, notification of summons and prosecutions was received in the
reporting month. A summary of environmental complaints and prosecutions was
given in Table 3.3 and the cumulative statistics of complaints is presented in
Appendix M.
Table 3.3 Summary of Environmental Complaints and Prosecutions
|
Complaints logged
|
Summons served
|
Successful Prosecution
|
|
November 2008
|
Cumulative
|
November 2008
|
Cumulative
|
November 2008
|
Cumulative
|
|
0
|
24
|
0
|
0
|
0
|
0
|
4. FUTURE
KEY ISSUES
Construction Programme for the Coming Months
4.1
The construction programme for the Project is shown in
Appendix B.
4.2
The activities to be conducted in the next two months included:
l
Operation of Combined Reception and Exit Office
(CREO);
l
Operation
of Construction Waste Sorting Facilities (CWSF) by mechanical sorting plant;
l
Disposal
of sorted waste to Landfill and Public Fill Reception Facilities;
l
Maintenance
work for haul road; and
l
Operation
of Area B3 and Area A2.
Key Issues for Coming Month
4.3
Key issues to be considered in the coming month include:
·
Removal of non-inert waste stockpile
at Area A2;
·
Chemical and waste management;
·
Treatment of runoff and wastewater prior to discharge;
·
Dust generated from loading and unloading activities; and
·
Dust generated from dump trucks traffic.
4.4
The following mitigation measures are required:
Air Quality
Impact
·
To
prohibit any open burning on site;
·
To
provide adequate water spraying on haul roads and working platforms;
·
To
operate and maintain automatic wheel washing facilities properly;
·
To
dampen the fill material prior to unloading or movement;
·
To
provide road sweeping on all paved haul roads and the public roads outside site
egress;
·
To
provide proper maintenance for equipment and vehicles on site;
·
To
ensure implementation of the dust mitigation measures for the construction
activities, if any;
·
To
maintain proper operation of the mist spraying systems;
·
To
ensure vehicle speed below 10 km/hr in the temporary CWSF;
·
To
investigate any other dust sources around the air sensitive receivers; and
·
To
follow up any exceedance, if any, caused by the temporary CWSF operation.
Noise Impact
·
To
identify the noise sources inside and outside of the site;
·
To
follow up any exceedance caused by the temporary CWSF operation;
·
To
switch off equipment if not in use;
·
To
operate silent equipment; and
·
To
re-schedule the work activities in the event of valid noise exceedance.
Water Quality
Impact
·
To
operate and maintain the wastewater treatment facility for the site toilet;
·
To
provide covers for the drip trays to avoid stagnant water ponding due to
rainfall;
·
To ensure cleanliness of oil interceptor bypass tank
and all the drainage channels;
·
To
maintain the existing silt trap to ensure sufficient treatment of wheel wash
water frequently;
·
To
maintain the drainage system in the temporary CWSF; and
·
To
avoid formation of any stagnant water or provide insecticide to avoid mosquito
breeding in the temporary CWSF.
Chemical and Waste
Management
·
To
remove waste from the site regularly;
·
To
properly store and handle chemical wastes on site;
·
To
implement trip ticket system for all the imported public fill and general
refuse disposal;
·
To
provide and manage sufficiently sized drip trays for diesel drums or chemical
containers;
·
To
maintain proper housekeeping at the workshop area;
·
To
provide all the preventive measures during equipment maintenance;
·
To
remove the oil stains in the event of leakage and handle all the materials
using for this cleaning works as chemical waste; and
·
To
identify C&D material by packaging, labelling, storage, transportation and
disposal in accordance with statutory regulations.
Monitoring Schedule for the Coming Months
4.5
The tentative schedule for environmental monitoring
programme for December 2008 is shown in Appendix L.
Conclusions
5.1
Environmental monitoring of air quality (1-hr TSP and 24-hr
TSP) for the Project was performed in November 2008. There was no
exceedance of 1-hour and 24-hour TSP monitoring recorded in the reporting month.
5.2
Environmental
site inspections were conducted 4 times in the reporting month. Deposited silt and
general refuse were observed accumulated inside the u-channel and along the
roadside of haul road in Area B2. The Contractor was reminded to clear the silt
and general refuse regularly.
The Contractor was also reminded
to entirely cover the load on vehicle by clean impervious sheet before leaving
the site and sufficiently dampen the haul road.
5.3
No complaint, non-compliance, notifications of summons or
prosecutions was received in the reporting month.
Recommendations
5.4
According to the environmental site inspections performed in
the reporting month, the following recommendations were provided:
Air Quality
·
Ensure the frequency of water spraying on haul roads,
unloading areas and stockpiles to be sufficient to suppress the dust sources;
·
Provide proper maintenance for the powered mechanical
equipment and barges to avoid emission of dark smoke;
·
Provide water spraying onto the truckloads during inspection
of fill material;
·
Conduct road sweeping on the public
road and the main haul roads outside and near the site egress by the road
sweeper;
·
Undertake water spraying on
stockpiling area by water bowers;
·
Erect adequate speed limit signs to
advise the truck drivers of the speed limit;
·
Operate mist spraying systems and automatic water sprinklers
in the temporary CWSF;
·
Implement
the dust mitigation measures for the construction activities;
·
Designate proper haul roads to ensure effective water
spraying; and
·
Ensure all vehicles to be washed before leaving the site
egress by provision, operation and maintenance of automatic wheel washing
facilities.
Construction Noise
·
Conduct noisy activities at a farther location from the NSR.
Water Quality
·
Maintain the drainage system, including the trapezoidal
channels;
·
Operate and maintain the treatment system for the site
toilet; and
·
Remove the stagnant water or provide pesticide for the
stagnant water in the permanent desilting chambers, if any.
Chemical and Waste Management
·
Remove waste materials from site regularly to avoid
accumulation;
·
Handle and store chemical wastes properly;
·
Remove unwanted material in the existing stockpiles and
avoid further dumping of such material;
·
Provide and maintain sufficient drip trays for diesel drums,
chemical containers, chemical waste storage drums and diesel operated generator
set;
·
Maintain good housekeeping at the workshop area;
·
Ensure sufficient tarpaulin sheets are provided to cover
drip trays;
·
Avoid soil being polluted during oil filling and equipment
maintenance; hence, properly remove and store the contaminated soil, if any,
and
·
Provide a proper chemical waste store.
Landscape and Visual
·
Erect all the site hoardings/chaining fences in accordance
with agreed design at proper location.
