Project
Background
1.01
The Leader Civil Engineering Corporation Limited (Leader) has been
awarded the Contract DC/2009/13 -
Construction of Sewage Treatment Works at Yung Shue Wan and Sok Kwu Wan
(the Project) by the Drainage Services Department (DSD) on 4 May 2010. The Project is part of an overall
plan approved under a statutory EIA for Outlying Islands Sewerage Stage 1 Phase
2 Package J – Sok Kwu Wan Sewage Collection and Treatment (Register No.
AEIAR-075/2003) and Disposal Facilities and Outlying Islands
Sewerage Stage 1 Phase 1 Package C – Yung Shue Wan Sewage Treatment Works and
Outfall (Register No. EIA-124/BC).
The Environmental Permit (EP) No. EP-281/2007 and EP-282/2007 for the
Project have been obtained by the DSD on 29 June 2007 for the relevant
works. After July 2009,
EP-281/2007/A stead EP-281/2007 is EP for Sok Kwu Wan relevant works.
1.02
The Project involves construction of sewage treatment works at Sok
Kwu Wan and Yung She Wan with a capacity of 1,430m3/day and 2,850m3/day respectively to provide secondary treatment,
construction of 2 pumping stations at Sok Kwu Wan and 1 pumping station at Yung
Shue Wan, construction of submarine outfall from the coastline and lying of
underground sewerage pipeline. The
site layout plan for the captioned work under the Project is showing in Appendix
A.
1.03
According to the Particular Specification (PS) and Appendix
25 of the Project, Leader should establish an Environmental Team (ET)
to implement the environmental monitoring and auditing works to fulfill the
requirements as stipulated in the Environmental Monitoring and Audit (EM&A)
Manual. This EM&A Manual is
referred to the Appendix B of the Review Report on EIA Study – Sok Kwu Wan
(Final) in January 2007 (Agreement No. CE 20/2005(DS)).
1.04
Action-United Environmental Services and Consulting (AUES) has
been commissioned by Leader as the ET to implement the relevant EM&A
programme. Organization chart of
the Environmental Team for the Project is shown in Appendix B. For ease of reporting, the proposed
EM&A programme for baseline and impact monitoring is spilt to following two
stand-alone parts:
(a)
Proposed EM&A Programme for Baseline and Impact Monitoring –
Sok Kwu Wan (under EP No. 281/2007/A varied on 23 September 2009)
(b)
Proposed EM&A Programme for Baseline and Impact Monitoring –
Yung Shue Wan (under EP No. 282/2007)
1.05
According
to the EM&A Manual of Sok Kwu Wan and Yung
Shue Wan, baseline water quality monitoring should be carried out for consecutive six months before the marine
work commencement. Therefore, the baseline reports of Sok Kwu
Wan and Yung Shue Wan are divided to two volumes i.e. the Volume 1 for air
quality and noise monitoring; and the Volume II for water quality monitoring
for separate submission.
1.06
There is a concurrent DSD contract “DC/2007/18 Yung Shue Wan and Sok Kwu Wan Village Sewerage, Stage 1 Works” undertaking at Sok Kwu Wan since April 2008.
1.07
Consider that the construction works of DC/2007/18 and DC/2009/13
at Sok Kwu Wan is under the same Environmental Permit and EM&A Manual, the
performance criteria of air quality and construction noise at Sok Kwu Wan under the Project is recommended to adopt the Action/Limit Levels
established by contract DC/2007/18.
The Baseline Monitoring Report Volume 1
under the Project for air quality and noise at Sok Kwu Wan was submitted on 9
July 2010 and verified by IEC and for EPD
endorsement before the relevant land works commencement on 27 July 2010.
1.08
This
is the 23rd
monthly EM&A Report – Sok Kwu Wan Portion Area presenting the
monitoring results and inspection findings for the Reporting Period from 26 May to 25 June 2012.
Report
Structure
1.09
The
Monthly Environmental Monitoring and Audit (EM&A) Report – Sok Kwu Wan is
structured into the following sections:-
Section 1 Introduction
Section 2 Project
Organization and Construction Progress
Section
3 Summary of Monitoring
Requirements
Section 4 Air
Quality Monitoring Results
Section 5 Construction
Noise Monitoring Results
Section 6 Water
Quality Monitoring Results
Section 7 Waste
Management
Section 8 Site
Inspections
Section 9 Environmental
Complaints and Non-Compliance
Section 10 Implementation Statues of Mitigation Measures
Section 11 Impact Forecast
Section
12 Conclusions and Recommendation
Project Organization and Management Structure
2.01
Organization
structure and contact details of relevant parties with respect to on-site
environmental management are shown in Appendix B.
Construction
Progress
2.02
The
master and three month rolling construction programme are enclosed in Appendix C and the major construction
activities undertaken in this Reporting Period are listed below:-
l
Construction of Pumping Station No. 1& 2
l
Dredging
of SKW Submarine Outfall
Summary
of Environmental
Submissions
2.03
Summary of
the relevant permits, licences, and/or notifications on environmental
protection for this Project in this Reporting Period is presented in Table 2-1.
Table 2-1 Status of Environmental Licenses and
Permits
|
Item
|
Description
|
License/Permit Status
|
|
1
|
Air Pollution Control (Construction Dust) Regulation
|
Notified EPD on 19 May 2010
Ref.: 317486
|
|
2
|
Chemical Waste Producer Registration
|
Issued on 8/6/2010
WPN 5213-912-L2720-01
|
|
3
|
Water Pollution Control Ordinance
|
Approved on 29/9/2010
Valid to: 30/09/2015
Licence no.: WT00007567-2010
|
|
4
|
Billing Account for Disposal of Construction Waste
|
Issued on 26 May 2010
A/C No: 7010815
|
|
5
|
Construction Noise Permit
|
Permit no. GW-RS0284-12
Valid from: 26 Mar 2012
Until: 25 Sep 2012
|
2.04
The
“Baseline/Impact Monitoring Methodology (TCS00512/09/600/R0010Ver.4)” was set
out in accordance with the Sok Kwu Wan EM&A Manual’ requirements. It was approved by the Engineer
Representative (ER) and agreed with the Independent Environmental Checker (IEC)
and then submitted to the EPD on 8 July 2010.
2.05
Baseline
Monitoring Report - Volume 1 for Sok Kwu Wan (TCS00512/09/600/R0020Ver.3) was
verified by the IEC on 12 July 2010 and submitted to EPD on 12 July 2010.
2.06
Baseline
Water Quality Monitoring Report - Volume 2 for Sok Kwu Wan
(TCS00512/09/600/R0182v7) was revised against EPD comments and re-submitted on
11 October 2011.
Environmental Aspect
3.01
The EM&A baseline monitoring programme cover the following
environmental issues:
Ÿ
Air quality;
Ÿ
Construction noise; and
Ÿ
Marine water quality
3.02
The ET implements the EM&A programme in accordance with the
aforementioned requirements.
Detailed air quality, construction noise and water quality of the
EM&A programme are presented in the following sub-sections.
3.03
A summary monitoring parameters for the air quality, noise and
marine water monitoring is presented in Table 3-1:
Table 3-1 Summary
of EM&A Requirements
|
Environmental Issue
|
Parameters
|
|
Air Quality
|
•
1-hour TSP Monitoring by Real-Time Portable Dust Meter; and
•
24-hour TSP Monitoring by High Volume Air Sampler.
|
|
Noise
|
•
Leq (30min) during normal working hours; and
•
Leq (15min) during Restricted Hours.
|
|
Marine Water Quality
|
In-situ Measurements
•
Dissolved Oxygen Concentration (DO) (mg/L);
•
Dissolved Oxygen Saturation (% );
•
Turbidity (NTU);
•
pH unit;
•
Salinity (ppt);
•
Water depth (m); and
•
Temperature (ºC).
Laboratory Analysis
Ÿ Suspended Solids (SS) (mg/L)
|
Monitoring Locations
Air Quality
3.04
Three air monitoring stations: AM1, AM2 and AM3 were designated in the EM&A Manual Section 2.5.
The detailed air monitoring stations is described in Table
3-2 and graphical is shown in Appendix D.
Table 3-2 Location
of Air Quality Monitoring Station
|
Sensitive Receiver
|
Location
|
|
AM1
|
Squatter house in Chung Mei
Village
|
|
AM2
|
Squatter house in Chung Mei
Village
|
|
AM3
|
Football court
|
Construction Noise
3.05
According to EM&A Manual
Section 3.4, there were four noise sensitive receivers (NM1-NM4) designated
for the construction noise monitoring.
NM1, NM2 and NM4 of the three designated monitoring stations were
identified and are monitored by the current DSD contract DC/2007/18. However,
the premises monitoring station NM3 was rejected by the owner of 1B Sok Kwu Wan
and an alternative noise monitoring station RNM3 replacement was proposed by
the contract DC/2007/18 ET and accepted by the IEC and EPD before the baseline
monitoring commencement in April 2008.
The location RNM3 is located at Sok Kwu Wan Sitting-out area which just 3m width footpath away from the original
location house 1B. The detailed
construction noise monitoring stations to also under the Project is described
in Table
3-3 and graphical is shown in Appendix D.
Table 3-3 Location
of Construction Noise Monitoring Station
|
Sensitive Receiver
|
Location
|
|
NM1
|
1, Chung Mei
Village
|
|
NM2
|
20, Sok Kwu Wan
|
|
RNM3
|
Sok Kwu Wan Sitting-out Area
|
|
NM4
|
2-storey village house at Ta Shui Wan
|
Water Quality
3.06
Three control stations (C1-C3) and three impact stations (W1-W3)
were recommended in the EM&A Manual
Section 4.5. Impact stations W1-W3
identified at the sensitive receivers (FCZ and secondary contact recreation
subzone) to monitor the impacts from the construction of the submarine outfall
as well as the effluent discharge from the proposed STW on water quality. Three control stations: C1, C2 & C3
were specified at locations representative of the project site in its
undisturbed condition and located at upstream and downstream of the works
area. Detailed and co-ordnance of
marine water quality monitoring stations is described in Table 3-4 and the
graphical is shown in Appendix D and would be performed
for EM&A programme.
Table 3-4 Location
of Marine Water Quality Monitoring Station
|
Station
|
Description
|
Co-ordnance
|
|
Easting
|
Northing
|
|
W1
|
Secondary recreation contact subzone at
Mo Tat Wan
|
832 968
|
807 732
|
|
W2
|
Fish culture zone at Picnic Bay
|
832 670
|
807 985
|
|
W3
|
Fish culture zone at Picnic Bay
|
832 045
|
807 893
|
|
C1 (flood)
|
Control Station
|
833 703
|
808 172
|
|
C2
|
Control Station
|
831 467
|
807 747
|
|
C3 (ebb)
|
Control Station
|
832 220
|
808 862
|
Monitoring Frequency and Period
3.07
The impact monitoring carried out in the
EM&A programme is basically in accordance with the requirements in EM&A Manual Sections 2.7, 3.6, 4.7 and 4.8. The monitoring requirements are listed
as follows.
Air
Quality Monitoring
Parameters: 1-hour TSP and 24-hour
TSP.
Frequency: Once
in every six days for 24-hour TSP and three times in every six days for 1-hour
TSP.
Duration: Throughout
the construction period.
Noise
Monitoring
Parameters: Leq 30min)
& Leq(5min), L10 and L90.
Leq(15min) & Leq(5min), L10
and L90 during the construction undertaken during Restricted hours
(19:00 to 07:00 hours next of normal working day and full day of public holiday
and Sunday)
Frequency: Once
per week during 0700-1900 hours on normal weekdays. Restricted hour monitoring should depend
on conditions stipulated in Construction Noise Permit.
Duration: Throughout
the construction period.
Marine
Water Quality Monitoring
|
Parameters:
|
Duplicate in-situ
measurements: water depth, temperature, dissolved oxygen, pH, turbidity and
salinity;
HOKLAS-accredited laboratory
analysis: suspended solids
|
|
Frequency:
|
Three days a week, at mid ebb
and mid flood tides. The interval between 2 sets of
monitoring will be more than 36 hours.
|
|
Sampling Depth
|
(i.) Three
depths: 1m below
water surface, 1m above
sea bottom and at mid-depth when the water depth exceeds 6m.
(ii.) If the
water depth is between 3m
and 6m, two
depths: 1m below
water surface and 1m above
sea bottom.
(iii.) If the
water depth is less than 3m,
1 sample at mid-depth is taken
|
|
Duration:
|
During the
course of marine works
|
Post-Construction Monitoring – Marine Water
3.08
Upon the marine works
(dredging and HDD pipe installation) completion, 4 weeks of post-construction
monitoring would be undertaken in accordance with the Section 4.8 of EM&A
Manual . The requirements of post-construction
monitoring such as the parameter, frequency, location and sampling depth is
same as the impact monitoring.
Monitoring Equipment
Air Quality Monitoring
3.09
The 24-hour and 1-hour TSP levels shall be measured by
following the standard high volume sampling method as set out in the Title 40 of the Code of Federal Regulations,
Chapter 1 (Part 50), Appendix B. If the ET proposes to use a direct
reading dust meter to measure 1-hour TSP levels, it shall submit sufficient
information to the IEC to approve. The filter paper of 24-hour TSP measurement shall be determined by HOKLAS
accredited laboratory.
Noise Monitoring
3.10
Sound level meter in compliance with the International Electrotechnical Commission
Publications 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications shall
be used for carrying out the noise monitoring. The sound level meter shall be checked
using an acoustic calibrator. The wind speed shall be checked with a portable
wind speed meter capable of measuring the wind speed in m s-1.
Water Quality Monitoring
3.11
Dissolved Oxygen and Temperature Measuring Equipment – The instrument should
be a portable and weatherproof dissolved oxygen (DO) measuring instrument
complete with cable and sensor, and use a DC power source. The equipment should
be capable of measuring as included a DO level in the range of 0 – 20mg L-1 and
0 – 200% saturation; and a
temperature of 0 – 45 degree Celsius.
3.12
pH Meter
– The
instrument shall consist of a potentiometer, a glass electrode, a reference
electrode and a temperature-compensating device. It shall be readable to 0.1 pH in a
range of 0 to 14.
3.13
Turbidity (NTU) Measuring Equipment – The instrument should be a portable and
weatherproof turbidity measuring instrument using a DC power source. It should
have a photoelectric sensor capable of measuring turbidity between 0 - 1000
NTU.
3.14
Water Sampling Equipment – A water sampler should comprise a transparent PVC
cylinder, with a capacity of not less than 2 litres, which can be effectively
sealed with latex cups at both ends. The sampler should have a positive
latching system to keep it open and prevent premature closure until released by
a messenger when the sampler is at the selected water depth.
3.15
Water Depth Detector – A portable, battery-operated echo sounder should be used
for the determination of water depth at each designated monitoring station.
This unit can either be hand held or affixed to the bottom of the work boat.
3.16
Salinity Measuring Equipment – A portable salinometer capable of measuring
salinity in the range of 0 - 40 parts per thousand (ppt) should be provided for
measuring salinity of the water at each monitoring location.
3.17
Sample Containers and Storage – Water samples for suspended solids should be
stored in high density polythene bottles with no preservative added, packed in
ice (cooled to 4°C without
being frozen).
3.18
Monitoring Position Equipment - A hand-held or boat-fixed type digital
Differential Global Positioning System (DGPS) with way point bearing indication
and Radio Technical Commission for maritime (RTCM) Type 16 error message
‘screen pop-up’ facilities (for real-time auto-display of error messages and
DGPS corrections from the Hong Kong Hydrographic Office), or other equipment
instrument of similar accuracy, should be provided and used during marine water
monitoring to ensure the monitoring vessel is at the correct location before
taking measurements.
3.19
Suspended Solids Analysis – Analysis of suspended solids shall be carried out
in a HOKLAS or other international accredited laboratory.
Equipment
Calibration
3.20
Calibration of the HVS is performed upon
installation in accordance with the manufacturer’s instruction using the
NIST-certified standard calibrator (Tisch Calibration Kit Model TE-5025A).
The calibration data are properly documented and the records are
maintained by ET for future reference.
3.21
The 1-hour TSP meter was calibrated by
the supplier prior to purchase.
Zero response of the equipment was checked before and after each
monitoring event. In-house calibration with the High Volume Sampler (HVS) in
same condition was undertaken in yearly basis.
3.22
The sound level meter and calibrator are
calibrated and certified by a laboratory accredited under HOKLAS or any other
international accreditation scheme at yearly basis.
3.23
The
Water Quality Monitoring equipments such as DO meter, pH meter, turbidity measuring instrument
and salinometer, are
calibrated by HOKLAS accredited laboratory of three month intervals.
3.24
All updated calibration certificates of
the monitoring equipment used for the impact monitoring programme in the Reporting
Period would be
attached in Appendix
E.
Meteorological Information
3.25
The meteorological information during
the construction phase is obtained from the Wong Chuk Hang Station of the Hong
Kong Observatory (HKO) due to it nearly the Project site.
Data
Management and Data QA/QC Control
3.26
The
impact monitoring data are handled by the ET’s systematic data recording and
management, which complies with in-house Quality Management System. Standard
Field Data Sheets (FDS) are used in the impact monitoring programme.
3.27
The
monitoring data recorded in the equipment e.g. 1-hour TSP meter, sound level
meter and Multi-parameter
Water Quality Monitoring System, are downloaded directly from the
equipments at the end of each monitoring day. The downloaded monitoring data are input
into a computerized database properly maintained by the ET. The laboratory results are input
directly into the computerized database and QA/QC checked by personnel other
than those who input the data. For
monitoring activities require laboratory analysis, the local laboratory follows
the QA/QC requirements as set out under the HOKLAS scheme for all laboratory
testing.
Reporting
3.28
It was agreed among the ER, IEC, Contractor
and ET that, in order to streamline the EM&A report submission and to cater
for the occasional delay in obtaining laboratory analysis results, the cutoff
day for each month is the 25th i.e. the first day of each report is the 26th
of the last month and the end day, the 25th of that month.
Determination
of Action/Limit (A/L) Levels
3.29
According
to the Sok Kwu Wan Environmental Monitoring and Audit Manual, the air quality,
construction noise and marine water quality were set up, namely Action and Limit
levels are listed in Tables 3-5, 3-6 and 3-7 as below.
Table 3-5 Action and Limit Levels for Air
Quality
|
Monitoring
Station
|
Action
Level (mg/m3)
|
Limit
Level (mg/m3)
|
|
1-hour
|
24-hour
|
1-hour
|
24-hour
|
|
AM1
|
343
|
173
|
500
|
260
|
|
AM2
|
331
|
175
|
500
|
260
|
|
AM3
|
353
|
191
|
500
|
260
|
Table 3-6 Action
and Limit Levels for Construction Noise
|
Monitoring Location
|
Action
Level
|
Limit
Level
|
|
0700-1900 hours on normal weekdays
|
|
NM1
NM2
RNM3
NM4
|
When one or more documented complaints are received
|
75 dB(A) of Leq(30min) during normal
hours from 0700 to 1900 hours on normal weekdays, reduced to 70 dB(A) of Leq(30min) for schools and
65 dB(A) during school examination periods
|
Table 3-7 Action
and Limit Levels for Marine Water Quality
|
Parameter
|
Performance Criteria
|
Impact Station
|
|
W1
|
W2
|
W3
|
|
DO Concentration (Surface and
Middle)
(mg/L)
|
Action Level
|
5.39
|
4.64
|
4.71
|
|
Limit Level
|
5.29
|
4.56
|
4.54
|
|
DO Concentration (Bottom)
(mg/L)
|
Action Level
|
N/A
|
3.60
|
3.37
|
|
Limit Level
|
N/A
|
3.06
|
3.18
|
|
Turbidity (Depth-Average)
(NTU)
|
Action Level
|
4.39
|
4.84
|
6.48
|
|
Limit Level
|
6.06
|
5.99
|
6.71
|
|
Suspended Solids
(Depth-Average)
(mg/L)
|
Action Level
|
12.41
|
9.24
|
10.79
|
|
Limit Level
|
12.68
|
11.28
|
12.25
|
3.30
Should
non-compliance of the environmental quality criteria occurs, remedial actions
will be triggered according to the Event and Action Plan enclosed in Appendix F.
4.01
The impact EM&A programme was carried out as compliance with
the contract Particular Specification, Sok Kwu Wan EM&A Manual and the
EP.
Results of Air Quality Monitoring
4.02
In
this Reporting Period, 54 and 18 monitoring
events were performed for 1-hour TSP and 24-hour TSP monitoring respectively at
the designated locations AM1, AM2 and AM3.
The monitoring results for 24-hour and 1-hour TSP are summarized in Tables
4-1, 4-2 and 4-3. The detail
24-hour TSP data are shown in Appendix G
and the graphical plots of are shown in Appendix H.
Table 4-1 Summary
of 24-hour and 1-hour TSP Monitoring Results – AM1
|
Date
|
24-hour
TSP (mg/m3)
|
1-hour
TSP (mg/m3)
|
|
Date
|
Start Time
|
1st hour measured
|
2nd hour measured
|
3rd hour measured
|
|
26-May-12
|
14
|
28-May-12
|
9:00
|
59
|
57
|
52
|
|
1-Jun-12
|
36
|
1-Jun-12
|
8:00
|
52
|
55
|
60
|
|
7-Jun-12
|
24
|
7-Jun-12
|
8:00
|
59
|
57
|
57
|
|
13-Jun-12
|
29
|
12-Jun-12
|
8:00
|
79
|
77
|
75
|
|
19-Jun-12
|
30
|
18-Jun-12
|
11:00
|
67
|
69
|
62
|
|
25-Jun-12
|
30
|
22-Jun-12
|
8:00
|
64
|
67
|
69
|
|
Average
(Range)
|
27
(14 – 36)
|
Average
(Range)
|
63
(52 – 79)
|
Table 4-2 Summary
of 24-hour and 1-hour TSP Monitoring Results – AM2
|
Date
|
24-hour
TSP (mg/m3)
|
1-hour
TSP (mg/m3)
|
|
Date
|
Start Time
|
1st hour measured
|
2nd hour measured
|
3rd hour measured
|
|
26-May-12
|
36
|
28-May-12
|
11:05
|
55
|
53
|
49
|
|
1-Jun-12
|
55
|
1-Jun-12
|
11:05
|
53
|
59
|
55
|
|
7-Jun-12
|
49
|
7-Jun-12
|
10:15
|
61
|
57
|
53
|
|
13-Jun-12
|
53
|
12-Jun-12
|
10:05
|
68
|
73
|
69
|
|
19-Jun-12
|
69
|
18-Jun-12
|
13:05
|
70
|
74
|
68
|
|
25-Jun-12
|
30
|
22-Jun-12
|
10:05
|
63
|
71
|
65
|
|
Average
(Range)
|
49
(30 – 69)
|
Average
(Range)
|
61
(49 – 74)
|
Table 4-3 Summary
of 24-hour and 1-hour TSP Monitoring Results – AM3
|
Date
|
24-hour
TSP (mg/m3)
|
1-hour
TSP (mg/m3)
|
|
Date
|
Start Time
|
1st hour measured
|
2nd hour measured
|
3rd hour measured
|
|
26-May-12
|
75
|
28-May-12
|
13:30
|
79
|
74
|
72
|
|
1-Jun-12
|
77
|
1-Jun-12
|
13:30
|
80
|
75
|
81
|
|
7-Jun-12
|
51
|
7-Jun-12
|
12:45
|
97
|
101
|
93
|
|
13-Jun-12
|
86
|
12-Jun-12
|
12:30
|
121
|
127
|
124
|
|
19-Jun-12
|
109
|
18-Jun-12
|
15:30
|
151
|
163
|
156
|
|
25-Jun-12
|
49
|
22-Jun-12
|
12:30
|
167
|
174
|
168
|
|
Average
(Range)
|
75
(49 – 109)
|
Average
(Range)
|
117
(72– 174)
|
4.03
As
shown in Tables 4-1, 4-2 and 4-3,
1-hour and 24-hour TSP results fluctuated well below the Action Level during
the Reporting Period.
4.04
The
meteorological information during the impact monitoring days are summarized in Appendix I.
5.01
The
noise monitoring results are presented in the following sub-sections.
Results of Construction Noise Monitoring
5.02
In
this Reporting Period, a total of 16 construction
noise monitoring events were undertaken at designated location NM1, NM2, RNM3
and NM4. The results for Leq30min
at NM1, NM2, RNM3 and NM3 are summarized in Tables 5-1, 5-2, 5-3 and 5-4
and graphical plots are shown in Appendix H.
Table 5-1 Summarized
of Construction Noise Monitoring Results at NM1
|
Date
|
Start Time
|
End time
|
1st Leq5
|
2nd Leq5
|
3rd Leq5
|
4th Leq5
|
5th Leq5
|
6th Leq5
|
Leq30
|
|
28-May-12
|
11:00
|
11:30
|
55.8
|
51.2
|
51.2
|
52.7
|
49.3
|
50.0
|
52.3
|
|
7-Jun-12
|
10:15
|
10:45
|
62.3
|
59.3
|
59.9
|
66.4
|
60.0
|
60.0
|
62.2
|
|
12-Jun-12
|
11:00
|
11:30
|
58.1
|
54.4
|
58.7
|
54.1
|
48.1
|
51.5
|
55.5
|
|
18-Jun-12
|
14:00
|
14:30
|
60.3
|
56.9
|
55.4
|
49.0
|
48.4
|
49.6
|
55.5
|
|
Limit Level in dB(A)
|
-
|
75
|
Table 5-2 Summarized
of Construction Noise Monitoring Results at NM2
|
Date
|
Start Time
|
End time
|
1st Leq5
|
2nd Leq5
|
3rd Leq5
|
4th Leq5
|
5th Leq5
|
6th Leq5
|
Leq30
|
|
28-May-12
|
13:00
|
13:30
|
60.0
|
59.3
|
57.8
|
59.7
|
57.8
|
56.9
|
58.7
|
|
7-Jun-12
|
11:00
|
11:30
|
63.8
|
65.8
|
63.8
|
60.8
|
61.0
|
63.9
|
63.5
|
|
12-Jun-12
|
11:39
|
12:09
|
63.7
|
64.8
|
59.3
|
60.0
|
58.3
|
60.8
|
61.8
|
|
18-Jun-12
|
14:37
|
15:07
|
71.7
|
63.7
|
63.6
|
61.2
|
62.8
|
60.6
|
66.0
|
|
Limit Level in dB(A)
|
-
|
75
|
Table 5-3 Summarized
of Construction Noise Monitoring Results at RNM3
|
Date
|
Start Time
|
End time
|
1st Leq5
|
2nd Leq5
|
3rd Leq5
|
4th Leq5
|
5th Leq5
|
6th Leq5
|
Leq30
|
Corrected* Leq30
|
|
28-May-12
|
13:45
|
14:15
|
58.3
|
57.7
|
57.4
|
57.4
|
57.5
|
58.3
|
57.8
|
60.8
|
|
7-Jun-12
|
11:40
|
12:10
|
62.4
|
62.7
|
62.7
|
62.3
|
62.4
|
62.2
|
62.5
|
65.5
|
|
12-Jun-12
|
13:00
|
13:30
|
62.7
|
63.5
|
65.0
|
63.2
|
63.9
|
65.1
|
64.0
|
67.0
|
|
18-Jun-12
|
15:15
|
15:45
|
56.8
|
56.9
|
62.0
|
64.3
|
57.3
|
55.3
|
60.1
|
63.1
|
|
Limit Level in dB(A)
|
-
|
75
|
* A façade correction of +3dB(A) has been added according
to acoustical principles and EPD guidelines.
Table 5-4 Summarized
of Construction Noise Monitoring Results at NM4
|
Date
|
Start Time
|
End time
|
1st Leq5
|
2nd Leq5
|
3rd Leq5
|
4th Leq5
|
5th Leq5
|
6th Leq5
|
Leq30
|
|
28-May-12
|
14:30
|
15:00
|
54.2
|
54.2
|
54.5
|
54.1
|
54.2
|
54.2
|
54.2
|
|
7-Jun-12
|
13:00
|
13:30
|
58.4
|
57.1
|
57.1
|
51.8
|
52.2
|
53.2
|
55.7
|
|
12-Jun-12
|
13:35
|
14:05
|
55.0
|
57.3
|
57.9
|
56.6
|
62.4
|
54.5
|
58.2
|
|
18-Jun-12
|
16:00
|
16:30
|
60.0
|
58.5
|
64.1
|
56.5
|
57.3
|
58.0
|
59.9
|
|
Limit Level in dB(A)
|
-
|
75
|
5.03
It was
noted that no noise complaint (which is an Action Level exceedance) was
received. During
the noise monitoring, external noise sources from traffic road, animals, human,
trolley and ventilation system were observed occasionally. In view of the results shown in Tables 5-1, 5-2, 5-3 and 5-4 which were all below 75dB(A), no Action
or Limit Level exceedance was triggered during this month.
6.01
The construction of marine outfall works was commenced on 19
July 2011 and therefore marine water quality
monitoring is required in this Reporting Period. In this Reporting Period, 12 events of water
quality monitoring were carried out at the designated locations.
6.02
The
monitoring results including in-situ measurements and laboratory testing
results are presented in Appendix G. The
graphical plots are shown in Appendix H.
6.03
During the Reporting Period, field measurements of both control
and impact stations showed that marine water of the depth average of the
salinity concentration was within 26.64 to 34.58 ppt, and
pH value was within 7.19 to 8.17.
6.04
Monitoring
results of 3 key parameters: dissolved oxygen (DO), turbidity and suspended
solids (SS) in this Reporting Period, are summarized in Tables 6-1, 6-2,
6-3 and 6-4. A summary of
exceedances for the 3 parameters are shown in Table 6-5.
Table 6-1 Summary
of Water Quality Results – Mid-ebb Tides (Dissolved Oxygen)
|
Sampling
date
|
Dissolved Oxygen conc. of Depth Ave. of Surf. and Mid Layer
(mg/L)
|
Dissolved Oxygen conc. of Depth Ave. of Bottom Layer (mg/L)
|
|
W1
|
W2
|
W3
|
C1
|
C2
|
C3
|
W1
|
W2
|
W3
|
C1
|
C2
|
C3
|
|
26-May-12
|
6.07
|
6.51
|
6.74
|
5.77
|
7.06
|
5.39
|
NA
|
6.32
|
6.36
|
5.64
|
6.98
|
5.42
|
|
28-May-12
|
6.74
|
7.39
|
7.10
|
6.01
|
5.49
|
6.43
|
NA
|
6.55
|
7.56
|
5.82
|
5.60
|
6.42
|
|
30-May-12
|
7.09
|
6.30
|
7.17
|
6.25
|
7.69
|
6.98
|
NA
|
6.11
|
6.59
|
6.25
|
8.35
|
6.57
|
|
1-Jun-12
|
7.00
|
6.83
|
6.60
|
6.46
|
7.22
|
6.63
|
NA
|
6.44
|
6.24
|
6.15
|
6.30
|
6.35
|
|
5-Jun-12
|
6.98
|
6.92
|
8.08
|
7.76
|
8.27
|
8.27
|
NA
|
6.64
|
7.38
|
7.25
|
7.21
|
7.21
|
|
7-Jun-12
|
6.12
|
6.42
|
5.96
|
5.97
|
6.45
|
6.45
|
NA
|
6.56
|
5.50
|
5.46
|
5.46
|
5.46
|
|
9-Jun-12
|
5.89
|
6.70
|
6.88
|
6.91
|
6.85
|
6.85
|
NA
|
6.09
|
6.70
|
6.35
|
5.64
|
5.64
|
|
12-Jun-12
|
6.23
|
5.23
|
5.31
|
4.86
|
5.22
|
5.22
|
NA
|
4.27
|
4.67
|
4.50
|
5.32
|
5.32
|
|
14-Jun-12
|
5.50
|
5.41
|
5.44
|
4.88
|
4.00
|
4.00
|
NA
|
6.42
|
4.93
|
4.87
|
3.55
|
3.55
|
|
16-Jun-12
|
6.61
|
6.36
|
6.48
|
5.88
|
4.29
|
4.29
|
NA
|
7.17
|
5.56
|
6.14
|
5.31
|
5.31
|
|
19-Jun-12
|
5.64
|
5.46
|
7.34
|
6.17
|
5.57
|
5.57
|
NA
|
5.61
|
7.90
|
5.54
|
8.69
|
8.69
|
|
21-Jun-12
|
6.02
|
5.84
|
5.93
|
5.10
|
5.93
|
5.93
|
NA
|
4.86
|
4.64
|
5.20
|
4.60
|
4.60
|
Table 6-2 Summary
of Water Quality Results – Mid-ebb Tides (Turbidity & Suspended Solids)
|
Sampling
date
|
Turbidity
Depth Ave. (NTU)
|
Suspended
Solids Depth Ave.
(mg/L)
|
|
W1
|
W2
|
W3
|
C1
|
C2
|
C3
|
W1
|
W2
|
W3
|
C1
|
C2
|
C3
|
|
26-May-12
|
0.25
|
1.37
|
1.12
|
1.13
|
1.40
|
1.62
|
0.50
|
0.83
|
1.40
|
0.77
|
1.17
|
0.53
|
|
28-May-12
|
1.80
|
2.70
|
2.73
|
2.38
|
0.77
|
1.60
|
1.60
|
4.00
|
2.20
|
2.63
|
3.00
|
0.93
|
|
30-May-12
|
1.05
|
1.25
|
1.90
|
1.43
|
1.33
|
1.78
|
3.00
|
1.20
|
0.50
|
0.50
|
0.93
|
0.50
|
|
1-Jun-12
|
1.60
|
2.30
|
1.72
|
2.07
|
2.37
|
1.82
|
4.30
|
1.67
|
3.87
|
1.27
|
3.63
|
2.17
|
|
5-Jun-12
|
1.50
|
2.10
|
4.97
|
2.57
|
2.35
|
3.25
|
2.20
|
1.97
|
1.20
|
1.85
|
1.33
|
1.03
|
|
7-Jun-12
|
1.10
|
1.08
|
1.50
|
2.93
|
1.50
|
1.78
|
2.40
|
3.10
|
2.93
|
2.10
|
3.43
|
4.33
|
|
9-Jun-12
|
0.50
|
2.47
|
0.87
|
1.33
|
1.67
|
1.57
|
1.80
|
1.50
|
6.23
|
2.00
|
1.17
|
4.73
|
|
12-Jun-12
|
2.65
|
2.28
|
3.15
|
2.77
|
1.50
|
4.10
|
0.80
|
0.50
|
0.83
|
1.97
|
2.00
|
1.13
|
|
14-Jun-12
|
0.85
|
2.75
|
5.52
|
1.53
|
1.00
|
1.85
|
5.60
|
4.87
|
2.37
|
3.27
|
2.03
|
2.80
|
|
16-Jun-12
|
3.90
|
4.25
|
5.40
|
3.48
|
4.62
|
3.42
|
3.40
|
1.73
|
2.87
|
3.93
|
3.53
|
3.20
|
|
19-Jun-12
|
3.50
|
4.10
|
3.77
|
7.10
|
7.10
|
6.08
|
2.60
|
3.63
|
2.60
|
8.37
|
3.63
|
3.50
|
|
21-Jun-12
|
1.00
|
1.30
|
2.60
|
1.02
|
1.47
|
0.97
|
3.90
|
2.67
|
1.83
|
1.57
|
1.83
|
3.60
|
Table 6-3 Summary
of Water Quality Results – Mid-flood Tides (Dissolved Oxygen)
|
Sampling
date
|
Dissolved Oxygen conc. of Depth Ave. of Surf. and Mid
Layer (mg/L)
|
Dissolved Oxygen conc. of Depth Ave. of Bottom Layer
(mg/L)
|
|
W1
|
W2
|
W3
|
C1
|
C2
|
C3
|
W1
|
W2
|
W3
|
C1
|
C2
|
C3
|
|
26-May-12
|
6.50
|
6.47
|
6.29
|
6.24
|
5.30
|
4.99
|
NA
|
6.07
|
5.84
|
5.83
|
4.85
|
4.81
|
|
28-May-12
|
5.81
|
6.73
|
6.06
|
5.63
|
6.50
|
5.33
|
NA
|
6.01
|
5.75
|
5.02
|
6.63
|
4.96
|
|
30-May-12
|
6.91
|
7.03
|
6.64
|
7.48
|
6.66
|
7.13
|
NA
|
6.60
|
6.97
|
7.33
|
6.98
|
7.12
|
|
1-Jun-12
|
7.33
|
6.39
|
6.05
|
6.51
|
6.22
|
5.80
|
NA
|
7.31
|
6.05
|
6.06
|
6.19
|
5.99
|
|
5-Jun-12
|
7.86
|
6.80
|
7.48
|
7.09
|
6.69
|
6.95
|
NA
|
6.00
|
6.73
|
6.69
|
7.86
|
6.47
|
|
7-Jun-12
|
5.91
|
5.94
|
5.52
|
6.11
|
5.08
|
5.92
|
NA
|
5.07
|
5.65
|
5.08
|
6.58
|
5.42
|
|
9-Jun-12
|
7.47
|
7.23
|
6.78
|
7.11
|
7.49
|
6.59
|
NA
|
6.92
|
7.48
|
7.49
|
6.43
|
6.64
|
|
12-Jun-12
|
5.47
|
5.65
|
5.46
|
6.71
|
6.45
|
6.53
|
NA
|
6.75
|
5.32
|
6.45
|
4.18
|
5.52
|
|
14-Jun-12
|
5.77
|
5.04
|
5.00
|
5.32
|
4.50
|
5.13
|
NA
|
4.01
|
4.37
|
4.50
|
3.52
|
5.22
|
|
16-Jun-12
|
6.18
|
6.19
|
6.74
|
7.30
|
7.31
|
6.39
|
NA
|
5.44
|
6.87
|
7.31
|
5.89
|
6.91
|
|
19-Jun-12
|
6.42
|
7.01
|
6.75
|
6.26
|
7.22
|
6.53
|
NA
|
6.47
|
6.90
|
7.22
|
4.97
|
5.57
|
|
21-Jun-12
|
6.55
|
5.70
|
6.11
|
6.72
|
5.43
|
6.65
|
NA
|
4.82
|
5.46
|
5.43
|
5.24
|
4.17
|
Table 6-4 Summary
of Water Quality Results – Mid-flood Tides (Turbidity & Suspended Solids)
|
Sampling
date
|
Turbidity
Depth Ave. (NTU)
|
Suspended
Solids Depth
Ave. (mg/L)
|
|
W1
|
W2
|
W3
|
C1
|
C2
|
C3
|
W1
|
W2
|
W3
|
C1
|
C2
|
C3
|
|
26-May-12
|
1.45
|
1.07
|
1.20
|
0.75
|
1.38
|
0.85
|
1.10
|
1.17
|
2.23
|
1.27
|
0.63
|
0.67
|
|
28-May-12
|
1.70
|
1.13
|
0.90
|
1.82
|
1.55
|
1.68
|
0.50
|
0.73
|
1.27
|
1.17
|
1.70
|
1.63
|
|
30-May-12
|
0.65
|
1.67
|
2.25
|
1.15
|
2.85
|
1.23
|
0.50
|
0.50
|
0.50
|
0.50
|
0.50
|
0.53
|
|
1-Jun-12
|
1.75
|
2.95
|
1.78
|
1.72
|
1.60
|
1.93
|
2.50
|
2.23
|
1.30
|
5.90
|
2.47
|
4.40
|
|
5-Jun-12
|
1.65
|
1.95
|
2.47
|
2.42
|
2.27
|
1.83
|
0.90
|
1.67
|
4.20
|
3.07
|
2.53
|
1.83
|
|
7-Jun-12
|
0.90
|
2.68
|
1.82
|
1.45
|
1.58
|
1.17
|
1.90
|
3.03
|
3.53
|
4.30
|
2.57
|
2.33
|
|
9-Jun-12
|
0.70
|
1.02
|
1.42
|
1.45
|
0.48
|
1.05
|
1.60
|
4.30
|
1.80
|
2.07
|
2.67
|
2.97
|
|
12-Jun-12
|
1.90
|
2.82
|
4.12
|
3.13
|
3.67
|
3.87
|
1.10
|
0.73
|
7.07
|
0.90
|
1.10
|
0.57
|
|
14-Jun-12
|
1.80
|
2.83
|
2.78
|
2.12
|
4.68
|
2.47
|
3.60
|
2.37
|
4.50
|
4.57
|
5.10
|
3.37
|
|
16-Jun-12
|
2.00
|
3.20
|
3.80
|
4.08
|
4.07
|
3.62
|
3.40
|
3.03
|
2.40
|
2.70
|
3.20
|
2.47
|
|
19-Jun-12
|
3.05
|
4.70
|
6.23
|
5.78
|
4.57
|
6.97
|
3.90
|
5.90
|
5.47
|
6.57
|
2.97
|
6.43
|
|
21-Jun-12
|
1.45
|
1.30
|
1.22
|
1.40
|
2.10
|
0.83
|
4.40
|
2.97
|
4.23
|
3.77
|
3.60
|
4.13
|
Table 6-5 Summarized
Exceedances of Marine Water Quality
|
Station
|
DO
(Ave of Surf. & mid-depth)
|
DO
(Ave. of Bottom Layer)
|
Turbidity
(Depth Ave.)
|
SS
(Depth Ave)
|
Total Exceedance
|
|
Action
|
Limit
|
Action
|
Limit
|
Action
|
Limit
|
Action
|
Limit
|
Action
|
Limit
|
|
Mid-Ebb
|
|
W1
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
|
W2
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
|
W3
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
|
Mid-Flood
|
|
W1
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
|
W2
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
|
W3
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
|
No of Exceedance
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
|
|
|
|
|
|
|
|
|
|
|
|
6.05
For marine water monitoring, no exceedance of Action/Limit
levels was recorded in this Reporting Period. Therefore, no associated
corrective actions were then required.
6
7.01
According
to Clause 3.7 and Figure 4 in the Environmental Permit No. EP-281/2007/A, a
total of 12 numbers Celtis Timorensis
(uncommon species) in Chung Mei at Sok Kwu Wan, are identified to require
labeling, fencing and protection. Out
of these, four numbers located in the Pumping Station No.1 area are required to
be transplanted in advance of pumping station construction and the
transplantation proposal has been submitted to EPD previously.
7.02
Regular
inspection of the transplanted tree was carried out by the landscaping
sub-Contractor (Melofield Nursery and Landscape Contractor Limited) on 31 May and 15 June
2012. As a contingency
measure in case that CT7 to CT10 can no longer be recovered, additional 7 no.
of Celtis Timorensis (No. CT_1A to
CT7A) were planted adjacent to the under-monitoring Celtis Timorensis CT7 to CT10 on 30 April 2011. The tree inspection report is presented
in Appendix M.
8.01
Waste management was carried out by an on-site Environmental
Officer or an Environmental Supervisor from time to time.
Records of Waste Quantities
8.02
All
types of waste arising from the construction work are classified into the
following:
l
Construction
& Demolition (C&D) Material;
l
Chemical
Waste;
l
General
Refuse; and
l
Excavated
Soil
8.03
The
quantities of waste for disposal in this Reporting Period are summarized in Table 8-1 and 8-2 and
the Monthly Summary Waste Flow Table is shown in
Appendix J. Whenever possible, materials were reused
on-site as far as practicable.
Table 8-1 Summary
of Quantities of Inert C&D Materials
|
Type of Waste
|
Quantity
|
Disposal Location
|
|
C&D Materials (Inert) (‘000m3)
|
0
|
-
|
|
Reused in the Contract (Inert) (‘000m3)
|
0
|
-
|
|
Reused in other Projects (Inert) (‘000m3)
|
0
|
-
|
|
Disposal as Public Fill (Inert) (‘000m3)
|
0
|
-
|
Table 8-2 Summary
of Quantities of C&D Wastes
|
Type of Waste
|
Quantity
|
Disposal Location
|
|
|
0
|
-
|
|
Paper / Cardboard Packing
(kg)
|
0
|
-
|
|
Plastic (kg)
|
0
|
-
|
|
Chemical Wastes (kg)
|
0
|
-
|
|
General Refuses (tonne)
|
6.4
|
Outlying Islands Transfer
Facilities (Sok Kwu Wan)
|
8.04
There
was no site effluent discharged but the estimated volume of surface runoff was
less than 50m3 in this
monthly period.
9.01
According
to the Environmental Monitoring and Audit Manual, the environmental site
inspection should been formulated by ET Leader. Regular environmental site inspections
had been carried out by the ET to confirm the environmental performance. In this Reporting Period, weekly site
inspection by ET was carried out on 29 May, 5, 12 and 19 June 2012 and a joint-site
visit by IEC Representative, RE, the Contractor and ET was carried out on 5 June 2012.
9.02
The
findings/ deficiencies that observed during the weekly site inspection are
listed in Table 9-1 and the relevant checklists are attached in Appendix K.
Table 9-1 Site
Observations
|
Date
|
Findings / Deficiencies
|
Follow-Up Status
|
|
29 May 2012
|
Ÿ
No environmental issue was observed during site
inspection.
Ÿ
As a reminder, unused chemical should be stored in
proper area with labeling.
|
Not required for reminder.
|
|
5 June 2012
|
Ÿ
Oil spillage is found from the plant. The Contractor should remove the contaminated
soil to chemical storage area.
|
Rectified on 12 June 2012.
|
|
12 June
2012
|
Ÿ
No environmental issue was observed during site
inspection.
|
N.A.
|
|
19
June 2012
|
Ÿ
The fencing of transplanted tree area is broken. The Contractor should rectify and
maintain the protection.
Ÿ
As reminded that the sediment tank should be cleaned up
regularly to maintain functioning.
|
Rectified on 21 June 2012.
|
10.01
No environmental
complaint, summons and prosecution was received in this Reporting Period. The statistical summary table of
environmental complaint is presented in Tables 10-1, 10-2 and 10-3.
Table 10-1 Statistical
Summary of Environmental Complaints
|
Reporting
Period
|
Environmental
Complaint Statistics
|
|
Frequency
|
Cumulative
|
Complaint
Nature
|
|
27 July 2010 – 31 December 2011
|
1 (Nov 2011)
|
1 (Nov 2011)
|
water quality
|
|
January - May 2012
|
0
|
1 (Nov 2011)
|
NA
|
|
June 2012
|
0
|
1 (Nov 2011)
|
NA
|
Table 10-2 Statistical
Summary of Environmental Summons
|
Reporting
Period
|
Environmental
Summons Statistics
|
|
Frequency
|
Cumulative
|
Complaint
Nature
|
|
27 July 2010 – 31 December 2011
|
0
|
0
|
NA
|
|
January - May 2012
|
0
|
0
|
NA
|
|
June 2012
|
0
|
0
|
NA
|
Table 10-3 Statistical
Summary of Environmental Prosecution
|
Reporting
Period
|
Environmental
Prosecution Statistics
|
|
Frequency
|
Cumulative
|
Complaint
Nature
|
|
27 July 2010 – 31 December 2011
|
0
|
0
|
NA
|
|
January - May 2012
|
0
|
0
|
NA
|
|
June 2012
|
0
|
0
|
NA
|
11
11.01
The environmental mitigation measures that recommended in the Sok Kwu Wan Environmental Monitoring
and Audit covered the issues of dust, noise, water
and waste and they are summarized as following:
Dust Mitigation Measure
11.02
Installation of 2m high solid fences around the construction site of
Pumping Station P2 is recommended. Implementation of the requirements
stipulated in the Air Pollution Control (Construction Dust) Regulation and the
following good site practices are recommended to control dust emission from the
site:
(a)
Stockpiles of imported material kept on site should be
contained within hoardings, dampened and / or covered during dry and windy
weather;
(b)
Material stockpiled alongside trenches should be
covered with tarpaulins whenever works are close to village houses;
(c)
Water sprays should be used during the delivery and
handling of cement, sands, aggregates and the like.
(d)
Any vehicle used for moving sands, aggregates and
construction waste shall have properly fitting side and tail boards.
Materials should not be loaded to a level higher than the side and tail boards,
and should be covered by a clean tarpaulin.
Noise Mitigation Measure
11.03
As detailed in the EIA report,
concreting work of the Pumping Station P1a
and sewer alignment construction activities would likely cause adverse noise
impacts on some of the noise sensitive receivers. Appropriate mitigation
measures have therefore been recommended. The mitigation measures
recommended in the EIA report are summarised below:
(a)
Use of quiet equipment for the construction activities of
the Pumping Stations and sewer alignment;
(b)
Use of temporary noise barrier around the site boundary
of Pumping Station P1a;
(c)
Use of kick ripper (saw and lift) method to replace the
breaker for pavement removal during sewer alignment construction;
(d)
Restriction on the number of plant during sewer alignment
construction;
(e)
Use of noise screening structures in the form of acoustic
shed or movable barrier wherever practicable and feasible in areas with
sufficient clearance and headroom during the construction of sewer alignment;
(f)
Adoption of manual working method wherever practicable
and feasible in areas where the worksites of the proposed sewer alignment are
located less than 20m from the
residential noise sensitive receivers and less than 30m from the temple and the public library; and
(g)
Implementation of the following good site practices:
Ÿ
Only well-maintained plant should be operated on-site and
plant should be serviced regularly during the construction programme.
Ÿ
Mobile plant, if any, should be sited as far away from
NSRs as possible.
Ÿ
Machines and plant (such as trucks) that may be in
intermittent use should be shut down between work periods or should be
throttled down to a minimum.
Ÿ
Plant known to emit noise strongly in one direction
should, wherever possible, be orientated so that the noise is directed away from
the nearby NSRs.
Ÿ
Material stockpiles and other structures should be
effectively utilised, wherever practicable, in screening noise from on-site
construction activities.
Water Quality Mitigation Measure
11.04
No-dig method using Horizontal Directional Drilling
(HDD) would be used for the installation of outfall pipe of about 480 m from shore to minimize the potential
water quality impacts arising from the dredging works required for the
submarine outfall construction. For the remaining outfall pipe of about 240m and the diffuser section, open trench
dredging would still be required.
11.05
During the dredging works, the Contractor should be
responsible for the design and implementation of the following mitigation measures.
Ÿ Dredging should be undertaken using closed
grab dredgers with a total production rate of 55m3/hr;
Ÿ Deployment of 2-layer silt curtains with
first layer enclosing the grab and the second layer at around 50, from the dredging
area while dredging works are in progress;
Ÿ all vessels should be sized such that
adequate clearance (i.e. minimum clearance of 0.6m) is maintained between vessels and the sea bed at
all states of the tide to ensure that undue turbidity is not generated by
turbulence from vessel movement or propeller wash;
Ÿ all pipe leakages should be repaired
promptly and plant shall not be operated with leaking pipes;
Ÿ excess material should be cleaned from the
decks and exposed fittings of barges before the vessel is moved;
Ÿ adequate freeboard (i.e. minimum of 200m) should be maintained on barges to
ensure that decks are not washed by wave action;
Ÿ all barges should be fitted with tight
fitting seals to their bottom openings to prevent leakage of material; and
Ÿ loading of barges and hoppers should be
controlled to prevent splashing of dredged material to the surrounding water,
and barges and hoppers should not be filled to a level which would cause the
overflow of materials or sediment laden water during loading or transportation;
and
Ÿ the decks of all vessels should be kept
tidy and free of oil or other substances that might be accidentally or
otherwise washed overboard.
Construction Run-off and Drainage
11.06
The Contractor should observe and comply with the Water
Pollution Control Ordinance and the subsidiary regulations. The
Contractor should follow the practices, and be responsible for the design,
construction, operation and maintenance of all the mitigation measures as
specified in ProPECC PN 1/94 “Construction Site Drainage”. The design of
the mitigation measures should be submitted by the Contractor to the Engineer
for approval. These mitigation measures should include the following
practices to minimise site surface runoff and the chance of erosion, and also
to retain and reduce any suspended solids prior to discharge:
Ÿ Provision of perimeter channels to
intercept storm-runoff from outside the site. These should be constructed
in advance of site formation works and earthworks.
Ÿ Works programmes should be designed to
minimize works areas at any one time, thus minimising exposed soil areas and
reducing the potential for increased siltation and runoff.
Ÿ Sand/silt removal facilities such as sand
traps, silt traps and sediment basins should be provided to remove the
sand/silt particles from run-off. These facilities should be properly and
regularly maintained. These facilities shall be carefully planned to
ensure that they would be installed at appropriate locations to capture all
surface water generated on site.
Ÿ Careful programming of the works to
minimise soil excavation works during rainy seasons.
Ÿ Exposed soil surface should be protected by
paving or hydroseeding as soon as possible to reduce the potential of soil
erosion.
Ÿ Trench excavation should be avoided in the
wet season, and if necessary, these should be excavated and backfilled in short
sections.
Ÿ Open stockpiles of construction materials
on site should be covered with tarpaulin or similar fabric.
General Construction Activities
11.07
Debris and rubbish generated on-site should be
collected, handled and disposed of properly to avoid entering the nearby
coastal waters and stormwater drains. All fuel tanks and storage areas
should be provided with locks and be sited on sealed areas, within bunds of a
capacity equal to 110% of the storage capacity of the largest tank. Open
drainage channels and culverts near the works areas should be covered to block
the entrance of large debris and refuse.
Wastewater Arising
from Workforce
11.08
Portable toilets shall be provided by the Contractors,
where necessary, to handle sewage from the workforce. The Contractor shall also
be responsible for waste disposal and maintenance practices
Sediment Contamination Mitigation Measure
11.09
The basic requirements and procedures
for dredged mud disposal are specified under the WBTC No. 34/2002. The
management of the dredging, use and disposal of marine mud is monitored by the
MFC, while the licensing of marine dumping is the responsibility of the
Director of Environmental Protection (DEP).
11.10
The uncontaminated dredged
sediment will be loaded onto barges and transported to the designated marine
disposal site. Appropriate dredging methods have been incorporated into the
recommended water quality mitigation measures including the use of closed-grab
dredgers and silt curtains. Category L sediment would be suitable for
disposal at a gazetted open sea disposal ground.
11.11
During transportation and
disposal of the dredged marine sediments, the following measures should be
taken to minimize potential impacts on water quality:
Ÿ Bottom
opening of barges should be fitted with tight fitting seals to prevent leakage
of material. Excess material should be cleaned from the decks and exposed
fittings of barges and hopper dredgers before the vessel is moved.
Ÿ Monitoring
of the barge loading should be conducted to ensure that loss of material does
not take place during transportation. Transport barges or vessels should be
equipped with automatic self-monitoring devices as specified by the DEP.
Construction Waste Mitigation Measure
Good Site Practices and Waste
Reduction Measures
11.12
It is not anticipated that
adverse waste management related impacts would arise, provided that good site practices
are strictly followed. Recommendations for good site practices for the
construction waste arising include:
Ÿ Nomination
of an approved person, such as a site manager,
to be responsible for the implementation of good site practices, arranging for collection
and effective disposal to an appropriate facility, of all wastes generated at
the site.
Ÿ Training
of site personnel in proper waste management and chemical handling procedures.
Ÿ Appropriate
measures to minimize windblown litter and dust during transportation of waste
by either covering trucks or by transporting wastes in enclosed containers.
Ÿ Provision
of sufficient waste disposal points and regular collection for disposal.
Ÿ Separation
of chemical wastes for special handling and appropriate treatment at the
Chemical Waste Treatment Facility.
Ÿ Regular cleaning and
maintenance programme for drainage systems, sumps and oil interceptors.
Ÿ Maintain
records of the quantities of wastes generated, recycled and disposed.
11.13
In order to monitor the disposal
of C&D waste at landfills and to control fly tipping, a trip-ticket system
should be included as one of the contractual requirements and implemented by an
Environmental Team undertaking the Environmental Monitoring and Audit
work. An Independent Environmental Checker should be responsible for
auditing the results of the system.
11.14
Good management and control can
prevent the generation of significant amount of waste. Waste reduction is
best achieved at the planning and design stage, as well as by ensuring the
implementation of good site practices. Recommendations to achieve waste
reduction include:
Ÿ segregation
and storage of different types of waste in different containers, skips or
stockpiles to enhance reuse or recycling of materials and their proper
disposal;
Ÿ to
encourage collection of aluminium cans by individual collectors, separate
labelled bins should be provided to segregate this waste from other general
refuse generated by the work force;
Ÿ any
unused chemicals or those with remaining functional capacity should be
recycled;
Ÿ use
of reusable non-timber formwork to reduce the amount of C&D material;
Ÿ prior
to disposal of C&D waste, it is recommended that wood, steel and other
metals should be separated for re-use and / or recycling to minimise the
quantity of waste to be disposed of to landfill;
Ÿ proper
storage and site practices to minimise the potential for damage or
contamination of construction materials; and
Ÿ plan and stock
construction materials carefully to minimise amount of waste generated and
avoid unnecessary generation of waste.
General
Site Wastes
11.15
A collection area should be
provided where waste can be stored prior to removal from site. An
enclosed and covered area is preferred for the collection of the waste to reduce
'wind blow' of light material.
Chemical Wastes
11.16
After use, chemical waste (eg.
cleaning fluids, solvents, lubrication oil and fuel) should be handled
according to the Code of Practice on the Packaging, Labelling and Storage of
Chemical Wastes. Any unused chemicals or those with remaining functional
capacity should be recycled. Spent chemicals should be properly stored on
site within suitably designed containers, and should be collected by an
approved operator for disposal at the Chemical Waste Treatment Facility or
other licenced facility in accordance with the Waste Disposal (Chemical Waste)
(General) Regulation under the Waste Disposal Ordinance.
11.17
Any service shop and minor
maintenance facilities should be located on hard standings within a bunded area,
and sumps and oil interceptors should be provided. Maintenance of
vehicles and equipment involving activities with potential for leakages and
spillage should only be undertaken with the areas appropriately equipped to
control these discharges.
Construction and Demolition
Material
11.18
The C&D material should be
separated on-site into three categories: (i) public fill, the inert portion of
the C&D material (e.g. concrete and rubble), which should be re-used
on-site or disposed of at a public filling area; (ii) C&D waste for re-use
and/or recycling, the non-inert portion of the C&D material, (e.g. steel
and other metals, wood, glass and plastic); (iii) C&D waste which cannot be
re-used and/or recycled. The waste producers are responsible for its
disposal at strategic landfills.
11.19
In order to minimise the impact
resulting from collection and transportation of material for off-site disposal,
it was recommended that inert material should be re-used on-site where
possible. Prior to disposal of C&D material, it was also recommended
that steel and other metals should be separated for re-use and/or recycling
where practicable to minimise the quantity of waste to be disposed of to
landfill.
Ecology Mitigation Measure
Terrestrial Ecology
11.20
The uncommon tree species should
be labelled and probably fenced to avoid direct or indirect disturbance during
construction. Works areas should avoid woodland habitats, in particular
where these trees are located.
11.21
Construction and maintenance of
site runoff control measures would be required at all work sites during
construction. These should include barriers to direct runoff to sand/silt
removal facilities (sand/silt/traps and/or sediment basins); minimisation of
earthworks during rainy season (May to September); and coverage of sand/fill
piles and exposed earth during storms.
11.22
Special attention should be paid
during the breeding season of Romer’s Tree Frog (March to September) to ensure
their habitat landward to Pumping Station P2 site is well protected from site
runoff. Barriers should be deployed completely along the landward side of the
pumping station site boundary to prevent any site runoff from entering the tree
frog habitat. Intactness of the barriers should be frequently inspected.
Intertidal and
Subtidal Ecology
11.23
Construction and maintenance of
site runoff control measures would be required at all work sites during
construction. These should include barriers to direct runoff to sand/silt
removal facilities (sand/silt/traps and/or sediment basins); use of silt
curtains along coastline; minimisation of earthworks during rainy season (May
to September); and coverage of sand/fill piles and exposed earth during storms.
11.24
To reduce impacts of sediment
resuspension upon nearby habitats and organisms during dredging, all dredging
should be done using a closed-grab dredger, and silt curtains should be
deployed around the dredger during all dredging activity
Fisheries Mitigation Measure
11.25
Closed grab dredger, deployment of silt curtains
around the immediate dredging area and low dredging rate have been recommended
in Water Quality of the EIA report in order to minimise sediment release into
the water column.
Landscape & Visual Mitigation Measure
11.26
Mitigation measures recommended
in the EIA Report for landscape and visual impacts during the construction
stage are summarised below.
Ÿ Screening of site
construction works by use of hoarding that is appropriate to its site context;
Ÿ Retaining existing
trees and minimising damage to vegetation where possible by close co-ordination
and on site alignment adjusted of rising main and gravity sewer
pipelines. Tree protective measures should be implemented to ensure trees
identified as to be retained are satisfactorily protected during the construction
phase;
Ÿ Careful and efficient
transplanting of affected trees (1 no.) to temporary or final transplant
location (the proposed tree to be transported is a semi-mature Macaranga
tanarius and is located at the proposed Pumping Station P2 location);
Ÿ Short excavation and
immediate backfilling of sections upon completion of works to reduce active
site area;
Ÿ Conservation of
top-soil for reuse.
Ÿ Night-time light
source from marine fleets should be directed away from the residential units
11.27
The implementation schedule of mitigation measures is
presented in Appendix L.
11.28
Leader had been implementing the required environmental mitigation
measures according to the Sok Kwu Wan Environmental Monitoring
and Audit Manual subject to the site condition. Environmental mitigation measures
generally implemented by Leader in this Reporting Period are summarized in Table
11-1.
Table
11-1 Environmental Mitigation
Measures
|
Issues
|
Environmental Mitigation Measures
|
|
Water Quality
|
· Drainage channels were provided
to convey run-off into the treatment facilities; and
· Drainage systems were regularly and
adequately maintained.
|
|
Air Quality
|
·
Cover all excavated or
stockpile of dusty material by impervious sheeting or sprayed with water to maintain
the entire surface wet;
·
Public roads around the site entrance/exit had been kept clean
and free from dust; and
·
Tarpaulin
covering of any dusty materials on a vehicle leaving the site.
|
|
Noise
|
·
Good site practices to limit
noise emissions at the sources;
·
Use of quite plant and
working methods;
·
Use of site hoarding or
other mass materials as noise barrier to screen noise at ground level of
NSRs; and
·
To minimize plant number use at the worksite.
|
|
Waste and Chemical Management
|
·
Excavated material should be
reused on site as far as possible to minimize off-site disposal. Scrap metals
or abandoned equipment should be recycled if possible;
·
Waste arising should be kept
to a minimum and be handled, transported and disposed of in a suitable
manner;
·
The Contractor should adopt
a trip ticket system for the disposal of C&D materials to any designed
public filling facility and/or landfill; and
·
Chemical waste shall be handled in accordance with the
Code of Practice on the Packaging, Handling and Storage of Chemical Wastes.
|
|
General
|
Ÿ The
site was generally kept tidy and clean.
|
11
12
12.01Key
issues to be considered in the coming month include:
Water Quality
·
Erect of sand bag in proper area to avoid any muddy surface runoff
from the loose soil surface or haul road during the rainy days; and
·
The accumulated stagnant water should be drained away.
Air Quality
·
Vehicles shall be cleaned of mud and debris before leaving the
site;
·
Stockpile and loose soil surface shall be covered with tarpaulin
sheet or other means to eliminate the fugitive dust;
·
Water spaying on the dry haul road and exit/entrance of the site
in regular basis is reminded; and
·
Public roads around the site entrance/exit had been kept clean and
free from dust.
Noise
·
Works and equipment should be located to minimize noise nuisance from the
nearest sensitive receiver; and
·
Idle equipments should be either turned off or throttled down;
Waste and Chemical Management
·
Housekeeping on site shall be improved;
·
The Contractor is advised to fence off the construction waste at a
designated area in order to maintain the tidiness of the site;
·
Drip tray and proper label should be
provided for all chemical containers.
·
C&D waste should be disposed in
regular basis.
