In March 2005, the Project
Proponent, Profit Point Enterprises Limited, acquired the development site in Yuen Long at Wo Shang Wai. An
Environmental Impact Assessment (EIA) was carried out under the EIA Ordinance (EIAO)
since then and the Environmental Permit (EP-311/2008B) for construction of the
comprehensive development in Wo Shang Wai was granted by EPD on 29 July 2010. The
Project involves the residential development and associated infrastructure and wetland restoration area and linear landscape
area. The construction works under the Environmental Permit commenced on 12 May
2010.
Heng
Shung Construction Co. Ltd. was commissioned as the Contractor for the Project.
Mott MacDonald Hong Kong Ltd. (“MMHK”) has been commissioned by Heng Shung
Construction Co. Ltd. to undertake the Environmental Team (ET) services to
carry out environmental monitoring and audit (EM&A) for both pre-construction
and construction phases of the Proposed Comprehensive Development at Wo Shang
Wai, Yuen Long.
According to the EP Condition 4.5,
the monthly EM&A Report shall be submitted to the Director within 2 weeks
after the end of the reporting month. This report summarises the findings
during the period from 1 February 2011 to 28 February 2011.
The organisation chart and lines of communication with respect to the
on-site environmental management structure together with the contact
information of the key personnel are shown in Appendix A.
During the reporting period,
construction works of the Project undertaken include:
¡
Band drain installation;
¡
Trial Embankment for Ground Improvement; and
¡
Site formation (Filling)
The Construction Works Programme
of the Project is provided in Appendix B. The general layout plan of the
Project site is shown in Figure 1.1.
The EM&A programme requires environmental monitoring of air
quality, noise, water quality, ecology and landscape and visual as specified in the
approved EM&A Manual.
A summary of impact EM&A requirements is presented in Table 1.1:
Table 1.1: Summary
of Impact EM&A Requirements
|
Parameters
|
Descriptions
|
Locations
|
Frequencies
|
|
Air Quality
|
24-Hour TSP
|
ASR1, ASR2A, ASR3, ASR4
|
Once every 6 days
|
|
1-Hour TSP
|
ASR1, ASR2A, ASR3, ASR4
|
3 times every 6 days
|
|
Noise
|
Leq, 30min
|
NSR1, NSR3, NSR5, NSR7
|
Weekly
|
|
Water Quality
|
Dissolved Oxygen (DO), temperature, pH, suspended solids (SS) and
Biological Oxygen Demand (BOD)
|
MP1 to MP6
|
3 days per week
|
|
Ecology
|
Birds
|
Within the Project Area and Assessment Area of 500m
|
Weekly
|
|
Dragonflies and Butterflies
|
Within the Project Area and Assessment Area of 500m
|
Once per month during Mar and Sep to November, and twice per month
during Apr to Aug
|
|
Herpetofauna
|
Within the Project Area and Assessment Area of 500m
|
Once per month during Apr to Nov
|
|
Water quality of WRA
|
Wetland Restoration Area
|
After filling of WRA with water, monthly for in situ water quality
and every size months (end of wet season and end of dry season) for
laboratory testing
|
|
Site Inspections
|
Within the Project Area and Assessment Area of 500m
|
Weekly
|
|
Landscape
and Visual
|
Auditing of protection of existing
trees, the transplanting of existing trees, the creation of new wetland, the
planting of new trees and shrubs and other landscape and visual mitigation
measures
|
CM1 to CM10 and OM1 to OM7 within the
Project Area
|
Site inspections once every two
weeks during construction phase; once every two months during operational
phase
|
The Environmental Quality Performance Limits for air quality, noise
and water quality are shown in Appendix C.
The Event and Action Plan for air quality, noise and water quality are shown in Appendix D.
The monitoring schedule for the
reporting month is shown in Table 1.2
below:
Table 1.2: Environmental
Monitoring and Audit Schedule for February 2011
For air quality, construction noise and water quality, ecology, landscape and visual monitoring
methodology, including the monitoring locations, monitoring equipments used,
monitoring parameters, and frequency and duration etc., are detailed in this
Chapter.
In accordance with the EM&A
Manual, 1-hour and 24-hour TSP levels monitoring are to be conducted during the construction phase. Table 2.1 summarizes the monitoring parameters, frequency and duration of air
quality monitoring.
Table 2.1: Air Quality Monitoring Parameters, Frequency and
Duration
|
Monitoring Stations
|
Parameter
|
Frequency and Duration
|
|
ASR1, ASR2A, ASR3 & ASR4
|
24-hour TSP
|
At least once in every six-days
|
|
1-hour TSP
|
3 times every six-days
|
2.2.2
Monitoring Locations
The 4 air quality monitoring stations were established in the
EM&A manual and were slightly adjusted during the baseline monitoring
phase. Locations of the agreed air quality monitoring stations are listed in Table 2.2 and as shown in Figure 2.1.
Table 2.2: Air
monitoring stations
|
Monitoring Stations
|
Locations
|
|
ASR1
|
Works Site Boundary
|
|
ASR2A
|
At the rooftop of refuse collection point,
which is located at the southwest of the project area
|
|
ASR3
|
At the commercial centre at Palm Springs, which is
located at the south of the project area
|
|
ASR4
|
Works Site Boundary
|
Continuous 24-hour TSP air
quality monitoring is conducted using High Volume Sampler (HVS)
(Model: GMWS-2310 Accu-vol). The HVS meets all the requirements of the EM&A
Manual. Portable direct reading dust meters were used to carry out the 1-hour
TSP monitoring. Table 2.3 summarizes
the equipment used in the impact air quality monitoring.
Table 2.3: TSP Monitoring Equipment
|
Equipment
|
Model
|
|
24-hr TSP monitoring
|
|
High
Volume Sampler
|
GMWS
2310 Accu-vol
|
|
Calibrator
|
GMW
25
|
|
1-hr TSP monitoring
|
|
Portable
direct reading dust meter
|
AM510
SidePak Personal Aerosol Monitor
|
2.2.4
Monitoring Methodology
24-hour TSP Monitoring
Installation
The HVS was installed in the vicinity of the air sensitive
receiver. The following criteria were
considered in the installation of the HVS.
·
A horizontal platform with
appropriate support to secure the sampler against gusty wind was provided.
·
The distance between the HVS
and any obstacles, such as buildings, was at least twice the height that the
obstacle protrudes above the HVS.
·
A minimum of 2 meters
separation from walls, parapets and penthouse was required for rooftop sampler.
·
A minimum of 2 meters
separation from any supporting structure, measured horizontally was required.
·
No furnace or incinerator flues
or building vent were nearby.
·
Airflow around the sampler was
unrestricted.
·
The sampler has been more than
20 metres from any drip line.
·
Permission was obtained to set
up the samplers and to obtain access to the monitoring stations.
·
A secured supply of electricity
is needed to operate the samplers.
Preparation of Filter
Papers
·
Glass fibre filters, were
labelled and sufficient filters that were clean and without pinholes were
selected.
·
All filters were equilibrated
in the conditioning environment for 24 hours before weighing. The conditioning
environment temperature was around 25 °C and not variable by more than ±3 °C
with relative humidity (RH) < 50% and was not variable by more than ±5
%. A convenient working RH was 40%.
Field Monitoring
·
The power supply was checked to
ensure the HVS works properly.
·
The filter holder and the area
surrounding the filter were cleaned.
·
The filter holder was removed
by loosening the four bolts and a new filter, with stamped number upward, on a
supporting screen was aligned carefully.
·
The filter was properly aligned
on the screen so that the gasket formed an airtight seal on the outer edges of
the filter.
·
The swing bolts were fastened
to hold the filter holder down to the frame.
The pressure applied should be sufficient to avoid air leakage at the
edges.
·
The shelter lid was closed and
was secured with the aluminium strip.
·
The HVS was warmed-up for about
5 minutes to establish run-temperature conditions.
·
A new flow rate record sheet
was set into the flow recorder.
·
The flow rate of the HVS was
checked and adjusted at around 1.1 m3/min. The range specified in
the EM&A Manual was between 0.6-1.7 m3/min.
·
The programmable timer was set
for a sampling period of 24 hrs + 1 hr, and the starting time, weather
condition and the filter number were recorded.
·
The initial elapsed time was
recorded.
·
At the end of sampling, the
sampled filter was removed carefully and folded in half length so that only
surfaces with collected particulate matter were in contact.
·
It was then placed in a clean
plastic envelope and sealed.
·
All monitoring information was
recorded on a standard data sheet.
·
Filters were sent to a HOKLAS
accredited laboratory for analysis.
Maintenance and
Calibration
·
The HVS and its accessories are
maintained in good working condition, such as replacing motor brushes routinely
and checking electrical wiring to ensure a continuous power supply.
·
HVSs were calibrated at 2-month
intervals.
·
Calibration records for HVSs
are shown in Appendix E.
1-hour TSP Monitoring
Field Monitoring
The measuring procedures of the 1-hour dust meter are 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.
Maintenance and
Calibration
·
The 1-hour dust meter would be
checked at 3-month intervals and calibrated at 1-year intervals throughout all
stages of the air quality monitoring.
·
Calibration records for direct
dust meters are shown in Appendix E.
2.3.1
Monitoring Parameters,
Frequency and Duration
Following the requirements in the EM&A Manual for noise, noise
monitoring has to be carried out during the
construction phase. Continuous noise monitoring for the
A-weighted levels Leq, L10 and L90 is undertaken once per every week.
Table 2.4 summarizes the monitoring parameters,
frequency and duration of air quality monitoring.
Table 2.4: Noise Monitoring
Parameters, Frequency and Duration
|
Monitoring Stations
|
Parameter
|
Frequency and Duration
|
|
NSR1, NSR3,
NSR5, NSR7
|
Leq, L90 & L10
|
Once every
week
|
2.3.2
Monitoring Locations
The 4 noise quality monitoring stations were established
in the EM&A manual and were slightly adjusted during the baseline
monitoring phase. Locations of the agreed noise quality
monitoring stations are listed in Table
2.5 and as shown
in Figure 2.2.
Table 2.5: Noise
monitoring stations
|
Monitoring Stations
|
Locations
|
Type of measurement
|
|
NSR1
|
Noise monitoring equipment was set up near
the boundary wall at Palm Springs.
|
Free-field
|
|
NSR3
|
The monitoring station was located next to
the guard house at Palm Springs.
|
Facade
|
|
NSR5
|
The monitoring station was located within
the work site boundary.
|
Free-field
|
|
NSR7
|
The monitoring station was located near the
boundary wall of the house of Mai Po San Tsuen.
|
Free-field
|
2.3.3
Monitoring Equipments
Integrating Sound Level Meter will be used for
noise monitoring. It is a Type 1 sound level meter
capable of giving a continuous readout of the noise level readings including
equivalent continuous sound pressure level (Leq) and percentile
sound pressure level (Lx). They comply with International
Electrotechnical Commission Publications 651:1979 (Type 1) and 804:1985 (Type
1). Table 2.6 summarizes the noise monitoring equipment
model being used.
Table 2.6: Noise Monitoring
Equipment
|
Monitoring locations
|
Equipment Model
|
|
Integrating Sound
Level Meter
|
Calibrator
|
|
NSR1
|
Rion
NL-31
|
Rion
NC-74
|
|
NSR3
|
|
NSR5
|
|
NSR7
|
2.3.4
Monitoring Methodology
Field Monitoring
·
The Sound Level Meter was set
on a tripod at a height of at least 1.2 m above the ground.
·
Façade and free-field
measurements were made at the monitoring locations.
·
The battery condition was
checked to ensure the correct functioning of the meter.
·
Parameters such as frequency
weighting, the time weighting and the measurement time were set as follows:
- frequency weighting: A
- time weighting: Fast
- time measurement: 30 minutes intervals (between
0700 and 1900)
·
Prior to and after each noise
measurement, the meter was calibrated using a Calibrator for 94 dB at 1
kHz. If the difference in the
calibration level before and after measurement was more than 1 dB, the
measurement would be considered invalid has to be repeated after re-calibration
or repair of the equipment.
·
During the monitoring period,
the Leq, L10 and L90 were recorded. In addition, any site observations and noise
sources were recorded on a standard record sheet.
Maintenance and
Calibration
·
The microphone head of the
sound level meter and calibrator is cleaned with soft cloth at quarterly
intervals.
·
The meter and calibrator are
sent to the supplier or HOKLAS laboratory to check and calibrate at yearly
intervals.
·
Calibration records are shown
in Appendix E.
2.4.1
Monitoring Parameters,
Frequency and Duration
In accordance with the requirements in the EM&A
Manual for water quality, water quality parameters including
Dissolved Oxygen (DO), temperature, pH, turbidity, suspended solids (SS) and
Biochemical Oxygen Demand (BOD) have to be monitored at designated monitoring
stations during construction of the Project. DO, temperature and
pH were measured in-situ whereas SS and BOD were analysed in a laboratory. The measurements should be taken at
all designated monitoring stations, 3 days per week. The interval between any
two sets of monitoring was not less than 36 hours. Table 2.7 summarizes
the monitoring parameters, frequency and duration of water quality monitoring.
Table 2.7: Water Quality
Monitoring Parameters, Frequency and Duration
|
Monitoring Stations
|
Parameter
|
Frequency and Duration
|
|
MP1, MP2, MP3,
MP4, MP5 & MP6
|
DO,
temperature, pH, SS, turbidity, BOD
|
Three days
every week
|
2.4.2
Monitoring Locations
The 6 water quality
monitoring stations were established in the EM&A manual. Locations of the
agreed water quality monitoring stations are listed in Table 2.8 and as shown in Figure 2.3.
Table 2.8: Water quality monitoring
stations
|
Monitoring Stations
|
Easting
|
Northing
|
|
MP1
|
838 730.50
|
822 862.25
|
|
MP2
|
838 933.26
|
823 247.41
|
|
MP3
|
839 107.17
|
823 596.84
|
|
MP4
|
839 286.14
|
823 638.55
|
|
MP5
|
839 134.35
|
823 722.99
|
|
MP6
|
839 063.02
|
823 842.25
|
2.4.3
Monitoring Equipments
The Water Quality Monitoring Equipments and Analytical Methods
applied to Water Quality Samples are given in Table 2.9 and Table 2.10 respectively. Details of which are
discussed below.
Table 2.9: Water Quality Monitoring Equipments
|
Equipment
|
Model
|
Equipment /Serial Number
|
|
Dissolved oxygen, temperature & pH Measuring
Meter
|
YSI Professional Plus
|
10D101566
|
|
Turbidimeter
|
Hach 2100Q
|
09120C000514
|
|
Global Positioning System (GPS)
|
Garmin
eTrex Vista
|
ENO 007
|
Table 2.10: Analytical Methods applied to Water Quality Samples
|
Determinant, unit
|
Standard Method
|
|
Total Suspended Solids, mg/L
|
In house method based on APHA 2540D; ALS Method
Code: EA-025
|
|
Biochemical Oxygen Demand (BOD), mg/L
|
In house method based on APHA 5210B; ALS Method
Code: EP-030
|
All in-situ monitoring instruments were checked, calibrated and
certified by a laboratory accredited under HOKLAS or
any other international accreditation scheme before use.
Dissolved Oxygen (DO), temperature and pH measuring equipment
A portable, weatherproof multiparameter instrument YSI 556 MPS was used in the
monitoring. It can be capable for measuring dissolved oxygen (DO), pH, and
temperature simultaneously with the following limits:
·
a dissolved oxygen level in the
range of 0-50 mg/L and 0-500 % saturation;
·
a temperature of -5 to 45
degree Celsius; and
·
pH value of 0-14 with 0.1 as
the base unit.
Turbidity Measurement Instrument
Portable and weatherproof turbidity meter (HACH model 2100P) was used
during impact monitoring. It has a photoelectric sensor capable of measuring
turbidity between 0-1000 NTU. Response of the
sensor was checked with certified standard turbidity solutions before the start of
measurement.
Global Positioning System
A hand-held GPS navigator (Garmin eTrex Vista) was used to identify the designated monitoring stations prior to
water sampling.
Suspended Solids and BOD
Measurements (Sample Containers and Storage)
Water samples for SS analysis were
stored in high density polythene bottles with no preservative added, packed in
ice (cooled to 4oC without being frozen), delivered to the laboratory,
and analysed as soon as possible after collection. Analysis was carried out in a
HOKLAS accredited laboratory.
Detection
Limit
The
limits of detection for the in-situ and laboratory measurements are shown in Table
2.11.
Table 2.11: Detection Limits for Water Quality Determinants
|
Determinant
|
Limit of Detection
|
|
Dissolved Oxygen
|
0.1 mg/L
|
|
Temperature
|
0.1 degree Celsius
|
|
pH
|
0.01 unit
|
|
Turbidity
|
0.1 NTU
|
|
Suspended Solids
|
1 mg/L
|
|
BOD
|
2 mg/L
|
2.4.4
Monitoring Methodology
In situ measurement
All pH meters, DO/ temperature
meters had been checked and calibrated prior to use. Standard buffer solution
of at least 2 pH levels (either pH 4 and pH 7 or pH 7 and pH 10) had been used
for calibration of the instrument before and after use.
DO meters had been calibrated by a
laboratory accredited under HOKLAS or any other international accreditation
scheme, and subsequently re-calibrated at 3 monthly intervals throughout all
stages of the water quality monitoring. Responses of sensors and electrodes had
been checked with certified standard solutions before each use. Wet bulb
calibrations for all DO meters had been carried out before measurement at each
monitoring location. For the on site calibration of field equipment, BS
127:1993, "Guide to field and on-site test methods for the analysis of
waters" had been observed.
Measurements shall be at 3 water
depths, namely, 1m below water surface, mid-depth and 1m above stream bed/pond
bed, except where the water depth less that 6m, the mid-depth station maybe omitted. Should the water depth be less than 3m,
only the mid-depth station will be monitored.
Replicates in-situ measurements
and samples collected from each independent monitoring event are required for
all parameters to ensure a robust statistically interpretable dataset.
Water Samples Preparation and
Analysis
For collection of water sampling
within the water courses, a 500ml clean plastic beaker was used. After
collection, the water samples were stored in high-density polythene bottles.
The sample container was rinsed with a portion of the water sample. The water sample was then transferred to
the container, labelled with a unique sample ID and sealed with a screw cap. The water samples
were stored in a cool box maintained at 4oC. The water samples were then delivered to
a local HOKLAS-accredited laboratory (ALS) on the same day for analysis.
The testing methods of testing
parameters as recommended by EIA or required by EPD, with the QA/QC results are in accordance with the requirement of
HOKLAS or international accredited scheme.
The
calibration certificates for equipments used for in-situ
monitoring of water quality are attached in Appendix E.
2.5.1
Monitoring Parameters,
Frequency and Duration
Target species and certain other
fauna will be monitored within the Project Area and Assessment Area during the
wetland and residential construction phase. This will be important to ensure
that any unexpected events or impacts either on- or off-site are quickly
identified so that remedial action can be taken. The groups to be monitored and frequency of
monitoring are shown in Table 2.12.
Table 2.12: Summary of Construction Phase Ecological Monitoring
for the Wo Shang Wai WRA
|
|
Construction Phase Ecological Monitoring
|
|
Birds
|
Weekly (including
Assessment Area).
|
|
Dragonflies and
Butterflies
|
Once per month during
March and September to November, and twice per month during April to August.
|
|
Herpetofauna
|
Once per month during
April to November.
|
|
Water Quality
|
After filling of WRA
with water, monthly for in situ
water quality and every six months (end of the wet season and end of the dry
season) for laboratory testing.
|
|
Site Inspections
|
Weekly.
|
2.5.2
Monitoring Locations and Methodology
Ecological
monitoring locations during
construction phase are shown in Figure 4.1 and the methodology for ecological monitoring
is detailed in Section 4.
2.6.1
Monitoring Parameters,
Frequency and Duration
All measures
undertaken by both the Contractor and the specialist Landscape Sub-Contractor
during the construction phase and first year of the operational phase shall be
audited by a Registered Landscape Architect, as a member of the ET, on a
regular basis to ensure compliance with the intended aims of the measures. Site inspections should be undertaken at
least once every two weeks throughout the construction period and once every
two months during the operational phase.
The
broad scope of audit is detailed below but should also be undertaken with
reference to the more specific checklist provided in Table 2.13 below. Operational phase auditing will be restricted to
the last 12 months of the establishment works of the landscaping proposals and
thus only the items below concerning this period are relevant to the
operational phase.
·
The extent of the agreed works area should
be regularly checked during the construction phase. Any trespass by the
Contractor outside the limit of the works, including any damage to existing
trees and woodland shall be noted;
·
The progress of the engineering works
should be regularly reviewed on site to identify the earliest practical
opportunities for the landscape works to be undertaken;
·
All existing vegetation, streams and other
features within the study area which are not directly affected by the works are
retained and protected;
·
The methods of protecting existing
vegetation proposed by the Contractor are acceptable and enforced;
·
Preparation, lifting transport and
re-planting operations for any transplanted trees;
·
The layout, design and construction of buildings
conforms to requirements specified in the EIA report;
·
All landscaping works are carried out in
accordance with the EIA recommendations and with specifications;
·
The planting of new trees, shrubs,
groundcover, climbers, grasses and other plans, together with the replanting of
any transplanted trees are carried out properly and within the right season;
·
All necessary horticultural operations and
replacement planting are undertaken throughout the Establishment Period to
ensure the healthy establishment and growth of both transplanted trees and all
newly establishment plants.
Table 2.13: Construction and Operation
Phase Audit Checklist
|
Area
of Works
|
Items
to be Monitored
|
|
Works Area
|
Check the extent of the Works to ensure that the
Works Area is not exceeded
|
|
Protection of all trees and woodland blocks to be
retained
|
Identification and demarcation of trees / vegetation
to be retained, erection of physical protection (e.g. fencing), monitoring
against possible incursion, physical damage, fire, pollution, surface
erosion, etc.
|
|
Streams
|
Ensure no run-off into existing streams
|
|
Clearance of existing vegetation
|
Identification and demarcation of trees / vegetation
to be cleared, checking of extent of works to minimize damage, monitoring of
adjacent areas against possible incursion, physical damage, fire, pollution,
surface erosion, etc.
|
|
Transplanting of trees
|
Identification and demarcation of trees / vegetation
to be transplanted, monitoring of extent of pruning / lifting works to
minimize damage, timing of operations implementation of all stages of
preparatory and translocation works, and maintenance of transplanted
vegetation, etc.
|
|
Topsoil stripping
|
Ensuring existing topsoil is stripped and stored
under recognized good practice and is hydroseeded and regularly turned to
prevent anaerobic conditions
|
|
New buildings
|
Ensure that building finishes accord with mitigation
proposals with regard to colour and albedo.
|
|
Boundaries
|
Ensuring hoarding are erected as required
|
|
Noise Barrier
|
Ensure noise barrier design accords with the
mitigation proposals with regard to location, materials and finishes.
|
|
Night-time lighting
|
Ensuring night-time lighting is directional, hooded
and shielded away from VSRs
|
|
Plant supply
|
Monitoring of operations relating to the supply of
specialist plant material (including the collecting, germination and growth
of plants from seed) to ensure that plants will be available in time to be
used within the construction works.
|
|
Landscape and wetland treatments generally
|
Check that wetland, and hard / soft landscape designs
conform to intent of mitigation measures and agreed designs
|
|
Soiling, planting, etc.
|
Monitoring of implementation and maintenance of
soiling and planting works against possible incursion, physical damage, fire,
pollution, surface erosion, etc.
|
|
Establishment Works
|
Monitoring of implementation of maintenance operation
during Establishment Period
|
2.6.2
Monitoring Locations
The monitoring locations should
check against the mitigation measures proposed under the approved Environmental
Impact Assessment, which are summarised as follows:
Table 2.14: Proposed Construction Phase
Mitigation Measures
|
ID
No.
|
Landscape
and Visual Mitigation Measure
|
|
CM1
|
The construction area and contractor’s temporary
works areas should be minimised to avoid impacts on adjacent landscape.
|
|
CM2
|
Screening of construction works by hoardings/noise
barriers around Works area in visually unobtrusive colours, to screen Works.
|
|
CM3
|
Reduction of construction period to practical
minimum.
|
|
CM4
|
Topsoil, where identified, should be stripped and
stored for re-use in the construction of the soft landscape works, where the
soil material meets acceptable criteria and where practical. The Contract Specification shall include
storage and reuse of topsoil as appropriate.
|
|
CM5
|
Hydroseeding or sheeting of soil stockpiles with
visually unobtrusive material (in earth tone).
|
|
CM6
|
Advance screen planting to noise barriers.
|
|
CM7
|
Control night-time lighting and glare by hooding all
lights.
|
|
CM8
|
Ensure no run-off into streams adjacent to Project
Area.
|
|
CM9
|
Protection of existing trees on boundary of project
area shall be carefully protected during construction. Detailed Tree Protection Specification
shall be provided in the Contract Specification. Under this specification,
the Contractor shall be required to submit, for approval, a detailed working
method statement for the protection of trees prior to undertaking any works
adjacent to all retained trees, including trees in contractor’s works
areas. (Tree protection measures will
be detailed at S16 and Tree Removal Application stage).
|
|
CM10
|
Trees unavoidably affected by the works shall be
transplanted where practical. Trees
should be transplanted straight to their destinations and not held in a
nursery. A detailed Tree Transplanting
Specification shall be provided in the Contract Specification, if applicable.
Sufficient time for necessary tree root and crown preparation periods shall
be allowed in the project programme.
|
Table 2.15: Proposed Operation Phase
Mitigation Measures
|
ID
No.
|
Landscape
Mitigation Measure
|
|
OM1
|
Compensatory Tree Planting for all felled trees shall
be provided to the satisfaction of relevant Government departments. Required numbers and locations of
compensatory trees shall be determined and agreed separately with Government
during the Tree Felling Application process under ETWBTC 3/2006.
|
|
OM2
|
A continuous belt of screen planting along southern
perimeter of project area with fast growing tree species. At least 450 trees capable of reaching a
height > 10m within 10 years should be planted. Planting of the belt of trees shall be
carried out as advance works ahead of other site formation and building
works.
|
|
OM3
|
Maximise soft landscape and amenity water bodies in
residential areas of the development.
Approximately 750 of trees (of Heavy Standard size) should be
planted. Where space permits, roadside
berms should be created. Street trees should be of species that reach a
mature height of no less than 15m.
|
|
OM4
|
Maximise freshwater habitat wetland creation
consistent with achieving other parameters.
Min 4.74 ha to be provided.
Wetlands must have natural edge profiles with >1m wide emergent zone. No access to the wetland by residents and
all wetlands must be screened from residential development by a continuous
tree screen at interface with residential development or earth mounding such
that disturbance is minimised. Implementation of the wetland shall be carried
out as advance works.
|
|
OM5
|
Use appropriate (visually unobtrusive and
non-reflective) building materials and colours in built structures.
|
|
OM6
|
During detailed design, refine building layout to
create a min 10m wide gap between buildings north of Wo Shang Wai pond and
also two min 10m wide gaps in the row of buildings adjacent to Royal Palms.
|
|
OM7
|
Streetscape elements (e.g. paving, signage, street
furniture, lighting etc.) shall be sensitively designed in a manner that
responds to the local context, and minimises potential negative landscape and
visual impacts. Lighting units should
be directional and minimise unnecessary light spill.
|
Impact monitoring for air quality (dust), noise and water quality
due to the construction work were undertaken during the reporting month in
compliance with the EM&A manual in the reporting period. Regular site
inspections were carried out on 10, 16 and 24 February 2011 in the reporting
month to assess the compliance with environmental requirements.
3.2.1.1
1-hr TSP
Results of 1-hour TSP at the four monitoring locations are
summarised in Table 3.1. Graphical plots of the monitoring results
are shown in Appendix F.
Table 3.1: Summary of 1-hour TSP monitoring results
|
Monitoring Date
|
Start Time
|
1-hr TSP (μg/m3)
|
Range (μg/m3)
|
Action Level (μg/m3)
|
Limit Level (μg/m3)
|
|
1st Result
|
2nd Result
|
3rd Result
|
|
ASR1
|
|
1-Feb-11
|
9:09
|
218
|
221
|
207
|
103 - 251
|
378
|
500
|
|
7-Feb-11
|
9:06
|
137
|
135
|
128
|
|
11-Feb-11
|
9:16
|
155
|
139
|
145
|
|
17-Feb-11
|
9:14
|
251
|
242
|
251
|
|
23-Feb-11
|
9:06
|
105
|
112
|
103
|
|
ASR2A
|
|
1-Feb-11
|
13:16
|
229
|
240
|
218
|
81 -
304
|
357
|
500
|
|
7-Feb-11
|
13:09
|
104
|
101
|
97
|
|
11-Feb-11
|
13:08
|
148
|
129
|
105
|
|
17-Feb-11
|
13:12
|
301
|
292
|
304
|
|
23-Feb-11
|
13:12
|
85
|
90
|
81
|
|
ASR3
|
|
1-Feb-11
|
13:02
|
201
|
215
|
225
|
94 -
317
|
358
|
500
|
|
7-Feb-11
|
12:53
|
126
|
118
|
115
|
|
11-Feb-11
|
12:51
|
158
|
128
|
141
|
|
17-Feb-11
|
12:56
|
278
|
312
|
317
|
|
23-Feb-11
|
12:56
|
101
|
102
|
94
|
|
ASR4
|
|
1-Feb-11
|
9:05
|
202
|
220
|
227
|
112 -
227
|
372
|
500
|
|
7-Feb-11
|
9:01
|
155
|
150
|
140
|
|
11-Feb-11
|
9:12
|
158
|
121
|
138
|
|
17-Feb-11
|
9:12
|
158
|
121
|
138
|
|
23-Feb-11
|
9:02
|
126
|
119
|
112
|
|
|
|
|
|
|
|
|
|
3.2.1.2
24-hr TSP
Results of 24-hour TSP at the four monitoring locations are
summarised in Table 3.2. Graphical plots of the monitoring results
are shown in Appendix F.
Table 3.2: Summary of 24-hour TSP monitoring results
|
Monitoring Date
|
Monitoring Results (μg/m3)
|
Range (μg/m3)
|
Action Level (μg/m3)
|
Limit Level (μg/m3)
|
|
ASR1
|
|
|
|
|
|
1-Feb-11
|
98
|
75 -
98
|
226
|
260
|
|
7-Feb-11
|
80
|
|
11-Feb-11
|
80
|
|
17-Feb-11
|
75
|
|
23-Feb-11
|
89
|
|
ASR2A
|
|
|
|
|
|
1-Feb-11
|
87
|
80 -
90
|
213
|
260
|
|
7-Feb-11
|
90
|
|
11-Feb-11
|
80
|
|
17-Feb-11
|
90
|
|
23-Feb-11
|
84
|
|
ASR3
|
|
|
|
|
|
1-Feb-11
|
98
|
85 -
98
|
205
|
260
|
|
7-Feb-11
|
97
|
|
11-Feb-11
|
85
|
|
17-Feb-11
|
90
|
|
23-Feb-11
|
88
|
|
ASR4
|
|
|
|
|
|
1-Feb-11
|
83
|
83 -
97
|
237
|
260
|
|
7-Feb-11
|
88
|
|
11-Feb-11
|
88
|
|
17-Feb-11
|
90
|
|
23-Feb-11
|
97
|
No exceedance of 1-hour and 24-hour TSP (Action or Limit Level) was
recorded in the reporting period.
The weather conditions in the reporting period are provided in Appendix G.
3.2.2
Construction Noise Monitoring
The construction noise monitoring results are summarized in Table 3.3.
Graphical plots of the monitoring data are shown in Appendix F.
Table 3.3: Summary of Construction
noise monitoring results
|
Monitoring Date
|
Start Time
|
Mean &
Range of Noise Levels, dB(A)
|
Limit Level
for Leq (dB)
|
|
Leq
|
L10
|
L90
|
|
NSR1
|
|
|
|
|
>
75
>
75
|
|
1-Feb-11
|
13:21
|
48
|
48
|
41
|
|
7-Feb-11
|
13:14
|
48
|
49
|
41
|
|
17-Feb-11
|
13:16
|
51
|
54
|
40
|
|
23-Feb-11
|
13:16
|
53
|
54
|
50
|
|
NSR3
|
|
|
|
|
|
1-Feb-11
|
14:23
|
48
|
49
|
44
|
|
7-Feb-11
|
14:16
|
48
|
50
|
44
|
|
17-Feb-11
|
14:19
|
48
|
49
|
45
|
|
23-Feb-11
|
14:20
|
48
|
50
|
46
|
|
NSR5
|
|
|
|
|
|
1-Feb-11
|
9:13
|
49
|
51
|
44
|
|
7-Feb-11
|
9:10
|
47
|
49
|
44
|
|
17-Feb-11
|
9:19
|
50
|
52
|
48
|
|
23-Feb-11
|
9:13
|
55
|
58
|
41
|
|
NSR7
|
|
|
|
|
|
1-Feb-11
|
10:18
|
62
|
64
|
58
|
|
7-Feb-11
|
10:14
|
60
|
63
|
56
|
|
17-Feb-11
|
10:24
|
63
|
65
|
60
|
|
23-Feb-11
|
10:21
|
65
|
67
|
62
|
No exceedance (Action/Limit Level) of construction noise was
recorded in the reporting period.
3.2.3
Water Quality Monitoring
The water quality monitoring results are summarized in Table 3.4. Graphical plots of the
monitoring data are shown in Appendix F.
Table 3.4: Summary
of Water quality
monitoring results
|
Monitoring Date
|
Temp
(oC)
|
pH
|
Dissolved Oxygen (mg/L)
|
DOS (%)
|
Turbidity (NT)
|
BOD (mg/L)
|
Suspended Solids (mg/L)
|
|
MP1
|
|
|
|
|
|
|
|
|
2/2/2011
|
14.2
|
7.8
|
9.2
|
89.8
|
7.9
|
<2
|
4
|
|
9/2/2011
|
19.8
|
7.0
|
8.0
|
87.4
|
8.3
|
2
|
11
|
|
11/2/2011
|
17.5
|
7.7
|
7.6
|
79.7
|
17.5
|
5
|
21
|
|
14/2/2011
|
14.1
|
7.8
|
8.7
|
85.2
|
9.5
|
2
|
4.5
|
|
16/2/2011
|
13.0
|
8.3
|
9.4
|
89.8
|
7.3
|
<2
|
5.5
|
|
18/2/2011
|
12.8
|
8.0
|
9.0
|
86.6
|
5.1
|
<2
|
2.5
|
|
21/2/2011
|
13.4
|
7.8
|
9.0
|
89.5
|
5.8
|
<2
|
5
|
|
23/2/2011
|
16.1
|
8.1
|
10.6
|
108.5
|
5.9
|
<2
|
5
|
|
25/2/2011
|
17.6
|
7.9
|
10.3
|
111.1
|
6.7
|
2
|
3.5
|
|
28/2/2011
|
20.1
|
7.3
|
5.9
|
68.6
|
50.7
|
4.5
|
48.5
|
|
Action Level
|
-
|
<5.5 or >7.5
|
<1.23
|
-
|
>173
|
-
|
>231
|
|
Limit
Level
|
-
|
<4.0 or >8.0
|
<1.17
|
-
|
>177
|
-
|
>299
|
|
|
|
|
|
|
|
|
|
|
MP2
|
|
|
|
|
|
|
|
|
2/2/2011
|
14.6
|
7.7
|
9.2
|
91.0
|
9.5
|
<2
|
9
|
|
9/2/2011
|
19.5
|
7.1
|
8.1
|
88.6
|
7.9
|
<2
|
8
|
|
11/2/2011
|
17.6
|
7.6
|
7.8
|
82.0
|
18.2
|
5
|
20
|
|
14/2/2011
|
14.3
|
7.7
|
8.8
|
85.9
|
9.6
|
<2
|
4
|
|
16/2/2011
|
13.0
|
7.9
|
9.3
|
88.7
|
8.2
|
<2
|
5.5
|
|
18/2/2011
|
12.9
|
7.9
|
8.9
|
85.3
|
7.6
|
<2
|
7.5
|
|
21/2/2011
|
13.9
|
8.0
|
9.2
|
90.8
|
8.2
|
<2
|
10
|
|
23/2/2011
|
16.2
|
7.8
|
9.9
|
101.1
|
9.8
|
<2
|
6.5
|
|
25/2/2011
|
18.2
|
7.9
|
10.1
|
107.4
|
13.5
|
3
|
15.5
|
|
28/2/2011
|
20.4
|
7.4
|
6.5
|
76.1
|
57.3
|
3
|
52
|
|
Action Level
|
-
|
<5.5 or >7.5
|
<1.04
|
-
|
>132
|
-
|
>170
|
|
Limit
Level
|
-
|
<4.0 or >8.0
|
<0.89
|
-
|
>163
|
-
|
>209
|
|
|
|
|
|
|
|
|
|
|
MP3
|
|
|
|
|
|
|
|
|
2/2/2011
|
13.9
|
8.0
|
9.9
|
96.1
|
17.9
|
5.5
|
19
|
|
9/2/2011
|
19.8
|
7.2
|
7.4
|
81.5
|
17.4
|
5
|
13.5
|
|
11/2/2011
|
19.1
|
7.3
|
6.6
|
71.7
|
17.2
|
5
|
15.5
|
|
14/2/2011
|
14.2
|
7.5
|
6.7
|
66.0
|
28.0
|
4
|
21
|
|
16/2/2011
|
13.0
|
7.7
|
7.4
|
70.9
|
26.3
|
4
|
22
|
|
18/2/2011
|
13.0
|
7.6
|
7.7
|
72.0
|
26.5
|
5
|
23.5
|
|
21/2/2011
|
13.1
|
7.4
|
9.7
|
94.4
|
26.1
|
5
|
21
|
|
23/2/2011
|
16.3
|
7.6
|
8.4
|
85.9
|
20.1
|
3.5
|
15.5
|
|
25/2/2011
|
17.8
|
7.6
|
8.7
|
82.5
|
29.6
|
5
|
25
|
|
28/2/2011
|
20.3
|
7.1
|
6.5
|
76.2
|
25.0
|
3.5
|
19
|
|
Action Level
|
-
|
<5.5 or >7.5
|
<6.85
|
-
|
>64
|
-
|
>65
|
|
Limit
Level
|
-
|
<4.0 or >8.0
|
<6.65
|
-
|
>67
|
-
|
>66
|
|
|
|
|
|
|
|
|
|
|
MP4
|
|
|
|
|
|
|
|
|
2/2/2011
|
15.0
|
7.3
|
7.3
|
73.8
|
31.3
|
4
|
24.5
|
|
9/2/2011
|
20.4
|
6.9
|
6.7
|
74.8
|
12.6
|
2.5
|
12
|
|
11/2/2011
|
18.3
|
7.1
|
5.7
|
61.0
|
19.6
|
3.5
|
16
|
|
14/2/2011
|
10.7
|
7.3
|
7.1
|
64.3
|
30.5
|
5
|
19
|
|
16/2/2011
|
13.3
|
7.7
|
8.8
|
84.4
|
29.9
|
10.5
|
21
|
|
18/2/2011
|
13.2
|
7.6
|
9.3
|
88.8
|
26.7
|
14
|
24.5
|
|
21/2/2011
|
13.4
|
7.5
|
8.4
|
83.3
|
19.6
|
4
|
15.5
|
|
23/2/2011
|
18.9
|
7.6
|
9.4
|
103.6
|
28.6
|
6
|
21
|
|
25/2/2011
|
19.0
|
7.5
|
8.7
|
101.9
|
87.2
|
13
|
80.5
|
|
28/2/2011
|
20.8
|
7.0
|
5.2
|
61.7
|
21.0
|
3
|
19
|
|
Action Level
|
-
|
<5.5 or >7.5
|
<3.91
|
-
|
>60
|
-
|
>50
|
|
Limit
Level
|
-
|
<4.0 or >8.0
|
<3.82
|
-
|
>64
|
-
|
>53
|
|
|
|
|
|
|
|
|
|
|
MP5
|
|
|
|
|
|
|
|
|
2/2/2011
|
15.1
|
7.1
|
7.6
|
76.5
|
35.8
|
5
|
34.5
|
|
9/2/2011
|
20.2
|
7.0
|
7.3
|
82.4
|
17.9
|
2
|
19.5
|
|
11/2/2011
|
18.4
|
7.0
|
6.7
|
72.1
|
24.0
|
2
|
18.5
|
|
14/2/2011
|
10.6
|
7.2
|
7.6
|
69.0
|
26.7
|
5
|
12
|
|
16/2/2011
|
13.2
|
7.6
|
9.1
|
87.0
|
33.2
|
17.5
|
28
|
|
18/2/2011
|
13.0
|
7.7
|
9.9
|
96.5
|
26.5
|
20.5
|
35
|
|
21/2/2011
|
13.1
|
7.6
|
9.1
|
89.9
|
25.5
|
4.5
|
21.5
|
|
23/2/2011
|
19.6
|
7.7
|
9.7
|
106.7
|
25.5
|
8
|
17.5
|
|
25/2/2011
|
19.8
|
7.6
|
8.8
|
103.8
|
52.4
|
6
|
45
|
|
28/2/2011
|
20.3
|
7.2
|
5.7
|
68.8
|
34.5
|
2
|
30
|
|
Action Level
|
-
|
<5.5 or >7.5
|
<4.13
|
-
|
>81
|
-
|
>66
|
|
Limit
Level
|
-
|
<4.0 or >8.0
|
<3.87
|
-
|
>84
|
-
|
>69
|
|
|
|
|
|
|
|
|
|
|
MP6
|
|
|
|
|
|
|
|
|
2/2/2011
|
15.4
|
6.9
|
6.9
|
70.2
|
30.9
|
#DIV/0!
|
23.5
|
|
9/2/2011
|
20.6
|
6.9
|
6.5
|
73.5
|
22.2
|
#DIV/0!
|
22.5
|
|
11/2/2011
|
18.9
|
6.9
|
6.4
|
70.3
|
18.3
|
2
|
13.5
|
|
14/2/2011
|
11.8
|
7.0
|
6.6
|
61.7
|
27.6
|
4
|
15
|
|
16/2/2011
|
13.1
|
7.7
|
9.4
|
89.4
|
24.8
|
15.5
|
21.5
|
|
18/2/2011
|
13.3
|
7.8
|
9.6
|
91.4
|
28.5
|
2
|
22
|
|
21/2/2011
|
13.5
|
7.4
|
9.3
|
91.8
|
19.1
|
2
|
13
|
|
23/2/2011
|
19.1
|
7.9
|
10.7
|
116.5
|
33.5
|
12
|
21.5
|
|
25/2/2011
|
19.3
|
7.7
|
8.0
|
94.0
|
32.7
|
3
|
31
|
|
28/2/2011
|
19.9
|
7.1
|
6.2
|
73.7
|
30.3
|
<2
|
24.5
|
|
Action Level
|
-
|
<5.5 or >7.5
|
<4.61
|
-
|
>94
|
-
|
>75
|
|
Limit
Level
|
-
|
<4.0 or >8.0
|
<4.52
|
-
|
>96
|
-
|
>75
|
Notes:
Values Bold indicate Action Level exceedance.
Values Underlined and Bold indicate
Limit Level exceedance.
Exceedance of pH exceedances were frequently observed at all monitoring
stations while a few occasions of DO exceedances were observed at MP3 during
the period. One occasion of
turbidity and SS exceedances was found at MP4 on 25 February 2011.
The Event
and Action Plan in Appendix D was followed under these cases of exceedances.
From
investigation, construction activities during the period of exceedance included
mainly band drain installation, trial embankment for ground improvement and
site formation (filling). It was observed that the Contractor has implemented
water quality mitigation measures as recommended in the EIA report, including
the provision of temporary drainage facility and associated treatment facility.
Sand bags are in place in the temporary drainage channel to enhance the
desilting efficiency. The Contractor further enhanced the water quality
mitigation measures by erecting several segments of rock bunds at the discharge
outlet to avoid site runoff draining directly to the northern ditches.
From investigation, there was no direct discharge from the site to the
ditch where MP1 and MP2 are located; while the fish pond nearby (MP3) was being
separated from the construction site by the WRA since November 2010, so the
exceedances were not considered to be related to the construction activities.
For other monitoring stations (MP4 to MP6), as there was only small amount of
site runoff generated and discharged in February and considered the similar pH
to other stations, the exceedance was considered not related to the project.
The exceedances of pH could be due to natural variations. Exceedances of DO at
MP3 maybe due to external factors such as pond fish culture activities which
were out of the control of the project.
Concerning the turbidity and SS exceedances at MP4, it was noted that there
was only small amount of site runoff generated. The monitoring station MP6
which is closer to the discharge point of the site has not shown any sign of
increase in turbidity (32.7 NTU) or SS (31 mg/L) on the same day. Therefore, it
can be concluded that the exceedance was not caused by this project and it has
been caused by some unknown factors.
This report documents surveys
conducted in the Survey Area between 1 February and 28 February 2011. The Wetland Restoration Area (hereafter WRA) is also surveyed as the
area is accessible and site formation works for WRA has been completed. The updated survey transect is provided in Figure 4.1. Dates and ecological surveys conducted during this period are
summarised in Appendix H.
Monitoring was undertaken following
the survey methodology in the EM&A Manual. In addition, low intensity
monitoring of the WRA was undertaken (on a monthly basis) to monitor faunal
usage of the newly formed cells; monitoring intensity will follow that outlined
in the EM&A Manual at the completion of the WRA. A transect was followed in
the bird surveys (see Figure 4.1). All bird species of conservation importance and/or wetland dependent
were identified and enumerated. Flying birds were not recorded unless they were
foraging and associated with the habitat (such as swifts). Further, notable
bird observations during other surveys were also recorded.
Bird surveys were conducted on a
weekly basis. A total of 40 bird species of conservation
importance and/or wetland-dependence were recorded within 500 m of the Project
Site while 22 bird species were recorded in the WRA. Of the 22 species recorded within the WRA, 17 of them were species of conservation importance and/or wetland-dependent
species. Species prone to disturbance were also recorded regularly on-site;
these include three duck species and five ardeid species. It is noted that 41
Black-faced Spoonbill were recorded in Cell 2 of the WRA; this is approximately
9% of the Deep Bay wintering population (based on
findings from 2010 International Black-faced Spoonbill Census). This species is of global concern and listed as endangered in the IUCN red list. A
summary of survey data is provided in Appendix I.
Species and numbers recorded in this
survey period are typical of fish pond areas in winter indicating that birds in
the area are not presently being adversely affected by the construction of the
Wetland Restoration Area.
No herpetofauna surveys were
scheduled in the period.
No amphibian species or reptile
species were recorded in other surveys.
No dragonfly and butterfly surveys
were scheduled in the period.
Monitoring of mammals was conducted concurrently with
other surveys. No mammals were recorded in the survey period.
No ecological issues or management activities were
identified.
Ecological
monitoring during February 2011 was carried out following the survey
methodology and frequency outlined in the EM&A Manual.
A total
of 40 bird species were recorded in the survey area (including WRA). Survey
findings indicate that the ponds within the Survey Area supported numbers and
diversity of wetland-dependent birds and other species of conservation
importance typical of fish pond areas in the winter months.
22 bird
species were recorded in the WRA. These findings indicate that the WRA is
already supporting wetland-dependent birds and other species of conservation
importance.
No herpetofauna surveys were
scheduled in the period while no amphibian species or reptile species were
recorded in other surveys. There were no dragonfly and butterfly surveys
scheduled in the reporting month. On the other hand, no mammal was recorded
during the monitoring conducted concurrent with other surveys.
The EM&A programme for
Landscape and Visual impact due to the construction commenced in May 2010 and
was continued during the reporting period. Site inspections on Landscape and
Visual impact were carried out on 9 and 23 February 2011 to confirm the
implementation of mitigation measures at construction stage.
The audit
was undertaken with references to the specific checklists provided in Tables 2.13 – 2.15 and audit results
are summarized as below:
Table 5.1: Construction and Operation
Phase Audit Summary
|
Area of Works
|
Items to be Monitored
|
|
Works Area
|
The
boundaries of the works area have been established on site in accordance
with the contract documents and approved plans (EP), and the limit of
current heavy construction activity is now confined to within the site
hoardings (North side of the site / access road) and the noise barriers
(other sides of the site). Minor works such as horticultural maintenance of
the planting and transplanted trees, and boundary fence repair was
proceeding along the Royal Palms - Palm
Springs boundary.
No
construction works were observed to have exceeded the site boundaries.
Moreover, no construction
was carried out at the wetland restoration area after 15 November 2010.
|
|
Protection of
all trees and woodland blocks to be retained
|
Trees to be retained within the site, located northeast boundary
alongside wetland restoration area, have been identified and protected by temporary
protective fencing.
|
|
Streams
|
The
works site is encircled by a berm to intercept surface water and prevent it
from washing off into any of the neighboring sites. Surface water is collected within the site
in a temporary drainage channel.
Gravels beds and barriers have been installed to filter site runoff,
sedimentation tanks provided to enable primary treatment before discharge to
mains drains.
|
|
Clearance of
existing vegetation
|
Site clearance was completed prior to the commencement of
construction. A bed of existing Phragmites reeds which have been
retained within a fenced off area at the centre of the site and some reed
clumps have been reused in the vegetation of the wetland restoration area.
|
|
Transplanting
of trees
|
Tree
transplanting has been completed, with the trees relocated to various points
within the planting strip along the southern boundary of the site, outside
the noise barrier. The trees continue
to re-establish well.
|
|
Topsoil
stripping
|
Suitable
pond bund and pond bottom material excavated and stockpiled from the
original site has now been re-used in the formation of the wetland areas.
Active
dust suppression measures are still being adopted along internal site access
tracks.
|
|
New buildings
|
No
new permanent buildings have yet been constructed on site.
|
|
Boundaries
|
Hoardings
have been erected along most of the boundaries of the site. Installation of new fence between the
future residential sites and the constructed wetland area is complete. Fence
has been being painted green to match with the surrounding vegetated
environment.
|
|
Noise Barrier
|
Noise barriers have been
installed along the southern and western boundaries of the site in accordance
with the contract requirements.
The noise barrier design complies
with the mitigation requirements, with upper 6 to 7m portion of the barrier
being made from a translucent material with green tinted (to match with the
environment). Supporting GMS structure, likewise, has been painted green.
|
|
Night-time
lighting
|
No night-time works were reported
to have been carried out during the monitoring period.
|
|
Landscape and
wetland treatments
|
Continuous belt of screen planting along the southern and western
boundaries of the site has been completed.
The formation, soiling and water control structures for all cells of
the wetland restoration area has been completed. Rain water has partially
filled some wetland cells. The clumps of Phragmites australis reeds from the original site have been successively translocated to
the edge of the cells in wetland restoration area.
No construction
was carried out at the wetland restoration area after 15 November 2010.
|
|
Soiling
|
The
soiling for the advance planting strip has been completed. Some bricks have been installed to create
a stronger edge of planting bed and to prevent soil erosion. The soil
placement and grading for the wetland restoration area is complete.
|
|
Plant supply
|
The plant material used for the Advance Planting Strip along the
southern and western boundaries of the site are all common species and came
from commercial sources.
Details of the procurement of
special plant material for the wetland areas are to be provided in wet
season of 2011, when nursery supplies become available.
|
|
Planting
|
The total number of trees that will reach a minimum of 10m in the
advance planting strip meet the contract requirements. The tree species are all from the approved
list. This planting should achieve
the required screening effect.
Dead planted trees (Eucalyptus) should be replaced and the
health of condition of the replacement trees should be monitored
closely.
Understorey planting in poor health were observed. Replacement or
repairing works should be carried for these planting of poor health.
|
|
Establishment
Works
|
The
advance planting, the compensatory planting and the transplanted trees have
not yet been hand over for maintenance, the planting works are under
supervision onsite to ensure that the requirements of the approved planting
proposal are met. The advance planting is currently being maintained by the
landscape sub-contractor.
|
The ET had carried out construction
phase weekly site inspections on 10, 16 and 24 February 2011. All observations
have been recorded in the site inspection checklist and passed to the
Contractor together with the appropriate recommended mitigation measures where
necessary. The key observations from site inspections and associated recommendations
are summarized in Table 6.1.
Table 6.1: Summary
of Site Inspections and Recommendations
|
Key Observations
|
ET Recommendation
|
Contractor’s Responses / Action(s) Undertaken
|
Close-out (Date)
|
|
One of the AquaSed not
repaired yet
|
To repair the AquaSed
before rainy season
|
Agreed and action to be
taken
|
In progress
|
|
General refuse inside
drainage channel
|
To collect the general
refuse in the site regularly
|
Agreed and action taken
|
16 Feb 2011
|
|
Stockpiles not covered
|
To cover the stockpiles
with tarpaulin or level the stockpiles and provide compaction
|
Agreed and action taken
|
2 Mar 2011
|
|
Slope surface of large
stockpile not covered
|
To cover the slope with
tarpaulin
|
The entrance was paved
with concrete after band drain installation
|
2 Mar 2011
|
The Contractor has been registered as a
chemical waste producer for the Project. Construction and demolition (C&D)
material sorting was carried out on site. A sufficient number of receptacles were
available for general refuse collection.
As advised by the Contractor, 0 tonnes of C&D material were generated
on site during the period. No metals was generated and collected by registered
recycling collector. No paper cardboard packing and plastic were generated on
site and collected by registered recycling collector. No chemical waste was
generated and collected by licensed chemical waste collector. 1.5 tonnes of other types of wastes
(e.g. general refuse) was generated on site and disposed of at public landfill
facility at NENT.
The Contractor is advised to maintain on
site waste sorting and recording system and maximize reuse/recycling of C&D
wastes.
The environmental permits, licenses, and/or
notifications on environmental protection for this Project which were valid during
the period is summarised in Table 6.2.
Table 6.2: Status
of Environmental Submissions, Licenses and Permits
|
Statutory Reference
|
Description
|
Permit /Reference
No.
|
Status
|
|
EIAO
|
Environmental Permit
|
EP-311/2008B
|
Valid
|
|
APCO
|
Notification of
Construction Work under APCO
|
316688
(27
Apr 2010)
|
Valid
|
|
WPCO
|
Discharge
License
|
WT00007442-2010
(2
Nov 2010)
|
Valid
|
|
WDO
|
Registration as Chemical
Waste Producer
|
WPN0000-542-H3083-04
|
Valid
|
|
WDO
|
Bill Account for
disposal
|
700945423
|
Valid
|
Legend: EIAO – Environmental Impact Assessment
Ordinance
APCO – Air Pollution
Control Ordinance
WPCO – Water Pollution
Control Ordinance
WDO – Waste Disposal
Ordinance
The EM&A programme followed the
recommended mitigation measures in the EM&A manual. The EM&A
requirements as well as the summary of implementation status of the
environmental mitigation measures are provided in Appendix K. In particular, the following
mitigation measures were brought to attention during the site audits:
Air Quality
·
All
stockpiles should be
covered by tarpaulin or kept wet by water spraying;
·
All
vehicles should be washed to remove any dusty materials before leaving the
construction sites;
·
the
portion of road leading the construction site that is within 30m of a designated vehicle entrance or
exit should be kept clear of dusty materials;
·
During the dry season, sufficient water spraying
should be provided at haul road to reduce dust emission; and
·
Ensure proper functioning of the wheel wash facility.
Noise
·
Mobile
plant should be sited
as far away from NSRs as possible;
·
Plant
known to emit noise strongly in one direction should be orientated to direct
noise away from the NSRs; and
·
The construction activities should be better scheduled to reduce noise nuisance.
Water Quality
·
Water accumulated in the site (including water inside
drip trays) should be cleared frequently;
·
Ensure
proper functioning of the wastewater
treatment facility; and
·
Silt and debris should be removed from the temporary
drainage channel regularly.
Waste management
·
Reuse the excavated materials as far as practical to
reduce the amount of waste disposal;
·
Ensure drip trays are provided for chemical containers
to prevent leakage or soil contamination;
·
All
plants and vehicles should be properly maintained to prevent oil leakage;
·
Oil
stains on soil should be cleared by disposal of contaminated soil; and
There
is no breach of Action or Limit Levels for Air Quality and Noise monitoring in
the reporting month.
Exceedances
of Action and Limit Levels were recorded for Water Quality at MP1, MP2, MP3,
MP4, MP5 and MP6 on different monitoring dates. Among the different parameters monitored, exceedances of pH were
frequently observed during the reporting period; the limit levels of turbidity
and SS at MP4 were exceeded on 25 February 2011. There were also a few
occasions of DO exceedance at MP3.
Table 7.1: Summary
of exceedances in Water Quality
|
Monitoring Date
|
pH
|
Dissolved Oxygen (mg/L)
|
Turbidity (NT)
|
Suspended Solids (mg/L)
|
|
MP1
|
|
|
|
|
|
2/2/2011
|
7.8
|
9.2
|
7.9
|
4
|
|
11/2/2011
|
7.7
|
7.6
|
17.5
|
21
|
|
14/2/2011
|
7.8
|
8.7
|
9.5
|
4.5
|
|
16/2/2011
|
8.3
|
9.4
|
7.3
|
5.5
|
|
18/2/2011
|
8.0
|
9.0
|
5.1
|
2.5
|
|
21/2/2011
|
7.8
|
9.0
|
5.8
|
5
|
|
23/2/2011
|
8.1
|
10.6
|
5.9
|
5
|
|
25/2/2011
|
7.9
|
10.3
|
6.7
|
3.5
|
|
Action Level
|
<5.5 or >7.5
|
<1.23
|
>173
|
>231
|
|
Limit
Level
|
<4.0 or >8.0
|
<1.17
|
>177
|
>299
|
|
|
|
|
|
|
|
MP2
|
|
|
|
|
|
2/2/2011
|
7.7
|
9.2
|
9.5
|
9
|
|
11/2/2011
|
7.6
|
7.8
|
18.2
|
20
|
|
14/2/2011
|
7.7
|
8.8
|
9.6
|
4
|
|
16/2/2011
|
7.9
|
9.3
|
8.2
|
5.5
|
|
18/2/2011
|
7.9
|
8.9
|
7.6
|
7.5
|
|
21/2/2011
|
8.0
|
9.2
|
8.2
|
10
|
|
23/2/2011
|
7.8
|
9.9
|
9.8
|
6.5
|
|
25/2/2011
|
7.9
|
10.1
|
13.5
|
15.5
|
|
Action Level
|
<5.5 or >7.5
|
<1.04
|
>132
|
>170
|
|
Limit
Level
|
<4.0 or >8.0
|
<0.89
|
>163
|
>209
|
|
|
|
|
|
|
|
MP3
|
|
|
|
|
|
2/2/2011
|
8.0
|
9.9
|
17.9
|
19
|
|
11/2/2011
|
7.3
|
6.6
|
17.2
|
15.5
|
|
14/2/2011
|
7.5
|
6.7
|
28.0
|
21
|
|
16/2/2011
|
7.7
|
7.4
|
26.3
|
22
|
|
18/2/2011
|
7.6
|
7.7
|
26.5
|
23.5
|
|
23/2/2011
|
7.6
|
8.4
|
20.1
|
15.5
|
|
25/2/2011
|
7.6
|
8.7
|
29.6
|
25
|
|
28/2/2011
|
7.1
|
6.5
|
25.0
|
19
|
|
Action Level
|
<5.5 or >7.5
|
<6.85
|
>64
|
>65
|
|
Limit
Level
|
<4.0 or >8.0
|
<6.65
|
>67
|
>66
|
|
|
|
|
|
|
|
MP4
|
|
|
|
|
|
16/2/2011
|
7.7
|
8.8
|
29.9
|
21
|
|
18/2/2011
|
7.6
|
9.3
|
26.7
|
24.5
|
|
23/2/2011
|
7.6
|
9.4
|
28.6
|
21
|
|
25/2/2011
|
7.5
|
8.7
|
87.2
|
80.5
|
|
Action Level
|
<5.5 or >7.5
|
<3.91
|
>60
|
>50
|
|
Limit
Level
|
<4.0 or >8.0
|
<3.82
|
>64
|
>53
|
|
|
|
|
|
|
|
MP5
|
|
|
|
|
|
16/2/2011
|
7.6
|
9.1
|
33.2
|
28
|
|
18/2/2011
|
7.7
|
9.9
|
26.5
|
35
|
|
21/2/2011
|
7.6
|
9.1
|
25.5
|
21.5
|
|
23/2/2011
|
7.7
|
9.7
|
25.5
|
17.5
|
|
25/2/2011
|
7.6
|
8.8
|
52.4
|
45
|
|
Action Level
|
<5.5 or >7.5
|
<4.13
|
>81
|
>66
|
|
Limit
Level
|
<4.0 or >8.0
|
<3.87
|
>84
|
>69
|
|
|
|
|
|
|
|
MP6
|
|
|
|
|
|
16/2/2011
|
7.7
|
9.4
|
24.8
|
21.5
|
|
18/2/2011
|
7.8
|
9.6
|
28.5
|
22
|
|
23/2/2011
|
7.9
|
10.7
|
33.5
|
21.5
|
|
25/2/2011
|
7.7
|
8.0
|
32.7
|
31
|
|
Action Level
|
<5.5 or >7.5
|
<4.61
|
>94
|
>75
|
|
Limit
Level
|
<4.0 or >8.0
|
<4.52
|
>96
|
>75
|
Notes:
Values Bold indicate Action Level exceedance.
Values Underlined and Bold indicate
Limit Level exceedance.
No
environmental complaint was received the reporting month.
No
notifications of summons or successful prosecution were received the reporting month.
Investigations have been carried out to identify
the causes of exceedance.
From investigation, construction activities
during the period of exceedance included mainly band drain installation, trial
embankment and site formation (filling). It was observed that the Contractor
has implemented water quality mitigation measures as recommended in the EIA
report, including the provision of temporary drainage facility and associated
treatment facility. Sand bags are in place in the temporary drainage channel to
enhance the desilting efficiency. The Contractor further enhanced the water
quality mitigation measures by erecting several segments of rock bunds at the
discharge outlet to avoid site runoff draining directly to the northern
ditches.
With external factors
affect the adjacent environments, such as natural variations, pond fish culture
activities and some unknown factors, the exceedances were considered not due to
construction works
As non-compliances have been recorded, the
Event and Action Plan has been followed. Although it is considered that the
exceedances were not related to the Project, the Contractor was reminded to
implement the water quality mitigation measures in accordance with the
recommendation stated in Section 5.6.1 – 5.6.4 of the EIA Report as far as
practicable and regular spot check would be conducted on the nearby discharge
by Contractor and inform ET for investigation.
To cater for the site runoff in the previous
months, the Contractor has further enhanced the water quality mitigation
measures by erecting several segments of rock bunds at the discharge outlet to
avoid site runoff draining directly to the northern ditches.
It was also advised that the operation
condition of the Wastewater Treatment Facilities should be checked regularly to
ensure proper functioning of the plant and good quality of effluent discharge.
Cumulative statistics for complaints, notifications of summons and
successful prosecutions for the Project account for period starting from the
date of commencement of construction (i.e. 12 May 2010) to the end of the
reporting month and are summarized in the Table
7.2 below.
Table 7.2: Statistics for complaints,
notifications of summons and successful prosecutions
|
Reporting Period
|
Cumulative
Statistics
|
|
|
Complaints
|
Notifications
of summons
|
Successful
prosecutions
|
|
This reporting month (Feb
2011)
|
0
|
0
|
0
|
|
From 12 May 2010 to end
of the reporting month (Feb 2011)
|
0
|
0
|
0
|
The major site works to be commissioned in
the coming month include:
¡
Installation of Band Drain; and
¡
Trial Embankment for Ground Improvement
¡
Site Formation (Filling)
Key issues to be considered in the coming month include:
¡
Generation of dust from activities on-site (esp. stockpiling for
Trial Embankment) during dry weather condition;
¡
Noise impact from operating equipment and machinery on-site;
¡
Generation of site surface runoffs and wastewater from activities
on-site;
¡
Sorting, recycling, storage and disposal of general refuse and
construction waste from activities on-site; and
¡
Management of chemicals and avoidance of oil spillage on-site and to the
drainage.
The environmental site inspection and environmental monitoring will be continued in the coming month. Impact monitoring for air, noise, water
quality, ecology and
landscape and visual in accordance with the approved
EM&A Manual has commenced since 12 May 2010. The tentative monitoring
schedule for March 2011 is shown in the Table
8.1.
Table 8.1: Tentative
Environmental Monitoring and Audit Schedule for March 2011
8.4.1
Conclusions
The EM&A programme as recommended in the
EM&A manual has been undertaken in the reporting month since 12 May 2010.
Monitoring of Air Quality, Noise, Water
Quality, Ecology and Landscape and Visual impacts due to the Project was under
way. In particular, the 1-hr TSP, 24-hr TSP, noise level (as Leq)
and water quality parameters (such as pH, DO and SS) under monitoring have been
checked against established Action and Limit levels.
There was no breach of Action and Limit
Levels for 1-hr TSP, 24-hr TSP and noise in the reporting month.
Exceedances of Action and Limit Levels were
recorded for Water Quality at MP1, MP2, MP3, MP4, MP5 and MP6 on different monitoring
dates. Exceedances of
pH were frequently observed during the reporting period. The limit levels of
turbidity and SS at MP4 were exceeded on 25 February 2011. There were also a
few occasions of DO exceedance at MP3. However, Investigations on the exceedance
showed that the exceedances were not related to the Project and may have been
due to external factors such as natural variations, pond fish culture
activities and some unknown factors.
8.4.2
Recommendations
With
considerations on the construction activities and environment, the following
recommendations were provided:
Air Quality
·
All stockpiles should be covered by tarpaulin or kept
wet by water spraying;
·
All
vehicles should be washed to remove any dusty materials before leaving the
construction sites;
·
the
portion of road leading the construction site that is within 30m of a designated vehicle entrance or
exit should be kept clear of dusty materials;
·
Sufficient water spraying should be provided at haul
road to reduce dust emission, especially during dry weather conditions; and
·
Ensure proper functioning of the wheel wash facility.
Noise
·
Mobile plant should be sited as far away from NSRs as
possible;
·
Plant
known to emit noise strongly in one direction should be orientated to direct
noise away from the NSRs; and
·
The
construction activities should be better scheduled to reduce noise nuisance.
Water Quality
·
Water accumulated in the site (including water inside
drip trays) should be cleared frequently;
·
Ensure
proper functioning of the wastewater treatment facility; and
·
Silt and debris should be removed from the temporary
drainage channel regularly.
Waste management
·
Reuse the excavated materials as far as practical to
reduce the amount of waste disposal;
·
Ensure drip trays are provided for chemical containers
to prevent leakage or soil contamination;
·
All
plants and vehicles should be properly maintained to prevent oil leakage;
·
Oil
stains on soil should be cleared by disposal of contaminated soil;
