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-311/2008A) for
construction of the comprehensive development in Wo Shang Wai was granted by
EPD on 9 September 2008. 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 12 May to 31 May 2010.
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:
¡
Site formation for Wetland Restoration Area (WRA);
¡
Band
drain work preparation; and
¡
Temporary drainage work
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.
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
|
8520 Dust Track
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 prior to the commencement
of baseline monitoring.
·
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 baseline monitoring.
·
Calibration records for HVS and 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-73
|
|
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
|
09K100735
|
|
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 baseline 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 middepth 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 12,
20 and 26 May 2010 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
|
|
12-May-10
|
12:50
|
87
|
81
|
77
|
48 - 87
|
378
|
500
|
|
18-May-10
|
12:55
|
56
|
58
|
52
|
|
24-May-10
|
12:50
|
61
|
58
|
57
|
|
28-May-10
|
12:54
|
48
|
56
|
52
|
|
ASR2A
|
|
13-May-10
|
12:45
|
82
|
86
|
89
|
42 - 89
|
357
|
500
|
|
19-May-10
|
12:45
|
51
|
61
|
68
|
|
25-May-10
|
12:48
|
51
|
49
|
53
|
|
31-May-10
|
12:50
|
42
|
52
|
47
|
|
ASR3
|
|
13-May-10
|
8:40
|
87
|
78
|
72
|
41 - 87
|
358
|
500
|
|
19-May-10
|
8:55
|
63
|
62
|
58
|
|
25-May-10
|
8:57
|
69
|
65
|
59
|
|
31-May-10
|
9:03
|
50
|
41
|
45
|
|
ASR4
|
|
12-May-10
|
8:10
|
107
|
101
|
121
|
36 - 121
|
372
|
500
|
|
18-May-10
|
8:48
|
56
|
72
|
61
|
|
24-May-10
|
9:02
|
91
|
100
|
87
|
|
28-May-10
|
9:09
|
36
|
42
|
59
|
|
|
|
|
|
|
|
|
|
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
|
|
|
|
|
|
12-May-10
|
50
|
50 - 75
|
226
|
260
|
|
18-May-10
|
75
|
|
25-May-10
|
91
|
|
28-May-10
|
90
|
|
ASR2A
|
|
|
|
|
|
13-May-10
|
60
|
60 - 83
|
213
|
260
|
|
19-May-10
|
69
|
|
25-May-10
|
83
|
|
31-May-10
|
79
|
|
ASR3
|
|
|
|
|
|
13-May-10
|
45
|
45 - 100
|
205
|
260
|
|
18-May-10
|
83
|
|
25-May-10
|
93
|
|
31-May-10
|
100
|
|
ASR4
|
|
|
|
|
|
12-May-10
|
45
|
45 - 97
|
237
|
260
|
|
18-May-10
|
72
|
|
25-May-10
|
97
|
|
28-May-10
|
88
|
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
|
|
13-May-10
|
13:10
|
58
|
61
|
52
|
|
19-May-10
|
10:12
|
51
|
54
|
46
|
|
25-May-10
|
13:55
|
56
|
57
|
52
|
|
31-May-10
|
13:10
|
58
|
62
|
50
|
|
NSR3
|
|
|
|
|
|
13-May-10
|
8:55
|
68
|
74
|
49
|
|
19-May-10
|
9:12
|
52
|
55
|
48
|
|
25-May-10
|
9:14
|
57
|
58
|
47
|
|
31-May-10
|
9:28
|
54
|
55
|
48
|
|
NSR5*
|
|
|
|
|
|
12-May-10
|
13:08
|
58
|
59
|
56
|
|
18-May-10
|
13:05
|
56
|
58
|
53
|
|
24-May-10
|
13:08
|
58
|
59
|
56
|
|
NSR7*
|
|
|
|
|
|
12-May-10
|
9:22
|
66
|
69
|
63
|
|
18-May-10
|
10:55
|
65
|
67
|
62
|
|
24-May-10
|
11:10
|
63
|
65
|
59
|
* Only
3 monitoring events in May 2010 and monitoring to be carried out in the first week
of June 2010.
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
|
|
|
|
|
|
|
|
|
12/5/2010
|
25.4
|
7.3
|
1.6
|
19.8
|
19.7
|
4.0
|
27.5
|
|
14/5/2010
|
26.4
|
7.3
|
2.2
|
27.9
|
30.5
|
5.0
|
34.0
|
|
18/5/2010
|
26.4
|
7.3
|
2.5
|
30.6
|
88.9
|
3.0
|
82.0
|
|
20/5/2010
|
26.7
|
7.5
|
1.3
|
16.5
|
102.0
|
3.0
|
95.0
|
|
22/5/2010
|
28.0
|
7.4
|
2.8
|
35.5
|
21.3
|
4.0
|
24.0
|
|
24/5/2010
|
25.5
|
7.4
|
2.8
|
34.2
|
22.9
|
4.0
|
23.5
|
|
26/5/2010
|
28.0
|
7.4
|
1.8
|
23.3
|
27.6
|
4.0
|
26.0
|
|
28/5/2010
|
27.4
|
7.3
|
1.7
|
21.4
|
22.7
|
4.0
|
36.5
|
|
31/5/2010
|
26.8
|
7.3
|
2.1
|
26.8
|
26.8
|
4.5
|
35.0
|
|
Action Level
|
-
|
<5.5 or
>7.5
|
<1.23
|
-
|
>173
|
-
|
>231
|
|
Limit Level
|
-
|
<4.0 or
>8.0
|
<1.17
|
-
|
>177
|
-
|
>299
|
|
|
|
|
|
|
|
|
|
|
MP2
|
|
|
|
|
|
|
|
|
12/5/2010
|
26.7
|
7.5
|
5.1
|
64.2
|
26.7
|
4.0
|
18.5
|
|
14/5/2010
|
25.7
|
7.4
|
2.3
|
28.2
|
18.7
|
5.0
|
17.0
|
|
18/5/2010
|
26.6
|
7.4
|
4.9
|
60.4
|
21.4
|
2.0
|
23.0
|
|
20/5/2010
|
26.1
|
7.5
|
4.1
|
51.0
|
106.5
|
4.5
|
180.0
|
|
22/5/2010
|
27.0
|
7.4
|
2.8
|
35.0
|
25.0
|
2.0
|
21.0
|
|
24/5/2010
|
24.7
|
7.3
|
2.1
|
25.4
|
29.7
|
5.0
|
29.0
|
|
26/5/2010
|
27.6
|
7.5
|
3.2
|
41.3
|
25.5
|
5.0
|
25.5
|
|
28/5/2010
|
27.2
|
7.4
|
2.8
|
36.5
|
16.4
|
4.0
|
19.0
|
|
31/5/2010
|
26.7
|
7.3
|
2.1
|
26.1
|
30.6
|
<0.2
|
31.5
|
|
Action Level
|
-
|
<5.5 or
>7.5
|
<1.04
|
-
|
>132
|
-
|
>170
|
|
Limit Level
|
-
|
<4.0 or
>8.0
|
<0.89
|
-
|
>163
|
-
|
>209
|
|
|
|
|
|
|
|
|
|
|
MP3
|
|
|
|
|
|
|
|
|
12/5/2010
|
25.9
|
9.0
|
11.1
|
138.4
|
123.5
|
16.0
|
125.5
|
|
14/5/2010
|
25.9
|
7.8
|
6.3
|
78.5
|
136.5
|
13.5
|
135.5
|
|
18/5/2010
|
29.0
|
8.3
|
10.0
|
132.0
|
70.7
|
15.0
|
79.0
|
|
20/5/2010
|
27.2
|
8.5
|
10.0
|
126.3
|
148.0
|
12.5
|
180.0
|
|
22/5/2010
|
28.3
|
7.4
|
4.5
|
58.8
|
74.9
|
11.0
|
73.0
|
|
24/5/2010
|
24.7
|
7.6
|
4.9
|
59.5
|
120.5
|
11.0
|
115.0
|
|
26/5/2010
|
27.7
|
8.0
|
8.2
|
104.7
|
108.5
|
18.0
|
103.5
|
|
28/5/2010
|
28.3
|
7.8
|
4.8
|
63.4
|
59.2
|
7.0
|
67.0
|
|
31/5/2010
|
27.5
|
8.1
|
7.2
|
91.8
|
60.9
|
7.0
|
71.0
|
|
Action Level
|
-
|
<5.5 or
>7.5
|
<6.85
|
-
|
>64
|
-
|
>65
|
|
Limit Level
|
-
|
<4.0 or
>8.0
|
<6.65
|
-
|
>67
|
-
|
>66
|
|
|
|
|
|
|
|
|
|
|
MP4
|
|
|
|
|
|
|
|
|
12/5/2010
|
26.0
|
7.4
|
4.8
|
58.9
|
36.1
|
5.0
|
31.5
|
|
14/5/2010
|
26.6
|
7.2
|
5.2
|
64.1
|
37.1
|
5.0
|
31.0
|
|
18/5/2010
|
27.9
|
7.0
|
0.8
|
10.2
|
45.4
|
4.0
|
30.5
|
|
20/5/2010
|
25.3
|
7.3
|
1.2
|
15.0
|
72.9
|
4.5
|
78.0
|
|
22/5/2010
|
27.5
|
7.0
|
0.8
|
9.9
|
27.5
|
2.5
|
23.0
|
|
24/5/2010
|
25.5
|
7.0
|
1.1
|
13.8
|
29.4
|
5.0
|
21.5
|
|
26/5/2010
|
26.4
|
7.0
|
0.9
|
10.5
|
40.4
|
4.0
|
19.0
|
|
28/5/2010
|
27.7
|
7.1
|
1.3
|
17.2
|
28.6
|
4.0
|
31.0
|
|
31/5/2010
|
26.7
|
7.1
|
1.2
|
15.7
|
22.3
|
<2
|
25.5
|
|
Action Level
|
-
|
<5.5 or
>7.5
|
<3.91
|
-
|
>60
|
-
|
>50
|
|
Limit Level
|
-
|
<4.0 or
>8.0
|
<3.82
|
-
|
>64
|
-
|
>53
|
|
|
|
|
|
|
|
|
|
|
MP5
|
|
|
|
|
|
|
|
|
12/5/2010
|
25.3
|
7.7
|
3.7
|
43.9
|
101.6
|
8.0
|
74.5
|
|
14/5/2010
|
26.4
|
7.4
|
2.4
|
30.2
|
53.0
|
5.0
|
37.0
|
|
18/5/2010
|
28.2
|
7.4
|
2.7
|
33.9
|
34.8
|
6.0
|
18.5
|
|
20/5/2010
|
26.2
|
7.6
|
1.8
|
22.2
|
111.5
|
3.0
|
83.5
|
|
22/5/2010
|
28.1
|
7.2
|
1.4
|
18.3
|
48.9
|
3.5
|
48.5
|
|
24/5/2010
|
25.3
|
7.2
|
1.2
|
14.9
|
27.9
|
5.0
|
18.5
|
|
26/5/2010
|
27.6
|
7.3
|
2.8
|
34.6
|
39.7
|
5.5
|
33.0
|
|
28/5/2010
|
27.7
|
7.4
|
3.3
|
41.6
|
33.6
|
6.0
|
30.0
|
|
31/5/2010
|
26.8
|
7.3
|
2.0
|
25.8
|
48.4
|
3.5
|
43.5
|
|
Action Level
|
-
|
<5.5 or
>7.5
|
<4.13
|
-
|
>81
|
-
|
>66
|
|
Limit Level
|
-
|
<4.0 or
>8.0
|
<3.87
|
-
|
>84
|
-
|
>69
|
|
|
|
|
|
|
|
|
|
|
MP6
|
|
|
|
|
|
|
|
|
12/5/2010
|
25.6
|
7.9
|
2.8
|
34.2
|
232.0
|
9.0
|
224.5
|
|
14/5/2010
|
26.1
|
7.6
|
1.0
|
12.0
|
123.0
|
12.0
|
84.5
|
|
18/5/2010
|
29.0
|
8.1
|
4.4
|
57.2
|
61.9
|
10.5
|
49.5
|
|
20/5/2010
|
26.9
|
7.8
|
3.7
|
46.4
|
62.8
|
2.0
|
52.0
|
|
22/5/2010
|
27.6
|
7.9
|
1.7
|
20.6
|
31.2
|
4.0
|
19.5
|
|
24/5/2010
|
25.6
|
7.6
|
1.4
|
16.9
|
24.2
|
4.0
|
13.0
|
|
26/5/2010
|
27.3
|
7.5
|
2.0
|
24.3
|
32.8
|
3.0
|
22.0
|
|
28/5/2010
|
28.2
|
7.7
|
3.1
|
39.6
|
41.4
|
5.0
|
38.5
|
|
31/5/2010
|
26.7
|
7.6
|
1.7
|
22.7
|
86.4
|
<2
|
72.0
|
|
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.
Exceedances of pH, DO, turbidity and
SS were observed. For MP2, there was exceedance of action level for SS on 20
May 2010. For MP3, there were exceedances of pH, DO, turbidity and SS (action
and limit levels) on different monitoring dates. At MP4, there were exceedances
of limit level for turbidity and SS on 20 May 2010. At MP5, pH, turbidity and
SS were exceeded on 12 and 20 May 2010 (action level for pH, limit levels for turbidity
and SS). There were frequent action and limit level exceedances of pH at MP6
during the monitoring period and exceedances of limit levels of turbidity and
SS on 12 and 14 May 2010. For MP4, MP5, MP6, the DO were exceeded on most of
the monitoring dates.
The Event and Action Plan in Appendix D was followed under these cases of exceedances.
From investigation, 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.
Moreover, re-profiling earthworks
were observed at the adjacent fish ponds by the fish pond owner so the
exceedances at MP3 were considered invalid. The exceedance of SS and turbidity
at MP4 and MP5 on 20 May 2010 were considered not due to construction works as
the location of MP6, which is close to the discharge outlet at the east of
construction site, both SS and turbidity level are less than MP4 and MP5
(Turbidity and SS level at MP6 are 62.8 NTU and 53 mg/L respectively). Moreover,
as noted by monitoring team during on-site sampling, no direct muddy water
discharge was observed from the site. The exceedances were considered not due
to construction works. However, possible source of discharge which may give
rise to the exceedance was unknown. Subsequent water quality monitoring results
carried out from 22 May 2010 onward indicated that no exceedance for SS and
turbidity for MP4, MP5 and MP6 except DO / pH.
DO and pH exceedance may be due to the
natural variation, as the temperature was higher when compared with baseline
monitoring period. The exceedances were considered not due to construction
works.
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. As wet weather is coming, to
cater for the increase of site runoff, the Contractor would further enhance 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.
Construction phase ecological
monitoring commenced on 12 May 2010. This report documents surveys conducted in
the Survey Area between 12 May and 31 May 2010. Survey Area is provided in Figure 4.1. Dates and ecological surveys conducted during this period are given in
Appendix H.
Monitoring was undertaken following
the survey methodology in the EM&A Manual. 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 21 bird species of conservation importance and/or
wetland-dependence were recorded using the ponds within 500 m of the Project
Site. A summary of survey data is provided in Appendix I.
Species and numbers recorded in this
survey period are typical of fish pond area in May, as the migratory season for
most species has passed. Survey findings indicate that the fish ponds within
the Survey Area continue to attract species that are typical of the area in
early summer months and are not adversely affected by the construction.
One day time and one night time
herpetofauna survey were conducted in the survey period. Only one amphibian
species (Günther’s Frog) was recorded in this month. This is a very common and
widespread species in northwestern Hong Kong.
There were no other notable sightings. A summary of the survey findings are
provided in Appendix J.
Monitoring of dragonfly and
butterfly was conducted on a bi-monthly basis. A total of 13 dragonfly species
and 6 butterfly species were recorded. All observations were of common and
widespread species recorded in low to very low numbers. A summary of the survey
findings are provided in Appendix J.
Monitoring of mammal was conducted
concurrently with other surveys. No mammals were recorded in the survey period.
Ecological monitoring were carried
out following the survey methodology and frequency outlined in the EM&A
Manual (March 2008) in May 2010.
A total of 21 bird species, 1
amphibian species, 13 dragonfly species and 6 butterfly species were recorded.
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 the fish pond areas in the early summer
months.
The EM&A programme for Landscape and
Visual impact due to the construction commenced in May 2010. Site inspection was
carried out on 26 May 2010 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
works area was confined by site hoardings and noise barriers at the site
boundaries. No works exceeded the site boundaries was observed.
|
|
Protection of all trees and
woodland blocks to be retained
|
An area
of reedbed was preserved and confined with fencing on site as nursery for the
replanting to future wetland restoration area. Trees retained and
transplanted were fenced off by site hoardings and noise barriers.
|
|
Streams
|
Mitigation
measures including sand bags and aqua sed were provided to avoid site run-off
and treatment of discharge.
|
|
Clearance of existing vegetation
|
Site
clearance was completed prior to the commencement of construction. An area of
reedbed was preserved and confined with fencing on site.
|
|
Transplanting of trees
|
Trees
transplanting was completed with strip planting along the southern site
boundary.
|
|
Topsoil stripping
|
Topsoils
to be reused on site were stockpiled on site with taupaulin sheet covered or
compacted and keep moist to minimize dust generation.
|
|
New buildings
|
Not
relevant
|
|
Boundaries
|
Hoardings
were erected as required
|
|
Noise Barrier
|
Noise
barriers design accords with the mitigation proposals with upper 7 or 6 m
portion in translucent material with green tinted to match with the
environment. All noise barriers were constructed at locations according to
the mitigation proposals.
|
|
Night-time lighting
|
No
night-time works were carried out during the monitoring period.
|
|
Plant supply
|
The
advance strip plantings were supplied by landscape contractor and the
planting period is in appropriate season to facilitate the establishment of
the plants.
|
|
Landscape and wetland treatments
generally
|
The
wetland restoration area is under construction.
|
|
Soiling, planting, etc.
|
The
strip planting with compensatory and transplanted trees has not been hand
over for maintenance, the planting works are under supervision on-site to
ensure meeting the requirement in the approved planting proposal.
|
|
Establishment Works
|
The
strip planting has not been hand over. Monitoring will be carried out in next
phase.
|
6.
Environmental
Site Inspection and Audit
|
The ET had carried out pre-construction
phase weekly site inspections on 12, 20
and 26 May 2010. 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)
|
|
Water ponding in the site
|
To clear stagnant water regularly
|
Agreed and on-going
|
-
|
|
Un-used drainage channel
|
To backfill the channel
|
Agreed and action taken
|
26 May 2010
|
|
Mud track on the haul road
|
To clear the mud track and avoid
site vehicles from using the haul road
|
Agreed and action taken
|
20 May 2010
|
|
Muddy water inside wheel wash
facility
|
To clean the water for improving
the washing efficiency
|
Agreed and action taken
|
3 Jun 2010
|
|
Discharge point under modification
|
To reinstate the rock filter and
avoid runoff from direct discharge
|
Agreed and action taken
|
3 Jun 2010
|
|
Stockpiles in the site
|
To provide appropriate covering
(e.g. tarpaulin sheet)
|
Agreed and action taken
|
3 Jun 2010
|
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 and disposed off at Public Fill
Reception Facilities at Tuen Mun Area 38 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. 4.2 tonnes of other types of wastes (e.g. general
refuse) was generated on site and disposed of at North East New Territories (NENT)
Landfill.
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-311/2008A
|
Valid
|
|
APCO
|
Notification of Construction Work under
APCO
|
316688
(27 Apr
2010)
|
Valid
|
|
WPCO
|
Discharge License
|
(Application
no.: 313815)
|
Under
Application
(Submitted
on 22 Jan 2010)
|
|
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
6.4
Recommended Mitigation Measures
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;
·
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;
·
Silt and debris should be removed from the temporary
drainage channel regularly; and
·
Any soil contaminated with chemicals/oils shall be
removed from site and the void created shall be filled with suitable materials.
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
·
Ventilation
should be provided for the Chemical Store Room.
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 MP2, MP3, MP4, MP5
and MP6 on different monitoring dates.
Exceedances of pH, DO, turbidity and SS were
observed. For MP2, there was exceedance of action level for SS on 20 May 2010.
For MP3, there were exceedances of pH, DO, turbidity and SS (action and limit
levels) on different monitoring dates. At MP4, there were exceedances of limit
level for turbidity and SS on 20 May 2010. At MP5, pH, turbidity and SS were
exceeded on 12 and 20 May 2010 (action level for pH, limit levels for turbidity
and SS). There were frequent action and limit level exceedances of pH at MP6
during the monitoring period and exceedances of limit levels of turbidity and
SS on 12 and 14 May 2010. For MP4, MP5, MP6, the DO were exceeded on most of
the monitoring dates. Table 7.1
provides summary of exceedance of Action and Limit Levels for water quality in
the reporting month.
Table
7.1: Summary of exceedances in Water Quality
|
Monitoring Date
|
pH
|
Dissolved Oxygen (mg/L)
|
Turbidity (NT)
|
Suspended Solids (mg/L)
|
|
MP2
|
|
|
|
|
|
20/5/2010
|
7.5
|
4.1
|
106.5
|
180.0
|
|
Action Level
|
<5.5 or
>7.5
|
<1.04
|
>132
|
>170
|
|
Limit Level
|
<4.0 or
>8.0
|
<0.89
|
>163
|
>209
|
|
|
|
|
|
|
|
MP3
|
|
|
|
|
|
12/5/2010
|
9.0
|
11.1
|
123.5
|
125.5
|
|
14/5/2010
|
7.8
|
6.3
|
136.5
|
135.5
|
|
18/5/2010
|
8.3
|
10.0
|
70.7
|
79.0
|
|
20/5/2010
|
8.5
|
10.0
|
148.0
|
180.0
|
|
22/5/2010
|
7.4
|
4.5
|
74.9
|
73.0
|
|
24/5/2010
|
7.6
|
4.9
|
120.5
|
115.0
|
|
26/5/2010
|
8.0
|
8.2
|
108.5
|
103.5
|
|
28/5/2010
|
7.8
|
4.8
|
59.2
|
67.0
|
|
31/5/2010
|
8.1
|
7.2
|
60.9
|
71.0
|
|
Action Level
|
<5.5 or
>7.5
|
<6.85
|
>64
|
>65
|
|
Limit Level
|
<4.0 or
>8.0
|
<6.65
|
>67
|
>66
|
|
|
|
|
|
|
|
MP4
|
|
|
|
|
|
18/5/2010
|
7.0
|
0.8
|
45.4
|
30.5
|
|
20/5/2010
|
7.3
|
1.2
|
72.9
|
78.0
|
|
22/5/2010
|
7.0
|
0.8
|
27.5
|
23.0
|
|
24/5/2010
|
7.0
|
1.1
|
29.4
|
21.5
|
|
26/5/2010
|
7.0
|
0.9
|
40.4
|
19.0
|
|
28/5/2010
|
7.1
|
1.3
|
28.6
|
31.0
|
|
31/5/2010
|
7.1
|
1.2
|
22.3
|
25.5
|
|
Action Level
|
<5.5 or
>7.5
|
<3.91
|
>60
|
>50
|
|
Limit Level
|
<4.0 or
>8.0
|
<3.82
|
>64
|
>53
|
|
|
|
|
|
|
|
MP5
|
|
|
|
|
|
12/5/2010
|
7.7
|
3.7
|
101.6
|
74.5
|
|
14/5/2010
|
7.4
|
2.4
|
53.0
|
37.0
|
|
18/5/2010
|
7.4
|
2.7
|
34.8
|
18.5
|
|
20/5/2010
|
7.6
|
1.8
|
111.5
|
83.5
|
|
22/5/2010
|
7.2
|
1.4
|
48.9
|
48.5
|
|
24/5/2010
|
7.2
|
1.2
|
27.9
|
18.5
|
|
26/5/2010
|
7.3
|
2.8
|
39.7
|
33.0
|
|
28/5/2010
|
7.4
|
3.3
|
33.6
|
30.0
|
|
31/5/2010
|
7.3
|
2.0
|
48.4
|
43.5
|
|
Action Level
|
<5.5 or
>7.5
|
<4.13
|
>81
|
>66
|
|
Limit Level
|
<4.0 or
>8.0
|
<3.87
|
>84
|
>69
|
|
|
|
|
|
|
|
MP6
|
|
|
|
|
|
12/5/2010
|
7.9
|
2.8
|
232.0
|
224.5
|
|
14/5/2010
|
7.6
|
1.0
|
123.0
|
84.5
|
|
18/5/2010
|
8.1
|
4.4
|
61.9
|
49.5
|
|
20/5/2010
|
7.8
|
3.7
|
62.8
|
52.0
|
|
22/5/2010
|
7.9
|
1.7
|
31.2
|
19.5
|
|
24/5/2010
|
7.6
|
1.4
|
24.2
|
13.0
|
|
26/5/2010
|
7.5
|
2.0
|
32.8
|
22.0
|
|
28/5/2010
|
7.7
|
3.1
|
41.4
|
38.5
|
|
31/5/2010
|
7.6
|
1.7
|
86.4
|
72.0
|
|
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 this month.
No notifications of
summons or successful prosecution were received this month.
Investigations have been carried out to identify
the causes of exceedance. The investigation reports for the exceedances
happened during the reporting period have been sent to the IEC for review.
Currently the investigation report for exceedances from 20 to 31 May 2010 is
under review and revision.
From investigation, construction activities
during the period of exceedance included mainly site clearance, site formation,
and drainage work. 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 the re-profiling works carried out at the fish ponds and
natural variations, 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.
As wet weather is coming, to cater for the
increase of site runoff, the Contractor would further enhance 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.
The major site works to be commissioned in the coming month
include:
¡
Site formation and drainage work for Wetland
Restoration Area (WRA);
¡
Installation of Band Drain; and
¡
Trial Embankment for Ground Improvement
Key issues to be considered in the coming month include:
¡
Generation
of dust from activities on-site (esp. for Trial Embankment);
¡
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.
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 June 2010 is shown in the Table 8.1.
Table 8.1: Tentative
Environmental Monitoring and Audit Schedule for June 2010
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.
Action and Limit Level exceedances of pH, DO, turbidity and SS were
recorded at water quality monitoring stations including MP2, MP3, MP4, MP5 and
MP6. 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
the re-profiling works in the fish ponds and natural variations.
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; 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;
·
Silt and debris should be removed from the temporary
drainage channel regularly; and
·
Any soil contaminated with chemicals/oils shall be
removed from site and the void created shall be filled with suitable materials.
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;
·
Ventilation
should be provided for the Chemical Store Room.
+852 2827 1823
