


Content
Chapter Title Page
List of Figures
Figure 1.1 General Layout Plan of the Project
Site
Figure 2.1 Locations of Air Quality Monitoring
Stations
Figure 2.2 Locations of Noise Monitoring
Stations
Figure 2.3 Locations of Water Quality
Monitoring Stations
Figure 4.1 Survey Area and Transect Walked
List of Appendices
Appendix A Project
Organization Chart
Appendix B Tentative
Construction Programme
Appendix C Action and Limit
Levels for Construction Phase
Appendix D Event and Action
Plan for Air Quality, Noise and Water Quality
Appendix E Calibration
certificates
Appendix F Graphical plots
of the monitoring results
Appendix G Weather
conditions during the monitoring period
Appendix H Ecological
Monitoring conducted
Appendix I Summary of Bird
Surveys conducted
Appendix J Summary of Herpetofauna,
Mammal and Insect Surveys conducted
Appendix K Summary of Monitoring of Water
Quality associated with Ecological Monitoring conducted
Appendix L Environmental Mitigation Measures - Implementation Status
Executive Summary
Mott
MacDonald Hong Kong Ltd. (“MMHK”) has been commissioned by Heng
Shung Construction Co. Ltd. (The Contractor) 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.
This
is the 39th EM&A report submitted under the Condition 4.5 of
Environmental Permit No. EP-311/2008/D. This report
summarises the findings on EM&A during the period from 1 to 31 July 2013.
Exceedance of Action and Limit
Levels
There
was no breach of Action or Limit levels for Air Quality (1-hr TSP and 24-hr
TSP) and Noise level (as Leq) in the
reporting month.
During July 2013,
Action Level exceedance of pH was observed at MP3,
MP5 and MP6, while exceedances of DO, turbidity
and/or SS were observed at MP3 to MP5 but not observed at MP6. DO exceedance was observed 12 times at MP3 and once at MP4. SS
and/or turbidity exceedance was recorded on four
monitoring dates at MP4 and one monitoring date at MP5 during the reporting
month.
The
summary of measured water quality is presented in Section 3.2.3.
Investigations have been carried out
to identify the causes of exceedance. From
investigation, the Contractor has implemented water quality mitigation measures
as recommended in the EIA report. With external factors affecting the adjacent
environments, such as natural variations, pond fish culture activities,
rainfall and suspected routine dredging works (unrelated to the Project), the exceedances were considered not due to the project construction
works.
Implementation of
mitigation measures
Site audits were carried out on 2, 9, 19, 23 and 29 July 2013 to
confirm the implementation measures undertaken by the Contractor in the
reporting month. The outcomes are presented in Section 6 and the status of implementation of mitigation measures
in the site is shown in Appendix L.
Record of Complaints
There
was no record of complaints received in the reporting month.
Record of
Notification of summons and successful prosecution
There
was no record of Notification of summons and successful prosecution in the
reporting month.
Reporting Changes
There
was no reporting change in the reporting month.
Future Key Issues
The
major site works scheduled to be commissioned in the coming three months
include site
formation, foundation work, superstructure and pond drainage management in the
Wetland Restoration Area (to lower the water level and remove unwanted species
in the pond). Potential environmental impacts due to the construction
activities, including air quality, noise, water quality, ecology and landscape and
visual, will be monitored.
Environmental mitigation measures will be
implemented on site as recommended and weekly site audits will be carried out
to ensure that the environmental conditions are acceptable.
In March 2005, the Project Proponent, Profit Point Enterprises Limited, acquired the development site at Wo Shang Wai in Yuen Long. An Environmental Impact Assessment (EIA) was then carried out and approved under the EIA Ordinance (EIAO), and the Environmental Permit (EP-311/2008) for construction of the comprehensive development in Wo Shang Wai was first granted by EPD on 9 September 2008 and has been subsequently varied, with the current version (EP-311/2008/D) issued by EPD on 20 March 2013.
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. The site formation construction works of the Wetland Restoration Area (hereafter WRA) were completed on 15
November 2010, while the 30-month establishment period of the WRA was concluded
in August 2012 – this indicated that planting works as scheduled in the
approved Wetland Restoration and Creation Scheme (WRCS; Nov 2009) was complete,
except along the western and southern boundary where the planting is affected
by the existing site boundary and noise barrier, and for which a Variation to
Environmental Permit (EP-311/2008/C) to defer planting at the location was
approved. The current valid EP (EP-311/2008/D) includes specific mitigation
measures to minimise certain identified noise impacts during the operation
phase.
Mott MacDonald Hong Kong Ltd. (“MMHK”) has been commissioned by the Contractor, 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 two weeks after the end of the reporting month. This report summarises the findings during the period from 1 to 31 July 2013.
The organization
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 included:
¡ Site formation
¡ Foundation Work
¡ Pond drainage management in the Wetland
Restoration Area (to lower the water level and remove unwanted species in the
pond)
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 Monitoring 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 Nov, 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 Wetland Restoration Area (WRA) |
Wetland Restoration Area |
After filling of WRA with water, monthly for in situ water quality and every six 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 July 2013

2.
Impact Monitoring Methodology
|
For air
quality, construction noise and water quality, ecology,
landscape and visual monitoring methodology, including the monitoring
locations, monitoring equipment 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
|
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 |
The
four 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 Dust
Trak 8520 & 8532 |
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 two metres separation from walls, parapets and penthouse was required for rooftop sampler.
· A minimum of two metres 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 two-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.
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 |
The
four 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 |
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
Stations |
Equipment
Model |
|
|
Integrating
Sound Level Meter |
Calibrator |
|
|
NSR1 |
Rion NL-52 |
Rion NC-73 |
|
NSR3 |
||
|
NSR5 |
||
|
NSR7 |
||
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 07:00 and 19:00)
· 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.
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, three 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 |
The
six 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 |
The Water Quality Monitoring Equipment 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 equipment
|
Equipment |
Model |
Equipment/Serial Number |
|
Conductivity, Dissolved oxygen, pH, Salinity and Temperature Measuring
Meter |
YSI Professional Plus |
09K100735 |
|
Turbidity Meter |
Hach 2100Q |
12010C015757 |
|
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 Professional Plus) 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 2100Q) 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 |
In situ measurement
All pH meters, DO/temperature meters had been
checked and calibrated prior to use. Standard buffer solution of at least two 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 three-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 three 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.
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 Wetland Restoration Area (WRA)
|
Species
/ Parameter |
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. |
Ecological
monitoring locations during
construction phase are shown in Figure 4.1 and the methodology for ecological monitoring
is detailed in Section 4.
·
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 |
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 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. Minimum 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 2, 9, 19, 23 and 29 July
2013 in the reporting month to assess the
compliance with environmental requirements.
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. The weather conditions in the reporting period are provided in Appendix G.
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 |
||||||||
|
02-Jul-13 |
13:27 |
102 |
94 |
83 |
82 - 113 |
378 |
500 |
|
|
05-Jul-13 |
14:08 |
82 |
90 |
104 |
||||
|
11-Jul-13 |
13:20 |
86 |
105 |
93 |
||||
|
17-Jul-13 |
13:36 |
104 |
84 |
113 |
||||
|
23-Jul-13 |
13:31 |
86 |
112 |
97 |
||||
|
29-Jul-13 |
13:17 |
86 |
93 |
104 |
||||
|
ASR2A |
||||||||
|
02-Jul-13 |
12:52 |
86 |
94 |
100 |
86
- 114 |
357 |
500 |
|
|
05-Jul-13 |
12:49 |
90 |
86 |
102 |
||||
|
11-Jul-13 |
12:46 |
114 |
96 |
102 |
||||
|
17-Jul-13 |
12:56 |
89 |
102 |
111 |
||||
|
23-Jul-13 |
12:52 |
104 |
93 |
111 |
||||
|
29-Jul-13 |
12:48 |
104 |
112 |
96 |
||||
|
ASR3 |
||||||||
|
02-Jul-13 |
12:36 |
90 |
106 |
82 |
82
- 114 |
358 |
500 |
|
|
05-Jul-13 |
12:35 |
89 |
102 |
93 |
||||
|
11-Jul-13 |
12:33 |
104 |
112 |
93 |
||||
|
17-Jul-13 |
12:39 |
105 |
98 |
114 |
||||
|
23-Jul-13 |
12:37 |
86 |
102 |
93 |
||||
|
29-Jul-13 |
12:31 |
86 |
104 |
93 |
||||
|
ASR4 |
||||||||
|
02-Jul-13 |
13:20 |
89 |
112 |
120 |
89
- 122 |
372 |
500 |
|
|
05-Jul-13 |
13:49 |
112 |
106 |
98 |
||||
|
11-Jul-13 |
13:12 |
113 |
122 |
105 |
||||
|
17-Jul-13 |
13:25 |
93 |
116 |
104 |
||||
|
23-Jul-13 |
13:24 |
109 |
122 |
97 |
||||
|
29-Jul-13 |
13:09 |
86 |
112 |
122 |
||||
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. The weather conditions in the reporting period are provided in Appendix G.
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 |
|
|
|
|
|
02-Jul-13 |
78 |
78
- 85 |
226 |
260 |
|
05-Jul-13 |
81 |
|||
|
11-Jul-13 |
82 |
|||
|
17-Jul-13 |
85 |
|||
|
23-Jul-13 |
80 |
|||
|
29-Jul-13 |
79 |
|||
|
ASR2A |
|
|
|
|
|
02-Jul-13 |
79 |
78
- 90 |
213 |
260 |
|
05-Jul-13 |
90 |
|||
|
11-Jul-13 |
87 |
|||
|
17-Jul-13 |
81 |
|||
|
23-Jul-13 |
78 |
|||
|
29-Jul-13 |
89 |
|||
|
ASR3 |
|
|
|
|
|
02-Jul-13 |
80 |
80
- 99 |
205 |
260 |
|
05-Jul-13 |
99 |
|||
|
11-Jul-13 |
85 |
|||
|
17-Jul-13 |
81 |
|||
|
23-Jul-13 |
80 |
|||
|
29-Jul-13 |
86 |
|||
|
ASR4 |
|
|
|
|
|
02-Jul-13 |
83 |
81
- 94 |
237 |
260 |
|
05-Jul-13 |
86 |
|||
|
11-Jul-13 |
94 |
|||
|
17-Jul-13 |
84 |
|||
|
23-Jul-13 |
81 |
|||
|
29-Jul-13 |
86 |
No exceedance of 1-hour and 24-hour TSP (Action or Limit Level) was recorded in the reporting period.
The construction noise monitoring results are summarized in Table 3.3. Graphical plots of the monitoring data are shown in Appendix F. The weather conditions in the reporting period are provided in Appendix G.
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 |
|
02-Jul-13 |
15:10 |
57 |
59 |
55 |
|
|
11-Jul-13 |
14:56 |
55 |
58 |
51 |
|
|
17-Jul-13 |
15:11 |
56 |
59 |
51 |
|
|
23-Jul-13 |
15:49 |
56 |
58 |
53 |
|
|
29-Jul-13 |
14:45 |
55 |
57 |
52 |
|
|
NSR3 |
|
|
|
|
|
|
02-Jul-13 |
15:50 |
57 |
59 |
55 |
|
|
11-Jul-13 |
15:37 |
57 |
60 |
50 |
|
|
17-Jul-13 |
15:54 |
55 |
58 |
45 |
|
|
23-Jul-13 |
16:29 |
57 |
59 |
51 |
|
|
29-Jul-13 |
15:28 |
57 |
58 |
51 |
|
|
NSR5 |
|
|
|
|
|
|
02-Jul-13 |
13:32 |
59 |
61 |
54 |
|
|
11-Jul-13 |
13:23 |
59 |
63 |
57 |
|
|
17-Jul-13 |
13:41 |
57 |
60 |
54 |
|
|
23-Jul-13 |
13:35 |
57 |
61 |
54 |
|
|
29-Jul-13 |
13:22 |
59 |
62 |
56 |
|
|
NSR7 |
|
|
|
|
|
|
02-Jul-13 |
14:22 |
65 |
68 |
59 |
|
|
11-Jul-13 |
14:09 |
63 |
67 |
58 |
|
|
17-Jul-13 |
14:20 |
63 |
66 |
60 |
|
|
23-Jul-13 |
14:31 |
65 |
68 |
62 |
|
|
29-Jul-13 |
14:02 |
63 |
66 |
61 |
|
No exceedance (Action/Limit Level) of construction noise was recorded in the reporting period.
The water quality monitoring results are summarized in Table 3.4. Graphical plots of the monitoring data are shown in Appendix F. The weather conditions in the reporting period are provided in Appendix G.
Table 3.4: Summary of Water Quality Monitoring Results
|
Monitoring Date |
Temp (oC) |
pH |
Dissolved Oxygen (DO) (mg/L) |
DO (%) |
Turbidity
(NT) |
BOD
(mg/L) (1) |
Suspended
Solids (mg/L) |
|
MP3 |
|
|
|
|
|
|
|
|
02/07/2013 |
30.0 |
7.3 |
5.4 |
72.3 |
33.4 |
5 |
24 |
|
04/07/2013 |
32.3 |
7.6 |
4.3 |
59.9 |
40.2 |
4 |
37 |
|
06/07/2013 |
31.7 |
7.5 |
4.1 |
55.4 |
19.2 |
5 |
15 |
|
08/07/2013 |
32.3 |
7.4 |
5.0 |
68.9 |
25.3 |
5 |
23 |
|
10/07/2013 |
31.0 |
7.4 |
5.3 |
71.8 |
35.9 |
8 |
36.5 |
|
12/07/2013 |
32.1 |
7.3 |
5.1 |
67.8 |
38.4 |
6 |
37.5 |
|
15/07/2013 |
31.1 |
7.3 |
4.1 |
55.0 |
57.2 |
7 |
33.5 |
|
17/07/2013 |
29.6 |
7.3 |
5.3 |
69.5 |
18.0 |
5 |
15 |
|
19/07/2013 |
30.1 |
7.3 |
7.0 |
93.1 |
38.0 |
8 |
29 |
|
22/07/2013 |
29.8 |
7.3 |
4.1 |
54.4 |
36.0 |
9 |
31 |
|
24/07/2013 |
29.2 |
7.3 |
3.7 |
48.4 |
31.1 |
6 |
26.5 |
|
26/07/2013 |
28.0 |
7.3 |
3.9 |
50.3 |
25.5 |
5 |
24.5 |
|
29/07/2013 |
31.7 |
7.6 |
7.5 |
102.4 |
19.1 |
5.5 |
14 |
|
31/07/2013 |
31.6 |
7.6 |
4.3 |
58.6 |
39.1 |
7 |
34.5 |
|
Action Level |
- |
<5.5 or >7.5 |
<6.85 |
- |
>64 |
- |
>65 |
|
Limit
Level |
- |
<4.0 or >8.0 |
<6.65 |
- |
>67 |
- |
>66 |
|
|
|
|
|
|
|
|
|
|
MP4 |
|
|
|
|
|
|
|
|
02/07/2013 |
29.0 |
7.4 |
4.3 |
55.4 |
41.9 |
8 |
20.5 |
|
04/07/2013 |
32.3 |
7.5 |
4.9 |
67.6 |
18.0 |
3.5 |
21 |
|
06/07/2013 |
31.1 |
7.5 |
5.7 |
76.2 |
17.7 |
4.5 |
19 |
|
08/07/2013 |
32.6 |
7.5 |
4.8 |
66.7 |
26.7 |
5.5 |
23.5 |
|
10/07/2013 |
29.9 |
7.5 |
6.2 |
82.2 |
54.6 |
4 |
56 |
|
12/07/2013 |
30.5 |
7.5 |
6.1 |
83.0 |
32.4 |
5.5 |
38 |
|
15/07/2013 |
29.9 |
7.5 |
6.4 |
85.1 |
59.1 |
9 |
67 |
|
17/07/2013 |
29.1 |
7.5 |
6.3 |
81.7 |
46.1 |
5 |
33.5 |
|
19/07/2013 |
29.7 |
7.4 |
4.8 |
63.3 |
60.7 |
7 |
54 |
|
22/07/2013 |
29.3 |
7.5 |
4.2 |
56.0 |
51.1 |
4 |
43 |
|
24/07/2013 |
27.9 |
7.5 |
4.2 |
54.0 |
43.1 |
5 |
43.5 |
|
26/07/2013 |
26.7 |
7.5 |
3.9 |
48.9 |
59.4 |
3 |
47.5 |
|
29/07/2013 |
31.6 |
7.5 |
4.4 |
59.6 |
25.0 |
2 |
20.5 |
|
31/07/2013 |
31.5 |
7.5 |
5.4 |
74.0 |
60.8 |
4 |
50 |
|
Action Level |
- |
<5.5 or >7.5 |
<3.91 |
- |
>60 |
- |
>50 |
|
Limit
Level |
- |
<4.0 or >8.0 |
<3.82 |
- |
>64 |
- |
>53 |
|
|
|
|
|
|
|
|
|
|
MP5 |
|
|
|
|
|
|
|
|
02/07/2013 |
28.4 |
7.4 |
5.7 |
73.8 |
27.6 |
3 |
28.5 |
|
04/07/2013 |
32.4 |
7.4 |
7.8 |
108.3 |
21.3 |
2 |
28.5 |
|
06/07/2013 |
31.0 |
7.5 |
7.7 |
103.8 |
30.6 |
3 |
30 |
|
08/07/2013 |
32.8 |
7.5 |
10.5 |
146.9 |
26.4 |
6 |
36.5 |
|
10/07/2013 |
29.4 |
7.5 |
6.8 |
89.9 |
28.8 |
4.5 |
32 |
|
12/07/2013 |
30.7 |
7.6 |
6.9 |
93.0 |
26.5 |
7 |
34.5 |
|
15/07/2013 |
30.0 |
7.6 |
9.7 |
129.6 |
30.7 |
11.5 |
74.5 |
|
17/07/2013 |
29.0 |
7.6 |
7.2 |
95.5 |
53.3 |
7 |
52 |
|
19/07/2013 |
30.8 |
7.5 |
7.7 |
103.8 |
33.2 |
7.5 |
30 |
|
22/07/2013 |
29.0 |
7.6 |
5.3 |
68.5 |
33.9 |
3 |
27.5 |
|
24/07/2013 |
27.3 |
7.5 |
4.3 |
54.3 |
28.1 |
5 |
26 |
|
26/07/2013 |
28.0 |
7.6 |
6.1 |
76.6 |
80.2 |
3 |
51.5 |
|
29/07/2013 |
31.8 |
7.6 |
4.7 |
65.0 |
41.1 |
4.5 |
38.5 |
|
31/07/2013 |
31.1 |
7.6 |
7.1 |
96.4 |
59.3 |
4 |
54 |
|
Action Level |
- |
<5.5 or >7.5 |
<4.13 |
- |
>81 |
- |
>66 |
|
Limit
Level |
- |
<4.0 or >8.0 |
<3.87 |
- |
>84 |
- |
>69 |
|
|
|
|
|
|
|
|
|
|
MP6 |
|
|
|
|
|
|
|
|
02/07/2013 |
27.9 |
7.5 |
6.0 |
76.9 |
31.1 |
3 |
31 |
|
04/07/2013 |
31.3 |
7.4 |
7.7 |
105.3 |
32.6 |
2.5 |
46 |
|
06/07/2013 |
29.4 |
7.5 |
6.9 |
91.2 |
16.7 |
2.5 |
22.5 |
|
08/07/2013 |
32.3 |
7.5 |
10.6 |
146.6 |
20.0 |
6 |
19.5 |
|
10/07/2013 |
29.2 |
7.5 |
8.7 |
114.6 |
27.1 |
6 |
40 |
|
12/07/2013 |
30.4 |
7.6 |
8.6 |
111.1 |
23.9 |
4.5 |
32.5 |
|
15/07/2013 |
29.3 |
7.6 |
9.4 |
123.1 |
49.0 |
11.5 |
57 |
|
17/07/2013 |
28.6 |
7.6 |
6.2 |
80.2 |
62.5 |
4 |
65.5 |
|
19/07/2013 |
30.5 |
7.5 |
7.0 |
93.3 |
40.7 |
4.5 |
31 |
|
22/07/2013 |
28.4 |
7.6 |
5.6 |
72.2 |
31.9 |
5.5 |
22.5 |
|
24/07/2013 |
27.0 |
7.6 |
5.8 |
73.0 |
51.0 |
4.5 |
57.5 |
|
26/07/2013 |
26.7 |
7.6 |
6.1 |
76.2 |
86.9 |
3.5 |
74 |
|
29/07/2013 |
30.5 |
7.6 |
6.0 |
78.6 |
42.1 |
3 |
40.5 |
|
31/07/2013 |
31.0 |
7.6 |
6.7 |
90.2 |
43.5 |
3.5 |
40.5 |
|
Action Level |
- |
<5.5 or >7.5 |
<4.61 |
- |
>94 |
- |
>75 |
|
Limit
Level |
- |
<4.0 or >8.0 |
<4.52 |
- |
>96 |
- |
>75 |
Notes:
(1)
“<2 “ : BOD
value is too low to indicate (<2mg/L).
(2)
Values Bold
indicate Action Level exceedance.
(3)
Values Underlined
and Bold indicate Limit Level exceedance.
Exceedance Investigation and Findings
During July 2013,
Action Level exceedance of pH was observed at MP3,
MP5 and MP6, while exceedances of DO, turbidity
and/or SS were observed at MP3 to MP5 but not observed at MP6. DO exceedance was observed 12 times at MP3 and once at MP4. SS
and/or turbidity exceedance was recorded on four
monitoring dates at MP4 and one monitoring date at MP5 during the reporting
month.
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 site
formation and foundation work, as well as pond drainage management in the
Wetland Restoration Area (to lower the water level and remove unwanted species
in the pond). 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 and installing a barrier at
the discharge outlet to desilt and divert site runoff
to sedimentation tanks and wastewater treatment facilities (Aquased),
which will ensure all site runoff is treated to
satisfactory quality before discharging into the northern ditches.
Exceedances of pH and DO at MP3
During the reporting month at MP3, exceedance of the Action Level of pH was observed three
times, while Action/Limit Level exceedance of DO was
recorded on 12 monitoring dates at MP3. Also, Action/Limit Level exceedance of turbidity and/or SS was not observed. As
understood, the fish pond near the site (represented by 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. The exceedances of DO may be
due to external factors such as pond fish culture activities which were out of
the control of the project.
Exceedances of pH, DO, turbidity and SS at MP4 to MP6
During the reporting month, exceedance
of the Action/Limit Level of pH was observed at MP5 and MP6 but not observed at
MP4. Meanwhile, Action/Limit Level of DO was exceeded once at MP4, but not
exceeded at MP5 and MP6. Action/Limit Level exceedance
of turbidity was observed on at MP4 on 19 and 31 July 2013, but not observed at
MP5 and MP6. Action/Limit Level exceedance of SS was
observed at MP4 on 10, 15 and 19 July 2013 and at MP5 on 15 July 2013, but not
observed at MP6.
From Hong Kong Observatory (HKO) records, total
rainfall recorded at HKO during the reporting month was 436.3 mm, which was
above the 1981-2010 climatological normal for the same month of 376.5 mm. The
heaviest rain fell on 25 and 26 July 2013 when 57.7 and 65.4 mm of rain were
recorded respectively at HKO. In addition, between 20 and 45 mm of rain per day
was recorded on 1, 7, 14, 15, 17, 19 and 24 July 2013. More generally, at least
a trace of rainfall was recorded by HKO on 25 of the 31 days during the
reporting month, including all relevant days of turbidity and/or SS exceedance. Amber Rainstorm Warning signal was issued on 7,
14, 15 and 26 July 2013, but no Special Announcement on Flooding in the
northern New Territories was issued during the reporting month. Tropical
cyclone warning signal was issued on four days during the reporting month.
Strong Monsoon Signal was issued on one day.
The heavy and/or persistent rainfall may have caused a
large amount of surface runoff from all sources in the vicinity of the open
ditch. It is believed that the runoff significantly increased the turbulence
and thus resulted in higher turbidity and/or SS inside the ditch water on the
days of turbidity and/or SS exceedance. The higher SS
induced by the heavy and/or persistent rain may also have resulted in a
decrease in DO on some monitoring days.
Also, the site effluent was
effectively treated by the AquaSed system and
discharged from the site at a low, controlled rate during the reporting month.
Furthermore, it is noted that no DO, turbidity or SS exceedance
was observed at MP6 (the closest monitoring location to the site discharge
point) during the reporting month, and that all pH exceedances
recorded at that location were marginally above the Action Level.
Conclusion
As a result, the abovementioned exceedances are unlikely to be due to the construction
works and therefore not considered to be related to the project.
This report documents surveys
conducted in the Survey Area between 1 and 31 July 2013. The Wetland Restoration Area (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. A transect was followed in the
bird surveys (see Figure 4.1). All bird species were identified to species and all bird species of
conservation importance and/or wetland dependent were enumerated and recorded
to the habitats in which they were observed. Flying birds were not recorded
unless they were foraging and/or associated with the habitat (such as swifts).
Further, notable bird observations during other surveys were also recorded.
A total of 25 bird species were
recorded in the Survey Area (excluding the WRA), 11 of which were species of
conservation importance and/or wetland-dependence. Within the WRA, 19 bird
species were recorded, 11 of which were species of conservation importance
and/or wetland-dependent species, including two of the target species (i.e.
Little Egret, Chinese Pond Heron) were recorded. The WRA continues to attract a
number of species of conservation importance, including Yellow Bittern, Ixobrychus sinensis.
This species is listed by Fellowes et al. as of “Local Concern” in 2002. A summary of survey data is provided in Appendix I.
One night time herpetofauna
survey was conducted in the reporting month. No herpetofauna
were recorded in the
Survey Area (excluding the WRA). One Asian Common Toad was recorded within the
WRA. A summary of the survey findings is provided in Appendix J.
Monitoring
of dragonflies and butterflies were conducted on a bi-weekly basis according to
the EM&A Manual. A total of six odonata species
were recorded in the Survey Area (excluding the WRA) while four butterfly
species were recorded. Within the WRA, a total of ten odonata
species were recorded, while three butterfly species were recorded.. A summary of the survey findings is provided in Appendix J.
Monitoring of
mammals was conducted concurrently with other surveys. No mammals were recorded
in the WRA during regular survey. In additional night search, 20 Pipistrelles, Pipistrellus sp.,
were recorded within the WRA. No mammals were recorded in the Survey Area in regular survey nor night search. A summary of the survey
findings is provided in
Appendix J.
During
the reporting period, pH of all Cells reached the Action Level. No measures are
proposed at the moment, but the condition will be monitored. Monitoring data are
presented in Appendix K.
All
sighted Red Fire Ant nests were treated with approved pesticide.
Ecological monitoring during July 2013 was carried out according to the
survey methodology and frequency outlined in the EM&A Manual.
Summary of survey findings is listed
as follows:
Table 4.1: Summary of Ecological Monitoring in WRA and Survey Area
|
Species |
Survey Area (excluding WRA) |
WRA |
|
Birds (total) |
25 |
19 |
|
Birds (of conservation
importance and/or wetland-dependence) |
11 |
11 |
|
Amphibians |
0 |
1 |
|
Reptiles |
0 |
0 |
|
Mammals |
0 |
1 |
|
Odonates |
6 |
10 |
|
Butterflies |
4 |
3 |
Survey
findings indicate that the ponds within the Survey Area supported numbers and
diversity of wetland-dependent birds typical of fish pond areas. The WRA continues to attract wetland
dependent fauna and serves as a buffer between the residential portion and the
fishponds in the north.
The EM&A programme for Landscape and
Visual impact due to the construction commenced in June 2010 and continued
during the reporting period. Site inspections on Landscape and Visual impact were
carried out on 12 July and 2 August 2013 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. 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 retained within
the site along the northeast boundary, beside wetland restoration area, have
been identified and protected by temporary protective fencing. |
|
Streams |
The works site is
partly encircled by a berm / perimeter channel 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 ponds have been provided to enable primary treatment before
discharge to mains drains. |
|
Clearance of
existing vegetation |
Site clearance was
completed prior to the commencement of construction. |
|
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 soil material which had been
excavated and stockpiled from the original site, has now been re-used within
the landscape works Dust suppression
measures are active along all 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 screen fence between
the future residential sites and the constructed wetland restoration areas
is complete. Fence has been 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.
Their 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 generally |
Continuous belt of screen planting along the
southern and western boundaries of the site has been completed. The formation, soiling and water control
structures of the wetland restoration area have been completed. The wetland areas
are being established, with the ponds are being seasonally filled with rain
water. Planting of areas around the
WRA cells is complete. No
construction was carried out at the wetland restoration area after 15
November 2010. |
|
Soiling, etc. |
The soiling for
the advance planting strip has been completed. The soil placement and grading for each of
the wetland restoration areas has been completed. |
|
Plant supply |
The plant material used in the Advance Planting
Strip and in the WRA are all commonly available species and came from
commercial sources. Transplanted reeds (Phragmites australis) at the wetland habitat
came from the temporary holding nursery onsite. |
|
Planting |
The total number of trees that will reach a minimum
of 10m in the advance planting strip meets the contract requirements. The tree species are all from the approved
list. This planting should achieve
the required screening effect within the required time period. Some of the trees that were identified as dead in
previous month or having defects (i.e. extensive bark damage, cavities,
fungal growths etc) still need to be replaced with
new specimens. Some of the recently planted trees are still in poor
condition, but are showing small signs of graduate improvement Seedling trees and
shrubs, have been established at the margins of the
wetland cells. Some additional fill-in planting has been undertaken. |
|
Establishment Works |
The advance
planting, the compensatory planting and transplanted trees are generally
being maintained by the landscape sub-contractor in accordance with the
specification to ensure that the contract requirements are met. Some of the taller trees (e.g. Eucalyptus sp.) that were partially blown over, or growing into
the noise barrier structure, have been set upright and supported with rope
cables and bamboo stakes, but many trees still need
to be rectified. Precautions should
be taken to prevent damage to the trees by the structure. Low coverage of
some areas of shrubs need to be rectified with further infill shrubs planting. Minor areas of shrubs have been cleared
and these need to be replaced. Pruning of tall
shrubs (e.g. Ligustrum sinensis)
needs to be undertaken regularly. Removal of extensive growth of weeds and invasive climbers in
the space behind screen noise barrier has been carried out, but clearance needs to
be undertaken on a monthly basis as they may be inhibiting the advance planting. Soil placed in the space
behind screen noise barrier has begun to wash down into the advance planting
area. Surface water erosion
protection of soiled areas is needed to prevent this. Phragmites australis reeds planted
along the water edge are growing profusely and are beginning to reduce the
extent of other vegetation types. Regular
horticultural maintenance (grass cutting, weeding, watering etc.) in the
shrubs and tree seedling areas around the WRA cells is being undertaken. The trees / shrubs
planted along the northern site boundary are showing seasonal insect
infestation again. Growth of shrubs / seedlings on the north
side of WRA1 is still unsatisfactory. Some of the trees from outside
the site which fell on top of trees in the advance planting strip, have been removed but no rectification of affected
trees has been undertaken. Trees T21 and T364 have lost their leader and are
no longer viable, so should be removed and
replaced. Severe bark damage on lower trunk of T333, extensive bark detachment
on T467, and profuse fungal growth on trunk of T292. Trees are
irreparably damaged / rotten and should be removed immediately. Branches broken on trees have been pruned away.
Workmanship of some pruning works did not comply with proper arboricultural
practice resulting in bark tearing. Broken branch noted on tree behind the
newly planted shrubs near WRA cell 4. Hanging branch on T266 and should be
removed immediately, likewise T20 and T419. Some of the tree tags are
too tight and need to be re-set, immediately. |
The ET had carried out construction phase
weekly site inspections on 2, 9, 19, 23 and 29 July 2013. 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) |
|
Some black liquid was observed on the ground near the vehicle wheel
wash. (23 Jul 13) |
The contractor was asked to remove and handle the liquid as chemical
waste. |
Agreed and followed
up |
Y (29 Jul 13) |
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, no C&D
material was generated on site during the period. 2 kg of metals was generated
and collected by registered recycling collector. 2 kg of paper/cardboard
packing and 8 kg of plastic were generated on site and collected by registered
recycling collector. No chemical waste was generated and collected by licensed
chemical waste collector. 60 kg of other types of
wastes (e.g. general refuse) was generated on site and disposed of at public
landfill facility.
The Contractor is advised to maintain the 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 reporting 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-311/2008/D |
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 L. In particular, the following mitigation
measures were brought to attention during the site audits:
Water Quality
·
Effluent should be discharged in accordance with the
discharge licence conditions;
·
Soil contaminated with chemicals/oils should be
removed from site and the voids should be created filled with suitable
materials;
·
Spillage or leakage of chemical waste should be
controlled by using suitable absorbent materials.
There is no breach of Action or Limit Levels
for Air Quality and Noise monitoring in the reporting month.
During July 2013,
Action Level exceedance of pH was observed at MP3,
MP5 and MP6, while exceedances of DO, turbidity
and/or SS were observed at MP3 to MP5 but not observed at MP6. DO exceedance was observed 12 times at MP3 and once at MP4. SS
and/or turbidity exceedance was recorded on four
monitoring dates at MP4 and one monitoring date at MP5 during 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) |
|
MP3 |
|
|
|
|
|
02/07/2013 |
7.3 |
5.4 |
33.4 |
24 |
|
04/07/2013 |
7.6 |
4.3 |
40.2 |
37 |
|
06/07/2013 |
7.5 |
4.1 |
19.2 |
15 |
|
08/07/2013 |
7.4 |
5.0 |
25.3 |
23 |
|
10/07/2013 |
7.4 |
5.3 |
35.9 |
36.5 |
|
12/07/2013 |
7.3 |
5.1 |
38.4 |
37.5 |
|
15/07/2013 |
7.3 |
4.1 |
57.2 |
33.5 |
|
17/07/2013 |
7.3 |
5.3 |
18.0 |
15 |
|
19/07/2013 |
7.3 |
7.0 |
38.0 |
29 |
|
22/07/2013 |
7.3 |
4.1 |
36.0 |
31 |
|
24/07/2013 |
7.3 |
3.7 |
31.1 |
26.5 |
|
26/07/2013 |
7.3 |
3.9 |
25.5 |
24.5 |
|
29/07/2013 |
7.6 |
7.5 |
19.1 |
14 |
|
31/07/2013 |
7.6 |
4.3 |
39.1 |
34.5 |
|
Action Level |
<5.5 or >7.5 |
<6.85 |
>64 |
>65 |
|
Limit
Level |
<4.0 or >8.0 |
<6.65 |
>67 |
>66 |
|
|
|
|
|
|
|
MP4 |
|
|
|
|
|
02/07/2013 |
7.4 |
4.3 |
41.9 |
20.5 |
|
04/07/2013 |
7.5 |
4.9 |
18.0 |
21 |
|
06/07/2013 |
7.5 |
5.7 |
17.7 |
19 |
|
08/07/2013 |
7.5 |
4.8 |
26.7 |
23.5 |
|
10/07/2013 |
7.5 |
6.2 |
54.6 |
56 |
|
12/07/2013 |
7.5 |
6.1 |
32.4 |
38 |
|
15/07/2013 |
7.5 |
6.4 |
59.1 |
67 |
|
17/07/2013 |
7.5 |
6.3 |
46.1 |
33.5 |
|
19/07/2013 |
7.4 |
4.8 |
60.7 |
54 |
|
22/07/2013 |
7.5 |
4.2 |
51.1 |
43 |
|
24/07/2013 |
7.5 |
4.2 |
43.1 |
43.5 |
|
26/07/2013 |
7.5 |
3.9 |
59.4 |
47.5 |
|
29/07/2013 |
7.5 |
4.4 |
25.0 |
20.5 |
|
31/07/2013 |
7.5 |
5.4 |
60.8 |
50 |
|
Action
Level |
<5.5 or >7.5 |
<3.91 |
>60 |
>50 |
|
Limit
Level |
<4.0 or >8.0 |
<3.82 |
>64 |
>53 |
|
|
|
|
|
|
|
MP5 |
|
|
|
|
|
02/07/2013 |
7.4 |
5.7 |
27.6 |
28.5 |
|
04/07/2013 |
7.4 |
7.8 |
21.3 |
28.5 |
|
06/07/2013 |
7.5 |
7.7 |
30.6 |
30 |
|
08/07/2013 |
7.5 |
10.5 |
26.4 |
36.5 |
|
10/07/2013 |
7.5 |
6.8 |
28.8 |
32 |
|
12/07/2013 |
7.6 |
6.9 |
26.5 |
34.5 |
|
15/07/2013 |
7.6 |
9.7 |
30.7 |
74.5 |
|
17/07/2013 |
7.6 |
7.2 |
53.3 |
52 |
|
19/07/2013 |
7.5 |
7.7 |
33.2 |
30 |
|
22/07/2013 |
7.6 |
5.3 |
33.9 |
27.5 |
|
24/07/2013 |
7.5 |
4.3 |
28.1 |
26 |
|
26/07/2013 |
7.6 |
6.1 |
80.2 |
51.5 |
|
29/07/2013 |
7.6 |
4.7 |
41.1 |
38.5 |
|
31/07/2013 |
7.6 |
7.1 |
59.3 |
54 |
|
Action Level |
<5.5 or >7.5 |
<4.13 |
>81 |
>66 |
|
Limit
Level |
<4.0 or >8.0 |
<3.87 |
>84 |
>69 |
|
|
|
|
|
|
|
MP6 |
|
|
|
|
|
02/07/2013 |
7.5 |
6.0 |
31.1 |
31 |
|
04/07/2013 |
7.4 |
7.7 |
32.6 |
46 |
|
06/07/2013 |
7.5 |
6.9 |
16.7 |
22.5 |
|
08/07/2013 |
7.5 |
10.6 |
20.0 |
19.5 |
|
10/07/2013 |
7.5 |
8.7 |
27.1 |
40 |
|
12/07/2013 |
7.6 |
8.6 |
23.9 |
32.5 |
|
15/07/2013 |
7.6 |
9.4 |
49.0 |
57 |
|
17/07/2013 |
7.6 |
6.2 |
62.5 |
65.5 |
|
19/07/2013 |
7.5 |
7.0 |
40.7 |
31 |
|
22/07/2013 |
7.6 |
5.6 |
31.9 |
22.5 |
|
24/07/2013 |
7.6 |
5.8 |
51.0 |
57.5 |
|
26/07/2013 |
7.6 |
6.1 |
86.9 |
74 |
|
29/07/2013 |
7.6 |
6.0 |
42.1 |
40.5 |
|
31/07/2013 |
7.6 |
6.7 |
43.5 |
40.5 |
|
Action Level |
<5.5 or >7.5 |
<4.61 |
>94 |
>75 |
|
Limit
Level |
<4.0 or >8.0 |
<4.52 |
>96 |
>75 |
Notes:
(1) Values Bold indicate Action Level exceedance.
(2) Values Underlined and Bold indicate
Limit Level exceedance.
No environmental complaint was received during the reporting month.
No notifications of summons or successful prosecution were received the reporting month.
Non-compliance
Investigations have been carried out to
identify the causes of water quality exceedance.
From investigation, construction activities during
the period of exceedance included mainly site
formation and foundation work, as well as pond drainage management in the
Wetland Restoration Area (to lower the water level and remove unwanted species
in the pond). 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 and installing a barrier at the discharge
outlet to desilt and divert site runoff to
sedimentation tanks and wastewater treatment facilities (Aquased),
which will ensure all site runoff is treated to
satisfactory quality before discharging into the northern ditches. With
external factors affecting the adjacent environments, such as natural
variations, pond fish culture activities, rainfall and suspected routine
dredging works (unrelated to the Project), the exceedances
were considered not due to Project construction works.
Complaints, Summons and Prosecutions
Not applicable for this reporting month.
Non-compliance
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 wet season, the
Contractor has further enhanced the water quality mitigation measures by
erecting several segments of rock bunds and installing a barrier at the discharge outlet to desilt
and divert site runoff to sedimentation tanks and wastewater treatment facilities
(Aquased), which will ensure all site runoff is
treated to satisfactory quality before discharging into the northern ditches.
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
(July 2013) |
0 |
0 |
0 |
|
From
12 May 2010 to end of the reporting month (July 2013) |
5 |
0 |
0 |
The major site works scheduled to be commissioned in the coming month include:
¡ Site Formation
¡ Foundation Work
¡ Superstructure
¡ Pond drainage management in the Wetland
Restoration Area (to lower the
water level and remove unwanted species in the pond)
Key issues to be considered in the coming month include:
¡ Generation of dust from activities on-site during
dry weather conditions;
¡ Noise impact from operating equipment and
machinery on-site;
¡ Generation and treatment of site surface
runoffs and wastewater from activities on-site and during wet weather conditions;
¡ 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 June 2013 is shown in the Table 8.1.
Table 8.1: Tentative
Environmental Monitoring and Audit Schedule for August 2013

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.
During July 2013, Action/Limit Level exceedances of pH, DO, turbidity and/or SS were observed at
MP3 to MP6. Investigations
have been carried out to identify the causes of exceedance.
From investigation, the Contractor has implemented water quality mitigation
measures as recommended in the EIA report. With external factors
affecting the adjacent environments, such as natural variations, pond fish
culture activities, rainfall and suspected routine dredging works (unrelated to
the Project), the exceedances were considered not due
to construction works.
With considerations
on the construction activities and environment, the following recommendations
were provided:
Water
Quality
·
Effluent should be discharged in accordance with the
discharge licence conditions;
·
Soil contaminated with chemicals/oils should be
removed from site and the voids should be created filled with suitable
materials;
·
Spillage or leakage of chemical waste should be
controlled by using suitable absorbent materials.

Contact
information:
|
Company |
Position |
Name |
Telephone |
|
Heng Shung
Construction Co. Ltd. |
Assistant Construction
Manager |
Ms Lynne HUNG |
2908 2391 |
|
(The Contractor) |
Site Agent |
Mr MOK Wing Hong |
9866 7683 |
|
|
Environmental Officer |
Mr Ricky WONG |
9866 7625 |
|
ENVIRON Hong
Kong Ltd. (Independent
Environmental Checker (IEC)) |
Independent Environmental
Checker |
Mr David YEUNG |
3465 2888 |
|
Mott MacDonald Hong Kong Ltd. (Environmental
Team (ET)) |
Environmental Team Leader |
Mr Terence KONG |
2828 5919 |
Appendix C. Action
and Limit Levels for Construction Phase
|
Air
Quality
Action
and Limit Levels for 24-hour TSP
|
Monitoring Station |
Action Level (mg/m3) |
Limit Level (mg/m3) |
|
ASR1 |
226 |
260 |
|
ASR2A |
213 |
260 |
|
ASR3 |
205 |
260 |
|
ASR4 |
237 |
260 |
Action and Limit Levels for 1-hour TSP
|
Monitoring Station |
Action Level (mg/m3) |
Limit Level (mg/m3) |
|
ASR1 |
378 |
500 |
|
ASR2A |
357 |
500 |
|
ASR3 |
358 |
500 |
|
ASR4 |
372 |
500 |
Noise
Action and Limit Levels for
Construction Noise
|
Time Period |
Action Level |
Limit Level |
|
NSR1, NSR3, NSR5, NSR7 |
||
|
0700 – 1900 hours on
normal weekdays |
When one documented
complaint is received from any one of the sensitive receivers |
75 dB(A) |
Water Quality
Action and Limit
Levels for Water Quality
|
Parameters |
DO in mg/L |
Turbidity in NTU |
SS in
mg/L |
pH |
||||
|
|
Action Level |
Limit Level |
Action Level |
Limit Level |
Action Level |
Limit Level |
Action Level |
Limit Level |
|
MP1 |
1.23 |
1.17 |
173 |
177 |
231 |
299 |
< 5.5 or > 7.5 |
< 4.0 or > 8.0 |
|
MP2 |
1.04 |
0.89 |
132 |
163 |
170 |
209 |
||
|
MP3 |
6.85 |
6.65 |
64 |
67 |
65 |
66 |
||
|
MP4 |
3.91 |
3.82 |
60 |
64 |
50 |
53 |
||
|
MP5 |
4.13 |
3.87 |
81 |
84 |
66 |
69 |
||
|
MP6 |
4.61 |
4.52 |
94 |
96 |
75 |
75 |
||
Appendix D. Event and Action Plan for Air Quality, Noise,
Water Quality, Ecology and Landscape & Visual
|
Air Quality
|
Event |
Action |
|||
|
ET
Leader |
IEC |
ER |
Contractor |
|
|
Action
Level |
|
|
|
|
|
1. Exceedance for one sample |
1.
Identify source, investigate the causes of exceedance and propose remedial measures. 2.
Inform IEC and ER. 3.
Repeat measurement to confirm finding. 4.
Increase monitoring frequency to daily. |
1.
Check monitoring data submitted by ET. 2.
Check Contractor’s working method. |
1.
Notify Contractor. |
1.
Rectify any unacceptable practice. 2.
Amend working methods if appropriate. |
|
2. Exceedance for two or more consecutive samples |
1.
Identify the source. 2.
Inform IEC and ER. 3.
Advise ER on the
effectiveness of the proposed remedial measures 4.
Repeat measurements to confirm findings. 5.
Increase monitoring frequency to daily. 6.
Discuss with IEC and the Contractor on remedial actions
required. 7.
If exceedance continues, arrange
meeting with IEC and ER. 8.
If exceedance stops, cease additional monitoring. |
1.
Check monitoring data submitted by ET. 2.
Check the Contractor’s working method. 3.
Discuss with ET Leader and the Contractor on possible remedial
measures. 4.
Advise ER on the effectiveness of the proposed remedial
measures. 5.
Supervise implementation of remedial measures. |
1.
Confirm receipt of notification of exceedance
in writing. 2.
Notify the Contractor. 3.
Ensure remedial measures properly implemented. |
1.
Submit proposals for remedial actions to IEC within 3 working
days of notification. 2.
Implement the agreed proposals. 3.
Amend proposal if appropriate. |
|
Limit Level |
|
|
|
|
|
1. Exceedance for one sample |
1.
Identify source, investigate the causes of exceedance
and propose remedial measures. 2.
Inform ER and EPD. 3.
Repeat measurement to confirm finding. 4.
Increase monitoring frequency to daily. 5.
Assess effectiveness of Contractor’s remedial actions and keep
IEC, EPD and ER informed of the results. |
1.
Check monitoring data submitted by ET. 2.
Check the Contractor’s working method. 3.
Discuss with ET Leader and the Contractor on possible remedial
measures. 4.
Advise ER on the effectiveness of the proposed remedial
measures. 5.
Supervise implementation of remedial measures. |
1.
Confirm receipt of notification of exceedance
in writing. 2.
Notify the Contractor. 3.
Ensure remedial measures properly implemented. |
1.
Take immediate action to avoid further exceedance. 2.
Submit proposals for remedial actions to IEC within 3 working
days of notification. 3.
Implement the agreed proposals. 4.
Amend proposal if appropriate. |
|
2. Exceedance for two or more consecutive samples |
1.
Notify IEC, ER, EPD and the Contractor. 2.
Identify the source. 3.
Repeat measurements to confirm findings. 4.
Increase monitoring frequency to daily. 5.
Carry out analysis of the Contractor’s working procedures to
determine possible mitigation to be implemented. 6.
Arrange meeting IEC and ER to discuss the remedial actions to be
taken. 7.
Assess effectiveness of the Contractor’s remedial actions and
keep IEC, EPD and ER informed of the results. 8.
If exceedance stops, cease additional
monitoring. |
1.
Discuss amongst ER, ET Leader and the Contractor on the
potential remedial actions. 2.
Review the Contractor’s remedial actions whenever necessary and
advise ER accordingly. 3.
Supervise the implementation of remedial measures. |
1.
Confirm receipt of notification of exceedance
in writing. 2.
Notify the Contractor. 3.
In consultation with IEC, agree with the remedial measures to be
implemented. 4.
Ensure remedial measures are properly implemented. 5.
If exceedance continues, consider what
activity of the work is responsible and instruct the Contractor to stop that
activity of work until the exceedance is abated. |
1.
Take immediate action to avoid further exceedance. 2.
Submit proposals for remedial actions to IEC within 3 working
days of notification. 3.
Implement the agreed proposals. 4.
Resubmit proposals if problem still not under control. 5.
Stop the relevant activity of works as determined by ER until
the exceedance is abated. |
Construction Noise
|
Event |
Action |
|||
|
ET Leader |
IEC |
ER |
Contractor |
|
|
Action Level |
1.
Notify
IEC and the Contractor. 2.
Carry
out investigation. 3.
Report
the results of investigation to IEC and the Contractor. 4.
Discuss
with the Contractor and formulate remedial measures. 5.
Increase
monitoring frequency to check mitigation measures. |
1.
Review
with analysed results submitted by ET. 2.
Review
the proposed remedial measures by the Contractor and advise ER accordingly. 3.
Supervise
the implement of remedial measures. |
1.
Confirm
receipt of notification of exceedance in writing. 2.
Notify
the Contractor. 3.
Require
the Contractor to propose remedial measures for the analysed
noise problem. 4.
Ensure
remedial measures are properly implemented. |
1.
Submit
noise mitigation proposals to IEC. 2.
Implement
noise mitigation proposals. |
|
Limit Level |
1.
Identify
the source. 2.
Notify
IEC, ER, EPD and the Contractor. 3.
Repeat
measurement to confirm findings. 4.
Increase
monitoring frequency. 5.
Carry
out analysis of Contractor’s working procedures to determine possible
mitigation to be implemented. 6.
Inform
IEC, ER, and EPD the causes & actions taken for the exceedances. 7.
Assess
effectiveness of the Contractor’s remedial actions and keep IEC, EPD and ER
informed of the results. 8.
If exceedance stops, cease additional monitoring. |
1.
Discuss
amongst ER, ET Leader and the Contractor on the potential remedial actions. 2.
Review
the Contractor’s remedial actions whenever necessary to assure their effectiveness
and advise ER accordingly. 3.
Supervise
the implementation of remedial measures. |
1.
Confirm
receipt of notification of exceedance in writing. 2.
Notify
the Contractor. 3.
Require
the Contractor to propose remedial measures for the analysed
noise problem. 4.
Ensure remedial
measures are properly implemented. 5.
If exceedance continues, consider what activity of the work
is responsible and instruct the Contractor to stop that activity of work
until the exceedance is abated. |
1.
Take
immediate action to avoid further exceedance. 2.
Submit
proposals for remedial actions to IEC within 3 working days of notification. 3.
Implement
the agreed proposals. 4.
Resubmit
proposals if problem still not under control. 5.
Stop
the relevant activity of works as determined by the ER until the exceedance is abated. |
Water Quality
|
Event |
Action |
|||
|
ET
Leader |
IEC |
ER |
Contractor |
|
|
Action
Level |
|
|
|
|
|
1. Exceedance for one sample |
1. Repeat in-situ measurement to confirm
finding; 2. Identify source(s) of impact; 3. Inform IEC and Contractor; 4. Check monitoring data, all plant, equipment
and Contractor’s working methods; 5. Discuss mitigation measures with IEC and
Contractor; and 6. Repeat measurement on next day of exceedance. |
1. Discuss with ET and Contractor on the
mitigation measures; 2. Review proposals on mitigation measures
submitted by Contractor and advise the ER accordingly; and 3. Assess the effectiveness of the implemented
mitigation measures. |
1. Discuss with IEC on the proposed mitigation
measures; and 2. Make agreement on the mitigation measures
to be implemented. |
1. Inform the ER and confirm notification of
the non-compliance in writing; 2. Rectify unacceptable practice; 3. Check all plant and equipment; 4. Consider changes of working methods; 5. Discuss with ET and IEC and propose
mitigation measures to IEC and ER; and 6. Implement the agreed mitigation measures. |
|
2.
Exceedance for two
or more consecutive samples |
1. Repeat in-situ measurement to confirm
finding; 2. Identify source(s) of impact; 3. Inform IEC and Contractor; 4. Check monitoring data, all plant, equipment
and Contractor’s working methods; 5. Discuss mitigation measures with IEC and
Contractor; 6. Ensure mitigation measures are implemented; 7. Prepare to increase the monitoring
frequency to daily; and 8. Repeat measurement on next day of exceedance. |
1. Discuss with ET and Contractor on the
mitigation measures; 2. Review proposals on mitigation measures
submitted by Contractor and advise the ER accordingly; and 3. Assess the effectiveness of the implemented
mitigation measures. |
1. Discuss with IEC on the proposed mitigation
measures; 2. Make agreement on the mitigation measures
to be implemented; and 3. Assess the effectiveness of the implemented
mitigation measures. |
1. Inform the Engineer and confirm
notification of the non-compliance in writing; 2. Rectify unacceptable practice; 3. Check all plant and equipment; 4. Consider changes of working methods; 5. Discuss with ET and IEC and propose
mitigation measures to IEC and ER within 3 working days; and 6. Implement the agreed mitigation measures. |
|
Limit Level |
|
|
|
|
|
1.
Exceedance for one
sample |
1. Repeat in-situ measurement to confirm
finding; 2. Identify source(s) of impact; 3. Inform IEC, Contractor and EPD; 4. Check monitoring data, all plant, equipment
and Contractor’s working methods; 5. Discuss mitigation measures with IEC, ER
and Contractor; 6. Ensure mitigation measures are implemented;
and 7. Increase the monitoring frequency to daily
until no exceedance of Limit level. |
1. Discuss with ET and Contractor on the
mitigation measures; 2. Review proposals on mitigation measures
submitted by Contractor and advise the ER accordingly; and 3. Assess the effectiveness of the implemented
mitigation measures. |
1. Discuss with IEC, ET and Contractor on the
proposed mitigation measures; and 2. Request Contractor to critically review the
working methods; 3. Make agreement on the mitigation measures
to be implemented; and 4. Assess the effectiveness of the implemented
mitigation measures. |
1. Inform the Engineer and confirm
notification of the non-compliance in writing; 2. Rectify unacceptable practice; 3. Check all plant and equipment; 4. Consider changes of working methods; 5. Discuss with ET and IEC and ER and propose
mitigation measures to IEC and ER within 3 working days; and 6. Implement the agreed mitigation measures. |
|
2.
Exceedance for two
or more consecutive samples |
1. Repeat in-situ measurement to confirm
finding; 2. Identify source(s) of impact; 3. Inform IEC, Contractor and EPD; 4. Check monitoring data, all plant, equipment
and Contractor’s working methods; 5. Discuss mitigation measures with IEC, ER
and Contractor; 6. Ensure mitigation measures are implemented;
and 7. Increase the monitoring frequency to daily
until no exceedance of Limit level for two
consecutive days. |
1. Discuss with ET and Contractor on the
mitigation measures; 2. Review proposals on mitigation measures
submitted by Contractor and advise the ER accordingly; and 3. Assess the effectiveness of the implemented
mitigation measures. |
1. Discuss with IEC, ET and Contractor on the
proposed mitigation measures; and 2. Request Contractor to critically review the
working methods; 3. Make agreement on the mitigation measures
to be implemented; 4. Assess the effectiveness of the implemented
mitigation measures; and 5. Consider and instruct, if necessary, the
Contractor to slow down or to stop all or part of the marine work until no exceedance of Limit Level. |
1. Inform the ER and confirm notification of
the non-compliance in writing; 2. Rectify unacceptable practice; 3. Check all plant and equipment; 4. Consider changes of working methods; 5. Discuss with ET and IEC and ER and propose
mitigation measures to IEC and ER within 3 working days; 6. Implement the agreed mitigation measures;
and 7. As directed by the Engineer, to slow down or
to stop all or part of the marine work or construction activities. |
Appendix E. Calibration certificates
|
Appendix F. Graphical plots of the
monitoring results
|
Appendix G. Weather conditions
during the monitoring period
|
Appendix H.
Ecological Monitoring conducted
|
|
July 2013 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
|
Mammals |
|
|
ü |
|
|
|
|
|
ü |
|
|
|
|
|
|
|
Birds |
|
|
ü |
|
|
|
|
|
ü |
|
|
|
|
|
|
|
Herpetofauna |
|
|
ü |
|
|
|
|
|
ü |
|
|
|
|
|
|
|
Dragonflies &
butterflies |
|
|
|
|
|
|
|
|
ü |
|
|
|
|
|
|
|
Water Quality |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Inspection Visits |
|
|
ü |
|
ü |
|
|
|
ü |
|
|
ü |
|
|
|
|
July 2013 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
26 |
27 |
28 |
29 |
30 |
31 |
|
Mammals |
ü |
|
|
|
|
|
|
ü |
|
|
|
|
|
|
ü |
|
|
Birds |
ü |
|
|
|
|
|
|
ü |
|
|
|
|
|
|
ü |
|
|
Herpetofauna |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Dragonflies &
butterflies |
|
|
|
|
|
|
|
ü |
|
|
|
|
|
|
|
|
|
Water Quality |
|
|
|
|
|
|
ü |
|
|
|
|
|
|
|
|
|
|
Inspection Visits |
ü |
|
|
|
|
|
|
ü |
|
|
ü |
|
|
|
ü |
|
Note: Light
grey cells indicate public holidays, Saturdays or Sundays.
.
Appendix I.
Summary of Bird Surveys conducted
|
Table
I1. Summary of bird species of
conservation importance and/or wetland-dependence recorded in the Survey Area
(excluding the WRA)
|
Species Name(5) |
Scientific Name(5) |
Conservation Status (2) |
July 2013 |
|
|
Occurrence(3) |
Mean(4) |
|||
|
Little Grebe |
Tachybaptus ruficollis |
LC, (1) |
4 |
3.8 |
|
Great Egret |
Egretta alba |
PRC,
(RC), (1) |
5 |
12.4 |
|
Little Egret |
Egretta garzetta |
PRC,
(RC), (1) |
5 |
10.0 |
|
Chinese Pond Heron |
Ardeola bacchus |
PRC,
(RC), (1) |
5 |
10.6 |
|
Black-crowned Night Heron |
Nycticorax nycticorax |
(LC),
(1) |
5 |
3.0 |
|
White-breasted Waterhen |
Amaurornis phoenicurus |
(1) |
3 |
1.6 |
|
White-throated Kingfisher |
Halcyon
smyrnensis |
LC, (1) |
1 |
0.4 |
|
Common Kingfisher |
Alcedo atthis |
(1) |
4 |
1.2 |
|
White Wagtail |
Motacilla alba |
(1) |
3 |
2.2 |
|
White-shouldered
Starling |
Sturnus sinensis |
(LC),
(1) |
2 |
0.6 |
|
Collared Crow |
Corvus torquatus |
LC, (1) |
1 |
0.6 |
|
No. of
Species Recorded |
11 |
|||
(1) Indicates wetland-dependant or wetland-associated species.
(2) Conservation status follows that of Fellowes et al. (2002) and BirdLife International listing (2011).
(3) Indicates number of surveys recorded within the reporting period.
(4) Refers to the mean number of individuals recorded in the reporting period (excluding the WRA)
(5) Follows HK bird list (dated 2013-2-25).
Table I2. Summary of bird species of conservation importance and/or
wetland-dependence recorded in the WRA
|
Species Name(5) |
Scientific
Name(5) |
Conservation Status (2) |
July 2013 |
Records Outside Surveys |
|
|
Occurrence(3) |
Mean(4) |
||||
|
Great
Egret |
Egretta alba |
PRC,
(RC), (1) |
2 |
0.6 |
ü |
|
Little Egret |
Egretta garzetta |
PRC,
(RC), (1) |
2 |
0.4 |
ü |
|
Chinese Pond Heron |
Ardeola bacchus |
PRC,
(RC), (1) |
3 |
0.8 |
|
|
Yellow Bittern |
Ixobrychus sinensis |
LC, (1) |
1 |
0.2 |
ü |
|
White-breasted Waterhen |
Amaurornis phoenicurus |
(1) |
1 |
0.2 |
ü |
|
Black-winged Stilt |
Himantopus himantopus |
(RC),
(1) |
1 |
0.2 |
|
|
Kentish Plover |
Charadrius alexandrinus |
(RC),
(1) |
1 |
0.8 |
|
|
Common Sandpiper |
Actitis hypoleucos |
(1) |
- |
- |
ü |
|
Common Kingfisher |
Alcedo atthis |
(1) |
2 |
0.4 |
ü |
|
White Wagtail |
Motacilla alba |
(1) |
3 |
1.2 |
|
|
White-shouldered Starling |
Sturnus sinensis |
(LC),
(1) |
1 |
0.2 |
|
|
No. of
Species Recorded |
11 |
||||
(1) Indicates wetland-dependant or
wetland-associated species.
(2) Conservation status follows that of Fellowes et al. (2002) and BirdLife
International listing (2011).
(3) Indicates number of surveys recorded within
the reporting period.
(4) Refers to the mean number of individuals
recorded in the reporting period at WRA.
(5) Follows HK bird list (dated 2013-02-25).
Table J1. Summary of herpetofauna
monitoring in the Survey Area (excluding the WRA)
|
Species Name |
Scientific Name |
Conservation Status(1) |
July 2013 |
|
|
Occurrence(2) |
Mean(3) |
|||
|
Amphibian |
No. of |
Species Recorded |
0 |
|
|
(No records in July 2013) |
|
|
|
|
|
|
|
|
Occurrence(2) |
Mean(3) |
|
Reptile |
No. of |
Species Recorded |
0 |
|
|
(No records in July 2013) |
|
|
|
|
(1) Conservation status follows that of Fellowes et al. (2002), Chan et al. (2005) and Karsen et al. (1998).
(2) Indicates number of surveys recorded within the reporting period.
(3) Refers to the mean number of individuals recorded in the
reporting period (excluding the WRA).
Table J2. Summary of herpetofauna
monitoring in the WRA
|
Species Name |
Scientific Name |
Conservation Status(1) |
July 2013 |
||||
|
Occurrence(2) |
Mean(3) |
||||||
|
Amphibian |
No. of |
Species Recorded |
1 |
||||
|
Asian Common Toad |
Bufo melanostictus |
- |
1 |
1 |
|||
|
|
|
|
Occurrence(2) |
Mean(3) |
|||
|
Reptiles |
No. of |
Species Recorded |
0 |
||||
|
(No
records in July 2013) |
|
|
|
|
|||
(1) Conservation status follows that of Fellowes et al. (2002), Chan et al. (2005) and Karsen et al. (1998).
(2) Indicates number of surveys recorded within the reporting period.
(3) Refers to the mean number of individuals recorded in the
reporting period in the WRA.
Table J3. Summary of mammal monitoring in the Survey Area (excluding the WRA)
|
Species Name |
Scientific Name |
Conservation Status(1) |
July 2013 |
|
|
|
|
|
Occurrence(2) |
Mean(3) |
|
Mammal |
No. of |
Species Recorded |
0 |
|
|
(No records in July 2013) |
|
|
|
|
(1) Conservation status follows that of Fellowes et al. (2002) and Shek (2006).
(2) Indicates number of surveys recorded within the reporting period.
(3) Refers to the mean number of individuals recorded in the
reporting period (excluding the WRA).
Table J4. Summary of mammal monitoring in
the WRA
|
Species
Name |
Scientific Name |
Conservation Status(1) |
July 2013 |
Records Outside Surveys |
|
|
|
|
|
Occurrence(2) |
Mean(3) |
|
|
Mammal |
No. of |
Species Recorded |
1 |
|
|
|
Pipistrelle |
Pipistrellus sp. |
- |
- |
- |
ü |
(1) Conservation status follows that of Fellowes et al. (2002) and Shek (2006).
(2) Indicates number of surveys recorded within the reporting period.
(3) Refers to the mean number of individuals recorded in the
reporting period in the WRA.
Table J5. Summary
of odonate and butterfly monitoring in the Survey
Area (excluding WRA)
|
Common Name |
Scientific Name |
Conservation Status(1) |
July 2013 |
|
|
Occurrence(2) |
Mean(3) |
|||
|
Odonate |
No. of
Species Recorded |
6 |
||
|
Common Flangetail |
Ictinogomphus pertinax |
- |
2 |
2.5 |
|
Crimson Dropwing |
Trithemis aurora |
- |
1 |
0.5 |
|
Green Skimmer |
Orthetrum sabina sabina |
- |
2 |
3.5 |
|
Variegated Flutterer |
Rhyothemis variegata arria |
- |
2 |
8.0 |
|
Wandering Glider |
Pantala flavescens |
- |
1 |
1.5 |
|
Common Flangetail |
Ictinogomphus pertinax |
- |
2 |
2.5 |
|
Butterfly |
No. of
Species Recorded |
4 |
||
|
Common Grass Yellow |
Eurema hecabe |
- |
1 |
1.0 |
|
Indian Cabbage White |
Pieris canidia canidia |
- |
1 |
0.5 |
|
Mottled Emigrant |
Catopsilia pyranthe pyranthe |
- |
2 |
2.0 |
|
Common Grass Yellow |
Eurema hecabe |
- |
1 |
1.0 |
(1) Conservation status follows that of Fellowes et al. (2002), Lo & Hui (2004), Tam et al. (2011) and Young & Yiu (2002).
(2) Indicates number of surveys recorded within the reporting period.
(3) Refers to the mean number of individuals recorded in the survey (excluding the WRA).
Table J6. Summary of dragonfly and butterfly
monitoring in the WRA
|
Common Name |
Scientific Name |
Conservation Status(1) |
July 2013 |
|
|
Occurrence(2) |
Mean(3) |
|||
|
Odonate |
No. of Species Recorded |
10 |
||
|
Asian Amberwing |
Brachythemis contaminata
|
- |
2 |
3.0 |
|
Blue Dasher |
Brachydiplax chalybea flavovittata |
- |
1 |
1.0 |
|
Common Bluetail |
Ischnura senegalensis |
- |
2 |
16.5 |
|
Common Flangetail |
Ictinogomphus pertinax |
- |
2 |
7.5 |
|
Green Skimmer |
Orthetrum sabina sabina |
- |
2 |
13.5 |
|
Lesser Emperor |
Anax parthenope
julius |
- |
1 |
1.0 |
|
Pied Percher |
Neurothemis tullia tullia |
- |
1 |
1.5 |
|
Saddlebag Glider |
Tramea virginia |
- |
2 |
6.0 |
|
Variegated Flutterer |
Rhyothemis variegata arria |
- |
2 |
29.0 |
|
Wandering Glider |
Pantala flavescens |
- |
1 |
0.5 |
|
Butterfly |
No. of Species Recorded |
3 |
||
|
Common Grass Yellow |
Eurema hecabe |
- |
1 |
2.5 |
|
Common Sailer |
Neptis hylas hylas |
- |
0 |
0.5 |
|
Mottled Emigrant |
Catopsilia pyranthe |
- |
1 |
0.5 |
(1) Conservation status follows that of Fellowes et al. (2002), Lo & Hui (2004), Tam et al. (2011) and Young & Yiu (2002).
(2) Indicates number of surveys recorded within the reporting period.
(3) Refers to the mean number of individuals
recorded in the reporting period in the WRA.
Table K1. Water quality at WRA in July 2013
|
Cell No. |
Temp. (°C) |
pH |
Salinity (ppt) |
Turb (mg/L) |
DO (mg/L) |
Water Level (cm) |
|
1 |
29.4 |
8.01 |
0.60 |
26.5 |
5.8 |
190 |
|
2 |
30.4 |
8.11 |
0.47 |
12.2 |
6.2 |
180 |
|
3 |
30.1 |
8.05 |
0.47 |
10.4 |
5.9 |
220 |
|
4 |
30.6 |
8.18 |
0.64 |
11.9 |
6.5 |
200 |
Note: Values highlighted in bold indicate that
action level is reached; whereas values in bold and underline indicate that
limit level is reached.